Diaphragm breakage detection device and reciprocating pump device

Abstract

A diaphragm breakage detection device and a reciprocating pump device are provided, which do not cause malfunction even if gas components contained in bubbles generated in the pump chamber pass through the diaphragm. The diaphragm failure detection device (3) according to the present invention detects failure of the diaphragm (25) of a reciprocating pump (2). The diaphragm failure detection device comprises a fluid path (FP) that is in communication with a through hole (24a) of a main ring (24), a pressure detector (8) that detects pressure within 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) that accommodates the valve body, and a valve seat surface (42b) positioned above the valve body. The discharge path is open to the valve seat surface. The valve body is movable between a valve closed position (P2) and a valve open position (P1) and is located in the valve open position when the diaphragm is not broken. The valve chamber communicates with the fluid path and the discharge path when the valve body is not located in the valve closed position.

Description

Technology Field

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

[0002] A reciprocating pump sucks in and discharges a handling fluid by reciprocating a membrane-type diaphragm. The diaphragm is housed in the housing of the reciprocating pump, dividing the space within the housing (diaphragm chamber) 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 positioned to face the diaphragm. As the plunger reciprocates, the diaphragm reciprocates. As a result, the volume of the pump chamber changes, causing the handling fluid to be sucked into the pump chamber and discharged from the pump chamber. In a reciprocating pump configured in this manner, if the diaphragm breaks, not only is the performance of the reciprocating pump degraded, but the working fluid may also be mixed into the handling fluid. Therefore, a reciprocating pump is known in which a diaphragm breakage detection device (hereinafter simply referred to as the "detection device") is installed to detect diaphragm breakage within the reciprocating pump (e.g., see Patent Document 1).

[0003] In the reciprocating pump disclosed in Patent Document 1, a diaphragm is formed by two diaphragm seats being in close contact. A ring-shaped ring is mounted between the outer edges of each of the two diaphragm seats. The ring is provided with a through hole that penetrates the ring in the radial direction. A pipe connected to a pressure gauge is connected to the through hole. In this configuration, if one of the two diaphragm seats is damaged due to some factor during the operation of the reciprocating pump, the working fluid or handling fluid flows between the two diaphragm seats 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 through the incoming liquid, and the damage to the diaphragm is detected by the rise in the pressure gauge's reading. Prior art literature

[0004] Japanese Published Patent No. Heisei 11-132149 The problem to be solved

[0005] Generally, diaphragms are made of synthetic resins, such as rubber or fluoropolymer. When these synthetic resins are thinned into thin films, they possess fine pores (gaps) that allow gases to pass through, although liquids cannot. In other words, thinned synthetic resin diaphragms have a certain degree of gas permeability. Consequently, when a handling liquid prone to generating bubbles due to pressure fluctuations within the pump room (e.g., a handling liquid containing a large amount of dissolved gas, a handling liquid that is prone to vaporization, etc.) is delivered, the bubbles generated within the pump room can pass through the diaphragm. As a result, the gas components constituting the bubbles remain within the detection device, causing a malfunction where the pressure gauge reading rises even though the diaphragm has not been damaged.

[0006] The present invention aims to provide a diaphragm breakage detection device and a reciprocating pump device that do not cause malfunction even when gas components in the pump chamber pass through the diaphragm. means of solving the problem

[0007] A diaphragm failure detection device in one embodiment of the present invention is a diaphragm failure detection device mounted on a reciprocating pump that sucks in and discharges a handling fluid by the reciprocating motion of a diaphragm formed by the close contact of two diaphragm seats, and detects failure of said diaphragm, wherein the reciprocating pump has an annular peripheral ring disposed between the outer edge of each of the diaphragm and the two diaphragm seats, and the diaphragm failure detection device comprises a fluid path capable of communicating with a through hole penetrating the peripheral ring in the radial direction of the peripheral ring, a pressure detector for detecting pressure within the fluid path, a gas discharge valve disposed above the fluid path and connected to the fluid path, a discharge path connected to the gas discharge valve, and a unidirectional valve mounted on the fluid path that allows fluid to pass only from the side of the through hole to the side of the gas discharge valve, wherein the gas discharge valve has a valve body, a valve chamber communicating with the fluid path and accommodating the valve body, and a valve seat surface disposed above the valve body and facing the valve body, and the discharge path is the The valve body is open to the valve seat surface, and the valve body is movable between a valve closed position in which the valve body contacts the valve seat surface and covers the discharge path, and a valve open position in which the valve body is spaced apart from the valve seat surface and does not cover the discharge path, and is located in the valve open position when the diaphragm is not damaged, and the valve chamber communicates with the fluid path and the discharge path when the valve body is not located in the valve closed position.

[0008] A reciprocating pump device in one embodiment of the present invention comprises a reciprocating pump having a flexible diaphragm formed by two diaphragm sheets being in close contact, an annular peripheral ring disposed between the outer edges of each of the two diaphragm sheets, and a connecting pipe connected to a through hole penetrating the peripheral ring in the radial direction of the peripheral ring, and a diaphragm damage detection device according to the aforementioned embodiment that is mounted on the reciprocating pump and detects damage to the diaphragm. Effects of the invention

[0009] According to the present invention, a diaphragm breakage detection device and a reciprocating pump device can be provided that do not cause malfunction even if gas components in the pump chamber pass through the diaphragm. Brief explanation of the drawing

[0010] FIG. 1 is a schematic diagram showing an embodiment of a reciprocating pump device according to the present invention. FIG. 2 is a schematic diagram of a partially enlarged cross-sectional view of the main ring and diaphragm equipped with the reciprocating pump device of FIG. 1. FIG. 3 is a schematic diagram of a diaphragm breakage detection device equipped with the reciprocating pump device of FIG. 1. FIG. 4 is a schematic diagram of a partially enlarged cross-sectional view of the housing equipped with the diaphragm breakage detection device of FIG. 3. FIG. 5 is a schematic diagram of a partially enlarged cross-sectional view of a gas discharge valve equipped with the diaphragm breakage detection device of FIG. 3. Figure 6 is a schematic diagram showing the operation of the diaphragm breakage detection device of Figure 3 when the diaphragm of Figure 2 is not broken. FIG. 7 is a schematic diagram showing the operation of the diaphragm breakage detection device of FIG. 3 when the diaphragm of FIG. 2 is broken. FIG. 8 is a schematic diagram showing the operation of the diaphragm breakage detection device of FIG. 3 after the gas discharge valve of FIG. 5 is closed. (a) of FIG. 9 is a schematic diagram showing the arrangement of the diaphragm failure detection device of FIG. 3 according to a modified example in the reciprocating pump device of FIG. 1, and (b) is a schematic diagram of the diaphragm failure detection device. Specific details for implementing the invention

[0011] Hereinafter, embodiments of a diaphragm breakage detection device (hereinafter referred to as the "detection device") and a reciprocating pump device (hereinafter referred to as the "pump device") according to the present invention will be described. In the following description, reference should be made to the drawings. In each drawing, the same reference numerals are assigned to identical members and elements, and redundant descriptions are omitted. Furthermore, the dimensional ratios of each element may be exaggerated for convenience of explanation and are not limited to the ratios shown in each drawing.

