Waterpump

a water pump and water pump technology, applied in the direction of positive displacement liquid engines, piston pumps, liquid fuel engines, etc., can solve the problems of reducing the pump efficiency compared with supplied electricity, reducing the efficiency of the pump, and reducing the quantity of coolant supplied and the pressur

Inactive Publication Date: 2004-11-25
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In conventional waterpumps, however, when in service, it is inevitable that shear stress of coolant occurs between an outer surface of the non-working section including the magnet section and a plane of the housing confronting the outer surface of the non-working section with coolant interposed.
In other words, friction between the rotor and coolant is prone to restrain the quantity of coolant supplied and the pressure of the coolant in comparison with electricity supplied to the stator.
Especially in rapid rotation area where the rotor rotates at over 3000 rpm, for example, increase of shear stress of the coolant becomes conspicuous, which lowers the pump efficiency compared with supplied electricity.

Method used

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Embodiment Construction

[0023] Preferred embodiments of the present invention are now described below with reference to the accompanying drawings. However, the invention is not limited to the embodiments disclosed herein. All modifications within the appended claims and equivalents relative thereto are intended to be encompassed in the scope of the claims.

[0024] FIGS. 1 to 3 illustrate a first embodiment P1 of the waterpump according to the present invention. The waterpump P1 is a magnetic coupling pump for pumping engine coolant W for vehicles. The pump P1 includes a housing 1 which is made from synthetic resin and has therein a rotor 18 with a plurality of impellers 20 for feeding the coolant W.

[0025] The housing 1 includes a pump chamber 2 in which the impellers 20 of the rotor 18 are located, and a motor chamber 6 located below the pump chamber 2. The pump chamber 2 has a ceiling wall 2a and has a substantially cylindrical shape as a whole. An inlet pipe 3 for introducing the coolant W is projected upw...

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Abstract

An electrically driven waterpump includes a rotor having impellers for feeding fluid. The rotor is housed in a housing. The rotor includes: a working section located in the fluid and contacting the fluid in a main passage of the fluid stirred by the impellers; and a non-working section located in the fluid and apart from the main passage of the fluid. Water repellency is applied to at least either one of an outer surface of the non-working section or a plane of the housing confronting the outer surface of the non-working section with the fluid interposed, so that shear stress of the fluid is reduced, and pump efficiency is improved.

Description

[0001] The present application claims priority from Japanese Patent Application No. 2003-142386 of Hatano et al., filed on May 20, 2003, the entirety of which is hereby incorporated into the present application by reference.[0002] 1. Field of the Invention[0003] The present invention relates to an electric waterpump for pumping fluids such as engine coolant for vehicles.[0004] 2. Description of the Related Art[0005] In conventional electric waterpumps of this kind such as a magnetic coupling pump for engine coolant for vehicles, a rotor having impellers for feeding coolant is located in a housing, as disclosed in Japanese Laid Open Patent Application No. JP10-311290.[0006] In this waterpump, a magnet section is located in a part of the rotor apart from impellers, while a stator is located around the rotor toward the housing to generate a rotating magnetic field for driving the magnet section when electrified.[0007] The rotor is submerged in coolant, and is constituted by two parts: ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01P5/12F04D13/02F04D13/06F04D29/02F04D29/22F04D29/42
CPCF01P2005/125F04D13/0606F04D29/026F04D29/426F05D2300/437F05D2300/507
Inventor HATANO, MAKOTOFUJII, SHINICHI
Owner AISAN IND CO LTD
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