Fluid control valve and refrigerating system

Abstract

The utility model discloses a fluid control valve and a refrigerating system. The fluid control valve comprises a valve body and a piston assembly. The valve body comprises an inner cavity with a first valve port and a second valve port, and the valve body is further provided with a first opening, a second opening and a third opening which are communicated with the inner cavity; the first opening, the first valve port, the second opening, the second valve port and the third opening are sequentially arranged in the axial direction of the valve body. The piston assembly is movably arranged in the inner cavity of the valve body and used for blocking the first valve port and / or the second valve port. When the fluid pressure in the first opening is larger than that in the third opening, the piston assembly is driven by the fluid pressure difference to open the first valve port, the first opening communicates with the second opening, and the piston assembly blocks the second valve port; when the fluid pressure in the third opening is larger than that in the first opening, the piston assembly is driven by the fluid pressure difference to open the second valve port, the second opening communicates with the third opening, and the piston assembly blocks the first valve port.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a fluid control valve and a refrigeration system including the fluid control valve. Background Art

[0002] In the field of fluid control, two valves are typically required to circulate fluid through two flow paths. One valve is placed in one flow path, and the other valve is placed in the other flow path. By controlling the opening or closing of the two valves separately, the fluid circulates through the two flow paths. However, installing two valves in two systems increases both system size and cost. Utility Model Content

[0003] The embodiments of the present application provide a fluid control valve and a refrigeration system to solve the problems of large size and high cost in the related art.

[0004] The fluid control valve of the embodiment of the present application includes:

[0005] A valve body comprising an inner cavity having a first valve port and a second valve port, the valve body further comprising a first opening, a second opening, and a third opening communicating with the inner cavity; the first opening, the first valve port, the second opening, the second valve port, and the third opening being arranged in sequence along the axial direction of the valve body;

[0006] a piston assembly, movably disposed in the inner cavity of the valve body, for blocking the first valve port and / or the second valve port;

[0007] In which, the driving force of the piston assembly is the fluid pressure difference. When the fluid pressure in the first opening is greater than the fluid pressure in the third opening, the piston assembly is driven by the fluid pressure difference to open the first valve port, the first opening is connected to the second opening, and the piston assembly blocks the second valve port; when the fluid pressure in the third opening is greater than the fluid pressure in the first opening, the piston assembly is driven by the fluid pressure difference to open the second valve port, the second opening is connected to the third opening, and the piston assembly blocks the first valve port.

[0008] According to some embodiments of the present application, the further comprising:

[0009] The elastic component is used to keep the piston component in a balanced state; wherein the balanced state means that the piston component remains stationary relative to the valve body in the absence of fluid impact.

[0010] According to some embodiments of the present application, the elastic component includes a first elastic member and a second elastic member, and the first elastic member and the second elastic member are respectively located at the two ends of the piston assembly along the axial direction of the valve body, the first elastic member is used to provide the piston assembly with a first elastic force to move in the direction of blocking the second valve port, and the second elastic member is used to provide the piston assembly with a second elastic force to move in the direction of blocking the first valve port; when the piston assembly is in a balanced state, the first valve port and the second valve port are both in an open state.

[0011] According to some embodiments of the present application, the piston assembly includes a first piston and a second piston arranged opposite to each other along the axial direction of the valve body, the first piston is used to block the first valve port, and the second piston is used to block the second valve port;

[0012] The elastic component is arranged between the first piston and the second piston, and is used to provide an elastic force to the first piston and the second piston to move away from each other. When the piston component is in a balanced state, the first valve port and the second valve port are both in a closed state.

[0013] According to some embodiments of the present application, the first piston has a first groove on a side facing the second piston, and one end of the elastic component is located in the first groove and abuts against the bottom surface of the first groove;

[0014] The second piston has a second groove on a side facing the first piston. The other end of the elastic component is located in the second groove and abuts against the bottom surface of the second groove.

[0015] According to some embodiments of the present application, the piston assembly is movably connected to the valve body through a guide structure; the guide structure includes a guide column and a guide hole, the guide column is integrally connected to the piston assembly, the guide hole is provided in the valve body, the guide column is passed through the guide hole, and the outer surface of the guide column is guided and matched with the hole wall surface of the guide hole.

[0016] According to some embodiments of the present application, a guide portion is convexly provided on the inner wall surface of the valve body, and the guide portion has the guide hole.

[0017] According to some embodiments of the present application, the piston assembly has a first sealing member that seals with the first valve port, and a second sealing member that seals with the second valve port;

[0018] The inner cavity is provided with a first stop portion and a second stop portion; when the first seal is compressed to a first preset deformation amount by the first valve port, the first stop portion abuts against the piston assembly; when the second seal is compressed to a second preset deformation amount by the second valve port, the second stop portion abuts against the piston assembly.

