JP2012021482A - Diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealability by a discharging valve element and to improve a function as a check valve.SOLUTION: Discharging valve elements 25 are formed integrally with a flange 15 in the outer periphery thereof through connection pieces 27 by being surrounded by arc-like cutouts 26. A pressing object projection 28 is projected on each connection piece 27. In a part of the pressing object projection 28 pressed by a pressing projection part 11, an inclined surface 28 descending toward a tip side of the discharging valve element 25 is formed.

Description

  The present invention relates to a diaphragm pump including a pump chamber formed and expanded / contracted by a diaphragm.

  As a conventional diaphragm pump, a diaphragm having a plurality of diaphragm portions forming a pump chamber, a driver that expands and contracts the pump chamber by vertically moving each diaphragm portion of the diaphragm, and each pump chamber and a discharge side A partition plate provided with a suction passage and a discharge passage corresponding to each pump chamber, a suction valve body for restricting a back flow of fluid from the pump chamber to the suction passage, and from the discharge passage to the pump chamber And a discharge valve body that regulates the backflow of fluid to the diaphragm, and this discharge valve body is formed integrally with a diaphragm via a connecting piece (for example, see Patent Document 1).

JP 2004-225607 A

  The conventional diaphragm pump as described above has a structure in which the discharge valve body is connected to the flange of the diaphragm via three connecting pieces arranged at equal angles in the circumferential direction. Because it does not have a structure that presses the discharge valve body in the direction to restrict the back flow of fluid, the sealing performance by the discharge valve body is not sufficient, and as a check valve that restricts the back flow from the discharge passage to the pump chamber There was a problem that the function of was not enough.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to improve the sealing performance by the discharge valve body and to improve the function as a check valve.

  In order to achieve this object, the present invention provides a pump chamber that is formed by a diaphragm portion of a diaphragm, expands and contracts by reciprocating movement of the diaphragm portion, a suction passage for sucking fluid into the pump chamber, and the pump chamber. A discharge passage for discharging the fluid, a suction valve body for restricting the backflow of the fluid from the pump chamber to the suction passage, and a discharge valve for restricting the backflow of the fluid from the discharge passage to the pump chamber In the diaphragm pump comprising a body, the discharge valve body is formed integrally with the diaphragm through a single connecting piece, and includes a pressing member that presses the discharge valve body toward the discharge path, The valve body is provided with a pressed protrusion that is pressed by the pressing member, and the pressed protrusion is positioned at the end of the discharge valve body on the connecting piece side, and the pressed protrusion At a site member presses, in which pressing force by the pressing member is provided with the inclined surface that acts only on the discharge valve side.

  According to the present invention, in the above invention, the discharge valve body is formed in an arcuate shape whose cross section is curved toward the pressing member.

  The present invention provides the discharge valve according to any one of the above-mentioned inventions, wherein the discharge valve element is provided in the diaphragm at an equal angle in the circumferential direction, and the suction valve element is adjacent in the circumferential direction. A plurality of the diaphragms are integrally provided so as to be positioned between the bodies.

  According to the present invention, since the discharge valve element is pressed against the peripheral edge of the opening of the discharge passage by the pressing force of the pressing member, the sealing performance by the discharge valve element is improved. Further, since the inclined surface on which the pressing force by the pressing member acts only on the discharge valve body side is provided on the pressed protrusion, the pressing force of the pressing member does not act on the connecting piece side. For this reason, since the connecting piece is not bent or lifted from the periphery of the opening of the discharge path, the connecting piece is kept in close contact with the periphery of the opening of the discharge path. The sealing performance by the body is improved.

  According to one of the inventions, since the discharge valve body is previously formed in an arcuate shape whose cross section is curved toward the pressing member, the discharge valve body is flattened by the pressing force of the pressing member. By elastically deforming, the close contact with the periphery of the opening of the discharge passage is improved, so that the sealing performance by the discharge valve body is further improved.

It is sectional drawing of the diaphragm pump which concerns on this invention. It is a top view of the diaphragm holder in the diaphragm pump which concerns on this invention. FIG. 4A is a plan view of the diaphragm in the diaphragm pump according to the present invention, and FIG. 4B is a cross-sectional view taken along line III (B) -III (B) in FIG. It is sectional drawing which expands and shows the valve body for suction | inhalation in the diaphragm pump which concerns on this invention. The discharge valve body in the diaphragm pump which concerns on this invention is shown, The same figure (A) is a top view, The same figure (B) is the V (B) -V (B) sectional view taken along the same figure, (A) (C) is a bottom view. It is an expanded sectional view showing the state where the discharge valve element in the diaphragm pump concerning the present invention is assembled, and the figure (A) shows the state before assembling and the figure (B) shows the assembled state. It is an expanded sectional view which shows the state which assembled | attaches the valve body for discharge in the conventional diaphragm pump. It is a top view of the partition plate in the diaphragm pump which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In FIG. 1, for convenience of explaining the relationship between the diaphragm portion 17 and the discharge valve body 25, the discharge valve body 25 is positioned at the central portion, and the discharge hole originally positioned at the central portion of the diaphragm pump 1. 31 is shown in a position displaced from the center.

