JP5302176B2 - Diaphragm pump for fluid - Google Patents

Description

  The present invention relates to a diaphragm pump for fluid.

  As a conventional diaphragm pump, as already proposed by the present inventor, a diaphragm assembly in which a plurality of diaphragms forming a pump chamber are integrally formed, a plurality of umbrella-shaped valve bodies, and an umbrella-shaped valve body are attached. There is known one having an inner lid (see Patent Document 1).

JP 2009-41538 A

  However, when an umbrella-shaped valve body is used, there are problems such as an increase in the number of parts, an assembling work, and a high risk of loss or damage during the work. Furthermore, there is a problem that the manufacturing cost becomes high. Further, in order to prevent interference between the diaphragm and the umbrella-shaped valve element in the pump chamber, it is necessary to enlarge the pump chamber, and there is a problem that it is difficult to downsize the entire diaphragm pump. Further, by using a plurality of small umbrella-shaped valve bodies, there are problems that failure is likely to occur, operation reliability is low, and noise during opening and closing operations.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fluid diaphragm pump that is small in size, easy to assemble, has an excellent on-off valve stability and reliability, and has a low noise and long life.

  In order to achieve the above object, a diaphragm pump for fluid according to the present invention is a short diaphragm formed by extending a vertical diaphragm in one axial direction and an opening edge of the diaphragm in one axial direction. A diaphragm assembly having a cylindrical discharge valve membrane portion, a diaphragm portion having a plane orthogonal to the axis center connecting the plurality of diaphragms integrally in a circumferentially equal distribution, a plate portion having a plane orthogonal to the axis center, and A suction valve membrane assembly having a plurality of short cylindrical suction valve membranes projecting from the flat plate portion to the circumference equally distributed in the axial center, and between the diaphragm assembly and the suction valve assembly. A cylindrical discharge valve seat portion that is in contact with the outer peripheral surface so that the discharge valve membrane portion is in close contact with the outer peripheral surface, and is disposed concentrically with the discharge valve seat portion so that the suction valve membrane is in close contact with and separated from the outer peripheral surface. An inner lid body having a circular suction valve seat portion in contact therewith Those were.

Also, an annular groove is formed between the cylindrical discharge valve seat and the circular suction valve seat, and the suction valve membrane is inserted into the annular groove. .
The inner lid body is provided with an annular positioning convex portion that is concentric with the suction valve seat portion and projects in one axial direction, and is recessed in the suction valve membrane assembly concentrically with the suction valve membrane. An annular positioning recess is provided in which the positioning protrusion is inserted.
Further, the flat plate portion of the intake valve membrane assembly is provided with a ridge portion that is in close contact with the inner lid and partitions the atmosphere side, the high pressure side, and the low pressure side in a sealed manner.

  According to the diaphragm pump for fluid of the present invention, the number of parts can be reduced, the number of manufacturing steps and assembly steps of members can be reduced, and the manufacturing cost can be reduced easily and quickly. The length in the longitudinal direction (axial direction) of the entire pump can be shortened and the size can be reduced. Moreover, the diaphragm pump for fluids with low noise can be obtained. And the reliability of operation | movement as a pump becomes high and lifetime is also extended significantly.

It is a disassembled perspective view which shows embodiment of this invention. It is a principal part disassembled perspective view which shows embodiment of this invention. It is a perspective view which shows an example of a diaphragm assembly. It is a front view which shows an example of an inner cover body. It is a rear view which shows an example of an inner cover body. It is the perspective view which looked at an example of the suction valve membrane assembly from the other direction side. It is a rear view which shows an example of a cover body. It is principal part sectional drawing which shows embodiment of this invention.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
1 and 2, the fluid diaphragm pump of the present invention includes a cover 1 having a small cylindrical suction port 10 and a discharge port 15 projecting in one axial direction L1, and the other direction of the axial center. A suction valve membrane assembly 2 having three short cylindrical suction valve membranes 22 projecting to L2, a diaphragm assembly 5 having three vertical diaphragms 50 opened in one axial direction L1, and a suction valve membrane assembly 2; An intermediate lid 3 interposed between the diaphragm assemblies 5 and a retainer member (support member) 6 that contacts and supports the diaphragm assembly 5 from the axial center other direction L2 side are provided.

