CN219346811U - Waterproof structure and electric water heater - Google Patents

Abstract

The application relates to a waterproof construction and electric water heater belongs to electrical apparatus technical field. Comprising the following steps: the water pipe sequentially passes through the upper end cover and the maintenance cover; the decorative cover is sleeved on the water pipe and is positioned at the top of the maintenance cover; the sealing ring is arranged at the contact position of the annular bulge of the upper end cover and the extension part, and the contact position of the decorative cover and the water pipe. The sealing ring arranged at the contact position can effectively prevent water from penetrating, and the waterproof structure not only has good waterproof effect, but also is not influenced by the installation position.

Description

Waterproof structure and electric water heater

Technical Field

The application belongs to the technical field of electric water heaters, and particularly relates to a waterproof structure and an electric water heater.

Background

In the life of people, electric water heaters are installed in kitchens or toilets, and with the continuous improvement of the production technology level and the continuous increase of the user demands, the requirements of users on the electric water heaters are also higher and higher.

The kitchen appliance as one type of electric water heater consists of casing, maintaining cover, heat insulating layer, inner container, heating pipe, etc. and has the advantages of fast heating speed, small volume, etc. and may be used widely in kitchen, toilet, etc. The kitchen or toilet water may permeate into the product through the gap between the parts, which may adversely affect the inner container and the internal electric appliances, so that the electric water heater should have high water resistance. In the prior art, in order to enable the product to meet the waterproof requirement, a waterproof structure is added in the product, the waterproof structure is usually a water guide groove, and when water permeates into the product, the water can flow to a drain hole which is formed in advance through the water guide groove, so that external water is prevented from permeating into the product.

Although the mode can play a certain waterproof effect, in some special cases, such as inclined installation of products, water in the water guide groove cannot smoothly flow out, and the water guide groove cannot play a waterproof effect.

Disclosure of Invention

The application provides a waterproof construction and electric water heater for solve among the prior art because of the product installation slope lead to the water in the guiding gutter can not flow out smoothly, the guiding gutter can't play the problem of water-proof effects.

In a first aspect, in an embodiment of the present application, a waterproof structure is provided, including: the water pipe sequentially passes through the upper end cover and the maintenance cover; the decorative cover is sleeved on the water pipe and is positioned at the top of the maintenance cover; the sealing ring is arranged at the contact position of the annular bulge of the upper end cover and the extension part, and the contact position of the decorative cover and the water pipe.

In the above preferred technical scheme, the outer wall of the water pipe is provided with a water pipe annular groove, the sealing ring is positioned in the water pipe annular groove, and the sealing ring is attached to the inner wall of the decorative cover.

In the above preferred technical solution, the bottom of the decorative cover is provided with a decorative cover annular groove, the top of the maintenance cover is provided with a maintenance cover annular protrusion, and the decorative cover annular groove is buckled and pressed on the maintenance cover annular protrusion.

In the above preferred technical solution, the extension portion is located outside the annular protrusion of the upper end cover, and the seal ring is respectively attached to the extension portion and the annular protrusion of the upper end cover.

In the above preferred technical solution, the top surfaces of the upper end cover and the decorative cover are both inclined surfaces.

In the above preferred technical solution, the upper end cover is annular or square.

In the above preferred technical solution, the upper end cover and the maintenance cover are connected by screws.

In the above preferred technical solution, the sealing ring is made of silicone rubber, EPDM, PVC or polyurethane.

In the above preferred technical solution, the cross-sectional shape of the seal ring is a circle, a polygon or a gear shape.

In a second aspect, the embodiment further provides an electric water heater, including a housing and an inner container, where the inner container is disposed inside the housing, and the top of the housing is provided with the waterproof structure as described in the first aspect.

