JP2004183567A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate molding for manufacturing a diaphragm. <P>SOLUTION: A cylindrical mounted body 30 is molded integrally with a lower end of a piston 28 disposed to each diaphragm part of the diaphragm. A mounting hole 16 to which the mounted body 30 is fitted and mounted is disposed to each drive element 15 of a drive body 12 vertically moving the piston of each diaphragm part. Four of elastically deformable pawls 17 project on a periphery of the mounting hole 16 to face the mounting hole 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diaphragm pump provided with a driving body for vertically moving each diaphragm, and more particularly to a mounting structure for attaching a piston of the diaphragm to the driving body.
[0002]
[Prior art]
In a conventional diaphragm pump, a large-diameter head is provided through a small-diameter neck at the lower part of the piston of the diaphragm, and the neck is engaged while the head is elastically deformed in the mounting hole of the driving body. The diaphragm is attached to the driving body by engaging with the lower edge of the attachment hole. (See Patent Document 1).
[0003]
In addition, the applicant has not found a prior art document closely related to the present invention by the time of filing, except for the prior art document specified by the prior art document information described in the present specification. .
[0004]
[Patent Document 1]
Japanese Patent No. 2555177
[Problems to be solved by the invention]
In the above-mentioned conventional diaphragm pump, since a large-diameter head is provided through a small-diameter neck portion below the piston of the diaphragm portion, a molding head is used to form the large-diameter head. There was a problem that the mold had to be forcibly removed by a mold and molding was difficult.
[0006]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to facilitate molding for manufacturing a diaphragm.
[0007]
[Means for Solving the Problems]
In order to achieve this object, an invention according to claim 1 is that a diaphragm having a plurality of diaphragm portions forming a pump chamber, and a piston provided on each diaphragm portion of the diaphragm is attached to move each piston up and down. A driving element for expanding and contracting the pump chamber, a first valve element for preventing a flow from each pump chamber to the suction side, and a second valve element for preventing a flow from the discharge side to the pump chamber. In the diaphragm pump provided with the piston, the piston is provided with a substantially cylindrical mounting body, the driving body is provided with a mounting hole into which the mounting body is press-fitted, and the mounting body is locked on a peripheral edge of the mounting hole. An elastically deformable claw is integrally formed.
Therefore, the attached body inserted into the mounting hole elastically deforms the claw, and the attached body is locked by the elastic return force of the claw.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the pawl is provided so as to protrude from a periphery of the mounting hole.
Therefore, even if the diameter of the mounting hole is substantially the same as the diameter of the body to be mounted, only the tip of the claw faces the mounting hole.
[0009]
According to a third aspect of the present invention, there is provided a diaphragm having a plurality of diaphragm portions forming a pump chamber, and a piston provided on each of the diaphragm portions of the diaphragm is attached to expand and contract the pump chamber by vertically moving each piston. A diaphragm that includes a driving body to be driven, a first valve body that blocks a flow from each of the pump chambers to the suction side, and a second valve body that blocks a flow from the discharge side to the pump chamber. The piston is provided with a substantially cylindrical mounting body, and the driving body is provided with a mounting hole into which the mounting body is press-fitted, and a fitting insertion hole into which the mounting body is fitted is provided. It is provided with a locking piece integrally formed on the periphery with an elastically deformable claw for locking the attached body.
Therefore, when the fitting hole of the locking piece is inserted into the mounting member of the diaphragm press-fitted into the mounting hole of the driving body, the claw is elastically deformed by the mounting member, and the mounting member is locked by the elastic return force of the claw. Is done.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a diaphragm pump according to the present invention, FIG. 2A is a cross-sectional view showing a main part of the same, and FIG. 2B is a view taken on line II (b) in FIG.
Note that `` up, down '' used to describe the direction in the specification is merely for convenience of describing the direction in the figure, and is used when the diaphragm pump according to the present invention is actually used. The upper and lower directions do not always match.
