Fluid control valve and refrigeration system

Abstract

A fluid control valve, comprising a valve body (100) and a piston assembly (200). The valve body comprises an inner cavity (110) having a first valve port (101) and a second valve port (102), and the valve body further has a first opening (103), a second opening (104) and a third opening (105) that are communicated with the inner cavity; along the axial direction of the valve body, the first opening, the first valve port, the second opening, the second valve port, and the third opening are sequentially arranged; the piston assembly is movably arranged in the inner cavity of the valve body and is used for blocking the first valve port and / or the second valve port; when the fluid pressure in the first opening is greater than the fluid pressure in the third opening, the piston assembly is driven by a fluid pressure difference to open the first valve port, the first opening is communicated with the second opening, and the piston assembly blocks the second valve port; and when the fluid pressure in the third opening is greater than the fluid pressure in the first opening, the piston assembly is driven by a fluid pressure difference to open the second valve port, the second opening is communicated with the third opening, and the piston assembly blocks the first valve port. Also disclosed is a refrigeration system comprising the fluid control valve.

Description

Fluid control valve and refrigeration system

[0001] The present disclosure claims priority to Chinese Patent Application No. 202422371441.4, filed September 27, 2024, the entire contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of valves, and in particular, to a fluid control valve and a refrigeration system comprising the same. BACKGROUND

[0003] In the field of fluid control, in order to achieve the circulation of fluid in two flow paths, two valves are usually required to be arranged. One of the valves is arranged in one of the flow paths, and the other valve is arranged in the other flow path. By controlling the opening or closing of the two valves respectively, the circulation of fluid in the two flow paths is achieved. However, the arrangement of two valves in two systems not only increases the volume of the system, but also increases the cost.

[0004] SUMMARY

[0005] The present disclosure provides a fluid control valve and a refrigeration system to solve the problems of large volume and high cost in the related art.

[0006] According to one aspect of the present disclosure, the fluid control valve of the present disclosure comprises:

[0007] a valve body having an inner cavity, the inner cavity having a first valve port and a second valve port, the valve body further having a first opening, a second opening and a third opening in communication with the inner cavity; the first opening, the first valve port, the second opening, the second valve port and the third opening are arranged in sequence along the axial direction of the valve body; and

[0008] a piston assembly movably arranged in the inner cavity of the valve body for blocking the first valve port and / or the second valve port;

[0009] wherein 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 in communication with 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 in communication with the third opening, and the piston assembly blocks the first valve port.

[0010] According to one embodiment of the present disclosure, the fluid control valve further comprises:

[0011] a resilient assembly for balancing the piston assembly; wherein the balancing state means that the piston assembly remains stationary relative to the valve body under no fluid impact.

[0012] According to one embodiment of the present disclosure, the resilient assembly comprises a first resilient member and a second resilient member, the first resilient member and the second resilient member are respectively located at two ends of the piston assembly along the axial direction of the valve body, the first resilient member is used to provide a first resilient force to the piston assembly for moving towards the direction of blocking the second valve port, and the second resilient member is used to provide a second resilient force to the piston assembly for moving towards the direction of blocking the first valve port; when the piston assembly is in the balancing state, the first valve port and the second valve port are both in the open state.

[0013] According to one embodiment of the present disclosure, the piston assembly comprises a first piston and a second piston arranged oppositely 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.

[0014] The resilient assembly is arranged between the first piston and the second piston, and is used to provide a resilient force to the first piston and the second piston for moving towards the direction of moving away from each other, and when the piston assembly is in the balancing state, the first valve port and the second valve port are both in the closed state.

[0015] According to one embodiment of the present disclosure, the first piston has a first groove on the side facing the second piston, one end of the resilient assembly is located in the first groove and abuts against the groove bottom surface of the first groove.

[0016] The second piston has a second groove on the side facing the first piston, the other end of the resilient assembly is located in the second groove and abuts against the groove bottom surface of the second groove.

[0017] According to one embodiment of the present disclosure, the piston assembly is movably connected to the valve body through a guide structure; the guide structure comprises a guide column and a guide hole, the guide column is integrally connected to the piston assembly, the guide hole is arranged on the valve body, the guide column is arranged in the guide hole, and the outer surface of the guide column is guided and matched with the hole wall surface of the guide hole.

[0018] According to one embodiment of the present disclosure, the inner wall surface of the valve body is convexly provided with a guide portion, and the guide portion has the guide hole.

