Electric water heater

Abstract

The utility model discloses an electric water heater, which comprises a container, a water inlet pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe and a water outlet pipe, the water inlet pipe is mounted on the joint; the water inlet pipe comprises an outer pipe and an inner pipe, the outer pipe is provided with an outer pipe water outlet, the outer pipe water outlet and at least part of the outer pipe are located in the container, the part, located below the outer pipe water outlet, of the outer pipe is connected with the connector, and the inner pipe extends into the container through the connector through hole. The inner pipe is further provided with an inner pipe water outlet located above the inner pipe water inlet and the outer pipe water outlet, the inner pipe is detachably connected with the connector, and after the inner pipe is detached from the connector, water in the container can flow out through the outer pipe water outlet and the connector through hole. The water inlet assembly provided by the embodiment of the utility model not only has an anti-electricity function, but also is convenient for discharging water in the container through the drain pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an electric water heater. Background Art

[0002] Water heaters are household appliances commonly used in people's daily lives. Among them, water heaters can be divided into electric water heaters, gas water heaters, solar water heaters, heat pump water heaters, etc. according to different heating methods.

[0003] Among them, taking the electric heater as an example, it is usually equipped with a tank, on which are usually provided a water inlet pipe, a water outlet pipe and an electric heating pipe, etc. In actual use, the water inlet pipe is used to introduce tap water into the tank, and when the water in the tank is heated by the electric heating pipe, the hot water on the top of the tank can be output from the water outlet pipe, thereby meeting the user's demand for hot water.

[0004] At present, there are some scenarios in which the water in the tank of an electric water heater needs to be drained during use, for example, when the electric water heater needs to be repaired or parts need to be replaced, when the electric water heater needs to be relocated, when the electric water heater is not used for a long time, etc., the tank needs to be drained.

[0005] However, when emptying the tank, the applicant has found that: for the water inlet pipe with anti-electric function, if the water inlet pipe is not disassembled, the water in the tank has a long emptying path and is difficult to empty; if the water inlet pipe is disassembled as a whole, the outer shell of the electric water heater needs to be disassembled first, and then the joints that match the inner tank in the tank are removed, and the water inlet pipe is moved out of the tank as a whole, so that the water in the inner tank can be efficiently emptied. The above disassembly operation not only has a large workload and work intensity, but also if the joint connecting the water inlet pipe and the inner tank is disassembled and assembled multiple times, it may affect the sealing and reliability of the cooperation between the two.

[0006] Therefore, it is necessary to provide an electric water heater to solve at least one of the above problems. Utility Model Content

[0007] In view of the defects existing in the prior art, an electric water heater is provided in the embodiment of the utility model, which forms a new and easy-to-operate emptying method by optimizing and improving the structure of the water inlet component with anti-electricity function.

[0008] The specific technical solution of the implementation mode of the utility model is:

[0009] An electric water heater, comprising:

[0010] A gallbladder having a connecting portion;

[0011] A connector, the connector being connected to the gallbladder through the connecting portion, and the connector having a connector through hole penetrating the connector body;

[0012] A water inlet pipe, the water inlet pipe is installed on the joint;

[0013] The water inlet pipe comprises an outer pipe and an inner pipe at least partially located in the outer pipe,

[0014] The outer tube has an outer tube water outlet, the outer tube water outlet and at least a portion of the outer tube are located in the bile, and a portion of the outer tube located below the outer tube water outlet is connected to the joint.

[0015] The inner tube is detachably connected to the joint, the inner tube passes through the joint through hole and extends into the bile, the lower part of the inner tube is provided with an inner tube water inlet, the inner tube also has an inner tube water outlet located above the inner tube water inlet and above the outer tube water outlet, water can flow into the bile through the inner tube water inlet, the inner tube water outlet and the outer tube water outlet in sequence, when the inner tube is removed from the joint, the water in the bile can flow out through the outer tube water outlet and the joint through hole.

[0016] In a preferred embodiment, the lower end of the inner tube extends out of the lower end of the joint through hole, or the lower end of the inner tube is flush with the lower end of the joint through hole.

[0017] In a preferred embodiment, the electric water heater comprises a shell, the tank is arranged in the shell, and the lower end of the joint extends out of the shell.

[0018] In a preferred embodiment, the inner tube and the joint through hole are spaced apart, and the inner tube and the joint are sealed and matched.

[0019] In a preferred embodiment, the inner tube is sealingly matched with the joint through hole.

[0020] In a preferred embodiment, a seal is provided between the outer surface of the inner tube and the inner surface of the joint through hole, or a first mating portion is provided on the outer surface of the inner tube and a second mating portion is provided on the inner surface of the joint, and the first mating portion and the second mating portion form a sealing structure.

[0021] In a preferred embodiment, the lower portion of the inner tube is detachably connected to the lower portion of the joint.

[0022] In a preferred embodiment, the lower portion of the inner tube and the lower portion of the joint are sealed together via a sealing member.

[0023] In a preferred embodiment, the lower end of the seal extends out of the lower end of the inner tube or is flush with the lower end of the inner tube; and / or the lower end of the inner tube extends out of the lower end of the joint through hole or is flush with the lower end of the joint through hole.

[0024] In a preferred embodiment, the sealing member includes a first sealing portion, which is sleeved on the outer surface of the inner tube and located between the inner surface of the joint through hole and the outer surface of the inner tube.

[0025] In a preferred embodiment, the joint is used to connect a water supply pipe that supplies water to the water inlet pipe, and the seal also includes a second sealing portion, which at least partially covers at least a portion of the lower end surface of the joint and extends out of the lower end of the inner tube, and is used to seal the gap between the water supply pipe and at least a portion of the lower end surface of the joint when the water supply pipe is connected to the joint.

