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,在流路(24)的宽度方向Y的中央处的截面图中,入口侧流路(241)由设置于开口(31a)侧的第1流路形成面(35)及设置于开口(31a)的相反侧的第2流路形成面(36)形成。第2流路形成面(36)的截面图中的线的拐点即入口侧拐点(36a)配置为较开口(31a)的入口(24a)侧的内周面(31c)与第1流路形成面(35)在截面图中的交点即入口侧接触点(31d)更靠出口(24b)侧。入口侧接触点(31d)配置为较入口侧拐点(36a)更靠开口(31a)侧。形成入口侧接触点(31d)的第1流路形成面(35)与开口(31a)的入口(24a)侧的内周面(31c)在截面图中的角度θ1满足0°<θ1≤90°。(In the diaphragm valve (10), in a cross-sectional view at the center of the flow path (24) in the width direction Y, an inlet-side flow path (241) is formed by a 1 st flow path forming surface (35) provided on the opening (31a) side and a 2 nd flow path forming surface (36) provided on the opposite side of the opening (31 a). An inlet-side inflection point (36a), which is an inflection point of a line in a cross-sectional view of the 2 nd flow channel forming surface (36), is disposed closer to the outlet (24b) than an inlet-side contact point (31d), which is an intersection point of the inner peripheral surface (31c) on the inlet (24a) side of the opening (31a) and the 1 st flow channel forming surface (35) in the cross-sectional view. The entrance-side contact point (31d) is disposed closer to the opening (31a) than the entrance-side inflection point (36 a). An angle theta 1 between a 1 st flow path forming surface (35) forming the inlet-side contact point (31d) and an inner peripheral surface (31c) on the inlet (24a) side of the opening (31a) in a cross-sectional view satisfies 0 DEG < theta 1 ≦ 90 deg.)

1. A diaphragm valve, having:

a valve main body having a flow path formed inside by connecting an inlet and an outlet provided in opposite directions, 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 disposed so as to cover the opening portion and that can block the flow path by coming into contact with the contact portion;

a cover portion fixed to the valve main body so as to cover the valve portion; and

a drive mechanism that opens and closes the flow path by driving the valve portion, wherein,

the flow path has an inlet side flow path formed from the inlet to the contact portion and an outlet side flow path formed from the contact portion to the outlet,

the inlet-side flow path is formed by a 1 st flow path forming surface provided on the side of the opening and a 2 nd flow path forming surface provided on the opposite side of the opening in a cross-sectional view at the center in the width direction of the flow path,

an entrance-side inflection point which is an inflection point of a line of the 2 nd flow channel forming surface in the cross-sectional view is disposed closer to the entrance side or the exit side than an entrance-side intersection point which is an intersection point of the inner peripheral surface on the entrance side of the opening portion and the 1 st flow channel forming surface in the cross-sectional view,

the entrance-side intersection point is disposed closer to the opening portion side than the entrance-side inflection point,

an angle θ 1 between the 1 st flow passage forming surface forming the inlet-side intersection point and the inner peripheral surface on the inlet side of the opening portion in the cross-sectional view satisfies 0 ° < θ 1 ≦ 90 °.

2. The diaphragm valve of claim 1, wherein,

when a length between the entrance-side inflection point and the entrance-side intersection point in a direction from the entrance toward the exit is L1, and a length from the entrance to the abutment portion in the direction from the entrance toward the exit is L2, 0.03 ≦ L1/L2 ≦ 0.45 is satisfied.

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

in the cross-sectional view at the center in the width direction of the flow path, the outlet-side flow path is formed by a 3 rd flow path forming surface provided on the opening portion side and a 4 th flow path forming surface provided on the opposite side of the opening portion,

an exit-side inflection point which is an inflection point of a line of the 4 th flow channel forming surface in the sectional view is disposed closer to the entrance side or the exit side than an exit-side intersection point which is an intersection point of the inner peripheral surface of the exit side of the opening portion and the 3 rd flow channel forming surface in the sectional view,

the exit-side intersection point is arranged closer to the opening portion side than the exit-side inflection point,

an angle θ 2 between the 3 rd flow passage forming surface forming the outlet-side intersection point and the inner peripheral surface of the outlet side of the opening portion in the cross-sectional view is 0 ° < θ 2 ≦ 90 °.

