JP2020153519A - Diaphragm valve - Google Patents

Abstract

To provide a diaphragm valve capable of realizing both of water stop performance and long-term durability.SOLUTION: In a diaphragm valve 10, a diaphragm 12 has a first membrane separating member 210 and a second membrane separating member 220. The first membrane separating member 210 is arranged on a flow passage 24 side, and contains a fluororesin. The second membrane separating member 220 is arranged on the opposite side of the flow passage 24 of the first membrane separating member 210, and contains an elastic resin. When a thickness of the first membrane separating member 210 and a thickness of the second membrane separating member 220 at a membrane separating peripheral part 720 provided on the peripheral edge of a membrane separating central part 710 to which a membrane separating bolt 65 is fixed in the diaphragm 12 are respectively defined as a and b, the following relationship is satisfied: 0.15≤a/b≤0.375.SELECTED DRAWING: Figure 8B

Description

The present invention relates to a diaphragm valve.

Diaphragm valves are provided in piping lines in plants such as water treatment, chemicals, and foods, and the diaphragm valves control the fluid flowing through the piping (see, for example, Patent Document 1).

In the diaphragm valve shown in Patent Document 1, the diaphragm is held by a diaphragm bolt in the compressor. The diaphragm is formed by combining a rubber elastic body and a fluorine-based resin sheet arranged on the liquid contact surface side of the rubber elastic body.

Japanese Unexamined Patent Publication No. 10-288264

If the thickness of the fluorine-based resin sheet is increased in order to improve the long-term durability of the diaphragm valve, the fluorine-based resin sheet is less likely to be deformed. Therefore, rubber elasticity is provided so that force can be easily transmitted from the compressor to the fluorine-based resin sheet. It was necessary to reduce the thickness of the body.

However, if the thickness of the rubber elastic body of the sheet is made too thin, the force from the compressor to the fluororesin sheet may be dispersed, and the water stopping performance may be reduced.

An object of the present invention is to provide a diaphragm valve capable of achieving both water stopping performance and long-term durability in consideration of the above-mentioned conventional problems.

In order to achieve the above object, the diaphragm valve according to the first invention includes a valve body, a diaphragm, a drive mechanism, and a connecting member. A contact portion is provided in the flow path formed inside the valve body. The diaphragm is arranged on the valve body and closes the flow path by contacting the contact portion. The drive mechanism drives the diaphragm. The connecting member connects the diaphragm and the driving mechanism. The diaphragm has a first layer and a second layer. The first layer is arranged on the flow path side and contains a fluorine-based resin. The second layer is arranged on the opposite side of the flow path of the first layer and contains an elastic resin. Assuming that the thickness of the first layer in the peripheral edge portion of the diaphragm to which the connecting member is fixed is a and the thickness of the second layer is b, 0.15 ≦ a / b ≦ 0. Satisfy 375.

By setting the ratio of the thickness of the first layer containing the fluorine-based resin and the thickness of the second layer containing the elastic resin within the above range, the present inventors maintain a balance between water stopping performance and long-term durability performance and achieve both. I found that I could do it.

The diaphragm valve according to the second invention is the diaphragm valve according to the first invention, and the thickness a of the first layer is 1.8 mm or less.

As a result, the thickness of the first layer does not become too thick, and the water stopping performance can be ensured.
The diaphragm valve according to the third invention is the diaphragm valve according to the first invention, and a ridge portion protruding toward the contact portion is provided on the surface of the diaphragm on the flow path side. The thickness a of the first layer is the thickness of the peripheral portion other than the ridge portion.

As a result, it is possible to maintain a balance between water stopping performance and long-term durability performance.
The diaphragm valve according to the fourth invention is the diaphragm valve according to the first invention, and the connecting member is fixed to the first layer or the second layer in the fixed portion.

Thereby, the diaphragm can be driven by the driving mechanism. When the connecting member is fixed to the first layer, the connecting member penetrates the second layer and is inserted into the first layer. The second layer is driven together with the driving of the first layer. On the other hand, when the connecting member is fixed to the second layer, the first layer is adhered to the second layer, and the first layer is driven at the same time as the second layer is driven.

The diaphragm valve according to the fifth invention is the diaphragm valve according to any one of the first to fourth inventions, and the thickness of the fixed portion is larger than the thickness of the peripheral portion.
As a result, the durability of the fixed portion, which is the main deformation portion of the diaphragm, can be improved.

The diaphragm valve according to the sixth invention is the diaphragm valve according to the first, second, or fourth invention, and further includes a lid portion. The lid secures the diaphragm by sandwiching the outer peripheral edge of the diaphragm with the valve body. The diaphragm has an outer peripheral edge portion, a diaphragm portion inside the outer peripheral edge portion, and a ridge portion provided on a surface on the flow path side and projecting toward a contact portion. The valve body has a mounting portion on which the outer peripheral edge portion is mounted, and a shoulder portion on the main body side which is provided at both ends of the contact portion and connects the mounting portion and the contact portion. The ridge portion has a shoulder portion corresponding to the shoulder portion on the main body side and a main portion provided between the shoulder portions, and the shoulder portion is formed higher than the main portion.

In this way, the height of the shoulders at both ends of the ridge to stop water is higher than that of the main part, so the amount of compression of the elastic layer at the shoulders at both ends of the ridge in the closed state. Can be increased, the sealing property between the shoulders on the main body side at both ends of the contact portion and the shoulder portions at both ends of the ridge portion can be enhanced, and the flow path can be reliably blocked.

The diaphragm valve according to the seventh invention is the diaphragm valve according to the first, second, or fourth invention, and further includes a lid portion. The lid secures the diaphragm by sandwiching the outer peripheral edge of the diaphragm with the valve body. The diaphragm was provided in the circumferential direction on the valve body side of the outer peripheral edge portion, and was formed along the contact portion on the valve body side of the diaphragm and inside the peripheral edge convex portion on the peripheral convex portion in contact with the valve body. It has a ridge and a ridge. The ridge portion has an end portion provided at each of both ends and connected to a peripheral convex portion, and a central portion provided between the end portions. The end portion is formed so as to become wider from the central portion toward the peripheral convex portion.

When the diaphragm becomes concave and convex when opening and closing the flow path, this end becomes a bending point where a load is applied, but the width becomes wider from the center to the peripheral convex. By forming it, it is difficult for creases to form, and by extension, it is difficult for it to peel off or break, so that long-term durability is improved.

Further, by forming the end portion of the ridge portion so that the width becomes wider from the ridge portion toward the peripheral convex portion, the contact area at both ends of the ridge portion can be increased. As a result, the end portion of the ridge portion can come into contact with the valve body even when the diaphragm swings, and the surface pressure variation generated between the ridge portion and the valve body can be suppressed.

For this reason, it is not necessary to increase the axial load according to both ends of the ridge portion, the axial load required for water stoppage can be reduced, and the stress generated inside the diaphragm can be suppressed, so that long-term durability performance is improved. It becomes possible.

The diaphragm valve according to the eighth invention is the diaphragm valve according to the first, second, or fourth invention, and further includes a lid portion. The lid secures the diaphragm by sandwiching the outer peripheral edge of the diaphragm with the valve body. The diaphragm is provided in the circumferential direction on the valve body side of the outer peripheral edge portion, and has a peripheral convex portion that contacts the valve body. The peripheral edge convex portion has a first base end portion arranged on the outer peripheral edge portion side and a first tip portion arranged on the valve body side of the first base end portion. Assuming that the width of the first base end portion is La1 and the width of the first tip end portion is Lb1, La1> Lb1 is satisfied.

In this way, the first base end portion and the first tip end portion are provided on the peripheral convex portion, and the width La1 of the first base end portion and the width Lb1 of the first tip end portion satisfy La1> Lb1. The end portion can receive the compressive force from the lid portion, and the first tip portion can receive the force for stopping water. By making the width of the first base end portion larger than that of the first tip portion, the first base end portion is not significantly deformed by the internal pressure when an internal pressure is applied, so that the entire peripheral convex portion is not significantly deformed and water is stopped. Can be done. Further, by making the width of the first tip portion smaller than that of the first base end portion, the first tip portion is deformed by a weak force, so that the force required for stopping water can be weakened, and the valve body and lid can be weakened. The compressive force of the diaphragm by the part can be reduced.

As described above, it is possible to prevent the entire peripheral convex portion from being greatly deformed and reduce the compressive force required for stopping water, so that the stress generated in the diaphragm is reduced and the durability of repeated opening and closing is improved. Is possible.

The diaphragm valve according to the ninth invention is the diaphragm valve according to the eighth invention, and the diaphragm is provided on the inner side of the outer peripheral edge portion and on the contact portion side of the central portion. It has a ridge portion that can come into contact with the contact portion. The ridge portion has a second base end portion arranged on the outer peripheral edge portion side and a second tip portion arranged on the valve body side of the second base end portion. Assuming that the width of the second base end portion is La2 and the width of the second tip end portion is Lb2, La2> Lb2 is satisfied.

In this way, the second base end portion and the second tip end portion are provided in the ridge portion, and the width La2 of the second base end portion and the width Lb2 of the second tip portion satisfy La2> Lb2, thereby satisfying the second base unit. The end can receive the compressive force from the lid and compressor, and the second tip can receive the force to stop water. By making the width of the second base end portion larger than that of the second tip portion, the second base end portion is not significantly deformed by the internal pressure when an internal pressure is applied, so that the entire peripheral convex portion is not significantly deformed and water is stopped. Can be done. Further, by making the width of the second tip portion smaller than that of the second base end portion, the first tip portion is deformed by a weak force, so that the axial force required for stopping water can be weakened, and the compressor can be used. The compressive force can be reduced.

As described above, since the entire peripheral convex portion can be prevented from being greatly deformed and the compressive force can be reduced, the stress generated in the diaphragm is reduced, and the durability of repeated opening and closing can be improved.

The diaphragm valve according to the tenth invention is the diaphragm valve according to any one of the first to ninth inventions, and the contact portion is concavely curved toward the diaphragm side in a plane perpendicular to the flow direction of the flow path. The first main body side curved portion and the second main body side curved portion are included. The drive mechanism has a pressing portion. The pressing portion has a first pressing side curved portion and a second pressing side curved portion that are convexly curved toward the contact portion side in a plane perpendicular to the flow direction of the flow path. In a state where the diaphragm is pressed against the contact portion by the pressing portion, the first main body side curved portion faces the first pressing side curved portion, and the center of the curvature of the first main body side curved portion is the first pressing side curved portion. The center of the curvature of the second main body side coincides with the center of the curvature of the second main body side curved portion, and the center of the curvature of the second main body side curved portion coincides with the center of the curvature of the second pressing side curved portion. ..

The center of the curved portion formed on the pressing portion and the center of the curved portion formed on the abutting portion correspondingly coincide with each other in a state where the diaphragm is pressed against the abutting portion by the pressing portion. It is possible to suppress the occurrence of stress concentration points in the section.

Therefore, the force is successfully transmitted from the pressing portion to the diaphragm, and the water stopping performance can be improved.

According to the present invention, it is possible to provide a diaphragm valve capable of achieving both water stopping performance and long-term durability.