[0026] In a preferred embodiment, the lower portion of the inner tube has a limiting step portion, and the limiting step portion is located below the first sealing portion and is used to limit the first sealing portion.

[0027] In a preferred embodiment, the first sealing portion has a guide portion, and the guide portion is located at an upper end of the first sealing portion.

[0028] In a preferred embodiment, a connection structure is provided on the outer surface of the lower portion of the joint, and the connection structure is used to connect a water supply pipe that supplies water to the water inlet pipe.

[0029] In a preferred embodiment, the outer tube is a blind tube with a top blocked, the water outlet of the outer tube is close to or located at the bottom of the outer tube, and the water outlet of the inner tube is close to or located at the top of the inner tube.

[0030] In a preferred embodiment, the portion of the inner tube located in the outer tube does not contact the outer tube, or the portion of the inner tube located in the outer tube is detachably connected to the outer tube.

[0031] In a preferred embodiment, the lower portion of the outer tube is connected to the joint by a fixed connection or a snap connection.

[0032] In a preferred embodiment, the joint is provided with a first matching portion, and the lower portion of the outer tube is provided with a second matching portion, and the first matching portion and the second matching portion cooperate to fix or clamp the outer tube on the joint.

[0033] In a preferred embodiment, the first matching portion is integrally formed with the connector, or the first matching portion is fixedly connected to the connector, or the first matching portion is detachably connected to the connector.

[0034] In a preferred embodiment, the first matching portion includes a first annular groove, and the second matching portion includes a second annular groove matching the first annular groove or a plurality of pits distributed along the circumferential direction.

[0035] In a preferred embodiment, the first matching portion and the second matching portion are located in the bladder.

[0036] In a preferred embodiment, the connecting portion includes a stud, an outer surface of the stud is provided with an external thread, an upper portion of the joint is provided with an internal thread matching the external thread of the stud, and the first matching portion is located on the inner side of the internal thread.

[0037] In a preferred embodiment, the connecting portion includes a flange, and the outer periphery of the joint is provided with a flange matching with the connecting portion.

[0038] In a preferred embodiment, the electric water heater is a double-tank electric water heater, comprising: a first tank and a second tank connected to each other, the first tank is located below the second tank, and a flange for forming the connecting portion is located on the first tank. The connecting portion includes a flange, and a matching flange is provided on the periphery of the joint.

[0039] The technical solution of the utility model has the following significant beneficial effects:

[0040] The electric water heater provided in the embodiment of the present application can form a new emptying method by optimizing and improving the structure of the water inlet component with anti-electric function. When emptying is required, efficient emptying can be achieved by only pulling out the inner tube from the tank. There is no need to disassemble the outer shell of the electric water heater, the joint connecting the water inlet pipe and other parts. The operation is simple, the workload and work intensity are low, and even if the emptying is repeated frequently, the sealing and reliability of the tank fitting position will not be affected.

[0041] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which 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, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0043] Figure 1 A schematic diagram of the structure of an electric water heater provided in an embodiment of the present application;

[0044] Figure 2 for Figure 1 A schematic diagram of the structure of the water inlet pipe and the joint in the electric water heater provided in the embodiment of the present application;

[0045] Figure 3 for Figure 1 A front view of a water inlet pipe and a joint in an electric water heater provided in an embodiment of the present application;

[0046] Figure 4 for Figure 3 AA cross-sectional view of the water inlet pipe and the joint in the electric water heater provided in the embodiment of the present application;

[0047] Figure 5 for Figure 4 A local enlarged schematic diagram of point I in the middle;

[0048] Figure 6 for Figure 3 An exploded view of a water inlet pipe and a joint in an electric water heater provided in an embodiment of the present application;

[0049] Figure 7 This is a schematic diagram of the structure of another electric water heater provided in an embodiment of the present application;

[0050] Figure 8 for Figure 7 A schematic diagram of the structure of the water inlet pipe and the joint in the electric water heater provided in the embodiment of the present application;

[0051] Fig. 9 for Figure 7 A front view of a water inlet pipe and a joint in an electric water heater provided in an embodiment of the present application;

[0052] Fig.10 for Fig. 9 A BB cross-sectional view of a water inlet pipe and a joint in an electric water heater provided in an embodiment of the present application;

[0053] Fig.11 This is a schematic diagram of the electric water heater provided in an embodiment of the present application in an empty state after the inner pipe is removed.

[0054] Reference numerals of the present application:

[0055] 1. Gallbladder;

[0056] 11. The first courage;

[0057] 12. The second courage;

[0058] 10. Connecting part;

[0059] 101, gallbladder wall through hole;

[0060] 2. Connector;

[0061] 201, connector through hole;

[0062] 21. a first matching portion;

[0063] 22. Internal thread;

[0064] 23. Connection structure;

[0065] 24. Flange;

[0066] 25. Screw hole;

[0067] 3. External management;

[0068] 31. External pipe water outlet;

[0069] 32. second matching portion;

[0070] 33. Top;

[0071] 4. Inner tube;

[0072] 41. Inner pipe water inlet;

[0073] 42. Inner pipe water outlet;

[0074] 43. Limiting step;

[0075] 5. Seals;

[0076] 51. a first sealing portion;

[0077] 52. a second sealing portion;

[0078] 511. Guide part. DETAILED DESCRIPTION

[0079] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0080] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0082] For the water inlet pipe with integrated anti-electricity function, its inner tube and outer tube are installed on the joint from top to bottom. When it needs to be emptied, the water in the inner tank flows upward to the annulus between the inner tube and the outer tube through the opening at the bottom of the outer tube, flows into the opening at the top of the inner tube, and then flows out through the inner tube and the joint. The overall emptying path is long and the water flow resistance is large. Among them, the opening at the top of the inner tube is higher than the opening at the bottom of the outer tube, and a certain height difference is formed between the two openings. Among them, the main purpose of forming the above-mentioned height difference is to ensure that the water inlet pipe has anti-electricity function.

