Anti-freeze valve

Abstract

The present application provides an anti-freeze valve, comprising: a valve seat having a valve chamber and a valve port, the side wall of the valve chamber having a limiting surface; a valve core movably disposed in the valve chamber for opening and closing the valve port; a thermostat movably disposed in the valve chamber, one end of the thermostat is engaged with the valve core, the thermostat has a stop surface that is engaged with the limiting surface, and the stop surface and the limiting surface both have an included angle with the moving direction of the thermostat; a first passage disposed between the side wall of the thermostat and the side wall of the valve seat; a second passage disposed between the limiting surface and the stop surface and communicating with the first passage, the second passage communicating with the valve port when the valve port is opened. In use, fluid flows into the valve seat from one end away from the valve port, and enters the first passage and the second passage in turn, and when the valve port is opened, the second passage communicates with the valve port, so that the fluid can flow out of the valve port. The technical aspects provided in the present application can solve the problems of the conventional freeze prevention valve having a complicated structure and being difficult to process.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION This application relates to the field of valves, and more particularly to freeze protection valves. [Background technology]

[0002] Anti-freeze valves are used when the external environmental temperature is relatively low to discharge fluid in a heat exchange system and prevent the fluid from freezing and damaging the equipment. Anti-freeze valves typically include a valve core, a valve seat, a thermostat, and other components. When the temperature changes, the length of the thermostat expands or contracts, moving the valve core engaged with the thermostat to open or close the valve port.

[0003] The anti-freeze valve has a flow passage through which a fluid flows. In the prior art, the flow passage of the anti-freeze valve is relatively complicated, which makes it difficult to process and increases the cost. Summary of the Invention

[0004] The present application provides an anti-freeze valve that solves the problems of the conventional anti-freeze valves, which have complicated structures and are difficult to process.

[0005] In order to solve the above problems, the present application provides an anti-freeze valve including: a valve seat having a valve chamber and a valve port, the side wall of the valve chamber having a limiting surface; a valve core movably mounted within the valve chamber for opening and closing the valve port; a thermostat movably mounted within the valve chamber, one end of which is engaged with the valve core, the thermostat having a stop surface which is matingly engaged with the limiting surface, the stop surface and the limiting surface both forming an included angle with the moving direction of the thermostat; a first passage between the side wall of the thermostat and the side wall of the valve seat; and a second passage between the limiting surface and the stop surface, which is connected to the first passage and which connects to the valve port when the valve port is opened.

[0006] Additionally, the limiting or stopping surface has a recessed groove that defines a second passageway.

[0007] The valve chamber further includes a first valve hole and a second valve hole which are connected to each other, the diameter of the first valve hole being larger than that of the second valve hole, and a limiting surface at the connection point between the first valve hole and the second valve hole; the thermostat includes a guide shaft, a limiting shaft and a driving shaft which are connected in sequence, the radial size of the limiting shaft being larger than the radial sizes of the guide shaft and the driving shaft, the guide shaft and the limiting shaft being disposed within the first valve hole, and the driving shaft and the valve core being disposed within the second valve hole, the limiting shaft having a stop surface; and the first passage is located between the side wall of the limiting shaft and the inner wall of the first valve hole.

[0008] Furthermore, the limiting shaft is cylindrical, and a side wall of the limiting shaft and an inner wall of the first valve hole are clearance-fitted, and the gap between the side wall of the limiting shaft and the inner wall of the first valve hole forms a first passage.

[0009] Furthermore, the value of the gap between the side wall of the limiting shaft and the inner wall of the first valve hole is 0.1 mm or more.

[0010] Additionally, the sidewall of the limiting shaft has a first notch that defines a first passageway.

[0011] Furthermore, the anti-freeze valve further includes a third passage located between the side wall of the valve core and the side wall of the valve chamber, the third passage communicating with the second passage, and communicating with the valve port when the valve port is opened.

[0012] The valve core further includes a stop shaft and a core shaft connected to each other, the stop shaft having a radial size larger than that of the core shaft, the core shaft being used to open and close the valve port, the anti-freeze valve further includes a drive spring fitted to the core shaft, one end of which abuts against an end face of the stop shaft and the other end of which abuts against a bottom wall of the valve chamber, the third passage including a first sub-passage and a second sub-passage which are connected to each other, the first sub-passage being located between a side wall of the stop shaft and a side wall of the valve chamber, and the second sub-passage being located between a side wall of the core shaft and a side wall of the valve chamber.

[0013] Additionally, the sidewall of the retaining shaft has a second notch that defines a first sub-passage.

[0014] Furthermore, the anti-freeze valve further includes an elastic member that is fitted to the thermostat and has one end close to the valve port abutted against the stepped surface of the thermostat, one end of the valve seat away from the valve port has a reduced diameter structure that abuts against the end of the elastic member that is away from the valve port, the opening of the reduced diameter structure communicates with the valve chamber, and there is a gap between the elastic member and the outer wall of the thermostat through which a fluid can pass.

[0015] Furthermore, the valve port has a tapered first sealing surface, the valve core has an annular groove, a tapered second sealing surface and a tapered guide surface, the annular groove is located between the second sealing surface and the guide surface, the large end diameter A of the guide surface is smaller than the small end diameter G of the second sealing surface, the second sealing surface is used for limiting engagement with the first sealing surface, and the anti-freeze valve further includes a sealing ring disposed in the annular groove and abutting against the first sealing surface when the valve port is closed.

[0016] Furthermore, the valve port further has a cylindrical surface, and the chamber formed by the cylindrical surface is connected to the chamber formed by the first sealing surface, and the large end diameter A of the guide surface is smaller than the diameter B of the cylindrical surface, and when the valve port is closed, the guide surface enters the cylindrical surface.

[0017] The valve core further has a cylindrical transition surface located between the guide surface and the annular groove, the diameter of which is equal to the large end diameter A of the guide surface, and which extends into the cylindrical surface when the valve orifice is closed.

[0018] Furthermore, the first sealing surface and the second sealing surface have the same taper angle, and when the valve port is closed, the second sealing surface and the first sealing surface are in tight contact with each other.

[0019] Furthermore, the sealing ring is made of an elastic material, and when the valve port is opened, the outer diameter E of the sealing ring is greater than the small end diameter B of the first sealing surface and less than the large end diameter F of the first sealing surface.

[0020] Furthermore, the small end diameter G of the second sealing surface is larger than the small end diameter B of the first sealing surface and smaller than the large end diameter F of the first sealing surface, and the small end diameter C of the guide surface is smaller than the inner diameter D of the sealing ring.

[0021] Furthermore, the anti-freeze valve further includes a guide sleeve fitted to the thermostat and having one end adjacent to the valve port abutting against the thermostat, and an elastic member fitted to the guide sleeve and having one end adjacent to the valve port abutting against the guide sleeve or the thermostat.