[0019] According to one embodiment of the present disclosure, the piston assembly has a first sealing member and a second sealing member, the first sealing member is sealingly matched with the first valve port, and the second sealing member is sealingly matched with the second valve port.

[0020] The inner cavity has 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.

[0021] According to another aspect of the present disclosure, a refrigeration system of an embodiment of the present disclosure comprises:

[0022] An apparatus has an inlet and an outlet, a fluid pressure flowing out of the apparatus through the outlet being greater than a fluid pressure flowing into the apparatus through the inlet;

[0023] A first fluid control valve, being any one of the fluid control valves described above, a second opening of the first fluid control valve being in communication with the inlet;

[0024] A first heat exchanger and a second heat exchanger;

[0025] The apparatus has a first working condition and a second working condition;

[0026] In the second working condition, the outlet of the apparatus is in communication with 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 a fluid pressure difference to switch the first fluid control valve to a state in which the first opening and the second opening are in communication;

[0027] In the first working condition, the outlet is in communication with 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 a fluid pressure difference to switch the first fluid control valve to a state in which the third opening and the second opening are in communication.

[0028] According to one embodiment of the present disclosure, a first pipeline is arranged between the apparatus and the first heat exchanger, a second pipeline is arranged between the apparatus and the second heat exchanger, a third pipeline is arranged between the first pipeline and the second pipeline, and the first fluid control valve is arranged in the third pipeline.

[0029] According to one embodiment of the present disclosure, the refrigeration system further comprises:

[0030] A second fluid control valve, being any one of the fluid control valves described above;

[0031] A third heat exchanger, a second opening of the second fluid control valve being in communication with the inlet of the apparatus through the third heat exchanger;

[0032] In the second working condition, the outlet of the device is communicated with 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 communicate the third opening and the second opening.

[0033] In the first working condition, the outlet of the device is communicated with 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 communicate the first opening and the second opening.

[0034] According to one embodiment of the present disclosure, a fourth pipeline is arranged between the second heat exchanger and the first heat exchanger, and the second fluid control valve is arranged in the fourth pipeline.

[0035] The refrigeration system further comprises a fifth pipeline, one end of the fifth pipeline is connected to the part of the fourth pipeline between the second heat exchanger and the second fluid control valve, and the other end of the fifth pipeline is connected to the part of the fourth pipeline between the first heat exchanger and the second fluid control valve.

[0036] One embodiment in the above application has at least the following advantages or beneficial effects:

[0037] The fluid control valve of the embodiment of the present disclosure is driven by the fluid pressure difference, and the piston assembly can move in 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 opening, the first opening is communicated with the second opening, and the piston assembly seals the second valve opening. 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 opening, the third opening is communicated with the second opening, and the piston assembly seals the first valve opening. In this way, the effect of switching the flow path is achieved. Compared with the design of two valves in the related art, the embodiment of the present disclosure can complete the switching of the flow path by using one fluid control valve, which reduces the volume and saves the cost. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0039] FIG. 1 shows a top view of a fluid control valve according to a first embodiment of the present disclosure.

[0040] FIG. 2 shows a perspective view of the fluid control valve according to the first embodiment of the present disclosure from one viewing angle.

[0041] FIG. 3 shows a perspective view of the fluid control valve according to the first embodiment of the present disclosure from another viewing angle.

[0042] Fig. 4 shows a sectional view along the sectioning line A-A in Fig. 1.

[0043] Fig. 5 shows a sectional view of a fluid control valve according to a second embodiment of the disclosure.

[0044] Fig. 6 shows a flow chart of a refrigeration system according to an embodiment of the disclosure in a cooling mode.

[0045] Fig. 7 shows a flow chart of a refrigeration system according to an embodiment of the disclosure in a heating mode.

[0046] Fig. 8 shows a flow chart of a first sub-cooler of a refrigeration system according to an embodiment of the disclosure in a cooling mode.

[0047] Fig. 9 shows a flow chart of a first sub-cooler of a refrigeration system according to an embodiment of the disclosure in a heat recovery mode.

[0048] Fig. 10 shows a flow chart of a second sub-cooler of a refrigeration system according to an embodiment of the disclosure in a cooling mode.

[0049] Fig. 11 shows a flow chart of a second sub-cooler of a refrigeration system according to an embodiment of the disclosure in a heat recovery mode.

