JP5931522B2 - Diaphragm valve - Google Patents

Description

  The present invention relates to a diaphragm valve used for various liquid pipes in the food industry, the pharmaceutical industry, and the like, and more particularly to a diaphragm valve that opens and closes a flow path between a first port and a second port.

  As a conventional diaphragm valve, for example, the one described in Patent Document 1 is known. The diaphragm valve described in Patent Document 1 has an inlet channel and an outlet channel, and has a seating surface in the middle of these channels. And when closing these flow paths, a valve body is press-contacted to the seating surface, and when opening, the said valve body is spaced apart from a seating surface.

JP 2003-120856 A

  However, the diaphragm valve as described above moves the valve body in the same direction as the flow path direction from the inlet flow path to the outlet flow path when the outlet flow path is closed. There was a problem that the movement speed of the body was accelerated and a water hammer was generated. Therefore, there has been a problem that the membrane portion on the diaphragm side, the valve body and the like are easily damaged.

  In view of the above problems, an object of the present invention is to provide a diaphragm valve capable of preventing a water hammer generated when a flow path is closed.

  Means for solving the above-described problems can be achieved by the following means. In addition, although the code | symbol in a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

The diaphragm valve according to claim 1 is orthogonal to the axial direction of the main body pipe part (2, 51) on the main body pipe part (2, 51) and the side wall part (20a) of the main body pipe part (2, 51). The first port (P1, P10a, P10b) projecting in the direction and one end of the main body pipe part (2, 51) are orthogonal to the axial direction or the axial direction of the main body pipe part (2, 51). 2nd port (P2, P11) provided in the direction and the metal operation which is arranged in the main body pipe part (2, 51) and is connected to the driving means (3) and reciprocates in the axial direction. A shaft (4) and a flow path (A, C) provided on one end side of the operating shaft (4) and extending from the first port (P1, P10a, P10b) to the second port (P2, P11) ) and valve body (5) made of openable metal, provided at the other end side of the actuating shaft (4), and, the main tube portion ( , And a diaphragm (6) which always closes the other end portion 51), the metal actuating shaft (4), a metal valve body (5) and the diaphragm (manufactured wetted part of each of 6) Resin The coating portion (10a) on the operating shaft (4) side, the coating portion (10b) on the valve body (5) side, and the coating portion (10c) on the diaphragm (6) side are formed. The valve body (5) is integrally formed, and when the flow path (A, C) is closed, the operating shaft is located at a position where the flow path (A, C) can be closed from the direction opposite to the flow path direction. It is characterized by being connected to (4) .

The diaphragm valve according to a second aspect is the diaphragm valve according to the first aspect , wherein the outer peripheral edge of the one end portion of the main body pipe portion (2) is configured to have a liquid storage tank (T) capable of storing various liquids and the first tank. It is attached to the bottom of the liquid storage tank (T) so that the two ports (P2) communicate with each other, and the valve body (5) can close the flow path (A) from the direction opposite to the flow path direction. Further, it is arranged in the liquid storage tank (T).

  Next, effects of the present invention will be described with reference numerals in the drawings. In addition, although the code | symbol in a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

  First, according to the invention of claim 1, when closing the flow path (A, C), the valve body (5) can be moved in the direction opposite to the flow path direction of the flow path (A, C). Since the valve body (5) is arranged at the position, the moving speed of the valve body (5) is not accelerated by the flow paths (A, C). Therefore, it is possible to prevent water hammer generated when closing the flow paths (A, C).

Moreover, according to invention of Claim 1 , each liquid-contact part of an operating shaft (4), a valve body (5), and a diaphragm (6) is formed with the resin-made membrane | film | coat (10), The said membrane | film | coat (10) Is an integral molded article composed of the coating portion (10a) on the operating shaft (4) side, the coating portion (10b) on the valve body (5) side, and the coating portion (10c) on the diaphragm (6) side. There will be no liquid residue or accumulation.

Furthermore, according to the invention of claim 2, since the valve body (5) as described above is provided in the liquid storage tank (T), the retention due to the pool occurs at the bottom of the liquid storage tank (T). The liquid stored in the liquid storage tank (T) can be uniformly stirred.

