JP7427838B1 - Diaphragm breakage detection device and reciprocating pump device - Google Patents

Abstract

The present invention provides a diaphragm damage detection device and a reciprocating pump device that do not cause malfunction even if gas components contained in bubbles generated in a pump chamber pass through the diaphragm. A diaphragm damage detection device (3) according to the present invention detects damage to a diaphragm (25) of a reciprocating pump (2). The diaphragm damage detection device includes a fluid path FP that can communicate with the through hole 24a of the peripheral ring 24, a pressure detector 8 that detects the pressure in the fluid path, a gas exhaust valve GV connected to the fluid path, and a gas exhaust valve GV that is connected to the fluid path. and a discharge path 65 connected to the valve. The gas exhaust valve includes a valve body 9, a valve chamber Rv that accommodates the valve body, and a valve seat surface 42b arranged above the valve body. The discharge path opens into 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 damaged. The valve chamber communicates with the fluid path and the discharge path when the valve body is not in the closed position. [Selection diagram] Figure 1

Description

The present invention relates to a diaphragm damage detection device and a reciprocating pump device.

A reciprocating pump sucks in and discharges a liquid by reciprocating a membrane-like diaphragm. The diaphragm is housed in the casing of the reciprocating pump, and divides a space (diaphragm chamber) within the casing into a fluid pressure chamber and a pump chamber. The fluid pressure chamber is filled with a working fluid (for example, oil), and a plunger that reciprocates within the fluid pressure chamber is arranged to face the diaphragm. As the plunger reciprocates, the diaphragm reciprocates. As a result, the volume of the pump chamber changes, the handling liquid is sucked into the pump chamber, and the handling liquid is discharged from the pump chamber. In a reciprocating pump configured in this manner, if the diaphragm is damaged, not only the performance of the reciprocating pump is reduced, but also the working fluid may be mixed into the handled liquid. Therefore, 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 (for example, see Patent Document 1). ).

In the reciprocating pump disclosed in Patent Document 1, a diaphragm is formed by bringing two diaphragm sheets into close contact with each other. A ring plate-shaped peripheral ring is attached between the outer edges of each of the two diaphragm sheets. The peripheral ring includes a through hole passing through the peripheral ring in a radial direction of the peripheral ring. A pipe connected to a pressure gauge is connected to the through hole. With this configuration, if one of the two diaphragm seats breaks for some reason during operation of the reciprocating pump, the working fluid or handling fluid flows between the two diaphragm seats and into the through hole and piping. As a result, the pressure in the fluid pressure chamber or the pump chamber is transmitted to the pressure gauge via the inflowing liquid, and damage to the diaphragm can be detected by an increase in the indicated value of the pressure gauge.

Japanese Patent Application Publication No. 11-132149

Generally, the diaphragm is made of synthetic resin such as rubber or fluororesin. When these synthetic resins are made into thin films, they have pores (gaps) so minute that liquids cannot pass therethrough but gases can pass through them. That is, the thin synthetic resin diaphragm has a certain degree of gas permeability. Therefore, when handling liquid that is likely to generate bubbles due to an increase or decrease in the pressure of the handling liquid in the pump chamber (for example, a handling liquid that contains a large amount of dissolved gas, a handling liquid that easily vaporizes, etc.), bubbles may be generated in the pump chamber. Air bubbles can pass through the diaphragm. As a result, gas components constituting the bubbles remain in the detection device, causing a malfunction in which the reading on the pressure gauge increases even though the diaphragm is not damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a diaphragm damage detection device and a reciprocating pump device that do not cause malfunction even when gas components in a pump chamber pass through the diaphragm.

The diaphragm breakage detection device in one embodiment of the present invention is attached to a reciprocating pump that sucks and discharges a liquid to be handled by the reciprocating movement of a diaphragm formed by closely contacting two diaphragm sheets, and A diaphragm damage detection device for detecting damage, wherein the reciprocating pump includes the diaphragm, an annular peripheral ring disposed between the outer edges of each of the two diaphragm sheets, and one surface of the diaphragm. a pump chamber which faces the diaphragm and into which the handling liquid is sucked and discharged by reciprocating movement of the diaphragm, the diaphragm is arranged so that the gas contained in the handling liquid sucked into the pump chamber is The diaphragm failure detection device has a permeable gas permeability, and the diaphragm failure detection device detects a fluid path that can communicate with a through hole passing through the peripheral ring in a radial direction of the peripheral ring, and a pressure within the fluid path. a pressure sensor; a gas exhaust valve disposed above the fluid path and connected to the fluid path; a gas exhaust path connected to the gas exhaust valve; and a gas exhaust valve attached to the fluid path and connected to the fluid path. a one-way valve that allows fluid to pass only from the hole side to the gas exhaust valve side, and the gas exhaust valve includes a valve body and a valve chamber that communicates with the fluid path and accommodates the valve body. and a valve seat surface disposed above the valve body and facing the valve body, the discharge path opening to the valve seat surface, and the valve body disposed above the valve body and facing the valve body. movable between a closed position in which the body contacts the valve seat surface and covers the discharge path, and an open position in which the valve body separates from the valve seat surface and does not cover the discharge path; When the diaphragm is not damaged, it is in the open position, and the valve chamber communicates with the fluid path and the discharge path when the valve body is not in the closed position.