[0019] The refrigeration system of the embodiment of the present application includes:

[0020] a device having an inlet and an outlet, wherein a pressure of a fluid flowing out of the device through the outlet is greater than a pressure of a fluid flowing into the device through the inlet;

[0021] A first fluid control valve, which is any one of the fluid control valves described above, wherein the second opening of the first fluid control valve is in communication with the inlet;

[0022] a first heat exchanger and a second heat exchanger;

[0023] Wherein, the device has a first operating condition and a second operating condition;

[0024] In the second working condition, the outlet of the device is connected to the first opening of the first fluid control valve through the first heat exchanger and the second heat exchanger, and the piston assembly of the first fluid control valve is driven by the fluid pressure difference to switch the first fluid control valve to connect the first opening and the second opening;

[0025] In the first operating condition, the outlet is connected to the third opening of the first fluid control valve through the second heat exchanger and the first heat exchanger, and the piston assembly of the first fluid control valve is driven by the fluid pressure difference to switch the first fluid control valve to connect the third opening and the second opening.

[0026] According to some embodiments of the present application, a first pipeline is provided between the device and the first heat exchanger, a second pipeline is provided between the device and the second heat exchanger, a third pipeline is provided between the first pipeline and the second pipeline, and the first fluid control valve is located in the third pipeline.

[0027] According to some embodiments of the present application, the further comprising:

[0028] The second fluid control valve is any one of the fluid control valves described above;

[0029] a third heat exchanger, wherein the second opening of the second fluid control valve is in communication with the inlet of the device through the third heat exchanger;

[0030] Wherein, in the second operating condition, the outlet of the equipment is connected to the third opening of the second fluid control valve through the first heat exchanger, and the piston assembly of the second fluid control valve is driven by the fluid pressure difference to switch the second fluid control valve to the third opening to communicate with the second opening;

[0031] In the first working condition, the outlet of the equipment is connected to the first opening of the second fluid control valve through the second heat exchanger, and the piston assembly of the second fluid control valve is driven by the fluid pressure difference to switch the second fluid control valve to connect the first opening and the second opening.

[0032] According to some embodiments of the present application, a fourth pipeline is provided between the second heat exchanger and the first heat exchanger, and the second fluid control valve is located in the fourth pipeline;

[0033] The refrigeration system further includes a fifth pipe, one end of which is connected to the fourth pipe between the second heat exchanger and the second fluid control valve, and the other end of which is connected to the fourth pipe between the first heat exchanger and the second fluid control valve.

[0034] One embodiment of the above application has at least the following advantages or beneficial effects:

[0035] In the fluid control valve of the embodiment of the present application, the piston assembly is driven by the fluid pressure difference and can move within the valve body. When the fluid pressure of the first opening is greater than the fluid pressure of the third opening, the piston assembly is driven by the fluid pressure difference to open the first valve port, the first opening is connected to the second opening, and the piston assembly blocks the second valve port; when the fluid pressure of the third opening is greater than the fluid pressure of the first opening, the piston assembly is driven by the fluid pressure difference to open the second valve port, the third opening is connected to the second opening, and the piston assembly blocks the first valve port. In this way, the effect of switching the flow path is achieved. Compared with the design of using two valves in the related art, the embodiment of the present application uses a single fluid control valve to complete the flow path switching, which reduces the volume and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a schematic top view of a fluid control valve according to the first embodiment of the present application.

[0037] Figure 2 Shown is a three-dimensional schematic diagram of the fluid control valve of the first embodiment of the present application at one viewing angle.

[0038] Figure 3 Shown is a three-dimensional schematic diagram of the fluid control valve of the first embodiment of the present application from another perspective.

[0039] Figure 4 Shown is the Figure 1Sectional view along the AA cutting line.

[0040] Figure 5 Shown is a cross-sectional view of a fluid control valve according to a second embodiment of the present application.

[0041] Figure 6 Shown is a flow chart of the refrigeration system in the refrigeration mode according to an embodiment of the present application.

[0042] Figure 7 Shown is a flow chart of the refrigeration system in the heating mode according to the embodiment of the present application.

[0043] Figure 8 Shown is a flow chart of a refrigeration system according to an embodiment of the present application in which the first sub-heat exchanger is in a heat dissipation mode.

[0044] Figure 9 Shown is a flow chart of a refrigeration system according to an embodiment of the present application in which the first sub-heat exchanger is in a heat energy recovery mode.

[0045] Figure 10 Shown is a flow chart of the second sub-heat exchanger of the refrigeration system according to an embodiment of the present application in a heat dissipation mode.

[0046] Figure 11 Shown is a flow chart of the second sub-heat exchanger of the refrigeration system according to an embodiment of the present application in a heat energy recovery mode.

