JP2018189015A - Diaphragm pump - Google Patents

Abstract

A diaphragm pump is provided in which the load acting in the axial direction of a drive shaft is distributed to reduce the wear of sliding parts and improve durability. A diaphragm (34) having an elastically deformable portion (41) forming a pump chamber is provided. A crank body 62 that rotates integrally with the rotating shaft 35 of the motor 32 , a drive shaft 63 that is inclined with one end connected to an eccentric position of the crank body 62 , and the other end of the drive shaft 63 and the elastic deformation portion 41 are connected. , and a drive body 64 that cooperates with the drive shaft 63 to convert rotation into reciprocating motion. A pump mechanism (suction valve 43, discharge valve 53) is provided that alternately repeats a state in which the fluid is discharged from the pump chamber 42 and a state in which the fluid is sucked into the pump chamber 42 as the driving body 64 reciprocates. An end face 65 of the crank body 62 facing the driving body 64 and an end face 68 of the driving body 64 facing the crank body 62 are formed parallel to each other and slidably contact each other. [Selection diagram] Fig. 1

Description

  The present invention relates to a diaphragm pump including a drive unit that converts rotation into reciprocating motion using an inclined drive shaft.

  As a conventional diaphragm pump of this type, there is one described in Patent Document 1, for example. The diaphragm pump disclosed in Patent Document 1 is configured as shown in FIG. The diaphragm pump 1 shown in FIG. 3 is configured by assembling functional parts to be described later into a cylindrical housing 2. The housing 2 is formed by stacking a bottomed cylindrical bottom portion 4 having a motor 3 attached to one end thereof, a cylindrical diaphragm holder 5, a disc-shaped valve holder 6, and a lid member 7 in this order. Has been. A diaphragm 8 is sandwiched and held between the diaphragm holder 5 and the valve holder 6.

The diaphragm pump 1 includes the housing 2 and the diaphragm 8, a drive mechanism 9 accommodated in the housing 2, an intake valve 10 and a discharge valve 11 attached to the valve holder 6.
The drive mechanism 9 includes a crank body 13 that rotates integrally with the rotary shaft 12 of the motor 3, and a drive body 15 that is rotatably supported by the crank body 13 via a drive shaft 14. The drive shaft 14 is inclined with one end connected to an eccentric position of the crank body 13. The drive body 15 is connected to the other end of the drive shaft 14. The center 15 a of the drive body 15 intersects the axis C <b> 1 of the rotation shaft 12. The driving body 15 has a plurality of arm portions 15b.
One end of the drive shaft 14 is fixed to the crank body 13, and the other end is slidably supported by the drive body 15.

  The diaphragm 8 is provided with a plurality of cup-shaped elastic deformation portions 8a. The opening portions of these elastic deformation portions 8a are respectively closed by the valve holder 6. A pump chamber 16 is formed between the elastic deformation portion 8 a and the valve holder 6. The bottom of each elastic deformation part 8a is connected to the arm part 15b of the drive body 15, respectively.

  The suction valve 10 provided in the valve holder 6 is provided in the middle of a suction passage 17 that communicates the pump chamber 16 with the outside of the diaphragm pump 1 and opens when the volume of the pump chamber 16 increases. The case is kept closed. The suction passage 17 has a through hole 18 opened and closed by the suction valve 10, a suction chamber 19 provided in the valve holder 6, and a housing 2 communicated with the suction chamber 19 through a communication passage (not shown). The space S, the through-hole 20 of the valve holder 6 that opens into the space S, and the through-hole 21 of the lid member 7 connected to the through-hole 20 are configured.

  The discharge valve 11 is provided in the middle of a discharge passage 23 that connects the pump chamber 16 and the discharge port 22 of the lid member 7, and is opened when the volume of the pump chamber 16 is reduced, and is closed in other cases. Kept. The discharge passage 23 includes a through hole 24 of the valve holder 6, a discharge chamber 25 formed between the valve holder 6 and the lid member 7, an internal space of a discharge pipe 26 having a discharge port 22, and the like. .

