Water heater water tank shell structure, water heater water tank and water heater

Abstract

The utility model belongs to the technical field of water supply equipment, and discloses a water heater water tank shell structure, a water heater water tank and a water heater, the shell structure comprises a barrel and an end cover arranged at the end part of the barrel, and the barrel is at least partially overlapped and connected at the edge rolling joint. Namely, the head end and the tail end of the plate are in lap joint and are connected during edge rolling, and compared with the mode that in the prior art, buckling is conducted only through a mutual hook structure, the barrel is firmer and more reliable at the edge rolling connecting position, and expansion after edge rolling is prevented. The end cover comprises a cover plate and an annular plate annularly arranged on the cover plate, the cover plate and / or the annular plate are / is connected with the barrel, the annular plate is attached to the inner circumferential face or the outer circumferential face of the barrel, the annular plate and the barrel are in annular face contact, a concave part does not need to be formed at the end of the barrel in a pre-pressing mode, and the end of the barrel is kept in the original shape. Therefore, the problem that the rolling connection position of the cylinder body is expanded due to pre-pressing forming is solved, it is guaranteed that the follow-up assembling process is smoothly carried out, and the quality of the water tank shell structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water supply equipment, in particular to a water heater water tank shell structure, a water heater water tank and a water heater. Background Art

[0002] Heat pump water heaters, also known as air source heat pump water heaters, heat water by absorbing heat from the air. They can absorb heat energy equivalent to about three times the electricity to heat water while consuming the same amount of electricity. Therefore, they are energy-saving and highly efficient, and are gradually being widely used. Heat pump water heaters usually include a water tank and a refrigeration circuit. The refrigeration circuit includes a compressor, a condenser, a throttling device, and an evaporator connected together. The water tank includes an outer shell and an inner tank disposed in the outer shell. The outer shell plays a role in protecting the internal components, and its stability is extremely important.

[0003] The outer shell includes a cylinder and two end covers (upper end cover and lower end cover) respectively arranged at both ends of the cylinder. In the prior art, the cylinder is made of a metal color plate, the color plate is punched and hook structures that hook each other are made at both ends. After the color plate is rolled, the hook structures on both sides are hooked and buckled to form a cylindrical structure. The upper and lower end covers are interference-fitted with the metal cylinder through a pre-pressed structure. For example, in patent CN211601108U, an inwardly concave U-shaped recessed portion is provided on the outer shell, the U-shaped recessed portion surrounds the outer shell, and is formed by sheet metal stamping or bending. An annular positioning portion is provided on the end cover, and the annular positioning portion is engaged with the U-shaped recessed portion.

[0004] The above scheme has the following defects: since the metal color plate is only fastened by the interlocking structure when it is rolled, it is easy to expand after rolling, and the metal color plate needs to be pre-pressed before being fastened with the end cover to form a U-shaped recessed part. The pressing process easily causes the interlocking structure at the rolled connection to expand, affecting the subsequent assembly process. The matching size of the annular positioning part on the end cover and the U-shaped recessed part on the outer shell needs to be adjusted many times. The window of suitable size for assembly is very small, the tolerance rate is low, and there are production errors, which further increases the difficulty of assembly. In addition, the cylinder and the end cover are both made of metal material. There may be dissatisfaction in foaming between the inner tank and the outer shell during the foaming process. The impact on the water tank during transportation is likely to cause plastic deformation of the cylinder and the end cover, and defects such as pits cannot be restored.

[0005] Therefore, there is an urgent need for a water heater tank shell structure, a water heater tank and a water heater to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a water heater tank shell structure, a water heater tank and a water heater, which can ensure that the rolled connection of the shell cylinder is stable and firm without expansion, ensure the subsequent assembly process goes smoothly, and improve the quality of the water tank shell structure.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] In a first aspect, a water heater tank housing structure is provided, comprising a cylinder and an end cover provided at an end of the cylinder, wherein the cylinder is at least partially overlapped and connected at a rolled connection;

[0009] The end cover comprises a cover plate and an annular plate arranged around the cover plate. The cover plate and / or the annular plate are connected to the cylinder body, and the annular plate is in contact with the inner circumferential surface or the outer circumferential surface of the cylinder body.

[0010] As a preferred solution of the water tank shell of the water heater provided by the utility model, the ring plate is sleeved outside the cylinder, the cover plate is provided with an elastic buckle, the cylinder is provided with a clamping hole, and the elastic buckle is clamped in the clamping hole.

