Pump device

Abstract

The invention provides a pump device capable of detecting damage of a diaphragm with a low-cost structure while using the diaphragm with the low-cost structure. The pump device includes a pump head, a diaphragm, a pump main body, and an adapter member disposed between the pump head and the pump main body. The adapter member includes a hold-down portion sandwiching the diaphragm with the pump head, and a wall portion having a first wall surface continuous with an inner peripheral wall surface of the hold-down portion and forming a space portion on a rear surface of the diaphragm together with the inner peripheral wall surface. A pair of first conductive members attached to the first wall surface side of the adapter member, the lower end portions of the first conductive members being located at the lower end portion of the space portion and facing each other with a predetermined gap therebetween; a cable portion electrically connected to each of the pair of first conductive members at a position above a lower end portion of the space portion; and a detection unit that detects a resistance value between the pair of first conductive members by means of the cable unit, and detects a leak in the space unit.

Description

Technical Field

[0001] The invention relates to a pump device. Background Art

[0002] In the past, a pump device is known that has a mechanism for mounting a pump head on a pump body that accommodates a driving mechanism of the pump. For example, in a pump device of a type in which a reciprocating component such as a diaphragm performs reciprocating motion, the diaphragm may sometimes be damaged during operation of the device. In order to detect damage to the diaphragm, for example, a pressure sensor is arranged in the space on the back side of the diaphragm and the pressure value is read to detect damage to the diaphragm, or the diaphragm is formed by a multilayer structure having a conductive layer and an insulating layer covering both side surfaces thereof, and damage to the diaphragm is detected by detecting changes in the resistance value of the conductive layer (for example, refer to the following patent documents 1 and 2).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-168176

[0006] Patent Document 2: Japanese Patent Application Publication No. 2007-515584 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] However, when using a pressure sensor to detect damage to the diaphragm, an expensive pressure sensor needs to be configured. In addition, the diaphragm damage detection method used in the prior art pump devices disclosed in the above-mentioned Patent Documents 1 and 2 requires the diaphragm to be formed by a multilayer structure having a conductive layer and an insulating layer, so the cost of the diaphragm itself will become high. As such, when it is desired to add a function of detecting damage to the diaphragm to the pump device, there is still a problem that it is difficult to reduce the overall cost of the pump device.

[0009] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a pump device that can use a diaphragm with a low-cost structure and can detect damage to the diaphragm with a low-cost structure.

[0010] Solutions to technical problems

[0011] The pump device involved in the present invention comprises: a pump head formed with a suction port and a discharge port for conveying fluid; a diaphragm attached to the pump head and forming a pump chamber connected to the suction port and the discharge port; a pump body, which includes: a reciprocating component connected to the diaphragm and arranged along the reciprocating direction of the diaphragm, and a driving mechanism capable of driving the reciprocating component along the reciprocating direction of the diaphragm; an adapter component arranged between the pump head and the pump body, the adapter component including: a pressing portion, which clamps the diaphragm with the pump head, and a wall portion, which has a pressing portion and a wall portion having a pressing portion and a wall portion. The inner circumferential wall surface of the tightening portion is continuous and together with the inner circumferential wall surface of the pressing portion, forms the first wall surface of the space portion on the back side of the diaphragm; a pair of first conductive components are installed on the first wall surface side of the adapter component, and their lower ends are located at the lower end of the space portion and are opposite to each other with a specified gap between them; a cable portion is electrically connected to the pair of first conductive components at a position above the lower end of the space portion; a detection portion, which detects changes in the resistance value between the pair of first conductive components through the cable portion, and detects leakage of the conveying fluid into the space portion.

[0012] In one embodiment of the present invention, there is also a pair of second conductive components, which are respectively connected to the pair of first conductive components at the upper position, and at least a portion of which is arranged on the second wall side of the wall portion of the adapter portion opposite to the first wall surface and is electrically connected to the cable portion; the cable portion is electrically connected to the pair of first conductive components through the pair of second conductive components.

[0013] In another embodiment of the present invention, there is also a gasket component installed on the second wall surface of the adapter component, the adapter component has: a central hole portion arranged in the center of the wall portion, the central hole portion is for the reciprocating component to be inserted therein in a liquid-tight manner through the gasket component; and a pair of connecting hole portions arranged on the wall portion around the central hole portion, the gasket component has: a first hole portion for the reciprocating component to be inserted therein in a liquid-tight manner; and a pair of second hole portions arranged at positions overlapping with the pair of connecting hole portions of the adapter component, the first conductive component extends downward from the pair of connecting hole portions on the first wall surface side of the adapter component, and extends toward the lower end portion of the space portion along the inner circumferential wall surface in a manner close to each other, the second conductive component clamps and installs the gasket component between the gasket component and the second wall surface of the wall portion of the adapter component, and is connected to the cable portion on the second wall surface side of the adapter component.

[0014] In still another embodiment of the present invention, the pair of first conductive members are formed into plate shapes that are linearly symmetrical with respect to an axis perpendicular to a central axis passing through the central hole, and are formed of a conductive resin or a corrosion-resistant metal.

[0015] In still another embodiment of the present invention, the first conductive member and the second conductive member are connected via a connecting member that electrically connects the first conductive member and the second conductive member to each other.

