CN111998529A

CN111998529A - Water storage container, electric water heater and manufacturing method of water tank of water heater

Info

Publication number: CN111998529A
Application number: CN201910446477.5A
Authority: CN
Inventors: 敖凯平; 陆智慧; 马学勇
Original assignee: AO Smith China Water Heater Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-11-27
Anticipated expiration: 2039-05-27
Also published as: CN111998529B

Abstract

The application discloses a manufacturing approach of water storage container, electric water heater and water heater water tank, wherein, a water storage container includes: a cylindrical main body; an end cap; an annular connection structure; the annular connecting structure is annularly sleeved between the end cover and the cylindrical main body; a sealing welding part is arranged between the annular connecting structure and the cylindrical main body, and the cylindrical main body and the end cover are fixedly installed; the end cap protrudes outward from the cylindrical body; the inner wall of the container is covered with an anti-corrosion layer; and a reinforcing welding part is also arranged between the annular connecting structure and the outer wall of the end cover. The water storage container, the electric water heater and the manufacturing method of the water tank of the water heater can be installed in a mode that the end cover protrudes outwards under the condition that the water storage container, the electric water heater and the manufacturing method of the water tank of the water heater are suitable for the enamel spraying process.

Description

Water storage container, electric water heater and manufacturing method of water tank of water heater

Technical Field

The application relates to the field of pressure containers, in particular to a water storage container;

the application also relates to the field of hot water equipment, in particular to an electric water heater and a manufacturing method of a water tank of the water heater.

Background

Electric water heaters typically have a liner and a heating rod. The heating rod heats water in the inner container to supply hot water to the user. The inner wall of the inner container is provided with enamel. In order to cover the inner wall of the inner container completely by enamel, the end covers on both sides of the inner container are usually installed in a convex-concave manner, wherein one end cover protrudes outwards from the inner container, and the other end cover is inwards recessed into the inner container.

Although the design can ensure that the inner wall of the inner container can fully cover enamel by utilizing the enamel spraying process, the volume of the inner container can be reduced. For having the water storage capacity of preferred, need do big with inner bag outside volume, lead to the bulk material to use more, promote manufacturing cost to, still lead to the heat radiating area of inner bag big, the heat preservation effect is not good.

Disclosure of Invention

In view of the deficiencies of the prior art, an object of the present invention is to provide a water storage container, an electric water heater and a method for manufacturing a water tank of a water heater, so as to increase the water storage space of the water storage container, thereby facilitating to reduce the external volume of the whole water storage container, saving the manufacturing material and reducing the manufacturing cost.

It is another object of the present application to provide a water storage container, an electric water heater, and a method of manufacturing a water tank for a water heater that can be installed with an end cap in an outwardly protruding form in a state suitable for an enameling process.

In order to achieve the purpose, the technical scheme of the application is as follows:

a water storage container comprising: a cylindrical main body; an end cap; an annular connection structure;

the annular connecting structure is annularly sleeved between the end cover and the cylindrical main body; a sealing welding part is arranged between the annular connecting structure and the cylindrical main body, and the cylindrical main body and the end cover are fixedly installed; the end cap protrudes outward from the cylindrical body; the inner wall of the container is covered with an anti-corrosion layer; and a reinforcing welding part is also arranged between the annular connecting structure and the outer wall of the end cover.

As a preferred embodiment, the annular connecting structure and the end cover are of an integral structure, and the annular connecting structure is formed by flanging the end cover outwards; the annular connecting structure comprises a bending section and a connecting section, the bending section is bent outwards from the opening end of the end cover, the connecting section extends towards the opposite direction from the opening end of the end cover, and the reinforcing welding part is used for connecting the connecting section with the end cover.

As a preferred embodiment, the annular connecting structure, the end cover and the cylindrical main body are of a split structure;

the sealing welding part comprises a welding seam formed by connecting one end of the annular connecting structure with the end part of the end cover and a welding seam formed by connecting the surface of the annular connecting structure back to the end cover with one end of the cylindrical main body; the reinforced welding part is used for connecting the other end of the annular connecting structure with the outer wall of the end cover.