A reciprocating pump device according to an embodiment of the present invention includes a flexible diaphragm formed by closely contacting two diaphragm sheets, and a circular ring disposed between outer edges of each of the two diaphragm sheets. an annular peripheral ring and a pump chamber in which one surface of the diaphragm faces each other, into which handling liquid is sucked and discharged by reciprocating motion of the diaphragm; and a pump chamber that penetrates the peripheral ring in the radial direction of the peripheral ring. a reciprocating pump comprising a connecting pipe connected to a through hole connected to the reciprocating pump; and a diaphragm breakage detection device according to the above-described embodiment, which is attached to the reciprocating pump and detects breakage of the diaphragm. The diaphragm has gas permeability that allows gas contained in the handling liquid sucked into the pump chamber to pass therethrough .

According to the present invention, it is possible to provide a diaphragm damage detection device and a reciprocating pump device that do not cause malfunction even if gas components in the pump chamber pass through the diaphragm.

1 is a schematic diagram showing an embodiment of a reciprocating pump device according to the present invention. 2 is a partially enlarged schematic sectional view of a peripheral ring and a diaphragm included in the reciprocating pump device of FIG. 1. FIG. 2 is a schematic diagram of a diaphragm damage detection device included in the reciprocating pump device of FIG. 1. FIG. FIG. 4 is a partially enlarged schematic cross-sectional view of a housing included in the diaphragm damage detection device of FIG. 3; 4 is a partially enlarged schematic cross-sectional view of a gas exhaust valve included in the diaphragm damage detection device of FIG. 3. FIG. FIG. 4 is a schematic diagram showing the operation of the diaphragm damage detection device of FIG. 3 when the diaphragm of FIG. 2 is not damaged. FIG. 4 is a schematic diagram showing the operation of the diaphragm damage detection device of FIG. 3 when the diaphragm of FIG. 2 is damaged. FIG. 6 is a schematic diagram showing the operation of the diaphragm damage detection device of FIG. 3 after the gas exhaust valve of FIG. 5 is closed; (a) is a schematic diagram showing the arrangement of the diaphragm damage detection device of FIG. 3 according to a modification in the reciprocating pump device of FIG. 1, and (b) is a schematic diagram of the diaphragm damage detection device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 below. In the following description, each drawing will be referred to as appropriate. In each drawing, the same members and elements are denoted by the same reference numerals, and redundant description will be omitted. Further, the dimensional ratio of each element may be exaggerated for convenience of explanation, and is not limited to the ratio shown in each drawing.

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

This pump device 1 sucks in and discharges the handling liquid L1. The pump device 1 includes a reciprocating pump 2 and a detection device 3.

“Handled liquid L1” is a liquid sent by the present pump device 1. In this embodiment, the handling liquid L1 is, for example, water.

Note that in the present invention, the handling liquid L1 is not limited to water. That is, for example, the handled liquid L1 may include a liquid with a specific gravity of more than 1 (for example, sulfuric acid, etc.), a liquid with a specific gravity of less than 1 (for example, fuel oil, etc.), and a liquid that easily vaporizes (for example, liquefied gas, etc.). ), or a liquid containing a large amount of dissolved gas (for example, a liquid pressurized by gas).

The configuration of the reciprocating pump 2 is common to that of a known reciprocating pump (diaphragm pump) that sucks in and discharges the liquid to be handled by reciprocating the diaphragm. Therefore, in the following explanation, only the outline of the configuration of the reciprocating pump 2 will be explained, and detailed explanation will be 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 device 27 , and a connecting pipe 28 .

The housing 21 houses the plunger 26 and the drive device 27. A part of the casing 21 forms a diaphragm head 21a that sandwiches the peripheral ring 24 and partitions a diaphragm chamber R1 that accommodates a central portion 252 (reciprocating portion) of a diaphragm 25, which will be described later.

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

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

Peripheral ring 24 retains diaphragm 25. The shape of the peripheral ring 24 is a ring plate shape (that is, an annular shape). Peripheral ring 24 includes 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.

FIG. 2 is a partially enlarged schematic sectional view of the peripheral ring 24 and the diaphragm 25.
In the following description, FIG. 1 will be referred to as appropriate.

By reciprocating, the diaphragm 25 sucks the handling liquid L1 into a pump chamber R3, which will be described later, and discharges the handling liquid L1 from the pump chamber R3. The outer edge portion 251 of the diaphragm 25 is attached to the peripheral ring 24 with the center portion 252 of the diaphragm 25 having a predetermined tension. Specifically, the diaphragm 25 is formed by stacking two circular membrane-shaped diaphragm sheets 25a and 25b in close contact with each other. The diaphragm sheets 25a and 25b are made of synthetic resin such as PTFE (polytetrafluoroethylene), for example. An outer edge 25c of the diaphragm sheet 25a is spaced apart from an outer edge 25d of the diaphragm sheet 25b, and a peripheral ring 24 is disposed between the outer edges 25c and 25d. The outer edge portion 25c is attached to the peripheral ring 24 with the central portion 25e of the diaphragm sheet 25a under a predetermined tension, and the outer edge portion 25d is attached to the peripheral ring 24 with the central portion 25f of the diaphragm sheet 25b under a predetermined tension. It is attached to the ring 24. The center portion 25e of the diaphragm sheet 25a is in close contact with the center portion 25f of the diaphragm sheet 25b. The outer edge portions 25c and 25d constitute an outer edge portion 251, and the center portions 25e and 25f constitute a center portion 252.

