JP4758153B2 - Diaphragm pump - Google Patents

Description

  The present invention relates to a diaphragm pump including a pump chamber that is formed by a diaphragm and expands and contracts.

  3 is a longitudinal sectional view of a conventional diaphragm pump, FIG. 4 (A) is a plan view of the main part, and FIG. 3 (B) is a sectional view taken along line IV (B) -IV (B) in FIG. is there. 3 includes a case 2 formed in a substantially bottomed rectangular tube shape. A motor 4 is attached to the bottom 3 of the case 2, and an output shaft 5 of the motor 4 is provided. Faces through the hole 6 provided in the bottom 3 into the case 2.

  Reference numeral 7 denotes a crank base formed in the shape of a small cylinder, which is pivotally attached to the output shaft 5 of the motor 4, and the drive shaft 8 is vertically positioned at a position eccentric from the center where the output shaft 5 is attached. It is fixed in an inclined state with respect to the direction. Reference numeral 9 denotes a driving body, which is composed of a boss 10 and a pair of driving elements 11 integrally projecting from one end of the boss 10 in opposite directions. A drive shaft 8 is rotatably inserted. A piston portion 17 of each diaphragm portion 16 to be described later is attached to each tip portion of the pair of driver elements 11.

  Reference numeral 12 denotes a diaphragm holder that is open at the bottom and is formed in a substantially box shape. The upper surface plate 13 is provided with two diaphragm part holding holes 14 for holding the diaphragm parts 16, and the diaphragm holder 12. The case 2 and the case 2 are in contact with each other at their open ends. Reference numeral 15 denotes a diaphragm having two diaphragm portions 16, and a piston portion 17 is formed integrally with each diaphragm portion 16.

  A valve holder 18 is formed in a substantially flat plate shape. A partition wall 19 is integrally provided. A discharge passage 20 is provided on the inner side of the partition wall 19 as a boundary, and a suction passage is provided on the outer side. 21 are provided. In FIG. 3, the drawing is drawn so that one suction passage 21 is provided for one suction valve body 24 because of the development of the drawing. Thus, the two suction passages 21 and 21 are provided with the center of one suction valve body 24 being point-symmetric.

  The valve holder 18 sandwiches the diaphragm 15 together with the diaphragm holder 12, and two pump chambers 22 are formed by the valve holder 18 and each diaphragm portion 16. Reference numeral 23 denotes a discharge valve body that restricts air from flowing backward from the discharge passage 20 to the pump chamber 22 by opening and closing and closing the discharge passage 20. Reference numeral 24 denotes a suction valve body that restricts the backflow of air from the pump chamber 22 to the suction passage 21 by opening, closing, and closing the suction passage 21.

  Reference numeral 25 denotes a lid that is formed in a substantially box shape with an opening at the bottom that covers the valve holder 18. Between the lid 25 and the valve holder 18, a discharge passage 20 is formed on the inside with a partition wall 19 as a boundary. A discharge space 26 that communicates is formed, and a suction space 27 that communicates with the suction passage 21 is formed outside. In addition, a cylindrical portion 28 is integrally projected at the center of the top plate of the lid 25, and a discharge port 29 communicating with the discharge space 26 is provided at the open end of the cylindrical portion 28. A cylindrical portion 30 is integrally projected on one end side of the upper surface plate, and a suction port 31 communicating with the suction space 27 is provided at the open end of the cylindrical portion 30. The lid body 25 is welded to the valve holder 18, and the valve holder 18, the diaphragm holder 12, and the case 2 are integrated by a through screw (not shown).

  In such a configuration, when the motor 4 is driven to rotate the output shaft 5 and the crank base 7 is rotated integrally, the drive shaft 8 rotates eccentrically around the output shaft 5 so as to change the inclination direction. The two driving elements 11 and 11 of the driving body 9 alternately swing up and down, and the two diaphragm portions 16 and 16 of the diaphragm 15 also swing up and down alternately. When one diaphragm portion 16 moves downward, the pump chamber 22 expands, so that the pump chamber 22 enters a negative pressure state, and air is sucked into the pump chamber 22 from the suction port 31 through the suction passage 21. The

  When the output shaft 5 of the motor 4 further rotates, the diaphragm portion 16 of the expanded pump chamber 22 moves upward and the pump chamber 22 contracts, so that the air pressure in the pump chamber 22 rises, and the pump chamber 22 Air is discharged from the discharge port 29 through the discharge passage 20. Since the expansion / contraction operation of the pump chamber 22 is alternately and continuously performed in each pump chamber 22, the air discharged from each discharge passage 20 is collected by the discharge space 26 and continuously from one discharge port 29. Discharged.

