Diaphragm damage detection device and reciprocation pump device

Abstract

To provide a diaphragm damage detection device in which an erroneous operation does not occur even if a gas component contained in an air bubble which is generated in a pump chamber permeates a diaphragm, and a reciprocation pump device.SOLUTION: A diaphragm damage detection device 3 according to the present invention detects the damage of a diaphragm 25 of a reciprocation pump 2. The diaphragm damage detection device has a fluid path FP which can communicate with a penetration hole 24a of a peripheral edge ring 24, a pressure detector 8 for detecting pressure in the fluid path, a gas discharge valve GV connected to the fluid path, and a discharge path 65 connected to the gas discharge valve. The gas discharge valve comprises a valve body 9, a valve chamber Rv for accommodating the valve body, and a valve seat face 42b arranged upward of the valve body. The discharge path is opened at the valve seat face. The valve body is movable between a valve-closing position P2 and a valve-opening position P1, and located in the valve-opening position when the diaphragm is not damaged. When the valve body is not located in the valve-closing position, the valve chamber communicates with the fluid path and the discharge path.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a diaphragm breakage detection device and a reciprocating pump device. [Background technology]

[0002] A reciprocating pump sucks and discharges pumped liquid by reciprocating a membrane-like diaphragm. The diaphragm is housed in a housing of the reciprocating pump and divides a space (diaphragm chamber) in the housing into a fluid pressure chamber and a pump chamber. The fluid pressure chamber is filled with a working fluid (e.g., oil), and a plunger that reciprocates within the fluid pressure chamber is disposed so as to face the diaphragm. The reciprocating movement of the plunger causes the diaphragm to reciprocate. As a result, the volume of the pump chamber changes, the pumped liquid is sucked into the pump chamber, and the pumped liquid is discharged from the pump chamber. In a reciprocating pump configured in this manner, if the diaphragm is damaged, not only will the performance of the reciprocating pump decrease, but the working fluid may also be mixed into the pumped liquid. For this reason, some reciprocating pumps are known that are equipped with a diaphragm damage detection device (hereinafter simply referred to as a "detection device") that detects damage to the diaphragm (see, for example, Patent Document 1).

[0003] In the reciprocating pump disclosed in Patent Document 1, a diaphragm is formed by closely contacting two diaphragm sheets. A ring-shaped peripheral ring is attached between the outer edges of the two diaphragm sheets. The peripheral ring has a through hole that penetrates the peripheral ring in the radial direction of the peripheral ring. A pipe connected to a pressure gauge is connected to the through hole. In this configuration, if one of the two diaphragm sheets is damaged for some reason during operation of the reciprocating pump, the working fluid or handled liquid flows between the two diaphragm sheets and into the through hole and the pipe. As a result, the pressure in the fluid pressure chamber or pump chamber is transmitted to the pressure gauge via the inflowing liquid, and the damage of the diaphragm can be detected by an increase in the indicated value of the pressure gauge. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-132149 Summary of the Invention [Problem to be solved by the invention]

[0005] In general, the diaphragm is made of synthetic resin such as rubber or fluororesin. When these synthetic resins are thinned, they have fine holes (gaps) that do not allow liquid to pass through but allow gas to pass through. In other words, a thinned synthetic resin diaphragm has a certain degree of gas permeability. Therefore, when a handled liquid that is prone to generating bubbles due to an increase or decrease in the pressure of the handled liquid in the pump chamber (for example, a handled liquid containing a large amount of dissolved gas, a handled liquid that is prone to vaporization, etc.) is pumped, the bubbles generated in the pump chamber can pass through the diaphragm. As a result, the gas components that make up the bubbles remain in the detection device, causing a malfunction in which the pressure gauge reading increases even though the diaphragm is not damaged.

[0006] An object of the present invention is to provide a diaphragm damage detection device and a reciprocating pump device which do not malfunction even if gas components in a pump chamber pass through a diaphragm. [Means for solving the problem]

[0007] A diaphragm breakage detection device in one embodiment of the present invention is a diaphragm breakage detection device that is attached to a reciprocating pump that sucks in and discharges a pumped liquid by the reciprocating motion of a diaphragm formed by tightly contacting two diaphragm sheets, and detects breakage of the diaphragm, wherein the reciprocating pump comprises the diaphragm and an annular peripheral ring that is arranged between the outer edges of the two diaphragm sheets, and the diaphragm breakage detection device comprises a fluid path that can communicate with a through hole that penetrates the peripheral ring in the radial direction of the peripheral ring, a pressure detector that detects the pressure in the fluid path, a gas exhaust valve that is arranged above the fluid path and connected to the fluid path, and a gas exhaust valve that detects breakage of the gas exhaust valve. the gas exhaust valve includes a valve body, a valve chamber connected to the fluid pathway and accommodating the valve body, and a valve seat surface disposed above the valve body and facing the valve body, the exhaust pathway opens to the valve seat surface, and the valve body is movable between a closed position where the valve body abuts against the valve seat surface and covers the exhaust pathway, and an open position where the valve body moves away from the valve seat surface and does not cover the exhaust pathway, and when the diaphragm is not damaged, the valve chamber is in communication with the fluid pathway and the exhaust pathway.

[0008] A reciprocating pump device in one embodiment of the present invention comprises a reciprocating pump having a flexible diaphragm formed by tightly contacting two diaphragm sheets, a circular peripheral ring arranged between the outer edges of the two diaphragm sheets, and a connecting tube connected to a through hole that penetrates the peripheral ring in the radial direction of the peripheral ring, and a diaphragm breakage detection device as described in the above-mentioned embodiment that is attached to the reciprocating pump and detects breakage of the diaphragm. Effect of the Invention

[0009] According to the present invention, it is possible to provide a diaphragm damage detection device and a reciprocating pump device which do not malfunction even if gas components in a pump chamber pass through the diaphragm. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing an embodiment of a reciprocating pump device according to the present invention; [Diagram 2] 2 is a partially enlarged schematic cross-sectional view of a peripheral ring and a diaphragm included in the reciprocating pump device of FIG. 1. [Diagram 3] 2 is a schematic diagram of a diaphragm breakage detection device provided in the reciprocating pump device of FIG. 1. [Figure 4] 4 is a partially enlarged schematic cross-sectional view of a housing provided in the diaphragm breakage detection device of FIG. 3. [Diagram 5] 4 is a partially enlarged schematic cross-sectional view of a gas release valve provided in the diaphragm breakage detection device of FIG. 3. [Figure 6] 4 is a schematic diagram showing the operation of the diaphragm breakage detection device of FIG. 3 when the diaphragm of FIG. 2 is not broken. [Figure 7] 4 is a schematic diagram showing the operation of the diaphragm breakage detection device of FIG. 3 when the diaphragm of FIG. 2 is broken. [Figure 8] 6 is a schematic diagram showing the operation of the diaphragm breakage detection device of FIG. 3 after the gas exhaust valve of FIG. 5 is closed. [Figure 9] 1. FIG. 4(a) is a schematic diagram showing the arrangement of a diaphragm breakage detection device of FIG. 3 according to a modified example in the reciprocating pump device of FIG. 1, and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of a diaphragm breakage detection device (hereinafter referred to as "this detection device") and a reciprocating pump device (hereinafter referred to as "this pump device") according to the present invention will be described. In the following description, the drawings will be referred to as appropriate. In each drawing, the same members and elements are given the same symbols, and duplicated explanations will be omitted. Furthermore, the dimensional ratios of each element may be exaggerated for the convenience of explanation, and are not limited to the ratios shown in each drawing.

