CN101684974B

CN101684974B - Thermostatic expansion valve with bypass applying in air-conditioning system

Info

Publication number: CN101684974B
Application number: CN2008101213442A
Authority: CN
Inventors: 王朝阳; 魏菲
Original assignee: Individual
Current assignee: Ningbo Huacheng Valve Co ltd
Priority date: 2008-09-26
Filing date: 2008-09-26
Publication date: 2011-04-13
Anticipated expiration: 2028-09-26
Also published as: CN101684974A

Abstract

The invention relates to a thermostatic expansion valve with a bypass applying to an air-conditioning system, which comprises an expansion valve body. The thermostatic expansion valve with a bypass is characterized in that a bypass is additionally arranged between a liquid inlet hole and a liquid outlet hole of the expansion valve body, and a check valve is arranged in the bypass, wherein the close direction of the check valve is the same as the flow direction of a refrigerant in normal operation. By integrating the thermostatic expansion valve and the bypass check valve in the valve body, the invention has more compact and reasonable structure, reduces pipelines and joints, decreases installation expense, lowers the possibility of leakage and obtains the original effect.

Description

Be applied to the heating power expansion valve of the band bypass in the air-conditioning system

Technical field

The present invention relates to the heating power expansion valve in a kind of air-conditioning system.

Background technology

In the family expenses air-conditioning system, cold-producing medium requires can reverse flow, and by this type of flow, air-conditioning can provide heat and the indoor cold air that provides is provided in sweltering heat for indoor in cold.For achieving this end, this system generally includes two heat exchangers, and one indoor, and one outdoor, according to refrigeration or the requirement that heats, makes evaporimeter or condenser respectively.For air-conditioning can be worked normally, all to connect a heating power expansion valve on two heat exchangers, and want the bypass of a band check-valves in parallel, the installation direction of two check-valves and expansion valve is opposite.General air-conditioning system operation principle is as described below:

When this system works as refrigeration system (shown in Fig. 1 a filled arrows), compressor is delivered to reversal valve (the diagram solid line is represented reversal valve inner refrigerant path) with cold-producing medium, through reversal valve cold-producing medium is delivered to outdoor heat exchanger again, this moment, outdoor interchanger was made condenser usefulness, cold-producing medium arrives first the expansion fluid hole, because the cold-producing medium of this moment is the gas of HTHP, make the expansion valve import close, cold-producing medium can not pass through expansion valve, cold-producing medium can only be delivered to indoor by the check-valves of bypass, by indoor expansion valve throttling cold-producing medium is delivered to indoor heat exchanger subsequently, this moment, indoor heat exchanger was made evaporimeter usefulness, thereby was reached for the purpose of indoor conveying cold air.Otherwise, when this system works as refrigeration system (shown in Fig. 1 b hollow arrow), the refrigerant flow direction that comes out from reversal valve (the diagram dotted line is represented reversal valve inner refrigerant path) is opposite, outdoor heat exchanger is made evaporimeter and is used, indoor heat exchanger is made condenser and is used, outdoor expansion valve works, and indoor expansion valve is inoperative, and cold-producing medium is delivered to outdoor by check-valves.

Independent check-valves and bypass channel need increase many pipe joints, have increased mounting cost and maintenance cost, in addition, because the increase of pipeline has increased the possibility of leaking.In order to improve above-mentioned many shortcomings, need improve the structure of expansion valve, make itself to have check-valves, and can bring into play identical effect with the minimizing pipeline.

Summary of the invention

Technical problem to be solved by this invention provides a kind of heating power expansion valve that is applied to the band bypass in the air-conditioning system, and its compact conformation is reasonable, makes itself to have check-valves with minimizing pipeline and leakage, and can bring into play identical effect.

The technical scheme of technical solution problem of the present invention is such: a kind of heating power expansion valve that is applied to the band bypass in the air-conditioning system, it includes the expansion valve body, it is characterized in that between the inlet opening of expansion valve body and fluid hole, having increased bypass, and in bypass, being provided with check-valves, the direction of the refrigerant flow direction of the closing direction of check-valves during with operate as normal is identical.

As improvement, its structure of described check-valves is that the expansion valve body is provided with admission chamber respectively and goes out sap cavity in bypass, admission chamber is respectively inlet opening and fluid hole with the outside that goes out sap cavity, admission chamber and go out to be furnished with the check-valves cavity that they are communicated with between the inboard of sap cavity, but the bypass opening and closing element of move left and right is installed in the check-valves cavity, check-valves cavity port part be threaded blocking cap and sealing ring, be supported with spring between bypass opening and closing element and the blocking cap, be convenient to assembling like this and produce and regulate operating pressure, eliminate initial error.

As improvement, described admission chamber is arranged in position, check-valves cavity both sides with the inboard connected entrance that goes out sap cavity, make the bypass opening and closing element under the limit on the left location status, seal up out the inboard connected entrance of sap cavity, and the bypass opening and closing element moves right under the segment distance state, and admission chamber and the inboard connected entrance that goes out sap cavity are communicated with by the check-valves cavity.

Improve, described bypass opening and closing element adopts the approaching nylon of refrigerant density to make again, and has some setbacks to avoid causing bypass to open and close owing to conducting oneself with dignity.

At last, expansion valve chamber and bypass chamber present H shape layout substantially in the described thermal expansion valve body, to make things convenient for processing and manufacturing.

Compared with prior art, the invention has the advantages that: expansion valve and bypass check-valves are integrated in the valve body of body, and structure is compact and reasonable more, reduces pipeline and joint, has reduced mounting cost, has also reduced the possibility of leaking, and reaches original effect.

