Internal balance type expansion valve

Abstract

The invention discloses an internal balance type expansion valve which comprises a ball valve, a membrane, a temperature sensing cylinder, an evaporator and a capillary tube. The ball valve is connected with the membrane through a valve rod. The capillary tube is connected with the upper end of the membrane. The other end of the capillary tube is connected with the temperature sensing cylinder. The other end of the ball valve is connected with a spring assembly. According to the internal balance type expansion valve, a double-current balance flow port of an advanced structure is adopted; due to the fact that the double-current thermostatic expansion valve is adopted, the number of expansion valve bodies, the number of check valves and the number of electromagnetic valves of a refrigerating system are decreased; the static superheat degree is changed along with the change of condensing pressure or pressure drop at a valve port through the double-current balance flow port of the expansion valve, the superheat degree is stable, and the system is made to operate stably. The expansion valve is suitable for various working requirements such as refrigerating and air conditioning.

Description

technical field [0001] The invention relates to the field of refrigeration systems, in particular to an internally balanced expansion valve. Background technique [0002] The expansion valve is an important part in the refrigeration system, generally installed between the liquid storage cylinder and the evaporator. The expansion valve makes the medium-temperature and high-pressure liquid refrigerant become low-temperature and low-pressure wet steam through its throttling, and then the refrigerant absorbs heat in the evaporator to achieve the cooling effect. The expansion valve controls the flow rate of the valve through the change of the superheat at the end of the evaporator to prevent Insufficient utilization of evaporator area and knocking phenomenon. The ideal working state of the expansion valve should be to change the opening in real time and control the flow as the load of the evaporator changes. But in fact, due to the hysteresis in the heat transfer of the tempera...

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Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to solve the problems of slow response, poor quality and poor throttling effect of the expansion valve in the prior art, and provide an internally balanced expansion valve with fast response, good quality and good throttling effect. After the high-temperature and high-pressure liquid refrigerant passes through the orifice of the expansion valve, it becomes a low-temperature and low-pressure mist-like hydraulic refrigerant, creating conditions for the evaporation of the refrigerant.

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