[0012] ●Reciprocating pump device● ●Configuration of reciprocating pump device FIG. 1 is a schematic diagram showing an embodiment of the pump device.

[0013] The pump device 1 sucks and discharges a pumped liquid L1. The pump device 1 includes a reciprocating pump 2 and a detection device 3.

[0014] The "handled liquid L1" is a liquid that is pumped by the pump device 1. In this embodiment, the handled liquid L1 is, for example, water.

[0015] In the present invention, the handled liquid L1 is not limited to water. That is, for example, the handled liquid L1 may be a liquid having a specific gravity of more than "1" (e.g., sulfuric acid, etc.), a liquid having a specific gravity of less than "1" (e.g., fuel oil, etc.), a liquid that is easily vaporized (e.g., liquefied gas, etc.), or a liquid containing a large amount of dissolved gas (e.g., liquid pressurized by gas, etc.).

[0016] The configuration of the reciprocating pump 2 is the same as that of a known reciprocating pump (diaphragm pump) that sucks in and discharges pumped liquid by the reciprocating motion of a diaphragm. Therefore, in the following description, only the outline of the configuration of the reciprocating pump 2 is described, and a detailed description is omitted. The reciprocating pump 2 includes a housing 21, a suction pipe 22, a discharge pipe 23, a peripheral ring 24, a diaphragm 25, a plunger 26, a drive unit 27, and a connecting pipe 28.

[0017] The housing 21 houses the plunger 26 and the driving device 27. A part of the housing 21 forms a diaphragm head 21a that sandwiches the peripheral ring 24 and defines a diaphragm chamber R1 that houses a central portion 252 (reciprocating portion) of the diaphragm 25 described later.

[0018] The suction pipe 22 is connected to the diaphragm head 21a, and functions as a path for the pumped liquid L1 to be sucked into the diaphragm chamber R1 (the pump chamber R3, which will be described later).

[0019] The discharge pipe 23 is connected to the diaphragm head 21a, and functions as a path for the pumped liquid L1 discharged from the diaphragm chamber R1 (the pump chamber R3, which will be described later).

[0020] The peripheral ring 24 holds the diaphragm 25. The peripheral ring 24 has a ring plate shape (i.e., annular). The peripheral ring 24 has at least one through hole 24a. In the radial direction of the peripheral ring 24, the through hole 24a is a hole that penetrates from the inner peripheral surface to the outer peripheral surface of the peripheral ring 24.

[0021] FIG. 2 is a partially enlarged schematic cross-sectional view of the peripheral ring 24 and the diaphragm 25. As shown in FIG. In the following description, FIG. 1 will be referred to as appropriate.

[0022] The diaphragm 25 reciprocates to suck the treated liquid L1 into the pump chamber R3 described below and discharge the treated liquid L1 from the pump chamber R3. An outer edge portion 251 of the diaphragm 25 is attached to the peripheral ring 24 with a central portion 252 of the diaphragm 25 having a predetermined tension. Specifically, the diaphragm 25 is formed by overlapping and closely contacting two circular film-like diaphragm sheets 25a and 25b. The diaphragm sheets 25a and 25b are made of a synthetic resin such as PTFE (polytetrafluoroethylene). An outer edge portion 25c of the diaphragm sheet 25a is spaced from an outer edge portion 25d of the diaphragm sheet 25b, and the peripheral ring 24 is disposed between the outer edges 25c and 25d. Outer edge portion 25c is attached to peripheral ring 24 by central portion 25e of diaphragm sheet 25a with a predetermined tension, and outer edge portion 25d is attached to peripheral ring 24 by central portion 25f of diaphragm sheet 25b with a predetermined tension. Central portion 25e of diaphragm sheet 25a is in close contact with central portion 25f of diaphragm sheet 25b. Outer edge portions 25c and 25d form outer edge portion 251, and central portions 25e and 25f form central portion 252.

[0023] As described above, the peripheral ring 24 is sandwiched by the diaphragm head 21a. The central portion 252 of the diaphragm 25 is disposed in the diaphragm chamber R1, and divides the diaphragm chamber R1 into a fluid pressure chamber R2 (a space facing the diaphragm seat 25b) and a pump chamber R3 (a space facing the diaphragm seat 25a). The fluid pressure chamber R2 is filled with a working fluid (e.g., oil) L2. The pump chamber R3 is filled with a pumped liquid L1 while the pump device 1 is in operation. In the following description, the "forward direction" is the direction in which the pump chamber R3 is located relative to the diaphragm 25, and the "rearward direction" is the direction in which the fluid pressure chamber R2 is located relative to the diaphragm 25.

[0024] In the following description, reference will be primarily made to FIG. The plunger 26 reciprocates to reciprocate the central portion 252 of the diaphragm 25 via the working fluid L2. The plunger 26 is disposed behind the diaphragm 25 so as to face the central portion 252 of the diaphragm 25 and to reciprocate relative to the fluid pressure chamber R2.

[0025] The driving device 27 reciprocates the plunger 26. The driving device 27 includes, for example, a motor (not shown) and a transmission mechanism (not shown) that transmits the power of the motor to the plunger 26.

[0026] The connecting pipe 28 is a pipe that connects the through hole 24a of the peripheral ring 24 to a fluid path FP, which will be described later. One end of the connecting pipe 28 is connected to the through hole 24a.

[0027] In the present invention, the connecting pipe 28 is not limited to a pipe as long as it is configured to connect the through hole 24a and the fluid path FP. That is, for example, the connecting pipe 28 may be a tubular joint.

[0028] The detection device 3 detects damage to the diaphragm 25. The detection device 3 is attached to the diaphragm head 21a of the reciprocating pump 2. The specific configuration of the detection device 3 will be described later.

[0029] ●Diaphragm damage detection device● ● Diaphragm damage detection device configuration FIG. 3 is a schematic diagram of the present detection device 3. For convenience of explanation, the figure also shows a schematic diagram of a part of the configuration of the reciprocating pump 2. In the following explanation of the present detection device 3, FIG.

[0030] The present detection device 3 includes a housing 4, a connection portion 5, an internal path 6, a one-way valve 7, a pressure detector 8, a valve body 9, and a drain valve 10. The main configuration of the present detection device 3 is the same as that of a conventional diaphragm breakage detection device (hereinafter referred to as the "conventional detection device"), except that the present detection device 3 includes a gas exhaust valve GV described below.

