Water heater

Abstract

The utility model discloses a water heater, which comprises an inner container, an outer container, a water inlet pipe, a water outlet pipe and a water outlet pipe, the shell is arranged on the periphery of the inner container, and a cavity used for being filled with heat preservation materials is formed between the inner container and the shell; the cavity is provided with an injection port for injecting a thermal insulation material into the cavity; the elastic opening and closing piece is arranged at the injection port and can block the injection port; the elastic opening and closing piece can open the injection port under the action of external force; and when the external force is cancelled, the elastic opening and closing piece can reset to block the injection port under the action of the elastic force of the elastic opening and closing piece. According to the invention, the step of injecting the foaming material is simplified, the efficiency of injecting the foaming material is improved, the assembly cost is reduced, and meanwhile, the injection port can be reliably sealed after the foaming material is injected.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a water heater. Background Art

[0002] Water heaters are currently common household appliances, categorized into gas water heaters, electric water heaters, heat pump water heaters, and solar water heaters. Electric water heaters are widely used due to their convenience. Electric water heaters can be further divided into storage-type and instantaneous types. Storage-type electric water heaters, equipped with a water tank, offer advantages such as large water output and stable water temperature, making them popular among many families.

[0003] A typical storage-type electric water heater usually includes a water tank, an electric heating element, and an electronic control board. The water tank can include an outer shell and an inner tank, with the inner tank housed within the outer shell. An insulation layer is installed between the inner tank and the outer shell, and the insulation layer is usually made of foamed material, which is injected through an inlet on the water heater.

[0004] One existing water heater design involves installing a fixture at the filling port after the foaming material has been filled, blocking the port to prevent overflow. The fixture is then removed after the foaming material has cured. This design requires an additional component and involves assembling and removing the fixture. This results in more components, more complex operations, higher overall assembly costs, and lower efficiency. Furthermore, it may lead to the fixture easily falling off or being lost.

[0005] Therefore, it is necessary to propose a water heater that solves at least one of the above problems. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the present invention provides a water heater that simplifies the steps of injecting foaming material, improves the efficiency of injecting foaming material, reduces assembly costs, and ensures that the injection port is reliably sealed after the foaming material is injected.

[0007] The specific technical solution of this utility model embodiment is as follows:

[0008] A water heater includes: an inner tank for containing water; a shell disposed around the inner tank, with a cavity formed between the inner tank and the shell for filling with insulation material; the cavity having an inlet for injecting the insulation material into the cavity; and a resilient opening and closing member disposed at the inlet and capable of sealing the inlet; the resilient opening and closing member can open the inlet under the action of an external force; and when the external force is removed, the resilient opening and closing member can reset and seal the inlet under the action of its own elastic force.

[0009] In a preferred embodiment, the resilient opening and closing element is connected to the housing or the inner liner near the injection port.

[0010] In a preferred embodiment, the housing includes an end cap, and the resilient opening element is attached to the end cap.

[0011] In a preferred embodiment, the elastic opening and closing member is an elastic sheet with a predetermined thickness, the elastic sheet including: a sealing portion for blocking the injection port and a fixing portion for connecting with the housing.

[0012] In a preferred embodiment, the predetermined thickness is between 0.5 mm and 3 mm.

[0013] In a preferred embodiment, the fixing part is detachably connected to the housing.

[0014] In a preferred embodiment, the detachable connection method includes snap-fit, and the housing is provided with a limiting structure that cooperates with the fixing part, the limiting structure and the fixing part cooperating to form a snap-fit ​​mechanism.

[0015] In a preferred embodiment, the limiting structure includes a first engaging portion disposed on the housing, and the fixing portion includes an opening that mates with the first engaging portion.

[0016] In a preferred embodiment, the limiting structure further includes at least one second engaging portion disposed on the housing, and the fixing portion further includes at least one slot that cooperates with at least one second engaging portion.

[0017] In a preferred embodiment, the fixing part is further provided with an extension part, which abuts against the housing.

[0018] In a preferred embodiment, the sealing portion includes a protrusion that extends into the injection port to seal it.

[0019] In a preferred embodiment, an arc-shaped transition portion is provided between the sealing portion and the fixing portion.

