JP2019031921A - Diaphragm pump - Google Patents

Abstract

To provide a diaphragm pump which can prevent inflow of foreign matters into the inside of the pump to perform efficient suction.SOLUTION: A diaphragm pump comprises a pump chamber 2 formed by a diaphragm 1, a suction passage 3 for sucking fluid into the pump chamber 2, a suction valve 5 which is provided in the suction passage 3 and regulates a back flow of the fluid, and a suction space 34 putting the suction passage 3 in communication with the outside. The diaphragm pump comprises a valve holder 17 in which the suction passage 3 and the suction valve 5 are provided, and grooves 51 are provided in the inner surface of the suction space 34 in the valve holder 17. The plurality of grooves 51 are provided continuously in the circumferential direction. Liquid slightly contained in suction gas is absorbed in the grooves 51, so that clogging and deterioration caused by the liquid and substances separated from the liquid can be prevented.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a diaphragm pump for transferring a fluid by a diaphragm.

  Conventionally, in a diaphragm pump that transfers gas by expansion and contraction of a diaphragm, in order to prevent deterioration of the pump performance caused by foreign matter mixed into the fluid and sucked into the pump, the suction passage is configured by a plurality of small diameter passages. A diaphragm pump (for example, Patent Document 1) has been proposed.

JP 2007-9715 A

  In the diaphragm pump of Patent Document 1, the liquid slightly contained in the gas and the substance eluted in the liquid easily pass through the suction passage, so that the passed substance is deposited in the pump chamber, the valve, the exhaust port, and the like. There is a possibility that the performance of the pump may be reduced due to clogging or deterioration of the material.

  In view of the above problems, an object of the present invention is to provide a diaphragm pump that can prevent inflow of foreign matter into the pump and can perform efficient suction.

  In the diaphragm pump according to the first aspect of the present invention, a pump chamber formed by the diaphragm, a suction passage for sucking fluid into the pump chamber, a suction valve provided in the suction passage and restricting the back flow of the fluid, A diaphragm pump comprising a suction space that communicates the suction passage with the outside, comprising a valve holder provided with the suction passage and the suction valve, and a groove is provided on the inner surface of the suction space of the valve holder. It is characterized by.

  The diaphragm pump of the invention of claim 2 is characterized in that a plurality of the grooves are provided.

  The diaphragm pump according to a third aspect of the invention is characterized in that the groove is provided continuously in the circumferential direction.

  In the diaphragm pump according to a fourth aspect of the present invention, the groove is provided intermittently.

  The diaphragm pump according to a fifth aspect of the invention is characterized in that a lid body that forms the suction space is provided, and the groove is provided on the inner surface of the suction space of the lid body.

  According to the first aspect of the present invention, the liquid slightly contained in the inhaled gas is absorbed into the groove, so that it is possible to prevent clogging or deterioration due to the liquid or a substance deposited from the liquid.

  According to the second aspect of the invention, the liquid slightly contained in the inhaled gas can be absorbed by the plurality of grooves, and the amount that can be absorbed increases.

  According to the third aspect of the present invention, since the liquid transmitted through the inner surface where the groove is formed always passes through the portion of the groove, the liquid can be reliably absorbed into the groove.

  According to the fourth aspect of the present invention, the liquid slightly contained in the inhaled gas is absorbed by the grooves provided intermittently, so that it is possible to prevent clogging and deterioration due to the liquid and the substance deposited from the liquid.

  According to the fifth aspect of the present invention, the effect of preventing the liquid from flowing into the pump chamber can be enhanced by providing the grooves on the inner surfaces of the suction spaces of both the valve holder and the lid.

It is sectional drawing of the diaphragm pump in Example 1 of this invention. It is a top sectional view of a valve holder same as the above. It is sectional drawing which shows a suction valve and a holding frame periphery same as the above. It is sectional drawing of the diaphragm pump in Example 2 of this invention. It is a plane sectional view of a cover body same as the above. It is sectional drawing of the diaphragm pump in Example 3 of this invention. It is a plane sectional view of the valve holder in Example 4 of the present invention. It is a plane sectional view of a cover body same as the above. It is sectional drawing of the diaphragm pump in Example 5 of this invention. It is sectional drawing of the diaphragm pump in Example 6 of this invention. It is sectional drawing of a diaphragm same as the above. FIG. 12 is a cross-sectional view taken along line AA in FIG. 11. It is sectional drawing of the diaphragm in Example 7 of this invention. FIG. 14 is a cross-sectional view taken along line AA in FIG. 13. It is sectional drawing of the diaphragm in Example 7 of this invention. FIG. 16 is a cross-sectional view taken along line AA of FIG.

  Hereinafter, preferred embodiments of a diaphragm pump according to the present invention will be described with reference to the accompanying drawings. In the following embodiments, common portions are denoted by common reference numerals, and description of common portions is omitted as much as possible to avoid duplication.