[0031] FIG. 4 is a partially enlarged schematic cross-sectional view of the housing 4. As shown in FIG. The figure shows an enlarged view of the gas discharge valve GV and its vicinity, and shows the valve body 9 in a non-sectional view.

[0032] The housing 4 contains the internal passage 6 and also functions as a housing for the gas exhaust valve GV. The housing 4 is made of a metal such as stainless steel. The housing 4 is attached to the diaphragm head 21a, for example, so that a second passage 62, a through hole 43c, and a fifth passage 65 (their axial directions) described below extend along the up-down direction. In the front-rear direction, the housing 4 is disposed, for example, behind the through hole 24a. The housing 4 includes a first housing 41, a second housing 42, and a third housing 43.

[0033] The first housing 41 contains therein a first path 61, a second path 62, a third path 63, and a fourth path 64, which will be described later. The first housing 41 has, for example, a cylindrical shape.

[0034] The second housing 42 contains a fifth passage 65, which will be described later. The shape of the second housing 42 is, for example, cylindrical. The center of the lower surface 42a of the second housing 42 is a conical surface that is conically recessed upward (i.e., an inverted conical surface), and functions as a valve seat surface 42b, which will be described later. The second housing 42 is disposed above the first housing 41, and is attached to the first housing 41 by bolts (not shown).

[0035] The third housing 43 contains the second passage 62 and the valve chamber Rv, which will be described later. The third housing 43 is, for example, cylindrical in shape and flat in the vertical direction. The third housing 43 is provided with a through hole 43c that opens in the center of the upper surface 43a and the lower surface 43b of the third housing 43. The through hole 43c includes a large diameter portion 43d, a small diameter portion 43e, a step portion 43f, and a plurality of groove portions 43g. The large diameter portion 43d is cylindrical in shape, and the small diameter portion 43e is substantially cylindrical in shape. The inner diameter of the large diameter portion 43d is larger than the inner diameter of the small diameter portion 43e. The large diameter portion 43d is provided above the small diameter portion 43e and adjacent to the small diameter portion 43e. The step portion 43f is formed by a ring-shaped bottom portion of the large diameter portion 43d. A portion of the peripheral surface of the small diameter portion 43e is recessed radially outward from the upper end to the lower end of the small diameter portion 43e to form a groove portion 43g. The small diameter portion 43e and the groove portion 43g function as a part of a fluid path FP described later.

[0036] The third housing 43 is disposed between the upper surface 41a of the first housing 41 and the lower surface 42a of the second housing 42, and is sandwiched between the first housing 41 and the second housing 42. At this time, the valve seat surface 42b is disposed above the large diameter portion 43d, and covers the large diameter portion 43d from above. As a result, the valve seat surface 42b and the large diameter portion 43d define a substantially cylindrical space (hereinafter referred to as the "valve chamber Rv") inside the housing 4. In addition, the first to third housings 41 to 43 can be easily disassembled by simply removing the bolts. Between the first housing 41 and the third housing 43 and between the second housing 42 and the third housing 43, sealing members (not shown), such as O-rings and gaskets, are appropriately disposed.

[0037] The connection part 5 is, for example, a known tubular joint to which the connection pipe 28 is connected. The connection part 5 is attached to the housing 4 (first housing 41) so as to communicate with the internal passage 6 (first passage 61 described below). The other end of the connection pipe 28 is connected to the connection part 5, and the connection pipe 28 communicates with the internal passage 6 via the connection part 5.

[0038] The internal path 6 is disposed (formed) inside the housing 4 (first housing 41), and is a path through which a fluid (hereinafter referred to as an "inflow fluid") flows that has flowed (permeated) from the diaphragm 25 into the through-hole 24a. That is, the housing 4 contains the internal path 6. The internal path 6 includes a first path 61, a second path 62, a third path 63, a fourth path 64, and a fifth path 65.

[0039] The "inflow fluid" is a fluid that passes through or permeates the diaphragm 25, permeates the through hole 24a, and flows (permeates) into the internal path 6 via the connecting pipe 28 and the connecting portion 5. The fluid that passes through the diaphragm 25 (hereinafter referred to as the "passing fluid") is, for example, the handled liquid L1 and / or the working fluid L2 that passes through the diaphragm sheets 25a, 25b from the broken portion X (see FIG. 7; the same applies below) when the diaphragm sheets 25a, 25b (the diaphragm 25) are broken, and flows (permeates) between the diaphragm sheets 25a, 25b. The fluid that has permeated the diaphragm 25 (hereinafter referred to as the "permeating fluid") is, for example, air bubbles generated based on gas components (dissolved gas) dissolved in the handled liquid L1, air bubbles contained in the handled liquid L1, and / or air bubbles generated by vaporization of the handled liquid L1. As described above, since the diaphragm sheets 25a, 25b (diaphragm 25) are made of synthetic resin, liquids (handled liquid L1, working fluid L2) do not permeate the diaphragm 25, but some gases (dissolved gas, etc.) can permeate the diaphragm 25. In the following description, the "upstream side" refers to the upstream side in the flow of the inflow fluid in the internal path 6, and the "downstream side" refers to the downstream side in the flow of the inflow fluid in the internal path 6.

[0040] The first path 61 and the second path 62 are paths through which the inflow fluid flows between the connection part 5 and the gas discharge valve GV. The first path 61 is disposed inside the first housing 41 so as to extend in series with the second path 62 (for example, in the vertical direction (horizontal direction)). The upstream end 61a of the first path 61 is connected to the connection part 5, and the downstream end 61b of the first path 61 is connected to the one-way valve 7. That is, the first path 61 is connected to the connection pipe 28 via the connection part 5, and can be connected to the second path 62 via the one-way valve 7. The second path 62 is disposed inside the first housing 41 so as to extend along the up-down direction. The upstream end 62a of the second path 62 is connected to the one-way valve 7. The downstream end 62b of the second path 62 opens to the center of the upper surface 41a of the first housing 41, and communicates with the small diameter part 43e and the groove part 43g of the third housing 43 disposed above the downstream end 62b. Therefore, the downstream end 62b of the second path 62 is disposed higher than the upstream end 62a of the second path 62, and the small diameter portion 43e and the groove portion 43g are disposed higher than the downstream end 62b. The first path 61, the second path 62, the small diameter portion 43e and the groove portion 43g form a fluid path FP that allows the inflow fluid from the connecting pipe 28 to flow to the gas discharge valve GV.

[0041] The third path 63 is a drain path used when the fluid (mainly the passing fluid) that has flowed into the second path 62 is discharged to the outside of the housing 4. The third path 63 is disposed inside the first housing 41. An upstream end 63a of the third path 63 is connected to the second path 62, and a downstream end 63b of the third path 63 opens to the outer surface of the housing 4 (the first housing 41).

