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 sleeve. 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 sleeve is arranged 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 sleeve. The annular limiting track comprises oppositely arranged first and second guide surfaces. First and second grooves are alternately arranged on the first 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 second 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 first 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] The present application relates to the technical field of water heaters, in particular to a freeze-proof device and a water heater comprising the same. BACKGROUND

[0002] With the improvement of living standards and the convenience of household water heaters in supplying hot water, household water heaters have gradually become popular, and providing consumers with a comfortable and safe bathing environment has attracted more and more attention from people in the industry. However, the existing household water heaters have poor adaptability to environmental changes. For example, in cold winter, the outdoor temperature is low, and the cold air from outside is easy to enter the interior of the water heater along the exhaust pipe, causing the water in the internal pipeline of the water heater to freeze and the pipeline to burst due to the increase in volume. When the temperature rises, the ice in the pipeline melts, and if the user does not timely close the freeze-proof device, the whole machine will leak, causing the bottom plate to be soaked in water, electrical leakage and other property losses and safety problems. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defect that the water in the internal pipeline of the water heater easily freezes in a cold environment and causes the pipeline to burst, and to provide a freeze-proof device and a water heater comprising the same.

[0004] The present application solves the above technical problems by the following technical scheme:

[0005] A freeze-proof device, characterized in that the freeze-proof device comprises: a cavity for the passage of water flow; a valve core comprising a first end located in the cavity and a second end located outside the cavity, a clamping portion being provided on the side wall of the valve core; a limiting sleeve being sleeved on the periphery of the valve core and being fixed relative to the cavity, an annular limiting track being formed on the side wall of the limiting sleeve and surrounding the periphery of the valve core, the clamping portion being movably arranged in the annular limiting track, the annular limiting track comprising a first guide surface and a second guide surface which are arranged opposite to each other in the direction from the first end to the second end of the valve core, a first groove and a second groove being continuously and alternately arranged on the first guide surface, and a protrusion being formed between the first groove and the second groove.

[0006] When the clamping portion is clamped at the first groove, the limiting sleeve limits the valve core to make the water flow pass through the cavity; when the valve core moves towards the second end thereof, the clamping portion jumps over the protrusion under the abutting guidance of the second guide surface, and when the valve core further moves towards the first end thereof, the clamping portion moves to the second groove under the abutting guidance of the first guide surface, so that the valve core closes the cavity.

[0007] In the scheme, through the arrangement, the clamping portion moves in the annular limiting track, thereby driving the valve core to move relative to the limiting sleeve. When the water heater is in normal use, the clamping portion is clamped at the first groove of the first guide surface, so that the valve core is limited and cannot block the water flow. When the outdoor temperature is low, cold air enters the interior of the water heater along the exhaust pipe, causing the water in the cavity to freeze. After the water freezes, an external force is applied to the first end of the valve core, driving the valve core to move towards the second end. In the moving process, the clamping portion abuts against the second guide surface and moves under the guidance of the second guide surface to jump over the protruding portion. When the outdoor temperature rises or the ice melts due to other reasons, the valve core moves towards the first end, the clamping portion abuts against the first guide surface and moves to the second groove adjacent to the first groove under the guidance of the first guide surface, thereby driving the valve core to close the cavity. At this time, if the pipeline in the water heater has been frozen, the anti-freezing device can prevent water flow from entering the water heater, thereby avoiding water leakage of the whole machine, causing the floor to be soaked in water, electrical leakage and other property losses and safety problems.

[0008] Further, the first protrusion and the second protrusion are respectively arranged on the second guide surface corresponding to the first groove and the second groove, and a groove portion is formed between the first protrusion and the second protrusion corresponding to the protruding portion; when the valve core moves towards the second end, the clamping portion jumps over the protruding portion to the groove portion under the abutting guidance of the second guide surface; when the valve core moves towards the first end, the clamping portion jumps over the second protrusion to the second groove under the abutting guidance of the first guide surface.

[0009] In the scheme, the first guide surface and the second guide surface are arranged to maintain a parallel state, thereby preventing the overall width of the annular limiting track from changing greatly. Further, the positions of the grooves and the protrusions are arranged on the first guide surface and the second guide surface as needed. When the valve core moves in a specific direction, the clamping portion on the valve core can be guided to a specific position under the abutting guidance of the first guide surface or the second guide surface, thereby meeting specific requirements. The overall structure is simple and convenient to operate.

[0010] Further, the opening directions of the first groove and the second groove and the protruding directions of the protruding portion are consistent with the moving direction of the valve core towards the second end.