[0011]
In FIG. 1, a diaphragm pump indicated by reference numeral 1 is provided with a motor 2 as a driving source. The motor 2 is fixed to a bottom of the case 4 by screws so that a motor shaft 3 faces the inside of the case 4. I have. The case 4 is formed in a cylindrical shape with a bottom and an open top made of plastic.
[0012]
Reference numeral 5 denotes a crankshaft formed in a substantially small cylindrical shape. A shaft hole 6 to which the motor shaft 3 is fixed is provided substantially in the center of the bottom surface, and a position eccentric from the axis of the shaft hole 6 is provided. , The drive shaft 7 is fixed in an inclined state.
[0013]
Reference numeral 10 denotes a driving body formed by plastic, which is formed by a boss 11 and a main body 12 integrally formed on the upper end of the boss 11, and the driving shaft 7 is rotatably inserted into the boss 11. A shaft hole 13 is provided. Accordingly, by inserting the drive shaft 7 together with the ball 14 into the shaft hole 13 of the drive body 10, the drive body 10 is rotatably supported by the drive shaft 7. The main body 12 is integrally formed by three drivers 15 radially extending at an equal angle in the circumferential direction from the center in plan view, and these three drivers 15 are all arranged from the center toward the tip. It is inclined downward by the same angle, and a mounting hole 16 for mounting each diaphragm portion described later is provided at the tip side of each driver 15. As shown in FIG. 2, four elastically deformable claws 17 project from the lower end of the mounting hole 16 toward the center of the mounting hole 16 at equal angles in the circumferential direction.
[0014]
Reference numeral 20 denotes a diaphragm holder made of plastic, which is formed in a cup shape with an opening at the bottom, and three diaphragm insertion holes 22 are formed in the outer periphery of the ceiling 21 in the circumferential direction in plan view. It is provided at an angle.
[0015]
Reference numeral 25 denotes a diaphragm formed of a flexible material such as rubber. The diaphragm 25 includes three diaphragm portions 26 provided at equal angles in a circumferential direction in a plan view, and upper ends of the three diaphragm portions 26. It is integrally formed with a substantially disk-shaped flange 27 which is continuously provided. A second valve body 32 formed in a cylindrical shape is erected at a central portion of the flange 27 surrounded by the three diaphragm portions 26. A piston 28 having a substantially frustoconical cross section is integrally formed on the lower surface of each diaphragm portion 26, and a substantially columnar mounting body 30 is integrally formed on the lower surface of the piston 28, and the lower surface of the piston 28 is formed integrally with the piston 28. The lower part of the attachment body 30 is formed in a tapered shape.
[0016]
In such a configuration, as shown in FIG. 1, each of the diaphragm portions 26 of the diaphragm 25 is inserted into the diaphragm portion mounting hole 22 of the diaphragm holder 20, and the flange 27 is placed on the ceiling 21 of the diaphragm holder 20. . Next, when the attached bodies 30 of the respective diaphragm portions 26 are press-fitted into the respective attachment holes 16 of the driving body 11 or only the leading end portions are inserted and the leading end portions are gripped and pulled by a tool, FIG. As described above, the peripheral surface of the attached body 30 is pressed against the pawl 17 so that the pawl 17 is elastically deformed. Therefore, the attached body 30 is locked by the elastic return force of the pawl 17, so that the attached body 30 is prevented from falling out of the attachment hole 16, and each diaphragm 26 is attached to each driver 15 of the driver 10. Can be Thereafter, the ball 14 and the driving shaft 7 are inserted into the shaft hole 13 of the driving body 10, and the diaphragm holder 20 is placed on the case 4.
[0017]
Since the mounting member 30 is attached to the mounting hole 16 of the driving body 10 by the pawl 17 in this manner, the mounting member 30 can be formed in a columnar shape. There is no need to provide a projection on the surface. For this reason, it is not necessary to forcibly remove the mold from the molding die to manufacture the diaphragm 25, so that the molding is facilitated.