It can be appreciated by those skilled in the art that the embodiment of the application provides a waterproof structure and an electric water heater, which comprises an upper end cover, a maintenance cover and a water pipe, wherein the maintenance cover is arranged above the upper end cover, an upper end cover annular bulge is arranged at the top of the upper end cover, the edge of a cover body of the maintenance cover extends downwards to form an extension part, and the water pipe sequentially penetrates through the upper end cover and the maintenance cover; the decorative cover is sleeved on the water pipe and is positioned at the top of the maintenance cover; the sealing ring is arranged at the contact position of the annular bulge of the upper end cover and the extension part, and the contact position of the decorative cover and the water pipe. When water enters the electric water heater from the connection position of the maintenance cover and the upper end cover and the connection position of the water pipe and the decorative cover, the sealing ring arranged at the connection position can effectively prevent water from penetrating, and the waterproof structure not only has good waterproof effect, but also is not influenced by the installation position.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural view of a waterproof structure provided in the present application;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a schematic structural diagram of an electric water heater with a waterproof structure provided by the present application.

Reference numerals illustrate: 100-an upper end cap; 110-a sealing ring; 120-extensions; 130-repair covers; 131-a maintenance cap annular projection; 140-a decorative cover; 141-a decorative cover annular groove; 150-upper end cap annular protrusion; 200-water pipes; 210-a water pipe annular groove; 300-an insulating layer; 400-a housing; 500-an inner container; 600-lower end cap.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the embodiments of the present application, it should be understood that the terms "inner," "outer," "upper," "bottom," "front," "rear," and the like indicate orientations or positional relationships, if any, based on those shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

As described in the background art, the electric water heater in the prior art is generally composed of a casing, a maintenance cover, a heat insulation layer, an inner container, a heating pipe and the like, and in order to make a product reach a waterproof requirement, a waterproof structure is added in the product, the waterproof structure is generally a water guide groove, and when water permeates into the product, the water can flow to a drain hole which is formed in advance through the water guide groove, so that external water is prevented from permeating into the product. Although the mode can play a certain waterproof effect, in some special cases, such as inclined installation of products, water in the water guide groove cannot flow out smoothly, the water guide groove cannot play a waterproof effect, and therefore internal components of the electric water heater are damaged.

The embodiment of the application provides a waterproof structure and an electric water heater, wherein sealing rings are arranged at the connecting positions of all parts of the electric water heater, so that water is prevented from penetrating into the electric water heater, and the parts are damaged. The waterproof water heater has good waterproof effect, is not limited in installation position of the electric water heater, and is suitable for various installation environments.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a waterproof structure provided by the application, which comprises an upper end cover 100, a maintenance cover 130 and a water pipe 200, wherein the maintenance cover 130 is arranged above the upper end cover 100, an upper end cover annular bulge 150 is arranged at the top of the upper end cover 100, the cover body edge of the maintenance cover 130 extends downwards to form an extension part 120, and the water pipe 200 sequentially penetrates through the upper end cover 100 and the maintenance cover 130; the decorative cover 140 is sleeved on the water pipe 200 and is positioned at the top of the maintenance cover 130; the sealing ring 110 is disposed at a contact position of the upper cover annular protrusion 150 and the extension 120, and at a contact position of the decorative cover 140 and the water pipe 200.

In the above-mentioned technical solution, in order to facilitate the installation and the disassembly, the upper end cap 100, the maintenance cap 130, the decoration cap 140 and the water pipe 200 are usually connected by screws or buckles, and gaps are generated between the contact positions of the above-mentioned components, mainly the contact position of the upper end cap 100 and the maintenance cap 130 and the contact position of the water pipe 200 and the decoration cap 140. In this embodiment, the sealing ring 110 is installed at both contact positions to block the gap existing at the contact position, thereby preventing water from flowing into the main body from the gap. The waterproof structure not only has good waterproof effect, but also is not influenced by the installation position, and can meet the condition that the waterproof structure needs to be installed obliquely.

Illustratively, the maintenance cover 130 is further provided with a limiting groove, the decorative cover 140 is located in the limiting groove, the middle part of the limiting groove is the water pipe 200, and the inner groove wall of the limiting groove is attached to the outer wall of the decorative cover 140. The limit groove and the maintenance cover 130 are integrally formed and punched. And because the limit groove is attached to the decorative cover 140, static friction exists between the limit groove and the decorative cover, and loosening or sliding of the decorative cover 140 can be further avoided.

In the above-mentioned technical solution, the height of the limiting groove is parallel to the height of the decorative cover 140, and when water flows onto the decorative cover 140, the contact position between the decorative cover 140 and the water pipe 200 is not able to enter the water from the contact position due to the action of the sealing ring 110, and the water can only flow to the upper end cover 100 along the top of the decorative cover 140, thereby draining the water.