[0011] In the scheme, the opening directions of the first groove and the second groove are arranged to hook the clamping portion in the form of a hook, thereby further meeting the requirements of limiting the valve core by the limiting sleeve or sealing the cavity by the valve core.

[0012] Further, the first groove and the second groove are adjacent to each other and are spaced apart by an angle of α degrees in the circumferential direction of the limiting sleeve, wherein α is an integer multiple of 180 degrees; the number of the clamping portions is plural, the plural clamping portions are spaced apart by an angle of β degrees in the circumferential direction of the valve core, wherein β is an integer multiple of 360 degrees and is an even multiple of α.

[0013] In the scheme, the clamping portions on the valve core are provided in plural, the plural clamping portions on the valve core are simultaneously moved under the abutting guidance of the first guide surface and the second guide surface during the movement of the valve core, the movement trajectories of the plural clamping portions are the same, the plural clamping portions are more conveniently rotated simultaneously during the movement of the valve core, and the position switching in the first groove and the second groove is satisfied.

[0014] Further, the limiting sleeve comprises a first limiting portion and a second limiting portion connected to each other, the end surface of the first limiting portion away from the cavity is the first guide surface, the end surface of the second limiting portion close to the cavity is the second guide surface, and the first guide surface and the second guide surface are spaced apart to form the annular limiting track.

[0015] In the scheme, the limiting sleeve comprises the first limiting portion and the second limiting portion, the end surface of the first limiting portion is the first guide surface, and the end surface of the second limiting portion is the second guide surface, so that the first guide surface and the second guide surface are oppositely arranged to form the annular limiting track, which is more convenient in processing and manufacturing.

[0016] Further, the side wall of the first limiting portion extends outward in the radial direction to form a first connecting plate, the end surface of the second limiting portion 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 limiting portion and the second limiting portion.

[0017] In the scheme, in the case that the end surfaces of the first limiting portion and the second limiting portion cooperatively form the annular limiting track, the first connecting plate of the first limiting portion extending outward in the radial direction and the second connecting plate of the second limiting portion are connected by the connecting column, so that the first limiting portion and the second limiting portion can be fixed, and the shape of the annular limiting track is ensured not to change.

[0018] Further, the anti-freezing device further comprises an extension sleeve connected to the cavity and extending outward in the radial direction of the cavity, the first end of the valve core is arranged in the extension sleeve and is movable in the axial direction of the extension sleeve; the limiting sleeve is connected to the extension sleeve and is fixed relative to the cavity through the extension sleeve.

[0019] In the scheme, the valve core is limited in the extension sleeve by connecting the extension sleeve on the side wall of the cavity, so that the movement of the valve core can be along a certain trajectory, preventing the valve core from escaping from the cavity during movement. On the other hand, the extension sleeve can also be connected with the limiting sleeve, so that the limiting sleeve is more convenient to fix relative to the cavity, so that the annular limiting track on the limiting sleeve does not move.

[0020] Further, the anti-freezing device further comprises a sealing member, which is clamped on the periphery of the first end of the valve core.

[0021] In the scheme, by clamping the sealing member on the periphery of the first end of the valve core, the valve core drives the sealing member to move during movement, thereby ensuring that the liquid does not leak at the connection between the valve core and the cavity.

[0022] Further, the anti-freezing device further comprises an elastic member, which is arranged on the periphery of the valve core, and the two ends of the elastic member abut against the first end of the valve core and the limiting sleeve, respectively.

[0023] In the scheme, when the outdoor temperature rises or the ice melts due to other reasons, the valve core can better move towards the first end, so that the clamping part can be clamped in the second groove, thereby closing the cavity.

[0024] Further, the inside of the cavity is spaced apart in the radial direction thereof and is provided with a first partition plate and a second partition plate, and the first partition plate and the second partition plate form a first flow passage and a second flow passage, respectively, between the side wall of the cavity; the inside of the cavity is provided with a third partition plate in the axial direction thereof, and the third partition plate is provided with a third flow passage, and the third partition plate is connected to the first partition plate and the second partition plate, respectively, and the water flow in the cavity flows through the first flow passage, the third flow passage and the second flow passage in sequence.

[0025] In the scheme, by such a setting, the water flow in the cavity passes through the first flow passage or the second flow passage and then flows out from the third flow passage which is opened in the radial direction of the cavity. At this time, the valve core only needs to abut against the third flow passage to close the cavity. Compared with completely closing the cavity, it is simple and reliable, and it does not hinder the water flow in the cavity during normal use of the water heater.

[0026] A water heater, characterized in that the water heater comprises a water heater body and an anti-freezing device as described above, and the water outlet of the anti-freezing device is connected with the water inlet end of the water heater body.

