Electric water heater

Abstract

The utility model relates to the technical field of electric water heaters, and particularly discloses an electric water heater which comprises a container, a water inlet pipe, a water outlet pipe, a water outlet pipe and a water outlet pipe. The container comprises an upper container and a lower container, and the upper container is located above the lower container which is communicated with the upper container through a communication part; the water inlet pipe is used for supplying water to the container; the heating piece is used for heating water in the container; the drainage pipe is located in the container and connected with the container and / or the communicating part and / or the water inlet pipe, the drainage pipe is provided with a water outlet part and a water inlet part arranged on the peripheral wall of the drainage pipe, and the water outlet part is located above the water inlet part; water in the communicating part and / or water in the lower container can enter the drainage pipe through the water inlet part and flow to the upper container from the water outlet part. According to the scheme, the heat exchange efficiency between the upper container and the lower container of the electric water heater can be improved, and the production cost is effectively reduced.

Description

Technical Field

[0001] This specification relates to the technical field of electric water heaters, and particularly to an electric water heater. Background Art

[0002] The current double-tank water heaters are usually of a splicing structure of two inner tanks. Since each inner tank needs to be provided with an independent heating unit and safety protection unit, the cost is relatively high.

[0003] In the prior art, a convection enhancement structure is provided in the electric water heater to improve the heat exchange efficiency between the two inner tanks. The convection enhancement structure includes a first diversion pipe at least partially located in the second inner tank. The electric water heater further includes a water inlet pipe provided on the first inner tank, and the water inlet pipe further has an extension pipe that can extend into and communicate with a first channel between the first inner tank and the second inner tank. The first diversion pipe is sleeved on the extension pipe, and both ends of the first diversion pipe are spot-welded to the outer wall of the extension pipe. However, the above solution in the prior art requires spot-welding an additional first diversion pipe on the extension pipe, the process is relatively complex, and the manufacturing cost is relatively high. Moreover, in the prior art, in order to make the axis of the first diversion pipe coincide with the axis of the first channel, the extension pipe needs to be bent, so the structure is relatively complex, the manufacturing process is complex, and the manufacturing cost is relatively high.

[0004] In view of the above problems, no effective solution has been proposed yet. Utility Model Content

[0005] Embodiments of this specification provide an electric water heater to solve the problem of relatively high cost of double-tank water heaters in the prior art.

[0006] Embodiments of this specification provide an electric water heater, including:

[0007] A tank, the tank includes an upper tank and a lower tank, the upper tank is located above the lower tank, and the lower tank is connected to the upper tank through a communication part;

[0008] A water inlet pipe, the water inlet pipe is used to supply water to the tank;

[0009] A heating element, used to heat the water in the tank;

[0010] A drainage pipe, the drainage pipe is located in the tank and is connected to the tank and / or the communication part and / or the water inlet pipe, the drainage pipe has a water outlet part and a water inlet part provided on the peripheral wall of the drainage pipe, the water outlet part is located above the water inlet part, and the water in the communication part and / or the water in the lower tank can enter the drainage pipe through the water inlet part and flow from the water outlet part to the upper tank.

[0011] In one embodiment, the water inlet part is located in the communication part or the lower tank, and / or,

[0012] The water outlet part is located in the upper tank.

[0013] In one embodiment, the water inlet part is a water inlet hole provided on the peripheral wall of the drainage pipe; and / or,

[0014] The water outlet part is an open end provided at the top of the drainage pipe or a water outlet hole provided on the peripheral wall of the drainage pipe.

[0015] In one embodiment, the water inlet hole and / or the water outlet hole is a round hole, a square hole or an oval hole.

[0016] In one embodiment, the drainage pipe is connected to the water inlet pipe;

[0017] The drainage pipe and the water inlet pipe are separated by a partition at the connection position.

[0018] In one embodiment, the bottom of the drainage pipe is connected to the top of the water inlet pipe;

[0019] The partition is the bottom of the drainage pipe, and / or, the partition is the top of the water inlet pipe.

[0020] In one embodiment, the drainage pipe and the water inlet pipe are an integrally formed same pipe body;

[0021] The partition is provided inside the pipe body; the part of the pipe body above the partition is the drainage pipe, and the part of the pipe body below the partition is the water inlet pipe.

[0022] In one embodiment, the axis of the drainage pipe coincides with the axis of the water inlet pipe.

[0023] In one embodiment, the water inlet pipe is a non-bent straight pipe.

[0024] In one embodiment, the partition is connected to the inner surface of the drainage pipe and / or the water inlet pipe, or, the partition is limited by a limiting member on the inner surface of the drainage pipe and / or the water inlet pipe.

[0025] In one embodiment, the partition is connected to the inner surface of the drainage pipe and / or the water inlet pipe by a welding process; or,

[0026] The limiting member is a groove provided on the pipe wall of the drainage pipe and / or the water inlet pipe and extending towards the inside of the pipe.

[0027] In one embodiment, an exhaust hole is provided at the lower part or the bottom of the drainage pipe, and the exhaust hole is located between the partition and the water inlet part.

[0028] In one embodiment, the water inlet pipe includes an outer pipe and an inner pipe, and the inner pipe is located inside the outer pipe;

[0029] The outer pipe has an outer pipe water outlet, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet;

[0030] The outer pipe is connected to the drainage pipe, or the outer pipe and the drainage pipe are integrally formed.

[0031] In one embodiment, the lower tank has a connecting portion;

[0032] The electric water heater further includes a connector. The connector is connected to the lower tank through the connecting portion. The connector has a connector through hole penetrating the connector body;

[0033] The water inlet pipe is installed on the connector;

[0034] The water inlet pipe includes an outer pipe and an inner pipe at least partially located in the outer pipe,

[0035] The outer pipe has an outer pipe water outlet. The outer pipe water outlet and at least part of the outer pipe are located in the lower tank. The part of the outer pipe below the outer pipe water outlet is connected to the connector,

[0036] The inner pipe is detachably connected to the connector. The inner pipe passes through the connector through hole and extends into the lower tank. The lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet. When the inner pipe is removed from the connector, the water in the tank can flow out through the outer pipe water outlet and the connector through hole;

[0037] The outer pipe is connected to the drainage pipe, or the outer pipe and the drainage pipe are integrally formed.

[0038] In one embodiment, the lower end of the inner pipe extends out of the lower end of the connector through hole, or the lower end of the inner pipe is flush with the lower end of the connector through hole.

[0039] In one embodiment, the electric water heater includes a housing, the lower tank is arranged inside the housing, and the lower end of the connector extends out of the housing.

[0040] In one embodiment, the lower part of the inner pipe is detachably connected to the lower part of the connector.

[0041] In one embodiment, the inner tube is spaced apart from the through hole of the joint, and the inner tube is in sealed cooperation with the joint.

