JP2022087724A - Diaphragm valve - Google Patents

Abstract

To provide a diaphragm valve which is improved in strength against repeated opening and closing by avoiding stress concentration on a bent portion.SOLUTION: A diaphragm valve 10 includes a body 11, a diaphragm 12, and a bonnet 13. The body 11 has a contact portion 33a provided in a flow path 24 formed inside, and an opening portion 31a formed to face the contact portion 33a. The diaphragm 12 is located on the body 11 to close the opening 31a, and closes the flow path 24 by coming into contact with the contact portion 33a. The bonnet 13 has a fixing portion 132 that sandwiches an outer peripheral edge portion 42 of the diaphragm 12 with the body 11, and is located to cover the diaphragm 12. The diaphragm 12 has the outer peripheral edge portion 42 and a bent portion 47 that is connected to the outer peripheral edge portion 42, is located inside the outer peripheral edge portion 42 and bends when the flow path 24 is opened or closed. The continuous portion 48 between the outer peripheral edge portion 42 and the bent portion 47 is located inside the fixing portion 132 of the bonnet 13.SELECTED DRAWING: Figure 8

Description

The present disclosure relates to diaphragm valves.

Piping lines in plants for water treatment, chemicals, food, etc. are provided with diaphragm valves, and the diaphragm valves control the fluid flowing through the pipes.

The diaphragm valve is installed in the plant with pipes connected at both ends. In the diaphragm valve, the flow path is closed when the diaphragm is pressed against the curved surface of the partition wall, and the flow path is opened when the diaphragm is separated from the partition wall.

The diaphragm is fixed by sandwiching the outer peripheral edge portion between the body and the bonnet, and the inner portion of the outer peripheral edge portion bends and drives to open and close the flow path (see, for example, Patent Document 1).

FIG. 16 is a partial cross-sectional view of the conventional diaphragm valve 1010. In the diaphragm valve 1010, the outer peripheral edge portion 1042 of the diaphragm 1012 is sandwiched between the body 1011 and the bonnet 1013. In FIG. 16, the diaphragm 1012 when the flow path is opened is shown by a solid line, and the diaphragm 1012 when the flow path is closed is shown by a two-dot chain line. As shown in FIG. 16, the bent portion 1043 inside the outer peripheral edge portion 1042 is deformed to open and close the flow path.

Japanese Unexamined Patent Publication No. 2017-180797

However, since the continuous portion 1044 (indicated by the dotted line) connecting the outer peripheral edge portion 1042 of the diaphragm 1012 and the bent portion 1043 is arranged at the same position as the 1013e edge of the bonnet 1013, the bent portion 1043 is formed when the flow path is opened or closed. The stress was concentrated and the diaphragm 1012 may be damaged when it was repeatedly opened and closed.

This is because when the diaphragm 1012 is sandwiched between the body 1011 and the bonnet 1013, the diaphragm 1012 flows inward, and further bending starts from the end of the portion sandwiched between the body 1011 and the bonnet 1013, so that stress is concentrated on the bending portion 1043. This is because it is easier to do.

An object of the present disclosure is to provide a diaphragm valve capable of avoiding stress concentration on a bent portion and improving the strength against repeated opening and closing.

The diaphragm valve according to the first disclosure includes a valve body, a diaphragm, and a lid portion. The valve body has a contact portion provided in the flow path formed inside and an opening formed so as to face the contact portion. The diaphragm is arranged in the valve body so as to close the opening, and closes the flow path by contacting the contact portion. The lid portion has a holding portion that sandwiches the peripheral edge portion of the diaphragm between the valve body and the valve body, and is arranged so as to cover the diaphragm. The diaphragm has a peripheral edge portion and a bent portion that is connected to the peripheral edge portion and is arranged inside the peripheral edge portion and bends when the flow path is opened or closed. The continuous portion of the peripheral portion and the bent portion is arranged inside the sandwiching portion of the lid portion.

In this way, the continuous portion connecting the peripheral edge portion and the bent portion of the diaphragm is arranged inside the sandwiching portion of the lid portion. As a result, the stress concentration is dispersed from the bent portion to the peripheral portion during repeated opening and closing, so that it is possible to prevent the stress from being concentrated on the bent portion of the diaphragm.

In order to improve the durability of the diaphragm, it is conceivable to increase the wall thickness, but since the thrust required at the time of stopping the water increases, there is a possibility that the diaphragm may be destroyed due to the increase in stress. Further, in order to increase the force for pinching the peripheral portion, it is conceivable to raise the weir portion from the valve body to the peripheral portion, but in that case, the pressure loss when a fluid such as water flows increases. However, it leads to an increase in the CV value.

On the other hand, in the configuration of the present disclosure, it is possible to suppress an increase in pressure loss and improve the durability of the diaphragm.

The diaphragm valve according to the second disclosure is the diaphragm valve according to the first disclosure, and the lid portion has an opening surrounded by the sandwiching portion. The continuous portion is arranged at a distance of 80% to 95% of the radius of the opening from the center of the opening.

As a result, the stress concentration is dispersed from the bent portion to the peripheral portion, so that the stress concentration can be avoided.

The diaphragm valve according to the third disclosure is the diaphragm valve according to the first or second disclosure, further comprising a drive mechanism for driving the diaphragm. The diaphragm further has a connecting part. The connecting portion is connected to the bent portion and is arranged inside the bent portion, and the connecting member of the drive mechanism is fixed. As a result, the stress concentration is dispersed from the bent portion to the peripheral portion, so that the stress concentration is avoided. Can be done.

The diaphragm valve according to the fourth disclosure is the diaphragm valve according to the third disclosure, and the peripheral edge portion and the connecting portion are formed in parallel with the opening portion.

By providing the bent portion between the peripheral edge portion and the connecting portion formed in parallel with the opening portion in this way, the bending becomes loose, so that the water stopping force can be reduced. As a result, the stress becomes small, and the stress concentration on the bent portion can be suppressed.

