Anti-freeze valve

Abstract

The freeze protection valve includes a valve seat assembly (10) having a first liquid flow passage (111), a second liquid flow passage (112), a mounting cavity (12), a balance passage (14), and a drain passage (18), the drain passage communicating with the first liquid flow passage and the mounting cavity communicating with the second liquid flow passage via the balance passage; a piston (20) that closes or opens the drain passage and has a liquid flow port (21); a valve core assembly including a valve core (30), the valve core being movably disposed within the mounting cavity to close or open the liquid flow port; and a thermostat (50) including a temperature sensing portion (51) and a thermostat push rod (52), the thermostat push rod being used to drive and move the valve core. When the temperature of the medium around the temperature sensor is lower than a predetermined temperature, the thermostat push rod contracts, the valve core moves, opening the liquid flow port, and the medium in the first liquid flow passage pushes the piston away from the drain passage, opening the drain passage. This anti-freeze valve solves the problem of low reliability of the thermostat in opening and closing the valve port in the prior art.

Description

[Technical Field]

[0001] This application claims priority to a patent application entitled "Anti-freeze valve" filed on February 10, 2023 with the State Intellectual Property Office of the People's Republic of China, bearing application number 202310115578.0; a patent application entitled "Anti-freeze valve" filed on February 10, 2023 with the State Intellectual Property Office of the People's Republic of China, bearing application number 202310110772.X; and a patent application entitled "Anti-freeze valve" filed on February 10, 2023 with the State Intellectual Property Office of the People's Republic of China, bearing application number 202320313844.6.

[0002] FIELD OF THE INVENTION This application relates to the technical field of anti-freeze valves, and more particularly to anti-freeze valves. [Background technology]

[0003] Currently, a thermostat is installed within the valve seat of an anti-freeze valve. The thermostat detects the water temperature and controls the opening and closing state of the valve. When the water temperature drops to a predetermined level, the valve opens properly to discharge the water in the pipeline, preventing the water in the pipeline from freezing and causing it to burst.

[0004] However, in conventional technology, the valve core is driven and moved by the extension and contraction movement of the thermostat push rod, which directly opens the valve orifice to drain water. However, because the pushing force of the thermostat push rod is limited, there is a limit to the size of the valve orifice that can be opened. Not only cannot large valve orifices be opened or closed, but the valve cannot be opened or closed at all. This affects the reliability of the drainage of the anti-freeze valve and may even interfere with the normal operation of the anti-freeze valve. Summary of the Invention [Problem to be solved by the invention]

[0005] The main object of the present application is to provide an anti-freeze valve that solves the problem of low reliability in the opening and closing operation of the valve port by the thermostat of the anti-freeze valve in the prior art. [Means for solving the problem]

[0006] In order to achieve the above object, the present application provides a valve seat assembly having a first liquid flow passage, a second liquid flow passage, a mounting cavity, a balance passage, and a drain passage, the first liquid flow passage communicating with the second liquid flow passage, the drain passage communicating with the first liquid flow passage, and the mounting cavity communicating with the second liquid flow passage via the balance passage; a piston movably disposed in the mounting cavity for closing or opening the drain passage, the piston having a liquid flow port which communicates with the drain passage and has a flow area smaller than that of the drain passage; and a valve core, the valve core being disposed in the mounting cavity. and a thermostat connected to a valve seat assembly, the thermostat including a temperature sensing portion and a thermostat push rod, the thermostat push rod being used to drive and move the valve core, wherein when the temperature of the medium around the temperature sensing portion is lower than a predetermined temperature value, the thermostat push rod contracts, causing the valve core to move and open the liquid flow port, and the medium in the first liquid flow passage pushes the piston to move it toward a side away from the liquid drain passage, thereby opening the liquid drain passage.

[0007] By applying the technical solution of the present application, the piston is movably disposed in the mounting cavity to close or open the drain passage, the piston has a liquid flow port, and the liquid flow port is in communication with the drain passage. The valve core is movably disposed in the mounting cavity to close or open the liquid flow port. In this way, under normal operating conditions, liquid can flow through the first liquid flow passage and the second liquid flow passage, and at this time, both the liquid flow port and the drain passage are in a closed state, and liquid in the valve seat assembly cannot flow out through the drain passage. If the temperature of the medium around the temperature sensing part is lower than a predetermined temperature value, the liquid in the anti-freeze valve may freeze. At this time, the thermostat push rod contracts, the valve core moves and opens the liquid flow port. Since the mounting cavity is connected to the second liquid flow passage through the balance passage, the pressure in the upper chamber of the piston decreases. Then, the medium in the first liquid flow passage pushes the piston toward the side away from the drainage passage, and the pressure in the lower chamber of the piston becomes greater than the pressure in the upper chamber of the piston. Due to the pressure difference, the piston moves upward toward the side away from the drainage passage, opening the drainage passage and discharging the liquid.

[0008] Compared to the prior art, which uses only a thermostat push rod to open or close the valve port, the anti-freeze valve of this application uses the pressure difference between the upper and lower chambers of the piston to move the piston up and down, and the piston opens or closes the drainage passage, solving the problem of low reliability of the thermostat's opening and closing of the valve port in the prior art anti-freeze valve and improving the drainage reliability of the drainage passage and the operating reliability of the anti-freeze valve. At the same time, the above-mentioned piston design allows for the opening or closing of large-sized drainage passages, improving the versatility of the anti-freeze valve.

[0009] Preferably, one end of the drain passage extends into the first fluid flow passage.

[0010] Preferably, the valve core assembly further includes a first elastic structure, which is used to apply an elastic force to the valve core to move it toward a side away from the fluid communication port.

[0011] Preferably, the flow area of ​​the balance passage is smaller than the flow area of ​​the liquid flow port.

[0012] Preferably, the piston includes a piston body having a liquid flow port, a communication portion having a first end connected to the piston body and a liquid flow port communicating with the drain passage via the communication portion, and a closing portion connected to a second end of the communication portion and closing or opening the drain passage.

[0013] Preferably, the liquid flow port is a tapered hole, the communicating portion has a straight hole, the liquid flow port communicates with the drain passage via the straight hole, and the diameter of the tapered hole gradually decreases along the direction from the tapered hole toward the straight hole.

[0014] Preferably, the valve seat assembly includes a first valve seat having a first liquid flow passage and a first mounting port, a second valve seat having a second liquid flow passage and connected to the first valve seat, and a valve cover disposed within the first mounting port and connected to both the first valve seat and the second valve seat, the valve cover having a balance passage and a first mounting hole, and a mounting cavity formed by the valve cover and the first valve seat, at least a portion of the piston being slidably disposed within the first mounting hole, the extension direction of the first mounting hole being the same as the sliding direction of the piston.