[0022] Furthermore, the guide sleeve includes a sleeve and a restricting ring provided at one end of the sleeve, the outer diameter of the restricting ring being larger than the outer diameter of the sleeve, one side of the restricting ring abutting against the thermostat, the elastic member being fitted into the sleeve, and one end of the elastic member adjacent to the valve port abutting against the other side of the restricting ring.

[0023] Furthermore, the elastic member is a spring, the outer diameter H of the sleeve is smaller than the inner diameter I of the elastic member, and the outer diameter T of the limiting ring is smaller than the inner diameter V of the valve chamber.

[0024] Furthermore, one end of the guide sleeve away from the valve orifice has a guide inclined surface, and one end of the valve seat away from the valve orifice has a diameter-reducing structure, which abuts against one end of the elastic member away from the valve orifice.

[0025] The thermostat further includes a guide shaft, a limiting shaft, and a driving shaft connected in sequence, wherein the diameter of the limiting shaft is larger than the diameters of the guide shaft and the driving shaft, the driving shaft is engaged with the valve core, the guide sleeve is fitted onto the guide shaft, one end of the guide sleeve adjacent to the valve port is abutted against the limiting shaft, and the inner diameter J of the guide sleeve is larger than the outer diameter K of the guide shaft.

[0026] Furthermore, the valve core has a guide hole, the drive shaft includes a drive segment, a pressure rod and a guide segment connected in sequence, the drive segment is connected to the limiting shaft, and the diameters of the pressure rod, guide segment and drive segment increase in sequence, wherein the guide segment penetrates into the guide hole, the outer wall of the guide segment engages with the inner wall of the guide hole, the end face of the guide segment abuts against the bottom wall of the guide hole, the opening of the guide hole is chamfered, the valve core further has an assembly hole communicating with the guide hole, the diameter of the assembly hole is larger than the diameter of the guide hole, and the outer wall of the drive segment engages with the inner wall of the assembly hole.

[0027] Furthermore, the anti-freeze valve further includes an elastic member fitted to the thermostat, and a guide sleeve fitted to the thermostat and the elastic member, the guide sleeve extending along the extension direction of the valve chamber, at least a portion of the guide sleeve being in close contact with the inner wall of the valve chamber, one end of the guide sleeve adjacent to the valve opening being in contact with the thermostat, and one end of the elastic member adjacent to the valve opening being in contact with the thermostat or the guide sleeve.

[0028] Furthermore, the thermostat includes a guide shaft and a limiting shaft connected to each other, the limiting shaft protruding from the guide shaft, the guide sleeve includes a sleeve and a limiting ring connected to each other, the sleeve and the guide shaft are spaced apart, the limiting ring has an attachment hole aligned with the guide shaft, the limiting ring abuts against the limiting shaft, and the elastic member is located between the guide shaft and the sleeve.

[0029] Furthermore, the sleeve has a first guide segment and a second guide segment connected to each other, the second guide segment is connected to the restricting ring, the first guide segment is in close contact with the inner wall of the valve chamber, and the second guide segment and the inner wall of the valve chamber are spaced apart.

[0030] Furthermore, a positioning flange is formed between the first guide segment and the second guide segment, and the elastic member abuts against the positioning flange.

[0031] Furthermore, a guide surface is provided at one end of the first guide segment remote from the valve port, and the guide surface is provided at a preset angle with respect to the extending direction of the guide sleeve, and the guide surface guides the thermostat.

[0032] Furthermore, the second guide segment is provided with a through-hole, and the gap between the second guide segment and the inner wall of the valve chamber forms a first through-hole, the through-hole connects the inner cavity of the guide sleeve with the first through-hole, and the limiting shaft and the inner wall of the valve chamber are spaced apart to form a second through-hole, where the inner cavity of the guide sleeve, the through-hole, the first through-hole and the second through-hole form a first passage.

[0033]

[0013] Applying the technical aspects of the present application, there is provided an anti-freeze valve including: a valve seat having a valve chamber and a valve port, the side wall of the valve chamber having a limiting surface; a valve core movably mounted within the valve chamber to open and close the valve port; a thermostat movably mounted within the valve chamber, one end of the thermostat engaging with the valve core, the thermostat having a stop surface matingly engaged with the limiting surface, the stop surface and the limiting surface both forming an included angle with the direction of movement of the thermostat; a first passage between the side wall of the thermostat and the side wall of the valve seat; and a second passage between the limiting surface and the stop surface and communicating with the first passage, the second passage communicating with the valve port when the valve port is opened. In use, fluid flows into the valve seat at one end remote from the valve port, and then flows sequentially into the first and second passages; when the valve port is opened, the second passage is connected to the valve port, allowing fluid to flow out of the valve port. The above arrangement simplifies the structure of the flow passage of the anti-freeze valve, thus realizing smooth fluid flow while simplifying the overall structure of the anti-freeze valve and facilitating processing. The provision of a second passage between the limiting surface and the stop surface ensures that fluid can still flow when the stop surface and the limiting surface are engaged, facilitating processing. The engagement between the stop surface and the limiting surface serves to restrict the thermostat in the direction of movement, thereby limiting the range of movement of the thermostat. [Brief explanation of the drawings]

[0034] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0035] [Figure 1] 1 shows a cross-sectional view of an anti-freeze valve provided in an embodiment of the present application. [Figure 2] 2 shows a cross-sectional view taken along the ZZ line in FIG. 1. [Figure 3] 2 shows a cross-sectional view of the valve seat in FIG. 1. [Figure 4]4 shows a top view of the valve seat in FIG. 3. [Figure 5] FIG. 1 shows a structural schematic diagram of the thermostat. [Figure 6] 6 shows a top view of the thermostat in FIG. 5. [Figure 7] 2 shows a structural schematic diagram of another thermostat in FIG. 1. [Figure 8] 8 shows a top view of the thermostat in FIG. 7. [Figure 9] 2 shows a cross-sectional view of the valve core in FIG. 1. [Figure 10] 10 shows a top view of the valve core in FIG. 9. [Figure 11] 2 shows an enlarged partial view of the valve port position of the freeze prevention valve in FIG. 1. [Figure 12] The size notation diagram of the valve seat in Figure 1 is shown below. [Figure 13] Figure 1 shows a schematic diagram of the valve core size notation. [Figure 14] 1 shows a structural schematic diagram of an anti-freeze valve provided in another embodiment of the present application. [Figure 15] A schematic diagram showing the size notation of the guide sleeve in FIG. 14 is shown. [Figure 16] A schematic diagram of the valve seat in FIG. 14 is shown. [Figure 17] A schematic diagram of the thermostat in FIG. 14 is shown. [Figure 18] A schematic diagram of the valve core in FIG. 14 is shown. [Figure 19] 15 shows a schematic diagram of the elastic member in FIG. 14. [Figure 20] 1 shows a structural schematic diagram of an anti-freeze valve provided in another embodiment of the present application. [Figure 21] 21 shows a schematic diagram of the guide sleeve in FIG. 20. [Figure 22] 21 shows a top view of the valve seat in the freeze prevention valve provided in FIG. 20. [Figure 23] 21 shows a cross-sectional view of one direction in which the valve port of the freeze prevention valve provided in FIG. 20 is opened. [Figure 24]21 shows a cross-sectional view of another direction in which the valve port of the anti-freeze valve provided in FIG. 20 is opened.

