Pump device

Abstract

The utility model provides a pump device which can utilize a diaphragm with a low-cost structure and can detect damage of 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 utility model relates to a pump device. Background Art

[0002] Conventionally, a pump device is known which has a mechanism for mounting a pump head on a pump body that houses a driving mechanism for the pump. For example, in a pump device of a type in which a reciprocating motion member such as a diaphragm reciprocates, the diaphragm sometimes breaks during operation of the device. In order to detect the breakage of 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 the breakage of the diaphragm, or the diaphragm is formed by a multi-layer structure having a conductive layer and insulating layers covering both sides thereof, and the change in the resistance value of the conductive layer is detected to detect the breakage of the diaphragm (for example, refer to Patent Documents 1 and 2 below).

[0003] Prior Art Documents

[0004] Patent Documents

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

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2007-515584 Summary of the Invention

[0007] Technical Problem to be Solved by the Invention

[0008] However, in the case of detecting the breakage of the diaphragm using a pressure sensor, an expensive pressure sensor needs to be arranged. In addition, in the diaphragm breakage detection methods employed by the pump devices of the prior art disclosed in Patent Documents 1 and 2 above, the diaphragm needs to be formed by a multi-layer structure having a conductive layer and insulating layers, so the cost of the diaphragm itself becomes high. Thus, when wanting to add a function for detecting the breakage of the diaphragm to a pump device, there is still a problem that it is difficult to reduce the overall cost of the pump device.

[0009] The present utility model has been completed in view of the above circumstances, and an object thereof is to provide a pump device that can utilize a diaphragm having a low-cost structure and can detect the breakage of the diaphragm with a low-cost structure.

[0010] Means for Solving the Technical Problem

[0011] The pump device according to the present utility model includes: 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 communicating with the suction port and the discharge port; a pump main body including: a reciprocating member connected to the diaphragm and arranged along the reciprocating movement direction of the diaphragm, and a driving mechanism capable of driving the reciprocating member along the reciprocating movement direction of the diaphragm; an adapter member disposed between the pump head and the pump main body, the adapter member including: a pressing 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 pressing portion and forms a space portion together with the inner peripheral wall surface of the pressing portion on the back side of the diaphragm; a pair of first conductive members mounted on the first wall surface side of the adapter member, the lower ends of which are located at the lower end of the space portion and face each other with a predetermined gap therebetween; a cable portion electrically connected to the pair of first conductive members at positions above the lower end of the space portion; and a detection portion that detects a change in the resistance value between the pair of first conductive members through the cable portion and detects the leakage of the conveyed fluid into the space portion.

[0012] In an embodiment of the present utility model, a pair of second conductive members are further included. The pair of second conductive members are connected to the pair of first conductive members at the above positions respectively, and at least a part of them is disposed 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 through the pair of second conductive members.

[0013] In another embodiment of the present utility model, a gasket member mounted on the second wall surface of the adapter member is further included. The adapter member has: a central hole portion provided at the center of the wall portion, through which the reciprocating member is inserted in a liquid-tight manner through the gasket member; and a pair of connection hole portions provided on the wall portion around the central hole portion. The gasket member has: 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 connection hole portions of the adapter member. The first conductive member extends downward from the pair of connection hole portions on the first wall surface side of the adapter member and extends toward the lower end of the space portion in a manner approaching each other along the inner peripheral wall surface. The second conductive member clamps and mounts the gasket member between it 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.

[0014] In yet another embodiment of the present utility model, the pair of first conductive members are formed as plate-like members that are linearly symmetric with respect to a vertical axis passing through the central hole portion, and are formed of a conductive resin or a corrosion-resistant metal.

[0015] In yet another embodiment of the present utility model, the first conductive member and the second conductive member are connected by a connecting member that electrically connects the two to each other.

[0016] In yet another embodiment of the present utility model, the second conductive member is formed of a conductive resin and has: a main body portion having a plate-like portion that presses the washer member against the second wall surface and a cylindrical portion formed with a connection hole into which the electrical connection portion of the cable portion is inserted; a pair of claw portions protruding from the plate-like portion of the main body portion, passing through the second hole portion and the connection hole portion and being hooked on the first wall surface; a cylindrical portion provided between the pair of claw portions and formed with a connection member mounting hole portion for mounting the connection member together with the first conductive member, and the first conductive member has a through hole for inserting the connection member toward the connection member mounting hole portion.