Description of drawings

Fig. 1 a is traditional air-conditioning work schematic diagram;

Fig. 1 b is that traditional air-conditioning heats schematic diagram;

Fig. 2 is a thermal expansion valve arrangement cutaway view of the present invention;

Fig. 3 be among Fig. 2 A-A to cutaway view;

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As Fig. 2-3 signal, a kind of heating power expansion valve that is applied to the band bypass in the air-conditioning system, it includes expansion valve body 1, and adopt aluminium alloy to make, air inlet, give vent to anger and feed liquor, the fluid pipeline is H type structure roughly, to be different from the F type expansion valve of outer appearance F made of copper, the crucial part of its invention is to have increased bypass 4 between the inlet opening 2 of expansion valve body 1 and fluid hole 3, and in bypass 4, be provided with check-valves 5, the direction of the refrigerant flow direction of the closing direction of check-valves 5 during with operate as normal is identical, and expansion valve chamber A and bypass chamber B present H shape substantially and arrange in the thermal expansion valve body 1.Specifically, check-valves 5 its structures are that expansion valve body 1 is provided with admission chamber 6 respectively and goes out sap cavity 7 in bypass 4, admission chamber 6 is respectively inlet opening 6a and fluid hole 7a with the outside that goes out sap cavity 7, admission chamber 6 and go out to be furnished with the check-valves cavity 8 that they are communicated with between the inboard of sap cavity 7, admission chamber 6 and the inboard connected entrance 6b that goes out sap cavity 7,7b is arranged in position, check-valves cavity 8 both sides, but the bypass opening and closing element 9 of move left and right is installed in the check-valves cavity 8, bypass opening and closing element 9 adopts the approaching nylon of refrigerant density to make, check-valves cavity 8 port part be threaded blocking cap 10 and sealing ring 11, be supported with spring 12 between bypass opening and closing element 9 and the blocking cap 10, make bypass opening and closing element 9 under the limit on the left location status, seal up out the inboard connected entrance 7b of sap cavity 7, and bypass opening and closing element 9 moves right under the segment distance state, and admission chamber 6 and the inboard connected entrance that goes out sap cavity 7 are communicated with by check-valves cavity 8.

We have increased a check-valves 5 between liquid inlet/outlet 6a, the 7a of expansion valve, it is made up of bypass opening and closing element 9, spring 12, sealing ring 11,4 10 smallclothes of blocking cap, the direction of the refrigerant flow direction of its closing direction during with operate as normal is identical, rely on spring 12 power to load for bypass opening and closing element 9, the material of bypass opening and closing element 9 uses the nylon that is close with refrigerant density, avoids having some setbacks owing to deadweight causes bypass to open and close.When the expansion valve operate as normal, cold-producing medium flows to outlet from inlet, pressure in the unit head is greater than the refrigerant saturation pressure of air inlet/outlet at this moment, expansion valve rises and closes the part unlatching, cold-producing medium can when the refrigerant flow direction bypass channel, be exerted pressure to the end of bypass opening and closing element 9 from throttle orifice normal flow mistake, make its closure, prevent that cold-producing medium from flowing through from bypass 4.When the cold-producing medium reverse flow, the cold-producing medium that flows through the expansion valve air inlet/outlet is the gas of HTHP, his pressure surpasses the pressure in the unit head, the opening and closing element of expansion valve is closed, cold-producing medium can not pass through from throttle orifice, refrigerant flow direction bypass 4 passages, and this moment, the pressure of cold-producing medium surpassed the spring force that impels bypass opening and closing element 9 to close, promote bypass opening and closing element 9 and open, cold-producing medium passes through from bypass 4.

Use by reality, this expansion valve can substitute the pipeline of being made up of independent check-valves and independent expansion valve fully, thereby has reduced mounting cost, has also reduced the possibility of leaking, and has reached the purpose of improvement.

Claims

1. heating power expansion valve that is applied to the band bypass in the air-conditioning system, it includes the expansion valve body, it is characterized in that between the inlet opening of expansion valve body and fluid hole, having increased bypass, and in bypass, being provided with check-valves, the direction of the refrigerant flow direction of the closing direction of check-valves during with operate as normal is identical;

Its structure of described check-valves is that the expansion valve body is provided with admission chamber respectively and goes out sap cavity in bypass, admission chamber is respectively inlet opening and fluid hole with the outside that goes out sap cavity, admission chamber and go out to be furnished with the check-valves cavity that they are communicated with between the inboard of sap cavity, but the bypass opening and closing element of move left and right is installed in the check-valves cavity, check-valves cavity port part be threaded blocking cap and sealing ring are supported with spring between bypass opening and closing element and the blocking cap.

2. heating power expansion valve according to claim 1, it is characterized in that described admission chamber and the inboard connected entrance that goes out sap cavity are arranged in position, check-valves cavity both sides, make the bypass opening and closing element under the limit on the left location status, seal up out the inboard connected entrance of sap cavity, and the bypass opening and closing element moves right under the segment distance state, and admission chamber and the inboard connected entrance that goes out sap cavity are communicated with by the check-valves cavity.

3. heating power expansion valve according to claim 2 is characterized in that described bypass opening and closing element adopts the approaching nylon of refrigerant density to make.

4. heating power expansion valve according to claim 3 is characterized in that expansion valve chamber and bypass chamber present H shape substantially in the described thermal expansion valve body to arrange.