KR20200070364A - Diaphragm valve - Google Patents

Abstract

In the diaphragm valve 10, when viewed from the cross section in the center of the width direction Y of the flow path 24, the inlet side flow path 241 is the first flow path forming surface 35 formed on the opening 31a side. And, it is formed by the second flow path forming surface 36 formed on the side opposite to the opening 31a. When viewed from the cross section of the second flow path forming surface 36, the inlet side inflection point 36a, which is the inflection point of the line, includes the inner circumferential surface 31c on the inlet 24a side of the opening 31a and the first flow path forming surface 35 It is arrange|positioned at the outlet 24b side rather than the entrance-side contact point 31d which is an intersection when viewed from the cross section of. The entrance-side contact point 31d is disposed on the opening 31a side than the entrance-side inflection point 36a. The angle θ1 when viewed from the cross section of the first flow path forming surface 35 forming the inlet contact point 31d and the inner circumferential surface 31c on the inlet 24a side of the opening 31a is 0°<θ1 ≤ 90° is satisfied.

Description

Diaphragm valve

The present invention relates to a diaphragm valve.

A diaphragm valve is formed in a piping line in a plant such as water treatment, chemical, food, etc., and the fluid flowing through the piping is controlled by the diaphragm valve (see, for example, Patent Document 1).

In such a diaphragm valve, piping is connected to both ends to be installed in the plant. In the diaphragm valve, the flow path is closed by the diaphragm being pressed against the partition wall, and the flow path is opened by the diaphragm being separated from the partition wall.

Japanese Patent Application Publication No. 2009-121547

However, in the diaphragm valve shown in Patent Document 1, since the direction of the flow of the fluid is forcibly changed from the inlet toward the portion where the diaphragm comes into contact, pressure loss may occur.

An object of the present invention is to provide a diaphragm valve capable of reducing pressure loss.

In order to achieve the above object, the diaphragm valve according to the first invention includes a valve body, a valve portion, a lid portion, and a driving mechanism. The valve body has a flow path, an opening portion, and abutting portions. The flow path connects the inlet and the outlet formed to face each other, and is formed inside. The opening is formed in the middle of the flow path. The abutting portion is formed at a position corresponding to the opening of the flow path. The valve portion is arranged to close the opening, and the flow path can be closed by contacting the abutting portion. The cover portion is fixed to the valve body so as to cover the valve portion. The drive mechanism opens and closes the flow path by driving the valve portion. The flow path has an inlet side flow path formed from the inlet to the abutment, and an outlet side flow path formed from the abutment to the outlet. When viewed from the cross section in the center of the width direction of the flow path, the inlet-side flow path is formed by a first flow path forming surface formed on the opening side and a second flow path forming surface formed on the side opposite to the opening. The entrance-side inflection point, which is the inflection point of the line when viewed from the cross-section of the second flow path forming surface, is the inlet side or the exit side than the entrance-side intersection point, which is the intersection point when viewed from the cross-section of the inlet-side inner peripheral surface and the first flow-path forming surface. Is placed in. The entrance-side intersection point is arranged at the opening side than the entrance-side inflection point. The angle θ1 when viewed from the cross section of the first flow path forming surface forming the entrance-side intersection and the inner circumferential surface of the opening side satisfies 0° <θ1 ≤ 90°.

As described above, by changing the position of the entrance-side inflection point in the direction from the entrance to the exit when viewed from the side, differs from the position of the entrance-side intersection, and by setting the angle θ1 to be greater than 0° and 90° or less, In the flow path from the inlet to the abutment, the fluid can move smoothly even if the direction changes. For this reason, the load of the cover part and the valve part provided from a fluid can be reduced, and pressure loss can be reduced.

The diaphragm valve according to the second invention is a diaphragm valve according to the first invention, wherein the length between the inlet-side inflection point and the inlet-side intersection in the direction from the inlet to the outlet is L1, and in the direction from the inlet to the outlet When the length from the inlet to the contact portion is L2, 0.03 ≤ L1/L2 ≤ 0.45 is satisfied.

Thus, when L1 and L2 satisfy the said range, a pressure loss can be reduced.

The diaphragm valve according to the third invention is a diaphragm valve according to the first or second invention, and when viewed from a cross section in the center of the width direction of the flow path, the outlet side flow path and the third flow path forming surface formed on the opening side , It is formed by the fourth flow path forming surface formed on the opposite side to the opening. The exit-side inflection point, which is an inflection point of the line when viewed from the cross-section of the fourth flow path forming surface, is the inlet side or the exit side than the exit-side intersection point, which is the intersection point when viewed from the cross-section of the outlet side inner peripheral surface and the third flow path forming surface. Is placed in. The exit-side intersection point is disposed on the opening side than the exit-side inflection point. The angle θ2 when viewed from the cross section of the third flow path forming surface forming the exit intersection point and the inner circumferential surface of the exit side of the opening satisfies 0° <θ2 ≤ 90°.