  In the diaphragm pump 1 configured as described above, the crank body 13 and the drive shaft 14 rotate integrally with the rotation of the rotary shaft 12 of the motor 3, so that the drive body 15 has the center 15a as a swing center. Swing. As a result, the arm portion 15 b of the driving body 15 reciprocates in the axial direction of the motor 3, and this reciprocating motion is transmitted to the bottom of the elastic deformation portion 8 a of the diaphragm 8. When the bottom of the elastic deformation portion 8 a is pushed by the arm portion 15 b, the discharge valve 11 is opened, and the fluid in the pump chamber 16 is discharged to the discharge passage 23. When the bottom of the elastic deformation portion 8a is pulled in the direction opposite to the above by the arm portion 15b, the suction valve 10 is opened and fluid (atmosphere) flows into the pump chamber 16 from the suction passage 17.

When the arm portion 15b of the drive body 15 presses the elastic deformation portion 8a of the diaphragm 8, the drive body 15 is pressed against the shaft end surface 14a of the other end portion of the drive shaft 14 by a reaction force.
As shown in FIG. 4, one end of the drive shaft 14 may be slidably supported by the crank body 13 and the other part may be fixed to the drive body 15. In this case, the shaft end surface 14 b at one end of the drive shaft 14 is pressed against the crank body 13 by the reaction force described above.

JP2013-163975A

  In the diaphragm pump shown in FIG. 3, the shaft end surface 14a of the drive shaft 14 abuts on the drive body 15, and rotates with respect to the drive body 15 while receiving a load of the pump portion (diaphragm 8) (the drive body 15 while receiving the load). Sliding against). For this reason, since the sliding portion between the shaft end surface 14a of the drive shaft 14 and the drive body 15 is worn, there is a limit in increasing the durability of the diaphragm pump 1. As shown in FIG. 4, even when the shaft end surface 14a of the drive shaft 14 abuts against the crank body 13, the abutting portion is worn by sliding, so that the durability can be increased as described above. was there.

  The present invention has been made to solve such a problem, and provides a diaphragm pump that distributes a load acting in the axial direction of a drive shaft to reduce wear of a sliding portion and improve durability. With the goal.

  In order to achieve this object, a diaphragm pump according to the present invention includes a diaphragm having an elastically deforming portion that forms a pump chamber, a crank body that rotates integrally with a rotating shaft of a motor, and an eccentric position of the crank body. A drive shaft that is inclined with one end connected thereto, a drive body that is connected to the other end of the drive shaft and the elastic deformation portion, and that converts the rotation of the crank body into a reciprocating motion in cooperation with the drive shaft; A pump mechanism that alternately repeats a state in which fluid is discharged from the pump chamber and a state in which fluid is sucked into the pump chamber as the drive body reciprocates, and faces the drive body in the crank body The end face and the end face of the driving body facing the crank body are formed in parallel with each other and are slidably in contact with each other.

  In the diaphragm pump according to the present invention, the drive shaft is connected to at least one member of the crank body and the drive body so as to be rotatable and movable in an axial direction, the crank body and the drive body. And a contact portion between a member that is rotatable with respect to the drive shaft and movable in an axial direction and a shaft end surface of the drive shaft, and a sliding portion between the crank body and the drive body during discharge. A load may be transmitted.

  According to the present invention, in the diaphragm pump, a washer may be interposed in a sliding contact portion between the crank body and the driving body.

In the present invention, the load applied to the drive body from the diaphragm at the time of driving the pump, that is, the load acting in the axial direction of the drive shaft is also transmitted to the sliding portion composed of the end face of the drive body and the end face of the crank body, It is distributed over a wide range of the end face of the drive body and the end face of the crank body. For this reason, the surface pressure of a sliding part can be made low and abrasion resistance becomes high.
Therefore, according to the present invention, it is possible to provide a diaphragm pump that disperses a load acting in the axial direction of the drive shaft, reduces wear of the sliding portion, and improves durability.

It is sectional drawing of the diaphragm pump by 1st Embodiment. It is sectional drawing of the diaphragm pump by 2nd Embodiment. It is sectional drawing of the conventional diaphragm pump. It is sectional drawing which shows a part of conventional diaphragm with which the drive shaft is being fixed to the drive body.