[0016] In another embodiment of the present invention, the second conductive component is formed of a conductive resin and comprises: a main body portion having a plate-like portion for pressing the gasket component against the second wall surface and a cylindrical portion having a connecting hole for inserting the electrical connecting portion of the cable portion; a pair of claws protruding from the plate-like portion of the main body portion, passing through the second hole portion and the connecting hole portion and hooked on the first wall surface; a cylindrical portion arranged between the pair of claws and having a connecting component mounting hole portion for mounting the connecting component together with the first conductive component, and the first conductive component having a through hole for inserting the connecting component toward the connecting component mounting hole portion.

[0017] In another embodiment of the present invention, the second conductive component is formed of a metal material and comprises: a plate-shaped main body portion, which presses the gasket component against the second wall surface and forms a through hole for inserting the connecting component; a leaf spring-shaped electrical contact portion, which is folded back from the main body portion toward the pump body side and contacts the electrical connecting portion of the cable portion, and the first conductive component has a connecting component mounting hole portion for installing the connecting component inserted in the through hole.

[0018] Effects of the Invention

[0019] According to the present invention, a diaphragm having a low-cost structure can be used, and damage to the diaphragm can be detected with a low-cost structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a side cross-sectional view schematically showing a pump device according to a first embodiment of the present invention.

[0021] Figure 2 This is a front view showing a state in which an adapter member is mounted on a pump body of the pump device.

[0022] Figure 3 yes Figure 2 A-A' line cross-sectional view.

[0023] Figure 4 It is an explanatory diagram showing an adapter member of the pump device.

[0024] Figure 5 It is an explanatory diagram showing a gasket member mounted on the adapter member.

[0025] Figure 6 It is an explanatory diagram showing a connector portion.

[0026] Figure 7 This is a block diagram showing a circuit configuration for detecting damage to the diaphragm of the pump device.

[0027] Figure 8 It is a front view showing an adapter member mounted on a pump body of a pump device according to a second embodiment of the present invention.

[0028] Fig. 9 This is a front view showing a driving mechanism housed in a pump body of the device.

[0029] Fig.10 yes Figure 8 Enlarged cross-sectional view of line BB'.

[0030] Fig.11 It is an explanatory diagram showing the second conductive member of the pump device.

[0031] Fig.12 It is a front view showing an adapter member mounted on a pump body of a pump device according to a third embodiment of the present invention.

[0032] Fig.13 This is a front view showing a driving mechanism housed in a pump body of the pump device.

[0033] Fig.14 yes Fig.12 Enlarged cross-sectional view of the C-C' line.

[0034] Fig.15 It is an explanatory diagram showing the second conductive member of the pump device. DETAILED DESCRIPTION

[0035] Hereinafter, a pump device according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the solution of the invention.

[0036] In addition, in the following embodiments, the same or equivalent components are marked with the same reference numerals and repeated descriptions are omitted. In addition, in the embodiments, the configuration, proportion, size, etc. of each component are sometimes exaggerated or reduced to be expressed in a state inconsistent with the actual state, and sometimes the description of some components is omitted for expression.

[0037] [First embodiment]

[0038] [Structure of the pump device]

[0039] Figure 1 It is a side cross-sectional view schematically showing a pump device according to a first embodiment of the present invention. Figure 2 This is a front view showing a state in which the adapter member is mounted on the pump body of the pump device. Figure 3 yes Figure 2 A-A' line cross-sectional view.

[0040] like Figure 1 As shown, the pump device 100 of the first embodiment includes: a driving mechanism 10 as a driving source (driving unit), a pump body 20 in which the driving mechanism 10 is housed, and a pump head 30 installed on the front side of the pump body 20. It should be noted that the basic structure of the pump device 100 of this embodiment, including the internal structure, can be composed of a so-called ordinary pump device, so the known structure is not described in detail below and only the outline is described.

[0041] The pump device 100 further includes: an adapter member 40, which is disposed between the pump head 30 and the pump body 20 and is used to mount the pump head 30 on the pump body 20; and a diaphragm 50, which is clamped by the adapter member 40 and mounted on the pump head 30, and is connected to the shaft member 11 as a reciprocating member of the drive mechanism 10 through the adapter member 40. Hereinafter, the direction of the pump body 20 toward the pump head 30 is referred to as the front, and the direction toward the side opposite to the front is referred to as the rear, as shown in FIG. Figure 1 As indicated by arrows in FIG. 1 , the forward and backward movement directions of the diaphragm 50 and the shaft member 11 are referred to as reciprocating movement directions RD.

[0042] The driving mechanism 10 includes, for example, a motor 12, an eccentric cam mechanism 13, and a shaft member 11. The motor 12 drives the rotating shaft 13a of the eccentric cam mechanism 13 to rotate via a gear mechanism 12a. The eccentric cam mechanism 13 converts the rotating motion of the rotating shaft 13a into the reciprocating motion of the shaft member 11 via an eccentric cam portion 13b. The shaft member 11 is driven in the reciprocating motion direction RD in the forward and backward directions by the reciprocating motion converted by the eccentric cam mechanism 13.

[0043] The shaft member 11 is formed of, for example, a rod-shaped metal member or a resin member, and its front side is connected to the diaphragm 50 , and its rear side is connected to the eccentric cam portion 13 b of the eccentric cam mechanism 13 .

