JP2006170040A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent collision between a driving body and a diaphragm holder, and occurrence of noise due to collision between the driving body and a drive shaft during a pumping operation. <P>SOLUTION: The diaphragm pump is equipped with a crank base 7 journaled to a motor shaft 4, the drive shaft 8 journaled to a part eccentric from the center of the crank base 7, and the driving body 9 rotatably inserted in a shaft hole 10 of the driving body 9. A lower side of a diaphragm part 19 of a diaphragm 18 is mounted on the tip end of a driving element 13 of the driving body 9. A transfer restricting member 41 formed of an elastic material and mounted on a ceiling part 16 of the diaphragm holder 15 is interposed between the ceiling part 16 and the driving body 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes a driving body that swings through a drive shaft that rotates in an inclined state using a motor as a driving source, and a diaphragm portion of a diaphragm attached to the driving body is reciprocated by the swinging operation of the driving body. The present invention relates to a diaphragm pump that pumps by expanding and contracting the pump chamber.

  FIG. 4 is a cross-sectional view of a conventional one-cylinder diaphragm pump constituted by one pump chamber. In addition, "upper, lower" used for explaining the direction in the specification means the direction in the figure for convenience of explanation, and when actually using the diaphragm pump according to the present invention, The direction below does not necessarily match.

  In the figure, a conventional diaphragm pump denoted as a whole by reference numeral 101 includes a motor 2 as a drive source, and the motor 2 has a bottom portion 5 of a case 3 formed in a bottomed rectangular tube shape opened upward. The motor shaft 4 is attached so as to face the case 3 through a hole 6 formed in the bottom 5 of the case 3. The crank base denoted by reference numeral 7 in the same figure is formed in a small cylindrical shape, and a motor shaft 4 is fixed to the center, and the drive shaft 8 is inclined at a position eccentric from the axis of the motor shaft 4. It is fixed with.

  Reference numeral 9 denotes a driving body, which is formed by a boss 11 provided with a shaft hole 10 formed of a non-through hole that opens downward, and a main body 12 integrally formed at the upper end of the boss 11. 10, the drive shaft 8 is rotatably inserted. The main body 12 is integrally formed with one driver element 13 extending in one direction from the center in plan view, and this driver element 13 is inclined downward from the center toward the tip. Reference numeral 15 denotes a diaphragm holder, which is formed in a box shape having an opening at the bottom, and a diaphragm portion holding hole 17 is provided in the ceiling portion 16. This diaphragm holder 15 is formed on the case 3 described later. The diaphragm 18, the valve holder 25, and the lid 30 are fixed together.

  Reference numeral 18 denotes a diaphragm, which is made of an elastic material such as rubber, and has a single diaphragm portion 19 that opens upward, a flange 20 that is connected to the upper end portion of the diaphragm portion 19 and has a substantially rectangular shape, and a diaphragm portion. A piston 21 having a substantially frustoconical cross section is formed integrally with a lower portion 19. In the diaphragm 18, the lower end portion of the piston 21 is attached to the front end portion of the driver 13, and the diaphragm portion 19 is inserted into the diaphragm portion holding hole 17 of the diaphragm holder 15, whereby the ceiling portion 16 of the diaphragm holder 15. Placed on top.

  Reference numeral 22 denotes a suction side valve body, which is formed in an umbrella shape from a flexible material such as rubber. Reference numeral 23 denotes a discharge-side valve body, which is formed in a substantially hat shape with a hook by a flexible material such as rubber. Reference numeral 25 denotes a rectangular valve holder formed in a substantially flat plate shape, and a pair of partition walls 26, 26 opposed to each other are integrally erected, and the discharge side valve element is provided at the center of the valve holder 25. The engaging convex part 27 to which 23 is crowned is projected integrally.

  Between the pair of partition walls 26, 26 of the valve holder 25, a discharge side valve hole 28 that is closed by the discharge side valve body 23 is provided, and the outside of the partition wall 26 is closed by the suction side valve body 24. The suction side valve hole 29 is provided. Reference numeral 30 denotes a lid formed in a substantially box shape with an opening at the bottom, and a cylindrical cylinder 31 is erected integrally at the center, and the upper end opening of the cylinder 31 forms a discharge port 32. A suction port 33 is provided on one end side.

