Water heater

Abstract

The utility model discloses a water heater, include: inner bag, the inner bag inside forms the cavity, the inner wall surface of cavity forms and is connected with the pipeline interface of cavity intercommunication has seted up the connecting area, the connecting area is equipped with with the pipeline interface intercommunication's pipeline interface, connecting pipeline, connecting pipeline set up in the inner bag outside and have the plug -in end, the plug -in end with The pipeline interface is connected with the end of plug -in end does not protrude in connecting area, protective layer, the protective layer is coated in the inner wall of cavity and covers connecting area, wherein the connecting area forms and protrudes the protruding part of the outer surface of inner bag. According to the water heater designed in the utility model, the protection effect of the protective layer to the inner bag is good, and the processing procedure of the connecting pipeline can be reduced, and the production efficiency of the water heater is improved.

Description

Technical Field

[0001] This utility model relates to the field of water heaters, and in particular to a water heater. Background Technology

[0002] In related technologies, the inner tank of an electric water heater is equipped with inlet and outlet water pipes. These pipes are typically inserted into the pipe interface of the inner tank and welded to it. An enamel layer is required on the inner wall of the tank to prevent water corrosion. However, due to the micropores in the enamel layer, the inner wall still comes into contact with water, resulting in poor corrosion protection from the enamel layer.

[0003] In some existing technologies, an anti-corrosion protective layer can be installed on the inner wall of the tank. This layer can be formed by rotational molding of polymer materials or by powder coating of non-polymer materials, providing better corrosion protection for the inner wall of the tank. However, because the water pipe connector is inserted into the inner tank, during the molding process of this anti-corrosion protective layer, material will accumulate at the connection between the water pipe connector and the inner wall of the tank. This layer may break down during the cooling process, potentially exposing the inner wall of the tank and affecting its anti-corrosion effect. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide a water heater. The water heater designed according to this utility model has a protective layer that provides good protection for the inner tank, and it can reduce the processing steps of the connecting pipes, thereby improving the production efficiency of the water heater.

[0005] The water heater according to this utility model includes: an inner tank, wherein a cavity is formed inside the inner tank, and a connecting area is formed on the inner wall surface of the cavity, wherein a pipe interface communicating with the cavity is provided in the connecting area; a connecting pipe, wherein the connecting pipe is disposed outside the inner tank and has a plug-in end, the plug-in end is connected to the pipe interface and the end of the plug-in end does not protrude from the connecting area; and a protective layer, wherein the protective layer is coated on the inner wall of the cavity and covers the connecting area; wherein the connecting area has a protrusion protruding toward the outer surface of the inner tank.

[0006] According to this utility model, the water heater's connecting pipe is designed so that the end of its plug does not protrude from the connection area of ​​the inner tank. This ensures that there are no sharp corners between the end face of the plug and the inner wall of the inner tank, guaranteeing uniform coating during the molding of the protective layer and preventing the accumulation of protective layer material at the corners. This avoids damage to the protective layer at the connection between the end face of the plug and the inner wall of the inner tank, improving the protective effect of the protective layer on the inner tank. Furthermore, the connection area is designed with a protruding part to connect with the connecting pipe, which can unify the end face of the plug of the connecting pipe, reduce the processing steps of the connecting pipe, improve the processing efficiency of the connecting pipe, and avoid increasing the processing cost of the connecting pipe, thereby reducing the production cost of the water heater.

[0007] According to some embodiments of the present invention, the protrusion includes: a peripheral wall, at least a portion of which surrounds the connecting pipe, one side edge of which is connected to the inner liner and the other side edge of which extends away from the inner liner; and an end wall, which is disposed at the edge of the peripheral wall away from the inner liner and has the pipe interface.

[0008] According to some embodiments of this utility model, the inner liner is cylindrical, and the circumferential wall protrudes axially from the outer surface of the inner liner by a dimension b, satisfying: 0mm < b ≤ 15mm.

