Anti-freezing device and water heater comprising same

Abstract

The application discloses an anti-freezing device and a water heater comprising the same. The anti-freezing device comprises a cavity, a valve core and a limiting piece. The valve core comprises a first end and a second end located inside and outside the cavity. A clamping part is arranged on the side wall of the valve core. The limiting piece is sleeved on the periphery of the valve core and is fixed relative to the cavity. An annular limiting track is arranged on the side wall of the limiting piece. The annular limiting track comprises oppositely arranged first and second guide surfaces. First and second grooves are alternately arranged on the second guide surface. The first and second grooves form a protruding part. When the clamping part is clamped at the first groove, water flows normally through the cavity. When the valve core moves towards the second end, the clamping part jumps over the protruding part under the abutting guidance of the first guide surface. When the valve core moves towards the first end, the clamping part moves to the second groove under the abutting guidance of the second guide surface. The valve core closes the cavity to avoid water flowing into the water heater in the case of pipe cracking.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and more specifically to an antifreeze device and a water heater containing the same. Background Technology

[0002] With the improvement of living standards and the convenience of timely hot water supply, household water heaters have become increasingly popular, and providing consumers with a comfortable and safe bathing environment is receiving more and more attention from industry professionals. However, current household water heaters have poor adaptability to environmental changes. For example, in cold winters, when outdoor temperatures are low, cold air can easily enter the water heater through the exhaust pipe, causing the water in the internal pipes to freeze. Due to the increased volume, the pipes can easily burst. When the temperature rises, the ice in the pipes melts. If the user does not notice this in time and turn off the antifreeze device, the entire unit will leak, causing water damage to the base plate, electrical leakage, and other property damage and safety issues. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defect that water in the internal pipes of water heaters in the prior art is prone to freezing in cold environments, which leads to pipe expansion and cracking, and to provide an antifreeze device and a water heater containing the same.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] An antifreeze device, characterized in that the antifreeze device comprises:

[0006] A cavity for the passage of water;

[0007] The valve core includes a first end located inside the cavity and a second end located outside the cavity along its axial direction. The valve core has a cavity inside and an annular limiting track is provided on the side wall of the valve core. The valve core can move along its axial direction and move to a first position and a second position respectively. When in the first position, the cavity is open, and when in the second position, the valve core closes the cavity.

[0008] A limiting member is disposed at the second end of the valve core and partially accommodated in the cavity. A snap-fit ​​portion is provided on the side wall of the limiting member. The limiting member is rotatable about the extension direction from the first end to the second end and can switch between a first angle and a second angle.

[0009] The limiting member includes a limiting end, and the antifreeze device includes a blocking part; at the first angle, the limiting end is limited by the blocking part from the second end direction to the first end direction, so that the valve core is located in the first position; at the second angle, the blocking part does not interfere with the limiting end, so that the valve core can move to the second position;

[0010] The snap-fit ​​part is movably disposed within the annular limiting track. The annular limiting track includes a first guide surface and a second guide surface that are sequentially arranged opposite each other along the direction from the first end to the second end of the valve core. The second guide surface has a first groove and a second groove at different positions in the circumferential direction of the annular limiting track, and a protrusion is formed between the first groove and the second groove.

[0011] When the valve core moves toward its second end, the locking part leaps over the protrusion under the abutment guidance of the first guide surface, so that when the valve core moves further toward its first end, the locking part moves from the first groove to the second groove under the abutment guidance of the second guide surface, and the limiting member rotates from the first angle to the second angle, so that the valve core can move to the second position.