The perspective view of the diaphragm valve of 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. FIG. 3 is a cross-sectional view taken along the line between BB'in FIG. The figure which shows the relationship of the diaphragm, the compressor, the stem and the sleeve of FIG. A perspective view of the diaphragm unit of FIG. 1 as viewed from the diaphragm bolt side. A perspective view of the diaphragm unit of FIG. 1 as viewed from the opposite side of the diaphragm bolt. Bottom view of the diaphragm of FIG. FIG. 8A is a cross-sectional view taken along the line between FF'. FIG. 8B is a cross-sectional view of the second diaphragm member. FIG. 8B is a cross-sectional view of the first diaphragm member. FIG. 1 is a partial cross-sectional view including a ridge portion of the diaphragm of FIG. FIG. 1 is a cross-sectional view taken along the line between AA'in FIG. (A) A plan view showing the vicinity of the opening of the valve body of FIG. 3, and (b) a plan view showing a state in which the diaphragm is placed on the valve body of FIG. 9 (a). FIG. 2 is a perspective view of the diaphragm bolt of FIG. (A) A perspective view of the bonnet of FIG. 1 viewed from above, and (b) a perspective view of the bonnet of FIG. 11 (a) viewed from below. (A) Bottom view of the compressor of FIG. 5 as viewed from below, (b) Cross-sectional view taken along the line between CC'in FIG. 11 (a). (A) A schematic cross-sectional view showing a state in which the flow path is closed, and (b) a schematic cross-sectional view showing a state in which the flow path is open. The figure which showed the valve body and the compressor in the cross-sectional view of FIG. The figure which showed the valve body and the compressor in the cross-sectional view of FIG. The figure which shows the table of the result of the Example of the Embodiment which concerns on this invention. (A) A perspective view of the diaphragm of the second embodiment according to the present invention as viewed from the side opposite to the valve body, and (b) a perspective view of the diaphragm as viewed from the back side. Bottom view of the diaphragm of FIG. FIG. 19A is a cross-sectional view taken along the line between GG'. FIG. 19A is an enlarged view of part J. FIG. 19A is an enlarged view of part K. FIG. 19A is a cross-sectional view taken along the line between QQ'and a partially enlarged view of the end portion. FIG. 19A is an enlarged view of part L. The perspective view which shows the valve body of Embodiment 2 which concerns on this invention. (A) Cross-sectional view taken along the line between EE'in FIG. 20 and (b) enlarged view of part F in FIG. 21 (a). FIG. 5 is a cross-sectional view showing the vicinity of the peripheral edge of the diaphragm of the diaphragm valve of the second embodiment according to the present invention. (A) A perspective view of the diaphragm of the third embodiment according to the present invention viewed from the side opposite to the valve body, and (b) a perspective view of the diaphragm of the third embodiment according to the present invention viewed from the valve body side. Bottom view of the diaphragm of FIG. 23 (a). FIG. 24A is a cross-sectional view taken along the line between NN'in FIG. 24A. FIG. 24A is an enlarged view of part C. FIG. 24A is an enlarged view of part D. The cross-sectional view which shows the structure of the diaphragm unit in the modification of embodiment which concerns on this invention.

Hereinafter, the diaphragm valve according to the embodiment of the present invention will be described.
<1. Structure>
(1-1. Outline of diaphragm valve)
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 main body 11, a diaphragm unit 15, a bonnet 13 (an example of a lid), and a drive mechanism 14. Piping is connected to both ends of the valve body 11. A flow path 24 through which a fluid flows is formed in the valve body 11. The diaphragm 12 of the diaphragm unit 15 opens or shuts off the flow path 24. The bonnet 13 is attached to the valve body 11 so as to cover the diaphragm unit 15. A part of the drive mechanism 14 is arranged in the bonnet 13 and drives the diaphragm unit 15.

(1-2. 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 cross-sectional view taken along the line of the diaphragm valve 10 at the position between BB'in 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 and other resins, or metals such as iron, copper, copper alloys, brass, aluminum and 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.

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

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

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

(1-2-2. Central part 23)
As shown in FIG. 3, the central portion 23 is provided between the first end portion 21 and the second end portion 22. The central portion 23 includes a first surface 31, a second surface 32 (see FIG. 4), a wall portion 33 (see FIG. 4), a first rib 35, a second rib 36, and a plurality of bolt holes 37. Have.

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

As shown in FIGS. 3 and 4, the first rib 35 is formed so as to project from the first surface 31 along the outer circumference of the diaphragm 12. The first rib 35 is formed over the entire outer peripheral edge of the opening 31a. As shown in FIG. 3, the first rib 35 has a circular shape portion 351 and a protruding shape portion 352. The circular portion 351 is formed on the outside of the opening 31a along the edge 31ae of the opening 31a at a predetermined distance from the opening 31a. The protruding shape portion 352 projects outward from the circular shape portion 351 and is formed so as to trace a substantially quadrangular outer circumference. Inside the protruding shape portion 352, a protruding portion 125 of the diaphragm 12 shown in FIG. 6 to be described later is arranged.

As shown in FIG. 3, the first surface 31 has a mounting portion 311 on which the outer peripheral edge portion 121 (described later) of the diaphragm 12 is mounted between the first rib 35 and the opening 31a. The second rib 36 is formed so as to project from the mounting portion 311 along the edge of the opening 31a over the entire circumference. The height of the second rib 36 is formed to be lower than the height of the rib 35.

Four bolt holes 37 are formed around the opening 31a of the first surface 31 and outside the rib 35 in the Y direction, and the bolt holes 134 of the bonnet 13 described later (see FIG. 12B). The bonnet 13 is fixed to the valve body 11 by inserting the bolt 100 (see FIG. 1) so as to face the valve body 11.

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

As shown in FIG. 4, 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.

(1-2-3. Flow path 24)
As shown in FIG. 4, the flow path 24 is formed from the inlet 24a to the outlet 24b, and 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 provided in the middle of the flow path 24. Further, the opening 31a is formed at a position corresponding to the wall portion 33.

The diaphragm 12, which will be described later, is in pressure contact with the contact portion 33a, which is the tip of the wall portion 33 on the first surface 31 side. As shown in FIG. 9 described later, the abutting portion 33a is formed so as to be concavely curved toward the opening 31a in a plane perpendicular to the flow direction X.

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

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

The inner peripheral surface of the outlet side flow path 242 is formed to be curved, and as shown in FIG. 4, the width 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. 4) 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. 4 toward the first surface 31 side.

The second surface 32 is provided with a reinforcing rib 38 (see FIG. 4).
(1-3. Diaphragm unit 15)
FIG. 5 is a perspective view showing the diaphragm unit 15, the compressor 61, the sleeve 62, the stem 63, and the like, which will be described later. FIG. 5 shows the diaphragm unit 15, the compressor 61, the sleeve 62, and the central axis O of the stem 63. The central axis O is perpendicular to the first surface 31, and coincides with the driving directions of the diaphragm 12, the compressor 61, and the stem 63, which will be described later.

FIG. 6 is a perspective view of the diaphragm unit 15 as viewed from the diaphragm bolt 65 side. FIG. 7 is a perspective view of the diaphragm unit 15 as viewed from the opposite side of the diaphragm bolt 65. FIG. 8A is a bottom view of the diaphragm unit 15, and FIG. 8B is a cross-sectional view taken along the line between FFs of FIG. 8A.

The diaphragm unit 15 has a diaphragm 12 and a diaphragm bolt 65. The diaphragm 12 is driven by the drive mechanism 14 to open and close the flow path 24. The diaphragm bolt 65 is fixed to the diaphragm 12 and is connected to the drive mechanism 14.

(1-3-1. Diaphragm 12)
As shown in FIG. 2, the diaphragm 12 is arranged on the first surface 31 so as to close the opening 31a.

As shown in FIGS. 6 and 7, the diaphragm 12 has a diaphragm portion 120, an outer peripheral edge portion 121, a protruding portion 125, a rib 126, and a groove portion 127.

The diaphragm portion 120 is moved up and down by the drive mechanism 14. The diaphragm portion 120 has a circular shape and corresponds to the opening portion 31a of the valve body 11.

As shown in FIGS. 8A and 8B, a ridge portion formed so as to project toward the contact portion 33a of the wall portion 33 of the valve body 11 on the surface 120a of the diaphragm portion 120 on the contact portion 33a side. 122 is formed. The ridge portion 122 is formed along the second direction Y and is along the contact portion 33a. As shown in FIG. 8B, a convex portion 124 protruding toward the bonnet 13 side is formed in the central portion of the surface 120b opposite to the surface 120a of the diaphragm portion 120. A diaphragm bolt 65, which will be described later, is inserted into the convex portion 124.

The diaphragm portion 120 has a septal central portion 710 and a diaphragm peripheral portion 720. The central portion 710 of the diaphragm is a portion of the diaphragm portion 120 arranged in the center. A diaphragm bolt 65 is inserted and fixed to the central portion 710 of the diaphragm. The diaphragm peripheral portion 720 is provided on the peripheral edge of the diaphragm central portion 710. The central part of the diaphragm 710 is thicker than the peripheral part of the diaphragm 720. The diaphragm peripheral portion 720 has a partial spherical (spherical cap) shape. The diaphragm peripheral portion 720 is the main deformation portion of the diaphragm 12, and is curved in a convex state toward the contact portion 33a when the flow path 24 is closed, and is concave toward the contact portion 33a when the flow path 24 is opened. Curve to state.

FIG. 9 is a cross-sectional view taken along the line between AA'in FIG. The outer peripheral edge portion 121 has an annular shape and is formed on the outer periphery of the diaphragm peripheral portion 720 of the diaphragm portion 120, and is sandwiched between the bonnet 13 and the valve body 11 described later as shown in FIGS. 2 and 9. ..

As shown in FIGS. 6 and 7, the projecting portion 125 has a substantially rectangular parallelepiped shape, and is formed so as to project outward from the outer peripheral edge portion 121.

As shown in FIGS. 6 and 8B, the rib 126 is formed on the surface 121b of the outer peripheral edge portion 121 opposite to the abutting portion 33a along the circumferential direction, and is formed as shown in FIG. It fits into the groove 138 of the bonnet 13, which will be described later.

The groove portion 127 is formed on the surface 121a of the outer peripheral edge portion 121 on the contact portion 33a side along the circumferential direction, and as shown in FIG. 9, the groove portion 127 is formed on the second rib 36 of the valve body 11 described above. It has a shape along which the second rib 36 fits. The rib 126 and the groove 127 are formed at opposite positions. As shown in FIG. 9, the displacement of the diaphragm 12 is regulated by fitting the second rib 36 into the groove portion 127.

Further, by providing the rib 35, the flow to the outside of the diaphragm 12 is restricted even when the diaphragm 12 is compressed by the valve body 11 and the bonnet 13.

The height of the rib 35 is set lower than the film thickness of the diaphragm 12. As a result, the outer peripheral edge portion 121 of the diaphragm 12 can be compressed between the valve body 11 and the bonnet 13.

FIG. 10A is a plan view showing the first surface 31 of the valve body 11. FIG. 10B is a plan view showing a state in which the diaphragm unit 15 is mounted on the valve body 11. As shown in the figure, the diaphragm unit 15 is placed inside the rib 35 so that the groove portion 127 fits into the rib 36. The outer peripheral edge portion 121 of the diaphragm 12 is arranged on the mounting portion 311 inside the rib 35. Further, the diaphragm 12 is placed so that the protruding portion 125 is arranged inside the protruding portion 352 of the rib 35. As a result, the displacement of the diaphragm 12 in the circumferential direction is prevented, and the ridge portion 122 of the diaphragm 12 can be aligned with the position along the contact portion 33a.

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

Further, as shown in FIG. 8B, the diaphragm 12 is formed by the first diaphragm member 210 and the second diaphragm member 220. The first diaphragm member 210 forms the contact portion 33a side of the diaphragm 12. The second diaphragm member 220 forms the side opposite to the contact portion 33a of the diaphragm 12. It can be said that the first diaphragm member 210 is arranged on the surface of the second diaphragm member 220 opposite to the surface on which the diaphragm bolt 65 protrudes. A diaphragm bolt 65 is inserted into the first diaphragm member 210 through the second diaphragm member 220. A diaphragm bolt 65 projects from the second diaphragm member 220 toward the drive mechanism 14 side (opposite side to the contact portion 33a).

