JP7382165B2 - Mounting structure of diaphragm pump valve - Google Patents

Description

The present invention relates to a mounting structure for a diaphragm pump valve provided on a gasket.

As a discharge valve used in a diaphragm pump, there is one described in Patent Document 1, for example. The discharge valve disclosed in Patent Document 1 is integrally formed with a gasket that seals an air chamber. This gasket is formed in an annular shape and is sandwiched between a cylindrical wall that forms an air chamber and a plate-like wall that closes an opening at one end of the cylindrical wall. The discharge valve has a plate-shaped portion that protrudes radially inward from the inner peripheral portion of the gasket and overlaps the seat surface of the plate-shaped wall. A through hole for air discharge is opened in the sheet surface.
The discharge valve as disclosed in Patent Document 1 needs to be given a holding force so that the gasket is sandwiched between the cylindrical wall and the plate-like wall and comes into close contact with the seat surface.

Japanese Patent Application Publication No. 2004-346886

In the conventional mounting structure for a discharge valve disclosed in Patent Document 1, there is a possibility that sufficient holding force for bringing the discharge valve into close contact with the seat surface may not be obtained. The reason for this is that the magnitude of the holding force is affected by the amount of compression of the gasket. That is, if the gasket is not sufficiently compressed between the cylindrical wall and the plate-like wall, the holding force acting on the discharge valve may become insufficient.
Therefore, when this discharge valve mounting structure is used in a diaphragm pump with high discharge pressure, the gasket must be thick so that the discharge valve can be pressed against the seat surface with a large holding force, and the pump There is a problem that the gasket becomes larger in the thickness direction.

An object of the present invention is to provide a diaphragm pump valve mounting structure that generates a holding force that brings the valve into close contact with the seat surface without being affected by the amount of compression when the valve is mounted.

In order to achieve this object, a mounting structure for a diaphragm pump valve according to the present invention includes a plate-shaped valve support member having a through hole, and a plate-shaped base that is overlapped with the valve support member, and that extends from the base. A mounting structure for a valve for a diaphragm pump, comprising: a valve having a main body extending in a direction along the valve support member and covering the opening of the through hole; and a pressing member pressing the base of the valve against the valve support member. The main body portion of the valve has a protrusion that protrudes along the pressing member toward a side opposite to the valve supporting member, and the protrusion is configured to allow the pressing member to push the base portion toward the valve supporting member. In the state in which the main body is pressed against the valve supporting member, the main body is pressed by the pressing member in a direction opposite to the pressing member, and the main body is pushed in a direction in which the tip of the main body is pressed against the valve support member.

In the mounting structure of the diaphragm pump valve according to the present invention, the contact portion of the projection with the pressing member may be constituted by a protrusion extending in a direction in which the projection projects from the main body.

The present invention provides the mounting structure for the diaphragm pump valve, in which the pressing member and the valve support member constitute a wall of the fluid chamber, and the base of the valve is configured as a sealing member that seals the fluid chamber. You can leave it there.

In the present invention, the main body portion of the valve is pressed by the protrusion that is displaced in a direction different from the direction in which the base portion of the valve is pressed by the pressing member, and is brought into close contact with the valve support member. Therefore, it is possible to provide a diaphragm pump valve mounting structure that generates a holding force that brings the valve into close contact with the seat surface without being affected by the amount of compression when the valve is mounted.

FIG. 2 is a cross-sectional view of a diaphragm pump to which a discharge valve is attached using the attachment structure according to the present invention. FIG. 3 is an exploded perspective view of main parts. FIG. 2 is a cross-sectional view of a part of the main part viewed from an angle. It is a perspective view of a part of gasket and a discharge valve. FIG. 3 is an enlarged cross-sectional view of a part of the main part. FIG. 2 is a cross-sectional view of essential parts showing an example in which the mounting structure of the present invention is applied to a suction valve.

(First embodiment)
Hereinafter, an embodiment of a mounting structure for a diaphragm pump valve according to the present invention will be described in detail with reference to FIGS. 1 to 5. In this embodiment, an example in which the present invention is applied to a mounting structure for a discharge valve will be described.

