WO2019151500A1

WO2019151500A1 - Diaphragm valve

Info

Publication number: WO2019151500A1
Application number: PCT/JP2019/003703
Authority: WO
Inventors: 理彩子土田; 絢香齋藤
Original assignee: 積水化学工業株式会社
Priority date: 2018-02-01
Filing date: 2019-02-01
Publication date: 2019-08-08
Also published as: KR20200070365A; JPWO2019151500A1; CN111656067A; TW201937090A

Abstract

In this diaphragm valve (10), a contact part (33a) includes a first body-side curved section (71) and a second body-side curved section (72) which are curved so as to be recessed toward an opening section (31a) side in a plane perpendicular to the circulation direction X of a flow path (24). A compressor (61) has a first pressing-side curved section (81) and a second pressing-side curved section (82) which are curved so as to protrude toward the contact section (33a) side in the plane perpendicular to the circulation direction X. In a state in which a diaphragm (12) is pressed onto the contact part (33a) by the compressor (61), the first body-side curved section (71) faces the first pressing-side curved section (81) and the center (71a) of the curvature of the first body-side curved section (71) matches the center (81a) of the curvature of the first pressing-side curved section (81). The second body-side curved section (72) faces the second pressing-side curved section (82) and the center (72a) of the curvature of the second body-side curved section (72) matches the center (82a) of the curvature of the second pressing-side curved section (82).

Description

Diaphragm valve

The present invention relates to a diaphragm valve.

A diaphragm valve is provided in a piping line in a plant such as water treatment, chemistry, and food, and the fluid flowing through the piping is controlled by the diaphragm valve.

The diaphragm valve is installed in the plant with pipes connected at both ends. In the diaphragm valve, the flow path is closed when the diaphragm is pressed against the curved surface portion of the partition wall, and the flow path is opened when the diaphragm is separated from the partition wall (for example, Patent Documents). 1 (see FIG. 2).

JP 2007-278308 A

However, in the diaphragm valve shown in Patent Document 1, a portion where stress is concentrated on the curved surface portion occurs due to the shape of the curved surface portion of the compressor and the partition wall, and the force is not successfully transmitted from the compressor to the diaphragm. There was a case where leakage occurred.

An object of the present invention is to provide a diaphragm valve capable of improving the water stop performance in consideration of the above-described conventional problems.

(Means for solving the problem)
In order to achieve the above object, a diaphragm valve according to a first aspect of the present invention includes a valve main body, a valve portion, a pressing portion, and a drive portion. The valve body has a flow path, an opening, and a contact portion. The flow path is formed inside. The opening is formed in the middle of the flow path. The contact portion is provided at a position corresponding to the opening of the flow path. The contact portion includes a first main body side curved portion and a second main body side curved portion that are concavely curved toward the opening in a plane perpendicular to the flow direction of the flow path. The valve portion is disposed so as to close the opening, and can close the flow path by contacting the contact portion. The pressing portion has a first pressing side bending portion and a second pressing side bending portion that are convexly curved toward the contact portion on a plane perpendicular to the flow direction, and presses the valve portion against the contact portion. The drive unit drives the pressing unit to press the valve unit against the contact unit or to move away from the contact unit. In a state where the valve portion is pressed against the contact portion by the pressing portion, the first main body side bending portion faces the first pressing side bending portion, and the center of bending of the first main body side bending portion is the first pressing side bending. The second main body side bending portion faces the second pressing side bending portion, and the second main body side bending portion matches the bending center of the second pressing side bending portion. To do.

The center of the curved portion formed on the pressing portion and the center of the corresponding curved portion formed on the abutting portion coincide with each other in a state where the valve portion is pressed against the abutting portion by the pressing portion. Generation | occurrence | production of the stress concentration location in a contact part can be suppressed.

For this reason, force can be transmitted successfully from the pressing portion to the valve portion, and the water stop performance can be improved.
A diaphragm valve according to a second aspect is the diaphragm valve according to the first aspect, wherein the first main body side bending portion and the second main body side bending portion have the same main body side radius, and the first pressing side. The bending portion and the second pressing side bending portion have the same pressing side radius. When the main body side radius is R ₁ and the pressing side radius is r ₁ , 0.2r ₁ <R ₁ <10r ₁ is satisfied.

This makes it possible to ensure a water stop pressure of a predetermined level or more and improve water stop performance.

A diaphragm valve according to a third aspect is the diaphragm valve according to the first or second aspect, wherein the first main body side bending portion and the second main body side bending portion are symmetrical with respect to the center in the width direction of the flow path. Is formed.

This makes it easy to create the valve body due to the symmetrical shape, and can improve the water stop performance.

A diaphragm valve according to a fourth aspect is the diaphragm valve according to any one of the first to third aspects, wherein the first main body side bending portion and the second main body side bending portion are connected at the center in the width direction of the flow path. ing.

Thus, water stop performance can be improved by connecting between two curved parts.
A diaphragm valve according to a fifth invention is the diaphragm valve according to any one of the first to fourth inventions, wherein the contact portion is concavely curved toward the opening in a plane perpendicular to the flow direction of the flow path. The third main body side bending portion and the fourth main body side bending portion are provided. The third main body side bending portion is disposed closer to the end side in the width direction than the first main body side bending portion. The fourth main body side bending portion is disposed closer to the end side in the width direction than the second main body side bending portion. The pressing portion includes a third pressing side bending portion and a fourth pressing side bending portion that are curved in a convex shape toward the contact portion side in a plane perpendicular to the flow direction. The 3rd press side curved part is arranged on the end side of the width direction rather than the 1st press side curved part. The 4th press side curved part is arranged in the end side of the width direction rather than the 2nd press side curved part. In a state where the valve portion is pressed against the contact portion by the pressing portion, the third main body side bending portion faces the third pressing side bending portion, and the center of bending of the third main body side bending portion is the third pressing side bending. The fourth body-side bending portion faces the fourth pressing-side bending portion, and the fourth body-side bending portion matches the bending center of the fourth pressing-side bending portion. To do.

Thus, the water stop performance can be improved by having four curved portions in both the pressing portion and the contact portion.

A diaphragm valve according to a sixth aspect of the present invention is the diaphragm valve according to any one of the first to fifth aspects, wherein the drive unit is a manual type, an air drive type, or an electric drive type.

It can be driven manually, by air or electricity in this way, and the flow path can be closed or opened.

(Effect of the invention)
ADVANTAGE OF THE INVENTION According to this invention, it can provide providing the diaphragm valve which can improve water stop performance.