[0012] In this design, the locking part of the limiting member can move within the annular limiting track of the valve core, allowing the valve core to move and simultaneously rotate the limiting member. Under normal use, the locking part engages with the first groove on the second guide surface, limiting the valve core and preventing it from blocking water flow. When the outdoor temperature is low, cold air enters the water heater through the exhaust pipe, causing the water inside the cavity to freeze. The freezing water exerts an external force on the first end of the valve core, causing it to move towards the second end. During this movement, the valve core pushes the limiting member, and the locking part of the limiting member moves accordingly within the annular limiting track and abuts against the first guide surface. Guided by the first guide surface, it moves over the protrusion, causing the limiting member to rotate. When the outdoor temperature rises or ice melts due to other reasons, the valve core moves towards its first end. The locking part abuts against the second guide surface and, guided by the second guide surface, moves to the second groove adjacent to the first groove. This causes the limiting member to rotate further and no longer limit the valve core, allowing the valve core to reset and seal the cavity. If the pipes inside the water heater have already frozen and cracked, the antifreeze device can prevent water from entering the water heater, thus avoiding leaks that could cause water damage to the base plate, electrical leaks, and other property and safety issues.

[0013] Preferably, the blocking part includes a through hole, the length and width of the through hole are not equal, the length and width of the limiting end are both smaller than the length and width of the through hole, and the length of the longer end of the limiting end is greater than the length of the shorter end of the through hole.

[0014] In this design, the through-hole of the blocking part allows the limiting end of the valve core to pass through the blocking part from one side to the other side when the valve core moves towards the second end. When the valve core begins to move towards the first end, the limiting end can no longer pass through the blocking part and is thus limited. The through-hole has inconsistent length and width, resulting in a longer end and a shorter end. The longer end allows the limiting end to pass through, while the shorter end limits the limiting end. The limiting end can be adjusted by rotation to allow it to pass through the through-hole or be limited.

[0015] Preferably, the antifreeze device further includes an extension sleeve, which is connected to the cavity and extends outward in the radial direction of the cavity. The second end of the valve core is disposed inside the extension sleeve, and the valve core separates the cavity from the extension sleeve. The blocking portion is formed at the end of the extension sleeve away from the cavity.

[0016] In this solution, by connecting an extension sleeve to the side wall of the cavity, the valve core is limited within the extension sleeve, allowing the valve core to move along a specific trajectory and further preventing the valve core from detaching from the cavity during movement. On the other hand, the extension sleeve structure can also be used to fix the limiting component, making it easier to fix the limiting component relative to the cavity.

[0017] Preferably, the valve core includes a first part and a second part connected to each other, the end face of the first part away from the cavity is the first guide surface, and the end face of the second part near the cavity is the second guide surface. The first guide surface and the second guide surface are spaced apart to form the annular limiting track.

[0018] In this design, the valve core includes a first part and a second part. The first guide surface is the end face of the first part, and the second guide surface is the end face of the second part. Therefore, the end faces of the first guide surface and the second guide surface can be arranged opposite each other to form a ring-shaped limiting track, which is more convenient in processing and manufacturing.

[0019] Preferably, the sidewall of the first part extends outward in the radial direction to form a first connecting plate, and the end face of the second part away from the cavity is provided with a second connecting plate. A connecting post is provided between the first connecting plate and the second connecting plate to connect and fix the first part and the second part.

[0020] In this solution, with this configuration, when the end faces of the first part and the second part cooperate to form an annular limiting track, the first connecting plate extending radially outward from the first part and the second connecting plate on the second part are connected by connecting columns, so that the first part and the second part can be fixed together, thereby ensuring that the shape of the annular limiting track will not change.

[0021] Preferably, the antifreeze device further includes a first elastic element, one end of which abuts against the second end of the valve core, and the other end is fixed to the blocking part;

[0022] When the snap-fit ​​part snaps into the first groove, the elastic element is in a compressed state and applies a restoring force to the second end of the valve core, moving towards the first end.

[0023] In this design, when the outdoor temperature rises or ice melts due to other reasons, the valve core can move more towards its first end so that the locking part can lock into the second groove, thereby sealing the cavity.

[0024] Preferably, the antifreeze device further includes a second elastic element, which is located in the cavity, with one end of the second elastic element abutting against the first end of the valve core and the other end abutting against the limiting element;

[0025] When the snap-fit ​​part snaps into the first groove, the second elastic member is in its natural state.

[0026] In this design, the valve core and the limiting element are connected by an elastic element, allowing both to transmit force while maintaining a certain degree of elastic freedom. This facilitates the movement of the locking element within the groove.

[0027] Preferably, there are two snap-fit ​​components, which are respectively disposed on both sides of the limiting component.