[0044] While the shaft member 11 is pushed forward by the eccentric cam portion 13b, the front flange portion 11c is pressed forward by the repulsive force of the spring member 14, thereby moving toward the front side of the pump body 20, causing the diaphragm 50 to be displaced in the forward direction. In addition, the shaft member 11 is pulled back toward the rear side by the eccentric cam portion 13b with a force stronger than the repulsive force of the spring member 14 through the front flange portion 11c, thereby moving toward the rear side of the pump body 20, causing the diaphragm 50 to be displaced in the backward direction.

[0045] The shaft member 11 is pushed and pulled by the eccentric cam portion 13b in the drive mechanism 10 to repeat the above-mentioned forward and backward movements, thereby reciprocating in the reciprocating direction RD. It should be noted that a bracket portion 15 facing the front opening portion 20a of the pump body 20 is provided on the front side (front view) of the drive mechanism 10 to install the adapter member 40 described below.

[0046] In addition, the driving mechanism 10 is not limited to the structure having the motor 12 and the eccentric cam mechanism 13 as described above, as long as its structure can drive the shaft component 11 at least in the direction of forward or backward movement of the diaphragm 50. For example, it may also be a structure that uses an actuator that directly drives the shaft component 11 using, for example, electromagnetic force.

[0047] The shell portion of the pump body 20 is formed of, for example, a resin member. The pump body 20 has: a front opening portion 20a provided on the front side, and a pump base 20b. In addition, the pump body 20 has a storage space 21 provided above the pump base 20b and connected to the front opening portion 20a. The storage space 21 of the pump body 20 is, for example, formed into a cylindrical shape in which the upper and lower portions are parallel surfaces, and is configured so that a portion thereof (for example, the lower side) is connected to the interior of the pump base 20b. In the storage space 21, the drive mechanism 10 is mainly stored, and the cable portion 19 as a wiring, for example, and the bracket portion 15 described above are also stored.

[0048] The pump body 20 has a rear wall 22 disposed on the rear side. A control board 29 connected to the cable unit 19 is mounted on the rear side (rear side surface) 22a of the rear wall 22. Figure 1 The intermediate path of the cable portion 19 is omitted in the figure. The control substrate 29 controls the driving mechanism 10 and controls the operation of the pump device 100 as a whole.

[0049] The control substrate 29 includes a detection unit 29a (see Figure 7 ), the detection unit 29a is used to determine damage to the diaphragm 50 by detecting leakage of the conveying fluid, for example. It should be noted that an operation unit 28 for an operator to perform setting operations of the pump device 100 is provided on the rear side of the pump body 20.

[0050] [Pump head structure]

[0051] The pump head 30 is formed of, for example, a resin component or a metal component such as stainless steel. The pump head 30 has a pump chamber 31 formed in the center. The pump chamber 31 is formed together with the diaphragm 50 mounted on the pump head 30, and its volume changes with the displacement of the diaphragm 50. It should be noted that in the pump device 100 of the present embodiment, a reinforcing plate 30a for reinforcing the mechanical strength of the pump head 30 and a cover member 30b for protecting the reinforcing plate 30a are installed on the front side of the pump head 30.

[0052] The pump head 30 is mounted on the front opening 20a side of the pump body 20 through, for example, an adapter member 40 mounted on the bracket portion 15 of the drive mechanism 10. The pump head 30 has a suction port 32 and a discharge port 33 for conveying a fluid, which are connected to the pump chamber 31. The suction port 32 is connected to, for example, the bottom of the pump chamber 31. The discharge port 33 is connected to, for example, the top of the pump chamber 31.

[0053] The pump head 30 has a first connection port 34 disposed below the suction port 32 and on the suction side of the conveying fluid. In addition, the pump head 30 has a second connection port 35 disposed above the discharge port 33 and on the discharge side of the conveying fluid. The first connection port 34 and the second connection port 35 are connected to the pump chamber 31 through the suction port 32 and the discharge port 33, respectively.

[0054] A cylindrical suction-side adapter 37 is connected to the first connection port 34 through a connection nut 37a in a state where a suction valve 36a is assembled. A cylindrical discharge-side adapter 38 is connected to the second connection port 35 through a connection nut 37b in a state where a discharge valve 36b is assembled. The suction-side adapter 37 connects the suction port 32 of the pump head 30 to the suction-side flow path 39a through the suction valve 36a. The discharge-side adapter 38 connects the discharge port 33 of the pump head 30 to the discharge-side flow path 39b through the discharge valve 36b.

[0055] [Structure of the adapter part]

[0056] Figure 4 is an explanatory diagram showing an adapter component of a pump device, wherein Figure 4 (a) is the front view of the adapter component, Figure 4 (b) is a cross-sectional view of the adapter component.

[0057] The adapter member 40 is formed of, for example, a resin member. The adapter member 40 is disposed between the pump head 30 and the front opening 20a of the pump body 20 (see Figure 1 ). The adapter member 40, for example Figure 2 and Figure 4As shown in (a), the adapter member 40 has a plurality of mounting holes 41 arranged at a predetermined pitch. In addition, the adapter member 40 has a plurality of through holes 42 arranged at a predetermined pitch different from that of the plurality of mounting holes 41.