[0050] Wherein, the reference signs are explained as follows: 10, apparatus; 11, inlet; 12, outlet; 20a, first fluid control valve; 20b, second fluid control valve; 31, first heat exchanger; 32, second heat exchanger; 41, first sub-cooler; 42, second sub-cooler; 50, three-way valve; 51, inlet; 52, first outlet; 53, second outlet; 60, gas-liquid separator; 71, first expansion valve; 72, second expansion valve; 73, third expansion valve; 81, first pipe; 82, second pipe; 83, third pipe; 84, fourth pipe; 85, fifth pipe; 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; 200, piston assembly; 201, first sealing member; 202, second sealing member; 210, first piston; 211, first groove; 220, second piston; 221, second groove; 300, elastic assembly; 310, first elastic member; 320, second elastic member; 400, guide structure; 410, guide post; 420, guide hole. DETAILED DESCRIPTION

[0051] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any number of manners, and are not limited to the embodiments described herein; rather, embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the description, and thus a detailed description will not be repeated.

[0052] It is to be understood that the terms "including", "comprising", "having" and their conjugates, as used throughout this disclosure, are meant to be taken inclusively and not in an exhaustive sense. That is, processes, methods, systems, products, or apparatuses that include, have, or are

[0053]

Fluid control valve of first embodiment

[0054] As shown in FIGS. 1-4, the fluid control valve of the first embodiment of the present disclosure 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, and the valve body 100 further has a first opening 103, a second opening 104, and a third opening 105 in communication 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 arranged in the inner cavity 110 of the valve body 100, and is used to block the first valve port 101 and / or the second valve port 102; the elastic assembly 300 is used to keep the piston assembly 200 in a balanced state; the balanced state means that the piston assembly 200 remains stationary relative to the valve body 100 under no fluid impact. When the fluid pressure flowing into the inner cavity 110 from the first opening 103 is greater than the fluid pressure 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 in communication with the second opening 104; when the fluid pressure flowing into the inner cavity 110 from the third opening 105 is greater than the fluid pressure 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 in communication with the third opening 105.

[0055] When the piston assembly 200 opens the first valve port 101, the fluid pressure in the first opening 103 is greater than the fluid pressure in the second opening 104 at the same time. When the piston assembly 200 opens the second valve port 102, the fluid pressure in the third opening 105 is greater than the fluid pressure in the second opening 104 at the same time. Preferably, the first opening 103 and the third opening 105 are fluid inlets, and the second opening 104 is a fluid outlet.

[0056] The fluid control valve of the embodiment of the present disclosure is driven by a fluid pressure difference, and the piston assembly 200 can move in the valve body 100. When the fluid pressure in the first opening 103 is greater than the fluid pressure in 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 and the second opening 104 are communicated. When the fluid pressure in the third opening 105 is greater than the fluid pressure in 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 and the second opening 104 are communicated. In this way, the effect of switching the flow path is achieved. Compared with the design of two one-way valves in the related art, the embodiment of the present disclosure uses one fluid control valve to complete the switching of the flow path only by the fluid pressure difference, which reduces the volume and saves the cost, and at the same time, does not need other driving mechanisms.

[0057] As shown in FIGS. 2 to 4, the valve body 100 can include a first valve sleeve 130, a second valve sleeve 140, and a valve cap 150. Along the axial direction of the valve body 100, the valve cap 150, the second valve sleeve 140, and the first valve sleeve 130 are arranged in sequence. The valve cap 150 is fixedly connected with the second valve sleeve 140, and the second valve sleeve 140 is fixedly connected with the first valve sleeve 130. Among them, the valve cap 150 and the second valve sleeve 140, and the second valve sleeve 140 and the first valve sleeve 130 can be connected by welding, interference fit, or the valve cap 150 and the second valve sleeve 140 are integrated, which is not particularly limited in the present disclosure.

[0058] In an embodiment, the valve cap 150 has the first opening 103, the second valve sleeve 140 has the first valve port 101, and the first valve sleeve 130 has the second valve port 102, the second opening 104, and the third opening 105.

[0059] Of course, in other embodiments, the valve body 100 can also include the valve cap 150 and one valve sleeve, and the valve cap 150 is connected with the valve sleeve. The valve cap 150 can have the first opening 103, and the valve sleeve has the first valve port 101, the second valve port 102, the second opening 104, and the third opening 105.

[0060] As shown in FIG. 4, 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.

[0061] As shown in FIG. 4, the elastic assembly 300 includes a first elastic member 310 and a second elastic member 320, which are respectively located at two ends of the piston assembly 200 along the axial direction of the valve body 100. The first elastic member 310 is configured to provide a first elastic force to the piston assembly 200 to move in a direction of blocking the second valve port 102, and the second elastic member 320 is configured to provide a second elastic force to the piston assembly 200 to move in a direction of blocking the first valve port 101.