The diaphragm valve according to the fifth disclosure is the diaphragm valve according to the third or fourth disclosure, and the drive mechanism includes a compressor, a stem, and a sleeve. The compressor is located inside the lid and presses against the diaphragm. The stem is fixed to the compressor. The sleeve is fixed to the lid and screwed to the stem. The lid portion further has a lid body. The lid body forms a space for the compressor to move and is arranged from the inner end of the pinch to the opposite side of the valve body.

This allows the compressor to be moved to drive the diaphragm.

According to the present disclosure, it is possible to provide a diaphragm valve capable of avoiding stress concentration on a bent portion and improving the strength against repeated opening and closing.

FIG. 3 is a perspective view of a diaphragm valve using the flow path structure of the embodiment according to the present disclosure. FIG. 1 is a partial cross-sectional view of the diaphragm valve of FIG. FIG. 1 is a cross-sectional view of the diaphragm valve of FIG. A perspective view of the body of FIG. 1 as viewed from above. (A) A cross-sectional view taken along the line between EEs in FIG. 3 and (b) an enlarged view of a portion F in FIG. 4 (a). 2A and 2B are diagrams showing the relationship between the diaphragm, compressor, stem and sleeve. FIG. 2A is a perspective view of the diaphragm of FIG. 2A as viewed from the back side. (A) Bottom view of the diaphragm of FIG. 6, (b) Cross-sectional view taken along the line between GG'in FIG. 7 (a). FIG. 2B is an enlarged view of part K. (A) A plan view showing the vicinity of the opening of the body of FIG. 3, and (b) a plan view showing a state in which a diaphragm is placed on the body of FIG. 9 (a). FIG. 8 is an enlarged view of part N in FIG. (A) A perspective view of the bonnet of FIG. 1 as viewed from above, and (b) a perspective view of the bonnet of FIG. 11 (a) as viewed from below. (A) Bottom view of the compressor of FIG. 2A, (b) Cross-sectional view taken along the line between CC'in FIG. 12 (a). (A) A schematic cross-sectional view showing a state in which the flow path is closed, and (b) a schematic cross-sectional view showing a state in which the flow path is open. The cross-sectional view which shows the structure of the body of the modification of embodiment which concerns on this disclosure. The perspective view which looked at the diaphragm of the modification of the embodiment which concerns on this disclosure from the back side. A cross-sectional view showing the vicinity of the outer peripheral edge of the diaphragm in a conventional diaphragm valve.

Hereinafter, the diaphragm valve according to the embodiment according to the present disclosure will be described.

<Structure>
(Overview of diaphragm valve)
FIG. 1 is an external perspective view of the diaphragm valve 10 of the first embodiment according to the present disclosure. FIG. 2A is a partial cross-sectional configuration diagram of the diaphragm valve 10 of the present embodiment. FIG. 2B is a cross-sectional view of the diaphragm valve 10 of the present embodiment. FIG. 2B shows the central axis O of the diaphragm valve 10.

As shown in FIGS. 1, 2A and 2B, the diaphragm valve 10 of the present embodiment includes a body 11 (an example of a valve body), a diaphragm 12, a bonnet 13 (an example of a lid), and a drive mechanism 14. And have. Piping is connected to both ends of the body 11, and a flow path 24 through which a fluid flows is formed in the body 11. The diaphragm 12 opens or blocks the flow path 24. The bonnet 13 is attached to the body 11 so as to cover the diaphragm 12. A part of the drive mechanism 14 is arranged in the bonnet 13 and drives the diaphragm 12.

(Body 11)
FIG. 3 is a perspective view of the body 11 as viewed from the first surface 31 side, which will be described later. FIG. 4A is a cross-sectional view taken along the line of the body 11 between the EEs of FIG. FIG. 4 (b) is an enlarged view of the F portion of FIG. 4 (a).

The body 11 is made of PVC (polyvinyl chloride), HT (heat resistant vinyl chloride tube), PP (polypropylene), or PVCF (polyfluorinated bunylidene), 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 body 11 has a first end portion 21, a second end portion 22, a central portion 23, and a flow path 24.

The first end portion 21, the second end portion 22, and the central portion 23 are integrally formed, and the flow path 24 has the first end portion 21, the central portion 23, and the central portion 23 as shown in FIG. 4 (a). It is formed over the second end 22.

(1st end 21, 2nd end 22)
As shown in FIGS. 3 and 4A, 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 has a flange 213 in which an inlet 24a through which a fluid flows into the body 11 is formed, and a pipe can be connected to the first end portion 21.

Further, as shown in FIG. 4A, the second end portion 22 has a flange 223 formed with an outlet 24b through which a fluid is discharged from the body 11, and a pipe can be connected to the second end portion 22.

The flange 213 and the flange 223 are formed so as to face each other and be parallel to each other. Further, the position of the inlet 24a and the position of the exit 24b also face each other. The flange 213 and the flange 223 may be separate parts from the body 11.

The direction along the line connecting the inlet 24a and the outlet 24b is defined as the first direction X (which can also be said to be the fluid flow direction X), and the direction perpendicular to the first direction X and parallel to the first surface 31 is the second. The direction Y (which can also be said to be the width direction Y). The first direction X can be said to be a direction along a straight line perpendicular to the flange 213 and the flange 223. Further, the moving direction of the stem 63, the compressor 61, or the diaphragm 12, which will be described later, is indicated by an arrow Z (direction perpendicular to the first direction X and the second direction Y).

(Central part 23)
As shown in FIG. 3, the central 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 (see FIG. 4A), a wall portion 33 (see FIG. 4A), an edge rib 34, a rib 35, and a plurality of bolts. It has a hole 37.

As shown in FIG. 3, the first surface 31 is substantially planar and is formed perpendicular to the circular side surfaces of the flange 213 and the flange 223. An opening 31a is formed in the center of the first surface 31. The peripheral edge of the opening 31a is formed in a circular shape.

