Reversing valve and cooling system

Abstract

The utility model discloses a reversing valve and a cooling system.The reversing valve comprises a valve body assembly, a first pilot valve part and a second pilot valve part, the valve body assembly comprises a valve body, a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, and the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are arranged on the valve body; the first pilot valve part and the second pilot valve part are connected to the valve body and used for controlling communication among the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe, so that the reversing valve is provided with a first station, a second station and a third station. When the reversing valve is located at the third station, the cooling system can be in a defrosting state, so that the function of the indoor unit and the function of the outdoor unit do not need to be exchanged, the indoor unit is prevented from being in a short-time refrigeration state, heat supply loss is prevented, and meanwhile the indoor comfort level is kept.

Description

Technical Field

[0001] This application relates to the field of cooling technology, and particularly to a reversing valve and a cooling system including the reversing valve. Background Art

[0002] The existing four-way reversing valve has only two working positions. When the air conditioner is in the cooling state during use, the coil is powered off, the D connection pipe of the four-way reversing valve communicates with the C connection pipe, and the E connection pipe communicates with the S connection pipe. At this time, the four-way reversing valve is in the first working position; when the air conditioner is in the heating state, the coil is powered on, the D connection pipe communicates with the E connection pipe, and the C connection pipe communicates with the S connection pipe. At this time, the four-way reversing valve is in the second working position.

[0003] However, when the air conditioner is in the heating state, the outdoor evaporator will frost because it is in a low temperature state for a long time. Therefore, it is necessary to reverse the four-way valve. At this time, it is necessary to interchange the functions of the indoor unit and the outdoor unit, so that the indoor unit is in a short-term cooling state, resulting in a loss of heat supply and poor indoor comfort. Utility Model Content

[0004] In order to overcome the problems existing in the above-mentioned prior art, the main purpose of this application is to provide a four-way valve that can defrost the outdoor unit without changing the indoor heating state.

[0005] In order to achieve the above purpose, this application specifically adopts the following technical solutions:

[0006] This application provides a reversing valve, which includes:

[0007] A valve body assembly, which includes a valve body, a first connection pipe, a second connection pipe, a third connection pipe, and a fourth connection pipe. The first connection pipe, the second connection pipe, the third connection pipe, and the fourth connection pipe are respectively arranged on the valve body;

[0008] A first pilot valve part and a second pilot valve part, which are respectively connected to the valve body and used to control the communication between the first connection pipe, the second connection pipe, the third connection pipe, and the fourth connection pipe, so that the reversing valve has a first working position, a second working position, and a third working position;

[0009] When the reversing valve is in the first working position, the first connection pipe communicates with the fourth connection pipe, and the second connection pipe communicates with the third connection pipe; when the reversing valve is in the second working position, the first connection pipe communicates with the second connection pipe, and the third connection pipe communicates with the fourth connection pipe; when the reversing valve is in the third working position, the first connection pipe communicates with the fourth connection pipe, and the second connection pipe and the third connection pipe respectively form independent flow channels.

[0010] In some embodiments, the valve body assembly further includes a valve seat and a slider. The valve body is provided with an installation cavity, the valve seat is arranged in the installation cavity, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are respectively arranged on the valve seat, the slider is slidably arranged on the valve seat, and the first pilot valve portion and the second pilot valve portion are used to drive the slider to move so as to control the communication among the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe.

[0011] In some embodiments, the slider includes an inner cavity, the width of the inner cavity is W1, the distance between the second connecting pipe and the fourth connecting pipe is W2, and W1 < W2.

[0012] In some embodiments, the slider further includes a first sliding portion, the length of the first sliding portion is W3, the inner diameter of the second connecting pipe is D1, and W2 > D1.

[0013] In some embodiments, when the reversing valve is in the first working position, the second connecting pipe communicates with the third connecting pipe through the inner cavity, and the first connecting pipe communicates with the fourth connecting pipe through the installation cavity. When the reversing valve is in the second working position, the first connecting pipe communicates with the second connecting pipe through the installation cavity, and the third connecting pipe communicates with the fourth connecting pipe through the inner cavity. When the reversing valve is in the third working position, the first sliding portion covers the second connecting pipe, the third connecting pipe communicates with the inner cavity, and the fourth connecting pipe communicates with the first connecting pipe through the installation cavity.