[0012] ●Reciprocating Pump System●

[0013] ● Configuration of a reciprocating pump system

[0014] FIG. 1 is a schematic diagram showing an embodiment of the pump device.

[0015] The pump device (1) sucks in and discharges the handling liquid (L1). The pump device (1) is equipped with a reciprocating pump (2) and a detection device (3).

[0016] 'Handling liquid (L1)' is a liquid transferred by the pump device (1). In this embodiment, the handling liquid (L1) is, for example, water.

[0017] In addition, in the present invention, the handling liquid (L1) is not limited to water. That is, for example, the handling liquid (L1) may be a liquid with a specific gravity greater than '1' (e.g., sulfuric acid, etc.), a liquid with a specific gravity less than '1' (e.g., fuel oil, etc.), a liquid that is easy to vaporize (e.g., liquefied gas, etc.), or a liquid containing a large amount of dissolved gas (e.g., a liquid pressurized by gas, etc.).

[0018] The configuration of the reciprocating pump (2) is common to that of a known reciprocating pump (diaphragm pump) that sucks in and discharges a handling liquid by the reciprocating motion of a diaphragm. Therefore, in the following description, only a general overview of the configuration of the reciprocating pump (2) is described, and a detailed description is omitted. The reciprocating pump (2) is equipped with a housing (21), a suction pipe (22), a discharge pipe (23), a main ring (24), a diaphragm (25), a plunger (26), a driving device (27), and a connecting pipe (28).

[0019] The housing (21) accommodates the plunger (26) and the driving device (27). A portion of the housing (21) forms a diaphragm head (21a) that encloses the main ring (24) and partitions the diaphragm chamber (R1) that accommodates the central portion (252) (reciprocating portion) of the diaphragm (25) described later.

[0020] The suction pipe (22) is connected to the diaphragm head (21a) and functions as a path for the handling liquid (L1) sucked into the diaphragm chamber (R1) (the pump chamber (R3) described later).

[0021] The discharge pipe (23) is connected to the diaphragm head (21a) and functions as a path for the handling fluid (L1) discharged from the diaphragm chamber (R1) (the pump chamber (R3) described later).

[0022] The main ring (24) holds the diaphragm (25). The shape of the main ring (24) is a ring plate shape (i.e., annular). The main ring (24) has at least one through hole (24a). In the radial direction of the main ring (24), the through hole (24a) is a hole that penetrates from the inner circumference of the main ring (24) to the outer circumference.

[0023] FIG. 2 is a schematic diagram of a partially enlarged cross-section of the main ring (24) and diaphragm (25).

[0024] Refer appropriately to Figure 1 in the following description.

[0025] The diaphragm (25) reciprocates to draw in the handling liquid (L1) into the pump chamber (R3) described later, and discharges the handling liquid (L1) from the pump chamber (R3). The outer edge (251) of the diaphragm (25) is mounted on the main ring (24) while the central part (252) of the diaphragm (25) has a predetermined tension. Specifically, the diaphragm (25) is formed by two circular membrane-shaped diaphragm sheets (25a, 25b) overlapping and adhering to each other. The diaphragm sheets (25a, 25b) are made of synthetic resin, such as, for example, PTFE (polytetrafluoroethylene). The outer edge (25c) of the diaphragm sheet (25a) is spaced apart from the outer edge (25d) of the diaphragm sheet (25b), and a peripheral ring (24) is disposed between the outer edges (25c, 25d). The outer edge (25c) is mounted to the peripheral ring (24) while the central part (25e) of the diaphragm sheet (25a) has a predetermined tension, and the outer edge (25d) is mounted to the peripheral ring (24) while the central part (25f) of the diaphragm sheet (25b) has a predetermined tension. The central part (25e) of the diaphragm sheet (25a) is in close contact with the central part (25f) of the diaphragm sheet (25b). The outer edge portion (25c, 25d) constitutes the outer edge portion (251), and the central portion (25e, 25f) constitutes the central portion (252).

[0026] As described above, the main ring (24) is clamped in the diaphragm head (21a). The central portion (252) of the diaphragm (25) is positioned in the diaphragm chamber (R1) and divides the diaphragm chamber (R1) into a fluid pressure chamber (R2) (the space facing the diaphragm seat (25b)) and a pump chamber (R3) (the 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 handling fluid (L1) during the operation of the pump device (1). 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 'rear direction' is the direction in which the fluid pressure chamber (R2) is located relative to the diaphragm (25).

[0027] In the following description, reference is mainly made to Fig. 1.

[0028] The plunger (26) reciprocates the central portion (252) of the diaphragm (25) through the working fluid (L2) by reciprocating. The plunger (26) is positioned at the rear of the diaphragm (25) so as to face the central portion (252) of the diaphragm (25) so as to reciprocate with respect to the fluid pressure chamber (R2).

[0029] The driving device (27) reciprocates the plunger (26). The driving device (27) is equipped with, for example, a motor (not shown) and a transmission mechanism (not shown) that transmits the power of the motor to the plunger (26).

[0030] The connecting pipe (28) is a pipe body that connects the through hole (24a) of the main ring (24) with the fluid path (FP) described later. One end of the connecting pipe (28) is connected to the through hole (24a).

[0031] In addition, in the present invention, the connecting pipe (28) is configured to communicate the through hole (24a) and the fluid path (FP), and is not limited to a tubular body. That is, for example, the connecting pipe (28) may be a tubular joint.

[0032] The detection device (3) detects damage to the diaphragm (25). The detection device (3) is mounted on the diaphragm head (21a) of the reciprocating pump (2). The specific configuration of the detection device (3) will be described later.

[0033] ● Diaphragm Breakage Detection Device ●

[0034] ● Configuration of the diaphragm breakage detection device

[0035] Figure 3 is a schematic diagram of the detection device (3).

[0036] For convenience of explanation, the drawing schematically shows the configuration of a part of the reciprocating pump (2). Refer to Figure 3 appropriately in the description of the detection device (3) below.