[0017] In yet another embodiment of the present utility model, the second conductive member is formed of a metal material and has: a plate-like main body portion that presses the washer member against the second wall surface and is formed with a through hole for inserting the connection member; a leaf spring-like electrical contact portion that turns back from the main body portion toward the pump main body side and contacts the electrical connection portion of the cable portion, and the first conductive member has a connection member mounting hole portion for mounting the connection member inserted in the through hole.

[0018] Effects of the Invention

[0019] According to the present utility model, it is possible to use a diaphragm with a low-cost structure, and it is possible to detect breakage of the diaphragm with a low-cost structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 3 is Figure 2 a cross-sectional view taken along line A-A' of

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

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

[0025] Figure 6 It is an explanatory view showing the connector portion.

[0026] Figure 7 It is a block diagram showing the circuit structure for detecting breakage of the detection diaphragm of the pump device.

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

[0028] Figure 9 It is a front view showing the drive mechanism housed in the pump body of the device.

[0029] Figure 10 It is Figure 8 An enlarged sectional view taken along line B - B'.

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

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

[0032] Figure 13 It is a front view showing the drive mechanism housed in the pump body of the pump device.

[0033] Figure 14 It is Figure 12 An enlarged sectional view taken along line C - C'.

[0034] Figure 15 It is an explanatory view showing the second conductive member of the pump device.

[0035] Explanation of reference numerals

[0036] 10 Drive mechanism

[0037] 11 Shaft member

[0038] 20 Pump body

[0039] 21 Accommodating space

[0040] 30 Pump head

[0041] 31 Pump chamber

[0042] 40 Adapter member

[0043] 43 Annular convex portion

[0044] Inner peripheral wall surface of 43a

[0045] Wall portion of 44

[0046] First wall surface of 44a

[0047] Second wall surface of 44b

[0048] Central hole portion of 46

[0049] Connection hole portion of 47

[0050] Electrode portions of 48, 48A

[0051] Diaphragm of 50

[0052] Gasket member of 60

[0053] Central convex portion of 62

[0054] First hole portion of 63

[0055] Second hole portion of 64

[0056] Connector portion of 70

[0057] Contact plates of 70A, 70B

[0058] Pump device of 100 Detailed implementation mode

[0059] In the following, with reference to the drawings, the pump device according to the embodiment of the present invention will be described in detail. However, the following embodiments do not limit the invention related to each claim, and the combinations of the features described in the embodiments are not all necessary for the solution of the invention.

[0060] In addition, in the following embodiments, the same or equivalent components are denoted by the same reference numerals and repeated descriptions are omitted. In the embodiments, the arrangement, ratio, dimensions, etc. of each component are sometimes exaggerated or reduced and shown in a state inconsistent with the actual situation, and sometimes the description of a part of the components is omitted.

[0061] [First Embodiment]

[0062] [Structure of Pump Device]

[0063] Figure 1 It is a side sectional view schematically showing the pump device according to the first embodiment of the present invention. Figure 2 It is a front view showing the state where the adapter member is assembled on the pump body of the pump device. Figure 3 It is Figure 2 Cross-sectional view taken along line A-A' of

[0064] As Figure 1 shown, the pump device 100 of the first embodiment includes: a drive mechanism 10 as a drive source (drive unit), a pump main body 20 that houses the drive mechanism 10 therein, and a pump head 30 mounted on the front side of the pump main body 20. It should be noted that the basic configuration of the pump device 100 of the present embodiment, including its internal structure, can be constituted by a so-called ordinary pump device. Therefore, the known structures are not described in detail hereinafter, and only the outline is explained.

[0065] The pump device 100 further includes: an adapter member 40 that is disposed between the pump head 30 and the pump main body 20 and is used to mount the pump head 30 on the pump main body 20; and a diaphragm 50 that is clamped by the adapter member 40 and mounted on the pump head 30, and is connected to the shaft member 11, which is a reciprocating member of the drive mechanism 10, through the adapter member 40. Hereinafter, the direction of the pump main body 20 facing the pump head 30 is denoted as the front, and the direction opposite to the front is denoted as the rear. As Figure 1 shown by the arrow in, the movement directions of the diaphragm 50 and the shaft member 11 in the front and rear directions are denoted as the reciprocating movement direction RD.