  1 to 3 show Embodiment 1 of the diaphragm pump of the present invention. The diaphragm pump of this embodiment includes a pump chamber 2 that is formed by the diaphragm 1 and expands and contracts, a suction passage 3 for sucking fluid such as air or liquid from the outside into the pump chamber 2, A discharge passage 4 for discharging air or liquid to the outside, a suction valve 5 provided in the suction passage 3 for restricting the backflow of air or liquid from the pump chamber 2 to the suction passage 3, and a pump provided in the discharge passage 4. And a discharge valve 6 for restricting the backflow of fluid to the chamber 2.

  The diaphragm pump includes a case 7, which includes a case main body 7A that is a lower case formed in a substantially bottomed cylindrical shape, and a motor 9 that is a prime mover is attached to a lower portion of the bottom portion 8 of the case main body 7A. A hole 11 is provided in the center of the bottom portion 8, and the output shaft 10 of the motor 9 faces the case body 7A through the hole 11.

  Reference numeral 12 denotes a crank base. The crank base 12 is rotatably mounted on the output shaft 10 of the motor 9, and the drive shaft 13 is located at a position eccentric from the central portion where the output shaft 10 is inserted. It is held in an inclined state with respect to the vertical direction. Reference numeral 14 denotes a driving body, which includes three driving elements 15 provided at equal intervals in the circumferential direction, and the driving shaft 13 is mounted in a shaft hole 14A at the center of the driving body 14. .

  The diaphragm 1 is made of an elastic material having flexibility, and is formed integrally with a diaphragm body 101 as a flange portion formed in a plate shape and extending downward from the lower surface of the diaphragm body 101. Three diaphragm portions 102 provided at equal intervals in the circumferential direction, a substantially cylindrical piston portion 103 projecting downward from the lower end 102A of the diaphragm portion 102, and a small diameter provided at the lower end of the piston portion 103 It has the part 104 integrally. The diaphragm 1 is fixed in a state where the upper surface and the lower surface of the diaphragm main body 101 are sandwiched between the diaphragm holder 16 and the valve holder 17, respectively, and each small diameter portion 104 is fixed to each driver element 15.

  The diaphragm portion 102 is provided between the diaphragm main body 101 and the piston portion 103, the portion of the diaphragm portion 102 and the upper surface portion of the piston portion 103 forms a bell shape, and the flat cross section of the thin plate-like diaphragm portion 102 is: It is formed in a circular shape so that its diameter gradually decreases from the upper side to the lower side. The diaphragm holder 16 and the valve holder 17 constitute a part of the case 7.

  Here, the pump chamber 2 is defined by the upper surface of the diaphragm portion 102 and the piston portion 103 and the lower surface of the bottom portion 33A of the diaphragm holder 16.

  The discharge valve 6 is provided with an upper end 102 </ b> B of the diaphragm portion 102, which is a boundary portion between the diaphragm main body 101 and the diaphragm portion 102, extending in a thin plate shape upward from the upper surface of the diaphragm main body 101.

  The diaphragm holder 16 is formed so as to be able to contact and support the diaphragm main body 101, and includes an upper plate portion 16A having a flat upper surface. The upper plate portion 16A is provided for holding each diaphragm portion 102 in a loosely inserted state. A through portion 16B is formed through. In addition, a shaft portion that is coaxially arranged with the output shaft 10 on the lower center side of the diaphragm holder 16 and that can rotatably support a concave portion 14B provided in a semicircular arc shape at the upper center of the driving body 14 from above. 16C is formed. Further, the diaphragm holder 16 has a side plate portion 16D that forms a part of the outer peripheral surface of the case 7, and the side plate portion 16D and the upper plate portion 16A are provided integrally.

  The valve holder 17 integrally includes a holder upper plate portion 31 and a cylindrical holder side plate portion (side plate portion of the valve holder) 32 provided around the lower portion of the holder upper plate portion 31. A bottomed cylindrical holding frame 33 having an open top is integrally provided on the plate portion 31, and the holding frame 33 is provided at three locations corresponding to the three diaphragm portions 102. The inside of the holding frame 33 is a holder side suction space 34. The holder side plate portion 32 constitutes a part of the outer peripheral surface of the case 7.

  The valve holder 17 has the discharge space 22 below the holder upper plate portion 31, the discharge space 22 communicates with the discharge passage 4, and a through hole 36 that communicates with the discharge space 22 includes the above-described discharge space 22. A hole is formed in the holder upper plate portion 31.

