JP2019132377A - Diaphragm valve - Google Patents

Abstract

To provide a diaphragm valve capable of improving long-term performance.SOLUTION: In a diaphragm valve 10, a diaphragm bolt 65 connects a diaphragm 12 and a drive mechanism 14. The diaphragm bolt 65 has a columnar part 71 and an insertion part 72. The columnar part 71 is arranged along a driving direction Z of the diaphragm 12. The insertion part 72 is provided at a first end 71a (one example of ends) on a contact part 33a side of the columnar part 71, and is inserted into the diaphragm 12. When the maximum diameter of a columnar part 71 is defined as a, and the minimum diameter of the columnar part 71 is defined as b, 0.70≤b/a≤0.92 is satisfied. The position of the minimum diameter of the columnar part 71 is provided in the diaphragm 12 on the insertion part 72 side with respect to the position of the maximum diameter.SELECTED DRAWING: Figure 12C

Description

  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.

  A diaphragm valve is installed in a plant with pipes connected to 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 and FIG. 2).

  In the diaphragm valve shown in Patent Document 1, the diaphragm is held in the compressor using a diaphragm bolt, and the diaphragm is prevented from being displaced during the valve operation.

JP 2001-214981 A

  However, in the diaphragm valve shown in Patent Document 1, stress concentrates on the portion where the diaphragm bolt of the diaphragm is fastened, and thus the diaphragm may be cracked or the bolt may be dropped due to aging.

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

  In order to achieve the above object, a diaphragm valve according to a first invention includes a valve body, a valve portion, a drive mechanism, and a connecting 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 valve portion is disposed so as to close the opening, and can close the flow path by contacting the contact portion. The drive mechanism opens and closes the flow path by driving the valve portion. The connecting portion connects the valve portion and the drive mechanism. The connection part has a columnar part and an insertion part. The columnar part is disposed along the driving direction of the valve part. The insertion part is provided at the first end of the columnar part on the contact part side, and is inserted into the valve part. When the maximum diameter of the columnar part is a and the minimum diameter of the columnar part is b, 0.70 ≦ b / a ≦ 0.92 is satisfied. The position of the minimum diameter of the columnar part is provided on the insertion part side of the position of the maximum diameter and inside the valve part.

  Thus, by setting 0.70 ≦ b / a, the contact area between the connecting portion and the valve portion can be formed so as not to become too small. Can be suppressed.

  In addition, by setting b / a ≦ 0.92, the contact area between the connecting part and the valve part can be formed so as not to become too large, so that frictional resistance is suppressed and diaphragm cracks and bolts due to aging deterioration. Omission can be reduced.

As described above, long-term performance can be improved.
A diaphragm valve according to a second aspect of the invention is the diaphragm valve according to the first aspect of the invention, wherein the columnar part has a cylindrical part and an enlarged diameter part. The enlarged diameter portion is disposed on the insertion portion side of the cylindrical portion, and is enlarged in diameter from the first end toward the cylindrical portion. At least a part of the enlarged diameter portion is inserted into the valve portion. The diameter-expanded portion expands from the inside of the valve portion toward the cylindrical portion.

  Thereby, while reducing the contact area between a connection part and a valve part, the intensity | strength of a connection part is securable.

  A diaphragm valve according to a third aspect of the invention is the diaphragm valve according to the first aspect of the invention, wherein the columnar part has a cylindrical part and an enlarged diameter part. The enlarged diameter portion is disposed on the insertion portion side of the cylindrical portion, and is enlarged in diameter from the first end toward the cylindrical portion. The minimum diameter is the diameter of the first end of the expanded portion. The maximum diameter is the diameter of the second end on the cylindrical portion side of the enlarged diameter portion.

  Thereby, the diameter of the columnar part is the smallest at the first end where the insertion part is provided, and the diameter gradually increases as the distance from the insertion part increases. For this reason, while reducing the contact area between a connection part and a valve part, the intensity | strength of a connection part is securable.