[0042] The fourth path 64 is a pressure port connected between the second path 62 and the pressure detector 8 so that the pressure detector 8 detects the pressure of the fluid in the second path 62. The fourth path 64 is disposed inside the first housing 41.

[0043] The fifth path 65 is a path through which the permeated fluid that has flowed into the fluid path FP passes when it is discharged to the outside of the housing 4. The fifth path 65 is disposed inside the second housing 42 so as to extend in the up-down direction. An upstream end 65a of the fifth path 65 opens to the center of the valve seat surface 42b, and a downstream end 65b of the fifth path 65 opens to the outer surface of the housing 4 (the second housing 42). The fifth path 65 is an example of a discharge path in the present invention.

[0044] The one-way valve 7 is a known check valve that is disposed between the first path 61 and the second path 62 and configured to pass fluid only from the first path 61 to the second path 62. In other words, the one-way valve 7 is attached to the fluid path FP and configured to pass fluid only from the through hole 24a side to the gas discharge valve GV side.

[0045] The pressure detector 8 detects the pressure (of the fluid) in the second path 62. The pressure detector 8 is, for example, a known pressure gauge.

[0046] In the present invention, the pressure detector 8 is not limited to a pressure gauge as long as it can detect the pressure inside the second path 62. That is, for example, the pressure detector 8 may be a known pressure switch or pressure sensor.

[0047] The valve element 9 functions as a valve element of the gas discharge valve GV, and moves between a valve open position P1 and a valve closed position P2, which will be described later, based on the flow of the passing fluid. As will be described later, the material of the valve element 9 is determined based on the specific gravity difference with the treated liquid L1 and / or the terminal velocity (also called terminal settling velocity or terminal velocity) with respect to the treated liquid L1 (working fluid L2), and is made of polypropylene (PP) in this embodiment. The shape of the valve element 9 is determined corresponding to the shape of the valve seat surface 42b for the valve element 9, and is spherical in this embodiment. The valve element 9 is accommodated in the valve chamber Rv. The diameter of the valve element 9 is smaller than the inner diameter of the large diameter portion 43d of the third housing 43 and larger than the inner diameter of the small diameter portion 43e. That is, a gap S is formed between the valve element 9 and the large diameter portion 43d in the horizontal direction.

[0048] The drain valve 10 is a drain valve used when discharging the fluid (mainly the passing fluid) that has flowed into the second path 62 to the outside of the housing 4. The drain valve 10 is attached in the third path 63.

[0049] Gas exhaust valve configuration FIG. 5 is a partially enlarged schematic cross-sectional view of the gas release valve GV. The figure shows a non-sectional view of the valve element 9. For ease of explanation, the figure shows the valve element 9 and the second path 62 by two-dot chain lines when the valve element 9 is located at the valve closing position P2. For ease of explanation, the figure shows the valve opening position P1 and the valve closing position P2 at the center positions of the valve element 9.

[0050] The gas exhaust valve GV is a valve that exhausts the permeated fluid that has flowed into the second path 62 to the outside of the housing 4 and retains the passing fluid that has flowed into the second path 62 inside the housing 4. That is, the gas exhaust valve GV functions as a valve that exhausts gas from the fifth path 65 and does not exhaust liquid from the fifth path 65. The gas exhaust valve GV is composed of at least a valve seat surface 42b, a valve chamber Rv, and a valve body 9. That is, the gas exhaust valve GV includes a valve seat surface 42b, a valve chamber Rv, and a valve body 9. The gas exhaust valve GV is disposed above the fluid path FP and is connected to the fluid path FP and the fifth path 65. As described above, the valve body 9 is accommodated in the valve chamber Rv. In the vertical direction, the valve seat surface 42b is disposed above the valve body 9 so as to face the valve body 9. In the valve chamber Rv, the valve body 9 is movable between a valve open position P1 and a valve closed position P2. The valve element 9 moves along the valve chamber Rv (large diameter portion 43d). Therefore, the direction of movement is along the axial direction (vertical direction) of the large diameter portion 43d.

[0051] The "valve open position P1" is a position where the valve element 9 does not cover (block) the fifth passage 65 from below. In the present invention, the valve open position P1 is the lowest position in the movement range of the valve element 9 in the valve chamber Rv. In other words, the valve open position P1 is the position where the valve element 9 is farthest from the valve seat surface 42b in the valve chamber Rv. When the valve element 9 is located in the valve open position P1, the valve element 9 abuts against the step portion 43f, the upper part of the small diameter portion 43e is blocked by the valve element 9, and the upper part of the groove portion 43g is not blocked by the valve element 9. Therefore, the valve chamber Rv communicates with the second passage 62 through the groove portion 43g. In addition, the valve element 9 does not abut against the valve seat surface 42b, and the fifth passage 65 is not blocked by the valve element 9. Therefore, the valve chamber Rv communicates with the fifth passage 65. Here, when the valve body 9 is located in the valve open position P1, the shortest distance between the valve body 9 and the valve seat surface 42b in the vertical direction (i.e., the distance that the valve body 9 can move) is set to a small length, for example, approximately 10 to 20% of the diameter of the valve body 9.

[0052] The "valve closed position P2" is a position where the valve disc 9 covers (blocks) the fifth passage 65 from below. In the present invention, the valve closed position P2 is the highest position where the valve disc 9 abuts against the valve seat surface 42b and is within the moving range of the valve disc 9 in the valve chamber Rv. That is, in the vertical direction, the valve closed position P2 is located above (directly above in this embodiment) the valve open position P1.

[0053] When the specific gravity of the valve element 9 is smaller than that of the handled liquid L1, the valve element 9 floats on the handled liquid L1. Therefore, when the handled liquid L1 flows into the valve chamber Rv, the valve element 9 moves from the valve open position P1 to the valve closed position P2 together with the handled liquid L1, and covers (blocks) the fifth path 65. At this time, the gas discharge valve GV is closed. In this embodiment, the handled liquid L1 is water, and the valve element 9 is made of PP. That is, the specific gravity of the valve element 9 is smaller than that of the handled liquid L1, and the valve element 9 moves in the valve chamber Rv together with the handled liquid L1.

[0054] On the other hand, when the specific gravity of the valve disc 9 is greater than that of the handled fluid L1, the valve disc 9 does not float on the handled fluid L1. Even in this case, if the flow velocity of the handled fluid L1 flowing in the valve chamber Rv, particularly in the gap S between the valve disc 9 and the large diameter portion 43d, is greater than the terminal velocity of the valve disc 9 relative to the handled fluid L1, the valve disc 9 is pushed up by the flow of the handled fluid L1 and can move from the valve open position P1 to the valve closed position P2. Here, the terminal velocity "Vs" of the valve disc 9 (in the fluid) relative to the fluid (handled fluid L1) is calculated based on an equation expressing the terminal velocity, such as the Stokes equation.

[0055] In addition, the flow velocity "Vf" of a fluid flowing at a flow rate "Q" through a pipe with a cross-sectional area "A" is expressed by the following equation (1).

