A tee-valve and a refrigeration system

Abstract

This invention discloses a three-way reversing valve and a refrigeration system. The three-way reversing valve includes a main valve with D-connector, E-connector, and C-connector. When the valve core assembly is in the first position, D-connector and E-connector are connected. When the valve core assembly is in the second position, D-connector and C-connector are connected. E-connector is provided with a capillary tube, one end of which is connected to the first end cap of the main valve. E-connector can be connected to the compressor inlet of the refrigeration system through the capillary tube. Thus, when the three-way reversing valve is in the second position, D-connector and C-connector are connected, the first condenser operates normally, E-connector is isolated, and the second condenser or reheater connected to E-connector 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. This allows the refrigerant in the pipeline that is not involved to flow back into the system, which can relatively improve the refrigerant utilization rate and improve the product energy efficiency.

Description

Technical Field

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

[0002] Three-way reversing valves are widely used in fluid media pipeline systems to switch the direction of media flow. Currently, systems may have multiple parallel pipelines or series reheaters. Two flow paths can be selected, and the unselected pipeline does not participate in the operation. For those skilled in the art, it is necessary to make the refrigerant of the unparticipated pipeline automatically flow back into the system as much as possible to improve refrigerant utilization and energy efficiency. Summary of the Invention

[0003] This invention provides a three-way reversing valve that can relatively improve refrigerant utilization and enhance product energy efficiency.

[0004] The present invention provides a three-way reversing valve, characterized in that it includes a main valve, the main valve including a first end cap, the main valve having a D-connector, an E-connector and a C-connector, the D-connector being connected to the compressor outlet, the E-connector being connected to the first condenser, and the C-connector being connected to the second condenser or reheater; when the three-way reversing valve is in the first position, the D-connector and the E-connector are connected; when the three-way reversing valve is in the second position, the D-connector and the C-connector are connected.

[0005] The three-way reversing valve also includes a capillary tube, one end of which is connected to the first end cap and the other end of which is connected to the E-connector. The capillary tube is capable of communicating with the inlet of the compressor.

[0006] This invention optimizes the design of the three-way reversing valve by adding a capillary tube. One end of the capillary tube is connected to the first end cap, and the other end is connected to the E-connector. When the three-way reversing valve is in the second position, the D-connector and the C-connector are connected, the first condenser operates normally, the E-connector is isolated, and the E-connector is connected to the second condenser or reheater, which 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 back to the circulation system. This allows the refrigerant in the pipeline that is not involved to flow back into the system, which can relatively improve the refrigerant utilization rate and improve the product's energy efficiency. Attached Figure Description

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

[0008] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the three-way directional valve.

[0009] Figure 3A schematic diagram illustrating the principle of the first specific embodiment of the refrigeration system provided by the present invention;

[0010] Figure 4 This is a schematic diagram illustrating the principle of a second specific embodiment 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 in the attached drawings is shown below:

[0012] 10-Compressor; 11-First condenser; 12-Second condenser; 13-Evaporator; 14-Filter assembly;

[0013] 20-Compressor; 21-Reheater; 22-Condenser; 23-On / Off Valve; 24-Evaporator; 25-Filter Components;

[0014] 30-Three-way directional valve; 311-Capillary tube; 32-Piston; 33-Slider; 34-Pilot valve; 35-Slide cup; 36-Solenoid coil; 37-Main valve; 370-Hollow cylinder; 371-First end; 372-Second end. Detailed Implementation

[0015] The core of this invention is to provide a three-way reversing valve that can improve refrigerant utilization and system energy efficiency.

[0016] As described in the background section, when a three-way directional valve is in operation, part of the piping system participates in the operation, while another part does not. This paper finds that, taking the application of a three-way directional valve in a refrigeration system as an example, the non-operating piping system inevitably contains refrigerant. This portion of the refrigerant remains in the piping and cannot enter the system for circulation, severely affecting the overall performance of the system.

[0017] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Please refer to Figures 1 to 4 , Figure 1 This is a three-dimensional structural schematic diagram of a three-way reversing valve according to the present invention; Figure 2 for Figure 1 The diagram shows a cross-sectional view of the three-way directional valve. Figure 3 A schematic diagram illustrating the principle of the first specific embodiment of the refrigeration system provided by the present invention; Figure 4 This is a schematic diagram illustrating the principle of a second specific embodiment of the refrigeration system provided by the present invention.

[0019] This invention provides a three-way directional valve 30, including a main valve 37. The main valve 37 includes a housing 370 forming a valve cavity, and a reciprocating valve core assembly is provided inside the valve cavity. A D-connector, an E-connector, and a C-connector are provided on the valve cavity wall of the housing. When the valve core assembly is in a first position, the D-connector and the E-connector are connected; when the valve core assembly is in a second position, the D-connector and the C-connector are connected.