In the above technical solution, in order to avoid water entering from the gap between the decorative cover 140 and the limit groove, although a blocking structure is provided between the decorative cover 140 and the upper end cover 100, accumulated water in the gap between the decorative cover 140 and the limit groove can corrode the decorative cover 140, and affect the service life of the decorative cover 140. Therefore, the seal ring 110 may be installed between the limiting groove and the decorative cover 140, and the installation structure of the seal ring 110 may be an installation method between the water pipe 200 and the decorative cover 140.

In this embodiment, the upper end cover 100, the maintenance cover 130 and the decoration cover 140 are sequentially installed from bottom to top, and the three covers are all circular, and the shape of the cylinder can be changed according to actual operation requirements.

In the above technical aspects, in order to ensure beauty and reduce weight, plastic products are generally used for the upper cover, the maintenance cover, and the decorative cover, and the plastic products are made of polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and the like.

In the above-mentioned technical solution, it should be understood by those skilled in the art that the sealing rings 110 at the contact position of the upper end cap 100 and the maintenance cap 130 and the contact position of the water pipe 200 and the decoration cap 140 are not uniform in size due to the limitation of the shapes of the components, and in this embodiment, the circumference of the sealing ring 110 at the contact position of the upper end cap 100 and the maintenance cap 130 is longer than the circumference of the sealing ring 110 at the contact position of the water pipe 200 and the decoration cap 140.

An embodiment in which the sealing ring 110 is installed at the contact position between the water pipe 200 and the decorative cover 140 is exemplified. Firstly, the sealing ring 110 is sleeved on the outer wall of the water pipe 200, the sealing ring 110 and the water pipe 200 can be adhered together by adhesive, and then the decorative cover 140 is directly sleeved outside the sealing ring 110. The implementation mode is simple in structure and convenient to operate.

For example, in the above technical solution, the sealing ring 110 is directly installed on the outer wall of the water pipe 200, and the outer wall of the water pipe 200 is smooth, which may cause the sealing ring 110 to slide down during installation, thereby affecting the waterproof effect.

Therefore, another embodiment of the sealing ring 110 installed at the contact position between the water pipe 200 and the decorative cover 140 is proposed, as shown in fig. 2, fig. 2 is an enlarged view of a position a in fig. 1, the outer wall of the water pipe 200 is provided with a water pipe annular groove 210, the sealing ring 110 is located in the water pipe annular groove 210, and the sealing ring 110 is attached to the inner wall of the decorative cover 140.

Wherein the water pipe annular groove 210 is disposed around the outer wall of the water pipe 200, and the depth of the water pipe annular groove 210 is smaller than the diameter of the sealing ring 110, so that when the sealing ring 110 is positioned in the water pipe annular groove 210, a portion of the sealing ring 110 protrudes out of the water pipe annular groove 210 for abutting against the inner wall of the decorative cover 140. Realizing the function of blocking water. This way, the sealing ring 110 is fixed in the annular groove 210 of the water pipe, so that the situation that the sealing ring 11 may slide in the installation process is effectively avoided.

In the above two embodiments, in order to achieve better waterproof effect, the sealing ring 110 with a wider width may be used, so that the contact area between the sealing ring 110 and the decorative cover 140 is larger, and water is more difficult to pass through the sealing ring 110, thereby improving the waterproof effect.

In the above technical solution, the bottom of the decorative cover 140 is provided with the decorative cover annular groove 141, the top of the maintenance cover 130 is provided with the maintenance cover annular protrusion 131, and the decorative cover annular groove 141 is buckled on the maintenance cover annular protrusion 131. The decorative cover annular groove 141 is the same size as the repair cover annular projection 131. When the decorative cover 140 is fitted over the water pipe 200, the decorative cover annular groove 141 surrounds the water pipe 200.

When the annular groove 141 is pressed against the annular protrusion 131, the decorative cap 140 can be fixed on the top of the maintenance cap 130 due to static friction between the wall of the annular groove 141 and the side wall of the annular protrusion 131, and the annular protrusion 131 can prevent water from entering the inside of the housing through the gap between the maintenance cap 130 and the decorative cap 140.