[0047] The description of the accompanying drawings is as follows:

[0048] 10. Equipment; 11. Import; 12. Export;

[0049] 20a, first fluid control valve; 20b, second fluid control valve;

[0050] 31. First heat exchanger; 32. Second heat exchanger;

[0051] 41. First sub-heat exchanger; 42. Second sub-heat exchanger;

[0052] 50, three-way valve; 51, inlet; 52, first outlet; 53, second outlet;

[0053] 60. Gas-liquid separator;

[0054] 71. First expansion valve; 72. Second expansion valve; 73. Third expansion valve;

[0055] 100, valve body; 101, first valve port; 102, second valve port; 103, first opening; 104, second opening; 105, third opening; 110, inner cavity; 121, first stopper; 122, second stopper; 130, first valve sleeve; 140, second valve sleeve; 150, valve cap;

[0056] 200, piston assembly; 201, first sealing member; 202, second sealing member; 210, first piston; 211, first groove; 220, second piston; 221, second groove;

[0057] 300, elastic component; 310, first elastic member; 320, second elastic member;

[0058] 400. Guide structure; 410. Guide column; 420. Guide hole. DETAILED DESCRIPTION

[0059] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0060] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0061] [Fluid Control Valve of the First Embodiment]

[0062] like Figures 1 to 4As shown, the fluid control valve of the first embodiment of the present application includes a valve body 100, a piston assembly 200, and an elastic assembly 300. The valve body 100 includes an inner cavity 110 having a first valve port 101 and a second valve port 102. The valve body 100 also has a first opening 103, a second opening 104, and a third opening 105 communicating with the inner cavity 110. Along the axial direction of the valve body 100, the first opening 103, the first valve port 101, the second opening 104, the second valve port 102, and the third opening 105 are arranged in sequence. The piston assembly 200 is movably disposed in the inner cavity 110 of the valve body 100 to block the first valve port 101 and / or the second valve port 102. The elastic assembly 300 is used to maintain the piston assembly 200 in a balanced state. The balanced state means that in the absence of fluid impact, the piston assembly 200 remains stationary relative to the valve body 100. When the pressure of the fluid flowing into the inner cavity 110 from the first opening 103 is greater than the pressure of the fluid flowing into the inner cavity 110 from the third opening 105, the piston assembly 200 is driven by the fluid pressure difference to block the second valve port 102 and open the first valve port 101, and the first opening 103 is connected with the second opening 104; when the pressure of the fluid flowing into the inner cavity 110 from the third opening 105 is greater than the pressure of the fluid flowing into the inner cavity 110 from the first opening 103, the piston assembly 200 is driven by the fluid pressure difference to block the first valve port 101 and open the second valve port 102, and the second opening 104 is connected with the third opening 105.

[0063] When the piston assembly 200 opens the first valve port 101, the fluid pressure in the first opening 103 is simultaneously greater than the fluid pressure in the second opening 104. When the piston assembly 200 opens the second valve port 102, the fluid pressure in the third opening 105 is simultaneously greater than the fluid pressure in the second opening 104. Preferably, the first opening 103 and the third opening 105 serve as fluid inlets, and the second opening 104 serves as a fluid outlet.

[0064] In the fluid control valve of the embodiment of the present application, the piston assembly 200 is driven by the fluid pressure difference and can move in the valve body 100. When the fluid pressure of the first opening 103 is greater than the fluid pressure of the third opening 105, the piston assembly 200 is driven by the fluid pressure difference to block the second valve port 102 and open the first valve port 101, so that the first opening 103 is connected to the second opening 104; when the fluid pressure of the third opening 105 is greater than the fluid pressure of the first opening 103, the piston assembly 200 is driven by the fluid pressure difference to block the first valve port 101 and open the second valve port 102, so that the third opening 105 is connected to the second opening 104. In this way, the effect of switching the flow path is achieved. Compared with the design of using two one-way valves in the related art, the embodiment of the present application uses a fluid control valve to complete the flow path switching only by the fluid pressure difference, which not only reduces the volume but also saves costs, and does not require other driving mechanisms.

[0065] like Figures 2 to 4As shown, the valve body 100 may include a first valve sleeve 130, a second valve sleeve 140, and a valve bonnet 150. The valve bonnet 150, the second valve sleeve 140, and the first valve sleeve 130 are arranged in sequence along the axial direction of the valve body 100. The valve bonnet 150 is fixedly connected to the second valve sleeve 140, and the second valve sleeve 140 is fixedly connected to the first valve sleeve 130. The valve bonnet 150 and the second valve sleeve 140, and the second valve sleeve 140 and the first valve sleeve 130, may be connected by welding, interference fit, or the valve bonnet 150 and the second valve sleeve 140 may be integrally formed, which is not particularly limited in this application.

[0066] In one embodiment, the valve cap 150 has a first opening 103 , the second valve sleeve 140 has a first valve port 101 , and the first valve sleeve 130 has a second valve port 102 , a second opening 104 , and a third opening 105 .

[0067] Of course, in other embodiments, the valve body 100 may also include a valve cap 150 and a valve sleeve, wherein the valve cap 150 is connected to the valve sleeve. The valve cap 150 may have a first opening 103, and the valve sleeve may have a first valve port 101, a second valve port 102, a second opening 104, and a third opening 105.