The edge rib 34 has a rectangular cross-section as shown in FIGS. 3, 4 (a) and 4 (b), and projects upward (upward in the Z direction) from the first surface 31 along the edge of the opening 31a. Is formed. As shown in FIG. 3, the edge rib 34 has a first rib portion 341 and a second rib portion 342. The first rib portion 341 is formed in an arc shape along the edge of the opening 31a in a plan view. The second rib portion 342 is formed in an arc shape along the edge of the opening 31a in a plan view. A predetermined distance 34a is provided between both ends of the arc-shaped first rib portion 341 and both ends of the arc-shaped second rib portion 342. The distances 34a between the two are of equal length and are provided so as to face each other in the width direction Y. The central rib 43 of the diaphragm 12, which will be described later, passes through the gap 34a when the diaphragm 12 is arranged on the body 11.

As shown in FIG. 10 described later, the rib 35 is formed so as to project upward (upward in the Z direction) from the first surface 31 so as to be along the outer periphery of the diaphragm 12 with a slight gap (FIG. 3, FIG. 4 (b)). The rib 35 is formed over the entire edge of the opening 31a and has a substantially circular shape.

Seen from above, the rib 35 has a circular portion 351 and a protruding portion 352, as shown in FIG. The circular portion 351 is formed along the rib 35 on the outside of the opening 31a at a predetermined distance from the edge rib 34. The protruding shape portion 352 projects outward from the circular shape portion 351 and is formed so as to trace a substantially square outer circumference. Inside the protruding shape portion 352, a protruding portion 45 of the diaphragm 12 shown in FIG. 5 to be described later is arranged.

As shown in FIG. 4B, the first surface 31 has a mounting surface 311 on which the outer peripheral edge portion 42 (described later) of the diaphragm 12 is placed between the rib 35 and the edge rib 34.

Four bolt holes 37 are formed around the opening 31a of the first surface 31 and outside the rib 35 in the Y direction, and the bolt holes 134 of the bonnet 13 described later (see FIG. 11B). The bolt 100 (see FIG. 1) is inserted so as to face the bonnet 13, and the bonnet 13 is fixed to the body 11.

As shown in FIG. 4A, 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 of the central portion 23 opposite to the side on which the bonnet 13 is arranged.

(Flow path 24)
As shown in FIG. 4A, the flow path 24 is formed from the inlet 24a to the outlet 24b. The wall portion 33 is formed in the center of the flow path 24 so as to project toward the first surface 31. The wall portion 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 provided in the middle of the flow path 24. Further, the opening 31a is formed at a position corresponding to the wall portion 33.

The diaphragm 12, which will be described later, is in pressure contact with the contact portion 33a, which is the tip of the wall portion 33 on the first surface 31 side. As shown in FIGS. 2A and 3, the contact portion 33a is formed so as to be concavely curved toward the opening 31a in a plane perpendicular to the flow direction X.

As shown in FIG. 4A, the flow path 24 is contacted from the inlet side flow path 241 formed from the inlet 24a of the first end portion 21 to the contact portion 33a and the outlet 24b of the second end portion 22. It has an outlet-side flow path 242 formed up to the contact portion 33a, and a communication portion 243 that communicates the inlet-side flow path 241 and the outlet-side flow path 242.

The inner peripheral surface of the inlet side flow path 241 is curved, and as shown in FIG. 4A, the width of the inlet side flow path 241 in the direction perpendicular to the first surface 31 (driving direction Z) is the wall portion 33. It gets narrower as you go. 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. 4A) becomes wider toward the wall portion 33.

The outlet side flow path 242 is formed with its inner peripheral surface curved, and as shown in FIG. 4A, the width in the direction perpendicular to the first surface 31 becomes narrower toward the wall portion 33. There is. 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. 4A) becomes wider toward the wall portion 33.

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

As shown in FIG. 4A, 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. The inlet side curved portion 321 and the exit side curved portion 322 form a protrusion of the wall portion 33 shown in FIG. 4A toward the first surface 31 side.

The second surface 32 is provided with a reinforcing rib 38 (see FIG. 4A).

(Septum 12)
The outer edge of the diaphragm 12 is sandwiched and fixed between the body 11 and the bonnet 13. The central portion of the diaphragm 12 moves downward by the drive mechanism 14 described later, and abuts on the contact portion 33a of the wall portion 33 to close the communication portion 243 and close the flow path 24. Further, the central portion of the diaphragm 12 is moved upward by the drive mechanism 14, and the diaphragm 12 is separated from the contact portion 33a, so that the flow path 24 is opened.

The material of the diaphragm 12 may be any rubber-like elastic body, and is not particularly limited. For example, ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulphonized rubber, nitrile rubber, styrene butadiene rubber, chlorinated polyethylene, fluororubber, EPDM (ethylene / propylene / diene rubber), PTFE (polytetrafluoroethylene) and the like are suitable. It is mentioned as a material. Further, a reinforcing cloth having high strength may be inserted into the diaphragm 12, and it is desirable that the reinforcing cloth is made of nylon. This is preferable because it is possible to prevent the diaphragm 12 from being deformed or damaged when a fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed. In this embodiment, it is preferable that the diaphragm 12 is formed by EPDM.

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

FIG. 5 is a perspective view showing the diaphragm 12, the compressor 61, the sleeve 62, the stem 63, and the like, which will be described later. FIG. 5 shows the state of the diaphragm 12 when the flow path 24 is closed. FIG. 5 shows the central axis O of the diaphragm 12, the compressor 61, the sleeve 62 and the stem 63. This central axis O is perpendicular to the first surface 31 and coincides with the central axis O in FIG. 2 and coincides with the drive direction (Z direction) of the diaphragm 12, the compressor 61 and the stem 63 described later.