[0020] In a preferred embodiment, the sealing portion has a first side close to the fixing portion and a second side away from the fixing portion, and the second side can form a pre-pressure on the housing when the sealing portion blocks the injection port.

[0021] In a preferred embodiment, under the action of an external force, the elastic opening and closing member can open the injection port in a rotating manner. When the elastic opening and closing member opens the injection port under the action of an external force, the second side of the sealing part rotates around the fixing part.

[0022] In a preferred embodiment, the inner liner includes a first inner liner and a second inner liner, the end cap has an injection area for providing the injection port, and the cavity enclosed by the shell, the first inner liner and the second inner liner corresponds to the injection area.

[0023] The technical solution of this utility model has the following significant beneficial effects:

[0024] The water heater provided in this application embodiment features an elastic opening and closing component at the injection port. When foaming agent needs to be injected into the cavity, this component can be opened by an external force, such as a foaming gun, allowing the foaming agent to move into the cavity. After the foaming agent injection is completed, the foaming gun is pulled out, and the elastic opening and closing component can reset under its own elastic force to reseal the injection port. Furthermore, during the process of the foaming agent solidifying into a solid insulation layer, the elastic opening and closing component can reliably seal the injection port. Overall, this application not only simplifies the steps of injecting foaming material, improves the efficiency of foaming material injection, and reduces assembly costs, but also ensures that the injection port is reliably sealed after the foaming material injection is completed. In addition, since the elastic opening and closing component is fixedly connected to the shell, the problem of tooling easily falling off or being lost can be avoided.

[0025] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, embodiments of the present invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0027] Figure 1This is a schematic diagram of the structure of a water heater provided in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of an end cap of a water heater provided in the embodiments of this application;

[0029] Figure 3 for Figure 2 A partially enlarged schematic diagram of end cap A of a water heater is provided in the image;

[0030] Figure 4 This is a first schematic diagram of a resilient opening and closing member provided in the embodiments of this application;

[0031] Figure 5 This is a second schematic diagram of a flexible opening and closing component provided in the embodiments of this application;

[0032] Figure 6 This is a schematic diagram of the first state of a water heater before foaming, as provided in the embodiments of this application.

[0033] Figure 7 This is a schematic diagram of the second state of a water heater during foaming, as provided in the embodiments of this application.

[0034] Figure 8 This is a schematic diagram of the third state of a water heater after foaming, as provided in the embodiments of this application.

[0035] Figure 9 This is a schematic diagram of an elastic opening and closing member in its natural state, as provided in the embodiments of this application.

[0036] Reference numerals in the figures of this application:

[0037] 1. Shell;

[0038] 10. End caps;

[0039] 11. First connecting part;

[0040] 12. Second locking part;

[0041] 100. Injection port;

[0042] 101. Injection area;

[0043] 2. Flexible opening and closing mechanism;

[0044] 21. Sealing part;

[0045] 210. Protrusion;

[0046] 211. First side;

[0047] 212. The second side;

[0048] 22. Fixing part;

[0049] 220. Opening;

[0050] 23. Extension section;

[0051] 24. Transition section;

[0052] 31. First inner liner;

[0053] 32. Second inner liner;

[0054] 4. Foam gun. DETAILED DESCRIPTION

[0055] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0056] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] This utility model provides a water heater that simplifies the steps of injecting foaming material, improves the efficiency of foaming material injection, and reduces assembly costs by setting an elastic opening and closing component at the injection port. At the same time, it can also ensure that the injection port is reliably sealed after the foaming material injection is completed.

[0059] Please refer to the following for comprehensive information. Figures 1 to 5This application specification provides a water heater, which may include: an inner tank for containing water; a shell 1 disposed around the inner tank, with a cavity formed between the inner tank and the shell 1 for filling with insulation material; the cavity having an inlet 100 for injecting insulation material into the cavity; and an elastic opening and closing member 2 disposed at the inlet 100 and capable of sealing the inlet 100; the elastic opening and closing member 2 can open the inlet 100 under external force; and when the external force is removed, the elastic opening and closing member 2 can reset and seal the inlet 100 under its own elastic force.

