JPWO2019151491A1 - Diaphragm valve - Google Patents

Abstract

In the diaphragm valve (10), in the cross-sectional view at the center of the flow path (24) in the width direction Y, the inlet side flow path (241) is the first flow path forming surface (35) provided on the opening (31a) side. And a second flow path forming surface (36) provided on the opposite side of the opening (31a). The inflection point (36a) on the inlet side, which is the inflection point of the line in the cross-sectional view of the second flow path forming surface (36), is the inner peripheral surface (31c) on the inlet (24a) side of the opening (31a) and the first. It is arranged on the outlet (24b) side of the inlet side contact point (31d), which is an intersection in cross-sectional view with the flow path forming surface (35). The inlet side contact point (31d) is arranged closer to the opening (31a) than the inlet side inflection point (36a). The angle θ1 between the first flow path forming surface (35) forming the inlet side contact point (31d) and the inner peripheral surface (31c) on the inlet (24a) side of the opening (31a) is 0 ° <θ1. Satisfy ≤90 °.

Description

The present invention relates to a diaphragm valve.

A diaphragm valve is provided in a piping line in a plant such as water treatment, chemicals, or food, and the diaphragm valve controls the fluid flowing through the piping (see, for example, Patent Document 1).

In such a diaphragm valve, pipes are connected at both ends and installed in the plant. In the diaphragm valve, the flow path is closed when the diaphragm is pressed against the partition wall, and the flow path is opened when the diaphragm is separated from the partition wall.

JP-A-2009-121547

However, in the diaphragm valve shown in Patent Document 1, the direction of the fluid flow is forcibly changed from the inflow port toward the portion where the diaphragm abuts, so that a pressure loss may occur.

An object of the present invention is to provide a diaphragm valve capable of reducing pressure loss.
(Means to solve problems)
In order to achieve the above object, the diaphragm valve according to the first invention includes a valve body, a valve portion, a lid portion, and a drive mechanism. The valve body has a flow path, an opening, and a contact portion. The flow path is formed inside by connecting the inlet and the outlet provided so as to face each other. 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 arranged so as to close the opening, and the flow path can be closed by contacting the contact portion. The lid is fixed to the valve body so as to cover the valve. 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, the inlet side flow path is formed by a first flow path forming surface provided on the opening side and a second flow path forming surface provided on the opposite side of the opening. Has been done. The inflection point on the entrance side, which is the inflection point of the line in the cross-sectional view of the second flow path forming surface, is the entrance side, which is the intersection of the inner peripheral surface on the entrance side of the opening and the first flow path forming surface in the cross-sectional view. It is located on the entrance side or exit side of the intersection. The entrance side intersection is arranged on the opening side of the entrance side inflection point. The angle θ1 in the cross-sectional view of the first flow path forming surface forming the entrance side intersection and the inner peripheral surface on the entrance side of the opening satisfies 0 ° <θ1 ≦ 90 °.

In this way, the position of the inflection point on the entrance side in the direction from the entrance to the exit in the side view is different from the position of the intersection on the entrance side, and the angle θ1 is set to be larger than 0 ° and 90 or less. The fluid can move smoothly even if the direction is changed in the flow path from the contact portion to the contact portion. Therefore, the load on the lid and the valve given by the fluid can be reduced, and the pressure loss can be reduced.

The diaphragm valve according to the second invention is the diaphragm valve according to the first invention, in which the length between the inlet side inflection point and the inlet side intersection in the direction from the inlet to the outlet is L1, and the length is from the inlet to the outlet. Assuming that the length from the inlet to the contact portion in the direction toward the direction is L2, 0.03 ≦ L1 / L2 ≦ 0.45 is satisfied.
As described above, when L1 and L2 satisfy the above range, the pressure loss can be reduced.

The diaphragm valve according to the third invention is the diaphragm valve according to the first or second invention, and the outlet side flow path is provided on the opening side in a cross-sectional view at the center in the width direction of the flow path. It is formed by a third flow path forming surface and a fourth flow path forming surface provided on the opposite side of the opening. The exit side inflection point, which is the inflection point of the line in the cross-sectional view of the fourth flow path forming surface, is the exit side, which is the intersection of the inner peripheral surface on the exit side of the opening and the third flow path forming surface in the cross-sectional view. It is located on the entrance side or exit side of the intersection. The exit side intersection is arranged on the opening side of the exit side inflection point. The angle θ2 in the cross-sectional view of the third flow path forming surface forming the exit-side intersection and the inner peripheral surface on the exit side of the opening satisfies 0 ° <θ2 ≦ 90 °.