The perspective view of the diaphragm valve using the flow-path structure of embodiment concerning this invention. The fragmentary sectional view of the diaphragm valve of FIG. The perspective view which looked at the valve main body of FIG. 1 from upper direction. The perspective view which looked at the valve main body of FIG. 1 from the downward direction. The front view of the valve main body of FIG. The bottom view of the valve main body of FIG. FIG. 8 is a cross-sectional view taken along the line AA ′ in FIG. 7. Sectional drawing perpendicular | vertical with respect to the distribution direction of the flow path of the diaphragm valve of FIG. The bottom view of the compressor of FIG. (A) The schematic cross section which shows the state where the flow path was closed, (b) The schematic cross section which shows the state where the flow path was open | released. The figure for demonstrating the shape of the compressor and contact part of the diaphragm valve of FIG. The figure for demonstrating the shape of the compressor and contact part of the diaphragm valve of FIG. The figure for demonstrating the shape of the compressor and contact part of the diaphragm valve of Embodiment 2 concerning this invention. The figure for demonstrating the shape of the compressor and contact part of the diaphragm valve of Embodiment 2 concerning this invention. The figure which shows the result of having performed stress analysis about Example 1 and the comparative example 1, and having performed the water stop pressure evaluation. The figure for demonstrating the shape of the compressor and contact part in the comparative example 1. FIG. The figure which shows the result of having performed stress analysis about Example 1, 2 and Comparative Examples 2 and 3, and having performed the water stop pressure evaluation. The figure for demonstrating the shape of the compressor and contact part in the comparative example 2. FIG. The figure for demonstrating the shape of the compressor and contact part in the comparative example 3. FIG. The figure which shows the result of having performed stress analysis about Examples 3-9 and Comparative Examples 4 and 5, and having evaluated the water stop pressure.

Hereinafter, the diaphragm valve 10 in the embodiment using the valve flange according to the present invention will be described.

(Embodiment 1)
<1. Structure>
(1-1. Outline of diaphragm valve)
FIG. 1 is an external perspective view of a diaphragm valve 10 according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional configuration diagram of the diaphragm valve 10 of the present embodiment.

As shown in FIGS. 1 and 2, the diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12, a bonnet 13, and a drive mechanism 14. Pipes are connected to both ends of the valve body 11, and a flow path 24 through which a fluid flows is formed in the valve body 11. The diaphragm 12 opens or blocks the flow path 24. The bonnet 13 is attached to the valve body 11 so as to cover the diaphragm 12. A part of the driving mechanism 14 is disposed in the hood 13 and drives the diaphragm 12.

(1-2. Valve body 11)
FIG. 3 is a perspective view of the valve body 11 as viewed from the first surface 31 side to be described later. FIG. 4 is a perspective view of the valve body 11 as viewed from the second surface 32 side described later. FIG. 5 is a front view of the valve body 11, and FIG. 6 is a bottom view of the valve body 11. FIG. 7 is a cross-sectional view taken along the line AA ′ in FIG. 6, and FIG. 7 is a cross-sectional view at the center in the width direction of the valve body 11. Moreover, FIG. 7 is right and left reverse to FIG. FIG. 8 is an arrow cross-sectional view of the diaphragm valve 10 at a position between BB ′ in FIG. 6. FIG. 8 is a view showing a state in which the diaphragm valve 10 is closed.

The valve body 11 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer. It can be formed of a resin such as polychlorotrifluoroethylene, a metal such as iron, copper, copper alloy, brass, aluminum, stainless steel, or porcelain.

As shown in FIG. 3, the valve body 11 has a first end portion 21, a second end portion 22, a central portion 23, and a flow path 24.

The first end portion 21, the second end portion 22, and the central portion 23 are integrally formed. As shown in FIG. 7, the flow path 24 includes the first end portion 21, the central portion 23, and the second end portion. It is formed over the portion 22.

(1-2-1. First end 21 and second end 22)
As shown in FIGS. 3 and 4, the first end portion 21 and the second end portion 22 are disposed so as to sandwich the central portion 23, and are connected to the central portion 23.

As shown in FIG. 3, the first end portion 21 includes a first flange portion 211 to which a pipe is connected, and a first connection portion 212 that connects the first flange portion 211 and the central portion 23. As shown in FIG. 4, the first flange portion 211 has a flange surface 213 in which an inlet 24 a through which fluid flows into the valve body 11 is formed, and pipes can be connected thereto.

Further, as shown in FIG. 4, the second end portion 22 includes a second flange portion 221 to which a pipe is connected, and a second connection portion 222 that connects the second flange portion 221 and the central portion 23. As shown in FIG. 3, the second flange portion 221 has a flange surface 223 in which an outlet 24 b through which fluid is discharged from the valve body 11 is formed, and a pipe can be connected thereto.

The first flange portion 211 and the second flange portion 221 are disposed so as to face each other as shown in FIGS. 3 and 4, and the flange surface 213 and the flange surface 223 face each other as shown in FIG. It is formed to be parallel. The position of the inlet 24a and the position of the outlet 24b are also opposed.

(1-2-2. Central part 23)
As shown in FIG. 5, the center portion 23 is provided between the first end portion 21 and the second end portion 22. The central portion 23 includes a first surface 31, a second surface 32, a wall portion 33 (see FIG. 7), and a rib 34.

As shown in FIG. 3, the first surface 31 is substantially flat and is formed perpendicular to the flange surface 213 and the flange surface 223. An opening 31 a is formed at the center of the first surface 31. The opening 31a is formed with a curved periphery. A direction along a line connecting the inlet 24a to the outlet 24b is defined as a first direction X (also referred to as a fluid flow direction X), and a direction perpendicular to the first direction X and parallel to the first surface 31 is defined as a second direction. The direction Y (also referred to as the width direction Y) is assumed. The first direction X can also be said to be a direction along a straight line perpendicular to the flange surface 213 and the flange surface 223. Further, the movement direction of the stem 63 described later is indicated by an arrow Z (a direction perpendicular to the first direction X and the second direction Y).

As shown in FIG. 5, the second surface 32 is a surface facing the first surface 31 with the flow path 24 interposed therebetween. The second surface 32 is formed along the shape of the flow path 24. The 2nd surface 32 is a surface on the opposite side to the side by which the bonnet 13 of the center part 23 is arrange | positioned.

(1-2-3. Channel 24)
As shown in FIG. 7, the channel 24 is formed from the inlet 24 a to the outlet 24 b, and the wall portion 33 is formed to protrude toward the first surface 31 at the center of the channel 24. The wall 33 is formed such that the inner surface of the channel 24 gently rises toward the first surface 31 so as to form an inclination in the channel 24. The opening 31 a described above is formed at a position corresponding to the wall 33.

