Multi-way reversing valve

Abstract

A multi-way reversing valve is provided to make it possible to prevent the pressure of the high-pressure refrigerant from increasing excessively during the transitional stage of flow path reversal without suspending the operation of the compressor, thereby preventing problems in the flow path reversing operation, while at the same time preventing situations where devices would erratically cause operating as a result of erroneous determinations of an anomaly / failure in the device being made by a fail-safe mechanism. The multi-way reversing valve where a high-pressure passage part into which a high-pressure fluid is introduced is formed in a valve member. A valve seat part and valve chamber are in a valve body. First and second inlet / outlets (selectively in communication with an outlet of the high-pressure passage part) are formed in the valve seat part. A low-pressure fluid is introduced into the valve chamber via the first or second inlet / outlet. An outlet-side end part of the high-pressure passage part is adapted to slide while pressed against a part of the valve seat part between the first and second inlet / outlet during a transitional stage of flow path reversal. The positions / dimensions / shapes of the outlet of the high-pressure passage part (and the first, second inlet / outlets) are designed so the high-pressure passage part outlet is in communication with at least one of the first / second inlet / outlet even during the transitional stage of flow path reversal.

Description

technical field [0001] The present invention relates to a multi-way valve such as a three-way valve and a four-way valve used in heat pumps, etc., and more particularly to a rotary multi-way valve that switches the flow path by rotating the valve core through a driver such as a motor composed of a rotor and a stator. through valve. Background technique [0002] Generally, a heat pump (refrigeration cycle) constituting an air conditioner, a refrigeration device, etc. includes a compressor, a gas-liquid separator, a condenser (outdoor heat exchanger), an evaporator (indoor heat exchanger), and an expansion valve, etc. Four-way valve of the flow path (flow direction) switching unit. [0003] The four-way valve used in such heat pumps basically has a valve element that is rotated by a driver such as a motor, and a valve element that holds the valve element rotatably and is provided with a valve seat portion and a valve chamber, as described in Patent Document 1 below. The valv...

AI Technical Summary

Problems solved by technology

[0017] In this way, if the outlet side of the high-pressure passage portion 55 is closed during the transition of flow path switching, although the time is very short, there is no place for the high-pressure refrigerant on the discharge side of the compressor to diffuse. As long as the operation of the compressor is not stopped, the high-pressure refrigerant The pressure will rise sharply, which may cause obstacles to the flow channel switching action, and the fault protection mechanism may misjudge that the device is abnormal or malfunction and stop the device indiscriminately.

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