The diaphragm pump 1 shown in FIG. 1 is attached to a motor 2 located at the lowest position in FIG. 1, and is driven and operated by the rotation of a crank body 4 attached to a rotating shaft 3 of this motor 2. In FIG. 1, a part of the diaphragm pump 1 is shown with a different broken position so that both a discharge valve 5 and a suction valve 6, which will be described later, are visible. The diaphragm pump 1 according to this embodiment is a pump that sucks in and discharges air.
This diaphragm pump 1 includes a housing 7 fixed to a motor 2. Functional parts constituting this diaphragm pump 1 are held in this housing 7.

The housing 7 is formed by combining a plurality of members in the axial direction of the motor 2 (vertical direction in FIG. 1). A plurality of members constituting the housing 7 are arranged between a bottomed cylindrical mount 11 attached to the motor 2, a diaphragm holder 12 attached to the opening of the mount 11, and the diaphragm holder 12. These include a plate-shaped valve holder 14 attached to the diaphragm holder 12 with a diaphragm 13 (described later) sandwiched therebetween, and a silencer 15 attached so as to overlap this valve holder 14.

The crank body 4 supports a drive body 22 via a drive shaft 21. The drive shaft 21 is fixed to the crank body 4 in an inclined state with respect to the axis C of the crank body 4. The direction in which the drive shaft 21 is inclined is the direction in which the amount of eccentricity of the crank body 4 with respect to the axis C at the tip of the drive shaft 21 is reduced.
The drive body 22 includes a cylindrical shaft portion 22a that is rotatably connected to the drive shaft 21, and a plurality of arm portions 22b that protrude outward in the radial direction from the shaft portion 22a. The arm portion 22b is provided for each pump chamber 23, which will be described later, and is engaged with a connecting piece 24 for each pump chamber 23 of the diaphragm 13, which will be described later.

Although not shown in the drawings, the mount 11 is formed with an inlet that communicates between the inside and outside of the mount 11.
The diaphragm holder 12 includes a plurality of cylindrical cylinders 25 (one cylinder 25 is shown in FIG. 1) and a plurality of first through holes 26 located between the cylinders 25. ing. The diaphragm holder 12 according to this embodiment is provided with three cylinders 25 and three first through holes 26.

The diaphragm 13 includes a plate-shaped portion 13a held between the diaphragm holder 12 and the valve holder 14, and a plurality of deformed portions 13b (at three locations) that cooperate with the valve holder 14 to form a pump chamber 23. , and a plate-shaped suction valve 6 provided between the deformed portions 13b. The deformed portion 13b is formed into a cup shape that opens toward the valve holder 14, and is inserted into a cylinder 25 provided in the diaphragm holder 12.
The opening of the deformed portion 13b is closed by the bulb holder 14. A piston 27 and the above-mentioned connecting piece 24 are protruded from each of the three deformed portions 13b.

The suction valve 6 is for opening and closing a suction passage 28 formed by the first through hole 26 of the diaphragm holder 12. The suction valve 6 according to this embodiment is formed into a plate shape that crosses the through hole 29 of the diaphragm 13, and covers the seat surface 12a of the diaphragm holder 12 (the motor 2) so as to cover the first through hole 26 of the diaphragm holder 12. (on the opposite side).

The bulb holder 14 is formed into a disk shape, as shown in FIG. A second through hole 31 is formed in a portion of the valve holder 14 that becomes the wall of the pump chamber 23 . In this embodiment, the second through hole 31 corresponds to the "through hole" in the present invention. An air passage 33 consisting of a recess 32 is formed in a portion of the diaphragm 13 in the valve holder 14 that faces the intake valve 6 . Although not shown in detail, the air passage 33 communicates the through hole 29 of the diaphragm 13 with one pump chamber 23 adjacent to the through hole 29. The air passage 33, the through hole 29 of the diaphragm 13, and the suction valve 6 are provided for each of the three pump chambers 23.

As shown in FIG. 2, the upper surface of the valve holder 14 (the surface opposite to the motor 2) has an annular flat surface 35 on which a gasket 34, which will be described later, is stacked, and a flat surface 35 at a predetermined interval in the circumferential direction of the valve holder 14. A plurality of guides 36 lined up at intervals and a sheet surface 37 in which the second through hole 31 opens are formed. The plurality of guides 36 are for determining the mounting position of a gasket 34, which will be described later. In this embodiment, the valve holder 14 corresponds to the "valve support member" in the present invention.