As mentioned above, the peripheral ring 24 is held between 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 (the space facing the diaphragm sheet 25b) and a pump chamber R3 (the space facing the diaphragm sheet 25a). are doing. The inside of the fluid pressure chamber R2 is filled with a working fluid (for example, oil) L2. The inside of the pump chamber R3 is filled with the handling liquid L1 while the pump device 1 is in operation. In the following description, the "front direction" is the direction in which the pump chamber R3 is located with respect to the diaphragm 25, and the "rear direction" is the direction in which the fluid pressure chamber R2 is located with respect to the diaphragm 25.

In the following description, reference will be made primarily to FIG.
By reciprocating, the plunger 26 causes the center portion 252 of the diaphragm 25 to reciprocate via the working fluid L2. The plunger 26 is arranged 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.

The drive device 27 causes the plunger 26 to reciprocate. The drive 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.

The connecting pipe 28 is a tubular body that communicates the through hole 24a of the peripheral ring 24 with a fluid path FP, which will be described later. One end of the connecting pipe 28 is connected to the through hole 24a.

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

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

●Diaphragm damage detection device●
●Configuration of diaphragm damage detection device FIG. 3 is a schematic diagram of the present detection device 3.
The figure also schematically shows a part of the structure of the reciprocating pump 2 for convenience of explanation. In the following description of the present detection device 3, FIG. 3 will be referred to as appropriate.

The detection device 3 includes a housing 4, a connecting 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 this detection device 3 is the same as that of a conventional diaphragm damage detection device (hereinafter referred to as "conventional detection device"), except that this detection device 3 is equipped with a gas exhaust valve GV, which will be described later. are doing.

FIG. 4 is a partially enlarged schematic cross-sectional view of the housing 4. As shown in FIG.
The figure shows the vicinity of the gas exhaust valve GV in an enlarged manner. This figure shows the valve body 9 in a non-sectional view.

The casing 4 encloses the internal path 6 and also functions as a casing for the gas exhaust valve GV. The housing 4 is made of metal such as stainless steel, for example. The housing 4 is attached to, for example, the diaphragm head 21a so that a second path 62, a through hole 43c, and a fifth path 65 (in the axial direction thereof), which will be described later, extend along the vertical direction. There is. In the front-back direction, the housing 4 is arranged, for example, behind the through hole 24a. The housing 4 includes a first housing 41 , a second housing 42 , and a third housing 43 .

The first housing 41 includes a first path 61, a second path 62, a third path 63, and a fourth path 64, which will be described later. The shape of the first housing 41 is, for example, cylindrical.

The second housing 42 includes a fifth path 65, which will be described later. The shape of the second housing 42 is, for example, cylindrical. The center portion of the lower surface 42a of the second housing 42 is a conical surface (that is, an inverted conical surface) that is conically recessed upward, 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 with bolts (not shown).

The third housing 43 encloses a second path 62 and a valve chamber Rv, which will be described later. The shape of the third housing 43 is, for example, a columnar shape that is flat in the vertical direction. The third housing 43 is provided with a through hole 43c that opens at 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 stepped portion 43f, and a plurality of groove portions 43g. The shape of the large diameter portion 43d is cylindrical, and the shape of the small diameter portion 43e is approximately cylindrical. 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 arranged above the small diameter portion 43e and adjacent to the small diameter portion 43e. The step portion 43f is formed by the ring-shaped bottom of the large diameter portion 43d. A portion of the circumferential surface of the small diameter portion 43e is recessed outward in the radial direction of the small diameter portion 43e from the upper end to the lower end of the small diameter portion 43e, forming a groove portion 43g. The small diameter portion 43e and the groove portion 43g function as part of a fluid path FP that will be described later.

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 held 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 "valve chamber Rv") inside the housing 4. Further, the first to third casings 41 to 43 can be easily disassembled by simply removing bolts. A sealing member (not shown) such as an O-ring or a gasket is provided between the first housing 41 and the third housing 43 and between the second housing 42 and the third housing 43. are placed appropriately.

The connecting portion 5 is, for example, a known tubular joint to which the connecting pipe 28 is connected. The connecting portion 5 is attached to the casing 4 (first casing 41) so as to communicate with an internal path 6 (first path 61 to be described later). The other end of a connecting pipe 28 is connected to the connecting part 5, and the connecting pipe 28 communicates with the internal path 6 via the connecting part 5.

The internal path 6 is arranged (formed) inside the casing 4 (first casing 41), and allows fluid that has flowed (infiltrated) from the diaphragm 25 into the through hole 24a (hereinafter referred to as "inflow fluid"). It is a flowing path. That is, the housing 4 includes the internal path 6. The internal route 6 includes a first route 61 , a second route 62 , a third route 63 , a fourth route 64 , and a fifth route 65 .

The “inflow fluid” is a fluid that passes through or permeates the diaphragm 25, enters the through hole 24a, and flows (infiltrates) into the internal path 6 via the connecting pipe 28 and the connecting portion 5. For example, when the diaphragm sheets 25a, 25b (diaphragm 25) are damaged, the fluid passing through the diaphragm 25 (hereinafter referred to as "passing fluid") flows from the damaged point X (see FIG. 7; the same applies hereinafter) to the diaphragm sheets 25a, 25b, The handling liquid L1 and/or the working fluid L2 pass through the diaphragm sheets 25b and flow (infiltrate) between the diaphragm sheets 25a and 25b. The fluid that has passed through the diaphragm 25 (hereinafter referred to as "permeated fluid") may be, for example, bubbles generated based on a gas component (dissolved gas) dissolved in the handling liquid L1, bubbles contained in the handling liquid L1, and/or These are bubbles that are generated when the handled liquid L1 is vaporized. As mentioned above, since the diaphragm sheets 25a and 25b (diaphragm 25) are made of synthetic resin, liquids (handled liquid L1, working fluid L2) do not pass through the diaphragm 25, but some gases (dissolved gas, etc.) pass through the diaphragm. 25 can pass through. In the following description, the "upstream side" refers to the upstream side of the flow of the inflow fluid within the internal path 6, and the "downstream side" refers to the downstream side of the flow of the inflow fluid within the internal path 6.