In this way, by making the position of the exit side inflection point different from the position of the exit side intersection in the direction from the entrance to the exit in the side view, and further setting the angle θ2 to be greater than 0 ° and 90 or less. The fluid can move smoothly even if the direction is changed in the flow path from the contact portion to the outlet. Therefore, the load on the lid and the valve given by the fluid can be reduced, and the pressure loss can be reduced.

The diaphragm valve according to the fourth invention is the diaphragm valve according to the third invention, in which the length between the exit side inflection point and the exit side intersection in the direction from the inlet to the outlet is L3, and the length is from the inlet to the outlet. Assuming that the length from the contact portion to the outlet in the direction toward the outlet is L4, 0.03 ≦ L3 / L4 ≦ 0.4 is satisfied.
As described above, when L3 and L4 satisfy the above range, the pressure loss can be reduced.

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

In this way, the shaft member can be driven manually, by air or electricity, and the flow path is closed or opened.
(The invention's effect)
According to the present invention, it is possible to provide a diaphragm valve capable of reducing pressure loss.

The perspective view of the diaphragm valve of the embodiment which concerns on this invention. FIG. 1 is a partial cross-sectional view of the diaphragm valve of FIG. A perspective view of the valve body of FIG. 1 as viewed from above. A perspective view of the valve body of FIG. 1 as viewed from below. The front view of the valve body of FIG. The bottom view of the valve body of FIG. FIG. 6 is a cross-sectional view taken along the line between AA'in FIG. (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 figure which shows the table of the result of having calculated the pressure loss rate and the rate change rate in Examples 1-8 and Comparative Examples 1-4. FIG. 5 is a cross-sectional configuration diagram showing a structure of a valve body of Comparative Example 5. The figure which shows the result of having performed the fluid analysis about the valve body of the comparative example 5. The figure which shows the result of having performed the fluid analysis about the valve body of Example 8. The figure which performed the fluid analysis about the valve body of the comparative example 6 and shows the result.

Hereinafter, the diaphragm valve according to the embodiment of the present invention will be described with reference to the drawings.
<1. Configuration>
FIG. 1 is an external perspective view of the diaphragm valve 10 according to the embodiment of the present invention. FIG. 2 is a partial cross-sectional configuration diagram of the diaphragm valve 10 of the present embodiment.

As shown in FIGS. 1 and 2, the diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12, a bonnet 13, and a drive mechanism 14. Piping is 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 shuts off the flow path 24. The bonnet 13 is attached to the valve body 11 so as to cover the diaphragm 12. A part of the drive mechanism 14 is arranged in the bonnet 13 and drives the diaphragm 12.

(Valve body 11)
FIG. 3 is a perspective view of the valve body 11 as viewed from the first surface 31 side, which will be described later. FIG. 4 is a perspective view of the valve body 11 as viewed from the second surface 32 side, which will be described later. FIG. 5 is a front view of the valve body 11, and FIG. 6 is a bottom view of the valve body 11. FIG. 7 is a cross-sectional view taken along the line between AA'of FIG. 6, and FIG. 7 is a cross-sectional view of the center of the valve body 11 in the width direction. Further, FIG. 7 is left-right reversed from FIG.

The valve body 11 is a PVC (polyvinyl chloride), HT (heat resistant vinyl chloride tube), PP (polypropylene), or PVCF (polyfluoride bunilidene), polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer. , Polychlorotrifluoroethylene or the like, or metal such as iron, copper, copper alloy, brass, aluminum, stainless steel, or porcelain.

As shown in FIG. 3, the valve body 11 has a first end portion 21, a second end portion 22, a central portion 23, and a flow path 24.
The 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 second end as shown in FIG. It is formed over the portions 22.