[0015] Preferably, the valve cover includes a valve cover body having a second mounting hole, a balance passage, and a first mounting hole, in which the thermostat body of the thermostat is disposed and the balance passage is disposed at a distance from the second mounting hole, and a cylindrical structure located in the first mounting hole, in which a first end of the cylindrical structure is connected to the valve cover body, in which at least a portion of the valve core is located in an internal cavity of the cylindrical structure, and in which the internal cavity communicates with both the balance passage and the second mounting hole.

[0016] Preferably, the valve cover further includes a locking structure provided at the second end of the cylindrical structure, the locking structure having a through hole, the through hole being used to pass the valve core, and the locking structure being used to position and lock the first elastic structure.

[0017] Preferably, the second valve seat has a second mounting port, at least a portion of the valve cover extends into the second mounting port, the second liquid flow passage communicates with the balance passage through the second mounting port, and the anti-freeze valve further includes a first sealing structure arranged between the valve cover and the first mounting port, or a second sealing structure arranged between the valve cover and the second mounting port, or the first sealing structure arranged between the valve cover and the first mounting port and a second sealing structure arranged between the valve cover and the second mounting port.

[0018] Preferably, there is one balance passage located on one side of the second mounting hole, or there are multiple balance passages arranged at intervals in the circumferential direction surrounding the second mounting hole.

[0019] Preferably, the inner hole of the drain passage is a drain portion, and the anti-freeze valve further includes a second elastic structure used to apply an elastic force to the piston to move it toward a side away from the drain portion.

[0020] Preferably, the valve core assembly further includes a first elastic structure, which is used to apply an elastic force to the valve core to move it away from the fluid flow port and an elastic force to move the piston towards the drainage section.

[0021] Preferably, the first elastic structure is a first spring and the second elastic structure is a second spring, the stiffness coefficient of the first spring being greater than the stiffness coefficient of the second spring.

[0022] Preferably, the cross section of the drainage passage is circular with a diameter of 10 mm or more.

[0023] Preferably, the valve seat assembly further has a communication passage arranged to form an included angle with both the first liquid flow passage and the second liquid flow passage, the first liquid flow passage communicates with the second liquid flow passage via the communication passage, and the communication passage and the drain passage are positioned offset from each other.

[0024] Preferably, the valve seat assembly includes a first valve seat and a second valve seat, the first valve seat having a first liquid flow passage and a first attachment port, the second valve seat having a second liquid flow passage, the first valve seat and the second valve seat being connected to each other, the communication passage including a first sub-communication passage and a second sub-communication passage, the first valve seat being a first cylinder body having a first attachment port, the liquid discharge passage being located within the first cylinder body and being connected to an inner wall of the first cylinder body A position control space is formed, and the position control space includes a first cylinder body used to position and lock the second elastic structure, a second cylinder body connected to the second valve seat, the internal cavity of which forms a first sub-communication passage, and a first pipe body inserted into the first cylinder body and the second cylinder body, the internal cavity of which is a first liquid flow passage.

[0025] Preferably, the second valve seat includes: a second pipe body, an internal cavity of which is the second liquid flow passage; a third cylinder body provided in the second pipe body and communicating with the second liquid flow passage, the third cylinder body having a second mounting port; and a fourth cylinder body provided in the second pipe body and communicating with the second liquid flow passage, the internal cavity of which forms a second sub-communication passage and communicates with the second cylinder body, wherein the first cylinder body is disposed opposite to and connected to the third cylinder body, and the second cylinder body is disposed opposite to and connected to the fourth cylinder body.

[0026] Preferably, the anti-freeze valve further includes a third sealing structure arranged at the connection point between the second cylinder body and the fourth cylinder body, and the third sealing structure is arranged between the end face of the second cylinder body and the end face of the fourth cylinder body.

[0027] The drawings in the specification that form a part of this application are provided to facilitate a better understanding of the application, and the schematic examples and descriptions thereof are for the purpose of interpreting the application and are not intended to unduly limit the application. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a cross-sectional view of a freeze prevention valve according to a first embodiment of the present invention in an open state. [Figure 2] 2 shows a cross-sectional view of the valve cover of the anti-freeze valve in FIG. 1. [Figure 3] Figure 1 shows a schematic diagram of the three-dimensional structure of the anti-freeze valve. [Figure 4] FIG. 4 shows a side view of the anti-freeze valve in FIG. [Figure 5] 2 shows a cross-sectional view of the valve core of the freeze prevention valve in FIG. 1. [Figure 6] 2 shows a cross-sectional view of the piston of the anti-freeze valve in FIG. 1. [Figure 7] 10 is a cross-sectional view of a freeze prevention valve according to a second embodiment of the present invention in an open state. [Figure 8] 8 is a cross-sectional view of the anti-freeze valve in FIG. 7 in a closed state. [Figure 9] 8 shows a cross-sectional view of the valve cover of the anti-freeze valve in FIG. 7. [Figure 10] 8 is a schematic diagram showing the three-dimensional structure of the second valve seat of the freeze prevention valve in FIG. 7. [Figure 11] 8 is a schematic diagram showing the three-dimensional structure of the first valve seat of the freeze prevention valve in FIG. 7. [Figure 12] 8 shows a cross-sectional view of a first valve seat of the anti-freeze valve in FIG. 7. [Figure 13] 8 shows a cross-sectional view of the second valve seat of the anti-freeze valve in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0029] It should be noted that the examples and features in the examples in the present application can be combined with each other unless they are inconsistent.The present invention will now be described in detail with reference to the accompanying drawings in conjunction with the embodiments.

[0030] It should be noted that all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, unless otherwise defined.

[0031] In this application, unless otherwise specified, directional terms such as "upper, lower" are generally used with respect to the directions shown in the accompanying drawings or the longitudinal, vertical or gravitational direction; similarly, for ease of understanding and explanation, "left, right" are generally used with respect to the left and right shown in the accompanying drawings, and "inner, outer" refer to the inside and outside with respect to the contours of each part itself; however, the above directional terms are not intended to limit this application.

[0032] SUMMARY OF THE INVENTION In order to solve the problem of low reliability of the opening and closing operation of the valve port by the thermostat of the freeze prevention valve in the prior art, the present application provides a freeze prevention valve.