As a preferred embodiment, part of the end cap extends into the cylindrical main body; the annular connecting structure is provided with an attaching surface facing the inner wall of the cylindrical main body, and the attaching surface to the inner surface of the end cover is continuously covered by an anti-corrosion layer; the inner wall of the cylindrical main body is covered with an anti-corrosion layer.

the annular connecting structure is annularly sleeved between the end cover and the cylindrical main body; a sealing welding part is arranged between the annular connecting structure and the end cover, the cylindrical main body and the end cover are fixedly installed, and the end cover protrudes outwards out of the cylindrical main body; the inner wall of the container is covered with an anti-corrosion layer; and a reinforcing welding part is also arranged between the annular connecting structure and the cylindrical main body.

As a preferred embodiment, an enclosed space is formed between the connecting structure and the end cap or the cylindrical body; the enclosed space is an unsealed space.

In a preferred embodiment, the circumferential length of the reinforcement welding portion is 0.5 to 1 times the circumferential length thereof.

As a preferred embodiment, the annular connecting structure and the cylindrical main body are an integral structure, the annular connecting structure is formed by flanging the cylindrical main body outwards, and comprises a bending section bending outwards from the opening end of the cylindrical main body and a connecting section extending from the bending section along the opening direction of the end cover, and the reinforcing welding part connects the connecting section and the cylindrical main body.

the sealing welding part comprises a first welding line and a second welding line, wherein one end of the annular connecting structure is connected with the end part of the cylindrical main body, and the surface of the annular connecting structure back to the cylindrical main body is connected with one end of the end cover; the reinforcement welding part connects the other end of the annular connection structure with the outer wall of the cylindrical main body.

In a preferred embodiment, the reinforcement weld comprises a plurality of reinforcement weld segments arranged in the circumferential direction, a gap hole is formed between two adjacent reinforcement weld segments, and the surrounding space is communicated with the atmosphere through the gap hole.

In a preferred embodiment, the plurality of reinforcement bead segments are uniformly distributed in the circumferential direction, and each reinforcement bead segment has an equal length.

In a preferred embodiment, the reinforced welding part comprises a welding seam continuously extending along the circumferential direction, and the connecting section is provided with a plurality of communicating holes communicated with the atmosphere.

As a preferred embodiment, a portion of the cylindrical body extends into the end cap; the annular connecting structure is provided with an attaching surface facing the inner wall of the end cover, and the attaching surface is continuously covered by an anti-corrosion layer from the attaching surface to the inner surface of the cylindrical main body; and the inner wall of the end cover is covered with an anti-corrosion layer.

In a preferred embodiment, the length of the connecting section is 8mm or more.

As a preferred embodiment, the water storage container comprises a storage water heater tank; the corrosion protection layer comprises an enamel layer.

An electric water heater comprising: the water heater comprises a liner, an electric heating part for heating water in the liner, and a water inlet pipe and a water outlet pipe which are provided with the liner; the inner container is the water storage container in any one of the above embodiments.

A method of manufacturing a water heater tank, the water heater tank comprising a cylindrical body, a first end cap, a second end cap; the end part of the first end cover is flanged outwards to form an annular connecting structure; the manufacturing method comprises the following steps:

fixedly mounting the second end cap to one end of the cylindrical body in a manner that the second end cap protrudes outward from the cylindrical body;

enamelling the inner walls of the cylindrical body and the second end cap;

enamelling the inner surface of the first end cap and the annular connection;

and fixedly mounting the second end cover on one end of the cylindrical main body in a mode of outwards protruding the cylindrical main body.

As a preferred embodiment, before enameling the inner surface of the first end cap and the annular connection structure, the method further includes the steps of: and welding the annular connecting structure and the outer wall of the first end cover to form a reinforcing welding part.