FIG. 6 is a perspective view of the diaphragm 12 as viewed from the back side (body 11 side). FIG. 7A is a back view of the diaphragm 12 as viewed from the back side (body 11 side). 7 (b) is a cross-sectional view taken along the line between GG'in FIG. 7 (a). FIG. 8 is an enlarged view of the K portion of FIG. 2B. In FIG. 8, the diaphragm 12 in the state where the flow path 24 is open is shown by a solid line, and the diaphragm 12 in the state where the flow path 24 is closed is shown by a two-dot chain line. In FIG. 8, the diaphragm 12 is not hatched in order to show the diaphragm 12 in a state where the flow path 24 is closed.

As shown in FIGS. 6, 7 (a) and 7 (b), the diaphragm 12 includes a diaphragm portion 41 which is a central portion thereof, an outer peripheral edge portion 42 (an example of a peripheral edge portion), and a central rib 43. It has a peripheral rib 44 (an example of a convex portion) and a protruding portion 45.

The diaphragm portion 41 is moved up and down by a drive mechanism 14 described later. The diaphragm portion 41 is a partial sphere having a circular shape when viewed from above, and corresponds to the opening portion 31a of the body 11. As shown in FIGS. 6 and 7 (b), the surface 41a on the contact portion 33a side of the diaphragm portion 41 projects toward the contact portion 33a of the wall portion 33 of the body 11 and has a ridge having a rectangular cross section. The central rib 43 is formed. The central rib 43 is formed at a position having the diameter of the circular diaphragm portion 41 along the second direction Y, and is formed along the contact portion 33a. As shown in FIG. 7A, the central rib 43 passes through the surface 42a of the outer peripheral edge portion 42 at both ends in the width direction (longitudinal direction) and intersects the peripheral edge rib 44. When the diaphragm 12 is placed on the body 11, the central rib 43 is arranged through the interval 34a (see FIG. 3).

The diaphragm portion 41 has a bolt support portion 46 (an example of a fixing portion) and a bent portion 47. The bolt support portion 46 is arranged in the center of the diaphragm portion 41 as shown in FIGS. 6 and 7 (b). The bolt support portion 46 is formed in a flat shape. The bolt support portion 46 is formed in parallel with the opening portion 31a. The bolt support portion 46 is formed in parallel with the mounting surface 311.

The bolt support portion 46 is a thick portion and projects toward the bonnet 13 side. As shown in FIG. 7B, a diaphragm bolt 65, which will be described later, is inserted into the bolt support portion 46. The bolt support portion 46 is a portion of the diaphragm 12 that is substantially not deformed when the diaphragm 12 is driven for opening and closing (see FIG. 8).

The bent portion 47 is arranged around the bolt support portion 46. The bent portion 47 is a portion of the diaphragm 12 that bends when the diaphragm 12 is driven for opening and closing (see FIG. 8). The bent portion 47 has a partial spherical shape. If the curved surface is smooth as a whole, the curvature of the bent portion 47 does not have to be a constant value. The bent portion 47 and the bolt support portion 46 are gently continuous so as not to form a crease when the diaphragm 12 is opened and closed. The angle (angle X) formed at the boundary between the bent portion 47 and the bolt support portion 46 is from 0 degrees to at most 15 degrees.

The outer peripheral edge portion 42 is arranged outside the bent portion 47. The outer peripheral edge portion 42 has an annular shape and is formed in a collar shape so as to extend horizontally on the outer periphery of the diaphragm portion 41. The angle formed at the boundary between the bent portion 47 and the outer peripheral edge portion 42 is larger than the above angle X. As shown in FIG. 8, the outer peripheral edge portion 42 is sandwiched and fixed by the bonnet 13 and the body 11 on the outer edge side thereof. The outer peripheral edge portion 42 is formed in a flat shape. The outer peripheral edge portion 42 is formed in parallel with the opening portion 31a. The outer peripheral edge portion 42 is formed in parallel with the mounting surface 311. The outer peripheral edge portion 42 is a portion of the diaphragm 12 that is substantially not deformed when the diaphragm 12 is driven for opening and closing (see FIG. 8). The outer peripheral edge portion 42 is preferably at least partially thicker than the bent portion 47.

A bent portion 47 is arranged inside the outer peripheral edge portion 42 so as to be connected to the outer peripheral edge portion 42. A bolt support portion 46 is arranged inside the bent portion 47 so as to be connected to the bent portion 47. As shown in FIG. 8, the continuous portion 48 connected from the outer peripheral edge portion 42 to the bent portion 47 is arranged inside the inner end 132e of the fixed portion 132 of the bonnet 13 (details will be described later).

As described above, by providing the bent portion 47 between the outer peripheral edge portion 42 formed in a flat shape and the bolt support portion 46 (an example of the connecting portion), the bending is loosened, so that the water stopping force can be small. As a result, the stress becomes small, and the stress concentration on the bent portion can be suppressed.

As shown in FIGS. 7 (a) and 7 (b), the projecting portion 45 has a substantially quadrangular shape, and is formed so as to project from the outer peripheral edge portion 42 toward the outside in the horizontal direction. The protruding direction is orthogonal to the extension direction (longitudinal direction) of the central rib 43.

As shown in FIGS. 7 (a) and 7 (b), the peripheral edge rib 44 is formed on the surface 42 a of the outer peripheral edge portion 42 on the body 11 side along the circumferential direction, and is formed in FIG. As shown, it abuts on the mounting surface 311.

As shown in FIG. 7B, the peripheral edge rib 44 is provided inside the surface 42a at a predetermined distance from the end surface 42c on the outer peripheral side of the outer peripheral edge portion 42. The surface 42a has a first surface portion 42a1 on the inner peripheral side of the peripheral rib 44 and a second surface portion 42a2 on the outer peripheral side of the peripheral rib 44.

FIG. 9A is a plan view showing the first surface 31 of the body 11. FIG. 9B is a plan view showing a state in which the diaphragm 12 is placed on the body 11.