As described above, by changing the position of the inflection point on the exit side in the direction from the entrance to the exit when viewed from the side, it is different from the position of the intersection on the exit side, and by setting the angle θ2 to be greater than 0° and less than 90°, In the flow path from the contact portion to the outlet, the fluid can move smoothly even if the direction changes. For this reason, the load of the cover part and the valve part provided from a fluid can be reduced, and pressure loss can be reduced.

The diaphragm valve according to the fourth aspect of the invention is a diaphragm valve according to the aspect of the third aspect, wherein the length between the inflection point on the outlet side and the intersection point on the outlet side in the direction from the inlet to the outlet is L3, and the direction from the inlet toward the outlet When the length from the abutting portion to the outlet in L4 is L4, 0.03 ≤ L3/L4 ≤ 0.4 is satisfied.

Thus, when L3 and L4 satisfy the said range, a pressure loss can be reduced.

The diaphragm valve according to the fifth invention is a diaphragm valve according to any one of the first to fourth inventions, and the drive mechanism includes a shaft member, a pressing portion, and a driving portion. The shaft member is supported by the lid portion. The pressing portion is attached to the shaft member, and is also connected to the valve portion. The drive unit drives the shaft member. The driving unit is a manual, air-driven, or electric-driven type.

In this way, the shaft member can be driven manually, by air or electricity, and the flow path is closed or opened.

According to the present invention, it is possible to provide a diaphragm valve capable of reducing pressure loss.

1 is a perspective view of a diaphragm valve of an embodiment according to the present invention.
FIG. 2 is a partial cross-sectional view of the diaphragm valve of FIG. 1.
3 is a perspective view of the valve body of FIG. 1 as viewed from above.
4 is a perspective view of the valve body of FIG. 1 when viewed from below.
5 is a front view of the valve body of FIG. 1.
6 is a bottom view of the valve body of FIG. 1.
7 is a cross-sectional view indicated by arrows between AA′ in FIG. 6.
Fig. 8 is a schematic cross-sectional view showing a state in which the flow path is closed, and (b) is a schematic cross-sectional view showing the state in which the flow channel is opened.
It is a figure which shows the table of the result which calculated the pressure loss rate and the rate of rate change in Examples 1-8 and Comparative Examples 1-4.
10 is a cross-sectional configuration diagram showing the structure of the valve body of Comparative Example 5.
11 is a view showing the results of fluid analysis of the valve body of Comparative Example 5.
12 is a view showing the results of fluid analysis of the valve body of Example 8.
13 is a view showing the results of fluid analysis of the valve body of Comparative Example 6.

Hereinafter, the diaphragm valve in the embodiment according to the present invention will be described with reference to the drawings.

<1. Configuration>

1 is an external perspective view of a diaphragm valve 10 of an embodiment according to the present invention. 2 is a partial cross-sectional configuration diagram of the diaphragm valve 10 of the present embodiment.

The diaphragm valve 10 of this embodiment is provided with the valve body 11, the diaphragm 12, the bonnet 13, and the drive mechanism 14, as shown in FIGS. 1 and 2. Piping is connected to both ends of the valve body 11, and a flow path 24 through which 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 drive mechanism 14 is disposed in the bonnet 13 and drives the diaphragm 12.

(Valve body 11)

3 is a perspective view of the valve body 11 seen from the first surface 31 side, which will be described later. 4 is a perspective view of the valve body 11 seen from the side of the second surface 32 to be described later. 5 is a front view of the valve body 11, and FIG. 6 is a bottom view of the valve body 11. 7 is a cross-sectional view indicated by arrows between AA′ in FIG. 6, and FIG. 7 is a cross-sectional view in the center of the valve body 11 in the width direction. Moreover, FIG. 7 is reversed left and right from FIG. 5.

The valve body 11 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride tube), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, perfluor It can be formed by a resin such as a roalkyl vinyl ether copolymer, polychlorotrifluoroethylene, or 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 1st end part 21, the 2nd end part 22, and the center part 23 are integrally formed, and the flow path 24 is the 1st end part 21 and the center part 23, as shown in FIG. ) And the second end 22.

(First end 21, second end 22)

As shown in FIGS. 3 and 4, the first end portion 21 and the second end portion 22 are arranged 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 piping is connected, and a first connection portion 212 connecting the first flange portion 211 and the central portion 23. Have As shown in FIG. 4, the 1st flange part 211 has the 1st flange surface 213 in which the inlet 24a into which the fluid flows into the valve body 11 was formed, and piping is connectable.

Moreover, as shown in FIG. 4, the 2nd end part 22 is the 2nd flange part 221 to which piping is connected, and the 2nd connection part 222 which connects the 2nd flange part 221 and the center part 23 ). As shown in FIG. 3, the 2nd flange part 221 has the 2nd flange surface 223 in which the outlet 24b from which the fluid discharges from the valve body 11 was formed, and piping is connectable.

The first flange portion 211 and the second flange portion 221 are disposed to face each other as shown in FIGS. 3 and 4, and the first flange surface 213 and the second flange surface 223 are shown in FIG. 7. As shown in, it is formed so as to be parallel to each other. Further, the positions of the inlet 24a and the positions of the outlet 24b are also opposed.