[0068] like Figure 4 As shown, the second opening 104 is located between the first valve port 101 and the second valve port 102 , the first valve port 101 is located between the first opening 103 and the second opening 104 , and the second valve port 102 is located between the second opening 104 and the third opening 105 .

[0069] like Figure 4 As shown, the elastic component 300 includes a first elastic member 310 and a second elastic member 320. The first elastic member 310 and the second elastic member 320 are respectively located at the two ends of the piston component 200 along the axial direction of the valve body 100. The first elastic member 310 is used to provide the piston component 200 with a first elastic force to move in the direction of blocking the second valve port 102, and the second elastic member 320 is used to provide the piston component 200 with a second elastic force to move in the direction of blocking the first valve port 101.

[0070] When the fluid pressure at the first opening 103 is greater than the fluid pressure at the third opening 105, the piston assembly 200 is driven by the fluid pressure differential to move in the direction of blocking the second valve port 102. During the movement of the piston assembly 200, the second elastic member 320 is squeezed by the piston assembly 200, resulting in an increased compression, while the first elastic member 310 is reduced in compression.

[0071] When the fluid pressure at the third opening 105 is greater than the fluid pressure at the first opening 103, the piston assembly 200 is driven by the fluid pressure differential to move in a direction to block the first valve port 101. During the movement of the piston assembly 200, the first elastic member 310 is squeezed by the piston assembly 200, resulting in an increased compression, while the second elastic member 320 is reduced in compression.

[0072] It can be understood that when the piston assembly 200 is in a balanced state, the first valve port 101 and the second valve port 102 are both in an open state.

[0073] like Figure 4 As shown, the piston assembly 200 is movably connected to the valve body 100 via a guide structure 400. In the embodiment of the present application, the guide structure 400 is used to guide the piston assembly 200 to move along the axial direction of the valve body 100, thereby preventing the piston assembly 200 from moving in a skewed manner and affecting the sealing performance of the piston assembly 200 in blocking the first valve port 101 or the second valve port 102.

[0074] As an example, both ends of the piston assembly 200 along the axial direction of the valve body 100 are movably connected to the valve body 100 through a guide structure 400 .

[0075] In one embodiment, the guide structure 400 may include a guide column 410 and a guide hole 420. The guide column 410 is integrally connected to the piston assembly 200, the guide hole 420 is provided in the valve body 100, the guide column 410 is passed through the guide hole 420, and the outer surface of the guide column 410 is guided and matched with the hole wall surface of the guide hole 420.

[0076] As an example, a guide portion 120 is protruded from the inner wall surface of the valve body 100 , and the guide portion 120 has a guide hole 420 .

[0077] like Figure 4 As shown, in this embodiment of the present application, the piston assembly 200 is provided with a guide post 410 at each axial end of the valve body 100, with the axes of the two guide posts 410 coinciding. The valve body 100 is provided with two guide portions 120, which are spaced apart along the axial direction of the valve body 100. The two guide posts 410 are respectively guided and engaged with the guide holes 420 of the two guide portions 120.

[0078] In one embodiment, a first stopper 121 and a second stopper 122 are convexly formed on the inner wall of the valve body 100. The first stopper 121 and the second stopper 122 are spaced apart along the movement direction of the piston assembly, and the piston assembly is located between the first stopper 121 and the second stopper 122. In this embodiment of the present application, the first stopper 121 is convexly formed on the inner wall of the first valve sleeve 130, and the second stopper 122 is convexly formed on the inner wall of the second valve sleeve 140.

[0079] It should be noted that the guide portion 120 and the stop portion may have the same structure or different structures, and this application does not limit this.

[0080] The first elastic member 310 and the second elastic member 320 may be springs. The first elastic member 310 is sleeved around the outer circumference of one of the guide posts 410. One end of the first elastic member 310 abuts the first stopper 121 of the first valve sleeve 130, and the other end abuts the piston assembly 200. The second elastic member 320 is sleeved around the outer circumference of the other guide post 410. One end of the second elastic member 320 abuts the second stopper 122 of the second valve sleeve 140, and the other end abuts the piston assembly 200.

[0081] like Figure 4 As shown, the piston assembly 200 includes a first sealing member 201 that seals against the first valve port 101, and a second sealing member 202 that seals against the second valve port 102. When the first sealing member 201 is compressed by the first valve port 101 to a first predetermined deformation, the first stopper 121 abuts against the piston assembly 200, preventing the piston assembly 200 from moving further toward sealing the first valve port 101, thereby preventing over-compression of the first sealing member 201 and damage to the first sealing member 201. When the second sealing member 202 is compressed by the second valve port 102 to a second predetermined deformation, the second stopper 122 abuts against the piston assembly 200, preventing the piston assembly 200 from moving further toward sealing the second valve port 102, thereby preventing over-compression of the second sealing member 202 and damage to the second sealing member 202.