[0060] In the embodiments of this application, the water heater can be a storage-type water heater, which can be an electric water heater or other types of water heaters. This application does not specifically limit the type of water heater described herein. In the embodiments of this application, the storage-type water heater is mainly illustrated using an electric water heater as an example.

[0061] The water heater may include an inner tank for holding water and a shell 1 fitted over the inner tank. Furthermore, different heating units may be included depending on the type of water heater. For example, when the water heater is an electric water heater, it may also include an electric heating element.

[0062] The number of inner linings can be one or two, such as... Figure 1 As shown, the water heater may include two inner tanks, namely a first inner tank 31 and a second inner tank 32. Of course, it is also possible that there are more than two inner tanks.

[0063] A hollow cavity is formed between the inner liner and the outer shell 1. Generally, to keep the heated water in the inner liner warm, an insulating material is filled into the cavity. Specifically, this insulating material can be formed by injecting a foaming agent into the cavity. The composition of this foaming agent is not specifically limited herein. Generally, the foaming agent has the following characteristics: it has a certain fluidity during the injection phase and automatically solidifies into a solid insulating layer after a period of time following injection.

[0064] like Figure 1 As shown, an injection port 100 is provided on the cavity, through which a foaming agent can be injected into the cavity. In this embodiment, an elastic opening and closing member 2 is also fixedly connected to the cavity near the injection port 100. The elastic opening and closing member 2 can open the injection port 100 under the action of external force; when the external force is removed, the elastic opening and closing member 2 can reset and seal the injection port 100 under the action of its own elastic force.

[0065] In this embodiment, by providing the elastic opening and closing member 2 at the injection port 100, when foaming agent needs to be injected into the cavity, the elastic opening and closing member 2 can be opened by an external force, such as the foaming gun 4, so that the foaming agent moves into the cavity; after the foaming agent injection is completed, the foaming gun 4 is pulled out, and the elastic opening and closing member 2 can reset under its own elastic force to reseal the injection port 100. Furthermore, during the process of the foaming agent solidifying into a solid insulation layer, the elastic opening and closing member 2 can reliably seal the injection port 100. Overall, this application not only simplifies the steps of injecting foaming material, improves the efficiency of foaming material injection, and reduces assembly costs, but also ensures that the injection port 100 is reliably sealed after the foaming material injection is completed. In addition, since the elastic opening and closing member 2 is fixedly connected to the housing 1, the problem of tooling easily falling off or being lost can be avoided.

[0066] In some embodiments, considering that the inner liner requires a high degree of sealing and needs to withstand a certain pressure during use, the injection port 100 can be located on the shell 1, where the sealing requirement is relatively low and no pressure is required during use. Correspondingly, the elastic opening / closing member 2 is connected to the shell 1 near the injection port 100. Of course, in some embodiments, the elastic opening / closing member 2 can also be located on the inner liner, near the injection port 100.

[0067] Furthermore, the housing 1 generally includes side walls and end caps 10. An additional protective cover is added to the outside of the end caps 10, which serves two purposes: firstly, to ensure the overall aesthetics of the housing 1, and secondly, to seal and protect the structures on the end caps 10, achieving waterproofing and dustproofing.

[0068] In a preferred embodiment of this application, the injection port 100 can be provided on the end cap 10. Correspondingly, the elastic opening and closing member 2 is connected to the end cap 10. On the one hand, this can ensure the overall aesthetics of the housing 1, and on the other hand, the cover can be used to protect the elastic opening and closing member 2.

[0069] Under the action of external force, the elastic opening and closing member 2 can rotate a certain angle into the cavity in the first direction. When the external force is removed, the elastic opening and closing member 2 rotates in the opposite direction to the first direction to reset.

[0070] Please refer to Figure 6 , Figure 7 and Figure 8 When it is necessary to inject foaming agent into this cavity, such as Figure 6 As shown, firstly, the foam gun 4 can be aligned directly with the injection port 100; as... Figure 7As shown, the foam gun 4 is then moved downwards. Since the foam gun 4 contacts the elastic opening / closing member 2, a rotational force is applied to the elastic opening / closing member 2. At this time, the elastic opening / closing member 2 is pushed open by the foam gun 4 and rotated a certain angle into the cavity. Then, the foam gun 4 is activated to inject foaming agent into the cavity. After the foaming agent has finished, as... Figure 8 As shown, the foam gun 4 can be turned off and moved upward until it is disengaged from the elastic opening and closing member 2. When this happens, the external force applied to the elastic opening and closing member 2 is canceled, and the elastic opening and closing member 2 can automatically reset under its own elastic force, thereby reliably sealing the injection port 100.