(Central part 23)

The central part 23 is formed between the 1st end part 21 and the 2nd end part 22, as shown in FIG. The central portion 23 has a first surface 31, a second surface 32, a wall portion 33 (see FIG. 7 ), and a rib 34.

The first surface 31 is substantially planar, as shown in FIG. 3, and is formed perpendicular to the first flange surface 213 and the second flange surface 223. An opening 31a is formed in the center of the first surface 31. The opening 31a is formed by bending its circumferential edge. Further, the direction along the line connecting the outlet 24b from the inlet 24a is set to the direction X, and the direction perpendicular to the first direction X and parallel to the first surface 31 is also referred to as the second direction ( Let Y) (also called width direction (Y)). The first direction X may also be referred to as a direction along a straight line perpendicular to the first flange surface 213 and the second flange surface 223.

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 second surface 32 is a surface opposite to the side on which the bonnet 13 of the central portion 23 is disposed.

(Euro 24)

As shown in FIG. 7, the flow path 24 is formed from the inlet 24a to the outlet 24b. The wall portion 33 is formed to protrude toward the first surface 31 at the center of the flow path 24. The wall part 33 is formed so that the inner surface of the flow path 24 gently rises toward the first surface 31 so as to form an inclination in the flow path 24. The above-mentioned opening 31a is formed at a position corresponding to the wall portion 33. The diaphragm 12 to be described later is pressed against the front end portion 33a on the first surface 31 side of the wall portion 33.

The flow path 24 is formed from the inlet 24a of the first end 21 to the tip portion 33a, and the inlet side flow path 241 and the tip portion 33a from the outlet 24b of the second end 22 It has an outlet side flow path 242 formed up to, and a communication portion 243 for connecting the inlet side flow path 241 and the outlet side flow path 242 in succession.

As shown in FIG. 7, the entrance-side flow passage 241 is narrowed as the width in the direction perpendicular to the first surface 31 faces the wall portion 33. On the other hand, the width of the inlet side flow path 241 in the direction parallel to the first surface 31 (the direction perpendicular to the paper surface in FIG. 7) is widened as it faces the wall portion 33. .

The outlet side flow passage 242 is formed from the outlet 24b of the second flange portion 221 to the tip portion 33a. As shown in FIG. 7, the exit-side flow passage 242 is narrowed as the width in the direction perpendicular to the first surface 31 faces the wall portion 33. On the other hand, the width of the exit-side flow path 242 in a direction parallel to the first surface 31 (direction perpendicular to the paper surface in FIG. 7) is widening toward the wall portion 33.

The communication portion 243 is a portion of the flow path 24 on the side of the first surface 31 of the wall portion 33, and allows the inlet-side flow path 241 and the outlet-side flow path 242 to pass through.

As shown in FIG. 4, the second surface 32 has an inlet side curved portion 321 along the inlet side flow path 241 and an outlet side curved portion 322 along the outlet side flow path 242. Protrusions to the first surface 31 side of the wall portion 33 shown in FIG. 7 are formed by the inlet-side curved portion 321 and the outlet-side curved portion 322.

Of the inner surfaces facing the inlet-side flow path 241 of the first end portion 21 and the central portion 23, the inner surface portion of the first surface 31 side shown in the sectional view in Fig. 7 is the first flow path forming surface 35. , The inner surface portion on the second surface 32 side is referred to as a second flow path forming surface 36. The inlet-side flow passage 241 is formed by a first flow passage forming surface 35 and a second flow passage forming surface 36.

7, the first flow path forming surface 35 is formed substantially perpendicular to the inlet 24a and the outlet 24b. Disadvantages of the flow path 24 side of the inner circumferential surface 31c on the inlet 24a side of the opening 31a, that is, of the inner circumferential surface 31c on the inlet 24a side of the opening 31a The intersection with the first flow path forming surface 35 forms an inlet side contact point 31d with the fluid flowing through the flow path 24. In FIG. 7, the angle θ1 formed by the first flow path forming surface 35 and the inner circumferential surface 31c at the inlet contact point 31d satisfies 0° <θ1 ≤ 90°. Thereby, since the diaphragm 12 curves along the inner circumferential surface 31c when it is convexly curved toward the second surface 32 by the compressor 61 (to be described later), the diaphragm 12 at the inlet side contact point 31d ) Stress can be reduced.

The second flow path forming surface 36 has an inlet-side inflection point 36a, as shown in the cross-sectional view in FIG. 7. The second flow path forming surface 36 includes a first portion 36b from the inlet 24a to the inlet side inflection point 36a, and a second portion 36c from the inlet side inflection point 36a to the tip portion 33a. Have The first portion 36b is formed by convexly curved toward the second surface 32 so as to approach the first surface 31 as it goes from the inlet 24a toward the tip portion 33a. The second portion 36c is formed by bending toward the first surface 31 so as to approach the first surface 31 from the inlet-side inflection point 36a.