The diaphragm 12 is placed on the body 11 so as to be located inside the rib 35. The peripheral rib 44 of the diaphragm 12 is arranged on the mounting surface 311 between the peripheral rib 44 and the rib 35. Further, the diaphragm 12 is placed so that the protrusion 45 is arranged inside the protrusion 352 of the rib 35.

The protruding shape portion 352 of the rib 35 prevents the position of the diaphragm 12 from being displaced in the circumferential direction, and the central rib 43 of the diaphragm 12 can be aligned with the position along the contact portion 33a.

FIG. 10 is an enlarged cross-sectional view taken along the line N of FIG.

The rib 35 of the body 11 is arranged on the outer side in the radial direction of the end surface 42c on the outer peripheral side of the outer peripheral edge portion 42. The radial direction is perpendicular to the axis O and is a direction toward or away from the axis O.

The cross-sectional shape of the peripheral rib 44 includes a base portion 44b having a square cross section extending from the surface 42a and a tip portion 44a having a semicircle cross section connected to the base portion 44b. It is preferable that the peripheral rib 44 is formed in a substantially D shape in a cross-sectional view. The base portion 44b is formed toward the body 11 substantially perpendicular to the surface 42a. The tip portion 44a is provided on the body 11 side of the base portion 44b. The tip portion 44a is convexly curved toward the body 11.

As shown in FIG. 10, the tip surface of the peripheral rib 44 is in contact with the mounting surface 311 of the body 11. When no internal pressure is applied, such as when not in use, the diaphragm 12 is in contact with the body 11 only on the tip surface of the outer peripheral edge portion 42. The tip surface is preferably formed in an arc shape, for example, but is not limited to a strict arc shape. The tip surface is preferably formed in an arc shape, for example, but is not limited to a strict arc shape, and is preferably at least convexly curved toward the body 11. This makes it possible to reduce the occurrence of stress concentration when the diaphragm 12 swings. Further, since the tip portion 44a alone receives too much compressive force from the bonnet 13 when being sandwiched and fixed by the body 11 and the bonnet 13, the base portion 44b is provided between the tip portion 44a and the outer peripheral edge portion 42. , The rigidity of the peripheral rib 44 can be increased.

In FIG. 10, the diaphragm 12 in the state where the flow path 24 is open is shown by a solid line, and the diaphragm 12 in the state where the flow path 24 is closed is shown by a two-dot chain line. In FIG. 10, the diaphragm 12 is not hatched in order to show the diaphragm 12 in a state where the flow path 24 is closed. As shown in FIG. 10, even when the diaphragm 12 is closed, the edge rib 34 is formed at a height that does not contact the diaphragm 12. Since the space S is provided between the edge rib 34 and the diaphragm 12 in any of the open / closed states of the diaphragm 12, the peripheral rib 44 faces the flow path 24 (it can be said that it is exposed). ..

(Bonnet 13)
Like the body 11, the bonnet 13 has PVC (polyvinyl chloride), HT (heat resistant vinyl chloride tube), PP (polypropylene), or PVCF (polyfluoride bunylidene), polystyrene, ABS resin, polytetrafluoroethylene, and perfluoro. It can be formed of an alkyl vinyl ether copolymer, a resin such as polychlorotrifluoroethylene, a metal such as iron, copper, copper alloy, brass, aluminum, and stainless steel, or porcelain.

FIG. 11A is a perspective view showing the appearance of the bonnet 13. FIG. 11B is a perspective view of the bonnet 13 as viewed from below. As shown in the figure, the bonnet 13 has a main body portion 131 (an example of a lid main body), a fixed portion 132 fixed to the body 11 (an example of a holding portion), and a plurality of ribs 133.

The main body 131 has a dome shape and has an opening 13a at its widened end 131a. The opening 13a corresponds to the opening 31a of the first surface 31. Further, the main body portion 131 has a through hole 13b in the narrowed portion. The through hole 13b is formed so as to face the opening 13a, and the sleeve 62 and the stem 63, which will be described later, are arranged.

The fixing portion 132 is formed so as to extend outward from the end 131a, and as shown in FIG. 11B, a plurality of bolt holes 134, an outer bottom surface 135, an inner bottom surface 136, and a connecting surface 137. And have.

Four bolt holes 134 are formed in the fixing portion 132, face the bolt holes 37 of the body 11, the bolt 100 (see FIG. 1) is inserted, and the bonnet 13 is fixed to the body 11.

The outer bottom surface 135 is the body 11 side of the fixing portion 132, and is a portion along the outer circumference. The inner bottom surface 136 is inside the outer bottom surface 135 and is formed from the edge of the opening 13a. The outer bottom surface 135 and the inner bottom surface 136 are formed substantially perpendicular to the Z direction of the body 11. The connection surface 137 connects the inner peripheral end of the outer bottom surface 135 and the outer peripheral end of the inner bottom surface 136. The connecting surface 137 is formed along the Z direction. The inner bottom surface 136 is located on the through hole 13b side (opposite side of the body 11) of the outer bottom surface 135.

Further, the inner end of the fixing portion 132 is indicated by 132e. The end 132e can be said to be the inner end of the inner bottom surface 136. The end 132e can be said to be the edge of the opening 13a.

As shown in FIG. 10, the outer peripheral edge portion 42 of the diaphragm 12 is arranged so that the surface 42b on the opposite side of the body 11 comes into contact with the inner bottom surface 136. The rib 35 of the body 11 is arranged so as to face the inner bottom surface 136 in the Z direction. The rib 35 is located on the inner peripheral side of the connecting surface 137.

The inner bottom surface 136 of the bonnet 13 is formed in a plane, and the surface 42b of the outer peripheral edge portion 42 of the diaphragm 12 is also formed in a plane. The outer peripheral edge portion 42 of the diaphragm 12 is sandwiched and compressed by the body 11 and the bonnet 13 so that the surface 42b contacts the inner bottom surface 136 and the peripheral edge rib 44 contacts the mounting surface 311 of the body 11.

