[특허]Balanced, pressure-flow-compensated, single-stage servovalve

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Balanced, pressure-flow-compensated, single-stage servovalve

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F15B-013/044
미국특허분류(USC)	137/62565 ; 137/6252 ; 137/62527 ; 137/62544
출원번호	US-0560211 (1990-07-19)
발명자 / 주소	Magee Garth L. (4448 El Segundo Blvd. #234 Hawthorne CA 90250)
인용정보	피인용 횟수 : 17 인용 특허 : 0

초록
▼

A hydraulic servovalve is controlled electrically through electromagnetic means. Electrical currents applied to force motors determine the relative position of a single, displaceable control assembly within the valve. Displacive movement of the control assembly changes, in reciprocal proportion, the inlet and outlet flow-metering clearances in each of the chambers of this open-passage type valve. The position of the control assembly determines the inlet and outlet flows within, and, therefore, the net flow through, each chamber. Moreover, since the chambers are each connected (either directly, or through a flow-impeding orifice) to one of the control ports, the position of the control assembly thereby determines the control flow delivered by the valve. Generally, both hydrostatic and hydrodynamic forces within the valve are balanced against corresponding forces, all acting upon the control assembly. However, any internal unbalanced hydrodynamic forces－which arise in proportion to control flow－are compensated by opposing hydrostatic forces, creating a naturally stable servovalve over a wide range of operating conditions.

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A balanced, pressure-compensated, single-stage hydraulic valve system with interconnected fluid-supply, interconnected fluid-return and distinct fluid-control ports, said hydraulic valve system being responsive to applied signals, and said system comprising: (a) a plurality of chambers, with each said chamber having an inlet port, an outlet port, and a chamber port, each connected thereto; (b) a displaceable control assembly, located largely within and extending between said chambers, and having substantially planar means, within each said chamber, with at least one said planar means intervening fully between said inlet port and said outlet port within each said chamber, so that simultaneously each said planar means is in the midrange between said inlet and said outlet ports therebeside when said assembly is positioned midway between displacive extremes; (c) flow-impeding clearances, at least one being an inlet clearance between said planar means and the adjacent wall surrounding said inlet port of said chamber, and at least one being an outlet clearance between said planar means and the adjacent chamber wall surrounding said outlet port therebeside, each such said clearance forming within each said chamber when said control assembly is positioned intermediately between said displacive extremes; (d) guiding means constraining displacive movement of said control assembly to be generally in the manner causing, within each said chamber, said inlet clearance to change in inverse proportion to said outlet clearance; (e) means for displacing said control assembly, and thereby changing said clearances, in proportion to said signals; (f) means to conduct fluid, substantially unimpeded, between each said inlet port and a said supply port, and between each said outlet port and a said return port; further, discrete means to conduct fluid, either relatively impeded or substantially unimpeded, between each said chamber port and a said control port, with each said control port being thus connected to sufficient distinct said chamber ports to thereby utilize at least one said discrete means impeding flow and one said discrete means not impeding flow, but connected only to said chamber ports of said chambers in which displacement of said control assembly changes said inlet clearances similarly therein, and, simultaneously, said outlet clearances similarly therein; (g) means causing the net displacive hydrostatic force acting on said control assembly to counteract any net unbalanced displacive hydrodynamic force also acting thereupon, and, in the absence of unbalanced displacive hydrodynamic forces, to be generally small or nil, and to be negligible or nil when unbalanced displacive hydrodynamic forces are absent and equal pressures exist in all said chambers; whereby, with equal fluid pressures delivered to said supply ports and with equal fluid pressures existing at said return ports, any unbalanced hydrodynamic forces acting to displace said control assembly are offset by proportional hydrostatic forces, thereby stabilizing said assembly between said inlet and said outlet ports, and enabling said system to control the flow delivered through said control ports, in response to said signals, through changes in the relative positions of said planar means within said chambers, by displacement of the thus stabilized said control assembly.

이 특허를 인용한 특허 피인용횟수: 17

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Balanced, pressure-flow-compensated, single-stage servovalve

초록
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이 특허를 인용한 특허 피인용횟수: 17

IPC 상위 출원인

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IPC 상세정보(version : 201201)

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Balanced, pressure-flow-compensated, single-stage servovalve

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이 특허를 인용한 특허 피인용횟수: 17

IPC 상위 출원인

상세정보조회

원문조회

IPC 상세정보(version : 201201)

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