[0082] In one embodiment, the first sealing member 201 and the second sealing member 202 are both O-rings.

[0083] [Fluid Control Valve of the Second Embodiment]

[0084] like Figure 5 As shown, the similarities between the fluid control valve of the second embodiment of the present application and the fluid control valve of the first embodiment are not repeated here, and the differences are as follows:

[0085] The piston assembly 200 includes a first piston 210 and a second piston 220 arranged opposite to each other along the axial direction of the valve body 100, the first piston 210 is used to block the first valve port 101, and the second piston 220 is used to block the second valve port 102; the elastic assembly 300 is arranged between the first piston 210 and the second piston 220, and is used to provide an elastic force to the first piston 210 and the second piston 220 to move away from each other.

[0086] It is understandable that when the piston assembly 200 is in a balanced state, the first piston 210 blocks the first valve port 101 and the second piston 220 blocks the second valve port 102 , that is, the first valve port 101 and the second valve port 102 are both in a closed state.

[0087] When the fluid pressure at the first opening 103 is greater than the fluid pressure at the third opening 105, the first piston 210 is driven by the fluid pressure differential to move toward the second piston 220. During this movement, the first piston 210 squeezes the elastic assembly 300, increasing the compression of the elastic assembly 300 and gradually opening the first valve port 101. Simultaneously, the second piston 220, under the elastic force provided by the elastic assembly 300, compresses the second valve port 102.

[0088] When the fluid pressure at the third opening 105 is greater than the fluid pressure at the first opening 103, the second piston 220 is driven by the fluid pressure differential to move closer to the first piston 210. During this movement, the second piston 220 squeezes the elastic assembly 300, increasing the amount of compression of the elastic assembly 300 and gradually opening the second valve port 102. Simultaneously, the first piston 210, under the elastic force provided by the elastic assembly 300, compresses the first valve port 101.

[0089] like Figure 5 As shown, the first piston 210 has a first groove 211 on the side facing the second piston 220, and one end of the elastic component 300 is located in the first groove 211 and abuts against the bottom surface of the first groove 211; the second piston 220 has a second groove 221 on the side facing the first piston 210, and the other end of the elastic component 300 is located in the second groove 221 and abuts against the bottom surface of the second groove 221.

[0090] In the embodiment of the present application, the two ends of the elastic component 300 are respectively arranged in the first groove 211 and the second groove 221. The first groove 211 and the second groove 221 can limit the movement of the elastic component 300 and prevent the elastic component 300 from moving along the axial direction perpendicular to the valve body 100.

[0091] Continue reading Figure 5 The side of the first piston 210 facing away from the second piston 220 is movably connected to the valve body 100 through a guide structure 400 , and the side of the second piston 220 facing away from the first piston 210 is movably connected to the valve body 100 through another guide structure 400 .

[0092] Among them, the guide structure 400 can include a guide column 410 and a guide hole 420, the guide column 410 is integrally connected to the first piston 210 or the second piston 220, the guide hole 420 is provided in the valve body 100, the guide column 410 is passed through the guide hole 420, and the outer surface of the guide column 410 is guided and matched with the hole wall surface of the guide hole 420.

[0093] When the first sealing member 201 is compressed by the first valve port 101 to a first predetermined deformation, the first stopper 121 abuts against the first piston 210, preventing the first piston 210 from moving further in the direction of sealing the first valve port 101, thereby preventing over-compression of the first sealing member 201 and damage to the first sealing member 201. When the second sealing member 202 is compressed by the second valve port 102 to a second predetermined deformation, the second stopper 122 abuts against the second piston 220, preventing the second piston 220 from moving further in the direction of sealing the second valve port 102, thereby preventing over-compression of the second sealing member 202 and damage to the second sealing member 202.

[0094] [Refrigeration system example]

[0095] In another aspect of the present application, a refrigeration system is provided, including a device 10, a first fluid control valve 20a, a three-way valve 50, a third expansion valve 73, a second heat exchanger 32, and a first heat exchanger 31. A first pipe 81 is provided between the device 10 and the first heat exchanger 31, a second pipe 82 is provided between the device 10 and the second heat exchanger 32, and a third pipe 83 is provided between the first pipe 81 and the second pipe 82. The first fluid control valve 20a is located in the third pipe 83. The first fluid control valve 20a, the second heat exchanger 32, the third expansion valve 73, and the first heat exchanger 31 form a circulation flow path through the pipeline. The first fluid control valve 20a can be the fluid control valve of any of the above-described embodiments.

[0096] The apparatus 10 has an inlet 11 and an outlet 12. The pressure of the fluid flowing out of the apparatus 10 through the outlet 12 is greater than the pressure of the fluid flowing into the apparatus 10 through the inlet 11. The inlet 11 of the apparatus 10 is connected to the second opening 104 of the first fluid control valve 20a. The three-way valve 50 has an inlet 51, a first outlet 52, and a second outlet 53.