[0014] In some embodiments, the valve body assembly further includes a first piston module, a second piston module and a separator. The first piston module, the second piston module and the separator are respectively slidably arranged in the installation cavity, so that the installation cavity is divided into a first cavity, a second cavity, a third cavity and a fourth cavity. The valve seat and the slider are respectively arranged in the third cavity. The first pilot valve portion is used to change the pressure difference between the second cavity and the fourth cavity, and the second pilot valve portion is used to change the pressure of the first cavity to drive the moving directions of the slider and the separator.

[0015] In some embodiments, the first pilot valve portion is connected to the second cavity, the fourth cavity, the first connecting pipe and the third connecting pipe, and the second pilot valve portion is connected to the first cavity, the second cavity and the third connecting pipe. The pressure difference between the second cavity and the fourth cavity is changed through the first pilot valve portion and the second pilot valve portion.

[0016] In some embodiments, the first pilot valve portion includes a first coil, and the second pilot valve portion includes a second coil. By controlling the energized or de-energized state of the first coil, the pressures of the first cavity, the second cavity and the fourth cavity are changed.

[0017] Accordingly, the present application further provides a cooling system, which includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, and a reversing valve as described in any of the above embodiments. The second connection pipe of the reversing valve is connected to one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected to one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger is connected to the fourth connection pipe of the reversing valve, the input end of the compressor is connected to the third connection pipe of the reversing valve, the output end of the compressor is connected to the first connection pipe of the reversing valve, and the pipeline between the indoor heat exchanger and the outdoor heat exchanger is also connected to the third connection pipe of the reversing valve.

[0018] In some embodiments, the cooling system further includes a three-way valve, and one end of the indoor heat exchanger, one end of the outdoor heat exchanger, and the third connection pipe of the reversing valve are respectively connected to the three-way valve through pipelines.

[0019] Compared with the prior art, the reversing valve of the present application has three working positions. In the scenario where the reversing valve is applied to a cooling system, when the reversing valve is in the first working position, the cooling system can be in a refrigeration state; when the reversing valve is in the second working position, the cooling system can be in a heating state; when the reversing valve is in the third working position, the cooling system can be in a defrosting state. Thus, it is not necessary to interchange the functions of the indoor unit and the outdoor unit, avoiding making the indoor unit in a short-term refrigeration state, thereby preventing the loss of heat supply, and at the same time maintaining indoor comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 14 is a schematic structural diagram of a prior art cooling system in a refrigeration state.

[0021] Figure 2 FIG. 18 is a schematic structural diagram of a prior art cooling system in a heating state.

[0022] Figure 3 FIG. 22 is a schematic structural diagram of the reversing valve provided by the embodiment of the present application in the first working position.

[0023] Figure 4 FIG. 26 is a schematic structural diagram of the reversing valve provided by the embodiment of the present application in the second working position.

[0024] Figure 5 FIG. 30 is a schematic structural diagram of the reversing valve provided by the embodiment of the present application in the third working position.

[0025] Figures 6(a) to 6(d) FIG. 34 is a schematic structural diagram of the cooperation between the valve seat and the slider in the reversing valve.

[0026] Figure 7Schematic structural diagram of the cooling system provided by the embodiment of the present application in the refrigeration state.

[0027] Figure 8 Schematic structural diagram of the cooling system provided by the embodiment of the present application in the heating state.

[0028] Figure 9 Schematic structural diagram of the cooling system provided by the embodiment of the present application in the defrosting state.