[0027] In the scheme, the anti-freezing device is applied to the water heater body, which effectively solves the problem that the water in the pipeline of the water heater is prone to freezing in cold environment and causes the pipeline to burst.

[0028] The positive progress effect of the present application is that:

[0029] The clamping portion of the valve core moves in the annular limiting track, thereby driving the valve core to move relative to the limiting sleeve. When the water heater is in normal use, the clamping portion is clamped at the first groove of the first guide surface, so that the valve core is limited and cannot block the water flow. When the outdoor temperature is low, cold air enters the interior of the water heater along the smoke exhaust pipe, causing the water in the cavity to continuously freeze. After the water freezes, an external force is applied to the first end of the valve core, which drives the valve core to move towards the second end thereof. In the moving process, the clamping portion abuts against the second guide surface and moves under the guidance of the second guide surface to jump over the protruding portion. When the outdoor temperature rises or the ice melts due to other reasons, the valve core moves towards the first end thereof, the clamping portion abuts against the first guide surface and moves to the second groove adjacent to the first groove under the guidance of the first guide surface, so as to drive the valve core to close the cavity. At this time, if the pipeline in the water heater has been frozen and cracked, the anti-freezing device can prevent the water flow from entering the water heater, thereby avoiding the water leakage of the whole machine, the water soaking of the bottom plate, the electrical leakage and other property losses and safety problems. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a whole structure schematic view of the anti-freezing device in the embodiment 1 of the present application.

[0031] Figure 2 It is a whole explosion structure schematic view of the anti-freezing device in the embodiment 1 of the present application.

[0032] Figure 3 It is a structure schematic view of the valve core in the embodiment 1 of the present application.

[0033] Figure 4 It is a structure schematic view of the limiting sleeve in the embodiment 1 of the present application (one).

[0034] Figure 5 It is a structure schematic view of the limiting sleeve in the embodiment 1 of the present application (two).

[0035] Figure 6 It is an unfolding schematic view of the annular limiting track in the embodiment 1 of the present application.

[0036] Figure 7 It is an assembly structure schematic view of the cavity and the extension sleeve in the embodiment 1 of the present application.

[0037] Figure 8 It is a front structure schematic view of the anti-freezing device in the embodiment 1 of the present application in the open state.

[0038] Figure 9 FIG. 1 is a schematic view of a front structure of a freeze-proof device according to an embodiment of the present application. Figure 8 FIG. 2 is a schematic view of a partial enlarged view of A of FIG. 1.

[0039] Figure 10 FIG. 3 is a schematic view of a front structure of the freeze-proof device in a closed state according to an embodiment of the present application.

[0040] Figure 11 FIG. 4 is a schematic view of a partial enlarged view of B of FIG. 1. Figure 10

[0041] BRIEF DESCRIPTION OF DRAWINGS

[0042] freeze-proof device 1

[0043] cavity 100

[0044] first partition 110

[0045] second partition 120

[0046] third partition 130

[0047] third through-flow opening 131

[0048] valve core 200

[0049] first end 210 of valve core

[0050] sealing groove 211

[0051] second end 220 of valve core

[0052] clamping portion 230

[0053] limiting sleeve 300

[0054] first limiting portion 310

[0055] second limiting portion 320

[0056] annular limiting track 330

[0057] first recess 341

[0058] second recess 342

[0059] protruding portion 343

[0060] first protrusion 351

[0061] second protrusion 352

[0062] recessed portion 353

[0063] first connecting plate 360

[0064] second connecting plate 370 ​

[0065] connecting column 380

[0066] extension sleeve 400

[0067] elastic member 500 DETAILED DESCRIPTION

[0068] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application are within the scope of protection of the present application.

[0069] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0070] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0071] Example 1