A diaphragm 12 to be described later is in pressure contact with an abutting portion 33a that is a tip of the wall portion 33 on the first surface 31 side. As shown in FIG. 8, the contact portion 33 a is formed in a concave shape on the opening 31 a side in a plane perpendicular to the flow direction X. The shape of the contact portion 33a will be described in detail later.

The flow path 24 includes an inlet-side flow path 241 formed from the inlet 24a of the first end portion 21 to the contact portion 33a, and an outlet side formed from the outlet 24b of the second end portion 22 to the contact portion 33a. A flow path 242 and a communication portion 243 that communicates the inlet-side flow path 241 and the outlet-side flow path 242 are provided.

The inlet-side flow path 241 has a curved inner peripheral surface, and the width in the direction perpendicular to the first surface 31 becomes narrower toward the wall 33 as shown in FIG. On the other hand, the width of the inlet-side channel 241 in the direction parallel to the first surface 31 (the direction perpendicular to the paper surface in FIG. 7) becomes wider toward the wall 33.

The outlet side flow path 242 is formed from the outlet 24b of the second flange portion 221 to the contact portion 33a. The outlet-side flow path 242 has a curved inner peripheral surface, and the width in the direction perpendicular to the first surface 31 becomes narrower toward the wall portion 33 as shown in FIG. On the other hand, the width of the outlet-side flow path 242 in the direction parallel to the first surface 31 (the direction perpendicular to the paper surface in FIG. 7) becomes wider toward the wall portion 33.

The communication part 243 is a part of the flow path 24 on the first surface 31 side of the wall 33, and communicates the inlet-side flow path 241 and the outlet-side flow path 242.

As shown in FIG. 4, the second surface 32 has an inlet-side curved portion 321 along the inlet-side flow channel 241 and an outlet-side curved portion 322 along the outlet-side flow channel 242. The entrance-side curved portion 321 and the exit-side curved portion 322 form a protrusion of the wall portion 33 toward the first surface 31 shown in FIG.

(1-2-4. Rib 34)
As shown in FIGS. 5 and 7, the rib 34 is formed so as to protrude from the second surface 32 perpendicular to the first surface 31. As shown in FIG. 6, the rib 34 has a first rib 41 and a second rib 42.

As shown in FIGS. 5 and 7, the first rib 41 is formed along the first direction X from the inlet-side curved portion 321 to the outlet-side curved portion 322 in the second surface 32. The first rib 41 is provided at the center in the second direction Y of the central portion 23.

As shown in FIG. 6, the second rib 42 is formed along the second direction Y, and is provided at the center of the central portion 23 in the first direction X.

Further, an outer edge portion 39 is formed from each of both ends of the first surface 31 in the second direction Y toward the second surface 32 side, and the second rib 42 is formed from one outer edge portion 39 to the other outer edge portion 39. Is formed.

The first rib 41 and the second rib 42 cross in a cross shape in a plan view as shown in FIG.

(1-3. Diaphragm 12)
The material of the diaphragm 12 should just be a rubber-like elastic body, and is not specifically limited. For example, ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene butadiene rubber, chlorinated polyethylene, fluoro rubber, EPDM (ethylene propylene diene rubber), PTFE (polytetrafluoroethylene), etc. are suitable. Material. Further, a high-strength reinforcing cloth may be inserted into the diaphragm 12, and the reinforcing cloth is preferably made of nylon. This is preferable because it is possible to prevent the diaphragm 12 from being deformed or damaged when fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed.

The diaphragm 12 is arrange | positioned at the 1st surface 31 so that the opening part 31a may be plugged up, as shown in FIG. An outer peripheral edge 121 of the diaphragm 12 is sandwiched between a bonnet 13 and a valve body 11 which will be described later.

The diaphragm 12 is moved downward by a driving mechanism 14 described later, and contacts the contact portion 33a of the wall portion 33, thereby closing the communication portion 243 and closing the flow path 24. Further, the diaphragm 12 is moved upward by the drive mechanism 14 and the diaphragm 12 is separated from the contact portion 33a, whereby the flow path 24 is opened.

(1-4. Bonnet 13)
As with the valve body 11, the bonnet 13 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, par It can be formed of a fluoroalkyl vinyl ether copolymer, a resin such as polychlorotrifluoroethylene, or a metal such as iron, copper, copper alloy, brass, aluminum, stainless steel, or porcelain.

As shown in FIG. 1, the bonnet 13 is fixed to the first surface 31 of the valve body 11 with bolts 100 or the like. As shown in FIG. 2, the bonnet 13 is provided so as to cover the opening 31 a via the diaphragm 12. That is, the bonnet 13 has an opening 13a corresponding to the first surface 31, and has a through hole 13b in which a sleeve 62 and a stem 63 described later are disposed at a position facing the opening 13a.

(1-5. Drive mechanism 14)
The drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, and a handle 64.

The compressor 61 is made of PVDF (polyvinylidene fluoride) or the like and is connected to the diaphragm 12. An engagement member 65 is embedded in the diaphragm 12, and the engagement member 65 protrudes on the opposite side (non-wetted surface side) of the valve body 11. The protruding portion of the engaging member 65 is engaged with the compressor 61, and the compressor 61 and the diaphragm 12 are connected.

FIG. 9 is a bottom view of the compressor 61. The compressor 61 has a circular central portion 611 as viewed from the bottom, and a plurality of protruding portions 612 that protrude outward from the central portion 611. An insertion hole 613 into which the engaging member 65 is inserted is formed in the central portion 611. In FIG. 9, a plurality of the protruding portions 612 are formed. Since the plurality of protrusions 612 are formed at an equal angle (about 45 degrees), the two protrusions 612 face each other in the diametrical direction.

FIG. 8 shows an arrow cross-sectional view between CC ′ in FIG. 9, and CC ′ passes through the projecting portions 612 facing each other. As shown in FIG. 8, the compressor 61 has a pressing surface 61 a on the abutting portion 33 a side, and the pressing surface 61 a is formed so as to be convexly curved in the abutting portion 33 a on a plane perpendicular to the flow direction X. Has been. The curved shape of the compressor 61 will be described in detail later.

The sleeve 62 is supported by the through-hole 13b of the bonnet 13 as shown in FIG. A screw shape is formed inside the sleeve 62.

The stem 63 is disposed on the inner side of the sleeve 62 and is screwed with a screw shape formed on the inner side of the sleeve 62. A compressor 61 is fixed to an end of the stem 63 that is disposed inside the bonnet 13. The compressor 61 is engaged with the diaphragm 12 on the valve body 11 side, and is fixed to the stem 63 on the side opposite to the valve body 11.

The handle 64 is fitted to the outer periphery of the portion of the stem 63 located outside the bonnet 13.