  In the conventional diaphragm pump described above, if dust such as dust is mixed in the air sucked into the pump through the suction port 31, the dust such as dust enters the pump chamber 22, and the dust that has entered Since the airtightness between the suction valve body 24 and the opening end edge of the suction passage 21 or between the discharge valve body 23 and the opening end edge of the discharge passage 20 is impaired, the pump Will degrade the performance. In order to solve this problem, the suction port 31 of the cylindrical portion 30 is covered with a filter 35 so that dust or the like does not enter the suction space 27 from the suction port 31. However, in this conventional diaphragm pump, since the filter 35 has to be prepared, there is a problem that the cost increases. Further, as shown in FIG. 2, in the diaphragm pump having a structure in which a lid body 25 is welded to the valve holder 18 and a discharge space 26 and a suction space 27 are provided to mute the sound, a suction port of the cylindrical portion 30 is provided by a filter 35. Even if the cover 31 is covered, the welding debris generated at the welded portion A passes through the suction passage 21, between the opening edge of the suction passage 21 and the suction valve body 24, and between the discharge valve body 23 and the discharge passage 20. Since it adheres between the opening edges, the same problem as the above-mentioned problem that the pump performance deteriorates occurs.

  The present invention has been made in view of the above-described conventional problems, and the object of the present invention is to reduce the performance of the pump due to the dust that is mixed into the fluid and sucked into the pump or generated by welding. There is a place to prevent.

In order to achieve this object, the invention according to claim 1 is directed to a pump chamber formed by a diaphragm that expands and contracts, a suction passage for sucking fluid into the pump chamber, and discharges the fluid in the pump chamber. A discharge passage for controlling the backflow of fluid from the pump chamber to the suction passage, and a backflow of fluid to the pump chamber through the discharge passage. In a pump provided with a discharge valve to be regulated, a plurality of the suction passages are provided, and each of the plurality of suction passages is constituted by a large number of small diameter passages.

According to a second aspect of the present invention, there is provided a pump chamber that is formed by a diaphragm and expands and contracts, a suction passage for sucking fluid into the pump chamber, a discharge passage for discharging fluid in the pump chamber, A suction valve that is provided in the suction passage and restricts the backflow of fluid from the pump chamber to the suction passage; and a discharge valve that is provided in the discharge passage and restricts the backflow of fluid to the pump chamber through the discharge passage. In the pump provided, a plurality of the discharge passages are provided, and each of the plurality of discharge passages is constituted by a plurality of small-diameter passages.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein a valve holder provided with the suction passage and the discharge passage, a discharge space that covers the valve holder and communicates with the discharge passage, and the suction passage. And a lid that forms a suction space that communicates with the passage. The lid is provided with a discharge port that communicates with the discharge space and a suction port that communicates with the suction space.

  According to the first or second aspect of the invention, since many small-diameter passages restrict the passage of dust or the like that has entered from the suction port, the airtightness between the valve body and the opening edge of the suction passage or the discharge passage. Therefore, it is possible to prevent the performance of the pump from being deteriorated. Moreover, since it is not necessary to provide a filter specially, the number of parts is reduced, so that the manufacturing cost can be reduced. Moreover, since it is not necessary to attach a filter to a diaphragm pump, the dimension of the height direction of the whole diaphragm pump can be reduced.

  According to the third aspect of the present invention, even if welding residue occurs when welding the valve holder and the lid, the passage of the welding residue can be prevented by the small-diameter passage. Since the airtightness between the open end edge is not impaired, it is possible to prevent the performance of the pump from being deteriorated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is an enlarged plan view showing a main part of a diaphragm pump according to the present invention, and FIG. 1B is a cross-sectional view taken along line I (B) -I (B) in FIG. In the embodiment of the present invention, only the configuration different from the conventional technology described above is shown in FIG. 1, and the same or equivalent configuration as the above-described conventional technology described in FIG. 3 is omitted. .

  As shown in FIG. 1, the present invention is characterized in that the suction passage 21 is constituted by a large number of small-diameter passages 21a, and the passage 21a is provided as many as possible within a limited range (arrangement of the passages 21a). The distance between the adjacent passages 21a and 21a is made as small as possible and the same. In the present embodiment, the passages 21a are arranged in a substantially matrix shape in plan view, but may be arranged in a concentric or zigzag manner, and various design changes are possible. With this configuration, even if dust or the like is mixed in the air sucked into the suction space 27 from the suction port 31, the suction passage 21 is configured by a large number of small diameter passages 21a. Therefore, the passage of dust or the like in the passage 21a is restricted.

  Therefore, since it is possible to control the entry of dust into the pump chamber 22, it is possible to prevent the dust from adhering to the contact portion B where the peripheral edge of the suction valve body 24 and the lower end surface of the valve holder 18 are in contact with each other. can do. For this reason, since airtightness at the contact portion B by the suction valve body 24 is maintained, the function of the suction valve body 24 that restricts the backflow of air from the pump chamber 22 to the suction passage 21 does not deteriorate. Therefore, the pumping action of the diaphragm pump 1 is not reduced.