[0029] Reference numerals in the drawings:

[0030] 1. Valve body assembly; 10. Valve body; 101. Installation cavity; 102. First cavity; 103. Second cavity; 104. Third cavity; 105. Fourth cavity; 11. Valve seat; 12. Slide block; 121. Inner cavity; 13. First connecting pipe; 14. Second connecting pipe; 15. Third connecting pipe; 16. Fourth connecting pipe; 17. First piston module; 18. Second piston module; 19. Isolation part; 2. First pilot valve part; 21. First pilot valve sleeve; 22. First pilot valve seat; 23. First pilot valve bowl; 24. First coil; 25. First static iron core; 26. First moving iron core; 27. First reset elastic part; 28. First connecting frame; 3. Second pilot valve part; 31. Second pilot valve sleeve; 32. Second pilot valve seat; 33. Second pilot valve bowl; 34. Second coil; 35. Second static iron core; 36. Second moving iron core; 37. Second reset elastic part; 38. Second connecting frame; 100. Directional control valve; 200. Indoor heat exchanger; 300. Outdoor heat exchanger; 400. Three-way valve; 500. Expansion valve; 600. Compressor; 700. First stop valve; 800. Second stop valve; 100'. Four-way directional control valve; 101'. Main valve of the directional control valve; 102'. Pilot valve of the directional control valve; 103'. Electromagnetic coil; 200'. Compressor; 300'. Indoor heat exchanger; 400'. Outdoor heat exchanger. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] In the description of the present application, unless otherwise clearly specified or limited, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "plural" means two or more, and the term "multiple types" means two or more types; the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] In the description of this specification, it should be understood that the orientation terms such as "upper" and "lower" described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0034] Refer to Figure 1 and Figure 2 as shown Figure 1 is a schematic structural diagram of a prior art cooling system in a refrigeration state, Figure 2 is a schematic structural diagram of a prior art cooling system in a heating state. The cooling system includes a four-way reversing valve 100', a compressor 200', an indoor heat exchanger 300' and an outdoor heat exchanger 400'. Among them, the four-way reversing valve 100' includes an electromagnetic coil 103', a main reversing valve 101' and a pilot reversing valve 102'. The above four-way reversing valve 100' is controlled by the electromagnetic coil 103' and the pilot reversing valve 102' and has only two working positions for realizing the refrigeration and heating of the cooling system. During refrigeration, the electromagnetic coil 103' is de-energized, the D connection pipe of the four-way reversing valve 100' communicates with the C connection pipe, and the outdoor heat exchanger 400' contains high-temperature and high-pressure gas to realize outdoor heating; the E connection pipe of the four-way reversing valve 100' communicates with the S connection pipe, and the indoor heat exchanger 300' contains low-temperature and low-pressure gas to realize indoor refrigeration. During heating, the electromagnetic coil 103' is energized, the D connection pipe of the four-way reversing valve 100' communicates with the E connection pipe, and the indoor heat exchanger 300' contains high-temperature and high-pressure gas to realize indoor heating; the C connection pipe of the four-way reversing valve 100' communicates with the S connection pipe, and the outdoor heat exchanger 400' contains low-temperature and low-pressure gas to realize outdoor refrigeration.

[0035] When the cooling system is in the heating working state for a long time, frosting occurs on the outdoor heat exchanger. At this time, the coil is powered off, the flow path of the four-way reversing valve is switched, the system is switched to the refrigeration cycle, and the outdoor heat exchanger removes frost through high-temperature and high-pressure gas. At the same time, the indoor heat exchanger is in the refrigeration state through low-temperature and low-pressure gas. After the defrosting is completed, the coil is powered on again to achieve the heating cycle. This process will cause loss of indoor heating supply and reduce comfort at the same time.

[0036] Referring to Figures 3 to 5 As shown, the reversing valve includes a valve body assembly 1, a first pilot valve portion 2, and a second pilot valve portion 3. The valve body assembly 1 includes a valve body 10, a first connecting pipe 13, a second connecting pipe 14, a third connecting pipe 15, and a fourth connecting pipe 16. The first connecting pipe 13, the second connecting pipe 14, the third connecting pipe 15, and the fourth connecting pipe 16 are respectively arranged on the valve body 10. The first pilot valve portion 2 and the second pilot valve portion 3 are respectively connected to the valve body 10 and are used to control the communication between the first connecting pipe 13, the second connecting pipe 14, the third connecting pipe 15, and the fourth connecting pipe 16, so that the reversing valve has a first working position, a second working position, and a third working position.

