Expansion Valve

Abstract

An expansion valve relating to the field of air conditioning technology. The present expansion valve comprises a housing, a cylindrical valve body with an inner cavity fixed inside the housing. In the inner cavity, there is a matched set of the first valve core and the second valve core sliding along it. A retaining ring is fixed in the inner cavity between the two valve cores. At both ends of the inner cavity there are spring assemblies driving the valve cores towards the retaining ring. A damping structure is also installed between the first valve core and the second valve core. In this manner, a cushioning effect is provided when the first valve core approaches the second valve core, which lightens the impacts to valve cores and thereby extend the service life of the expansion valve.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The present invention relates generally to the field of air conditioning technology, and more particularly to a mechanical and automatic valve for use in inverter air conditioning and refrigeration.[0003]2. Related Art[0004]The expansion valve is an important component of refrigeration systems, generally installed between the condenser and the evaporator. It enables the gas evaporated by the evaporator passing through the compressor, being pressurized and liquefied into liquid refrigerant at high temperature and high pressure, passing through its throttle orifice and getting throttled into atomized liquid refrigerant at low temperature and low pressure, and, then, the refrigerant absorbs heat in the evaporator to realize a cooling effect. The expansion valve controls the flow rate according to changes in superheat at the end of the evaporator, so as to prevent under utilization of the evaporator surface due to over restrict...

AI Technical Summary

Benefits of technology

[0026]1. The structure is simple. The direction of the expansion valve can be controlled by controlling the pressure change of the cooling pipeline with a reversing valve.

[0027]2. The damping structure keeps the differences between the pressure of the inner cavity and the outlet and the inlet pressures balanced, and maintains the required pressure for refrigerant compressing and liquefying. Meanwhile, the valve cores keep static when the flow rate of the refrigerant is small, which reduces the frequent movements of the spring, and extends the service life of the components of the expansion valve.

[0028]3. The front damping chamber arising between the first valve core and the second valve core provides good cushion when the first valve core the second valve core contact each other, lightens the impacts and extends the service life of

Problems solved by technology

However, due to its higher cost, electronic expansion valve, sometimes, may be replaced by capillary tubes, and normal compressors by inverter compressors.

However, although this type of two-way expansion valve does entertain two-way flow, it is actually not meant for two-way flow.

When the flow is backwards, the refrigerant could

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