  In such a configuration, the valve holder 25 to which the suction side valve body 22 and the discharge side valve body 23 are attached is placed on the diaphragm 18 placed on the diaphragm holder 15. Next, by covering the valve holder 25 with the lid body 30, a suction space 35 communicating with the suction port 33 and the suction side valve hole 29 is formed in a space surrounded by the outside of the partition walls 26, 26 and the lid body 30. The At the same time, a valve chamber 36 that connects the discharge port 32 and the discharge-side valve hole 28 is formed in a space surrounded by the inside of the partition walls 26, 26 and the lid 30.

  A pump chamber is provided between the diaphragm portion 19 of the diaphragm 18 and the valve holder 25 by attaching the lid 30 to the case 3 by a well-known method using a through bolt, a leaf spring, or a wire spring (not shown). 37 is formed.

  In the diaphragm pump 101 configured as described above, when the motor 2 is driven and the motor shaft 4 rotates, the crank base 7 also rotates integrally, and the crank base 7 is inclined to a position eccentric from the axis of the motor shaft 4. The drive shaft 8 fixed in this state rotates eccentrically around the motor shaft 4 so as to change the inclination direction. Accordingly, the driving element 13 of the driving body 9 rotatably supported by the driving shaft 8 swings up and down, and the diaphragm portion 19 of the diaphragm 18 also moves up and down along with this swinging, so that the pump chamber 37 contracts.・ Expands and pumps.

  That is, when the diaphragm portion 19 of the diaphragm 18 is lowered, the pump chamber 37 is expanded, so that the pump chamber 37 is in a negative pressure state. At this time, the discharge-side valve element 23 functions as a check valve that regulates the flow of air from the valve chamber 36 to the pump chamber 37 through the discharge-side valve hole 28. The valve hole 28 is closed. On the other hand, since the suction side valve element 22 opens between the suction side valve hole 29 and the pump chamber 37, air is sucked into the pump chamber 37 from the suction side valve hole 29.

  When the output shaft 4 of the motor 2 further rotates and the diaphragm portion 19 rises, the pump chamber 37 contracts, so that the air pressure in the pump chamber 37 rises. At this time, the suction side valve body 22 functions as a check valve that restricts the flow of air from the pump chamber 37 to the suction side valve hole 29. 29 is closed. On the other hand, since the discharge-side valve element 23 opens the space between the discharge-side valve hole 28 and the valve chamber 36, the air in the pump chamber 37 flows into the valve chamber 36 through the discharge-side valve hole 28 and discharge port 32. It is discharged from. The above-described prior art is not known in the literature as long as the applicant knows at the time of filing. Further, the applicant has not been able to find prior art documents related to the present invention by the time of filing. Therefore, prior art document information is not disclosed in this specification.

  In the conventional diaphragm pump described above, when the diaphragm portion 19 of the diaphragm 18 is lowered and the pump chamber 37 is expanded, the pump chamber 37 is in a negative pressure state, so that the driver 9 is lifted. For this reason, the drive body 9 collides with the lower end 17 a of the diaphragm portion holding hole 17 of the diaphragm holder 15. On the other hand, when the diaphragm part 19 rises and the pump chamber 37 contracts, the pressure of the air in the pump chamber 37 rises, so that the driver 9 is pushed down. For this reason, the ceiling portion 10 a of the shaft hole 10 of the drive body 9 collides with the upper end 8 a of the drive shaft 8. When this collision is repeated, there is a problem that a collision sound is continuously generated and appears as noise.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to prevent generation of noise due to collision between the drive body and the diaphragm holder and collision between the drive body and the drive shaft during the pump operation. There is to do.

  In order to achieve this object, the invention according to claim 1 is a crank base that rotates using a motor as a drive source, a drive shaft that is attached in an inclined state to a portion eccentric from the rotation center of the crank base, A drive body having a shaft hole for rotatably inserting a drive shaft, a diaphragm attached to the drive body and having a diaphragm portion that expands and contracts as the crank base rotates, and a diaphragm that mounts the diaphragm In the diaphragm pump including the diaphragm holder, a movement restricting member for restricting movement of the drive body in the axial direction of the drive shaft is interposed between the drive body and the diaphragm holder.