In the above-mentioned technical solution, for the gap existing between the maintenance cap 130 and the upper end cap 100, this embodiment proposes an implementation of a waterproof structure, where the extension 120 of the maintenance cap 130 is disposed outside the upper end cap annular protrusion 150, and the seal ring 110 is respectively attached to the extension 120 and the upper end cap annular protrusion 150.

The seal ring 110 may be fixed to the outside of the upper cap annular protrusion 150, or may be fixed to the inside of the extension 120 or the upper cap 100 when it is mounted. When a gap is formed between the aged sealing ring 110 and the upper end cap 100, the upper end cap annular protrusion 150 can also have a waterproof effect.

Wherein, the height of the upper end cover annular protrusion 150 is lower than the height of the extension part 120, and the interval between the upper end cover annular protrusion 150 and the extension part 120 is slightly smaller than the width of the sealing ring 110. Ensuring that the sealing ring 110 generates a certain pressure on the inner wall of the extension 120 ensures the tightness of the sealing ring 110.

In this embodiment, for the fixing position of the sealing ring 110, an optimal implementation manner is provided, where the sealing ring 110 is respectively bonded with the outer side of the annular protrusion 150 of the upper end cover and the upper end cover 100, so as to ensure that the sealing ring 110 is firmly fixed. When the maintenance cover 130 is mounted on the upper end cap 100, the inner wall of the extension part 120 is attached to the flexible sealing ring 110, and when external water permeates into the gap between the extension part 120 and the upper end cap 100, the sealing ring 110 effectively blocks the water in the gap, thereby improving the waterproof effect.

In performing the waterproof construction installation, the seal ring 110 between the upper end cap annular protrusion 150 and the extension portion is not affected even if the waterproof construction is installed obliquely in order to satisfy the environmental requirement.

For example, the upper end cap annular protrusion 150 may be disposed outside the extension 120, and the seal ring 110 is respectively attached to the outer wall of the extension 120 and the inner wall of the upper end cap annular protrusion 150.

In the above technical solution, the top surfaces of the upper end cover 100 and the decorative cover 140 are inclined surfaces, and the middle part of the inclined surfaces is higher than the periphery, so that water can flow away from the top surfaces of the upper end cover 100 and the decorative cover 140.

In the above technical solution, the upper end cap 100 is circular or square, and when the maintenance cap 130 is mounted on the top of the circular upper end cap 100, a mounting space is formed, and various components are placed in the mounting space.

In the above technical solution, the material of the sealing ring 110 is silicone rubber, EPDM, PVC or polyurethane. The silicone rubber has the performances of heat resistance, cold resistance, dielectric property, ozone resistance, atmospheric aging resistance and the like. The outstanding performance is that the use temperature is wide, the sealing ring can be used for a long time at-60 ℃ (or lower) to +250 ℃ (or higher), and the sealing ring 110 has little influence on the temperature because the temperature of the connection position of the electric water heater component cannot exceed 100 ℃, so that the sealing ring 110 has longer service life.

The silicone rubber also has excellent physiological inertia, so that the silicone rubber can be subjected to molding, calendaring and extrusion processing under the condition of low energy consumption. The seal ring 110 made of silicone rubber can meet the operation requirement of the utility model.

The sealing ring 110 is made of foam rubber, and the filling property of the foam rubber can be used after the upper end cover 100, the maintenance cover 130 and the water pipe 200 are installed, and the sealing ring is used at the contact position of the annular protrusion 150 of the upper end cover and the extension part 120 and the contact position of the decorative cover 140 and the water pipe 200.

For example, the cross-sectional shape of the seal ring 110 may be a circle, a polygon, a gear, or other structures capable of realizing sealing, and may be designed according to practical requirements.

When the waterproof structure of the present utility model is installed, the sealing ring 110 may be first installed to the water pipe annular groove 210 and the upper end cap 100, and then the maintenance cap 130 and the decoration cap 140 may be sequentially installed.