  Furthermore, since the liquid storage tank (T) and the second port (P2) communicate with each other, the outer peripheral edge of the one end portion of the main body pipe portion (2) is attached to the bottom of the liquid storage tank (T). In attaching to the bottom of the liquid storage tank (T), no attachment is provided on the coating (10). Therefore, it is possible to prevent contamination caused by providing the mounting portion.

FIG. 2 is a partial cross-sectional front view showing the diaphragm valve according to the first embodiment of the present invention and showing a state in which a liquid channel flowing through the liquid storage tank is opened. It is a partial cross section front view which shows the state which closed the liquid flow path which shows the diaphragm valve which concerns on the same embodiment, and flows into a liquid storage tank. It is a partial cross section front view which shows the state which opened the liquid flow path which flows into the 2nd port of the diaphragm valve while showing the diaphragm valve which concerns on 2nd Embodiment of this invention. It is a partial cross section front view which shows the state which closed the liquid flow path which flows into the 2nd port of the diaphragm valve while showing the diaphragm valve which concerns on the same embodiment.

<First Embodiment>
Hereinafter, a first embodiment of a diaphragm valve according to the present invention will be described in detail with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the diaphragm valve 1 according to this embodiment is attached to a liquid storage tank T that can store various liquids in the food industry, the pharmaceutical industry, and the like with the bottom open. is there.

  More specifically, as shown in FIGS. 1 and 2, the diaphragm valve 1 includes a main body pipe portion 2, and the main body pipe portion 2 includes a first main body pipe portion 20 and a second main body pipe portion 21. It consists of In one direction of the side wall portion 20a of the first main body pipe portion 20 (right direction with respect to FIG. 1 and FIG. 2), a first port P1 protrudes in a direction perpendicular to the axial direction of the main body pipe portion 2. A second port P2 is concentrically provided at one end of the first main body tube portion 20 in the axial direction of the main body tube portion 2. In addition, the code | symbol A shown in FIG. 1 shows the flow path from the 1st port P1 to the 2nd port P2.

  On the other hand, an operating shaft 4 that reciprocates in the axial direction of the main body tube portion 2 is arranged in the main body tube portion 2 by the driving means 3. The valve body 5 is disposed so that the flow path A is closed (see FIG. 2) at the time indicated by the arrow S1 shown in FIG. A diaphragm 6 that always closes the other end portion of the first main body tube portion 20 is provided on the other end side of the operating shaft 4.

  The drive means 3 is composed of, for example, an air cylinder. A connecting rod 7 is connected to a piston rod of the cylinder, and the connecting rod 7 is connected to the other end side of the operating shaft 4 via a connecting member 8. ing. Thus, when the driving means 3 is driven, the operating shaft 4 moves forward, and the valve body 5 moves from the position shown in FIG. 2 to the position shown in FIG. 1 (arrow shown in FIG. 2). S2), and the flow path A is opened (see FIG. 1). Further, the operating shaft 4 moves backward, and the valve body 5 moves from the position shown in FIG. 1 to the position shown in FIG. 2 (see arrow S1 shown in FIG. 1), and the flow path A is closed. (See FIG. 2).

  On the other hand, the valve body 5 includes a valve body portion 5 a that opens and closes the flow path A, and this valve body portion 5 a comes in contact with and separates from a valve seat 20 b provided on one end surface of the first main body pipe portion 20. It has become.

  Such a valve body 5 is integrally formed with the operating shaft 4 and a metal material such as stainless steel, and the wetted parts thereof are thickened by a film 10 made of resinous (for example, fluororesin). The layers are integrally formed.

  The coating 10 forms the wetted portions of the operating shaft 4 and the valve body 5 in a thick layer, and forms the wetted portions of the diaphragm 6 in a thin layer. Thus, the coating 10 is an integrally molded product composed of the coating portion 10a on the operating shaft 4 side, the coating portion 10b on the valve body 5 side, and the coating portion 10c on the diaphragm 6 side.

  By the way, the diaphragm 6 includes a coating portion 10c integrally extending from the thick coating portion 10a on the operating shaft 4 side, and a synthetic rubber backup rubber 11 superposed on the back side of the coating portion 10c. A disk-shaped presser plate 12 that presses the backup rubber 11 from the back side is fitted over the other end of the operating shaft 4 and the connecting member 8 and attached to the connecting rod 7.