[0097] The device 10 has a first operating mode and a second operating mode. In the embodiment of the present application, the first operating mode is a cooling mode, and the second operating mode is a heating mode.

[0098] like Figure 7As shown, in the second operating condition, the outlet 12 of the device 10 is connected to the first opening 103 of the first fluid control valve 20a through the inlet and second outlet 53 of the three-way valve 50, the first heat exchanger 31, the third expansion valve 73, and the second heat exchanger 32. The piston assembly 200 of the first fluid control valve 20a is driven by the fluid pressure difference to switch the first fluid control valve 20a to connect with the first opening 103 and the second opening 104.

[0099] Specifically, when the outlet 12 of the device 10 is connected to the first opening 103 of the first fluid control valve 20a, the pressure difference between the fluid in the first opening 103 and the fluid in the third opening 105 drives the piston assembly 200 to switch the first opening 103 to communicate with the second opening 104.

[0100] like Figure 6 As shown, in the first working condition, the outlet 12 is connected to the third opening 105 of the first fluid control valve 20 a through the inlet and first outlet 52 of the three-way valve 50 , the second heat exchanger 32 , the third expansion valve 73 , and the first heat exchanger 31 .

[0101] Specifically, when the outlet 12 of the device 10 is connected to the third opening 105 of the first fluid control valve 20a, the pressure difference between the fluid in the third opening 105 and the fluid in the second opening 104 drives the piston assembly 200 to switch the third opening 105 to communicate with the second opening 104.

[0102] In one embodiment, the device 10 may be a compressor, but is not limited thereto.

[0103] In one embodiment, the three-way valve 50 may be a stop valve, a solenoid valve, or the like. The inlet 51 of the three-way valve 50 communicates with the outlet 12 of the device 10. In the second operating condition, the second outlet 53 of the three-way valve 50 communicates with the first opening 103 of the first fluid control valve 20a. In the first operating condition, the first outlet 52 of the three-way valve 50 communicates with the third opening 105 of the first fluid control valve 20a.

[0104] The refrigeration system of the present embodiment further includes a gas-liquid separator 60, through which the second opening 104 of the first fluid control valve 20a communicates with the inlet 11 of the device 10. Before the fluid flows back into the device 10, the gas-liquid separator 60 is used to separate the fluid into gas and liquid.

[0105] It should be noted that a first valve (not shown) is provided in the pipe connected to the first opening 103 of the first fluid control valve 20a, and a second valve (not shown) is provided in the pipe connected to the third opening 105 of the first fluid control valve 20a. In cooling mode, the first valve is closed and the second valve is open. In heating mode, the first valve is open and the second valve is closed.

[0106] like Figure 6 As shown, in cooling mode (device 10 is in the first operating state), the second outlet 53 of the three-way valve 50 is closed, and the inlet 51 is connected to the first outlet 52. Since the first valve is closed and the second valve is open, the high-pressure fluid flowing out of the device 10 cannot flow into the first fluid control valve 20a from the first opening 103 after passing through the three-way valve 50. Instead, the high-pressure fluid can pass through the second heat exchanger 32, the third expansion valve 73, and the first heat exchanger 31 in sequence to become a low-pressure fluid, and then flow back to the third opening 105 of the first fluid control valve 20a. The fluid then flows back to the device 10 through the second opening 104 and the gas-liquid separator 60.

[0107] like Figure 7 As shown, in the heating mode (device 10 is in the second operating state), the first outlet 52 of the three-way valve 50 is closed, and the inlet 51 is connected to the second outlet 53. Since the second valve is closed and the first valve is open, the high-pressure fluid flowing out of the device 10 cannot flow into the first fluid control valve 20a from the third opening 105 of the first fluid control valve 20a after passing through the three-way valve 50. Instead, it can pass through the first heat exchanger 31, the third expansion valve 73, and the second heat exchanger 32 in sequence to become a low-pressure fluid, then flow back to the first opening 103 of the first fluid control valve 20a, and then flow back to the device 10 through the second opening 104 and the gas-liquid separator 60.

[0108] like Figure 8 and Figure 9 As shown, the refrigeration system further includes a second fluid control valve 20b and a third heat exchanger 40. The second opening 104 of the second fluid control valve 20b is connected to the inlet 11 of the device 10 through the third heat exchanger 40. The second fluid control valve 20b is a fluid control valve according to any of the above embodiments. A fourth pipe 84 is provided between the second heat exchanger 32 and the first heat exchanger 31, and the second fluid control valve 20b is located in the fourth pipe 84. The refrigeration system further includes a fifth pipe 85, one end of which is connected to the fourth pipe 84 between the second heat exchanger 32 and the second fluid control valve 20b, and the other end of the fifth pipe 85 is connected to the fourth pipe 84 between the first heat exchanger 31 and the second fluid control valve 20b.