[0083] When the water in the inner tank drops below the opening of the outer tube, that is, when the uppermost opening of the outer tube is exposed to the water surface, the pressure inside and outside the tank is balanced, and the water below the uppermost opening of the outer tube cannot be discharged. If the remaining water in the inner tank needs to be discharged, the joint needs to be disassembled as a whole to achieve it.

[0084] The water inlet assembly of the embodiment of the present application not only has an anti-electrical function, but also facilitates the discharge of water in the tank through the drain pipe.

[0085] Please refer to Figures 1 to 11In an embodiment of the present application specification, an electric water heater is provided, which may include: a tank 1, the tank 1 having a connecting portion 10, a joint 2, the joint 2 being connected to the tank 1 through the connecting portion 10, the joint 2 having a joint through hole 201 penetrating the joint 2 body; a water inlet pipe, the water inlet pipe being installed on the joint 2; the water inlet pipe comprising an outer pipe 3 and an inner pipe 4 at least partially located in the outer pipe 3, the outer pipe 3 having an outer pipe water outlet 31, the outer pipe water outlet 31 and at least part of the outer pipe 3 being located in the tank 1, and part of the outer pipe located below the outer pipe water outlet 31 3 is connected to the joint 2, the inner tube 4 is detachably connected to the joint 2, the inner tube 4 passes through the joint through hole 201 and extends into the bile 1, the lower part of the inner tube 4 has an inner tube water inlet 41, the inner tube 4 also has an inner tube water outlet 42 located above the inner tube water inlet 41 and above the outer tube water outlet 31, water can flow into the bile 1 through the inner tube water inlet 41, the inner tube water outlet 42, and the outer tube water outlet 31 in sequence; when the inner tube 4 is removed from the joint 2, the water in the bile 1 can flow out through the outer tube water outlet 31 and the joint through hole 201.

[0086] In this embodiment, the electric water heater may include a tank 1 provided with a connecting portion 10, a joint 2 connected to the tank 1 via the connecting portion 10, a water inlet pipe installed on the tank 1 via the joint 2, and the like.

[0087] The bladder 1 may include a hollow bladder body, and the bladder 1 may be divided into a horizontal bladder and a vertical bladder according to different installation methods. Figure 1 or Figure 7 As shown, when the overall extension direction of the bladder 1 is horizontal, the bladder 1 is a horizontal bladder; or, when the overall extension direction of the bladder 1 is vertical, the bladder 1 is a vertical bladder. In the embodiments of the present application, the bladder 1 is mainly illustrated as a horizontal bladder. When the bladder 1 is in other forms, the present application can be referred to by analogy.

[0088] The number of the gallbladders 1 can be one or two. Figure 1 As shown, the electric water heater may include a tank 1; Figure 7 As shown, the electric water heater may include two tanks, namely a first tank 11 and a second tank 12. Of course, it is not excluded that the number of the tanks 1 is more than two.

[0089] The gallbladder 1 also includes a connecting portion 10, which can be arranged on the gallbladder wall of the gallbladder body for matching with the connector 2. For example, a gallbladder wall through hole 101 is opened on the gallbladder wall (for example, near the bottom or at the bottom), and the connecting portion 10 is arranged at the position of the gallbladder wall through hole 101. Of course, the connecting portion 10 can also be an opening with a connecting function. In short, any component that can function as a connecting connector 2 can be used as the connecting portion 10, and the specific form is not limited here.

[0090] like Figure 1 As shown, specifically, the connection part 10 can be in the form of a stud arranged at the position of the through hole 101 of the gallbladder wall. When the connection part 10 is in the form of a stud, the outer surface of the stud is provided with an external thread, and the upper part of the joint 2 is provided with an internal thread 22 that matches the external thread of the stud. The stud can be a stud of standard specifications, specifically, the specifications of the stud can be adapted to the size of the opening, and the present application does not make the sole limitation here.

[0091] Or, if Figure 7 As shown, the connecting portion 10 may include a flange 24, and a matching flange 24 is provided on the periphery of the joint 2. Figure 8 , Fig. 9 and Fig.10 The flange 24 of the connection part 10 is evenly arranged with multiple screw holes 25 along the circumference, and correspondingly, the flange 24 of the joint 2 is also evenly arranged with multiple screw holes 25 along the circumference. The number of the screw holes 25 can be adapted to the specification size of the flange 24, and the specific size is not limited here. Figure 8 As shown, the number of the screw holes 25 can be four. When the connecting portion 10 is assembled with the connector 2 , bolts can be inserted into the screw holes 25 for fastening.

[0092] In addition, the connecting part 10 can also cooperate with the joint 2 to form other detachable mechanisms. The specific form of the connecting part 10 is not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0093] For a double-tank electric water heater provided with two tanks (respectively, the first tank 11 and the second tank 12), the first tank 11 and the second tank 12 can be arranged up and down along the height direction, for example, the first tank 11 can be located below the second tank 12. The connecting portion 10 can be arranged on the first tank 11 located at the lower part. For a double-tank electric water heater, the aperture of the tank wall through hole 101 at the connecting portion 10 needs to be set relatively large to meet the subsequent process requirements for enameling the inner wall of the tank 1 (especially the upper second tank 12). When the aperture of the tank wall through hole 101 is large, the standard specification of the stud may not meet the demand, so the above-mentioned flange form is selected instead of the stud form to simultaneously meet the size matching requirements, as well as many requirements such as the reliability of the seal.

[0094] The connecting portion 10 has a through hole 101 that penetrates the gallbladder wall in the up-down direction. The up-down direction mainly refers to the height direction when the gallbladder 1 is in a normal installation state. The water inlet pipe and the joint 2 cooperate to form a water inlet assembly, and the water inlet assembly is connected and communicated with the gallbladder 1 through the connecting portion 10 provided with the through hole 101 in the gallbladder wall. Specifically, part of the joint 2 and the inner tube 4 can be inserted into the through hole 101 in the gallbladder wall.

