JP2018112127A - Diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm pump reducing hammering noise generated when a discharge valve is closed.SOLUTION: A diaphragm pump includes: a disk portion 21 (plate-like body) serving as a portion of a wall of a discharge chamber 41 (discharge passage); a diaphragm 14 serving as a pump chamber 24 and having a deformation portion 23; and a drive mechanism 25 having a drive element 27 (reciprocating portion) mounted to the deformation portion 23. The diaphragm pump further includes: a discharge through hole 33 penetrating through the disk portion 21 to communicate the discharge chamber 41 and the pump chamber 24 with each other; and a rubber discharge valve 43. The discharge valve 43 includes a plate-like valve element section 43c coming into close contact with a wall surface of the disk portion 21 including the discharge chamber 41 side opening of the discharge through hole 33. The diaphragm pump further includes a stopper 45 that is formed of a flexible material and provided in the discharge chamber 41 and that abuts on the valve element portion 43c while the valve element portion 43c (valve element) of the discharge valve 43 is opened only by predetermined amount.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a diaphragm pump having a discharge valve formed of rubber.

  As a discharge valve of a conventional diaphragm pump, for example, there is one described in Patent Document 1. The discharge valve 1 disclosed in Patent Document 1 is formed in a substantially disk shape from a rubber material, and has a cap-shaped mounting portion 2 located in the center and an annular shape extending outward from the mounting portion 2 in the radial direction. And the valve body portion 3. The attachment portion 2 is fixed to a hemispherical convex portion 4a that protrudes from the plate-like body 4.

The plate-like body 4 partitions the pump chamber 5 and the discharge passage 6. The plate-like body 4 is provided with a through hole 7 that allows the pump chamber 5 and the discharge passage 6 to communicate with each other. In the plate-like body 4, the periphery of the opening on the discharge passage side of the through hole 7 is formed flat so as to be a seal surface 8 with which the valve body portion 3 is in contact.
The valve body 3 of the discharge valve 1 is formed so as to be in close contact with the seal surface 8 by its own spring force.

  In the diaphragm pump having the discharge valve 1 configured as described above, when the fluid pressure in the pump chamber 5 rises, it is applied to the valve body portion 3 through the through hole 7 as shown on the right side in FIG. The valve body 3 is pushed by the pressure of the fluid, and the fluid is discharged from the pump chamber 5 through the through hole 7 to the discharge passage 6. On the other hand, when the pressure in the pump chamber 5 decreases, as shown on the left side in FIG. 3, the valve body portion 3 of the discharge valve 1 abuts against the seal surface 8 with its own spring force to close the through hole 7, The backflow of fluid from 6 to the pump chamber 5 is prevented.

JP 2007-162472 A

  In the discharge valve 1 shown in Patent Document 1, the amount of opening and closing cannot be managed, and there is a problem that when the valve body 3 is closed, the valve body portion 3 collides with the seal surface 8 and a loud sound is generated.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a diaphragm pump that generates a small hitting sound when the discharge valve is closed.

In order to achieve this object, a diaphragm pump according to the present invention includes a plate-like body that constitutes a part of a wall of a discharge passage, and a cup-shaped deformation portion that forms a pump chamber in cooperation with the plate-like body. And a reciprocating part attached to the deforming part, the reciprocating part reciprocatingly moves a drive mechanism that increases or decreases the volume in the deforming part, and penetrates the plate-like body, A through-hole communicating with the discharge passage and the pump chamber; and a plate-like valve body that is in close contact with a wall surface of the plate-like body including the discharge passage side opening of the through-hole; A rubber discharge valve that allows passage of fluid only to the valve, and a valve that is formed of a flexible material and provided in the discharge passage, with the valve body of the discharge valve being opened by a predetermined amount. It has a stopper that comes into contact with the body Than is.
In the diaphragm pump according to the present invention, the discharge passage is formed between the plate-like body and a passage wall facing the wall surface of the plate-like body, and the stopper is supported by the passage wall. Also good.