[0109] Among them, such as Figure 8 As shown, in the first working condition, the outlet 12 of the device 10 is connected to the first opening 103 of the second fluid control valve 20b through the second heat exchanger 32, and the piston assembly 200 of the second fluid control valve 20b is driven by the fluid pressure difference to switch the second fluid control valve 20b to connect with the first opening 103 and the second opening 104.

[0110] like Figure 9As shown, in the second working condition, the outlet 12 of the device 10 is connected to the third opening 105 of the second fluid control valve 20b through the first heat exchanger 31, and the piston assembly 200 of the second fluid control valve 20b is driven by the fluid pressure difference to switch the second fluid control valve 20b to connect the third opening 105 and the second opening 104.

[0111] In one embodiment, the third heat exchanger 40 may include a first sub-heat exchanger 41 and a second sub-heat exchanger 42, wherein the first sub-heat exchanger 41 and the second sub-heat exchanger 42 are arranged in parallel. The first sub-heat exchanger 41 is connected to the second opening 104 of the second fluid control valve 20 b via the first expansion valve 71, and the second sub-heat exchanger 42 is connected to the second opening 104 of the second fluid control valve 20 b via the second expansion valve 72.

[0112] It should be noted that the third heat exchanger 40 may include one or more sub-heat exchangers.

[0113] like Figure 8 As shown, when the first sub-heat exchanger 41 is in heat dissipation mode, the second outlet 53 of the three-way valve 50 is closed, and the inlet 51 is connected to the first outlet 52. The high-pressure fluid flowing out of the device 10 passes through the three-way valve 50 and the second heat exchanger 32, flows into the first opening 103 of the second fluid control valve 20b, then flows through the second opening 104 into the first expansion valve 71, becomes low-pressure fluid, and then flows into the first sub-heat exchanger 41. After passing through the first sub-heat exchanger 41, it flows back to the gas-liquid separator 60 and finally back into the device 10.

[0114] like Figure 9 As shown, when the first sub-heat exchanger 41 is in heat recovery mode, the first outlet 52 of the three-way valve 50 is closed, and the inlet 51 is connected to the second outlet 53. The high-pressure fluid flowing out of the device 10 passes through the three-way valve 50 and the first heat exchanger 31, flows into the third opening 105 of the second fluid control valve 20b, then flows through the second opening 104 into the first expansion valve 71, becomes low-pressure fluid, and then flows into the first sub-heat exchanger 41. After passing through the first sub-heat exchanger 41, it flows back to the gas-liquid separator 60 and finally back into the device 10.

[0115] like Figure 10 As shown, when the second sub-heat exchanger 42 is in heat dissipation mode, the second outlet 53 of the three-way valve 50 is closed, and the inlet 51 is connected to the first outlet 52. The high-pressure fluid flowing out of the device 10 passes through the three-way valve 50 and the second heat exchanger 32, flows into the first opening 103 of the second fluid control valve 20b, then flows through the second opening 104 into the second expansion valve 72, becomes low-pressure fluid, and then flows into the second sub-heat exchanger 42. After passing through the second sub-heat exchanger 42, it flows back to the gas-liquid separator 60 and finally back into the device 10.

[0116] like Figure 11 As shown, when the second sub-heat exchanger 42 is in heat recovery mode, the first outlet 52 of the three-way valve 50 is closed, and the inlet 51 is connected to the second outlet 53. The high-pressure fluid flowing out of the device 10 passes through the three-way valve 50 and the first heat exchanger 31, flows into the third opening 105 of the second fluid control valve 20b, then flows through the second opening 104 into the second expansion valve 72, where it becomes low-pressure fluid and flows into the second sub-heat exchanger 42. After passing through the second sub-heat exchanger 42, it flows back to the gas-liquid separator 60 and finally back into the device 10.

[0117] It is understandable that the various embodiments / implementations provided in this application can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

[0118] In the application examples, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the application examples can be understood according to the specific circumstances.

[0119] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the application embodiments.

[0120] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the claimed invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0121] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fluid control valve, characterized in that: include: A valve body comprising an inner cavity having a first valve port and a second valve port, the valve body further comprising a first opening, a second opening, and a third opening communicating with the inner cavity; the first opening, the first valve port, the second opening, the second valve port, and the third opening being arranged in sequence along the axial direction of the valve body; a piston assembly, movably disposed in the inner cavity of the valve body, for blocking the first valve port and / or the second valve port; In which, the driving force of the piston assembly is the fluid pressure difference. When the fluid pressure in the first opening is greater than the fluid pressure in the third opening, the piston assembly is driven by the fluid pressure difference to open the first valve port, the first opening is connected to the second opening, and the piston assembly blocks the second valve port; when the fluid pressure in the third opening is greater than the fluid pressure in the first opening, the piston assembly is driven by the fluid pressure difference to open the second valve port, the second opening is connected to the third opening, and the piston assembly blocks the first valve port.