<2. Operation>
Next, the operation of the diaphragm valve 10 of the present embodiment will be described. FIG. 10A and FIG. 10B are diagrams schematically showing the operation of the diaphragm 12.

When the handle 64 is rotated in a direction to close the flow path 24 from the state where the flow path 24 is opened as shown in FIG. 10A, the stem 63 descends according to the rotation of the handle 64 (see FIG. 2). . As the stem 63 is lowered, the compressor 61 fixed to the end of the stem 63 is also lowered.

As the compressor 61 descends, the diaphragm 12 is convexly curved toward the second surface 32 as shown in FIG. 10B, and is pressed against the contact portion 33 a of the wall portion 33.

As a result, the flow path 24 of the diaphragm valve 10 is blocked.
On the other hand, when the handle 64 is rotated in the opening direction, the stem 63 rises as the handle 64 rotates. As the stem 63 rises, the compressor 61 also rises, and the central portion of the diaphragm 12 engaged with the compressor 61 rises as shown in FIG.

As a result, the flow path 24 of the diaphragm valve 10 is opened.
<3. Contact part and compressor shape>
FIG. 11 is a view showing the valve body 11 and the compressor 61 in the cross-sectional view of FIG. 8, and is a view showing a state where the flow path 24 is opened. As illustrated in FIG. 11, the contact portion 33 a includes a first main body side bending portion 71 and a second main body side bending portion 72 having different centers in a plane perpendicular to the flow path 24. The first main body side bending portion 71 is formed on the left side of the center 70 of the contact portion 33a in FIG. 11, and the second main body side bending portion 72 is formed on the right side of the center 70 of the contact portion 33a. The first main body side bending portion 71 and the second main body side bending portion 72 are connected at the center 70.

The 1st main body side curved part 71 is formed on the circumference, and the center is shown as 71a. The center 71a is provided above the first main body side bending portion 71 (on the stem 63 side). First body-side curved portion 71 is indicated by the scope of the dotted line (the radius _{R 1)} passing through the center 71a.

The 2nd main body side curved part 72 is formed on the circumference, The center is shown as 72a. The center 72a is provided above the second main body side bending portion 72 (on the stem 63 side). The second body-side curved portion 72 is indicated by the scope of the dotted line (the radius _{R 1)} passing through the center 72a. The first main body side bending portion 71 and the second main body side bending portion 72 are formed symmetrically with respect to the center 70, and the radius from the center 71a of the first main body side bending portion 71 and the second main body side are formed. The radius from the center 72a of the side curved part 72 is the same length.

In the present embodiment, the abutting portion 33a is formed of two curved portions formed on two circumferences of the first main body side bending portion 71 and the second main body side bending portion 72.

On the other hand, the pressing surface 61 a of the compressor 61 has a first pressing side bending portion 81 and a second pressing side bending portion 82 having different centers in a plane perpendicular to the flow path 24. The first pressing side bending portion 81 is formed on the left side of the insertion hole 613 in FIG. 11, and the second main body side bending portion 72 is formed on the right side of the insertion hole 613.

The 1st press side curved part 81 is formed on the periphery, The center is shown as 81a. The center 81a is provided above the first pressing side bending portion 81 (on the stem 63 side). The first pressing side bending portion 81 is shown in a range of a dotted line (radius r ₁ ) passing through the center 81a.

The second pressing side bending portion 82 is formed on the circumference, and the center thereof is shown as 82a. The center 82a is provided above the second pressing side bending portion 82 (on the stem 63 side). The second pressing side bending portion 82 is shown in a range of a dotted line (radius r ₁ ) passing through the center 82a. The first pressing side bending portion 81 and the second pressing side bending portion 82 are formed symmetrically with respect to the central axis of the insertion hole 613, and the radius from the center 81a of the first pressing side bending portion 81 is determined. And the radius from the center 82a of the 2nd press side curved part 82 is the same length.

The first pressing side bending portion 81 is disposed to face the first main body side bending portion 71, and the second pressing side bending portion 82 is disposed to face the second main body side bending portion 72.

Incidentally, the radius _{r 1} at radius _{R 1} and the pressing surface 61a of the contact portion 33a _satisfies _{_{0.2r 1 <R 1 <10r 1}} .

FIG. 12 is a diagram showing a state in which the compressor 64 is moved to the contact portion 33a side (see arrow C) by rotating the handle 64 from the state of FIG. 11 and the diaphragm 12 is pressed against the contact portion 33a. . In FIG. 12, only the valve body 11 and the compressor 61 are shown. A diaphragm 12 is disposed between the valve body 11 and the compressor 61.

As shown in FIG. 12, in the state where the diaphragm 12 is pressed against the contact portion 33a, the center 81a of the first pressing side bending portion 81 of the compressor 61 is the center of the first main body side bending portion 71 of the contact portion 33a. It corresponds to 71a. The center 82a of the second pressing side bending portion 82 of the compressor 61 coincides with the center 72a of the second main body side bending portion 72 of the contact portion 33a. It should be noted that the term “match” in the present specification may be almost the same and includes a mechanical error.

Thus, in a state where the diaphragm 12 is pressed against the contact portion 33a, the first pressing side bending portion 81 and the first main body side bending portion 71 are formed concentrically, and the second pressing side bending portion 82 and The second main body side bending portion 72 is formed on a concentric circle.

As described above, when the diaphragm 61 is pressed against the contact portion 33a by the compressor 61, the

centers

71a and 72a coincide with the

centers

81a and 82a, so that stress concentration occurs when the compressor 61 presses the contact portion 33a. Generation | occurrence | production of a location can be suppressed. For this reason, force can be transmitted successfully from the compressor 61 to the diaphragm 12, and the water stop performance can be improved.

(Embodiment 2)
The diaphragm valve 10 'according to the embodiment of the present invention has the same basic configuration as the diaphragm valve 10 according to the first embodiment. However, unlike the first embodiment, each of the contact portion 33a and the compressor 61 is four. It has two curved parts. For this reason, the second embodiment will be described focusing on the differences from the first embodiment.

FIG. 13 is a diagram showing the compressor 61 ′ and the valve main body 11 ′ of the diaphragm valve 10 ′ according to the second embodiment, and is a diagram showing a state where the flow path 24 is opened. As shown in FIG. 13, the contact portion 33 a ′ includes a first main body side bending portion 71 ′, a second main body side bending portion 72 ′, and a third main body having different centers in a plane perpendicular to the flow path 24. It has a side bending portion 73 ′ and a fourth main body side bending portion 74 ′. The first main body side bending portion 71 ′ is formed on the left side of the center 70 of the contact portion 33a in FIG. 13, and the second main body side bending portion 72 ′ is formed on the right side of the center 70 ′ of the contact portion 33a. Yes. The first main body side bending portion 71 ′ and the second main body side bending portion 72 ′ are connected at the center 70 ′.