[0011] As a preferred solution of the water tank shell of the water heater provided by the utility model, the elastic buckle includes a cantilever and a hook connected to each other, the end of the cantilever away from the hook is connected to the cover plate, the end of the cylinder is clamped between the cantilever and the ring plate, the hook is clamped in the clamping hole, and the cantilever is used to elastically deform when the hook and the cylinder are slidably engaged.

[0012] As a preferred solution of the water tank shell of the water heater provided by the utility model, a guiding inclined surface is provided on the side of the hook facing the ring plate, and the guiding inclined surface gradually inclines toward the ring plate in a direction approaching the cover plate.

[0013] As a preferred solution of the water tank shell of the water heater provided by the utility model, the cantilever includes a first connecting arm and a second connecting arm arranged at intervals, and the first connecting arm and the second connecting arm are both connected to the hook and the cover plate.

[0014] As a preferred solution of the water tank shell of the water heater provided by the utility model, the first connecting arm and the second connecting arm are both connected with a stiffening rib plate, and the stiffening rib plate is connected to the cover plate.

[0015] As a preferred solution of the water tank shell of the water heater provided by the utility model, the water tank shell structure of the water heater further includes a fastener, and the fastener is penetrated through the curled connection between the ring plate and the cylinder.

[0016] As a preferred solution of the water heater tank shell provided by the utility model, the ring plate is provided with a convex structure protruding outward to form a snap-fit ​​groove on the inner side of the ring plate, the snap-fit ​​groove is snap-fitted with the rolled connection of the cylinder, and the fastener is passed through the convex structure.

[0017] As a preferred solution of the water tank shell of the water heater provided by the utility model, there is one elastic buckle; or, there are multiple elastic buckles distributed around the circumference, and each of the elastic buckles is provided with the clamping hole;

[0018] And / or, the materials of the cylinder and the end cover are both plastic;

[0019] And / or, the overlapping parts of the cylinders are welded.

[0020] In a second aspect, a water heater tank is provided, comprising an inner tank and the water heater tank outer shell structure as described above, wherein the inner tank is arranged in the water heater tank outer shell structure.

[0021] In a third aspect, a water heater is provided, comprising the water heater tank as described above.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a water heater tank shell structure, a water heater tank and a water heater. The cylinder of the shell structure is formed into a cylindrical shape by rolling a plate, which at least partially overlaps and connects together at the rolling connection, that is, the head and tail ends of the plate are overlapped and connected together when rolling. Compared with the prior art that only fastens by means of a mutual hook structure, the cylinder is more secure and reliable at the rolling connection, and prevents expansion after rolling. Moreover, when the end cover is connected to the cylinder, the ring plate of the end cover fits with the inner circumference or outer circumference of the cylinder, and the two are in annular surface contact, so there is no need to pre-press a recessed portion at the end of the cylinder, and the end of the cylinder can maintain its original shape. Therefore, the problem of expansion at the cylinder rolling connection caused by pre-pressing will not occur, ensuring the smooth progress of the subsequent assembly process and improving the quality of the water tank shell structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the water tank shell structure of the water heater provided by the specific embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of a cylinder of a water heater water tank shell structure provided by a specific embodiment of the utility model;

[0026] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 It is a first view of the end cover of the water tank housing structure of the water heater provided by the specific embodiment of the utility model;

[0028] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0029] Figure 6 It is a cross-sectional view of the end cover of the water tank shell structure of the water heater provided by the specific embodiment of the utility model;

[0030] Figure 7 It is a first partial cross-sectional view of the end cover and the cylinder provided in a specific embodiment of the utility model;

[0031] Figure 8 It is a second view of the end cover of the water heater tank housing structure provided by the specific embodiment of the utility model;

[0032] Fig. 9 It is a second partial cross-sectional view of the end cover and the cylinder provided in a specific embodiment of the utility model.

