阅读说明：本技术 隔膜阀 (Diaphragm valve ) 是由 土田理彩子 斋藤绚香 于 2019-02-01 设计创作，主要内容包括：在隔膜阀(10)中,阀主体(11)具有入口侧流路(241)、出口侧流路(242)、连通部(243)、第1面(31)、第2面(32)、入口侧肋部(51)及出口侧肋部(52)。连通部(243)将入口侧流路(241)与出口侧流路(242)连通。在第1面(31),形成有与连通部(243)对向的开口(31a)。第2面(32)隔着入口侧流路(241)及出口侧流路(242)而与第1面(31)对向。入口侧肋部(51)设置于第2面(32),且沿着入口侧流路(241)形成。出口侧肋部(52)设置于第2面(32),且沿着出口侧流路(242)形成。在入口侧肋部(51),形成有凹部(51a)。在出口侧肋部(52),形成有凹部(52a)。(In a diaphragm valve (10), a valve body (11) has an inlet-side flow path (241), an outlet-side flow path (242), a communication section (243), a 1 st surface (31), a 2 nd surface (32), an inlet-side rib (51), and an outlet-side rib (52). The communication section (243) communicates the inlet-side flow path (241) with the outlet-side flow path (242). An opening (31a) facing the communication section (243) is formed in the 1 st surface (31). The 2 nd surface (32) is opposed to the 1 st surface (31) with the inlet-side flow path (241) and the outlet-side flow path (242) therebetween. The inlet-side rib (51) is provided on the 2 nd surface (32) and is formed along the inlet-side flow path (241). The outlet-side rib (52) is provided on the 2 nd surface (32) and is formed along the outlet-side flow path (242). A recess (51a) is formed in the entrance-side rib (51). A recess (52a) is formed in the outlet-side rib (52).)

1. A diaphragm valve is provided with:

a valve body having an inlet-side flow path, an outlet-side flow path, a communication portion that communicates the inlet-side flow path with the outlet-side flow path, a 1 st surface on which an opening facing the communication portion is formed, a 2 nd surface facing the 1 st surface with the inlet-side flow path and the outlet-side flow path interposed therebetween, an inlet-side rib provided on the 2 nd surface and formed along the inlet-side flow path, and an outlet-side rib provided on the 2 nd surface and formed along the outlet-side flow path;

a diaphragm disposed on the 1 st surface so as to cover the opening;

a bonnet fixed to the valve body so as to cover the diaphragm; and

a driving mechanism that drives the diaphragm to block or open the communicating portion, wherein,

a recess is formed at least one of the entrance-side rib and the exit-side rib.

2. The diaphragm valve of claim 1, wherein,

the rib has a 1 st inclined end and a 2 nd inclined end in the recess,

the 1 st inclined end portion is inclined so as to approach the 1 st surface toward the 2 nd inclined end portion side, the 2 nd inclined end portion is inclined so as to approach the 1 st surface toward the 1 st inclined end portion side, and an angle formed by the 1 st inclined end portion and the 2 nd inclined end portion is 110 degrees or more and 170 degrees or less.

3. The diaphragm valve of claim 1 or 2, wherein,

the recess is provided at both the inlet-side rib and the outlet-side rib.

4. The diaphragm valve of claim 2, wherein,

the 1 st inclined end portion and the 2 nd inclined end portion are continuously connected by a curved end portion.

5. The diaphragm valve of any of claims 1 to 4, wherein,

the drive mechanism includes:

a stem supported at the bonnet;

a compressor mounted to the rod and connected to the diaphragm; and

a driving part which drives the rod,

the driving section is of a manual type, an air-driven type, or an electric-driven type.

Background

A diaphragm valve is provided in a piping line in equipment for water treatment, chemical, food, and the like, and fluid flowing through the piping is controlled by the diaphragm valve (see, for example, patent document 1).

Such a diaphragm valve has pipes connected to both ends thereof, and the pipes are provided in the apparatus. The diaphragm valve is in a state in which the flow path is closed by pressing the diaphragm against the partition wall, and is in a state in which the flow path is opened by separating the diaphragm from the partition wall.