[0042] In one embodiment, the diameter of the water inlet pipe is the same as that of the drainage pipe, or,

[0043] the diameter of the drainage pipe is greater than that of the water inlet pipe.

[0044] An embodiment of the present specification provides an electric water heater, including:

[0045] A tank, the tank includes an upper tank and a lower tank, the upper tank is located above the lower tank, and the lower tank is connected to the upper tank through a communication part;

[0046] A water inlet pipe for supplying water to the tank;

[0047] A heating element for heating the water in the tank;

[0048] A drainage pipe located in the tank and a part of the bottom of the drainage pipe is connected to the top of the water inlet pipe; the drainage pipe and the water inlet pipe are separated by a partition at the connection position, the partition is a part of the bottom of the drainage pipe, and / or the partition is the top of the water inlet pipe; the drainage pipe has a water outlet part and a water inlet part provided on the bottom of another part of the drainage pipe, the water outlet part is located above the water inlet part, and the water in the communication part and / or the water in the lower tank can enter the drainage pipe through the water inlet part and flow from the water outlet part to the upper tank.

[0049] In one embodiment, the water inlet part is located in the communication part or the lower tank, and / or,

[0050] the water outlet part is located in the upper tank.

[0051] In one embodiment, the water inlet part is a water inlet hole provided on the bottom of another part of the drainage pipe; and / or,

[0052] the water outlet part is an opening provided at the top of the drainage pipe or a water outlet hole provided on the peripheral wall of the drainage pipe.

[0053] In one embodiment, the water inlet hole and / or the water outlet hole is a round hole, a square hole or an oval hole.

[0054] In one embodiment, the drainage pipe and the water inlet pipe are an integrally formed same pipe body;

[0055] The partition is arranged in the pipe body; the part of the pipe body above the partition is the drainage pipe, and the part of the pipe body below the partition is the water inlet pipe.

[0056] In one embodiment, the axis of the drain pipe coincides with the axis of the water inlet pipe.

[0057] In one embodiment, the water inlet pipe is a non-bent straight pipe.

[0058] In one embodiment, the partition portion is connected to the inner surface and / or end surface of the drain pipe and / or the water inlet pipe.

[0059] In one embodiment, the partition portion is connected to the inner surface and / or end surface of the drain pipe and / or the water inlet pipe by a welding process.

[0060] In one embodiment, the water inlet pipe includes an outer pipe and an inner pipe, and the inner pipe is located inside the outer pipe;

[0061] The outer pipe has an outer pipe water outlet, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet;

[0062] The outer pipe is connected to the drain pipe, or the outer pipe and the drain pipe are integrally formed.

[0063] In one embodiment, the lower tank has a connecting portion;

[0064] The electric water heater further includes a connector, the connector is connected to the lower tank through the connecting portion, and the connector has a connector through hole penetrating the connector body;

[0065] The water inlet pipe is installed on the connector;

[0066] The water inlet pipe includes an outer pipe and an inner pipe at least partially located in the outer pipe;

[0067] The outer pipe has an outer pipe water outlet, the outer pipe water outlet and at least a part of the outer pipe are located in the lower tank, and a part of the outer pipe below the outer pipe water outlet is connected to the connector;

[0068] The inner pipe is detachably connected to the connector, the inner pipe passes through the connector through hole and extends into the lower tank, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet. When the inner pipe is removed from the connector, the water in the tank can flow out through the outer pipe water outlet and the connector through hole.

[0069] In one embodiment, the diameter of the drainage pipe is greater than the diameter of the water inlet pipe.

[0070] The technical solution of this specification has the following remarkable beneficial effects:

[0071] By arranging a drainage pipe in the water tank of the electric water heater, the water in the communication part and / or the water in the lower water tank can flow into the drainage pipe through the water inlet part on the peripheral wall of the drainage pipe, and then flow from the water outlet part of the drainage pipe to the upper water tank, which can improve the convective heat transfer efficiency between the water in the lower water tank and the water in the upper water tank, so that only by arranging a heating element in the upper water tank or the lower water tank, the heating of the water in the upper water tank and the lower water tank can be realized, and the production cost can be effectively reduced. In addition, by arranging the drainage pipe to be connected to the water tank, the communication part and / or the water inlet pipe, the drainage pipe can be fixed in the water tank, and the structure is simple and flexible. Further, by arranging a water inlet part on the peripheral wall of the drainage pipe, it is convenient for the water in the lower water tank or the communication part to flow into the drainage pipe. Moreover, compared with the prior art that an additional first diversion pipe needs to be spot-welded on the extension pipe, in some embodiments of the present application, the water inlet pipe can be connected to or integrally formed with the drainage pipe, and the drainage pipe can be regarded as an extension of the water inlet pipe. In this way, only by arranging a water inlet part on the peripheral wall of the drainage pipe, the convective heat transfer efficiency between the water in the lower water tank and the water in the upper water tank can be improved, and there is no need to additionally arrange a first diversion pipe, and the structure and process are relatively simple, and the cost can be further reduced.

[0072] Referring to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments.

[0073] It should be emphasized that the term "comprising / including" when used herein refers to the presence of features, components, steps or assemblies, but does not exclude the presence or addition of one or more other features, components, steps or assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, and do not specifically limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention. In the drawings:

[0075] Figure 1Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0076] Figure 2 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0077] Figure 3 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0078] Figure 4 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0079] Figure 5 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0080] Figure 6 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0081] Figure 7 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0082] Figure 8 Shows a schematic structural diagram of a water inlet pipe and a drainage pipe in an embodiment of this specification;

[0083] Figure 9 Shows a schematic structural diagram of a water inlet pipe and a drainage pipe in an embodiment of this specification;

[0084] Figure 10 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0085] Figure 11 Shows a schematic structural diagram of an electric water heater in an embodiment of this specification;

[0086] Figure 12 Shows a schematic structural diagram of the bottom of the drainage pipe in an embodiment of this specification.

[0087] Reference numerals of the above drawings:

[0088] 1. Electric water heater; 10. Liner; 101. Upper liner; 102. Lower liner; 103. Connecting part; 11. Water inlet pipe; 111. Outer pipe; 1111. Outer pipe water outlet; 112. Inner pipe; 1121. Inner pipe water inlet; 1122. Inner pipe water outlet; 12. Heating element; 13. Drainage pipe; 131. Water outlet part; 132. Water inlet part; 133. Exhaust hole; 135. One part of the bottom; 136. Another part of the bottom; 14. Partition part; 15. Joint; 16. Housing. Detailed implementation manners

[0089] The principles and spirit of this specification will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and then implement this specification, rather than limiting the scope of this specification in any way. On the contrary, these embodiments are provided to make the disclosure of this specification more thorough and complete, and to convey the scope of this disclosure fully to those skilled in the art.

