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Fluid pump

a technology of fluid pump and pump body, which is applied in the direction of pump components, pump control, positive displacement liquid engine, etc., can solve the problems of drive system operation failure and/or corrosion

Inactive Publication Date: 2014-04-24
AISIN SEIKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is related to a fluid pump that can prevent dust and moisture from entering the piston chamber during operation. The pump has a configuration that allows for the fluid to be fed and discharged from the chamber, reducing the load on the motor. This arrangement also reduces noise caused by variations in air pressure. By filtering the air that is sucked into the chamber, the pump is able to remove dust and moisture, improving its performance and reducing the amount of air needed to be sucked from the outside. The fluid filter can be easily placed in a space that allows for restricted movement. Overall, this invention provides a more efficient and reliable fluid pump.

Problems solved by technology

However, in a fluid pump configured to feed / discharge fluid in association with piston movements, when fluid is sucked to the drive chamber which has reached a negative pressure state, if dust and / or moisture is / are contained in this fluid, this will invite operation failure of the drive system, and / or corrosion thereof.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

Operation Mode of First Embodiment

[0067]With the above-described configuration, when the piston 2 is operated in the sucking direction, the piston ring 30 is displaced to the position in contact (gapless contact) with the first lateral wall 2Ga, thus blocking the flow of air from the pressure increasing / decreasing chamber A toward the drive chamber B. In response to this operation of the piston 2, the intake valve 22 is opened to suck the air from the tube 25 into the pressure increasing / decreasing chamber A to provide a negative pressure, whereby the air of the drive chamber B is fed via the ventilation opening 7A into the ventilation path F and discharged via the opening 15H to the outside of the pump.

[0068]Further, when the piston 2 is operated in the discharging direction, the discharge valve 23 is opened to send the air from the pressure increasing / decreasing chamber A to the fluid path E. Simultaneously with this, the piston ring 30 is displaced to the position in contact with...

second embodiment

Operation Mode of Second Embodiment

[0086]With the above-described configuration, when the piston 2 is operated in the sucking direction, the intake valve 22 is opened, whereby air of the external space is sucked through the opening 15H and filtered through the air filter 17 and then fed via the fluid path E (intake path) into the pressure increasing / decreasing chamber A. When this suction operation is effected, there occurs increase in the pressure of the drive chamber B. So that, the air of the drive chamber B is sent out to the ventilation path F and a portion of this air is merged in the merging space G (the filter space and the silencer space) and fed to the fluid path E. That is, when the piston 2 is operated in the sucking direction, ambient air and the air fed from the drive chamber B are merged in the merging space G and fed to the pressure increasing / decreasing chamber A.

[0087]Further, when the piston 2 is operated in the discharging direction (compressing direction), the d...

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PUM

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Abstract

The present invention inhibits suction of dust and moisture into a drive chamber for driving a piston of a fluid pump while reducing drive load through feeding / discharging of fluid to / from the drive chamber. In the interior of a cylinder, a pressure increasing / decreasing chamber is formed between a valve unit on the cylinder head side and the piston. On the opposite side of the pressure increasing / decreasing chamber, the drive chamber is disposed. There are provided a ventilation path for communicating the drive chamber and the outside space, a fluid path connected to the feeding / discharging space of the valve unit, a merging space where the fluid path is merged with the ventilation path midway, and a fluid filter provided in the merging space.

Description

TECHNICAL FIELD[0001]The present invention relates to a fluid pump configured to effect feeding / discharging of a fluid through movements of a piston. More particularly, the invention relates to a technique for controlling feeding / discharging of a fluid to / from a drive chamber in which there are disposed a connection rod connected to the piston, a crank mechanism, etc.BACKGROUND ART[0002]As an example of a fluid pump, PTL 1 discloses a vacuum pump including a piston mounted inside a cylinder to move back and forth therein, a driving means configured to convert a drive force of a motor into a reciprocal movement via a crank mechanism and transmit this reciprocal movement to the piston, and a valve body having an intake valve and a discharge valve and mounted in the cylinder head.[0003]In this PTL 1, at a position near a drive chamber (a crank chamber in this document) accommodating a crank mechanism, there is disposed a case; and in the cylinder wall, there is formed a discharge gas p...

Claims

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Application Information

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IPC IPC(8): F04B49/22F04B53/20
CPCF04B53/20F04B49/22F04B39/121F04B39/123F04B39/16F04B37/14F04B39/128
Inventor TAKEMI, YUKIHIKO
Owner AISIN SEIKI KK