[0033] In the figure:

[0034] 1. Cylinder; 2. End cover;

[0035] 11. Clamping hole; 12. First overlapping portion; 13. Second overlapping portion;

[0036] 121, second connection hole; 131, third connection hole;

[0037] 21. Cover plate; 22. Ring plate; 23. Elastic buckle;

[0038] 211, flat plate; 212, transition plate;

[0039] 221, convex hull structure; 222, engaging groove; 2211, first connecting hole;

[0040] 231, cantilever; 232, hook; 233, stiffening rib plate;

[0041] 2311, first connecting arm; 2312, second connecting arm; 2313, notch; 2314, cutout groove;

[0042] 2321. Guide ramp. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] Embodiment 1

[0048] like Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment provides a water tank shell structure of a water heater, including a cylinder 1 and an end cover 2 arranged at the end of the cylinder 1. Specifically, the upper and lower ends of the cylinder 1 are both open, and an end cover 2 is arranged at each of the two openings, which are an upper end cover and a lower end cover respectively. The water tank shell structure can ensure that the rolled connection of the shell cylinder 1 is stable and firm without expansion, ensure that the subsequent assembly process proceeds smoothly, and improve the quality of the water tank shell structure.

[0049] The cylinder 1 of the outer shell structure is formed into a cylindrical shape by rolling a plate, see Figure 2 and Figure 3 The cylinder 1 is at least partially overlapped and connected together at the rolled connection, that is, the head and tail ends of the plate are overlapped and connected together when rolled. Compared with the prior art in which only the hook structure is used for fastening, the cylinder 1 is more secure and reliable at the rolled connection to prevent expansion after rolling.

[0050] Combination Figure 1 The end cover 2 includes a cover plate 21 and a ring plate 22 arranged around the cover plate 21. The cover plate 21 and / or the ring plate 22 are connected to the cylinder body 1 to achieve the fixation between the end cover 2 and the cylinder body 1. Moreover, when the end cover 2 is connected to the cylinder body 1, the ring plate 22 of the end cover 2 fits with the inner circumferential surface or the outer circumferential surface of the cylinder body 1, and the two are in an annular surface contact. There is no need to pre-press and form a recessed portion at the end of the cylinder body 1. The end of the cylinder body 1 can maintain its original shape. Therefore, there will be no problem of expansion at the curling connection of the cylinder body 1 due to pre-pressing, which ensures that the subsequent assembly process goes smoothly and improves the quality of the water tank shell structure.

[0051] Specifically in this embodiment, the ring plate 22 is sleeved outside the cylinder 1, that is, the upper and lower end covers 2 are both buckled on the ends of the cylinder 1, which makes it easy to ensure the sealing of the connection between the cylinder 1 and the end covers 2. Figure 2 The cylinder 1 is provided with a clamping hole 11, see Figure 4 , the cover plate 21 is provided with an elastic buckle 23, which is clamped in the clamping hole 11 to complete the buckling connection of the end cover 2 at the upper and lower ends of the cylinder 1, that is, in this embodiment, the cover plate 21 is connected to the cylinder 1 through the elastic buckle 23 provided thereon. The elastic buckle 23 can generate elastic deformation when the end cover 2 is buckled on the cylinder 1, and restore the deformation after the clamping hole 11 is completed, which can ensure the stability of the connection between the end cover 2 and the cylinder 1.

[0052] See also Figure 4 , Figure 5 as well as Figure 6 The elastic buckle 23 includes a cantilever 231 and a hook 232 that are connected to each other. The end of the cantilever 231 away from the hook 232 is connected to the cover plate 21, and the hook 232 is used to be clamped in the clamping hole 11. When the end cover 2 is clamped with the cylinder body 1, the elastic buckle 23 is aligned with the clamping hole 11 on the cylinder body 1, and the cylinder wall of the cylinder body 1 enters the gap between the elastic buckle 23 and the ring plate 22. When the hook 232 and the cylinder body 1 are slidably matched, the cantilever 231 is elastically deformed under the squeezing action of the cylinder wall. When the hook 232 moves to a position opposite to the clamping hole 11, the cantilever 231 instantly returns to its original state, so that the hook 232 is clamped into the clamping hole 11, completing the clamping of the end cover 2 and the cylinder body 1. At this time, the end of the cylinder wall of the cylinder body 1 is clamped between the cantilever 231 and the ring plate 22, ensuring that the connection between the end cover 2 and the cylinder body 1 is stable. Figure 7 , which is a schematic diagram of the hook 232 being locked in the locking hole 11 .

[0053] See also Figure 6 and Figure 7A guide slope 2321 is provided on the side of the hook 232 facing the ring plate 22. The guide slope 2321 gradually inclines toward the ring plate 22 in the direction close to the cover plate 21, and is used to guide the cylinder 1 to enter between the elastic buckle 23 and the ring plate 22. Figure 7 In the middle position, the vertical distance between the guide slope 2321 and the ring plate 22 gradually decreases from bottom to top, so that the cylinder 1 can enter between the elastic buckle 23 and the ring plate 22 more easily. After entering, the guide slope 2321 slides with the inner wall of the cylinder 1, and the cantilever 231 is elastically deformed under the squeezing action of the inner wall of the cylinder 1 until the hook 232 is completely inserted into the hook hole 11.