[0066] The drive mechanism 10 includes, for example: a motor 12, an eccentric cam mechanism 13, and a shaft member 11. The motor 12 drives the rotation shaft 13a of the eccentric cam mechanism 13 to rotate through a gear mechanism 12a. The eccentric cam mechanism 13 converts the rotational movement of the rotation shaft 13a into a reciprocating movement of the shaft member 11 through an eccentric cam portion 13b. The shaft member 11 is driven in the reciprocating movement direction RD in the front and rear directions by the reciprocating movement converted by the eccentric cam mechanism 13.

[0067] The shaft member 11 is formed, for example, of a rod-shaped metal member or resin member. Its front side is connected to the diaphragm 50, and its rear side is connected to the eccentric cam portion 13b of the eccentric cam mechanism 13.

[0068] While the shaft member 11 is pushed forward by the eccentric cam portion 13b, the front flange portion 11c is pressed toward the front side by the repulsive force of the spring member 14, so as to move toward the front side of the pump main body 20, causing the diaphragm 50 to displace in the forward direction. In addition, the shaft member 11 is pulled back toward the rear side of the pump main body 20 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, causing the diaphragm 50 to displace in the backward direction.

[0069] The shaft member 11 is pushed and pulled by the eccentric cam portion 13b in the drive mechanism 10 to repeatedly perform the forward and backward movements as described above, thereby performing a reciprocating motion in the reciprocating motion direction RD. It should be noted that on the front side (front view surface) of the drive mechanism 10, a bracket portion 15 facing the front opening portion 20a of the pump main body 20 is provided to mount the adapter member 40 described below.

[0070] In addition, the drive mechanism 10 is not limited to the structure having the motor 12 and the eccentric cam mechanism 13 described above as long as its structure can drive the shaft member 11 at least in the forward or backward direction of the diaphragm 50. For example, it may also be a structure that employs an actuator or the like that directly drives the shaft member 11 using, for example, electromagnetic force.

[0071] The housing portion of the pump main body 20 is formed of, for example, a resin member. The pump main body 20 has: a front opening portion 20a provided on the front side, and a pump base 20b. In addition, the pump main 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 main body 20 is formed, for example, in a cylindrical shape with a part of the upper and lower portions being parallel planes, and is configured such that a part thereof (for example, the lower side) communicates with the inside of the pump base 20b. In the storage space 21, the drive mechanism 10 is mainly stored, and a cable portion 19 as a wiring and the bracket portion 15 described above are also stored.

[0072] In addition, the pump main body 20 has a rear wall 22 provided on the rear side. On the back surface (rear surface) 22a of the rear wall 22, a control board 29 connected to the cable portion 19 is mounted. It should be noted that Figure 1 the illustration of the intermediate path of the cable portion 19 is omitted. The control board 29 controls the drive mechanism 10 and controls the operation of the entire pump device 100.

[0073] The control board 29 includes a detection portion 29a (refer to Figure 7 ) described below, and the detection portion 29a is used to judge the breakage of the diaphragm 50 by detecting, for example, the leakage of the fluid to be transported. It should be noted that an operation portion 28 for an operator to perform setting operations and the like of the pump device 100 is provided on the rear side of the pump main body 20.

[0074] [Structure of the pump head]

[0075] The pump head 30 is formed of, for example, a resin member or a metal member 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 a diaphragm 50 attached to the pump head 30, and its volume changes as the diaphragm 50 displaces. It should be noted that in the pump device 100 of the present embodiment, on the front side of the pump head 30, for example, a reinforcing plate 30a for strengthening the mechanical strength of the pump head 30 and a cover member 30b for protecting the reinforcing plate 30a are attached.

[0076] The pump head 30 is attached to the front opening 20a side of the pump body 20 through an adapter member 40 attached to a bracket portion 15 of the drive mechanism 10, for example. The pump head 30 has a suction port 32 and a discharge port 33 for delivering fluid that communicate with the pump chamber 31. The suction port 32 communicates with the lower part of the pump chamber 31, for example. The discharge port 33 communicates with the upper part of the pump chamber 31, for example.