The material of the first diaphragm member 210 is a thermoplastic resin, and for example, a fluorine-based resin can be used. As the fluorine-based resin, for example, PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride) can be used.

The material of the second diaphragm member 220 may be any rubber-like elastic body, and is not particularly limited. Further, it is preferable that the material is different from that of the first diaphragm member 210. 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), etc. It is mentioned as a suitable material. Further, a high-strength reinforcing cloth may be inserted into the second diaphragm member 220, 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 fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed. When ethylene, propylene, or diene rubber is used, it has higher chemical resistance than other rubbers and is easier to vulcanize than EPM or the like, so that a high-strength diaphragm can be easily obtained.

By providing the first diaphragm member 210, improvement in chemical resistance can be expected as compared with the case where only the second diaphragm member 220, which is a rubber-like elastic body, is provided. Further, by providing the second diaphragm member 220, the force from the drive mechanism 14 of the diaphragm valve can be dispersed and transmitted to the first diaphragm member 210. Therefore, a higher compressive force (a force applied to the diaphragm 12'by the compressor 61 via the stem 63 by the rotation of the handle 64) is obtained and the water is stopped, which is lower than that in the case of only the first diaphragm member 210. Can be done. Further, by making the second diaphragm member 220 into rubber which is an elastic body, the axial force given from the stem 63 can be transmitted by stress dispersion to, for example, the first diaphragm member 210 which is a fluorine diaphragm, and the shaft is as small as possible. It is possible to obtain the force required to stop water efficiently with force. Further, when ethylene, propylene, or diene rubber is used as the second diaphragm member 220, it has higher chemical resistance than other rubbers and is easier to vulcanize than EPM, so that a high-strength diaphragm can be easily obtained. it can.

FIG. 8C is a cross-sectional view showing the second diaphragm member 220. FIG. 8D is a cross-sectional view showing the first diaphragm member 210.

As shown in FIGS. 8B and 8D, the first diaphragm member 210 includes a ridge portion 122, a first diaphragm portion 410 on the surface 120a side of the diaphragm portion 120, and a first outer peripheral edge portion on the surface 121a side of the outer peripheral edge portion 121. It forms 510 and a groove 127. Further, the first diaphragm portion 410 includes a first diaphragm central portion 411 forming a portion of the diaphragm central portion 710 on the surface 120a side and a first diaphragm peripheral portion 412 forming a portion of the diaphragm peripheral portion 720 on the surface 120a side. , Have.

FIG. 8E is a partial cross-sectional view including the ridge portion 122 of the diaphragm 12. The hatching is omitted for the sake of clarity.

As shown in FIG. 8E, the ridge portion 122 has shoulder portions 122s provided at both ends in the width direction, a main portion 122t provided between the shoulder portions 122s, and an extension portion 122u. ..

As shown in FIG. 9, the valve body 11 is provided with shoulder portions 312 at both ends of the contact portion 33a so as to connect the contact portion 33a to the mounting portion 311. The shoulder portion 122s of the ridge portion 122 is arranged so as to correspond to the shoulder portion 312. The extension portion 122u extends radially outward from the pair of shoulder portions 122s and reaches the groove portion 127.

The height H1 of the shoulder portion 122s is formed higher than the height H2 of the main portion 122t.

As shown in FIGS. 8B and 8C, the second diaphragm member 220 includes a second diaphragm portion 420 on the surface 120b side of the diaphragm portion 120 including the convex portion 124, and a second outer peripheral edge portion on the surface 121b side of the outer peripheral edge portion 121. It forms 520 and rib 126. The second diaphragm portion 420 includes a second diaphragm central portion 421 forming a portion of the diaphragm central portion 710 on the surface 120b side and a second diaphragm peripheral portion 422 forming a portion of the diaphragm peripheral portion 720 on the surface 120b side. Have.

The central portion 421 of the second diaphragm includes the convex portion 124, and the concave portion 228 is formed at a position corresponding to the convex portion 124 on the surface opposite to the surface 120b. Further, a convex portion 229 is formed at a position corresponding to the convex portion 124 on the surface opposite to the surface 120a of the first diaphragm central portion 411, and the convex portion 229 fits into the concave portion 228.

Further, the rib 226 is formed at a position corresponding to the rib 126 of the second diaphragm member 220 on the surface opposite to the surface 121a of the first diaphragm member 210. A groove 227 is formed on the surface of the second diaphragm member 220 on the opposite side of the surface 121b at a position corresponding to the groove 127 of the first diaphragm member 210. The rib 226 of the first diaphragm member 210 fits into the groove 227 of the second diaphragm member 220.

The first diaphragm member 210 and the second diaphragm member 220 are preferably adhesively processed, but may not be adhesively processed. This adhesive process can be performed using an adhesive (primer) or polymerization. Examples of the polymerization include sodium polymerization and plasma polymerization.

As described above, the diaphragm central portion 710 of the diaphragm portion 120 has a first diaphragm central portion 411 of the first diaphragm member 210 and a second diaphragm central portion 421 of the second diaphragm member 220. Further, the diaphragm peripheral portion 720 of the diaphragm portion 120 has a first diaphragm peripheral portion 412 of the first diaphragm member 210 and a second diaphragm peripheral portion 422 of the second diaphragm member 220.

Here, assuming that the thickness of the first diaphragm peripheral portion 412 of the first diaphragm member 210 is a and the thickness of the second diaphragm peripheral portion 422 of the second diaphragm member 220 is b, the following (Equation 1) can be satisfied. desirable.
(Equation 1) 0.15 ≤ a / b ≤ 0.375
The thickness a is the thickness of the portion other than the ridge portion 122 of the first diaphragm peripheral portion 412.

The thickness a of the first diaphragm peripheral portion 412 is preferably 2.0 mm or less, more preferably 1.8 mm or less.

(1-3-2. Septal bolt 65)
FIG. 11 is a perspective view showing the diaphragm bolt 65. The diaphragm bolt 65 is made of metal, for example, and connects the diaphragm 12 to the drive mechanism 14. One end of the diaphragm bolt 65 is embedded in the diaphragm 12, and the other end can be locked to the compressor 61.

The diaphragm bolt 65 has a columnar portion 71, an insertion portion 72, and a pair of locking pins 73.
The columnar portion 71 has a cylindrical shape and is arranged along the central axis O. Since the central axis O is along the driving direction of the diaphragm 12, the compressor 61 or the stem 63 (see FIGS. 14A and 14B described later), the columnar portion 71 is the diaphragm 12, the compressor 61 or the stem. It can be said that they are arranged along the driving direction of 63.

The columnar portion 71 has a first end 71a arranged on the diaphragm 12 side and a second end 71b arranged on the stem 63 side.

As shown in FIG. 8B, the insertion portion 72 is inserted into the convex portion 124 of the diaphragm 12 by insert molding. As shown in FIG. 11, the insertion portion 72 has a connection portion 91 and four protrusions 92a, 92b, 92c, and 92d. The connecting portion 91 is connected to the first end 71a of the columnar portion 71. The four projecting portions 92a, 92b, 92c, and 92d project from the connecting portion 91 in the direction perpendicular to the central axis O by the same length. In a plan view perpendicular to the central axis O, the four protrusions 92a, 92b, 92c, and 92d are provided at 90-degree intervals, and the insertion portions 72 are arranged in a cross shape. A pair of projecting portions 92a and a projecting portion 92c are arranged so as to sandwich the connecting portion 91 along a straight line La passing through the central axis O. Further, a pair of protruding portions 92b and a protruding portion 92d are arranged along a straight line Lb passing through the central axis O with the connecting portion 91 interposed therebetween.

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

The pair of locking pins 73 are provided on the second end 71b side of the columnar portion 71. The pair of locking pins 73 project from the side surface of the columnar portion 71 to the opposite sides of each other. A diaphragm bolt 65 is inserted into the through hole 616 from the second end 71b side thereof so that the pair of locking pins 73 pass through the pair of notch portions 616b (see FIG. 13A) of the compressor 61.

After that, the diaphragm bolt 65 is attached to the compressor 61 by rotating the diaphragm bolt 65 around the central axis O.

(1-4. 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.

FIG. 12A is a perspective view showing the appearance of the bonnet 13. FIG. 12B is a perspective view of the bonnet 13 as viewed from below. As shown in the figure, the bonnet 13 has a main body portion 131 and a fixing portion 132 fixed to the valve main body 11.

The main body 131 has a dome shape and, as shown in FIG. 12B, has an opening 13a having its widened end 131a as an edge. The opening 13a corresponds to the opening 31a of the first surface 31. Further, as shown in FIG. 12A, the main body portion 131 has a through hole 13b in the narrowed portion. The through hole 13b is formed so as to face the opening 13a, and the sleeve 62 and the stem 63, which will be described later, are arranged.

The fixing portion 132 is formed so as to project outward from the end 131a, and as shown in FIGS. 12B and 9, a plurality of bolt holes 134, an outer surface 135, and an inner side surface 136. It has a stepped surface 137 and a groove portion 138.

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

The outer side surface 135 is a surface of the fixing portion 132 on the valve body 11 side, and is a portion along the outer circumference. The inner side surface 136 is inside the outer surface 135 and is provided between the outer surface 135 and the opening 13a. The inner surface 136 is located on the through hole 13b side in the Z direction with respect to the outer surface 135, and a stepped surface 137 is formed between the inner surface 136 and the outer surface 135. The step surface 137 is formed substantially perpendicular to the outer surface 135. As shown in FIG. 9, the outer side surface 135 faces the first surface 31 and is arranged on the first surface 31. The rib 35 is located inside the stepped surface 137. The inner surface 136 faces the rib 35 and the mounting portion 311 as shown in FIG.

Since the stepped surface 137 is located outside the rib 35, the inner edge 135a of the outer surface 135 (which can be said to be the angle between the outer surface 135 and the stepped surface 137) is a circular portion as shown in FIG. 12B. It has 135b and a protruding shape portion 135c. The circular portion 135b is located outside the circular portion 351 (see FIG. 3) of the rib 35, and the protruding shape portion 135c is located outside the protruding shaped portion 352 (see FIG. 3) of the rib 35.

The groove portion 138 is formed on the inner side surface 136 along the opening 13a in the circumferential direction. As shown in FIG. 9, the rib 126 of the diaphragm 12 is fitted in the groove portion 138, and the movement of the diaphragm 12 is restricted.

(1-5. Drive mechanism 14)
As shown in FIG. 2, the drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, and a handle 64.

(1-5-1. Compressor 61)
The compressor 61 is formed of PVDF (polyvinylidene fluoride) or the like, and is connected to the diaphragm bolt 65 of the diaphragm unit 15. The diaphragm bolt 65 projects to the opposite side (non-contact surface side) of the valve body 11. The protruding portion of the diaphragm bolt 65 is engaged with the compressor 61, and the compressor 61 and the diaphragm 12 are connected to each other.

FIG. 13A is a bottom view of the compressor 61. FIG. 13B is a cross-sectional view taken along the line between CC'of the compressor 61.

As shown in FIG. 13A, the compressor 61 has a circular central portion 611 when viewed from the bottom surface, and a plurality of protruding portions 612a, 612b, 613a, 613b, 614a, which protrude outward from the central portion 611. It has 614b, 615a, and 615b.

As shown in FIG. 13B, the central portion 611 is provided with a hole portion 617, a recess 618, and a through hole 616. The hole portion 617 is a columnar space, and is formed with the central axis O as an axis.

A locking pin 73 of the diaphragm bolt 65 is arranged in the hole 617. Further, the tip portion 631 of the stem 63, which will be described later, is arranged in the hole portion 617.