[0095] The connector 2 is used as a carrier to install the water inlet pipe on the bladder 1. The connector 2 can be connected to the bladder 1 through the connecting portion 10, and the connector 2 has a connector through hole 201 that penetrates the connector 2 body in the up-down direction. The up-down direction is consistent with the direction in which the bladder wall through hole 101 of the connecting portion 10 is opened, that is, the height direction. Overall, the connector 2 can be an injection molded part, in which metal parts can be integrated at positions where the connection strength needs to be ensured. Specifically, the material and specific structure of the connector 2 can vary depending on the matching relationship and matching requirements between the components assembled with it.

[0096] The water inlet pipe is used to introduce external tap water into the bile 1. The water inlet pipe can be installed on the joint 2. The water inlet pipe can include an outer pipe 3 and an inner pipe 4 partially located in the outer pipe 3.

[0097] The outer tube 3 may be a hollow tube structure as a whole. The outer tube 3 may be made of corrosion-resistant material. The corrosion-resistant material may be a metal material, such as stainless steel. Of course, the material of the outer tube 3 is not limited to the above description. The technicians in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the protection scope of this application.

[0098] The outer tube 3 has an outer tube outlet 31, and the outer tube outlet 31 and at least a part of the outer tube 3 are located in the bile 1. The outer tube outlet 31 is used to connect the outer tube 3 with the bile 1, and the water flowing into the outer tube 3 can flow into the bile 1 through the outer tube outlet 31. The interior of the outer tube 3 is connected to the inner tube 4, and the water flowing into the inner tube 4 can flow into the outer tube 3. Figure 2 or Figure 3 As shown, specifically, the outer pipe water outlet 31 may include multiple, and the multiple outer pipe water outlets 31 may be arranged at intervals along the height direction and the circumferential direction. The shape of the outer pipe water outlet 31 may be a circular hole or a long hole, and specifically, the present application does not make specific limitations here.

[0099] The portion of the outer tube 3 below the outer tube water outlet 31 is connected to the joint 2. Specifically, the lower portion of the outer tube 3 can be connected to the joint 2 by a fixed connection or a snap connection. The lower portion of the outer tube 3 can also be connected to the joint 2 in other ways, as long as the lower portion of the outer tube 3 can be reliably mounted on the joint 2.

[0100] Among them, the fixed connection method can be welding, crimping, threaded connection and the like. Of course, the fixed connection method can also be other methods and is not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0101] The snap-fit ​​connection method can include multiple forms, such as a docking snap form, an elastic snap form, etc. Of course, the snap-fit ​​connection method can also be other methods and is not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0102] Please refer to Figure 5 and Figure 6 In one embodiment, the connector 2 is provided with a first matching portion 21, and the lower portion of the outer tube 3 is provided with a second matching portion 32, and the first matching portion 21 and the second matching portion 32 cooperate to form a fixing or clamping portion for fixing the outer tube 3 on the connector 2.

[0103] Specifically, when the outer tube 3 is engaged with the connector 2, the outer tube 3 can be installed downward along the F3 direction from top to bottom. The first matching portion 21 can include a first annular groove provided on the connector 2, or a first annular groove provided on a transition piece fixedly connected to the connector 2 or detachably connected thereto.

[0104] The first matching portion 21 may be integrally formed with the connector, or the first matching portion 21 is fixedly connected to the connector 2, or the first matching portion 21 is detachably connected to the connector 2.

[0105] In this embodiment, the first matching portion 21 can be integrally formed with the connector 2, that is, the first matching portion 21 is a part of the connector 2, and the first matching portion 21 is used to cooperate with the outer tube 3 to achieve positioning, so that other parts of the outer tube 3 do not need to be fixed (for example, no longer need to be connected and fixed with the inner tube 4), thereby simplifying the overall structure and streamlining the manufacturing process.

[0106] In addition, when the first matching portion 21 is in the form of a transition piece, it can be fixedly connected to the joint 2, for example, it can be welded on the joint 2, or the transition piece can also be detachably connected to the joint 2, for example, it can be positioned by means of threaded connection, snap connection, etc., or the transition piece can also simply contact the joint 2 without forming a relatively fixed connection relationship. When the first matching portion 21 and the joint 2 are detachably connected, the first matching portion 21 can be detached from the joint 2. Among them, the shape and structure of the transition piece provided with the first matching portion 21 can be a hollow columnar structure, and the hollow part is connected to the joint through hole 201 of the joint 2. Of course, the specific form of the transition piece is not limited to the above examples, and it can also be other forms.

[0107] The second matching portion 32 may include: a second annular groove matching the first annular groove or a plurality of recesses distributed along the circumferential direction.

[0108] Among them, taking the first matching part 21 as the first annular groove and the second matching part 32 as the second annular groove as an example, during the specific production, the outer tube 3 can be rolled at the height position corresponding to the first annular groove by rolling, so as to form a second annular groove matching the first annular groove. The above-mentioned production method by rolling is simple in process and can reliably fix the outer tube 3 on the joint 2 to achieve reliable positioning.

[0109] The first matching portion 21 and the second matching portion 32 may be located inside the bladder 1. Specifically, the first matching portion 21 and the second matching portion 32 may be located in the bladder, or in the bladder wall through hole 101. The first matching portion 21 and the second matching portion 32 are located inside the bladder 1, and can block water, ensuring that the incoming water flows into the bladder 1 through the outer tube outlet 31 as much as possible.

[0110] Specifically, the part where the joint 2 and the outer tube 3 cooperate can be a hollow cylindrical section, and at least one annular groove only needs to be provided on the outer surface of the cylindrical section. When the first matching portion 21 is located inside the bladder 1, since the joint 2 is provided outside the connecting portion 10, the first matching portion 21 is also located inside the internal thread 22 of the joint 2.