  In the present invention, the central axis of the entire fluid diaphragm pump is referred to as an axis L. Moreover, the arrow L1 direction side along the axial center L is called the axial center one direction L1. The opposite direction of the axial center direction L1 is referred to as the axial center other direction L2.

  2 and 3, the diaphragm assembly 5 includes a short cylindrical discharge valve membrane 52 formed by extending an opening edge of a bowl-shaped diaphragm 50 in one axial direction L1, and an axial center L. And a diaphragm portion 54 having a plane orthogonal to the axial center and integrally connecting three diaphragms 50 disposed at intervals of 120 degrees in the circumferential direction. Further, a diaphragm driving unit 53 capable of compressing and expanding the diaphragm 50 by reciprocating motion (piston motion) is provided so as to protrude from the diaphragm 50 in the other direction L2 of the axial center. The diaphragm assembly 5 is integrally formed from an elastic member such as rubber.

  In FIG. 3, the diaphragm portion 54 has a sealing bulge strip portion 59 formed along the outer peripheral edge on the surface (represented by the surface 54 a) on one side in the axial center direction L <b> 1 in a closed ring shape. . Note that, as shown in FIG. 8, the bulging strip portion 59 is compressed by the inner lid body 3 and thus elastically deforms to the same thickness as the diaphragm portion 54. 8 is a cross-sectional view taken along a cutting line SS shown by a one-dot chain line in FIG.

  1, 6, and 8, the suction valve membrane assembly 2 includes a flat plate portion (flat membrane portion) 24 having a plane orthogonal to the axial center and a discharge penetrating through the flat plate portion 24 with the axial center L as a center. A hole 26, three suction holes 21 penetrating the flat plate portion 24 at intervals of 120 degrees in the circumferential direction around the axis L, and an opening edge portion of the suction hole 21 extending in the other direction L 2 of the axis. It has a short cylindrical intake valve membrane 22 and an annular positioning recess 23 that is concentric with the intake valve membrane 22 (and in one axial direction L1). The intake valve membrane assembly 2 is integrally formed from an elastic member such as rubber.

Further, the flat plate portion 24 of the suction valve membrane assembly 2 is in close contact with the inner lid body 3 on the surface (rear surface 24b) on the other side of the axial center L2 side so as to seal the atmosphere side, the high pressure side, and the low pressure side in a sealed manner. A ridge portion 29 is provided.
The ridge portion 29 is formed in a closed ring shape along the outer peripheral edge of the flat plate portion 24, and is formed so as to surround the outer ridge portion 29a that seals the atmosphere side, the low pressure side, and the high pressure side in a sealed manner, and the discharge hole 26. It is formed in an annular shape and includes an inner ridge 29b that seals the low pressure side and the high pressure side in a sealed manner. As shown in FIG. 8, the ridge portions 29 (29 a and 29 b) are compressed by the inner lid body 3 and elastically deformed to the same thickness as the flat plate portion 24.

In FIG. 1, the flat plate portion 24 of the suction valve membrane assembly 2 is in close contact with the lid body 1 on the surface (indicated by the surface 24 a) in the axial direction L 1, and is connected to the atmosphere side, the high pressure side, and the low pressure side. It has a protrusion 28 that is hermetically partitioned.
The protruding portion 28 is formed in a closed ring shape along the outer peripheral edge of the flat plate portion 24, and is formed in an annular shape so as to surround the discharge hole 26 and the outer protruding portion 28a that seals the atmosphere side and the low pressure side in a sealed manner. And an inner protrusion 28b that seals the low-pressure side and the high-pressure side in a sealed manner. As shown in FIG. 8, the protrusions 28 (28 a, 28 b) are compressed by the lid body 1 and elastically deformed to the same thickness as the flat plate part 24.