Further, as shown in FIG. 13B, the recess 618 is formed in the center of the surface of the compressor 61 on the contact portion 33a side of the central portion 611. The recess 618 is a space having a substantially cylindrical shape when viewed from the bottom surface, and is formed with the central axis O as an axis. As shown in FIG. 9, the convex portion 124 of the diaphragm 12 is inserted into the concave portion 618.

As shown in FIG. 13B, the through hole 616 communicates the hole portion 617 with the recess 618. A diaphragm bolt 65 is inserted into the through hole 616. The through hole 616 is formed along the driving direction (central axis O direction) of the diaphragm 12.

As shown in FIG. 13A, the through hole 616 has a pair of notches having a circular hole portion 616a and a pair of notches 616b formed outward from the edge 616ae of the circular hole portion 616a. The portions 616b are formed so as to face each other so that the locking pin 73 of the diaphragm bolt 65 can be inserted.

In FIG. 13A, eight of the plurality of protrusions 612a, 612b, 613a, 613b, 614a, 614b, 615a, and 615b are formed, and are formed at an equal angle (about 45 degrees). Each faces in the radial direction. That is, a pair of protruding portions 612a and a protruding portion 612b are provided so as to sandwich the central portion 611 along a straight line passing through the central axis O of the circular hole portion 616a. Further, a pair of protruding portions 613a and a protruding portion 613b are provided so as to sandwich the central portion 611 along a straight line passing through the central axis O of the circular hole portion 616a. Further, a pair of projecting portions 614a and a projecting portion 614b are provided so as to sandwich the central portion 611 along a straight line passing through the central axis O of the circular hole portion 616a. Further, a pair of protruding portions 615a and a protruding portion 615b are provided so as to sandwich the central portion 611 along a straight line passing through the central axis O of the circular hole portion 616a.

The protruding portions 612a, 612b, 614a, and 614b project from the central portion 611 by the same length. The protruding portions 613a, 613b, 615a, and 615b project from the central portion 611 by the same length. The lengths of the protrusions 612a, 612b, 614a, and 614b are formed to be longer than the lengths of the protrusions 613a, 613b, 615a, and 615b.

As shown in FIG. 13B, the compressor 61 has a pressing surface 61a on the contact portion 33a side, and the pressing surface 61a is curved convexly with respect to the contact portion 33a in a plane perpendicular to the flow direction X. Is formed. The curved shape of the compressor 61 will be described in detail later.

(1-5-2. Sleeve 62, stem 63, handle 64)
As shown in FIG. 2, 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. As shown in FIG. 9, the tip 631 arranged inside the bonnet 13 of the stem 63 is fixed to the compressor 61. The tip portion 631 is arranged in the hole portion 617 of the compressor 61, and is fixed to the compressor 61 by a pin 101.

In this way, the stem 63 is fixed on the side opposite to the compressor 61 and the valve body 11.

As shown in FIG. 2, 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. 14 (a) and 14 (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. 14A, the sleeve 62 also rotates as the handle 64 rotates, and the stem 63 descends. .. As the stem 63 descends, the compressor 61 fixed to the end of the stem 63 also descends.

As the compressor 61 is lowered, the diaphragm 12 is convexly curved toward the second surface 32 side as shown in FIG. 14B, and is pressed against the contact portion 33a of the wall portion 33.

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 and the sleeve 62 rotate. As the stem 63 rises, the compressor 61 also rises, and the central portion of the diaphragm 12 engaged with the compressor 61 by the locking pin 73 of the diaphragm bolt 65 rises as shown in FIG. 14A.

As a result, the flow path 24 of the diaphragm valve 10 is opened.
<3. Contact area and compressor shape>
FIG. 15 is a cross-sectional view of FIG. 9 showing the valve body 11 and the compressor 61, showing a state in which the flow path 24 is open.

As shown in FIG. 15, the contact portion 33a has a first main body side curved portion 171 and a second main body side curved portion 172 having different centers in a plane perpendicular to the flow path 24. The first main body side curved portion 171 is formed on the left side of the center 170 of the contact portion 33a in FIG. 15, and the second main body side curved portion 172 is formed on the right side of the center 170 of the contact portion 33a. The first main body side curved portion 171 and the second main body side curved portion 172 are connected by a center 170.

The first main body side curved portion 171 is formed on the circumference, and the center thereof is shown as 171a. The center 171a is provided above the curved portion 171 on the first main body side (stem 63 side). First body-side curved portion 171 is shown in the range of the dotted line (the radius _{R 1)} passing through the center 171a.

The second main body side curved portion 172 is formed on the circumference, and the center thereof is shown as 172a. The center 172a is provided above the curved portion 172 on the second main body side (stem 63 side). The second main body side curved portion 172 is shown in the range of the dotted line (radius R ₁ ) passing through the center 172a. The first main body side curved portion 171 and the second main body side curved portion 172 are formed symmetrically with respect to the center 170, and the radius from the center 171a of the first main body side curved portion 171 and the second main body are formed. The radius of the side curved portion 172 from the center 172a is the same length.

In the present embodiment, the contact portion 33a is formed by curved portions formed on the two circumferences of the first main body side curved portion 171 and the second main body side curved portion 172.

On the other hand, the pressing surface 61a of the compressor 61 has a first pressing side curved portion 81 and a second pressing side curved portion 82 having different centers in a plane perpendicular to the flow path 24. The first pressing side curved portion 81 is formed on the left side of the through hole 616 in FIG. 15, and the second main body side curved portion 172 is formed on the right side of the insertion hole 613.

The first pressing side curved portion 81 is formed on the circumference, and the center thereof is shown as 81a. The center 81a is provided above the first pressing side curved portion 81 (stem 63 side). First pressing side curved portion 81 is indicated by range of point (radius _{r 1)} passing through the center 81a.

The second pressing side curved portion 82 is formed on the circumference, and the center thereof is shown as 82a. The center 82a is provided above the second pressing side curved portion 82 (stem 63 side). Second pressing side curved portion 82 is indicated by range of point (radius _{r 1)} passing through the center 82a. The first pressing side curved portion 81 and the second pressing side curved portion 82 are formed symmetrically with respect to the central axis of the through hole 616, and the radius of the first pressing side curved portion 81 from the center 81a. And the radius of the second pressing side curved portion 82 from the center 82a are the same length.

The first pressing side curved portion 81 is arranged so as to face the first main body side curved portion 171 and the second pressing side curved portion 82 is arranged so as to face the second main body side curved portion 172.

The radius R _{1 at the} contact portion 33a and the radius r _{1 at the} pressing surface 61a satisfy 0.2r ₁ <R ₁ <10r ₁ .

FIG. 16 is a diagram showing a state in which the compressor 61 is moved to the contact portion 33a side (see arrow Y1) by rotating the handle 64 from the state of FIG. 15, and the diaphragm 12 is pressed against the contact portion 33a. .. FIG. 16 shows only the valve body 11 and the compressor 61. A diaphragm 12 is arranged between the valve body 11 and the compressor 61.

As shown in FIG. 16, in a state where the diaphragm 12 is pressed against the contact portion 33a, the center 81a of the first pressing side curved portion 81 of the compressor 61 is the center of the first main body side curved portion 171 of the contact portion 33a. Consistent with 171a. Further, the center 82a of the second pressing side curved portion 82 of the compressor 61 coincides with the center 172a of the second main body side curved portion 172 of the contact portion 33a. It should be noted that the agreement in the present specification may be substantially the same, and includes mechanical errors.

In this way, in the state where the diaphragm 12 is pressed against the contact portion 33a, the first pressing side curved portion 81 and the first main body side curved portion 171 are formed concentrically with the second pressing side curved portion 82. The second main body side curved portion 172 is formed concentrically.

As described above, when the diaphragm 12 is pressed against the contact portion 33a by the compressor 61, the centers 171a and 172a coincide with the centers 81a and 82a, so that the stress concentration when the contact portion 33a is pressed by the compressor 61. It is possible to suppress the occurrence of locations. Therefore, the force is successfully transmitted from the compressor 61 to the diaphragm 12, and the water stopping performance can be improved.

<4. Example>
Next, the diaphragm valve 10 of the present embodiment will be described in more detail with reference to Examples.

Using PTFE for the first diaphragm member 210 and EPDM for the second diaphragm member 220, the thickness a of the first diaphragm peripheral portion 412 of the first diaphragm member 210 is 1.0 mm, 1.5 mm, 1.8 mm, and 2 Change to 0.0 mm and set a / b to 0.1, 0.125, 0.15, 0.175, 0.2, 0.3, 0.35, 0.375, and 0.4 for each thickness. Stress analysis and surface pressure analysis were performed on the diaphragm valve using the diaphragm changed to. CAE (Computer Aided Engineering) analysis was performed as the analysis, and QCDUP was used as the analysis tool.

FIG. 17 is a diagram showing a table of the results of the above experiment.
The stress analysis in FIG. 17 showed the generated stress in the diaphragm, and when it was 85 MPa or more, it was regarded as defective (x), and when it was less than 85 MPa, it was regarded as good (◯). Further, the surface pressure analysis of FIG. 17 shows the water stopping pressure generated on the contact surface between the valve body and the diaphragm when the valve is stopped, and when the analysis result is larger than 35 MPa, it is regarded as good (◯), and when it is 32 MPa or more and 35 MPa or less. It was regarded as normal (Δ), and when it was less than 32 MPa, it was regarded as defective (x). In addition, "normal" means that it is within the permissible range of use.

As shown in FIG. 17, when the value of a / b is 0.1, the stress in the diaphragm becomes large in all the thicknesses a of 1.0 mm to 2.0 mm, which is a defect. Further, when the value of a / b is 0.125, the stress in the diaphragm becomes large when the thickness a is 1.0 mm to 1.8 mm, which is a defect. It is considered that this is because the ratio of the thickness of PTFE to the thickness of EPDM is too small, and the driving force transmitted from EPDM to PTFE is difficult to disperse.

Further, when the value of a / b is 0.4, the surface pressure analysis result is low when the thickness a is 1.0 mm, 1.5 mm, 1.8 mm and 2.0 mm, which is a defect. It is considered that this is because the ratio of the thickness of PTFE to the thickness of EPDM is too large and the driving force transmitted from EPDM to PTFE is too dispersed.

Further, when the values of a / b are 0.35 and 0.375, the surface pressure analysis result when the thickness a is 2.0 mm is normal. It is considered that this is because the larger the thickness of PTFE, the harder it becomes, and therefore the water stop pressure becomes relatively low.

From the above, it is preferable to set the values of a / b to 0.15 or more and 0.375 or less. Further, the thickness of PTFE is preferably set to 1.0 mm or more and 2.0 mm or less, and more preferably 1.0 mm or more and 1.8 mm or less.

(Embodiment 2)
Next, the diaphragm valve of the second embodiment according to the present invention will be described.

The diaphragm valve 10 of the second embodiment is different in the shape of the diaphragm from the diaphragm valve 10 of the first embodiment, and the shape of the valve body and the shape of the bonnet are different according to the shape of the diaphragm. .. Therefore, the differences will be mainly described.

(Diaphragm 12')
Compared with the diaphragm 12 of the first embodiment, the diaphragm 12'of the present embodiment does not have the groove portion 127, the rib 226, and the groove portion 227 formed, and the peripheral rib 44 is formed on the surface 121a. Further, in the diaphragm 12'of the second embodiment, the rib 126 is not formed on the surface 121b, and the surface 121b is formed in a flat shape. Further, in the diaphragm 12'of the second embodiment, the shape of the ridge portion 122 which is the water blocking rib is different from that of the first embodiment.