The plurality of ribs 133 are provided on the inner surface of the main body 131. The rib 133 is formed from the through hole 13b toward the opening 13a. The ribs 133 are arranged at equal intervals along the circumferential direction. Each of the plurality of ribs 133 is fitted between the protrusions 612 of the compressor 61, which will be described later. The plurality of ribs 133 function as a detent in the circumferential direction when the compressor 61 moves. Further, the plurality of ribs 133 serve as guides when the compressor 61 moves.

(Drive mechanism 14)
As shown in FIGS. 2A and 2B, the drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, a handle 64, and a diaphragm bolt 65.

(Compressor 61, diaphragm bolt 65)
The compressor 61 is formed of PVDF (polyvinylidene fluoride) or the like, and is connected to a diaphragm bolt 65 embedded in the diaphragm 12. As shown in FIG. 7B, the diaphragm bolt 65 has an end embedded in the bolt support portion 46. The diaphragm bolt 65 projects to the opposite side (non-contact surface side) of the 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 to each other.

FIG. 12A is a bottom view of the compressor 61. FIG. 12B is a cross-sectional view taken along the line between CCs of the compressor 61.

As shown in FIG. 12A, the compressor 61 has a pressing central portion 611 and a pressing peripheral portion 619 which are circular when viewed from the bottom surface. The pressing central portion 611 contacts the bolt support portion 46 of the diaphragm 12, and presses the diaphragm portion 41 of the diaphragm 12 against the contact portion 33a.

The pressing peripheral edge portion 619 is provided on the peripheral edge of the pressing central portion 611, and has an annular portion 620 and a plurality of protruding portions 612 protruding outward from the annular portion 620. The pressing peripheral edge portion 619 contacts the diaphragm portion 41 of the diaphragm 12 and presses the diaphragm portion 41 of the diaphragm 12 against the contact portion 33a.

As shown in FIG. 12B, the hole portion 617, the recess 618, and the through hole 616 are formed by the pressing central portion 611 and the annular portion 620 around the pressing center portion 611. The hole portion 617 is a columnar space, and is formed with the central axis O as an axis.

A locking pin 653 (see FIGS. 2 and 9 (b)) of the diaphragm bolt 65 is arranged in the hole 617. Further, the tip portion of the stem 63, which will be described later, is arranged in the hole portion 617.

Further, as shown in FIG. 12B, the recess 618 is formed in the center of the surface of the compressor 61 on the contact portion 33a side. The recess 618 is a space having a substantially cylindrical shape in the bottom view, and is formed with the central axis O as an axis. As shown in FIG. 8, the bolt support portion 46 of the diaphragm 12 is inserted into the recess 618.

As shown in FIG. 12B, the through hole 616 communicates the hole portion 617 with the recess 618. A diaphragm bolt 65 is inserted into the through hole 616. The through hole 616 is formed along the driving direction (central axis O direction) of the diaphragm 12.

As shown in FIG. 12A, the through hole 616 has a pair of notches having a circular hole portion 616a and a pair of notches formed outward from the edge 616ae of the circular hole portion 616a. The portion 616b is formed so as to face each other so that the locking pin 653 (see FIG. 2) of the diaphragm bolt 65 can be inserted.

In FIG. 12A, eight of the plurality of projecting portions 612 are formed, and are formed at an equal angle (about 45 degrees). The rib 133 of the bonnet 13 described above is arranged between these protrusions 612.

(Sleeve 62, stem 63, handle 64)
The sleeve 62 is supported by the through hole 13b of the bonnet 13 as shown in FIGS. 2A and 2B. A screw shape is formed inside the sleeve 62.

The stem 63 is located inside the sleeve 62 and is screwed into a threaded shape formed inside the sleeve 62. A compressor 61 is fixed to a tip portion of both ends of the stem 63, which is arranged inside the bonnet 13. The compressor 61 is engaged with the diaphragm 12 on the body 11 side and fixed to the stem 63 on the side opposite to the body 11.

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

(Arrangement of diaphragm 12 and bonnet 13)
As shown in FIG. 10, a continuous portion 48 extending from the outer peripheral edge portion 42 of the diaphragm 12 to the bent portion 47 is arranged inside (on the central axis O side) of the fixed portion 132 of the bonnet 13. The inner end of the outer peripheral edge portion 42 extends inward from the fixed portion 132.

As shown in FIGS. 8 and 10, the outer peripheral edge portion 42 is a portion that is not substantially deformed when the flow path 24 is opened and closed, and the bent portion 47 is a portion that is deformed. The continuous portion 48 is a boundary portion between the outer peripheral edge portion 42 and the bent portion 47, specifically, a portion of an inflection such as a crease, and is shown by a dotted line. As shown in FIG. 8, the bolt support portion 46 is also a portion that is not substantially deformed when the flow path 24 is closed.

The inner end 132e of the fixing portion 132 shown in FIG. 10 corresponds to the edge of the opening 13a of the bonnet 13. The main body portion 131 is formed from the inner end 132e of the fixed portion 132. In the direction perpendicular to the central axis O, the position of the continuous portion 48 is arranged closer to the central axis O than the position of the end 132e of the fixed portion 132. Further, in the present embodiment, the position of the continuous portion 48 is located inside the edge (edge rib 34) of the opening 31a of the body 11.

As shown in FIG. 8, assuming that the radius from the center (central axis O) of the opening 13a of the bonnet 13 to the end 132e is R1 and the radius from the center of the opening 13a to the continuous portion 48 is R2, R2 / R1 × 100 (%) is set to 80% or more and 95% or less.

As described above, the position of the continuous portion 48 is shifted inward from the inner end 132e of the fixed portion 132 of the bonnet 13 and further inward from the edge rib 34 of the body 11, so that the end 132e is operated during the opening / closing operation. The continuous portion 48 does not come into contact with the edge rib 34. As a result, it is possible to suppress the concentration of stress on the bent portion 47.