[0028] In this design, the snap-fit ​​mechanism is improved and the force distribution is more balanced.

[0029] Preferably, the valve core has a limiting groove for aligning and engaging with the limiting strip on the extension sleeve.

[0030] In this design, the valve core is prevented from rotating, ensuring that only the locking element rotates when the valve core and the locking element move relative to each other.

[0031] A water heater, characterized in that the water heater comprises: a water heater body;

[0032] As described above, the outlet of the antifreeze device is connected to the inlet of the water heater body.

[0033] In this design, the locking part of the antifreeze device in this water heater moves within a ring-shaped limiting track, thereby causing the valve core to move relative to the limiting member. Under normal use, the locking part engages with the first groove on the second guide surface, limiting the valve core and preventing it from blocking water flow. When the outdoor temperature is low, cold air enters the water heater through the exhaust pipe, causing the water inside the cavity to freeze continuously. The frozen water exerts an external force on the first end of the valve core, causing it to move towards its second end. During this movement, the locking part abuts against the first guide surface and moves under its guidance, overcoming the protrusion. When the outdoor temperature rises or the ice melts due to other reasons, the valve core moves towards its first end, and the locking part abuts against the second guide surface. Guided by the second guide surface, it moves to the second groove adjacent to the first groove, thus sealing the cavity. If the pipes inside the water heater have already frozen and cracked, the antifreeze device can prevent water from flowing into the water heater, thereby avoiding water leakage from the entire unit, which could cause property damage and safety issues such as water damage to the base plate and electrical leakage.

[0034] The positive and progressive effects of this invention are as follows:

[0035] The locking part of the limiting component can move within the annular limiting track of the valve core, so that the movement of the valve core drives the movement of the limiting component, causing the limiting component to rotate synchronously. Under normal use, the locking part engages with the first groove on the second guide surface, limiting the valve core and preventing it from blocking water flow. When the outdoor temperature is low, cold air enters the water heater through the exhaust pipe, causing the water inside the cavity to freeze continuously. The frozen water exerts an external force on the first end of the valve core, causing it to move towards the second end. During this movement, the valve core pushes the limiting component, and the locking part of the limiting component moves accordingly within the annular limiting track and abuts against the first guide surface. Guided by the first guide surface, it moves over the protrusion, causing the limiting component to rotate. When the outdoor temperature rises or ice melts due to other reasons, the valve core moves towards its first end. The locking part abuts against the second guide surface and, guided by the second guide surface, moves to the second groove adjacent to the first groove. This causes the limiting member to rotate further and no longer limit the valve core, allowing the valve core to reset and seal the cavity. If the pipes inside the water heater have already frozen and cracked, the antifreeze device can prevent water from entering the water heater, thus avoiding leaks that could cause water damage to the base plate, electrical leaks, and other property and safety issues. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the exploded structure of the antifreeze device according to an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of the external structure of the antifreeze device according to an embodiment of the present invention.

[0038] Figure 3 This is a schematic diagram of the assembly structure of the valve core and the limiting component according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the unfolded annular limiting track according to an embodiment of the present invention.

[0040] Figure 5(a) is a schematic diagram of the valve core and limiting member of the antifreeze device according to an embodiment of the present invention in normal working condition.

[0041] Figure 5(b) is a schematic diagram of the state of the valve core and limiting member of the antifreeze device according to an embodiment of the present invention after the liquid in the cavity freezes.

[0042] Figure 5(c) is a schematic diagram of the state of the valve core and limiting member of the antifreeze device according to an embodiment of the present invention after the ice melts in the cavity.

[0043] Figure 6(a) is a schematic diagram of the antifreeze device of the present invention in normal working condition.

[0044] Figure 6(b) is a schematic diagram of the internal structure of the antifreeze device in normal working condition according to an embodiment of the present invention.

[0045] Figure 7(a) is a schematic diagram of the state of the antifreeze device in the cavity after the ice melts, according to an embodiment of the present invention.

[0046] Figure 7(b) is a schematic diagram of the internal structure of the antifreeze device in the cavity after the ice melts, according to an embodiment of the present invention.