(1st end 21, 2nd end 22)
As shown in FIGS. 3 and 4, the first end portion 21 and the second end portion 22 are arranged so as to sandwich the central portion 23 and are connected to the central portion 23.

As shown in FIG. 3, the first end portion 21 has a first flange portion 211 to which the pipe is connected, and a first connection portion 212 connecting the first flange portion 211 and the central portion 23. As shown in FIG. 4, the first flange portion 211 has a first flange surface 213 on which an inlet 24a through which a fluid flows into the valve body 11 is formed, and a pipe can be connected to the first flange portion 211.

Further, as shown in FIG. 4, the second end portion 22 has a second flange portion 221 to which the pipe is connected, and a second connecting portion 222 connecting the second flange portion 221 and the central portion 23. As shown in FIG. 3, the second flange portion 221 has a second flange surface 223 on which an outlet 24b through which a fluid is discharged from the valve body 11 is formed, and a pipe can be connected to the second flange portion 221.

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

(Central part 23)
As shown in FIG. 5, the central portion 23 is provided between the first end portion 21 and the second end portion 22. The central portion 23 has a first surface 31, a second surface 32, a wall portion 33 (see FIG. 7), and a rib 34.

As shown in FIG. 3, the first surface 31 has a substantially planar shape, and is formed perpendicular to the first flange surface 213 and the second flange surface 223. An opening 31a is formed in the center of the first surface 31. The peripheral edge of the opening 31a is curved. The direction along the line connecting the inlet 24a and the outlet 24b is defined as the direction X, and the direction perpendicular to the first direction X and parallel to the first surface 31 is defined as the second direction Y (also referred to as the width direction Y). .. The first direction X can be said to be a direction along a straight line perpendicular to the first flange surface 213 and the second flange surface 223.

As shown in FIG. 5, the second surface 32 is a surface facing the first surface 31 with the flow path 24 interposed therebetween. The second surface 32 is formed along the shape of the flow path 24. The 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. 7, 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 is gently raised toward the first surface 31 so as to form an inclination in the flow path 24. The above-mentioned opening 31a is formed at a position corresponding to the wall portion 33. A diaphragm 12, which will be described later, is pressed against the tip 33a on the first surface 31 side of the wall 33.

The flow path 24 includes an inlet side flow path 241 formed from the inlet 24a of the first end 21 to the tip 33a, and an outlet side flow path 241 formed from the outlet 24b of the second end 22 to the tip 33a. It has a 242 and a communication portion 243 that communicates the inlet side flow path 241 and the outlet side flow path 242.

As shown in FIG. 7, the width of the inlet side flow path 241 in the direction perpendicular to the first surface 31 becomes narrower toward the wall portion 33. On the other hand, the width of the inlet-side flow path 241 in the direction parallel to the first surface 31 (the direction perpendicular to the paper surface in FIG. 7) becomes wider toward the wall portion 33.

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

The communication 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. 4, the second surface 32 has an inlet side curved portion 321 along the inlet side flow path 241 and an outlet side curved portion 322 along the outlet side flow path 242. The inlet side curved portion 321 and the outlet side curved portion 322 form a protrusion of the wall portion 33 shown in FIG. 7 toward the first surface 31 side.

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

In the cross-sectional view of FIG. 7, the first flow path forming surface 35 is formed substantially perpendicular to the inlet 24a and the outlet 24b. The 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, the intersection of the inner peripheral surface 31c on the inlet 24a side of the opening 31a with the first flow path forming surface 35 flows through the flow path 24. The inlet side contact point 31d with the fluid is formed. In FIG. 7, the angle θ1 formed by the first flow path forming surface 35 and the inner peripheral surface 31c at the inlet side contact point 31d satisfies 0 ° <θ1 ≦ 90 °. As a result, when the diaphragm 12 is convexly curved toward the second surface 32 side by the compressor 61 (described later), it is curved along the inner peripheral surface 31c, so that the stress applied to the diaphragm 12 at the inlet side contact point 31d is reduced. be able to.

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

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

Further, in the direction of arrow X, the positions of the inlet side inflection point 31d and the inlet side inflection point 36a do not match, and the inlet side inflection point 36a is on the tip 33a side (outlet 24b side) of the inlet side contact point 31d. It can be said that it is located in). The inflection point 36a on the inlet side may be located closer to the inlet 24a than the contact point 31d on the inlet side.