The silencer 15 is formed into a cylindrical shape with a bottom that opens toward the bulb holder 14 . A discharge pipe 41 that protrudes toward the side opposite to the motor 2 is integrally formed in the center of the silencer 15 . Further, inside the silencer 15, as shown in FIG. 2, a cylindrical partition wall 42 is provided. This partition 42 cooperates with the bulb holder 14 to form an air chamber 43 (see FIG. 1). A gasket 34 is provided between the partition wall 42 and the bulb holder 14. In this embodiment, the partition wall 42 corresponds to the "pressing member" according to the present invention, and the air chamber 43 corresponds to the "fluid chamber" according to the present invention.

The gasket 34 is formed in an annular shape as shown in FIG. The material forming the gasket 34 is a rubber material containing an elastomer. This gasket 34 is formed to include a part of the discharge valve 5, which will be described later. To explain in detail, the gasket 34 is formed into an annular plate shape including the base 5a of the discharge valve 5. Protrusions 44 for positioning are provided on the outer periphery of the gasket 34 at positions dividing the outer periphery into three equal parts. This projecting piece 44 is inserted between two guides 36, 36 provided on the bulb holder 14, and determines the position of the gasket 34 in the circumferential direction of the bulb holder 14.

The discharge valve 5 is for opening and closing a discharge passage 45 formed by the second through hole 31 of the valve holder 14, and is connected to the diaphragm by a mounting structure 46 (see FIG. 3) that includes the valve holder 14 and the partition wall 42 of the silencer 15. It is attached to pump 1. In this embodiment, the discharge valve 5 corresponds to the "valve" in the present invention. The discharge valves 5 are provided at positions dividing the gasket 34 into three equal parts in the circumferential direction. The discharge valve 5 according to this embodiment is arranged at the same position as the positioning protrusion 44 in the circumferential direction of the gasket 34.

The discharge valve 5 includes a base portion 5 a that constitutes a part of the gasket 34 , and a main body portion 5 b that extends from the base portion 5 a in a direction along the valve holder 14 and covers the opening of the second through hole 31 . Since the base portion 5a is a part of the gasket 34, it constitutes a sealing member that seals the air chamber 43. The main body portion 5b is formed of a substantially semicircular plate, and is in close contact with the seat surface 37 of the valve holder 14 in a state where the gasket 34 is sandwiched between the valve holder 14 and the partition wall 42. As shown in FIG. 5, the main body portion 5b according to this embodiment is formed into a curved shape that forms part of a spherical surface.

Further, the main body portion 5b is provided with a protrusion 47 that protrudes toward the side opposite to the bulb holder 14. The protrusion 47 is formed at a position along the inner circumferential surface 42a of the partition wall 42 of the silencer 15 when the silencer 15 is attached to the valve holder 14 via the gasket 34, as shown in FIG. That is, the protrusion 47 protrudes from the main body portion 5b along the partition wall 42 toward the side opposite to the bulb holder 14. An inclined surface 48 (see FIG. 4) is formed at the protruding end of the protrusion 47 in a portion adjacent to the partition wall 42. As shown in FIG. This inclined surface 48 is inclined so as to gradually move away from the partition wall 42 as it moves away from the main body portion 5b. Therefore, in the process of assembling the silencer 15 to the valve holder 14, the tip of the partition wall 42 can be guided to the outside of the projection 47 by the inclined surface 48.

The contact portion of the protrusion 47 with the partition wall 42 is constituted by a protrusion 51, as shown in FIGS. 3 and 4. The protrusion 51 is formed so as to extend in the direction in which the protrusion 47 protrudes from the main body portion 5b (in the vertical direction in FIG. 4). Further, the protrusion 51 is formed so as to be pushed radially inward by the partition wall 42 and elastically deformed in the process of assembling the silencer 15 to the valve holder 14 . When the protrusion 51 is pushed radially inward by the partition wall 42, the protrusion 47 is displaced in the same direction, and accordingly, the main body portion 5b is inclined around the boundary with the base portion 5a. Become.