The entrance-side contact point 31d is disposed on the first surface 31 side than the entrance-side inflection point 36a. Specifically, in the direction perpendicular to the first surface 31 (opening 31a), the distance from the first surface 31 to the entrance-side contact point 31d is the entrance side from the first surface 31. It is shorter than the distance to the inflection point 36a.

Moreover, in the direction of the arrow X, the positions of the inlet-side contact point 31d and the inlet-side inflection point 36a do not coincide, and the inlet-side inflection point 36a is closer to the tip portion 33a (outlet) than the inlet-side contact point 31d. (Also referred to as (24b) side). Further, the inlet-side inflection point 36a may be located on the inlet 24a side than the inlet-side contact point 31d.

In addition, the length between the inlet-side contact point 31d and the inlet-side inflection point 36a in the arrow X direction is L1, and the length from the inlet 24a in the arrow X direction to the tip portion 33a is L2. It is more preferable to satisfy 0.03 ≤ L1/L2 ≤ 0.45.

In the valve body 11 of the diaphragm valve 10 of the present embodiment, the basic configuration from the inlet 24a to the tip portion 33a is symmetrical to the basic configuration from the outlet 24b to the tip portion 33a. have. The contact point and the inflection point at the outlet 24b side will be described below, but have the same configuration as the above-described inlet 24a side. In addition, since the diaphragm valve 10 of this embodiment is symmetrical to the left and right, L2 is half the length of the diaphragm valve 10 (also referred to as a valve half length).

That is, the inner surface portion on the first surface 31 side shown in the sectional view in FIG. 7 among the inner surfaces facing the outlet-side passage 242 of the second end portion 22 and the central portion 23 is the third flow path forming surface 37 The inner surface portion on the second surface 32 side is referred to as the fourth flow path forming surface 38. The outlet-side flow passage 242 is formed by a third flow passage forming surface 37 and a fourth flow passage forming surface 38.

7, the third flow path forming surface 37 is formed substantially perpendicular to the inlet 24a and the outlet 24b. Disadvantages of the flow path 24 side of the inner circumferential surface 31e at the outlet 24b side of the opening 31a, that is, formation of a third flow path of the inner circumferential surface 31e at the outlet 24b side of the opening 31a The intersection point with the surface 37 forms an outlet side contact point 31f with the fluid flowing through the flow path 24. In FIG. 7, the angle (also referred to as a contact angle) (θ2) formed by the third flow path forming surface 37 and the inner peripheral surface 31e at the outlet-side contact point 31f satisfies 0° <θ2 ≤ 90° do. Thereby, since the diaphragm 12 curves along the inner circumferential surface 31c when it is convexly curved toward the second surface 32 by the compressor 61 (to be described later), the diaphragm 12 at the inlet contact point 31d ) Stress can be reduced.

The fourth flow path forming surface 38 has an exit-side inflection point 38a, as shown in the sectional view in FIG. 7. The fourth flow path forming surface 38 is the first portion 38b from the outlet 24b to the outlet side inflection point 38a, and the second portion 38c from the outlet side inflection point 38a to the tip portion 33a. Have The first portion 38b is formed by convexly curved toward the second surface 32 so as to approach the first surface 31 as it goes from the inlet 24a toward the tip portion 33a. The second portion 38c is formed by bending toward the first surface 31 so as to be closer to the first surface 31 from the exit-side inflection point 38a.

The exit-side contact point 31f is disposed on the first surface 31 side than the exit-side inflection point 38a. Specifically, in the direction perpendicular to the first surface 31 (opening 31a), the distance from the first surface 31 to the exit-side contact point 31f is from the first surface 31 It is shorter than the distance to the exit inflection point 38a.

Moreover, in the direction of the arrow X, the positions of the exit-side contact point 31f and the exit-side inflection point 38a do not coincide, and the exit-side inflection point 38a is closer to the tip portion 33a than the exit-side contact point 31f (entrance) (24a) side). Moreover, the exit-side inflection point 38a may be disposed at the outlet 24b side rather than the outlet-side contact point 31f.

The length between the exit-side contact point 31f in the arrow X direction and the exit-side inflection point 38a is L3, and the length from the exit 24b in the arrow X direction to the tip portion 33a is L4. If it is, it is more preferable to satisfy 0.03 ≤ L3/L4 ≤ 0.45.

(Rib (34))

The ribs 34 are formed to protrude from the second surface 32 perpendicular to the first surface 31 as shown in FIGS. 4 and 6. The rib 34 has a first rib 41 and a second rib 42.

4 and 6, the first rib 41 is from the inlet-side curved portion 321 in the second surface 32 to the outlet-side curved portion 322 along the first direction X, as shown in FIGS. 4 and 6. Is formed. Moreover, the 1st rib 41 is formed in the center of the center part 23 in the 2nd direction Y.

The second rib 42 is formed along the second direction Y and is formed at the center in the first direction X of the central portion 23.

Moreover, the outer edge part 39 is formed toward the 2nd surface 32 side from each of both ends of the 2nd direction Y of the 1st surface 31, and the 2nd rib 42 is one side It is formed from the outer edge portion 39 to the other outer edge portion 39.