  A three-cylinder negative pressure type diaphragm pump generally indicated by reference numeral 1 in FIG. 1 includes a motor 3 fixed to the outside of a bottom portion of a case 2 formed in a substantially bottomed cylindrical shape. The shaft 3a protrudes from the hole of the case 2 into the case 2, and a crank base 4 is attached to the protruding end portion.

  Reference numeral 5 denotes a drive shaft that is attached to a part of which one end (lower part) is eccentric from the output shaft 3a of the crank base 4 while being inclined with respect to the axial direction of the output shaft 3a, and the other end (upper part). Is inserted into a non-through hole 7 provided at the center of the drive body 6, and the drive body 6 is pivotally supported by the drive shaft 5. In this driving body 6, three driving elements 8 (two driving elements 8 are not shown) are slightly inclined downward at the same angle toward the tip so as to be substantially orthogonal to the non-through hole 7. A diaphragm portion mounting hole 8 a is provided at the tip of each driver element 8.

  Reference numeral 10 denotes a diaphragm holder which is formed in a cup shape with an opening at the bottom, and the upper plate is equiangular with each other in the circumferential direction in a plan view holding a diaphragm portion of a diaphragm which will be described later as shown in FIG. Three holding holes 11 are provided at 120 °. A first communication groove 12 is recessed in the upper plate of the diaphragm ram holder 10 so as to be positioned between the holding holes 11 and extends radially from the center of the diaphragm holder 10 so as to be circumferential with respect to each other. Are formed in a Y shape in plan view by three groove portions 13 having an equal angle (120 °).

  Reference numeral 14 denotes pressing protrusions (see FIG. 6) as three pressing members protruding from the upper plate of the diaphragm 10 and having a rectangular cross section, and the three grooves 13 of the first communication groove 12 are formed. It is positioned in the vicinity of the tip portion 13a. A pressing surface 14a formed on the upper surface of the pressing protrusion 14 is formed flat as shown in FIG. 6A, and is parallel to a lower end surface 34c of a second communication groove 34 described later. It is positioned. Reference numeral 14 b denotes a concave portion in which a projection 27 b of a connecting piece 27 described later is fitted and supports the connecting piece 27. The diaphragm holder 10 is placed on the upper opening end of the case 2.

  Reference numeral 15 denotes a diaphragm formed of a flexible material such as rubber, and a hole 16 is provided at the center as shown in FIG. 3 (A). It is integrally formed by three diaphragm portions 17 having an equal angle (120 °) and a flange 18 formed in a substantially disc shape connecting the upper end portions of the three diaphragm portions 17. A piston 19 is provided at the lower part of each diaphragm part 17 as shown in FIG. 5B, and a projecting part 19b for locking is provided at the lower part of each piston 19 via a narrow neck part 19a. It is integrally formed. The diaphragm 15 is press-fitted into the diaphragm mounting hole 8a of the driver 8 of the driving body 6 while elastically deforming the convex portion 19b of the diaphragm 17 so that the neck 19a is mounted in the diaphragm mounting hole 8a, and the diaphragm 15 is mounted. It is placed on the holder 10.

  As shown in FIGS. 3 and 4, the upper portion of each diaphragm portion 17 is opened, and a portion for opening 17a (a pump chamber 35 to be described later) faces a part of the opening end portion 17b of the opening 17a. The valve body 20 protrudes in the horizontal direction integrally with the diaphragm 15. As shown in FIG. 3A, the suction valve body 20 is formed in a crescent shape (a portion hatched by a broken line for convenience of explanation) in a plan view, and the surface 20a is as shown in FIG. The same surface as the surface of the flange 18 is formed.

  Between the diaphragm portions 17 adjacent to the flange 18 of the diaphragm 15, as shown in FIG. 3, three discharge valve bodies 25 formed in a circular shape in plan view are arranged in a circumferential direction around the hole 16. They are provided at an angle (120 °). Each of the discharge valve bodies 25 is surrounded by a notch 26 having a circular arc shape in plan view, and is connected to the flange 18 via one connecting piece 27 positioned between both ends of the notch 26. In this manner, the diaphragm 15 is integrally formed.