[0018]
Numeral 40 is a valve holder formed of plastic in a substantially disk shape, having a concave portion 41 on the upper surface, and a column-shaped boss 42 provided in the center of the concave portion 41. At the center of the boss 42, there is provided a hollow portion 43 into which the second valve body 32 of the diaphragm 25 is fitted. At the lower portion of the inner peripheral surface of the hollow portion 43, a groove 44 is formed. Three sets are provided at equal angles to each other in the circumferential direction.
[0019]
A cylindrical portion 45 is integrally provided on the upper surface of the boss 42, and an upper end opening of the cylindrical portion 45 forms a discharge port 46 communicating with the hollow portion 43. Around the boss 42, three mounting holes 47 for mounting a first valve body 50, which will be described later, are provided at equal angles in the circumferential direction, and around each mounting hole 47, a plurality of intake holes are provided. 48 are provided at equal angles in the circumferential direction.
[0020]
In FIG. 1, the first valve body 50 is entirely formed in an umbrella shape using a flexible material such as rubber, and is attached to each of the attachment holes 47 so as to cover the plurality of intake holes 48. . The first valve body 50 attached in this manner is in contact with the surface of the valve holder 40 so as to close a space between a pump chamber 57 and an intake hole 48 described later. Therefore, the first valve body 50 and the surface of the valve holder 40 constitute a check valve that prevents fluid from flowing from the pump chamber 57 to the suction hole 48 described later. Further, the above-described second valve body 32 is in close contact with the wall surface of the hollow portion 43 so as to close the gap between the discharge port 46 and the pump chamber 57. Therefore, the second valve body 32 and the wall surface of the hollow portion 43 constitute a check valve that prevents the flow of the fluid from the discharge port 46 to the pump chamber 57.
[0021]
The valve holder 40 to which the first valve body 50 is assembled is placed on the diaphragm holder 20 as shown in FIG. 1, and the diaphragm 25 is clamped between the diaphragm holder 20 and the valve holder 40. Three pump chambers 57 are formed between each of the diaphragm portions 26 and the valve holder 40.
[0022]
In FIG. 1, reference numeral 60 denotes an intake housing formed in a cup shape with its lower part opened by plastic, and a fitting opening 61 is provided at the center of the ceiling to fit the base of the cylindrical portion 45 of the valve holder 40. A cylindrical portion 62 is provided upright on an outer peripheral portion of the ceiling portion, and an upper end opening of the cylindrical portion 62 communicates with an intake space 65 described later to form an intake port 63.
After the first valve body 50 is attached to the valve holder 40, the intake housing 60 is fixed to the valve holder 40 by welding or the like before being mounted on the diaphragm holder 20.
[0023]
Next, the operation of the diaphragm pump 1 having such a structure will be described with reference to FIG.
When the motor 2 is driven and the motor shaft 3 rotates, the crankshaft 6 also rotates integrally, and a drive shaft 7 that is fixed at a position eccentric from the axis of the shaft hole 6 of the crankcase 6 is fixed to the motor shaft. 3 is eccentrically rotated so as to change the inclination direction. Accordingly, each driver 15 of the driving body 10 rotatably supported by the driving shaft 7 sequentially swings up and down, and this swinging sequentially moves each piston 28 of the diaphragm 25 through the attached body 30. , Each pump chamber 57 expands and contracts sequentially to perform a pump action.
[0024]
When one of the three pistons 28 of the diaphragm 25 descends, the pump chamber 57 expands, so that the pump chamber 57 is in a negative pressure state. At this time, since the second valve body 32 functions as a check valve that regulates the flow of the fluid from the discharge port 46 to the pump chamber 57, the discharge port 46 and the pump chamber 57 are formed by the second valve body 32. Is closed. On the other hand, the first valve body 50 opens the space between the suction hole 48 and the pump chamber 57, so that the fluid flowing into the suction space 65 from the ventilation hole 63 of the cover body 60 expands through the pump chamber 57 expanded from the suction hole 48. Flows into.