[0056] Vf=Q / A (1)

[0057] Therefore, by designing the shape of the large diameter portion 43d and the valve body 9 (the cross-sectional area "A" of the gap S) so as to satisfy the relationship "Vf>Vs" (preferably "Vf>>Vs"), the valve body 9 moves to the closed position P2 due to the flow of the handled liquid L1.

[0058] Here, when the passing fluid is the working fluid L2, the shape of the large diameter portion 43d and the valve body 9 (cross-sectional area "A" of the gap S) can be designed based on the terminal velocity of the working fluid L2, similarly to the handled fluid L1. Therefore, the shape of the large diameter portion 43d and the valve body 9 (cross-sectional area "A" of the gap S) is designed so that the valve body 9 can move to the valve-closed position P2 regardless of whether the handled fluid L1 or the working fluid L2 flows into the valve chamber Rv. As described above, the housing 4 can be divided into the first to third housings 41 to 43. And, in the valve chamber Rv, the large diameter portion 43d that determines the cross-sectional area "A" of the gap S is disposed in the replaceable third housing 43. Therefore, an appropriate gap S corresponding to the shape and specific gravity of the valve body 9 can be formed simply by replacing the third housing 43 with another third housing 43 having a different shape of the through hole 43c (large diameter portion 43d). That is, the flow velocity "Vf" that drives the movement of the valve element 9 can be relatively easily adjusted by changing the terminal velocity "Vs". Similarly, the shape of the valve seat surface 42b can also be arbitrarily selected by replacing the second housing 42.

[0059] In the present invention, the flow velocity may be calculated using the cross-sectional area of ​​the valve chest Rv or the small diameter portion 43e instead of the gap S. In this case, the cross-sectional area of ​​the valve chest Rv or the small diameter portion 43e is larger than the cross-sectional area of ​​the gap S. Therefore, the flow velocity of the handled fluid L1 in the valve chest Rv or the small diameter portion 43e is slower than the flow velocity in the gap S. If the relationship "Vf>Vs" is satisfied under this condition, the relationship "Vf>Vs" is also surely satisfied in the gap S. In this configuration, it is not necessary to take the cross-sectional area of ​​the valve body 9 into consideration, and the flow velocity can be simply calculated using only the cross-sectional area of ​​the path.

[0060] Operation of reciprocating pump unit Next, the operation of the pump device 1 will be described below, focusing on the operation of the detection device 3. In the following description, Figs. 1 to 5 will be referred to as appropriate.

[0061] During operation of the pump device 1, the drive device 27 reciprocates the plunger 26 to reciprocate the diaphragm 25 (center portion 252) via the working fluid L2. At this time, in response to the reciprocating motion of the diaphragm 25, the handled liquid L1 is sucked into the pump chamber R3 from the suction pipe 22, and the handled liquid L1 in the pump chamber R3 is discharged to the discharge pipe 23. Here, when the handled liquid L1 is sucked into the pump chamber R3 from the suction pipe 22, the pressure applied to the handled liquid L1 in the pump chamber R3 is reduced, and the dissolved gas in the handled liquid L1 in the pump chamber R3 may emerge as bubbles (gas bubbles) in the pump chamber R3. In particular, when a storage tank for the handled liquid L1 connected to the upstream side of the flow of the handled liquid L1 from the suction pipe 22 is pressurized with a gas (e.g., N2 or H2), the gas component dissolves in the handled liquid L1 and is likely to form bubbles in the pump chamber R3.

[0062] 6 is a schematic diagram showing the operation of the detection device 3 when the diaphragm 25 is not damaged. In the figure, the flow of the permeating fluid (gas component) is indicated by white arrows. For convenience of explanation, the figure shows the valve open position P1 as the center position of the valve body 9.

[0063] When the diaphragm 25 is not damaged, the handled liquid L1 and the working fluid L2 do not pass through the diaphragm 25 and do not flow into the through hole 24a, the connecting pipe 28, and the internal passage 6. In other words, the passing fluid does not flow into the internal passage 6. On the other hand, some of the bubbles present in the pump chamber R3 permeate the diaphragm 25. As a result, the gas components constituting the bubbles flow into the first passage 61 as a permeating fluid through the through hole 24a and the connecting pipe 28 from between the diaphragm sheets 25a and 25b. When the pressure of the permeating fluid that has flowed into the first passage 61 becomes equal to or higher than the pressure that opens the one-way valve 7, the permeating fluid flows into the second passage 62 and the small diameter portion 43e, and flows into the valve chamber Rv through the groove portion 43g. Here, the flow rate of the permeating fluid in the valve chamber Rv (gap S) is extremely small compared to the flow rate of the passing fluid, and the specific gravity of the gas components that are the permeating fluid is extremely small compared to the specific gravity of the valve body 9. Therefore, even if the permeated fluid passes through the gap S, the valve element 9 does not move from the valve open position P1. In other words, the valve element 9 is not located at the valve closed position P2. That is, the gas exhaust valve GV is open. At this time, the valve chamber Rv communicates with the second path 62 via the groove portion 43g and the small diameter portion 43e, and communicates with the fifth path 65. Therefore, the permeated fluid that has flowed into the valve chamber Rv is discharged to the outside of the housing 4 via the fifth path 65 without remaining in the fluid path FP. As a result, the pressure in the second path 62 (the pressure of the permeated fluid) becomes approximately the same as the atmospheric pressure, and the indication of the pressure detector 8 does not change.

[0064] 7 is a schematic diagram showing the operation of the present detection device 3 when the diaphragm 25 is damaged. The figure shows the state of the present detection device 3 at the timing when a part of the diaphragm sheet 25a in contact with the handled liquid L1 is damaged and the gas discharge valve GV is closed. In the figure, the flow of the passing fluid is indicated by gray arrows. For the sake of convenience, the figure shows the valve closing position P2 as the center position of the valve body 9.

[0065] When the diaphragm 25 is broken (the diaphragm sheet 25a is broken), the handled liquid L1 passes through the diaphragm sheet 25a from the broken portion X and flows between the diaphragm sheets 25a and 25b. At this time, a pressure equal to the discharge pressure is applied to the handled liquid L1 that has flowed in. Therefore, the handled liquid L1 that has flowed in between the diaphragm sheets 25a and 25b breaks the adhesion between the diaphragm sheets 25a and 25b and flows into the first path 61 as a passing fluid through the through hole 24a and the connecting pipe 28. The pressure of the handled liquid L1 that has flowed into the first path 61 is sufficiently greater than the pressure that opens the one-way valve 7. Therefore, the handled liquid L1 instantly opens the one-way valve 7, flows into the second path 62 and the small diameter portion 43e, and flows into the valve chamber Rv through the groove portion 43g. As described above, since the specific gravity of the valve element 9 is smaller than that of the treated liquid L1, the valve element 9 moves to the valve-closed position P2 together with the treated liquid L1. At this time, the valve element 9 is guided by the valve seat surface 42b, which is a conical surface, and liquid-tightly abuts against the valve seat surface 42b so as to concentrically surround the periphery of the fifth passage 65 when viewed from below. As a result, the valve element 9 covers a part (upper end) of the valve chamber Rv and the fifth passage 65 from below. In other words, the fifth passage 65 is liquid-tightly blocked by the valve element 9. In this way, the gas discharge valve GV closes, preventing the movement of the treated liquid L1 to the fifth passage 65. As described above, since the movable distance of the valve element 9 is small, the movement of the valve element 9 from the valve-opened position P1 to the valve-closed position P2 is completed in an extremely short time. Therefore, leakage of the treated liquid L1 into the fifth path 65 does not occur (even if leakage into the fifth path 65 occurs, the amount is extremely small).