[0037] When the reversing valve is in the first working position, the first connecting pipe 13 is communicated with the fourth connecting pipe 16, and the second connecting pipe 14 is communicated with the third connecting pipe 15; when the reversing valve is in the second working position, the first connecting pipe 13 is communicated with the second connecting pipe 14, and the third connecting pipe 15 is communicated with the fourth connecting pipe 16; when the reversing valve is in the third working position, the first connecting pipe 13 is communicated with the fourth connecting pipe 16, and the second connecting pipe 14 and the third connecting pipe 15 respectively form independent flow paths.

[0038] Furthermore, the valve body assembly 1 further includes a valve seat 11 and a slider 12. The valve body 10 is provided with an installation cavity 101. The valve seat 11 is arranged in the installation cavity 101. The second connecting pipe 14, the third connecting pipe 15, and the fourth connecting pipe 16 are respectively arranged on the valve seat 11. The slider 12 is slidably arranged on the valve seat 11. The first pilot valve portion 2 and the second pilot valve portion 3 are used to drive the slider 12 to move to control the communication between the first connecting pipe 13, the second connecting pipe 14, the third connecting pipe 15, and the fourth connecting pipe 16.

[0039] Specifically, the slider 12 includes an inner cavity 121, a first sliding portion 122, and a second sliding portion 123. When the reversing valve is in the first working position, the inner cavity 121 of the slider 12 partially or completely covers the second connecting pipe 14 and the third connecting pipe 15, so that the second connecting pipe 14 is communicated with the third connecting pipe 15 through the inner cavity 121, and the first connecting pipe 13 is communicated with the fourth connecting pipe 16 through the installation cavity 101. When the reversing valve is in the second working position, the inner cavity 121 of the slider 12 partially or completely covers the third connecting pipe 15 and the fourth connecting pipe 16, so that the first connecting pipe 13 is communicated with the second connecting pipe 14 through the installation cavity 101, and the third connecting pipe 15 is communicated with the fourth connecting pipe 16 through the inner cavity 121. When the reversing valve is in the third working position, the first sliding portion 122 of the slider 12 completely covers the second connecting pipe 14, the inner cavity 121 of the slider 12 completely covers the third connecting pipe 15, the second sliding portion 123 of the slider 12 does not cover the fourth connecting pipe 16, or the second sliding portion 123 of the slider 12 only partially covers the fourth connecting pipe 16, so that the second connecting pipe 14 and the third connecting pipe 15 form a separate flow channel, and the first connecting pipe 13 is communicated with the fourth connecting pipe 16.

[0040] Continue to refer to Figure 3 As shown, the valve body assembly 1 further includes a first piston module 17, a second piston module 18, and a separator 19. The first piston module 17, the second piston module 18, and the separator 19 are respectively slidably disposed in the installation cavity 101, so that the installation cavity 101 is divided into a first cavity 102, a second cavity 103, a third cavity 104, and a fourth cavity 105. The valve seat 11 and the slider 12 are respectively disposed in the third cavity 104. The first pilot valve portion 2 is connected to the second cavity 103, the fourth cavity 105, the first connecting pipe 13, and the third connecting pipe 15 for changing the pressure difference between the second cavity 103 and the fourth cavity 105. The second pilot valve portion 3 is connected to the first cavity 102, the second cavity 103, and the third connecting pipe 15 for changing the pressure of the first cavity 102. Combining the change in the pressure of the second cavity 103 by the first pilot valve portion 2, the pressure difference control between the first cavity 102 and the second cavity 103 is realized to drive the moving directions of the slider 12 and the separator 19.

[0041] Referring to Fig. 6(a), the diameters of the second connecting pipe 14, the third connecting pipe 15, and the fourth connecting pipe 16 are the same, all being D1. The width of the inner cavity 121 of the slider 12 is W1, the width of the first sliding portion 122 of the slider 12 is W3, the width of the second sliding portion 123 of the slider 12 is W4, and the distance between the second connecting pipe 14 and the fourth connecting pipe 16 is W2. W1 < W2 and W3 > D1.