  Further, the outer peripheral edge of the diaphragm 6 is sandwiched between the other end of the first main body pipe portion 20 and one end of the second main body pipe portion 21, and is an end flange on the first main body pipe portion 20 side. It is attached by tightening 20c and the end flange 21a on the second main body pipe portion 21 side with a clamp 22. The diaphragm 6 is elastically deformed as the operating shaft 4 is reciprocated by the driving means 3.

  On the other hand, the second main body pipe portion 21 is attached to the driving means 3 by engaging the casing 30 of the driving means 3 with an end flange 21b provided at the other end and tightening it with a clamp 23. The first main body pipe portion 20 is provided with an air vent plug 24 that vents air from the diaphragm 6.

  Thus, in the method of assembling the diaphragm valve 1 configured as described above, after the actuating shaft 4 and the valve body 5 with the coating 10 attached are inserted into the first main body pipe portion 20 from one end thereof, the connecting rod 7 and the pressing plate 12 attached to the connecting member 8 and the backup rubber 11 are arranged on the other end side of the first main body pipe portion 20, and the connecting member 8 is screwed and coupled to the operating shaft 4. It polymerizes on the back surface of the film part 10c. Thereafter, the second main body pipe portion 21 is attached to the other end portion of the first main body pipe portion 20 using the clamp 22. In this state, the other end portion of the connecting rod 7 is coupled to the driving means 3, and one end portion of the casing 30 is attached to the other end portion of the second main body pipe portion 21 using the clamp 23. Thereby, the diaphragm valve 1 will be assembled.

  Here, the usage example of the diaphragm valve 1 configured as described above will be described. First, the diaphragm valve 1 is a liquid storage tank T that can store various liquids in the food industry, the pharmaceutical industry, and the like whose bottom is opened. Attached to. More specifically, when mounting, a diaphragm valve is first placed in the liquid storage tank T so that the valve body 5 is disposed in the liquid storage tank T from the bottom of the liquid storage tank T whose bottom is opened. 1 is inserted. After that, the end flange T1a of the tank spud T1 fixed to the bottom of the liquid storage tank T by welding or the like so that the inside of the liquid storage tank T and the second port P2 communicate with each other and the first main body pipe portion 20 side. The end flange 20d provided at the end is engaged and tightened with the clamp T2. As a result, the diaphragm valve 1 is attached to the bottom of the liquid storage tank T. When the end flange T1a of the tank spud T1 and the end flange 20d of the first main body pipe portion 20 are engaged and tightened by the clamp T2, the bottom of the liquid storage tank T is made of a synthetic rubber so as not to be uneven. The gasket T3 is interposed and tightened. The inner diameter of the tank spud T1 is larger than the outer diameter of the valve body 5 so that the valve body 5 can be inserted into the liquid storage tank T.

  After the diaphragm valve 1 is attached to the bottom of the liquid storage tank T in this way, when the various liquids flow into the liquid storage tank T, the operating shaft 4 is moved forward by the driving means 3 (see arrow S2 shown in FIG. 2). ), The valve body 5 is moved from the position shown in FIG. 2 to the position shown in FIG. Thereby, the valve body 5a is separated from the valve seat 20b, and the flow path A is opened. Therefore, as shown in FIG. 1, the liquid supplied from the first port P1 passes through the opened flow path A and exits from the second port P2, and flows into the liquid storage tank T. .

  On the other hand, in order to stop the inflow of the liquid supplied from the first port P1 into the liquid storage tank T, the operating shaft 4 is moved backward by the driving means 3 from the state where the flow path A is opened (see FIG. 1), the valve body 5 is moved from the position shown in FIG. 1 to the position shown in FIG. That is, when the valve body 5 is moved in the direction opposite to the flow path direction of the flow path A (see FIG. 1), the valve body portion 5a comes into contact with the valve seat 20b and the flow path A is closed. Thereby, the inflow into the liquid storage tank T of the liquid supplied from the 1st port P1 can be stopped.

  Therefore, according to the present embodiment, when the flow path A is closed, the valve body 5 is moved in the direction opposite to the flow path direction of the flow path A. There is no acceleration by A. Therefore, it is possible to prevent a water hammer generated when the flow path A is closed.