  The outer surfaces of the discharge valve 6 and the holding frame 33 are provided so as to be in surface contact with each other, and the discharge valve 6 is closed when the discharge valve 6 and the outer peripheral surface of the cylindrical portion 37 of the holding frame 33 are in surface contact. The discharge passage 4 is provided between the discharge valve 6 and the holding frame 33. Further, the discharge passage 4 is formed between the outer peripheral side surface of the cylindrical portion 37 and the discharge valve 6 in a state where the discharge valve 6 is separated from the outer peripheral surface of the cylindrical portion 37 of the holding frame 33, and this state is the discharge valve. 6 is an open state.

  A slit-shaped groove 51 is formed on the inner peripheral surface 37N of the cylindrical portion 37 of the holding frame 33. A plurality of the grooves 51 are formed at intervals in the vertical direction, and the groove 51 is deeper than the width. And the interval between the adjacent grooves 51 and 51 is wider than the width of the groove 51. In this example, the groove 51 is continuously provided in an endless manner in the circumferential direction of the inner peripheral surface 37N, and the groove 51 forms a ring shape. The vertical direction is the direction in which the pump chamber 2 expands and contracts. In this example, the central axis of the inner peripheral surface 37N is formed in the vertical direction. The inner peripheral surface 37N of the cylindrical portion 37 is the inner surface of the holder-side suction space 34. In addition, the inner surfaces which oppose the upper and lower sides of the groove | channel 51 are parallel. Moreover, as the width | variety of the groove | channel 51, 3.0 mm or less from the surface of the performance which absorbs a liquid, Preferably it is 1.5 mm or less.

  Reference numeral 18 denotes a lid that covers the upper side of the case 7, and this lid 18 constitutes a part of the case 7, and is a cylindrical shape provided around the lid upper plate portion 41 and the lower portion of the lid upper plate portion 41. The lid side plate portion (side plate portion of the lid body) 42 and a cylindrical portion 43 provided at the center of the lower portion of the lid upper plate portion 41 are integrally provided. Three curved portions 44 (FIG. 5 of Example 2) recessed in a curved shape are provided at equal intervals in the circumferential direction. In addition, the outer peripheral surface of the curved portion 44 has a substantially circular shape. In the lid 18, a lid-side suction space 45 is formed between the inner peripheral surface 42 N of the lid-side plate portion 42 and the outer peripheral surface 43 N of the cylindrical portion 43.

  In addition, a discharge cylinder part 46 communicating with the cylindrical part 43 is projected from the center of the upper surface of the lid upper plate part 41, and the lid body 18 is continuously provided inside the discharge cylinder part 46 and the cylindrical part 43. A discharge port 19 is provided for communication between the inside and the outside.

  Reference numeral 21 denotes a packing that seals the lid 18 and the valve holder 17 in an airtight or liquid-tight manner. By the packing 21, the inside of the lid 18 and the inside of the valve holder 17 are connected in an airtight or liquid-tight manner. A communication hole 21 </ b> A that communicates the inside of the cylindrical portion 43 and the through hole 36 is formed in the center of the packing 21. Further, a communication hole 21B is formed in the center of the packing 21. The communication hole 21B allows the holder side suction space 34 of the valve holder 17 and the cover side suction space 45 of the lid 18 to communicate with each other.

  By assembling the diaphragm holder 16, the valve holder 17, the lid 18 and the packing 21 in this way, the discharge space 22 communicating with the discharge passage 4 and the holder side and lid side suction spaces 34 and 45 communicating with the suction passage 3 are obtained. It is formed.

  A detailed description of the vicinity of the suction valve 5 and the holding frame 33 will be given based on FIG. In the center of the bottom 33A of the holding frame 33, there is integrally provided a suction valve holding hole 33B that is formed so as to penetrate vertically and can hold the holding shaft 24 of the suction valve 5. The suction passage 3 holds the suction valve. It is formed as a penetrating portion that is formed so as to penetrate vertically around the hole 33B and can be closed by a thin plate-like valve body 25 of the suction valve 5 from below the bottom portion 33A.

  Further, the bottom surface of the bottom portion 33A is formed so that the bottom surface of the bottom portion 33A is recessed upward so as to contact the valve body 25 of the suction valve 5, and the valve body 25 is formed inside the holding frame 33 from the bottom surface of the bottom portion 33A. The valve seat surface 26 is provided so that the vicinity of the suction valve holding hole 33B located at the approximate center of the valve seat surface 26 is substantially the highest point from the outer peripheral end of the valve seat surface 26. The suction valve holding hole 33B is formed in a tapered shape that is inclined in a substantially arc surface shape or a substantially curved surface shape from below to above. Further, the valve body 25 and the holding shaft 24 of the intake valve 5 are formed of an elastic material such as rubber.