[0033] Example 1 1 to 6 , the freeze protection valve includes a valve seat assembly 10, a piston 20, a valve core assembly, and a thermostat 50. The valve seat assembly 10 has a first liquid flow passage 111, a second liquid flow passage 112, a mounting cavity 12, a balance passage 14, and a drain passage 18, where the first liquid flow passage 111 communicates with the second liquid flow passage 112, the drain passage 18 communicates with the first liquid flow passage 111, and the mounting cavity 12 communicates with the second liquid flow passage 112 via the balance passage 14. The piston 20 is movably disposed within the mounting cavity 12 to close or open the drain passage 18, and has a liquid flow port 21 that communicates with the drain passage 18, the flow area of ​​which is smaller than the flow area of ​​the drain passage 18. The valve core assembly includes a valve core 30, which is movably disposed in the mounting cavity 12 to close or open the liquid flow port 21. A thermostat 50 is connected to the valve seat assembly 10, and includes a temperature sensing portion 51 and a thermostat push rod 52, which is used to drive and move the valve core 30. When the temperature of the medium around the temperature sensing portion 51 is lower than a predetermined temperature value, the thermostat push rod 52 contracts, causing the valve core 30 to move and open the liquid flow port 21, and the medium in the first liquid flow passage 111 pushes the piston 20 away from the liquid drainage passage 18 to open the liquid drainage passage 18.

[0034] By applying the technical solution of this embodiment, the piston 20 is movably disposed in the mounting cavity 12 to close or open the drain passage 18, and the piston 20 has a liquid flow port 21, which communicates with the drain passage 18. The valve core 30 is movably disposed in the mounting cavity 12 to close or open the liquid flow port 21. In this way, under normal operating conditions, liquid can flow through the first liquid flow passage 111 and the second liquid flow passage 112, and at this time, the liquid flow port 21 and the drain passage 18 are both in a closed state, and the liquid in the valve seat assembly cannot flow out through the drain passage 18. If the temperature of the medium around the temperature sensing part 51 is lower than a predetermined temperature value, the liquid in the anti-freeze valve may freeze. At this time, the thermostat push rod contracts, the valve core 30 moves and opens the liquid flow port 21, and the mounting cavity 12 communicates with the second liquid flow passage 112 through the balance passage 14, causing the pressure in the upper chamber of the piston to decrease. Then, the medium in the first liquid flow passage 111 pushes the piston 20 toward the side away from the drainage passage, and the pressure in the lower chamber of the piston becomes greater than the pressure in the upper chamber of the piston. Due to the pressure difference, the piston 20 moves upward toward the side away from the drainage passage 18, opening the drainage passage 18 and discharging the liquid.

[0035] Compared to the prior art in which the valve port is opened or closed solely by a thermostat push rod, the anti-freeze valve of this embodiment uses the pressure difference between the piston's upper and lower chambers to cause the piston 20 to rise and fall, and uses the piston 20 to open or close the drain passage 18, thereby solving the prior art problem of low reliability in the thermostat-based opening and closing of the valve port in anti-freeze valves and improving the drain reliability of the drain passage 18 and the operating reliability of the anti-freeze valve. At the same time, the above design of the piston 20 makes it possible to close or open a large-sized drain passage 18, improving the versatility of the anti-freeze valve.

[0036] In this embodiment, one end of the drainage passage 18 extends into the first liquid flow passage 111 . The interior of first liquid flow passage 111 is for allowing circulating water to flow, and drain passage 18 is located within first liquid flow passage 111, bringing drain passage 18 closer to the location of the circulating water. In this way, when the anti-freeze valve is in a low-temperature environment, the above design reduces the temperature difference between drain passage 18 and the circulating water, solving the problem of anti-freeze valves being prone to freezing or icing at the valve opening in conventional technology. This prevents drain passage 18 from freezing even at lower circulating water temperatures, and also makes the anti-freeze valve more adaptable to lower environmental temperatures, improving its versatility.

[0037] In this embodiment, the first liquid flow path 111 and the second liquid flow path 112 form the liquid flow section 11 .

[0038] In this embodiment, at least a part of the temperature sensing portion 51 is embedded in the second liquid flow passage 112 .

[0039] 1, the valve core assembly further includes a first elastic structure 40. The first elastic structure 40 is used to apply an elastic force to the valve core 30, causing it to move away from the liquid flow port 21. In this way, when the temperature of the medium around the temperature sensing portion 51 is lower than a predetermined temperature value, the thermostat push rod 52 contracts, causing the first elastic structure 40 to drive and move the valve core 30, opening the liquid flow port 21. The medium in the first liquid flow passage 111 pushes the piston 20, causing it to move away from the liquid drain passage 18, thereby opening the liquid drain passage 18.

[0040] Specifically, under normal operating conditions, liquid can flow through the first liquid flow passage 111 and the second liquid flow passage 112, and at this time, the liquid flow port 21 and the drain passage 18 are both in a closed state, the first elastic structure 40 is in a compressed state, and liquid in the valve seat assembly cannot flow out through the drain passage 18. If the temperature sensing unit 51 of the thermostat 50 detects that the temperature in the second liquid flow passage 112 is lower than a predetermined temperature value, the liquid in the anti-freeze valve may freeze. At this time, the first elastic structure 40 drives and moves the valve core 30 by the action of its own elastic force, opening the liquid flow port 21. The mounting cavity 12 becomes connected to the second liquid flow passage 112 via the balance passage 14, and the pressure in the upper cavity of the piston decreases. Then, the medium in the first liquid flow passage 111 pushes the piston 20 toward the side away from the drainage passage 18, so that the pressure in the lower chamber of the piston becomes greater than the pressure in the upper chamber of the piston. Due to the pressure difference, the piston 20 moves upward toward the side away from the drainage passage 18, opening the drainage passage 18 and discharging the liquid.

[0041] Optionally, the first resilient structure 40 is a spring.

[0042] In this embodiment, when the temperature in the second liquid flow passage 112 is equal to or higher than a predetermined temperature value, the thermostat push rod 52 pushes the valve core 30 to close the liquid flow port 21, and the medium in the second liquid flow passage 112 passes through the balance passage 14 and enters the mounting cavity 12, pushing the piston 20 to move toward the drain passage 18 and closing it. Thus, when the temperature in the second liquid flow passage 112 is above a predetermined temperature value, the liquid in the first liquid flow passage 111 and the second liquid flow passage 112 can flow normally, and at this time the thermostat push rod 52 is in an extended state, pushing the valve core 30 toward the liquid flow port 21 and closing it. Since the mounting cavity 12 is connected to the second liquid flow passage 112 through the balance passage 14, the pressure in the upper chamber of the piston becomes greater than the pressure in the lower chamber of the piston, and the piston 20 moves toward the drain passage 18 due to the pressure difference, closing the drain passage 18 and ensuring that the anti-freeze valve can flow liquid normally.

[0043] Optionally, the predetermined temperature value is greater than or equal to 3°C and less than or equal to 5°C.

[0044] In this embodiment, the cross section of the drainage passage 18 is circular, and the diameter of the drainage passage 18 is 10 mm or more.