  A diaphragm valve according to a fourth aspect of the present invention is the diaphragm valve according to the first aspect of the present invention, further comprising a lid. The lid portion is fixed to the valve body so as to cover the valve portion. The drive mechanism includes a shaft member, a pressing portion, and a drive portion. The shaft member is supported by the lid. The pressing portion presses the valve portion against the contact portion. The drive unit drives the shaft member. The drive unit is a manual type, an air drive type, or an electric drive type.

  Thus, it can be driven manually, by air or electricity, and the channel can be closed or opened.

  ADVANTAGE OF THE INVENTION According to this invention, the diaphragm valve which can improve long-term performance can be provided.

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 flow path direction of the flow path of the diaphragm valve of FIG. The figure which shows the relationship of the diaphragm of FIG. 1, a compressor, a stem, and a sleeve. (A) Bottom view of the diaphragm of FIG. 1, (b) A cross-sectional view taken along the line FF ′ of FIG. 10 (a). The bottom view of the compressor of FIG. The perspective view of the diaphragm bolt of FIG. FIG. 12B is a cross-sectional view taken along DD ′ in FIG. The side view of the diaphragm bolt of FIG. 12A. The top view which shows the positional relationship of the insertion part of the diaphragm bolt of FIG. 2, and a compressor. The top view which shows the positional relationship of the insertion part of the diaphragm bolt of FIG. 2, and a compressor. (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 which shows the table | surface of the result of having conducted the stress analysis of the diaphragm bolt and the diaphragm (diaphragm) about the diaphragm bolt of Examples 1-6 and Comparative Examples 1-3 which changed the value of a / b. The perspective view which shows the diaphragm volt | bolt of the modification in embodiment concerning this invention. FIG. 17B is a cross-sectional view taken along the line EE ′ in FIG. 17A. FIG. 17B is a side view of the diaphragm bolt of FIG. 17A.

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

<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 (also referred to as a diaphragm), 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 includes 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 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 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.

  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 central rib 34.

  As shown in FIG. 3, the first surface 31 has a substantially planar shape 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 moving direction of a stem 63, a compressor 61, or a diaphragm 12 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 described later is in pressure contact with the contact portion 33a that is the tip of the wall portion 33 on the first surface 31 side. As shown in FIG. 8, the contact portion 33 a is formed to be curved in a concave shape toward the opening 31 a in a plane perpendicular to the flow path direction X.

  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 channel 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 illustrated in FIG. 4, the second surface 32 includes 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. Central rib 34)
As shown in FIGS. 5 and 7, the central rib 34 is formed to protrude from the second surface 32 perpendicular to the first surface 31. As shown in FIG. 6, the central rib 34 has a first central rib 41 and a second central rib 42.

  As shown in FIGS. 5 and 7, the first central 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 central rib 41 is provided at the center of the central portion 23 in the second direction Y.

  As shown in FIG. 6, the second central 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 central rib 42 extends from one outer edge portion 39 to the other outer edge portion. Up to 39 are formed.

  As shown in FIG. 6, the first central rib 41 and the second central rib 42 intersect each other in a cross shape in a plan view at the central portion 43 that is the center of each.

(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.

  As shown in FIG. 2, the diaphragm 12 is disposed on the first surface 31 so as to close the opening 31a.

  FIG. 9 is a perspective view showing the diaphragm 12, a compressor 61, a sleeve 62, a stem 63 and the like which will be described later. FIG. 9 shows the central axis O of the diaphragm 12, the compressor 61, the sleeve 62, and the stem 63. The central axis O is perpendicular to the first surface 31 and coincides with the driving direction of the diaphragm 12, the compressor 61 and the stem 63 described later.