At this time, the direction in which the main body portion 5b is inclined is the direction in which the tip of the main body portion 5b is pressed against the seat surface 37. In the discharge valve 5 according to this embodiment, a step 52 (see FIG. 5) is formed between the base 5a and the main body 5b so that the main body 5b is easily inclined. The step 52 is formed such that the main body portion 5b is separated from the seat surface 37 by a predetermined gap. The fact that the main body portion 5b is tilted toward the seat surface 37 means that the holding force that presses the main body portion 5b against the seat surface 37 is increasing.

The width (the length in the circumferential direction of the partition wall 42) and the height (the length in the radial direction of the partition wall 42) of the protrusion 51 affect the magnitude of the holding force that presses the main body portion 5b against the seat surface 37 of the valve holder 14. effect. If a large holding force is required, at least one of the width and length of the protrusion 51 is formed relatively long. If the holding force is relatively small, the width and length of the protrusion 51 are formed relatively short.

In the diaphragm pump 1 configured in this manner, the rotation of the rotation shaft 3 of the motor 2 causes the crank body 4 and the drive shaft 21 to rotate around the rotation shaft 3. At this time, since the rotation of the drive body 22 is restricted by the diaphragm 13, the drive body 22 swings as the direction in which the drive shaft 21 is tilted changes. Due to this rocking, the deformed portion 13b of the diaphragm 13 is pushed or pulled by the piston 27. Therefore, the driver 22 converts the rotation of the rotary shaft 3 into reciprocating motion and transmits it to the deforming portion 13b. When the deformed portion 13b of the diaphragm 13 is pulled toward the motor 2 by the piston 27 and expanded, the volume of the pump chamber 23 increases, the suction valve 6 opens, and the air in the mounting base 11 passes through the suction passage 28. It is sucked into the pump chamber 23.

On the other hand, as the deformed portion 13b of the diaphragm 13 is pushed toward the valve holder 14 by the piston 27, the deformed portion 13b is contracted and the volume of the pump chamber 23 is reduced, and the discharge valve 5 is opened to remove the air inside the pump chamber 23. is discharged into the air chamber 43 through the discharge passage 45. As the crank body 4 continuously rotates, a state in which air is sucked and a state in which air is discharged are alternately repeated in all pump chambers 23, and the air in the air chambers 43 is transferred to the discharge pipe 41. It is discharged from.

The main body portion 5b of the discharge valve 5 according to this embodiment is oriented in a direction (direction toward the center of the diaphragm pump 1) that is different from the direction in which the base portion 5a of the discharge valve 5 is pushed by the partition wall 42 (vertical direction in FIG. 1). It is pushed by the displaced protrusion 47 and comes into close contact with the seat surface 37 of the bulb holder 14 . That is, the pressing force directed inward in the radial direction of the partition wall 42 is converted into a pressing force in the axial direction of the motor 2, which is applied to the main body portion 5b.
Therefore, it is possible to provide a diaphragm pump valve mounting structure that generates a holding force that brings the discharge valve 5 into close contact with the seat surface 37 without being affected by the amount of compression of the base 5a when the discharge valve 5 is mounted.

In the diaphragm pump valve mounting structure 46 according to this embodiment, the contact portion of the protrusion 47 with the partition wall 42 is constituted by a protrusion 51 extending in the direction in which the protrusion 47 protrudes from the main body portion 5b. Therefore, the magnitude of the holding force that brings the main body portion 5b of the discharge valve 5 into close contact with the seat surface 37 can be easily adjusted by changing the size of the protrusion 51.

The partition wall 42 of the silencer 15 and the valve holder 14 according to this embodiment constitute the wall of the air chamber 43 on the discharge side. The base portion 5a of the discharge valve 5 is configured as a sealing member that seals the air chamber 43. Therefore, the holding force that presses the main body 5b of the discharge valve 5 against the seat surface 37 is not affected by the amount of compression of the gasket 34, so even if a large holding force is required, the thickness of the gasket 34 is not required. There is no need to make it any thicker. Therefore, according to this embodiment, it is possible to downsize a diaphragm pump with a high discharge pressure.