In FIGS. 4, 5, and 8, the inner lid 3 is a short cylindrical resin molded product, and has a discharge hole 36 extending through the axis L. Further, a discharge path 39 having a circular recess communicating with the discharge hole 36 is provided on the surface (back surface 3b) on the other side L2 side of the axial center.
The discharge path 39 is provided with three bottomed cylindrical portions 30 that are disposed at intervals of 120 degrees in the circumferential direction around the axis L and that open in one axial direction L1 (surface 3a). ing.

The cylindrical wall portion of the bottomed cylindrical portion 30 is used as a discharge valve seat portion 35 in which the inner peripheral surface of the discharge valve membrane portion 52 is in close contact with and freely separated.
Further, a projecting portion 31 that protrudes in the axial direction L1 from the bottom wall portion 30b of the bottomed cylindrical portion 30 and has a circular outer cross-section is provided. The projecting portion 31 is a suction valve seat portion 32 with which the inner peripheral surface of the suction valve membrane 22 comes into close contact and separability. The protruding portion 31 is not limited to the illustrated cylindrical shape, and may be a columnar shape.

  A suction valve seat portion 32 is disposed concentrically with the discharge valve seat portion 35 to form an annular groove 34 that opens in one axial direction L1. Further, a through hole 38 communicating with the annular groove 34 is provided in the bottom wall portion 30 b of the bottomed cylindrical portion 30. For example, three through holes 38 are arranged at intervals of 120 degrees in the circumferential direction around the central axis of the suction valve seat portion 32.

  Further, the inner lid body 3 protrudes in the axial direction L1 from the surface 3a and is formed concentrically with the intake valve seat 32, and is inserted into the positioning recess 23 of the intake valve membrane assembly 2 to form an annular position. Convex portion 33 is provided.

  In FIGS. 1 and 8, the lid 1 is a resin molded product, and a discharge passage 16 for discharging a fluid is provided around the axis L as a center. A part of the discharge path 16 is formed in the small cylindrical discharge port portion 15. In addition, a suction passage 11 is provided in the eccentric position with respect to the shaft center L in order to suck fluid. A part of the suction path 11 is formed in the small cylindrical suction port portion 10.

  Further, in FIG. 7, the lid body 1 is a suction passage that is formed in a ring shape so as to communicate with the suction passage 11 and to surround the discharge passage 16 on the surface (back surface 1 b) on the other side of the axial center L 2. 12 is formed. The suction passage 12 and the discharge passage 16 are separated by an annular partition wall 17.

The suction passage 12 is provided with three C-shaped support wall portions 18 projecting in the axial direction L2 so as to hold down (support) the suction valve membrane assembly 2.
The support wall 18 is formed in a C shape by cutting out a part of an annular wall formed concentrically with the suction hole 21 of the suction valve membrane assembly 2 in the assembled state.

  Further, the partition wall portion 17 and the support wall portion 18 protrude to a position that is flush with the back surface 1b. In other words, while ensuring a volume (flow path) capable of sufficiently flowing fluid to the suction passage 12, the flat plate portion 24 of the suction valve membrane assembly 2 is securely pressed, and the operation of the suction valve membrane 22 is made more stable. doing. In FIG. 7, the partition wall portion 17 and the wall portions near the axis L of the three support wall portions 18 are integrally formed (a part of the wall portion is used together). It is also desirable to increase the volume of the suction path 12 by separating the partition wall 17 and the three support walls 18.

  The support wall portion 18 is formed in nine arcs, and the three support wall portions 18, 18, 18 are pressed by the three support wall portions 18, 18, 18 so that the vicinity of the opening peripheral edge portion of one suction hole 21 is pressed. 18 and 18 may be arranged concentrically in one suction hole 21 and arranged at intervals of 120 degrees in the circumferential direction around the central axis of the suction hole 21.

  1 and 8, the retainer member 6 is a resin molded product and has a flat surface 6 a that is in contact with and supported by the back surface 54 b of the diaphragm portion 54 of the diaphragm assembly 5. . Moreover, it has a through hole 61 through which the diaphragm 50 is inserted.