  Here, in the valve seat surface 26 of the holding frame 33, the periphery of the suction valve holding hole 33 </ b> B is recessed upward in accordance with the level difference of the connection portion 24 </ b> A between the valve body 25 of the suction valve 5 and the holding shaft 24. And a cylindrical convex portion 28 having the suction valve holding hole 33B is formed by projecting upwardly around the suction valve holding hole 33B on the upper surface of the bottom 33A, and the suction valve is formed by the concave portion 27 and the convex portion 28. A step portion 29 around the holding hole 33B is formed. Here, the concave portion 27 is formed by expanding the suction valve holding hole 33B in two steps in a stepwise manner toward the lower surface of the bottom portion 33A, and the upper portion 27A with the inner diameter of the suction valve holding hole 33B facing downward. It is formed by gradually expanding the diameter, and the lower portion 27B is formed by expanding the diameter to be larger than the inner diameter of the suction valve holding hole 33B.

  Next, the operation of the diaphragm pump having the above configuration will be described. When the crank base 12 rotates integrally with the output shaft 10 along with the rotation of the output shaft 10 driven by the motor 9, the drive shaft 13 rotates eccentrically around the output shaft 10 so as to change its inclination direction. Along with the eccentric rotation of the drive shaft 13, the three drive elements 15 of the drive body 14 are alternately swung in the vertical direction so as to be parallel to the axial direction of the output shaft 10, and are fixed to the respective drive elements 15. One diaphragm portion 102 also swings up and down alternately following the swinging motion of each driver element 15. As a result, when the piston portion 103 moves downward together with the small-diameter portion 104 and the volume of the diaphragm portion 102 increases, the pump chamber 2 expands to a reduced pressure lower than the atmospheric pressure, the discharge valve 6 is closed, When the valve body 25 of the suction valve 5 is sucked into the pump chamber 2 and moved downward, the suction passage 3 closed by the valve body 25 is opened, and the fluid is sucked into the suction port in the suction cylinder portion 20. The air is sucked into the pump chamber 2 through the suction spaces 45 and 34 and the suction passage 3 from 20A.

  At this time, even when a slight amount of liquid is mixed in the gas sucked from the suction cylinder portion 20, the liquid is accumulated in the groove 51 provided in the inner surface of the holder-side suction space 34 of the valve holder 17, and enters the pump chamber 2. By preventing the inflow of the liquid, it is possible to prevent the suction valve 5 and the diaphragm 1 from being eroded by the liquid and the substance deposited from the liquid.

  Thereby, it is possible to provide a diaphragm pump capable of long-term operation while maintaining the suction performance.

  Thereafter, when the output shaft 10 of the motor 9 further rotates, the narrow diameter portion 104 of the diaphragm portion 102 of the expanded pump chamber 2 moves upward, and the pump chamber 2 contracts when the volume of the diaphragm portion 102 decreases, When the pressure of the fluid in the pump chamber 2 rises and the valve body 25 of the suction valve 5 is pushed up by the fluid and the valve body 25 moves upward, the suction valve 5 is closed, and conversely, the discharge valve 6 is opened and the pump chamber 2 is opened. This fluid is discharged from the discharge port 19 through the discharge passage 4. In this way, the expansion / contraction operation of the pump chamber 2 is performed alternately and continuously in accordance with the expansion / contraction of the diaphragm portion 102 in each pump chamber 2, and the fluid discharged from each discharge passage 4 joins in the discharge space 22. Then, it is continuously discharged from the discharge port 19.

  As described above, in this embodiment, the pump chamber 2 that is formed by the diaphragm 1 and expands / contracts, the suction passage 3 for sucking air or liquid into the pump chamber 2, and the air or liquid in the pump chamber 2 are used. A discharge passage 4 for discharging, a suction valve 5 provided in the suction passage 3 for regulating the backflow of air or liquid from the pump chamber 2 to the suction passage 3, and air to the pump chamber 2 provided in the discharge passage 4 Alternatively, it includes a discharge valve 6 that restricts the back flow of the liquid, and a discharge passage 19 and a discharge port 19 that communicates with the outside, and the discharge valve 6 protrudes integrally at the tip of each piston portion 103 that is a driver of the diaphragm 1. The diaphragm pump is provided with a valve holder 17 in which the suction passage 3 and the suction valve 5 are provided, and liquid enters the inner peripheral surface 37N which is the inner surface of the holder-side suction space 34 of the valve holder 17. And a writing groove 51 provided.

  As described above, in this embodiment, the pump chamber 2 formed by the diaphragm 1, the suction passage 3 for sucking fluid into the pump chamber 2, and the suction valve 5 provided in the suction passage 3 for regulating the backflow of fluid. In addition, a diaphragm pump having a holder-side suction space 34 that is a suction space that communicates the suction passage 3 with the outside includes a valve holder 17 provided with the suction passage 3 and the suction valve 5. A groove 51 into which a liquid enters is provided in an inner peripheral surface 37N that is an inner surface of the suction space 34.