[0036] Here, the above drawings include the following reference numerals: 10 valve seat, 11 valve chamber, 111 limiting surface, 1111 recess, 112 first valve hole, 113 second valve hole, 12 valve port, 121 first sealing surface, 122 cylindrical surface, 13 diameter reduction structure, 20 valve core, 21 stop shaft, 211 second notch, 22 core shaft, 23 annular groove, 24 second sealing surface, 25 guide surface, 26 transition surface, 27 guide hole, 28 assembly hole, 30 thermostat, 31 guide shaft, 32 limit shaft, 321 stop surface, 322 first notch, 33 drive shaft, 331 drive segment, 332 pressure rod, 333 guide segment, 41 1st aisle, 42 2nd aisle, 51 elastic member, 52 drive spring, 60 third passage, 61 first sub-passage, 62 second sub-passage, 70 sealing ring, 80 guide sleeve, 81 sleeve, 811 first guide segment, 812 second guide segment, 8121 flow through hole, 82 limiting ring, 83 guide inclined surface, 84 positioning flange, 90 Restriction member, 91 Flow outlet. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The description of at least one exemplary embodiment below is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0038] As shown in FIGS. 1 to 10, the embodiment of the present application includes a valve chamber 11 and a valve port 12. The side wall of the valve chamber 11 has a valve seat 10 with a limiting surface 111. The valve core 20 is movably disposed in the valve chamber 11 to open and close the valve port 12. The thermostat 30 is movably disposed in the valve chamber 11. One end of the thermostat 30 is engaged with the valve core 20. The thermostat 30 has a stop surface 311 that is stop-engaged with the limiting surface 111. 21, and the stop surface 321 and the limiting surface 111 both form an included angle with the moving direction of the thermostat 30, a first passage 41 provided between a side wall of the thermostat 30 and a side wall of the valve seat 10, and a second passage 42 provided between the limiting surface 111 and the stop surface 321 and communicating with the first passage 41, the second passage 42 communicating with the valve orifice 12 when the valve orifice 12 is opened.

[0039] The above arrangement simplifies the structure of the flow passages in the anti-freeze valve, thereby realizing smooth fluid flow while simplifying the overall structure of the anti-freeze valve and facilitating processing. The provision of second passage 42 between limiting surface 111 and stop surface 321 ensures that fluid can still flow when stop surface 321 and limiting surface 111 are engaged, and also facilitates processing. The engagement between stop surface 321 and limiting surface 111 serves to restrict thermostat 30 in the direction of movement of thermostat 30, thereby limiting the range of movement of thermostat 30.

[0040] Alternatively, the second passage 42 may be provided on the stop surface 321 of the thermostat 30 or on the limiting surface of the valve chamber 11. Here, the stop surface 321, the limiting surface 111, and the movement direction of the thermostat 30 may form an angle of 90°.

[0041] Here, the limiting surface 111 or the stop surface 321 has a groove 1111 that forms the second passage 42. The limiting surface 111 and the stop surface 321 may both have the groove 1111 drilled therein, and drilling the groove 1111 allows the fluid to smoothly pass between the limiting surface 111 and the stop surface 321, i.e., through the second passage 42. In this embodiment, two grooves 1111 are provided to improve the smoothness of the fluid flow.

[0042] Specifically, the valve chamber 11 includes a first valve hole 112 and a second valve hole 113 that are connected to each other. The diameter of the first valve hole 112 is larger than that of the second valve hole 113. A limiting surface 111 is formed at the junction between the first valve hole 112 and the second valve hole 113. The thermostat 30 includes a guide shaft 31, a limiting shaft 32, and a drive shaft 33 that are connected in sequence. The radial size of the limiting shaft 32 is larger than that of the guide shaft 31 and the drive shaft 33. The guide shaft 31 and the limiting shaft 32 are located within the first valve hole 112. The drive shaft 33 and the valve core 20 are located within the second valve hole 113. The limiting shaft 32 has a stop surface 321. The first passage 41 is located between the side wall of the limiting shaft 32 and the inner wall of the first valve hole 112.

[0043] With the above-described arrangement, the limiting surface 111 at the connection point between the first valve hole 112 and the second valve hole 113 can engage with the stop surface 321 on the limiting shaft 32 to limit the movement range of the thermostat 30. The diameter of the first valve hole 112 is larger than that of the second valve hole 113 so that the limiting surface 111 can be formed at the connection point, and the radial size of the limiting shaft 32 is larger than the radial sizes of the guide shaft 31 and the drive shaft 33, making assembly and limiting easier. The drive shaft 33 and the valve core 20 are located within the second valve hole 113, making it easier for the drive shaft 33 to engage with the valve core 20.

[0044] 5 and 6, in one embodiment, the limiting shaft 32 is cylindrical, and the side wall of the limiting shaft 32 is clearance-fitted with the inner wall of the first valve hole 112, and the gap between the side wall of the limiting shaft 32 and the inner wall of the first valve hole 112 forms the first passage 41. The cylindrical shape of the limiting shaft 32 facilitates engagement with the inner wall of the first valve hole 112. The clearance-fit between the side wall of the limiting shaft 32 and the inner wall of the first valve hole 112 leaves a gap to ensure smooth fluid passage.

[0045] Furthermore, the value of the gap between the side wall of the limiting shaft 32 and the inner wall of the first valve hole 112 is not less than 0.1 mm. Limiting the value of the gap between the two within the above numerical range ensures that the fluid passes smoothly through the gap between the side wall of the limiting shaft 32 and the inner wall of the first valve hole 112, thereby reducing or avoiding problems such as unsmooth fluid flow and blockage.

[0046] 7 and 8, in another embodiment, the side wall of the limiting shaft 32 has a first notch 322 that forms the first passage 41. Providing the first notch 322 on the side wall of the limiting shaft 32 not only ensures that the fluid can pass through the first passage 41, but also makes processing easier. Here, providing two first notches 322 improves the smoothness of the fluid flow. It may be understood that the first notch 322 is formed by removing a portion of the material of the limiting shaft 32 during processing.