The first path 61 and the second path 62 are paths through which inflow fluid flows between the connecting portion 5 and the gas exhaust valve GV. The first path 61 is arranged inside the first casing 41 so as to extend in series (for example, in the vertical direction (horizontal direction)) with respect to the second path 62 . An upstream end 61 a of the first path 61 is connected to the connecting portion 5 , and a downstream end 61 b of the first path 61 is connected to the one-way valve 7 . That is, the first path 61 communicates with the connecting pipe 28 via the connecting portion 5 and can communicate with the second path 62 via the one-way valve 7. The second path 62 is arranged inside the first housing 41 along the vertical direction. An 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 open at the center of the upper surface 41a of the first housing 41, and the small diameter portion 43e and groove portion 43g of the third housing 43 are disposed above the downstream end 62b. is connected to. Therefore, the downstream end 62b of the second path 62 is located above the upstream end 62a of the second path 62, and the small diameter portion 43e and the groove portion 43g are located above the downstream end 62b. The first path 61, the second path 62, the small diameter portion 43e, and the groove portion 43g constitute a fluid path FP through which the inflow fluid from the connecting pipe 28 flows to the gas discharge valve GV.

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 casing 4 . The third path 63 is arranged inside the first casing 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 is open to the outer surface of the casing 4 (first casing 41).

The fourth path 64 is a pressure port connected between the second path 62 and the pressure detector 8 so that the pressure sensor 8 detects the pressure of the fluid in the second path 62. The fourth path 64 is arranged inside the first casing 41.

The fifth path 65 is a path through which the permeated fluid that has flowed into the fluid path FP is discharged to the outside of the casing 4 . The fifth path 65 is arranged inside the second housing 42 along the vertical direction. The upstream end 65a of the fifth path 65 opens at the center of the valve seat surface 42b, and the downstream end 65b of the fifth path 65 opens at the outer surface of the casing 4 (second casing 42). The fifth route 65 is an example of a discharge route in the present invention.

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

The pressure detector 8 detects the (fluid) pressure within the second path 62 . The pressure detector 8 is, for example, a known pressure gauge.

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

The valve body 9 functions as a valve body of the gas exhaust 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 passing fluid. As will be described later, the material of the valve body 9 is determined based on the difference in specific gravity with the handling liquid L1 and/or the terminal velocity (also referred to as terminal sedimentation velocity or terminal velocity) with respect to the handling liquid L1 (working fluid L2). In this embodiment, it is made of polypropylene (PP). The shape of the valve body 9 is determined in accordance with the shape of the valve seat surface 42b relative to the valve body 9, and is spherical in this embodiment. The valve body 9 is accommodated 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, in the horizontal direction, a gap S is formed between the valve body 9 and the large diameter portion 43d.

The drain valve 10 is a drain valve used to discharge 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 installed within the third path 63.

●Configuration of gas exhaust valve FIG. 5 is a partially enlarged schematic sectional view of the gas exhaust valve GV.
This figure shows the valve body 9 in a non-sectional view. In this figure, for convenience of explanation, the valve body 9 and the second path 62 when located at the valve closing position P2 are shown by two-dot chain lines. In this figure, for convenience of explanation, the valve open position P1 and the valve closed position P2 are shown at the center of the valve body 9.

The gas discharge valve GV is a valve that discharges the permeated fluid that has flowed into the second path 62 to the outside of the casing 4 and retains the passing fluid that has flowed into the second path 62 inside the casing 4 . That is, the gas discharge valve GV functions as a valve that discharges gas from the fifth path 65 but does not discharge liquid from the fifth path 65. The gas exhaust valve GV includes 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 mentioned above, the valve body 9 is accommodated in the valve chamber Rv. In the vertical direction, the valve seat surface 42b is arranged above the valve body 9 and facing the valve body 9. Within the valve chamber Rv, the valve body 9 is movable between a valve open position P1 and a valve closed position P2. The valve body 9 moves along the valve chamber Rv (large diameter portion 43d). Therefore, the direction of movement thereof is along the axial direction (vertical direction) of the large diameter portion 43d.

“Valve open position P1” is a position where the valve body 9 does not cover (do not block) the fifth path 65 from below. In the present invention, the valve open position P1 is the lowest position within the movement range of the valve body 9 within the valve chamber Rv. In other words, the valve open position P1 is the position in the valve chamber Rv where the valve body 9 is farthest from the valve seat surface 42b. When the valve body 9 is located at the valve open position P1, the valve body 9 is in contact with the stepped portion 43f, the upper part of the small diameter part 43e is closed by the valve body 9, and the upper part of the groove part 43g is closed by the valve body 9. Not blocked by body 9. Therefore, the valve chamber Rv communicates with the second path 62 via the groove 43g. Further, the valve body 9 does not contact the valve seat surface 42b, and the fifth path 65 is not blocked by the valve body 9. Therefore, the valve chamber Rv communicates with the fifth path 65. Here, when the valve body 9 is located at the valve open position P1, the shortest distance between the valve body 9 and the valve seat surface 42b in the vertical direction (that is, the movable distance of the valve body 9) is, for example, The length is set to be as small as about 10 to 20% of the diameter of the valve body 9.