  10A is a bottom view of the diaphragm 12, and FIG. 10B is a cross-sectional view taken along the line FF ″ in FIG. 10A. As shown in FIGS. 10A and 10B, the diaphragm 12 has a diaphragm part 120 and an outer peripheral edge part 121. The diaphragm 120 is moved up and down by the drive mechanism 14. The diaphragm 120 has a circular shape and corresponds to the opening 31 a of the valve body 11. On the surface 120a on the contact portion 33a side of the diaphragm portion 120, a ridge portion 122 formed so as to protrude toward the contact portion 33a of the wall portion 33 of the valve body 11 is formed. The protruding portion 122 is formed along the second direction Y, and extends along the contact portion 33a. At the center of the surface 120b opposite to the surface 120a of the diaphragm 120, as shown in FIG. 8, a convex portion 124 protruding toward the bonnet 13 side is formed.

  The outer peripheral edge 121 is formed on the outer periphery of the diaphragm 120, and is sandwiched between the bonnet 13 and the valve body 11, which will be described later, as shown in FIG. As shown in FIG. 9A, four through holes 123 are formed in the outer peripheral edge 121. By inserting a bolt 100, which will be described later, into the through hole 123, the outer peripheral edge 121 of the diaphragm 12 is sandwiched between the bonnet 13 and the valve body 11 which will be described later, as shown in FIG.

  The diaphragm 12 is moved downward by a driving mechanism 14 to be 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. 2, the bonnet 13 is fixed to the first surface 31 of the valve body 11 with bolts 100 or the like. 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)
As shown in FIG. 2, the drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, a handle 64, and a diaphragm bolt 65.

(1-5-1. Compressor 61)
The compressor 61 is made of PVDF (polyvinylidene fluoride) or the like and is connected to the diaphragm 12. A diaphragm bolt 65 (described in detail later) is embedded in the diaphragm 12, and the diaphragm bolt 65 protrudes on the opposite side (non-wetted surface side) of the valve body 11. The protruding portion of the diaphragm bolt 65 is engaged with the compressor 61, and the compressor 61 and the diaphragm 12 are connected.

  FIG. 11 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 612a, 612b, 613a, 613b, 614a, 614b, 615a, 615b that protrude outward from the central portion 611. . An insertion hole 616 into which the diaphragm bolt 65 is inserted is formed in the central portion 611. The insertion hole 616 includes a circular hole 616a and a pair of cutouts 616b formed at the edge of the circular hole 616a. The pair of cutouts 616b includes a locking pin 73 of a diaphragm bolt 65 described later. Oppositely formed so as to be insertable.

  In FIG. 11, a plurality of protrusions 612a, 612b, 613a, 613b, 614a, 614b, 615a, 615b are formed at eight angles, and are formed at an equal angle (about 45 degrees). Opposite the diameter direction. That is, a pair of protrusions 612a and 612b are provided with a central part 611 sandwiched along a straight line passing through the central axis O of the circular hole 616a. In addition, a pair of protrusions 613a and 613b are provided across a central part 611 along a straight line passing through the central axis O of the circular hole 616a. In addition, a pair of protrusions 614a and protrusions 614b are provided with a central portion 611 sandwiched along a straight line passing through the central axis O of the circular hole 616a. In addition, a pair of projecting portions 615a and projecting portions 615b are provided across a central portion 611 along a straight line passing through the central axis O of the circular hole portion 616a.

  The protruding portions 612a, 612b, 614a, 614b protrude from the central portion 611 by the same length. The protruding portions 613a, 613b, 615a, 615b protrude from the central portion 611 by the same length. The lengths of the protruding portions 612a, 612b, 614a, and 614b are longer than the lengths of the protruding portions 613a, 613b, 615a, and 615b. The angle between the pair of protrusions 612a and 612b and the pair of protrusions 614a and 614b is formed to be approximately 90 degrees. The angle between the pair of protrusions 613a and 613b and the pair of protrusions 615a and 615b is formed to be approximately 90 degrees.