[0072] The present embodiment provides a freeze-proof device 1, as shown in Figure 1 and Figure 2 As a whole, the freeze-proof device 1 mainly comprises a cavity 100, a valve core 200, a limiting sleeve 300, an extension sleeve 400, a sealing member and an elastic member 500. The cavity 100 is a cylindrical tubular structure, mainly for the passage of water flow. The extension sleeve 400 is also a cylindrical tubular structure, and one end of the extension sleeve 400 is connected to the cavity 100 along the axial direction of the extension sleeve 400. The extension sleeve 400 and the cavity 100 form a "T" shaped structure. One end of the limiting sleeve 300 is connected to the extension sleeve 400, so that the limiting sleeve 300, the extension sleeve 400 and the cavity 100 can form a fixed whole. As shown inFigure 3 As shown, the valve core 200 includes a valve core first end 210 and a valve core second end 220, the main structure of the valve core first end 210 and the valve core second end 220 is a cylindrical structure, and the outer diameter size of the valve core first end 210 is larger than that of the valve core second end 220. The valve core first end 210 is arranged inside the cavity 100 through the extension sleeve 400, and the valve core second end is exposed from the extension sleeve 400, that is, arranged outside the cavity 100. As shown in the figure, Figure 2 As shown, the valve core 200 is sleeved with an elastic member 500 on the outside, one end of the elastic member 500 abuts on the cylindrical end face of the valve core first end 210, and the second end of the elastic member 500 abuts on the limiting sleeve 300, thereby providing driving force for the movement of the valve core 200. In this embodiment, the elastic member 500 is specifically a compression spring, and in other embodiments, any elastic element existing in the prior art can also be used. In addition, as shown in the figure, Figure 3 As shown, the cylindrical structure of the valve core first end 210 is provided with a ring-shaped sealing groove 211 on the side surface, and a sealing member is clamped in the ring-shaped sealing groove 211. In the process of moving the valve core 200, the valve core 200 drives the sealing member to move, thereby ensuring that water leakage does not occur at the connection between the valve core 200 and the extension sleeve 400. In this embodiment, the sealing member is specifically an elastic sealing ring, which can be clamped in the ring-shaped sealing groove 211, and in other embodiments, any element that can play a sealing role existing in the prior art can also be used.

[0073] In this embodiment, as shown in the figure, Figure 2 and Figure 3As shown, two clamping portions 230 are also arranged on the side wall of the second end 220 of the valve core, and the two clamping portions 230 are oppositely arranged. The specific structure of the clamping portion 230 is a small cylindrical structure, which extends outward in the radial direction on the side wall of the second end 220 of the valve core. After the limiting sleeve 300 is connected and fixed with the extension sleeve 400, the limiting sleeve 300 can be sleeved on the periphery of the second end 220 of the valve core and fixed relative to the cavity 100. An annular limiting track 330 is formed on the side wall of the limiting sleeve 300 and surrounds the periphery of the valve core 200. The two clamping portions 230 are movably arranged in the annular limiting track 330. The annular limiting track 330 includes a first guide surface and a second guide surface which are oppositely arranged in sequence from the first end 210 to the second end 220 of the valve core. The first guide surface is continuously and alternately provided with a first groove 341 and a second groove 342, and a protrusion 343 is formed between the first groove 341 and the second groove 342. When the clamping portion 230 is clamped at the first groove 341, the limiting sleeve 300 limits the valve core 200 to allow water flow through the cavity 100. When the valve core 200 moves in the direction of the second end 220, the clamping portion 230 jumps over the protrusion 343 under the abutting guidance of the second guide surface. When the valve core 200 further moves in the direction of the first end 210, the clamping portion 230 moves to the second groove 342 under the abutting guidance of the first guide surface, so that the valve core 200 closes the cavity 100.

[0074] Through the above arrangement, when the water heater is in normal use, the two clamping portions 230 are clamped at the first groove 341 of the first guide surface, so that the valve core 200 is limited and does not play a role in blocking the water flow. When the outdoor temperature is low, cold air enters the interior of the water heater along the exhaust pipe, causing the water in the cavity 100 to freeze continuously. After the water freezes, an external force is applied to the first end 210 of the valve core, prompting the valve core 200 to move in the direction of the second end 220. During the movement, the two clamping portions 230 abut on the second guide surface and move under the guidance of the second guide surface to jump over the protrusion 343. When the outdoor temperature rises or the ice melts due to other reasons, the valve core 200 moves in the direction of the first end 210, and the two clamping portions 230 abut on the first guide surface and move to the second groove 342 adjacent to the first groove 341 under the guidance of the first guide surface, so as to drive the valve core 200 to close the cavity 100. At this time, if the pipeline in the water heater has been frozen, the anti-freezing device 1 can prevent water flow into the water heater, thereby avoiding water leakage, causing the floor to be soaked in water, electrical leakage and other property losses and safety problems.