[0066] FIG. 8 is a schematic diagram showing the operation of the detection device 3 after the gas exhaust valve GV is closed.

[0067] When the gas discharge valve GV is closed, the valve element 9 is pressed against the valve seat surface 42b by the pressure of the handled liquid L1 and is fixed in the valve closed position P2. The handled liquid L1 remains in the valve chamber Rv, the groove portion 43g, the small diameter portion 43e, and the second path 62, and closes the one-way valve 7. At this time, the pressure in the second path 62 is higher than atmospheric pressure due to the handled liquid L1 (for example, a pressure close to the discharge pressure (several MPa)), and the indication of the pressure detector 8 rises. As a result, damage to the diaphragm 25 can be detected.

[0068] In this way, since the detection device 3 is provided with the gas exhaust valve GV, the permeating fluid is exhausted to the outside of the housing 4. Therefore, in the detection device 3, even if gas components contained in bubbles generated in the pump chamber R3 pass through the diaphragm 25, the pressure detector 8 does not malfunction. On the other hand, if the diaphragm 25 is damaged, the gas exhaust valve GV quickly closes and the pressure detector 8 detects an increase in pressure due to the passing fluid that has flowed into the second path 62. Therefore, the detection device 3 can detect damage to the diaphragm 25 without delay.

[0069] Summary According to the embodiment described above, the detection device 3 includes the fluid path FP (the first path 61, the second path 62, the small diameter portion 43e, and the groove portion 43g), the pressure detector 8, the gas discharge valve GV, the fifth path 65, and the one-way valve 7. The first path 61 can communicate with the through hole 24a via the connection pipe 28. The pressure detector 8 detects the pressure of the fluid in the second path 62. The gas discharge valve GV includes a valve body 9, a valve chamber Rv, and a valve seat surface 42b. The valve chamber Rv is disposed above the small diameter portion 43e and the groove portion 43g, communicates with the small diameter portion 43e and the groove portion 43g, and accommodates the valve body 9. The valve seat surface 42b is disposed above the valve body 9 and faces the valve body 9. The fifth path 65 opens to the valve seat surface 42b. The one-way valve 7 is attached to the fluid path FP and passes the fluid only from the through hole 24a side (first path 61 side) to the gas exhaust valve GV side (second path 62 side). The valve body 9 is movable between a valve-closed position P2 and a valve-opened position P1. When the diaphragm 25 is not damaged, the valve body 9 is located at the valve-opened position P1. When the valve body 9 is not located at the valve-closed position P2, the valve chamber Rv communicates with the small diameter portion 43e, the groove portion 43g, and the fifth path 65. According to this configuration, even if the permeated fluid flows into the fluid path FP when the diaphragm 25 is not damaged, the permeated fluid flows into the fifth path 65 via the valve chamber Rv and is discharged to the outside of the housing 4. Therefore, in this detection device 3, even if the gas components contained in the bubbles generated in the pump chamber R3 pass through the diaphragm 25, the pressure detector 8 does not malfunction, and the pressure detector 8 does not malfunction by detecting damage to the diaphragm 25 even though the diaphragm 25 is not damaged.

[0070] According to the embodiment described above, the specific gravity of the valve element 9 is smaller than the specific gravity of the handled liquid L1. With this configuration, when the handled liquid L1 flows into the valve chest Rv, the valve element 9 moves to the valve closed position P2 together with the handled liquid L1, and the gas discharge valve GV closes. As a result, the pressure detector 8 detects the increase in pressure of the fluid (handled liquid L1) in the second path 62, and the detection device 3 can appropriately detect damage to the diaphragm 25.

[0071] Furthermore, according to the embodiment described above, the detection device 3 includes a one-way valve 7 disposed between the first path 61 and the second path 62, which allows fluid to pass only from the first path 61 to the second path 62. With this configuration, when the gas exhaust valve GV is closed, the passing fluid is reliably retained within the second path 62 without backflowing from the second path 62 to the first path 61. As a result, the pressure of the fluid within the second path 62 does not increase or decrease significantly, and the indication of the pressure detector 8, once increased, becomes stable without fluctuating greatly. Therefore, the detection device 3 can detect damage to the diaphragm 25 more reliably and stably.

[0072] Furthermore, according to the embodiment described above, the valve element 9 is spherical in shape, and the valve seat surface 42b is a conical surface that is conically recessed toward the fifth path 65. The valve element 9 rises together with the treated fluid L1, and therefore rises while swaying. Therefore, when the valve element 9 abuts against the valve seat surface 42b, the position of the center of the valve element 9 in a downward view may be shifted from the center of the valve seat surface 42b (may be shifted from the valve closing position P2). However, according to this configuration, the valve element 9 is guided by the valve seat surface 42b, and can be finally positioned in a fixed position (valve closing position P2).

[0073] ●Variations● Next, modified examples of the detection device 3 will be described below, focusing on the differences from the previously described embodiment (hereinafter referred to as the "first embodiment"). In the following modified examples, for ease of explanation, the same components as in the first embodiment and components having common functions are given the same reference numerals as in the first embodiment. In the following modified examples, reference will be made as appropriate to Figs. 1 to 8.

[0074] FIG. 9(a) is a schematic diagram showing the arrangement of a detection device 3A according to a modified example in the pump device 1, and (b) is a schematic diagram of the detection device 3A.

[0075] In the present detection device 3A according to the modification, the angle of the housing 4 attached to the diaphragm head 21a and the material of the valve body 9 are different from those in the first embodiment. Specifically, in the present detection device 3A, the housing 4 is attached to the diaphragm head 21a in a state inclined at an angle "θ1° (e.g., 30°)" compared to the housing 4 of the first embodiment. The valve body 9 is made of a material (e.g., SUS440C) having a specific gravity greater than that of the handled liquid L1. The shapes of the large diameter portion 43d and the valve body 9 (the cross-sectional area "A" of the gap S) are designed so that the flow velocity of the handled liquid L1 flowing in the gap S between the valve body 9 and the large diameter portion 43d is (sufficiently) greater than the terminal velocity of the valve body 9 with respect to the handled liquid L1 and the working fluid L2. Therefore, even if the valve element 9 is made of a material having a specific gravity greater than that of the handled liquid L1, when the diaphragm sheets 25a, 25b are damaged, the valve element 9 moves to the valve closing position P2 and blocks the fifth path 65. Therefore, the detection device 3A can detect damage to the diaphragm 25.