  In this case, the liquid slightly contained in the inhaled gas is absorbed into the groove 51, so that it is possible to prevent clogging or deterioration due to the liquid or a substance deposited from the liquid. Specifically, the clogging of the substance in the suction passage 3, the discharge port 19, and the passage between the suction passage 3 and the discharge port 19 can be prevented, and the substance adheres to the diaphragm portion 102, the discharge valve 6, and the like. It is possible to prevent deterioration due to

  In the present embodiment, a plurality of grooves 51 are provided.

  In this case, the liquid slightly contained in the inhaled gas can be absorbed by the plurality of grooves 51, and the amount that can be absorbed increases.

  Furthermore, in this embodiment, the grooves 51 are continuously provided in the circumferential direction.

  In this case, since the liquid transmitted through the cylindrical inner peripheral surface 37N always passes through the groove 51, the liquid can be reliably absorbed into the groove 51.

  Further, since the groove 51 is provided in the valve holder 17, the liquid slightly contained in the suction gas is absorbed into the groove 51 before the suction passage 3. Furthermore, the cylindrical portion 37 of the holding frame 33 is provided in the length direction of the suction passage 3, and the groove 51 is provided in the cylindrical portion 37 in a direction substantially intersecting with the flow of fluid, so that liquid is supplied to the groove 51. It becomes easy to collect. Furthermore, since the grooves 51 are respectively provided in the three holder-side suction spaces 34, 34, 34, it is possible to prevent the liquid from flowing into the pump chambers 2, 2, 2.

  4 and 5 show a diaphragm pump according to the second embodiment of the present invention. A feature of this embodiment is the groove 51 provided in the suction space, and the other configuration is also described in the first embodiment, and therefore description of common portions is omitted as much as possible.

  In this example, grooves 51 are provided in the lid 18 and the valve holder 17, respectively. The lid 18 includes an outer peripheral surface 43N of the tubular portion 43 and an inner peripheral surface 42N of the lid-side plate portion 42 as inner surfaces of the lid-side suction space 45, and a ring-shaped groove on the outer peripheral surface 43N. 51, the groove 51 is formed on the inner peripheral surface 42N, and the groove 51 formed on the inner peripheral surface 42N is formed continuously on the entire circumference of the inner peripheral surface 42N including the three curved portions 44. ing. The outer peripheral surface 43N and the inner peripheral surface 42N are the inner surfaces of the lid side suction space 45.

  As described above, in this embodiment, the pump chamber 2 formed by the diaphragm 1, the suction passage 3 for sucking fluid into the pump chamber 2, and the suction valve 5 provided in the suction passage 3 for regulating the backflow of fluid. A diaphragm pump including a holder-side suction space 34 and a lid-side suction space 45 that serve as a suction space that communicates the suction passage 3 with the outside, and includes a valve holder 17 provided with the suction passage 3 and the suction valve 5. A groove 51 is provided on the inner peripheral surface 37N which is the inner surface of the holder-side suction space 34 of the valve holder 17 and includes a lid body 18 which forms the lid-side suction space 45. The inner surface of the lid body 18 which is the inner surface of the lid-side suction space 45 is provided. Grooves 51 are provided in the peripheral surface 42N and the outer peripheral surface 43N.

  In this case, the liquid slightly contained in the inhaled gas is absorbed into the groove 51, so that it is possible to prevent clogging or deterioration due to the liquid or a substance deposited from the liquid.

  In the present embodiment, the lid body 18 that forms the lid body side suction space 45 is provided, and the grooves 51 are provided on the inner peripheral surface 42N and the outer peripheral surface 43N that are the inner surfaces of the lid body side suction space 45 of the lid body 18.

  In this case, by providing the grooves 51 on the inner surfaces of both the holder-side suction space 34 and the lid-side suction space 45, the effect of preventing the liquid from flowing into the pump chamber 2 can be enhanced.

  FIG. 6 shows a diaphragm pump in the third embodiment of the present invention. A feature of this embodiment is the groove 51 provided in the suction space, and the other configuration has been described in each of the above-described embodiments. Therefore, description of common portions is omitted as much as possible.

  In this example, the groove 18 is provided in the lid 18 and the groove is not provided in the valve holder 17.

  As described above, in this embodiment, the lid 18 that forms the lid-side suction space 45 is provided, and the grooves 51 are provided on the inner peripheral surface 42N and the outer peripheral surface 43N that are the inner surfaces of the lid-side suction space 45 of the lid 18. .

  In this case, the lid-side suction space 45 is wider than the holder-side suction space 34, and the inner peripheral surface 42N and the outer peripheral surface 43N that are inner surfaces of the lid-side suction space 45 are more than the inner peripheral surface 37N that is the inner surface of the holder-side suction space 34. Since the surface area is large and the total length of the grooves 51 provided in the lid-side suction space 45 can be increased, the effect of preventing the liquid from flowing into the pump chamber 2 can be enhanced.