(First embodiment)
An embodiment of a diaphragm pump according to the present invention will be described in detail below with reference to FIG.
A diaphragm pump 31 of the form shown in FIG. 1 is a pump that is attached to a motor 32 positioned at the bottom in FIG. 1 and is driven by the motor 32 to suck and discharge the atmosphere. The diaphragm pump 31 includes a housing 33 attached to the motor 32 and a diaphragm 34 provided on the housing 33.

  The housing 33 is formed in a columnar shape by combining a plurality of members to be described later in a direction along the axis C <b> 2 of the motor 32, and is positioned on the same axis as the rotation shaft 35 of the motor 32. A plurality of members constituting the housing 33 include a bottomed cylindrical bottom body 36 attached to the motor 32, a cylindrical diaphragm holder 37 attached to an opening portion of the bottom body 36, and the diaphragm holder 37. A disk-shaped valve holder 38 attached to the opening portion via a diaphragm 34, a lid 39 attached to the valve holder 38 in a state of being overlapped with the valve holder 38, and the like. The diaphragm 34 is sandwiched and held between a diaphragm holder 37 and a valve holder 38.

  The diaphragm 34 has a plurality of cup-shaped elastic deformation portions 41 that open toward the valve holder 38. These elastic deformation portions 41 are respectively provided at positions where the diaphragm 34 is divided into a plurality of portions in the circumferential direction of the housing 33. The opening portion of the elastic deformation portion 41 is closed by the valve holder 38. A pump chamber 42 is formed between the elastic deformation portion 41 and the valve holder 38.

  A suction valve 43 is provided in a portion constituting the wall of the pump chamber 42 in the valve holder 38, and a first through hole 44 and a second through hole 45 are opened. The suction valve 43 is formed of a rubber material and has a valve body 43 a that is in close contact with the wall surface of the valve holder 38 on the pump chamber 42 side. The valve body 43 a closes the opening portion of the first through hole 44.

  The first through-hole 44 opens into the housing inner space S, a suction fluid chamber 46 of the valve holder 38, a communication path (not shown) that communicates the suction fluid chamber 46 with the housing inner space S. The valve holder 38 communicates with the atmosphere through the third through hole 47 of the valve holder 38 and the fourth through hole 48 of the lid 39 connected to the third through hole 47.

The second through-hole 45 communicates between the discharge fluid chamber 51 and the pump chamber 42 formed between the valve holder 38 and the lid 39 and formed in the axial center portion of the housing 33. The discharge fluid chamber 51 is connected to the internal space of the discharge pipe 52 protruding from the lid 39.
A discharge valve 53 is provided in the discharge fluid chamber 51. The discharge valve 53 is formed of a rubber material, and has a valve body 53a that is in close contact with the wall surface of the valve holder 38 on the discharge fluid chamber 51 side. The valve body 53 a closes the opening portion of the second through hole 45.

  The discharge valve 53 and the above-described suction valve 43 open and close as the volume of the pump chamber 42 increases and decreases. The discharge valve 53 opens in a compression stroke in which the volume of the pump chamber 42 decreases, and is closed in other cases. The suction valve 43 opens in the expansion stroke in which the volume of the pump chamber 42 increases, and is closed in other cases. The volume of the pump chamber 42 changes when the elastic deformation portion 41 of the diaphragm 34 is pushed or pulled by a drive mechanism 61 described later.

The drive mechanism 61 includes a crank body 62 attached to the rotary shaft 35 of the motor 32 and rotating integrally with the rotary shaft 35, and a drive body 64 attached to the crank body 62 via a drive shaft 63 inclined. ing.
An end surface 65 of the crank body 62 facing the drive body 64 is formed on a support seat 66 of the crank body 62 and extends in a direction orthogonal to the axial direction of the drive shaft 63. The shape of the end surface 65 viewed from the axial direction of the drive shaft 63 is an annular shape.

  The drive shaft 63 is connected to a portion of the crank body 62 that is eccentric from the rotation shaft 35, and is inclined with respect to the rotation shaft 35. The direction in which the drive shaft 63 is inclined is a direction in which the axis of the drive shaft 63 intersects the axis C2 of the rotation shaft 35. One end of the drive shaft 63 according to this embodiment is fixed to the crank body 62. The other end of the drive shaft 63 is connected to the drive body 64 so as to be slidable (rotatable and movable in the axial direction).