[0025]
At the same time, the piston 28 of the other expanded pump chamber 57 rises, so that the pump chamber 57 contracts and the pressure of the fluid in the pump chamber 57 rises. At this time, the first valve body 50 functions as a check valve that prevents fluid from flowing from the pump chamber 57 to the suction hole 48. Is closed. On the other hand, since the second valve body 32 opens the space between the pump chamber 57 and the discharge port 46, the fluid in the pump chamber 57 is pressure-fed to the hollow section 43 through the groove 44 of the hollow section 43 and is discharged. Is discharged from. Since the expansion and contraction operation of the pump chamber 57 is performed sequentially and continuously in each pump chamber 57, the fluid is continuously discharged from the discharge port 60.
[0026]
3A and 3B show a second embodiment of the present invention. FIG. 3A is a cross-sectional view of a main part, and FIG. 3B is a view taken in the direction of arrow III (b) in FIG. .
In the above-described first embodiment, since the claw 17 is directly protruded from the peripheral edge of the mounting hole 16, the claw 17 is elastically deformed by the body 30 to be mounted. It is necessary to make the diameter larger than the diameter of the attached body 30 and to provide a gap δ between the attachment hole 16 and the attached body 30. On the other hand, in the second embodiment, it is not necessary to provide the gap δ.
[0027]
That is, at the lower end of the mounting hole 16 of the driving body 10, an annular concave portion 18 formed with a diameter R3 larger than the diameter R2 of the mounting hole 16 is provided as shown in FIG. Four claws 17 are protruded. Therefore, since the claw 17 can be protruded from the outer periphery of the mounting hole 16 by δ from the outside, even if the diameter R2 of the mounting hole 16 is slightly larger than the diameter R1 of the body 30 to be mounted, the claw 17 Only the distal end faces the mounting hole 16, and the claw 17 is elastically deformed by the mounted body 30 pressed into the mounting hole 16. As described above, since the diameter R2 of the mounting hole 16 can be formed slightly larger than the diameter R1 of the mounted body 30, the mounted body 30 is mounted in a state where the mounting body 30 is tightened with respect to the mounting hole 16. The attached body 30 is firmly attached to the attachment hole 16. In FIG. 1A, reference numeral 17a denotes a die-cutting groove when the nail 17 is manufactured by a metal mold.
[0028]
4A and 4B show a third embodiment of the present invention. FIG. 4A is a sectional view of a main part, FIG. 4B is a bottom view of a locking piece, and FIG. FIG. 4B is a sectional view taken along line IV (c) -IV (c) in FIG.
In the third embodiment, the attached body 30 is attached to the driving body 10 via a locking piece 70 having a circular shape in a plan view manufactured by punching a thin metal plate having spring properties. is there. That is, a fitting hole 71 formed with a diameter R4 larger than the diameter R1 of the attached body 30 is provided at the center of the locking piece 70, and four claws are formed from the periphery of the fitting hole 71. 72 are provided at equal intervals in the circumferential direction so as to be inclined downward by the same angle toward the front end. The diameter R2 of the mounting hole 16 is formed slightly larger than the diameter R1 of the body 30 to be mounted.
[0029]
In such a configuration, the attached bodies 30 of the respective diaphragm portions 26 are press-fitted into the respective attachment holes 16 of the driving body 11 or only the leading end portions are inserted, and the leading end portions are gripped by a tool and pulled. As shown in a), the attached body 30 is fitted into the mounting hole 16 such that the piston 28 of the diaphragm 26 is pressed against the upper surface of the driver 15 of the driver 10. Next, the fitting hole 71 of the locking piece 70 is fitted into the mounted body 30 from the lower end of the mounted body 30, and the locking piece 70 is pressed against the lower surface of the driver 15. Since the tip of the claw 72 faces the mounting hole 16 as shown by the solid line in the figure, the tip of the claw 72 comes into contact with the peripheral surface of the body 30 to be attached. As shown by the dashed line, it is elastically deformed downward, the attached body 30 is locked by the elastic restoring force of the claw 72, and the attachment body 30 is prevented from falling out of the attachment hole 16.