  The invention according to claim 2 is the invention according to claim 1, wherein the movement restricting member is formed of an elastic material.

  According to a third aspect of the present invention, there is provided a crank table that rotates using a motor as a drive source, a drive shaft that is attached to a portion that is eccentric from the rotation center of the crank table, and a shaft hole into which the drive shaft is loosely inserted. A diaphragm pump comprising: a drive body having a diaphragm; a diaphragm having a diaphragm portion that is attached to the drive body and expands and contracts as the crank table rotates; and a diaphragm holder that holds the diaphragm. The diaphragm holder is provided with a hole, and the diaphragm is integrally provided with a movement restricting portion that faces the hole and restricts the movement of the driving body in the axial direction of the driving shaft.

  According to the first aspect of the invention, since the movement restricting member restricts the movement of the drive shaft in the axial direction, the collision between the drive body and the diaphragm holder and the collision between the drive body and the drive shaft are prevented. Therefore, noise generated by this collision can be prevented.

  According to the second aspect of the present invention, the movement restricting member in contact with the driving body is elastically deformed, so that the driving body is smoothly swung.

  According to the invention of claim 3, by forming the movement restricting portion integrally with the diaphragm, not only the number of parts can be reduced but also the number of assembling steps can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a diaphragm pump according to the present invention. In the figure, the same or equivalent members described in the prior art shown in FIG. 4 described above are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate. A feature of the present invention is that the movement restricting member 41 interposed between the main body 12 of the driving body 9 and the ceiling portion 16 of the diaphragm holder 15 is formed in a rectangular parallelepiped shape by an elastic material such as rubber, and an adhesive. Is attached to the center of the lower surface of the ceiling 16 of the diaphragm holder 15. The drive body 9 is sandwiched between the movement restricting member 41 and the drive shaft 8, and the movement of the drive shaft 8 in the axial direction is restricted, and the movement restricting member 41 restricts the ceiling portion 10 a of the shaft hole 10 of the drive body 9. Is kept in contact with the upper end 8 a of the drive shaft 8.

  With this configuration, when the diaphragm portion 19 of the diaphragm 18 descends and the pump chamber 37 expands, the pump chamber 37 enters a negative pressure state, but the drive body 9 is lifted by the movement restricting member 41. Is regulated. For this reason, the drive body 9 does not collide with the lower end 17a of the diaphragm holding hole 17 of the diaphragm holder 15. On the other hand, when the diaphragm part 19 rises and the pump chamber 37 contracts, the pressure of the air in the pump chamber 37 rises, but the ceiling part 10a of the shaft hole 10 of the drive body 9 is driven by the movement restricting member 41 into the drive shaft. 8 is maintained in contact with the upper end 8a of the drive body 9, so that the ceiling 10a of the shaft hole 10 of the drive body 9 does not collide with the upper end 8a of the drive shaft 8.

  Accordingly, it is possible to prevent noise generated when the driving body 9 collides with the diaphragm holder 15 or when the driving body 9 collides with the driving shaft 8 during the pumping action of the diaphragm pump 1. In addition, since the movement restricting member 41 is formed of an elastic material, the movement restricting member 41 that is in contact with the drive body 9 is elastically deformed when the drive body 9 is swung. It is done smoothly.

  FIG. 2 is a sectional view showing a second embodiment of the present invention. In the diaphragm pump 51 according to the second embodiment, a hole 15a is provided in a substantially central portion of the diaphragm holder 15. The diaphragm 18 faces the hole 18a from the hole 15a and contacts the upper end of the main body 12 of the driver 9. The movement restricting portion 18a for restricting the movement of the drive shaft 8 in the axial direction is integrally projected. The drive body 9 is sandwiched by the movement restricting portion 18a and the drive shaft 8, and the drive body 9 is restricted from moving in the axial direction of the drive shaft 8. The drive restricting portion 18a causes the drive body 9 to move. The state where the ceiling portion 10 a of the shaft hole 10 is in contact with the upper end 8 a of the drive shaft 8 is maintained.