Fig. 3 is a schematic structural view of an electric water heater with a waterproof structure provided in the present application. The embodiment also provides an electric water heater, which comprises a shell and an inner container 500, wherein the inner container 500 is arranged inside the shell, and a waterproof structure is arranged at the top of the shell. The electric water heater adopts electric energy as main energy fuel, and an electric heating tube is adopted to heat water in the inner container 500 after the electric water heater is electrified, so that the purpose of preparing hot water is achieved.

It should be noted that this embodiment employs an upper water outlet type electric water heater. The upper water outlet type electric water heater is mainly used for kitchen washing and is arranged in a cabinet.

In the above technical solution, the casing is composed of an upper end cover 100, a casing 400 and a lower end cover 600, in this embodiment, the casing is cylindrical, the lower end cover 600 is mounted at the bottom of the casing 400, and a supporting seat is mounted at the bottom of the lower end cover 600, where the supporting seat is used for supporting and fixing the electric water heater.

The upper end cover 100 of the waterproof structure is mounted at the top of the casing 400, the upper end cover 100 and the lower end cover 600 are respectively clamped with the casing, and in order to avoid water inflow at the clamping position, a sealing ring 110 is also arranged at the clamping position, so that the waterproof effect can be further improved.

In the above technical solution, the top of the housing 400 extends inward to form an inner edge, and the edge of the upper end cap 100 extends upward to form an outer edge. When the housing 400 and the upper end cap 100 are mounted, the outer edge is engaged with the inner edge, and the inner edge is positioned on top of the outer edge. The upper end cover 100 and the outer shell 400 are connected by the inner edge and the outer edge which are clamped.

The bottom of the housing 400 is connected to the lower cap 600 in the same manner as the top of the housing 400 is connected to the upper cap 100. By adopting the clamping mode, the cover body and the shell are convenient to mount and dismount, the gap between the cover body and the connecting part of the shell is reduced, and water can be effectively prevented from entering from the connecting part of the cover body and the shell between the inner edge extending inwards and the outer edge extending upwards.

In the above technical solution, it should be noted that the fixing cannot be achieved only by the clamping between the outer edge and the inner edge, and a supporting force matched with the clamping can be applied to the cover body through the liner 500 or the insulation layer 300. After the outer edge and the inner edge of the upper end cover 100 are clamped, an upward supporting force is provided for the upper end cover through the structure of the liner 500. The supporting force of the cover body can also be customized according to actual requirements through other structures such as bolts and the like.

The maintenance cap 130 is installed on the top of the upper cap 100, and the water pipe 200 and the decorative cap 140 are installed on the maintenance cap 130. Welding can be used between the upper end cap 100 and the water pipe 200.

Since the electric water heater includes the water outlet pipe and the water inlet pipe, two decorative covers 140 are correspondingly arranged on the top of the maintenance cover 130. The two decorative covers 140 are red and blue, the red decorative cover 140 is sleeved on the water outlet pipe, and the blue decorative cover 140 is sleeved on the water inlet pipe 200 for identifying the water inlet pipe and the water outlet pipe.

The water inlet pipe is externally connected with a cold water pipe and is used for conveying cold water to the inner container, and the water outlet pipe is externally connected with a hot water pipe and is used for outputting hot water outwards.

For example, the shell is generally made of plastic materials so as to meet design requirements of attractive and diversified shapes; the inner container can be a metal container body or a plastic container body according to the requirement. For the liner adopting the metal liner body, the inside of the liner is easy to corrode due to the influence of water quality, so that a magnesium rod can be arranged and inserted into a water storage cavity in the water tank.

Since magnesium is the lowest potential metal in the electrochemical sequence, it is physiologically non-toxic. Therefore, the magnesium rod protective liner is very ideal to be used for manufacturing the magnesium rod protective liner. The size of the magnesium rod is directly related to the time of protecting the liner and the protecting effect, and the larger the magnesium rod is, the better the protecting effect is and the longer the protecting time is.

Illustratively, a heating pipe is further installed inside the housing 400, and the heating pipe may be disposed at the upper, middle and lower portions of the liner 500, and the heating pipe installed at the lower portion needs to be maintained only after the housing 400 is opened, which is inconvenient to maintain. Therefore, in the present embodiment, the decoration cover 140 is preferably installed at the upper portion and the middle portion of the liner 500, and the maintenance cover 130 is only required to be removed and opened for maintenance.