FIG. 18A is a perspective view of the diaphragm 12'of the present embodiment as viewed from the front side (opposite side to the valve body 11). FIG. 18B is a perspective view of the diaphragm 12'as viewed from the back side (valve body 11 side). 19A is a bottom view of the diaphragm 12', and FIG. 19B is a cross-sectional view taken along the line between the GGs of FIG. 19A. FIG. 19C is an enlarged view of part J of FIG. 19A. FIG. 19D is an enlarged view of part K of FIG. 19A. FIG. 19E is a cross-sectional view taken along the line between QQ'of FIG. 19A and is a partially enlarged view of the end portion 47. FIG. 19F is an enlarged view of part L of FIG. 19A.

As shown in FIGS. 18 (a) and 18 (b), the diaphragm 12'has a diaphragm portion 120, an outer peripheral edge portion 121 (an example of an outer peripheral edge portion), and a protrusion portion 122'which is a water blocking rib. , A peripheral rib 44 (an example of a peripheral convex portion), and a protruding portion 125.

(Septum 120)
The diaphragm portion 120 is moved up and down by a drive mechanism 14 described later. The diaphragm portion 120 is a partial sphere having a circular shape when viewed from above, and corresponds to the opening portion 31a of the valve body 11.

As shown in FIGS. 19A and 19B, the surface 120a of the diaphragm portion 120 on the contact portion 33a side protrudes toward the contact portion 33a of the wall portion 33 of the valve body 11 and is a ridge portion 122 which is a protrusion. ´ is formed. As shown in FIGS. 18A and 19B, a convex portion 124, which is a thick portion protruding toward the bonnet 13 side, is formed in the central portion of the surface 120b opposite to the surface 120a of the diaphragm portion 120. ing. As shown in FIG. 18A, a diaphragm bolt 65, which will be described later, is inserted into the convex portion 124.

(Protrusion part 122')
As shown in FIG. 19A, the ridge portion 122'is formed at a position having the diameter of the circular diaphragm portion 120 along the second direction Y, and is formed along the contact portion 33a. The ridges 122'intersect the peripheral ribs 44 at both ends in the width direction (longitudinal direction).

In the present embodiment, the ridge portion 122'is formed so that the thickness of the root portion on the surface 120a side is the thickest and the thickness decreases toward the tip on the valve body 11 side.

The ridge portion 122'has an end portion 47 and a central portion 48, as shown in FIG. 19A. The end portions 47 are both end portions of the ridge portion 122'and are connected to the peripheral rib 44. The central portion 48 is provided between the end portions 47.

The width of the central portion 48 in the X direction is formed to be substantially constant. As shown in FIG. 19C, the central portion 48 has a side surface 48c, a side surface 48d, and a front end surface 48e. The side surface 48c is a side surface of the central portion 48 on the outlet 24b side. The side surface 48d is a side surface of the central portion 48 on the entrance 24a side. The side surface 48c and the side surface 48d are formed so as to project slightly toward the outside of the peripheral rib 44. Specifically, the side surface 48c is slightly curved so as to project toward the outlet 24b side. The side surface 48d is slightly curved so as to project toward the inlet 24a side. The side surface 48c and the side surface 48d may be linear rather than curved.

The tip surface 48e is provided so as to connect the end of the side surface 48c and the side surface 48d on the valve body 11 side. The tip surface 48e is preferably formed in an arc shape, but is not limited to a strict arc shape, and is preferably at least convexly curved toward the valve body 11. In the present embodiment, the tip surface 48e is arranged so that the center of the arc is opposed to the contact portion 33a and can be contacted.

The end portion 47 is provided so as to connect the central portion 48 and the peripheral rib 44. The end portions 47 are provided at both ends of the ridge portion 122', and connect the central portion 48 and the peripheral rib 44. The shape of the end portion 47 will be described in detail later.

(Outer peripheral edge portion 121, protruding portion 125)
The outer peripheral edge portion 121 has an annular shape, and is formed in a brim shape so as to extend in the horizontal direction on the outer periphery of the diaphragm portion 120. As shown in FIG. 2, the outer peripheral edge portion 121 is sandwiched between the bonnet 13 and the valve body 11.

As shown in FIGS. 19A and 19B, the projecting portion 125 has a substantially quadrangular shape, and is formed so as to project from the outer peripheral edge portion 121 toward the outside in the horizontal direction. The protruding direction is orthogonal to the extending direction (longitudinal direction) of the ridge portion 122'.

(Peripheral rib 44)
As shown in FIGS. 19A and 19B, the peripheral edge rib 44 is formed on the surface 121a of the outer peripheral edge portion 121 on the valve body 11 side along the circumferential direction, and is mounted as shown in FIG. 22. It comes into contact with the placement portion 311. The peripheral rib 44 projects toward the valve body 11 side.

As shown in FIG. 19B, the peripheral ribs 44 are provided on the inner side of the surface 121a at a predetermined distance from the outer peripheral end surface 121c of the outer peripheral edge portion 121. The surface 121a has a first surface portion 121a1 on the inner peripheral side of the peripheral rib 44 and a second surface portion 121a2 on the outer peripheral side of the peripheral rib 44.

In the present embodiment, the peripheral rib 44 is formed so that the thickness of the root portion on the surface 121a side is the thickest and the thickness becomes thinner toward the tip on the valve body 11 side.

The peripheral rib 44 is provided along the circumferential direction, and is formed so as to surround the ridge portion 122'. It can be said that the ridge portion 122'is formed inside the peripheral rib 44.

As shown in FIG. 19D, the peripheral rib 44 has a side surface 44c, a side surface 44d, and a tip surface 44e. The side surface 44c is a side surface on the inner peripheral side of the peripheral rib 44. The side surface 44d is a side surface on the outer peripheral side of the peripheral rib 44. The side surface 44c and the side surface 44d are formed so as to be slightly curved so as to project outward from the peripheral rib 44. Specifically, the side surface 44c is slightly curved so as to project toward the inner peripheral side. The side surface 44d is slightly curved so as to project toward the outer peripheral side. The side surface 44c and the side surface 44d may be linear rather than curved.

The front end surface 44e is formed so as to connect the side surface 44c and the side surface 44d. The tip surface 44e is curved so as to project toward the valve body 11. The tip surface 44e is preferably formed in an arc shape, but is not limited to a strict arc shape, and is preferably at least convexly curved toward the valve body 11.

The tip surface 44e is arranged so that the center of the arc can come into contact with the mounting portion 311 so as to face the mounting portion 311.

(End 47)
As shown in FIG. 19A, both end portions 47 at both ends of the ridge portion 122'have the same shape, so one of them will be described.

The end portion 47 is provided so as to project from the surface 120a and the surface 121a toward the valve body 11 direction. The end portion 47 is provided from the surface 120a to the surface 121a. The end portion 47 is formed so as to become wider from the central portion 48 toward the peripheral rib 44. When the diaphragm 12'is placed on the valve body 11, the end portion 47 is arranged through an interval 34a (see FIG. 20) described later.

As shown in FIGS. 19E and 19F, the end portion 47 has a side surface 47c on the outlet 24b side, a side surface 47d on the inlet 24a side, and a tip surface 47e connecting the side surface 47c and the side surface 47d. Note that FIG. 19E is an enlarged cross-sectional view of the end portion 47.

The side surface 47c is a side surface of the end portion 47 on the outlet 24b side. The side surface 47c is formed so as to rise from the surface 120a and the surface 121a toward the valve body 11 side. The side surface 47c connects the side surface 48c of the central portion 48 and the side surface 44c of the peripheral rib 44. The side surface 47c is formed so as to be convexly curved toward the inside of the end portion 47.

In FIG. 19F, the connection portion of the peripheral rib 44 of the side surface 47c with the side surface 44c is shown as 47c1, and the connection portion of the side surface 47c with the side surface 48c of the central portion 48 is shown as 47c2. The connecting portion 47c1 is an inflection point connecting the curved side surface 44c and the curved side surface 47c in a plan view. The connection portion 47c2 is a connection point between the straight side surface 48c and the curved side surface 47c in a plan view.

The side surface 47d is a side surface of the end portion 47 on the inlet 24a side. The side surface 47d is formed so as to rise from the surface 120a and the surface 121a toward the valve body 11 side. The side surface 47d connects the side surface 48d of the central portion 48 and the side surface 44c of the peripheral rib 44. The side surface 47d is formed so as to be curved toward the inside of the end portion 47 in a plan view.

In FIG. 19F, the connection portion of the peripheral rib 44 of the side surface 47d with the side surface 44c is shown as 47d1, and the connection portion of the side surface 47d with the side surface 48d of the central portion 48 is shown as 47d2. The connecting portion 47d1 is an inflection point connecting the curved side surface 44d and the curved side surface 47d in a plan view. The connecting portion 47d2 is a connection point between the straight side surface 48d and the curved side surface 47d in a plan view.

The tip surface 47e is provided so as to connect between the side surface 47c and the side surface 47d and between the tip surface 48e of the central portion 48 and the tip surface 44e of the peripheral rib 44.

As shown in FIG. 19F, assuming that the width of the connecting portion 47b of the end portion 47 with the central portion 48 is A and the width of the connecting portion 47a of the end portion 47 with the peripheral rib 44 is B, the B / A is 2. It is preferable to satisfy .1 ≦ B / A ≦ 4.2. The width is the largest thickness of the end portion 47 in the X direction at each connection portion, and is the root portion rising from the surfaces 120a and 121a of the end portion 47. Further, the width B of the connecting portion 47a corresponds to the distance between the connecting portion 47c1 and the connecting portion 47d1. Further, the width A of the connecting portion 47b corresponds to the distance between the connecting portion 47c2 and the connecting portion 47d2. The width A coincides with the width of the central portion 48.

(1st diaphragm member 210, 2nd diaphragm member 220)
As shown in FIGS. 19A and 19B, the diaphragm 12'has a first diaphragm member 210 (an example of the first layer) and a second diaphragm member 220 (an example of the second layer). A diaphragm bolt 65 (an example of a connecting portion) is inserted into the first diaphragm member 210. The diaphragm bolt 65 penetrates the second diaphragm member 220 from the first diaphragm member 210 and projects to the drive mechanism 14 side (opposite side to the contact portion 33a).

The first diaphragm member 210 forms the contact portion 33a side of the diaphragm 12', and forms a liquid contact surface. The second diaphragm member 220 forms the opposite side of the contact portion 33a of the diaphragm 12'.

As shown in FIG. 19B, the first diaphragm member 210 includes a ridge portion 122', a first diaphragm portion 410 on the surface 120a side of the diaphragm portion 120, and a first outer peripheral edge portion 510 on the surface 121a side of the outer peripheral edge portion 121. And peripheral ribs 44 are formed.

The second diaphragm member 220 forms a second diaphragm portion 420 on the surface 120b side of the diaphragm portion 120 including the convex portion 124, and a second outer peripheral edge portion 520 on the surface 121b side of the outer peripheral edge portion 121.

In the outer peripheral edge portion 121, the surface 121fb on the side opposite to the surface 121a of the first outer peripheral edge portion 510 of the first diaphragm member 210 is formed to be substantially flat. In the outer peripheral edge portion 121, the surface 121sa of the second outer peripheral edge portion 520 of the second diaphragm member 220 on the side of the first diaphragm member 210 is formed in a substantially flat surface. The surface 121fb and the surface 121sa are in flat contact with each other.

A convex portion 229 corresponding to the convex portion 124 is formed on the surface 120fb of the diaphragm portion 120 on the side opposite to the surface 120a of the first diaphragm portion 410 of the first diaphragm member 210. A diaphragm bolt 65 is inserted into the convex portion 229.

A recess 228 corresponding to the convex portion 229 is formed on the surface 120sa of the diaphragm portion 120 on the side opposite to the surface 120b of the second diaphragm portion 420 of the second diaphragm member 220.