  In addition, an inclined rocking plate 70 having a locking hole 70a for holding the diaphragm driving unit 53, a cylindrical small DC motor 74, and a bottom with a bottom attached to the output shaft 74a side of the motor 74. A cylindrical cup-shaped case member 73, an eccentric rotating body 72 having an eccentric hole 72a in which the output shaft 74a is inserted at the center and disposed at an eccentric position from the output shaft 74a, one of which is the center of the swing plate 70 And a shaft member 71, the other of which is inserted into the eccentric hole 72a in an inclined manner.

  In the assembled state, the lid body 1, the suction valve membrane assembly 2, the inner lid body 3, the diaphragm assembly 5, and the retainer member 6 are sequentially stacked on the case member 73 and the screw member 75 is inserted in a skewered manner. A cylindrical casing 9 having an internal space is formed by being screwed to the case member 73. Further, in the case member 73, the rocking plate 70 rotates and swings by the rotation of the output shaft 74 a to reciprocate the diaphragm driving unit 53, and the diaphragm 50 and the bottomed cylindrical portion 30 of the inner lid body 3 The formed pump chamber 7 is configured to be compressed and expanded.

The operation of the above-described fluid diaphragm pump of the present invention will be described.
In the assembly process, the lid body 1, the suction valve membrane assembly 2, the inner lid body 3, the diaphragm assembly 5, and the retainer member 6 are sequentially stacked, and the screw member 75 is inserted in a skewered manner to be screwed into the case member 73. The casing 9 is formed by wearing. Further, three pump chambers 7 surrounded by the diaphragm 50 and the inner lid 3 are formed. Further, a suction flow path including a suction path 11, a suction path 12, a suction hole 21, an annular groove 34, and a through hole 38 is formed on the side of the axial direction L 1 from the retainer member 6, and a suction valve membrane 22 is formed. And a suction valve seat portion 32 are interposed in the suction flow path. In addition, a discharge flow path including a discharge path 16, a discharge hole 26, a discharge hole 36, and a discharge path 39 is formed on the side of the axial direction L1 from the retainer member 6, and a discharge valve film portion 52 and a discharge valve seat portion. 35 is formed. Further, the three annular concave grooves 34 are not in communication with each other, and can communicate with the suction passage 12 through the suction valve. In addition, the annular groove 34 communicates with the corresponding pump chamber 7 through the through hole 38. Further, the swing plate 70, the shaft member 71, the eccentric rotating body 72, and the motor 74 cause the swing plate 70 to swing by the rotation of the output shaft 74a, reciprocate the diaphragm drive unit 53, and compress and expand the diaphragm 50. Can be assembled as possible.

  Here, when the suction valve membrane assembly 2 and the inner lid 3 are overlapped, the inner peripheral surface of the suction valve membrane 22 is inserted along the outer peripheral surface of the suction valve seat portion 32, so that the suction is performed in the annular groove 34. The valve membrane 22 is stored easily and smoothly. Then, by inserting (inserting) the positioning convex portion 33 into the positioning concave portion 23, the suction valve membrane 22 and the suction valve seat portion 32 are disposed concentrically, and the inner peripheral surface of the suction valve membrane 22 and the suction valve seat are arranged. The outer peripheral surface of the part 32 is brought into close contact with each other, and the suction valve is reliably formed. Further, the suction valve membrane 22 and the discharge valve membrane portion 52 are disposed concentrically. That is, the suction valve membrane assembly 2 and the inner lid 3 are appropriately positioned and assembled.

  In addition, the ridge 29 of the suction valve membrane assembly 2 is compressed and adhered to the surface 3 a of the inner lid 3, and the protrusion 28 is compressed and adhered to the rear surface 1 b of the lid 1, so that the diaphragm assembly 5 The bulging strip portion 59 is compressed and closely adhered to the back surface 3b of the inner lid body 3, and the outside (atmosphere side) and the inside of the casing 9 (low pressure side and high pressure side) are hermetically sealed, and the inside of the casing 9 has a low pressure. The side (suction channel) and the high pressure side (discharge channel) are partitioned in a sealed manner.