  Further, since the lid 18 is detachably attached to the case 7 by means of fixing means (not shown) such as bolts and nuts, the substance accumulated in the groove 51 is relatively easily removed by removing the lid 18. Can be done and maintenance becomes easy.

  7 and 8 show a diaphragm pump in Example 4 of the present invention. A feature of this embodiment is a groove provided in the suction space, and other configurations have been described in the above embodiments, and therefore, description of common portions is omitted as much as possible.

  In this example, a plurality of grooves 51 </ b> A are provided intermittently in the circumferential direction on the inner surfaces of the suction spaces 34 and 45.

  As shown in FIG. 7, in the valve holder 17, four grooves 51 </ b> A are provided at equal intervals in the circumferential direction on the inner peripheral surface 37 </ b> N of the cylindrical portion 37 of the holding frame 33. In this example, the circumferential length of the groove 51A is shorter than the length of the portion where the groove between the adjacent grooves 51A, 51A is not provided, and as a whole, the circumferential length of the four grooves 51A, 51A, 51A, 51A. The total length is less than ½ of the circumferential length of the inner circumferential surface 37N.

  Further, as shown in FIG. 8, in the lid 18, three grooves 51A are provided on the outer peripheral surface 43N at equal intervals in the circumferential direction, and nine grooves 51A are provided on the inner peripheral surface 42N at intervals. Each of the curved portions 44 is provided with one groove 51A. Specifically, one groove 51A is provided on the inner peripheral surface 42N of the curved portion 44, and two grooves 51A are provided on the inner peripheral surface 42N between the adjacent curved portions 44 and 44.

  As described above, in this embodiment, the valve holder 17 provided with the suction passage 3 and the suction valve 5 is provided, and the groove 51A is provided on the inner peripheral surface 37N which is the inner surface of the holder-side suction space 34 of the valve holder 17, and the lid 51 The lid 18 that forms the body-side suction space 45 is provided, and grooves 51A are provided on the inner peripheral surface 42N and the outer peripheral surface 43N that are the inner surfaces of the lid-side suction space 45 of the lid 18.

  In this case, the liquid slightly contained in the inhaled gas is absorbed by the groove 51A, so that it is possible to prevent clogging or deterioration due to the liquid or a substance deposited from the liquid.

  In the present embodiment, the grooves 51A are provided intermittently.

  In this case, since the thickness of the member does not change in the portion without the groove between the grooves 51A and 51A, the strength of the member can be ensured.

  FIG. 9 shows a diaphragm pump according to the fifth embodiment of the present invention. A feature of this embodiment is the groove 51 provided in the suction space, and the other configuration has been described in each of the above-described embodiments. Therefore, description of common portions is omitted as much as possible.

  In this example, a plurality of ring-shaped grooves 51 are provided on the inner surface of the suction port 20 </ b> A inside the cylindrical suction tube portion 20, and the inner surface of the suction port 20 </ b> A is the inner surface of the lid side suction space 45.

  As described above, in this embodiment, the valve holder 17 provided with the suction passage 3 and the suction valve 5 is provided, and the groove 51 is provided on the inner peripheral surface 37N which is the inner surface of the holder-side suction space 34 of the valve holder 17, The lid 18 that forms the body-side suction space 45 is provided, and the grooves 51 are provided on the inner peripheral surface 42N, the outer peripheral surface 43N, and the inner surface of the suction port 20A that are the inner surfaces of the lid-side suction space 45 of the lid 18.

  In this case, the liquid slightly contained in the inhaled gas is absorbed by the groove 51, so that clogging or deterioration due to the liquid or a substance deposited from the liquid can be prevented.

  Further, since there is only one suction cylinder portion 20 and the suction gas 20A always passes through the suction port 20A, the liquid contained in the suction gas can be absorbed by the groove 51 provided on the inner surface of the suction port 20A. it can. The groove 51A may be provided intermittently in the suction port 20A.

  FIGS. 10-12 has shown the diaphragm pump in Example 6 of this invention. The feature of this embodiment is the rib 61, and the other configuration is described in the above embodiments, and therefore, description of common portions is omitted as much as possible. In addition, although the diaphragm pump which does not provide the grooves 51 and 51A is shown in FIG. 10, the grooves 51 and 51A may be provided.

  In a diaphragm pump for transferring fluid by expansion and contraction of a diaphragm, the surface of the diaphragm is prevented, for example, as in the diaphragm pump disclosed in Japanese Patent Application Laid-Open No. 2004-19528, in order to prevent the pump life from being reduced due to damage to the diaphragm that is repeatedly deformed by the pump action. There are those in which fine powder with a small friction coefficient is adhered.

  However, in the above configuration, the fine powder adhered by the expansion and contraction of the diaphragm falls, adversely affects the material of other parts, accumulates on the operating shaft of the motor and causes rotation failure, and reduces the performance of the pump. There is a risk of inviting.