[0075] Further, the first and second guiding surfaces are respectively provided with a first and second protrusion 351 and 352 corresponding to the first and second recesses 341 and 342, and a recess 353 is formed between the first and second protrusions 351 and 352 corresponding to the protrusion 343; when the valve core 200 moves towards its second end, the clamping portion 230 jumps over the protrusion 343 to the recess 353 under the abutting guidance of the second guiding surface; when the valve core 200 moves towards its first end, the clamping portion 230 jumps over the second protrusion 352 to the second recess 342 under the abutting guidance of the first guiding surface. Through this kind of setting, the first and second guiding surfaces basically maintain a parallel state, and the overall width of the annular limiting track 330 does not change greatly, and further, the positions of the recesses and protrusions on the first and second guiding surfaces can be set as needed; when the valve core 200 moves in a specific direction, the clamping portion 230 on the valve core 200 can be guided by the first or second guiding surface to a specific position, thereby meeting specific needs, and the overall structure is simple, and the resetting of the anti-freezing device 1 is simpler, only needs to move the valve core 200 towards the second end 220 of the valve core, and the operation is convenient.

[0076] The structure of the specific limiting sleeve 300 is as follows Figure 4 and Figure 5As shown, in the embodiment, the limiting sleeve 300 comprises a first limiting portion 310 and a second limiting portion 320, the main body structure of the first limiting portion 310 and the second limiting portion 320 is a cylindrical wall structure, and the diameter size of the first limiting portion 310 and the second limiting portion 320 is the same, and the thickness size of the wall is also the same. The first limiting portion 310 extends outward along the radial direction to form a first connecting plate 360 on the end face close to the cavity 100, the first connecting plate 360 is connected with the extension sleeve 400, so that the first limiting portion 310 is relatively fixed with the extension sleeve 400, the end face of the first limiting portion 310 away from the cavity 100 is the first guide surface, the end face of the second limiting portion 320 close to the cavity 100 is the second guide surface, the first guide surface and the second guide surface are oppositely arranged, the gap between the first guide surface and the second guide surface is the annular limiting track 330 of the limiting sleeve 300, and the end face of the second limiting portion 320 away from the cavity 100 is provided with a second connecting plate 370, the peripheral size of the second connecting plate 370 is greater than the diameter size of the second limiting portion 320, and the first connecting plate 360 and the second connecting plate 370 are connected through a connecting column 380, so that the second limiting portion 320 is fixed relative to the first limiting portion 310. Through this kind of setting, the end faces of the first guide surface and the second guide surface are oppositely arranged to form the annular limiting track 330, which is more convenient in processing and manufacturing. In the case that the end faces of the first limiting portion 310 and the second limiting portion 320 cooperate with each other to form the annular limiting track 330, the first connecting plate 360 extending outward along the radial direction of the first limiting portion 310 and the second connecting plate 370 on the second limiting portion 320 are connected through the connecting column 380, so that the first limiting portion 310 and the second limiting portion 320 can be fixed, thereby ensuring that the shape of the annular limiting track 330 will not change. Of course, in other embodiments, the limiting sleeve 300 can also be integrally formed, or separately arranged and then fixed and connected through other means in the prior art.

[0077] When the end faces of the first guide surface and the second guide surface are oppositely arranged to form the annular limiting track 330, the development schematic view of the annular limiting track 330 is as Figure 6As shown, specifically, the first guide surface of the first limiting portion 310 is provided with a first groove 341 and a second groove 342, and a protruding portion 343 is formed between the first groove 341 and the second groove 342; the second guide surface of the second limiting portion 320 is provided with a first protrusion 351 and a second protrusion 352 corresponding to the first groove 341 and the second groove 342, and a groove portion 353 is formed between the first protrusion 351 and the second protrusion 352 corresponding to the protruding portion 343. The opening direction of the first groove 341 and the second groove 342, and the protruding direction of the protruding portion 343 are consistent with the moving direction of the valve core 200 towards the second end thereof, so that the first groove 341 and the second groove 342 hook the clamping portion 230 in the form of a hook, further satisfying the limiting of the valve core 200 by the limiting sleeve 300 or the sealing of the cavity 100 by the valve core 200.

[0078] wherein the direction in Figure 6 is shown, the depth dimension of the first groove 341 is smaller than the depth dimension of the second groove 342, and the protruding dimension of the first protrusion 351 is larger than the protruding dimension of the second protrusion 352. In combination with Figure 2 As shown, when the clamping portion 230 is clamped at the first groove 341, the valve core 200 is limited to move away from the cavity 100 as a whole due to the limiting of the first groove 341, so that the cavity 100 cannot be blocked and the water flow can pass through the cavity 100 normally. When the water in the cavity 100 freezes to exert a force on the first end 210 of the valve core 200, the valve core 200 moves towards the second end 220 thereof, and the clamping portion 230 is moved by the valve core 200 to abut against the second guide surface and move to the groove portion 353 under the guidance of the second guide surface. When the force acting on the first end 210 of the valve core 200 disappears, the valve core 200 moves towards the first end 210 thereof, and the clamping portion 230 is moved by the valve core 200 to abut against the first guide surface and move to the second groove 342 under the guidance of the first guide surface. The clamping portion 230 is limited at the second groove 342, but at this position, the valve core 200 is relatively close to the cavity 100 as a whole, so that the cavity 100 is blocked and the water flow cannot pass through the cavity 100. Moreover, the reset is simpler, which only needs to move the valve core 200 towards the second end 220 thereof, and the operation is convenient.

