Double inner container water heater

Abstract

The utility model relates to domestic appliance technical field discloses a double inner container water heater. The double inner container water heater includes shell, end cover and two inner containers, is provided with the accommodation space in the shell, and the end of shell is provided with the end opening that is linked with the accommodation space, two inner containers are side by side arrangement, and all are accommodated in the accommodation space, at least part of the outer edge of end cover is linear segment, the shape of end opening is compatible with the shape of end cover, the position of each inner container on end cover is provided with the installation port and the deformation avoidance space that is linked with the installation port, and end cover is capped in end opening, and the bung of each inner container is installed in the corresponding installation port. The double inner container water heater can avoid the situation that end cover appears in the injection moulding production process, guarantees the finished product quality of end cover, and can guarantee the assembly effect and assembly efficiency between end cover and inner container and between end cover and shell.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a double-tank water heater. Background Technology

[0002] As people's living standards improve, electric water heaters have become the first choice for countless households due to their advantages such as not requiring separate installation in each room, not producing harmful gases, quick and convenient temperature adjustment, and safety and reliability. Dual-tank electric water heaters, as one common type, are favored by an increasing number of users because of their rapid heating and variable capacity functions.

[0003] Dual-tank water heaters typically consist of an outer shell, end caps, and two inner tanks. The two inner tanks are arranged side-by-side and housed within the outer shell. The end caps seal the end openings of the outer shell and have corresponding mounting holes for each inner tank. However, during the foaming and assembly process, the two inner tanks can easily shift away from each other, affecting the assembly effect between the end caps and the inner tanks, and consequently impacting the safety and stability of the entire unit. Furthermore, in related technologies, the end openings of the outer shell are usually elliptical, and the outer contour of the end caps is adapted to the shape of the end openings. Elliptical end caps are prone to becoming out of round during injection molding, affecting not only the finished quality of the end caps but also increasing the difficulty of assembling them with the outer shell, and ultimately impacting the overall assembly efficiency.

[0004] Therefore, there is an urgent need to develop a dual-tank water heater to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a double-tank water heater that can prevent the end cap from becoming out of round during the injection molding process, ensuring the quality of the finished end cap, and at the same time ensuring the assembly effect and efficiency between the end cap and the inner tank and between the end cap and the outer shell.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dual-tank water heater, comprising:

[0008] The outer casing has an accommodating space inside, and an end opening at one end of the outer casing is connected to the accommodating space. The end opening is polygonal in shape.

[0009] Two inner liner are arranged side by side and both are housed within the accommodating space;

[0010] An end cap, at least a portion of the outer edge of the end cap is a straight segment, the shape of the end opening is adapted to the shape of the end cap, the end cap is provided with an installation port and a deformation clearance space connected to the installation port for each of the inner liner positions, the end cap covers the end opening, and the liner opening of each of the inner liners is installed in the corresponding installation port.

[0011] As a preferred embodiment of the dual-tank water heater provided by this utility model, the two deformation avoidance spaces are respectively located on the side of the corresponding installation port away from the central axis of the end cover.

[0012] As a preferred embodiment of the dual-tank water heater provided by this utility model, the two inner tanks are respectively a first inner tank and a second inner tank, and the two mounting ports are respectively a first mounting port corresponding to the first inner tank and a second mounting port corresponding to the second inner tank.

[0013] The first inner liner is provided with a first interface and a second interface. The first interface is used to install a temperature detection device, and the second interface is used to install a magnesium rod. The first interface passes through the deformation clearance space corresponding to the first installation port. The end cap is also provided with a through hole for the second interface to pass through.

[0014] As a preferred embodiment of the dual-tank water heater provided by this utility model, a sponge strip is attached to the connection between the first inner tank and the first interface.

[0015] And / or, a sponge strip is affixed to the connection between the first inner liner and the second interface portion;

[0016] And / or, a sponge strip is attached to the opening of each of the two inner liner.

[0017] As a preferred embodiment of the dual-tank water heater provided by this utility model, the circumferential side of the deformation avoidance space corresponding to the first installation port extends towards the first inner tank to form a first extension rib.

[0018] And / or, the circumferential side of the through hole extends toward the first inner liner to form a second extension rib.