[0037] The detection device (3) comprises a housing (4), a connecting part (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 detection device (3) is common to the configuration of a conventional diaphragm failure detection device (hereinafter referred to as the 'conventional detection device'), except that the detection device (3) is equipped with a gas discharge valve (GV) described later.

[0038] FIG. 4 is a schematic diagram of a partially enlarged cross-section of the housing (4).

[0039] The drawing shows an enlarged view of the vicinity of the gas discharge valve (GV). The drawing shows the valve body (9) in a cross-sectional view.

[0040] The housing (4) contains an internal path (6) and also functions as a housing for a gas discharge valve (GV). The housing (4) is made of metal, for example, stainless steel. The housing (4) is mounted, for example, on a diaphragm head (21a) so that the second path (62), the through hole (43c), and the fifth path (65) (their axial directions) described later extend in the vertical direction. In the front-rear direction, the housing (4) is positioned, for example, behind the through hole (24a). The housing (4) comprises a first housing (41), a second housing (42), and a third housing (43).

[0041] The first housing (41) contains the first path (61), second path (62), third path (63), and fourth path (64) described later. The shape of the first housing (41) is, for example, a cylinder shape.

[0042] The second housing (42) contains the fifth path (65), which will be described later, inside. The shape of the second housing (42) is, for example, a cylinder shape. The central part of the lower surface (42a) of the second housing (42) is a conical surface (i.e., an inverted conical surface) that is conically concave toward the top and functions as a valve seat surface (42b), which will be described later. The second housing (42) is positioned above the first housing (41) and is mounted to the first housing (41) by means of a bolt (not shown).

[0043] The third housing (43) contains the second path (62) and valve chamber (Rv), which will be described later, inside. The shape of the third housing (43) is, for example, a flattened cylinder shape in the vertical direction. A through hole (43c) is provided in the third housing (43) and is opened in the center of the upper surface (43a) and lower surface (43b) of the third housing (43). The through hole (43c) is provided with a large diameter portion (43d), a small diameter portion (43e), an end portion (43f), and a plurality of groove portions (43g). The shape of the large diameter portion (43d) is a cylinder shape, and the shape of the small diameter portion (43e) is approximately a cylinder 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 positioned above the small diameter portion (43e) and adjacent to the small diameter portion (43e). The end portion (43f) is formed by the ring-shaped bottom portion of the large diameter portion (43d). A portion of the circumferential surface of the small diameter portion (43e) forms a concave groove (43g) extending from the top to the bottom of the small diameter portion (43e) toward the radial outer side of the small diameter portion (43e). The small diameter portion (43e) and the groove (43g) function as part of the fluid path (FP) described later.

[0044] The third housing (43) is positioned between the upper surface (41a) of the first housing (41) and the lower surface (42a) of the second housing (42) and is clamped by the first housing (41) and the second housing (42). At this time, the valve seat surface (42b) is positioned 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) partition a roughly cylindrical space (hereinafter referred to as the 'valve chamber (Rv)') inside the housing (4). Additionally, the first housing (41) to the third housing (43) can be easily disassembled simply by removing the bolts. Sealing members (not shown), such as O-rings or gaskets, are appropriately placed between the first housing (41) and the third housing (43) and between the second housing (42) and the third housing (43).

[0045] The connecting part (5) is, for example, a known tubular joint to which the connecting pipe (28) is connected. The connecting part (5) is mounted in the housing (4) (first housing (41)) to communicate with the internal path (6) (first path (61) described later). The other end of the connecting pipe (28) is connected to the connecting part (5), and the connecting pipe (28) communicates with the internal path (6) through the connecting part (5).

[0046] The internal path (6) is disposed (formed) inside the housing (4) (first housing (41)) and is a path through which fluid (hereinafter referred to as 'inflow fluid') that has entered (infiltrated) the through hole (24a) from the diaphragm (25) flows. That is, the housing (4) contains the internal path (6) inside. The internal path (6) has a first path (61), a second path (62), a third path (63), a fourth path (64), and a fifth path (65).

[0047] The ‘inflow fluid’ is a fluid that passes through or permeates the diaphragm (25), penetrates the through hole (24a), and enters (intrudes) into the internal path (6) through the connecting pipe (28) and the connecting part (5). The fluid passing through the diaphragm (25) (hereinafter referred to as the ‘passing fluid’) is, for example, a handling fluid (L1) and / or operating fluid (L2) that passes through the diaphragm sheets (25a, 25b) and enters (intrudes) between the diaphragm sheets (25a, 25b) from the damaged part (X) (see FIG. 7; hereinafter the same) when the diaphragm sheets (25a, 25b) (diaphragm (25)) are damaged. The fluid that passes through the diaphragm (25) (hereinafter referred to as "passed fluid") is, for example, a bubble formed based on a gas component (dissolved gas) dissolved in the handling liquid (L1), a bubble contained in the handling liquid (L1), and / or a bubble formed by the vaporization of the handling liquid (L1). As described above, since the diaphragm sheet (25a, 25b) (diaphragm (25)) is made of synthetic resin, the liquid (handling liquid (L1), working fluid (L2)) does not pass through the diaphragm (25), but some gas (dissolved gas, etc.) can pass through the diaphragm (25). In the following description, "upstream side" is the upstream side in the flow within the internal path (6) of the incoming fluid, and "downstream side" is the downstream side in the flow within the internal path (6) of the incoming fluid.

[0048] The first path (61) and the second path (62) are paths through which an incoming fluid flows between the connection part (5) and the gas discharge valve (GV). The first path (61) is positioned inside the first housing (41) so as to extend in series (e.g., in a vertical direction (horizontal direction)) with respect to the second path (62). 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) communicates with the connection pipe (28) through the connection part (5) and can communicate with the second path (62) through the one-way valve (7). The second path (62) is positioned inside the first housing (41) along the vertical 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) is opened in the center of the upper surface (41a) of the first housing (41) and communicates with the small diameter portion (43e) and the groove portion (43g) of the third housing (43) positioned above the downstream end (62b). Thus, the downstream end (62b) of the second path (62) is positioned above the upstream end (62a) of the second path (62), and the small diameter portion (43e) and the groove portion (43g) are positioned above 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 flows the inflow fluid from the connecting pipe (28) to the gas discharge valve (GV).

[0049] The third path (63) is a drain path used when fluid (mainly passing fluid) introduced into the second path (62) is discharged to the outside of the housing (4). The third path (63) is positioned inside the first housing (41). The upstream end (63a) of the third path (63) is connected to the second path (62), and the downstream end (63b) of the third path (63) is opened on the outer surface of the housing (4) (the first housing (41)).

