Jet pump having pressure responsive motive fluid control valve
AssigneeThe Garrett Corporation
InventorEdward A. Mock
Life of this patent
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Abstract
A jet pump has an inlet, an outlet, a flow path communicating the inlet with the outlet, and a high pressure motive fluid inlet. The motive fluid inlet communicates with the flow path via a motive fluid control valve disposed within a nozzle assembly. A jet of motive fluid is directed toward the outlet by the nozzle assembly in order to pump fluid from the inlet to the outlet via the flow path. The nozzle assembly includes an actuator operatively connected with the control valve to selectively control flow of motive fluid in accord with a pressure difference between the motive fluid and a selected and possibly variable reference pressure.
Claims8
A fluid pressure responsive variable jet pump comprising a housing defining an inlet, an outlet, and a high pressure inlet;
- a nozzle assembly in association with said high pressure inlet for forming a jet of fluid directed toward said outlet to entrain fluid from said inlet;
- and valve means for comparing fluid pressure at said high pressure inlet with a substantially constant reference fluid pressure and controlling fluid flow through said nozzle assembly in response to said comparison;
- said housing defining a chamber communicating with said inlet, a convergent section of said chamber leading to a throat section, and a divergent diffuser section leading from said throat section to said outlet, said nozzle assembly being disposed to discharge said jet of fluid across at least a portion of said chamber toward said outlet;
- said valve means including a valve member movable to control said fluid flow through said nozzle assembly, means defining a variable-volume resilient chamber operatively coupled with said valve member, and resilient means for biasing said valve member in a first direction;
- said variable-volume chamber defining means including a resilient annular bellows member;
- and
- said chamber defining means including a pair of said resilient annular bellows members arranged coannularly.
Apparatus comprising:
- a housing defining a chamber having an inlet, said chamber including a convergent section leading to a throat portion of said housing, said throat portion leading to a divergent diffuser section which leads to an outlet, said housing further defining a high pressure inlet communicating with said chamber;
- a nozzle assembly communicating with said high pressure inlet, said nozzle assembly entending into said chamber in substantial alignment with said convergent section thereof and defining a nozzle aperture opening between said high pressure inlet and said chamber;
- a streamlined chambered body concentrically supported within said nozzle assembly by a plurality of radially extending struts, said streamlined body cooperating with said nozzle assembly to define an annular fluid flow path communicating said high pressure inlet with said nozzle aperture, said streamlined body defining a bore at the downstream end thereof opening from the interior thereof to said fluid flow path and in substantial alignment with said nozzle aperture;
- a valve member movable within said bore and movable relative to said nozzle aperture to control fluid flow therethrough;
- said streamlined body defining a passage communicating said high pressure inlet with the interior of said body;
- means within said streamlined body for comparing fluid pressure at said high pressure inlet with a substantially constant reference fluid pressure and moving said valve member in response to said comparison;
- said moving means including structure defining a resilient variable-volume chamber operatively coupled with said valve member to move the latter in response to fluid pressure;
- said structure including a resilient annular bellows member substantially defining said variable-volume chamber;
- and
- said structure further including another resilient annular bellows member cooperating with said bellows member to substantially define said variable-volume chamber.
Dependencies are inferred from the claim text.