[0076] The second path 62, the through hole 43c (the large diameter portion 43d and the small diameter portion 43e), and the fifth path 65 extend along a direction inclined by "θ1°" from the vertical direction. That is, the movement direction of the valve body 9 in the valve chamber Rv is inclined by approximately "θ1°" from the vertical direction and is inclined by approximately "90°-θ1°" from the horizontal direction. That is, the inner peripheral surface of the valve chamber Rv (the large diameter portion 43d) is an inclined surface. The valve seat surface 42b is disposed obliquely above the valve body 9, that is, above the valve body 9. In this configuration, the gravity acting on the valve body 9 is resolved by the inclined surface, and when a force equal to or greater than the component force of gravity along the inclined surface is applied to the valve body 9, the valve body 9 rolls up the inclined surface. Therefore, the flow rate of the handled fluid L1 required to move the valve disc 9 to the valve closed position P2 is smaller (reduced) than the same flow rate when the valve chamber Rv extends in the vertical direction (when the movement direction of the valve disc 9 is along the vertical direction). In other words, when the specific gravity of the valve disc 9 is greater than the specific gravity of the handled fluid L1, the valve disc 9 in the valve chamber Rv of this modified example moves more easily than the valve disc 9 in the valve chamber Rv of the first embodiment.

[0077] In the modified example, the valve element 9 only needs to be located at the valve open position P1 by its own weight when the diaphragm 25 is not damaged, and the angle "θ1°" is not limited to "30°." The angle "θ1°" can be set from 1° to 89°, but is preferably an angle (e.g., about 30° to 60°) that allows the valve element 9 to move smoothly between the valve open position P1 and the valve closed position P2.

[0078] In a modified example, only the valve chamber Rv (through hole 43c) may extend at an angle relative to the vertical direction. In this case, the configuration of the housing 4 excluding the valve chamber Rv is the same as that of the first embodiment.

[0079] Furthermore, in the modified example, the orientation and shape of the valve seat surface 42b may be the same as those in the first embodiment. That is, the valve seat surface 42b may be a conical surface that is conically recessed upward, rather than obliquely upward.

[0080] ●Other embodiments● In the present invention, the valve body 9 is not limited to being made of PP. That is, for example, the valve body 9 may be made of a synthetic resin such as PE (polyethylene) having a specific gravity of less than 1, or may be made of a synthetic resin such as PTFE having a specific gravity of more than 1. Also, for example, in an environment in which the valve body 9 is easily deformed (such as an environment in which the temperature and / or discharge pressure of the handled liquid L1 is high), the valve body 9 may be made of a material (such as a metal) having higher strength and heat resistance than synthetic resin.

[0081] In the present invention, the shape of the valve element 9 is not limited to a spherical shape as long as it corresponds to the shape of the valve seat surface 42b for the valve element 9. That is, for example, the shape of the valve element 9 may be a cone shape. When the shape of the valve seat surface 42b is flat, the shape of the valve element 9 may be a disk shape, or a shape in which a shaft portion that can be inserted into the fifth passage 65 protrudes from the center of the disk (an inverted T shape in a side view).

[0082] Furthermore, in the present invention, the principle used for moving the valve element 9 is not limited to the specific gravity difference or the terminal velocity. That is, for example, the valve element 9 may move by utilizing the difference in resistance (throttle resistance) of the fluid flowing into the thin tube. Specifically, the valve element 9 has a fine hole (through hole) that is exposed to the valve chamber Rv when the valve element 9 is located at the valve open position P1, thereby communicating the valve chamber Rv with the fifth path 65, and is not exposed to the valve chamber Rv when the valve element 9 is located at the valve closed position P2. In general, the throttling resistance of a liquid is greater than the throttling resistance of a gas. Therefore, when a permeating fluid flows into the valve chamber Rv, the permeating fluid flows relatively easily into the through hole, and the valve element 9 does not move to the valve closed position P2. On the other hand, when a passing fluid flows into the valve chamber Rv, the passing fluid cannot easily flow into the through hole due to the throttling resistance of the through hole, and the valve element 9 is pushed to the valve closed position P2 by the passing fluid filled in the valve chamber Rv.

[0083] Furthermore, in the present invention, the valve body 9 may be hollow. In this case, even if the valve body 9 is made of a material having a specific gravity greater than that of the handled liquid L1, the buoyancy of the valve body 9 increases. Therefore, the apparent specific gravity of the valve body 9 can be made smaller than that of the handled liquid L1.

[0084] Furthermore, in the present invention, the shape of the through hole 43c is not limited to the shape in the first embodiment as long as the permeated fluid can flow into the valve chamber Rv and the fifth path 65 when the valve body 9 is in the valve open position P1. That is, for example, the through hole 43c may have a plurality of through holes that open into the bottom of the large diameter portion 43d, instead of the small diameter portion 43e and the groove portion 43g.

[0085] Furthermore, in the present invention, the configuration of the housing 4 is not limited to that of the first embodiment. That is, for example, the third housing 43 may be formed integrally with the first housing 41. Also, for example, only the gas exhaust valve GV may be unitized, and the unit may be attached inside or outside the housing 4. Furthermore, a recess that can accommodate and clamp the third housing 43 may be formed on the upper surface 41a of the first housing 41 and / or the lower surface 42a of the second housing 42.

[0086] Furthermore, in the present invention, the reciprocating pump 2 does not necessarily have to include the tubular connecting pipe 28. In this case, for example, the connecting part 5 of the present detection device 3 may be attached to the diaphragm head 21a, and the connecting part 5 may communicate with the through hole 24a. In this case, the connecting part 5 is an example of the connecting pipe in the present invention.

[0087] Furthermore, in the present invention, the fifth passage 65 may be provided with a device for collecting or neutralizing the gas components discharged from the gas discharge valve GV.

[0088] ●Embodiments of the present invention● Next, the embodiments of the present invention that can be understood from the above-described embodiments will be described below, using the terms and symbols described in the respective embodiments.