Further, assuming that the length between the inlet side contact point 31d and the inlet side inflection point 36a in the arrow X direction is L1 and the length from the inlet 24a to the tip 33a in the arrow X direction is L2, 0.03 ≦ It is more preferable to satisfy L1 / L2 ≦ 0.45.

In the valve body 11 of the diaphragm valve 10 of the present embodiment, the basic configuration from the inlet 24a to the tip 33a is symmetrical with the basic configuration from the outlet 24b to the tip 33a. The contact point and the inflection point on the outlet 24b side will be described below, but the configuration is the same as that on the inlet 24a side described above. Since the diaphragm valve 10 of the present embodiment is symmetrical, L2 has a length half that of the diaphragm valve 10 (also referred to as a valve half length).

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

In the cross-sectional view of FIG. 7, the third flow path forming surface 37 is formed substantially perpendicular to the inlet 24a and the outlet 24b. The 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, the intersection of the inner peripheral surface 31e on the outlet 24b side of the opening 31a with the third flow path forming surface 37 flows through the flow path 24. An outlet-side contact point 31f with the fluid is formed. In FIG. 7, the angle (also referred to as the contact angle) θ2 formed by the third flow path forming surface 37 and the inner peripheral surface 31e at the outlet side contact point 31f satisfies 0 ° <θ2 ≦ 90 °. As a result, when the diaphragm 12 is convexly curved toward the second surface 32 side by the compressor 61 (described later), it is curved along the inner peripheral surface 31c, so that the stress applied to the diaphragm 12 at the inlet side contact point 31d is reduced. be able to.

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

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

Further, in the direction of arrow X, the positions of the exit side inflection point 31f and the exit side inflection point 38a do not match, and the exit side inflection point 38a is on the tip 33a side (inlet 24a side) of the exit side contact point 31f. ) Is placed. The exit side inflection point 38a may be arranged on the outlet side 24b side from the exit side contact point 31f.

Further, assuming that 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 outlet 24b to the tip portion 33a in the arrow X direction is L4, 0.03 ≦ It is more preferable to satisfy L3 / L4 ≦ 0.45.

(Rib 34)
As shown in FIGS. 4 and 6, the rib 34 is formed so as to project from the second surface 32 perpendicularly to the first surface 31. The rib 34 has a first rib 41 and a second rib 42.

As shown in FIGS. 4 and 6, the first rib 41 is formed from the inlet side curved portion 321 to the outlet side curved portion 322 on the second surface 32 along the first direction X. Further, the first rib 41 is provided at the center of the central portion 23 in the second direction Y.

The second rib 42 is formed along the second direction Y and is provided at the center of the central portion 23 in the first direction X.
Further, an outer edge portion 39 is formed from each end of the first surface 31 in the second direction Y toward the second surface 32 side, and the second rib 42 is formed from one outer edge portion 39 to the other outer edge portion 39. Is formed up to.
The first rib 41 and the second rib 42 intersect in a cross shape in a plan view at the central portion 43, which is the center of each, as shown in FIG.

(Diaphragm 12)
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 deformation or breakage of the diaphragm 12 when a fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed.

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

The diaphragm 12 moves downward by a drive mechanism 14 described later, and abuts on the tip 33a of the wall 33 to close the communication portion 243 and close the flow path 24. Further, the diaphragm 12 is moved upward by the drive mechanism 14, and the diaphragm 12 is separated from the tip portion 33a, so that the flow path 24 is opened.

(Bonnet 13)
Similar to the valve body 11, the bonnet 13 is made of PVC (polyvinyl chloride), HT (heat resistant vinyl chloride tube), PP (polypropylene), or PVCF (polyfluoride bunilidene), polystyrene, ABS resin, polytetrafluoroethylene, par. It can be formed of a fluoroalkyl vinyl ether copolymer, a resin such as polychlorotrifluoroethylene, a metal such as iron, copper, copper alloy, brass, aluminum, or stainless steel, or porcelain.

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

(Drive mechanism 14)
The drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, and a handle 64.