[0071] In addition, after the foaming agent is injected, during the process of solidifying into an insulation layer, some of the foaming agent may come into contact with the elastic opening and closing member 2. The foaming agent in contact with the elastic opening and closing member 2 will exert a force on the elastic opening and closing member 2, making it better abut against the injection port 100. This can further ensure that the elastic opening and closing member 2 reliably seals the injection port 100 after the foaming agent is injected, preventing the foaming agent from overflowing.

[0072] In some embodiments, the elastic opening and closing member 2 is an elastic sheet with a predetermined thickness, the elastic sheet including: a sealing part 21 for blocking the injection port 100 and a fixing part 22 for connecting with the housing 1.

[0073] The elastic opening / closing element 2 can be an elastic sheet with a certain thickness, specifically between 0.5 mm and 3 mm. Generally, when the thickness of the elastic opening / closing element 2 is less than 0.5 mm, its strength and reliability may be relatively low; when the thickness of the elastic opening / closing element 2 is greater than 3 mm, its elastic force may be relatively poor. Therefore, the thickness of the elastic opening / closing element 2 is selected within the above-mentioned size range. Of course, the specific thickness of the elastic opening / closing element 2 can be determined comprehensively by considering its material, shape, and structure.

[0074] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The resilient opening / closing member 2 may include a fixing part 22 for connecting with the housing 1. Specifically, the fixing part 22 can be detachably connected to the housing 1.

[0075] The detachable connection method may include snap-fit. The housing 1 is provided with a limiting structure that cooperates with the fixing part 22, and the limiting structure and the fixing part 22 cooperate to form a snap-fit ​​mechanism. Specifically, this snap-fit ​​structure may be a combination of an opening 220 and / or a slot and a protrusion.

[0076] For example, the limiting structure may include a first engaging portion 11 disposed on the housing 1, and the fixing portion 22 may include an opening 220 that cooperates with the first engaging portion 11.

[0077] The first engaging part 11 can be a protrusion provided on the end cap 10 of the housing 1. The fixing part 22 can be in the shape of a thin plate. The fixing part 22 can be fitted to the end cap 10. The fixing part 22 is provided with an opening 220. The protrusion can be engaged in the opening 220, thereby realizing the positioning of the elastic opening and closing member 2 and the end cap 10. At the same time, it ensures that the elastic opening and closing member 2 can rotate under the action of external force.

[0078] The protrusion and the opening 220 can be one, two, or even more.

[0079] like Figure 3 As shown, in one specific embodiment, the limiting structure may further include at least one second engaging portion 12 disposed on the housing 1, and the fixing portion 22 may further include at least one slot that cooperates with at least one second engaging portion 12.

[0080] In this embodiment, the limiting structure may further include at least one second engaging portion 12. For example... Figure 3 As shown, the second engaging portion 12 can be a plurality of locking plates formed along the side edge of the end cover 10, and the plurality of locking plates can be spaced apart along the side edge of the end cover 10. Correspondingly, the fixing portion 22 can also be provided with slots that cooperate with the second engaging portion 12. The specific number and position of the slots can be matched with the position and number of the locking plates. This limiting structure, through the cooperation of the second engaging portion and the slots, can improve the reliability and stability of the elastic engaging member 2 installed on the end cover 10.

[0081] Furthermore, the detachable connection between the fixing part 22 and the end cap 10 can also include a threaded connection. When the detachable connection is a threaded connection, the fixing part 22 can be connected to the end cap 10 by screws.

[0082] Of course, the specific configuration of the detachable connection can also be in other ways, and is not limited to the above description. Those skilled in the art may make other changes under the guidance of the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the scope of protection of this application.

[0083] In one embodiment, the fixing part 22 is further provided with an extension part 23, which abuts against the housing 1.