  Therefore, there has been a demand for a structure capable of preventing the diaphragm from being damaged and preventing the pump operating time from decreasing without attaching fine powder to the diaphragm.

  In the present embodiment, a plurality of ribs 61 are provided on the inner wall 2A of the diaphragm portion 102 constituting the pump chamber 2 that expands and contracts. The rib 61 is made of the same material as that of the diaphragm portion 102 and is preferably integrally formed when the diaphragm portion 102 is formed.

  The rib 61 is provided on the inner wall 2A of the pump chamber 2 that is formed by the diaphragm 1 and expands and contracts. The inner wall 2A includes an upper end 102B connected to the diaphragm body 101 of the diaphragm portion 102, and the diaphragm portion 102. A portion between the lower end 102 </ b> A connected to the piston portion 103. The lower end of the rib 61 may be extended on the upper surface of the piston portion 103. Further, the upper end of the rib 61 may be extended upward, but the rib 61 is not provided on the inner wall of the discharge valve 6. Furthermore, the rib 61 may be shortened between the upper end 102B and the lower end 102A.

  A plurality of ribs 61 are provided on the inner wall 2A of the diaphragm portion 102 at equal intervals in the circumferential direction, and are provided in the vertical direction that is the expansion / contraction direction, and radially outward from the center of the pump chamber 2. Is provided.

  The thickness of the rib 61 is substantially constant, and the height of the rib 61 from the inner wall 2A is also substantially constant. The dimension of the thickness of the rib 61 and the dimension of the height of the rib 61 from the inner wall 2 </ b> A are smaller than the thickness dimension of the diaphragm portion 102. Further, the thickness of the rib 61 is thinner than the interval between the adjacent ribs 61, 61.

  Next, the operation of the diaphragm pump having the above configuration will be described. The piston 103 is reciprocated up and down by driving the motor 9, and the diaphragm 102 is reciprocated up and down by the up-and-down movement of the piston 103, so that the pump chamber 2 is expanded and compressed. The discharged fluid is discharged from the discharge port 19.

  When the diaphragm portion 102 reciprocates up and down to expand and compress the pump chamber 2, the rib 61 is provided on the inner wall 2A of the pump chamber 2, so that the inner wall of the pump chamber 2 can be expanded when the diaphragm portion 102 expands and contracts. The force applied to 2A can be dispersed. In addition, since the rib 61 partially increases the film thickness of the diaphragm portion 102, the strength of the diaphragm portion 102 can be maintained. In this case, if the film thickness of the entire diaphragm portion 102 is inadvertently increased, the expansion and contraction of the diaphragm portion 102 during expansion / compression of the pump chamber 2 may not be smoothly performed. By partially increasing the thickness, the expansion / contraction performance of the diaphragm 102 can be ensured.

  Thereby, damage to the diaphragm 1 can be prevented, and a decrease in the operating life of the diaphragm pump can be suppressed.

  As described above, in this embodiment, the pump chamber 2 that is formed by the diaphragm 1 and expands / contracts, the suction passage 3 for sucking air or liquid into the pump chamber 2, and the air or liquid in the pump chamber 2 are used. A discharge passage 4 for discharging, a suction valve 5 provided in the suction passage 3 for regulating the backflow of air or liquid from the pump chamber 2 to the suction passage 3, and air to the pump chamber 2 provided in the discharge passage 4 Or the discharge valve 6 which controls the back flow of a liquid, the discharge passage 4 and the discharge port 19 connected to the exterior are provided, and the rib 61 is provided inside the pump chamber 2 which is formed by the diaphragm 1 and expands and contracts.

  As described above, in the present embodiment, in the diaphragm pump including the pump chamber 2 formed by the diaphragm 1 and the diaphragm portion 102 provided in the diaphragm 1 and expanding and contracting the pump chamber 2, the inner surface of the diaphragm portion 102 is provided. A rib 61 is provided on the inner wall 2A.

  In this case, the rib 61 provided on the inner wall 2A can disperse the force applied to the inner wall 2A of the pump chamber 2 when the diaphragm portion 102 expands and contracts, and the rib 61 increases the thickness of the diaphragm portion 102. Thus, the strength of the diaphragm 102 can be maintained. Thereby, the diaphragm part 102 can be prevented from being damaged, and a reduction in the operating life of the pump can be suppressed.

  Further, since the plurality of ribs 61 are provided on the inner wall 2A which is the inner surface of the diaphragm portion 102, the force applied to the inner wall 2A of the pump chamber 2 can be distributed to the plurality of ribs 61, and the strength of the diaphragm portion 102 can be increased. Can be increased. In this case, it is preferable to provide at least three or more ribs 61 at substantially equal intervals in the circumferential direction.