[0050] 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 within the second path (62). The fourth path (64) is placed inside the first housing (41).

[0051] The fifth path (65) is a path through which permeable fluid introduced into the fluid path (FP) passes when being discharged to the outside of the housing (4). The fifth path (65) is positioned inside the second housing (42) to follow the vertical direction. The upstream end (65a) of the fifth path (65) is opened at the center of the valve seat surface (42b), and the downstream end (65b) of the fifth path (65) is opened on the outer surface of the housing (4) (second housing (42)). The fifth path (65) is an example of a discharge path in the present invention.

[0052] The one-way valve (7) is a known check valve positioned between the first path (61) and the second path (62) and configured to allow fluid to pass only from the first path (61) to the second path (62). In other words, the one-way valve (7) is mounted in the fluid path (FP) and configured to allow fluid to pass only from the through hole (24a) side to the gas discharge valve (GV) side.

[0053] 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.

[0054] In addition, in the present invention, the pressure detector (8) is capable of detecting pressure within the second path (62) and is not limited to a pressure gauge. That is, for example, the pressure detector (8) may be a known pressure switch or a pressure sensor.

[0055] The valve body (9) functions as the valve body of the gas discharge valve (GV) and moves between the valve opening position (P1) and the valve closing position (P2), which will be described later, based on the flow of the passing fluid. As described later, the material of the valve body (9) is determined based on the difference in specific gravity with the handling fluid (L1) and / or the terminal velocity (also called terminal settling velocity or terminal velocity) with respect to the handling fluid (L1) (working fluid (L2)), and in this embodiment, it is made of polypropylene (PP). The shape of the valve body (9) is determined in correspondence with the shape of the valve seat surface (42b) for the valve body (9), and in this embodiment, it is spherical. The valve body (9) is housed in the valve chamber (Rv). The diameter of the valve body (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 body (9) and the large diameter part (43d) in the horizontal direction.

[0056] The drain valve (10) is a drain valve used to discharge fluid (mainly passing fluid) that has entered the second path (62) to the outside of the housing (4). The drain valve (10) is installed in the third path (63).

[0057] ● Composition of the gas discharge valve

[0058] Figure 5 is a schematic diagram of a partially enlarged cross-sectional view of a gas discharge valve (GV).

[0059] The drawing shows the valve body (9) in a cross-sectional view. For convenience of explanation, the drawing shows the valve body (9) and the second path (62) when the valve is in the closed position (P2) as a dotted line. For convenience of explanation, the drawing shows the valve open position (P1) and the valve closed position (P2) as the center positions of the valve body (9).

[0060] The gas discharge valve (GV) is a valve that discharges permeable fluid flowing into the second path (62) to the outside of the housing (4) and stops permeable fluid flowing into the second path (62) inside the housing (4). That is, the gas discharge valve (GV) functions as a valve that discharges gas from the fifth path (65) and does not discharge liquid from the fifth path (65). The gas discharge 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 discharge valve (GV) has a valve seat surface (42b), a valve chamber (Rv), and a valve body (9). The gas discharge valve (GV) is positioned 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 housed in the valve chamber (Rv). In the vertical direction, the valve seat surface (42b) is positioned above the valve body (9) and facing the valve body (9). Within the valve chamber (Rv), the valve body (9) is movable between the valve open position (P1) and the valve closed position (P2). The valve body (9) moves along the valve chamber (Rv) (large diameter portion (43d)). Accordingly, the direction of movement follows the axial direction (vertical direction) of the large diameter portion (43d).

[0061] The 'valve open position (P1)' is a position where the valve body (9) does not cover (do not close) the fifth path (65) from below. In the present invention, the valve open position (P1) is the lowest position within the range of movement of the valve body (9) within the valve chamber (Rv). In other words, the valve open position (P1) is the position where the valve body (9) is furthest from the valve seat surface (42b) within the valve chamber (Rv). When the valve body (9) is in the valve open position (P1), the valve body (9) touches the end portion (43f), the upper portion of the small diameter portion (43e) is closed by the valve body (9), and the upper portion of the groove portion (43g) is not closed by the valve body (9). Thus, the valve chamber (Rv) is connected to the second path (62) through the groove portion (43g). Also, the valve body (9) does not come into contact with the valve seat surface (42b), and the fifth path (65) is not closed to the valve body (9). Therefore, the valve chamber (Rv) communicates with the fifth path (65). Here, when the valve body (9) is positioned at the valve opening position (P1), the shortest distance between the valve body (9) and the valve seat surface (42b) in the vertical direction (i.e., the movable distance of the valve body (9)) is set to a small length, for example, about 10 to 20 percent of the diameter of the valve body (9).

[0062] The 'valve closing position (P2)' is a position where the valve body (9) covers (closes) the fifth path (65) from below. In the present invention, the valve closing position (P2) is the highest position within the range of movement of the valve body (9) within the valve chamber (Rv) where the valve body (9) touches the valve seat surface (42b). That is, in the vertical direction, the valve closing position (P2) is located above (directly above in this embodiment) the valve opening position (P1).

[0063] When the specific gravity of the valve body (9) is less than the specific gravity of the handling liquid (L1), the valve body (9) floats on the handling liquid (L1). Therefore, when the handling liquid (L1) flows into the valve chamber (Rv), the valve body (9) moves together with the handling liquid (L1) from the valve open position (P1) to the valve closed position (P2), covering (closing) the fifth path (65). At this time, the gas discharge valve (GV) is closed. In this embodiment, the handling liquid (L1) is water, and the valve body (9) is made of PP. That is, the specific gravity of the valve body (9) is less than the specific gravity of the handling liquid (L1), and the valve body (9) moves within the valve chamber (Rv) together with the handling liquid (L1).

[0064] Meanwhile, when the specific gravity of the valve body (9) is greater than the specific gravity of the handling liquid (L1), the valve body (9) does not float on the handling liquid (L1). Even in this case, if the flow velocity of the handling liquid (L1) flowing through the valve chamber (Rv), particularly the gap (S) between the valve body (9) and the large diameter part (43d), is greater than the terminal velocity of the valve body (9) relative to the handling liquid (L1), the valve body (9) can be lifted by the flow of the handling liquid (L1) and move from the valve open position (P1) to the valve closed position (P2). Here, the terminal velocity 'Vs' of the valve body (9) (in the fluid) relative to the fluid (handling liquid (L1)) is calculated based on an equation representing the terminal velocity, for example, the Stokes equation.