The first ribs 41 and the second ribs 42 cross each other in a planar shape as shown in Fig. 6 in the central portion 43, which is the center of each.

(Diaphragm (12))

The material of the diaphragm 12 may just be a rubber-like elastic body, and is not particularly limited. For example, ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene-butadiene rubber, chlorinated polyethylene, fluorine rubber, EPDM (ethylene/propylene/diene rubber), PTFE (polytetrafluoroethylene) Etc. are mentioned as a preferable 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 deformation or breakage of the diaphragm 12 when fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed.

The diaphragm 12 is arranged on the first surface 31 so as to close the opening 31a as shown in FIG. 2. The outer circumferential edge portion 121 of the diaphragm 12 is sandwiched between the bonnet 13 to be described later and the valve body 11.

The diaphragm 12 moves downward by the driving mechanism 14 to be described later, and closes the communication portion 243 by contacting the tip portion 33a of the wall portion 33, thereby closing the flow path 24. Moreover, the diaphragm 12 moves upward by the drive mechanism 14, and the flow path 24 is opened by the diaphragm 12 being separated from the front-end|tip part 33a.

(Bonnet (13))

The bonnet 13, like the valve body 11, is PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride tube), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, poly It can be formed of a resin such as tetrafluoroethylene, perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, or a metal such as iron, copper, copper alloy, brass, aluminum, stainless steel, or porcelain. .

The bonnet 13 is fixed to the first surface 31 of the valve body 11 by a bolt 100 or the like, as shown in FIGS. 1 and 2. The bonnet 13 is formed so as to cover the opening 31a via the diaphragm 12. That is, the bonnet 13 has an opening 13a corresponding to the first surface 31, and a through hole in which the sleeve 62 and the stem 63, which will be described later, are disposed at positions facing the opening 13a. (13b).

(Drive mechanism 14)

The drive mechanism 14 has a compressor 61, a sleeve 62, a stem 63, and a handle 64.

The compressor 61 is formed of PVDF (polyvinylidene fluoride) or the like, and is connected to the diaphragm 12. The engagement member 65 is embedded in the diaphragm 12, and the engagement member 65 protrudes to the opposite side (non-contact surface side) of the valve body 11. The protruding part of the engaging member 65 is engaged with the compressor 61, so that the compressor 61 and the diaphragm 12 are connected.

The sleeve 62 is supported by the through hole 13b of the bonnet 13. A screw shape is formed inside the sleeve 62.

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

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

<2. Action>

Next, the operation of the diaphragm valve 10 of this embodiment will be described. 8A and 8B are diagrams schematically showing the operation of the diaphragm 12.

When the handle 64 is rotated in the direction in which the flow path 24 is closed from the state in which the flow path 24 is open as shown in Fig. 8(a), the stem 63 is rotated according to the rotation of the handle 64. It descends (see Fig. 2). Along with the lowering of the stem 63, the compressor 61 fixed to the end of the stem 63 is also lowered.

As the compressor 61 descends, the diaphragm 12 convexly curves toward the second surface 32 as shown in Fig. 8(b), and is pressed against the tip portion 33a of the wall portion 33.

Thereby, 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 according to the rotation of the handle 64. 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. 8(a).

Thereby, the flow path 24 of the diaphragm valve 10 is opened.

<3. Example>

Next, embodiments related to the present invention will be described using examples.

In the following embodiments, diaphragm valves 10 with L1 = L3, L2 = L4, and θ1 = θ2 are used.

9 is a table showing a pressure loss rate and a rate of speed change calculated by analyzing the valve body with L1/L2 changed. Note that the valve half length is half the length of the valve body 11, and in this embodiment, L2 = L4, so that the valve half length = L2, L4. Further, in Examples 1 to 8 and Comparative Examples 2 to 4 shown in Fig. 9, the inlet-side inflection point 36a is located at the tip portion 33a side than the inlet-side contact point 31d, and the outlet-side inflection point 38a is the outlet side. Although it is located at the tip portion 33a side than the contact point 31f, the inlet side inflection point 36a is located at the inlet 24a side (opposite to the tip portion 33a) than the inlet side contact point 31d, and the outlet side inflection point 38a It is the same result even if it is located in the exit 24b side (opposite the front end part 33a) from this exit side contact point 31f.

For the pressure loss rate, the case where the loss rate of the inlet 24a and the outlet 24b is 20% or less is set to good (○), and the case where the loss rate is 30% or less is set to normal (△), and the loss rate is more than 30% A large case is judged as defective (×). Moreover, for fluid analysis, a case where the rate of change in the speed in the diaphragm valve is 20% or less is set to good (○), a case where the rate of change in speed is 30% or less is set to (△), and a case where the rate of change in speed is greater than 30% is defective It is judged as (×).

In the diaphragm valve of Comparative Example 1, when (L1/L2) is 0, that is, the position of the inlet contact point 31d and the tip portion 33a in the arrow X direction coincides, and the outlet inflection point 38a This is the case where the positions of the outlet-side contact points 31f coincide, and both the pressure loss rate and the rate of speed change become defective, and the overall judgment becomes defective.