4. The diaphragm valve of claim 3, wherein,

when a length between the exit-side inflection point and the exit-side intersection point in a direction from the inlet toward the outlet is set to L3, and a length from the abutment portion to the outlet in the direction from the inlet toward the outlet is set to L4, 0.03. ltoreq.L 3/L4. ltoreq.0.4 is satisfied.

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

the drive mechanism includes:

a shaft member supported by the cover;

a pressing portion attached to the shaft member and connected to the valve portion; and

a driving section that drives the shaft member;

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, in the diaphragm valve disclosed in patent document 1, the flow direction of the fluid is forcibly changed from the portion where the inlet faces the diaphragm, and thus a pressure loss may occur.

The invention aims to provide a diaphragm valve capable of reducing pressure loss.

Means for solving the problems

In order to achieve the above object, a diaphragm valve according to claim 1 includes a valve main body, a valve portion, a lid portion, and a drive mechanism. The valve body has a flow path, an opening portion, and a contact portion. The flow path connects the inlet and the outlet which are oppositely arranged and 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 cover the opening portion, and blocks the flow path by contacting the contact portion. The cover is fixed to the valve body so as to cover the valve portion. The drive mechanism opens and closes the flow path by driving the valve portion. The flow path has: an inlet-side flow path formed from the inlet to the contact portion; and an outlet-side flow path formed from the contact portion to the outlet. In a cross-sectional view at the center in the width direction of the flow path, an inlet-side flow path is formed by a 1 st flow path forming surface provided on the opening portion side and a 2 nd flow path forming surface provided on the opposite side of the opening portion. An inlet-side inflection point which is an inflection point of a line in a sectional view of the 2 nd flow channel forming surface is disposed closer to the inlet side or the outlet side than an inlet-side intersection point which is an intersection point of the inner peripheral surface on the inlet side of the opening and the 1 st flow channel forming surface in the sectional view. The entrance-side intersection point is arranged closer to the opening side than the entrance-side inflection point. An angle theta 1 between a 1 st flow passage forming surface forming the inlet-side intersection point and the inner peripheral surface on the inlet side of the opening portion in a cross-sectional view satisfies 0 DEG < theta 1 DEG.ltoreq.90 deg.

In this way, by making the position of the inlet-side inflection point in the direction from the inlet toward the outlet in the side view different from the position of the inlet-side intersection point and further setting the angle θ 1 to be greater than 0 ° and 90 ° or less, the fluid can move smoothly even if the direction changes in the flow path from the inlet to the contact portion. Therefore, the load applied to the lid portion and the valve portion by the fluid can be reduced, and the pressure loss can be reduced.

The diaphragm valve of claim 2 is the diaphragm valve of claim 1, wherein the diaphragm valve satisfies 0.03. ltoreq.L 1/L2. ltoreq.0.45, where L1 is a length between an inlet-side inflection point and an inlet-side intersection point in a direction from the inlet toward the outlet, and L2 is a length from the inlet to the abutment portion in the direction from the inlet toward the outlet.

By thus making L1 and L2 satisfy the ranges, the pressure loss can be reduced.

The diaphragm valve of claim 3 is the diaphragm valve of claim 1 or 2, wherein the outlet-side flow path is formed by a 3 rd flow path forming surface provided on the side of the opening and a 4 th flow path forming surface provided on the opposite side of the opening in a cross-sectional view at the center in the width direction of the flow path. An outlet-side inflection point which is an inflection point of a line in a sectional view of the 4 th flow channel forming surface is arranged closer to the inlet side or the outlet side than an outlet-side intersection point which is an intersection point of the inner peripheral surface on the outlet side of the opening and the 3 rd flow channel forming surface in the sectional view. The exit-side intersection point is arranged closer to the opening side than the exit-side inflection point. An angle theta 2 between a 3 rd flow passage forming surface forming the outlet side intersection point and the inner peripheral surface of the outlet side of the opening portion in a cross-sectional view satisfies 0 DEG < theta 2 DEG.ltoreq.90 deg.