[0009] According to some embodiments of this utility model, the following condition is met: 0mm < b ≤ 3mm.

[0010] According to some embodiments of this utility model, the end wall is orthogonally arranged to the axis of the inner liner.

[0011] According to some embodiments of the present invention, at least a portion of the end face of the plug-in end is adapted to fit against the outer wall surface of the end wall.

[0012] According to some embodiments of the present invention, the plug-in end is plugged into the pipeline interface and is provided with a first positioning part, and the end wall is provided with a second positioning part suitable for positioning and cooperating with the first positioning part.

[0013] According to some embodiments of the present invention, the end wall defines the inner wall of the pipeline interface with a dimension d1 in the thickness direction of the end wall; the first positioning part is constructed as a positioning protrusion protruding from the end face of the plug-in end, and the protrusion dimension in the thickness direction of the end wall is d2; the end face of the plug-in end is adapted to fit against the outer wall surface of the inner liner; the outer wall surface of the positioning protrusion is adapted to fit against the inner edge of the pipeline interface, satisfying: d2≤d1.

[0014] According to some embodiments of the present invention, the inner liner is cylindrical, the connecting pipe is disposed at the axial end of the inner liner, and the axial direction of the connecting pipe is parallel to the axial direction of the inner liner.

[0015] According to some embodiments of the present invention, the inner liner includes: a cylindrical body, wherein the cavity is formed inside the cylindrical body and one end of the cylindrical body is open in the axial direction to form an open end; and an end cap, wherein the end cap is disposed on the open end and forms the connecting area.

[0016] In summary, the water heater of this utility model designs the connecting pipe so that the end of its plug does not protrude from the connection area of ​​the inner tank. This ensures that there are no sharp corners between the end face of the plug and the inner wall of the inner tank, guaranteeing uniform coating during the molding of the protective layer and preventing the accumulation of protective layer material at the corners. This avoids damage to the protective layer at the connection between the end face of the plug and the inner wall of the inner tank, improving the protective effect of the protective layer on the inner tank. Furthermore, the connection area is designed with a protrusion to connect with the connecting pipe, which can unify the end face of the plug of the connecting pipe, reduce the processing steps of the connecting pipe, improve the processing efficiency of the connecting pipe, and avoid increasing the processing cost of the connecting pipe, thereby reducing the production cost of the water heater.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a water heater structure according to some embodiments of the present utility model.

[0019] Figure 2 This is a schematic diagram of the connection pipe and the connection area according to the first embodiment of the present utility model.

[0020] Figure 3 This is a schematic diagram of a water heater structure according to other embodiments of the present invention.

[0021] Figure 4 This is a schematic diagram of the connection pipe and the connection area according to the second embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the connection pipe and the connection area according to the third embodiment of the present utility model.

[0023] Figure label: 1. Water heater; 10. Inner liner; 10a. Cavity; 101. Connection area; 10b. Pipe interface; 11. Cylinder; 12. End cap; 13. Protrusion; 131. Peripheral wall; 132. End wall; 20. Connecting pipe; 21. Insertion end; 211. Positioning protrusion. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In related technologies, the inner tank of an electric water heater is equipped with inlet and outlet water pipes. These pipes are typically inserted into the pipe interface of the inner tank and welded to it. An enamel layer is required on the inner wall of the tank to prevent water corrosion. However, due to the micropores in the enamel layer, the inner wall still comes into contact with water, resulting in poor corrosion protection from the enamel layer.

[0030] In some existing technologies, an anti-corrosion protective layer can be installed on the inner wall of the tank. This layer can be formed by rotational molding of polymer materials or by powder coating of non-polymer materials, providing better corrosion protection for the inner wall of the tank. However, because the water pipe connector is inserted into the inner tank, during the molding process of this anti-corrosion protective layer, material will accumulate at the connection between the water pipe connector and the inner wall of the tank. This layer may break down during the cooling process, potentially exposing the inner wall of the tank and affecting its anti-corrosion effect.