[0058] The adapter member 40 is fixed to the bracket portion 15 by a fastening means such as a bolt (not shown) inserted into the mounting hole 41. Thus, the adapter member 40 is mounted on the pump body 20 in such a manner as to block the front opening 20a of the pump body 20. Then, for example, by fastening a bolt 42a passing through the reinforcing plate 30a and the insertion hole 42 of the adapter member 40 with a nut (not shown) on the back side of the adapter member 40, the pump head 30 is mounted on the front side of the pump body 20 through the adapter member 40.

[0059] The adapter member 40, for example Figure 4 As shown in (b), there is an annular protrusion 43, which is used to fix the fixing portion 51 (see Figure 1 ) is clamped on the pump head 30; and a wall portion 44 having a first wall surface 44a. In addition, in the adapter component 40, a concave space portion 45 is formed by the inner peripheral wall surface 43a of the annular protrusion 43 and the first wall surface 44a of the wall portion 44 continuous with the inner peripheral wall surface 43a. It should be noted that the depth dimension of the pump head 30 where the diaphragm 50 is installed can also be adjusted, for example, so that the portion of the adapter component 40 corresponding to the annular protrusion 43 is formed into a plane. In this case, the planar portion can become a clamping portion, so the diaphragm 50 can be clamped to the pump head 30 through the clamping portion, and the two can be installed in a liquid-tight manner. Therefore, the clamping portion is not limited to the annular protrusion 43.

[0060] A circular central hole 46 is formed in the center of the wall 44 of the adapter member 40. Figure 4 As shown in (a), a pair of connecting hole portions 47 are formed on the wall portion 44 around the central hole portion 46 of the adapter member 40. Each connecting hole portion 47 has a hole shape in which a circular hole and a rectangular hole are combined in a manner centered on the circular hole, and the rectangular hole portions are arranged to be inclined from the lower end to the upper end so that the rectangular hole portions are close to each other.

[0061] In addition, a pair of guide frames 47a are formed on the first wall surface 44a below the central hole portion 46, which can guide the front end side portion of the electrode portion 48 described below. It should be noted that the adapter member 40 is formed with a drainage hole 47b that penetrates a part of the annular protrusion 43 to communicate with the space portion 45 from the outside, and a drainage bolt 47c is installed in the drainage hole 47b (see Figure 2 ).

[0062] [Structure of gasket parts]

[0063] Figure 5 is an explanatory diagram showing a gasket component mounted on an adapter component, wherein Figure 5 (a) is the front view of the gasket component. Figure 5 (b) is a cross-sectional view of the gasket component.

[0064] The washer member 60 is formed of rubber, for example. The washer member 60 is attached to the second wall surface 44b (see FIG. 1 ) of the wall portion 44 of the adapter member 40 on the side opposite to the space portion 45. Figure 4 (b)). The gasket member 60, for example Figure 5 As shown in (a), the adapter member 40 has a disk portion 61 and a central protrusion 62 having a concave-convex shape in the reciprocating direction RD (a serpentine shape in a direction intersecting the reciprocating direction RD) provided at the center of the disk portion 61. The disk portion 61 is mounted in a state of contacting the second wall surface 44b of the wall portion 44 of the adapter member 40. The central protrusion 62 is inserted into the central hole portion 46 of the wall portion 44 of the adapter member 40 in a liquid-tight manner and exposed in the space portion 45.

[0065] The washer member 60 has a first hole portion 63 and a pair of second hole portions 64. The first hole portion 63 is formed at the center of the central protrusion 62, and the shaft member 11 (see Figure 2 ) is inserted therein in a liquid-tight manner. A pair of second holes 64 are formed at positions corresponding to the pair of connecting holes 47 of the adapter member 40 in the reciprocating direction RD in the disk portion 61 when the adapter member 40 is mounted. Furthermore, the hole shape of each second hole 64 is formed in the same shape as the hole shape of the connecting hole 47 of the adapter member 40 described above. In addition, the arrangement of each second hole 64 is the same as the arrangement of each connecting hole 47 of the adapter member 40 described above.

[0066] It should be noted that if Figure 4 (a) and Figure 5 As shown in (a), the pair of connection holes 47 of the adapter member 40 and the pair of second holes 64 of the washer member 60 are respectively arranged at the same height as the central hole 46 in the horizontal direction or at a position higher than the central hole 46, for example.

[0067] [Structure of the diaphragm]

[0068] like Figure 1 As shown, the diaphragm 50 is connected to the shaft member 11 inserted into the first hole 63 of the central protrusion 62 of the washer member 60. The diaphragm 50 is a member in which an embedded bolt 52 is integrally molded inside a resin such as ethylene propylene rubber (EPDM) and polytetrafluoroethylene (PTFE).

[0069] The diaphragm 50 is driven in the reciprocating direction RD by the driving mechanism 10 housed in the pump body 20 to change the volume of the pump chamber 31 of the pump head 30. The diaphragm 50 is installed in a liquid-tight manner in a state where the fixing portion 51 is clamped between the pump head 30 and the annular protrusion 43 of the adapter member 40 and the front side of the central portion 53 faces the pump chamber 31. It should be noted that, between the diaphragm 50 and the front end of the shaft member 11, for example, a fixing device 54 for maintaining the shape of the diaphragm 50 and holding the position of the diaphragm 50 is arranged.