[0077] In the pump head 30, a first connection port 34 is formed below the suction port 32 and on the suction side of the fluid to be delivered. Further, in the pump head 30, a second connection port 35 is formed above the discharge port 33 and on the discharge side of the fluid to be delivered. These first connection port 34 and second connection port 35 communicate with the pump chamber 31 through the suction port 32 and the discharge port 33, respectively.

[0078] On the first connection port 34, a cylindrical suction-side adapter 37 is connected through a connection nut 37a with a suction valve 36a assembled thereto. On the second connection port 35, a cylindrical discharge-side adapter 38 is connected through a connection nut 37b with a discharge valve 36b assembled thereto. 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.

[0079] [Structure of Adapter Member]

[0080] Figure 4 It is an explanatory view showing the adapter member of the pump device, where Figure 4 (a) is a front view of the adapter member, Figure 4 (b) is a sectional view of the adapter member.

[0081] The adapter member 40 is formed of a resin member, for example. 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, as Figure 2 and Figure 4(a) As shown, it has a plurality of mounting holes 41 arranged at a prescribed pitch. In addition, the adapter member 40 has a plurality of through holes 42 arranged at a prescribed pitch different from that of the plurality of mounting holes 41.

[0082] The adapter member 40 is fixed to the bracket portion 15 by fastening means such as bolts (not shown) inserted into the mounting holes 41. Thus, the adapter member 40 is mounted on the pump body 20 so as to block the front opening 20a of the pump body 20. Then, for example, by fastening a bolt 42a passing through the insertion hole 42 of the reinforcing plate 30a and the adapter member 40 to 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.

[0083] The adapter member 40, for example, as Figure 4 (b) As shown, has: an annular convex portion 43 that serves as a pressing portion for clamping the fixing portion 51 (refer to Figure 1 ) of the diaphragm 50 located at the outer peripheral portion between the pump head 30; and a wall portion 44 having a first wall surface 44a. And in the adapter member 40, a concave space portion 45 is formed by the inner peripheral wall surface 43a of the annular convex portion 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, for example, by adjusting the depth dimension of the pump head 30 of the portion for mounting the diaphragm 50, etc., the portion of the adapter member 40 corresponding to the annular convex portion 43 can be formed into a planar shape. In this case, this planar portion can serve as the pressing portion, so the diaphragm 50 is pressed against the pump head 30 by this pressing portion, and the two can also be mounted in a liquid-tight sealed manner. Therefore, the pressing portion is not limited to the annular convex portion 43.

[0084] A circular central hole portion 46 is formed at the center of the wall portion 44 of the adapter member 40. In addition, for example, as Figure 4 (a) As shown, on the wall portion 44 around the central hole portion 46 of the adapter member 40, a pair of connection hole portions 47 are formed. Each connection hole portion 47, for example, has a hole shape in which a circular hole and a rectangular hole are combined with the circular hole as the center, and the rectangular hole portions are arranged to be inclined so that they approach each other from the lower end to the upper end.

[0085] In addition, on the first wall surface 44a below the central hole portion 46, a pair of guide frames 47a are formed, which can guide the front end side portion of the electrode portion 48 described below. It should be noted that on the adapter member 40, a drain hole 47b that penetrates a part of the annular convex portion 43 to communicate with the space portion 45 from the outside is formed, and a drain bolt 47c (refer to Figure 2 ) is installed in the drain hole 47b.

[0086] [Structure of the washer member]

[0087] Figure 5 is an explanatory view showing a gasket member mounted on an adapter member, where Figure 5 (a) is a front view of the gasket member, Figure 5 (b) is a sectional view of the gasket member.

[0088] The gasket member 60 is formed of rubber, for example. The gasket member 60 is mounted on the second wall surface 44b (see Figure 4 (b)) of the wall portion 44 of the adapter member 40, which is on the side opposite to the space portion 45. The gasket member 60, for example, as Figure 5 (a) shows, has: a disk portion 61, and a central convex portion 62 provided at the center of the disk portion 61 and having an uneven shape (serpentine shape in a direction intersecting the reciprocating motion direction RD) in the reciprocating motion direction RD. 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 convex portion 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 to the space portion 45.