Disclosure of Invention

Technical problem to be solved by the invention

However, since pipes are connected to both ends of the diaphragm valve, external force such as tensile force of the pipes may be applied to the diaphragm valve, thereby degrading long-term durability.

The invention aims to provide a diaphragm valve with improved long-term durability.

Means for solving the problems

To achieve the above object, a diaphragm valve according to claim 1 includes a valve main body, a diaphragm, a bonnet, and a drive mechanism. The valve body has an inlet-side flow passage, an outlet-side flow passage, a communication portion, the 1 st surface, the 2 nd surface, an inlet-side rib, and an outlet-side rib. The communication section communicates the inlet-side flow path with the outlet-side flow path. The 1 st surface is formed with an opening opposed to the communication portion. The 2 nd surface is opposed to the 1 st surface through the inlet-side channel and the outlet-side channel. The inlet-side rib is provided on the 2 nd surface and is formed along the inlet-side flow path. The outlet-side rib is provided on the 2 nd surface and is formed along the outlet-side flow path. The diaphragm is disposed on the 1 st surface so as to cover the opening. A bonnet is secured to the valve body in a manner to cover the diaphragm. The drive mechanism drives the diaphragm in such a manner as to close or open the communication portion. A recess is formed at least one of the inlet-side rib and the outlet-side rib.

By forming the recessed portion in the rib portion formed along the flow path in this manner, even when an external force is applied to the diaphragm valve, stress generated in the valve main body can be dispersed.

That is, the rib is provided to enhance the valve body, but stress may be concentrated in the vicinity of the rib, and thus the stress can be dispersed by forming the recess as described above.

The diaphragm valve according to claim 2 is the diaphragm valve according to claim 1, wherein the recess has a 1 st inclined end and a 2 nd inclined end. The 1 st inclined end portion is inclined toward the 2 nd inclined end portion side so as to approach the 1 st surface, the 2 nd inclined end portion is inclined toward the 1 st inclined end portion side so as to approach the 1 st surface, and an angle formed by the 1 st inclined end portion and the 2 nd inclined end portion is 110 degrees or more and 170 degrees or less.

By setting the angle formed by the 1 st inclined end portion and the 2 nd inclined end portion to 110 degrees or more and 170 degrees or less in this manner, even when an external force is applied to the diaphragm valve, it is possible to disperse the stress generated in the valve main body.

The effect of reinforcing the valve body is exerted by providing the rib, but stress may be concentrated in the vicinity of the rib, and thus stress can be dispersed by forming the 1 st inclined end portion and the 2 nd inclined end portion as described above.

Therefore, the long-term durability of the diaphragm valve can be improved.

The diaphragm valve according to claim 3 is the diaphragm valve according to claim 1 or 2, wherein the recess is provided in both the inlet-side rib and the outlet-side rib.

This makes it possible to disperse the stress over the entire flow path of the diaphragm valve along the valve body.

The diaphragm valve of the 4 th invention is the diaphragm valve as in the 1 st or 2 nd invention, wherein the 1 st inclined end portion and the 2 nd inclined end portion are continuously connected by a bent end portion.

This can further exhibit the effect of dispersing the stress.

The diaphragm valve according to claim 5 is the diaphragm valve according to any one of claims 1 to 4, wherein the driving mechanism includes a rod, a compressor, and a driving unit. The stem is supported at the bonnet. The compressor is mounted to the rod and is connected to the diaphragm. The driving part drives the rod. The driving section is of a manual type, an air-driven type, or an electric-driven type.

In this manner, the lever can be actuated manually, pneumatically, or electrically to close or open the flow path.

Effects of the invention

According to the present invention, a diaphragm valve having improved long-term durability can be provided.

Drawings

Fig. 1 is a perspective view of a diaphragm valve according to an embodiment of the present invention.

Figure 2 is a partial cross-sectional view of the diaphragm valve of figure 1.

