Three-way reversing valve and refrigerating system

Abstract

The invention discloses a three-way reversing valve and a refrigerating system.The three-way reversing valve comprises a main valve, the main valve is provided with a D connecting pipe, an E connecting pipe and a C connecting pipe, and when a valve element assembly is located at a first position, the D connecting pipe is communicated with the E connecting pipe; when the valve element assembly is located at the second position, the D connecting pipe is communicated with the C connecting pipe; one end of the capillary tube is connected with a first end cover part of the main valve, and the connecting pipe E can be communicated with a compressor inlet of the refrigerating system through the capillary tube; when the three-way reversing valve is located at the second position, the connecting pipe D is communicated with the connecting pipe C, the first condenser works normally, the connecting pipe E is isolated, the connecting pipe E is connected with the second condenser or the reheater to stop working, the capillary tube is communicated with an inlet of the compressor, and refrigerants in a reheater pipeline or the second condenser can return to the compressor through the capillary tube and return to a circulating system. And non-participated pipeline refrigerants can flow back to the system, the refrigerant utilization rate can be relatively increased, and the product energy efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration control, and in particular to a three-way reversing valve and a refrigeration system. Background Art

[0002] The three-way reversing valve is a valve widely used in fluid medium pipeline systems to switch the flow direction of the medium. At present, there are multiple parallel pipelines or series reheaters in the system, and the flow path can be selected from two options. The unselected pipelines do not participate in the work. For technical personnel in this field, it is necessary to make the refrigerant in the pipelines that do not participate automatically return to the system as much as possible to improve the utilization rate of the refrigerant and improve energy efficiency. Summary of the invention

[0003] The present invention provides a three-way reversing valve, which can relatively increase the utilization rate of refrigerant and improve product energy efficiency.

[0004] A three-way reversing valve provided by the present invention is characterized in that it comprises a main valve, the main valve comprises a first end cover portion, the main valve is provided with a D-connecting pipe, an E-connecting pipe and a C-connecting pipe, the D-connecting pipe is connected to the compressor outlet, the E-connecting pipe is connected to the first condenser, and the C-connecting pipe is connected to the second condenser or the reheater, when the three-way reversing valve is in a first position, the D-connecting pipe is connected to the E-connecting pipe, and when the three-way reversing valve is in a second position, the D-connecting pipe is connected to the C-connecting pipe;

[0005] The three-way reversing valve also includes a capillary tube, one end of which is connected to the first end cover, and the other end of which is connected to the E-connecting pipe. The capillary tube can be connected to the inlet of the compressor.

[0006] The present invention optimizes the design of the three-way reversing valve and adds a capillary tube, one end of the capillary tube is connected to the first end cover, and the other end of the capillary tube is connected to the E pipe. In this way, when the three-way reversing valve is in the second position, the D pipe is connected to the C pipe, the first condenser works normally, the E pipe is isolated, the E pipe is connected to the second condenser or the reheater stops working, the capillary tube is connected to the compressor inlet, and the refrigerant in the reheater pipeline or the second condenser can return to the compressor through the capillary tube and return to the circulation system, so that the refrigerant in the pipeline that does not participate can flow back to the system, which can relatively improve the refrigerant utilization rate and improve the product energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A three-dimensional structural schematic diagram of a three-way reversing valve of the present invention;

[0008] Figure 2 for Figure 1 The cross-sectional structure diagram of the three-way reversing valve shown in FIG.

[0009] Figure 3This is a schematic diagram of the principle of the first specific implementation mode of the refrigeration system provided by the present invention;

[0010] Figure 4 This is a schematic diagram of the principle of a second specific implementation manner of the refrigeration system provided by the present invention.

[0011] in, Figures 1 to 4 The one-to-one correspondence between component names and reference numerals is as follows:

[0012] 10- compressor; 11- first condenser; 12- second condenser; 13- evaporator; 14- filter component;

[0013] 20-compressor; 21-reheater; 22-condenser; 23-switching valve; 24-evaporator; 25-filter component;

[0014] 30-three-way reversing valve; 311-capillary tube; 32-piston; 33-slider; 34-pilot valve; 35-sliding bowl; 36-electromagnetic coil; 37-main valve; 370-hollow cylinder; 371-first end; 372-second end. DETAILED DESCRIPTION

[0015] The core of the present invention is to provide a three-way reversing valve, which can improve the utilization rate of refrigerant and improve the energy efficiency of the system.

[0016] As described in the background technology, when the three-way reversing valve is working, part of the piping system of the entire system participates in the work, and part of the piping system does not participate in the work. This article finds that: taking the three-way reversing valve applied to the refrigeration system as an example, there must be refrigerant in the piping system that does not participate in the work. This part of the refrigerant is retained in the pipeline and cannot enter the system for circulation, which seriously affects the overall working performance of the system.