[0089] In addition, the gasket 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 convex portion 62, and the shaft member 11 (see Figure 2 ) is inserted therein in a liquid-tight sealed manner. The pair of second hole portions 64 are formed at positions in the disk portion 61 corresponding to the pair of connection hole portions 47 of the adapter member 40 in the reciprocating motion direction RD when mounted on the adapter member 40. And each second hole portion 64 has a hole shape formed to be the same as the hole shape of the connection hole portion 47 of the adapter member 40 described above. In addition, the arrangement of each second hole portion 64 is the same as the arrangement of each connection hole portion 47 of the adapter member 40 described above.

[0090] It should be noted that, as Figure 4 (a) and Figure 5 (a) show, the pair of connection hole portions 47 of the adapter member 40 and the pair of second hole portions 64 of the gasket member 60 are arranged, for example, at positions having the same height as the central hole portion 46 in the horizontal direction or at positions higher than that position.

[0091] [Structure of Diaphragm]

[0092] As Figure 1 shows, the diaphragm 50 is connected to the shaft member 11 inserted into the first hole portion 63 of the central convex portion 62 of the gasket member 60. The diaphragm 50 is a member in which an insertion bolt 52 is integrally formed inside resins such as ethylene propylene rubber (EPDM) and polytetrafluoroethylene (PTFE), for example.

[0093] The diaphragm 50 is driven along the reciprocating direction RD by a drive 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 seal state with the fixing portion 51 clamped between the pump head 30 and the annular convex portion 43 of the adapter member 40 and the front side of the central portion 53 facing the pump chamber 31. It should be noted that a retainer 54 for maintaining the shape of the diaphragm 50 and holding the position of the diaphragm 50 is arranged, for example, between the front end of the shaft member 11 and the diaphragm 50.

[0094] And, after installing the Figure 5 washer member 60 shown in Figure 4 on the adapter member 40 shown in Figure 2 and Figure 3 shown, on the wall portion 44 of the adapter member 40, as shown in

[0095] [Structure of the electrode portion]

[0096] A pair of electrode portions 48 are installed, for example, on 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 a portion corresponding to a pair of connection hole portions 47 (not shown) in the space portion 45, and while bending along the inner peripheral wall surface 43a of the annular convex portion 43, extend downward in the space portion 45 in a manner approaching each other, and the front ends thereof are arranged at positions facing each other with a predetermined gap therebetween. The front end portions of each of the pair of electrode portions 48 are held by respective guide frames 47a.

[0097] The pair of electrode portions 48 are formed of, for example, a conductive resin or a corrosion-resistant metal that is formed to be linearly symmetric with respect to a vertical axis passing through the center axis of the central hole portion 46 and is plate-shaped. Here, as the conductive resin, for example, modified polyphenylene ether (m-PPE) containing carbon fiber (CF), polypropylene (PP), polyamide (PA), etc. can be cited respectively. In addition, as the corrosion-resistant metal, for example, stainless steels such as SUS304, SUS316, SUS316L, nickel, titanium, alloys such as Alloy20, AlloyB2, AlloyC276, and metals such as gold, platinum, silver, copper, brass, and aluminum can be cited.

[0098] [Structure of the connector portion]

[0099] On the other hand, the pair of connector portions 70 are formed of, for example, the above-mentioned conductive resin and are installed on the second wall surface 44b side of the wall portion 44 of the adapter member 40. Specifically, after the pair of connector portions 70 clamp and install the disk portion 61 of the washer member 60 on the second wall surface 44b, they are respectively connected to the pair of electrode portions 48. The electrode portion 48 and the connector portion 70, as shown inFigure 3 As shown, for example, they are connected by a connecting screw 69, which is a connecting component that electrically connects them to each other.

[0100] Figure 6 It is an explanatory diagram showing the connector portion 70, where 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 sectional view of the connector portion 70. Figure 7 It is a block diagram showing the circuit structure for detecting breakage of the detection diaphragm of the pump device.

[0101] As Figure 6 (a) to Figure 6 (c) shows, each connector portion 70 has: a main body portion 71, a pair of claw portions 72, and a cylindrical portion 73. The main body portion 71 has a plate-like portion 71a and a cylindrical portion 71b. As Figure 3 shown, the plate-like portion 71a is pressed against the disk portion 61 of the washer member 60. In the cylindrical portion 71b, a connection hole 71c is formed for inserting a connection pin 19a, which is an electrical connection portion of the cable portion 19.