[0062] 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 move in a direction of blocking the second valve port 102. During the movement of the piston assembly 200, the second elastic member 320 is compressed by the piston assembly 200, resulting in an increase in the compression amount, and the compression amount of the first elastic member 310 decreases.

[0063] 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 move in a direction of blocking the first valve port 101. During the movement of the piston assembly 200, the first elastic member 310 is compressed by the piston assembly 200, resulting in an increase in the compression amount, and the compression amount of the second elastic member 320 decreases.

[0064] 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.

[0065] As shown in FIG. 4, the piston assembly 200 is movably connected to the valve body 100 through a guide structure 400. In the embodiment of the present disclosure, the guide structure 400 is configured to guide the piston assembly 200 to move along the axial direction of the valve body 100, so as to avoid the piston assembly 200 from being deflected due to movement, thereby affecting the sealing performance of the piston assembly 200 in blocking the first valve port 101 or the second valve port 102.

[0066] As an example, the two 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.

[0067] In an embodiment, the guide structure 400 can 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 on the valve body 100, the guide column 410 is arranged in the guide hole 420, and the outer surface of the guide column 410 is guided by the hole wall surface of the guide hole 420.

[0068] As an example, the inner wall surface of the valve body 100 is provided with a guide portion 120, and the guide portion 120 has a guide hole 420.

[0069] As shown in FIG. 4, in the embodiment of the present disclosure, the piston assembly 200 is provided with a guide column 410 at each of the axial ends of the valve body 100, and the axes of the two guide columns 410 coincide. The valve body 100 is provided with two guide portions 120, and the two guide portions 120 are arranged at intervals along the axial direction of the valve body 100. The two guide columns 410 are guided by the guide holes 420 of the two guide portions 120, respectively.

[0070] In an embodiment, the inner wall surface of the valve body 100 is provided with a first stop portion 121 and a second stop portion 122, the first stop portion 121 and the second stop portion 122 are arranged at intervals along the movement direction of the piston assembly, and the piston assembly is located between the first stop portion 121 and the second stop portion 122. In the embodiment of the present disclosure, the inner wall surface of the first valve sleeve 130 is provided with the first stop portion 121, and the inner wall surface of the second valve sleeve 140 is provided with the second stop portion 122.

[0071] It should be noted that the guide portion 120 and the stop portion can be the same structure or different structures, and the present disclosure does not limit this.

[0072] The first elastic member 310 and the second elastic member 320 can be springs. The first elastic member 310 is sleeved on the outer periphery of one of the guide columns 410, one end of the first elastic member 310 abuts against the first stop portion 121 of the first valve sleeve 130, and the other end abuts against the piston assembly 200. The second elastic member 320 is sleeved on the outer periphery of the other guide column 410, one end of the second elastic member 320 abuts against the second stop portion 122 of the second valve sleeve 140, and the other end abuts against the piston assembly 200.

[0073] As shown in FIG. 4, the piston assembly 200 has a first sealing member 201 in sealing cooperation with the first valve port 101, and a second sealing member 202 in sealing cooperation with the second valve port 102. When the first sealing member 201 is compressed to a first preset deformation amount by the first valve port 101, the first stop portion 121 abuts against the piston assembly 200, which stops the piston assembly 200 from continuing to move in the direction of sealing the first valve port 101, thereby preventing the first sealing member 201 from being damaged due to excessive compression. When the second sealing member 202 is compressed to a second preset deformation amount by the second valve port 102, the second stop portion 122 abuts against the piston assembly 200, which stops the piston assembly 200 from continuing to move in the direction of sealing the second valve port 102, thereby preventing the second sealing member 202 from being damaged due to excessive compression.

[0074] In an embodiment, the first seal 201 and the second seal 202 are both O-rings.

[0075] Fluid control valve of the second embodiment

[0076] As shown in FIG. 5, the fluid control valve of the second embodiment of the present disclosure is the same as the fluid control valve of the first embodiment, and the difference lies in that:

[0077] The piston assembly 200 includes a first piston 210 and a second piston 220 arranged in axial opposition along the valve body 100, the first piston 210 being configured to block the first valve port 101, and the second piston 220 being configured to block the second valve port 102; and the elastic assembly 300 is arranged between the first piston 210 and the second piston 220, and configured to provide an elastic force to the first piston 210 and the second piston 220 in a direction away from each other.

[0078] It can be understood 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, i.e., the first valve port 101 and the second valve port 102 are both in a closed state.