When the motor 74 is driven after assembly, the swing plate 70 rotates and swings. As the swing plate 70 swings, the diaphragm drive unit 53 sequentially reciprocates.
When the pump chamber 7 expands from the compressed state, the inside of the pump chamber 7 has a negative pressure, and the fluid attracted by the negative pressure separates (separates) the suction valve membrane 22 from the suction valve seat portion 32 in an expanded shape. The suction passage 12 and the pump chamber 7 are opened. Due to the negative pressure action, the fluid flows through the suction channel and flows into the pump chamber 7.
Further, the discharge valve film portion 52 is sucked and pressed into close contact with the discharge valve seat portion 35 by a negative pressure. Intrusion of fluid from the discharge path 39 to the pump chamber 7 is prevented.

  Next, when the pump chamber 7 is compressed by the reciprocating motion of the diaphragm drive unit 53, the fluid in the pump chamber 7 presses the discharge valve film portion 52 and separates from the discharge valve seat portion 35 so as to expand in diameter. As a result, the discharge passage 39 and the pump chamber 7 are opened, and the fluid in the pump chamber 7 is discharged from the discharge passage 16. Further, due to the compression of the pump chamber 7, the fluid in the annular groove 34 brings the suction valve membrane 22 into pressure contact with the suction valve seat portion 32. The suction valve blocks the suction flow path and prevents the fluid from flowing out to the suction path 12.

  The present invention can be modified in design, and the diaphragm assembly 5 may be formed by disposing four diaphragms 50 at equal intervals of 90 degrees in the circumferential direction. At that time, four intake valve membranes 22 of the intake valve membrane assembly 2 and four intake valve seat portions 32 and discharge valve seat portions 35 of the inner lid body 3 are provided.

  As described above, the present invention includes a bowl-shaped diaphragm 50 that opens in one axial center direction L1, and a short cylindrical discharge valve membrane portion that is formed by extending the opening edge of the diaphragm 50 in one axial center direction L1. 52, a diaphragm assembly 54 having a plane orthogonal to the axis center orthogonally connecting a plurality of diaphragms 50 in an equally distributed manner, a flat plate section 24 having a plane orthogonal to the axis center, and a plate section 24. Between the diaphragm assembly 5 and the suction valve membrane assembly 2. The suction valve assembly 2 has a plurality of short cylindrical suction valve membranes 22 projecting in the axial direction other than the circumferential direction L 2. A cylindrical discharge valve seat portion 35 in which the discharge valve membrane portion 52 comes into contact with the outer peripheral surface so as to be in close contact with the outer peripheral surface; And the inner lid body 3 having a circular suction valve seat portion 32 that comes into contact with the diaphragm pump, Actuation of Te is stable, highly reliable (quality), long life. In addition, the umbrella-shaped valve body (of the conventional small parts) can be omitted, the number of parts can be reduced, and the assembly can be facilitated. The manufacturing man-hours and assembly man-hours of the members can be reduced, and the manufacturing cost can be greatly reduced while being easily manufactured. Since there is no member that operates in the pump chamber 7 like an umbrella-shaped valve body (it is not necessary to prevent interference between members), it is not necessary to make the diaphragm 50 or the pump chamber 7 large, and the pump Can be downsized. Further, the valve membrane (suction valve membrane 22 and discharge valve membrane portion 52) having a shorter cylindrical shape than the beating sound of the valve generated when the umbrella-shaped valve body is in close contact with the valve seat portion is replaced with the valve seat portion (suction valve seat portion 32) In addition, it is possible to obtain a diaphragm pump for fluid with a quieter operating sound with a quieter sound due to a close contact with the discharge valve seat portion 35). In addition, a plurality of intake valve assembly steps and a sealing member arrangement step between the inner lid body 3 and the lid body 1 can be performed at the same time, making it easy and quick to assemble, reducing the number of assembly steps, and improving work efficiency. Can be improved. Further, the suction flow path and the discharge flow path can be formed on the lid body 1, the suction valve membrane assembly 2, and the inner lid body 3 side (in the axial direction L1 side from the drive unit 53 of the diaphragm 50). Allows liquid pumping. In addition, because the discharge and suction side valve bodies are formed in a short cylindrical shape, the stiffness is strengthened, and tearing, twisting, and breaking are prevented, and the operation of close contact / separation (contact / separation) with the valve seat is more effective. A predetermined amount of fluid can be pumped stably and reliably.

