Vane pumps

Patent metadata

Field	Value
Publication number	US-2016090984-A1
Application number	US-201414497678-A
Country	US
Kind code	A1
Filing date	Sep 26, 2014
Priority date	Sep 26, 2014
Publication date	Mar 31, 2016
Grant date	—

Abstract

A rotor for a pump includes a rotor body, an undervane cavity defined in the rotor body configured to accept an underside of a vane, an outer surface on a periphery of the rotor body for defining overvane cavities within a liner as a function of an inner cammed surface of the liner, and a pressure balance aperture defined in the rotor body fluidly connecting the undervane cavity to at least one of the outer surface.

First claim

What is claimed is:

1 . A pump, comprising:
a liner, wherein the liner includes an inner cammed surface; a rotor disposed within the liner and configured to rotate therein, the rotor including an undervane cavity and an outer surface for defining overvane cavities within the liner as a function of the inner cammed surface, wherein the rotor includes a pressure balance aperture defined therein fluidly connecting the undervane cavity to the outer surface; and a plurality of vanes disposed in the rotor and in contact with the cammed surface within the liner, a follower portion of the vanes extending from the rotor radially outwardly and an underside of the vanes extending at least partially into the undervane cavity, wherein the vanes circumferentially define cavities of differing sizes therebetween within the liner in conjunction with the inner cammed surface of the liner and the outer surface of the rotor.

2 . The pump of claim 1 , further including a plurality of pressure balance apertures defined in the rotor in communication with the undervane cavity.

3 . The pump of claim 1 , further including a plurality of vanes and undervane cavities.

4 . The pump of claim 3 , further including a plurality of pressure balance apertures defined in the rotor for each undervane cavity.

5 . The pump of claim 1 , wherein the outer surface includes an axially asymmetric shape.

6 . The pump of claim 1 , wherein the outer surface includes a smooth shape.

7 . A rotor for a pump, comprising:
a rotor body; an undervane cavity defined in the rotor body configured to accept an underside of a vane; an outer surface on a periphery of the rotor body for defining overvane cavities within a liner as a function of an inner cammed surface of the liner; and a pressure balance aperture defined in the rotor body fluidly connecting the undervane cavity to at least one of the outer surface.

8 . The rotor of claim 7 , further including a plurality of pressure balance apertures defined in the rotor in communication with the undervane cavity.

9 . The rotor of claim 7 , further including a plurality of undervane cavities.

10 . The rotor of claim 9 , further including a plurality of pressure balance apertures defined in the rotor for each undervane cavity.

11 . The rotor of claim 7 , wherein the outer surface includes an axially asymmetric shape.

12 . The pump of claim 7 , wherein the outer surface includes a smooth shape.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Cass Michael F
• Ni Weishun W

Classifications

• F04C18/3448

  with axially movable vanes · CPC title

• F04C15/0049 Primary

  Equalization of pressure pulses (silencing for compressors F04C29/06) · CPC title

• F04C2/3448

  with axially movable vanes · CPC title

• F01C21/0863

  the fluid being the working fluid · CPC title

• F04C2/344 Primary

  with vanes reciprocating with respect to the inner member · CPC title