[0090] Combined with the description of the accompanying drawings and the specific embodiments of the present utility model, the details of the present utility model can be understood more clearly. However, the specific embodiments of the present utility model described herein are only for the purpose of explaining the present utility model and cannot be understood in any way as a limitation of the present utility model. Under the teaching of the present utility model, those skilled in the art can conceive any possible variations based on the present utility model, and these should all be regarded as belonging to the scope of the present utility model. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0091] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this specification belongs. The terms used herein in this specification are only for the purpose of describing specific embodiments and are not intended to limit this specification. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0092] An embodiment of this specification provides an electric water heater. Please refer to Figures 1 to 6 , which shows a schematic structural diagram of the electric water heater in the embodiment of this specification. As Figures 1 to 6 shown, the electric water heater 1 may include: a tank 10, a water inlet pipe 11, a heating element 12, and a drainage pipe 13. The tank 10 may include an upper tank 101 and a lower tank 102. The upper tank 101 and the lower tank 102 may include a hollow tank body. The upper tank 101 is located above the lower tank 102. The lower tank 102 is connected to the upper tank 101 through a communication part 103. The upper tank 101 and the lower tank 102 may be horizontally placed inner tanks 10, that is, the horizontal length of the tank is greater than the height of the tank.

[0093] In one embodiment, a first communication port is provided on the upper tank 101, a second communication port is provided on the lower tank 102, and the communication part 103 is used to connect the first communication port and the second communication port. The upper end of the communication pipe can be hermetically connected to the edge of the first communication port, the lower end of the communication pipe can be hermetically connected to the edge of the second communication port, and a through hole can be provided on the communication part 103 to connect the upper tank 101 and the lower tank 102.

[0094] The water inlet pipe 11 is used to supply water to the tank 10. The water inlet pipe 11 can be used to supply water to the upper tank 101 and / or the lower tank 102. The water inlet pipe 11 provides the water flowing out from the external water source to the tank 10.

[0095] The electric water heater 1 can include at least one heating element 12. The heating element 12 can be provided in the upper tank 101, or can be provided in the lower tank 102, or can be provided in both the upper tank 101 and the lower tank 102 at the same time. This application does not limit this.

[0096] As Figures 1 to 6 shown, the drainage pipe 13 can be located in the tank 10. The drainage pipe 13 can be connected to the tank 10 and / or the communication part 103 and / or the water inlet pipe 11. As Figure 1 and Figure 2 shown, the drainage pipe 13 can be connected to the communication part 103. In one embodiment, the drainage pipe 13 can be connected to the inner surface of the through hole in the communication part 103. As Figure 3 shown, the drainage pipe 13 can be connected to the inner surface of the upper part of the upper tank 101. As Figures 4 to 6 shown, the drainage pipe 13 can be connected to the water inlet pipe 11. In one embodiment, the drainage pipe 13 can be connected to the tank 10 and / or the communication part 103 and / or the water inlet pipe 11 by a welding process.

[0097] As Figures 1 to 6 shown, the drainage pipe 13 can have a water outlet part 131 and a water inlet part 132 provided on the peripheral wall of the drainage pipe 13. The water outlet part 131 is located above the water inlet part 132, so that the water in the communication part 103 and / or the water in the lower tank 102 can enter the drainage pipe 13 through the water inlet part 132 and flow from the water outlet part 131 to the upper tank 101.

[0098] In the above embodiments, by providing a drainage pipe 13 in the tank 10 of the electric water heater 1, the water in the communication part 103 and / or the water in the lower tank 102 can flow into the drainage pipe 13 through the water inlet part 132 on the peripheral wall of the drainage pipe 13, and flow from the water outlet part 131 of the drainage pipe 13 to the upper tank 101. This can improve the convective heat transfer efficiency between the water in the lower tank 102 and the water in the upper tank 101, such that only by providing a heating element 12 in the upper tank 101 or the lower tank 102, the heating of the water in both the upper tank 101 and the lower tank 102 can be achieved, effectively reducing the production cost. In addition, by arranging the drainage pipe 13 to be connected to the tank 10, the communication part 103 and / or the water inlet pipe 11, the drainage pipe 13 can be fixed within the tank 10, with a simple and flexible structure. Further, by providing the water inlet part 132 on the pipe wall of the drainage pipe 13, it is convenient for the water in the lower tank 102 or the communication part 103 to flow into the drainage pipe 13. Moreover, compared with the prior art where an additional first diversion pipe needs to be spot-welded on the extension pipe, in some embodiments of the present application, the water inlet pipe 11 can be connected to or integrally formed with the drainage pipe 13. The drainage pipe 13 can be regarded as an extension of the water inlet pipe 11. Only by providing the water inlet part 132 on the peripheral wall of the drainage pipe 13, the convective heat transfer efficiency between the water in the lower tank 102 and the water in the upper tank 101 can be improved, without the need to additionally provide a first diversion pipe, and the structure and process are relatively simple, which can further reduce the cost.

[0099] In some embodiments of this specification, the water inlet part 132 on the drainage pipe 13 can be provided on the part of the drainage pipe 13 located in the communication part 103 and / or the lower tank 102. By providing the water inlet part 132 in the lower tank 102 and / or the communication part 103, it is convenient for the water in the lower tank 102 and / or the communication part 103 to enter the drainage pipe 13 from the water inlet part 132.

[0100] As Figure 1 、 Figure 2 and Figure 4 shown, the water inlet part 132 on the drainage pipe 13 can be provided in the lower tank 102.

[0101] As Figure 3 、 Figure 5 and Figure 6 shown, the water inlet part 132 on the drainage pipe 13 can be provided in the communication part 103 and the lower tank 102.

[0102] In some embodiments of this specification, the water outlet part 131 can be provided on the part of the drainage pipe 13 located in the communication part 103 and / or the upper tank 101.

[0103] As Figure 2 shown, the water outlet part 131 can be provided in the communication part 103.

[0104] As Figure 1 andFigures 3 to 6 As shown, the water outlet part 131 can be arranged in the upper tank 101. By arranging the water inlet part 132 in the upper tank 101, it is convenient for the water in the drainage pipe 13 to flow from the water outlet part 131 to the upper tank 101.

[0105] As Figure 4 shown, in some embodiments of this specification, the water inlet part 132 is located in the communication part 103 or the lower tank 102, and the water outlet part 131 is located in the upper tank 101. By arranging the water inlet part 132 in the lower tank 102 and the water outlet part 131 in the upper tank 101, it is convenient for the water in the lower tank 102 and / or the communication part 103 to enter the drainage pipe 13 from the water inlet part 132 and then flow from the water outlet part 131 to the upper tank 101.

[0106] As Figures 1 to 6 shown, in some embodiments of this specification, the water inlet part 132 is a water inlet hole arranged on the peripheral wall of the drainage pipe 13. The water in the lower tank 102 and / or the communication part 103 can enter the drainage pipe 13 through the water inlet hole on the peripheral wall of the drainage pipe 13.