[0019] As a preferred embodiment of the dual-tank water heater provided by this utility model, the end cap is provided with a filling port.

[0020] As a preferred embodiment of the dual-tank water heater provided by this utility model, the outer edge of the end cap includes several straight segments and several arc segments, which are alternately arranged and connected end to end in sequence.

[0021] As a preferred embodiment of the dual-tank water heater provided by this utility model, an electrical compartment is provided on the side of the end cover away from the inner tank, and the electrical compartment is used to install the power board and the thermostat.

[0022] The dual-tank water heater also includes a maintenance cover that is detachably sealed to the maintenance opening of the electrical compartment.

[0023] As a preferred embodiment of the dual-tank water heater provided by this utility model, a limiting groove is provided on the end cover, and a second annular rib is formed by extending the outer periphery of the maintenance cover along its axial direction. The second annular rib is inserted into the limiting groove.

[0024] As a preferred embodiment of the dual-tank water heater provided by this utility model, the electrical compartment is provided with a first mounting groove extending along the axial direction of the mounting port, and the first mounting groove is used to install the power board;

[0025] And / or, the appliance compartment is provided with a second mounting slot, the second mounting slot being used to install the thermostat;

[0026] And / or, the electrical appliance compartment is provided with a wire clamping structure, which is used to fix the power cord;

[0027] And / or, the appliance compartment is provided with a cable management channel for cable harnesses.

[0028] As a preferred embodiment of the dual-tank water heater provided by this utility model, the end cap is further provided with a reinforcing structure on the side near the inner tank, and the reinforcing structure is located between the two mounting ports.

[0029] The beneficial effects of this utility model are as follows:

[0030] The dual-tank water heater provided by this utility model sets at least a portion of the outer edge of the end cap as a straight segment. This straight segment can restrain the rest of the end cap, making it less likely for the end cap to become out of round during injection molding. This not only ensures the quality of the finished end cap but also avoids increased assembly difficulty between the end cap and the outer shell due to out-of-roundness, thereby improving the assembly efficiency between the end cap and the outer shell. By providing deformation avoidance space on the end cap, sufficient space can be provided for the offset of the inner tank during the foaming assembly process of the whole machine, so as to ensure the assembly effect between the end cap and the inner tank, thereby ensuring the safety and stability of the whole machine. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a dual-tank water heater provided in this embodiment of the utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the outer shell provided in an embodiment of the present utility model;

[0034] Figure 3 This is a schematic diagram of the inner liner provided in an embodiment of the present utility model;

[0035] Figure 4 This is one of the structural schematic diagrams of the end cap provided in this embodiment of the utility model;

[0036] Figure 5 This is the second schematic diagram of the end cap structure provided in this embodiment of the utility model;

[0037] Figure 6 This is the third schematic diagram of the end cap structure provided in this embodiment of the utility model;

[0038] Figure 7 This is a schematic diagram of the structure of the maintenance cover provided in an embodiment of this utility model;

[0039] Figure 8 yes Figure 5 A partial structural diagram.

[0040] Figure label:

[0041] 10. Outer shell; 101. Accommodating space; 102. End opening;

[0042] 20. Inner liner; 21. First inner liner; 211. First interface; 212. Second interface; 22. Second inner liner;

[0043] 30. End cap; 3001. Straight section; 3002. Curved section; 301. Mounting port; 3011. First mounting port; 3012. Second mounting port; 302. Deformation clearance space; 3021. First extension rib; 303. Connecting rib; 304. Through hole; 3041. Second extension rib; 306. Electrical compartment; 3060. Maintenance opening; 3061. First mounting groove; 3062. Second mounting groove; 3063. Cable management groove; 3064. Cable pressing structure; 3065. Limiting post; 3066. First annular rib; 3067. Snap-fit ​​component; 307. Limiting groove; 308. Injection port; 309. Snap-fit ​​hole;

[0044] 40. Maintenance cover; 401. Second annular rib; 4011. Clearance groove; 402. Clip;

[0045] 50. Strengthen the structure; 51. Horizontal reinforcement; 52. Vertical reinforcement. Detailed Implementation