[0079] When the fluid pressure of the first opening 103 is greater than the fluid pressure of the third opening 105, the first piston 210 is driven by the fluid pressure difference to move in a direction close to the second piston 220. During the movement of the first piston 210, the first piston 210 extrudes the elastic assembly 300 so that the compression amount of the elastic assembly 300 becomes larger, and the first piston 210 gradually opens the first valve port 101. At the same time, the second piston 220 is compressed by the elastic force provided by the elastic assembly 300.

[0080] When the fluid pressure of the third opening 105 is greater than the fluid pressure of the first opening 103, the second piston 220 is driven by the fluid pressure difference to move in a direction close to the first piston 210. During the movement of the second piston 220, the second piston 220 extrudes the elastic assembly 300 so that the compression amount of the elastic assembly 300 becomes larger, and the second piston 220 gradually opens the second valve port 102. At the same time, the first piston 210 is compressed by the elastic force provided by the elastic assembly 300.

[0081] As shown in FIG. 5, the side of the first piston 210 facing the second piston 220 has a first groove 211, one end of the elastic assembly 300 is located in the first groove 211, and abuts against the groove bottom surface of the first groove 211; the side of the second piston 220 facing the first piston 210 has a second groove 221, the other end of the elastic assembly 300 is located in the second groove 221, and abuts against the groove bottom surface of the second groove 221.

[0082] In the embodiments of the present disclosure, the two ends of the elastic assembly 300 are arranged in the first groove 211 and the second groove 221 respectively, and the first groove 211 and the second groove 221 can limit the movement of the elastic assembly 300, avoiding the movement of the elastic assembly 300 along the axial direction perpendicular to the valve body 100.

[0083] Referring to FIG. 5, the side of the first piston 210 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 away from the first piston 210 is movably connected to the valve body 100 through another guide structure 400.

[0084] 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 arranged on the valve body 100, the guide column 410 is arranged in 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.

[0085] When the first seal 201 is compressed to the first preset deformation amount by the first valve port 101, the first stop portion 121 abuts against the first piston 210, so as to stop the first piston 210 from continuing to move towards the direction of sealing the first valve port 101, thereby preventing the first seal 201 from being damaged due to excessive compression. When the second seal 202 is compressed to the second preset deformation amount by the second valve port 102, the second stop portion 122 abuts against the second piston 220, so as to stop the second piston 220 from continuing to move towards the direction of sealing the second valve port 102, thereby preventing the second seal 202 from being damaged due to excessive compression.

[0086]

Refrigeration system embodiments

[0087] Another aspect of the present disclosure also provides a refrigeration system, which comprises the device 10, the first fluid control valve 20a, the three-way valve 50, the third expansion valve 73, the second heat exchanger 32 and the first heat exchanger 31. The first pipe 81 is arranged between the device 10 and the first heat exchanger 31, the second pipe 82 is arranged between the device 10 and the second heat exchanger 32, and the third pipe 83 is arranged 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 circulating flow path through pipes. The first fluid control valve 20a is the fluid control valve in any of the above embodiments.

[0088] The device 10 has an inlet 11 and an outlet 12. The fluid pressure flowing out of the device 10 through the outlet 12 is greater than the fluid pressure flowing into the device 10 through the inlet 11. The inlet 11 of the device 10 is in communication with 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.

[0089] The device 10 has a first working condition and a second working condition. In the embodiment of the present disclosure, the first working condition is a refrigeration mode, and the second working condition is a heating mode.

[0090] As shown in FIG. 7, in the second working condition, the outlet 12 of the device 10 is in communication with the inlet and the second outlet 53 of the three-way valve 50, the first heat exchanger 31, the third expansion valve 73, the second heat exchanger 32 and the first opening 103 of the first fluid control valve 20a. 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 the communication between the first opening 103 and the second opening 104.

[0091] In detail, when the outlet 12 of the device 10 is in communication with the first opening 103 of the first fluid control valve 20a, the fluid pressure difference between the first opening 103 and the third opening 105 drives the piston assembly 200 to switch to the communication between the first opening 103 and the second opening 104.

[0092] As shown in FIG. 6, in the first working condition, the outlet 12 is in communication with the inlet and the first outlet 52 of the three-way valve 50, the second heat exchanger 32, the third expansion valve 73, the first heat exchanger 31 and the third opening 105 of the first fluid control valve 20a.

[0093] In detail, when the outlet 12 of the device 10 is in communication with the third opening 105 of the first fluid control valve 20a, the fluid pressure difference between the third opening 105 and the second opening 104 drives the piston assembly 200 to switch to the communication between the third opening 105 and the second opening 104.