  As shown in FIG. 6, the discharge valve body 25 is provided with a sealing surface 25a formed in a curved shape on the upper surface, and the entire cross section is formed in an arcuate shape curved on the pressing projection 14 side. At the end portion on the side of the piece 27, a pressed protrusion 28 is provided with an inclined surface 28a on which the pressing protrusion 11 of the diaphragm holder 10 abuts. The inclined surface 28a is inclined from the connecting piece 27 toward the tip of the discharge valve body 25 toward the pressing protrusion 14 (lower right in the figure). On the lower surface 27 a of the connecting piece 27, a protrusion 27 b that is fitted into the recess 14 b of the diaphragm holder 10 is provided. When a downward external force in FIG. 1 is applied to the discharge valve body 25, the discharge valve body 25 is elastically deformed downward. Both the suction valve body 20 and the discharge valve body 25 are formed in a flat plate shape thinner than the thickness of the flange 18.

  In FIG. 1, reference numeral 30 denotes a partition plate formed in a substantially disc shape. As shown in FIG. 8, a discharge hole 31 is formed through the center portion, and the discharge hole 31 is formed on the diaphragm 15 described above. The hole 16 communicates with the central portion 12 a of the first communication groove 12. Around the discharge hole 31, there are three suction holes 32 as three suction passages communicating with each pump chamber 35 described later at an equal angle (120 °) in the circumferential direction around the discharge hole 31. It is formed through. As shown in FIG. 4, a bulging portion 33 bulging toward the diaphragm portion 16 is formed at the peripheral portion of the suction hole 32 on the diaphragm portion 17 side (pump chamber 35 side). The cross section is formed in a curved shape so that the amount protruding from the base end side of the suction valve body 20 toward the diaphragm portion 16 side increases toward the diaphragm portion 16 side.

  Reference numeral 34 denotes a second communication groove serving as three discharge passages that are recessed in the lower surface of the partition plate 30, and the discharge holes 31 are centered on the peripheral edge of the partition plate 30 as shown in FIG. 8. They are provided at an equal angle (120 °) in the circumferential direction. As shown in FIG. 1, one end 34 a of each second communication groove 34 is communicated with each pump, and the other end 34 b is communicated with the tip 13 a of each groove 13 of the first communication groove 12. .

  By sandwiching the diaphragm 15 between the partition plate 30 and the diaphragm holder 10, three pump chambers 35 are formed between the partition plate 30 and each diaphragm portion 16, and the suction hole 32 has a suction valve body. When closed by 20, the discharge valve body 25 closes the space between the second communication groove 34 and the first communication groove 12. Further, the projection 27b of the connecting piece 27 of the discharge valve body 25 is fitted into the recess 14b of the diaphragm holder 10, and the discharge valve body 25 is supported by the diaphragm holder 10 in a state in which movement in the left-right direction is restricted. At this time, since the bulging portion 33 is formed at the peripheral edge portion of the suction hole 32 on the diaphragm portion 16 side (pump chamber 35 side), the bulging portion 33 causes the suction valve body 20 to be formed as shown in FIG. It is forced to elastically deform toward the pump chamber 35 side.

  For this reason, the adhesion between the suction valve body 20 and the peripheral edge of the suction hole 32 is improved, and the suction valve body 20 can also be controlled to follow the operation of the diaphragm 15. The sealing performance with respect to the suction hole 32 by the valve body 20 is improved. In addition, the bulging portion 33 is formed in a curved shape so that the amount protruding from the proximal end side of the suction valve body 20 toward the distal end toward the pump chamber 35 is increased. Since the body 20 is gradually elastically deformed without abrupt elastic deformation from the proximal end side toward the distal end, the sealing performance of the suction valve body 20 with respect to the suction hole 32 is not impaired.

  Further, when the diaphragm 15 is sandwiched between the partition plate 30 and the diaphragm holder 10, the pressed projection 28 of the discharge valve body 25 is pressed by the pressing protrusion 14 of the diaphragm holder 10. At this time, the pressed projection 28 is provided at the end of the discharge valve body 25 on the connecting piece 27 side, and the inclined surface 28a is formed at the portion where the pressed projection 14 of the pressed projection 28 contacts. The pressing force F by the pressing protrusion 14 acts exclusively on the discharge valve body 25 side as shown in FIG. 6A, and does not act on the connecting piece 27 side.

  Accordingly, since the component forces F1 and F2 act on the discharge valve body 25, the discharge valve body 25 is elastically deformed into a flat shape, so that the seal surface 25a is second as shown in FIG. It contacts the lower end surface 34a of the communication groove 34. At this time, since the component force F2 is applied to the discharge valve body 25, the sealing surface 25a is pressed against the lower end surface 34a of the second communication groove 34, so that the sealing performance by the discharge valve body 25 is improved. improves. In addition, since the discharge valve body 25 is formed in a bow shape whose cross section is curved toward the pressing projection 14 in advance, the discharge valve body 25 is elastically deformed into a flat shape by the component force F2, thereby sealing the discharge valve body 25. Since the adhesiveness between the entire surface 25a and the lower end surface 34a is improved, the sealing performance by the discharge valve body 25 is further improved. Further, since the pressing force F by the pressing protrusion 14 does not act on the connecting piece 27 side, the connecting piece 27 is not bent or lifted from the lower end surface 34a of the second communication groove 34. Since the state in which the upper surface 27c of the connecting piece 27 is in close contact with the lower end surface 34a is maintained, the sealing performance by the discharge valve body 25 is improved.

