Electric pump

a technology of electric pump and pump body, which is applied in the direction of pump, positive displacement liquid engine, machine/engine, etc., can solve the problems of condensed water and lowered knocking noise, and achieve the effect of not increasing the size of the pump

Inactive Publication Date: 2011-03-01
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Accordingly, it is an objective of the present invention to provide an electric pump that is capable of detaching a rotor from a pump chamber without increasing the size of the pump.

Problems solved by technology

Such reduction of shock results in a lowered level of knocking noise.
Further, if the fuel-cell system is stopped after being operated in a cool environment below freezing, the condensed water will be frozen, which may adhere the rotor with the inner wall of the pump chamber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013]An electric pump according to one embodiment of the present invention will be described with reference to FIGS. 1 to 3. In this embodiment, the electric pump is embodied as a roots pump used as a hydrogen circulation pump in a fuel-cell system 10. The fuel-cell system 10 has a fuel cell 11, oxygen supplying means 12, and hydrogen supplying means 13 a shown in FIG. 3. The fuel cell 11 is, for example, a polymer electrolyte membrane fuel cell, which causes oxygen supplied from the oxygen supplying means 12, and hydrogen supplied from the hydrogen supplying means 13 to react with each other, thereby generating direct current electric energy (direct current electricity). The oxygen supplying means 12 includes a compressor 14 for compression air. The compressor 14 is connected to an oxygen supply port (not shown) of the fuel cell 11 with a pipe 15. A humidifier 16 is provided on the pipe 15.

[0014]The hydrogen supplying means 13 includes an electric pump, or a roots pump 17 that rec...

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PUM

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Abstract

A rotary shaft is rotatable relative to a motor rotor. A first end face of the motor rotor is exposed to the outside of a stator. A hammer portion is provided at the first end face. The hammer portion is configured to be movable as the motor rotor rotates. A collision portion rotating integrally with the rotary shaft is configured to collide with the hammer portion. The allowance space between the collision portion and the hammer portion allows the hammer portion to be move relative to the collision portion. Therefore, the electric pump is capable of detaching a rotor from a pump chamber without increasing the size of the pump.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to an electric pump in which a rotary shaft rotated by an electric motor is supported in a housing. A rotor, which rotates along with rotation of the rotary shaft, is accommodated in a pump chamber.[0002]For example, Japanese Laid-Open Patent Publication No. 8-242565 discloses a centrifugal pump that rotates a rotor to transfer fluid. The centrifugal pump disclosed in Japanese Laid-Open Patent Publication No. 8-242565 has a permanent magnet synchronous motor to rotate a rotary shaft. As the shaft is rotated, an impeller (rotor) accommodated in a casing is rotated. By means of centrifugal force produced by the rotation of the impeller, fluid (liquid) is transferred. The permanent magnet synchronous motor of the centrifugal pump has a permanent magnet rotor inside of a stator. The permanent magnet rotor is accommodated in a cup-shaped element and has an integrally formed power transmitting tooth. The shaft has a ridge that...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): F04B9/00
InventorFUJII, TOSHIRONAKANE, YOSHIYUKI
OwnerTOYOTA IND CORP