[0107] As Figure 3 shown, in some embodiments of this specification, the water inlet part 132 of the drainage pipe 13 may further include an open end at the lower end of the drainage pipe 13. By using the water inlet hole on the peripheral wall of the drainage pipe 13 and the open end at the lower end as the water inlet part 132, the water flow rate flowing into the drainage pipe 13 can be increased, and thus the heat exchange efficiency between the upper tank 101 and the lower tank 102 can be improved.

[0108] In some embodiments of this specification, the water outlet part 131 is an open end arranged at the top of the drainage pipe 13 or a water outlet hole arranged on the peripheral wall of the drainage pipe 13. As Figure 1 , Figure 2 and Figure 4 shown, the water outlet part 131 is an open end arranged at the top of the drainage pipe 13. As Figure 3 shown, the water outlet part 131 is a water outlet hole arranged on the peripheral wall of the drainage pipe 13. As Figure 5 and Figure 6 shown, the water outlet part 131 includes an open end arranged at the top of the drainage pipe 13 and a water outlet hole arranged on the peripheral wall of the drainage pipe 13.

[0109] In some embodiments of this specification, the water inlet hole and / or the water outlet hole are round holes, square holes or oval holes. As Figures 1 to 6 shown, the water inlet hole and / or the water outlet hole can be round holes or oval holes. Of course, in other embodiments, the water inlet hole and / or the water outlet hole can also be square holes or holes of other shapes.

[0110] As Figures 4 to 6As shown, in some embodiments of this specification, the drain pipe 13 is connected to the water inlet pipe 11. In one embodiment, the drain pipe 13 can be connected to the water inlet pipe 11 by welding process or other means.

[0111] The drain pipe 13 and the water inlet pipe 11 are separated by a separating portion 14 at the connection position. The drain pipe 13 and the water inlet pipe 11 can be separated by the separating portion 14 at the connection position. The separating portion 14 is used to prevent the water in the water inlet pipe 11 from directly entering the drain pipe 13, thereby avoiding the water in the water inlet pipe 11 directly entering the drain pipe 13 and affecting the heat exchange efficiency.

[0112] As Figures 4 to 6 shown, in some embodiments of this specification, the bottom of the drain pipe 13 is connected to the top of the water inlet pipe 11. The drain pipe 13 is located above the water inlet pipe 11. By connecting the bottom of the drain pipe 13 to the top of the water inlet pipe 11, the drain pipe 13 and the water inlet pipe 11 can be connected.

[0113] In one embodiment, as Figure 4 shown, the separating portion 14 can be the top of the water inlet pipe 11 and also the bottom of the drain pipe 13. In yet another embodiment, as Figure 5 shown, the separating portion 14 can be the top of the water inlet pipe 11. In another embodiment, as Figure 6 shown, the separating portion 14 can be the bottom of the drain pipe 13.

[0114] In some embodiments of this specification, as Figure 7 shown, the drain pipe 13 and the water inlet pipe 11 are an integrally formed single pipe body. The separating portion 14 can be arranged inside the pipe body. The part of the pipe body above the separating portion 14 is the drain pipe 13, and the part of the pipe body below the separating portion 14 is the water inlet pipe 11. By integrally forming the drain pipe 13 and the water inlet pipe 11, there is no need to weld the drain pipe 13 and the water inlet pipe 11, and the structure is simple.

[0115] In some embodiments of this specification, as Figures 4 to 7 shown, the axis of the drain pipe 13 can coincide with the axis of the water inlet pipe 11. By setting the axes of the drain pipe 13 and the water inlet pipe 11 to coincide, it is convenient for the connection between the drain pipe 13 and the water inlet pipe 11 or for the integral forming of the drain pipe 13 and the water inlet pipe 11. Compared with the prior art where an additional first diversion pipe needs to be spot-welded on the extension pipe, in the embodiments of this application, by setting the axis of the water inlet pipe 11 to coincide with the axis of the drain pipe 13, it is convenient for the connection or integral forming of the water inlet pipe 11 and the drain pipe 13. There is no need to additionally set a first diversion pipe or bend the water inlet pipe 11. Instead, only by setting a water inlet portion 132 on the peripheral wall of the drain pipe 13, the heat exchange efficiency between the upper tank 101 and the lower tank 102 can be improved, the manufacturing process can be simplified, and the manufacturing cost can be saved.

[0116] As Figures 1 to 7 shown, in some embodiments of the present specification, the water inlet pipe 11 is a non-bent straight pipe. Compared with a bent pipe, the manufacturing process of a straight pipe is simpler, which can save production costs.

[0117] Please refer to Figure 8 , which shows a schematic diagram of the drainage pipe 13 and the water inlet pipe 11 in the embodiments of the present specification. As Figure 8 shown in the left figure of

[0118] As Figure 8 shown in the middle figure of

[0119] As Figure 8 shown in the left figure of

[0120] As Figure 8 shown in the right figure of

[0121] As Figures 4 to 8 shown, in some embodiments of the present specification, an exhaust hole 133 is provided at the lower part or bottom of the drainage pipe 13, and the exhaust hole 133 is located between the partition part 14 and the water inlet part 132. As Figure 4 、 Figures 6 to 8 shown, the exhaust hole 133 can be provided on the circumferential wall of the lower part of the drainage pipe 13. As Figure 5 shown, the exhaust hole 133 can be provided on the bottom of the drainage pipe 13. By providing the exhaust hole 133 at the lower part or bottom of the drainage pipe 13, it is possible to prevent water from entering the drainage pipe 13 from the water inlet part 132 and forming a liquid seal in a part of the drainage pipe 13 below the water inlet part 132, resulting in a decrease in the amount of hot water.

[0122] Please refer to Figure 9 , which shows a schematic diagram of the structure of the water inlet pipe 11 and the drainage pipe 13 in the embodiments of the present specification. As Figure 9As shown, in some embodiments of the present specification, the water inlet pipe 11 may include an outer pipe 111 and an inner pipe 112, and the inner pipe 112 is located inside the outer pipe 111. The outer pipe 111 has an outer pipe water outlet 1111, and the lower part of the inner pipe 112 has an inner pipe water inlet 1121. The inner pipe 112 also has an inner pipe water outlet 1122 above the inner pipe water inlet 1121 and above the outer pipe water outlet 1111. Water can flow into the lower tank 102 in sequence through the inner pipe water inlet 1121, the inner pipe water outlet 1122, and the outer pipe water outlet 1111. The outer pipe 111 is connected to the drainage pipe 13, or the outer pipe 111 and the drainage pipe 13 are integrally formed. In this embodiment, by setting the water inlet pipe 11 to include the inner pipe 112 and the outer pipe 111, the water entering the inner pipe 112 can first flow from the inner pipe water outlet 1122 into the outer pipe 111 and then flow out from the water outlet of the outer pipe 111, extending the length of the water flow path, thereby increasing the resistance and enabling the water inlet pipe 11 to have an anti-electricity function.