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Please refer to Figures 1 to 4 , Figure 1 A three-dimensional structural schematic diagram of a three-way reversing valve of the present invention; Figure 2 for Figure 1 The cross-sectional structure diagram of the three-way reversing valve shown in FIG. Figure 3 This is a schematic diagram of the principle of the first specific implementation mode of the refrigeration system provided by the present invention; Figure 4 This is a schematic diagram of the principle of a second specific implementation manner of the refrigeration system provided by the present invention.

[0019] The present invention provides a three-way reversing valve 30, including a main valve 37, the main valve 37 includes a housing 370 enclosing a valve cavity, and a valve core assembly capable of reciprocating movement is arranged inside the valve cavity. A D pipe, an E pipe and a C pipe are arranged on the valve cavity wall of the housing, when the valve core assembly is in a first position, the D pipe is connected to the E pipe; when the valve core assembly is in a second position, the D pipe is connected to the C pipe.

[0020] The valve core assembly may include a piston 32 and a slider 33. The piston and the slider 33 reciprocate left and right inside the valve cavity to alternately be in a first position and a second position so that the inlet is connected to different outlets.

[0021] At least one of the E-connecting pipe and the C-connecting pipe is provided with a capillary tube, one end of the capillary tube is connected to the E-connecting pipe or the C-connecting pipe, and the other end is connected to the compressor inlet pipe of the refrigeration system.

[0022] In the embodiment of the present invention, the three-way reversing valve is further provided with a capillary tube 311, one end of the capillary tube 311 is connected to the first end cover portion 371, and the other end of the capillary tube 311 is connected to the E-connecting pipe. The capillary tube 311 can be connected to the inlet of the compressor.

[0023] A capillary tube may also be provided on the C-connecting pipe, and two ends of the capillary tube are connected to the C-connecting pipe and the compressor inlet.

[0024] The figures herein only show a specific implementation of providing the capillary 311 on the E-tube.

[0025] In the embodiment of the present invention, the E pipe can be connected to the first condenser 11, and the C pipe can be connected to the second condenser 12 or the reheater. When the three-way reversing valve is in the first position, the D pipe is connected to the E pipe, and when the three-way reversing valve is in the second position, the D pipe is connected to the C pipe. The following takes the specific use of the three-way reversing valve 30 in two different refrigeration systems as an example to specifically introduce the technical effect of the three-way reversing valve 30 provided in this article.

[0026] Please refer to Figure 3 In the first refrigeration system, the refrigeration system includes a compressor 10, a first condenser 11 and a second condenser 12, wherein the first condenser 11 and the second condenser 12 are connected in parallel, and the outlet pipe of the compressor 10 is connected to the first condenser 11 and the second condenser 12 through a three-way reversing valve 30, that is, the outlet pipe of the compressor 10 is connected to the D pipe of the three-way reversing valve 30, the E pipe of the three-way reversing valve 30 is connected to the first condenser 11, and the C pipe is connected to the second condenser 12.

[0027] When the three-way reversing valve 30 is in the first position, the D pipe is connected to the E pipe, the outlet pipe of the compressor 10 is connected to the first condenser 11 through the three-way reversing valve 30, and the refrigerant medium flowing out of the outlet of the compressor 10 enters the first condenser 11. At this time, the second condenser 12 and the outlet pipe of the compressor 10 are disconnected; when the three-way reversing valve 30 is in the second position, the outlet pipe of the compressor 10 is connected to the second condenser 12 through the three-way reversing valve 30, and the refrigerant medium flowing out of the outlet of the compressor 10 enters the second condenser 12. At this time, the compressor 10 is disconnected from the first condenser 12.

[0028] Taking the E-connecting pipe provided with a capillary tube 31 as an example, when the outlet of the compressor 10 is disconnected from the first condenser 11, the refrigerant medium inside the first condenser 11 can flow into the compressor inlet position through the capillary tube 21 connected to the E-connecting pipe, and then enter the system operation.

[0029] Similarly, the C-connection pipe may also be provided with a capillary tube, so that when the three-way reversing valve 30 is reversed, the refrigerant medium retained in the second condenser 12 may also return to the circulation system and participate in the work.

[0030] In the second refrigeration system, the refrigeration system includes a compressor 20, a reheater 21 and a condenser 22, wherein the reheater 21 and the condenser 22 are connected in series, the reheater 21 is connected in parallel with the direct-connected pipeline, and a switch valve 23 is provided on the direct-connected pipeline, that is, when the switch valve 23 is in a connected state, the refrigerant medium will not pass through the reheater, but will flow to the condenser 22 through the direct-connected pipeline, and when the switch valve 23 is in a disconnected state, the direct-connected pipeline is disconnected, and the refrigerant medium flows to the condenser through the reheater.