  As shown in FIG. 8, a concave portion 611 c is formed at the center of the surface of the central portion 611 of the compressor 61 on the contact portion 33 a side, and the convex portion 124 of the diaphragm 12 is inserted.

(1-5-2. Sleeve 62, stem 63, handle 64)
As shown in FIG. 2, the sleeve 62 is supported by the through hole 13 b of the bonnet 13. 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 peripheral portion of the portion of the stem 63 located outside the bonnet 13.

(1-5-3. Diaphragm bolt 65)
FIG. 12A is a perspective view showing the diaphragm bolt 65. 12B is a cross-sectional view taken along the line DD ′ in FIG. 12A. FIG. 12C is a side view of the diaphragm bolt 65. The diaphragm bolt 65 is made of, for example, metal, and connects the diaphragm 12 to the drive mechanism 14. One end of the diaphragm bolt 65 is embedded in the diaphragm 12, and the other end is locked to the compressor 61.

The diaphragm bolt 65 includes a columnar portion 71, an insertion portion 72, and a pair of locking pins 73.
The columnar portion 71 has a cylindrical shape and is disposed along the central axis O. Since the central axis O is along the driving direction of the diaphragm 12, the compressor 61 or the stem 63 (see FIGS. 15A and 15B described later), the columnar portion 71 is formed of the diaphragm 12, the compressor 61 or the stem. It can also be said that they are arranged along the driving direction 63.

  The columnar portion 71 has a first end 71a disposed on the diaphragm 12 side and a second end 71b disposed on the stem 63 side. The columnar part 71 has a cylindrical part 81 and an enlarged diameter part 82. The cylindrical portion 81 and the enlarged diameter portion 82 are disposed along the central axis O. The cylindrical portion 81 has a second end 71b. The enlarged diameter portion 82 is provided on the diaphragm 12 side (insertion portion 72 side) of the cylindrical portion 81 and has a first end 71a. The enlarged diameter portion 82 is formed in a truncated cone shape so that the diameter gradually increases from the first end 71 a toward the cylindrical portion 81. In FIG. 8, the entire enlarged diameter portion 82 is embedded in the diaphragm 12, but only a part may be embedded. The diameter of the third end 82a, which is the connection end of the expanded diameter portion 82 with the cylindrical portion 81, is the maximum diameter of the expanded diameter portion 82, and the diameter of the first end 71a of the expanded diameter portion 82 is the diameter of the expanded diameter portion 82. Minimum diameter. As shown in FIG. 12C, 0.70 ≦ b / a ≦ 0.92 is satisfied, where a is the maximum diameter of the enlarged diameter portion 82 and b is the minimum diameter of the enlarged diameter portion 82. These ranges will be described in detail in Examples. In addition, since the diameter of the cylindrical portion 81 is constant, it can be said that the maximum diameter of the expanded diameter portion 82 is the maximum diameter of the columnar portion 71, and the minimum diameter of the expanded diameter portion 82 is the minimum diameter of the columnar portion 71. It can be said.

  As shown in FIG. 8, the insertion part 72 is inserted into the convex part 124 of the diaphragm 12 by insert molding. As shown in FIGS. 12A and 12B, the insertion portion 72 includes a connection portion 91 and four protrusions 92a, 92b, 92c, and 92d. The connecting portion 91 is connected to the first end 71 a of the columnar portion 71. The four protruding portions 92a, 92b, 92c, and 92d protrude from the connecting portion 91 in the vertical direction with respect to the central axis O by the same length. In a plan view perpendicular to the central axis O, the four protruding portions 92a, 92b, 92c, and 92d are provided at intervals of 90 degrees, and the insertion portion 72 is arranged in a cross shape. A pair of projecting portions 92 a and projecting portions 92 c are arranged along a straight line La passing through the central axis O with the connecting portion 91 interposed therebetween. A pair of projecting portions 92 b and projecting portions 92 d are arranged along a straight line Lb passing through the central axis O with the connecting portion 91 interposed therebetween.