[0046] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0047] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0048] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0049] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0050] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0051] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0052] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0053] Figure 1 A schematic diagram of the structure of the dual-tank water heater provided in this embodiment is shown. Figure 2 A schematic diagram of the structure of the housing 10 provided in this embodiment is shown. Figure 3 A schematic diagram of the structure of the inner liner 20 provided in this embodiment is shown. Figure 4 One of the structural schematic diagrams of the end cap 30 provided in this embodiment is shown. For example... Figures 1-4As shown, this embodiment provides a dual-tank water heater, which includes an outer shell 10, an end cap 30, and two inner tanks 20. The outer shell 10 has a receiving space 101, and the end of the outer shell 10 has an end opening 102 that communicates with the receiving space 101. The two inner tanks 20 are arranged side by side and are both received in the receiving space 101. At least a portion of the outer edge of the end cap 30 is a straight segment 3001. The shape of the end opening 102 is adapted to the shape of the end cap 30. The end cap 30 has an installation port 301 and a deformation clearance space 302 that communicates with the installation port 301 at the position corresponding to each inner tank 20. The end cap 30 covers the end opening 102, and the inlet of each inner tank 20 is installed in the corresponding installation port 301.

[0054] The dual-tank water heater provided in this embodiment sets at least a portion of the outer edge of the end cap 30 as a straight segment 3001. The straight segment 3001 can restrain the rest of the end cap 30, making it less likely for the end cap 30 to become out of round during injection molding. This not only ensures the finished quality of the end cap 30, but also avoids the increased assembly difficulty between the end cap 30 and the outer shell 10 due to out-of-roundness, thereby improving the assembly efficiency between the end cap 30 and the outer shell 10. By providing a deformation avoidance space 302 on the end cap 30, sufficient space can be provided for the offset of the inner tank 20 during the foaming assembly process of the whole machine, so as to ensure the assembly effect of the end cap 30 and the inner tank 20, thereby ensuring the safety and stability of the whole machine.

[0055] like Figure 2 and Figure 4 As shown, the outer edge of the end cap 30 includes several straight segments 3001 and several curved segments 3002, which are alternately arranged and connected end-to-end in sequence. The straight segments 3001 can restrain the curved segments 3002 at both ends, preventing deformation of the curved segments 3002; the curved segments 3002 connect two straight segments 3001, preventing sharp corners at the connection point and thus stress concentration. In this embodiment, there are eight straight segments 3001 and eight curved segments 3002, which are connected sequentially to form an approximately octagonal end cap 30. Of course, this embodiment does not limit the number of straight segments 3001 or curved segments 3002 on the end cap 30; designers can make adaptive adjustments according to actual product and assembly requirements. For example, the number of straight line segments 3001 and the number of arc segments 3002 can both be four, six, ten, etc., to be connected in sequence to form an end cap that is approximately rectangular, hexagonal, or decagonal, etc.

[0056] like Figure 4As shown, in this embodiment, the two deformation avoidance spaces 302 are respectively located on the side of the corresponding mounting port 301 away from the central axis of the end cap 30. During the foaming assembly process, the two inner liner 20 will shift away from each other. Through the above setting, the deformation avoidance space 302 can provide sufficient space for the inner liner 20 to shift under the action of foaming force, thereby avoiding damage to the end cap 30 by the inner liner 20, and ensuring the finished quality of the end cap 30.

[0057] like Figure 3 and Figure 4 As shown, for ease of understanding, Figure 3 The inner liner 20 located at the top is designated as the first inner liner 21. Figure 3 The inner liner 20 located at the bottom is designated as the second inner liner 22; the mounting port 301 corresponding to the first inner liner 21 is designated as the first mounting port 3011. Figure 4 The mounting port 301 located on the right side is designated as the second mounting port 3012, corresponding to the second inner liner 22. Figure 4 The mounting port 301 is located on the left side. Optionally, the first inner liner 21 is provided with a first interface portion 211 and a second interface portion 212. The first interface portion 211 is used to install a temperature sensing element, and the second interface portion 212 is used to install a magnesium rod. The first interface portion 211 passes through the deformation clearance space 302 corresponding to the first mounting port 3011. The end cap 30 is also provided with a through hole 304 for the second interface portion 212 to pass through. That is to say, the deformation clearance space 302 corresponding to the first mounting port 3011 not only provides offset space for the first inner liner 21 to shift during the foaming process, but also provides clearance for the setting of the first interface portion 211. This design can simplify the structure of the end cap 30 and improve the processing efficiency of the end cap 30 to a certain extent. At the same time, this design can adapt to the deformation law of the inner liner 20 and achieve the best assembly effect between the end cap 30 and the inner liner 20.