In this way, by making the position of the exit-side inflection point in the direction from the inlet to the outlet in the side view different from the position of the exit-side intersection point and further setting the angle θ 2 to be greater than 0 ° and 90 ° or less, the fluid can move smoothly even if the direction changes in the flow path from the contact portion to the outlet. Therefore, the load applied to the lid portion and the valve portion by the fluid can be reduced, and the pressure loss can be reduced.

The diaphragm valve of claim 4 is the diaphragm valve of claim 3, wherein 0.03. ltoreq.L 3/L4. ltoreq.0.4 is satisfied where L3 denotes a length between an exit-side inflection point and an exit-side intersection point in a direction from the inlet to the outlet and L4 denotes a length from the contact portion to the outlet in the direction from the inlet to the outlet.

By thus making L3 and L4 satisfy the ranges, the pressure loss can be reduced.

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 shaft member, a pressing portion, and a driving portion. The shaft member is supported by the cover. The pressing portion is attached to the shaft member and connected to the valve portion. The driving section drives the shaft member. The driving section is of a manual type, an air-driven type, or an electric-driven type.

In this way, the flow path can be closed or opened by manually, pneumatically or electrically driving the shaft member.

Effects of the invention

According to the present invention, a diaphragm valve capable of reducing pressure loss 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 a schematic cross-sectional view showing a state in which the flow path is closed, and (b) is a schematic cross-sectional view showing a state in which the flow path is opened.

FIG. 9 is a table showing the results of calculating the pressure loss rate and the rate of change in velocity in examples 1 to 8 and comparative examples 1 to 4.

Fig. 10 is a sectional configuration diagram showing the structure of the valve main body of comparative example 5.

Fig. 11 is a graph showing the results of fluid analysis performed on the valve body of comparative example 5.

Fig. 12 is a graph showing the results of fluid analysis performed on the valve body of example 8.

Fig. 13 is a graph showing the results of fluid analysis performed on the valve body of comparative example 6.

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. The driving 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, and fig. 7 is a sectional view at the center in the width direction of the valve main body 11. Fig. 7 is a left-right reverse view of fig. 5.

The valve main body 11 may be made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), PVD F (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 21, the 2 nd end portion 22 and the central portion 23 are integrally formed, 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 part 23)

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. An opening 31a is formed with its periphery curved. A direction along a line connecting the inlet 24a to the outlet 24b is defined as a direction X, and a direction perpendicular to the 1 st direction X and parallel to the 1 st surface 31 is defined as a 2 nd direction Y (may also be referred to as a width direction Y). The 1 st direction X can also be considered to be 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.

(flow path 24)

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 to be inclined with respect to the flow path 24 such that the inner surface of the flow path 24 gradually rises toward the 1 st surface 31. 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 distal end portion 33 a; an outlet-side flow path 242 formed from the outlet 24b of the 2 nd end 22 to the tip end 33 a; 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 distal end 33 a. 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.

Of the inner surfaces of the 1 st end portion 21 and the central portion 23 facing the inlet side channel 241, the inner surface portion on the 1 st surface 31 side shown in the cross-sectional view of fig. 7 is referred to as a 1 st channel forming surface 35, and the inner surface portion on the 2 nd surface 32 side is referred to as a 2 nd channel forming surface 36. The inlet-side flow path 241 is formed by the 1 st flow path forming surface 35 and the 2 nd flow path forming surface 36.

In the cross-sectional view of fig. 7, the 1 st flow channel formation surface 35 is formed substantially perpendicular to the inlet 24a and the outlet 24 b. An end point of the inner peripheral surface 31c on the inlet 24a side of the opening 31a on the flow path 24 side, that is, an intersection of the inner peripheral surface 31c on the inlet 24a side of the opening 31a and the 1 st flow path forming surface 35 forms an inlet side contact point 31d with the fluid flowing through the flow path 24. In fig. 7, the angle θ 1 between the 1 st flow path formation surface 35 and the inner peripheral surface 31c at the inlet-side contact point 31d satisfies 0 ° < θ 1 ≦ 90 °. Thereby, the diaphragm 12 is bent along the inner peripheral surface 31c when being bent convexly toward the 2 nd surface 32 side by the compressor 61 (described below), and thus the stress applied to the diaphragm 12 at the inlet-side contact point 31d can be reduced.