  The length from the tip 92ae of the protrusion 92a to the tip 92ce of the protrusion 92c is the same as the length from the tip 92be of the protrusion 92b to the tip 92de of the protrusion 92d.

  The pair of locking pins 73 are provided on the second end 71 b side of the columnar portion 71. The pair of locking pins 73 protrude from the side surfaces of the columnar portion 71 to opposite sides. The diaphragm bolt 65 is inserted into the insertion hole 616 from the second end 71b side so that the pair of locking pins 73 pass through the pair of notches 616b of the compressor 61. Thereafter, by rotating the diaphragm bolt 65 around the central axis O, the locking pin 73 is locked to the compressor 61 as shown in FIG.

  FIG. 13 is a view showing the positional relationship between the diaphragm 12 and the insertion portion 72 of the diaphragm bolt 65. As shown in FIG. 13, a pair of protruding portions 92 a and protruding portions 92 c arranged on a straight line are arranged along the protruding portion 122 of the diaphragm 12. In addition, a pair of protrusion part 92b and protrusion part 92d may be arrange | positioned along the protrusion part 122. FIG.

  FIG. 14 is a diagram showing the positional relationship between the compressor 61 and the insertion portion 72 of the diaphragm bolt 65. As shown in FIG. 14, the pair of protrusions 92 a and 92 c are arranged along a straight line L <b> 1 passing through the central axis O along the protrusion direction of the pair of protrusions 614 a and 614 b of the compressor 61. The pair of protrusions 92b and 92d are arranged along a straight line L2 passing through the central axis O along the protrusion direction of the pair of protrusions 612a and 612b of the compressor 61.

  As shown in FIGS. 13 and 14, the pair of protrusions 614 a and 614 b of the compressor 61 are disposed along the protrusion 122 of the diaphragm 12. Thus, by arranging the longer protrusions 614a and 614b along the ridge 122, the diaphragm 120 can be more closely attached to the abutment 33a. Since the longer protrusion may be used, the protrusions 612a and 612b may be disposed along the protrusion 122 instead of the protrusions 614a and 614b.

<2. Operation>
Next, the operation of the diaphragm valve 10 of the present embodiment will be described. FIG. 15A and FIG. 15B are diagrams schematically showing the operation of the diaphragm 12.

  When the handle 64 is rotated in a direction to close the flow channel 24 from the state where the flow channel 24 is open as shown in FIG. 15A, 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 curved convexly toward the second surface 32 as shown in FIG. 15B, and is pressed against the abutting 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. Example>
FIG. 16: shows the table | surface of the result of having performed the stress analysis about the diaphragm bolt and the diaphragm (diaphragm) in the case of using the diaphragm bolt of Examples 1-4 and Comparative Examples 1-3 which changed the value of b / a. FIG. In the stress analysis of the diaphragm bolt, it was judged as good (◯) when the stress was 150 MPa or less, and judged as poor (x) when the stress was larger than 150 MPa. Moreover, in the diaphragm stress analysis, when the stress was 85 MPa or less, it was judged as good (◯), and when the stress was greater than 85 MPa, it was judged as defective (x).

  In Comparative Example 1, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.65. In the stress analysis of the diaphragm bolt, the stress was 169 MPa, indicating a failure (x), and in the diaphragm stress analysis, the stress was 91 MPa, indicating a failure (x). Therefore, the overall judgment was defective (x).

  In Comparative Example 2, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.68. In the stress analysis of the diaphragm bolt, the stress was 158 MPa, indicating a failure (x), and in the diaphragm stress analysis, the stress was 86 MPa, indicating a failure (x). Therefore, the overall judgment was defective (x).

  In Example 1, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.70. In the stress analysis of the diaphragm bolt, the stress was 147 MPa, which was good (◯), and in the diaphragm stress analysis, the stress was 83 MPa, which was good (◯). Therefore, the overall judgment was good (◯).