[0079] In addition, it should be noted that the number of clamping portions 230 on the second end 220 of the valve core in the embodiment is two, and therefore the annular limiting track 330 includes two circulating tracks. As shown in Figure 3 The two clamping portions 230 are arranged at intervals in the circumferential direction of the valve core 200, and the included angle between the two clamping portions 230 is 180 degrees. As shown in Figure 4 Figure 5 and Figure 6 ​As shown, the included angle between the adjacent first groove 341 and the second groove 342 on the first guide surface is 90 degrees, and the included angle between the adjacent first protrusion 351 and the second protrusion 352 on the second guide surface is also 90 degrees. Therefore, the circumferential angle of one cycle track on the circumferential direction of the limiting sleeve 300 is 180 degrees. In this way, during the movement of the valve core 200, the two clamping portions 230 on the valve core 200 can simultaneously move under the abutting guidance of the first guide surface and the second guide surface, and the movement tracks of the two clamping portions 230 are the same, which is more convenient for the two clamping portions 230 to rotate simultaneously during the movement of the valve core 200, thereby meeting the position switching in the corresponding first groove 341 and the second groove 342.

[0080] In the embodiment, the number of clamping portions 230 is two, and in other embodiments, the number of clamping portions 230 can also be other numbers. For example, when the included angle between the adjacent first groove 341 and the second groove 342 on the circumferential direction of the first limiting portion 310 is 60 degrees, the circumferential angle of one cycle track on the circumferential direction of the limiting sleeve 300 is 120 degrees, and at this time, the number of clamping portions 230 can be three, and the included angle of the three clamping portions 230 on the circumferential direction of the valve core 200 is 120 degrees. For another example, when the included angle between the adjacent first groove 341 and the second groove 342 on the circumferential direction of the first limiting portion 310 is 45 degrees, the circumferential angle of one cycle track on the circumferential direction of the limiting sleeve 300 is 90 degrees, and at this time, the number of clamping portions 230 can be four, and the included angle of the four clamping portions 230 on the circumferential direction of the valve core 200 is 90 degrees, or the number of clamping portions 230 is two, and the included angle of the two clamping portions 230 on the circumferential direction of the valve core 200 is 180 degrees. Similarly.

[0081] As described above, in the embodiment, the anti-freezing device 1 comprises the extension sleeve 400 connected to the cavity 100 and extending outward along the radial direction of the cavity 100, the valve core 200 is arranged in the extension sleeve 400 and is movable along the axial direction of the extension sleeve 400, and the limiting sleeve 300 is connected with the extension sleeve 400 and is fixed relative to the cavity 100 through the extension sleeve 400. Specifically, as shown in the figures, Figure 1 and Figure 2As shown, the end face of the extension sleeve 400 outwardly extending relative to the cavity 100 is provided with four threaded holes at the corner of the end face, which are one-to-one corresponding to the four threaded holes on the first connecting plate 360, and are connected by screws, so that the limiting sleeve 300 and the extension sleeve 400 can be fixed. By setting the extension sleeve 400, the movement of the valve core 200 can be along a specific trajectory, preventing the valve core 200 from being separated from the cavity 100 during movement; on the other hand, the extension sleeve 400 can also be connected with the limiting sleeve 300, so that the limiting sleeve 300 can be more conveniently fixed relative to the cavity 100, so that the annular limiting track 330 on the limiting sleeve 300 will not move. Of course, in other embodiments, the extension sleeve 400 can not be provided, and the side wall of the valve core 200 can be directly connected with the cavity 100 and moved relative to the cavity 100, but it should be noted that the valve core 200 should be prevented from being separated from the cavity 100 during movement, and the sealing between the valve core 200 and the cavity 100 should be ensured.

[0082] Further, the inside of the cavity 100 is provided with a first partition plate 110 and a second partition plate 120 along the radial direction thereof, and the first partition plate 110 and the second partition plate 120 form a first flow-through opening and a second flow-through opening, respectively, between the side wall of the cavity 100; the inside of the cavity 100 is provided with a third partition plate 130 along the axial direction thereof, the third partition plate 130 is provided with a third flow-through opening 131, and the third partition plate 130 is connected to the first partition plate 110 and the second partition plate 120, respectively, and the water flow in the cavity 100 flows through the first flow-through opening, the third flow-through opening 131 and the second flow-through opening in sequence.