[0020] The valve core assembly may include a piston 32 and a slider 33. The piston and slider 33 reciprocate left and right inside the valve chamber to alternately occupy a first position and a second position, with the inlet connecting to different outlets.

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

[0022] In this embodiment of the 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 371, and the other end of the capillary tube 311 is connected to the E-connector. The capillary tube 311 can be connected to the inlet of the compressor.

[0023] A capillary tube can also be installed on the C-connector, with both ends of the capillary tube connecting the C-connector and the compressor inlet.

[0024] The figures in this article only show a specific implementation where the capillary 311 is installed in the E-connector.

[0025] In this embodiment of the invention, the E-connector can be connected to the first condenser 11, and the C-connector can be connected to the second condenser 12 or the reheater. When the three-way reversing valve is in the first position, the D-connector and the E-connector are connected; when the three-way reversing valve is in the second position, the D-connector and the C-connector are connected. The technical effects of the three-way reversing valve 30 provided herein will be specifically described below using examples of its application in two different refrigeration systems.

[0026] Please refer to Figure 3 In the first type of 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-connector of the three-way reversing valve 30, the E-connector of the three-way reversing valve 30 is connected to the first condenser 11, and the C-connector is connected to the second condenser 12.

[0027] When the three-way reversing valve 30 is in the first position, the D-connector and the E-connector are connected, and the outlet pipe of the compressor 10 is connected to the first condenser 11 through the three-way reversing valve 30. The refrigerant flowing out of the outlet of the compressor 10 enters the first condenser 11. At this time, the second condenser 12 is disconnected from the outlet pipe of the compressor 10. 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. The refrigerant 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-connector with a capillary tube 31 as an example, when the outlet of the compressor 10 is disconnected from the first condenser 11, the refrigerant inside the first condenser 11 can flow into the compressor inlet through the capillary tube 21 connected to the E-connector, and then enter the system for operation.

[0029] Similarly, capillary tubes can also be installed on the C-connector, so that when the three-way reversing valve 30 reverses, the refrigerant retained in the second condenser 12 can return to the circulation system and participate in the operation.

[0030] In the second type of refrigeration system, the refrigeration system includes a compressor 20, a reheater 21, and a condenser 22. The reheater 21 and the condenser 22 are connected in series, and the reheater 21 is connected in parallel with a direct connection pipe. A switch valve 23 is installed on the direct connection pipe. That is, when the switch valve 23 is in the open state, the refrigerant will not pass through the reheater and will flow to the condenser 22 through the direct connection pipe. When the switch valve 23 is in the open state, the direct connection pipe is disconnected, and the refrigerant flows to the condenser through the reheater.

[0031] The three-way reversing valve 30 is installed between the compressor outlet pipe and the reheater 21 and the direct connection pipe. When the three-way reversing valve 30 is in the first position, the compressor outlet pipe is connected to the reheater 21 through the three-way reversing valve 30, and the refrigerant 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 simultaneously in the connected state, and the compressor outlet pipe is connected to the direct connection pipe through the three-way reversing valve 30. The refrigerant flowing out of the compressor outlet directly enters the condenser 22 through the direct connection pipe. At this time, the reheater 21 is in a non-working state.

[0032] The system only needs to have a capillary tube 311 installed at the E-connector to meet the system's operating requirements. When the reheater is not in operation, the refrigerant inside it can return to the compressor inlet pipe along the capillary tube 311.

[0033] This invention optimizes the design of the three-way reversing valve by adding a capillary tube 311. One end of the capillary tube 311 is connected to the first end cap 38, and the other end is connected to the E-connector. When the three-way reversing valve is in the second position, the D-connector and the C-connector are connected, the second condenser 12 operates normally, the E-connector is isolated, and the E-connector connects 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. This allows the refrigerant in the pipeline that is not involved to flow back into the system, which can relatively improve the refrigerant utilization rate and improve the product energy efficiency.

[0034] In one specific embodiment, the valve chamber includes a first chamber 30a and a second chamber 30b isolated on both sides of the valve core assembly. The three-way directional valve 30 also includes a pilot valve 34 for controlling the reciprocating motion of the valve core assembly. That is, the three-way directional valve 30 includes two parts: a main valve 37 and a pilot valve 34, wherein the pilot valve 34 mainly controls the movement 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 d, a second capillary e, a third capillary c, and a fourth capillary s. The inner ends of the four capillary tubes are all fixed to the pilot valve 34. The outer ends of the first capillary d, the second capillary e, the third capillary c, and the fourth capillary s are respectively connected to the D-connector, 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-connector of the main valve 37 is connected to the E-connector through the first chamber 30a, and the inner end of the third capillary tube c is connected to the fourth capillary tube s through the interior 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-connector and E-connector of the main valve 37 are connected, and the refrigerant flows into the main valve 37 from the D-connector and flows out from the E-connector. At this time, the inner end of the third capillary tube c is connected to the fourth capillary tube s. Since the fourth capillary tube s is connected to the compressor inlet pipe, the third capillary tube c is on the low-pressure side. The refrigerant in the second chamber connected to the outer end of the third capillary tube c can enter the compressor inlet pipe along the third capillary tube c.

