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Thermal expansion valve for preventing high pressure medium transmission portion from leakage

A thermal expansion valve and high-pressure medium technology, applied in the field of thermal expansion valves, can solve the problems of cooling capacity reduction, system cooling loss, transmission rod stuck, etc., and achieve the effects of easy processing and assembly, strong practicability, and ingenious conception

Active Publication Date: 2008-12-17
ZHEJIANG SANHUA COMMERCIAL REFRIGERATION CONTROLS CO LTD SHAOXING CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned known expansion valve, the transmission rod and the valve body are in clearance fit. When the fit clearance is large, the refrigerant at the high-pressure end (inlet end) will directly enter the pilot cavity through the clearance (called leakage of the high-pressure medium transmission part), and then flow to the expansion valve. The evaporator behind the valve reduces the cooling capacity and affects the normal operation of the system. This situation is a common problem of the known expansion valve; if the matching gap is too small, the transmission rod will be stuck, and the expansion valve cannot control the amount of refrigerant in the system; This pair of contradictions is difficult to take into account when processing the expansion valve
In addition, the leakage of the transmission part of the high-pressure medium not only leads to the loss of cooling capacity of the system, but also to the generation of noise and vibration

Method used

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  • Thermal expansion valve for preventing high pressure medium transmission portion from leakage
  • Thermal expansion valve for preventing high pressure medium transmission portion from leakage
  • Thermal expansion valve for preventing high pressure medium transmission portion from leakage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as image 3 The thermal expansion valve shown includes a valve body 1, an air box head part 2, a valve core part and an adjustment spring 3: the air box head part 2 includes an air box seat 23, an air box cover 21, a diaphragm 22, and a transmission plate 24. The capillary 27 and the temperature sensing package 25 connect the entire air box head part to the upper end of the valve body 1 through the air box seat 23, an upper chamber 26 is formed between the air box cover 21 and the diaphragm 22, the diaphragm 22, the air box The seat 23 constitutes the lower chamber 29, the temperature sensing package 25 communicates with the upper chamber 26 through the capillary 27, and the transmission plate 24 is located on the lower side of the diaphragm 22; the valve body 1 has an inlet 11, an outlet 12 and a valve port 13 connecting the inlet and the outlet, A pilot chamber 14 is formed between the upper end of the valve body 1 and the transmission plate 24, and an external b...

Embodiment 2

[0025] Compared with Embodiment 1, the structure of the thermal expansion valve (except the sealing member) can also be in other forms, such as the adjusting spring shown in Figure 2 is arranged on the lower side of the valve port, which will not be repeated here.

[0026] It should be noted that the essence of the present invention is that a special sealing member is fixed on the valve body, so that when the thermal expansion valve is in operation, the refrigerant at the high-pressure end flows to the pressure expansion tank through the gap between the transmission rod and the valve body to exert pressure on the valve body. on the first elastic sealing part of the sealing member, so that the first elastic sealing part can be better embraced on the transmission rod, and the second elastic sealing part can better maintain a sealing relationship with the valve body to prevent the transmission part from leaking, and the high pressure The higher the pressure of the refrigerant at t...

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PUM

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Abstract

A thermal expansion valve for preventing leakage of a transmission part of a high-pressure medium. A sealing member is fixed on a valve body. The sealing member is composed of a rigid support (52) and a flexible seal, and the first elastic sealing part (51a) of the flexible seal There is a pressure expansion groove (51c) facing the valve port between the second sealing part (51b), the first elastic sealing part (51a) is hugged on the transmission rod (42), the second sealing part (51b) and The valve body remains a tight fit. During operation, the higher the pressure of the refrigerant at the high-pressure end, the stronger the sealing performance of the sealing member, while effectively avoiding the possibility of vibration or noise; and the transmission rod can flexibly move relative to the first elastic sealing part without affecting the sealing effect.

Description

【Technical field】 [0001] The invention relates to a thermal expansion valve structure for throttling expansion of fluid medium, in particular to a thermal expansion valve for preventing leakage of a high-pressure medium transmission part. 【Background technique】 [0002] A thermostatic expansion valve, which controls the flow of fluid through the valve in response to a heat-induced fluid pressure signal, is particularly useful in refrigeration or air conditioning systems for controlling the flow of refrigerant into an evaporator. The high-temperature and high-pressure gaseous refrigerant compressed in the compressor Y flows into the condenser L, is cooled into a high-pressure liquid refrigerant, enters the expansion valve P for throttling and pressure reduction, and then enters the evaporator Z through the outlet of the expansion valve to absorb heat and evaporate. is sucked into the compressor to complete a cycle (see figure 1 ). [0003] The known thermal expansion valve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B41/04F16K1/00F16K41/02
Inventor 祝颖安吕灵秋刘浪吕刚明郑正松
Owner ZHEJIANG SANHUA COMMERCIAL REFRIGERATION CONTROLS CO LTD SHAOXING CITY