[0047] Explanation of reference numerals in the attached figures:

[0048] Antifreeze device 1

[0049] Cavity 100

[0050] First partition 110

[0051] Second partition 120

[0052] Third partition 130

[0053] Third outlet 131

[0054] Valve core 200

[0055] Limiting groove 201

[0056] Valve core first end 210

[0057] Part 1, 2101

[0058] First guiding surface 211

[0059] 220 valve core second end

[0060] Part 2, Episode 2201

[0061] Second guide surface 221

[0062] First groove 222

[0063] Second groove 223

[0064] Protrusion 224

[0065] Circular limiting track 230

[0066] Connecting column 240

[0067] Limiting component 300

[0068] 310 Connector

[0069] Limit end 320

[0070] Extension sleeve 400

[0071] Barrier section 410

[0072] Through hole 411

[0073] Limiting strip 420

[0074] First elastic element 501

[0075] Second elastic element 502 Detailed Implementation

[0076] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0077] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and "radial," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0079] This embodiment discloses a water heater, which includes a water heater body and an antifreeze device 1. The outlet of the antifreeze device 1 is connected to the inlet of the water heater body. It is used to prevent the water heater from freezing, cracking, and leaking when it has not been used for a long time in a cold environment.

[0080] like Figure 1 , Figure 2 As shown in the figure, this embodiment discloses an antifreeze device 1, which includes a cavity 100 and a valve core 200. The cavity 100 is used for the passage of water. The valve core 200 includes a first end 210 located within the cavity 100 along its axial direction and a second end 220 located outside the cavity 100. The valve core 200 has a cavity inside, and an annular limiting track 230 is provided on the side wall of the valve core 200. The valve core 200 can move along its axial direction and move to a first position and a second position respectively. In the first position, the cavity 100 is open, and in the second position, the valve core 200 closes the cavity 100. A limiting member 300 is disposed at the second end 220 of the valve core 200 and partially accommodated in the cavity. A snap-fit ​​portion 310 is provided on the side wall of the limiting member 300. The limiting member 300 can rotate about the extension direction from the first end 210 to the second end 220 as an axis and switch between a first angle and a second angle. The limiting member 300 includes a limiting end 320. The antifreeze device 1 includes a blocking part 410; at a first angle, the limiting end 320 is limited by the blocking part 410 from the second end 220 towards the first end 210, so that the valve core 200 is in the first position; at a second angle, the blocking part 410 does not interfere with the limiting end 320, so that the valve core 200 can move to the second position; the snap-fit ​​part 310 is movably disposed in the annular limiting track 230, the annular limiting track 230 includes a first guide surface 211 and a second guide surface 221 arranged sequentially opposite to each other along the direction from the first end 210 to the second end 220 of the valve core 200, the second guide surface 221 has a first groove 222 and a second groove 223 at different positions in the circumferential direction of the annular limiting track 230, and a protrusion 224 is formed between the first groove 222 and the second groove 223.

[0081] When the valve core 200 moves toward its second end 220, the locking part 310 leaps over the protrusion 224 under the abutment guidance of the first guide surface 211, so that when the valve core 200 moves further toward its first end 210, the locking part 310 can move from the first groove 222 to the second groove 223 under the abutment guidance of the second guide surface 221, and the limiting member 300 rotates from the first angle to the second angle, so that the valve core 200 can move to the second position.

[0082] In this embodiment, the specific working principle of the antifreeze device 1 is as follows:

[0083] The valve core 200 of the antifreeze device 1 is movable and can move towards the first end 210 to close the cavity 100. The valve core 200 and the limiting member 300 are connected and can both move in the directions of the first end 210 and the second end 220 and can drive each other. An annular limiting track 230 extending perpendicular to the movement direction of the valve core 200 is provided on the valve core 200. The annular limiting track 230 is provided with a first guide surface 211 and a second guide surface 221 that can be tilted in a specific direction along the directions of the first end 210 and the second end 220. When the limiting member 300 moves, the locking part 310 can contact the guide surface within the annular limiting track 230 of the valve core 200 and, under the action of the inclined side, convert part of the movement along the direction of the first end 210 and the second end 220 into movement along the extension direction of the annular limiting track 230 (in this embodiment, the movement is perpendicular to the direction of the first end 210 and the second end 220), thereby causing the valve core 200 to move and drive the limiting member 300 to move, while simultaneously causing the limiting member 300 to rotate relative to the valve core 200.