In the diaphragm valve of Comparative Example 2, when L1/L2 is 0.01 (1% in percent), the pressure loss rate is normal, but the rate of change in speed becomes poor, and the overall judgment becomes poor.

In the diaphragm valve of Comparative Example 3, when L1/L2 was 0.02 (2% in percent), both the pressure loss rate and the rate of speed change became normal, and the overall judgment became poor.

In the diaphragm valve of Example 1, when L1/L2 was 0.03 (3% as a percentage), the pressure loss rate was normal, the rate of change in speed was good, and the overall judgment was good.

In the diaphragm valve of Example 2, when L1/L2 was 0.04 (4% in percent), the pressure loss rate was normal, the rate of change in speed was good, and the overall judgment was good.

In the diaphragm valve of Example 3, when L1/L2 was 0.05 (5% in percent), the pressure loss rate was normal, the rate of change in speed was good, and the overall judgment was good.

In the diaphragm valve of Example 4, when L1/L2 was 0.10 (10% in percent), both the pressure loss rate and the rate of speed change became good, and the overall judgment was good.

In the diaphragm valve of Example 5, when L1/L2 was 0.20 (20% in percent), both the pressure loss rate and the rate of speed change became good, and the overall judgment was good.

In the diaphragm valve of Example 6, when L1/L2 was 0.30 (30% in percent), both the pressure loss rate and the rate of speed change became good, and the overall judgment was good.

In the diaphragm valve of Example 7, when L1/L2 was 0.40 (40% in percent), both the pressure loss rate and the rate of speed change became good, and the overall judgment was good.

In the diaphragm valve of Example 8, when L1/L2 was 0.45 (30% in percent), both the pressure loss rate and the rate of speed change became good, and the overall judgment was good.

In the diaphragm valve of Comparative Example 4, when L1/L2 is 0.50 (50% in percent), the pressure loss rate is normal, but the rate of change in speed becomes poor, and the overall judgment becomes poor.

From the above, it can be seen that good results can be obtained when 0.03 ≤ L1/L2 ≤ 0.45.

Next, the effects of the angle (θ1) (=θ2) and the inflection point will be described using Examples 9 and Comparative Examples 5 and 6.

10 is a cross-sectional view showing the structure of the valve body 1011 of Comparative Example 5. 10, the 2nd flow path formation surface 1036 of the 2nd surface 32 side of the inlet side flow path 1241 of the valve body 1011 is formed in a straight line, and this embodiment and The same inflection point is not formed. Further, similar to the second flow path forming surface 1036, the fourth flow path forming surface 1038 on the second surface 32 side of the outlet side flow passage 1242 of the valve body 1011 is formed in a straight line, No inflection point like this embodiment is formed. In Fig. 10, a wall portion 1033 and a tip portion 1033a are shown. In addition, the angle θ1 (=θ2) is set to 90°.

11 is a view showing a result of fluid analysis of the valve body 1011 of Comparative Example 5 of the above configuration. In Comparative Example 5, as shown in FIG. 11, it can be seen that the pressure is increasing in the inlet-side flow path 1241 and the pressure loss is large.

On the other hand, Fig. 12 is a view showing the results of fluid analysis of the valve body 11 of Example 9. In addition, the angle (θ1) (=θ2) = 90°. Further, L1/L2 = 0.38, which satisfies 0.03 ≤ L1/L2 ≤ 0.45.

In FIG. 12, it can be seen that the pressure in the inlet-side flow path 241 is reduced, and the pressure loss is suppressed.

Thereby, it turns out that pressure loss can be reduced by forming an inlet-side inflection point 36a and an outlet-side inflection point 38a.

13 is a view showing the results of fluid analysis of the valve body of Comparative Example 6. In the valve body of Comparative Example 6, unlike the valve body of Example 9, the angle θ1 (=θ2) = 91° is set. In Fig. 13, the contact points are shown as 1031d and 1031f. In Comparative Example 6, as shown in FIG. 13, it can be seen that the pressure is increasing in the inlet-side flow path 241 and the pressure loss is large.

Thus, it can be seen that the angle θ1 (=θ2) is preferably 90° or less.

As described above, as described in the embodiments and examples, by performing the above, not only the pressure loss is reduced, but also the transferability is improved and the moldability is improved by suppressing abrasion of the slurry or improving resin fluidity during injection molding. It has the effect of being. In addition, when the valve is closed, the stress is relieved when the load is loaded from the diaphragm, thereby improving strength and simplifying the driving portion of the injection mold, which also has the effect of being economical.