[0094] In an embodiment, the device 10 can be a compressor, but is not limited thereto.

[0095] In an embodiment, the three-way valve 50 can be a stop valve, a solenoid valve, etc. The inlet 51 of the three-way valve 50 is in communication with the outlet 12 of the device 10. In the second working condition, the second outlet 53 of the three-way valve 50 is in communication with the first opening 103 of the first fluid control valve 20a. In the first working condition, the first outlet 52 of the three-way valve 50 is in communication with the third opening 105 of the first fluid control valve 20a.

[0096] The refrigeration system of the embodiments of the present disclosure further comprises a gas-liquid separator 60, and the second opening 104 of the first fluid control valve 20a is communicated with the inlet 11 of the device 10 through the gas-liquid separator 60. The gas-liquid separator 60 is used for gas-liquid separation of the fluid before the fluid flows back to the device 10.

[0097] It should be noted that a first valve (not shown in the figure) is further arranged at the pipeline connected with the first opening 103 of the first fluid control valve 20a, and a second valve (not shown in the figure) is further arranged at the pipeline connected with the third opening 105 of the first fluid control valve 20a. In the refrigeration mode, the first valve is in a closed state, and the second valve is in an open state. In the heating mode, the first valve is in an open state, and the second valve is in a closed state.

[0098] As shown in FIG. 6, in the refrigeration mode (the device 10 is in the first working condition), the second outlet 53 of the three-way valve 50 is closed, and the inlet 51 is communicated with the first outlet 52. Since the first valve is in a closed state and the second valve is in an open state, the high-pressure fluid flowing out of the device 10 cannot flow into the first fluid control valve 20a from the first opening 103 of the first fluid control valve 20a after passing through the three-way valve 50, but can become low-pressure fluid after sequentially passing through the second heat exchanger 32, the third expansion valve 73 and the first heat exchanger 31, and then flow back to the third opening 105 of the first fluid control valve 20a, and flow back to the device 10 through the second opening 104 and the gas-liquid separator 60.

[0099] As shown in FIG. 7, in the heating mode (the device 10 is in the second working condition), the first outlet 52 of the three-way valve 50 is closed, and the inlet 51 is communicated with the second outlet 53. Since the second valve is in a closed state and the first valve is in an open state, 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, but can become low-pressure fluid after sequentially passing through the first heat exchanger 31, the third expansion valve 73 and the second heat exchanger 32, and then flow back to the first opening 103 of the first fluid control valve 20a, and flow back to the device 10 through the second opening 104 and the gas-liquid separator 60.

[0100] As shown in FIGS. 8 and 9, the refrigeration system further comprises a second fluid control valve 20b and a third heat exchanger 40. The second opening 104 of the second fluid control valve 20b is in communication with the inlet 11 of the device 10 through the third heat exchanger 40. The second fluid control valve 20b is the fluid control valve of any of the above embodiments. A fourth conduit 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 conduit 84. The refrigeration system further comprises a fifth conduit 85, one end of which is connected to the fourth conduit 84 between the second heat exchanger 32 and the second fluid control valve 20b, and the other end of which is connected to the fourth conduit 84 between the first heat exchanger 31 and the second fluid control valve 20b.

[0101] As shown in FIG. 8, in the first working condition, the outlet 12 of the device 10 is in communication with 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 the communication between the first opening 103 and the second opening 104.

[0102] As shown in FIG. 9, in the second working condition, the outlet 12 of the device 10 is in communication with 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 the communication between the third opening 105 and the second opening 104.

[0103] In an embodiment, the third heat exchanger 40 can comprise a first sub-heat exchanger 41 and a second sub-heat exchanger 42, and the first sub-heat exchanger 41 and the second sub-heat exchanger 42 are arranged in parallel. The first sub-heat exchanger 41 is in communication with the second opening 104 of the second fluid control valve 20b through the first expansion valve 71, and the second sub-heat exchanger 42 is in communication with the second opening 104 of the second fluid control valve 20b through the second expansion valve 72.

[0104] It should be noted that the number of sub-heat exchangers included in the third heat exchanger 40 can be one or more. Next, the case where the third heat exchanger 40 comprises the first sub-heat exchanger 41 and the second sub-heat exchanger 42 will be described.