[0070] And, in Figure 5 The washer assembly 60 is shown mounted on Figure 4 After the adapter part 40 shown, on the wall portion 44 of the adapter part 40, as shown in FIG. Figure 2 and Figure 3 As shown, the electrode portions 48 as a pair of first conductive members and the connector portions 70 as a pair of second conductive members are mounted.

[0071] [Structure of the electrode part]

[0072] The pair of electrode portions 48 are attached, for example, to the first wall surface 44a side of the wall portion 44 of the adapter member 40. The pair of electrode portions 48 extend downward from the portion corresponding to the pair of connection hole portions 47 (not shown) in the space portion 45, and extend toward the bottom of the space portion 45 in a manner close to each other while bending along the inner peripheral wall surface 43a of the annular protrusion 43, and the front ends thereof are arranged at positions facing each other with a predetermined gap therebetween. The front ends of the pair of electrode portions 48 are held by the guide frames 47a.

[0073] The pair of electrode portions 48 are formed, for example, of a conductive resin or a corrosion-resistant metal that is formed to be linearly symmetrical with respect to a vertical axis passing through the central axis of the central hole portion 46 and is in a plate shape. Here, as the conductive resin, for example, there can be listed: modified polyphenylene ether (m-PPE) containing carbon fiber (CF), polypropylene (PP), polyamide (PA) and other resins. In addition, as the corrosion-resistant metal, for example, there can be listed: stainless steel such as SUS304, SUS316, SUS316L, nickel, titanium, alloys such as Alloy20, AlloyB2, AlloyC276, gold, platinum, silver, copper, brass, aluminum and other metals.

[0074] [Connector structure]

[0075] On the other hand, a pair of connector parts 70, for example, formed of the conductive resin described above, are mounted on the second wall surface 44b side of the wall part 44 of the adapter member 40. Specifically, the pair of connector parts 70 are respectively connected to the pair of electrode parts 48 after the disk part 61 of the gasket member 60 is clamped and mounted on the second wall surface 44b. The electrode parts 48 and the connector parts 70, as shown in FIG. Figure 3 As shown, the connection is made, for example, by a connection screw 69 which is a connection member that electrically connects them to each other.

[0076] Figure 6 is an explanatory diagram showing the connector portion 70, wherein Figure 6 (a) is a front view of the connector portion 70, Figure 6 (b) is a top view of the connector portion 70, Figure 6 (c) is a cross-sectional view of the connector portion 70 . Figure 7 This is a block diagram showing a circuit configuration for detecting damage to a diaphragm in a pump device.

[0077] like Figure 6 (a)~ Figure 6 As shown in (c), each connector part 70 includes a main body 71, a pair of claws 72, and a cylindrical part 73. The main body 71 includes a plate-shaped portion 71a and a cylindrical portion 71b. Figure 3 As shown, the plate-like portion 71a is pressed against the disk portion 61 of the washer member 60. A connection hole 71c into which the connection pin 19a serving as an electrical connection portion of the cable portion 19 is inserted is formed in the cylindrical portion 71b.

[0078] The pair of claws 72 are protruding from the plate-like portion 71a of the main body 71 toward the side opposite to the side where the cylindrical portion 71b is formed. The pair of claws 72 have an engaging portion that passes through the second hole portion 64 of the washer member 60 and the connecting hole portion 47 of the adapter member 40 and engages with the first wall surface 44a of the wall portion 44.

[0079] The cylindrical portion 73 is provided between the pair of claw portions 72. A connection component mounting hole portion 73a is formed in the cylindrical portion 73, and the connection screw 69 can be mounted in the connection component mounting hole portion 73a together with the electrode portion 48. It should be noted that a through hole 48a is provided at the position where the pair of electrode portions 48 are connected to the connector portion 70, and the connection screw 69 is inserted into the through hole 48a toward the connection component mounting hole portion 73a.

[0080] Each connector portion 70 is matched with the shape of the connection hole portion 47 of the adapter member 40 and the second hole portion 64 of the gasket member 60, and is installed in such a manner that the hole direction of the connection hole 71c formed in the cylindrical portion 71b of the main body portion 71 is inclined toward the upper side of the central hole portion 46. This makes it easy to insert the connection pin 19a of the cable portion 19 into the connection hole 71c.

[0081] By connecting the electrode portion 48 and the connector portion 70 by the connecting screw 69, as shown in FIG. Figure 7As shown, the electrode portion 48 is electrically connected to the detection portion 29a of the control substrate 29 via the cable portion 19. In addition, since the connector portion 70 is mounted on the adapter member 40 with the gasket member 60 interposed therebetween, leakage of the transport fluid does not penetrate into the second wall surface 44b side of the wall portion 44 from the space portion 45 side of the adapter member 40.

[0082] [Effects of the First Embodiment]

[0083] In the pump device 100 of the first embodiment, as Figure 1 As shown, if the diaphragm 50 is damaged, the transport fluid leaks from the pump chamber 31 side to the space portion 45 side of the adapter member 40 and gradually accumulates at the bottom as leakage liquid F. As a result, the resistance value between the pair of electrode portions 48 in the space portion 45 changes, so the detection portion 29 a detects the presence of the leakage liquid F based on this, and detects the damage of the diaphragm 50.