In this embodiment, an example is shown in which the contact portion of the protrusion 47 with the partition wall 42 is constituted by the protrusion 51, but the side surface of the protrusion 47 may directly contact the partition wall 42 without providing the protrusion 51. It can also be configured to do so.
Moreover, in the embodiment described above, an example was shown in which the present invention is applied to the diaphragm pump 1 having three pump chambers 23. However, the invention is not limited to the number of pump chambers. That is, the present invention can also be applied to a diaphragm pump having two or less pump chambers or four or more pump chambers.

(Second embodiment)
The mounting structure for a diaphragm pump valve according to the present invention can be applied to a suction valve as shown in FIG. In FIG. 6, the same or equivalent members as those explained with reference to FIGS. 1 to 5 are given the same reference numerals, and detailed explanations are omitted as appropriate.

The valve holder 14 shown in FIG. 6 has a projecting wall 61 that presses the base 6a of the suction valve 6 against the diaphragm holder 12. In this embodiment, the diaphragm holder 12 corresponds to the "valve support member" according to the present invention, and the projecting wall 61 corresponds to the "pressing member" according to the present invention. Further, the first through hole 26 of the diaphragm holder 12 corresponds to the "through hole" in the present invention.

The suction valve 6 shown in FIG. 6 has a protrusion 62 that protrudes along a projecting wall 61 in a direction away from the diaphragm holder 12. During the process of assembling the valve holder 14 to the diaphragm 13, the protrusion 62 is pushed by the protruding wall 61 and is displaced in a direction away from the protruding wall 61 (to the left in FIG. Push toward holder 12.

Therefore, similarly to the discharge valve 5 according to the first embodiment, the magnitude of the holding force that presses the main body portion 6b of the suction valve 6 against the diaphragm holder 12 is not affected by the amount of compression of the diaphragm 13. That is, it becomes possible to adjust the holding force of the suction valve 6 without changing the thickness of the diaphragm 13.
Although not shown in FIG. 6, the contact portion of the protrusion 62 of the suction valve 6 with the protruding wall 61 may be constituted by the protrusion 51 similarly to the discharge valve 5 according to the first embodiment. Can be done.

DESCRIPTION OF SYMBOLS 1... Diaphragm pump, 5... Discharge valve (valve), 5a... Base, 5b... Main body, 6... Suction valve (valve), 12... Diaphragm holder (valve support member), 14... Valve holder (valve support member), 26... First through hole, 31... Second through hole, 34... Gasket (sealing member), 42... Partition wall (pressing member), 43... Air chamber (fluid chamber), 46... Mounting structure, 47, 62... Projection, 51... Protrusion, 61... Projection wall (pressing member).

Claims (3)

a plate-shaped valve support member having a through hole;
a valve having a plate-shaped base overlapped with the valve support member, and a main body extending from the base in a direction along the valve support member to cover the opening of the through hole;
A mounting structure for a diaphragm pump valve, comprising a pressing member that presses the base of the valve against the valve support member,
The main body portion of the valve has a protrusion that protrudes toward a side opposite to the valve support member along the pressure member while being in contact with and adjacent to the pressure member in the direction along the valve support member. ,
The protrusion is pressed by the pressing member toward a side opposite to the pressing member while the pressing member is pressing the base against the valve support member ,
A pressing force applied to the protrusion from the pressing member in a direction along the valve supporting member is converted into a pressing force in a direction toward the valve supporting member and applied to the main body, so that the tip of the main body is A mounting structure for a valve for a diaphragm pump, characterized in that the holding force for pressing the main body portion against the valve support member is increased by being pushed in a direction in which the main body portion is pressed against the valve support member .
The mounting structure for a diaphragm pump valve according to claim 1,
A mounting structure for a valve for a diaphragm pump, wherein a contact portion of the protrusion with the pressing member is constituted by a protrusion extending in a direction in which the protrusion protrudes from the main body. The mounting structure for a diaphragm pump valve according to claim 1 or 2,
The pressing member and the valve support member constitute a wall of a fluid chamber,
A mounting structure for a valve for a diaphragm pump, wherein the base portion of the valve is configured as a sealing member that seals the fluid chamber.

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