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

[0038] The structure of the main valve 37 can be simplified by controlling the action of the pilot valve 34.

[0039] In the above embodiments, the E-connector is connected to the first cavity 30a through the capillary tube 311. That is, the E-connector and the inlet of the compressor 20 are indirectly connected through the capillary tube 311, the second capillary tube e, and the fourth capillary tube s.

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

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

[0042] In the above embodiments, the capillary tube 311 can be partially disposed outside the housing. That is, the capillary tube is independent of the housing. The capillary tube can be fixed and connected simply by providing a connecting hole and a mounting hole on the housing. This embodiment has a simple structure.

[0043] In the above embodiments, the housing 370 may include a hollow cylinder 373, and a first end cap 371 and a second end cap 372 located at both ends of the hollow cylinder 373. The D-connector, E-connector and C-connector are all disposed in the hollow cylinder 373, and the capillary tube 311 is fixed to the first end cap 371.

[0044] The first end cap 371 and the second end cap 372 can be integrally formed with the hollow cylinder 373 by welding.

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

[0046] The aforementioned refrigeration systems may further include other components, such as evaporators and filters. Figure 3 The filter element 14 and the evaporator 13 are included. Figure 4The filter element 25 and evaporator 24 are included. Other structures of the refrigeration system can be found in existing technology and will not be described in detail here.

[0047] The foregoing has provided a detailed description of a three-way reversing valve 30 and a refrigeration system provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A three-way directional valve, characterized in that, Includes a main valve, the main valve including a first end cap, the main valve having a D-connector, an E-connector and a C-connector, the D-connector being connected to the compressor outlet, the E-connector being connected to the first condenser, and the C-connector being connected to the second condenser or reheater; The main valve forms a housing that encloses a valve cavity, and the valve cavity contains a reciprocating valve core assembly. The valve cavity includes a first cavity and a second cavity isolated on both sides of the valve core assembly. The three-way directional valve also includes a pilot valve for controlling the reciprocating motion of the valve core assembly. The three-way directional valve also includes a first capillary tube, a second capillary tube, a third capillary tube, and a fourth capillary tube whose inner ends are fixed to the pilot valve. The outer ends of the first capillary tube, the second capillary tube, the third capillary tube, and the fourth capillary tube are respectively connected to the D-connector, the first cavity, the second cavity, and the compressor inlet. The three-way reversing valve further includes a fifth capillary tube, one end of which is connected to the first end cap to communicate with the first chamber, and the other end of which is connected to the E-connector. When the three-way reversing valve is in the first position, the D-connector is connected to the E-connector. When the three-way reversing valve is in the second position, the D-connector is connected to the C-connector. The fifth capillary tube is connected to the compressor inlet through the first chamber, the second capillary tube, the pilot valve, and the fourth capillary tube.

2. The three-way directional valve as described in claim 1, characterized in that, The pilot valve is an electromagnetically controlled pilot valve, which also includes an electromagnetic coil and a sliding cup. The electromagnetic coil controls the reciprocating motion of the sliding cup.

3. The three-way directional valve as described in any one of claims 1 to 2, characterized in that, The fifth capillary is disposed on the outside of the housing.

4. The three-way directional valve as described in claim 3, characterized in that, The housing includes a hollow cylinder, with a first end cap and a second end cap fixed at both ends of the hollow cylinder, and the D-connector, the E-connector and the C-connector are all disposed in the hollow cylinder, and the fifth capillary is fixedly connected to the first end cap.

5. 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 as described in any one of claims 1 to 4, wherein the D-connector of the three-way reversing valve is connected to the outlet pipe of the compressor, the E-connector of the three-way reversing valve is connected to the first condenser, and the C-connector is connected to the second condenser.

6. A refrigeration system comprising a compressor and reheaters connected in series, characterized in that, It also includes the three-way reversing valve as described in any one of claims 1 to 4, and a direct connection pipe connected in parallel with the reheater. The direct connection pipe is provided with a switching valve and a condenser. The D-connector of the three-way reversing valve is connected to the outlet pipe of the compressor. The E-connector of the three-way reversing valve is connected to the inlet of the reheater. The C-connector is connected to the direct connection pipe.

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