The third main body side bending portion 73 ′ is provided on the end side in the width direction Y of the first main body side bending portion 71 ′, and is connected to the first main body side bending portion 71 ′. The fourth main body side bending portion 74 ′ is provided on the end side in the width direction Y of the second main body side bending portion 72 ′, and is connected to the second main body side bending portion 72 ′.

The first main body side curved portion 71 'is formed on the circumference, and the center thereof is shown as 71a'. The center 71a 'is provided above the first main body side bending portion 71' (on the stem 63 side). The first main body side bending portion 71 ′ is shown in a range of a dotted line (radius R ₁ ′) passing through the center 71a ′.

The second main body side curved portion 72 'is formed on the circumference, and the center thereof is shown as 72a'. The center 72a 'is provided above the second main body side bending portion 72' (on the stem 63 side). The second main body side curved portion 72 ′ is shown in a range of a dotted line (radius R ₁ ′) passing through the center 72 a ′. The first main body side bending portion 71 ′ and the second main body side bending portion 72 ′ are formed symmetrically with respect to the center 70 ′, and from the center 71 a ′ of the first main body side bending portion 71 ′. The radius and the radius from the center 72a 'of the second main body side curved portion 72' have the same length.

The third main body side curved portion 73 ′ is formed on the circumference, and the center thereof is shown as 73a ′. The center 73a 'is provided above the third main body side bending portion 73' (on the stem 63 side). The third main body side curved portion 73 ′ is shown in a range of a dotted line (radius R ₂ ′) passing through the center 73 a ′.

The fourth main body side curved portion 74 ′ is formed on the circumference, and the center thereof is shown as 74a ′. The center 74a 'is provided above the fourth main body side bending portion 74' (on the stem 63 side). The fourth main body side curved portion 74 ′ is shown in a range of a dotted line (radius R ₂ ′) passing through the center 74 a ′. The third main body side bending portion 73 ′ and the fourth main body side bending portion 74 ′ are formed symmetrically with respect to the center 70 ′, and the radius from the center 73 a ′ of the third main body side bending portion 73 ′ The radius from the center 74a ′ of the fourth main body side curved portion 74 ′ is the same length.

On the other hand, the pressing surface 61 a ′ of the compressor 61 ′ has a first pressing side bending portion 81 ′, a second pressing side bending portion 82 ′, and a third pressing side bending having different centers in a plane perpendicular to the flow path 24. Part 83 'and 4th press side curved part 84'. The first pressing side bending portion 81 ′ is formed on the left side of the insertion hole 613 in FIG. 11, and the second pressing side bending portion 82 ′ is formed on the right side of the insertion hole 613.

The third pressing side bending portion 83 ′ is provided on the end side in the width direction Y of the first pressing side bending portion 81 ′, and is connected to the first pressing side bending portion 81 ′. The fourth pressing side bending portion 84 ′ is provided on the end side in the width direction Y of the second pressing side bending portion 82 ′, and is connected to the second pressing side bending portion 82 ′.

The first pressing-side curved portion 81 ′ is formed on the circumference, and the center thereof is shown as 81a ′. The center 81a 'is provided above the first pressing side bending portion 81' (on the stem 63 side). The first pressing-side curved portion 81 ′ is shown in a range of a dotted line (radius r ₁ ′) passing through the center 81a ′.

The second pressing side curved portion 82 'is formed on the circumference, and the center thereof is shown as 82a'. The center 82a ′ is provided above (on the stem 63 side) the second pressing side bending portion 82 ′. The second pressing-side curved portion 82 'is shown in a range of a dotted line (radius r ₁ ') passing through the center 82a '. The first pressing side bending portion 81 ′ and the second pressing side bending portion 82 ′ are formed symmetrically with respect to the central axis of the insertion hole 613, and the center 81 a of the first pressing side bending portion 81 ′. The radius from 'and the radius from the center 82a' of the second pressing side curved portion 82 'are the same length.

The third pressing side curved portion 83 ′ is formed on the circumference, and the center thereof is shown as 83 a ′. The center 83a 'is provided above the third pressing side bending portion 83' (on the stem 63 side). The third pressing side curved portion 83 ′ is shown in a range of a dotted line (radius r ₂ ′) passing through the center 83 a ′.

The fourth pressing side curved portion 84 'is formed on the circumference, and the center thereof is shown as 84a'. The center 84a 'is provided above the fourth pressing side bending portion 84' (on the stem 63 side). The fourth pressing side curved portion 84 ′ is shown in a range of a dotted line (radius r ₂ ′) passing through the center 84 a ′. The third pressing side bending portion 83 ′ and the fourth pressing side bending portion 84 ′ are formed symmetrically with respect to the central axis of the insertion hole 613, and the center 83 a of the third pressing side bending portion 83 ′. The radius from 'and the radius from the center 84a' of the fourth pressing side curved portion 84 'are the same length.

The first pressing side bending portion 81 ′ is disposed to face the first main body side bending portion 71 ′, and the second pressing side bending portion 82 ′ is disposed to face the second main body side bending portion 72 ′. Has been. The third pressing side bending portion 83 ′ is disposed to face the third main body side bending portion 73 ′, and the fourth pressing side bending portion 84 ′ is disposed to face the fourth main body side bending portion 74 ′. Has been.

The radius R ₁ ′ and the radius r ₁ ′ satisfy 0.2r ₁ ′ <R ₁ ′ <10r ₁ ′, and the radius R ₂ ′ and the radius r ₂ ′ are 0.2r ₂ ′ <R ₂ ′ < 10r ₂ ′ is satisfied.

FIG. 14 shows a state in which the compressor 61 ′ is moved to the contact portion 33 a ′ side (see arrow C) by rotating the handle 64 from the state of FIG. 13, and the diaphragm 12 is pressed against the contact portion 33 a ′. FIG. FIG. 14 shows only the valve body 11 ′ and the compressor 61 ′. A diaphragm 12 is disposed between the valve body 11 ′ and the compressor 61 ′.