As shown in the sectional view of fig. 7, the 2 nd flow channel formation surface 36 has an entrance-side inflection point 36 a. The 2 nd flow path forming surface 36 has a 1 st portion 36b from the inlet 24a to the inlet inflection point 36a and a 2 nd portion 36c from the inlet inflection point 36a to the tip end 33 a. The 1 st portion 36b is formed to be curved convexly toward the 2 nd surface 32 side so as to approach the 1 st surface 31 from the inlet 24a toward the distal end portion 33 a. The 2 nd portion 36c is formed by being curved toward the 1 st surface 31 side from the entrance-side inflection point 36a to approach the 1 st surface 31.

The entrance-side contact point 31d is disposed closer to the 1 st surface 31 than the entrance-side inflection point 36 a. Specifically, in the direction perpendicular to the 1 st surface 31 (opening 31a), the distance from the 1 st surface 31 to the entrance-side contact point 31d is shorter than the distance from the 1 st surface 31 to the entrance-side inflection point 36 a.

Further, in the arrow X direction, the inlet-side contact point 31d and the inlet-side inflection point 36a are not located at the same position, and the inlet-side inflection point 36a is located on the leading end portion 33a side (also referred to as the outlet 24b side) of the inlet-side contact point 31 d. The entrance-side inflection point 36a may be located closer to the entrance 24a than the entrance-side contact point 31 d.

More preferably, the length between the entrance-side contact point 31d and the entrance-side inflection point 36a in the arrow X direction is L1, and the length from the entrance 24a to the distal end portion 33a in the arrow X direction is L2, which satisfies 0.03 ≦ L1/L2 ≦ 0.45.

In the valve body 11 of the diaphragm valve 10 of the present embodiment, the basic configuration from the inlet 24a to the distal end portion 33a is bilaterally symmetrical to the basic configuration from the outlet 24b to the distal end portion 33 a. Hereinafter, the contact point and the inflection point on the outlet 24b side will be described, but the same configuration as that on the inlet 24a side will be obtained. Since the diaphragm valve 10 of the present embodiment is bilaterally symmetric, L2 is half the length of the diaphragm valve 10 (also referred to as the valve half length).

That is, of the inner surfaces of the 2 nd end portion 22 and the central portion 23 facing the outlet side flow passage 242, the inner surface portion on the 1 st surface 31 side shown in the cross-sectional view of fig. 7 is defined as the 3 rd flow passage forming surface 37, and the inner surface portion on the 2 nd surface 32 side is defined as the 4 th flow passage forming surface 38. The outlet side channel 242 is formed by the 3 rd channel forming surface 37 and the 4 th channel forming surface 38.

In the cross-sectional view of fig. 7, the 3 rd flow channel formation surface 37 is formed substantially perpendicular to the inlet 24a and the outlet 24 b. An end point of the inner peripheral surface 31e on the outlet 24b side of the opening 31a on the flow path 24 side, that is, an intersection of the inner peripheral surface 31e on the outlet 24b side of the opening 31a and the 3 rd flow path forming surface 37 forms an outlet side contact point 31f with the fluid flowing through the flow path 24. In fig. 7, an angle (also referred to as a contact angle) θ 2 between the 3 rd flow passage forming surface 37 and the inner peripheral surface 31e at the outlet-side contact point 31f satisfies 0 ° < θ 2 ≦ 90 °. Thereby, the diaphragm 12 is bent along the inner peripheral surface 31c when being bent convexly toward the 2 nd surface 32 side by the compressor 61 (described below), and thus the stress applied to the diaphragm 12 at the inlet-side contact point 31d can be reduced.