[0065] In addition, the velocity 'Vf' of a fluid flowing at a flow rate 'Q' through a pipe with cross-sectional area 'A' is expressed by the following equation (1).

[0066] Vf=Q / A (1)

[0067] Accordingly, by designing the shape of the large diameter section (43d) and the valve body (9) (cross-sectional area 'A' of the gap (S)) to satisfy the relationship 'Vf>>Vs' (preferably 'Vf>>Vs'), the valve body (9) moves to the valve closing position (P2) by the flow of the handling fluid (L1).

[0068] Here, when the passing fluid is the working fluid (L2), the shape of the large diameter section (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), just as with the handling fluid (L1). Accordingly, the shape of the large diameter section (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 closing position (P2) regardless of whether the handling fluid (L1) or the working fluid (L2) flows into the valve chamber (Rv). As described above, the housing (4) can be divided into a first housing (41) to a third housing (43). And, in the valve chamber (Rv), the large diameter section (43d) that determines the cross-sectional area 'A' of the gap (S) is placed in the interchangeable third housing (43). Therefore, by simply replacing the third housing (43) with another third housing (43) having a different shape of the through hole (43c) (large diameter portion (43d)), a suitable gap (S) corresponding to the shape and specific gravity of the valve body (9) can be formed. That is, the flow velocity 'Vf' that urges the movement of the valve body (9) can be adjusted relatively easily by changing the terminal velocity 'Vs'. Likewise, the shape of the valve seat surface (42b) can also be arbitrarily selected by replacing the second housing (42).

[0069] Additionally, in the present invention, the flow velocity may be calculated using the cross-sectional area of ​​the valve chamber (Rv) or the small diameter section (43e) instead of the gap (S). In this case, the cross-sectional area of ​​the valve chamber (Rv) or the small diameter section (43e) is larger than the cross-sectional area of ​​the gap (S). Therefore, the flow velocity of the handling fluid (L1) in the valve chamber (Rv) or the small diameter section (43e) becomes slower than the flow velocity in the gap (S). Even under this condition, if the relationship 'Vf > Vs' is satisfied, the relationship 'Vf > Vs' is also reliably satisfied in the gap (S). In this configuration, the flow velocity can be simply calculated using only the cross-sectional area of ​​the path without needing to consider the cross-sectional area of ​​the valve body (9).

[0070] ● Operation of the reciprocating pump system

[0071] 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, refer to FIGS. 1 to 5 as appropriate.

[0072] In the operation of the pump device (1), the driving device (27) reciprocates the plunger (26) to reciprocate the diaphragm (25) (central part (252)) through the working fluid (L2). At this time, the handling liquid (L1) is sucked into the pump chamber (R3) from the suction pipe (22) according to the reciprocating motion of the diaphragm (25), and the handling liquid (L1) inside the pump chamber (R3) is discharged through the discharge pipe (23). Here, when the handling liquid (L1) is sucked into the pump chamber (R3) from the suction pipe (22), the pressure applied to the handling liquid (L1) inside the pump chamber (R3) is reduced, and the dissolved gas of the handling liquid (L1) inside the pump chamber (R3) can be expressed as bubbles (bubbled) inside the pump chamber (R3). In particular, when the inside of the handling liquid (L1) storage tank connected upstream of the flow of the handling liquid (L1) than the suction pipe (22) is pressurized with gas (e.g., N2 or H2), the gas component is likely to dissolve into the handling liquid (L1) and form bubbles within the pump room (R3).

[0073] FIG. 6 is a schematic diagram showing the operation of the main detection device (3) when the diaphragm (25) is not damaged. The diagram indicates the flow of the permeable fluid (gas component) with white arrows. For convenience of explanation, the diagram shows the valve opening position (P1) as the center position of the valve body (9).

[0074] When the diaphragm (25) is not damaged, the handling fluid (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 path (6). In other words, the passing fluid does not flow into the internal path (6). Meanwhile, some of the bubbles present in the pump chamber (R3) pass through the diaphragm (25). As a result, the gas components constituting the bubbles flow into the first path (61) as a passing fluid through the through hole (24a) and the connecting pipe (28) from between the diaphragm seats (25a, 25b). When the pressure of the passing fluid flowing into the first path (61) becomes greater than the pressure that opens the one-way valve (7), the passing fluid flows into the second path (62) and the small diameter section (43e) and flows into the valve chamber (Rv) through the groove section (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 component of the permeating fluid is extremely small compared to the specific gravity of the valve body (9). Therefore, even if the permeating fluid passes through the gap (S), the valve body (9) does not move from the valve opening position (P1). In other words, the valve body (9) is not located at the valve closing position (P2). That is, the gas discharge valve (GV) is open. At this time, the valve chamber (Rv) communicates with the second path (62) and the fifth path (65) through the groove (43g) and the small diameter (43e). Therefore, the permeating fluid flowing into the valve chamber (Rv) does not stop in the fluid path (FP) but is discharged to the outside of the housing (4) through the fifth path (65). As a result, the pressure in the second path (62) (pressure of the permeable fluid) becomes equal to atmospheric pressure, and the reading of the pressure detector (8) does not change.

[0075] FIG. 7 is a schematic diagram showing the operation of the main detection device (3) when the diaphragm (25) is damaged. The drawing shows the state of the main detection device (3) at the timing when the gas discharge valve (GV) is closed due to damage to a part of the diaphragm seat (25a) in contact with the handling fluid (L1). The drawing shows the flow of the passing fluid with gray arrows. For convenience of explanation, the drawing shows the valve closing position (P2) as the center position of the valve body (9).

[0076] When the diaphragm (25) is damaged (assuming the diaphragm seat (25a) is damaged), the handling fluid (L1) flows from the damaged portion (X) through the diaphragm seat (25a) and into the space between the diaphragm seats (25a, 25b). At this time, a pressure equivalent to the maximum discharge pressure is applied to the incoming handling fluid (L1). Accordingly, the handling fluid (L1) flowing into the space between the diaphragm seats (25a, 25b) separates the seal between the diaphragm seats (25a, 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 handling fluid (L1) flowing into the first path (61) is much greater than the pressure that opens the one-way valve (7). Accordingly, the handling fluid (L1) is instantaneously opened by opening the one-way valve (7) to flow into the second path (62) and the small diameter section (43e), and then flows into the valve chamber (Rv) through the groove section (43g). As described above, since the specific gravity of the valve body (9) is lower than that of the handling fluid (L1), the valve body (9) moves to the valve closing position (P2) together with the handling fluid (L1). At this time, the valve body (9) is guided by the valve seat surface (42b), which is a conical surface, and when moving downward, it comes into watertight contact with the valve seat surface (42b) as if surrounding the fifth path (65) in a concentric circle. As a result, the valve body (9) covers a part (upper part) of the valve chamber (Rv) and the fifth path (65) from below. In other words, the fifth path (65) is watertightly closed by the valve body (9). In this way, the gas discharge valve (GV) is closed, thereby blocking the movement of the handling liquid (L1) to the fifth path (65). As previously described, since the movable distance of the valve body (9) is small, the movement of the valve body (9) from the valve open position (P1) to the valve closed position (P2) is completed within an extremely short time. Therefore, no leakage of the handling liquid (L1) to the fifth path (65) occurs (for example, even if leakage to the fifth path (65) occurs, the amount is extremely small).