[0031] The three-way reversing valve 30 is installed between the outlet pipe of the compressor and the reheater 21 and the direct-connected pipeline. When the three-way reversing valve 30 is in the first position, the outlet pipe of the compressor 20 is connected to the reheater 21 through the three-way reversing valve 30, and the refrigerant medium flowing out of the compressor outlet enters the reheater and then flows to the condenser 22; when the three-way reversing valve 30 is in the second position, the switch valve is in a connected state at the same time, the outlet pipe of the compressor 20 is connected to the direct-connected pipeline through the three-way reversing valve 30, and the refrigerant medium flowing out of the compressor 20 outlet directly enters the condenser 22 through the direct-connected pipeline, and the reheater 21 is in a non-working state.

[0032] In this system, only a capillary tube 311 is required to be provided at the E-connection pipe to meet the working requirements of the system. When the reheater is not in operation, the refrigerant medium inside it can return to the compressor inlet pipe along the capillary tube 311.

[0033] The present invention optimizes the design of the three-way reversing valve and adds a capillary tube 311. One end of the capillary tube 311 is connected to the first end cover portion 38, and the other end of the capillary tube 311 is connected to the E pipe. In this way, when the three-way reversing valve is in the second position, the D pipe is connected to the C pipe, the second condenser 12 works normally, the E pipe is isolated, the E pipe is connected to the first condenser 11 or the reheater stops working, the capillary tube 311 is connected to the compressor inlet 201, and the refrigerant in the reheater pipeline or the first condenser 11 can return to the compressor 20 through the capillary tube 311, and return to the circulation system, so that the non-participating pipeline refrigerant can flow back into the system, which can relatively improve the refrigerant utilization rate and improve the product energy efficiency.

[0034] In a specific embodiment, the valve cavity includes a first cavity 30a and a second cavity 30b which are isolated and arranged on both sides of the valve core assembly. The three-way reversing valve 30 also includes a pilot valve 34 for controlling the reciprocating motion of the valve core assembly. In other words, the three-way reversing valve 30 includes two parts: a main valve 37 and a pilot valve 34, wherein the pilot valve 34 mainly controls the motion of the valve core assembly in the main valve 37. A specific embodiment of the pilot valve 34 is given below.

[0035] The three-way reversing valve 30 also includes a first capillary tube d, a second capillary tube e, a third capillary tube c and a fourth capillary tube s. The inner ends of the above four capillaries are fixed to the pilot valve 34, and the outer ends of the first capillary tube d, the second capillary tube e, the third capillary tube c and the fourth capillary tube s are respectively connected to the D connecting pipe, the first chamber 30a, the second chamber 30b and the inlet 201 of the compressor 20.

[0036] When the pilot valve 34 is in the first working state, the D pipe of the main valve 37 is connected to the E pipe through the first cavity 30a, and the inner end of the third capillary tube c is connected to the fourth capillary tube s through the inside of the pilot valve 34. When the pilot valve 34 is in the first working state, its control valve core assembly is in the first position, the D pipe and the E pipe of the main valve 37 are connected, and the refrigerant flows into the main valve 37 from the D pipe and flows out from the E pipe. At this time, the inner end of the third capillary tube c is connected to the fourth capillary tube s, because the fourth capillary tube s is connected to the inlet pipe of the compressor, and the third capillary tube c is the low-pressure side at this time, and the refrigerant in the second cavity connected to the outer end of the third capillary tube c can enter the inlet pipe of the compressor along the third capillary tube c.

[0037] When the pilot valve 34 is in the second working position, the D pipe is connected to the C pipe through the second cavity 30b, and the second capillary tube e is connected to the fourth capillary tube s through the inside of the pilot valve 34. When the pilot valve 34 is in the second working state, its control valve core assembly is in the second position, the D pipe is connected to the C pipe through the second cavity 30b, and the second capillary tube s is connected to the fourth capillary tube s through the inside of the pilot valve 34. At this time, the refrigerant flows into the main valve 37 from the D pipe and flows out from the C pipe. The second capillary tube e is connected to the fourth capillary tube in a low-pressure state, and the refrigerant retained in the first cavity 30a can flow into the compressor inlet 201 along the second capillary tube e and the fourth capillary tube s.

[0038] By controlling the operation of the main valve 37 through the pilot valve 34 , the structure of the main valve 37 can be simplified.

[0039] In the above embodiments, the E pipe is connected to the first chamber 30a through the capillary 311, that is, the E pipe and the inlet of the compressor 20 are indirectly connected through the capillary 311, the second capillary e and the fourth capillary s.

[0040] Similarly, the C-tube can also be connected to the second cavity through the capillary tube.

[0041] The pilot valve 34 may be an electromagnetically controlled pilot valve 34 , which further includes an electromagnetic coil 36 and a sliding bowl 35 . The electromagnetic coil 36 controls the sliding bowl 35 to reciprocate, so as to realize that the pilot valve 34 is in a first working state and a second working state.