[0084] Therefore, the diaphragm 50 can use a low-cost diaphragm of a single-layer structure instead of an expensive diaphragm of a multi-layer structure, and the electrode portion 48 and the connector portion 70 can also be formed at a low cost, so it is possible to detect damage to the diaphragm 50 with a low-cost structure. It should be noted that the pair of electrode portions 48 are arranged on the first wall surface 44a side in a linearly symmetrical plate-like manner as described above, and the front end side portion of the electrode portion 48 is guided by the guide frame 47a, so the distance between the electrodes can be accurately set, and the detection accuracy of the resistance value change is high.

[0085] In addition, since the electrode portion 48 has the shape as described above and is connected to the connector portion 70 by the connecting screw 69 through the connecting hole portion 47 and the second hole portion 64 in the positional relationship as described above, a structure can be obtained in which the leakage liquid F accumulated in the space portion 45 will not leak to the side of the second wall 44b before the leakage liquid F in the space portion 45 is detected.

[0086] [Second embodiment]

[0087] Figure 8 It is a front view showing an adapter member mounted on a pump body of a pump device according to a second embodiment of the present invention. Fig. 9 This is a front view showing a driving mechanism housed in a pump body of the pump device. Fig.10 yes Figure 8 Enlarged cross-sectional view of line BB'. Fig.11 is an explanatory diagram showing a second conductive member of a pump device, wherein Fig.11 (a) shows the front side, Fig.11 (b) shows the above. It should be noted that, in the following, the overlapping description of the parts already described will be omitted.

[0088] The pump device according to the second embodiment is different from the pump device 100 according to the first embodiment mainly in the structure of the second conductive member and the electrical connection method between the second conductive member and the cable portion 19, and the other basic structures are the same as those of the first embodiment. That is, in the first embodiment, the cable portion 19 is mounted on the connector portion 70 mounted on the adapter member 40, while in the second embodiment, the cable portion 19 is electrically connected to the electrode portion 48A by simply connecting the adapter member 40 to the bracket portion 15 of the drive mechanism 10 and mounting it on the pump body 20.

[0089] Therefore, it is not necessary to insert the connecting pin 19a of the cable portion 19 into the connecting hole 71c of the connector portion 70 and connect the cable portion 19 before attaching the adapter member 40 to the pump body 20 as in the first embodiment. Fig.11 (a) and Fig.11 As shown in (b), the contact plate 70A as the second conductive member is formed of, for example, a metal material.

[0090] The contact plate 70A has a plate-shaped main body portion 71A and a leaf spring-shaped electrical contact portion 74. Fig.10 As shown, the main body 71A presses the washer member 60 against the second wall surface 44b of the wall portion 44 of the adapter member 40, and has a through hole 76 through which the connecting screw 69 is inserted. In addition, the main body 71A has a pair of cutouts 75 that fit into the positioning protrusions (not shown) formed on the washer member 60, and is used to position the contact plate 70A during installation.

[0091] The electrical contact portion 74 is folded back from the main body portion 71A toward the pump body 20 side. Fig. 9 and Fig.10 As shown, the cable portion 19 is elastically in contact with the contact screw 19b as the electrical connection portion. It should be noted that the cable portion 19, such as Fig. 9 As shown, the cable 19 passes through a lead-out hole 15f provided in a part of the bracket 15 (the upper side in the example shown in the figure), and is led out from the storage space 21 side of the pump body 20 to the front side of the drive mechanism 10. A crimping terminal 19g is connected to the front end side of the cable 19, and the crimping terminal 19g is connected and fixed to a part of the bracket 15 via a rubber bushing 19f using a contact screw 19b, thereby completing the terminal processing of the cable 19.

[0092] A pair of electrode portions 48A, such as Figure 8As shown in FIG. 1 , the electrode portion 48A is arranged on the first wall surface 44a of the wall portion 44 of the adapter member 40 in the same manner as in the first embodiment. However, the electrode portion 48A does not have a through hole 48a as in the previous example, but is formed into a structure with a flat front side. Fig.10 As shown, an insertion portion 77 having a connection member mounting hole portion 48Aa is formed in the electrode portion 48A.

[0093] The connection screw 69 inserted into the through hole 76 of the contact plate 70A is installed in the connection component installation hole portion 48Aa from the second wall surface 44b side. In addition, the insertion portion 77 of the electrode portion 48A is inserted into the connection hole portion 47f formed in the wall portion 44 of the adapter member 40 from the first wall surface 44a side. And after the contact plate 70A and the washer member 60 are installed from the second wall surface 44b side of the wall portion 44 of the adapter member 40, the connection screw 69 is passed through the through hole 76 and the second hole portion 64a and installed in the connection component installation hole portion 48Aa, thereby electrically connecting and fixing the electrode portion 48A and the contact plate 70A.

[0094] Afterwards, if Figure 8 The adapter member 40 shown is mounted as described above to Fig. 9 On the bracket portion 15 of the driving mechanism 10 shown in FIG. Fig.10 As shown, the electric contact portion 74 of the contact plate 70A elastically contacts the contacted screw 19 b , thereby electrically connecting the electrode portion 48A to the control substrate 29 via the cable portion 19 .