[0031] The following is for reference. Figures 1-5 A water heater 1 according to an embodiment of the present utility model is described.

[0032] like Figures 1-5 As shown, the water heater 1 according to this utility model includes: an inner tank 10, a connecting pipe 20, and a protective layer. A cavity 10a is formed inside the inner tank 10, and a connecting area 101 is formed on the inner wall surface of the cavity 10a. The connecting area 101 has a pipe interface 10b communicating with the cavity 10a. The connecting pipe 20 is disposed outside the inner tank 10 and has a plug end 21. The plug end 21 is connected to the pipe interface 10b, and the end of the plug end 21 does not protrude from the connecting area 101. The protective layer is coated on the inner wall of the cavity 10a and covers the connecting area 101. The connecting area 101 has a protrusion 13 protruding toward the outer surface of the inner tank 10.

[0033] Specifically, the cavity 10a of the inner tank 10 is suitable for storing the medium. To isolate the inner tank 10 from the medium, a protective layer can be coated on the inner wall of the inner tank 10 to prevent the medium from directly contacting the inner wall of the inner tank 10 and to protect the inner tank 10 from corrosion. The connecting pipe 20 provided in the water heater 1 is used to connect the cavity 10a to the external structure. The inner tank 10 forms a connection area 101 suitable for connecting with the connecting pipe 20, and the end of the plug end 21 of the connecting pipe 20 does not protrude from the connection area 101.

[0034] The phrase "the end of the plug-in terminal 21 does not protrude from the connection area 101" means that the plug-in terminal 21 is inserted into the pipe interface 10b with its end flush with the inner wall of the inner liner 10, or the plug-in terminal 21 is inserted into the pipe interface 10b with its end recessed into the inner wall of the inner liner 10, or the end of the plug-in terminal 21 is in contact with the outer wall of the inner liner 10. The design can be tailored to the specific circumstances and is not limited here. The fact that the end of the plug-in terminal 21 does not protrude from the connection area 101 ensures that there are no sharp corners between the end face of the plug-in terminal 21 and the inner wall of the inner liner 10, guaranteeing uniform coating during the formation of the protective layer and preventing the accumulation of protective layer material at the corners. This avoids damage to the protective layer at the connection between the end face of the plug-in terminal 21 and the inner wall of the inner liner 10, thus improving the protective effect of the protective layer on the inner liner 10.

[0035] Furthermore, the connection area 101 is designed with a protrusion 13 to connect with the connecting pipe 20. It is understandable that since the wall of the inner liner 10 is generally an arc-shaped wall, the connecting pipe 20 must ensure that the end of the plug 21 does not protrude from the connection area 101, while the plug 21 also needs to adapt to the shape of the inner liner 10 wall. If there is no protrusion 13, the plug 21 also needs to be punched with an arc end face, which is complicated. In addition, since the pipe interface 10b can be set in various positions, the arc required for the end face of the plug 21 of the connecting pipe 20 may also be different, which will increase the processing cost of the connecting pipe 20. The protrusion 13 design allows the end face of the plug 21 of the connecting pipe 20 to only need to adapt to the wall surface of the protrusion 13, making the end face of the plug 21 of the connecting pipe 20 uniform, reducing processing steps, improving processing efficiency, and avoiding increasing the processing cost of the connecting pipe 20.

[0036] According to this utility model, the water heater 1 has a design where the end of the connector 20 does not protrude from the connection area 101 of the inner tank 10, so that there are no sharp corners between the end face of the connector 21 and the inner wall of the inner tank 10. This ensures that the protective layer is evenly coated during molding and avoids the accumulation of protective layer material at the corners, thereby preventing damage to the protective layer at the connection between the end face of the connector 21 and the inner wall of the inner tank 10, and improving the protective effect of the protective layer on the inner tank 10. Furthermore, the connection area 101 is designed with a protrusion 13 to connect with the connector 20, which can unify the end face of the connector 21 of the connector 20, reduce the processing steps of the connector 20, improve the processing efficiency of the connector 20, and avoid increasing the processing cost of the connector 20, thereby reducing the production cost of the water heater 1.