[0111] Please refer to Figure 3 and Figure 4 Furthermore, the outer tube 3 may be a blind tube with a top end 33 blocked, and the outer tube water outlet 31 is close to or located at the lower part of the outer tube 3 .

[0112] In this embodiment, when the outer tube 3 is a blind tube with a blocked top 33, water flowing from the inner tube 4 into the outer tube 3 from bottom to top will not flow directly upward from the top of the outer tube 3, but will change its flow direction under the blocking effect of the top 33 of the outer tube 3, and flow from top to bottom to the outer tube water outlet 31 before entering the bile 1.

[0113] Among them, when the outer tube water outlet 31 is close to or located at the lower part of the outer tube 3, the disturbance of the water temperature in the tank 1 caused by the water with lower temperature flowing into the tank 1 from the outer tube 3 can be reduced as much as possible, which is conducive to ensuring that the water temperature in the tank 1 maintains a stratified state that gradually increases from bottom to top, and thus can ensure that the hot water in the tank 1 that meets the predetermined water outlet temperature requirements is output to the user end reliably and efficiently.

[0114] In addition, when the outer tube water outlet 31 is close to or located at the lower part of the outer tube 3, it can be closer to the bottom of the tank 1, so that when the electric heater needs to be emptied, the water in the tank 1 can be completely emptied or nearly completely emptied.

[0115] The inner tube 4 may be a hollow tube structure as a whole. Part of the inner tube 4 may be inserted into the joint through hole 201 of the joint 2, and part of the inner tube 4 may extend upward into the outer tube 3. Figure 6 As shown, when the inner tube 4 is installed with the joint 2, it can be inserted into the joint 2 along the F4 direction from bottom to top.

[0116] In order to achieve the function of anti-electricity, the inner tube 4 can be made of insulating material, which can be plastic, such as PPR, PEX, etc. Of course, the material of the inner tube 4 is not limited to the above description, and technicians in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the protection scope of this application.

[0117] The inner tube 4 has an inner tube water inlet 41 and an inner tube water outlet 42. The inner tube water inlet 41 can be located at the lower part of the inner tube 4. For example, the lower end surface of the inner tube 4 is an open opening for forming the inner tube water inlet 41. The inner tube water outlet 42 is located above the inner tube water inlet 41 and the outer tube water outlet 31.

[0118] Specifically, the inner tube water outlet 42 is close to or located at the top of the inner tube 4. The inner tube water outlet 42 can be an open opening formed at the top of the inner tube 4; in addition, the inner tube water outlet 42 can be one or more openings opened circumferentially on the tube wall near the top of the inner tube 4. Alternatively, the inner tube water outlet 42 is a combination of the above two forms. In addition, the specific form of the inner tube water outlet 42 is not limited to the above examples. In the embodiments of the present application, the open opening formed at the top of the inner tube 4 is mainly used as an example for illustration. When the inner tube water outlet 42 is an open opening formed at the top of the inner tube 4, the structure of the inner tube 4 is the simplest as a whole, and the manufacturing cost is the lowest.

[0119] In one embodiment, a portion of the inner tube 4 located in the outer tube 3 is not in contact with the outer tube 3 , or a portion of the inner tube 4 located in the outer tube 3 is detachably connected to the outer tube 3 .

[0120] like Figure 4 As shown, for the embodiment in which the inner tube 4 and the outer tube 3 are not in contact, a spacing distance is formed between the outer surface of the inner tube 4 and the inner surface of the outer tube 3. An annular gap is formed between the outer wall of the inner tube 4 and the inner wall of the outer tube 3, and a certain distance is also formed between the top of the inner tube 4 and the top of the outer tube 3, thereby forming a certain height gap.

[0121] In the scenario where an open opening is formed at the top of the inner tube 4, the water in the inner tube 4 flows upward to the above-mentioned height gap through the inner tube water outlet 42, then enters the annular gap, and finally flows into the bile 1 through the outer tube water outlet 31. Since the inner tube 4 does not contact the outer tube 3, it can be ensured that when the bile 1 needs to be emptied, the inner tube 4 will not interfere with the outer tube 3, and the inner tube 4 can be smoothly drawn out.

[0122] Compared with some solutions that fix the top of the outer tube 3 and the inner tube 4 through a connection process, the present application can directly omit the process of fixing the outer tube 3 and the inner tube 4, that is, it simplifies the manufacturing process, has low cost, and has a simple structure.

[0123] In addition, in the embodiment of the present application, a detachable connection relationship may be formed between the inner tube 4 located in the outer tube 3 and the outer tube 3, for example, the detachable connection relationship may include a snap connection, etc. When a detachable connection relationship is formed between the outer tube 3 and the inner tube 4, the position of the detachable connection setting may be any position between the inner tube 4 and the outer tube 3 without affecting the flow of water. Specifically, the present application does not make a sole limitation here. When the inner tube 4 is detachably connected to the outer tube 3, when the bile 1 needs to be emptied, the inner tube 4 can also not interfere with the outer tube 3, and the inner tube 4 can be smoothly drawn out.

[0124] The inner tube 4 is detachably connected to the joint 2, so that the inner tube 4 can be removed from the joint 2 separately. Figure 5 As shown, in some embodiments, the lower portion of the inner tube 4 can be detachably connected to the lower portion of the connector 2. Of course, in other embodiments, when the inner tube 4 extends longer than the lower end of the connector 2, it is not excluded that the middle portion of the inner tube 4 is detachably connected to the lower portion of the connector 2.

[0125] The detachable connection between the inner tube 4 and the joint 2 can be formed by direct cooperation between the inner tube 4 and the joint 2, or can be formed by indirect cooperation through an intermediate transition piece. The specific form of the detachable connection can be a threaded connection, a clamping connection, a compression connection formed by interference fit, etc.