According to the present invention, the opening amount of the valve body of the discharge valve is limited by the stopper. For this reason, compared with the conventional diaphragm pump, since the kinetic energy at the time of closing a valve body can be made small, the hitting sound at the time of closing of a discharge valve becomes small.
Therefore, according to the present invention, it is possible to provide a diaphragm pump that generates a small sound when the discharge valve is closed.

It is sectional drawing of the diaphragm pump which concerns on this invention. FIG. 1 shows a state in which the intake valve is open during the intake stroke. It is sectional drawing of the diaphragm pump which concerns on this invention. FIG. 2 shows a state in which the discharge valve is open during the discharge stroke. It is sectional drawing of the discharge valve used for the conventional diaphragm pump.

Hereinafter, an embodiment of a diaphragm pump according to the present invention will be described in detail with reference to FIGS.
A diaphragm pump 11 shown in FIG. 1 is a pump that is attached to a motor 12 positioned at the bottom in FIG. 1 and is driven by the motor 12 to suck and discharge the atmosphere. The diaphragm pump 11 includes a housing 13 attached to a motor 12 and a diaphragm 14 held by the housing 13.

  The housing 13 is formed in a cylindrical shape by combining a plurality of members to be described later in the axial direction of the motor 12, and is positioned on the same axis as the rotating shaft 15 of the motor 12. The plurality of members constituting the housing 13 include a bottomed cylindrical bottom body 16 attached to the motor 12, and a valve holder 18 having a cylindrical portion 17 having one end attached to an opening portion of the bottom body 16. A bottomed cylindrical lid 19 attached to the other end of the cylindrical portion 17 or the like.

  The valve holder 18 has a disk portion 21 that partitions the inside of the cylindrical portion 17 into one side and the other side in the axial direction. The diaphragm 14 is overlaid on the wall surface of the disc portion 21 on the motor 12 side, and is fixed to the disc portion 21 by a diaphragm holder 22. The disc portion 21 constitutes a “plate-like body” in the present invention.

The diaphragm 14 has a plurality of cup-shaped deformed portions 23 (only one is shown in FIGS. 1 and 2) that open toward the disc portion 21 of the valve holder 18. The opening portions of these deformation portions 23 are closed by the disc portion 21. A pump chamber 24 is formed between the deforming portion 23 and the disc portion 21.
A driving mechanism 25 is connected to the deformation portion 23 of the diaphragm 14.

  The drive mechanism 25 includes a crank 26 attached to the rotary shaft 15 of the motor 12 and a drive element 27 attached to the crank 26. The driver 27 includes a columnar shaft portion 27a that is rotatably supported by the crank 26 via a support shaft 28, and a plurality of arm portions 27b that project radially outward from the shaft portion 27a (in FIG. 1). Only one is shown). The support shaft 28 is connected to a portion of the crank 26 that is eccentric from the rotation shaft 15, and is inclined with respect to the rotation shaft 15. The direction in which the support shaft 28 is inclined is a direction in which the tip end portion of the support shaft 28 is located on the same axis as the rotation shaft 15.

  The arm 27 b has a connecting piece 29 projecting from the deforming portion 23 of the diaphragm 14, and is connected to the deforming portion 23 through the connecting piece 29. Therefore, the rotation of the driving element 27 is restricted by the diaphragm 14, and the rotation of the crank 26 together with the rotating shaft 15 converts this rotation into a reciprocating motion and transmits it to the deforming portion 23. In this embodiment, the driver 27 corresponds to the “reciprocating part” in the present invention. The drive mechanism 25 increases or decreases the volume in the deformation portion 23 by the reciprocating motion of the driver element 27.

  A suction valve 31 is provided in a portion of the disc portion 21 of the valve holder 18 constituting the wall of the pump chamber 24, and a suction through hole 32 and a discharge through hole 33 are formed therein. The suction valve 31 is formed of a rubber material, and has a valve body 31a that is in close contact with the wall surface of the disc portion 21 on the pump chamber 24 side by its own spring force. The valve body 31 a opens and closes the opening portion of the suction through hole 32.