Fig. 3 is a perspective view of the valve body of fig. 1 as viewed from above.

Fig. 4 is a perspective view of the valve body of fig. 1 as viewed from below.

Fig. 5 is a front view of the valve body of fig. 1.

Fig. 6 is a bottom view of the valve body of fig. 1.

FIG. 7 is an arrow cross-sectional view between AA' of FIG. 6.

Fig. 8(a) is an enlarged view of the S portion of fig. 7, and (b) is an enlarged view of the T portion of fig. 7.

Fig. 9(a) is a schematic cross-sectional view showing a state in which the flow channel is closed, and (b) is a schematic cross-sectional view showing a state in which the flow channel is opened.

FIG. 10 is a sectional view showing the stress generated in examples (a) to (c).

Fig. 11 is a diagram showing a table of determination results of the embodiment.

Detailed Description

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

<1. constitution >

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 sectional configuration diagram of the diaphragm valve 10 of the present embodiment.

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

(valve body 11)

Fig. 3 is a perspective view of the valve body 11 as viewed from the 1 st surface 31 side described below. Fig. 4 is a perspective view of the valve body 11 viewed from the 2 nd surface 32 side described below. Fig. 5 is a front view of the valve main body 11, and fig. 6 is a bottom view of the valve main body 11. Fig. 7 is an arrow sectional view between AA' of fig. 6.

The valve main body 11 may be made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), PVDF (polyvinylidene fluoride), polystyrene, ABS (Acrylonitrile-butadiene-styrene) resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, or other resins, or iron, copper alloy, brass, aluminum, stainless steel, or other metals, or ceramics.

As shown in fig. 3, the valve body 11 has a 1 st end portion 21, a 2 nd end portion 22, a central portion 23, and a flow path 24.

The 1 st end portion 2 and the 2 nd end portion 22 are formed integrally with the central portion 23, and as shown in fig. 7, the flow path 24 is formed over the 1 st end portion 21, the central portion 23, and the 2 nd end portion 22.

(1 st end 21, 2 nd end 22)

As shown in fig. 3 and 4, the 1 st end portion 21 and the 2 nd end portion 22 are disposed so as to sandwich the central portion 23, and are connected to the central portion 23.

As shown in fig. 3, the 1 st end portion 21 has: a 1 st flange 211 to which a pipe is connected; and a 1 st connecting portion 212 connecting the 1 st flange portion 211 with the central portion 23. As shown in fig. 4, the 1 st flange portion 211 has a 1 st flange surface 213 to which a pipe can be connected, and the 1 st flange surface 213 is formed with an inlet 24a through which a fluid flows into the valve main body 11.

Further, as shown in fig. 4, the 2 nd end portion 22 has: a 2 nd flange 221 to which a pipe is connected; and a 2 nd connecting portion 222 connecting the 2 nd flange portion 221 and the central portion 23. As shown in fig. 3, the 2 nd flange part 221 has a 2 nd flange surface 223 to which a pipe can be connected, and the 2 nd flange surface 223 is formed with an outlet 24b through which the fluid is discharged from the valve main body 11.

As shown in fig. 3 and 4, the 1 st flange portion 211 and the 2 nd flange portion 221 are disposed to face each other, and as shown in fig. 7, the 1 st flange surface 213 and the 2 nd flange surface 223 are formed to face each other and to be parallel to each other. The inlet 24a is also located opposite the outlet 24 b.

(center 23, channel 24)

As shown in fig. 5, the central portion 23 is disposed between the 1 st end portion 21 and the 2 nd end portion 22. The central portion 23 includes a 1 st surface 31, a 2 nd surface 32, a wall portion 33 (see fig. 7), and a rib 34.

As shown in fig. 3, the 1 st surface 31 is substantially planar and is formed perpendicular to the 1 st flange surface 213 and the 2 nd flange surface 223. An opening 31a is formed in the center of the 1 st surface 31. The opening 31a is formed with its periphery curved. A direction along a line connecting the inlet 24a to the outlet 24b is referred to as a 1 st direction X, and a direction perpendicular to the 1 st direction X and parallel to the 1 st surface 31 is referred to as a 2 nd direction Y. The 1 st direction X may also be referred to as a direction along a straight line perpendicular to the 1 st flange surface 213 and the 2 nd flange surface 223.