<4. Features, etc.>

(4-1)

The diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12 (an example of a valve portion), a bonnet 13 (an example of a cover portion), and a drive mechanism 14. The valve body 11 has a flow path 24, an opening 31a (an example of the opening), and a tip portion 33a (an example of the abutment). The flow path 24 connects the inlet 24a and the outlet 24b formed to face each other, and is formed inside. The opening 31a is formed in the middle of the flow path 24. The wall portion 33 is formed at a position corresponding to the opening 31a of the flow path 24. The diaphragm 12 is arranged to close the opening 31a, and the flow path 24 can be closed by contacting the wall portion 33. The bonnet 13 is fixed to the valve body 11 so as to cover the diaphragm 12. The drive mechanism 14 opens and closes the flow path 24 by driving the diaphragm 12. The flow path 24 has an inlet side flow path 241 formed from the inlet 24a to the tip portion 33a, and an outlet side flow path 242 formed from the tip portion 33a to the outlet 24b. When viewed from the cross section in the center of the width direction Y of the flow path 24, the inlet-side flow path 241 includes a first flow path forming surface 35 and an opening 31a formed on the opening 31a side. It is formed by the second flow path forming surface 36 formed on the opposite side. When viewed from the cross section of the second flow path forming surface 36, the inlet side inflection point 36a, which is the inflection point of the line, includes the inner circumferential surface 31c on the inlet 24a side of the opening 31a and the first flow path forming surface 35 Viewed from the cross-section of, it is disposed on the inlet 24a side or the outlet 24b side than the inlet-side contact point 31d (an example of the inlet-side intersection), which is the intersection point. The entrance-side contact point 31d is disposed on the opening 31a side than the entrance-side inflection point 36a. The angle θ1 when viewed from the cross section of the first flow path forming surface 35 forming the inlet contact point 31d and the inner circumferential surface 31c on the inlet 24a side of the opening 31a is 0°<θ ≤ 90° is satisfied.

Thus, when viewed from the side, the position of the inlet-side inflection point 36a in the direction X from the inlet 24a toward the outlet 24b is made different from the position of the inlet-side contact point 31d, and the angle θ1 ) Is set to be greater than 0° and 90° or less, so that the fluid can smoothly move even if the direction changes in the inlet-side flow path 241 from the inlet 24a to the tip portion 33a. For this reason, the load of the bonnet 13 and the diaphragm 12 provided from a fluid can be reduced, and pressure loss can be reduced.

(4-2)

In the diaphragm valve 10 of this embodiment, the length between the inlet-side inflection point 36a and the inlet-side contact point 31d (an example of the inlet-side intersection) in the direction from the inlet 24a to the outlet 24b is If L1, and the length from the inlet 24a to the tip portion 33a (an example of abutting portion) in the direction from the inlet 24a toward the outlet 24b is L2, 0.03 ≤ L1/L2 ≤ 0.45 Satisfies.

Thus, when L1 and L2 satisfy the said range, a pressure loss can be reduced.

(4-3)

In the diaphragm valve 10 of this embodiment, when viewed from the cross section in the center of the width direction Y of the flow path 24, the outlet-side flow path 242 forms a third flow path formed on the opening 31a side. It is formed by the surface 37 and the fourth flow path forming surface 38 formed on the side opposite to the opening 31a. The exit-side inflection point 38a, which is an inflection point of the line when viewed from the cross-section of the fourth flow-path forming surface 38, is a cross-section of the inner peripheral surface 31e and the third flow-path forming surface 37 on the exit side of the opening 31a. It is arranged on the inlet 24a side or the outlet 24b side from the exit-side contact point 31f (an example of the exit-side intersection), which is the intersection point when viewed. The exit-side contact point 31f is disposed on the opening 31a side than the exit-side inflection point 38a. The angle θ2 when viewed from the cross section of the third flow path forming surface 37 forming the outlet contact point 31f and the inner peripheral surface 31e on the outlet 24b side of the opening 31a is 0°<θ2 ≤ 90° is satisfied.

Thus, when viewed from the side, the position of the exit-side inflection point 38a in the direction from the inlet 24a toward the outlet 24b is different from that of the exit-side contact point 31f, and the angle θ2 is By setting the value to be greater than 0° and 90° or less, the fluid can move smoothly even if the direction changes in the outlet side flow passage 242 from the tip portion 33a to the outlet 24b. For this reason, the load of the bonnet 13 and the diaphragm 12 provided from a fluid can be reduced, and pressure loss can be reduced.

(4-4)

In the diaphragm valve 10 of the present embodiment, the length between the exit-side inflection point 38a and the exit-side contact point 31f (an example of the exit-side intersection) in the direction from the inlet 24a to the outlet 24b is If L3, and the length from the tip portion 33a (an example of abutting portion) in the direction X from the inlet 24a toward the outlet 24b to the outlet 24b is L4, 0.03 ≤ L3/L4 ≤ 0.4 Is satisfied.

Thus, when L3 and L4 satisfy the said range, a pressure loss can be reduced.

(4-5)

In the diaphragm valve 10 of this embodiment, the drive mechanism 14 includes a stem 63 (an example of a shaft member), a compressor 61 (an example of a pressing portion), and a handle 64 (an example of a driving portion). Have The stem 63 is supported by the bonnet 13 (an example of a cover portion). The compressor 61 is attached to the stem 63 and is also connected to the diaphragm 12 (an example of a valve portion). The handle 64 drives the stem 63. The handle 64 is manual.