[0045] Optionally, the flow area of ​​balance passage 14 is smaller than the flow area of ​​liquid flow port 21. In this way, the above design ensures that liquid can be smoothly discharged to the outside of the anti-freeze valve through drain passage 18, improving the drainage efficiency of the anti-freeze valve, and prevents liquid from accumulating inside piston 20 and obstructing the opening of drain passage 18, further improving the operational reliability of the anti-freeze valve.

[0046] In this embodiment, the liquid flow port 21 is a circular port, the diameter of the drain passage 18 is larger than the diameter of the circular port, the flow capacity of the balance passage 14 is smaller than the flow capacity of the liquid flow port 21, and the flow capacity of the drain passage 18 is larger than the flow capacity of the liquid flow port 21, which not only improves the smoothness of the flow of liquid within the anti-freeze valve but also improves the operational reliability of the anti-freeze valve.

[0047] 6, piston 20 includes a piston body 22, a communication portion 23, and a closing portion 24. Piston body 22 has a liquid communication port 21. A first end of communication portion 23 is connected to piston body 22, and liquid communication port 21 communicates with drainage passage 18 via communication portion 23. The second end of the communicating portion 23 is connected to the closing portion 24, which is used to close or open the drainage passage 18. When the temperature in the second liquid passage 112 is lower than a predetermined temperature, the valve core 30 opens the liquid flow port 21, which then communicates with the drainage passage 18 via the communicating portion 23. This causes the pressure in the upper chamber of the piston to be lower than the pressure in the lower chamber of the piston. The piston 20 then moves upward due to the pressure difference between the upper and lower chambers, opening the drainage passage 18. This allows the anti-freeze valve to discharge liquid and prevent it from freezing. At the same time, the above design makes the piston 20 simpler in structure and easier to process and implement, reducing the cost and difficulty of processing the piston 20.

[0048] Specifically, the communicating portion 23 is cylindrical and both ends are connected to the piston body 22 and the closing portion 24, respectively, and the valve core 30 is slidably arranged within the piston body 22 to open or close the liquid flow port 21.

[0049] In this embodiment, the liquid circulation port 21 is a tapered hole, the communication portion 23 has a straight hole, the liquid circulation port 21 communicates with the drainage passage 18 via the straight hole, and the diameter of the tapered hole gradually decreases in the direction from the tapered hole to the straight hole. As described above, with the above design, on the one hand, the diameter of the liquid circulation port 21 at one end adjacent to the valve core 30 is larger than the diameter of the valve core 30, making it easier for the valve core 30 to enter the liquid circulation port 21 and reducing the difficulty of closing the freeze prevention valve; on the other hand, when the liquid circulation port 21 is in an open state, the tapered hole increases the flow rate of the fluid medium, thereby increasing the liquid circulation speed at the liquid circulation port 21.

[0050] Optionally, the valve core 30 includes an insert segment at the end of the valve core 30, which closes the liquid flow port 21 when at least a portion of the insert segment is inserted into the straight hole. The insert segment has a cylindrical structure that fits into the straight hole to close the liquid flow port 21. When closing the liquid flow port 21, the valve core 30 is not restricted in its downward position, so that fluctuations in the movement of the thermostat push rod 52 do not affect the closing reliability of the valve core 30. As a result, the anti-freeze valve can be fitted with thermostats 50 of various specifications, and the difficulty of processing the anti-freeze valve is reduced.

[0051] 1 and 2 , the valve seat assembly 10 further includes a communication passage 113, which is disposed so as to form an included angle with both the first liquid flow passage 111 and the second liquid flow passage 112, and the first liquid flow passage 111 communicates with the second liquid flow passage 112 via the communication passage 113. The communication passage 113 and the drain passage 18 are disposed so as to be offset from each other. Specifically, the circulating water that has entered the first liquid flow passage 111 can communicate with the second liquid flow passage 112 via the communication passage 113, or the circulating water that has entered the second liquid flow passage 112 can communicate with the first liquid flow passage 111 via the communication passage 113, thereby ensuring smooth flow of the circulating water through the first liquid flow passage 111 and the second liquid flow passage 112. When the temperature in the second liquid flow passage 112 is lower than a predetermined temperature value, the drain passage 18 is used to discharge the circulating water, preventing freezing inside the anti-freeze valve. In this way, the above design prevents interference between the circulating water in the communication passage 113 and the drain passage 18, which would hinder normal operation of the anti-freeze valve.

[0052] Optionally, the angle between the communication passage 113 and the first liquid flow passage 111 is 90°, and the angle between the communication passage 113 and the second liquid flow passage 112 is 90°. The communication passage 113 and the drain passage 18 are arranged parallel to each other and are located on either side of the first liquid flow passage 111, respectively.

[0053] As shown in Figures 1, 2, 3, and 4, the valve seat assembly 10 includes a first valve seat 15, a second valve seat 16, and a valve cover 17. The first valve seat 15 has a first liquid flow passage 111 and a first mounting port 151. The second valve seat 16 has a second liquid flow passage 112, connecting the first valve seat 15 and the second valve seat 16. The valve cover 17 is disposed within the first mounting port 151 and connects to both the first valve seat 15 and the second valve seat 16. The valve cover 17 has a balance passage 14 and a first mounting hole 171. The mounting cavity 12 is formed by the valve cover 17 and the first valve seat 15. At least a portion of the piston 20 is slidably disposed within the first mounting hole 171, and the extension direction of the first mounting hole 171 is the same as the sliding direction of the piston 20. In this way, the valve cover 17 is connected to both the first valve seat 15 and the second valve seat 16, and is surrounded by the valve cover 17 and the first valve seat 15 to form the mounting cavity 12, and the piston 20 is located within the mounting cavity 12 and can slide within the first mounting hole 171 of the valve cover 17. This, on the one hand, makes the layout of the internal structure of the valve seat assembly 10 more rational, improves the utilization of the internal space of the valve seat assembly 10, and prevents the piston 20, valve core 30, and thermostat 50 from interfering with the normal flow of liquid in the first liquid flow passage 111 and the second liquid flow passage 112. On the other hand, the structure of the valve seat assembly 10 is simpler, making it easier to process and realize, and reducing the processing costs and difficulty of the anti-freeze valve.

[0054] In this embodiment, the first valve seat 15 and the second valve seat 16 are arranged opposite each other, the first liquid flow passage 111 and the second liquid flow passage 112 are arranged parallel to each other and the interior is used to flow circulating water, and the drain passage 18 is located within the first liquid flow passage 111, so that the drain passage 18 is closer to the position of the circulating water and the temperature difference between the drain passage 18 and the circulating water in a low-temperature environment is reduced, and the drain passage 18 will not freeze even at lower circulating water temperatures, making it possible to accommodate lower circulating water temperatures and lower environmental temperatures.