As shown in fig. 5, the 2 nd surface 32 is a surface facing the 1 st surface 31 via the flow path 24. The 2 nd surface 32 is formed along the shape of the flow path 24. The 2 nd surface 32 is a surface opposite to the side of the central portion 23 on which the bonnet 13 is disposed.

As shown in fig. 7, the flow path 24 is formed from the inlet 24a to the outlet 24b, and the wall 33 is formed in the center of the flow path 24 so as to protrude toward the 1 st surface 31. The wall portion 33 is formed by gradually rising the inner surface of the flow path 24 toward the 1 st surface 31 so as to be inclined with respect to the flow path 24. The opening 31a is formed at a position corresponding to the wall portion 33. The diaphragm 12 described below is pressed against the 1 st surface 31 side end portion 33a of the wall portion 33.

The flow path 24 has: an inlet-side flow path 241 formed from the inlet 24a of the first end portion 21 to the wall portion 33; an outlet-side flow passage 242 formed from the outlet 24b of the 2 nd end 22 to the wall 33; and a communicating portion 243 for communicating the inlet-side flow path 241 with the outlet-side flow path 242.

As shown in fig. 7, the width of the inlet-side flow channel 241 in the direction perpendicular to the 1 st surface 31 becomes narrower toward the wall portion 33. On the other hand, the width of the inlet-side channel 241 in the direction parallel to the 1 st surface 31 (the direction perpendicular to the paper surface in fig. 7) increases toward the wall 33.

The outlet side channel 242 is formed from the outlet 24b of the 2 nd flange 221 to the wall portion 33. As shown in fig. 7, the width of the outlet-side channel 242 in the direction perpendicular to the 1 st surface 31 becomes narrower toward the wall portion 33. On the other hand, the width of the outlet-side channel 242 in the direction parallel to the 1 st surface 31 (the direction perpendicular to the paper surface in fig. 7) increases toward the wall 33.

The communicating portion 243 is a portion of the wall portion 33 of the flow path 24 on the 1 st surface 31 side, and communicates the inlet-side flow path 241 with the outlet-side flow path 242.

As shown in fig. 4, the 2 nd surface 32 has: an inlet-side bent portion 321 along the inlet-side flow path 241; and an outlet-side bent portion 322 along the outlet-side flow path 242. The inlet-side bent portion 321 and the outlet-side bent portion 322 form a projection of the wall portion 33 toward the 1 st surface 31 shown in fig. 7.

(Rib 34)

As shown in fig. 4 and 6, the rib 34 is formed to protrude from the 2 nd surface 32 perpendicularly to the 1 st surface 31. The rib 34 includes a 1 st rib 41 and a 2 nd rib 42.

As shown in fig. 4 and 6, the 1 st rib 41 is formed from the entrance-side bent portion 321 to the exit-side bent portion 322 of the 2 nd surface 32 in the 1 st direction X. Further, the 1 st rib 41 is provided at the center of the center portion 23 in the 2 nd direction Y.

The 2 nd rib 42 is formed along the 2 nd direction Y and is provided at the center of the 1 st direction X of the center portion 23.

Further, outer edge portions 35 are formed toward the 2 nd surface 32 from each of both ends of the 1 st surface 31 in the 2 nd direction Y, and the 2 nd rib portions 42 are formed from one outer edge portion 35 to the other outer edge portion 35.

As shown in fig. 6, the 1 st and 2 nd ribs 41 and 42 intersect each other at a center portion 43, which is the center thereof, in a cross shape in a plan view. As shown in fig. 4, a bolt hole 43a is formed in the center portion 43 so as to face the 1 st surface 31.

The 1 st rib 41 includes: an inlet-side rib 51 provided on the inlet 24a side with respect to the center portion 43; and an outlet-side rib 52 provided on the outlet 24b side with respect to the center portion 43.