[0047] Specifically, the anti-freeze valve further includes a third passage 60 located between the side wall of the valve core 20 and the side wall of the valve chamber 11, the third passage 60 communicating with the second passage 42, and communicating with the valve port 12 when the valve port 12 is opened. In this embodiment, the third passage 60 communicates with the second passage 42, ensuring that fluid can pass through the second passage 42 and then enter the third passage 60. When the valve port 12 is opened, the third passage 60 communicates with the valve port 12, i.e., fluid can flow out from the valve port 12, thereby achieving a drainage function.

[0048] Here, the valve core 20 includes a stop shaft 21 and a core shaft 22 connected to each other, the radial size of the stop shaft 21 being larger than the radial size of the core shaft 22, and the core shaft 22 is used to open and close the valve port 12, the anti-freeze valve further includes a drive spring 52 fitted to the core shaft 22, one end abutting against the end face of the stop shaft 21 and the other end abutting against the bottom wall of the valve chamber 11, the third passage 60 includes a first sub-passage 61 and a second sub-passage 62 which are connected to each other, the first sub-passage 61 being located between the side wall of the stop shaft 21 and the side wall of the valve chamber 11, and the second sub-passage 62 being located between the side wall of the core shaft 22 and the side wall of the valve chamber 11.

[0049] In this embodiment, the radial size of the stopper shaft 21 is set larger than the radial size of the core shaft 22, allowing the stopper shaft 21 to engage with the drive spring 52 in a limited manner, allowing the elastic force of the drive spring 52 to act on the valve core 20. By providing the drive spring 52, the elastic force of the drive spring 52 acts on the valve core 20, moving the valve core 20 in conjunction with the drive spring 52. When the thermostat 30 moves toward one end of the valve port 12, it pushes the valve core 20 toward the valve port 12, compressing the drive spring 52 and forcing the valve core 20 against the valve port 12, thereby closing the valve port 12. When the thermostat 30 moves toward the end away from the valve port 12, the drive spring 52 is compressed, so the elastic force of the drive spring 52 pushes the valve core 20 toward the end away from the valve port 12, thereby opening the valve port 12.

[0050] Furthermore, the side wall of the retaining shaft 21 has a second notch 211 that forms the first sub-passage 61. Providing the second notch 211 on the side wall of the retaining shaft 21 not only ensures that the fluid can pass through the retaining shaft 21, but also makes processing easier. Here, two second notches 211 are provided to improve the smoothness of the fluid flow.

[0051] As shown in FIG. 1 , the freeze prevention valve further includes an elastic member 51 fitted to the thermostat 30, with one end adjacent to the valve port 12 abutting against a stepped surface of the thermostat 30. One end of the valve seat 10 remote from the valve port 12 has a diameter-reducing structure 13 abutting against the end of the elastic member 51 remote from the valve port 12, the opening of the diameter-reducing structure 13 communicating with the valve chamber 11, and a gap through which fluid can pass between the elastic member 51 and the outer wall of the thermostat 30. Having one end of the elastic member 51 abut against the stepped surface of the thermostat 30 and the other end remote from the valve port 12 abutting against the diameter-reducing structure 13 prevents the elastic member 51 from popping out. The provision of the elastic member 51 allows pressure to be applied to the thermostat 30 so that the thermostat 30 and the valve core 20 abut against each other. A gap is provided between the elastic member 51 and the outer wall of the thermostat 30 to ensure that the fluid can pass through smoothly. The opening in the diameter-reducing structure 13 is used to allow the fluid to flow in.

[0052] As shown in Figures 11 to 13, the valve port 12 has a tapered first sealing surface 121, the valve core 20 has an annular groove 23, a tapered second sealing surface 24 and a tapered guide surface 25, the annular groove 23 is located between the second sealing surface 24 and the guide surface 25, the large end diameter A of the guide surface 25 is smaller than the small end diameter G of the second sealing surface 24, the second sealing surface 24 is used for limiting engagement with the first sealing surface 121, and a sealing ring 70 is disposed in the annular groove 23, where the sealing ring 70 abuts against the first sealing surface 121 when the valve port 12 is closed.

[0053] In this embodiment, the tapered guide surface 25 is provided, and the large end diameter A of the guide surface 25 is smaller than the small end diameter G of the second sealing surface 24. Therefore, when the valve core 20 closes the valve orifice 12, the guide surface 25 first enters the valve orifice 12, ensuring that the valve core 20 is accurately positioned before sealing, thereby enabling the guide surface 25 to perform a guiding function. The tapered first sealing surface 121 and the second sealing surface 24 are configured to engage with each other in a limiting manner, thereby improving the sealing performance of the valve orifice 12. When the valve orifice 12 is closed, the sealing ring 70 abuts against the first sealing surface 121 and is in close contact with the inner wall of the annular groove 23, thereby improving the sealing performance of the valve orifice 12.

[0054] Specifically, the valve port 12 further has a cylindrical surface 122, a chamber formed by the cylindrical surface 122 is connected to a chamber formed by the first sealing surface 121, and a large end diameter A of the guide surface 25 is smaller than a diameter B of the cylindrical surface 122, so that when the valve port 12 is closed, the guide surface 25 enters the cylindrical surface 122. By providing the cylindrical surface 122 and making the large end diameter A of the guide surface 25 smaller than the diameter B of the cylindrical surface 122, the guide surface 25 can smoothly enter the cylindrical surface 122 and perform a guiding function.

[0055] Here, the valve core 20 further has a cylindrical transition surface 26 located between the guide surface 25 and the annular groove 23, the diameter of which is equal to the large end diameter A of the guide surface 25, and which fits into the cylindrical surface 122 when the valve orifice 12 is closed. By providing the transition surface 26 with a cylindrical shape and with a diameter equal to the large end diameter A of the guide surface 25, the transition surface 26 can further play a guiding role when the valve orifice 12 is closed, so that the valve core 20 is first properly guided before sealing the valve orifice 12, thereby ensuring a sealing effect.

[0056] Specifically, the first sealing surface 121 and the second sealing surface 24 have the same taper angle, and when the valve port 12 is closed, the second sealing surface 24 and the first sealing surface 121 come into close contact. By providing the first sealing surface 121 and the second sealing surface 24 with the same taper angle, when the valve port 12 is closed, the second sealing surface 24 and the first sealing surface 121 come into close contact, thereby improving the sealing performance of the valve port 12.

[0057] Specifically, the sealing ring 70 is made of an elastic material, and when the valve port 12 is open, the outer diameter E of the sealing ring 70 is larger than the small end diameter B of the first sealing surface 121 but smaller than the large end diameter F of the first sealing surface 121. By making the sealing ring 70 of an elastic material and by making the outer diameter E of the sealing ring 70 larger than the small end diameter B of the first sealing surface 121 but smaller than the large end diameter F of the first sealing surface 121, when the valve port 12 is closed, the sealing ring 70 is pressed and elastically deformed, and thus the sealing ring 70 abuts against the first sealing surface 121 and the inner wall of the annular groove 23, increasing the sealing area and ensuring tightness of the sealing of the valve port 12, thereby improving the service life of the anti-freeze valve.