[0042] In the above embodiments, the capillary 311 can be partially disposed outside the housing, that is, the capillary is partially independent of the housing, and the fixing and connecting functions of the capillary can be achieved by only providing a connecting hole and a mounting hole on the housing. This embodiment has a simple structure.

[0043] In the above embodiments, the shell 370 may include a hollow cylinder 373, and a first end cover portion 371 and a second end cover portion 372 located at both ends of the hollow cylinder 373, the D pipe, the E pipe and the C pipe are all arranged in the hollow cylinder 373, and the capillary 311 is fixed to the first end cover portion 371.

[0044] The first end cover portion 371 and the second end cover portion 372 can be integrated with the hollow cylinder 373 by welding.

[0045] Since the above-mentioned refrigeration system includes the above-mentioned three-way reversing valve 30 , the refrigeration system also has the above-mentioned technical effect of the three-way reversing valve 30 .

[0046] Each of the above refrigeration systems may further include other components, such as an evaporator, a filter component, etc. Figure 3 The filter element 14 and the evaporator 13, Figure 4The filter component 25 and the evaporator 24 in the refrigeration system. Other structures of the refrigeration system can refer to the prior art and will not be described in detail here.

[0047] The above is a detailed introduction to a three-way reversing valve 30 and a refrigeration system provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A three-way reversing valve, characterized in that: The main valve comprises a main valve, the main valve comprises a first end cover, the main valve is provided with a D-connecting pipe, an E-connecting pipe and a C-connecting pipe, the D-connecting pipe is connected to the compressor outlet, the E-connecting pipe is connected to the first condenser, the C-connecting pipe is connected to the second condenser or the reheater, when the three-way reversing valve is in the first position, the D-connecting pipe is connected to the E-connecting pipe, when the three-way reversing valve is in the second position, the D-connecting pipe is connected to the C-connecting pipe; The three-way reversing valve also includes a capillary tube, one end of which is connected to the first end cover, and the other end of which is connected to the E-connecting pipe. The capillary tube can be connected to the inlet of the compressor.

2. The three-way reversing valve according to claim 1, characterized in that: The main valve is surrounded by a housing of a valve cavity, and a valve core assembly capable of reciprocating movement is arranged inside the valve cavity; the valve cavity comprises a first cavity and a second cavity which are isolated and arranged on both sides of the valve core assembly; The three-way reversing valve further includes a pilot valve for controlling the reciprocating motion of the valve core assembly; the three-way reversing valve further includes a first capillary, a second capillary, a third capillary and a fourth capillary, the inner ends of which are fixed to the pilot valve, and the outer ends of the first capillary, the second capillary, the third capillary and the fourth capillary are respectively connected to the D-type connecting pipe, the first cavity, the second cavity and the inlet of the compressor; When the pilot valve is in the first working state, the D pipe is connected to the E pipe through the first cavity, and the inner end of the third capillary is connected to the fourth capillary through the inside of the pilot valve; When the pilot valve is in the second working state, the inlet is connected to the C-type pipe through the second cavity, and the second capillary is connected to the fourth capillary through the inside of the pilot valve.

3. The three-way reversing valve according to claim 2, characterized in that: The E-tube is connected to the first cavity through the capillary tube.

4. The three-way reversing valve according to claim 2, characterized in that: The pilot valve is an electromagnetically controlled pilot valve, which further includes an electromagnetic coil and a sliding bowl. The electromagnetic coil controls the reciprocating motion of the sliding bowl to realize that the pilot valve is in a first working state and a second working state.

5. The three-way reversing valve according to any one of claims 1 to 4, characterized in that: The capillary tube is arranged outside the shell.

6. The three-way reversing valve according to claim 5, characterized in that: The shell comprises a hollow cylinder, the first end cover and the second end cover are respectively fixed to both ends of the hollow cylinder, the D connecting pipe, the E connecting pipe and the C connecting pipe are all arranged on the hollow cylinder, and the capillary is fixedly connected to the first end cover.

7. A refrigeration system comprising a compressor, and a first condenser and a second condenser connected in parallel, characterized in that: It also includes the three-way reversing valve according to any one of claims 1 to 6, wherein the inlet of the three-way reversing valve is connected to the outlet pipe of the compressor, the E pipe of the three-way reversing valve is connected to the first condenser, and the C pipe is connected to the second condenser.

8. A refrigeration system comprising a compressor and a reheater connected in series, characterized in that: It also includes the three-way reversing valve as described in any one of claims 1 to 6 above, and also includes a direct-connected pipeline in parallel with the reheater, on which a switch and a condenser are provided, a valve, the inlet of the three-way reversing valve is connected to the outlet pipe of the compressor, the E pipe of the three-way reversing valve is connected to the inlet of the reheater, and the C pipe is connected to the direct-connected pipeline.

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