[0095] As described above, in the second embodiment, the cable portion 19 can be electrically connected to the electrode portion 48A simply by installing the adapter component 40 on the pump body 20, so there is no need to perform an additional operation to connect the cable portion 19, which can improve the connection operability of the cable portion 19 and also improve the assembly and maintainability of the pump device.

[0096] [Third embodiment]

[0097] Fig.12 It is a front view showing an adapter member mounted on a pump body of a pump device according to a third embodiment of the present invention. Fig.13 This is a front view showing a driving mechanism housed in a pump body of the pump device. Fig.14 yes Fig.12 Enlarged cross-sectional view of the C-C' line. Fig.15 is an explanatory diagram showing a second conductive member of a pump device, wherein Fig.15 (a) shows the front side, Fig.15 (b) shows the bottom (looking up), Fig.15 (c) shows the back side.

[0098] The pump device according to the third embodiment mainly differs from the pump device according to the second embodiment in the electrical connection method between the second conductive member and the cable portion 19, and the other basic structures are the same as those of the second embodiment. That is, in the second embodiment, the cable portion 19 is led out from the lead-out hole portion 15f of the bracket portion 15 to the front side of the bracket portion 15, and the crimping terminal 19g on the front side thereof is connected and fixed to a part of the bracket portion 15 via the rubber bushing 19f using the contacted screw 19b. In contrast, in the third embodiment, the cable portion 19 is not led out to the front side of the bracket portion 15 and screwed and fixed using the contacted screw 19b, but a structure is adopted in which the cable portion 19 is electrically connected to the electrode portion 48A.

[0099] Therefore, it is not necessary to perform the operation of threading and fixing the crimping terminal 19g of the cable part 19 with the contact screw 19b after wiring the cable part 19 on the front side of the bracket part 15 as in the second embodiment, and the assembly efficiency is significantly improved. In order to adopt this structure, in the third embodiment, first, as shown in FIG. Fig.15 (a)~ Fig.15 As shown in (c), the second conductive member is a contact plate 70B formed of, for example, a metal material, similar to the contact plate 70A of the second embodiment.

[0100] The contact plate 70B, like the contact plate 70A, has a structure including a plate-shaped main body 71B and a leaf spring-shaped electrical contact portion 74a. Fig.14 As shown, the washer member 60 is pressed against the second wall surface 44b of the wall portion 44 of the adapter member 40. In addition, the main body 71B has a through hole 76 for inserting the connecting screw 69 and a pair of cutouts 75. The effects of the pair of cutouts 75 are the same as those described above.

[0101] The electrical contact portion 74a is formed to be folded back from the main body portion 71B toward the pump body 20 side similarly to the electrical contact portion 74 of the contact plate 70A. The electrical contact portion 74a is connected to the metal bushing 79 (see Fig.13 ) for elastic contact. Metal bushing 79, such as Fig.14 As shown, for example, the shape is formed by combining a disc-shaped contacted portion 79a and a cylindrical connecting portion 79b which is smaller in diameter than the contacted portion 79a and has a connecting hole 79c formed therein and rises from the center of the contacted portion 79a.

[0102] The cable portion 19 having a connecting pin 19a is mounted on the front end side. Fig.14As shown, first, the cable 19 is inserted into the mounting hole 15g formed in a part of the bracket 15 (in the example shown in the figure, at a position parallel to the central axis of the drive mechanism 10) from the back side (back side) of the bracket 15. Then, the cable 19 is connected to the metal bushing 79 by inserting the connecting pin 19a into the connecting hole 79c of the connecting portion 79b of the metal bushing 79 on the front side of the bracket 15.

[0103] Next, the rubber bushing 19f that covers the entire area from the back side of the contacted portion 79a of the metal bushing 79 to the outer peripheral side of the connecting portion 79b is put on the metal bushing 79. After that, the metal bushing 79 is inserted into the mounting hole 15g from the front side of the bracket 15 together with the rubber bushing 19f, thereby completing the mounting of the metal bushing 79 to the bracket 15 and the wiring of the cable 19. The metal bushing 79 mounted in this way is electrically insulated from the bracket 15 (and the drive mechanism 10) by the rubber bushing 19f.

[0104] As described above, in the third embodiment, compared with the second embodiment, the connection pin 19a of the cable portion 19 is inserted into the connection hole 79c of the metal bushing 79 for connection, so there is no need to perform the operation of screwing and fixing to the bracket portion 15 using the contact screw 19b, thereby improving the assembly performance. In addition, since the surface side of the contact portion 79a of the metal bushing 79 is flat, the contact surface is wider and larger than that of the contact screw 19b, so the reliability of the electrical connection with the electrical contact portion 74a of the contact plate 70B is also improved.

[0105] It should be noted that the manner and structure of mounting a pair of electrode portions 48A on the adapter component 40, as well as the manner of connecting the electrode portions 48A and the contact plate 70B by mounting the adapter component 40 on the bracket portion 15, are the same as those in the second embodiment, and therefore description thereof is omitted here.

[0106] Several embodiments of the present invention are described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their variations are included in the scope and gist of the invention, and are also included in the invention described in the patent claims and their equivalents.

[0107] For example, in the above embodiment, the electrode portions 48 and 48A, as described above, are in the shape of linearly symmetrical plates extending downward from the position corresponding to the connection hole portion 47 and extending close to each other while being bent along the inner peripheral wall surface 43a. In addition, the electrode portions 48 and 48A may be in various shapes as long as they can contact the leakage liquid F of the transport fluid in the space portion 45.