As shown in FIG. 14, in the state where the diaphragm 12 is pressed against the contact portion 33a ′, the center 81a ′ of the first pressing side curved portion 81 ′ of the compressor 61 ′ is the first main body side of the contact portion 33a ′. It coincides with the center 71a ′ of the curved portion 71 ′. Further, the center 82a ′ of the second pressing side curved portion 82 ′ of the compressor 61 ′ coincides with the center 72a ′ of the second main body side curved portion 72 ′ of the contact portion 33a ′. Further, the center 83a ′ of the third pressing side curved portion 83 ′ of the compressor 61 ′ coincides with the center 73a ′ of the third main body side curved portion 73 ′ of the contact portion 33a ′. Further, the center 84a ′ of the fourth pressing side curved portion 84 ′ of the compressor 61 ′ coincides with the center 74a ′ of the fourth main body side curved portion 74 ′ of the contact portion 33a ′. Further, the central angles of the third main body side bending portion 73 ′ and the third pressing side bending portion 83 ′ are substantially the same, and the fourth main body side bending portion 74 ′ and the fourth pressing side bending portion 84 ′ are the same. ing. It should be noted that the term “match” in the present specification may be almost the same and includes a mechanical error.

Thus, in a state where the diaphragm 12 is pressed against the contact portion 33a ′, the first pressing side bending portion 81 ′ and the first main body side bending portion 71 ′ are formed concentrically, and the second pressing side bending portion 82 is formed. 'And the second main body side bending portion 72' are formed on a concentric circle, the third pressing side bending portion 83 'and the third main body side bending portion 73' are formed on a concentric circle, and the fourth pressing side bending portion 84 ' The fourth main body side curved portion 74 ′ is formed on a concentric circle.

As described above, the centers 71a ′, 72a ′, 73a ′, and 74a ′ coincide with the centers 81a ′, 82a ′, 83a ′, and 84a ′ in a state where the diaphragm 12 is pressed against the contact portion 33a ′ by the compressor 61 ′. By doing so, it is possible to suppress the occurrence of stress concentration points when the abutting portion 33a ′ is pressed by the compressor 61 ′. For this reason, the force is successfully transmitted from the compressor 61 'to the diaphragm 12, and the water stop performance can be improved.

<4. Example>
(Example 1, Comparative Example 1)
FIG. 15 is a diagram illustrating an evaluation result based on a water stop pressure obtained by performing a stress analysis on the diaphragm valves of Example 1 and Comparative Example 1. FIG. The case where the water stop pressure was 3 or more was judged as good (◯), and the case where the water stop pressure was less than 3 was judged as bad (x).

In Example 1, stress analysis was performed using the diaphragm valve 10 ′ of Embodiment 2 having the shape of the contact portion 33a ′ and the pressing surface 61a ′ shown in FIGS. 13 and 14, and evaluation of the water stop pressure was performed. Went. As in the present embodiment, the center 81a ′ and the center 71a ′ coincide, the center 82a ′ and the center 72a ′ coincide, the center 83a ′ and the center 73a ′ coincide, and the center 84a ′ and the center 74a ′ coincide. The matching shape can be said to be an offset shape. In the diaphragm of Example 1, the water stop pressure was 3.6, and the determination was good.

In the diaphragm valve 3000 of Comparative Example 1, an abutting portion 3033a and a pressing portion 3061 as shown in FIG. 16 were used. In FIG. 16, the diaphragm 12 is omitted, but the pressing portion 3061 is disposed at a position where the diaphragm 12 presses the contact portion 3033 a. The contact part 3033a shown in FIG. 16 is formed by a curved part 3071 and a curved part 3072 provided symmetrically in the width direction Y. The pressing surface 3061a of the pressing portion 3061 is formed by a bending portion 3081 and a bending portion 3082 provided symmetrically in the width direction Y.

The shape of the bending portion 3071 does not correspond to the shape of the bending portion 3081 and does not match, so the shape of the bending portion 3071 and the shape of the bending portion 3081 are not concentric. In addition, since the shape of the bending portion 3072 does not correspond to the shape of the bending portion 3082 and does not match, the shape of the bending portion 3072 and the shape of the bending portion 3082 are not concentric circles. The diaphragm valve 3000 of Comparative Example 1 having such a non-offset shape was subjected to stress analysis to evaluate the water stop pressure. In the diaphragm valve 3000 of Comparative Example 1, the water stop pressure was 2.4, and the determination was poor.

From the above, it can be confirmed that the water stop performance can be improved by using the offset shape.
(Examples 1 and 2, Comparative Examples 2 and 3)
FIG. 17 is a diagram illustrating the evaluation results based on the water stop pressure obtained by performing the stress analysis on the diaphragm valves of Examples 1 and 2 and Comparative Examples 1 and 2. The case where the water stop pressure was 3 or more was judged as good (◯), and the case where the water stop pressure was less than 3 was judged as bad (x).

In Example 1, stress analysis was performed using the diaphragm valve 10 ′ of Embodiment 2 having the shape of the contact portion 33a ′ and the pressing surface 61a ′ shown in FIGS. 13 and 14, and evaluation of the water stop pressure was performed. Went. The contact portion 33a ′ of the diaphragm valve 10 ′ of FIG. 13 includes a first main body side bending portion 71 ′, a second main body side bending portion 72 ′, a third main body side bending portion 73 ′, and a fourth main body side bending portion 74 ′. These four circumferential shapes are only used. In the diaphragm valve 10 ′ of Example 1, the water stop pressure was 3.6, and the determination was good (◯).

In Example 2, a stress analysis was performed using the diaphragm valve 10 of the first embodiment having the shape of the contact portion 33a and the pressing surface 61a shown in FIGS. 11 and 12, and the water stop pressure was evaluated. . The contact portion 33a of the diaphragm valve 10 of FIG. 11 is formed by only two circumferential shapes of a first main body side bending portion 71 and a second main body side bending portion 72. In the diaphragm valve 10 of Example 2, the water stop pressure was 3.1, and the determination was good (◯).

In the diaphragm valve 1000 of Comparative Example 2, a contact portion 1033a and a pressing portion 1061 as shown in FIG. 18 were used. In FIG. 18, the diaphragm 12 is omitted, but the pressing portion 1061 is disposed at a position where the diaphragm 12 presses the contact portion 1033a.

18 is formed by

curved portions

1071 and 1072 provided at both ends, and a linear portion 1073 provided between the

curved portions

1071 and 1072. The pressing surface 1061a of the pressing portion 1061 includes bending

portions

1081 and 1082 provided at both ends in the width direction Y, a straight portion 1083 formed inside the width direction Y of the bending portion 1081, and the width direction Y of the bending portion 1082. It is formed by the straight line part 1084 formed inside. Further, the center of the bending portion 1071 and the center of the bending portion 1081 coincide with each other, and the center of the bending portion 1072 and the center of the bending portion 1082 coincide with each other. The centers of the bending portion 1071 and the bending portion 1081 are shown as a center 1001a, and the centers of the bending portion 1072 and the bending portion 1082 are shown as a center 1002a. In the diaphragm valve 1000 of Comparative Example 2, the water stop pressure was 2.4, and the determination was poor (x). In the diaphragm valve 2000 of Comparative Example 3, a contact portion 2033a and a pressing portion 2061 as shown in FIG. 19 were used. In FIG. 19, the diaphragm 12 is omitted, but the pressing portion 2061 is arranged at a position where the diaphragm 12 presses the contact portion 2033 a.