[0123] In some embodiments of the present specification, the lower tank 102 has a connecting portion. As Figures 1 to 7 shown, the electric water heater 1 may further include a joint 15, and the joint 15 is connected to the lower tank 102 through the connecting portion. The joint 15 has a joint through hole penetrating the joint 15 body. The water inlet pipe 11 is installed on the joint 15.

[0124] Please continue to refer to Figure 9 As Figure 9 shown, the water inlet pipe 11 may include an outer pipe 111 and an inner pipe 112 at least partially located in the outer pipe 111. The outer pipe 111 has an outer pipe water outlet 1111. The outer pipe water outlet 1111 and at least a part of the outer pipe 111 are located in the lower tank 102. The part of the outer pipe 111 below the outer pipe water outlet 1111 is connected to the joint 15. The inner pipe 112 is detachably connected to the joint 15. The inner pipe 112 passes through the joint through hole in the joint 15 and extends into the lower tank 102. The lower part of the inner pipe 112 has an inner pipe water inlet 1121. The inner pipe 112 also has an inner pipe water outlet 1122 above the inner pipe water inlet 1121 and above the outer pipe water outlet 1111. Water can flow into the lower tank 102 in sequence through the inner pipe water inlet 1121, the inner pipe water outlet 1122, and the outer pipe water outlet 1111. When the inner pipe 112 is removed from the joint 15, the water in the tank 10 can flow out through the outer pipe water outlet 1111 and the joint through hole. The outer pipe 111 is connected to the drainage pipe 13, or the outer pipe 111 and the drainage pipe 13 are integrally formed.

[0125] In this embodiment, the joint 15 serves as a carrier for installing the water inlet pipe 11 onto the water tank 10. The joint 15 can be connected to the water tank 10 through a connecting portion. The joint 15 has a joint through-hole that penetrates the joint 15 body in the vertical direction. The water inlet pipe 11 is used to introduce external tap water into the water tank 10. The water inlet pipe 11 can be installed on the joint 15. The water inlet pipe 11 can include an outer pipe 111 and an inner pipe 112 partially located in the outer pipe 111.

[0126] As Figure 9 shown, the outer pipe 111 has an outer pipe water outlet 1111, and the outer pipe water outlet 1111 and at least a part of the outer pipe 111 are located in the water tank 10. The outer pipe water outlet 1111 is used to connect the outer pipe 111 to the water tank 10, and the water flowing into the outer pipe 111 can flow into the water tank 10 through the outer pipe water outlet 1111. The interior of the outer pipe 111 is connected to the inner pipe 112, and the water flowing into the inner pipe 112 can flow into the outer pipe 111. Specifically, there can be multiple outer pipe water outlets 1111, and the multiple outer pipe water outlets 1111 can be arranged at intervals along the height direction and the circumferential direction. The shape of the outer pipe water outlet 1111 can be a circular hole or a long hole, and the present application does not make specific limitations here.

[0127] Among them, a part of the outer pipe 111 located below the outer pipe water outlet 1111 is connected to the joint 15. Specifically, the lower part of the outer pipe 111 can be connected to the joint 15 by a fixed connection or a snap connection. The connection method between the lower part of the outer pipe 111 and the joint 15 can also be other methods, as long as it is ensured that the lower part of the outer pipe 111 can be reliably installed on the joint 15.

[0128] In this embodiment, by setting the water inlet pipe 11 to include the inner pipe 112 and the outer pipe 111, the water entering the inner pipe 112 can first flow from the inner pipe water outlet 1122 into the outer pipe 111 and then flow out from the water outlet of the outer pipe 111, extending the length of the water flow path, thereby increasing the resistance and enabling the water inlet pipe 11 to have an anti-electricity function. Further, through the optimization and improvement of the structure of the water inlet assembly with an anti-electricity function, when drainage is required, efficient drainage can be achieved by simply pulling out only the inner pipe 112 from the water tank 10, without disassembling components such as the outer shell of the water heater 1 and the joint 15 connecting the water inlet pipe 11. The operation is simple, the workload and work intensity are low, and even if drainage is performed frequently multiple times, it will not affect the sealing performance and reliability of the mating position of the water tank 10.

[0129] In some embodiments of the present specification, the lower end of the inner tube 112 extends out of the lower end of the joint through-hole, or the lower end of the inner tube 112 is flush with the lower end of the joint through-hole. When the lower end of the inner tube 112 extends out of the lower end of the joint through-hole of the joint 15, or the lower end of the inner tube 112 is flush with the lower end of the joint through-hole of the joint 15, it is convenient for the operator to directly operate the lower end of the inner tube 112, so as to conveniently remove the inner tube 112 from the lower part of the joint 15.

[0130] In some embodiments of the present specification, the electric water heater 1 may include a housing 16, the lower tank 102 is disposed in the housing 16, and the lower end of the joint 15 extends out of the housing 16.

[0131] As Figures 1 to 7 shown, an outer housing 16 is further provided on the outermost part of the electric water heater 1. Among them, the tank 10 is located in the housing 16. The joint 15 may be mostly located in the housing 16. The lower end of the joint 15 may extend out of the housing 16. When the lower end of the joint 15 extends out of the housing 16, the lower end of the inner tube 112 also extends out of the housing 16. Thus, without disassembling the housing 16, after removing the joint 15 from the external water supply pipe, the inner tube 112 can be removed from the lower end of the joint 15. After the inner tube 112 is removed from the joint 15, the water in the inner tank 10 that enters the outer tube 111 through the outer tube water outlet 1111 can directly discharge outward through the joint through-hole of the joint 15, so as to achieve efficient drainage.

[0132] In some embodiments of the present specification, the lower part of the inner tube 112 is detachably connected to the lower part of the joint 15. Since the inner tube 112 and the joint 15 are detachably connected, it is convenient to separately remove the inner tube 112 from the joint 15.

[0133] In some embodiments of the present specification, the inner tube 112 is spaced apart from the joint through-hole, and the inner tube 112 is in sealing cooperation with the joint 15. In this embodiment, the inner tube 112 is inserted into the joint through-hole of the joint 15, and there is a certain gap between the outer surface of the inner tube 112 and the inner surface where the joint through-hole is located. The inner tube 112 and the joint 15 can seal the gap by direct cooperation or by providing a seal, preventing the water in the tank 10 from flowing out through the gap, and at the same time, the inner tube 112 and the joint 15 can be detachably connected.