[0126] Wherein, the outer surface of the lower part of the joint 2 is provided with a connection structure 23, and the connection structure 23 is used to connect the water supply pipe that supplies water to the water inlet pipe. Specifically, the connection method between the outer surface of the lower part of the joint 2 and the water supply pipe is a detachable connection method. Wherein, the detachable connection method can be a threaded connection. When the outer surface of the lower part of the joint 2 is connected to the water supply pipe by a thread, the outer surface of the lower part of the joint 2 can be provided with an external thread, and the lower part of the joint 2 can include a hollow cylindrical section with an external thread on the outside. Of course, the detachable connection method is not limited to the above examples, and all connection methods that can ensure connection reliability, convenient disassembly, and low manufacturing difficulty can be used here.

[0127] In one embodiment, the lower end of the inner tube 4 extends out of the lower end of the joint through hole 201 , or the lower end of the inner tube 4 is flush with the lower end of the joint through hole 201 .

[0128] When the lower end of the inner tube 4 extends out of the lower end of the joint through hole 201 of the joint 2, or the lower end of the inner tube 4 is flush with the lower end of the joint through hole 201 of the joint 2, the operator can directly operate the lower end of the inner tube 4 to conveniently remove the inner tube 4 from the lower part of the joint 2.

[0129] In one embodiment, the electric water heater comprises a shell, the tank 1 is arranged in the shell, and the lower end of the joint 2 extends out of the shell.

[0130] For the electric water heater, a shell is also provided at the outermost part thereof. The structure of the shell may vary according to the installation environment in which it is located, the structure and distribution of the components located inside it, etc., and the present application does not make specific limitations here. Among them, the tank 1 is located in the shell. The joint 2 may be mostly located in the shell. The lower end of the joint 2 may extend out of the shell. When the lower end of the joint 2 extends out of the shell, the lower end of the inner tube 4 also extends out of the shell, so that without disassembling the shell, after removing the joint 2 and the external water supply pipe, the inner tube 4 can be removed from the lower end of the joint 2. When the inner tube 4 is removed from the joint 2, the water in the inner tank 1 that enters the outer tube 3 through the outer tube outlet 31 can be directly discharged outward through the joint through hole 201 of the joint 2, thereby achieving efficient emptying.

[0131] In one embodiment, the inner tube 4 is spaced apart from the joint through hole 201 , and the inner tube 4 is sealed and matched with the joint 2 .

[0132] The inner tube 4 is inserted into the joint through hole 201 of the joint 2, and there is a certain gap between the outer surface of the inner tube 4 and the inner surface of the joint through hole 201. The inner tube 4 and the joint 2 can seal the gap by directly matching or setting a seal 5 to prevent water in the gallbladder 1 from flowing out through the gap, and the inner tube 4 and the joint 2 can be detachably connected.

[0133] Specifically, the inner tube 4 can be sealed with the joint through hole 201, or the inner tube 4 can also be sealed with the main body of the joint 2. When the inner tube 4 is sealed with the joint through hole 201, a seal 5 is provided between the outer surface of the inner tube 4 and the inner surface of the joint through hole 201, or a first matching portion 21 is provided on the outer surface of the inner tube 4, and a second matching portion 32 is provided on the inner surface of the joint 2, and the first matching portion 21 and the second matching portion 32 form a sealing structure. When the inner tube 4 is sealed with the main body of the joint 2, a seal 5 can be provided between the outer surface of the inner tube 4 and the end face of the joint 2, so as to seal the gap between the outer surface of the inner tube 4 and the joint through hole 201.

[0134] In a specific embodiment, when a sealing structure is formed by the first matching portion 21 and the second matching portion 32, the first matching portion 21 and the second matching portion 32 can be a trapezoidal external thread and a trapezoidal internal thread, respectively. Specifically, the outer surface of the inner tube 4 can be provided with a trapezoidal external thread, and the inner surface where the joint through hole 201 is located can be provided with a trapezoidal internal thread. When the trapezoidal external thread and the trapezoidal internal thread are matched, the inner tube 4 can be sealed with the joint through hole 201 of the joint 2. Of course, the way to form a sealing structure between the inner tube 4 and the joint through hole 201 is not limited to the above examples, such as tapered threads. Technicians in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0135] Alternatively, in another specific embodiment, a seal 5 may be provided between the inner tube 4 and the joint through hole 201, and the seal 5 may be provided in the annular gap between the inner tube 4 and the joint through hole 201 of the joint 2 by interference fit, or the seal 5 may be provided between the periphery of the inner tube 4 and the lower end surface of the joint 2, or the seal 5 may be provided at both of the above positions. The overall structure, size, etc. of the seal 5 may be adapted to the structure of the annular gap, for example, when the annular gap is circular, the seal 5 may be in the shape of a circular ring.

[0136] In one embodiment, the lower portion of the inner tube 4 and the lower portion of the joint 2 are sealed together via a seal 5 .

[0137] When the lower part of the inner tube 4 is sealed with the lower part of the joint 2 through the seal 5, the two can not only achieve a detachable connection but also achieve a seal between the joint 2 and the inner tube 4 by directly setting the seal 5, thereby preventing water in the bile 1 from flowing out through the gap between the joint 2 and the inner tube 4.

[0138] The seal 5 may be disposed in the annular gap between the tube wall of the inner tube 4 and the joint through hole 201 of the joint 2 , or may be extended downward, for example, to the lower end surface of the joint 2 .

[0139] Specifically, the lower end of the seal 5 extends out of the lower end of the inner tube 4 or is flush with the lower end of the inner tube 4; and / or, the lower end of the inner tube 4 extends out of the lower end of the joint through hole 201 or is flush with the lower end of the joint through hole 201.