The contact portion 2033a shown in FIG. 19 includes

straight portions

2071 and 2072 provided at both ends in the movement direction Z of the stem 63, and a straight portion provided along the width direction Y between the

straight portions

2071 and 2072. 2073. The pressing surface 2061a of the pressing portion 2061 includes

linear portions

2081 and 2082 provided in the moving direction Z at both ends in the width direction Y, and linear portions provided along the width direction Y inside the width direction Y of the linear portion 2081. 2083 and a straight portion 2084 provided along the width direction Y inside the width direction Y of the straight portion 2082. In the diaphragm valve 2000 of Comparative Example 3, the water stop pressure was 2.1, and the determination was poor (x).

From the above, it can be seen that the contact portion with which the diaphragm 12 contacts is preferably formed in a curved shape in a plane perpendicular to the flow path 24.

(Examples 3 to 9, Comparative Examples 4 and 5)
Next, in the diaphragm valve 10 of the _first embodiment, stress analysis was performed for Examples 3 to 9 and Comparative Examples 4 and 5 in which the ratio of R ₁ to r ₁ was changed, and the water stop pressure was evaluated.

FIG. 20 is a diagram showing the result of stress analysis performed on Examples 3 to 9 and Comparative Examples 4 and 5 to evaluate the water stop pressure.

In Comparative Example 4, when R ₁ = 0.1 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 2.8, and the determination was poor (×).

In Example 3, when R ₁ = 0.2 × r ₁ was set and the water stop pressure was determined by fluid analysis, it was 3.1, and the determination was good (◯).

In Example 4, when R ₁ = 0.5 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 3.2, and the determination was good (◯).

In Example 5, when R ₁ = 1 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 3.5, and the determination was good (◯).

In Example 6, when R ₁ = 3 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 4.2, and the determination was good (◯).

In Example 7, when R ₁ = 6 × r ₁ was set and the water stop pressure was determined by fluid analysis, it was 4.3, and the determination was good (◯).

In Example 8, when R ₁ = 9 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 3.4, and the determination was good (◯).

In Example 9, when R ₁ = 10 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 3.1, and the determination was good (◯).

In Comparative Example 5, when R ₁ = 11 × r ₁ was set and the water stop pressure was obtained by fluid analysis, it was 2.9, and the determination was poor (×).

From the above, it can be seen that 0.2r ₁ <R ₁ <10r is preferably satisfied.
<5. Features>
(5-1)

Diaphragm valves

10 and 10 ′ according to the embodiment include

valve bodies

11 and 11 ′, a diaphragm 12 (an example of a valve unit),

compressors

61 and 61 ′ (an example of a pressing unit), and a handle 64 (an example of a driving unit). And). The valve

main bodies

11 and 11 ′ include a flow path 24, an opening 31a, and

contact portions

33a and 33a ′. The flow path 24 is formed inside. The opening 31 a is formed in the middle of the flow path 24. The

contact portions

33 a and 33 a ′ are provided at positions corresponding to the openings 31 a of the flow path 24. The

contact portions

33 a and 33 a ′ are first main body

side bending portions

71 and 71 ′ and second main body side bending portion 72 that are concavely curved toward the opening 31 a in a plane perpendicular to the flow direction X of the flow path 24. , 72 ′. The diaphragm 12 is disposed so as to close the opening 31a, and can close the flow path 24 by contacting the

contact portions

33a and 33a ′. The

compressors

61, 61 ′ include first pressing

side bending portions

81, 81 ′ and second pressing side bending portions 82, which are convexly curved toward the

contact portions

33 a, 33 a ′ in a plane perpendicular to the flow direction X. 82 'and presses the diaphragm 12 against the

contact portions

33a and 33a'. The handle 64 drives the compressors 61 and 61 'to press the diaphragm 12 against the

contact portions

33a and 33a' or to move away from the

contact portions

33a and 33a '. In a state where the diaphragm 12 is pressed against the

contact portions

33a and 33a ′ by the

compressors

61 and 61 ′, the first main body

side bending portions

71 and 71 ′ are opposed to the first pressing

side bending portions

81 and 81 ′, and the first The bending centers 71a and 71a ′ of the main body

side bending portions

71 and 71 ′ coincide with the bending centers 81a and 81a ′ of the first pressing

side bending portions

81 and 81 ′, and the second main body

side bending portions

72 and 72 ′. Faces the second pressing side bending portions 82, 82 ', and the bending centers 72a, 72a' of the second main body side bending portions 72, 72 'are the bending centers 82a of the second pressing

side bending portions

82, 82'. , 82a ′.

The center of the curved portion formed in the compressor 61 and the center of the curved portion formed in the corresponding contact portion 33a are pressed against the

contact portions

33a and 33a ′ by the

compressors

61 and 61 ′. By matching in a state, generation | occurrence | production of the stress concentration location in

contact part

33a, 33a 'can be suppressed.

For this reason, the force is successfully transmitted from the compressors 61 and 61 'to the diaphragm 12, and the water stop performance can be improved.

(5-2)
In the

diaphragm valves

10 and 10 ′ of the present embodiment, the first main body

side bending portions

71 and 71 ′ and the second main body

side bending portions

72 and 72 ′ have the same radii R _{1 and} R ₁ ′ (main body side). The first pressing

side bending portions

81 and 81 ′ and the second pressing

side bending portions

82 and 82 ′ have the same radii r ₁ and r ₁ ′ (an example of the pressing side radius). Have. R ₁ and r ₁ satisfy 0.2r ₁ <R ₁ <10r ₁ . R ₁ ′ and r ₁ ′ satisfy 0.2r ₁ ′ <R ₁ ′ <10r ₁ ′.

(5-3)
In the

diaphragm valve

10, 10 ′ of the present embodiment, the first main body

side bending portions

71, 71 ′ and the second main body

side bending portions

72, 72 ′ have

centers

70, 70 ′ in the width direction Y of the flow path 24. It is formed symmetrically with respect to the reference.

This makes it easy to create the valve body 11 due to the symmetrical shape, and can improve the water stop performance.

(5-4)
In the

diaphragm valves

10 and 10 ′ of the present embodiment, the first main body

side bending portions

71 and 71 ′ and the second main body

side bending portions

72 and 72 ′ are at the

centers

70 and 70 ′ in the width direction Y of the flow path 24. It is connected.