[0077] FIG. 8 is a schematic diagram showing the operation of the main detection device (3) after the gas discharge valve (GV) is closed.

[0078] When the gas discharge valve (GV) is closed, the valve body (9) is pressed against the valve seat surface (42b) by the pressure of the handling fluid (L1) and fixed in the valve closed position (P2). The handling fluid (L1) stops within the valve chamber (Rv), the groove (43g), the small diameter (43e), and the second path (62) and closes the one-way valve (7). At this time, the pressure within the second path (62) becomes higher than atmospheric pressure due to the handling fluid (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.

[0079] In this way, the detection device (3) is equipped with a gas discharge valve (GV), so that the permeated fluid is discharged to the outside of the housing (4). Therefore, in the detection device (3), even if the gas component contained in the bubbles generated in the pump chamber (R3) passes through the diaphragm (25), the pressure detector (8) does not malfunction. Meanwhile, if damage to the diaphragm (25) occurs, the gas discharge valve (GV) is quickly closed, and the pressure detector (8) detects an increase in pressure caused by 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.

[0080] ●Summary

[0081] According to the above-described embodiment, the detection device (3) comprises a fluid path (FP) (first path (61), second path (62), a small diameter portion (43e) and a groove portion (43g)), a pressure detector (8), a gas discharge valve (GV), a fifth path (65), and a one-way valve (7). The first path (61) is in communication with a through hole (24a) through a connecting pipe (28). The pressure detector (8) detects the pressure of the fluid in the second path (62). The gas discharge valve (GV) comprises a valve body (9), a valve chamber (Rv), and a valve seat surface (42b). The valve chamber (Rv) is positioned 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 positioned above the valve body (9) and opposite the valve body (9). The fifth path (65) is opened at the valve seat surface (42b). The one-way valve (7) is mounted in the fluid path (FP) and allows fluid to pass only from the through hole (24a) side (first path (61) side) to the gas discharge valve (GV) side (second path (62) side). The valve body (9) is movable between the valve closed position (P2) and the valve open position (P1). When the diaphragm (25) is not broken, the valve body (9) is located in the valve open position (P1). When the valve body (9) is not located in 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, when the diaphragm (25) is not damaged, even if permeable fluid enters the fluid path (FP), the permeable fluid flows through the valve chamber (Rv) to the fifth path (65) and is discharged 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), no malfunction of the pressure detector (8) occurs, and no malfunction of detecting damage to the diaphragm (25) occurs even though the diaphragm (25) is not damaged.

[0082] Additionally, according to the above-described embodiment, the specific gravity of the valve body (9) is smaller than the specific gravity of the handling fluid (L1). According to this configuration, when the handling fluid (L1) flows into the valve chamber (Rv), the valve body (9) moves together with the handling fluid (L1) to the valve closing position (P2), and the gas discharge valve (GV) is closed. As a result, the pressure detector (8) detects a rise in pressure of the fluid (handling fluid (L1)) in the second path (62), and the detection device (3) can properly detect the damage of the diaphragm (25).

[0083] In addition, according to the above-described embodiment, the detection device (3) is provided with a one-way valve (7) positioned between the first path (61) and the second path (62) to allow fluid to pass only from the first path (61) to the second path (62). According to this configuration, when the gas discharge valve (GV) is closed, the passing fluid stops reliably within the second path (62) without flowing back 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 reading of the pressure detector (8), once raised, remains stable without significant fluctuation. Therefore, the detection device (3) can detect the failure of the diaphragm (25) more reliably and stably.

[0084] Additionally, according to the above-described embodiment, the shape of the valve body (9) is spherical, and the valve seat surface (42b) is a conical surface that is concave toward the fifth path (65). Since the valve body (9) rises together with the handling liquid (L1), it rises while shaking. Therefore, when the valve body (9) comes into contact with the valve seat surface (42b), the center position of the valve body (9) in the downward direction may be offset from the center of the valve seat surface (42b) (it may be offset from the valve closing position (P2)). However, according to this configuration, the valve body (9) is guided by the valve seat surface (42b) and can finally be positioned in the correct position (valve closing position (P2)).

[0085] ●Examples of Variations●

[0086] Next, a modified example of the present detection device (3) is described below, focusing on the differences from the previously described embodiment (hereinafter referred to as the "first embodiment"). In the following modified example, for convenience of explanation, the same reference numerals as those in the first embodiment are assigned to components identical to those in the first embodiment and components having common functions. In the following modified example, FIGS. 1 to 8 are appropriately referenced.

[0087] Figure 9 (a) is a schematic diagram showing the arrangement of the present detection device (3A) in the present pump device (1) according to a modified example, and (b) is a schematic diagram of the present detection device (3A).

[0088] In the present detection device (3A) according to the modified example, the angle of the housing (4) mounted on the diaphragm head (21a) and the material of the valve body (9) are different from the first embodiment. Specifically, in the present detection device (3A), the housing (4) is mounted on the diaphragm head (21a) at an angle of '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 handling fluid (L1). The shape of the large diameter part (43d) and the valve body (9) (cross-sectional area 'A' of the gap (S)) is designed so that the flow velocity of the handling fluid (L1) flowing through the gap (S) between the valve body (9) and the large diameter part (43d) is (sufficiently) greater than the terminal velocity of the valve body (9) for the handling fluid (L1) and the working fluid (L2). Therefore, even if the valve body (9) is made of a material having a specific gravity greater than that of the handling fluid (L1), when the diaphragm seat (25a, 25b) is damaged, the valve body (9) moves to the valve closing position (P2) and closes the fifth path (65). Therefore, the detection device (3A) can detect damage to the diaphragm (25).