  The drive body 64 includes a columnar shaft portion 64a that is slidably supported on the other end portion of the drive shaft 63, and a plurality of arm portions 64b that protrude radially outward from the shaft portion 64a. Yes. In this embodiment, the other end side of the drive shaft 63 is slidably fitted into a shaft hole 67 formed of a non-through hole of the drive body 64. The shaft end surface 63 a at the other end of the drive shaft 63 is slidably in contact with the bottom surface 67 a of the shaft hole 67. The drive body 64 according to this embodiment is connected to the drive shaft 63 in this manner, so that the tip center 64c of the shaft portion 64a intersects the axis C2 of the rotation shaft 35.

  An end surface 68 of the shaft portion 64 a facing the crank body 62 extends in a direction orthogonal to the axial direction of the drive shaft 63, and slidably contacts the end surface 65 of the crank body 62. That is, the end face 65 of the crank body 62 facing the drive body 64 and the end face 68 of the drive body 64 facing the crank body 62 are formed in parallel with each other and slidably contacted.

The arm portion 64 b has a connecting piece 71 protruding from the elastic deformation portion 41 of the diaphragm 34, and is connected to the elastic deformation portion 41 via the connection piece 71. For this reason, the rotation of the drive body 64 is restricted by the diaphragm 34, and the crank body 62 rotates with the rotary shaft 35, so that the drive body 64 swings around the tip center 64c. As a result, the arm portion 64 b of the driving body 64 reciprocates in the axial direction of the motor 32, and this reciprocating motion is transmitted to the bottom of the elastic deformation portion 41 of the diaphragm 34. That is, the driving body 64 converts the rotation into a reciprocating motion in cooperation with the driving shaft 63 and transmits it to the elastic deformation portion 41.
When the elastic deformation portion 41 of the diaphragm 34 is pulled toward the motor 32 by the arm portion 64b, the volume of the pump chamber 42 increases, the suction valve 43 opens, and the atmosphere passes through the fourth through hole 48 → the third through hole. 47 → Housing space S → Communication passage (not shown) → Suction fluid chamber 46 → The first through hole 44 is sucked into the pump chamber 42.

On the other hand, when the elastic deformation portion 41 of the diaphragm 34 is pushed toward the valve holder 38 by the arm portion 64b, the elastic deformation portion 41 is compressed, the volume of the pump chamber 42 is reduced, the discharge valve 53 is opened, and the pump chamber 42 is opened. The inside air is discharged from the discharge pipe 52 through the second through hole 45 and the discharge fluid chamber 51.
As the crank body 62 continuously rotates, the state in which air is discharged from the pump chamber 42 as the drive body 64 reciprocates and the state in which air is sucked into the pump chamber 42 are alternately repeated. It is.
In this embodiment, the suction valve 43 and the discharge valve 53, the suction system passage opened and closed by the suction valve 43, and the discharge system passage opened and closed by the discharge valve 53 are referred to as "pump mechanism" in the present invention. It corresponds to.

In the diaphragm pump 31, a load is applied to the driving body 64 from the elastic deformation portion of the diaphragm during operation. This load, that is, the load acting in the axial direction of the drive shaft 63 is also transmitted to the sliding portion formed by the end surface 68 of the drive body 64 and the end surface 65 of the crank body 62, and the end surface 68 of the drive body 64 and the crank body 62 are transmitted. Are distributed over a wide range of the end face 65 of the substrate. For this reason, the surface pressure of a sliding part can be made low and abrasion resistance becomes high.
Therefore, according to this embodiment, it is possible to provide a diaphragm pump in which the load acting in the axial direction of the drive shaft 63 is distributed to reduce wear of the sliding portion and durability is improved.

