Heat expansion valve

Abstract

The present invention provides a thermostatic expansion valve, a valve core with an upper part and a lower part supported by a transmission rod and a valve core frame is arranged in a valve cavity on the lower side of a throttling hole in a valve body, the transmission rod obtains the dynamic force from an air box head component arranged at the upper end of the valve body to press elastically the valve core toward the opening valve direction, the valve core frame obtains the dynamic force from a compression spring supported on the upper part to press elastically the valve core toward the closing valve direction, and a valve core movement preventing component is arranged on the valve core frame. The present invention is characterized in that the valve core movement preventing component is welded on the valve core frame. The thermostatic expansion valve can be arranged reliably on the valve core frame without the great change of a supporting component because the valve core movement preventing component is welded on a rotation stopping part used for preventing the valve core frame of a coil spring, therefore, the part number is not required to be increased, the assembly operation is simple, the cost inflation can be prevented, the oscillating sound induced by the valve core movement and the displacement can not be generated, thereby the noise of the thermostatic expansion valve can be reduced.

Description

technical field [0001] The present invention is a thermodynamic expansion valve, especially when the vehicle air conditioner operates in the refrigerating cycle, it expands the high-temperature and high-pressure refrigerant from the liquid receiver into a low-temperature and low-pressure refrigerant, and controls the low-temperature and low-pressure refrigerant as the heat power of the refrigerant flow rate supplied to the evaporator. Expansion valve. Background technique [0002] Thermal expansion valve, in the valve cavity below the orifice in the valve body, there are valve cores supported by the transmission rod and the valve core frame at the top and bottom respectively. The head part obtains power to support the valve core in the direction of opening the valve, and the valve core frame obtains power from the compression spring supported on it to spring the valve core in the direction of closing the valve; the above-mentioned air box head part is sensed by the evaporato...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defects of many parts, complicated assembly and high cost of processing special structures in order to install the valve core movement prevention parts in the prior art, and to provide a A high-temperature, high-pressure refrigerant inflow valve that controls the flow of high-temperature and high-pressure refrigerant flowing into the valve body by the spool, and can reliably fix the spool movement prevention component without changing the structure of the existing spool frame, and stably assemble it in the above-mentioned valve body. thermal expansion valve

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