[0089] The second path (62), the through hole (43c) (large diameter portion (43d) and small diameter portion (43e)), and the fifth path (65) extend along a direction inclined by 'θ1°' from the vertical direction. That is, the direction of movement of the valve body (9) within the valve chamber (Rv) is inclined approximately 'θ1°' from the vertical direction and approximately '90°-θ1°' from the horizontal direction. In other words, the inner surface of the valve chamber (Rv) (large diameter portion (43d)) is an inclined surface. The valve seat surface (42b) is positioned diagonally above the valve body (9), that is, above the valve body (9). In this configuration, the gravitational force acting on the valve body (9) is broken down by the inclined surface, so that when a force greater than the component of gravity along the inclined surface is applied to the valve body (9), the valve body (9) rolls up the inclined surface. Accordingly, the flow rate of the handling fluid (L1) required to move the valve body (9) to the valve closing position (P2) is smaller (reduced) than the flow rate when the valve chamber (Rv) extends along the vertical direction (when the direction of movement of the valve body (9) follows the vertical direction). That is, when the specific gravity of the valve body (9) is greater than the specific gravity of the handling fluid (L1), the valve body (9) in the valve chamber (Rv) of this modified example is easier to move than the valve body (9) in the valve chamber (Rv) of the first embodiment.

[0090] In addition, in the modified example, if the diaphragm (25) is not damaged, the valve body (9) may be positioned at the valve opening position (P1) by its own weight, and the angle 'θ1°' is not limited to '30°'. The angle 'θ1°' can be set from '1° to 89°', but preferably, it is an angle (e.g., 30° to 60°) at which the valve body (9) can move smoothly between the valve opening position (P1) and the valve closing position (P2).

[0091] Additionally, in a modified example, only the valve chamber (Rv) (through hole (43c)) may be extended at an angle from 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.

[0092] In addition, in the modified example, the direction and shape of the valve seat surface (42b) may be the same as in the first embodiment. That is, the valve seat surface (42b) may be a conical surface that is concave upward rather than diagonally upward.

[0093] ● Other embodiments ●

[0094] In addition, the valve body (9) in the present invention is not limited to 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 greater than 1. Also, for example, in an environment where the valve body (9) is prone to deformation (e.g., an environment where the temperature of the handling liquid (L1) and / or the discharge pressure is high), the valve body (9) may be made of a material (e.g., metal) having higher strength and heat resistance than synthetic resin.

[0095] In addition, in the present invention, the shape of the valve body (9) corresponds to the shape of the valve seat surface (42b) of the valve body (9) and is not limited to a spherical shape. That is, for example, the shape of the valve body (9) may be conical. Also, when the shape of the valve seat surface (42b) is flat, the shape of the valve body (9) may be disc-shaped, or may have a shape in which an axial portion capable of being inserted and passing through the fifth path (65) protrudes from the center of the disc (inverted T-shape when viewed from the side).

[0096] Furthermore, the principle used for the movement of the valve body (9) in the present invention is not limited to the difference in specific gravity or terminal velocity. That is, for example, the valve body (9) may move by utilizing the difference in resistance (aperture resistance) of the fluid flowing into the capillary tube. Specifically, the valve body (9) is provided with a through hole that, for example, is exposed to the valve chamber (Rv) when the valve body (9) is located at the valve opening position (P1), thereby connecting the valve chamber (Rv) with the fifth path (65), and is not exposed to the valve chamber (Rv) when the valve body (9) is located at the valve closing position (P2). Generally, the aperture resistance of a liquid is greater than the aperture resistance of a gas. Therefore, when permeable fluid flows into the valve chamber (Rv), the permeable fluid flows into the through hole relatively easily, and the valve body (9) does not move to the valve closing position (P2). Meanwhile, when the passing fluid flows into the valve chamber (Rv), the passing fluid cannot easily flow into the through hole due to the aperture resistance at the through hole, and the valve body (9) is pushed to the valve closing position (P2) by the passing fluid filling the valve chamber (Rv).

[0097] In addition, the shape of the valve body (9) in the present invention 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 handling 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 handling liquid (L1).

[0098] Additionally, in the present invention, the shape of the through hole (43c) is such that when the valve body (9) is positioned at the valve opening position (P1), the permeable fluid can flow into the valve chamber (Rv) and the fifth path (65), and is not limited to the shape of the first embodiment. That is, for example, the through hole (43c) may be provided with a plurality of through holes that open at the bottom of the large diameter portion (43d) instead of the small diameter portion (43e) and the groove portion (43g).

[0099] In addition, the configuration of the housing (4) in the present invention is not limited to the configuration 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 discharge valve (GV) may be unitized, and the unit may be mounted inside or outside the housing (4). In addition, a concave portion capable of accommodating and squeezing 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).

[0100] Additionally, in the present invention, the reciprocating pump (2) does not need to be equipped with a tubular connecting pipe (28). In this case, for example, the connecting part (5) of the detection device (3) may be mounted on the diaphragm head (21a) and the connecting part (5) may be in communication with the through hole (24a). In this case, the connecting part (5) is an example of a connecting pipe in the present invention.

[0101] In addition, in the present invention, the fifth path (65) may be equipped with a device for capturing or neutralizing gas components discharged from the gas discharge valve (GV).

[0102] ● Embodiments of the present invention ●

[0103] Next, embodiments of the present invention identified from each of the embodiments described above are described below, using the terms and symbols described in each embodiment.

[0104] A first embodiment of the present invention is a diaphragm damage detection device (e.g., diaphragm damage detection device (3, 3A)) mounted on a reciprocating pump (e.g., reciprocating pump (2)) that sucks in and discharges a handling liquid (e.g., handling liquid (L1)) by the reciprocating motion of a diaphragm (e.g., diaphragm sheets (25a, 25b)) formed by the close contact of two diaphragm sheets (e.g., diaphragm sheets (25a, 25b)), and detects damage to said diaphragm by means of the reciprocating motion of said diaphragm (e.g., diaphragm (25)). The reciprocating pump has an annular peripheral ring (e.g., peripheral ring (24)) disposed between said diaphragm (e.g., diaphragm (25)) and the outer edge portions (e.g., outer edge portions (25c, 25d)) of each of said diaphragm sheets, and the diaphragm damage detection device has a through hole (e.g., through) penetrating said peripheral ring in the radial direction of said peripheral ring. A fluid path (e.g., fluid path (FP)) capable of communicating with a hole (24a)), a pressure detector (e.g., pressure detector (8)) for detecting pressure within the fluid path, a gas discharge valve (e.g., gas discharge valve (GV)) positioned above the fluid path and connected to the fluid path, a discharge path (e.g., fifth path (65)) connected to the gas discharge valve, and a one-way valve (e.g., one-way valve (7)) mounted in the fluid path to allow fluid to pass only from the side of the through hole to the side of the gas discharge valve, wherein the gas discharge valve comprises 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, and a valve seat surface (e.g., valve seat surface (42b)) positioned above the valve body and facing the valve body, wherein the discharge path is open to the valve seat surface, and the valve body is in a valve closed position (e.g., valve seat surface (42b)) such that the valve body contacts the valve seat surface and covers the discharge path. Listen,A diaphragm breakage detection device is movable between a valve closed position (P2)) and a valve open position (e.g., valve open position (P1)) in which the valve body is spaced apart from the valve seat surface and does not cover the discharge path, and is located at the valve open position when the diaphragm is not broken, and the valve chamber communicates with the fluid path and the discharge path when the valve body is not located at the valve closed position.