[0042] Referring to Fig. 6(b), when the reversing valve is in the first working position, the positional relationship between the slider 12 and the valve seat 11 is: L21 = L2 + D1 or L21 ≈ L2 + D1, L23 < 3*L2 / 2, enabling the second connecting pipe 14 and the third connecting pipe 15 to form a flow channel through the inner cavity 121 of the slider 12, and the flow resistance is small. When △L is close to or equal to 0, the flow resistance is small; at least more than half of the fourth connecting pipe 16 is not covered by the second sliding part of the slider 12, so that the fourth connecting pipe 16 forms a flow channel with the first connecting pipe 13 through the installation cavity 101 of the valve body 10. Among them, L21 is the length of the inner cavity 121 of the slider 12; L22 is the length from the left end face of the slider 12 to the center of the inner cavity 121; L23 is the length from the right end face of the slider 12 to the center of the inner cavity 121; C1 is the chamfer of the slider 12; D1 is the diameter of each connecting pipe; L2 is the distance between the two connecting pipes of the valve seat 11, that is, the reversing stroke of the slider 12; C2 is the chamfer of the valve seat 11.

[0043] Referring to Fig. 6(c), when the reversing valve is in the second working position, the positional relationship between the slider 12 and the valve seat 11 is: L21 = L2 + D1 or L21 ≈ L2 + D1, L22 < 3*L2 / 2, enabling the third connecting pipe 15 and the fourth connecting pipe 16 to form a flow channel, and the flow resistance is small. When △L is close to or equal to 0, the flow resistance is small; at least more than half of the second connecting pipe 14 is not covered by the first sliding part of the slider 12, so that the second connecting pipe 14 forms a flow channel with the first connecting pipe 13 through the installation cavity 101 of the valve body 10.

[0044] Referring to Fig. 6(d), when the reversing valve is in the third working position, the positional relationship between the slider 12 and the valve seat 11 is: L21 + 2*C1 < 2*L2 - D1 - 2*C2, L22 > L2 + D1 / 2, L23 < L2, enabling the second connecting pipe 14 and the third connecting pipe 15 to form separate cavities respectively, and at least more than half of the fourth connecting pipe 16 is not covered by the second sliding part of the slider 12, so that the fourth connecting pipe 16 forms a flow channel with the first connecting pipe 13 through the installation cavity 101 of the valve body 10.

[0045] Continue to refer to Figure 3 As shown, the first pilot valve part 2 includes a first driving part, a first pilot valve sleeve 21 with a first sleeve cavity, a first pilot valve seat 22 and a first pilot valve bowl 23; the first pilot valve seat 22 and the first pilot valve bowl 23 are located in the first sleeve cavity, and the first pilot valve seat 22 has a first connection port, a second connection port and a third connection port. The first pilot valve bowl 23 is pressed and fitted with the first pilot valve seat 22. Driven by the first driving part, the first pilot valve bowl 23 can slide along the first pilot valve seat 22 to switch between different working positions, and is configured such that when in the first state, the first connection port is communicated with the second connection port through the inner cavity 121 of the first pilot valve bowl 23, and the third connection port is communicated with the first sleeve cavity; when the reversing valve is in the second state, the first connection port is communicated with the first sleeve cavity, and the second connection port and the third connection port are communicated through the inner cavity 121 of the first pilot valve bowl 23.

[0046] Further, the first driving part includes a first coil 24, a first static iron core 25, a first moving iron core 26, a first reset elastic member 27 and a first connecting frame 28. Among them, the first reset elastic member 27 is arranged between the first static iron core 25 and the first moving iron core 26, and the first connecting frame 28 is connected between the first moving iron core 26 and the first guide valve bowl 23. By energizing and de-energizing the first coil 24 and combining with the first reset elastic member 27, the first moving iron core 26 is controlled to drive the first connecting frame 28 to act, so as to drive the first guide valve bowl 23 to slide, thereby controlling the communication state between each interface, and further controlling the pressure difference between the second cavity 103 and the fourth cavity 105 of the valve body.