[0102] A pair of claw portions 72 project from the plate-like portion 71a of the main body portion 71 toward the side opposite to the side where the cylindrical portion 71b is formed. The pair of claw portions 72 has: a second hole portion 64 passing through the washer member 60 and a connection hole portion 47 of the adapter member 40, and an engaging portion that engages with the first wall surface 44a of the wall portion 44.

[0103] The cylindrical portion 73 is provided between the pair of claw portions 72. In the cylindrical portion 73, a connection member mounting hole portion 73a is formed, and the connection screw 69 can be mounted together with the electrode portion 48 in the connection member mounting hole portion 73a. It should be noted that at the position where the pair of electrode portions 48 are connected to the connector portion 70, a through hole 48a is provided, and the connection screw 69 is inserted into the through hole 48a toward the connection member mounting hole portion 73a.

[0104] Each connector portion 70 is matched to the shape of the connection hole portion 47 of the adapter member 40 and the second hole portion 64 of the washer member 60, and is installed in such a way that the hole direction of the connection hole 71c formed in the cylindrical portion 71b of the main body portion 71 is inclined upward toward the central hole portion 46. Thereby, the operation of inserting the connection pin 19a of the cable portion 19 into the connection hole 71c becomes easy.

[0105] By connecting the electrode portion 48 and the connector portion 70 with the connection screw 69 in this way, as Figure 7As shown, the electrode portions 48 are electrically connected to the detection portion 29a of the control substrate 29 through the cable portions 19, respectively. In addition, since the connector portion 70 is mounted on the adapter member 40 with the gasket member 60 interposed therebetween, the leakage liquid of the fluid being conveyed does not penetrate from the space portion 45 side of the adapter member 40 to the second wall surface 44b side of the wall portion 44.

[0106] [Effects of the First Embodiment]

[0107] In the pump device 100 of the first embodiment, as Figure 1 shown, if the diaphragm 50 is damaged, the fluid being conveyed leaks from the pump chamber 31 side to the space portion 45 side of the adapter member 40 and gradually accumulates below as the leakage liquid F. As a result, the resistance value between the pair of electrode portions 48 in the space portion 45 changes. Therefore, the detection portion 29a detects the presence of the leakage liquid F based on this and detects the damage of the diaphragm 50.

[0108] Therefore, the diaphragm 50 can use a low-cost single-layer diaphragm instead of an expensive multi-layer diaphragm, and the electrode portions 48 and the connector portion 70 can also be formed at low cost. Thus, the damage of the diaphragm 50 can be detected 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 symmetric plate-like manner as described above, and the front end side portion of the electrode portion 48 is guided by the guide frame 47a. Therefore, the distance between the electrodes can be accurately set, and the detection accuracy of the change in the resistance value is high.

[0109] In addition, since the electrode portion 48 has the above-described shape and is connected to the connector portion 70 through the connection hole portion 47 and the second hole portion 64 with the connection screw 69 in the above-described positional relationship, a structure can be obtained in which the leakage liquid F accumulated in the space portion 45 does not leak to the second wall surface 44b side before the leakage liquid F in the space portion 45 is detected.

[0110] [Second Embodiment]

[0111] Figure 8 is a front view showing an adapter member assembled on the pump main body of the pump device according to the second embodiment of the present invention. Figure 9 is a front view showing a drive mechanism housed in the pump main body of the pump device. Figure 10 is Figure 8 an enlarged sectional view taken along line B - B' of Figure 11 is an explanatory view showing the second conductive member of the pump device, where Figure 11 (a) shows the front view, Figure 11 (b) shows the top view. It should be noted that hereinafter, repeated descriptions of parts that have already been described will be omitted.

[0112] The pump device according to the second embodiment mainly differs from the pump device 100 of the first embodiment 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, a structure is adopted in which the adapter member 40 is only connected to the bracket portion 15 of the drive mechanism 10 and mounted on the pump body 20, and the cable portion 19 can be electrically connected to the electrode portion 48A.