  In Example 2, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.80. In the stress analysis of the diaphragm bolt, the stress was 139 MPa and good (◯), and in the diaphragm stress analysis, the stress was 69 MPa and good (◯). Therefore, the overall judgment was good (◯).

  In Example 3, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.90. In the stress analysis of the diaphragm bolt, the stress was 142 MPa and good (◯), and in the diaphragm stress analysis, the stress was 74 MPa and good (◯). Therefore, the overall judgment was good (◯).

  In Example 4, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.92. In the stress analysis of the diaphragm bolt, the stress was 146 MPa and good (◯), and in the diaphragm stress analysis, the stress was 80 MPa and good (◯). Therefore, the overall judgment was good (◯).

  In Comparative Example 3, stress analysis was performed on the diaphragm bolt and the diaphragm (diaphragm) using the diaphragm bolt set to b / a = 0.93. In the diaphragm stress analysis, the stress was 85 MPa, which was good (◯), but in the stress analysis of the diaphragm bolt, the stress was 154 MPa, which was poor (×). Therefore, the overall judgment was defective (x).

  From the above, it can be seen that when b / a is smaller than 0.70, the stress generated in both the diaphragm bolt and the diaphragm increases, and therefore it is preferable to set 0.70 ≦ b / a.

  In addition, when b / a is larger than 0.92, the stress generated in the diaphragm bolt increases, so it is understood that it is preferable to set b / a ≦ 0.92.

<4. Features>
(4-1)
The diaphragm valve 10 according to the present embodiment includes a valve main body 11, a diaphragm 12 (an example of a valve portion), a drive mechanism 14, and a diaphragm bolt 65 (an example of a connecting portion). The valve body 11 includes a flow path 24, an opening 31a, and a contact portion 33a. The flow path 24 is formed inside. The opening 31 a is formed in the middle of the flow path 24. The contact portion 33 a is provided at a position corresponding to the opening portion 31 a of the flow path 24. The diaphragm 12 is disposed so as to close the opening 31a, and can close the flow path 24 by contacting the contact portion 33a. The drive mechanism 14 opens and closes the flow path 24 by driving the diaphragm 12. The diaphragm bolt 65 connects the diaphragm 12 and the drive mechanism 14. The diaphragm bolt 65 has a columnar portion 71 and an insertion portion 72. The columnar portion 71 is disposed along the driving direction Z of the diaphragm 12. The insertion portion 72 is provided at a first end 71 a (an example of an end) on the contact portion 33 a side of the columnar portion 71, and is inserted into the diaphragm 12. When the maximum diameter of the columnar part 71 is a and the minimum diameter of the columnar part 71 is b, 0.70 ≦ b / a ≦ 0.92 is satisfied. The position of the minimum diameter of the columnar part 71 is provided in the diaphragm 12 on the side of the insertion part 72 from the position of the maximum diameter.

  Thus, by setting 0.70 ≦ b / a, the contact area between the diaphragm bolt 65 and the diaphragm 12 can be formed so as not to become too small. Therefore, the diaphragm bolt 65 is removed from the diaphragm 12 by the opening / closing operation of the flow path 24. It can be suppressed from coming off.

  In addition, by setting b / a ≦ 0.92, the contact area between the diaphragm bolt 65 and the diaphragm 12 can be formed so as not to become too large, thereby suppressing frictional resistance, Bolt dropout can be reduced.

As described above, long-term performance can be improved.
(4-2)
In the diaphragm valve 10 of the present embodiment, the columnar part 71 includes a cylindrical part 81 and a diameter-expanded part 82. The enlarged diameter portion 82 is disposed on the insertion portion 72 side of the cylindrical portion 81, and the diameter is increased from the first end 71 a toward the cylindrical portion 81. At least a part of the enlarged diameter portion 82 is inserted into the diaphragm 12 (an example of a valve portion). The expanded diameter portion 82 increases in diameter from the inside of the diaphragm 12 toward the cylindrical portion 81.