[0047] During specific implementation, when the first guide valve part 2 is in the power-off state and in the first state, at this time, the second cavity 103 of the valve body is communicated with the third connecting pipe 15 through the capillary e1, the first connecting port, the second connecting port and the capillary s1, and the second cavity 103 is in a low-pressure state. The fourth cavity 105 of the valve body is communicated with the first connecting pipe 13 through the capillary c1, the third connecting port, the first sleeve cavity and the capillary d1, and the fourth cavity 105 is in a high-pressure state. When the first guide valve part 2 is in the powered-on state and in the second state, at this time, the second cavity 103 of the valve body is communicated with the first connecting pipe 13 through the capillary e1, the first connecting port, the first sleeve cavity and the capillary d1, and the second cavity 103 is in a high-pressure state. The fourth cavity 105 of the valve body is communicated with the third connecting pipe 15 through the capillary c1, the third connecting port, the second connecting port and the capillary s1, and the fourth cavity 105 is in a low-pressure state.

[0048] Further, the second guide valve part 3 includes a second driving part, a second guide valve sleeve 31 with a second sleeve cavity, a second guide valve seat 32 and a second guide valve bowl 33. The second guide valve seat 32 and the second guide valve bowl 33 are located in the second sleeve cavity, and the second guide valve seat 32 has a third interface and a fourth interface. The second guide valve bowl 33 is pressed and fitted with the second guide valve seat 32. Driven by the second driving part, the second guide valve bowl 33 can slide along the second guide valve seat 32 to switch between various states, and is configured such that when in the third state, the third interface and the fourth interface are communicated through the inner cavity of the second guide valve bowl 33; when in the fourth state, the third interface is communicated with the second sleeve cavity, and the fourth interface is communicated with the inner cavity of the second guide valve bowl 33.

[0049] The second driving part includes a second coil 34, a second static iron core 35, a second moving iron core 36, a second reset elastic member 37 and a second connecting frame 38. Among them, the second reset elastic member 37 is arranged between the second static iron core 35 and the second moving iron core 36, and the second connecting frame 38 is connected between the second moving iron core 36 and the second pilot valve bowl 33. By energizing and de-energizing the second coil 34, combined with the second reset elastic member 37, the second moving iron core 36 is controlled to drive the second connecting frame 38 to act, so as to drive the second pilot valve bowl 33 to slide, thereby controlling the communication state between the interfaces, and further controlling the pressure state in the first cavity 102 of the valve body.

[0050] During specific implementation, when the second coil 34 of the second pilot valve part 3 is in the energized state, the second moving iron core 36 is attracted to the second static iron core 35, driving the second pilot valve bowl 33 to slide towards the direction close to the second static iron core 35. The second reset elastic member 37 is compressed to store deformation energy. The inner cavity of the second pilot valve bowl 33 communicates with the third interface and the fourth interface of the second pilot valve seat 32, and the second pilot valve part 3 is in the third state. At this time, the first cavity 102 of the valve body communicates with the third connecting pipe 15 through the third interface, the fourth interface and the capillary s2, and the first cavity 102 is in a low-pressure state. When the second coil 34 of the second pilot valve part 3 is in the de-energized state, under the elastic force of the second reset elastic member 37, the second moving iron core 36 drives the second pilot valve bowl 33 to slide away from the second static iron core 35. The third interface communicates with the second sleeve cavity, and the fourth interface communicates with the inner cavity of the second pilot valve bowl 33. The second pilot valve part 3 is in the fourth state. At this time, the first cavity 102 of the valve body communicates with the first connecting pipe through the third interface, the second sleeve cavity and the capillary d2, and the first cavity 102 is in a high-pressure state.

[0051] The above-mentioned reversing valve can be used in systems such as air conditioners, compressors, refrigerators and water heaters.