“Valve closed 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 a position where the valve body 9 is in contact with the valve seat surface 42b and is the highest position within the movement range of the valve body 9 within the valve chamber Rv. That is, in the vertical direction, the valve closed position P2 is located above (in this embodiment, directly above) the valve open position P1.

When the specific gravity of the valve body 9 is smaller than the specific gravity of the handling liquid L1, the valve body 9 floats on the handling liquid L1. Therefore, when the handled liquid L1 flows into the valve chamber Rv, the valve body 9 moves together with the handled liquid L1 from the valve open position P1 to the valve closed position P2, and covers (blocks) the fifth path 65. At this time, gas exhaust 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 smaller than the specific gravity of the handled liquid L1, and the valve body 9 moves within the valve chamber Rv together with the handled liquid L1.

On the other hand, 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, the flow velocity of the handling liquid L1 flowing within the valve chamber Rv, particularly within the gap S between the valve body 9 and the large diameter portion 43d, is higher than the final velocity of the valve body 9 with respect to the handling liquid L1. If it is large, the valve body 9 is pushed up by the flow of the handling liquid L1 and can 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) with respect to the fluid (handled liquid L1) is calculated based on, for example, an equation representing the terminal velocity represented by the Stokes equation.

Further, the flow velocity "Vf" of a fluid flowing at a flow rate "Q" in a pipe having a cross-sectional area "A" is expressed by the following equation (1).

Vf=Q/A (1)

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) to satisfy the relationship "Vf>Vs" (preferably "Vf>>Vs"), , the valve body 9 moves to the valve closing position P2 due to the flow of the handling liquid L1.

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) is based on the terminal velocity with respect to the working fluid L2, similar to the handling liquid L1. and can be designed. Therefore, the shape of the large diameter portion 43d and the valve body 9 (cross-sectional area "A" of the gap S) is such that the valve body 9 is in the valve closing position P2 regardless of whether the handling liquid L1 or the working fluid L2 flows into the valve chamber Rv. Designed to be mobile. As mentioned above, the casing 4 can be divided into the first to third casings 41 to 43. The large diameter portion 43d of the valve chamber Rv, which determines the cross-sectional area "A" of the gap S, is arranged in the replaceable third housing 43. Therefore, by simply replacing the third housing 43 with another third housing 43 with a different shape of the through hole 43c (large diameter portion 43d), an appropriate gap S corresponding to the shape and specific gravity of the valve body 9 can be created. Formable. That is, the flow velocity "Vf" that promotes the movement of the valve body 9 can be adjusted relatively easily 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.

Note that, in the present invention, the flow velocity may be calculated using the cross-sectional area of the valve chamber Rv or the small diameter portion 43e instead of the gap S. In this case, the cross-sectional area of the valve chamber Rv or the small diameter portion 43e is larger than the cross-sectional area of the gap S. Therefore, the flow rate of the handling liquid L1 in the valve chamber Rv or the small diameter portion 43e is slower than the flow rate in the gap S. If the relationship “Vf>Vs” is satisfied under this condition, the relationship “Vf>Vs” is certainly satisfied also in the gap S. With this configuration, there is no need to consider the cross-sectional area of the valve body 9, and the flow velocity can be simply calculated using only the cross-sectional area of the path.

●Operation of the reciprocating pump device Next, the operation of the pump device 1 will be explained below, focusing on the operation of the detection device 3. In the following description, FIGS. 1 to 5 will be referred to as appropriate.

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, according to the reciprocating movement 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 decreasing, and the dissolved gas in the handled liquid L1 in the pump chamber R3 is lowered. may appear as bubbles (bubbles) in the pump chamber R3. In particular, if the inside of the storage tank for the handling liquid L1 connected to the upstream side of the flow of the handling liquid L1 than the suction pipe 22 is pressurized with gas (for example, N ₂ or H ₂ ), the gas components dissolves in the handled liquid L1 and tends to form bubbles in the pump chamber R3.

FIG. 6 is a schematic diagram showing the operation of the present detection device 3 when the diaphragm 25 is not damaged. In the figure, the flow of the permeated fluid (gas component) is shown by white arrows. In this figure, for convenience of explanation, the valve opening position P1 is shown as the center position of the valve body 9.

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

FIG. 7 is a schematic diagram showing the operation of the present detection device 3 when the diaphragm 25 is damaged. This figure shows the state of the detection device 3 at a time when a portion of the diaphragm sheet 25a that is in contact with the handled liquid L1 is damaged and the gas exhaust valve GV is closed. The figure shows the flow of passing fluid with gray arrows. In this figure, for convenience of explanation, the valve closing position P2 is shown at the center position of the valve body 9.