[0058] Figure 5 The second schematic diagram of the end cap 30 provided in this embodiment is shown. Figure 6 The third schematic diagram of the end cap 30 provided in this embodiment is shown. Figures 5-6 As shown, the circumferential extension of the deformation clearance space 302 corresponding to the first mounting port 3011 extends toward the first inner liner 21 to form a first extension rib 3021; ​​and / or the circumferential extension of the through hole 304 extends toward the first inner liner 21 to form a second extension rib 3041. By providing the first extension rib 3021 and the second extension rib 3041, the contact area and supporting force between the first interface portion 211 and the corresponding deformation clearance space 302, and between the through hole 304 and the second interface portion 212, can be increased, thereby further ensuring the assembly effect between the inner liner 20 and the end cap 30 and the stability of the whole machine.

[0059] In this embodiment, a sponge strip is attached to the connection between the first inner liner 21 and the first interface portion 211; a sponge strip is attached to the connection between the first inner liner 21 and the second interface portion 212; and sponge strips are attached to the openings of the two inner liners 20. By providing the sponge strips, the tiny gaps between the first interface portion 211 and the first extension rib 3021, between the second interface portion 212 and the second extension rib 3041, and between the two inner liners 20 and their corresponding mounting openings 301 can be filled, preventing leakage of the foaming material, and at the same time, it can play a role in heat insulation, protection, and shock absorption.

[0060] To ensure the structural strength of the end cap 30, a reinforcing structure 50 is provided on the side of the end cap 30 near the inner liner 20, located between the two mounting openings 301. Specifically, the reinforcing structure 50 includes intersecting horizontal ribs 51 and vertical ribs 52. The intersecting horizontal ribs 51 and vertical ribs 52 can form a grid structure to jointly bear external loads, effectively disperse stress, and thus reduce the possibility of local deformation of the end cap 30.

[0061] like Figure 6 As shown, an injection port 308 is provided on the end cap 30. The injection port 308 is used to inject foaming material from the side of the end cap 30 away from the inner liner 20 into the receiving space 101. That is, after the end cap 30 and the outer shell 10 are assembled, the foaming material can be injected from the outside of the receiving space 101 through the injection port 308 into the space between the cavity wall of the receiving space 101 and the inner liner 20. This allows the foaming material to be conveniently injected into the receiving space 101 in the optimal injection method using a spray gun or other auxiliary tools, filling the space between the cavity wall of the receiving space 101 and the inner liner 20, thereby effectively preventing overflow. In this embodiment, there is one injection port 308. Of course, in other embodiments, there can be two, three, four, or even more injection ports 308. Designers can adjust the number and arrangement of the injection ports 308 according to actual injection requirements.

[0062] Figure 7 A structural schematic diagram of the maintenance cover 40 provided in this embodiment is shown. Figure 7 and combined Figure 1 , Figure 5 As shown, the dual-tank water heater also includes a maintenance cover 40. An electrical compartment 306 is located on the side of the end cover 30 opposite to the inner tank 20. The electrical compartment 306 is used to install the power supply board and thermostat. The maintenance cover 40 is detachably sealed to the maintenance opening 3060 of the electrical compartment 306. By providing the maintenance cover 40, it can be used to shield and protect the power supply board and thermostat. Furthermore, because the maintenance cover 40 is detachably connected to the end cover 30, it also facilitates the removal of the maintenance cover 40 by operators to inspect and repair the components (power supply board and thermostat) installed in the electrical compartment 306.

[0063] like Figure 4 and Figure 5 As shown, the electrical compartment 306 is provided with a first mounting slot 3061 and a second mounting slot 3062. The first mounting slot 3061 is used to install the power supply board, and the second mounting slot 3062 is used to install the thermostat of the water heater. In this embodiment, the first mounting slot 3061 extends along the axial direction of the mounting opening 301, that is, the power supply board is inserted into the first mounting slot 3061 along the axial direction of the mounting opening 301. This arrangement can save the installation space of the power supply board and improve the space utilization rate within the electrical compartment 306.