[0113] Therefore, it is not necessary to perform the operation of inserting the connection pin 19a of the cable portion 19 into the connection hole 71c of the connector portion 70 and connecting it before mounting the adapter member 40 on the pump body 20 as in the first embodiment. To achieve such a structure, in the second embodiment, as Figure 11 (a) and Figure 11 (b) show, the contact plate 70A as the second conductive member is formed of a metal material, for example.

[0114] The contact plate 70A has a plate-shaped main body portion 71A and a leaf spring-shaped electrical contact portion 74. As Figure 10 shows, the main body portion 71A presses the washer member 60 against the second wall surface 44b of the wall portion 44 of the adapter member 40, and at the same time has a through hole 76 through which the connection screw 69 is inserted. In addition, the main body portion 71A has a pair of cutout portions 75 that fit with positioning convex portions (not shown) formed on the washer member 60 for positioning the contact plate 70A during installation.

[0115] The electrical contact portion 74 turns back from the main body portion 71A toward the pump body 20 side and elastically contacts the contacted screw 19b as the electrical connection portion of the cable portion 19, as Figure 9 and Figure 10 show. It should be noted that the cable portion 19, as Figure 9 shows, passes through a lead-out hole portion 15f provided in a part (the upper side in the illustrated example) of the bracket portion 15 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 crimp terminal 19g is connected to the front end side of the cable portion 19, and by connecting and fixing the crimp terminal 19g to a part of the bracket portion 15 via a rubber bushing 19f using the contacted screw 19b, the end processing of the cable portion 19 is completed.

[0116] The pair of electrode portions 48A, as Figure 8As shown, it 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, instead of the through-hole 48a as in the previous example, the electrode portion 48A is formed with a flat front side structure. Instead of the through-hole 48a, as Figure 10 shown, an insertion portion 77 having a connection member mounting hole portion 48Aa is formed on the electrode portion 48A.

[0117] The connection screw 69 inserted through the through-hole 76 of the contact plate 70A is mounted on the connection member mounting 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 mounted from the second wall surface 44b side of the wall portion 44 of the adapter member 40, the electrode portion 48A is electrically connected and fixed to the contact plate 70A by passing the connection screw 69 through the through-hole 76 and the second hole portion 64a and mounting it in the connection member mounting hole portion 48Aa.

[0118] After that, if the Figure 8 shown adapter member 40 is mounted on the bracket portion 15 of the drive mechanism 10 as described above, then as Figure 9 shown, the electrical contact portion 74 of the contact plate 70A elastically contacts the contact screw 19b. Thus, the electrode portion 48A is electrically connected to the control substrate 29 through the cable portion 19. Figure 10 In this way, in the second embodiment, just by mounting the adapter member 40 on the pump main body 20, the cable portion 19 can be electrically connected to the electrode portion 48A, so there is no need for an additional operation of connecting the cable portion 19, which can improve the connection operability of the cable portion 19, and also improve the assemblability and maintainability of the pump device.

[0119] [Third Embodiment]

[0120] FIG. is a front view showing an adapter member assembled on the pump main body of the pump device according to the third embodiment of the present invention.

[0121] Figure 12 FIG. is a front view showing a drive mechanism housed in the pump main body of the pump device. Figure 13 FIG. is an enlarged sectional view taken along the line C-C' of Figure 14 FIG. Figure 12 . Figure 15 FIG. is an explanatory view showing the second conductive member of the pump device, where Figure 15 (a) shows the front side, Figure 15 (b) shows the bottom (looking up), Figure 15 (c) shows the back side.

[0122] The pump device according to the third embodiment mainly differs from the pump device of 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 crimp terminal 19g on the front end side is connected and fixed to a part of the bracket portion 15 via a rubber bushing 19f using a contact screw 19b. In contrast, in the third embodiment, instead of leading out the cable portion 19 to the front side of the bracket portion 15 and using the contact screw 19b for screwing and fixing, a structure of electrically connecting to the electrode portion 48A is adopted.

[0123] Therefore, it is not necessary to perform the operation of screwing and fixing the crimp terminal 19g of the cable portion 19 with the contact screw 19b after wiring the cable portion 19 on the front side of the bracket portion 15 as in the second embodiment, and the assemblability is significantly improved. To adopt this structure, in the third embodiment, first, as Figure 15 (a) to Figure 15 (c) show, the second conductive member is set to a contact plate 70B made of, for example, a metal material, which is the same as the contact plate 70A of the second embodiment.