The compressor 61 is formed of PVDF (polyvinylidene fluoride) or the like, and is connected to the diaphragm 12. An engaging member 65 is embedded in the diaphragm 12, and the engaging member 65 projects to the opposite side (non-contact surface side) of the valve body 11. The protruding portion of the engaging member 65 is engaged with the compressor 61, and the compressor 61 and the diaphragm 12 are connected to each other.

The sleeve 62 is supported by the through hole 13b of the bonnet 13. A screw shape is formed inside the sleeve 62.
The stem 63 is located 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 stem 63 arranged inside the bonnet 13. The compressor 61 is engaged with the diaphragm 12 on the valve body 11 side and fixed to the stem 63 on the side opposite to the valve body 11.
The handle 64 is fitted to the outer peripheral portion of the portion of the stem 63 located outside the bonnet 13.

<2. Operation>
Next, the operation of the diaphragm valve 10 of the present embodiment will be described. 8 (a) and 8 (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. 8A, the stem 63 is lowered 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 side and is pressed against the tip portion 33a of the wall portion 33, as shown in FIG. 8B.
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. 8A.
As a result, the flow path 24 of the diaphragm valve 10 is opened.

<3. Example>
Next, an embodiment according to the present invention will be described with reference to examples.

In the following examples, the diaphragm valve 10 with L1 = L3, L2 = L4, and θ1 = θ2 is used.
FIG. 9 is a table showing the pressure loss rate and the speed change rate calculated by analyzing the valve body in which L1 / L2 is changed. The valve half length indicates half the length of the valve body 11, and since L2 = L4 in the present embodiment, the valve half length = L2 and L4. Further, in Examples 1 to 8 and Comparative Examples 2 to 4 shown in FIG. 9, the inflection point 36a on the inlet side is located closer to the tip portion 33a than the contact point 31d on the inlet side, and the inflection point 38a on the exit side is on the outlet side. Although it is located closer to the tip 33a than the contact point 31f, the inlet side inflection point 36a is located closer to the inlet 24a (opposite the tip 33a) than the inlet side contact point 31d, and the exit side inflection point The same result is obtained even if 38a is located on the outlet 24b side (opposite side of the tip portion 33a) from the outlet side contact point 31f.

Regarding the pressure loss rate, the case where the loss rate of the inlet 24a and the outlet 24b is 20% or less is regarded as good (◯), the case where the loss rate is 30% or less is regarded as normal (Δ), and the loss rate is more than 30%. If it is large, it is judged as defective (x). Regarding fluid analysis, the case where the velocity change rate in the diaphragm valve is 20% or less is regarded as good (○), the case where the velocity change rate is 30% or less is regarded as normal (Δ), and the velocity change rate is from 30%. If it is also large, it is judged as defective (x).

In the diaphragm valve of Comparative Example 1, when (L1 / L2) is 0, that is, the positions of the inlet side contact point 31d and the tip portion 33a in the arrow X direction coincide with each other, and the outlet side inflection point 38a and the outlet side contact point In the case where the positions of 31f match, both the pressure loss rate and the speed change rate are poor, and the overall judgment is poor.

In the diaphragm valve of Comparative Example 2, when L1 / L2 was 0.01 (1% in percentage), the pressure loss rate was normal, but the speed change rate was poor, and the overall judgment was poor.
In the diaphragm valve of Comparative Example 3, when L1 / L2 was 0.02 (2% in percentage), both the pressure loss rate and the speed change rate were normal, and the overall judgment was poor.

In the diaphragm valve of Example 1, when L1 / L2 was 0.03 (3% in percentage), the pressure loss rate was normal, the speed change rate was good, and the overall judgment was good.
In the diaphragm valve of Example 2, when L1 / L2 was 0.04 (4% in percentage), the pressure loss rate was normal, the speed change rate was good, and the overall judgment was good.

In the diaphragm valve of Example 3, when L1 / L2 was 0.05 (5% in percentage), the pressure loss rate was normal, the speed change rate was good, and the overall judgment was good.
In the diaphragm valve of Example 4, when L1 / L2 was 0.10 (10% in percentage), both the pressure loss rate and the speed change rate were good, and the overall judgment was good.