[0084] In this embodiment, the fixing part 22 may also have an extension part 23, which may specifically be a bent plate formed on the side of the fixing part 22 away from the sealing part 21. The extension part 23 and the fixing part 22 can fit into the step formed on the end cover 10. When the elastic opening and closing member 2 is subjected to external force, the extension part 23 can reliably abut against the end cover 10, and at the same time provide an auxiliary restoring force to the elastic opening and closing member 2.

[0085] In this embodiment, the resilient opening / closing member 2 includes a sealing portion 21 for sealing the injection port 100. Specifically, the sealing portion 21 may include a protrusion 210 that can extend into the injection port 100 to seal it. The protrusion 210 may be a protrusion formed in the middle of the sealing portion 21. The protrusion can extend into the injection port 100, and the edge of the protrusion is used to seal with the end cap 10 at the injection port 100. When the sealing portion 21 is provided with a protrusion 210 that can extend into the injection port 100, the protrusion 210 can more reliably seal the injection port 100. In addition, the protrusion 210 can also serve as a buffer portion of the resilient opening / closing member 2. After the foaming agent is injected, during the process of the foaming agent solidifying into an insulation layer, the force generated by the foaming agent may be applied to the resilient opening / closing member 2. By providing the protrusion 210 at the sealing part 21, this application not only improves the overall reliability of the sealing part 21 and makes it less prone to deformation compared to a planar structure, but also increases the sealing area between the sealing part 21 and the injection port 100. In addition, the force generated by the foaming agent can be used to make the sealing part 21 reliably abut against the injection port 100, achieving an ideal sealing effect.

[0086] Please see Figure 4 or Figure 5 In one embodiment, an arc-shaped transition portion 24 is provided between the sealing portion 21 and the fixing portion 22.

[0087] In this embodiment, a transition portion 24 is provided between the sealing portion 21 and the fixing portion 22. The transition portion 24 can be a curved structure in the shape of an arc. The curved structure can make the elastic opening and closing member 2 less prone to fatigue damage at the transition position during the rotation of the sealing portion 21 around the fixing portion 22. That is, it is used to ensure the reliability of the elastic opening and closing member 2 at the transition position, thereby extending the service life of the entire elastic opening and closing member 2.

[0088] like Figure 4 As shown, in one embodiment, the sealing portion 21 has a first side 211 near the fixing portion 22 and a second side 212 away from the fixing portion 22. When the sealing portion 21 blocks the injection port 100, the second side 212 can form a pre-pressure on the housing 1.

[0089] In this embodiment, the sealing part 21 has a first side 211 that is relatively close to the fixing part 22 and a second side 212 that is far away from the fixing part 22. In order to ensure that the sealing part 21 can reliably seal the injection port 100 after the foam gun 4 is pulled out, at least a certain pre-pressure can be formed between the second side 212 and the end cap 10.

[0090] Specifically, in order to ensure that a certain pre-pressure is formed between the second side 212 of the sealing part 21 and the end cap 10, one way to form the pre-pressure is to have the sealing part 21 inclined from the first side 211 to the second side 212.

[0091] like Figure 9 As shown, when the elastic opening and closing member 2 is in its natural state, that is, before the elastic opening and closing member 2 is assembled with the injection port 100, the horizontal plane B parallel to the mounting plane of the injection port 100 is used as a reference. The position of the second side 212 is higher than the position of the first side 211. That is, the sealing part 21 can tilt upward from the first side 211 to the second side 212. So that when the elastic opening and closing member 2 is engaged with the injection port 100, and both the second side 212 and the first side 211 are in contact with the mounting plane of the injection port 100, a pre-pressure is formed at the second side 212.

[0092] The elastic opening and closing member 2 can open the injection port 100 by rotation under the action of external force. When the elastic opening and closing member 2 opens the injection port 100 under the action of external force, the second side 212 of the sealing part 21 rotates around the fixing part 22.

[0093] Under the action of external force, after the elastic opening and closing member 2 opens the injection port 100, the distance between the second side 212 and the injection port 100 is greater than the distance between the first side 211 and the injection port 100.