[0084] The limiting member 300 can be rotated to switch between a state where it is limited at the blocked end and a state where it is not limited at the blocked end. When the water heater is in normal use, as shown in Figures 6(a), 6(b) and 5(a), the snap-fit ​​part 310 snaps into the first groove 222 of the second guide surface 221. At this time, the limiting member 300 is at the first angle and its limiting end 320 is limited by the blocked end, so that the valve core 200 is limited by the limiting member 300 in the first position and thus does not play the role of blocking the water flow. When the outdoor temperature is low, cold air enters the interior of the water heater through the exhaust pipe, causing the water inside the cavity 100 to freeze continuously, as shown in Figure 5(b). After the water freezes, it applies an external force to the first end 210 of the valve core 200, causing the valve core 200 to move toward its second end 220. During the movement, the valve core 200 pushes the limiting member 300 to move, and the locking part 310 of the limiting member 300 moves accordingly in the annular limiting track 230 and abuts against the first guide surface 211. Under the guidance of the first guide surface 211, it moves over the protrusion 224, causing the limiting member 300 to rotate. When the outdoor temperature rises or the ice melts due to other reasons, as shown in Figures 5(c), 7(a), and 7(b), the valve core 200 moves towards its first end 210. The locking part 310 abuts against the second guide surface 221 and moves under the guidance of the second guide surface 221 to the second groove 223 adjacent to the first groove 222. This causes the limiting member 300 to rotate further to the second angle. At this time, the limiting end 320 of the limiting member 300 is no longer restricted by the blocking end, allowing the limiting member 300 to move towards the first end 210 and no longer restrict the valve core 200. This allows the valve core 200 to continue moving towards the first end 210 and eventually move to the second position, so that the valve core 200 can be reset and seal the cavity 100. If the pipes inside the water heater have frozen and cracked, the antifreeze device 1 can prevent water from flowing into the water heater, thereby avoiding water leakage from the whole unit, causing water damage to the bottom plate, electrical leakage, and other property damage and safety problems.

[0085] like Figure 1 , Figure 2 As shown in Figures 6(a) and 7(a), the blocking part 410 includes a through hole 411. The length and width of the through hole 411 are not equal. The length and width of the limiting end 320 are both smaller than the length and width of the through hole 411, and the length of the longer end of the limiting end 320 is greater than the length of the shorter end of the through hole 411.

[0086] In this embodiment, the through hole 411 of the blocking part 410 allows the limiting end 320 of the valve core 200 to pass through the blocking part 410 from one side to the other side when the valve core 200 moves towards the second end 220. When the valve core 200 begins to move towards the first end 210, the limiting end 320 is prevented from passing through the blocking part 410 and is thus limited. The through hole 411 has an inconsistent length and width, with a longer end for the limiting end 320 to pass through and a shorter end for limiting the limiting end 320. The limiting end 320 can be rotated to adjust its angle to pass through the through hole 411 or to be limited.

[0087] like Figure 2 As shown, the antifreeze device 1 also includes an extension sleeve 400, which is connected to the cavity 100 and extends outward along the radial direction of the cavity 100. The second end 220 of the valve core 200 is disposed inside the extension sleeve 400. The valve core 200 separates the cavity 100 and the extension sleeve 400. The blocking part 410 is opened at the end of the extension sleeve 400 away from the cavity 100.

[0088] The extension sleeve 400 is a hollow structure that extends outward from the side wall of the cavity 100. The extension sleeve 400 and the cavity 100 are perpendicular to the water flow direction and extend outward, so that the valve core 200 can laterally cut off the water flow to complete the closure of the valve cavity. The entire movement of the valve core 200 is also perpendicular to the water flow direction.