[0105] As shown in FIG. 8, when the first sub-heat exchanger 41 is in the heat dissipation mode, the second outlet 53 of the three-way valve 50 is closed, and the inlet 51 is in communication with the first outlet 52. The high-pressure fluid flowing out of the device 10 sequentially passes through the three-way valve 50, the second heat exchanger 32, flows into the first opening 103 of the second fluid control valve 20b, and then flows into the first expansion valve 71 through the second opening 104 to become low-pressure fluid, and then flows into the first sub-heat exchanger 41, and then flows back to the gas-liquid separator 60 after passing through the first sub-heat exchanger 41, and finally flows back to the device 10.

[0106] As shown in Fig. 9, when the first sub heat exchanger 41 is in the heat energy recovery mode, the first outlet 52 of the three-way valve 50 is closed, and the inlet 51 is communicated with 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 in sequence, flows into the third opening 105 of the second fluid control valve 20b, and then flows into the first expansion valve 71 through the second opening 104 to become a low-pressure fluid, and then flows into the first sub heat exchanger 41. After passing through the first sub heat exchanger 41, the fluid returns to the gas-liquid separator 60, and finally returns to the device 10.

[0107] As shown in Fig. 10, when the second sub heat exchanger 42 is in the heat dissipation mode, the second outlet 53 of the three-way valve 50 is closed, and the inlet 51 is communicated with 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 in sequence, flows into the first opening 103 of the second fluid control valve 20b, and then flows into the second expansion valve 72 through the second opening 104 to become a low-pressure fluid, and then flows into the second sub heat exchanger 42. After passing through the second sub heat exchanger 42, the fluid returns to the gas-liquid separator 60, and finally returns to the device 10.

[0108] As shown in Fig. 11, when the second sub heat exchanger 42 is in the heat energy recovery mode, the first outlet 52 of the three-way valve 50 is closed, and the inlet 51 is communicated with 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 in sequence, flows into the third opening 105 of the second fluid control valve 20b, and then flows into the second expansion valve 72 through the second opening 104 to become a low-pressure fluid, and then flows into the second sub heat exchanger 42. After passing through the second sub heat exchanger 42, the fluid returns to the gas-liquid separator 60, and finally returns to the device 10.

[0109] It can be understood that the various embodiments / embodiments provided by the present disclosure can be combined with each other without contradiction, which will not be illustrated one by one here.

[0110] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0111] In the description of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the application.

[0112] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0113] The above is only the preferred embodiment of the application, and is not intended to limit the application. The application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A fluid control valve characterized by, The valve body has an inner cavity with a first valve port and a second valve port, and 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 are arranged in sequence along 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. The driving force of the piston assembly is 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 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 greater than the fluid pressure in the first opening, the piston assembly is driven by 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. The elastic assembly is used for keeping the piston assembly in a balanced state; in the balanced state, the piston assembly remains stationary relative to the valve body without fluid impact. The elastic assembly includes a first elastic member and a second elastic member, the first elastic member and the second elastic member are respectively arranged at the two ends of the piston assembly along the axial direction of the valve body, the first elastic member is used for providing the piston assembly with a first elastic force moving towards the direction of blocking the second valve port, and the second elastic member is used for providing the piston assembly with a second elastic force moving towards the direction of blocking the first valve port; when the piston assembly is in the balanced state, the first valve port and the second valve port are both in the open state.

2. The fluid control valve of claim 1, wherein, The piston assembly includes a first piston and a second piston arranged opposite along the axial direction of the valve body, the first piston is used for blocking the first valve port, and the second piston is used for blocking the second valve port. The elastic assembly is arranged between the first piston and the second piston and used for providing the first piston and the second piston with an elastic force moving towards the direction of moving away from each other; when the piston assembly is in the balanced state, the first valve port and the second valve port are both in the closed state.

3. The fluid control valve of claim 2, wherein, The side of the first piston facing the second piston has a first groove, one end of the elastic assembly is located in the first groove and abuts against the groove bottom surface of the first groove; 4. The fluid control valve of claim 2, wherein, The side of the second piston facing the first piston has a second groove, the other end of the elastic assembly is located in the second groove and abuts against the groove bottom surface of the second groove. The side of the first piston away from the second piston is movably connected to the valve body through a guide structure, and the side of the second piston away from the first piston is movably connected to the valve body through another guide structure.

5. The fluid control valve of claim 4, wherein, ​ ​ 6. The fluid control valve of claim 4, wherein, ​ 7. The fluid control valve of claim 1, wherein, The piston assembly is movably connected to the valve body through a guide structure; the guide structure comprises a guide post and a guide hole; the guide post is integrally connected to the piston assembly; the guide hole is arranged on the valve body; the guide post is arranged in the guide hole; the outer surface of the guide post is guided and matched with the hole wall surface of the guide hole.