When the diaphragm 25 is damaged (assuming that the diaphragm sheet 25a is damaged), the handling liquid L1 passes through the diaphragm sheet 25a from the damaged location X and flows between the diaphragm sheets 25a and 25b. At this time, a pressure equivalent to the discharge pressure at the maximum is applied to the handled liquid L1 that has flowed in. Therefore, the handling liquid L1 that has flowed between the diaphragm sheets 25a and 25b peels off the close contact 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 handling liquid L1 that has flowed into the first path 61 is sufficiently higher than the pressure that causes the one-way valve 7 to open. Therefore, the handled liquid L1 instantaneously 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 via the groove portion 43g. As described above, since the specific gravity of the valve body 9 is smaller than the specific gravity of the handling liquid L1, the valve body 9 moves to the valve closing position P2 together with the handling liquid L1. At this time, the valve body 9 is guided by the valve seat surface 42b, which is a conical surface, and comes into fluid-tight contact with the valve seat surface 42b so as to concentrically surround the fifth path 65 when viewed from below. There is. As a result, the valve body 9 covers a portion (upper end) of the valve chamber Rv and the fifth passage 65 from below. In other words, the fifth path 65 is fluid-tightly closed by the valve body 9. In this way, the gas discharge valve GV is closed and prevents the handled liquid L1 from moving to the fifth path 65. As described above, 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 in a very short time. Therefore, the handled liquid L1 does not leak into the fifth path 65 (even if leakage occurs into the fifth path 65, the amount is extremely small).

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

When the gas exhaust valve GV is closed, the valve body 9 is pressed against the valve seat surface 42b by the pressure of the handled liquid L1 and is fixed at the valve closed position P2. The handling 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 indicated value of the pressure detector 8 increases. As a result, damage to the diaphragm 25 can be detected.

As described above, since the detection device 3 includes the gas discharge valve GV, the permeated fluid is discharged to the outside of the casing 4. Therefore, in this 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. On the other hand, if the diaphragm 25 is damaged, the gas exhaust valve GV is immediately closed, and the pressure detector 8 detects an increase in pressure due to the passing fluid flowing into the second path 62. Therefore, the present detection device 3 can detect damage to the diaphragm 25 without delay.

Summary According to the embodiment described above, the present detection device 3 includes the fluid path FP (first path 61, second path 62, small diameter portion 43e, and groove portion 43g), the pressure detector 8, and the gas exhaust valve. A GV, a fifth path 65, and a one-way valve 7 are provided. The first path 61 can communicate with the through hole 24a via the connecting pipe 28. Pressure detector 8 detects the pressure of the fluid within second path 62 . The gas exhaust valve GV includes a valve body 9, a valve chamber Rv, and a valve seat surface 42b. The valve chamber Rv is arranged 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 arranged above the valve body 9 and facing 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 allows fluid to pass 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 open position P1. When the diaphragm 25 is not damaged, the valve body 9 is located at the valve open 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 to the fifth path 65 via the valve chamber Rv and flows to the outside of the casing 4. be discharged. 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, even though the diaphragm 25 is not damaged. Therefore, the malfunction of detecting damage to the diaphragm 25 does not occur.

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

Furthermore, according to the embodiment described above, the present detection device 3 is arranged between the first path 61 and the second path 62, and allows fluid to flow only from the first path 61 to the second path 62. A one-way valve 7 is provided. According to this configuration, when the gas exhaust valve GV is closed, the passing fluid is reliably retained 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 in the second path 62 does not increase or decrease significantly, and the indicated value of the pressure detector 8, once increased, remains stable without greatly fluctuating. Therefore, the present detection device 3 can detect damage to the diaphragm 25 more reliably and stably.

Furthermore, according to the embodiment described above, the shape of the valve body 9 is spherical, and the valve seat surface 42b is a conical surface recessed in a conical shape toward the fifth path 65. The valve body 9 rises together with the handling liquid L1, and thus rises while shaking. Therefore, when the valve body 9 comes into contact with the valve seat surface 42b, the position of the center of the valve body 9 in a downward view may shift from the center of the valve seat surface 42b (may shift from the valve closing position P2). However, according to this configuration, the valve body 9 can be guided by the valve seat surface 42b and finally located at the normal position (valve closed position P2).

●Modified example●
Next, a modified example of the present 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 convenience of explanation, the same members as in the first embodiment and members having common functions are given the same reference numerals as in the first embodiment. In the following modified examples, FIGS. 1 to 8 will be referred to as appropriate.

FIG. 9(a) is a schematic diagram showing the arrangement of the present detection device 3A according to a modification in the present pump device 1, and FIG. 9(b) is a schematic diagram of the present detection device 3A.

In the present detection device 3A according to the modification, the angle of the casing 4 attached to 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 tilted at an angle of "θ ₁ ° (for example, 30°)" compared to the housing 4 of the first embodiment, and is attached to the diaphragm head 21a. attached. The valve body 9 is made of a material (for example, SUS440C) having a specific gravity greater than the specific gravity of the handled liquid L1. The flow rate of the handling liquid L1 flowing in the gap S between the valve body 9 and the large diameter portion 43d is large (sufficiently) higher than the terminal velocity of the valve body 9 with respect to the handling liquid L1 and the working fluid L2. The shapes of the diameter portion 43d and the valve body 9 (cross-sectional area "A" of the gap S) are designed. Therefore, even if the valve body 9 is made of a material having a specific gravity greater than the specific gravity of the handled liquid L1, when the diaphragm seats 25a, 25b are damaged, the valve body 9 moves to the valve closing position P2 and follows the fifth path 65. block. Therefore, the present detection device 3A can detect damage to the diaphragm 25.