[0037] Here, the protective layer is generally made of polymer material through rotational molding. The protective layer made of polymer material through rotational molding has a better anti-corrosion effect on the inner wall of the inner liner 10. Furthermore, since there are no sharp corners between the end face of the connector 21 of the connecting pipe 20 and the inner wall of the inner liner 10, the protective layer made of polymer material through rotational molding can be evenly coated during molding, resulting in a better protective effect on the inner liner 10.

[0038] Furthermore, the pipe interfaces 10b on the inner liner 10 can be configured as multiple spaced-apart pipes, and the connecting pipes 20 can be configured as multiple pipes corresponding one-to-one with the pipe interfaces 10b. Each connecting pipe 20 can play a different role. For example, one of the multiple connecting pipes 20 can be a water inlet pipe, one of the multiple connecting pipes 20 can be a water outlet pipe, or other connecting pipes 20 connected to the inner liner 10 can also be connected to the inner liner 10 using the above connection method.

[0039] Furthermore, the connecting pipe 20 can be welded to the inner liner 10. Specifically, at least a portion of the end face of the plug end 21 of the connecting pipe 20 is welded to the outer wall surface of the inner liner 10 where the pipe interface 10b is formed. During the process of assembling the plug end 21 of the connecting pipe 20 with the pipe interface 10b of the inner liner 10, to ensure that the relative position of the connecting pipe 20 and the inner liner 10 remains unchanged, a positioning part can be designed on the connecting pipe 20 and the inner liner 10, or an additional positioning structure can be used to restrict the relative position of the connecting pipe 20 and the inner liner 10, thereby ensuring the smooth progress of the welding process.

[0040] In this utility model, the water heater 1 can be a single inner tank 10 or a multi-inner tank 10 structure. When the water heater 1 is a multi-inner tank 10 structure, the inner tanks 10 are constructed to be at least two connected to each other. At least two inner tanks 10 can be designed to be connected. At this time, at least one of the multiple inner tanks 10 is designed with a connecting pipe 20. At least two inner tanks 10 can also be connected but not connected. In this case, each inner tank 10 can be designed with a connecting pipe 20.

[0041] According to some embodiments of this utility model, such as Figure 2 , Figure 4 , Figure 5 As shown, the protrusion 13 includes a peripheral wall 131 and an end wall 132. At least a portion of the peripheral wall 131 surrounds the connecting pipe 20. One edge of the peripheral wall 131 is connected to the inner liner 10, and the other edge of the peripheral wall 131 extends away from the inner liner 10. The end wall 132 is located at the edge of the peripheral wall 131 away from the inner liner 10 and has a pipe interface 10b. Specifically, the peripheral wall 131 protrudes from the inner liner 10 so that at least a portion of the end wall 132 can be located away from the inner liner 10. The end wall 132 has a pipe interface 10b. In this case, the end face of the insertion end 21 of the connecting pipe 20 only needs to be adapted to the wall surface of the end wall 132, so as to unify the end face of the insertion end 21 of the connecting pipe 20, reduce processing steps, improve processing efficiency, and avoid increasing the processing cost of the connecting pipe 20.

[0042] According to some embodiments of this utility model, such as Figures 1-5 As shown, the inner liner 10 is cylindrical in shape, and the peripheral wall 131 protrudes axially from the outer surface of the inner liner 10 by a dimension b, satisfying: 0mm < b ≤ 15mm. Specifically, the peripheral wall 131 protrudes axially from the outer surface of the inner liner 10 by a dimension b. It can be understood that b needs to be greater than 0mm to ensure that at least part of the peripheral wall 131 extends axially along the inner liner 10, so that the peripheral wall 131 can make at least part of the end wall 132 move away from the inner liner 10 axially. Furthermore, the value of b should not be too large, as an excessively large value will result in a structural strength difference in the connection area 101 where the protrusion 13 is formed, affecting the service life of the inner liner 10. Therefore, the value range of b satisfies: 0mm < b ≤ 15mm, so as to reduce the impact of the protrusion 13 on the structural strength of the connection area 101 while making at least part of the end wall 132 move away from the inner liner 10 axially. For example, b can take values ​​of 0.05mm, 1mm, 2.5mm, 5mm, 13mm, etc.