8. The fluid control valve of claim 7, wherein, The inner wall surface of the valve body is convexly provided with a guide portion; the guide portion is provided with the guide hole.

9. The fluid control valve of claim 8, wherein, The piston assembly is provided with one guide post at each of the axial ends of the valve body; the axes of the two guide posts coincide.

10. The fluid control valve of claim 9, wherein, The valve body is provided with two guide portions; the two guide portions are arranged at intervals along the axial direction of the valve body; the two guide posts are guided and matched with the guide holes of the two guide portions, respectively.

11. The fluid control valve of claim 1, wherein, The piston assembly is provided with a first sealing member and a second sealing member; the first sealing member is sealingly matched with the first valve port; the second sealing member is sealingly matched 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 to a first preset deformation amount by the first valve port, the first stop portion abuts against the piston assembly; When the second sealing member is compressed to a second preset deformation amount by the second valve port, the second stop portion abuts against the piston assembly.

12. The fluid control valve of any one of claims 1 to 11, wherein, The valve body comprises a first valve sleeve, a second valve sleeve and a valve cap; along the axial direction of the valve body, the valve cap, the second valve sleeve and the first valve sleeve are arranged in sequence; the valve cap is fixedly connected with the second valve sleeve; the second valve sleeve is fixedly connected with the first valve sleeve.

13. The fluid control valve of claim 12, wherein, The valve cap is provided with the first opening; the second valve sleeve is provided with the first valve port; the first valve sleeve is provided with the second valve port, the second opening and the third opening.

14. The fluid control valve of any one of claims 1 to 11, wherein, The valve body comprises a valve cap and a valve sleeve; the valve cap is connected with the valve sleeve; the valve cap is provided with the first opening; the valve sleeve is provided with the first valve port, the second valve port, the second opening and the third opening; the second opening is located between the first valve port and the second valve port; the first valve port is located between the first opening and the second opening; the second valve port is located between the second opening and the third opening.

15. The fluid control valve of claim 12, wherein, The inner wall surface of the first valve sleeve is convexly provided with a first stop portion; the inner wall surface of the second valve sleeve is convexly provided with a second stop portion.

16. The fluid control valve of claim 15, wherein, One end of the first elastic member in the fluid control valve abuts against the first stop portion of the first valve sleeve; the other end of the first elastic member abuts against the piston assembly; one end of the second elastic member in the fluid control valve abuts against the second stop portion of the second valve sleeve; the other end of the second elastic member abuts against the piston assembly.

17. A refrigeration system characterized by, Comprise: An apparatus having an inlet and an outlet, a fluid pressure of a fluid flowing out of the apparatus through the outlet being greater than a fluid pressure of a fluid flowing into the apparatus through the inlet; A first fluid control valve according to any one of claims 1 to 16, the second opening of the first fluid control valve being in communication with the inlet; A first heat exchanger and a second heat exchanger; Wherein, the apparatus has a first working condition and a second working condition; The first fluid control valve is arranged in the first heat exchanger; the second fluid control valve is arranged in the second heat exchanger. In the second working condition, the outlet of the device is communicated with 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 communicate the first opening and the second opening; In the first working condition, the outlet of the device is communicated with 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 communicate the third opening and the second opening.

18. The refrigeration system of claim 17, wherein, The first pipeline is arranged between the device and the first heat exchanger, the second pipeline is arranged between the device and the second heat exchanger, and the third pipeline is arranged between the first pipeline and the second pipeline, and the first fluid control valve is arranged in the third pipeline.

19. The refrigeration system of claim 17, wherein, Further comprising: The second fluid control valve is the fluid control valve according to any one of claims 1 to 8; The third heat exchanger is arranged between the second opening of the second fluid control valve and the inlet of the device; In the second working condition, the outlet of the device is communicated with 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 communicate the third opening and the second opening; In the first working condition, the outlet of the device is communicated with 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 communicate the first opening and the second opening.

20. The refrigeration system of claim 19, wherein, The fourth pipeline is arranged between the second heat exchanger and the first heat exchanger, and the second fluid control valve is arranged in the fourth pipeline; The refrigeration system further comprises a fifth pipeline, one end of the fifth pipeline is connected to the part of the fourth pipeline between the second heat exchanger and the second fluid control valve, and the other end of the fifth pipeline is connected to the part of the fourth pipeline between the first heat exchanger and the second fluid control valve.

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