[0140] In this embodiment, the relative positional relationship among the seal 5, the inner tube 4 and the joint 2 can be combined according to actual requirements of assembly and sealing.

[0141] When the seal 5 is at least located between the inner tube 4 and the joint through hole 201 of the joint 2, the seal 5 may include a first seal portion 51, which is sleeved on the outer surface of the inner tube 4 and located between the inner surface of the joint through hole 201 and the outer surface of the inner tube 4, thereby blocking the gap between the inner tube 4 and the joint 2 to prevent the water in the gallbladder 1 from flowing out through the gap between the two. Specifically, the shape and structure of the first seal portion 51 may be adapted to the annular gap between the inner tube 4 and the joint 2.

[0142] Furthermore, the seal 5 may also include a second sealing portion 52, which at least partially covers at least a portion of the lower end surface of the joint 2 and extends out of the lower end of the inner tube 4, and is used to seal the gap between the water supply pipe and at least a portion of the lower end surface when the water supply pipe is connected to the joint 2.

[0143] The sealing member 5 may further include a second sealing portion 52, which may be a radial protrusion formed by extending radially outward and downward from the lower end of the first sealing portion 51. Figure 5 As shown, the lower end of the seal 5 extends out of the lower end of the inner tube 4, and the lower end of the inner tube 4 extends out of the lower end of the joint through hole 201. The seal 5 as a whole is sealed between the inner tube 4 and the joint through hole 201 of the joint 2 and the lower end surface of the joint 2.

[0144] Specifically, when the joint 2 is connected to the water supply pipe at the lower part, the joint 2 can be used to apply an axial compression force to the second sealing portion 52, so that the second sealing portion 52 is pressed against the lower end surface of the joint 2, thereby sealing the gap between the water supply pipe and at least part of the lower end surface, so as to further improve the reliability of the seal.

[0145] like Figure 5 As shown, in one embodiment, the lower portion of the inner tube 4 has a limiting step portion 43 , and the limiting step portion 43 is used to limit the first sealing portion 51 .

[0146] In this embodiment, a limiting step portion 43 may be formed at the lower portion of the inner tube 4, and the limiting step portion 43 may specifically be a radial protrusion formed at the lower end of the inner tube 4, and the radial protrusion may be an annular protrusion, or may be a plurality of discontinuous protrusions spaced apart in the circumferential direction, etc. When the inner tube 4 is matched with the sealing member 5, the limiting step portion 43 of the inner tube 4 can exert a force on the first sealing portion 51 along the axial direction of the inner tube 4 toward the gallbladder wall, thereby limiting the position of the first sealing portion 51.

[0147] Specifically, the limiting step portion 43 can abut against the end of the first sealing portion 51, or the limiting step portion 43 can abut against the junction of the first sealing portion 51 and the second sealing portion 52, or a groove is provided on the first sealing portion 51, and the limiting step portion 43 can be provided in the groove of the first sealing portion 51.

[0148] In addition, in order to efficiently install the seal 5 in place, a guide portion 511 may be provided at the upper end of the first seal portion 51. Specifically, the guide portion 511 may be a reduced diameter section formed at the upper portion of the first seal portion 51, and the outer diameter of the reduced diameter section is smaller than the outer diameter of the first seal portion 51. During installation, the seal 5 and the inner tube 4 may be assembled together and then inserted into the joint 2 together. When the inner tube 4 is installed to the position where the seal 5 and the joint 2 are about to contact, due to the provision of the guide portion 511, the seal 5 may be smoothly introduced into the annular gap between the joint 2 and the inner tube 4, thereby achieving efficient positioning and installation.

[0149] In the embodiment of the present application, in the case where the upper end of the joint 2 extends into the gallbladder 1, the inner tube 4 can extend into the gallbladder 1 through the joint through hole 201 of the joint 2. In addition, in the case where the upper end of the joint 2 is located in the gallbladder wall through hole 101, the inner tube 4 can extend into the gallbladder 1 through the joint through hole 201 of the joint 2 and the gallbladder wall through hole 101 of the connecting portion 10. Of course, in some other cases, when the relative positional relationship between the joint 2 and the connecting portion 10 is changed, the case where the inner tube 4 directly extends into the gallbladder 1 through the gallbladder wall through hole 101 is not excluded.

[0150] The electric water heater provided in the embodiment of the present application may include a working state and an emptying state. In the working state, the electric water heater Figure 4 As shown, when external tap water is supplied into the bile 1 through the water inlet pipe, the water can sequentially pass through the inner tube water inlet 41, flow through the inner tube 4 from bottom to top, flow into the outer tube 3 from the inner tube water outlet 42, and then flow from top to bottom to the outer tube water outlet 31 before flowing into the interior of the bile 1, thereby replenishing water into the bile 1.

[0151] like Fig.11As shown, in the emptying state, the electric water heater can first disassemble the joint 2 and the water supply pipe, and then remove the inner tube 4 from the lower part of the joint 2 from top to bottom. After the inner tube 4 is removed from the lower part of the joint 2, the water in the tank 1 can flow out through the outer tube water outlet 31 and the joint through hole 201, so that the emptying can be achieved efficiently and thoroughly. On the whole, the emptying path is short, the emptying resistance is small, and the emptying efficiency is high; and when emptying, the water at the lowest position of the outer tube water outlet 31 can be discharged outwardly. Generally, the lowest position of the outer tube water outlet 31 is close to the bottom of the tank 1. Therefore, the electric water heater in the embodiment of the present application can effectively empty the water in the tank 1 outwardly in the emptying state.