[0052] Correspondingly, the present application also discloses a cooling system. Referring to Figure 7 As shown, the cooling system includes an indoor heat exchanger 200, an outdoor heat exchanger 300, a three-way valve 400, an expansion valve 500, a compressor 300, a first stop valve 700, a second stop valve 800 and the reversing valve 100 described in any of the above embodiments, which are connected together through pipelines. One end of the indoor heat exchanger 200 is connected to the second connecting pipe E of the reversing valve 100, and the other end of the indoor heat exchanger 200 is sequentially connected to one end of the outdoor heat exchanger 300 through the three-way valve 400 and the expansion valve 500. The other end of the outdoor heat exchanger 300 is connected to the fourth connecting pipe C of the reversing valve 100. The input end of the compressor 600 is connected to the third connecting pipe S of the reversing valve 100 through the first stop valve 700, and the output end of the compressor 600 is connected to the first connecting pipe D of the reversing valve 100 through the second stop valve 800, and the third connecting pipe S of the reversing valve 100 is also connected to the three-way valve 400.

[0053] When the cooling system is in the refrigeration mode, the first connection pipe D and the fourth connection pipe C of the reversing valve 100 are connected to form a flow path; the second connection pipe E and the third connection pipe S are connected to form another flow path. At this time, the refrigerant flow path in the system is as follows: The refrigerant is output from the output end of the compressor 600, and successively passes through the second stop valve 800, the first connection pipe D of the reversing valve 100, and the fourth connection pipe C and flows into the outdoor heat exchanger 300, where it releases heat; the refrigerant flowing out of the outdoor heat exchanger 300 successively passes through the expansion valve 500 and the three-way valve 400 and flows into the indoor heat exchanger 200, where it absorbs heat to achieve refrigeration, and then the refrigerant flowing out of the indoor heat exchanger 200 successively passes through the second connection pipe E, the third connection pipe S of the reversing valve 100 and the first stop valve 700 and flows into the compressor 600.

[0054] Refer to Figure 8 As shown in the figure, when the cooling system is in the heating mode, the first connection pipe D and the second connection pipe E of the reversing valve 100 are connected to form a flow path; the third connection pipe S and the fourth connection pipe C are connected to form another flow path. At this time, the refrigerant flow path in the system is as follows: The refrigerant is output from the output end of the compressor 600, and successively passes through the second stop valve 800, the first connection pipe D of the reversing valve 100, and the second connection pipe E and flows into the indoor heat exchanger 200, where it releases heat to achieve heating; then the refrigerant flowing out of the indoor heat exchanger 200 successively passes through the three-way valve 400 and the expansion valve 500 and flows into the outdoor heat exchanger 300, where it releases heat, and finally the refrigerant flowing out of the outdoor heat exchanger 300 successively passes through the fourth connection pipe C, the third connection pipe S of the reversing valve 100 and the first stop valve 700 and flows into the compressor 600.

[0055] Refer to Figure 9 As shown in the figure, when the cooling system is in the defrosting mode, the first connection pipe D and the fourth connection pipe C of the reversing valve 100 are connected to form a flow path; the second connection pipe E and the third connection pipe S respectively form separate flow paths. At this time, the refrigerant flow path in the system is as follows: The refrigerant is output from the output end of the compressor 600, and successively passes through the second stop valve 800, the first connection pipe D of the reversing valve 100, and the fourth connection pipe C and flows into the outdoor heat exchanger 300, where it releases heat to achieve the defrosting function; the refrigerant flowing out of the outdoor heat exchanger 300 successively passes through the expansion valve 500 and the three-way valve 400 and flows to the third connection pipe S of the reversing valve 100, and then flows into the compressor 600 through the first stop valve 700. Because the interface Y and the interface Z of the three-way valve 400 are connected and the interface X is cut off, the second connection pipe E of the reversing valve 100 and the X interface of the three-way valve 400 form a cut-off flow path, and the high-temperature and high-pressure refrigerant retained in the indoor heat exchanger 200 during the heating mode does not flow.