The inlet-side rib 51 is provided along the inlet-side flow path 241. The entrance-side rib 51 can be said to be formed along a direction perpendicular to the 1 st flange surface 213 and the 2 nd flange surface 223.

As shown in fig. 4 and 7, a recess 51a is formed in the entrance-side rib 51. Stress due to external force is relaxed by the concave portion 51 a. Fig. 8(a) is an enlarged view of the S portion of fig. 7. As shown in fig. 8(a), the entrance-side rib 51 has a 1 st inclined end 511, a 2 nd inclined end 512, and a curved end 513 connecting the 1 st inclined end 511 and the 2 nd inclined end 512 in the recess 51 a. The 1 st inclined end portion 511 and the 2 nd inclined end portion 512 are formed linearly when viewed along the 2 nd direction Y.

From the central portion 43 toward the 1 st end portion 21, the 1 st inclined end portion 511, the bent end portion 513, and the 2 nd inclined end portion 512 are arranged in this order.

The 1 st inclined end portion 511 is inclined from the central portion 43 toward the 1 st end portion 21 side so as to approach the 1 st surface 31. The 2 nd inclined end 512 is inclined from the center portion 43 side toward the 1 st end 21 side so as to be apart from the 1 st surface 31.

Further, it can be said that the 1 st inclined end portion 511 is inclined so as to approach the 1 st surface 31 toward the 2 nd inclined end portion 512 side, and the 2 nd inclined end portion 512 is inclined so as to approach the 1 st surface 31 toward the 1 st inclined end portion 511 side.

The bent end portion 513 continuously connects the 1 st inclined end portion 511 and the 2 nd inclined end portion 512 without a step.

As shown in fig. 8(a), an angle θ 1 formed by a straight line L1 along the 1 st inclined end 511 and a straight line M1 along the 2 nd inclined end 512 in front view is set to 110 degrees or more and 170 degrees or less.

The outlet-side rib 52 is provided on the 2 nd surface 32 on the 2 nd end 22 side of the central portion 43 along the outlet-side flow path 242. The outlet-side rib 52 can be said to be formed along a direction perpendicular to the 1 st flange surface 213 and the 2 nd flange surface 223.

As shown in fig. 4 and 7, a recess 52a is formed in the outlet-side rib 52. Stress due to external force is relaxed by the concave portion 52 a. Fig. 8(b) is an enlarged view of the T portion of fig. 7. The outlet-side rib 52 has a 1 st inclined end 521, a 2 nd inclined end 522, and a bent end 523 connecting between the 1 st inclined end 521 and the 2 nd inclined end 522 in the recess 52 a. The 1 st inclined end 521 and the 2 nd inclined end 522 are formed in a straight line shape when viewed in the 2 nd direction Y (front view).

The 1 st inclined end 521, the bent end 523, and the 2 nd inclined end 522 are arranged in this order from the central portion 43 toward the 2 nd end 22.

The 1 st inclined end 521 is inclined from the central portion 43 toward the 2 nd end 22 so as to approach the 1 st surface 31. The 2 nd inclined end 522 is inclined from the center 43 toward the 2 nd end 22 away from the 1 st surface 31.

Further, it can be said that the 1 st inclined end 521 is inclined so as to approach the 1 st surface 31 toward the 2 nd inclined end 522 side, and the 2 nd inclined end 522 is inclined so as to approach the 1 st surface 31 toward the 1 st inclined end 521 side.

The bent end portion 513 continuously connects the 1 st inclined end portion 511 and the 2 nd inclined end portion 512 without a step.