  Further, as shown in FIG. 12, since the plurality of ribs 61 are provided radially from the center side of the diaphragm portion 102, the force applied to the inner wall 2 </ b> A of the pump chamber 2 is distributed substantially uniformly to the plurality of ribs 61. In addition, the diaphragm portion 102 is uniformly expanded and contracted.

  Further, since the plurality of ribs 61 are provided in the direction in which the pump chamber 2 expands and contracts, the force applied to the inner wall 2A of the pump chamber 2 can be distributed substantially uniformly to the plurality of ribs 61, and the diaphragm portion The expansion / contraction of 102 is also performed uniformly, and the durability against repeated expansion / contraction of the diaphragm 102 can be improved.

  13 and 14 show a diaphragm pump in the seventh embodiment of the present invention. The rib 61 is also a feature of this embodiment, and other configurations are described in the above embodiments, and therefore, description of common portions is omitted as much as possible.

  In this example, the rib 61 is formed in an arc shape from the center of the pump chamber 2 toward the discharge valve 6 side (upper side). It is formed so that the inclination increases to the side.

  That is, the rib 61 is formed so that the inclination increases in the clockwise direction from the lower side to the upper side. In other words, the rib 61 is formed in an arc shape so as to gradually turn in the horizontal direction from the lower side to the upper side. The gap between the adjacent ribs 61 and 61 is formed so as to become narrower from the lower end 102A toward the upper end 102B. The arc-shaped ribs 61 are provided radially outward from the center of the pump chamber 2. In contrast to FIG. 13 and FIG. 14, the rib 61 may be formed so that the inclination increases in the counterclockwise direction from the lower side to the upper side.

  As described above, in the present embodiment, since the plurality of ribs 61 are provided radially from the center side of the diaphragm portion 102, the force applied to the inner wall 2A of the pump chamber 2 is distributed to the plurality of ribs 61 substantially uniformly. In addition, the diaphragm portion 102 is uniformly expanded and contracted.

  Further, since the plurality of ribs 61 are provided in an arc shape, the ribs 61 are densely packed on the upper end 102B side that is the boundary between the diaphragm main body 101 and the diaphragm portion 102, and the force applied to the upper end 102B side can be dispersed.

  FIGS. 15-16 has shown the diaphragm pump in Example 6 of this invention. The rib 61 is also a feature of this embodiment, and other configurations are described in the above embodiments, and therefore, description of common portions is omitted as much as possible.

  In this example, the rib 61 is provided perpendicular to the vertical direction, which is the direction in which the pump chamber 2 expands and contracts. Specifically, each rib 61 has an annular shape, and a plurality of annular ribs 61 are provided on the inner wall 2A of the pump chamber 2 at substantially regular intervals in the vertical direction.

  As described above, in the present embodiment, since the rib 61 is a continuous annular shape, it is possible to disperse the force that expands in the radial direction of the diaphragm portion 102 when the pump chamber 2 expands and contracts.

  In addition, this invention is not limited to the said Example, A various change is possible in the range which does not deviate from the meaning of this invention. For example, a continuous groove in the circumferential direction may be provided on one of the valve holder and the lid, and a groove may be provided intermittently on the other, and a groove adjacent in the vertical direction may be intermittent with a groove continuous in the circumferential direction. It may be a groove. Further, a groove may be provided partially in the circumferential direction of the inner surface of the suction space. For example, the groove is formed in a quarter to ¾ of the circumferential length, and the remaining 3/4 to ¼ is formed in the groove. It can be made a part that does not exist. Also, the ribs of the respective embodiments may be provided in combination. For example, the ribs of the sixth or seventh embodiment are provided on the upper side of the inner wall, and the ribs of the eighth embodiment are provided on the lower side of the inner wall. Can be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Diaphragm 102 Diaphragm part 3 Suction passage 4 Discharge passage 5 Suction valve 6 Discharge valve 17 Valve holder 18 Cover body 34 Holder side suction space 37N Inner peripheral surface (inner surface)
42N Inner peripheral surface (inner surface)
43N Outer peripheral surface (inner surface)
45 Lid-side suction space 51 Groove 51A Groove 61 Rib

Claims (5)

  A pump chamber formed by a diaphragm; a suction passage for sucking fluid into the pump chamber; a suction valve provided in the suction passage for restricting the backflow of the fluid; and a suction passage communicating the suction passage with the outside A diaphragm pump comprising a space, comprising: a valve holder provided with the suction passage and the suction valve; and a groove provided in an inner surface of the suction space of the valve holder.   The diaphragm pump according to claim 1, wherein a plurality of the grooves are provided.   The diaphragm pump according to claim 1, wherein the groove is provided continuously in the circumferential direction.   The diaphragm pump according to claim 1 or 2, wherein the groove is provided intermittently. The diaphragm pump according to any one of claims 1 to 4, further comprising a lid that forms the suction space, wherein the groove is provided on an inner surface of the suction space of the lid.

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