[0056] As described above, it is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A reversing valve, characterized in that, Comprising: A valve body assembly, the valve body assembly includes a valve body, a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are respectively arranged on the valve body; A first pilot valve part and a second pilot valve part, the first pilot valve part and the second pilot valve part are respectively connected to the valve body, and are used to control the communication between the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe, so that the reversing valve has a first working position, a second working position and a third working position; When the reversing valve is in the first working position, the first connecting pipe is communicated with the fourth connecting pipe, and the second connecting pipe is communicated with the third connecting pipe; when the reversing valve is in the second working position, the first connecting pipe is communicated with the second connecting pipe, and the third connecting pipe is communicated with the fourth connecting pipe; when the reversing valve is in the third working position, the first connecting pipe is communicated with the fourth connecting pipe, and the second connecting pipe and the third connecting pipe respectively form independent flow channels.

2. The directional control valve according to claim 1, characterized in that, The valve body assembly further includes a valve seat and a slider, the valve body is provided with an installation cavity, the valve seat is arranged in the installation cavity, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are respectively arranged on the valve seat, the slider is slidably arranged on the valve seat, and the first pilot valve part and the second pilot valve part are used to drive the slider to move to control the communication between the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe.

3. The reversing valve according to claim 2, characterized in that, The slider includes an inner cavity, the width of the inner cavity is W1, the distance between the second connecting pipe and the fourth connecting pipe is W2, and W1 < W2.

4. The reversing valve according to claim 3, characterized in that, The slider further includes a first sliding part, the length of the first sliding part is W3, the diameter of the second connecting pipe is D1, and W2 > D1.

5. The reversing valve according to claim 4, characterized in that, When the reversing valve is in the first working position, the second connecting pipe is communicated with the third connecting pipe through the inner cavity, and the first connecting pipe is communicated with the fourth connecting pipe through the installation cavity; when the reversing valve is in the second working position, the first connecting pipe is communicated with the second connecting pipe through the installation cavity, and the third connecting pipe is communicated with the fourth connecting pipe through the inner cavity; when the reversing valve is in the third working position, the first sliding part covers the second connecting pipe, the third connecting pipe is communicated with the inner cavity, and the fourth connecting pipe is communicated with the first connecting pipe through the installation cavity.

6. The directional control valve according to claim 2, wherein The valve body assembly further includes a first piston module, a second piston module and a separator, the first piston module, the second piston module and the separator are respectively slidably arranged in the installation cavity, so that the installation cavity is divided into a first cavity, a second cavity, a third cavity and a fourth cavity, the valve seat and the slider are respectively arranged in the third cavity, the first pilot valve part is used to change the pressure difference between the second cavity and the fourth cavity, and the second pilot valve part is used to change the pressure of the first cavity to drive the moving directions of the slider and the separator.

7. The reversing valve according to claim 6, characterized in that, The first pilot valve part is connected to the second cavity, the fourth cavity, the first connecting pipe and the third connecting pipe, and the second pilot valve part is connected to the first cavity, the second cavity and the third connecting pipe. The pressure difference between the second cavity and the fourth cavity is changed by the first pilot valve part and the second pilot valve part.

8. The reversing valve according to claim 7, characterized in that, The first pilot valve part includes a first coil, and the second pilot valve part includes a second coil. The pressure of the first cavity, the second cavity and the fourth cavity is changed by controlling the energized or de-energized state of the first coil.

9. A cooling system, characterized in that, It includes an indoor heat exchanger, an outdoor heat exchanger, a compressor and a reversing valve according to any one of claims 1 to 8. The second connecting pipe of the reversing valve is connected to one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected to one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger is connected to the fourth connecting pipe of the reversing valve, the input end of the compressor is connected to the third connecting pipe of the reversing valve, the output end of the compressor is connected to the first connecting pipe of the reversing valve, and the pipeline between the indoor heat exchanger and the outdoor heat exchanger is also connected to the third connecting pipe of the reversing valve.

10. The cooling system according to claim 9, characterized in that, The cooling system further includes a three-way valve. One end of the indoor heat exchanger, one end of the outdoor heat exchanger and the third connecting pipe of the reversing valve are respectively connected to the three-way valve through pipelines.

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