<Operation>
Next, the operation of the diaphragm valve 10 of the present embodiment will be described. 13 (a) and 13 (b) are diagrams schematically showing the operation of the diaphragm 12.

When the handle 64 is rotated in the direction of closing the flow path 24 from the state where the flow path 24 is open as shown in FIG. 13 (a), the stem 63 descends according to the rotation of the handle 64 (see FIG. 2). .. As the stem 63 descends, the compressor 61 fixed to the end of the stem 63 also descends.

As the compressor 61 descends, the diaphragm 12 is convexly curved toward the second surface 32 and is pressed against the contact portion 33a of the wall portion 33, as shown in FIG. 13 (b).

As a result, the flow path 24 of the diaphragm valve 10 is cut off.

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. 13 (a).

As a result, the flow path 24 of the diaphragm valve 10 is opened.

<Characteristics>
In the diaphragm valve 10 of the present embodiment, the continuous portion 48 connecting the outer peripheral edge portion 42 (an example of the peripheral edge portion) and the diaphragm portion 41 (an example of the central portion) of the diaphragm 12 is the bonnet 13 (an example of the lid portion). It is arranged inside the fixed portion 132 (an example of the holding portion). As a result, the stress concentration is dispersed from the bent portion 47 to the outer peripheral edge portion 42 during repeated opening and closing, so that it is possible to prevent the stress from being concentrated on the bent portion 47 of the diaphragm 12.

Further, in the diaphragm valve 10 of the present embodiment, the bonnet 13 (an example of the lid portion) has an opening 13a surrounded by the fixing portion 132. The continuous portion 48 is arranged at a distance of 80% to 95% of the radius R1 of the opening 13a from the center of the opening 13a.

As a result, the stress concentration is dispersed from the bent portion 47 to the outer peripheral edge portion 42, so that the stress concentration can be avoided.

Further, the diaphragm valve 10 of the present embodiment further includes a drive mechanism 14 for driving the diaphragm. The diaphragm 12 further has a bolt support portion 46 (an example of a connecting portion). The bolt support portion 46 is connected to the bent portion 47 and is arranged inside the bent portion 47, and the diaphragm bolt 65 (an example of a connecting member) of the drive mechanism 14 is fixed. As a result, the stress concentration is dispersed from the bent portion 47 to the outer peripheral edge portion 42, so that the stress concentration can be avoided.

In the diaphragm valve 10 of the present embodiment, the bending is loosened by providing the bending portion 47 between the outer peripheral edge portion 42 formed in parallel with the opening 31a and the bolt support portion 46 (an example of the connecting portion). , The water stopping power is small. As a result, the stress becomes small, and the stress concentration on the bent portion can be suppressed.

(Other embodiments)
Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment, and various changes can be made without departing from the gist of the present disclosure.

(A)
In the above embodiment, the body 11 is provided with the edge rib 34, but the edge rib 34 may not be provided.

(B)
In the above embodiment, the surface of the rib 35 on the opening 31a side is formed perpendicular to the mounting surface 311. However, as in the diaphragm valve 10'shown in FIG. 14, the edge rib 34 side of the rib 35 is formed. A step portion 36 may be formed on the surface. Water is stopped by the peripheral rib 44 coming into contact with the step portion 36.

(C)
In the above embodiment, the outer peripheral edge portion 42 of the diaphragm 12 has a circular outer periphery, but is not limited to this, and may be a square shape.

Further, in the above embodiment, the protruding portion 45 of the diaphragm 12 has a rectangular shape, but the present invention is not limited to this, and it is only necessary to regulate the positional deviation of the diaphragm 12 in the rotational direction.
Further, in the diaphragm valve 10 of the above embodiment, the protruding direction of the protruding portion 45 is orthogonal to the extending direction (longitudinal direction) of the central rib 43, but the protrusion direction is not limited to this. For example, as shown in the diaphragm 12'of FIG. 15, even if the protruding portion 45'is arranged on the extension line of the central rib 43 and the protruding direction of the protruding portion 45 is along the extending direction of the central rib 43. good. The diaphragm 12 and the diaphragm 12'may be used properly according to the diameter.

(D)
In the above embodiment, the diaphragm 12 is formed of one layer, but the diaphragm 12 is not limited to this. For example, a diaphragm in which a rubber-like elastic body and a resin are laminated may be used. In this case, it is preferable that the resin is arranged on the flow path 24 side, and as the resin, for example, PTFE (polytetrafluoroethylene), PVDF (polyvinylidene fluoride), or the like can be used.

(E)
In the diaphragm valve 10 of the above embodiment, the manual handle 64 is provided as an example of the drive mechanism, but the stem 63 may be driven by an air-driven or electrically driven drive mechanism.

Hereinafter, examples of the present disclosure will be described.

Using the diaphragm valve 10 of the present embodiment shown in FIG. 10 and the diaphragm valve 1010 of the comparative example shown in FIG. 16, a water stoppage test and a repeated opening / closing test were performed.

In the water stoppage test, an open test in a state where the flow path was open and a closed test in a state where the flow path was closed were performed under the following conditions.

Open test: Apply water pressure 2.0 (MPa) and there should be no leakage for 30 seconds.
Closing test: Apply water pressure 1.5 (MPa) and do not leak for 30 seconds.
The results of the open test are shown in (Table 1) below, and the results of the closed test are shown in (Table 2) below.

In the open test, the presence or absence of internal leakage between the diaphragm 12 and the contact portion 33a of the body 11 is verified. On the other hand, in the closing test, the presence or absence of external leakage between the outer peripheral edge portion 42 of the diaphragm 12, the body 11 and the bonnet 13 is verified.