[0055] 2, the valve cover 17 includes a valve cover body 173 and a cylindrical structure 174. The valve cover body 173 has a second mounting hole 172, a balance passage 14, and a first mounting hole 171. The thermostat body 53 of the thermostat 50 is disposed in the second mounting hole 172, and the balance passage 14 and the second mounting hole 172 are disposed at a distance from each other. The cylindrical structure 174 is disposed in the first mounting hole 171, and a first end of the cylindrical structure 174 is connected to the valve cover body 173. At least a portion of the valve core 30 is disposed within an internal cavity of the cylindrical structure 174, and the internal cavity is in communication with both the balance passage 14 and the second mounting hole 172. In this way, an annular space is formed between the valve cover 173 and the cylindrical structure 174, the piston body 22 is located in the annular space, and the valve core 30 is arranged to be able to rise and fall within the cylindrical structure 174. When liquid enters the cylindrical structure 174 through the balance passage 14, the above design can quickly increase the pressure in the upper chamber of the piston, pushing the piston 20 to quickly move toward the drain passage 18 and closing it, improving the closing efficiency of the anti-freeze valve. At the same time, the above design makes the structure of the valve cover 17 simpler and easier to process and implement, reducing the processing costs and difficulty of the anti-freeze valve.

[0056] In this embodiment, the thermostat body 53 is threaded into the second mounting hole 172 to attach the thermostat 50 to the valve cover 17. This, on the one hand, makes it easy to attach and detach the two, and on the other hand, prevents the thermostat body 53 from moving or swinging within the valve seat assembly 10, which would affect the structural stability of the freeze prevention valve. The valve core 30 has a first perforated segment 31 and a second perforated segment 32 that communicate with each other. The inner diameter of the first perforated segment 31 is larger than the inner diameter of the second perforated segment 32, and a stepped surface is formed at the connection point between the first perforated segment 31 and the second perforated segment 32. The stepped surface is used to position and lock the thermostat body 53. The end face of the thermostat push rod 52 away from the thermostat body 53 abuts against the bottom surface of the second perforated segment 32, thereby pressing the valve core 30 and closing the liquid flow port 21. Thus, with the above design, on the one hand, the step surface formed at the connection point between the first perforated segment 31 and the second perforated segment 32 restricts and locks the position of the thermostat body 53, thereby restricting the position of the valve core 30 and ensuring an appropriate opening degree of the liquid flow port 21; on the other hand, the thermostat push rod 52 presses against the bottom surface of the second perforated segment 32, driving and moving the valve core 30, thereby realizing the closing function of the valve core 30.

[0057] Specifically, at least a portion of the thermostat body 53 enters the first perforated segment 31 and slides along the extension direction of the first perforated segment 31. In this way, the second perforated segment 32 regulates the sliding direction of the thermostat body 53, and thus the moving direction of the thermostat push rod 52. The thermostat push rod 52 cooperates with the valve core 30 to achieve internal positioning of the valve core 30, ensuring that the valve core 30 moves into and closes the fluid flow port 21, thereby improving the sliding reliability of the thermostat body 53.

[0058] Optionally, the outer diameter of the thermostat body 53 corresponds to the inner diameter of the first perforated segment 31, and the end of the thermostat push rod 52 remote from the thermostat body 53 is an enlarged segment, the outer diameter of which corresponds to the second perforated segment 32. Thus, with the above design, the thermostat push rod 52 and the thermostat body 53 together achieve the function of guiding and positioning the valve core 30, that is, the thermostat 50 is positioned with the valve core 30 at two points, which improves the stability of the movement of the valve core 30.

[0059] Optionally, first mounting hole 171 is coaxially positioned with second mounting hole 172 .

[0060] As shown in FIG. 1 , the valve cover 17 further includes a locking structure 175. The locking structure 175 is disposed at the second end of the cylindrical structure 174. The locking structure 175 has a through-hole 1751, which is used to pass the valve core 30 through and to position and lock the first elastic structure 40. Optionally, the first elastic structure 40 is a spring. In this manner, the locking structure 175 positions and locks the first elastic structure 40, ensuring that the spring is in a compressed state when the valve core 30 closes the fluid communication port 21. At the same time, the above design further increases the pressure in the upper chamber of the piston, ensuring that the pressure in the upper chamber of the piston is greater than the pressure in the lower chamber of the piston when the valve core 30 closes the fluid communication port 21, pushing the piston 20 toward the drainage passage 18 and closing the drainage passage 18.

[0061] Optionally, the second valve seat 16 has a second mounting port 164, at least a portion of the valve cover 17 extends into the second mounting port 164, and the second liquid flow passage 112 communicates with the balance passage 14 via the second mounting port 164. The anti-freeze valve further includes a first sealing structure 300 and / or a second sealing structure 400, where the first sealing structure 300 is disposed between the valve cover 17 and the first mounting port 151, and the second sealing structure 400 is disposed between the valve cover 17 and the second mounting port 164. In this manner, the valve cover 17 is connected to both the first valve seat 15 and the second valve seat 16. The above-described design of the first sealing structure 300 and / or the second sealing structure 400 improves the sealing performance of the anti-freeze valve and prevents liquid leakage at the connection points between the valve cover 17 and the first valve seat 15 and / or the second valve seat 16.

[0062] In this embodiment, the anti-freeze valve further includes a first sealing structure 300 and a second sealing structure 400, where the first sealing structure 300 is arranged at the connection point between the valve cover 17 and the first valve seat 15, and the second sealing structure 400 is arranged at the connection point between the valve cover 17 and the second valve seat 16, thereby improving the sealing performance of the connection points between the valve cover 17 and the first valve seat 15 and the second valve seat 16.

[0063] Optionally, the first sealing structure 300 is a seal ring.

[0064] Optionally, the second sealing structure 400 is a seal ring.

[0065] Optionally, there may be one balance passage 14 located on one side of the second mounting hole 172, or there may be multiple balance passages 14 located at intervals in the circumferential direction surrounding the second mounting hole 172. In this way, the above design makes the selection of the number of balance passages 14 more flexible and diverse, which can adapt to different operating conditions and usage demands, and also improves the flexibility of processing by operators.

[0066] Optionally, the total flow area of ​​all balance passages 14 is greater than the flow area of ​​the liquid flow ports 21. In this way, the above design allows the flow rate of the balance passages 14 to be greater than the flow rate of the liquid flow ports 21, making it possible to accommodate larger sized liquid flow ports 21, thereby improving the versatility of the anti-freeze valve.

[0067] In this embodiment, the operation principle of the anti-freeze valve is as follows.