  The suction through hole 32 communicates the pump chamber 24 with the downstream side intake chamber 34 formed between the valve holder 18 and the lid 19. The downstream side intake chamber 34 is surrounded by a cylinder 35 protruding from the center of the disc portion 21 and connected to the lid 19, an outer peripheral portion of the disc portion 21, and an outer peripheral portion of the lid 19. Is formed. The downstream side intake chamber 34 communicates with the housing inner space 37 via a downstream side passage hole 36 provided in the outer peripheral portion of the disc portion 21. The housing inner space 37 is partitioned from the outside of the housing 13 by the bottom body 16 of the housing 13 and the valve holder 18. Further, the housing inner space 37 communicates with the atmosphere via an upstream side intake chamber 38 located on the left side in FIG.

  The upstream side intake chamber 38 is formed by being surrounded by the above-described cylinder 35 of the valve holder 18, the outer peripheral portion of the disc portion 21, and the outer peripheral portion of the lid body 19. The upstream intake chamber 38 and the downstream intake chamber 34 described above are partitioned by a partition wall (not shown). The upstream side intake chamber 38 is communicated with the housing inner space 37 via the upstream side passage hole 39 and also communicated with the atmosphere via the through hole 40 of the lid body 19.

  A discharge through hole 33 provided in the disc portion 21 communicates the pump chamber 24 and the discharge chamber 41 partitioned by the disc portion 21 of the valve holder 18. The discharge chamber 41 is formed by being surrounded by the wall surface of the central portion of the disc portion 21, the passage wall 19 a of the lid body 19 facing the wall surface, and the cylinder 35 described above. The discharge pipe 42 is communicated with the atmosphere. In this embodiment, the discharge chamber 41 corresponds to a “discharge passage” in the present invention.

  A discharge valve 43 is provided in the discharge chamber 41 and at the center of the disc portion 21 of the valve holder 18. The discharge valve 43 is made of a rubber material, and has a cap part 43a fitted to a hemispherical protrusion 44 of the disk part 21, a plate-like part 43b connected to one side part of the cap part 43a, and a cap part. 43a is connected to the other side of 43a. Although only one plate-like portion 43b and one valve body portion 43c are depicted in FIGS. 1 and 2, the number of the plate-like portions 43b and the valve body portions 43c are actually the same as the number of deformed portions 23 of the diaphragm 14. 21 are arranged at predetermined intervals in the circumferential direction.

  The plate-like portion 43 b is fixed by being sandwiched between the disc portion 21 and the protrusion 19 b of the lid body 19. The valve body portion 43c is formed in a plate shape, and is brought into close contact with the wall surface of the disc portion 21 on the discharge chamber 41 side by its own spring force, and opens and closes the opening portion of the discharge through hole 33. That is, the discharge valve 43 allows fluid to pass only from the pump chamber 24 to the discharge chamber 41. In this embodiment, the valve body 43c corresponds to the “valve body” in the present invention.

A stopper 45 is provided in the discharge chamber 41 in the vicinity of the valve body 43c. The stopper 45 is formed of a flexible material such as urethane sponge, and is supported by the passage wall 19a facing the disc portion 21 in the lid body 19 along the inner peripheral surface of the cylinder 35 described above. ing.
The stopper 45 is formed in a predetermined size and disposed at a predetermined position so that the valve body 43c of the discharge valve 43 is in contact with the valve body 43c with the valve body 43c being opened by a predetermined amount. .
The stopper 45 according to this embodiment is formed for each valve body portion 43c, and is provided at a position corresponding to each valve body portion 43c.

