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Variable displacement pump having rotating cam ring

A cam ring and cam technology, applied in the direction of rotary piston pumps, rotary piston/oscillating piston pump components, rotary piston machinery, etc., can solve problems such as difficult operation of high-speed pumps

Inactive Publication Date: 2004-09-22
ARGO TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even with the full use of tungsten carbide in vane pumps, high speed pumps over 12,000 rpm are still very difficult to operate

Method used

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  • Variable displacement pump having rotating cam ring
  • Variable displacement pump having rotating cam ring
  • Variable displacement pump having rotating cam ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] As shown, the pump assembly 10 includes a housing 12 defining a pump chamber 14 therein. A rotor 20 is rotatably accommodated in the cavity, and the rotor is fixed on a shaft 22 so that the rotor rotates in the cavity. Spaced around the rotor periphery or periphery is a series of radially extending slots 24 which movably receive fins or blades 26 the radially outer edges of which extend from the rotor periphery. The number of blades can be changed, for example, in figure 2 Nine blades are shown in the embodiment, however, a different number of blades may be used without departing from the scope and purpose of the invention. best as figure 2 As shown, the axis of rotation of shaft 22 and rotor 20 is designated by numeral 30 . As the rotor rotates in the casing cavity, the selected vanes ( figure 2 The right leaf shown in ) is not as good as the rest of the leaves ( figure 2 The left vane in ) extends outward from the rotor periphery to an equally large extent. ...

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PUM

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Abstract

Vane pump (10) mechanical losses are reduced by removing vane friction losses and replacing them with lower magnitude journal bearing fluid film viscous drag losses. A freely rotating cam ring (70) is supported by a journal bearing (80). A relatively low sliding velocity is imposed between the cam ring and the vanes (26). This permits the use of less expensive and less brittle materials in the pump by allowing the pump to operate at much higher speeds without concern for exceeding vane tip velocity limits.

Description

technical field [0001] The present invention relates to a pump, in particular a high speed vane pump which finds particular use in regulation and control in jet engine fuel pumps. Background technique [0002] Typically vane pumps use one or more stationary, or non-rotating, cam rings. The radially outer edges of the vanes slide along the cam ring. But the cam ring cannot rotate freely relative to the housing. Fixed cam rings are rigidly mounted to the pump casing of a fixed displacement pump, or the cam rings move or pivot to provide variable displacement performance. Thus, as is known to those skilled in the art, these types of positive displacement pumps include a stator or housing having an inlet and an outlet, usually positioned diametrically offset from the axis of rotation of a rotor contained in a pump chamber. A plurality of circumferentially spaced and radially extending deflectors or vanes extend outwardly from the rotor. Since the rotor axis is offset and par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01C21/08F04C2/344F04C14/22F04C15/00
CPCF04C2220/24F05C2203/0826F01C21/0809F04C2/3442F04C14/226F04C2/344
Inventor 马丁·A·克莱门茨洛厄尔·D·汉森
Owner ARGO TECH CORP