In the above technical scheme, for the electric heating component, electric heating modes such as electric heating wires, magnetic energy or silicon tube heating can be adopted to heat the water stored in the water storage cavity.

In the above technical scheme, inlet tube and outlet pipe stretch into from the top of inner bag 500, and the water inlet of inlet tube is close to the bottom of inner bag 500, and the delivery port of outlet pipe is close to the inner bag 500 top, because hot water distributes on the upper portion of inner bag 500, cold water distributes the lower part of inner bag 500, consequently can avoid cold water to get into the outlet pipe, guarantees the stability of outlet pipe temperature, improves user's experience.

In the above technical solution, the insulation layer 300 is disposed at the gap between the casing and the liner 500. The common heat insulation materials are as follows: asbestos, sponge, foam, polyurethane foam, etc., and in order to obtain a good heat-insulating effect, in the conventional technology, a heat-insulating layer is usually formed by adopting a foaming mode.

In the above technical scheme, the shell is further provided with a control device and a display device, and the control device is used for receiving detection signals sent by related sensors (such as a water temperature sensor and a flow sensor) and controlling the electric heating component to be powered on and powered off. The display device is used for displaying the temperature, the working state and the like of the electric water heater, the control device and the display device belong to the relatively mature prior art, and the embodiment is not repeated.

When kitchen water flows to the top of the electric water heater, most of the water is discharged through the top of the upper cap 100, and a small portion of the water may be collected at a gap of a contact position of the water pipe 200 and the decorative cover 140 or a gap of a contact position of the upper cap 100 and the service cover 130 through the water pipe 200, and if the sealing ring 110 is not provided, the water may enter the inside of the water heater from the two gaps, thereby damaging components.

In the utility model, after the two gaps are blocked by the sealing rings, water can only flow away through the top of the upper end cover 100, so that the waterproof effect of the electric water heater is improved, and the safety of the internal components of the electric water heater is ensured.

When the electric water heater in the embodiment needs to be maintained, the maintenance cover is only required to be opened to pass through the circular notch in the middle of the upper end cover for maintenance. Therefore, the electric water heater adopting the waterproof structure in the application not only has good waterproof performance, but also is very convenient and fast in maintenance.

While the present application has been described in connection with the preferred embodiments illustrated in the accompanying drawings, it will be readily understood by those skilled in the art that the scope of the application is not limited to such specific embodiments, and the above examples are intended to illustrate the technical aspects of the application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A waterproof structure, characterized by comprising: the water pipe sequentially passes through the upper end cover and the maintenance cover;

the decorative cover is sleeved on the water pipe and is positioned at the top of the maintenance cover;

the sealing ring is arranged at the contact position of the annular bulge of the upper end cover and the extension part, and the contact position of the decorative cover and the water pipe.

2. The waterproof structure according to claim 1, wherein the outer wall of the water pipe is provided with a water pipe annular groove, the sealing ring is located in the water pipe annular groove, and the sealing ring is attached to the inner wall of the decorative cover.

3. The waterproof structure according to claim 2, wherein the decorative cover bottom is provided with a decorative cover annular groove, the repair cover top is provided with a repair cover annular projection, and the decorative cover annular groove is buckled on the repair cover annular projection.

4. The waterproof structure according to claim 1, wherein the extension is located outside the upper end cover annular protrusion, and the seal ring is respectively attached to the extension and the upper end cover annular protrusion.

5. The waterproof structure of claim 1, wherein the top surfaces of the upper end cover and the decorative cover are both inclined surfaces.

6. The waterproof structure according to claim 1, wherein the upper end cover is circular or square.

7. The waterproof structure of claim 1, wherein the upper end cover is connected with the maintenance cover by a screw.

8. The waterproof structure according to any one of claims 1 to 7, wherein the material of the seal ring is silicone rubber, EPDM, PVC or polyurethane.

9. The waterproof structure according to any one of claims 1 to 7, wherein the cross-sectional shape of the seal ring is a circle, a polygon or a gear shape.

10. A water heater comprising a housing and a liner disposed within the housing, the top of the housing being provided with a water resistant structure as claimed in any one of claims 1 to 9.

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