[0083] Specifically, as shown in FIG. 1, the valve core 200 is provided with a first limiting groove 210 and a second limiting groove 220, which are respectively arranged on the side wall of the valve core 200, and the first limiting groove 210 and the second limiting groove 220 are respectively connected with the first flow-through opening and the second flow-through opening of the cavity 100. Figure 7As shown, the first partition plate 110 and the second partition plate 120 inside the cavity 100 are arranged along the radial direction of the cavity 100, and the parts where the first partition plate 110 and the second partition plate 120 are connected with the cavity 100 are located at opposite positions of the side wall of the cavity 100, the first partition plate 110 and the inner wall of the cavity 100 form a first flow-through opening, the second partition plate 120 and the inner wall of the cavity 100 form a second flow-through opening, and the first flow-through opening and the second flow-through opening are arranged in the interior of the cavity 100 in a staggered manner. The third partition plate 130 connects the first partition plate 110 and the second partition plate 120, and the third partition plate 130 is provided with a third flow-through opening 131, so that in the normal use of the water heater, if the water flow enters from the first flow-through opening, it can only pass through the third flow-through opening and then pass through the second flow-through opening, or if the water flow enters from the second flow-through opening, it can only pass through the third flow-through opening and then pass through the first flow-through opening. Through this arrangement, the water flow inside the cavity 100 passes through the first flow-through opening or the second flow-through opening and then flows out from the third flow-through opening which is arranged in the radial direction of the cavity 100, at this time the valve core 200 only needs to abut against the third flow-through opening to close the cavity 100, which is simple and reliable compared with completely closing the cavity 100, and will not hinder the water flow in the cavity 100 during normal use of the water heater.

[0084] The working process of the anti-freezing device 1 will be introduced as a whole below. Figure 8 、 Figure 9 、 Figure 10 and Figure 11 The working process of the anti-freezing device 1 will be introduced as a whole below.

[0085] Figure 8 and Figure 9 are the overall structure schematic diagrams of the anti-freezing device 1 in the open state, in which state the water flow can pass through the cavity 100 normally, Figure 10 and Figure 11 are the overall structure schematic diagrams of the anti-freezing device 1 in the closed state, in which state the valve core 200 closes the cavity 100 and the water flow cannot pass through the cavity 100, the specific process is as follows.

[0086] As shown in Figure 8 and Figure 9 , in the normal use of the water heater, the two clamping parts 230 on the valve core 200 are clamped at the two first grooves 341 of the first limiting part 310 on the limiting sleeve 300 respectively, the first grooves 341 hook the corresponding clamping parts 230 and overcome the elastic force of the elastic member 500, to avoid the whole valve core 200 moving to the interior of the cavity 100 to close the third flow-through opening 131, at this time the water flow passes through the cavity 100 normally.

[0087] When the outdoor temperature is low, cold air enters the interior of the water heater along the exhaust pipe, causing the water in the cavity 100 to freeze. Because the volume of the water increases when it freezes, an external force is exerted on the first end 210 of the valve core, causing the valve core 200 to move toward the second end 220 of the valve core. In the process of movement, the elastic member 500 is compressed. The two clamping portions 230 on the second end 220 of the valve core first move linearly with the valve core 200 until the two clamping portions 230 abut against the second guide surface at the same time. When the valve core 200 continues to move toward the second end 220 of the valve core, the two clamping portions 230 jump over the protruding portions 343 on the first guide surface under the guidance of the second guide surface and move toward the recessed portions 353 on the second limiting portion 320 until the two clamping portions 230 reach the corresponding recessed portions 353 at the same time, and the water in the cavity 100 completely freezes.

[0088] When the outdoor temperature rises or the ice melts for other reasons, the pressure on the first end 210 of the valve core decreases, and the valve core 200 begins to move toward the first end 210 of the valve core under the elastic force of the elastic member 500. At this time, the two clamping portions 230 on the second end 220 of the valve core first still move linearly with the valve core 200 until the two clamping portions 230 abut against the first guide surface at the same time. When the valve core 200 continues to move toward the first end 210 of the valve core, the two clamping portions 230 jump over the second protrusions 352 of the second limiting portion 320 under the guidance of the first guide surface and move toward the second recesses 342 on the first limiting portion 310 until the two clamping portions 230 reach the corresponding second recesses 342 at the same time, and the first end 210 of the valve core closes the third flow port 131, thereby closing the cavity 100 and blocking the passage of water flow. The specific position is shown in Figure 10 and Figure 11 At this time, if the pipes in the water heater have been frozen and cracked, the anti-freezing device 1 can prevent water from flowing into the water heater, thereby avoiding water leakage, floor water, electrical leakage, and other property losses and safety problems.