[0064] Optionally, at least one limiting post 3065 is provided around the first mounting slot 3061 within the electrical compartment 306. A snap-fit ​​member 3067 is detachably connected to the limiting post 3065, and the snap-fit ​​member 3067 is provided with a slot. When the power board is inserted into the first mounting slot 3061, the operator can install the snap-fit ​​member 3067 onto the limiting post 3065, and the top of the power board can be limited in the slot of the snap-fit ​​member 3067, thereby achieving the limiting and fixing of the power board to ensure that the power board will not loosen or shift, which is beneficial to maintaining the stability and reliability of the electrical connection. Of course, in other embodiments, the limiting post 3065 can also be provided with a threaded hole, and a limiting screw is threaded into the threaded hole of the limiting post 3065, with the screw head of the limiting screw limiting and abutting against the top of the power board. This design can also achieve the above-mentioned effect.

[0065] In this embodiment, the snap-fit ​​component 3067 is snapped and fixed to the limiting post 3065, which is simple in structure and easy to operate.

[0066] Optionally, a wire clamping structure 3064 is provided in the electrical compartment 306. The wire clamping structure 3064 is used to fix and constrain the power cord to ensure that the power cord does not loosen or shift, which helps to maintain the stability and reliability of the electrical connection.

[0067] Optionally, a cable management channel 3063 is provided in the electrical room 306. The cable management channel 3063 is used for threading wire harnesses, thereby ensuring the tidiness of the electrical room 306. This embodiment does not limit the specific number of cable management channels 3063. Designers can adjust the number and arrangement of cable management channels 3063 according to actual needs. For example, the number of cable management channels 3063 can be one, two, three, four, or even more.

[0068] Figure 8 It shows Figure 5 A schematic diagram of a local structure. (For example...) Figure 8 and combined Figure 4 , Figure 7As shown, the end cap 30 is provided with a snap-fit ​​hole 309, and the maintenance cover 40 is provided with a snap fastener 402 corresponding to the snap-fit ​​hole 309. The snap fastener 402 snaps into the snap-fit ​​hole 309, thereby realizing a detachable connection between the end cap 30 and the maintenance cover 40, which is convenient for operation and provides a secure connection. Of course, in other embodiments, the end cap 30 and the maintenance cover 40 can also be connected by fasteners, achieving the same effect.

[0069] Optionally, a first annular rib 3066 is provided inside the electrical compartment 306, and the first annular rib 3066 forms a limiting groove 307 with the inner wall of the electrical compartment 306; the outer periphery of the maintenance cover 40 extends along its axial direction to form a second annular rib 401. When the maintenance cover 40 is closed on the end cover 30, the second annular rib 401 is inserted into the limiting groove 307, and the snap-fit ​​hole 309 is opened on the first annular rib 3066. By setting the first annular rib 3066 and the second annular rib 401, the stability of the connection between the end cover 30 and the maintenance cover 40 can be improved, and the sealing performance of the entire double-tank water heater can be guaranteed.

[0070] Optionally, at least one connecting rib 303 connects the first annular rib 3066 and the inner wall of the electrical compartment 306. The connecting rib 303 improves the structural strength of the first annular rib 3066, preventing it from shifting relative to the end cover 30 after repeated disassembly and reassembly. Optionally, the second annular rib 401 has a clearance groove 4011 for accommodating the connecting rib 303, allowing it to be accommodated and accommodated after the maintenance cover 40 is assembled with the end cover 30. Optionally, the clearance groove 4011 is L-shaped. When the maintenance cover 40 is placed on the end cover 30, the L-shaped clearance groove 4011 can accommodate and limit the connecting rib 303, preventing it from coming out of the clearance groove 4011 during use.