[0068] When the temperature inside the liquid flow passage is higher than the valve closing temperature (3 to 5°C), the thermostat push rod 52 extends, pushing and moving the valve core 30, which then pushes back against the spring force of the first elastic structure 40, causing the O-ring in the valve core 30 to come into contact with the liquid flow port 21 of the piston 20 and close the liquid flow port 21. At this time, the first elastic structure 40 is compressed, so that the upper cavity of the piston becomes a high-pressure chamber. At this time, the area below the piston 20 is connected to the liquid drainage passage 18 and becomes a low-pressure area, causing a downward differential pressure to be generated on the piston 20. Due to the action of this downward differential pressure, the piston 20 moves downward, closing the liquid drainage passage 18 and realizing the closing of the anti-freeze valve.

[0069] When the temperature of the liquid flow passage is lower than the valve opening temperature (0 to 3°C), the thermostat push rod 52 shortens, and the valve core 30 moves upward due to the action of the elastic force of the first elastic structure 40, as the differential pressure at the liquid flow port 21 is eliminated, opening the liquid flow port 21. At this time, the upper chamber of the piston is connected to the drainage passage 18 via the liquid flow port 21, so the pressure drops and it becomes a low-pressure chamber. However, at this time, the area below the piston remains in a high-pressure region because it is connected to the first liquid flow passage 111 but not to the drainage passage 18, and the pressure below the piston becomes greater than the pressure above the piston. As a result, the piston 20 moves upward in response to the upward differential pressure, opening the drainage passage 18 and allowing a large flow rate of water to be discharged through the drainage passage 18.

[0070] Example 2 The difference between the antifreeze valve of the second embodiment and the antifreeze valve of the first embodiment is that the structure of the antifreeze valve is different.

[0071] 7 to 13, the inner bore of the drain passage 18 is the drain portion 13, and the freeze prevention valve further includes a second elastic structure 200, which is used to apply an elastic force to the piston 20 to move it away from the drain portion 13. Specifically, under normal operating conditions, liquid can flow through the liquid flow portion 11, and at this time, the liquid flow port 21 and the drain portion 13 are both in a closed state, and the first elastic structure 40 and the second elastic structure 200 are both in a compressed state, so that liquid in the valve seat assembly cannot flow out through the drain portion 13. If the temperature of the medium around the temperature sensing part 51 is lower than a predetermined temperature value, the liquid in the anti-freeze valve may freeze, at which point the thermostat push rod 52 contracts, the first elastic structure 40 uses its own elastic force to drive the valve core 30, moving it upward away from the liquid flow port 21 and opening the liquid flow port 21, and the second elastic structure 200 uses its own elastic force to push the piston 20, moving it upward away from the liquid drainage part 13 and opening the liquid drainage part 13 to discharge the liquid.

[0072] In this embodiment, the piston body 22 has a storage space 221 and a fluid communication port 21 that are connected to each other, and at least a portion of the valve core 30 is located in the storage space 221. The piston body 22 further has a position restriction recess 222, and at least a portion of the second elastic structure 200 is received in and restrictedly engaged with the position restriction recess 222. In this way, when the temperature in the second fluid communication passage 112 is lower than a predetermined temperature value, the valve core 30 opens the fluid communication port 21, which then communicates with the drain passage 18 via the communication portion 23, ensuring that the pressure in the upper chamber of the piston is lower than the pressure in the lower chamber of the piston. The piston 20 moves upward due to the combined action of the pressure difference between the upper chamber and the lower chamber of the piston and the elastic force of the second elastic structure 200, opening the drain passage 18. This allows the anti-freeze valve to discharge fluid and prevents the fluid from freezing within the anti-freeze valve. At the same time, the above design makes the structure of the piston 20 simpler, easier to process and realize, and reduces the processing cost and difficulty of the piston 20.

[0073] In this embodiment, the position control recess 222 is used to positionally lock the second elastic structure 200, ensuring that the direction of the elastic force of the second elastic structure 200 is the same as the movement direction of the valve core 30, thereby ensuring that the movement direction of the valve core 30 is the same as the movement direction of the piston 20.

[0074] In this embodiment, both ends of the first elastic structure 40 abut against the valve core 30 and the piston 20, respectively, and are used to apply an elastic force to the valve core 30 to move it away from the liquid flow port 21, and an elastic force to move the piston 20 towards the drainage section 13.

[0075] In this embodiment, the first elastic structure 40 is a first spring, and the second elastic structure 200 is a second spring, with the stiffness coefficient of the first spring being greater than that of the second spring. Thus, when the temperature in the fluid flow section 11 is lower than a predetermined temperature value, the above design ensures that the elastic force of the first spring is smaller than that of the second spring, so that the second elastic structure 200 and the medium in the fluid flow section 11 jointly push the piston 20 away from the drain section 13, thereby opening the drain section 13. At the same time, the above design makes the structures of the first elastic structure 40 and the second elastic structure 200 simpler, easier to process and implement, and reduces the processing costs of the anti-freeze valve.

[0076] Optionally, the cross section of drain passage 18 is a circle with a diameter of 10 mm or more. In this way, the above design enables the anti-freeze valve to have a large valve opening, allowing the liquid in liquid flow section 11 to be quickly discharged from drain section 13, thereby realizing rapid drainage of the anti-freeze valve and improving the drainage efficiency of the anti-freeze valve.

[0077] 12 and 13 , the communication passage 113 includes a first sub-communication passage 1131 and a second sub-communication passage 1132, and the first valve seat 15 includes a first cylinder body 152, a second cylinder body 153, and a first pipe body 154. The first cylinder body 152 has a first mounting port 151, and the drain passage 18 is located within the first cylinder body 152 and forms a position restriction space with the cylinder inner wall of the first cylinder body 152, which is used to position and lock the second elastic structure 200. The second pipe body 153 is connected to the second valve seat 16, and the internal cavity of the second cylinder body 153 forms the first sub-communication passage 1131. The first pipe 154 is inserted into the first cylinder 152 and the second cylinder 153, and the internal cavity of the first pipe 154 is the first liquid passage 111. Thus, at least a portion of the thermostat 50 is inserted into the first cylinder 152, and the first cylinder 152 communicates with the second cylinder 153 via the first pipe 154. This ensures that the thermostat 50, piston 20, and valve core 30 do not affect the normal flow of the medium in the liquid passage, improving the transport efficiency of the anti-freeze valve. At the same time, the above design ensures that the drain passage 18 is located within the first liquid passage 111, bringing the drain passage 18 closer to the circulating water. This reduces the temperature difference between the drain passage 18 and the circulating water in low-temperature environments, preventing the drain passage 18 from freezing even at lower circulating water temperatures. This allows for lower circulating water temperatures and lower ambient temperatures.