  Therefore, similarly to the first embodiment described above, noise generated by the driving body 9 colliding with the diaphragm holder 15 or the driving body 9 colliding with the driving shaft 8 during the pumping action of the diaphragm pump 1 is generated. Can be prevented. In the second embodiment, by forming the movement restricting portion 18a integrally with the diaphragm 18, it is possible not only to reduce the number of parts but also to reduce the assembly man-hours.

  FIG. 3A is a cross-sectional view of a main part showing a third embodiment of the present invention. In the third embodiment, a hemispherical small protrusion 12a is formed on the upper end of the main body 12 of the driving body 9, this small protrusion 12a is brought into contact with the movement restricting member 41, and this small protrusion 12a is driven. The swinging fulcrum of the body 9 is used. In this way, the driving body 9 is not brought into contact with the movement restricting member 41 by a surface but by a point, so that the driving body 9 can be made smooth even though the driving body 9 is in contact with the movement restricting member 41. Oscillating motion can be obtained.

  FIG. 3B is a cross-sectional view of a main part showing a fourth embodiment of the present invention. In the fourth embodiment, a convex portion 16a is integrally provided at a substantially central portion of the ceiling portion 16 of the diaphragm holder 15, and a hemispherical concave portion 12b is provided at the upper end of the main body 12 of the driving body 9. A spherical body 42 is interposed between 16a and the recess 12b. As described above, by using the spherical body 42 as the swing fulcrum of the drive body 9, the smooth swing operation of the drive body 9 can be obtained as in the third embodiment described above.

  In this embodiment, an example in which the present invention is applied to a one-cylinder diaphragm pump has been described. However, the present invention can also be applied to a case where a diaphragm pump having two or more cylinders is used as a negative pressure pump, and a diaphragm pump having two or more cylinders can be used. In a model that is used as a positive pressure pump and the pressure on the exhaust side is relatively low, the drive body 9 may be lifted, and this is applicable to such a model.

It is a sectional side view of the diaphragm pump concerning the present invention. It is sectional drawing which shows the 2nd Embodiment of this invention. FIG. 4A is a cross-sectional view of a main part showing a third embodiment of the present invention, and FIG. 4B is a cross-sectional view of a main part showing a fourth embodiment of the present invention. It is sectional drawing of the conventional 1 cylinder diaphragm pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,51 ... Diaphragm pump, 2 ... Motor, 7 ... Crank stand, 8 ... Drive shaft, 9 ... Drive body, 10 ... Shaft hole, 15 ... Valve holder, 15a ... Hole, 18 ... Diaphragm, 18a ... Movement control part, 19 ... Diaphragm part, 37 ... Pump chamber, 41 ... Movement control member.

Claims (3)

  A crank base that rotates using a motor as a drive source, a drive shaft that is attached to a portion that is eccentric from the center of rotation of the crank base, and a drive body that has a shaft hole into which the drive shaft is rotatably inserted; In a diaphragm pump comprising a diaphragm portion attached to the drive body and having a diaphragm portion that expands and contracts as the crank base rotates, and a diaphragm holder on which the diaphragm is placed, the drive body and the A diaphragm pump characterized in that a movement restricting member for restricting movement of the drive shaft in the axial direction of the drive shaft is interposed between the diaphragm holder and the diaphragm holder.   2. The diaphragm pump according to claim 1, wherein the movement restricting member is made of an elastic material. A crank base that rotates using a motor as a drive source, a drive shaft that is attached to a portion that is eccentric from the center of rotation of the crank base, a drive body that has a shaft hole into which the drive shaft is loosely inserted, and this drive In a diaphragm pump having a diaphragm portion that is attached to the body and expands and contracts as the crank table rotates and performs a pump action, and a diaphragm holder that holds the diaphragm, a hole is provided in the diaphragm holder, A diaphragm pump characterized in that a movement restricting portion that faces the diaphragm from the hole and restricts the movement of the drive body in the axial direction of the drive shaft is integrally provided.

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