[0030]
At this time, when the claw 72 of the locking piece 70 is locked to the mounted body 30, the distal end of the mounted body 30 is pulled downward, and after the claw 72 is locked to the mounted body 30, When the pulled state is released, the attached body 30 elastically returns slightly upward. The tip of the claw 72 also slightly elastically deforms upward so as to follow the elastic return of the attached body 30, so that the tip of the claw 72 bites into the peripheral surface of the attached body 30, and Are firmly attached by the attachment holes 16.
[0031]
In the present embodiment, the mounted body 30 is formed in a cylindrical shape and only the tip is tapered, but the portion fitted in the mounting hole 16 may be formed in a tapered shape. Any shape may be used as long as the shape is such that it cannot be forcibly removed by a molding die and can be inserted into the mounting hole 16.
[0032]
【The invention's effect】
As described above, according to the present invention, molding for producing a diaphragm can be facilitated.
[0033]
Further, according to the second aspect of the present invention, since the attached body is attached in a state where the attached body is tightened with respect to the attachment hole, the attached body is firmly attached to the attachment hole.
[Brief description of the drawings]
FIG. 1 is a sectional view of a diaphragm pump according to the present invention.
FIG. 2A is a cross-sectional view showing a main part of the diaphragm pump according to the present invention, and FIG. 2B is a view taken along the line II (b) in FIG.
3A and 3B show a second embodiment of the present invention, wherein FIG. 3A is a cross-sectional view of a main part, and FIG. 3B is a view taken along the line III (b) in FIG. is there.
FIGS. 4A and 4B show a third embodiment of the present invention, wherein FIG. 4A is a sectional view of a main part, FIG. 4B is a bottom view of a locking piece, and FIG. FIG. 4 is a sectional view taken along line IV (c) -IV (c) in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 2 ... Motor, 5 ... Crank base, 7 ... Drive shaft, 10 ... Driver, 15 ... Driver, 16 ... Mounting hole, 17, 72 ... Claw, 20 ... Diaphragm holder, 25 ... Diaphragm, 26: diaphragm portion, 28: piston, 30: attached body, 32: second valve body, 50: first valve body, 70: locking piece.

Claims (3)

A diaphragm having a plurality of diaphragm portions forming a pump chamber, a driving body that expands and contracts the pump chamber by moving a piston provided on each diaphragm portion of the diaphragm and moving each piston up and down; and In a diaphragm pump having a first valve body for preventing a flow to an intake side and a second valve body for preventing a flow from a discharge side to the pump chamber, a substantially columnar mounted body is attached to the piston. Wherein a mounting hole into which the mounted body is press-fitted is provided in the driving body, and an elastically deformable claw for locking the mounted body is integrally formed on a periphery of the mounting hole. pump. 2. The diaphragm pump according to claim 1, wherein said pawls are provided so as to protrude from a periphery of said mounting hole. A diaphragm having a plurality of diaphragm portions forming a pump chamber, a driving body that expands and contracts the pump chamber by moving a piston provided on each diaphragm portion of the diaphragm and moving each piston up and down; and In a diaphragm pump having a first valve body for preventing a flow to an intake side and a second valve body for preventing a flow from a discharge side to the pump chamber, a substantially columnar mounted body is attached to the piston. The driving body is provided with a mounting hole into which the mounted body is press-fitted, and a fitting insertion hole into which the mounted body is fitted is provided, and the mounted body is locked to a periphery of the fitted insertion hole. A diaphragm pump comprising a locking piece integrally formed with an elastically deformable claw.

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