[0043] Figure 1 This is a schematic diagram of the structure of a water heater 1 according to some embodiments of the present invention. Figure 2 for Figure 1 The schematic diagram of the connection between the connecting pipe 20 and the connection area 101 is also based on the first embodiment of this utility model. In this embodiment, a pulse fatigue test is performed with a pressure of 1.0 MPa (10 kg) (the operating environment of the water heater 1 × 1.2 safety factor), a pressure increase of 1.9 s, and a pressure decrease of 0.9 s. After 25,000 cycles, the protrusion 13 experiences stress cracking and leakage (failure).

[0044] Figure 3 This is a schematic diagram of the structure of a water heater 1 according to other embodiments of the present invention. Figure 4 and Figure 5 All Figure 3 Schematic diagram of the mating point between the connecting pipe 20 and the connecting area 101. Figure 4 According to the second embodiment of this utility model, Figure 5 According to the third embodiment of this utility model, in these two embodiments, a pulse fatigue test was conducted with a pressure of 1.0 MPa (10 kg) (the operating environment of water heater 1 × 1.2 safety factor), a pressure increase of 1.9 s, and a pressure decrease of 0.9 s. After 220,000 cycles, the protrusion 13 experienced stress cracking and leakage (failure).

[0045] Understandably, as the value of b increases, the structural strength of the portion of the connecting area 101 with the protrusion 13 decreases, and the inner liner 10's ability to withstand fatigue pulses during heating and water dispensing also decreases, thus affecting the service life of the inner liner 10. Tests show that the pulse life of the inner liner 10 needs to reach over 100,000 cycles within an 8-10 year service life. If the value of b is 10-15 mm, the pulse life will decrease to 10,000-50,000 cycles; if the value of b is 5-10 mm, the pulse life will decrease to 50,000-100,000 cycles. Therefore, preferably, the value of b is less than 5 mm to optimize the structural strength of the portion of the connecting area 101 with the protrusion 13 as much as possible, thereby improving the service life of the inner liner 10.

[0046] Furthermore, such as Figure 4 , Figure 5 As shown, the following condition must be met: 0mm < b ≤ 3mm. Specifically, the extension direction of the end wall 132 can intersect with the axial direction of the inner liner 10. In this case, the protrusion 13 is an oblique boss on the inner liner 10, and the protrusion dimension b of the peripheral wall 131 in the axial direction of the inner liner 10 is not greater than 3mm. This can improve the processing efficiency of the end face of the connector 21 of the connecting pipe 20 while optimizing the structural strength of the part of the connecting area 101 with the protrusion 13.

[0047] According to some embodiments of this utility model, such as Figure 2 As shown, the end wall 132 is orthogonal to the axis of the inner liner 10. Specifically, the extension direction of the end wall 132 is orthogonal to the axis of the inner liner 10. At this time, the end face of the connector 21 of the connecting pipe 20 is a plane, which can effectively reduce the processing steps of the connector 21 of the connecting pipe 20, improve the processing efficiency of the connector 20 connector 21, and reduce the processing cost of the connecting pipe 20.