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 “θ ₁ °” from the vertical direction. That is, the moving direction of the valve body 9 within the valve chamber Rv is inclined by approximately "θ ₁ °" from the vertical direction and approximately "90°-θ ₁ °" from the horizontal direction. That is, the inner peripheral surface of the valve chamber Rv (large diameter portion 43d) is an inclined surface. The valve seat surface 42b is arranged diagonally above the valve body 9, that is, above the valve body 9. In this configuration, the gravity acting on the valve body 9 is broken down by the inclined surface, and when a force equal to or greater than the gravitational force 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 handling liquid L1 required to move the valve body 9 to the valve closing position P2 is as follows when the valve chamber Rv extends along the vertical direction (when the moving direction of the valve body 9 is along the vertical direction). ) is smaller (reduced) than the same flow rate. That is, when the specific gravity of the valve body 9 is larger than the specific gravity of the handled liquid L1, the valve body 9 in the valve chamber Rv of this modification is easier to move than the valve body 9 in the valve chamber Rv of the first embodiment. .

In addition, in the modification, when the diaphragm 25 is not damaged, the valve body 9 only needs to be located at the valve opening position P1 due to its own weight, and the angle "θ ₁ °" is not limited to "30 degrees". The angle "θ ₁ °" can be set to "1° to 89°", but is preferably an angle that allows the valve body 9 to move smoothly between the valve open position P1 and the valve closed position P2 (for example, 30° to 60°).

In a modification, only the valve chamber Rv (through hole 43c) may extend obliquely from the vertical direction. In this case, the configuration of the housing 4 except for the valve chamber Rv is the same as in the first embodiment.

Furthermore, in a modification, the orientation 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 conically recessed upward, instead of being diagonally upward.

●Other embodiments●
Note that 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. In addition, for example, in an environment where the valve body 9 is easily deformed (for example, an environment where the temperature and/or discharge pressure of the handled liquid L1 is high), the valve body 9 may be made of a material having higher strength and heat resistance than synthetic resin ( For example, it may be made of metal.

Further, in the present invention, the shape of the valve body 9 is not limited to a spherical shape as long as it corresponds to the shape of the valve seat surface 42b relative to the valve body 9. That is, for example, the shape of the valve body 9 may be conical. Further, when the shape of the valve seat surface 42b is planar, the shape of the valve body 9 may be a disk shape, or the shaft portion that can be inserted into the fifth path 65 protrudes from the center of the disk. It may have a shape (an inverted T shape when viewed from the side).

Furthermore, in the present invention, the principle utilized for moving the valve body 9 is not limited to specific gravity difference or terminal velocity. That is, for example, the valve body 9 may move using the difference in resistance (restriction resistance) of the fluid flowing into the thin tube. Specifically, for example, when the valve body 9 is located at the valve open position P1, the valve body 9 is exposed to the valve chamber Rv, thereby communicating the valve chamber Rv and the fifth passage 65, and 9 is provided with a pore (through hole) that is not exposed to the valve chamber Rv when it is located at the valve closed position P2. Generally, the throttling resistance of a liquid is greater than that of a gas. Therefore, when the permeated fluid flows into the valve chamber Rv, the permeated fluid flows into the through hole relatively easily, and the valve body 9 does not move to the valve closing position P2. On the other hand, when the passing fluid flows into the valve chamber Rv, the passing fluid cannot easily flow into the through hole due to the throttling resistance in the through hole, and the valve body 9 is moved to the valve closing position P2 by the passing fluid filling the valve chamber Rv. Pushed.

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

Furthermore, in the present invention, the shape of the through hole 43c may be such that the permeated fluid can flow into the valve chamber Rv and the fifth path 65 when the valve body 9 is located at the valve open position P1. It is not limited to the shape of the embodiment. That is, for example, the through hole 43c may include a plurality of through holes opening at the bottom of the large diameter portion 43d instead of the small diameter portion 43e and the groove portion 43g.

Furthermore, in the present invention, the configuration of the housing 4 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. Further, for example, only the gas exhaust valve GV may be formed into a unit, and the unit may be attached to the inside or outside of the housing 4. Furthermore, the upper surface 41a of the first casing 41 and/or the lower surface 42a of the second casing 42 may be formed with a recess that can accommodate and hold the third casing 43.

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

Furthermore, in the present invention, a device for collecting or neutralizing gas components discharged from the gas exhaust valve GV may be attached to the fifth path 65.

●Embodiments of the present invention●
Next, embodiments of the present invention understood from each embodiment described above will be described below, using the terms and symbols described in each embodiment.

In the first embodiment of the present invention, the liquid to be handled (for example, the fluid to be handled) is A diaphragm damage detection device (for example, diaphragm damage detection device 3, 3A) that is attached to a reciprocating pump (for example, reciprocating pump 2) that sucks in and discharges liquid L1) and detects damage to the diaphragm, The reciprocating pump includes an annular peripheral ring (for example, a peripheral ring) arranged between the diaphragm (for example, the diaphragm 25) and the outer edges (for example, the outer edges 25c and 25d) of each of the two diaphragm sheets. 24), the diaphragm damage detection device includes a fluid path (e.g., fluid path FP) that can communicate with a through hole (e.g., through hole 24a) passing through the peripheral ring in the radial direction of the peripheral ring. a pressure detector (e.g., pressure detector 8) that detects the pressure within the fluid path; and a gas exhaust valve (e.g., gas exhaust valve) disposed above the fluid path and connected to the fluid path. valve GV), a discharge path (for example, the fifth path 65) connected to the gas exhaust valve, and a one-way valve attached to the fluid path that allows fluid to flow only from the through hole side to the gas exhaust valve side. a valve (e.g., one-way valve 7), and the gas discharge valve has a valve body (e.g., valve body 9), and a valve chamber that communicates with the fluid path and accommodates the valve body. (for example, a valve chamber Rv), and a valve seat surface (for example, a valve seat surface 42b) disposed above the valve body and facing the valve body, and the discharge path includes the The valve body is open to the valve seat surface and has a closed position (e.g., valve closed position P2) in which the valve body contacts the valve seat surface and covers the discharge path, and a valve-open position (e.g., valve-open position P1) that is away from the surface and does not cover the discharge path; and when the diaphragm is not damaged, the valve is in the valve-open position and the The valve chamber is a diaphragm damage detection device that communicates with the fluid path and the discharge path when the valve body is not in the valve-closed position.
According to this configuration, a malfunction in which damage to the diaphragm is detected even though the diaphragm is not damaged does not occur.

