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Electric pump

a technology of electric pump and pump body, which is applied in the direction of piston pump, positive displacement liquid engine, non-positive displacement fluid engine, etc., can solve the problems of suppressing the reduction in pump efficiency, and achieve the effect of reducing pump efficiency, preventing fluid pressure rising, and reducing pump efficiency

Inactive Publication Date: 2013-06-20
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about an electric pump that prevents a reduction in pump efficiency caused by the contact between the impeller and the casing when the impeller comes into contact with the casing. The invention includes a low rigidity part that allows the shaft to deform and thus move the impeller in a way that prevents contact between the impeller and the casing at specific positions. This results in a higher pump efficiency and reduced reduction in pump efficiency. As a result, the invention provides an improved performance of the electric pump.

Problems solved by technology

Therefore, the reduction in the pump efficiency may be suppressed.

Method used

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  • Electric pump
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Experimental program
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Effect test

first embodiment

[0025]An electric pump 10 according to the present embodiment is installed in an engine room of a vehicle, and used in order to circulate cooling water cooling an engine, an inverter, or the like. As shown in FIG. 1, the electric pump 10 comps a pump portion 20 and a motor portion 40. Outer walls of the electric pump 10 are configured by a casing 12.

[0026]The pump portion 20 is formed in an upper casing 14 of the easing 12. The pump portion 20 has a pump chamber 26 formed by the upper casing 14. A suction opening 22 and a discharge opening (not shown) formed by the casing 12 are connected to the pump chamber 26. The suction opening 22 is connected to an upper edge of a pump chamber 26. The discharge opening extends in a tangential direction of an outer circumference of the pump chamber 26. In the pump chamber 26, an impeller 28 of a rotating body 30 is disposed. The impeller 28 has a circular shape in its top view, and has an upper surface inclined upward from outer circumference to...

second embodiment

[0037]Description of difference from the first embodiment will be made. As shown in FIG. 4, in an electric pump 100 according to a second embodiment, a shape of a shaft 144 is different from that of the shaft 44. While the shaft 144 is not formed with void 44a, the shaft 144 is formed with a small diameter portion 144a. The small diameter portion 144a is disposed on a lower edge side of a through hole 30a above a supporting portion 52. The small diameter portion 144a is a column having a diameter smaller than that of other portion of the shaft 144.

[0038]As shown in FIG. 5, a center X2 of the small diameter portion 144a is located in an area S2 (i.e., area on a position 24a side). The center X2 is offset so as to come close leftward with respect to a center point 144c of the shaft 144 (i.e., a side where a width of a vortex chamber 24 is narrow). In addition, in a second modification, the center X2 may be on a line L2. However, the center X2 and the center point 144c may not coincide...

third embodiment

[0040]Description of difference from the second embodiment will be made. As shown in FIG. 6, in an electric pump 200 according to a third embodiment, a shape of a shaft 244 is different from that of the shaft 144. The shaft 244 is formed with a small diameter portion 244a similar to the small diameter portion 144a. An elastic member 244b is disposed around the small diameter portion 244a. The elastic member 244b is formed by a material having a smaller elastic coefficient than the shaft 244, such as elastically deformable rubber or aluminum. A part configured by the small diameter portion 244a and the elastic member 244h has lower rigidity than other part of the shaft 244 (hereinafter, referred to as a “low rigidity part 244c”). The electric pump 200 can produces an effect similar to the electric pump 100.

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Abstract

In an electric pump, a vortex chamber may be formed by a clearance between an outer circumferential surface of an impeller and an inner circumferential surface of a casing. A low rigidity part may be provided to a supporting portion or a shaft, or to both of them. The low rigidity part may be formed such that while the electric pump operates, a center point of the shaft in a top view of the shaft moves along a specific line which is parallel to a tangent line of the outer circumferential surface of the impeller at the specific position and passes through the center point of the shaft while the electric pump does not operate, or moves to one of two areas divided by the specific line. The one of the two areas may he opposite to the other of the two areas that includes the specific position.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Japanese Patent Application No. 2011-276072, filed on Dec. 16, 2011, the contents of which are hereby incorporated by reference into the present application.TECHNICAL FIELD[0002]The present application relates to an electric pump.DESCRIPTION OF RELATED ART[0003]Japanese Patent Application Publication No. H8-261194 discloses a pump including a shaft, an impeller, and a pulley. The impeller is fixed on an end of the shaft. The pulley is fixed on the other end of the shaft. The shaft is rotatably supported by a bearing. The shaft is provided with a low rigidity flexible portion, which has a smaller cross-sectional area than other portion of the shaft, between the pulley and the hearing. In this pump, the pulley is rotated by applying tension to a belt wound around the pulley. When the pulley rotates, the shaft rotates relative to the bearing. Consequently, the impeller rotates.[0004]When tension is applied...

Claims

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Application Information

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IPC IPC(8): F04D13/06
CPCF04D13/0633F04D13/06
Inventor NAKAMURA, TAKAHIRO
Owner AISAN IND CO LTD