[0134] In some embodiments of the present specification, the diameter of the water inlet pipe 11 is the same as that of the drainage pipe 13, or the diameter of the drainage pipe 13 is greater than that of the water inlet pipe 11. By setting the diameter of the drainage pipe 13 to be greater than or equal to the diameter of the water inlet pipe 11, the flow rate of the water flowing from the water inlet pipe 11 into the drainage pipe 13 can be made larger, and the heat exchange efficiency between the upper tank 101 and the lower tank 102 can be improved.

[0135] This embodiment of the specification also provides an electric water heater. Please refer to Figure 10 and Figure 11 , which show a schematic structural diagram of the electric water heater in this embodiment of the specification. As shown in Figure 10 and Figure 11 , the electric water heater 1 may include: a tank 10, a water inlet pipe 11, a heating element 12, and a drainage pipe 13. The tank 10 may include an upper tank 101 and a lower tank 102. The upper tank 101 and the lower tank 102 may include a hollow tank body. The upper tank 101 is located above the lower tank 102. The lower tank 102 is connected to the upper tank 101 through a communication part 103. The upper tank 101 and the lower tank 102 are horizontally placed inner tanks 10, that is, the horizontal length of the inner tank 10 is greater than the height of the inner tank 10.

[0136] In one embodiment, a first communication port is provided on the upper tank 101, a second communication port is provided on the lower tank 102, and the communication part 103 is used to connect the first communication port and the second communication port. The upper end of the communication pipe may be hermetically connected to the edge of the first communication port, the lower end of the communication pipe may be hermetically connected to the edge of the second communication port, and a through hole may be provided on the communication part 103 to connect the upper tank 101 and the lower tank 102.

[0137] The water inlet pipe 11 is used to supply water to the tank 10. The water inlet pipe 11 may be used to supply water to the upper tank 101 and / or the lower tank 102. The water inlet pipe 11 may supply the water flowing out of the external water source to the tank 10.

[0138] The electric water heater 1 may include at least one heating element 12. The heating element 12 may be provided in the upper tank 101, or may be provided in the lower tank 102, or the heating element 12 may be provided in both the upper tank 101 and the lower tank 102 at the same time, which is not limited herein.

[0139] As shown in Figure 10 and Figure 11 , the drainage pipe 13 may be located in the tank 10. A part of the bottom of the drainage pipe 13 may be connected to the top of the water inlet pipe 11. The drainage pipe 13 and the water inlet pipe 11 may be separated by a separation part 14 at the connection position. In one embodiment, as shown in Figure 10 , the separation part 14 may be a part of the bottom of the drainage pipe 13. In another embodiment, as shown in Figure 11 , the separation part 14 is the top of the water inlet pipe 11. The drainage pipe 13 has a water outlet part 131 and a water inlet part 132 provided on the bottom of another part of the drainage pipe 13. The bottom of another part of the drainage pipe 13 refers to the other part of the bottom of the drainage pipe 13 except for the part of the bottom connected to the top of the water inlet pipe 11. The water outlet part 131 of the drainage pipe 13 is located above the water inlet part 132. The water in the communication part 103 and / or the water in the lower tank 102 can enter the drainage pipe 13 through the water inlet part 132 and flow to the upper tank 101 from the water outlet part 131.

[0140] Please refer to Figure 12 , which shows a schematic structural diagram of the bottom of the drainage pipe. As Figure 12 shown, a part of the bottom 135 of the drainage pipe 13 is connected to the top of the water inlet pipe 11. An inlet water part 132 is arranged on the other part of the bottom 136 of the drainage pipe 13.

[0141] In the above embodiment, by arranging the drainage pipe 13 in the tank 10 of the electric water heater 1, the water in the communication part 103 and / or the water in the lower tank 102 can flow into the drainage pipe 13 through the inlet water part 132 on the bottom of the drainage pipe 13, and flow from the water outlet part 131 of the drainage pipe 13 to the upper tank 101, which can improve the convective heat transfer efficiency between the water in the lower tank 102 and the water in the upper tank 101, so that only by arranging the heating element 12 in the upper tank 101 or the lower tank 102, the heating of the water in the upper tank 101 and the lower tank 102 can be realized, and the production cost can be effectively reduced. In addition, by setting a part of the bottom of the drainage pipe 13 to be connected to the top of the water inlet pipe 11, the drainage pipe 13 can be fixed in the tank 10, and the structure is simple and flexible. By arranging the drainage pipe 13 and the water inlet pipe 11 to be separated by the separation part 14 at the connection position, the water in the water inlet pipe 11 can be blocked from directly entering the drainage pipe 13, and the water flowing into the tank 10 from the water inlet pipe 11 can be prevented from directly entering the drainage pipe 13 and affecting the heat transfer efficiency. Further, by arranging the inlet water part 132 on the other part of the bottom of the drainage pipe 13, it is convenient for the water in the lower tank 102 or the communication part 103 to flow into the drainage pipe 13. Moreover, compared with the prior art that an additional first diversion pipe needs to be spot-welded on the extension pipe, in this embodiment, the top of the water inlet pipe 11 can be connected to a part of the bottom of the drainage pipe 13 or the water inlet pipe 11 and the drainage pipe 13 are integrally formed. The drainage pipe 13 can be regarded as an extension of the water inlet pipe 11. Only by arranging the inlet water part 132 on the other part of the bottom of the drainage pipe 13, the convective heat transfer efficiency between the water in the lower tank 102 and the water in the upper tank 101 can be improved, and there is no need to additionally arrange the first diversion pipe. The structure and process are relatively simple, and the cost can be further reduced.

[0142] In some embodiments of this specification, the inlet water part 132 is located in the communication part 103 or the lower tank 102. By arranging the inlet water part 132 in the communication part 103 or the lower tank 102, it is convenient for the water in the communication part 103 or the lower tank 102 to enter the drainage pipe 13 from the inlet water part 132.

[0143] In some embodiments of this specification, the water outlet part 131 is located in the upper tank 101. By arranging the water outlet part 131 in the upper tank 101, it is convenient for the water in the drainage pipe 13 to flow from the water outlet part 131 to the upper tank 101.

[0144] In some embodiments of the present specification, the water inlet part 132 is a water inlet hole provided at the bottom of the other part of the drainage pipe 13.

[0145] As Figure 10 shown, in some embodiments of the present specification, the water outlet part 131 is an opening provided at the top of the drainage pipe 13. As Figure 11 shown, in some embodiments of the present specification, the water outlet part 131 is a water outlet hole provided on the peripheral wall of the drainage pipe 13. Of course, in some embodiments, the water outlet part 131 includes an opening provided at the top of the drainage pipe 13 and a water outlet hole provided on the peripheral wall of the drainage pipe 13.

[0146] In some embodiments of the present specification, the water inlet hole and / or the water outlet hole is a round hole, a square hole or an oval hole. As Figures 10 to 11 shown, the water inlet hole and / or the water outlet hole can be a round hole. Of course, in other embodiments, the water inlet hole and / or the water outlet hole can also be a square hole, an oval hole or a hole of other shapes.