[0058] Here, the small end diameter G of the second sealing surface 24 is larger than the small end diameter B of the first sealing surface 121 and smaller than the large end diameter F of the first sealing surface 121. By making the small end diameter G of the second sealing surface 24 larger than the small end diameter B of the first sealing surface 121, the second sealing surface 24 will not intrude into the cylindrical surface 122. At the same time, by making the small end diameter G of the second sealing surface 24 smaller than the large end diameter F of the first sealing surface 121, the second sealing surface 24 and the first sealing surface 121 can be effectively engaged with each other, improving the stability and reliability of the sealing of the valve port 12.

[0059] Specifically, the small end diameter C of the guide surface 25 is smaller than the inner diameter D of the sealing ring 70. In this way, the sealing ring 70 can pass smoothly over the guide surface 25, facilitating installation.

[0060] As shown in Figures 14 to 19, an embodiment of the present application provides another anti-freeze valve, which, based on the above embodiment, further includes a guide sleeve 80 that is fitted to the thermostat 30 and has one end that is close to the valve port 12 abutting against the thermostat 30, and an elastic member 51 that is fitted to the guide sleeve 80 and has one end that is close to the valve port 12 abutting against the guide sleeve 80 or the thermostat 30.

[0061] When this embodiment is adopted, the guide sleeve 80 is provided to fit around the thermostat 30, and the elastic member 51 is fitted into the guide sleeve 80, thereby eliminating the relatively large gap between the elastic member 51 and the thermostat 30 and allowing the guide sleeve 80 to guide the thermostat 30 and the elastic member 51. In this way, during assembly, the guiding and restricting effects of the guide sleeve 80 reduce or avoid the problem of the thermostat 30 shifting due to uneven pressing force of the elastic member 51, improving the stability of operation of the thermostat 30. Here, the inner wall of the guide sleeve 80 engages with the outer wall of the thermostat 30, and the outer wall of the guide sleeve 80 engages with the inner wall of the elastic member 51, reducing the effect of the elastic member on the thermostat 30 during assembly and improving the stability and reliability of operation.

[0062] Specifically, the guide sleeve 80 includes a sleeve 81 and a limiting ring 82 attached to one end of the sleeve 81. The outer diameter of the limiting ring 82 is larger than that of the sleeve 81. One side of the limiting ring 82 abuts against the thermostat 30. The elastic member 51 is fitted into the sleeve 81, and one end of the elastic member 51 adjacent to the valve port 12 abuts against the other side of the limiting ring 82. The guide sleeve 80 is provided with the sleeve 81, and fitting the elastic member 51 into the sleeve 81 prevents the elastic member 51 from acting directly on the thermostat 30, thereby reducing or avoiding the problem of misalignment caused by the influence of the elastic member 51 when the thermostat 30 is activated. The installation of the limiting ring 82 allows the elastic member 51 and the limiting ring 82 to abut against each other. In this way, the elastic force of the elastic member 51 is applied to the thermostat 30 via the limiting ring 82, causing the thermostat 30 to press against the valve core 20.

[0063] Here, the elastic member 51 is a spring, and the outer diameter H of the sleeve 81 is smaller than the inner diameter I of the elastic member 51. In the present application, by providing the elastic member 51 as a spring, its elastic deformation capacity is large and its recovery capacity is strong, and by making the outer diameter H of the sleeve 81 smaller than the inner diameter I of the elastic member 51, it becomes easy to fit the elastic member 51 into the sleeve 81, and a gap is formed to allow fluid to pass through.

[0064] Furthermore, the outer diameter T of the restrictor ring 82 is smaller than the inner diameter V of the valve chamber 11. This arrangement ensures that a gap is formed between the restrictor ring 82 and the inner wall of the valve chamber 11 so that fluid can pass through, and also facilitates installation and prevents the guide sleeve 80 from getting stuck when moving with the thermostat 30.

[0065] Specifically, the guide sleeve 80 has an inclined guide surface 83 at one end remote from the valve orifice 12. By providing the inclined guide surface 83, when the thermostat 30 moves toward the end remote from the valve orifice, it is possible to properly guide the guide sleeve 80 in advance and prevent the guide sleeve 80 from getting caught on the inner ring of the elastic member 51, improving the stability of the thermostat 30 during operation.

[0066] Specifically, one end of the valve seat 10 remote from the valve orifice 12 has a diameter reducing structure 13, which abuts against one end of the elastic member 51 remote from the valve orifice 12. By providing the diameter reducing structure 13 to abut against one end of the elastic member 51, it serves to restrict the elastic member 51 and prevent the elastic member 51 from popping out. In this embodiment, the diameter reducing structure 13 and the elastic member 51 may be connected by crimping, which makes the structure stable and robust and facilitates assembly.

[0067] During the crimping assembly process, the pressing force of the elastic member 51 is uneven, and without the guidance of the guide sleeve 80, the thermostat 30 may tilt, increasing resistance to the up and down movement of the thermostat 30 and causing it to fail to operate. The provision of the guide sleeve 80, on the one hand, prevents the thermostat 30 from becoming eccentric when crimping, and on the other hand, prevents the thermostat 30 from becoming eccentric during movement, increasing the reliability of the movement of the thermostat 30 and making the anti-freeze valve more flexible and consistent when opening and closing.

[0068] Specifically, the thermostat 30 includes a guide shaft 31, a limiting shaft 32, and a driving shaft 33 connected in sequence. The diameter of the limiting shaft 32 is larger than those of the guide shaft 31 and the driving shaft 33. The driving shaft 33 is engaged with the valve core 20. The guide sleeve 80 is fitted onto the guide shaft 31, and one end of the guide sleeve 80 adjacent to the valve port 12 abuts against the limiting shaft 32. The guide shaft 31 facilitates fitting the guide sleeve 80 onto the guide shaft 31. The limiting shaft 32 is provided to provide axial limiting engagement with the inner wall of the valve chamber 11, limiting the range of movement of the thermostat 30 and enabling it to withstand the elastic force exerted by the elastic member 51. The driving shaft 33 is fitted to the valve core 20, so that when the thermostat 30 expands, it drives the valve core 20 to close the valve port 12.

[0069] Here, the inner diameter J of the guide sleeve 80 is larger than the outer diameter K of the guide shaft 31. By providing it in this manner, the guide sleeve 80 can be easily fitted onto the guide shaft 31 smoothly.