  As described above, since the suction passage 21 is constituted by a large number of small-diameter passages 21a, these passages 21a function as filters for restricting the passage of dust and the like, so that it is not necessary to specially provide the filter 35 as in the prior art. Therefore, since the number of parts is reduced, the manufacturing cost can be reduced. Moreover, since it is not necessary to attach the filter 35 to the diaphragm pump 1, the dimension of the whole diaphragm pump 1 can be reduced.

  In addition, by providing the suction passage 21 with a large number of small-diameter passages 21a that function as filters, conventionally, the filter 35 attached to the suction port 31 cannot restrict entry into the pump chamber 22. It is possible to regulate the penetration of welding dust generated by the welding of the lid 25 and the lid body 25 into the pump chamber 22.

  FIG. 2 is a cross-sectional view of a main part in the second embodiment of the present invention. The second embodiment is characterized in that the discharge passage 20 is constituted by a large number of small diameter passages 20a. With this configuration, even if dust or the like is mixed in the air sucked into the suction space 27 from the suction port 31, the discharge passage 20 is configured by a large number of small diameter passages 20a. Therefore, the passage of dust or the like in the passage 20a is restricted.

  Therefore, since it is possible to restrict the intrusion of dust into the discharge space 26, the adhesion of dust etc. to the contact portion C where the lower end surface of the discharge valve body 23 and the upper end surface of the valve holder 18 are in contact with each other is prevented. Can be prevented. For this reason, since airtightness in the contact portion C by the discharge valve body 23 is maintained, the function of the discharge valve body 23 that restricts the backflow of air from the discharge space 26 to the pump chamber 22 does not deteriorate. Therefore, the pumping action of the diaphragm pump 1 is not reduced.

  In this embodiment, the fluid is air, but it may be liquid such as water. Further, the example in which the two suction passages 21 are provided has been described. However, when the diameter of the passage 21a is reduced in order to prevent the passage of finer dust, the flow passage resistance due to the passage 21a increases, and thus the suction passage 21 is increased. When the amount of fluid passing through the air passage decreases, three or more suction passages 21 may be provided to compensate for this. In the present embodiment, the small-diameter passages 21a and 20a are provided independently in the suction passage 21 or the discharge passage 20. However, if necessary, they are provided in both the suction passage 21 and the discharge passage 20. Also good.

FIG. 1A is an enlarged plan view showing the main part of the diaphragm pump according to the present invention, and FIG. 1B is a cross-sectional view taken along line I (B) -I (B) in FIG. It is sectional drawing of the principal part in the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the conventional diaphragm pump. FIG. 4A is a plan view showing a main part of a conventional diaphragm pump, and FIG. 4B is a cross-sectional view taken along line IV (B) -IV (B) in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 4 ... Motor, 15 ... Diaphragm, 16 ... Diaphragm part, 18 ... Valve holder, 20 ... Discharge passage, 21 ... Suction passage, 20a, 21a ... Small diameter passage, 22 ... Pump chamber, 23 ... For discharge Valve body 24... Suction valve body 25. Cover body 26. Suction space 27 27 Discharge space 29 Discharge port 31 Suction port

Claims (3)

A pump chamber formed by a diaphragm that expands and contracts; a suction passage for sucking fluid into the pump chamber; a discharge passage for discharging fluid in the pump chamber; and a pump passage provided in the suction passage from the pump chamber In a pump comprising a suction valve that regulates the backflow of fluid to the suction passage, and a discharge valve that is provided in the discharge passage and regulates the backflow of fluid to the pump chamber through the discharge passage.
A diaphragm pump characterized in that a plurality of the suction passages are provided, and each of the plurality of suction passages is constituted by a plurality of small diameter passages. A pump chamber formed by a diaphragm that expands and contracts; a suction passage for sucking fluid into the pump chamber; a discharge passage for discharging fluid in the pump chamber; and a pump passage provided in the suction passage from the pump chamber In a pump comprising a suction valve that regulates the backflow of fluid to the suction passage, and a discharge valve that is provided in the discharge passage and regulates the backflow of fluid to the pump chamber through the discharge passage.
A diaphragm pump characterized in that a plurality of the discharge passages are provided and each of the plurality of discharge passages is constituted by a plurality of small-diameter passages. The diaphragm pump according to claim 1 or 2,
A valve holder provided with the suction passage and the discharge passage;
Covering the valve holder, a discharge space communicating with the discharge passage and a lid forming a suction space communicating with the suction passage,
A diaphragm pump, wherein the lid body is provided with a discharge port communicating with the discharge space and a suction port communicating with the suction space.

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