[0147] In some embodiments of the present specification, the drainage pipe 13 and the water inlet pipe 11 are an integrally formed same pipe body. The partition part 14 is arranged inside the pipe body. The part of the pipe body above the partition part 14 is the drainage pipe 13, and the part of the pipe body below the partition part 14 is the water inlet pipe 11. The drainage pipe 13 and the water inlet pipe 11 are obtained by integral molding, without welding the drainage pipe 13 and the water inlet pipe 11, and the structure is simple.

[0148] In some embodiments of the present specification, the axis of the drainage pipe 13 coincides with the axis of the water inlet pipe 11. By setting the axes of the drainage pipe 13 and the water inlet pipe 11 to coincide, it is convenient for the connection between the drainage pipe 13 and the water inlet pipe 11 or for the integral molding of the drainage pipe 13 and the water inlet pipe 11.

[0149] In some embodiments of the present specification, the water inlet pipe 11 is a non-bent straight pipe. Compared with a bent pipe, the manufacturing process of a straight pipe is simpler, and the production cost can be saved.

[0150] In some embodiments of the present specification, the partition part 14 is connected to the inner surface and / or the end surface of the drainage pipe 13 and / or the water inlet pipe 11.

[0151] In some embodiments of the present specification, the partition part 14 is connected to the inner surface and / or the end surface of the drainage pipe 13 and / or the water inlet pipe 11 by a welding process.

[0152] In some embodiments of the present specification, the water inlet pipe 11 may include an outer pipe and an inner pipe, and the inner pipe is located inside the outer pipe. The outer pipe has an outer pipe water outlet, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank 102 in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet. The outer pipe is connected to the drainage pipe 13, or the outer pipe and the drainage pipe 13 are integrally formed. The specific implementation manner can refer to the description in the above related embodiments. By setting the water inlet pipe 11 to include an inner pipe and an outer pipe, the water entering the inner pipe can first flow out from the inner pipe water outlet into the outer pipe and then flow out from the water outlet of the outer pipe, extending the length of the water flow path, thereby increasing the resistance and enabling the water inlet pipe 11 to have an anti-electricity function.

[0153] In some embodiments of the present specification, the lower tank 102 has a connecting portion. The electric water heater 1 may further include a joint 15, and the joint 15 is connected to the lower tank 102 through the connecting portion. The joint 15 has a joint through hole penetrating the body of the joint 15. The water inlet pipe 11 is installed on the joint 15. The water inlet pipe 11 may include an outer pipe and an inner pipe at least partially located in the outer pipe. The outer pipe has an outer pipe water outlet, the outer pipe water outlet and at least a part of the outer pipe are located in the lower tank 102, and the part of the outer pipe below the outer pipe water outlet is connected to the joint 15. The inner pipe is detachably connected to the joint 15, the inner pipe passes through the joint through hole and extends into the lower tank 102, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank 102 in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet. When the inner pipe is removed from the joint 15, the water in the tank 10 can flow out through the outer pipe water outlet and the joint through hole. The specific implementation manner can refer to the description in the above related embodiments.

[0154] In the above embodiments, by setting the water inlet pipe 11 to include an inner pipe and an outer pipe, the water entering the inner pipe can first flow out from the inner pipe water outlet into the outer pipe and then flow out from the water outlet of the outer pipe, extending the length of the water flow path, thereby increasing the resistance and enabling the water inlet pipe 11 to have an anti-electricity function. Further, by optimizing and improving the structure of the water inlet assembly with an anti-electricity function, when it is necessary to empty the water, efficient emptying can be achieved by only pulling out the inner pipe alone from the tank 10, without disassembling components such as the outer shell of the electric water heater 1 and the joint 15 connecting the water inlet pipe 11. The operation is simple, the workload and working intensity are low, and even if the water is emptied frequently for many times, it will not affect the sealing performance and reliability of the matching position of the tank 10.

[0155] In some embodiments of the present specification, the diameter of the drainage pipe 13 is larger than the diameter of the water inlet pipe 11. By setting the diameter of the drainage pipe 13 to be larger than the diameter of the water inlet pipe 11, the flow rate of the water flowing from the water inlet pipe 11 into the drainage pipe 13 can be made larger, which can improve the heat exchange efficiency between the upper tank 101 and the lower tank 102.

[0156] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. Specifically, reference can be made to the descriptions of the relevant embodiments of the foregoing related processing, and details will not be repeated here.

[0157] It should be understood that the above description is for illustrative purposes rather than for limitation. By reading the above description, many embodiments and many applications other than the provided examples will be obvious to those skilled in the art. Therefore, the scope of this specification should not be determined with reference to the above description, but should be determined with reference to the full scope of the foregoing claims and the equivalents of these claims.

[0158] The above are only the preferred embodiments of this specification and are not used to limit this specification. For those skilled in the art, various changes and modifications can be made to the embodiments of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included within the protection scope of this specification.

Claims

1. An electric water heater, characterized in that, Comprising: A bile, said bile including an upper bile and a lower bile, the upper bile being located above the lower bile, and the lower bile being connected to the upper bile through a communication part; A water inlet pipe for supplying water to the bile; A heating element for heating the water in the bile; A drainage pipe located in the bile and connected to the bile and / or the communication part and / or the water inlet pipe. The drainage pipe has a water outlet part and a water inlet part provided on the peripheral wall of the drainage pipe. The water outlet part is located above the water inlet part. The water in the communication part and / or the water in the lower bile can enter the drainage pipe through the water inlet part and flow from the water outlet part to the upper bile.

2. The electric water heater according to claim 1, wherein The water inlet part is located in the communication part or the lower bile, and / or The water outlet part is located in the upper bile.

3. The electric water heater according to claim 1, wherein The water inlet part is a water inlet hole provided on the peripheral wall of the drainage pipe; and / or The water outlet part is an opening provided at the top of the drainage pipe or a water outlet hole provided on the peripheral wall of the drainage pipe.

4. The electric water heater according to claim 3, wherein The water inlet hole and / or the water outlet hole is a round hole, a square hole or an oval hole.

5. The electric water heater according to claim 1, wherein The drainage pipe is connected to the water inlet pipe; The drainage pipe and the water inlet pipe are separated by a partition at the connection position.

6. The electric water heater according to claim 5, wherein The bottom of the drainage pipe is connected to the top of the water inlet pipe; The partition is the bottom of the drainage pipe, and / or the partition is the top of the water inlet pipe.

7. The electric water heater according to claim 5, wherein The drainage pipe and the water inlet pipe are an integrally formed same pipe body; The partition is provided inside the pipe body; the part of the pipe body above the partition is the drainage pipe, and the part of the pipe body below the partition is the water inlet pipe.