In this embodiment, one end of the drive shaft 63 is fixed to the crank body 62, and a contact portion between the shaft end surface 63a at the other end of the drive shaft 63 and the drive body 64 (a member that is rotatable with respect to the drive shaft 63). And the shaft end surface 63a of the drive shaft 63), and the sliding portion between the crank body 62 and the drive body 64, the load during discharge is transmitted.
For this reason, the load acting in the axial direction of the drive shaft 63 can be distributed in two places, the sliding contact portion including the shaft end surface 63 a of the drive shaft 63 and the sliding contact portion between the drive body 64 and the crank body 62. Therefore, it is possible to provide a diaphragm pump with higher durability.

(Second Embodiment)
The sliding part between the crank body and the drive body can be configured as shown in FIG. 2, the same or equivalent members as described with reference to FIG. 1 are denoted with the same reference numerals, and detailed description thereof is omitted as appropriate.
A washer 81 is interposed in the sliding portion between the crank body 62 and the drive body 64 shown in FIG. The washer 81 is formed in an annular plate shape through which the drive shaft 63 passes. The material forming the washer 81 is a steel material, an abrasion-resistant resin material, or the like.
The outer diameter of the washer 81 according to this embodiment is larger than the diameter of the annular end surface 68 of the shaft portion 64a and smaller than the diameter of the annular end surface 65 of the crank body 62.

  In this embodiment, since the washer 81 is a substantial end surface of the crank body 62 or the washer 81 is a substantial end surface of the drive body 64, the area of the sliding contact portion between the crank body 62 and the drive body 64 is reduced. Can be changed by the washer 81. This means that the substantial end surface of the driver 64 can be enlarged by the washer 81, for example. By widening the end face in this way, the load is more widely dispersed, so that the wear resistance can be further improved.

  In the first and second embodiments described above, an example is shown in which one end of the drive shaft 63 is fixed to the crank body 62 and the other end is connected to the drive body 64 so as to be rotatable and movable in the axial direction. It was. However, the present invention is not limited to such a limitation. One end of the drive shaft 63 is slidably supported by the crank body 62 (rotatable and movable in the axial direction) and the other end is fixed to the drive body 64, or both ends of the drive shaft 63 are the crank body 62 and the drive body. 64 may be slidably supported. That is, the drive shaft 63 is supported by at least one member of the crank body 62 and the drive body 64 so as to be rotatable and movable in the axial direction. When both ends of the drive shaft 63 are slidably supported by the crank body 62 and the drive body 64, the load at the time of discharge may or may not act on the drive shaft 63.

  DESCRIPTION OF SYMBOLS 31 ... Diaphragm pump, 32 ... Motor, 34 ... Diaphragm, 35 ... Rotary shaft, 61 ... Drive mechanism (drive part), 62 ... Crank body, 63 ... Drive shaft, 64 ... Drive body, 41 ... Elastic deformation part, 42 ... Pump chamber, 43 ... Suction valve (pump mechanism), 53 ... Discharge valve (pump mechanism), 63a ... Shaft end face, 65, 68 ... End face, 81 ... Washer.

Claims (3)

A diaphragm having an elastically deforming portion forming a pump chamber;
A crank body that rotates integrally with the rotating shaft of the motor;
A drive shaft inclined at one end connected to an eccentric position of the crank body;
A drive body that is connected to the other end of the drive shaft and the elastic deformation portion and converts the rotation of the crank body into a reciprocating motion in cooperation with the drive shaft;
A pump mechanism that alternately repeats a state in which fluid is discharged from the pump chamber and a state in which fluid is sucked into the pump chamber in accordance with the reciprocating motion of the driver,
A diaphragm pump in which an end face of the crank body facing the drive body and an end face of the drive body facing the crank body are formed in parallel with each other and are slidably in contact with each other. The diaphragm pump according to claim 1, wherein
The drive shaft is connected to at least one member of the crank body and the drive body so as to be rotatable and movable in the axial direction,
A contact portion between a member of the crank body and the drive body that is rotatable with respect to the drive shaft and movable in an axial direction, and a shaft end surface of the drive shaft;
A diaphragm pump, wherein a load during discharge is transmitted to a sliding portion between the crank body and the driving body. The diaphragm pump according to claim 1 or 2,
A diaphragm pump, wherein a washer is interposed in a sliding contact portion between the crank body and the driving body.

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