  For example, if a pressed projection 28 is provided at the center of the discharge valve body 25 as shown in FIG. 7 and the upper surface 28a of the pressed projection 28 is formed flat, the pressing projection 14 When the pressed protrusion 28 is pressed by the pressure, the pressing force F acts in the left-right direction of the discharge valve body 25. Therefore, since the component force F3 acts on the connecting piece 27, the connecting piece 27 that is restricted from moving in the left-right direction may float so that the upper surface 27c is separated from the lower end surface 34a. There is a possibility that the sealing performance by the body 25 is lowered.

  In FIG. 1, reference numeral 40 denotes a cover body formed in a flat and substantially cylindrical shape, and a discharge cylinder portion in which a discharge port 42 communicating with a discharge hole 31 through a discharge space 41 is formed at the center of the upper surface. 43 is erected. Further, around the discharge cylinder portion 43 of the lid 40, a suction passage 45 communicated with the suction hole 32 through the suction space 44 is equiangular (120 °) in the circumferential direction around the discharge cylinder portion 43. Three are provided. The diaphragm pump 1 is formed by integrating the lid body 40, the partition plate 30, the diaphragm holder 10, and the case 2 with a leaf spring or a through screw (not shown).

  With this configuration, when the motor 3 is driven and the output shaft 3a is rotated, the crank base 4 also rotates integrally, and the drive shaft 5 rotates in an inclined state. Both ends of the two driver elements 8 reciprocate in the vertical direction in the figure. Therefore, since the three diaphragm parts 17 are reciprocated in the vertical direction sequentially, the three pump chambers 35 are also expanded and contracted sequentially. When the pump chamber 35 is expanded, the inside of the pump chamber 35 is in a negative pressure state, and the air is sucked into the pump chamber 35 through the suction passage 44 and the suction hole 32 through the suction passage 45. On the other hand, when the pump chamber 35 contracts, the pressure in the air in the pump chamber 35 increases, so that the air from the discharge port 42 passes through the second communication groove 34, the first communication groove 12, the discharge hole 31, and the discharge space 41. To be released.

  In the present embodiment, a three-cylinder diaphragm pump provided with three pump chambers 35 has been described. However, the present invention can be applied to a diaphragm pump having one cylinder, two cylinders, or four cylinders or more. . In the present embodiment, the lid body 40 is provided. However, if the discharge cylinder portion 43 is provided integrally with the partition plate 30 so that the discharge hole 16 and the discharge port 42 communicate with each other, The lid 40 is not necessarily provided.

  DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 12 ... 1st communicating groove, 14 ... Pressing protrusion (pressing member), 15 ... Diaphragm, 17 ... Diaphragm part, 17a ... Opening, 17b ... Opening end, 18 ... Flange, 20 ... For inhalation Valve body, 25 ... discharge valve body, 27 ... coupling piece, 28 ... pressed projection, 28a ... inclined surface, 32 ... suction hole (suction path), 33 ... bulge, 34 ... second communication groove (discharge) (Path), 35 ... pump chamber, 42 ... discharge port, 45 ... suction passage.

Claims (3)

A pump chamber that is formed by a diaphragm portion of the diaphragm and expands and contracts by reciprocating movement of the diaphragm portion; a suction passage for sucking fluid into the pump chamber; a discharge passage for discharging fluid in the pump chamber; In a diaphragm pump comprising a suction valve body that regulates a backflow of fluid from a pump chamber to the suction passage, and a discharge valve body that regulates a backflow of fluid from the discharge passage to the pump chamber,
The discharge valve body is formed integrally with the diaphragm via one connecting piece,
A pressing member that presses the discharge valve body toward the discharge path;
Provided a pressed projection pressed by the pressing member on the discharge valve body,
The pressed protrusion is positioned at the end of the discharge valve body on the connecting piece side, and the pressing force of the pressing member acts only on the discharge valve body side at the portion of the pressed protrusion pressed by the pressing member. A diaphragm pump characterized in that an inclined surface is provided.   2. The diaphragm pump according to claim 1, wherein the discharge valve body is formed in an arcuate shape whose cross section is curved toward the pressing member. A plurality of the discharge valve bodies are provided at equal angles in the circumferential direction on the diaphragm,
3. The diaphragm pump according to claim 1, wherein a plurality of the suction valve bodies are provided integrally with the diaphragm so as to be positioned between the discharge valve bodies adjacent in the circumferential direction. 4.

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