[0070] Furthermore, the valve core 20 has a guide hole 27, and the drive shaft 33 includes a drive segment 331, a pressure rod 332, and a guide segment 333 connected in sequence. The drive segment 331 is connected to the limiting shaft 32, and the diameters of the pressure rod 332, the guide segment 333, and the drive segment 331 increase in sequence. Here, the guide segment 333 penetrates into the guide hole 27, the outer wall of the guide segment 333 engages with the inner wall of the guide hole 27, and the end face of the guide segment 333 abuts against the bottom wall of the guide hole 27.

[0071] The valve core 20 is provided with a guide hole 27, which can guide the guide segment 333. With the above arrangement, when the valve core 20 is properly guided, it can guide the thermostat 30, and when the thermostat 30 is properly guided, it can guide the valve core 20. Therefore, the valve core 20 and the thermostat 30 can guide each other, making the guide more stable and reliable, ensuring the stability of the thermostat 30 during operation, and improving the sealing performance when the valve core 20 closes the valve port 12.

[0072] Here, the opening of the guide hole 27 is chamfered, and the valve core 20 further has an assembly hole 28 communicating with the guide hole 27, with the diameter of the assembly hole 28 being larger than that of the guide hole 27, and the outer wall of the driving segment 331 engaging with the inner wall of the assembly hole 28. By chamfering the opening of the guide hole 27 and making the diameter of the assembly hole 28 larger than that of the guide hole 27, it is possible to facilitate the assembly of the thermostat 30 and the valve core 20. In addition, the outer wall of the driving segment 331 engaging with the inner wall of the assembly hole 28 can also provide a mutual guide between the valve core 20 and the thermostat 30.

[0073] As shown in Figures 20 to 24, in another embodiment of the present application, the freeze prevention valve further includes an elastic member 51 fitted to the thermostat 30, and a guide sleeve 80 fitted to the thermostat 30 and the elastic member 51, wherein the guide sleeve 80 extends along the extension direction of the valve chamber 11, at least a portion of the guide sleeve 80 is in close contact with the inner wall of the valve chamber 11, one end of the guide sleeve 80 adjacent to the valve port 12 abuts against the thermostat 30, and one end of the elastic member 51 adjacent to the valve port 12 abuts against the thermostat 30 or the guide sleeve 80.

[0074] In this embodiment, the guide sleeve 80 is fitted over the thermostat 30 and the elastic member 51, i.e., the thermostat 30 and the elastic member 51 are both located within the internal cavity of the guide sleeve 80, with at least a portion of the guide sleeve 80 tightly contacting the inner wall of the valve chamber 11. This facilitates the guide sleeve 80 to effectively guide the movement of the thermostat 30, preventing misalignment during movement of the thermostat 30 and improving concentricity with the valve seat 10 as the thermostat 30 moves up and down, thereby improving the reliability and coaxiality of the thermostat 30 movement within the valve seat 10, improving the positioning of the thermostat 30 relative to the valve core 20, ensuring reliable up and down movement of the valve core 20, and therefore reliable sealing of the valve port 12. Therefore, the anti-freeze valve provided in this embodiment solves the technical problem of the prior art anti-freeze valves, which had relatively poor sealing reliability of the valve port 12.

[0075] In this embodiment, "at least a portion of the guide sleeve 80 is tightly fitted to the inner wall of the valve chamber 11" does not mean that at least a portion of the guide sleeve 80 is completely fitted to the inner wall of the valve chamber 11. There may be a relatively small gap between at least a portion of the guide sleeve 80 and the inner wall of the valve chamber 11. However, this relatively small gap does not affect the ability of the inner wall of the valve chamber 11 to guide the position of the guide sleeve 80 along the extension direction of the inner wall of the valve chamber 11, and effectively ensures smooth and stable guiding of the guide sleeve 80.

[0076] In this embodiment, the thermostat 30 includes a guide shaft 31 and a limiting shaft 32 connected to each other, the limiting shaft 32 protruding from the guide shaft 31, the guide sleeve 80 includes a sleeve 81 and a limiting ring 82 connected to each other, the sleeve 81 and the guide shaft 31 are spaced apart, the limiting ring 82 has an attachment hole aligned with the guide shaft 31, the limiting ring 82 abuts against the limiting shaft 32, and the elastic member 51 is located between the guide shaft 31 and the sleeve 81. The abutment of the limiting ring 82 and the limiting shaft 32 increases the contact area between the limiting ring 82 and the limiting shaft 32, which effectively improves the stability of positioning relative to the guide sleeve 80.

[0077] Here, the sleeve 81 has a first guide segment 811 and a second guide segment 812 connected to each other, the second guide segment 812 is connected to the restricting ring 82, the first guide segment 811 is in close contact with the inner wall of the valve chamber 11, and there is a gap between the second guide segment 812 and the inner wall of the valve chamber 11. By adopting such a structure, the first guide segment 811 can easily improve the guiding stability of the guide sleeve 80, and the avoidance of the second guide segment 812 and the inner wall of the valve chamber 11 can easily reduce the guiding resistance of the guide sleeve 80.

[0078] In this embodiment, a positioning flange 84 is formed between the first guide segment 811 and the second guide segment 812, and the elastic member 51 abuts against the positioning flange 84. By adopting such a structure, it is possible to facilitate effective positioning of the elastic member 51 so that the elastic member 51 can be compressed or expanded along the extension direction of the valve chamber 11, thereby improving the stability of the function of the elastic member 51. Specifically, the positioning flange 84 is formed between the first guide segment 811 and the second guide segment 812, and the elastic member 51 abuts against the positioning flange 84.

[0079] Specifically, a guide inclined surface 83 is provided at one end of the first guide segment 811 remote from the valve port 12, and the guide inclined surface 83 is provided at a preset angle with respect to the extension direction of the guide sleeve 80, and the thermostat 30 is guided by the guide inclined surface 83. By adopting such a structure, the elastic member 51 protruding from the guide sleeve 80 can be smoothly compressed into the internal cavity of the guide sleeve 80 under the guiding action of the guide inclined surface 83, thereby improving the stability of the action of the elastic member.

[0080] In this embodiment, the second guide segment 812 is provided with a through-hole 8121, and the gap between the second guide segment 812 and the inner wall of the valve chamber 11 forms a first gap. The through-hole 8121 connects the inner cavity of the guide sleeve 80 with the first gap. The limiting shaft 32 and the inner wall of the valve chamber 11 are spaced apart to form a second gap. The inner cavity of the guide sleeve 80, the through-hole 8121, the first gap, and the second gap form the first passage 41. This structural installation allows fluid to flow smoothly from the inner cavity of the guide sleeve 80 to the valve port 12 when the anti-freeze valve is in operation, ensuring smooth operation of the anti-freeze valve.

