Electric operated valve

Abstract

To reduce, in an electric operated valve controlling the flow rate of a refrigerant by opening and closing a valve port by a needle valve, noise caused by a flow of the refrigerant in the valve port.In a valve housing, a first port 11, a second port 12, a third port 13, a first tapered part 14 and a second tapered part 15, which have circular cross sections, are formed. A refrigerant flowing froma gap between the first port 11 and a needle valve 5a, when flowing out into the second port 12, is inhibited from sharply recovering in pressure in the second port 12 and is straightened in flow tostabilize the flow. With this, rupture of cavitations is suppressed. When the refrigerant flows from the second port 12 to the second tapered part 15 and the third port 13, the flow speed is reduced to reduce the flow velocity sound.

Description

[0001] This application is a divisional application; the application number of its parent case is "2016109732269", and the invention name is "electric valve". technical field [0002] The present invention relates to a needle type electric valve for controlling the flow rate of refrigerant in an air conditioner, and more particularly to an electric valve in which the shape of the valve port relative to the needle valve is improved. Background technique [0003] Conventionally, in the refrigerating cycle, the noise generated from the electric valve controlling the flow rate of the refrigerant and accompanying the passage of the fluid has often been a problem. As an electric valve for implementing such noise countermeasures, there is, for example, an electric valve disclosed in Japanese Patent No. 5696093 (Patent Document 1). [0004] In the electric valve disclosed in Patent Document 1, the valve port is composed of a first port and a second port, and a tapered portion is pro...

AI Technical Summary

Problems solved by technology

Therefore, the fluid is rectified, but the flow velocity in the second port does not slow down, and noise may be generated due to flow velocity sound (sound caused by a high flow velocity)

In particular, when the load is high, the differential pressure between the front and back of the valve port is high, and this flow velocity sound becomes an important factor for the high noise.

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