[0048] According to some embodiments of this utility model, such as Figure 2 , Figure 4 , Figure 5As shown, at least a portion of the end face of the plug-in terminal 21 is adapted to abut against the outer wall surface of the end wall 132. Here, the end face of the plug-in terminal 21 may be fully or partially abut against the outer wall surface of the end wall 132 to facilitate welding connection between the end face of the plug-in terminal 21 and the outer wall surface of the end wall 132. Wherein, the end face of the plug-in terminal 21 being fully abut against the outer wall surface of the end wall 132 can mean, for example... Figure 4 As shown, the end face of the plug-in terminal 21 only contacts the outer wall surface of the end wall 132. The fact that the end face of the plug-in terminal 21 can partially fit against the outer wall surface of the end wall 132 means, for example... Figure 5 As shown, a portion of the plug end 21 is inserted into the pipe interface 10b, and the other portion of the plug end 21 contacts the outer wall surface of the pipe interface 10b formed by the end wall 132.

[0049] According to some embodiments of this utility model, such as Figure 5 As shown, the plug end 21 is plugged into the pipe interface 10b and is provided with a first positioning part, and the end wall 132 is provided with a second positioning part suitable for positioning and cooperating with the first positioning part. Specifically, in the process of merging the plug end 21 of the connecting pipe 20 with the pipe interface 10b of the inner liner 10, in order to ensure that the relative position of the connecting pipe 20 and the inner liner 10 remains unchanged, a first positioning part and a second positioning part can be designed on the connecting pipe 20 and the inner liner 10 respectively. Furthermore, a first positioning part is provided on the plug end 21 and a second positioning part is provided on the end wall 132. The first positioning part and the second positioning part are positioned and cooperated to ensure the smooth progress of the welding process.

[0050] According to some embodiments of this utility model, such as Figure 5 As shown, the end wall 132 defines the inner wall of the pipe interface 10b with a dimension d1 in the thickness direction of the end wall 132; the first positioning part is constructed as a positioning protrusion 211 protruding from the end face of the plug end 21, and the protrusion dimension in the thickness direction of the end wall 132 is d2. The end face of the plug end 21 is adapted to fit with the outer wall surface of the inner liner 10, and the outer wall surface of the positioning protrusion 211 is adapted to fit with the inner edge of the pipe interface 10b, satisfying: d2≤d1.

[0051] Specifically, the positioning protrusion 211 extends into the pipe interface 10b. At this time, the outer wall surface of the positioning protrusion 211 is in contact with the inner edge of the pipe interface 10b, and the end face of the insertion end 21 is in contact with the outer wall surface of the inner liner 10. Furthermore, the dimension d1 of the inner wall of the pipe interface 10b in the thickness direction of the end wall 132 and the protrusion dimension d2 of the positioning protrusion 211 in the thickness direction of the end wall 132 satisfy: d2≤d1, so that the positioning protrusion 211 does not protrude beyond the end wall 132 defining the pipe interface. The positioning protrusion 211 can be flush with the inner wall of the pipe interface 10b defined by the end wall 132, or it can be recessed into the inner wall of the pipe interface 10b defined by the end wall 132. This ensures that there are no sharp corners between the end face of the plug end 21 and the inner wall of the inner liner 10, guaranteeing uniform coating during the forming of the protective layer and preventing the protective layer material from accumulating at the corners. This prevents damage to the protective layer at the connection between the end face of the plug end 21 and the inner wall of the inner liner 10, and improves the protective effect of the protective layer on the inner liner 10.

[0052] According to some embodiments of this utility model, such as Figure 1 , Figure 2 As shown, the inner tank 10 has a cylindrical structure, and the connecting pipe 20 is located at the axial end of the inner tank 10, with the axial direction of the connecting pipe 20 parallel to that of the inner tank 10. Specifically, the connecting pipe 20 is located at the axial end of the inner tank 10, which makes the overall radial dimension of the water heater 1 small, and the connecting pipe 20 can be led out from the inner tank 10 in the axial direction, which also facilitates the pipe arrangement of the water heater 1.