[0152] The electric water heater provided in the embodiment of the present application can form a new emptying method by optimizing and improving the structure of the water inlet component with anti-electricity function. When emptying is required, efficient emptying can be achieved by only pulling out the inner tube 4 from the tank 1. There is no need to disassemble the outer shell of the electric water heater, the joint 2 connected to the water inlet pipe and other components. The operation is simple, the workload and work intensity are low, and even if the emptying is performed frequently, the sealing and reliability of the matching position of the tank 1 will not be affected.

[0153] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0154] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0155] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. An electric water heater, characterized in that: The electric water heater comprises: A gallbladder having a connecting portion; A connector, the connector being connected to the gallbladder through the connecting portion, and the connector having a connector through hole penetrating the connector body; A water inlet pipe, the water inlet pipe is installed on the joint; The water inlet pipe comprises an outer pipe and an inner pipe at least partially located in the outer pipe, The outer tube has an outer tube water outlet, the outer tube water outlet and at least a portion of the outer tube are located in the bile, and a portion of the outer tube located below the outer tube water outlet is connected to the joint. The inner tube is detachably connected to the joint, the inner tube passes through the joint through hole and extends into the bile, the lower part of the inner tube is provided with an inner tube water inlet, the inner tube also has an inner tube water outlet located above the inner tube water inlet and above the outer tube water outlet, water can flow into the bile through the inner tube water inlet, the inner tube water outlet and the outer tube water outlet in sequence, when the inner tube is removed from the joint, the water in the bile can flow out through the outer tube water outlet and the joint through hole.

2. The electric water heater according to claim 1, characterized in that: The lower end of the inner tube extends out of the lower end of the joint through hole, or the lower end of the inner tube is flush with the lower end of the joint through hole.

3. The electric water heater according to claim 2, characterized in that: The electric water heater comprises a shell, the tank is arranged in the shell, and the lower end of the joint extends out of the shell.

4. The electric water heater according to claim 1, characterized in that: The inner tube and the joint through hole are arranged at intervals, and the inner tube and the joint are sealed and matched.

5. The electric water heater according to claim 4, characterized in that: The inner tube is sealed and matched with the joint through hole.

6. The electric water heater according to claim 5, characterized in that: A seal is provided between the outer surface of the inner tube and the inner surface of the joint through hole, or a first mating portion is provided on the outer surface of the inner tube and a second mating portion is provided on the inner surface of the joint, and the first mating portion and the second mating portion form a sealing structure.

7. The electric water heater according to claim 1, characterized in that: The lower part of the inner tube is detachably connected to the lower part of the joint.

8. The electric water heater according to claim 7, characterized in that: The lower part of the inner tube and the lower part of the joint are sealed together through a sealing member.

9. The electric water heater according to claim 8, characterized in that: The lower end of the sealing member extends out of the lower end of the inner tube or is flush with the lower end of the inner tube; and / or the lower end of the inner tube extends out of the lower end of the joint through hole or is flush with the lower end of the joint through hole.

10. The electric water heater according to claim 8, characterized in that: The sealing member comprises a first sealing portion, which is sleeved on the outer surface of the inner tube and located between the inner surface of the joint through hole and the outer surface of the inner tube.

11. The electric water heater according to claim 10, characterized in that: The joint is used to connect a water supply pipe that supplies water to the water inlet pipe. The seal also includes a second sealing portion, which at least partially covers at least a portion of the lower end surface of the joint and extends out of the lower end of the inner tube. When the water supply pipe is connected to the joint, the second sealing portion is used to seal the gap between the water supply pipe and at least a portion of the lower end surface of the joint.

12. The electric water heater according to claim 10, characterized in that: The lower portion of the inner tube has a limiting step portion, and the limiting step portion is located below the first sealing portion and is used to limit the first sealing portion.

13. The electric water heater according to claim 10, characterized in that: The first sealing portion has a guide portion, and the guide portion is located at an upper end of the first sealing portion.

14. The electric water heater according to claim 7, characterized in that: The outer surface of the lower part of the joint is provided with a connection structure, and the connection structure is used to connect a water supply pipe that supplies water to the water inlet pipe.

15. The electric water heater according to claim 1, characterized in that: The outer tube is a blind tube with its top blocked, the water outlet of the outer tube is close to or located at the lower part of the outer tube, and the water outlet of the inner tube is close to or located at the top of the inner tube.

16. The electric water heater according to claim 15, characterized in that: The portion of the inner tube located in the outer tube does not contact the outer tube, or the portion of the inner tube located in the outer tube is detachably connected to the outer tube.

17. The electric water heater according to claim 1, characterized in that: The lower part of the outer tube is connected to the joint by a fixed connection or a snap connection.

18. The electric water heater according to claim 17, characterized in that: The joint is provided with a first matching portion, and the lower part of the outer tube is provided with a second matching portion, and the first matching portion and the second matching portion cooperate to fix or clamp the outer tube on the joint.

19. The electric water heater according to claim 18, characterized in that: The first matching portion is integrally formed with the connector, or the first matching portion is fixedly connected to the connector, or the first matching portion is detachably connected to the connector.

20. The electric water heater according to claim 18, characterized in that: The first matching portion includes a first annular groove, and the second matching portion includes a second annular groove matching the first annular groove or a plurality of pits distributed along the circumferential direction.

21. The electric water heater according to claim 20, characterized in that: The first matching portion and the second matching portion are located in the bladder.

22. The electric water heater according to claim 21, characterized in that: The connecting portion comprises a stud, an outer surface of the stud is provided with an external thread, an upper portion of the joint is provided with an internal thread matching the external thread of the stud, and the first matching portion is located on the inner side of the internal thread.

23. The electric water heater according to claim 1, characterized in that: The connecting part comprises a flange, and the outer periphery of the joint is provided with a flange matched with the connecting part.

24. The electric water heater according to claim 23, characterized in that: The electric water heater is a double-tank electric water heater, comprising: a first tank and a second tank that are connected, the first tank is located below the second tank, and the flange for forming the connecting portion is located on the first tank.

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