(Valve body 11')
The valve body 11'of the second embodiment has the same configuration as the valve body of the first embodiment and the first rib 35, but the other rib configurations are different. In the present embodiment, the first rib 35 is referred to as a rib 35.

FIG. 20 is a perspective view showing the valve body 11'of the second embodiment. 21 (a) is a cross-sectional view taken along the line EE'of FIG. 20. 21 (b) is an enlarged view of the F portion of FIG. 21 (a). FIG. 22 is a cross-sectional view showing the vicinity of the outer peripheral edge portion 121 of the diaphragm 12 ′ of the diaphragm valve 10 of the second embodiment.

The central portion 23 of the valve body 11'of the second embodiment has an edge with the first surface 31, the second surface 32 (see FIG. 21 (a)), and the wall portion 33 (see FIG. 21 (a)). It has a rib 34, a rib 35, a rib 39, and a plurality of bolt holes 37.

The edge rib 34 has a quadrangular cross section as shown in FIGS. 20, 21 (a) and 21 (b), and projects upward (upward in the Z direction) from the first surface 31 along the edge of the opening 31a. Is formed. As shown in FIG. 20, the edge rib 34 has a first rib portion 341 and a second rib portion 342. The first rib portion 341 is formed in an arc shape along the edge of the opening 31a in a plan view. The second rib portion 342 is formed in an arc shape along the edge of the opening 31a in a plan view. A predetermined distance 34a is provided between both ends of the arc-shaped first rib portion 341 and both ends of the arc-shaped second rib portion 342. The distances 34a between the two are of equal length and are provided so as to face each other in the width direction Y. The end 47 of the water blocking rib 43 of the diaphragm 12'passes through the interval 34a when the diaphragm 12' is arranged on the valve body 11.

As shown in FIG. 22, the rib 35 is formed so as to project upward (upward in the Z direction) from the first surface 31 so as to follow the outer periphery of the diaphragm 12 with a slight gap. The rib 35 is formed over the entire edge of the opening 31a and has a substantially circular shape.

As shown in FIG. 21 (b), the rib 39 is formed along the rib 35 so as to project from the first surface 31 on the edge rib 34 side (which can be said to be the inside of the rib 35) of the rib 35. The rib 39 is integrally formed with the rib 35. In other words, the rib 39 includes a side surface that rises vertically (upward in the Z direction) from the first surface 31 and a horizontal upper surface that connects from the upper end thereof. The outer rib 35 includes an inner side surface that rises vertically from the upper surface of the inner rib 39, a horizontal upper surface connected from the upper end thereof, and an outer side surface that hangs vertically from the outer end of the upper surface. The rib 39 is formed lower than the rib 35. The rib 39 is formed in a stepped shape in the vicinity of the mounting portion 311 of the rib 35. Therefore, the rib 39 and the rib 35 have a stepped cross section with two steps.

As shown in FIG. 21B, the first surface 31 has a mounting portion 311 on which the outer peripheral edge portion 121 (described later) of the diaphragm 12 is mounted between the rib 39 and the edge rib 34.

(Arrangement of diaphragm 12'on valve body 11)
As shown in FIG. 22, the outer peripheral edge portion 121 is sandwiched between the valve body 11'and the bonnet 13', and the diaphragm 12 is held.

As shown in FIG. 22, when the diaphragm 12'is arranged on the valve body 11', the rib 39 is arranged so as to face the peripheral rib 44 of the diaphragm 12'in the radial direction. The rib 35 of the valve body 11'is arranged on the outside of the end surface 121c on the outer peripheral side of the outer peripheral edge portion 121. Further, the rib 39 of the valve body 11'is arranged so as to face the second surface portion 121a2 in the Z direction. The radial direction is perpendicular to the axis O and is a direction toward or away from the axis O.

As shown in FIG. 22, the tip surface 44e of the peripheral rib 44 is in contact with the mounting portion 311 of the valve body 11'. When the tip surface 44e curved in this way comes into contact with the mounting portion 311, it is possible to reduce the occurrence of stress concentration when the diaphragm 12'is oscillated.

When no internal pressure is applied, such as when not in use, the diaphragm 12'is in contact with the valve body 11'only on the tip surface 44e of the outer peripheral edge portion 121. The peripheral rib 44 has a gap between the rib 39 and the rib 35 and is not in contact with the rib 39.

Further, since only the tip portion of the peripheral rib 44 forming the tip surface 44e receives too much compressive force from the bonnet 13'that is applied when the valve body 11'and the bonnet 13' are sandwiched and fixed, the side surface 44c, Rigidity can be increased by providing a base end portion forming 44d.

The edge rib 34 is formed at a height that does not come into contact with the diaphragm 12'even when the diaphragm 12'moves up and down. Since the interval S is provided between the edge rib 34 and the diaphragm 12', the peripheral rib 44 faces the flow path 24 (it can be said that it is exposed). Therefore, when the internal pressure is generated in the diaphragm valve 10, the peripheral rib 44 is deformed so as to spread to the outer peripheral side due to the internal pressure, and comes into contact with the inner peripheral surface 39a of the rib 39 to stop water. Therefore, the inner peripheral surface 39a of the rib 39 is preferably flat in cross-sectional view.

(Bonnet 13')
As shown in FIG. 22, the bonnet 13'of the second embodiment is not provided with the groove portion 138 as compared with the bonnet 13 of the first embodiment. The outer peripheral edge portion 121 of the diaphragm 12'is arranged so that the surface 121b on the side opposite to the valve main body 11'contacts the inner side surface 136 in a plane. The rib 35 of the valve body 11'is arranged so as to face the inner side surface 136 in the Z direction. The rib 35 is located on the inner peripheral side of the stepped surface 137.

The outer peripheral edge portion 121 of the diaphragm 12'is sandwiched and compressed by the mounting portion 311 of the valve body 11'and the inner side surface 136 of the bonnet 13'.

(Embodiment 3)
Next, the diaphragm valve of the third embodiment according to the present invention will be described.

The diaphragm valve 10 of the third embodiment has a different shape of the rib of the diaphragm as compared with the diaphragm valve 10 of the second embodiment. Therefore, this difference will be mainly described.

FIG. 23A is a perspective view of the diaphragm 12 ″ of the present embodiment as viewed from the front side (opposite side to the valve body 11). FIG. 23B is a perspective view of the diaphragm 12 ″ as viewed from the back side (valve body 11 side). FIG. 24A is a bottom view of the diaphragm 12', and FIG. 24B is a cross-sectional view taken along the line between NNs of FIG. 24A. FIG. 24C is an enlarged view of part C of FIG. 24A. FIG. 24D is an enlarged view of part D of FIG. 24A.

The diaphragm 12 ″ of the third embodiment has a ridge portion 121 ″ and a peripheral rib 44 ″ having a shape different from that of the ridge portion 121 ″ and the peripheral rib 44 of the second embodiment.

(Peripheral rib 44')
As shown in FIG. 24C, the peripheral edge rib 44'is provided so as to project from the surface 121a of the outer peripheral edge portion 121 toward the valve body 11'. The peripheral rib 44'is formed substantially perpendicular to the surface 121a.

The peripheral rib 44'has a base end portion 51 (an example of a first base end portion) and a tip end portion 52 (an example of a first tip end portion). The base end portion 51 is provided on the outer peripheral edge portion 121 side. The base end portion 51 is formed so as to project from the surface 121a of the outer peripheral edge portion 121 toward the valve body 11'from the outer peripheral edge portion 121. The tip portion 52 is provided at the end of the base end portion 51 on the valve body 11'side, and is formed so as to project from the end of the base end portion 51 toward the valve body 11'. The tip portion 52 is in contact with the valve body 11'.

The base end portion 51 has a side surface 51c (an example of an arc portion) and a side surface 51d (an example of an arc portion). The side surface 51c is a side surface on the inner peripheral side of the base end portion 51. The side surface 51d is a side surface on the outer peripheral side of the base end portion 51. The side surfaces 51c and 51d of the base end portion 51 are formed so as to rise from the surface 121a toward the valve body 11'.

The side surface 51c and the side surface 51d are curved convexly toward the outside of the peripheral rib 44'. Specifically, the side surface 51c is curved convexly toward the inner peripheral side of the diaphragm 12, and the side surface 51d is curved convexly toward the outer peripheral side of the diaphragm 12. In the present embodiment, the side surface 51c and the side surface 51d are formed in an arc shape in a cross-sectional view. The side surface 51c and the side surface 51d have the same radius.

The tip portion 52 is provided at the center of the base end portion 51 in the width direction. In the present embodiment, the peripheral rib 44'is formed in line symmetry with respect to the line along the Z direction on the inner peripheral side and the outer peripheral side in the cross section perpendicular to the circumferential direction, but it does not have to be symmetrical.

The tip portion 52 has a tip surface 52e (an example of an arc portion). The tip surface 52e is convexly curved toward the outside of the peripheral rib 44'. Specifically, the tip surface 52e is curved convexly toward the valve body 11'side. The tip surface 52e is formed so as to connect the end of the side surface 51c and the side surface 51d on the valve body 11'side. In the present embodiment, the tip surface 52e is formed in an arc shape in a cross-sectional view. The tip surface 52e comes into contact with the mounting portion 311 of the valve body 11'. The tip surface 52e has a substantially semicircular shape in cross-sectional view. The tip surface 52e is arranged so that the substantially center of its semicircular outer shape is in contact with the mounting portion 311 of the valve body 11'.

Assuming that the width of the base end portion 51 is La1 and the width of the tip end portion 52 is Lb1, La1 and Lb1 satisfy La1> Lb1. The width La1 of the base end portion 51 corresponds to the maximum thickness in the radial direction. The width La1 is the thickness in the vicinity of the connection portion of the base end portion 51 with the outer peripheral edge portion 121. The width Lb1 of the tip portion 52 corresponds to the maximum thickness in the radial direction. The width Lb1 is the thickness of the tip portion 52 in the vicinity of the connection portion with the base end portion 51. Lb1 / La1 is preferably 0.2 or more and 0.35 or less.

Assuming that the height of the base end portion 51 is Ha1 and the height of the base end portion 51 and the tip portion 52 combined (the height of the entire peripheral rib 44') is Hb1, Hb1> Ha1 is set. Hb1 / Ha1 is preferably 1.2 or more and 1.45 or less.

Assuming that the radius of the side surfaces 51c and 51d is Ra1 and the radius of the front end surface 52e is Rb1, it is preferable that Ra1> Rb1 is set.

When no internal pressure is applied, such as when not in use, the diaphragm 12 is in contact with the valve body 11'only on the tip surface 52e of the outer peripheral edge portion 121. The peripheral rib 44'is not in contact with the rib 39 and the rib 35 with a gap.

Further, of the peripheral ribs 44', only the tip portion 52 forming the tip surface 52e receives too much compressive force from the bonnet 13'that is applied when the valve body 11'and the bonnet 13' are sandwiched and fixed. Rigidity can be increased by providing the base end portion 51 forming the 51c and 51d.

(Protrusion part 122')
In the present embodiment, the shape of the ridge portion 122 ″ is formed to be the same as that of the peripheral rib 44 ″.

As shown in FIG. 24D, the ridge portion 122 ″ is provided so as to project from the surface 120a of the diaphragm portion 120 toward the valve body 11 ″. The ridge portion 122 ″ is formed substantially perpendicular to the surface 120a. The ridge portion 122 ″ is provided substantially at the center of the diaphragm portion 120 in the X direction.