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

In a third embodiment of the present invention, 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 arranged so that the handled liquid passes through the diaphragm. A diaphragm breakage detection device (e.g., a diaphragm breakage detection device) configured such that, when liquid flows into the valve chamber, the flow velocity of the handling liquid in the valve chamber is greater than the terminal velocity of the valve element relative to the handling liquid. Detection device 3A).
According to this configuration, the valve body can be formed of a material having high strength and heat resistance.

A fourth embodiment of the present invention is the diaphragm damage detection device according to the third embodiment, in which the moving direction of the valve body is inclined with respect to the vertical direction and the horizontal direction.
According to this configuration, the flow rate required to move the valve body is reduced.

In a fifth embodiment of the present invention, in any one of the first to fourth embodiments, the shape of the valve body is spherical, and the valve seat surface is recessed in a conical shape toward the discharge path. This is a diaphragm damage detection device with an inverted conical surface.
According to this configuration, the valve body can be guided by the valve seat surface and finally located at the normal position (valve closed position).

A sixth embodiment of the present invention provides a diaphragm (e.g., diaphragm 25) formed by closely adhering two diaphragm sheets (e.g., diaphragm sheets 25a, 25b), and an outer edge of each of the two diaphragm sheets. (for example, the outer edge portions 25c, 25d); and a through hole (for example, the through hole 24a) that penetrates the peripheral ring in the radial direction of the peripheral ring. ), a reciprocating pump (e.g., reciprocating pump 2) comprising: a connecting pipe (e.g., connecting pipe 28) connected to the reciprocating pump; A reciprocating pump device (eg, reciprocating pump device 1) comprising the diaphragm breakage detection device (eg, diaphragm breakage detection device 3, 3A) described in the embodiment.
According to this configuration, a malfunction in which damage to the diaphragm is detected even though the diaphragm is not damaged does not occur.

1 Reciprocating pump device 2 Reciprocating pump 3 Diaphragm damage detection device 42b Valve seat surface 43e Small diameter portion (second fluid path)
43g Groove (second fluid path)
61 First flow path (first fluid path)
62 Second flow path (second fluid path)
65 Fifth flow 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 (6)

A diaphragm breakage detection device that is attached to a reciprocating pump that sucks in and discharges a liquid to be handled by the reciprocating movement of a diaphragm formed by closely contacting two diaphragm sheets, and detects breakage of the diaphragm,
The reciprocating pump is
the diaphragm;
an annular peripheral ring disposed between the outer edges of each of the two diaphragm sheets;
a pump chamber in which one side of the diaphragm faces and into which the handling liquid is sucked and discharged by reciprocating movement of the diaphragm;
Equipped with
The diaphragm has gas permeability that allows gas contained in the handling liquid sucked into the pump chamber to pass therethrough,
The diaphragm damage detection device includes:
a fluid path that can communicate with a through hole passing through the peripheral ring in a radial direction of the peripheral ring;
a pressure detector that detects pressure within the fluid path;
a gas exhaust valve disposed above the fluid path and connected to the fluid path;
a discharge path connected to the gas discharge valve;
a one-way valve that is attached to the fluid path and allows fluid to pass only from the through hole side to the gas discharge valve side;
It has
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;
Equipped 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 contacts the valve seat surface and covers the discharge path, and a valve open position in which the valve body is separated from the valve seat surface and does not cover the discharge path. can be,
When the diaphragm is not damaged, the valve is in the open position;
The valve chamber communicates with the fluid path and the discharge path when the valve body is not in the valve closed position.
Diaphragm breakage detection device. The specific gravity of the valve body is smaller than the specific gravity of the handling liquid.
The diaphragm damage detection device according to claim 1. The specific gravity of the valve body is greater than the specific gravity of the handling liquid,
The valve chamber and the valve body are such that when the handling liquid that has passed through the diaphragm flows into the valve chamber, the flow velocity of the handling liquid in the valve chamber is lower than the final velocity of the valve body with respect to the handling liquid. formed to grow larger,
The diaphragm damage detection device according to claim 1. The moving direction of the valve body is inclined with respect to the vertical direction and the horizontal direction.
The diaphragm damage detection device according to claim 3. The shape of the valve body is spherical,
The valve seat surface is an inverted conical surface that is conically recessed toward the discharge path.
The diaphragm damage detection device according to any one of claims 1 to 4. A diaphragm formed by closely contacting two diaphragm sheets;
an annular peripheral ring disposed between the outer edges of each of the two diaphragm sheets;
a pump chamber in which one side of the diaphragm faces and into which a handled liquid is sucked and discharged by reciprocating movement of the diaphragm;
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;
The diaphragm damage detection device according to claim 1, which is attached to the reciprocating pump and detects damage to the diaphragm.
It has
The diaphragm has gas permeability that allows gas contained in the handling liquid sucked into the pump chamber to pass therethrough.
Reciprocating pump equipment.

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