As shown in fig. 8(b), an angle θ 2 formed by a straight line L2 along the 1 st inclined end 521 and a straight line M2 along the 2 nd inclined end 522 in a front view is set to 110 degrees or more and 170 degrees or less

(diaphragm 12)

The material of the diaphragm 12 is not particularly limited as long as it is a rubber-like elastic body. Examples of the preferable material include ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene butadiene rubber, chlorinated polyethylene, fluororubber, EPDM (ethylene/propylene/diene rubber), PTFE (polytetrafluoroethylene), and the like. In addition, a reinforcing cloth having a high strength may be embedded in the diaphragm 12, and the reinforcing cloth is preferably made of nylon. This reinforcement is preferable because it prevents deformation or breakage of the diaphragm 12 when the diaphragm 12 is subjected to fluid pressure when the diaphragm valve is closed.

As shown in fig. 2, the diaphragm 12 is disposed on the 1 st surface 31 so as to cover the opening 31 a. The outer peripheral edge 121 of the diaphragm 12 is sandwiched between the valve body 11 and a bonnet 13 described below.

The diaphragm 12 is moved downward by a drive mechanism 14 described below and comes into contact with the front end 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 driving mechanism 14 and separated from the distal end portion 33a, thereby opening the flow path 24.

(valve cap 13)

The bonnet 13 may be made of a resin such as PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), PVDF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, or a metal such as iron, copper alloy, brass, aluminum, stainless steel, or a ceramic, as in the case of the valve body 11.

As shown in fig. 1 and 2, the bonnet 13 is fixed to the 1 st surface 31 of the valve main body 11 by bolts 100 or the like. The bonnet 13 is provided to cover the opening 31a with the diaphragm 12. That is, the bonnet 13 has an opening 13a corresponding to the 1 st surface 31, and a through hole 13b in which a sleeve 62 and a rod 63 described below are arranged at a position facing the opening 13 a.

(drive mechanism 14)

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

The compressor 61 is formed of PVDF (polyvinylidene fluoride) or the like, and is connected to the diaphragm 12. An engaging member 65 is embedded in the diaphragm 12, and the engaging member 65 protrudes toward the opposite side (non-liquid-contact surface side) of the valve main body 11. The protruding portion of the engaging member 65 engages with the compressor 61, and connects the compressor 61 and the diaphragm 12.

The sleeve 62 is supported by the through hole 13b of the bonnet 13. Inside the sleeve 62, a screw shape is formed.

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

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

<2. operation >

Next, the operation of the diaphragm valve 10 of the present embodiment will be described. Fig. 9(a) and 9(b) are views schematically showing the operation of the diaphragm 12.

When the knob 64 is rotated in a direction to close the flow path 24 from the state in which the flow path 24 is opened shown in fig. 9(a), the lever 63 descends as the knob 64 is rotated (see fig. 2). The compressor 61 fixed at the end of the rod 63 also descends along with the descent of the rod 63.

As shown in fig. 9(b), the diaphragm 12 is convexly curved toward the 2 nd surface 32 by lowering the compressor 61, and is pressed against the distal end 33a of the wall 33.

This closes the flow channel 24 of the diaphragm valve 10.

On the other hand, when the handle 64 is rotated in the opening direction, the lever 63 rises as the handle 64 rotates. The compressor 61 is also raised together with the raising of the rod 63, and the center portion of the diaphragm 12 engaged with the compressor 61 is raised as shown in fig. 9 (a).

This opens the flow channel 24 of the diaphragm valve 10.

<3. example >

When θ 1 and θ 2 are changed to 100 °, 110 °, 140 °, 170 °, and 180 °, the stress generated in the valve body 11 is analyzed, and the determination is made in 3 states. As the 1 st state, the stress generated in the valve main body 11 when the diaphragm 12 is pressed against the wall portion 33 is determined. In the 2 nd state, stress generated in the valve body 11 due to the self weight of the diaphragm valve 10 is determined. As the 3 rd state, the stress generated in the valve main body 11 when the 1 st flange portion 211 and the 2 nd flange portion 221 are stretched by the pipe is determined.

Fig. 10(a) is a diagram showing stress applied to the valve main body 11 in the 1 st state. The force with which the diaphragm 12 is pressed against the wall portion 33 is denoted by F1. By F1, stress F2 directed inward in the 1 st direction X is generated on the 1 st surface 31 side of the valve body 11, and stress F3 directed outward is generated on the inlet-side rib 51 and the outlet-side rib 52.