Thus, the stem 63 can be driven manually, and the flow path 24 can be opened and closed.

[Other embodiments]

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention.

(A)

In the above embodiment, the shapes of the inlet-side flow path 241 and the outlet-side flow path 242 are symmetrical, but may not be symmetrical. That is, the exit inflection point 38a need not be formed, and even when the exit inflection point 38a is formed, the positions of the exit inflection point 38a and the exit contact point 31f are shifted in the direction of the arrow X. There is no need. In addition, it is not necessary to satisfy 0° <θ2 ≤ 90°.

(B)

In the diaphragm valve 10 of the above-described embodiment, the manual handle 64 is formed as an example of the drive portion, but the stem 63 may be driven by an air-driven or electric-driven drive portion.

(C)

Moreover, although described in the above embodiment, in the diaphragm valve 10 shown in Fig. 7, the inlet-side inflection point 36a is disposed at the tip end 33a side than the inlet-side contact point 31d, and the outlet-side inflection point 38a ) Although this is disposed on the tip portion 33a side than the outlet-side contact point 31f, it is not limited to this. For example, even if the inlet-side inflection point 36a is disposed at the inlet 24a side than the inlet-side contact point 31d, and the outlet-side inflection point 38a is disposed at the outlet 24b side than the outlet-side contact point 31f. do.

(D)

In the above-described embodiment, the second flow path forming surface 36 and the fourth flow path forming surface 38 are formed by two curves when viewed in the cross section of FIG. 7, but are not limited to this, and a straight portion is formed. It does not have to be, and in short, an inflection point should just be formed.

Industrial availability

The diaphragm valve of the present invention exerts an effect capable of reducing pressure loss, and is useful when used in a plant or the like.

10: diaphragm valve
24: Euro
24a: Entrance
24b: exit
31a: opening
31c: inner circumference
31d: Inlet contact point
35: first flow path forming surface
36: second flow path forming surface
36a: Entrance side inflection point

Claims (5)

A valve body having an inlet and an outlet formed facing each other, a flow path formed therein, an opening formed in the middle of the flow path, and a contact portion formed at a position corresponding to the opening of the flow path,
A valve portion disposed to close the opening, and capable of closing the flow path by contacting the abutting portion,
And a cover portion fixed to the valve body to cover the valve portion,
It is provided with a drive mechanism for opening and closing the flow path by driving the valve portion,
The flow path has an inlet side flow path formed from the inlet to the abutting portion, and an outlet side flow path formed from the abutting portion to the outlet,
When viewed from a cross section in the center of the width direction of the flow path, the inlet-side flow path is formed by a first flow path forming surface formed on the opening side and a second flow path forming surface formed on the opposite side to the opening,
The entrance-side inflection point, which is an inflection point of the line when viewed from the cross-section of the second flow path forming surface, is an incidence-side intersection that is an intersection point when viewed from the cross-section of the inlet-side inner peripheral surface of the opening and the first flow-path forming surface. It is more arranged on the inlet side or the outlet side,
The entrance-side intersection point is disposed on the opening side than the entrance-side inflection point,
The diaphragm valve satisfies an angle θ1 when viewed from the cross section of the first flow path forming surface forming the inlet intersection and the inner peripheral surface of the inlet side of the opening satisfying 0° <θ1 ≤ 90° . According to claim 1,
The length between the entrance-side inflection point and the entrance-side intersection in the direction from the entrance to the exit is L1, and the length from the entrance to the abutment in the direction from the entrance to the exit is When L2, diaphragm valve satisfying 0.03 ≤ L1/L2 ≤ 0.45. The method according to claim 1 or 2,
When viewed from the cross section in the center of the width direction of the flow path, the outlet-side flow path is formed by a third flow path forming surface formed on the opening side and a fourth flow path forming surface formed on the opposite side to the opening,
The exit-side inflection point, which is an inflection point of the line when viewed from the cross-section of the fourth flow-path forming surface, is an exit-side intersection point that is an intersection point when viewed from the end surface of the outlet-side inner circumferential surface and the third flow-path forming surface. It is more arranged on the inlet side or the outlet side,
The exit-side intersection point is disposed at the opening side than the exit-side inflection point,
The angle θ2 when viewed from the cross section of the third flow path forming surface forming the outlet-side intersection and the inner peripheral surface of the outlet side of the opening satisfies 0° <θ2 ≤ 90°, the diaphragm valve . The method of claim 3,
The length between the exit-side inflection point and the exit-side intersection in the direction from the entrance to the exit is L3, and the length from the abutment to the exit in the direction from the entrance to the exit is If L4, diaphragm valve satisfying 0.03 ≤ L3/L4 ≤ 0.4. The method according to any one of claims 1 to 4,
The drive mechanism,
An axial member supported on the cover part,
A pressing portion mounted on the shaft member and connected to the valve portion,
Has a driving unit for driving the shaft member,
The drive unit is a manual, air-driven, or electric-driven, diaphragm valve.

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