[0108] In addition, the connection method of the connector part 70 and the contact plates 70A, 70B to the cable part 19 is not limited to the above method as long as they are electrically connected. In addition, although in the above embodiment, the case where the electrode parts 48, 48A are electrically connected to the cable part 19 through the connector part 70 and the contact plates 70A, 70B is described, it is not limited to this, and the cable part 19 may be directly connected to the electrode parts 48, 48A without going through these connector parts 70 and contact plates 70A, 70B, etc.

[0109] Description of Reference Numerals

[0110] 10. Driving mechanism

[0111] 11 Axis components

[0112] 20 Pump body

[0113] 21 Storage Space

[0114] 30 Pump head

[0115] 31 Pump Room

[0116] 40 Adapter parts

[0117] 43 Annular convex part

[0118] 43a inner peripheral wall

[0119] 44 Wall

[0120] 44a 1st wall

[0121] 44b 2nd wall

[0122] 46 Central hole

[0123] 47 Connection hole

[0124] 48, 48A electrode part

[0125] 50 Diaphragm

[0126] 60 Washer parts

[0127] 62 Central convex part

[0128] 63 No. 1 hole

[0129] 64 Second hole

[0130] 70 Connector

[0131] 70A, 70B contact plate

[0132] 100 pump units

Claims

1. A pump device, characterized in that: have: A pump head having a suction port and a discharge port for conveying fluid, a diaphragm attached to the pump head and forming a pump chamber communicating with the suction port and the discharge port, A pump body, comprising: a reciprocating component connected to the diaphragm and arranged to be movable along the reciprocating direction of the diaphragm, and a driving mechanism capable of driving the reciprocating component along the reciprocating direction of the diaphragm, an adapter component disposed between the pump head and the pump body, the adapter component comprising: a clamping portion that clamps the diaphragm with the pump head; and a wall portion having a first wall surface that is continuous with the inner peripheral wall surface of the clamping portion and forms a space portion on the back side of the diaphragm together with the inner peripheral wall surface of the clamping portion, a pair of first conductive members, mounted on the first wall surface side of the adapter member, with lower ends thereof being located at the lower end of the space portion and facing each other with a predetermined gap therebetween; The cable portion is electrically connected to the pair of first conductive members at a position above the lower end portion of the space portion, The detection unit detects a change in the resistance value between the pair of first conductive members through the cable unit, thereby detecting leakage of the transport fluid into the space unit.

2. The pump device according to claim 1, characterized in that A pair of second conductive members are further provided, the pair of second conductive members are respectively connected to the pair of first conductive members at the upper positions, at least a portion of which is arranged on the second wall surface side of the wall portion of the adapter member opposite to the first wall surface and is electrically connected to the cable portion, The cable portion is electrically connected to the pair of first conductive members via the pair of second conductive members.

3. The pump device according to claim 2, characterized in that further comprising a gasket member mounted on the second wall surface of the adapter member, The adapter member comprises: a central hole portion provided at the center of the wall portion, into which the reciprocating member is inserted in a liquid-tight manner through the gasket member; and a pair of connecting hole portions provided on the wall portion around the central hole portion, The gasket member includes: a first hole portion into which the reciprocating member is inserted in a liquid-tight manner, and a pair of second hole portions provided at positions overlapping with the pair of connecting hole portions of the adapter member. The first conductive member extends downward from the pair of connection holes on the first wall surface side of the adapter member and extends toward the lower end of the space portion along the inner peripheral wall surface in a manner close to each other. The second conductive member is mounted with the gasket member sandwiched between the second conductive member and the second wall surface of the wall portion of the adapter member, and is connected to the cable portion on the second wall surface side of the adapter member.

4. The pump device according to claim 3, characterized in that The pair of first conductive members are formed into plate shapes that are linearly symmetrical with respect to an axis perpendicular to a central axis passing through the central hole, and are formed of a conductive resin or a corrosion-resistant metal.

5. The pump device according to claim 3, characterized in that The first conductive member and the second conductive member are connected via a connecting member that electrically connects the first conductive member and the second conductive member to each other.

6. The pump device according to claim 5, characterized in that The second conductive member is formed of a conductive resin and has a main body having a plate-shaped portion for pressing the gasket member against the second wall surface and a cylindrical portion having a connection hole for inserting the electrical connection portion of the cable portion; a pair of claws protruding from the plate-like portion of the main body, passing through the second hole and the connecting hole to be hooked on the first wall surface; a cylindrical portion, disposed between the pair of claws, having a connecting component mounting hole formed therein for mounting the connecting component together with the first conductive component, The first conductive member has a through hole into which the connecting member is inserted toward the connecting member mounting hole.

7. The pump device according to claim 5, characterized in that The second conductive component is formed of a metal material and comprises: a plate-shaped main body portion, which presses the gasket component against the second wall surface and is formed with a through hole for inserting the connecting component; and a leaf spring-shaped electrical contact portion, which is folded back from the main body portion toward the pump body side and contacts the electrical connecting portion of the cable portion. The first conductive member has a connecting member mounting hole portion for mounting the connecting member inserted into the through hole.

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