  Further, an annular groove 34 is formed between the cylindrical discharge valve seat 35 and the circular suction valve seat 32, and the suction valve membrane 22 is accommodated in the annular groove 34 so as to be inserted. A suction valve including the suction valve membrane 22 and the suction valve seat portion 32 can be formed (assembled) easily and quickly. The overall length of the entire pump can be shortened and miniaturized. In other words, a fluid diaphragm pump that is quiet and stable in operation (having the suction valve membrane 22 formed in the shape of a short cylinder) can be obtained without increasing the size.

  Further, the inner lid 3 is provided with an annular positioning convex portion 33 concentrically with the suction valve seat portion 32 and projecting in one axial direction L1. The suction valve membrane assembly 2 is concentric with the suction valve membrane 22. Since the annular positioning concave portion 23 into which the positioning convex portion 33 is inserted is provided, the suction valve membrane 22 and the suction valve seat portion 32 can be easily disposed concentrically. In addition, the intake valve membrane 22 and the intake valve seat portion 32 can be securely brought into close contact with each other to form an intake valve that is less likely to cause leakage, and assembly failure can be prevented.

  Further, since the flat plate portion 24 of the intake valve membrane assembly 2 is provided with the protruding strip portion 29 which is in close contact with the inner lid 3 and partitions the atmosphere side, the high pressure side and the low pressure side in a sealing manner, the flat plate portion 24 is sealed. It can be set as a highly reliable seal part. Leakage can be prevented and liquid or gas can be pumped more efficiently. The suction valve membrane assembly 2 can be used together as a packing member, so that the number of parts can be reduced and the number of assembly steps can be reduced.

2 Suction valve membrane assembly 3 Inner lid 5 Diaphragm assembly
22 Suction valve membrane
23 Positioning recess
24 Plate part
29 Projections
32 Suction valve seat
33 Positioning projection
34 Annular groove
35 Discharge valve seat
50 Diaphragm
52 Discharge valve membrane
54 Diaphragm L1 One axial direction L2 Other axial direction

Claims (4)

A bowl-shaped diaphragm (50) that opens in one axial center direction (L1), and a short cylindrical discharge valve membrane that is formed by extending an opening edge of the diaphragm (50) in one axial center direction (L1). A diaphragm assembly comprising: a portion (52); and a diaphragm portion (54) having a plane orthogonal to the axial center that integrally connects the plurality of diaphragms (50) to a circumferentially equal distribution;
A flat plate portion (24) having a plane orthogonal to the axial center, and a plurality of short cylindrical intake valve membranes (22) projecting from the flat plate portion (24) in the other axial direction (L2) in a circumferentially equal distribution, An intake valve membrane assembly (2) having
A cylindrical discharge valve seat (35) interposed between the diaphragm assembly (5) and the suction valve membrane assembly (2), and the discharge valve membrane portion (52) is in close contact with the outer peripheral surface so as to be separable and separable. And a circular intake valve seat portion (32) disposed concentrically with the discharge valve seat portion (35) so that the suction valve membrane (22) is in close contact with the outer peripheral surface so as to be separable and separable. A fluid diaphragm pump comprising: a body (3).   An annular groove (34) is formed between the cylindrical discharge valve seat (35) and the circular suction valve seat (32), and the suction valve membrane is formed in the annular groove (34). The diaphragm pump for fluid according to claim 1, wherein (22) is housed in an insertion shape. An annular positioning projection (33) that is concentric with the suction valve seat (32) and projects in one axial direction (L1) is provided on the inner lid (3),
3. An annular positioning recess (23) provided concentrically with the suction valve membrane (22) and into which the positioning projection (33) is inserted in the suction valve membrane assembly (2). Diaphragm pump for fluid.   On the flat plate portion (24) of the intake valve membrane assembly (2), a ridge portion (29) is formed in close contact with the inner lid body (3) to partition the atmosphere side, the high pressure side and the low pressure side in a sealing manner. The diaphragm pump for fluids according to claim 1, 2 or 3.

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