[0089] The embodiment also provides a water heater. The anti-freezing device 1 described above is applied to the water heater. The water outlet of the anti-freezing device 1 is connected with the water inlet of the water heater body, which can effectively solve the defect that the water in the pipes in the water heater easily freezes in a cold environment and causes the pipes to crack.

[0090] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example. The protection scope of the present application 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 application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. An anti-icing 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, a clamping portion being arranged on the side wall of the valve core; a limiting sleeve being sleeved on the periphery of the valve core and being fixed relative to the cavity, an annular limiting track being formed on the side wall of the limiting sleeve and surrounding the periphery of the valve core, the clamping portion being movably arranged in the annular limiting track, the annular limiting track comprising a first guide surface and a second guide surface being arranged opposite to each other along the direction from the first end to the second end of the valve core, a first groove and a second groove being alternately arranged on the first guide surface, and a protruding portion being formed between the first groove and the second groove; when the clamping portion is clamped at the first groove, the limiting sleeve limits the valve core to make the water flow pass through the cavity; when the valve core moves towards the second end thereof, the clamping portion jumps over the protruding portion under the abutting guidance of the second guide surface; and when the valve core further moves towards the first end thereof, the clamping portion moves to the second groove under the abutting guidance of the first guide surface, so that the valve core closes the cavity.

2. The freeze protection apparatus of claim 1, wherein a first protrusion and a second protrusion being arranged on the second guide surface corresponding to the first groove and the second groove respectively, and a groove portion being formed between the first protrusion and the second protrusion corresponding to the protruding portion; when the valve core moves towards the second end thereof, the clamping portion jumps over the protruding portion to the groove portion under the abutting guidance of the second guide surface; and when the valve core moves towards the first end thereof, the clamping portion jumps over the second protrusion to the second groove under the abutting guidance of the first guide surface.

3. The freeze protection apparatus of claim 2, wherein, the opening directions of the first groove and the second groove and the protruding direction of the protruding portion are consistent with the moving direction of the valve core towards the second end thereof.

4. The freeze protection apparatus of claim 1, wherein the included angle between the first groove and the second groove adjacent to each other in the circumferential direction of the limiting sleeve is α degrees, wherein α is an integer multiple of 180 degrees; the number of the clamping portions is multiple, the clamping portions are arranged at intervals in the circumferential direction of the valve core, and the included angle between the clamping portions adjacent to each other is β degrees, wherein β is an integer multiple of 360 degrees and is an even multiple of α.

5. The freeze protection apparatus of claim 1, wherein the limiting sleeve comprises a first limiting portion and a second limiting portion connected to each other, the end face of the first limiting portion away from the cavity is the first guide surface, the end face of the second limiting portion close to the cavity is the second guide surface, and the first guide surface and the second guide surface are arranged at intervals to form the annular limiting track.

6. The freeze protection apparatus of claim 5, wherein the side wall of the first limiting portion extends outward in the radial direction to form a first connecting plate, the end face of the second limiting portion 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 limiting portion and the second limiting portion.

7. The freeze protection apparatus of claim 1, wherein The anti-freezing device further comprises an extension sleeve connected to the cavity and extending outward along the radial direction of the cavity, and the first end of the valve core is arranged in the extension sleeve and is movable along the axial direction of the extension sleeve; The limiting sleeve is connected to the extension sleeve and is fixed relative to the cavity through the extension sleeve.

8. The freeze protection apparatus of claim 7, wherein the heating element is a heating cable. The anti-freezing device further comprises a sealing member clamped to the periphery of the first end of the valve core.

9. The freeze protection apparatus of claim 1, wherein The anti-freezing device further comprises an elastic member arranged at the periphery of the valve core, and the two ends of the elastic member abut against the first end of the valve core and the limiting sleeve, respectively.

10. The freeze protection apparatus of claim 1, wherein The interior of the cavity is spaced apart by a first partition plate and a second partition plate along the radial direction thereof, and the first partition plate and the second partition plate form a first flow-through opening and a second flow-through opening, respectively, with the side wall of the cavity; The interior of the cavity is provided with a third partition plate along the axial direction thereof, the third partition plate is connected to the first partition plate and the second partition plate, respectively, and the third partition plate is provided with a third flow-through opening, and water flows through the first flow-through opening, the third flow-through opening and the second flow-through opening in sequence in the cavity.

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

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