[0089] In this embodiment, by connecting an extension sleeve 400 to the side wall of the cavity 100, the valve core 200 is limited within the extension sleeve 400, so that the movement of the valve core 200 can follow a specific trajectory, and can further prevent the valve core 200 from detaching from the cavity 100 during the movement; on the other hand, the extension sleeve 400 structure can also be used to fix the limiting member 300, so that the limiting member 300 can be more easily fixed relative to the cavity 100.

[0090] like Figure 1 , Figure 3 As shown, the valve core 200 includes a first part 2101 and a second part 2201 that are connected to each other. The end face of the first part 2101 away from the cavity 100 is a first guide surface 211, and the end face of the second part 2201 close to the cavity 100 is a second guide surface 221. The first guide surface 211 and the second guide surface 221 are spaced apart to form an annular limiting track 230.

[0091] In this embodiment, the valve core 200 includes a first part 2101 and a second part 2201. The first guide surface 211 is the end face of the first part 2101, and the second guide surface 221 is the end face of the second part 2201. Therefore, the end faces of the first guide surface 211 and the second guide surface 221 can be arranged opposite to each other to form an annular limiting track 230, which is more convenient in processing and manufacturing.

[0092] The unfolded diagram of the annular limiting track 230 in this embodiment is shown below. Figure 4 As shown, the annular limiting track 230 has serrated structures on the first part 2101 and the second part 2201, forming a first groove 222, a second groove 223, a protrusion 224, a first guide surface 211, and a second guide surface 221, respectively. The first groove 222 and the second groove 223 are arranged alternately and adjacently, and the annular limiting track 230 has multiple first grooves 222 and second grooves 223 arranged alternately to form a closed ring, so that the limiting member 300 can repeatedly move and rotate alternately in one direction within the annular limiting track 230 along the first groove 222 and the second groove 223 during movement. The protrusion is formed between the two grooves, and the inclined edge of the protrusion 224 forms a guide surface.

[0093] like Figure 1 , Figure 3 As shown, the sidewall of the first part 2101 extends outward in the radial direction to form a first connecting plate, and the end face of the second part 2201 away from the cavity 100 is provided with a second connecting plate. A connecting post 240 is provided between the first connecting plate and the second connecting plate to connect and fix the first part 2101 and the second part 2201.

[0094] In this embodiment, when the end faces of the first part 2101 and the second part 2201 cooperate to form an annular limiting track 230, the first connecting plate extending radially outward from the first part 2101 and the second connecting plate on the second part 2201 are connected by the connecting post 240, so that the first part 2101 and the second part 2201 can be fixed together, thereby ensuring that the shape of the annular limiting track 230 will not change.

[0095] like Figure 1 As shown, the antifreeze device 1 also includes a first elastic member, one end of which abuts against the second end 220 of the valve core 200, and the other end is fixed to the blocking part 410.

[0096] When the snap-fit ​​part 310 snaps into the first groove 222, the elastic element is in a compressed state and applies a restoring force to the second end 220 of the valve core 200 in the direction of moving toward the first end 210.

[0097] In this embodiment, when the outdoor temperature rises or the ice melts due to other reasons, the valve core 200 can move better toward its first end 210 so that the snap-fit ​​part 310 can snap into the second groove 223, thereby sealing the cavity 100.

[0098] like Figure 1 As shown, the antifreeze device 1 also includes a second elastic element, which is located in the cavity. One end of the second elastic element abuts against the first end 210 of the valve core 200, and the other end abuts against the limiting member 300.

[0099] When the snap-fit ​​part 310 snaps into the first groove 222, the second elastic member is in its natural state.

[0100] In this embodiment, the valve core 200 and the limiting member 300 are connected by an elastic element, which allows both to transmit force while maintaining a certain degree of elastic freedom. This facilitates the movement of the snap-fit ​​component within the groove.

[0101] like Figure 1 As shown in Figure 6, there are two snap-fit ​​components, which are respectively located on both sides of the limiting component 300.

[0102] In this embodiment, the snap-fit ​​effect is better and the force is more balanced.

[0103] like Figure 1 As shown in Figures 6(b) and 7(b), the valve core 200 has a limiting groove 201 for aligning and cooperating with the limiting strip 420 on the extension sleeve 400.