[0053] According to some embodiments of this utility model, such as Figure 1 , Figure 2 As shown, the inner liner 10 includes a cylindrical body 11 and an end cap 12. The cylindrical body 11 has a cavity 10a inside, and one end of the cylindrical body 11 is open in the axial direction to form an open end. The end cap 12 is placed on the open end and forms a connection area 101. Specifically, the pipe interface 10b is opened on the end cap 12. The connecting pipe 20 can be connected to the end cap 12 first, and then the end cap 12 can be connected to the cylindrical body 11. Alternatively, the end cap 12 can be connected to the cylindrical body 11 first, and then the connecting pipe 20 can be connected to the end cap 12. The choice can be made according to actual needs and is not limited here.

[0054] In summary, according to the present invention, the water heater 1 has the connecting pipe 20 designed so that the end of its plug 21 does not protrude from the connecting area 101 of the inner tank 10. This ensures that there are no sharp corners between the end face of the plug 21 and the inner wall of the inner tank 10, guaranteeing uniform coating during the molding of the protective layer and preventing the accumulation of protective layer material at the corners. This avoids damage to the protective layer at the connection between the end face of the plug 21 and the inner wall of the inner tank 10, thus improving the protective effect of the protective layer on the inner tank 10. Furthermore, the connecting area 101 is designed with a protrusion 13 to connect with the connecting pipe 20, which can unify the end face of the plug 21 of the connecting pipe 20, reduce the processing steps of the connecting pipe 20, improve the processing efficiency of the connecting pipe 20, and avoid increasing the processing cost of the connecting pipe 20, thereby reducing the production cost of the water heater 1.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0056] Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A water heater, characterized in that, include: The inner liner has a cavity inside, and the inner wall of the cavity has a connection area, which is provided with a pipe interface communicating with the cavity. A connecting pipe is provided outside the inner liner and has a plug end, the plug end is connected to the pipe interface and the end of the plug end does not protrude from the connecting area; A protective layer is applied to the inner wall of the cavity and covers the connection area; in The connecting area has a protrusion that protrudes toward the outer surface of the inner liner.

2. The water heater according to claim 1, characterized in that, The protrusion includes: A peripheral wall, at least a portion of which surrounds the connecting pipe, wherein one edge of the peripheral wall is in contact with the inner liner and the other edge of the peripheral wall extends away from the inner liner; An end wall is provided at the edge of the peripheral wall away from the inner liner and has the pipeline interface.

3. The water heater according to claim 2, characterized in that, The inner liner is cylindrical, and the circumferential wall protrudes axially from the outer surface of the inner liner by a dimension b, satisfying: 0mm < b ≤ 15mm.

4. The water heater according to claim 3, characterized in that, The following condition must be met: 0mm < b ≤ 3mm.

5. The water heater according to claim 3, characterized in that, The end wall is orthogonal to the axis of the inner liner.

6. The water heater according to claim 2, characterized in that, At least a portion of the end face of the plug terminal is adapted to fit against the outer wall surface of the end wall.

7. The water heater according to claim 2 or 6, characterized in that, The plug-in end is plugged into the pipeline interface and is provided with a first positioning part, and the end wall is provided with a second positioning part suitable for positioning and cooperating with the first positioning part.

8. The water heater according to claim 7, characterized in that, The end wall defines the dimension d1 of the inner wall of the pipeline interface in the thickness direction of the end wall; The first positioning part is constructed as a positioning protrusion protruding from the end face of the plug-in end, and the protrusion dimension in the thickness direction of the end wall is d2. The end face of the plug-in end is adapted to fit against the outer wall surface of the inner liner, and the outer wall surface of the positioning protrusion is adapted to fit against the inner edge of the pipeline interface, satisfying: d2≤d1.

9. The water heater according to claim 1, characterized in that, The inner liner is cylindrical, and the connecting pipe is located at the axial end of the inner liner, with the axial direction of the connecting pipe parallel to the axial direction of the inner liner.

10. The water heater according to claim 1, characterized in that, The inner liner includes: A cylindrical body, wherein the cavity is formed inside the cylindrical body and one axial end of the cylindrical body is open to form an open end; An end cap is provided on the open end and forms the connection area.

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