As shown in the sectional view of fig. 7, the 4 th flow channel formation surface 38 has an exit-side inflection point 38 a. The 4 th flow channel forming surface 38 has a 1 st portion 38b from the outlet 24b to the outlet-side inflection point 38a and a 2 nd portion 38c from the outlet-side inflection point 38a to the tip portion 33 a. The 1 st portion 38b is formed by being curved convexly toward the 2 nd surface 32 side so as to approach the 1 st surface 31 from the inlet 24a toward the distal end portion 33 a. The 2 nd portion 38c is formed by being bent toward the 1 st surface 31 side from the exit-side inflection point 38a so as to approach the 1 st surface 31.

The exit-side contact point 31f is disposed closer to the 1 st surface 31 than the exit-side inflection point 38 a. Specifically, in the direction perpendicular to the 1 st surface 31 (opening 31a), the distance from the 1 st surface 31 to the exit-side contact point 31f is shorter than the distance from the 1 st surface 31 to the exit-side inflection point 38 a.

Further, the outlet-side contact point 31f and the outlet-side inflection point 38a do not coincide in position in the arrow X direction, and the outlet-side inflection point 38a is disposed closer to the leading end 33a (the inlet 24a) than the outlet-side contact point 31 f. The exit-side inflection point 38a may be disposed closer to the exit 24b than the exit-side contact point 31 f.

More preferably, the length between the exit-side contact point 31f and the exit-side inflection point 38a in the arrow X direction is L3, and the length from the exit 24b to the leading end 33a in the arrow X direction is L4, which satisfy 0.03 ≦ L3/L4 ≦ 0.45.

(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 39 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 39 to the other outer edge portion 39.

As shown in fig. 6, the 1 st and 2 nd ribs 41 and 42 intersect each other at the center, i.e., the center portion 43 in a cross shape in a plan view.

(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. 8(a) and 8(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 where the flow path 24 is opened as shown in fig. 8(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. 8(b), the diaphragm 12 is curved convexly 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 also rises together with the rise of the rod 63, and the center portion of the diaphragm 12 engaged with the compressor 61 rises as shown in fig. 8 (a).

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

<3. example >

Next, embodiments of the present invention will be described with reference to examples.

In the following examples, the diaphragm valve 10 having L1 ═ L3, L2 ═ L4, and θ 1 ═ θ 2 was used.

FIG. 9 is a table showing the pressure loss rate and the rate of change in velocity calculated by analyzing the valve body with the changed L1/L2. The valve half length indicates a half length of the valve body 11, and in the present embodiment, L2 is L4, so that the valve half lengths are L2 and L4. In examples 1 to 8 and comparative examples 2 to 4 shown in fig. 9, the inlet-side inflection point 36a is located closer to the tip end 33a than the inlet-side contact point 31d, and the outlet-side inflection point 38a is located closer to the tip end 33a than the outlet-side contact point 31f, but the same result is obtained even if the inlet-side inflection point 36a is located closer to the inlet 24a (opposite side to the tip end 33 a) than the inlet-side contact point 31d, and the outlet-side inflection point 38a is located closer to the outlet 24b (opposite side to the tip end 33 a) than the outlet-side contact point 31 f.

Regarding the pressure loss rate, a case where the loss rate of the inlet 24a and the outlet 24b is 20% or less is determined as good (o), a case where the loss rate is 30% or less is determined as normal (Δ), and a case where the loss rate is more than 30% is determined as bad (x). In the fluid analysis, a case where the rate of change of the speed in the diaphragm valve is 20% or less is determined as good (o), a case where the rate of change of the speed is 30% or less is determined as normal (Δ), and a case where the rate of change of the speed is more than 30% is determined as bad (x).

In the diaphragm valve of comparative example 1, when (L1/L2) is 0, that is, when the position of the inlet-side contact point 31d coincides with the position of the tip end 33a in the arrow X direction and the position of the outlet-side inflection point 38a coincides with the position of the outlet-side contact point 31f, both the pressure loss rate and the rate of change in velocity are defective, and the overall judgment is defective.

In the case where the diaphragm valve of comparative example 2 was L1/L2 of 0.01 (percentage: 1%), the pressure loss rate was normal, but the rate of change in speed was poor, and the overall judgment was poor.

In the case where the diaphragm valve of comparative example 3 was 0.02 (percentage: 2%) in terms of L1/L2, both the pressure loss rate and the rate of change in speed became ordinary, and the overall judgment became defective.