  Thereby, while reducing the contact area between the diaphragm bolt 65 and the diaphragm 12, the intensity | strength of the diaphragm bolt 65 is also securable.

(4-3)
In the diaphragm valve 10 of the present embodiment, the columnar part 71 includes a cylindrical part 81 and a diameter-expanded part 82. The enlarged diameter portion 82 is disposed on the insertion portion 72 side of the cylindrical portion 81, and the diameter is increased from the first end 71 a toward the cylindrical portion 81. The minimum diameter is the diameter of the first end 71 a of the enlarged diameter portion 82. The maximum diameter is the diameter of the third end 82a (an example of the second end) on the cylindrical portion 81 side of the enlarged diameter portion 82.

  Thereby, the columnar portion 71 has the smallest diameter at the first end 71 a where the insertion portion 72 is provided, and gradually increases in diameter as the distance from the insertion portion 72 increases. For this reason, while reducing the contact area between the diaphragm bolt 65 and the diaphragm 12, the intensity | strength of the diaphragm bolt 65 is securable.

(4-4)
The diaphragm valve 10 of the present embodiment further includes a bonnet 13 (an example of a lid). The bonnet 13 is fixed to the valve body 11 so as to cover the diaphragm 12 (an example of the valve portion). The drive mechanism 14 includes a stem 63 (an example of a shaft member), a compressor 61 (an example of a pressing unit), and a handle 64 (an example of a drive unit). The stem 63 is supported by the bonnet 13. The compressor 61 presses the diaphragm 12 against the contact portion 33a. The handle 64 drives the stem 63. The handle 64 is a manual type.

  In this way, it can be driven manually and the flow path 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 embodiment, the diaphragm bolt 65 is provided with the enlarged diameter portion 82 whose diameter gradually increases. However, the enlarged diameter portion 82 is not provided, and the diaphragm bolt 65 suddenly increases from the minimum diameter to the maximum diameter. A step may be formed on the surface.

(B)
In the above-described embodiment, the position of the minimum diameter of the columnar portion 71 is the first end 71a, and the position of the maximum diameter is the third end 82a. A portion having a larger diameter than the first end 71a may be formed between the 71a and the insertion portion 72, or a portion having a smaller diameter than the third end 72a is formed between the third end 72a and the cylindrical portion 81. May be.

(C)
In the above embodiment, the four projections 92a, 92b, 92c, and 92d are formed in the insertion portion 72 of the diaphragm bolt 65, but the present invention is not limited to this. However, it is preferable to provide at least two protrusions 92a and 92c along the protrusion 122 of the diaphragm 12 from the viewpoint of bringing the protrusion 122 into close contact with the contact portion 33a.

(D)
In the above embodiment, the four projecting portions 92a, 92b, 92c, and 92d are formed so that the insertion portion 72 of the diaphragm bolt 65 has a cross shape in plan view, but the present invention is not limited thereto. For example, as shown in a diaphragm bolt 65 ′ in FIG. 17A, a disc-shaped insertion portion 72 ′ may be disposed at the first end 71 a of the columnar portion 71. As shown in FIG. 17B, which is a cross-sectional view taken along the line EE ′ of FIG.

  Further, as shown in FIG. 17B, the disc-shaped insertion portion 72 ′ includes a connection portion 91 ′ connected to the first end 71 a of the columnar portion 71 and a direction perpendicular to the central axis O from the connection portion 91 ′. It can be said that it has an annular projecting portion 92 ′ formed so as to project in the direction. The insertion portion 72 'is inserted into the diaphragm 12 by insert molding. Further, as shown in FIG. 17C, the surface 72a ′ on the opposite side to the enlarged diameter portion 82 of the insertion portion 72 ′ is formed so as to be convexly curved toward the opposite side to the enlarged diameter portion 82. For example, it may be a horizontal plane. Further, the insertion portion 72 ′ has a circular shape in a plan view perpendicular to the central axis O, but is not limited thereto, and may be an elliptical shape.