Has the advantages that:

the water storage container in this embodiment can realize that the end cover outwards protrudes the end of the cylindrical main body by being provided with the annular connecting structure, so that the end covers at the two ends of the cylindrical main body can outwards protrude, the water storage space of the water storage container is improved, the external volume of the whole water storage container is favorably reduced, the manufacturing material is saved, and the manufacturing cost is reduced.

Further, by providing the annular connection structure, the cylindrical body and the end cap with the annular connection structure can be coated with the corrosion prevention layer in advance and then assembled to one end of the cylindrical body (for example, by spraying, etc.), and the cylindrical body and the annular connection structure can be welded to form the seal welded portion without damaging the corrosion prevention layer on the inner wall of the end cap.

In addition, the water storage container in the embodiment can keep the sealing welding part at a certain distance from the inner wall of the end cover along the vertical direction and at a certain distance from the inner wall of the water storage space along the horizontal direction (the length direction of the cylindrical main body), so that the corrosion-resistant layer (enamel) is prevented from being damaged by porcelain explosion when the welding is carried out at high temperature.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a water storage container provided in an embodiment of the present application;

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

FIG. 3 is a front view of the reinforcement weld of FIG. 2;

FIG. 4 is an elevation view of a reinforced weld of another embodiment of the present application;

FIG. 5 is a schematic view of the welding of an end cap to a cylindrical body according to another embodiment of the present application;

FIG. 6 is a schematic view of a water storage container according to another embodiment of the present disclosure;

FIG. 7 is an enlarged schematic view of portion B of FIG. 6;

FIG. 8 is a schematic view of the welding of an end cap to a cylindrical body according to another embodiment of the present application;

FIG. 9 is a schematic flow chart of a method of manufacturing a water heater tank provided by one embodiment of the present application;

FIG. 10 is a graph of the results of a static pressure test without a reinforcement weld;

FIG. 11 is a graph of the results of a static pressure test using the embodiment of FIGS. 1-3;

FIG. 12 is a graph showing the results of a pressure test in which the length of the reinforcement weld is less than 50% of the circumference;

fig. 13 is a graph showing the results of a pressure test in which the enclosed space is a closed space.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1 to 3. The present application provides in one embodiment a water storage container that may find application in, but is not limited to, water heaters, and in particular may be used as a tank (also referred to as a bladder) for an electric water heater. Wherein, this water storage container can include: a cylindrical main body 1; an end cap 2; a ring-shaped connecting structure 3.

The annular connecting structure 3 is sleeved between the end cover 2 and the cylindrical main body 1. And a sealing welding part 5 is arranged between the annular connecting structure 3 and the cylindrical main body 1, and the cylindrical main body 1 and the end cover 2 are fixedly installed. The end cap 2 protrudes outwards from the cylindrical body 1; the inner wall of the container is covered with an anti-corrosion layer 4. In this embodiment, the water storage container may comprise a storage-type water heater tank. At this time, the corrosion prevention layer 4 may include an enamel layer.

Considering that when the water storage container is applied to a water tank of a water heater, the water tank is used as a pressure-bearing container, and when water continuously enters and exits, the whole water storage container, especially the annular connecting structure 3 part, can bear pulse type impact load, in order to strengthen the end cover 2 to resist the impact of the internal pressure (static pressure) and the pulse pressure (dynamic pressure) of the water storage container, prevent the end cover 2 (especially the part between the annular connecting structure 3 and the end cover 2) from deforming, and avoid damaging the sealing effect of the anti-corrosion layer 4 and the sealing welding part 5, the annular connecting structure 3 and the outer wall of the end cover 2 are also provided with the strengthening welding part 6.

The water storage container in the embodiment is provided with the annular connecting structure 3, so that the end cover 2 is arranged at the end part of the tubular main body 1 in a mode of protruding the tubular main body 1 outwards, the end covers 2 and 10 at the two ends of the tubular main body 1 can protrude outwards, the water storage space 11 of the water storage container is improved, the external volume of the whole water storage container is favorably reduced, the manufacturing material is saved, and the manufacturing cost is reduced.