[0124] The contact plate 70B, like the contact plate 70A, has a structure with a plate-shaped main body portion 71B and a leaf spring-shaped electrical contact portion 74a. The main body portion 71B, as Figure 14 shown, presses the washer member 60 against the second wall surface 44b of the wall portion 44 of the adapter member 40. In addition, the main body portion 71B has a through hole 76 for inserting the connection screw 69 and a pair of cutout portions 75. The function and effect of the pair of cutout portions 75 are the same as those described above.

[0125] The electrical contact portion 74a, like the electrical contact portion 74 of the contact plate 70A, is formed to fold back from the main body portion 71B toward the pump main body 20 side. The electrical contact portion 74a elastically contacts the metal bushing 79 (refer to Figure 13 ) which is the electrical connection portion of the cable portion 19. The metal bushing 79, as Figure 14 shown, is, for example, composed of a circular plate-shaped contact portion 79a and a cylindrical connection portion 79b that is smaller in diameter than it and has a connection hole 79c formed inside, and stands up from the center of the contact portion 79a.

[0126] The cable portion 19 with the connection pin 19a installed on the front end side, as Figure 14As shown, first, it is inserted into the mounting hole portion 15g formed in a part of the bracket portion 15 (in the illustrated example, at a position horizontal to the central axis of the drive mechanism 10) from the back side (the back side) of the bracket portion 15. Then, for the cable portion 19, on the front side of the bracket portion 15, the connecting pin 19a is inserted into the connecting hole 79c of the connecting portion 79b of the metal bushing 79, thereby connecting to the metal bushing 79.

[0127] Next, a rubber bushing 19f that covers the entire surface 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 and the rubber bushing 19f together are inserted into the mounting hole portion 15g from the front side of the bracket portion 15, and thus the installation of the metal bushing 79 to the bracket portion 15 and the wiring operation of the cable portion 19 are completed. The metal bushing 79 installed in this way is electrically insulated from the bracket portion 15 (and the drive mechanism 10) by the rubber bushing 19f.

[0128] In this way, in the third embodiment, compared with the second embodiment, a method of connecting by inserting the connecting pin 19a of the cable portion 19 into the connecting hole 79c of the metal bushing 79 is adopted, so there is no need to perform the operation of screwing and fixing to the bracket portion 15 using the contact screw 19b, improving the assemblability. In addition, since the surface side of the contacted portion 79a of the metal bushing 79 is planar, the contact surface is wider and larger compared with the contact screw 19b, and thus the reliability of the electrical connection with the electrical contact portion 74a of the contact plate 70B is also improved.

[0129] It should be noted that the method and structure of mounting the pair of electrode portions 48A to the adapter member 40, and the connection method of the electrode portion 48A and the contact plate 70B achieved by mounting the adapter member 40 to the bracket portion 15 are the same as those in the second embodiment, so the description is omitted here.

[0130] Several embodiments of the present utility model have been described above, but these embodiments are presented as examples and are not intended to limit the scope of the utility model. 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 utility model. These embodiments and their modifications are included in the scope and gist of the utility model, and at the same time are included in the utility model described in the patent claims and its equivalent scope.

[0131] For example, in the above-described embodiment, as described above, the electrode portions 48, 48A are in the shape of linearly symmetric plates that extend downward from the position corresponding to the connection hole portion 47 and extend while being bent along the inner peripheral wall surface 43a and approaching each other. In addition to these, the electrode portions 48, 48A may have various shapes as long as they can come into contact with the leaked liquid F of the transported fluid within the space portion 45.

[0132] In addition, the connection method between the connector portion 70 and the contact plates 70A, 70B and the cable portion 19 is not limited to the above-described method as long as they are electrically connected respectively. In addition, although in the above-described embodiment, the case where the electrode portions 48, 48A are electrically connected to the cable portion 19 through the connector portion 70 and the contact plates 70A, 70B has been described, it is not limited thereto, and the cable portion 19 may be directly connected to the electrode portions 48, 48A without passing through these connector portion 70 and contact plates 70A, 70B, etc.

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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