  Accordingly, it is possible to suppress the separation of the diaphragm bolt 65 from the diaphragm 12, and to make the protrusion 122 contact with the contact portion 33a.

  Such a circular insertion portion 72 ′ is preferably used when the diaphragm 12 is formed of PTFE. The cross-shaped insertion portion 72 described in the above embodiment is preferably used when the diaphragm 12 is formed of EPDM. The reason why the insertion portion 72 is formed in a complicated shape with the protrusions as described above is that EPDM is not firmly bonded to the insertion portion 72 and is more slippery. On the other hand, in the case of PTFE, since it is hard to slip compared with EPDM, circular insertion part 72 'can be used.

(E)
In the above embodiment, the diaphragm bolt 65 is locked to the compressor 61 by the locking pin 73, but the connecting method to the compressor 61 is not limited to the locking pin 73. Even if the locking pin 73 is not provided, a screw shape is formed around the second end 71b of the diaphragm bolt 65 and the recess 611c of the compressor 61, and the diaphragm bolt 65 is connected to the compressor 61 by screwing. Good.

(F)
In the above-described embodiment, the eight protrusions 612a, 612b, 613a, 613b, 614a, 614b, 615a, and 615b are provided, but the present invention is not limited thereto. For example, when the size of the compressor 61 is small, the shorter protrusions 613a, 613b, 615a, and 615b may not be provided. Furthermore, the protrusions 612a and 612b that do not extend along the protrusion 122 may not be provided.

(G)
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 long-term performance and can be used in a plant or the like.

DESCRIPTION OF SYMBOLS 10: Diaphragm valve 12: Diaphragm 14: Drive mechanism 24: Flow path 31a: Opening part 33a: Contact part 61: Compressor 65: Diaphragm bolt 71: Columnar part 71a: 1st end 72: Insertion part

Claims (4)

A valve body having 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;
A valve portion that is arranged so as to close the opening and can close the flow path by contacting the contact portion;
A drive mechanism that opens and closes the flow path by driving the valve portion;
A connecting portion for connecting the valve portion and the drive mechanism,
The connecting portion is
A columnar portion disposed along the driving direction of the valve portion;
An insertion portion provided at a first end of the columnar portion on the contact portion side and inserted into the valve portion;
When the maximum diameter of the columnar part is a and the minimum diameter of the columnar part is b, 0.70 ≦ b / a ≦ 0.92 is satisfied,
The position of the minimum diameter of the columnar part is provided in the valve part on the insertion part side than the position of the maximum diameter,
Diaphragm valve. The columnar part is
A cylindrical part;
A diameter-expanded portion disposed on the insertion portion side of the columnar portion and having a diameter expanded from the first end toward the columnar portion;
Have
At least a part of the enlarged diameter portion is inserted into the valve portion,
The diameter-expanding portion expands from the inside of the valve portion toward the cylindrical portion,
The diaphragm valve according to claim 1. The columnar part is
A cylindrical part;
A diameter-expanded portion disposed on the insertion portion side of the columnar portion and having a diameter expanded from the first end toward the columnar portion;
Have
The minimum diameter is a diameter of the first end of the enlarged diameter portion,
The maximum diameter is a diameter of a second end of the expanded diameter portion on the cylindrical portion side.
The diaphragm valve according to claim 1. A lid portion fixed to the valve body so as to cover the valve portion;
The drive mechanism includes a shaft member supported by the lid;
A pressing portion that presses the valve portion against the contact portion;
A drive unit for driving the shaft member,
The driving unit is a manual type, an air driving type, or an electric driving type.
The diaphragm valve according to claim 1.

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