FLOW RATE MEASURING DEVICE AND VARIABLE DISPLACEMENT COMPRESSOR
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United States of America Patent
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Issued Date -
Nov 3, 2016
app pub date -
Dec 18, 2014
filing date -
Dec 26, 2013
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status (Latency Note)
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Abstract
In a flow rate measuring device for measuring a refrigerant discharge flow rate in a variable displacement compressor, a check valve is used as a throttle for measuring the flow rate to thereby simplify the configuration while an anti-backflow function of the check valve is secured. The device includes a spool 252 receiving, at one pressure receiving surface, a pressure on an upstream side of the check valve and, at an opposite pressure receiving surface, a pressure on a downstream side to slide in a housing 251 such that a differential pressure therebetween balances a biasing force of a compression coil spring 253, and a sensor detecting a position of the spool 252 to measure the flow rate (magnetic force measuring unit 256). The housing 251 includes a position regulation part (regulation surface 251a3) which regulates a position of the spool 252 to close a gap between the hosing 251 and the spool 252 when the differential pressure falls below a predetermined value.
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