[0071] like Figure 5 , Figures 7-8 As shown, in this embodiment, the first annular rib 3066 is a roughly square annular structure formed by four strip ribs connected end to end. Each of the two opposing strip ribs has a snap-fit ​​hole 309, and the maintenance cover 40 has a corresponding buckle 402 for each snap-fit ​​hole 309. After the buckle 402 engages with the corresponding snap-fit ​​hole 309, it provides support for the two strip ribs. The other two opposing strip ribs are connected to the inner wall of the electrical compartment 306 by connecting ribs 303. This arrangement simplifies the structure of the end cover 30 and the maintenance cover 40 while ensuring their structural strength.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A dual-tank water heater, characterized in that, include: The outer shell (10) has an accommodating space (101) inside, and the end of the outer shell (10) has an end opening (102) that communicates with the accommodating space (101). Two inner liner (20) are arranged side by side and are both housed in the accommodating space (101); An end cap (30) has at least a straight segment (3001) on its outer edge, and the shape of the end opening (102) is adapted to the shape of the end cap (30). The end cap (30) is provided with an installation port (301) and a deformation clearance space (302) connected to the installation port (301) at the position corresponding to each inner liner (20). The end cap (30) covers the end opening (102), and the liner opening of each inner liner (20) is installed in the corresponding installation port (301).

2. The dual-tank water heater according to claim 1, characterized in that, The two deformation clearance spaces (302) are respectively located on the side of the corresponding mounting port (301) away from the central axis of the end cap (30).

3. The dual-tank water heater according to claim 1, characterized in that, The two inner liner (20) are respectively the first inner liner (21) and the second inner liner (22), and the two mounting ports (301) are respectively the first mounting port (3011) corresponding to the first inner liner (21) and the second mounting port (3012) corresponding to the second inner liner (22); The first inner liner (21) is provided with a first interface portion (211) and a second interface portion (212). The first interface portion (211) is used to install a temperature detection element, and the second interface portion (212) is used to install a magnesium rod. The first interface portion (211) passes through the deformation clearance space (302) corresponding to the first mounting port (3011). The end cap (30) is also provided with a through hole (304) for the second interface portion (212) to pass through.

4. The dual-tank water heater according to claim 3, characterized in that, A sponge strip is attached to the connection between the first inner liner (21) and the first interface (211); And / or, a sponge strip is attached to the connection between the first inner liner (21) and the second interface (212); And / or, a sponge strip is attached to the opening of the two inner liner (20).

5. The dual-tank water heater according to claim 3, characterized in that, The circumferential side of the deformation clearance space (302) corresponding to the first mounting port (3011) extends toward the first inner liner (21) to form a first extension rib (3021); And / or, the circumferential side of the through hole (304) extends toward the first inner liner (21) to form a second extension rib (3041).

6. The dual-tank water heater according to claim 1, characterized in that, The outer edge of the end cap (30) includes several straight segments (3001) and several arc segments (3002), which are alternately arranged and connected end to end in sequence.

7. The dual-tank water heater according to any one of claims 1 to 6, characterized in that, An electrical compartment (306) is provided on the side of the end cap (30) away from the inner liner (20), and the electrical compartment (306) is used to install a power board and a thermostat; The dual-tank water heater also includes a maintenance cover (40), which is detachably sealed to the maintenance opening (3060) of the electrical compartment (306).

8. The dual-tank water heater according to claim 7, characterized in that, The end cap (30) is provided with a limiting groove (307), and the outer periphery of the maintenance cover (40) extends along its axial direction to form a second annular rib (401), which is inserted into the limiting groove (307).

9. The dual-tank water heater according to claim 7, characterized in that, The electrical compartment (306) is provided with a first mounting groove (3061) extending along the axial direction of the mounting port (301), and the first mounting groove (3061) is used to mount the power board; And / or, the electrical compartment (306) is provided with a second mounting slot (3062), the second mounting slot (3062) being used to mount the thermostat; And / or, the electrical compartment (306) is provided with a wire clamping structure (3064) for fixing the power cord; And / or, the electrical compartment (306) is provided with a cable management channel (3063) for threading wires.

10. The dual-tank water heater according to any one of claims 1 to 6, characterized in that, The end cap (30) is also provided with a reinforcing structure (50) on the side near the inner liner (20), and the reinforcing structure (50) is located between the two mounting ports (301); And / or, the end cap (30) is provided with a filling port (308).

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