  In addition, the wetted parts of the operating shaft 4, the valve body 5 and the diaphragm 6 are formed by a resin film 10, and the film 10 includes a film part 10 a on the operating shaft 4 side and a film part 10 b on the valve body 5 side. And the membrane portion 10c on the diaphragm 6 side, so that various liquid soot and the like do not remain or accumulate.

  Therefore, by providing such a valve body 5 in the liquid storage tank T, stagnation due to accumulation does not occur at the bottom of the liquid storage tank T, so that the liquid stored in the liquid storage tank T is uniformly distributed. Can be stirred.

  Furthermore, when the diaphragm valve 1 is attached to the bottom of the liquid storage tank T, a tank spud fixed to the bottom of the liquid storage tank T by welding or the like so that the inside of the liquid storage tank T and the second port P2 communicate with each other. The end flange T1a of T1 and the end flange 20d provided on the first main body tube portion 20 side are engaged with each other and tightened with the clamp T2. Therefore, when attaching the diaphragm valve 1 to the bottom of the liquid storage tank T, since no attachment portion is provided on the coating 10, contamination caused by providing the attachment portion can be prevented. In this embodiment, the liquid is supplied from the first port P1 and discharged to the second port P2. However, the liquid may be discharged from the second port P2 to the first port P1. . Furthermore, in the present embodiment, the positional relationship of the first port P1 is merely an example, and is not limited to this. For example, you may provide a 1st port in the both-sides wall part 20a of the 1st main body pipe part 20. As shown in FIG.

Second Embodiment
Next, a diaphragm valve according to a second embodiment of the present invention will be specifically described with reference to FIGS. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The diaphragm valve 50 according to the present embodiment has substantially the same configuration as the diaphragm valve 1 shown in the first embodiment, but the main body pipe portion is different as shown in FIGS. That is, the main body pipe portion 51 includes a first main body pipe portion 20, a second main body pipe portion 21, and a third main body pipe portion 52. The third main body pipe portion 52 has a second port P11 projecting from one end thereof and an end flange 52a provided at the other end thereof. The third main body pipe portion 52 is attached to the first main body pipe portion 20 by engaging the end flange 20d of the first main body pipe portion 20 with the end flange 52a and fastening with the clamp 53. . When the end flange 52a of the third main body pipe portion 52 and the end flange 20d of the first main body pipe portion 20 are engaged and tightened with the clamp 53, the first main body pipe portion 20 and the third main body pipe portion 52 When the is attached, it is tightened with a synthetic rubber packing 54 so that there is no unevenness inside.

  On the other hand, unlike the diaphragm valve 1 shown in the first embodiment, a pair of first ports P10a and P10b are provided on the side wall portion 20a of the first main body pipe portion 20 concentrically in the left-right direction of the side wall portion 20a. The first main body pipe portion 20 is projected in a direction orthogonal to the axial direction. 3 and 4 indicates a flow path from the first port P10a located on the left side to the first port P10b located on the right side, and the reference C shown in FIG. 3 indicates the first channel located on the left side. The flow path from the 1 port P10a to the 2nd port P11 is shown.

  Thus, in the method of assembling the diaphragm valve 50 configured as described above, after the actuating shaft 4 and the valve body 5 with the coating 10 attached are inserted into the first main body tube portion 20 from one end thereof, the connecting rod 7 and the pressing plate 12 attached to the connecting member 8 and the backup rubber 11 are arranged on the other end side of the first main body pipe portion 20, and the connecting member 8 is screwed and coupled to the operating shaft 4. It polymerizes on the back surface of the film part 10c. Thereafter, the second main body pipe portion 21 is attached to the other end portion of the first main body pipe portion 20 using the clamp 22. In this state, the other end portion of the connecting rod 7 is coupled to the driving means 3, and one end portion of the casing 30 is attached to the other end portion of the second main body pipe portion 21 using the clamp 23. A third main body pipe portion 52 is attached to one end portion of the main body pipe portion 20 using a clamp 53 with a packing 54 interposed therebetween. Thereby, the diaphragm valve 50 will be assembled.