[0081] Specifically, a groove 1111 is provided on the inner wall of the valve seat 10, and the second flow gap may be connected to the third flow gap through the groove 1111. By optimizing the structural layout, it becomes easier to connect the second flow gap and the third flow gap, allowing the fluid to flow smoothly.

[0082] Specifically, in this embodiment, the gap between the outer diameter of the valve core 20 and the valve core 20 is 0.4 mm or more. By adopting this structure, the flow capacity of the anti-freeze valve can be effectively ensured.

[0083] Specifically, in this embodiment, the valve port 12 is located at one end of the valve chamber 11, and the other end of the valve chamber 11 is a communication port. A restricting member 90 is attached to the communication port, and the restricting member 90 is crimped at the communication port, and a flow port 91 is provided in the restricting member 90.

[0084] In this embodiment, one end of the elastic member 51 that is close to the communication port abuts against the restricting member 90, thereby improving the stability of the action of the elastic member 51. Alternatively, the guide shaft 31 of the thermostat 30 is movably inserted into the communication port 91 of the restricting member 90, so that the thermostat 30 can easily have sufficient expansion and contraction space. Alternatively, one end of the elastic member 51 that is close to the communication port abuts against the restricting member 90, so that the stability of the action of the elastic member 51 is improved and the thermostat 30 can easily have sufficient expansion and contraction space, so that the guide shaft 31 of the thermostat 30 is movably inserted into the communication port 91 of the restricting member 90.

[0085] Note that "the guide shaft 31 of the thermostat 30 is movably inserted into the flow port 91 of the restricting member 90" does not mean that the guide shaft 31 of the thermostat 30 is necessarily inserted into the flow port 91 of the restricting member 90, but rather that when the length of the thermostat 30 changes due to a temperature change, the elastic member 51 can be compressed and the thermostat 30 can be inserted into the flow port 91 of the restricting member 90.

[0086] In this embodiment, fluid flows through the inside of the guide sleeve 80, the through-hole 8121, the first clearance gap, the two clearance gaps between the thermostat 30 and the valve seat 10, the groove 1111 in the valve seat 10, the gap between the end face of the valve core 20 and the valve seat, and the valve port 12. The flow diameters at each point are sufficiently large to ensure sufficient flow capacity, improving the Kv value of the anti-freeze valve when it is open and increasing its drainage capacity. The guide sleeve 80 provides reliable guidance, while the improved flow path eliminates the need for a clearance fit between the thermostat 30 and the valve seat 10. This allows for a larger gap between the thermostat 30 and the valve seat 10, significantly improving flow capacity.

[0087] 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 should be included within the protection scope of the present application.

Claims

1. a valve seat (10) having a valve chamber (11) and a valve port (12), the side wall of the valve chamber (11) having a limiting surface (111); a valve core (20) movably provided in the valve chamber (11) for opening and closing the valve port (12); a thermostat (30) movably mounted within the valve chamber (11), one end of the thermostat (30) being engaged with the valve core (20), the thermostat (30) having a stop surface (321) that is stop-engaged with the limiting surface (111), the stop surface (321) and the limiting surface (111) both being non-parallel to the moving direction of the thermostat (30); a first passage (41) provided between a side wall of the thermostat (30) and a side wall of the valve seat (10); a second passage (42) provided between the limiting surface (111) and the stop surface (321) and communicating with the first passage (41), the second passage (42) communicating with the valve port (12) when the valve port (12) is opened; Including, The valve chamber (11) includes a first valve hole (112) and a second valve hole (113) that are connected to each other, the diameter of the first valve hole (112) is larger than the diameter of the second valve hole (113), and the connection point between the first valve hole (112) and the second valve hole (113) has the limiting surface (111).

2. 2. The freeze prevention valve according to claim 1, wherein the limiting surface (111) or the stop surface (321) has a recess (1111) that forms the second passage (42).

3. 2. The freeze prevention valve according to claim 1, wherein the thermostat (30) includes a guide shaft (31), a limiting shaft (32), and a drive shaft (33) connected in sequence, the radial size of the limiting shaft (32) being larger than the radial sizes of the guide shaft (31) and the drive shaft (33), the guide shaft (31) and the limiting shaft (32) being arranged in the first valve hole (112), the drive shaft (33) and the valve core (20) being arranged in the second valve hole (113), the limiting shaft (32) having the stop surface (321), and the first passage (41) being located between a side wall of the limiting shaft (32) and an inner wall of the first valve hole (112).

4. 4. The freeze prevention valve according to claim 3, wherein the limiting shaft (32) is cylindrical, a side wall of the limiting shaft (32) and an inner wall of the first valve hole (112) are clearance-fitted, and the gap between the side wall of the limiting shaft (32) and the inner wall of the first valve hole (112) forms the first passage (41).

5. 5. The freeze prevention valve according to claim 4, wherein a value of a gap between a side wall of the limiting shaft (32) and an inner wall of the first valve hole (112) is 0.1 mm or more, and the side wall of the limiting shaft (32) has a first notch (322) that forms the first passage (41).

6. 2. The freeze prevention valve according to claim 1, further comprising a third passage (60) located between a side wall of the valve core (20) and a side wall of the valve chamber (11), the third passage (60) being in communication with the second passage (42), and the third passage (60) being in communication with the valve port (12) when the valve port (12) is opened.

7. The valve core (20) includes a stopper shaft (21) and a core shaft (22) connected to each other, the stopper shaft (21) having a radial size larger than the radial size of the core shaft (22), and the core shaft (22) is used to open and close the valve port (12); The freeze prevention valve further includes a drive spring (52) fitted to the core shaft (22), one end of which abuts against an end face of the stop shaft (21) and the other end of which abuts against a bottom wall of the valve chamber (11), 7. The freeze prevention valve according to claim 6, wherein the third passage (60) includes a first sub-passage (61) and a second sub-passage (62) that are connected to each other, the first sub-passage (61) being located between a side wall of the stop shaft (21) and a side wall of the valve chamber (11), and the second sub-passage (62) being located between a side wall of the core shaft (22) and a side wall of the valve chamber (11).

8. 8. The freeze protection valve according to claim 7, wherein the side wall of the stop shaft (21) has a second notch (211) that forms the first sub-passage (61).

9. The valve orifice (12) has a tapered first sealing surface (121), the valve core (20) has an annular groove (23), a tapered second sealing surface (24) and a tapered guide surface (25), the annular groove (23) is located between the second sealing surface (24) and the guide surface (25), the large end diameter A of the guide surface (25) is smaller than the small end diameter G of the second sealing surface (24), and the second sealing surface (24) is used for limiting engagement with the first sealing surface (121); 2. The anti-freeze valve according to claim 1, further comprising a sealing ring (70) disposed in the annular groove (23) and abutting against the first sealing surface (121) when the valve port (12) is closed.