Thus, water stop performance can be improved by connecting between two curved parts.
(5-5)
In the

diaphragm valve

10, 10 ′ of the present embodiment, the contact portion 33 a ′ is a third main body side curved portion that is concavely curved toward the opening portion 31 a in a plane perpendicular to the flow direction X of the flow path 24. 73 ′ and a fourth main body side curved portion 74 ′. The third main body side bending portion 73 ′ is disposed closer to the end side in the width direction Y than the first main body side bending portion 71 ′. The fourth main body side bending portion 74 ′ is disposed closer to the end side in the width direction Y than the second main body side bending portion 72 ′. The compressor 61 ′ (an example of a pressing portion) includes a third pressing side bending portion 83 ′ and a fourth pressing side bending portion 84 ′ that are curved convexly toward the contact portion 33 a in a plane perpendicular to the flow direction X. Have. The third pressing side bending portion 83 ′ is disposed closer to the end side in the width direction Y than the first pressing side bending portion 81 ′. The fourth pressing side bending portion 84 ′ is disposed closer to the end side in the width direction Y than the second pressing side bending portion 82 ′. In a state where the diaphragm 12 (an example of the valve portion) is pressed against the contact portion 33a ′ by the compressor 61 ′, the third main body side bending portion 73 ′ faces the third pressing side bending portion 83 ′, and the third main body side The bending center 73a ′ of the bending portion 73 ′ coincides with the bending center 83a ′ of the third pressing-side bending portion 83 ′, and the fourth main body-side bending portion 74 ′ faces the fourth pressing-side bending portion 84 ′. The center of curvature 74a 'of the fourth main body side curved portion 74' coincides with the center of curvature 84a 'of the fourth press side curved portion 84'.

Thus, the water stop performance can be improved by having the four curved portions in both the compressor 61 ′ and the contact portion 33a ′.

(5-6)

Diaphragm valves

10 and 10 ′ of the present embodiment are driven by a handle 64.

In this way, it can be driven manually and the flow path 24 can be closed or opened.
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the above-described embodiment, the lengths of the radii of the first main body

side bending portions

71 and 71 ′ and the radii of the second main body

side bending portions

72 and 72 ′ are the same, but they may be different. In this case, it is preferable that the first pressing

side bending portions

81 and 81 ′ and the second pressing

side bending portions

82 and 82 ′ are also different corresponding to the

valve bodies

11 and 11 ′. Further, the length of the radius of the third main body side bending portion 73 ′ may be different from the length of the radius of the fourth main body side bending portion 74 ′.

(B)
In the first embodiment, the contact portion 33a is provided with two bending portions (the first main body side bending portion 71 and the second main body side bending portion 72). In the second embodiment, the contact portion 33a ' Four bending portions (first main body side bending portion 71 ′, second main body side bending portion 72 ′, third main body side bending portion 73 ′, and fourth main body side bending portion 74 ′) are provided. Two or more curved portions may be provided.

(C)
In the diaphragm valve 10 of the above-described embodiment, the manual handle 64 is provided as an example of the drive unit, but the stem 63 may be driven by an air drive type or an electric drive type drive unit.

The diaphragm valve of the present invention exhibits an effect capable of improving the water stop performance and can be used in a plant or the like.

DESCRIPTION OF SYMBOLS 10: Diaphragm valve 12: Diaphragm 24: Flow path 31a: Opening part 33a: Contact part 61: Compressor 71: 1st main body side curved part 71a: Center 72: 2nd main body side curved part 72a: Center 81: 1st press Side curved portion 81a: Center 82: Second pressing side curved portion 82a: Center

Claims

A flow path formed inside, an opening formed in the middle of the flow path, and a contact portion provided at a position corresponding to the opening of the flow path, the contact portion Is a valve body including a first main body side curved portion and a second main body side curved portion that are concavely curved toward the opening in a plane perpendicular to the flow direction of the flow path;
A valve portion that is arranged so as to close the opening and can close the flow path by contacting the contact portion;
A first pressing-side bending portion and a second pressing-side bending portion that are convexly curved toward the contact portion side in a plane perpendicular to the flow direction, and press the valve portion against the contact portion And
A driving part that drives the pressing part to press the valve part against the contact part or separate from the contact part,
In a state in which the valve portion is pressed against the contact portion by the pressing portion, the first main body side bending portion faces the first pressing side bending portion, and the center of bending of the first main body side bending portion is The second main body side bending portion is opposite to the second pressing side bending portion, and the second main body side bending portion is centered at the bending center of the first pressing side bending portion. 2 coincides with the center of curvature of the curved portion on the pressing side,
Diaphragm valve.
The first main body side bending portion and the second main body side bending portion have a main body side radius of the same size,
The first pressing side bending portion and the second pressing side bending portion have the same pressing side radius,
When the main body side radius is R 1 and the pressing side radius is r 1 ,
0.2r 1 <R 1 <10r 1 is satisfied,
The diaphragm valve according to claim 1.
The first main body side bending portion and the second main body side bending portion are formed symmetrically with respect to the center in the width direction of the flow path,
The diaphragm valve according to claim 1 or 2.
The first main body side bending portion and the second main body side bending portion are connected at the center in the width direction of the flow path,
The diaphragm valve according to any one of claims 1 to 3.
The contact portion includes a third main body side curved portion and a fourth main body side curved portion that are concavely curved toward the opening in a plane perpendicular to the flow direction of the flow path,
The third main body side bending portion is disposed closer to the end side in the width direction of the flow path than the first main body side bending portion,
The fourth main body side bending portion is disposed closer to the end in the width direction than the second main body side bending portion,
The pressing portion includes a third pressing side bending portion and a fourth pressing side bending portion that are curved in a convex shape toward the contact portion side in a plane perpendicular to the flow direction,
The third pressing side bending portion is disposed closer to the end side in the width direction than the first pressing side bending portion,
The fourth pressing side bending portion is disposed on the end side in the width direction with respect to the second pressing side bending portion,
In a state in which the valve portion is pressed against the contact portion by the pressing portion, the third main body side bending portion faces the third pressing side bending portion, and the center of bending of the third main body side bending portion is , The fourth pressing side bending portion coincides with the center of bending of the third pressing side bending portion, the fourth pressing side bending portion faces the fourth pressing side bending portion, and the bending center of the fourth main body side bending portion is 4 coincides with the center of the curved portion on the pressing side,
The diaphragm valve according to any one of claims 1 to 4.
The driving unit is a manual type, an air driving type, or an electric driving type.
The diaphragm valve according to any one of claims 1 to 5.