[0054] Furthermore, a side of the hook 232 facing the cover plate 21 is a stop plane, and the inner wall of the hole 11 blocks the stop plane to prevent the elastic buckle 23 from escaping from the hole 11 .

[0055] See also Figure 5 The cantilever 231 includes a first connecting arm 2311 and a second connecting arm 2312 which are arranged at intervals. The first connecting arm 2311 and the second connecting arm 2312 both connect the hook 232 and the cover plate 21. When the hook 232 slides along the inner wall of the cylinder 1, the first connecting arm 2311 and the second connecting arm 2312 are elastically deformed, and a notch 2313 is formed between the first connecting arm 2311 and the second connecting arm 2312. The notch 2313 makes it easier for the cantilever 231 to produce elastic deformation, while ensuring that the strength of the cantilever 231 is sufficient, and at the same time, improves its elastic performance, so that the hook 232 can smoothly complete the engagement with the clamping hole 11. At the same time, the notch 2313 can also reduce the material used for the elastic buckle 23, saving the cost of the shell structure.

[0056] Furthermore, the first connecting arm 2311 and the second connecting arm 2312 are both connected with stiffening ribs 233, and the stiffening ribs 233 are connected to the cover plate 21 to improve the connection strength between the first connecting arm 2311 and the second connecting arm 2312 and the cover plate 21 to avoid breakage between the first connecting arm 2311 and the second connecting arm 2312 and the cover plate 21 when they are deformed.

[0057] Specifically, see Figure 5 and Figure 8 The cover plate 21 includes a flat plate 211 and a transition plate 212 arranged around the flat plate 211. The flat plate 211 is connected to the ring plate 22 through the transition plate 212. Figure 6 The transition plate 212 and the flat plate 211, as well as the transition plate 212 and the ring plate 22 are arranged at an obtuse angle to avoid a large stress concentration on the end plate. That is, the connection between the ring plate 22 and the cover plate 21 is chamfered to form the transition plate 212, which reduces the stress concentration phenomenon and avoids dangerous sharp edges on the end cover 2.

[0058] See also Figure 5 The stiffening rib plate 233 is connected to both the transition plate 212 and the flat plate 211, increasing the connection area with the cover plate 21, and further improving the connection stability between the elastic buckle 23 and the cover plate 21. The first connecting arm 2311 and the second connecting arm 2312 are both connected to the transition plate 212 to avoid an excessively large distance from the ring plate 22.

[0059] Further, see Figure 5 and Fig. 9 The connecting end of the first connecting arm 2311 and the transition plate 212, and the connecting end of the second connecting arm 2312 and the transition plate 212 are both provided with a notch groove 2314, which is used to prevent stress concentration at the junction of the stiffening rib plate 233, the transition plate 212 and the first connecting arm 2311 (the second connecting arm 2312).

[0060] One or more elastic buckles 23 may be provided. In this embodiment, there are multiple elastic buckles 23 distributed around the circumference, and a clamping hole 11 is provided on the cylinder 1 corresponding to each elastic buckle 23. Multiple elastic buckles 23 are engaged with multiple clamping holes 11 in a one-to-one correspondence, ensuring that the end cover 2 is firmly connected to the cylinder 1 and does not fall off. Exemplarily, there are five elastic buckles 23 evenly distributed around the circumference of the cover plate 21, and five clamping holes 11 evenly distributed around the circumference of the cylinder 1, ensuring that the end cover 2 is firmly connected to the cylinder 1, and the forces on the two are balanced after the connection.

[0061] Optionally, the water heater tank shell structure further includes a fastener, which is arranged through the curled connection between the connecting ring plate 22 and the cylinder 1 to further improve the connection strength between the end cover 2 and the cylinder 1. At the same time, since the fastener is arranged through the curled connection, it can further ensure that the overlapping connection position of the cylinder 1 does not expand.