[0094] When the elastic opening and closing member 2 is opened under the action of external force, the sealing part 21 rotates around the fixing part 22. The distance between the second side 212 and the end cover 10 (injection port 100) is greater than the distance between the first side 211 and the end cover 10 (injection port 100), so that the elastic opening and closing member 2 accumulates elastic potential energy so that it can automatically reset after the external force is removed.

[0095] Of course, there are other ways to form a certain pre-pressure between the second side 212 of the sealing part 21 and the end cover 10, and it is not limited to the above description. Those skilled in the art may make other changes under the guidance of the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the scope of protection of this application.

[0096] like Figure 1 As shown, in one embodiment, the inner liner may include a first inner liner 31 and a second inner liner 32, the end cap 10 has an injection area 101 for setting the injection port 100, and the cavity enclosed by the shell 1, the first inner liner 31 and the second inner liner 32 corresponds to the injection area 101.

[0097] In this embodiment, the water heater may include a first inner tank 31 and a second inner tank 32. A large cavity gap is formed between the first inner tank 31 and the second inner tank 32 and the shell 1, and this cavity gap corresponds to the end cap 10. That is, the portion of the end cap 10 corresponding to the cavity gap can form a relatively large area. In this embodiment, this area can be used to form an injection area 101, and the injection port 100 can be located in the injection area 101, making the overall structure of the water heater compact and the component layout reasonable. It also facilitates operations such as injecting foaming agent.

[0098] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0099] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0100] The above are merely a few embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in this utility model. However, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. A water heater, characterized in that: The water heater comprises: An inner liner, wherein the inner liner is used to contain water; A shell, the shell being arranged on the periphery of the inner liner, and a cavity for filling with a heat-insulating material is formed between the inner liner and the shell; the cavity has an injection port for injecting the heat-insulating material into the cavity; An elastic opening and closing member, which is arranged at the injection port and can block the injection port; The elastic opening and closing member can open the injection port under the action of an external force; when the external force is removed, the elastic opening and closing member can return to its original position and block the injection port under the action of its own elastic force.

2. The water heater according to claim 1, characterized in that: The elastic opening and closing piece is connected to the shell body or the inner container near the injection port.

3. The water heater according to claim 2, characterized in that: The shell comprises an end cover, and the elastic opening and closing member is connected to the end cover.

4. The water heater according to claim 2, characterized in that: The elastic opening and closing member is an elastic sheet with a predetermined thickness, and the elastic sheet includes a sealing portion for blocking the injection port and a fixing portion for connecting with the shell.

5. The water heater according to claim 4, characterized in that The predetermined thickness is between 0.5 mm and 3 mm.

6. The water heater according to claim 4, characterized in that: The fixing portion is matched with the housing in a detachable connection manner.

7. The water heater according to claim 6, characterized in that The detachable connection method includes snap connection. The housing is provided with a limiting structure that cooperates with the fixing part. The limiting structure cooperates with the fixing part to form a snap connection mechanism.

8. The water heater according to claim 7, characterized in that The limiting structure includes a first engaging portion arranged on the housing, and the fixing portion includes an opening matched with the first engaging portion.

9. The water heater according to claim 8, characterized in that The limiting structure further includes at least one second engaging portion arranged on the housing, and the fixing portion further includes at least one slot matched with at least one second engaging portion.

10. The water heater according to claim 4, characterized in that The fixing portion is also provided with an extending portion, and the extending portion is in contact with the shell.

11. The water heater according to claim 4, characterized in that The sealing portion includes a protrusion that can extend into the injection port to seal the injection port.

12. The water heater according to claim 4, characterized in that An arc-shaped transition portion is provided between the sealing portion and the fixing portion.

13. The water heater according to claim 12, characterized in that The sealing portion has a first side close to the fixing portion and a second side away from the fixing portion. When the sealing portion blocks the injection port, the second side can form a pre-pressure on the shell.

14. The water heater according to claim 13, characterized in that The elastic opening and closing member can open the injection port in a rotational manner under the action of an external force. When the elastic opening and closing member opens the injection port under the action of an external force, the second side of the sealing portion rotates around the fixing portion.

15. The water heater according to claim 3, characterized in that The inner liner includes a first inner liner and a second inner liner, the end cover has an injection area for setting the injection port, and the cavity surrounded by the shell, the first inner liner and the second inner liner corresponds to the injection area.

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