[0078] 10 , the second valve seat 16 includes a second pipe body 161, a third cylinder body 162, and a fourth cylinder body 163. The internal cavity of the second pipe body 161 is the second liquid flow passage 112, the third cylinder body 162 is disposed in the second pipe body 161 and communicates with the second liquid flow passage 112, and the third cylinder body 162 has a second mounting port 164. The fourth cylinder body 163 is disposed in the second pipe body 161 and communicates with the second liquid flow passage 112, and the internal cavity of the fourth cylinder body 163 forms a second sub-communication passage 1132 and communicates with the second cylinder body 153. The first cylinder body 152 is disposed opposite to and connected to the third cylinder body 162, and the second cylinder body 153 is disposed opposite to and connected to the fourth cylinder body 163. In this way, the temperature sensing part 51 is inserted into the third cylinder body 162, the first liquid flow passage 111 communicates with the second liquid flow passage 112 via the fourth cylinder body 163, and the third cylinder body 162 communicates with the fourth cylinder body 163 via the second pipe body 161, thereby ensuring that the thermostat 50 does not affect the normal flow of the medium in the liquid flow part 11 and improving the transportation efficiency of the anti-freeze valve. At the same time, the above design makes the structure of the second valve seat 16 simpler, making it easier to process and realize, and reducing the processing costs of the second valve seat 16.

[0079] In this embodiment, the third cylinder body 162 and the fourth cylinder body 163 are arranged parallel to each other, and the third cylinder body 162 and the second pipe body 161 are arranged perpendicular to each other.

[0080] As shown in FIG. 7 , the freeze prevention valve further includes a third sealing structure 600. The third sealing structure 600 is disposed at the connection between the second cylinder body 153 and the fourth cylinder body 163. The second sealing structure 400 is disposed between the outer wall of the valve cover 17 and the inner wall of the second mounting port 164, and the third sealing structure 600 is disposed between the end face of the second cylinder body 153 and the end face of the fourth cylinder body 163. The above design of the third sealing structure 600 improves the sealing performance of the connection between the second cylinder body 153 and the fourth cylinder body 163 and prevents leakage. At the same time, the second sealing structure is a radial seal, while the third sealing structure is a planar seal, thereby reducing the requirements for the positioning accuracy of the two holes.

[0081] Optionally, the third sealing structure 600 is a seal ring.

[0082] From the above description, it can be seen that the above-described embodiments of the present application have the following technical effects.

[0083] The piston is movably disposed within the mounting cavity to close or open the drain passage, and the piston has a fluid flow port that communicates with the drain passage. The valve core is movably disposed within the mounting cavity to close or open the fluid flow port. Thus, under normal operating conditions, fluid can flow through the first fluid flow passage and the second fluid flow passage, and both the fluid flow port and the drain passage are closed, preventing fluid within the valve seat assembly from flowing out through the drain passage. If the temperature of the medium around the temperature sensing part is lower than a predetermined temperature value, the liquid in the anti-freeze valve may freeze. At this time, the thermostat push rod contracts, the valve core moves and opens the liquid flow port. Since the mounting cavity is connected to the second liquid flow passage through the balance passage, the pressure in the upper cavity of the piston decreases. At this time, the medium in the first liquid flow passage pushes the piston to move away from the drainage passage, and the pressure in the lower cavity of the piston becomes greater than the pressure in the upper cavity of the piston. Due to the pressure difference, the piston moves upward toward the side away from the drainage passage, opening the drainage passage and discharging the liquid.

[0084] Compared to the prior art, which uses only a thermostat push rod to open or close the valve port, the anti-freeze valve of this application uses the pressure difference between the upper and lower chambers of the piston to move the piston up and down, and the piston opens or closes the drainage passage, solving the problem of low reliability of the thermostat's opening and closing of the valve port in the prior art anti-freeze valve and improving the drainage reliability of the drainage passage and the operating reliability of the anti-freeze valve. At the same time, the above-mentioned piston design allows for the opening or closing of large-sized drainage passages, improving the versatility of the anti-freeze valve.

[0085] It is apparent that the above-described embodiments are only some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, any other embodiments that a person skilled in the art can obtain without any creative effort should fall within the scope of protection of the present application.

[0086] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise. It should further be understood that when the terms "comprise" and / or "comprises" are used herein, it means that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0087] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and in the above-mentioned accompanying drawings are used to distinguish between similar objects and are not necessarily used to describe a particular order or sequence. Data used in this manner are interchangeable where appropriate, and it should be understood that the embodiments of the application described herein may be implemented in orders other than those illustrated or described herein.

[0088] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0089] The drawings include the following reference numbers: [Explanation of symbols]

[0090] 10 Valve seat assembly 11 Liquid flow section 111 First liquid flow path 112 second liquid flow path 113 Communication passage 12 Mounting cavity 13 Drainage section 1131 First sub-communication passage 1132 Second sub-communication passage 14 Balanced Passage 15 First valve seat 151 First access point 152 first cylinder body 153 Second cylinder body 154 First Pipe Body 16 Second valve seat 161 Second pipe body 162 Third cylinder body 163 Fourth Cylinder Body 164 Second access port 17 Operculum 171 First mounting hole 172 Second mounting hole 173 Valve cover body 174 Cylindrical Structure 175 Locking structure 1751 Through hole 18 Drainage passage 20 pistons 21 Liquid flow port 22 Piston body 221 Storage Space 222 Position control recess 23 Communication part 24 Occlusion 30 Valve core 31 First perforated segment 32 Second holed segment 40 First elastic structure 50 Thermostat 51 Temperature sensing part 52 Thermostat push rod 53 Thermostat body 200 Second Elastic Structure 300 First sealing structure 400 Second sealing structure 600 Third Sealing Structure

Claims

1. a valve seat assembly (10) having a first liquid flow passage (111), a second liquid flow passage (112), a mounting cavity (12), a balance passage (14), and a drain passage (18), wherein the first liquid flow passage (111) communicates with the second liquid flow passage (112), the drain passage (18) communicates with the first liquid flow passage (111), and the mounting cavity (12) communicates with the second liquid flow passage (112) via the balance passage (14); a piston (20) movably disposed within the mounting cavity (12) for closing or opening the liquid drain passage (18), the piston (20) having a liquid circulation port (21) that communicates with the liquid drain passage (18), the liquid circulation port (21) having a flow area smaller than the flow area of ​​the liquid drain passage (18); a valve core assembly including a valve core (30), the valve core (30) being movably disposed within the mounting cavity (12) to close or open the liquid flow port (21); a thermostat (50) connected to the valve seat assembly (10), the thermostat (50) including a temperature sensing portion (51) and a thermostat push rod (52), the thermostat push rod (52) including the thermostat (50) used to drive and move the valve core (30); When the temperature of the medium around the temperature sensing part (51) is lower than a predetermined temperature value, the thermostat push rod (52) contracts, the valve core (30) moves to open the liquid flow port (21), and the medium in the first liquid flow passage (111) pushes the piston (20) to move away from the liquid drain passage (18), thereby opening the liquid drain passage (18). Anti-freeze valve.