[0089] A first embodiment of the present invention is a diaphragm breakage detection device (e.g., diaphragm breakage detection device 3, 3A) that is attached to a reciprocating pump (e.g., reciprocating pump 2) that sucks and discharges a handled liquid (e.g., handled liquid L1) by the reciprocating motion of a diaphragm (e.g., diaphragm 25) formed by closely contacting two diaphragm sheets (e.g., diaphragm sheets 25a, 25b) and detects breakage of the diaphragm. The reciprocating pump is The diaphragm breakage detection device includes a peripheral ring (e.g., peripheral ring 24) arranged between the outer edge portions (e.g., outer edge portions 25c, 25d) of the two diaphragm sheets, and ... the diaphragm breakage detection device includes a fluid path (e.g., fluid path FP) that can communicate with a through hole (e.g., through hole 24a) that penetrates the peripheral ring in the radial direction of the peripheral ring, a pressure detector (e.g., pressure detector 8) that detects the pressure in the fluid path, and a pressure detector (e.g., pressure detector 9) that is arranged above the fluid path and detects the pressure in the fluid path. a gas exhaust valve (e.g., gas exhaust valve GV) connected to a fluid path, a discharge path (e.g., fifth path 65) connected to the gas exhaust valve, and a one-way valve (e.g., one-way valve 7) attached to the fluid path and allowing fluid to pass only from the through hole side to the gas exhaust valve side, the gas exhaust valve including a valve body (e.g., valve body 9), a valve chamber (e.g., valve chamber Rv) communicating with the fluid path and accommodating the valve body, a valve seat surface (e.g., valve seat surface 42b) disposed above the valve body and facing the valve body, the discharge path opens to the valve seat surface, the valve body is movable between a closed position (e.g., closed valve position P2) in which the valve body abuts against the valve seat surface and covers the discharge path, and an open position (e.g., open valve position P1) in which the valve body moves away from the valve seat surface and does not cover the discharge path, and when the diaphragm is not damaged, the diaphragm is located in the open position, and when the valve body is not located in the closed position, the valve chamber communicates with the fluid path and the discharge path. According to this configuration, there is no risk of the malfunction of detecting damage to the diaphragm when the diaphragm is not actually damaged.

[0090] A second embodiment of the present invention is a diaphragm breakage detection device (for example, diaphragm breakage detection device 3) in which, in the first embodiment, the specific gravity of the valve body is smaller than the specific gravity of the handled liquid. According to this configuration, the detection device can appropriately detect damage to the diaphragm.

[0091] A third embodiment of the present invention is a diaphragm breakage detection device (e.g., diaphragm breakage detection device 3A) in which, in the first embodiment, the specific gravity of the valve body is greater than the specific gravity of the handled liquid, and the valve chamber and the valve body are formed so that when the handled liquid that has passed through the diaphragm flows into the valve chamber, the flow velocity of the handled liquid in the valve chamber is greater than the terminal velocity of the valve body relative to the handled liquid. According to this configuration, the valve body can be made of a material having high strength and heat resistance.

[0092] A fourth embodiment of the present invention is a diaphragm breakage detection device according to the third embodiment, wherein the movement direction of the valve body is inclined with respect to the vertical direction and the horizontal direction. With this configuration, the flow rate required to move the valve disc is reduced.

[0093] A fifth embodiment of the present invention is a diaphragm breakage detection device, in any one of the first to fourth embodiments, wherein the valve body has a spherical shape and the valve seat surface is an inverted conical surface that is conically concave toward the discharge path. According to this configuration, the valve disc is guided by the valve seat surface and can ultimately be positioned in a home position (valve closed position).

[0094] A sixth embodiment of the present invention is a reciprocating pump device (e.g., reciprocating pump device 1) including a diaphragm (e.g., diaphragm 25) formed by tightly contacting two diaphragm sheets (e.g., diaphragm sheets 25a, 25b), a circular peripheral ring (e.g., peripheral ring 24) arranged between the outer edge portions (e.g., outer edge portions 25c, 25d) of the two diaphragm sheets, and a connecting pipe (e.g., connecting pipe 28) connected to a through hole (e.g., through hole 24a) that penetrates the peripheral ring in the radial direction of the peripheral ring, and a diaphragm breakage detection device (e.g., diaphragm breakage detection device 3, 3A) described in the first embodiment that is attached to the reciprocating pump and detects breakage of the diaphragm. According to this configuration, there is no risk of the malfunction of detecting damage to the diaphragm when the diaphragm is not actually damaged. [Explanation of symbols]

[0095] 1 Reciprocating pump device 2 Reciprocating Pump 3 Diaphragm damage detection device 42b Valve seat surface 43e Small diameter section (second fluid path) 43g Groove (second fluid path) 61 first flow path (first fluid path) 62 second flow path (second fluid path) 65 5th flow path (exhaust route) 7 One-way valve 8. Pressure detector 9 Valve body FP Fluid Path GV Gas Exhaust Valve P1 Valve open position P2 Valve closed position

Claims

1. A diaphragm breakage detection device is attached to a reciprocating pump that sucks and discharges pumped fluid by the reciprocating motion of a diaphragm formed by two diaphragm sheets being in close contact with each other, and detects breakage of the diaphragm, The reciprocating pump comprises: The diaphragm; an annular peripheral ring disposed between the outer edges of the two diaphragm sheets; With The diaphragm breakage detection device includes: a fluid path that can communicate with a through hole that penetrates the peripheral ring in a radial direction of the peripheral ring; a pressure detector for detecting a pressure in the fluid path; a gas exhaust valve disposed above the fluid path and connected to the fluid path; an exhaust path connected to the gas exhaust valve; a one-way valve attached to the fluid path and allowing fluid to pass only from the through hole side to the gas exhaust valve side; and The gas exhaust valve is A valve body, a valve chamber communicating with the fluid path and accommodating the valve body; a valve seat surface disposed above the valve body and facing the valve body; With The discharge path opens to the valve seat surface, The valve body is the valve body is movable between a closed position in which the valve body abuts against the valve seat surface to cover the discharge path and an open position in which the valve body is separated from the valve seat surface to not cover the discharge path, When the diaphragm is not damaged, the diaphragm is in the open position, The valve chamber communicates with the fluid path and the discharge path when the valve element is not in the valve closing position. Diaphragm rupture detection device.

2. The specific gravity of the valve body is smaller than the specific gravity of the handled fluid.

2. The diaphragm rupture detection device according to claim 1.

3. The specific gravity of the valve body is greater than the specific gravity of the handled fluid, the valve chamber and the valve element are formed such that, when the pumped fluid that has passed through the diaphragm flows into the valve chamber, the flow velocity of the pumped fluid in the valve chamber is greater than the terminal velocity of the valve element relative to the pumped fluid.

2. The diaphragm rupture detection device according to claim 1.

4. The movement direction of the valve body is inclined with respect to the vertical direction and the horizontal direction.

4. The diaphragm breakage detection device according to claim 3.

5. The valve body has a spherical shape, The valve seat surface is an inverted conical surface that is conically concave toward the discharge path. The diaphragm breakage detection device according to any one of claims 1 to 4.

6. a diaphragm formed by closely contacting two diaphragm sheets; an annular peripheral ring disposed between the outer edges of the two diaphragm sheets; a connecting pipe connected to a through hole passing through the peripheral ring in a radial direction of the peripheral ring; A reciprocating pump comprising: a diaphragm breakage detection device according to claim 1 , which is attached to the reciprocating pump and detects breakage of the diaphragm; It is made of Reciprocating pump device.

Images