In the diaphragm valve of Example 5, when L1 / L2 was 0.20 (20% in percentage), both the pressure loss rate and the speed change rate were good, and the overall judgment was good.
In the diaphragm valve of Example 6, when L1 / L2 was 0.30 (30% in percentage), both the pressure loss rate and the speed change rate were good, and the overall judgment was good.

In the diaphragm valve of Example 7, when L1 / L2 was 0.40 (40% in percentage), both the pressure loss rate and the speed change rate were good, and the overall judgment was good.
In the diaphragm valve of Example 8, when L1 / L2 was 0.45 (30% in percentage), both the pressure loss rate and the speed change rate were good, and the overall judgment was good.

The diaphragm valve of Comparative Example 4 had a normal pressure loss rate when L1 / L2 was 0.50 (50% in percentage), but the speed change rate was poor, and the overall judgment was poor.
From the above, it can be seen that good results can be obtained when 0.03 ≦ L1 / L2 ≦ 0.45.

Next, the effects of the angle θ1 (= θ2) and the inflection point will be described with reference to Example 9, Comparative Examples 5 and 6.
FIG. 10 is a cross-sectional view showing the structure of the valve body 1011 of Comparative Example 5. As shown in the cross-sectional view of FIG. 10, the second flow path forming surface 1036 on the second surface 32 side of the inlet side flow path 1241 of the valve body 1011 is formed in a straight line, and is modified as in the present embodiment. There are no inflection points. Further, similarly to the second flow path forming surface 1036, the fourth flow path forming surface 1038 on the second surface 32 side of the outlet side flow path 1242 of the valve body 1011 is formed in a straight line, and the fourth flow path forming surface 1038 of the present embodiment is formed. There is no such inflection point. In FIG. 10, the wall portion 1033 and the tip portion 1033a are shown. The angle θ1 (= θ2) is set to 90 °.

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

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

In FIG. 12, it can be seen that the pressure in the inlet side flow path 241 is small and the pressure loss is suppressed.
As a result, it can be seen that the pressure loss can be reduced by providing the inlet side inflection point 36a and the outlet side inflection point 38a.

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

From this, it can be seen that the angle θ1 (= θ2) is preferably 90 ° or less.
As described above, as described in the embodiments and examples, by carrying out the above, not only the pressure loss is reduced, but also the wearability of the slurry is suppressed and the resin fluidity at the time of injection molding is improved, so that the transferability is improved and the moldability is improved. Has the effect of Further, by relaxing the stress when the load is loaded from the diaphragm when the valve is closed, the strength is improved and the driving part of the injection molding die is simplified, which is excellent in economy.

<4. Features, etc.>
(4-1)
The diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12 (an example of a valve portion), a bonnet 13 (an example of a lid portion), and a drive mechanism 14. The valve body 11 has a flow path 24, an opening 31a (an example of an opening), and a tip 33a (an example of an abutting portion). The flow path 24 is formed inside by connecting the inlet 24a and the outlet 24b provided so as to face each other. The opening 31a is formed in the middle of the flow path 24. The wall portion 33 is provided at a position corresponding to the opening 31a of the flow path 24. The diaphragm 12 is arranged so as to close the opening 31a, and the flow path 24 can be closed by contacting the wall portion 33. The bonnet 13 is fixed to the valve body 11 so as to cover the diaphragm 12. The drive mechanism 14 opens and closes the flow path 24 by driving the diaphragm 12. The flow path 24 has an inlet side flow path 241 formed from the inlet 24a to the tip 33a and an outlet side flow path 242 formed from the tip 33a to the outlet 24b. In a cross-sectional view at the center of the flow path 24 in the width direction Y, the inlet side flow path 241 has a first flow path forming surface 35 provided on the opening 31a side and a second flow path provided on the side opposite to the opening 31a. It is formed by the forming surface 36. The inflection point 36a on the inlet side, which is the inflection point of the line in the cross-sectional view of the second flow path forming surface 36, is the inflection point 36a on the inlet side of the opening 31a in the cross-sectional view of the inner peripheral surface 31c on the inlet 24a side and the first flow path forming surface 35. It is arranged on the inlet 24a side or the outlet 24b side of the entrance side contact point 31d (an example of the entrance side intersection) which is the intersection. The inlet side contact point 31d is arranged closer to the opening 31a than the inlet side inflection point 36a. The angle θ1 between the first flow path forming surface 35 forming the inlet side contact point 31d and the inner peripheral surface 31c on the inlet 24a side of the opening 31a satisfies 0 ° <θ ≦ 90 °.