Fig. 10(b) is a diagram showing the stress applied to the valve main body 11 in the 2 nd state. F1 represents a force applied to the valve main body 11 when the valve main body 11 is fixed at a specific position by inserting a bolt into the bolt hole 43a of the center portion 43. By F1, stress F2 directed outward in the 1 st direction X is generated on the 1 st surface 31 side of the valve body 11, and stress F3 directed inward is generated on the inlet-side rib 51 and the outlet-side rib 52.

Fig. 10(c) is a diagram showing the stress applied to the valve main body 11 in the 3 rd state. The force with which the 1 st flange portion 211 and the 2 nd flange portion 221 are drawn by the pipe is denoted by F1. By F1, stress F2 directed outward in the 1 st direction X is generated on the 1 st surface 31 side of the valve body 11, and stress F3 directed inward is generated on the inlet-side rib 51 and the outlet-side rib 52.

The sizes of F2 and F3 were obtained by analysis, and whether the evaluation was satisfactory or not was determined. Since the magnitude of F2 is proportional to the magnitude of F3, only F2 is used as the determination criterion. Fig. 11 is a diagram showing the judgment result of the embodiment. In the 1 st state, a case where the stress is 400MPa or less is judged to be good, in the 2 nd state, a case where the stress is 2MPa or less is judged to be good, and in the 3 rd state, a case where the stress is 50MPa or less is judged to be good.

As shown in the figure, when θ 1 and θ 2 are 110 ° or more and 170 °, it is determined that a good result is obtained in any of the 3 states.

<4. characteristics, etc. >

(4-1)

The diaphragm valve 10 of the present embodiment includes a valve main body 11, a diaphragm 12, a bonnet 13, and a drive mechanism 14. The valve main body 11 includes an inlet-side flow passage 241, an outlet-side flow passage 242, a communication portion 243, a 1 st surface 31, a 2 nd surface 32, an inlet-side rib 51, and an outlet-side rib 52. The communicating portion 243 communicates the inlet-side flow path 241 with the outlet-side flow path 242. An opening 31a facing the communication portion 243 is formed in the 1 st surface 31. The 2 nd surface 32 faces the 1 st surface 31 via the inlet-side flow path 241 and the outlet-side flow path 242. The inlet-side rib 51 is provided on the 2 nd surface 32 and is formed along the inlet-side flow path 241. The outlet-side rib 52 is provided on the 2 nd surface 32 and is formed along the outlet-side flow path 242. The diaphragm 12 is disposed on the 1 st surface 31 so as to cover the opening 31 a. The bonnet 13 is fixed to the valve main body 11 so as to cover the diaphragm 12. The driving mechanism 14 drives the diaphragm 12 so as to close or open the communication portion 243. The entrance-side rib 51 has a recess 51 a. The outlet-side rib 52 has a recess 52 a.

By forming the recesses 51a, 52a in the 1 st rib 41 formed along the flow channel 24 in this manner, even when an external force is applied to the diaphragm valve 10, the stress generated in the valve main body 11 can be dispersed.

That is, the rib is provided to enhance the valve body, but stress may be concentrated in the vicinity of the rib, and thus the stress can be dispersed by forming the concave portions 51a and 52a as described above.

Therefore, the long-term durability of the diaphragm valve 10 can be improved.

(4-2)

In the diaphragm valve 10 of the present embodiment, the 1 st inclined end portion 511 and the 2 nd inclined end portion 512 are formed in the recess 51 a. The 1 st inclined end 511 is inclined so as to approach the 1 st surface 31 toward the 2 nd inclined end 512, the 2 nd inclined end 512 is inclined so as to approach the 1 st surface 31 toward the 1 st inclined end 511, and an angle θ 1 formed by the 1 st inclined end 511 and the 2 nd inclined end 512 is 110 degrees or more and 170 degrees or less. In the recess 52a, a 1 st inclined end 521 and a 2 nd inclined end 522 are formed. The 1 st inclined end 521 is inclined so as to approach the 1 st surface 31 toward the 2 nd inclined end 522, the 2 nd inclined end 522 is inclined so as to approach the 1 st surface 31 toward the 1 st inclined end 521, and an angle θ 2 formed by the 1 st inclined end 521 and the 2 nd inclined end 522 is 110 degrees or more and 170 degrees or less.