2. The fluid control valve according to claim 1, wherein: Also includes: The elastic component is used to keep the piston component in a balanced state; wherein the balanced state means that the piston component remains stationary relative to the valve body in the absence of fluid impact.

3. The fluid control valve according to claim 2, characterized in that: The elastic component includes a first elastic member and a second elastic member, the first elastic member and the second elastic member are respectively located at the two ends of the piston component along the axial direction of the valve body, the first elastic member is used to provide the piston component with a first elastic force moving in the direction of blocking the second valve port, and the second elastic member is used to provide the piston component with a second elastic force moving in the direction of blocking the first valve port; when the piston assembly is in a balanced state, the first valve port and the second valve port are both in an open state.

4. The fluid control valve according to claim 2, wherein: The piston assembly includes a first piston and a second piston arranged opposite to each other along the axial direction of the valve body, the first piston is used to block the first valve port, and the second piston is used to block the second valve port; The elastic component is arranged between the first piston and the second piston, and is used to provide an elastic force to the first piston and the second piston to move away from each other. When the piston component is in a balanced state, the first valve port and the second valve port are both in a closed state.

5. The fluid control valve according to claim 4, characterized in that: The first piston has a first groove on a side facing the second piston, and one end of the elastic component is located in the first groove and abuts against the bottom surface of the first groove; The second piston has a second groove on a side facing the first piston. The other end of the elastic component is located in the second groove and abuts against the bottom surface of the second groove.

6. The fluid control valve according to claim 1, wherein: The piston assembly is movably connected to the valve body through a guide structure; the guide structure includes a guide column and a guide hole, the guide column is integrally connected to the piston assembly, the guide hole is provided in the valve body, the guide column is passed through the guide hole, and the outer surface of the guide column is guided and matched with the hole wall surface of the guide hole.

7. The fluid control valve according to claim 6, wherein: A guide portion is convexly provided on the inner wall surface of the valve body, and the guide portion has the guide hole.

8. The fluid control valve according to claim 1, wherein: The piston assembly has a first sealing member sealingly cooperating with the first valve port, and a second sealing member sealingly cooperating with the second valve port; The inner cavity is provided with a first stop portion and a second stop portion; when the first sealing member is compressed by the first valve port to a first preset deformation amount, the first stop portion abuts against the piston assembly; When the second sealing member is compressed by the second valve port to a second preset deformation amount, the second stop portion abuts against the piston assembly.

9. A refrigeration system, characterized in that: include: a device having an inlet and an outlet, wherein a pressure of a fluid flowing out of the device through the outlet is greater than a pressure of a fluid flowing into the device through the inlet; a first fluid control valve, the fluid control valve according to any one of claims 1 to 8, wherein the second opening of the first fluid control valve is in communication with the inlet; a first heat exchanger and a second heat exchanger; Wherein, the device has a first operating condition and a second operating condition; In the second working condition, the outlet of the device is connected to the first opening of the first fluid control valve through the first heat exchanger and the second heat exchanger, and the piston assembly of the first fluid control valve is driven by the fluid pressure difference to switch the first fluid control valve to connect the first opening and the second opening; In the first operating condition, the outlet is connected to the third opening of the first fluid control valve through the second heat exchanger and the first heat exchanger, and the piston assembly of the first fluid control valve is driven by the fluid pressure difference to switch the first fluid control valve to connect the third opening and the second opening.

10. The refrigeration system according to claim 9, characterized in that A first pipeline is provided between the device and the first heat exchanger, a second pipeline is provided between the device and the second heat exchanger, a third pipeline is provided between the first pipeline and the second pipeline, and a first fluid control valve is located in the third pipeline.

11. The refrigeration system according to claim 9, wherein: Also includes: The second fluid control valve is the fluid control valve according to any one of claims 1 to 8; a third heat exchanger, wherein the second opening of the second fluid control valve is in communication with the inlet of the device through the third heat exchanger; Wherein, in the second operating condition, the outlet of the equipment is connected to the third opening of the second fluid control valve through the first heat exchanger, and the piston assembly of the second fluid control valve is driven by the fluid pressure difference to switch the second fluid control valve to the third opening to communicate with the second opening; In the first working condition, the outlet of the equipment is connected to the first opening of the second fluid control valve through the second heat exchanger, and the piston assembly of the second fluid control valve is driven by the fluid pressure difference to switch the second fluid control valve to connect the first opening and the second opening.

12. The refrigeration system according to claim 11, wherein: A fourth pipeline is provided between the second heat exchanger and the first heat exchanger, and the second fluid control valve is located in the fourth pipeline; The refrigeration system further includes a fifth pipe, one end of which is connected to the fourth pipe between the second heat exchanger and the second fluid control valve, and the other end of which is connected to the fourth pipe between the first heat exchanger and the second fluid control valve.

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