In this way, the position of the inlet side inflection point 36a in the direction X from the inlet 24a to the exit 24b in the side view is different from the position of the inlet side contact point 31d, and the angle θ1 is made larger than 0 ° and 90 or less. By setting, the fluid can move smoothly even if the direction is changed in the inlet side flow path 241 from the inlet 24a to the tip 33a. Therefore, the load of the bonnet 13 and the diaphragm 12 given from the fluid can be reduced, and the pressure loss can be reduced.

(4-2)
In the diaphragm valve 10 of the present embodiment, the length between the inlet side inflection point 36a and the inlet side contact point 31d (an example of the inlet side intersection) in the direction from the inlet 24a to the outlet 24b is L1, and the length is from the inlet 24a. Assuming that the length from the inlet 24a to the tip 33a (an example of the contact portion) in the direction toward the outlet 24b is L2, 0.03 ≦ L1 / L2 ≦ 0.45 is satisfied.
As described above, when L1 and L2 satisfy the above range, the pressure loss can be reduced.

(4-3)
In the diaphragm valve 10 of the present embodiment, in the cross-sectional view in the center of the width direction Y of the flow path 24, the outlet side flow path 242 has a third flow path forming surface 37 provided on the opening 31a side and the opening 31a. It is formed by a fourth flow path forming surface 38 provided on the opposite side. The exit-side inflection point 38a, which is the inflection point of the line in the cross-sectional view of the fourth flow path forming surface 38, is the intersection of the inner peripheral surface 31e on the exit side of the opening 31a and the third flow path forming surface 37 in the cross-sectional view. It is arranged on the inlet 24a side or the outlet 24b side from the outlet side contact point 31f (an example of an exit side intersection). The outlet-side contact point 31f is arranged on the opening 31a side of the exit-side inflection point 38a. The angle θ2 in the cross-sectional view of the third flow path forming surface 37 forming the outlet side contact point 31f and the inner peripheral surface 31e on the outlet 24b side of the opening 31a satisfies 0 ° <θ2 ≦ 90 °.

In this way, the position of the exit side inflection point 38a in the direction from the inlet 24a to the exit 24b in the side view is made different from the position of the exit side contact point 31f, and the angle θ2 is set to 90 or less, which is larger than 0 °. By doing so, the fluid can move smoothly even if the direction is changed in the outlet side flow path 242 from the tip portion 33a to the outlet 24b. Therefore, the load of the bonnet 13 and the diaphragm 12 given from the fluid can be reduced, and the pressure loss can be reduced.

(4-4)
In the diaphragm valve 10 of the present embodiment, the length between the outlet side inflection point 38a and the outlet side contact point 31f (an example of the exit side intersection) in the direction from the inlet 24a to the outlet 24b is L3, and the length is from the inlet 24a. Assuming that the length from the tip portion 33a (an example of the contact portion) to the outlet 24b in the direction X toward the outlet 24b is L4, 0.03 ≦ L3 / L4 ≦ 0.4 is satisfied.
As described above, when L3 and L4 satisfy the above range, the pressure loss can be reduced.

(4-5)
In the diaphragm valve 10 of the present embodiment, the drive mechanism 14 has a stem 63 (an example of a shaft member), a compressor 61 (an example of a pressing portion), and a handle 64 (an example of a driving portion). The stem 63 is supported by a bonnet 13 (an example of a lid). The compressor 61 is attached to the stem 63 and is connected to the diaphragm 12 (an example of a valve portion). The handle 64 drives the stem 63. The handle 64 is a manual type.

In this way, the stem 63 can be manually driven, and the flow path 24 can be opened and closed.
[Other Embodiments]
Although 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 gist of the invention.

(A)
In the above embodiment, the shapes of the inlet side flow path 241 and the outlet side flow path 242 are symmetrical, but they do not have to be symmetrical. That is, the exit-side inflection point 38a does not have to be provided, and even when the exit-side inflection point 38a is provided, the exit-side inflection point 38a and the exit-side contact point 31f in the arrow X direction. The position of is not required to be displaced. Further, it is not necessary to satisfy 0 <θ2 ≦ 90.