[0104] In this embodiment, the valve core 200 can be prevented from rotating, so that only the locking member rotates when the valve core 200 and the locking member move relative to each other.

[0105] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A freeze protection device, characterized in that, The anti-freezing device comprises: a cavity for water flow passing through; a valve core comprising a first end inside the cavity and a second end outside the cavity along the axial direction of the valve core, the valve core having a cavity inside, and a side wall of the valve core being provided with an annular limiting track, the valve core being capable of moving along the axial direction and moving to a first position and a second position respectively, at the first position, the cavity being open, at the second position, the valve core closing the cavity; a limiting piece provided at the second end of the valve core and partially contained in the cavity, a side wall of the limiting piece being provided with a clamping part, the limiting piece being capable of rotating along the extension direction from the first end to the second end and switching between a first angle and a second angle; the limiting piece comprising a limiting end, the anti-freezing device comprising a blocking part; at the first angle, the limiting end is limited by the blocking part from the second end to the first end, so that the valve core is located at the first position; at the second angle, the blocking part does not interfere with the limiting end, so that the valve core can move to the second position; the clamping part is movably arranged in the annular limiting track, the annular limiting track comprising a first guide surface and a second guide surface arranged opposite in sequence along the direction from the first end to the second end of the valve core, the second guide surface having a first groove and a second groove at different positions in the circumferential direction of the annular limiting track, and a protrusion being formed between the first groove and the second groove; when the valve core moves towards the second end, the clamping part jumps over the protrusion under the abutting guidance of the first guide surface, so that the clamping part can move from the first groove to the second groove under the abutting guidance of the second guide surface when the valve core further moves towards the first end, and the limiting piece rotates from the first angle to the second angle, so that the valve core can move to the second position.

2. The freeze protection apparatus of claim 1, wherein The blocking part comprises a through hole, the length and width of the through hole are not equal, the length and width of the limiting end are smaller than the length and width of the through hole, and the length of the longer end of the limiting end is greater than the shorter end of the through hole.

3. The freeze protection apparatus of claim 1, wherein The anti-freezing device further comprises an extension sleeve connected to the cavity and extending outwardly along the radial direction of the cavity, the second end of the valve core is arranged in the extension sleeve, the valve core separates the cavity and the extension sleeve, and the blocking part is arranged at the end of the extension sleeve away from the cavity.

4. The freeze protection apparatus of claim 1, wherein The valve core comprises a first part and a second part connected to each other, the end face of the first part away from the cavity is the first guide surface, and the end face of the second part close to the cavity is the second guide surface, the first guide surface and the second guide surface are arranged in a spaced manner to form the annular limiting track.

5. The freeze protection apparatus of claim 4, wherein The side wall of the first part extends outwardly along the radial direction to form a first connecting plate, the end face of the second part away from the cavity is provided with a second connecting plate, and a connecting column is arranged between the first connecting plate and the second connecting plate to connect and fix the first part and the second part.

6. The freeze protection apparatus of claim 1, wherein The anti-freezing device further comprises a first elastic member, one end of the first elastic member abutting against the second end of the valve core, and the other end fixed with the blocking part; When the clamping part is clamped at the first groove, the elastic member is in a forced compression state and exerts a restoring force on the second end of the valve core to move toward the first end.

7. The freeze protection apparatus of claim 1, wherein The anti-freezing device further comprises a second elastic member, one end of the second elastic member abutting against the first end of the valve core, and the other end abutting against the limiting member; When the clamping part is clamped at the first groove, the second elastic member is in a natural state.

8. The freeze protection apparatus of claim 1, wherein, The clamping part has two clamping parts respectively arranged on both sides of the limiting member.

9. The freeze protection apparatus of claim 3, wherein, The valve core is provided with a limiting groove for alignment with the limiting strip on the extension sleeve.

10. A water heater, characterized by The water heater comprises: a water heater body; The anti-freezing device according to any one of claims 1 to 9, wherein the water outlet of the anti-freezing device is connected with the water inlet end of the water heater body.

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