[0105] According to this configuration, malfunctions that detect diaphragm damage do not occur even though the diaphragm is not damaged.

[0106] A second embodiment of the present invention is a diaphragm breakage detection device (e.g., diaphragm breakage detection device (3)) in which the specific gravity of the valve body in the first embodiment is smaller than the specific gravity of the handling fluid.

[0107] According to this configuration, the detection device can properly detect damage to the diaphragm.

[0108] 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 handling liquid, and the valve chamber and the valve body are formed such that when the handling liquid that has passed through the diaphragm flows into the valve chamber, the flow velocity of the handling liquid within the valve chamber becomes greater than the terminal velocity of the valve body relative to the handling liquid.

[0109] According to this configuration, the valve body can be formed from a material having high strength and heat resistance.

[0110] The fourth embodiment of the present invention is a diaphragm breakage detection device in which the direction of movement of the valve body in the third embodiment is inclined with respect to the vertical and horizontal directions.

[0111] According to this configuration, the flow rate required to move the valve body is reduced.

[0112] The fifth embodiment of the present invention is a diaphragm breakage detection device in which, in any one of the first to fourth embodiments, the shape of the valve body is spherical and the valve seat surface is an inverted conical surface that is conically concave toward the discharge path.

[0113] According to this configuration, the valve body is guided by the valve seat surface and can finally be positioned in the correct position (valve closed position).

[0114] A sixth embodiment of the present invention is a reciprocating pump device (e.g., reciprocating pump device (1)) comprising a diaphragm (e.g., diaphragm (25)) formed by two diaphragm sheets (e.g., diaphragm sheets (25a, 25b)) being in close contact, an annular main ring (e.g., main ring (24)) disposed between the outer edges (e.g., outer edges (25c, 25d)) of each of the two diaphragm sheets, and a connecting pipe (e.g., connecting pipe (28)) connected to a through hole (e.g., through hole (24a)) penetrating the main ring in the radial direction of the main ring, and a diaphragm damage detection device according to a first embodiment (e.g., diaphragm damage detection device (3, 3A)) mounted on the reciprocating pump to detect damage to the diaphragm.

[0115] With this configuration, a malfunction does not occur in which a diaphragm breakage is detected even though the diaphragm is not damaged. Explanation of the symbols

[0116] 1 Reciprocating pump unit 2 Reciprocating pump 3 Diaphragm breakage detection device 42b Valve seat surface 43e Small diameter section (2nd fluid path) 43g Groove section (2nd fluid path) 61 1st path (1st fluid path) 62 2nd path (2nd fluid path) 65 5th path (discharge path) 7 One-way valve 8 Pressure detector 9 Valve body FP Fluid path GV Gas discharge valve P1 Valve open position P2 Valve closed position

Claims

Claim 1 A diaphragm failure detection device is mounted on a reciprocating pump that sucks in and discharges a handling liquid by the reciprocating motion of a diaphragm formed by the close contact of two diaphragm sheets, and detects failure of the diaphragm, wherein the reciprocating pump comprises the diaphragm, an annular peripheral ring disposed between the outer edges of each of the two diaphragm sheets, and a pump chamber on which one side of the diaphragm faces, wherein the handling liquid is sucked in and discharged by the reciprocating motion of the diaphragm, and wherein the diaphragm has gas permeability such that a gas contained in the handling liquid sucked into the pump chamber can pass through, and the diaphragm failure detection device comprises a fluid path capable of communicating with a through hole penetrating the peripheral ring in the radial direction of the peripheral ring, a pressure detector for detecting pressure within the fluid path, a gas discharge valve disposed above the fluid path and connected to the fluid path, a discharge path connected to the gas discharge valve, and a discharge path mounted on the fluid path extending only from the side of the through hole to the side of the gas discharge valve. A diaphragm breakage detection device comprising a unidirectional valve for passing fluid, wherein the gas discharge valve comprises a valve body, a valve chamber communicating with the fluid path and accommodating the valve body, and a valve seat surface positioned above the valve body and facing the valve body, wherein the discharge path is open to the valve seat surface, and the valve body is movable between a valve closed position in which the valve body contacts the valve seat surface and covers the discharge path, and a valve open position in which the valve body is spaced apart from the valve seat surface and does not cover the discharge path, wherein the valve is located at the valve open position when the diaphragm is not broken, and the valve chamber communicates with the fluid path and the discharge path when the valve body is not located at the valve closed position. Claim 2 A diaphragm breakage detection device according to claim 1, wherein the specific gravity of the valve body is smaller than the specific gravity of the handling fluid. Claim 3 A diaphragm breakage detection device according to claim 1, wherein the specific gravity of the valve body is greater than the specific gravity of the handling liquid, and the valve chamber and the valve body are formed such that when the handling liquid passing through the diaphragm flows into the valve chamber, the flow velocity of the handling liquid within the valve chamber becomes greater than the terminal velocity of the valve body relative to the handling liquid. Claim 4 In claim 3, the movement direction of the valve body is inclined with respect to the vertical and horizontal directions, a diaphragm breakage detection device. Claim 5 A diaphragm breakage detection device according to any one of claims 1 to 4, wherein the shape of the valve body is spherical and the valve seat surface is an inverted conical surface that is conically concave toward the discharge path. Claim 6 A reciprocating pump device comprising: a diaphragm formed by the close contact of two diaphragm sheets; an annular peripheral ring disposed between the outer edges of each of the two diaphragm sheets; a pump chamber facing one side of the diaphragm, through which a handling liquid is sucked in and discharged by the reciprocating motion of the diaphragm; and a connecting pipe connected to a through hole penetrating the peripheral ring in the radial direction of the peripheral ring; and a diaphragm damage detection device according to claim 1 mounted on the reciprocating pump to detect damage to the diaphragm, wherein the diaphragm has gas permeability capable of allowing a gas contained in the handling liquid sucked into the pump chamber to pass through.

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