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

(C)
Further, as described in the above embodiment, in the diaphragm valve 10 shown in FIG. 7, the inlet side inflection point 36a is arranged closer to the tip portion 33a than the inlet side contact point 31d, and the outlet side inflection point is arranged. The point 38a is arranged on the tip end portion 33a side of the outlet side contact point 31f, but the present invention is not limited to this. For example, the inlet side inflection point 36a may be arranged closer to the inlet 24a than the inlet side contact point 31d, and the exit side inflection point 38a may be arranged closer to the outlet 24b than the outlet side contact point 31f.

(D)
In the above embodiment, the second flow path forming surface 36 and the fourth flow path forming surface 38 are formed by two curves in the cross-sectional view of FIG. 7, but the present invention is not limited to this, and a straight line portion is provided. In short, it suffices if an inflection point is provided.

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

10: Diaphragm valve 24: Flow path 24a: Inlet 24b: Outlet 31a: Opening 31c: Inner peripheral surface 31d: Inlet side contact point 35: First flow path forming surface 36: Second flow path forming surface 36a: Inflection side point

Claims (5)

A flow path formed inside by connecting an inlet and an outlet provided so as to face each other, an opening formed in the middle of the flow path, and a contact provided at a position corresponding to the opening of the flow path. A valve body having a contact part,
A valve portion that is arranged so as to close the opening and can close the flow path by contacting the contact portion.
A lid fixed to the valve body so as to cover the valve body,
A drive mechanism that opens and closes the flow path by driving the valve portion is provided.
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, the inlet side flow path has a first flow path forming surface provided on the opening side and a second flow path provided on the side opposite to the opening. Formed by the forming surface,
The entrance side inflection point, which is the inflection point of the line in the cross-sectional view of the second flow path forming surface, is the cross-sectional view of the inner peripheral surface of the opening on the entrance side and the first flow path forming surface. It is arranged on the entrance side or the exit side from the entrance side intersection, which is the intersection in
The entrance side intersection is arranged on the opening side of the entrance side inflection point.
The angle θ1 between the first flow path forming surface forming the entrance side intersection and the inner peripheral surface on the entrance side of the opening in the cross-sectional view satisfies 0 ° <θ1 ≦ 90 °.
Diaphragm valve. The length between the inflection point on the entrance side and the intersection on the entrance side in the direction from the entrance to the exit is L1, and the length from the entrance to the contact portion in the direction from the entrance to the exit is defined as L1. If L2, 0.03 ≦ L1 / L2 ≦ 0.45 is satisfied.
The diaphragm valve according to claim 1. In the cross-sectional view at the center in the width direction of the flow path, the outlet side flow path is the third flow path forming surface provided on the opening side and the fourth flow path provided on the side opposite to the opening. Formed by the road forming surface,
The exit-side inflection point, which is the inflection point of the line in the cross-sectional view of the fourth flow path forming surface, is the cross-sectional view of the inner peripheral surface of the opening on the exit side and the third flow path forming surface. It is arranged on the entrance side or the exit side of the exit side intersection, which is the intersection in
The exit side intersection is arranged on the opening side of the exit side inflection point.
The angle θ2 in the cross-sectional view of the third flow path forming surface forming the exit side intersection and the inner peripheral surface of the outlet side of the opening satisfies 0 ° <θ2 ≦ 90 °.
The diaphragm valve according to claim 1 or 2. The length between the exit-side inflection point and the exit-side intersection in the direction from the inlet to the outlet is L3, and the length from the contact portion to the outlet in the direction from the inlet to the outlet is defined as L3. If L4, 0.03 ≦ L3 / L4 ≦ 0.4 is satisfied.
The diaphragm valve according to claim 3. The drive mechanism
The shaft member supported by the lid and
A pressing portion attached to the shaft member and connected to the valve portion,
It has a drive unit that drives the shaft member, and has
The drive unit is manually driven, pneumatically driven, or electrically driven.
The diaphragm valve according to any one of claims 1 to 4.

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