The ridge portion 122 ″ has a base end portion 271 (an example of a second base end portion) and a tip portion 272 (an example of a second tip end portion). The base end portion 271 is provided on the outer peripheral edge portion 121 side. The base end portion 271 is formed so as to project from the surface 120a of the diaphragm portion 120 toward the valve body 11'from the diaphragm portion 120. The tip portion 272 is provided at the end of the base end portion 271 on the valve body 11'side, and is formed so as to project from the end of the base end portion 271 toward the valve body 11'. The tip portion 272 can come into contact with the contact portion 33a of the valve body 11'.

The base end portion 271 has a side surface 271c and a side surface 271d. The side surface 271c is a side surface of the base end portion 271 on the outlet 24b side. The side surface 271d is a side surface of the base end portion 271 on the inlet 24a side. The side surfaces 271c and 71d of the base end portion 271 are formed so as to rise from the surface 120a toward the valve body 11'.

The side surface 271c and the side surface 271d are curved convexly toward the outside of the ridge portion 122 ″. Specifically, the side surface 271c is convexly curved toward the outlet 24b side of the flow path 24, and the side surface 271d is convexly curved toward the inlet 24a side of the flow path 24. In the present embodiment, the side surface 271c and the side surface 271d are formed in an arc shape in a cross-sectional view. The side surface 271c and the side surface 271d have the same radius.

The tip portion 272 is provided at the center of the base end portion 271 in the width direction. In the present embodiment, the ridge portion 122 ″ is formed so that the outlet 24b side and the inlet 24a side are line-symmetrical with respect to the line along the Z direction in the cross section perpendicular to the longitudinal direction (width direction). It does not have to be symmetrical.

The tip portion 272 has a tip surface 272e. The tip surface 272e is convexly curved toward the outside of the ridge portion 122 ″. Specifically, the tip surface 272e is curved convexly toward the valve body 11'side. The tip surface 272e is formed so as to connect the end of the side surface 271c and the side surface 271d on the valve body 11'side. In the present embodiment, the tip surface 272e is formed in an arc shape in a cross-sectional view. The tip surface 272e comes into contact with the contact portion 33a of the valve body 11'. The tip surface 272e has a substantially semicircular shape in cross-sectional view. The tip surface 272e is arranged so that the substantially center of its semicircular outer shape faces and contacts the contact portion 33a of the valve body 11'.

Assuming that the width of the base end portion 271 is La2 and the width of the tip end portion 272 is Lb2, La2 and Lb2 satisfy La2> Lb2. The width La2 of the base end portion 271 corresponds to the maximum thickness in the X direction. The width La2 is the thickness of the base end portion 271 in the vicinity of the connection portion with the diaphragm portion 120. The width Lb2 of the tip portion 272 corresponds to the maximum thickness in the X direction. The width Lb2 is the thickness of the tip portion 272 in the vicinity of the connection portion with the base end portion 271. Lb2 / La2 is preferably 0.2 or more and 0.35 or less.

Assuming that the height of the base end portion 271 is Ha2 and the height of the base end portion 271 and the tip portion 272 combined (the height of the entire ridge portion 122 ″) is Hb2, Hb2> Ha2 is set. Hb2 / Ha2 is preferably 1.2 or more and 1.45 or less.

Assuming that the radii of the side surfaces 271c and 271d are Ra2 and the radius of the front end surface 272e is Rb2, it is preferable that Ra2> Rb2 is set.

Further, since the tip portion 272 forming the tip surface 272e of the ridge portions 122 ″ receives excessive compression due to the axial force from the compressor 61, the base end portions 271 forming the side surfaces 271c and 271d are provided. Rigidity can be increased.

The peripheral rib 44 ′ and the ridge portion 122 ″ may have the same size or different sizes, and may match the shape of the valve body 11 ″.

<Features, etc.>
(1)
The diaphragm valves 10 of the first to third embodiments of the present embodiment include valve bodies 11, 11', diaphragms 12, 12', 12'(an example of a diaphragm), a drive mechanism 14, and a diaphragm bolt 65 (an example of a connecting member). ) And. A contact portion 33a is provided in the flow path 24 formed inside the valve bodies 11 and 11'. The diaphragms 12, 12'and 12'are arranged in the valve bodies 11 and 11'and close the flow path 24 by coming into contact with the contact portion 33a. The drive mechanism 14 drives the diaphragms 12, 12', 12'. The diaphragm bolt 65 connects the diaphragms 12, 12 ′, 12 ″ and the drive mechanism 14. The diaphragms 12, 12 ″, 12 ″ have a first diaphragm member 210 (an example of the first layer) and a second diaphragm member 220 (an example of the second layer). The first diaphragm member 210 is arranged on the flow path 24 side and contains a fluorine-based resin. The second diaphragm member 220 is arranged on the opposite side of the flow path 24 of the first diaphragm member 210 and contains an elastic resin. The thickness of the first diaphragm member 210 at the diaphragm peripheral portion 720 (example of the peripheral portion) provided on the peripheral edge of the diaphragm central portion 710 (an example of the fixed portion) to which the diaphragm bolt 65 is fixed in the diaphragm 12 is defined as a. Assuming that the thickness of the second diaphragm member 220 is b, 0.15 ≦ a / b ≦ 0.375 is satisfied.

In this way, by setting the ratio of the thickness of the first diaphragm member 210 containing the fluorine-based resin and the thickness of the second diaphragm member 220 containing the elastic resin within a predetermined range, the water-stopping performance and the long-term durability performance are balanced and compatible. The inventors of the present application have found that this can be achieved.

(2)
In the diaphragm valves 10 of the first to third embodiments of the present embodiment, the thickness a of the first diaphragm member 210 is 1.8 mm or less.

As a result, the thickness of the first layer does not become too thick, and the water stopping performance can be ensured.
(3)
In the diaphragm valves 10 of the first to third embodiments of the present embodiment, the protrusions 122, 122 ′, 122 protruding toward the abutting portion 33a are on the surfaces of the diaphragms 12, 12 ′, 12 ″ on the flow path 24 side. ´´ is provided. The thickness a of the first diaphragm member 210 is the thickness of the portion of the second diaphragm member 220 other than the ridge portion 122.

As a result, it is possible to maintain a balance between water stopping performance and long-term durability performance.
(4)
In the diaphragm valves 10 of the first to third embodiments of the present embodiment, the diaphragm bolt 65 is fixed to the first diaphragm member 210 or the second diaphragm member 220 at the central portion 710 of the diaphragm.

Thereby, the diaphragms 12, 12 ′, and 12 ″ can be driven by the drive mechanism 14. When the diaphragm bolt 65 is fixed to the first diaphragm member 210, the diaphragm bolt 65 is the second diaphragm member. It penetrates 220 and is inserted into the first diaphragm member 210, and drives the second diaphragm member 220 at the same time as driving the first diaphragm member 210. On the other hand, when the diaphragm bolt 65 is fixed to the second diaphragm member 220, the first diaphragm member 210 is adhered to the second diaphragm member 220, and the first diaphragm member 210 is also driven along with the driving of the second diaphragm member 220. Drive.

(5)
In the diaphragm valves 10 of the first to third embodiments, the thickness of the diaphragm central portion 710 (an example of the fixed portion) is larger than the thickness of the diaphragm peripheral portion 720 (an example of the peripheral portion).

Thereby, the durability of the diaphragms 12, 12 ″ and 12 ″ can be improved.

(6)
The diaphragm valves 10 of the first to third embodiments of the present embodiment further include bonnets 13 and 13'(an example of a lid portion). The bonnets 13 and 13 ″ fix the diaphragms 12, 12 ″ and 12 ″ by sandwiching the outer peripheral edge portion 121 of the diaphragms 12, 12 ″ and 12 ″ (an example of a diaphragm) with the valve bodies 11 and 11 ″. The diaphragms 12, 12', 12' are provided on the outer peripheral edge portion 121, the inner diaphragm portion 120 of the outer peripheral edge portion 121, and the surface on the flow path 24 side, and the protrusions projecting toward the contact portion 33a. It has parts 122, 122 ′, 122 ″ and. The valve body 11 is provided at both ends of the mounting portion 311 on which the outer peripheral edge portion 121 is mounted and the contact portion 33a, and the shoulder portion 312 (on the shoulder portion on the main body side) connecting the mounting portion 311 and the contact portion 33a. An example) and. The ridges 122, 122 ′, 122 ″ have a shoulder portion 122s corresponding to the shoulder portion 312 and a main portion 122t provided between the shoulder portions 122s, and the shoulder portion 122s has a main portion 122t. Is formed higher than.

In this way, the heights of the shoulder portions 122s at both ends of the ridge portions 122, 122 ′, 122 ″ for stopping water are made higher than the main portion 122t, so that the ridge portions 122 in the closed state, The amount of compression of the elastic layer at the shoulder portions 122s at both ends of 122 ″ and 122 ″ can be increased, and the shoulder portions 312 at both ends of the contact portion 33a and both ends of the ridge portions 122, 122 ″ and 122 ″ can be increased. The sealability between the shoulder portion 122s and the shoulder portion 122s can be enhanced, and the flow path 24 can be reliably blocked.

(7)
The diaphragm valves 10 of the second and third embodiments further include a bonnet 13 (an example of a lid). The bonnet 13 ″ fixes the diaphragms 12 ″ and 12 ″ by sandwiching the outer peripheral edge portion 121 of the diaphragms 12 ″ and 12 ″ (an example of a diaphragm) with the valve body 11 ′. The diaphragms 12'and 12' are provided in the circumferential direction on the valve body 11'side of the outer peripheral edge portion 121, and the peripheral edge ribs 44, 44'(an example of the peripheral convex portion) that come into contact with the valve body 11'and the diaphragm 12' It has ridges 122 ′ and 122 ″ on the valve body 11 ′ side of ′, 12 ″ and formed inside the peripheral ribs 44 and 44 ′ along the contact portion 33a. The ridge portions 122 ′ and 122 ″ have an end portion 47 provided at each of both ends and connected to the peripheral ribs 44 and 44 ′, and a central portion 48 provided between the end portions 47. The end portion 47 is formed so as to become wider from the central portion 48 toward the peripheral ribs 44, 44'.

When the diaphragms 12 ′ and 12 ″ are in a concave state and a convex state when opening and closing the flow path 24, this end portion 47 becomes a bending point to which a load is applied, but the end portion 47 is moved from the central portion 48 to the peripheral rib. By forming the width so as to increase toward 44 and 44', creases are less likely to occur, and peeling and breaking are less likely to occur, so that long-term durability is improved.

Further, by forming the end portions of the ridge portions 122 ″ and 122 ″ so that the width becomes wider from the ridge portions 122 ′ and 122 ″ toward the peripheral ribs 44 and 44 ″, the ridge portions 122 ″ are formed. , 122 ″ can increase the contact area at both ends. As a result, the ends of the ridges 122 ′ and 122 ″ can come into contact with the valve body 11 ′ even when the diaphragm is swung, and the ridge portions 122 ′ and 122 ″ and the valve body 11 ′ It is possible to suppress the variation in surface pressure that occurs between them.

Therefore, it is not necessary to increase the axial load according to both ends of the ridge portions 122 ′ and 122 ″, the axial load required for water stoppage can be reduced, and the stress generated inside the diaphragm can be suppressed. It is possible to improve long-term durability performance.

(8)
The diaphragm valve 10 of the third embodiment further includes a bonnet 13'(an example of a lid). The bonnet 13 ″ fixes the diaphragm 12 ″ by sandwiching the outer peripheral edge portion 121 of the diaphragm 12 ″ (an example of a diaphragm) with the valve body 11 ″. The diaphragm 12 ″ is provided in the circumferential direction on the valve body 11 ′ side of the outer peripheral edge portion 121, and has a peripheral edge rib 44 ″ (an example of a peripheral convex portion) that contacts the valve body 11 ″. The peripheral edge rib 44'has a base end portion 51 (an example of a first base end portion) arranged on the outer peripheral edge portion 121 side and a tip end portion 52 (first) arranged on the valve body 11'side of the base end portion 51. An example of the tip portion) and. Assuming that the width of the base end portion 51 is La1 and the width of the tip end portion 52 is Lb1, La1> Lb1 is satisfied.