[0062] Specifically, see Figure 4 and Figure 8 The ring plate 22 is provided with a convex structure 221 protruding outwardly, so as to form a snap-fitting groove 222 on the inner side of the ring plate 22, and the snap-fitting groove 222 is snap-fitted with the curled connection of the cylinder body 1, and the fastener is passed through the convex structure 221. Figure 3 and Fig. 9 The overlapping part at the rolled connection of the cylinder 1 is defined as the first overlapping part 12 and the second overlapping part 13. The first overlapping part 12 is overlapped outside the second overlapping part 13, so that the first overlapping part 12 is protruded relative to the outer wall of the cylinder 1. Therefore, by providing a snap-fitting groove 222 on the ring plate 22 to avoid the protruding part, the sealing fit between the ring plate 22 and the cylinder 1 can be ensured. At the same time, the provision of the convex structure 221 on the ring plate 22 can also improve the strength of the ring plate 22 at this position.

[0063] Further, see Fig. 9A first connecting hole 2211 is provided through the ring plate 22 at the convex position, a second connecting hole 121 is provided through the first overlapping portion 12, and a third connecting hole 131 is provided through the second overlapping portion 13. The third connecting hole 131 is a threaded hole, and the fastener is a screw. The screw passes through the first connecting hole 2211 and the second connecting hole 121 in sequence and is screwed into the third connecting hole 131, further connecting and fixing the end cover 2 and the cylinder body 1.

[0064] Furthermore, the apertures of the first connecting hole 2211 and the second connecting hole 121 are both larger than the aperture of the first connecting hole 2211, which can improve the tolerance during assembly, that is, even if the first connecting hole 2211 and the second connecting hole 121 are slightly offset relative to the third connecting hole 131, the fasteners can be threaded.

[0065] In this embodiment, the material of the cylinder 1 and the end cap 2 are both plastic, exemplarily ABS / HIPS / PP / PE / PVC, etc., with a thickness of 1.5mm-3mm, and have high strength, especially higher hardness than thin-walled metal shells. Even if there is a situation where the foaming between the shell and the liner is not full, the cylinder 1 and the end cap 2 made of plastic material will not be dented and deformed due to external impact, ensuring the appearance quality of the shell structure. Moreover, the end cap 2 made of plastic material makes the elastic buckle 23 thereon have a certain strength and elastic deformation ability, and can smoothly complete the engagement with the clamping hole 11.

[0066] In this embodiment, the overlapping parts of the cylinder 1 are welded together, that is, the first overlapping part 12 and the second overlapping part 13 are welded together by a plastic welding process, which can be ultrasonic welding or hot melt welding, to ensure that the connection does not expand.

[0067] The water tank shell structure of the water heater provided in this embodiment is manufactured in the following steps:

[0068] S1. Select a plastic plate that meets the strength design requirements to make the cylinder 1, cut the plastic plate according to the design size and pre-punch it to form the clamping hole 11 for assembling the end cover 2, the connection hole for fasteners, and the holes for assembling other parts such as the inner tank and handle of the water tank;

[0069] S2. After pre-punching, roll the hole and leave a 10mm-25mm overlap at the end of the roll. The overlap is then ultrasonically welded or hot-melt welded.

[0070] S3. The upper and lower end covers 2 are engaged with the reserved holes 11 on the cylinder 1 through a plurality of elastic buckles 23, and then the fasteners (screws) are screwed and fixed.

[0071] In this embodiment, there is no need to pre-press the end of the cylinder 1 and the ring plate 22 of the end cover 2, which will not cause the overlapping joints of the cylinder 1 to swell. Since the end cover 2 is made of plastic, the elastic buckle 23 can be integrally formed on the cover plate 21, which is easy to manufacture and does not require post-processing. When punching the card hole 11, the size of the card hole 11 can be set slightly larger to increase the fault tolerance when assembling with the elastic buckle 23 and reduce the difficulty of production and assembly. This embodiment uses a cylinder 1 and an end cover 2 made of plastic material, which has a higher impact resistance than the existing metal color plate, and the appearance of the water tank is not prone to deformation during transportation.

[0072] This embodiment also provides a water heater tank, including an inner tank and the water heater tank shell structure as described above, wherein the inner tank is disposed in the water heater tank shell structure for storing hot water. This embodiment also provides a water heater including the water heater tank as described above, such as a heat pump water heater. The advantages of the water heater tank and the water heater having the water heater tank shell structure as described above are as described above, and will not be repeated here.