  In the diaphragm pump 11 configured as described above, the motor 12 rotates, and the support shaft 28 of the drive element 27 rotates about the rotation axis 15 of the motor 12, whereby the arm portion 27 b of the drive element 27 rotates. The deforming portion 23 of the diaphragm 14 is pushed or pulled by reciprocating in the axial direction of the shaft 15. When the deforming portion 23 is pulled to the motor 12 side by the arm portion 27b, the volume of the pump chamber 24 is increased as shown in FIG. 1, the suction valve 31 is opened, and the fluid (air) in the downstream side intake chamber 34 is opened. Is sucked into the pump chamber 24 through the through-hole 32 for suction. At this time, the air in the housing inner space 37 is sucked into the downstream intake chamber 34 through the downstream passage hole 36, and the air in the upstream intake chamber 38 passes through the upstream passage hole 39. Inhaled. In addition, air is sucked into the upstream side intake chamber 38 through the through hole 40 of the lid 19.

On the other hand, when the deforming portion 23 of the diaphragm 14 is pushed to the disk portion 21 side of the valve holder 18 by the arm portion 27b, the deforming portion 23 is compressed and the volume of the pump chamber 24 is reduced as shown in FIG. The discharge valve 43 is opened, and the air in the pump chamber 24 is discharged into the discharge chamber 41 through the discharge through hole 33. At this time, the valve body 43c of the discharge valve 43 swings against its own spring force in the direction in which the tip portion is separated from the disc portion 21. The swinging (opening amount) of the valve body 43c is limited by the tip of the valve body 43c coming into contact with the stopper 45. As a result, the valve body portion 43c does not swing excessively, and the kinetic energy when the discharge valve 43 is closed is smaller than that of the conventional discharge valve 43 that opens indefinitely.
Therefore, according to this embodiment, since the kinetic energy at the time of closing the discharge valve 43 can be reduced, it is possible to provide a diaphragm pump with a low sound when the discharge valve 43 is closed.

The discharge chamber 41 according to this embodiment is formed between the wall surface of the disc portion 21 with which the valve body portion 43c is in close contact and the passage wall 19a of the lid 19 facing this wall surface. The stopper 45 is supported by the passage wall 19a.
For this reason, since the stopper 45 does not block the air flowing into the discharge chamber 41 from the discharge through-hole 33, the resistance of the air flowing in the discharge chamber 41 is made as much as possible despite the provision of the stopper 45. Can be small. Therefore, according to this embodiment, it is possible to provide a diaphragm pump in which the sound generated from the discharge valve 43 is reduced and air is efficiently discharged.

  The valve body portion 43c (valve body) of the discharge valve 43 according to the above-described embodiment is in close contact with the disc portion 21 by its own spring force. However, the valve body of the discharge valve according to the present invention is not limited to such a limitation. For example, as the valve body, a valve body that is held in a state of being in close contact with the disk portion 21 in a natural state and is closed by the discharge through-hole 33 and opened by a pressure difference between the pump chamber 24 and the discharge chamber 41 is used. Can do.

  DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 14 ... Diaphragm, 19a ... Passage wall, 21 ... Disc part (plate-shaped body), 23 ... Deformation part, 24 ... Pump chamber, 25 ... Drive mechanism, 27 ... Drive element (reciprocating motion part), 33 ... Discharge through hole, 41 ... Discharge chamber (discharge passage), 43 ... Discharge valve, 43c ... Valve body part (valve body), 45 ... Stopper.

Claims (2)

A plate-like body constituting a part of the wall of the discharge passage;
A diaphragm having a cup-shaped deformable portion that forms a pump chamber in cooperation with the plate-like body;
A reciprocating part attached to the deforming part, and a driving mechanism for increasing or decreasing the volume in the deforming part by reciprocating the reciprocating part;
A through-hole penetrating the plate-like body and communicating the discharge passage and the pump chamber;
A rubber discharge valve that has a plate-like valve body that is in close contact with the wall surface of the plate-like body including the discharge passage side opening of the through-hole, and allows passage of fluid only from the pump chamber to the discharge passage;
A diaphragm pump comprising: a stopper formed of a flexible material and provided in the discharge passage, the stopper being in contact with the valve body when the valve body of the discharge valve is opened by a predetermined amount. The diaphragm pump according to claim 1, wherein
The discharge passage is formed between the plate-like body and a passage wall facing the wall surface of the plate-like body,
The diaphragm pump, wherein the stopper is supported by the passage wall.

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