  In using the diaphragm valve 50 configured as described above, the operating shaft 4 is moved forward by the driving means 3 (see arrow S4 shown in FIG. 4), and the valve body 5 is moved from the position shown in FIG. Move to the position shown in FIG. Thereby, the valve body 5a is separated from the valve seat 20b, and the flow path C is opened (see FIG. 3). Accordingly, the liquid supplied from the first port P10a located on the left side passes through the flow path B and exits from the first port P10b located on the right side, and passes through the opened flow path C to the second port P11. Get out of.

  In closing the flow path C, the operating shaft 4 is moved backward by the driving means 3 from the state in which the flow path C is opened (see arrow S3 shown in FIG. 3), and the valve body 5 is moved to FIG. It moves from the position shown to the position shown in FIG. That is, when the valve body 5 is moved in the direction opposite to the flow path direction of the flow path C (see FIG. 3), the valve body portion 5a comes into contact with the valve seat 20b and the flow path C is closed (see FIG. 3). 4). As a result, the liquid supplied from the first port P10a located on the left side passes through the flow path B and exits from the first port P10b located on the right side.

  In this way, the liquid supplied from the first port P10a located on the left side always exits from the first port P10b located on the right side through the flow path B. And the liquid which came out of the 1st port P10b located in the right side in this way is again supplied from the 1st port P10a located in the left side, and loops in the port. Thereby, the liquid is circulated in the port. A part of the circulated liquid exits from the second port P11 through the flow path C when the flow path C is opened by the reciprocation of the valve body 5.

  Therefore, also in this embodiment, when closing the flow path C, the valve body 5 is moved in the direction opposite to the flow path direction of the flow path C. Will not be accelerated by. Therefore, it is possible to prevent a water hammer generated when the flow path C is closed.

  In this embodiment, the liquid is supplied from the first port P10a located on the left side. However, the liquid is supplied from the first port P10b located on the right side, and the liquid is discharged from the first port P10a located on the left side. You may make it go. The positional relationship between the first ports P10a and P10b and the second port P11 is merely an example, and is not limited to this. For example, the first port P10a located on the left side may not be provided, and only the first port P10b located on the right side may be provided. In that case, the liquid is not circulated. On the other hand, the second port P11 may protrude from both side walls or one side wall of the third main body pipe portion 52 in a direction orthogonal to the axial direction of the main body pipe portion 51. And when the 2nd port P11 is made to project in the both-sides wall part or one side wall part of the 3rd main body pipe part 52, the 1st port P10b located in the right side is not provided, but only the 1st port P10a located in the left side May be provided.

DESCRIPTION OF SYMBOLS 1,50 Diaphragm valve 2,51 Main body pipe part 3 Driving means 4 Actuating shaft 5 Valve body 6 Diaphragm 10 Coating 10a (Operating shaft side) Coating part 10b (Valve side) Coating part 10c (Diaphragm side) Coating part 20 1st main body pipe part 20a Side wall part 21 (of 1st main body pipe part) 2nd main body pipe part 52 3rd main body pipe parts P1, P10a, P10b 1st port P2, P11 2nd port A, C Flow path T Liquid storage tank

Claims (2)

A main body tube portion, a first port projecting in a direction perpendicular to the axial direction of the main body tube portion on a side wall portion of the main body tube portion, and an axial direction of the main body tube portion on one end side of the main body tube portion Alternatively, a second port provided in a direction orthogonal to the axial direction, a metal operating shaft that is disposed in the main body pipe portion and that is connected to the driving means and reciprocates in the axial direction, and one end of the operating shaft And a metal valve body that can open and close the flow path from the first port to the second port, the other end of the operating shaft, and the other of the main body pipe portion A diaphragm that always closes the end,
The wetted parts of the metal operating shaft, metal valve body and diaphragm are formed by a resin film, and the operating shaft side film part, the valve body side film part, and the diaphragm side film part are integrated. Formed into
The said valve body is connected with the said operating shaft in the position which can close the said flow path from the reverse direction to the said flow path direction, when closing the said flow path, The diaphragm valve characterized by the above-mentioned . The outer peripheral edge of the one end portion of the main body pipe portion is attached to the bottom of the liquid storage tank so that the liquid storage tank capable of storing various liquids and the second port communicate with each other.
2. The diaphragm valve according to claim 1, wherein the valve body is disposed in the liquid storage tank so that the flow path can be closed from a direction opposite to the flow path direction .

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