In this way, the peripheral rib 44'is provided with the base end portion 51 and the tip end portion 52, and the width La1 of the base end portion 51 and the width Lb1 of the tip end portion 52 satisfy La1> Lb1, so that the bonnet is formed by the base end portion 51. It receives the compressive force from 13'and can receive the force to stop water by the tip 52. By making the width of the base end portion 51 larger than that of the tip end portion 52, the base end portion 51 is not significantly deformed by the internal pressure when an internal pressure is applied, so that the entire peripheral edge rib 44'can be stopped without being significantly deformed. .. Further, by making the tip portion 52 smaller in width than the base end portion 51, the tip portion 52 is deformed by a weak force, so that the force required for stopping water can be weakened, and the valve body 11'and the bonnet 13 can be weakened. The compressive force of the diaphragm 12 ″ due to ′ can be reduced.

As described above, since the entire peripheral rib 44'can be prevented from being significantly deformed and the compressive force required for stopping water can be reduced, the stress generated in the diaphragm 12'is reduced, and the durability of repeated opening and closing is reduced. Can be improved.

(9)
In the diaphragm valve 10 of the third embodiment, the diaphragm 12 ″ (an example of a diaphragm) is a contact portion between the diaphragm portion 120 (an example of the central portion) provided inside the outer peripheral edge portion 121 and the diaphragm portion 120. It has a ridge portion 122 ″ which is provided on the 33a side and is capable of contacting the contact portion 33a. The ridge portion 122 ″ includes a base end portion 271 (an example of a second base end portion) arranged on the outer peripheral edge portion 121 side and a tip portion 272 (an example) arranged on the valve body 11 ′ side of the base end portion 271. An example of a second tip portion) and. Assuming that the width of the base end portion 271 is La2 and the width of the tip end portion 272 is Lb2, La2> Lb2 is satisfied.

In this way, the base end portion 271 and the tip end portion 272 are provided on the ridge portion 122 ″, and the width La2 of the base end portion 271 and the width Lb2 of the tip end portion 272 satisfy La2> Lb2, whereby the base end portion 271 It receives the compressive force from the bonnet 13'and the compressor 61, and can receive the force to stop the water by the tip portion 272. By making the width of the base end portion 271 larger than that of the tip portion 272, the base end portion 271 is not significantly deformed by the internal pressure when an internal pressure is applied, so that the entire peripheral edge rib 44'can be stopped without being significantly deformed. .. Further, by making the tip portion 272 smaller than the base end portion 271, the tip portion 272 is deformed with a weak force, so that the axial force required for stopping water can be weakened, and the compressive force from the compressor can be reduced. It can be made smaller.

As described above, since the entire peripheral rib 44 can be prevented from being significantly deformed and the compressive force can be reduced, the stress generated in the diaphragm 12 ″ is reduced, and the durability of repeated opening and closing can be improved. It becomes.

(10)
In the diaphragm valves 10 of the first to third embodiments, the contact portion 33a is a first main body that is concavely curved toward the diaphragms 12, 12 ′, 12 ″ in a plane perpendicular to the flow direction of the flow path 24. The side curved portion 171 and the second main body side curved portion 172 are included. The drive mechanism 14 has a compressor 61 (an example of a pressing portion). The compressor 61 has a first pressing side curved portion 81 and a second pressing side curved portion 82 that are convexly curved toward the contact portion 33a in a plane perpendicular to the flow direction of the flow path 24. In a state where the diaphragms 12, 12 ′, 12 ″ (an example of a diaphragm) are pressed against the contact portion 33a by the compressor 61, the first main body side bending portion 171 faces the first pressing side bending portion 81, and the first The bending center 171a of the main body side bending portion 171 coincides with the bending center 81a of the first pressing side bending portion 81, the second main body side bending portion 172 faces the second pressing side bending portion 82, and the second main body The bending center 172a of the side bending portion 172 coincides with the bending center 82a of the second pressing side bending portion 82.

The center of the curved portion formed in the compressor 61 and the center of the curved portion formed in the abutting portion 33a corresponding to the center are pressed by the compressor 61 against the diaphragms 12, 12 ′, 12 ″ against the abutting portion 33a. By matching in the above state, it is possible to suppress the occurrence of stress concentration points in the contact portion 33a.

Therefore, the force is successfully transmitted from the compressor 61 to the diaphragms 12, 12'and 12', and the water stopping performance can be improved.

[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)
Further, in the above embodiment, the diaphragm bolt 65 is fixed to the first diaphragm member 210, but may be fixed to the second diaphragm member 220. Such a diaphragm unit 15'is shown in the cross-sectional configuration diagram of FIG. 25. The diaphragm 1012 of the diaphragm unit 15'is formed by a first diaphragm member 210'and a second diaphragm member 220'. The first diaphragm member 210'is not provided with the convex portion 229 as compared with the first diaphragm member 210 of the above embodiment, and is recessed in the surface on the second diaphragm member 220 side corresponding to the ridge portion 122. 230'is provided. Further, the second diaphragm member 220'is not provided with the recess 228 as compared with the second diaphragm member 220 of the above embodiment, and the ridge portion 231'that fits into the recess 230'is formed. The diaphragm bolt 65'may have the same configuration as the diaphragm bolt 65 of the above embodiment, but may be formed in a tapered shape so that the diameter of the end of the columnar portion 71 becomes smaller toward the insertion portion 72.

In this case, the first diaphragm member 210'is fixed to the surface of the second diaphragm member 220'by adhesive processing. Examples of the bonding process include bonding using a primer or polymerization (sodium polymerization, plasma polymerization).

(B)
In the above embodiment, the outer peripheral edge portion 121 of the diaphragm 12 has a circular outer circumference, but the outer peripheral edge portion 121 is not limited to this, and may be a quadrangular shape.

Further, in the above embodiment, the protruding portion 125 of the diaphragm 12 has a quadrangular shape, but the present invention is not limited to this, and in short, it is sufficient that the positional deviation of the diaphragm 12 in the rotation direction can be regulated.

(C)
Although the diaphragm bolt 65 is locked to the compressor 61 by the locking pin 73, the diaphragm bolt 65 is not limited to the locking pin 73, and may be, for example, a nut. In the case of a nut, the nut may be fastened to the columnar portion 71 from the recess 618 side after being penetrated through the through hole 616 of the compressor 61.

(D)
In the diaphragm valve 10 of the above embodiment, the sleeve 62 and the manual handle 64 are provided as an example of the drive unit for driving the stem 63, but the stem 63 is driven by the pneumatically driven or electrically driven drive unit. May be done.

The diaphragm valve of the present invention exerts an effect capable of achieving both water stopping performance and long-term durability, and can be used in plants and the like.

10: Diaphragm valve 12: Diaphragm 14: Drive mechanism 15: Diaphragm unit 24: Flow path 65: Septal bolt 210: 1st diaphragm member 220: 2nd diaphragm member 710: Central diaphragm 720: Peripheral diaphragm

Claims (10)

A valve body with a contact portion in the flow path formed inside,
A diaphragm that is placed on the valve body and closes the flow path by contacting the contact portion.
The drive mechanism that drives the diaphragm and
A connecting member for connecting the diaphragm and the driving mechanism is provided.
The diaphragm has a first layer arranged on the flow path side and containing a fluororesin, and a second layer of the first layer arranged on the side opposite to the flow path and containing an elastic resin.
If the thickness of the first layer is a and the thickness of the second layer is b in the peripheral edge portion of the diaphragm provided on the peripheral edge of the fixed portion to which the connecting member is fixed, 0.15 ≦ a /. satisfy b ≤ 0.375,
Diaphragm valve. The thickness a of the first layer is 1.8 mm or less.
The diaphragm valve according to claim 1. A ridge portion protruding toward the abutting portion is provided on the surface of the diaphragm on the flow path side.
The thickness a of the first layer is the thickness of the peripheral portion other than the ridge portion.
The diaphragm valve according to claim 1. The connecting member is fixed to the first layer or the second layer in the fixed portion.
The diaphragm valve according to claim 1. The thickness of the fixed portion is larger than the thickness of the peripheral portion.
The diaphragm valve according to any one of claims 1 to 4. A lid portion for fixing the diaphragm by sandwiching the outer peripheral edge portion of the diaphragm with the valve body is further provided.
The diaphragm has the outer peripheral edge portion, the inner diaphragm portion of the outer peripheral edge portion, and the ridge portion provided on the surface on the flow path side and projecting toward the contact portion.
The valve body has a mounting portion on which the outer peripheral edge portion is mounted, and a main body side shoulder portion provided at both ends of the contact portion and connecting the previously described mounting portion and the contact portion.
The ridge portion has a shoulder portion corresponding to the main body side shoulder portion and a main portion provided between the shoulder portions, and the shoulder portion is formed higher than the main portion. ,
The diaphragm valve according to any one of claims 1, 2, and 4. A lid portion for fixing the diaphragm by sandwiching the outer peripheral edge portion of the diaphragm with the valve body is further provided.
The diaphragm is
A peripheral convex portion provided on the valve body side of the outer peripheral edge portion in the circumferential direction and in contact with the valve body, and a peripheral convex portion.
It has a ridge portion formed along the abutting portion on the valve body side of the diaphragm and inside the peripheral convex portion.
The ridge portion has an end portion provided at each of both ends and connected to the peripheral convex portion, and a central portion provided between the end portions.
The end portion is formed so as to become wider from the central portion toward the peripheral convex portion.
The diaphragm valve according to any one of claims 1, 2, and 4. A lid portion for fixing the diaphragm by sandwiching the outer peripheral edge portion of the diaphragm with the valve body is further provided.
The diaphragm is
The outer peripheral edge portion is provided in the circumferential direction on the valve body side, and has a peripheral convex portion that contacts the valve body.
The peripheral edge convex portion has a first base end portion arranged on the outer peripheral edge portion side and a first tip end portion arranged on the valve body side of the first base end portion.
Assuming that the width of the first base end portion is La1 and the width of the first tip end portion is Lb1, La1> Lb1 is satisfied.
The diaphragm valve according to any one of claims 1, 2, and 4. The diaphragm has a central portion provided inside the outer peripheral edge portion, and a ridge portion provided on the contact portion side of the central portion and capable of contacting the contact portion.
The ridge is
It has a second base end portion arranged on the outer peripheral edge portion side and a second tip portion arranged on the valve body side of the second base end portion.
Assuming that the width of the second base end portion is La2 and the width of the second tip end portion is Lb2, La2> Lb2 is satisfied.
The diaphragm valve according to claim 8. The contact portion includes a first main body side curved portion and a second main body side curved portion that are concavely curved toward the diaphragm side in a plane perpendicular to the flow direction of the flow path.
The drive mechanism
It has a first pressing side curved portion and a second pressing side curved portion that are convexly curved toward the contact portion side in a plane perpendicular to the flow direction of the flow path, and presses the diaphragm against the contact portion. Has a pressing part,
In a state where the diaphragm is pressed against the contact portion by the pressing portion, the first main body side curved portion faces the first pressing side curved portion, and the center of the curvature of the first main body side curved portion is. The center of the curvature of the first pressing side bending portion coincides with the bending center of the second main body side bending portion, the second main body side bending portion faces the second pressing side bending portion, and the bending center of the second main body side bending portion is the second main body side bending portion. Consistent with the center of curvature of the pressing side curvature,
The diaphragm valve according to any one of claims 1 to 9.

Images