10. 10. The freeze prevention valve according to claim 9, wherein the valve port (12) further has a cylindrical surface (122), a chamber formed by the cylindrical surface (122) surrounding the valve port (12) is in communication with a chamber formed by the first sealing surface (121) surrounding the valve port (12), a large end diameter A of the guide surface (25) is smaller than a diameter B of the cylindrical surface (122), and the guide surface (25) is recessed into the cylindrical surface (122) when the valve port (12) is closed.

11. 11. The freeze protection valve according to claim 10, wherein the valve core (20) further comprises a cylindrical transition surface (26) located between the guide surface (25) and the annular groove (23), the diameter of which is equal to the large end diameter A of the guide surface (25), and which extends into the cylindrical surface (122) when the valve port (12) is closed.

12. 10. The freeze prevention valve according to claim 9, wherein the first sealing surface (121) and the second sealing surface (24) have the same taper angle, and when the valve port (12) is closed, the second sealing surface (24) and the first sealing surface (121) are in tight contact with each other.

13. 10. The freeze protection valve of claim 9, wherein the sealing ring (70) is made of an elastic material, and when the valve port (12) is opened, the outer diameter E of the sealing ring (70) is greater than the small end diameter B of the first sealing surface (121) and less than the large end diameter F of the first sealing surface (121).

14. 10. The freeze prevention valve according to claim 9, wherein a small end diameter G of the second sealing surface (24) is larger than a small end diameter B of the first sealing surface (121) and smaller than a large end diameter F of the first sealing surface (121), and a small end diameter C of the guide surface (25) is smaller than an inner diameter D of the sealing ring (70).

15. a guide sleeve (80) fitted to the thermostat (30), one end of which is adjacent to the valve port (12) abutting against the thermostat (30); an elastic member (51) fitted to the guide sleeve (80), one end of which is adjacent to the valve port (12) abutting against the guide sleeve (80) or the thermostat (30); The freeze protection valve of claim 1 further comprising:

16. 16. The anti-freeze valve of claim 15, wherein the guide sleeve (80) includes a sleeve (81) and a restricting ring (82) provided at one end of the sleeve (81), the outer diameter of the restricting ring (82) is larger than the outer diameter of the sleeve (81), one side of the restricting ring (82) abuts against the thermostat (30), the elastic member (51) is fitted to the sleeve (81), and one end of the elastic member (51) adjacent to the valve port (12) abuts against the other side of the restricting ring (82).

17. 17. The freeze protection valve according to claim 16, wherein the elastic member (51) is a spring, the outer diameter H of the sleeve (81) is smaller than the inner diameter I of the elastic member (51), and the outer diameter T of the limiting ring (82) is smaller than the inner diameter V of the valve chamber (11).

18. 16. The freeze prevention valve according to claim 15, wherein one end of the guide sleeve (80) away from the valve orifice (12) has a guide inclined surface (83), and one end of the valve seat (10) away from the valve orifice (12) has a diameter-reducing structure (13), and the diameter-reducing structure (13) abuts against one end of the elastic member (51) away from the valve orifice (12).

19. 16. The freeze prevention valve according to claim 15, wherein the thermostat (30) includes a guide shaft (31), a limiting shaft (32), and a drive shaft (33) connected in sequence, wherein the diameter of the limiting shaft (32) is larger than the diameters of the guide shaft (31) and the drive shaft (33), the drive shaft (33) is engaged with the valve core (20), the guide sleeve (80) is fitted onto the guide shaft (31), one end of the guide sleeve (80) adjacent to the valve port (12) abuts against the limiting shaft (32), and the inner diameter J of the guide sleeve (80) is larger than the outer diameter K of the guide shaft (31).

20. The valve core (20) has a guide hole (27), and the drive shaft (33) includes a drive segment (331), a pressure rod (332), and a guide segment (333) connected in this order, the drive segment (331) is connected to the limiting shaft (32), and the diameters of the pressure rod (332), the guide segment (333), and the drive segment (331) increase in this order, and the guide segment (333) is inserted into the guide hole (27), the outer wall of the guide segment (333) is engaged with the inner wall of the guide hole (27), and the end face of the guide segment (333) abuts against the bottom wall of the guide hole (27); 20. The freeze-proof valve of claim 19, wherein the opening of the guide hole (27) has a chamfer, the valve core (20) further has an assembly hole (28) communicating with the guide hole (27), the diameter of the assembly hole (28) is larger than the diameter of the guide hole (27), and the outer wall of the drive segment (331) is engaged with the inner wall of the assembly hole (28).

21. an elastic member (51) fitted to the thermostat (30); a guide sleeve (80) fitted to the thermostat (30) and the elastic member (51), the guide sleeve (80) extending along the extension direction of the valve chamber (11), at least a portion of the guide sleeve (80) being in close contact with the inner wall of the valve chamber (11), one end of the guide sleeve (80) adjacent to the valve orifice (12) being in contact with the thermostat (30), and one end of the elastic member (51) adjacent to the valve orifice (12) being in contact with the thermostat (30) or the guide sleeve (80); The freeze protection valve of claim 1 further comprising:

22. 22. The freeze prevention valve according to claim 21, wherein the thermostat (30) includes a guide shaft (31) and a limiting shaft (32) connected to each other, the limiting shaft (32) protruding from the guide shaft (31), the guide sleeve (80) includes a sleeve (81) and a limiting ring (82) connected to each other, the sleeve (81) and the guide shaft (31) are spaced apart, the limiting ring (82) has an attachment hole aligned with the guide shaft (31), the limiting ring (82) abuts against the limiting shaft (32), and the elastic member (51) is located between the guide shaft (31) and the sleeve (81).

23. 23. The freeze protection valve of claim 22, wherein the sleeve (81) has a first guide segment (811) and a second guide segment (812) connected to each other, the second guide segment (812) is connected to the restricting ring (82), the first guide segment (811) is in close contact with the inner wall of the valve chamber (11), and the second guide segment (812) and the inner wall of the valve chamber (11) are spaced apart.

24. 24. The freeze prevention valve according to claim 23, wherein a positioning flange (84) is formed between the first guide segment (811) and the second guide segment (812), and the elastic member (51) abuts against the positioning flange (84).

25. An anti-freeze valve as described in Claim 15, wherein the guide sleeve (80) guides the thermostat (30) and the elastic member (51).

26. 24. The anti-freeze valve of claim 23, wherein the second guide segment (812) has a through-hole (8121), and a gap between the second guide segment (812) and the inner wall of the valve chamber (11) forms a first flow gap, the through-hole (8121) connects the internal cavity of the guide sleeve (80) to the first flow gap, and the limiting shaft (32) and the inner wall of the valve chamber (11) are spaced apart to form a second flow gap, and the internal cavity of the guide sleeve (80), the through-hole (8121), the first flow gap, and the second flow gap constitute the first passage (41).

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