[0073] Embodiment 2

[0074] This embodiment provides a water heater tank shell structure, a water heater tank and a water heater, which differs from the first embodiment in that:

[0075] The cylinder 1 and the ring plate 22 are connected and fixed only by a plurality of locking members, which are distributed in a circumference. The locking members are exemplarily bolts. After the end cover 2 is buckled on the end of the cylinder 1, the plurality of locking members are passed through the ring plate 22 and threadedly connected to the cylinder 1. The provision of the plurality of locking members can also ensure a stable connection between the end cover 2 and the cylinder 1.

[0076] Exemplarily, there are 6 to 12 locking members, which can be set according to needs.

[0077] Embodiment 3

[0078] This embodiment provides a water heater tank shell structure, a water heater tank and a water heater, which differs from the first embodiment in that:

[0079] In this embodiment, the outer circumferential surface of the ring plate 22 is sealed and fitted with the inner circumferential surface of the cylinder 1. For example, the cylinder 1 is provided with a plurality of insertion holes, and the ring plate 22 is provided with a plurality of undercut structures along the circumferential direction, and the plurality of undercut structures are engaged with the plurality of insertion holes one by one to complete the fixation of the end cover 2 and the cylinder 1. When installing the end cover 2, the ring plate 22 is inserted into the cylinder 1, during which the undercut structure is elastically deformed until it is completely inserted into the insertion hole and then restored to its original shape, so that the end cover 2 can be quickly assembled.

[0080] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. The water heater tank shell structure is characterized by: It comprises a cylinder (1) and an end cover (2) arranged at the end of the cylinder (1), wherein the cylinder (1) is at least partially overlapped and connected at a rolled connection; The end cover (2) comprises a cover plate (21) and an annular plate (22) arranged around the cover plate (21); the cover plate (21) and / or the annular plate (22) are connected to the cylinder (1); and the annular plate (22) is in contact with the inner circumferential surface or the outer circumferential surface of the cylinder (1).

2. The water heater tank shell structure according to claim 1, characterized in that: The ring plate (22) is sleeved outside the cylinder (1), an elastic buckle (23) is provided on the cover plate (21), a clamping hole (11) is opened on the cylinder (1), and the elastic buckle (23) is clamped in the clamping hole (11).

3. The water heater tank housing structure according to claim 2, characterized in that: The elastic buckle (23) comprises a cantilever (231) and a hook (232) connected to each other; one end of the cantilever (231) away from the hook (232) is connected to the cover plate (21); the end of the cylinder (1) is clamped between the cantilever (231) and the ring plate (22); the hook (232) is clamped in the clamping hole (11); and the cantilever (231) is used to elastically deform when the hook (232) and the cylinder (1) are slidably matched.

4. The water heater tank housing structure according to claim 3, characterized in that: A guide slope (2321) is provided on one side of the hook (232) facing the ring plate (22), and the guide slope (2321) gradually inclines toward the ring plate (22) in a direction approaching the cover plate (21).

5. The water heater tank housing structure according to claim 3, characterized in that: The cantilever (231) comprises a first connecting arm (2311) and a second connecting arm (2312) which are arranged at intervals, and the first connecting arm (2311) and the second connecting arm (2312) are both connected to the hook (232) and the cover plate (21).

6. The water heater tank housing structure according to claim 5, characterized in that: The first connecting arm (2311) and the second connecting arm (2312) are both connected to a stiffening rib plate (233), and the stiffening rib plate (233) is connected to the cover plate (21).

7. The water heater tank housing structure according to claim 2, characterized in that: The water heater tank shell structure also includes a fastener, which is inserted through a rolled connection between the ring plate (22) and the cylinder (1).

8. The water heater tank housing structure according to claim 7, characterized in that: The ring plate (22) is provided with a convex structure (221) protruding outwardly to form a snap-fit ​​groove (222) on the inner side of the ring plate (22); the snap-fit ​​groove (222) is snap-fitted with the rolled connection of the cylinder (1); and the fastener is passed through the convex structure (221).

9. The water heater tank housing structure according to any one of claims 2 to 8, characterized in that: There is one elastic buckle (23); or, there are a plurality of elastic buckles (23) distributed around the circumference, and each of the elastic buckles (23) is provided with the buckling hole (11); And / or, the materials of the cylinder (1) and the end cover (2) are both plastic; And / or, the overlapping parts of the cylinder (1) are welded together.

10. A water heater tank, characterized in that: It comprises an inner tank and a water heater tank outer shell structure as claimed in any one of claims 1 to 9, wherein the inner tank is arranged in the water heater tank outer shell structure.

11. A water heater, characterized in that Comprising the water heater tank as claimed in claim 10.

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