8. The electric water heater according to claim 5 or 7, wherein The axis of the drainage pipe coincides with the axis of the water inlet pipe.

9. The electric water heater according to claim 5 or 7, wherein The water inlet pipe is a non-bent straight pipe.

10. The electric water heater according to claim 5 or 7, wherein The partition is connected to the inner surface of the drainage pipe and / or the water inlet pipe, or the partition is limited by a limiting member on the inner surface of the drainage pipe and / or the water inlet pipe.

11. The electric water heater according to claim 10, wherein The partition is connected to the inner surface of the drainage pipe and / or the water inlet pipe by a welding process; or The limiting member is a groove extending into the pipe provided on the pipe wall of the drainage pipe and / or the water inlet pipe.

12. The electric water heater according to claim 5 or 7, wherein An exhaust hole is provided at the lower part or the bottom of the drainage pipe, and the exhaust hole is located between the partition and the water inlet part.

13. The electric water heater according to claim 5 or 7, characterized in that the water inlet pipe includes an outer pipe and an inner pipe, and the inner pipe is located inside the outer pipe; the outer pipe has an outer pipe water outlet, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet; the outer pipe is connected to the drainage pipe, or the outer pipe and the drainage pipe are integrally formed.

14. The electric water heater according to claim 5 or 7, characterized in that the lower tank has a connecting part; the electric water heater further includes a connector, the connector is connected to the lower tank through the connecting part, and the connector has a connector through hole penetrating the connector body; the water inlet pipe is installed on the connector; the water inlet pipe includes an outer pipe and an inner pipe at least partially located in the outer pipe, the outer pipe has an outer pipe water outlet, the outer pipe water outlet and at least a part of the outer pipe are located in the lower tank, and a part of the outer pipe below the outer pipe water outlet is connected to the connector, the inner pipe is detachably connected to the connector, the inner pipe passes through the connector through hole and extends into the lower tank, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank in sequence through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet. When the inner pipe is removed from the connector, the water in the tank can flow out through the outer pipe water outlet and the connector through hole; the outer pipe is connected to the drainage pipe, or the outer pipe and the drainage pipe are integrally formed.

15. The electric water heater according to claim 14, characterized in that, the lower end of the inner pipe extends out of the lower end of the connector through hole, or the lower end of the inner pipe is flush with the lower end of the connector through hole.

16. The electric water heater according to claim 15, characterized in that, the electric water heater includes a housing, the lower tank is arranged in the housing, and the lower end of the connector extends out of the housing.

17. The electric water heater according to claim 14, characterized in that, the lower part of the inner pipe is detachably connected to the lower part of the connector.

18. The electric water heater according to claim 14, characterized in that, the inner pipe is arranged at an interval from the connector through hole, and the inner pipe is in sealed cooperation with the connector.

19. The electric water heater according to claim 1, characterized in that the water inlet pipe and the drainage pipe have the same diameter, or the diameter of the drainage pipe is larger than the diameter of the water inlet pipe.

20. An electric water heater, characterized in that, Comprising: a tank, the tank includes an upper tank and a lower tank, the upper tank is located above the lower tank, and the lower tank is connected to the upper tank through a communicating part; a water inlet pipe for supplying water to the tank; a heating element for heating the water in the tank; A drainage pipe, the drainage pipe is located in the gallbladder, and a part of the bottom of the drainage pipe is connected to the top of the water inlet pipe; the drainage pipe and the water inlet pipe are separated by a partition at the connection position, the partition is a part of the bottom of the drainage pipe, and / or the partition is the top of the water inlet pipe; the drainage pipe has a water outlet part and a water inlet part arranged on the bottom of another part of the drainage pipe, the water outlet part is located above the water inlet part, and the water in the communication part and / or the water in the lower gallbladder can enter the drainage pipe through the water inlet part and flow from the water outlet part to the upper gallbladder.

21. The electric water heater according to claim 20, wherein the water inlet part is located in the communication part or the lower gallbladder, and / or the water outlet part is located in the upper gallbladder.

22. The electric water heater according to claim 20, wherein the water inlet part is a water inlet hole arranged on the bottom of another part of the drainage pipe; and / or the water outlet part is an opening arranged at the top of the drainage pipe or a water outlet hole arranged on the peripheral wall of the drainage pipe.

23. The electric water heater according to claim 22, wherein the water inlet hole and / or the water outlet hole is a round hole, a square hole or an oval hole.

24. The electric water heater according to claim 20, wherein the drainage pipe and the water inlet pipe are an integrally formed same pipe body; the partition is arranged inside the pipe body; the part of the pipe body above the partition is the drainage pipe, and the part of the pipe body below the partition is the water inlet pipe.

25. The electric water heater according to claim 20 or 24, wherein the axis of the drainage pipe coincides with the axis of the water inlet pipe.

26. The electric water heater according to claim 20 or 24, wherein the water inlet pipe is a non-bent straight pipe.

27. The electric water heater according to claim 20 or 24, wherein the partition is connected to the inner surface and / or the end surface of the drainage pipe and / or the water inlet pipe.

28. The electric water heater according to claim 27, wherein the partition is connected to the inner surface and / or the end surface of the drainage pipe and / or the water inlet pipe by a welding process.

29. The electric water heater according to claim 20 or 24, wherein the water inlet pipe includes an outer pipe and an inner pipe, and the inner pipe is located inside the outer pipe; the outer pipe has an outer pipe water outlet, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet, and water can flow into the lower gallbladder through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet in sequence; the outer pipe is connected to the drainage pipe, or the outer pipe and the drainage pipe are integrally formed.

30. The electric water heater according to claim 20 or 24, wherein the lower gallbladder has a connection part; the electric water heater further includes a joint, the joint is connected to the lower gallbladder through the connection part, and the joint has a joint through hole penetrating the joint body; the water inlet pipe is installed on the joint; The water inlet pipe includes an outer pipe and an inner pipe at least partially located in the outer pipe; The outer pipe has an outer pipe water outlet, the outer pipe water outlet and at least a part of the outer pipe are located in the lower tank, and a part of the outer pipe below the outer pipe water outlet is connected to the joint; The inner pipe is detachably connected to the joint, the inner pipe passes through the through hole of the joint and extends into the lower tank, the lower part of the inner pipe has an inner pipe water inlet, and the inner pipe also has an inner pipe water outlet above the inner pipe water inlet and above the outer pipe water outlet. Water can flow into the lower tank through the inner pipe water inlet, the inner pipe water outlet, and the outer pipe water outlet in sequence. When the inner pipe is removed from the joint, the water in the tank can flow out through the outer pipe water outlet and the through hole of the joint; The outer pipe is connected to the drainage pipe, or the outer pipe is integrally formed with the drainage pipe.

31. The electric water heater according to claim 20, wherein the diameter of the drainage pipe is larger than the diameter of the water inlet pipe.

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