（表１）
以上から、実施例では、比較例に対して開試験および閉試験ともに止水性が向上することがわかる
例えば、開試験の比較例では、口径４０Ａにおいて水圧を２．０ＭＰａかけた際に漏水を起こさないハンドルトルクの値が３．０Ｎ・ｍであり、口径５０Ａにおいて水圧を２．０ＭＰａかけた際に漏水を起こさないハンドルトルクの値が２．９Ｎ・ｍであった。
一方、開試験の実施例では、口径４０Ａにおいて水圧を２．０ＭＰａかけた際に漏水を起こさないハンドルトルクの値が１．９Ｎ・ｍであり、口径５０Ａにおいて水圧を２．０ＭＰａかけた際に漏水を起こさないハンドルトルクの値が２Ｎ・ｍであった。
また、閉試験の比較例では、口径４０Ａにおいて水圧を１．５ＭＰａかけた際に漏水を起こさないハンドルトルクの値が８Ｎ・ｍであり、口径５０Ａにおいて水圧を１．５ＭＰａかけた際に漏水を起こさないハンドルトルクの値が１２Ｎ・ｍであった。
一方、閉試験の実施例では、口径４０Ａにおいて水圧を１．５ＭＰａかけた際に漏水を起こさないハンドルトルクの値が４Ｎ・ｍであり、口径５０Ａにおいて水圧を１．５ＭＰａかけた際に漏水を起こさないハンドルトルクの値が８Ｎ・ｍであった。
比較例のダイヤフラムバルブでも（表１）および（表２）のトルクをかけることで止水でき使用可能であるが、比較例と比べて分かるように、開試験および閉試験ともに本実施例のダイヤフラムバルブでは、低トルクで止水することができる。

(Table 1)
From the above, it can be seen that in the examples, the water stopping property is improved in both the open test and the closed test as compared with the comparative example. The value of the handle torque that did not exist was 3.0 N ・ m, and the value of the handle torque that did not cause water leakage when a water pressure of 2.0 MPa was applied at a diameter of 50 A was 2.9 N ・ m.
On the other hand, in the example of the open test, the value of the handle torque that does not cause water leakage when a water pressure of 2.0 MPa is applied at a diameter of 40 A is 1.9 Nm, and when a water pressure of 2.0 MPa is applied at a diameter of 50 A. The value of the handle torque that did not cause water leakage was 2 Nm.
Further, in the comparative example of the closed test, the value of the handle torque that does not cause water leakage when a water pressure of 1.5 MPa is applied at a diameter of 40 A is 8 Nm, and water leakage occurs when a water pressure of 1.5 MPa is applied at a diameter of 50 A. The value of the steering wheel torque that did not occur was 12 Nm.
On the other hand, in the example of the closing test, the value of the handle torque that does not cause water leakage when a water pressure of 1.5 MPa is applied at a diameter of 40 A is 4 Nm, and water leakage occurs when a water pressure of 1.5 MPa is applied at a diameter of 50 A. The value of the steering wheel torque that did not occur was 8 Nm.
The diaphragm valve of the comparative example can also be used because it can stop water by applying the torques (Table 1) and (Table 2), but as can be seen from the comparison with the comparative example, the diaphragm of this example is used for both the open test and the closed test. The valve can stop water with low torque.

The results of the repeated durability test are shown in (Table 3) below.

In the repeated durability test, the diaphragm 12 was driven by an air drive type instead of manually. The caliber was, for example, 15A.

（表３）に示すように、比較例の構成のダイヤフラムバルブでは、空気駆動の際の操作エア圧を０．１ＭＰａとした場合、１０万回に達する前に屈曲部から破損した。

As shown in (Table 3), in the diaphragm valve having the configuration of the comparative example, when the operating air pressure at the time of air drive was 0.1 MPa, the diaphragm valve was damaged from the bent portion before reaching 100,000 times.

On the other hand, in the diaphragm valve of the example, when the operating air pressure at the time of air driving was 0.15 MPa, no damage occurred even when the operation air pressure reached 2.7 million times.

From the above, by arranging the position of the continuous portion 48 connected from the outer peripheral edge portion 42 to the bent portion 47 inside the inner end 132e of the fixed portion 132 of the bonnet 13, stress concentration on the bent portion can be avoided. The strength against repeated opening and closing can be improved.

10: Diaphragm valve 11: Body 12: Septum 13: Bonnet 24: Flow path 42: Outer peripheral edge 47: Bent part 48: Continuous part 132: Fixed part

Claims (5)

A valve body having an abutting portion provided in a flow path formed inside and an opening formed so as to face the abutting portion.
A diaphragm that is arranged in the valve body so as to close the opening and closes the flow path by contacting the contact portion.
It has a holding portion that sandwiches the peripheral edge portion of the diaphragm with the valve body, and includes a lid portion arranged so as to cover the diaphragm.
The diaphragm has a peripheral portion and a bent portion that is connected to the peripheral portion and is arranged inside the peripheral portion and bends when the flow path is opened or closed.
The continuous portion of the peripheral edge portion and the bent portion is arranged inside the holding portion of the lid portion.
Diaphragm valve. The lid portion has an opening surrounded by the pinching portion.
The continuous portion is arranged at a distance of 80% to 95% of the radius of the opening from the center of the opening.
The diaphragm valve according to claim 1. Further provided with a drive mechanism for driving the diaphragm,
The diaphragm is
Further having a connecting portion connected to the bent portion and arranged inside the bent portion and to which a connecting member of the drive mechanism is fixed.
The diaphragm valve according to claim 1 or 2. The peripheral edge portion and the connecting portion are formed in parallel with the opening portion.
The diaphragm valve according to claim 3. The drive mechanism is
A compressor placed inside the lid and pressing the diaphragm,
The stem fixed to the compressor and
With a sleeve fixed to the lid and screwed to the stem,
The lid is
It forms a space for the compressor to move and further has a lid body disposed from the inner end of the pinch towards the opposite side of the valve body.
The diaphragm valve according to claim 3 or 4.

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