By setting the angles θ 1 and θ 2 formed by the 1 st inclined end portions 511 and 521 and the 2 nd inclined end portions 512 and 522 to 110 degrees or more and 170 degrees or less in this manner, even when an external force is applied to the diaphragm valve 10, stress generated in the valve main body 11 can be dispersed.

That is, the effect of reinforcing the valve body is exerted by providing the rib, but stress may be concentrated in the vicinity of the rib, and thus the stress can be dispersed by forming the 1 st inclined end portions 511 and 521 and the 2 nd inclined end portions 512 and 522 as described above.

Therefore, the long-term durability of the diaphragm valve 10 can be improved.

(4-3)

In the diaphragm valve 10 of the present embodiment, the inlet-side rib 51 is provided with the recess 51a, and the outlet-side rib 52 is provided with the recess 52 a.

This makes it possible to disperse stress over the entire flow path 24 of the diaphragm valve 10 along the valve main body 11.

(4-4)

In the diaphragm valve 10 of the present embodiment, the 1 st inclined end portion 511 and the 2 nd inclined end portion 512 are continuously connected by the bent end portion 513. The 1 st inclined end 521 and the 2 nd inclined end 522 are continuously connected by a curved end 523 (an example of a curved end).

This can further exhibit the effect of dispersing the stress.

(4-5)

In the diaphragm valve 10 of the present embodiment, the driving mechanism 14 includes a rod 63, a compressor 61, and a handle 64 (an example of a driving unit). The stem 63 is supported at the bonnet 13. The compressor 61 is mounted to the rod 63 and is connected to the diaphragm 12. Handle 64 drives rod 63. The handle 64 is manual.

In this manner, the lever 63 can be manually driven to block or open the flow path 24.

Other embodiments

While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

(A)

In the above embodiment, the concave portion is formed in both the inlet-side rib 51 and the outlet-side rib 52, but the concave portion may be formed in only one of them. Even in this case, the stress can be relaxed by the concave portion on the side where at least the concave portion is provided.

(B)

In the diaphragm valve 10 of the above embodiment, the manual handle 64 is provided as an example of the driving section, but the driving section driving lever 63 of an air driving type or an electric driving type may be used.

(C)

In the diaphragm valve 10 of the above embodiment, the wall portion 33 is provided, but the wall portion 33 may not be provided, and in short, the flow path 24 may be closed or opened by the diaphragm 12.

(D)

In the diaphragm valve 10 of the embodiment, the bent end portion 513 is formed between the 1 st inclined end portion 511 and the 2 nd inclined end portion 512, and the bent end portion 523 is formed between the 1 st inclined end portion 521 and the 2 nd inclined end portion 522, but both or one of the bent end portions 513 and 523 may not be formed and the inclined end portions may be directly connected to each other.

Further, the 1 st inclined end portion 511 and the 2 nd inclined end portion 512 and/or the 1 st inclined end portion 521 and the 2 nd inclined end portion 522 may be connected by end portions formed linearly, not by curved end portions.

Industrial applicability

The diaphragm valve of the present invention exhibits an effect of improving long-term durability, and is useful when using equipment or the like.

Description of the symbols

10 diaphragm valve

11 valve body

12 diaphragm

13 valve cap

14 drive mechanism

24 flow path

31 item 1

31a opening

32 nd 2 nd side

51 entrance side rib

51a concave part

52 outlet side rib

52a recess

241 inlet side flow path

242 outlet side flow passage

243 communication part

511 No. 1 oblique end

512 nd 2 nd inclined end part

521 st inclined end part

522 nd 2 nd inclined end part