2. One end of the drain passage (18) enters into the first liquid flow passage (111), The freeze prevention valve according to claim 1 .

3. The valve core assembly further includes a first elastic structure (40), which is used to apply an elastic force to the valve core (30) to move it toward a side away from the liquid flow port (21). The freeze prevention valve according to claim 1 .

4. The flow area of ​​the balance passage (14) is smaller than the flow area of ​​the liquid flow port (21). The freeze prevention valve according to claim 1 .

5. The piston (20) a piston body (22) having the liquid flow port (21); a communication portion (23), a first end of which is connected to the piston body (22), and the liquid flow port (21) is in communication with the liquid discharge passage (18) via the communication portion (23); a closing portion (24) connected to a second end of the communication portion (23) and used to close or open the drainage passage (18), The freeze prevention valve according to claim 1 .

6. the liquid circulation port (21) is a tapered hole, the communication portion (23) has a straight hole, the liquid circulation port (21) communicates with the discharge passage (18) via the straight hole, and the diameter of the tapered hole gradually decreases along a direction from the tapered hole toward the straight hole. The freeze prevention valve according to claim 5.

7. The valve seat assembly (10) comprises: a first valve seat (15) having the first liquid flow passage (111) and a first access port (151); a second valve seat (16) having the second liquid flow passage (112) and connected to the first valve seat (15); a valve cover (17) disposed within the first mounting port (151) and connected to both the first valve seat (15) and the second valve seat (16), the valve cover (17) having the balance passage (14) and a first mounting hole (171), the mounting cavity (12) being formed by being surrounded by the valve cover (17) and the first valve seat (15), at least a portion of the piston (20) being slidably disposed within the first mounting hole (171), and the extension direction of the first mounting hole (171) being the same as the sliding direction of the piston (20). The freeze prevention valve according to claim 3.

8. The valve cover (17) a valve cover body (173) having a second mounting hole (172), the balance passage (14), and the first mounting hole (171), wherein a thermostat body (53) of the thermostat (50) is disposed in the second mounting hole (172), and the balance passage (14) is disposed at a distance from the second mounting hole (172); a cylindrical structure (174) located within the first mounting hole (171), a first end of the cylindrical structure (174) connected to the valve cover body (173), at least a portion of the valve core (30) located in an internal cavity of the cylindrical structure (174), the internal cavity communicating with both the balance passage (14) and the second mounting hole (172). The freeze prevention valve according to claim 7.

9. The valve cover (17) further includes a locking structure (175) provided at the second end of the cylindrical structure (174), the locking structure (175) having a through-hole (1751), the through-hole (1751) is used to pass the valve core (30), and the locking structure (175) is used to position and lock the first elastic structure (40). The freeze prevention valve according to claim 8.

10. the second valve seat (16) has a second mounting port (164), at least a portion of the valve cover (17) is inserted into the second mounting port (164), and the second liquid flow passage (112) communicates with the balance passage (14) through the second mounting port (164); The anti-freeze valve is a first sealing structure (300) disposed between the valve cover (17) and the first access port (151); or a second sealing structure (400) disposed between the valve cover (17) and the second access port (164); or a first sealing structure (300) disposed between the valve cover (17) and the first mounting port (151); and a second sealing structure (400) disposed between the valve cover (17) and the second mounting port (164). The freeze prevention valve according to claim 7.

11. The balance passage (14) is one and is located on one side of the second mounting hole (172), or the balance passage (14) is multiple and the multiple balance passages (14) are arranged at intervals in the circumferential direction surrounding the second mounting hole (172). The freeze prevention valve according to claim 8.

12. The inner hole of the drain passage (18) is a drain portion (13), The anti-freeze valve further includes a second elastic structure (200) used to apply an elastic force to the piston (20) to move it toward a side away from the drain portion (13). The freeze prevention valve according to claim 1 .

13. The valve core assembly further includes a first elastic structure (40), which is used to apply an elastic force to the valve core (30) to move it toward a side away from the liquid flow port (21) and an elastic force to the piston (20) to move it toward the liquid discharge portion (13). The freeze protection valve of claim 12.

14. the first elastic structure (40) is a first spring, the second elastic structure (200) is a second spring, and the stiffness coefficient of the first spring is greater than the stiffness coefficient of the second spring; The freeze protection valve according to claim 13.

15. The cross section of the drainage passage (18) is a circle with a diameter of 10 mm or more. The freeze prevention valve according to claim 1 .

16. The valve seat assembly (10) further includes a communication passage (113) that is provided so as to form an included angle with both the first liquid flow passage (111) and the second liquid flow passage (112), and the first liquid flow passage (111) communicates with the second liquid flow passage (112) via the communication passage (113); The communication passage (113) and the drain passage (18) are arranged to be offset from each other. The freeze protection valve according to claim 13.

17. The valve seat assembly (10) includes a first valve seat (15) and a second valve seat (16), the first valve seat (15) having the first liquid flow passage (111) and a first attachment port (151), the second valve seat (16) having the second liquid flow passage (112), the first valve seat (15) and the second valve seat (16) being connected, and the communication passage (113) including a first sub-communication passage (1131) and a second sub-communication passage (1132), The first valve seat (15) is a first cylinder body (152) having a first mounting port (151), the drain passage (18) being located within the first cylinder body (152) and forming a positioning space between the drain passage (18) and an inner wall of the first cylinder body (152), the positioning space being used to position and lock the second elastic structure (200); a second cylinder body (153) connected to the second valve seat (16), the internal cavity of which forms the first sub-communication passage (1131); a first pipe body (154) inserted into the first cylinder body (152) and the second cylinder body (153), the internal cavity of the first pipe body (154) being the first liquid flow passage (111); 17. The freeze protection valve of claim 16.

18. The second valve seat (16) is a second pipe body (161), the internal cavity of which is the second liquid flow passage (112); a third cylinder body (162) provided in the second pipe body (161) and communicating with the second liquid flow passage (112), the third cylinder body (162) having a second mounting hole (164); a fourth cylinder body (163) provided in the second pipe body (161) and communicating with the second liquid flow passage (112), the internal cavity of the fourth cylinder body (163) forming the second sub-communication passage (1132) and communicating with the second cylinder body (153); the first cylinder body (152) is disposed opposite to and connected to the third cylinder body (162), and the second cylinder body (153) is disposed opposite to and connected to the fourth cylinder body (163).

18. The freeze protection valve of claim 17.

19. The anti-freeze valve is a third sealing structure (600) disposed at a connection point between the second cylinder body (153) and the fourth cylinder body (163); the third sealing structure (600) is located between the end surface of the second cylinder body (153) and the end surface of the fourth cylinder body (163); 19. The freeze protection valve of claim 18.

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