Four-way valve, refrigerating system and control method of refrigerating system

Abstract

The invention provides a four-way valve, a refrigerating system and a control method of the refrigeration system. The four-way valve comprises a main four-way valve and a pilot four-way valve, whereinthe pilot four-way valve is connected with the main four-way valve, and is used for controlling the flow path direction in the main four-way valve; the main four-way valve comprises an liquid feedingport and three liquid reversing ports; and the four-way valve further comprises a flow path control valve, and the flow path control valve is arranged on a control liquid path where liquid feeding port of the main four-way valve and the pilot four-way valve are connected and is used for controlling connecting and disconnecting of the control liquid path so as to control the amount of the refrigerant entering a control hollow cavity of the main four-way valve through the pilot four-way valve. By applying the technical scheme, the influence of the accumulated liquid in the control hollow cavityon reversing of the main four-way valve can be avoided so that reversing of the four-way valve can be smoother, then normal operation of a unit can be guaranteed, and reversing noise can be reduced.

Description

technical field [0001] The invention relates to the technical field of refrigeration systems, in particular to a four-way valve, a refrigeration system and a control method for the refrigeration system. Background technique [0002] The four-way reversing valve is the circulation path of the refrigerant in the switching system on the refrigeration device to change the functions of the two devices of the air conditioner and realize the switching of cooling, heating and defrosting functions. It is the key control valve in the heat pump unit. [0003] For large air-cooled heat pump units, four-way valves with large cooling capacity are used. Four-way valves are used to drive the main four-way valve to change direction through the pilot four-way valve. After the main four-way valve changes direction, there is a high pressure inside the main four-way valve. Cavity, since the four-way valve is installed outdoors, when the ambient temperature is low, the refrigerant in the high-pr...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a four-way valve, a refrigeration system and a control method for the refrigeration system, so as to solve the technical problem of difficult switching caused by liquid accumulation in the four-way valve in the prior art

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