Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1976-10-29
1978-07-11
Croyle, Carlton R.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
251250, 251282, 417310, F04B 4908
Patent
active
040998932
ABSTRACT:
A pump unit comprises a housing defining a pumping chamber, a fluid inlet and a fluid outlet communicate with the pumping chamber. A pair of cooperating gear members are located in the pumping chamber to pump fluid from the inlet to the outlet. A pintle member and a valve seat are located in the outlet and an electric motor is provided for moving the pintle member relative to the valve seat. The pintle member and valve seat comprise a variable orifice. The pump unit also includes a bypass valve for bypassing fluid from the outlet to the inlet to thereby control flow of fluid to the system. The amount of fluid which is bypassed is controlled by a spool valve member which is movable in response to forces acting thereon. The spool valve member is acted upon by the pressure drop across the variable orifice. Thus, by adjusting the size of the orifice, the position of the spool valve can be controlled and as a result the amount of flow to the system can be controlled. The spool valve member has one end face which is acted upon by the pressure on one side of the orifice and there are flow passages in the housing communicating the pressure on the other side of the orifice to a pilot pressure chamber located at the other end of the spool valve. A pilot valve is carried by the spool valve and that pilot valve opens in response to a pressure increase in the pilot pressure chamber exceeding a predetermined value. When the pilot valve opens, pressure in the pilot pressure chamber is vented to inlet. A means in the form of a small passage leading to the pilot pressure chamber restricts the rate of buildup of fluid in the chamber during relief of pressure in the chamber opening the pilot valve. As a result the valve spool moves from a flow control position to a pressure relief position in order to bypass more fluid from the outlet of the pump to the inlet of the pump.
REFERENCES:
patent: 2730130 (1956-01-01), Guidry
patent: 3095903 (1963-07-01), Jennings
patent: 3182596 (1965-05-01), Prijatel
patent: 3495539 (1970-02-01), Tomita et al.
Croyle Carlton R.
Gluck R. E.
TRW Inc.
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