Further, by providing the annular connecting structure 3, the cylindrical body 1 and the end cap 2 with the annular connecting structure 3 can be coated with the corrosion prevention layer 4 in advance, and then the end cap 2 can be assembled to one end of the cylindrical body 1, and the cylindrical body 1 and the annular connecting structure 3 can be welded to form the seal welded portion 5 without damaging the corrosion prevention layer 4 (e.g., enamel) on the inner wall of the end cap 2.

The water storage container in this embodiment can be with sealed welding portion 5 along the inner wall certain distance of vertical direction and end cover 2 through being equipped with annular connection structure 3 to and along the inner wall certain distance of horizontal direction (the length direction of tube-shape main part 1) and water storage space 11, avoid anticorrosive coating 4 (enamel) to meet welding high temperature and appear the porcelain explosion destruction, thereby can spray before the welding and ward off, and can not destroyed when the welding.

The above effects can also be seen from the experimental results shown in fig. 10 and 11. It is shown in fig. 10 that when the reinforcing welding part 6 is not present, after the 300PSI static pressure test is performed, the inner wall of the end cover 2 is subjected to large-area porcelain explosion, and the enamel is damaged and cannot be used continuously. And in fig. 11 with the reinforcing welding part 6, the enamel is not damaged after the static pressure test of 300PSI, so that the reinforcing welding part 6 can protect the enamel of the end cover 2 from being damaged by pressure.

In this embodiment, the

end caps

2 and 10 at both ends of the water storage container can be protruded outwards to form a double-convex inner container when applied to an electric water heater. The cylindrical body 1 may be cylindrical, and both ends of the cylindrical body 1 may be provided with

end caps

2 and 10 protruding outward. Wherein, the one end of tube-shape main part 1 can directly be welded with end cover 10 directly, need not to adopt annular connection structure 3, and the other end is connected with end cover 2 through annular connection structure 3.

Through actual comparison, compared with a 'one-convex-one-concave' inner container (water tank), the length of the whole water tank of the 'double-convex' structure is reduced by 105mm under the condition of equal volume, the height of the whole machine is reduced by 52mm, the installation is flexible, and the manufacturing cost can be effectively reduced. In addition, under the same capacity and heat preservation measures, the energy efficiency can be improved from 0.54 to 0.56, and the heat preservation performance is very excellent.

In the present embodiment, the water storage container has a water storage space 11. The seal welding portion 5 assembles the end cap 2 and the cylindrical body 1 to form the water storage space 11. The reinforced welding part 6 welds the annular connecting structure 3 and the end cover 2 without participating in forming the water storage space 11. Strengthen the structural strength that welding portion 6 can promote between annular connection structure 3 and the end cover 2, promote structural stability, prevent to form the moment of torsion and damage anti-corrosion coating 4, promote water storage container's life between annular connection structure 3 and the end cover 2 under static pressure and pulse pressure.

In order to avoid damaging the anti-corrosion layer 4 (such as an enamel layer) on the inner wall of the end cover 2 during welding, the end cover 2 is separated from the seal welding part 5 by the annular connecting structure 3, so that enamel damage caused by direct welding of the end cover 2 and the cylindrical main body 1 is avoided, and the integrity of the anti-corrosion layer 4 on the inner wall of the container is ensured.

When the water storage container in the embodiment is applied to an electric water heater, the enamel spraying process can be directly adopted for enamel spraying, and the enamel process does not need to be changed. By providing the annular connecting structure 3, the vessel can be enamelled on the inner wall of the vessel using an enamelling process. The reinforcing weld 6 is welded prior to the seal weld 5 connecting the tubular body 1 and the annular connecting structure 3.

In this embodiment, one end 22 of the end cap 2 extends into the cylindrical body 1, part of the end cap 2 is located at the innermost layer, the annular connecting structure 3 is located at the middle layer, and part of the cylindrical body 1 is located at the outermost layer. In order to strengthen the structural strength of the end cover 2 by the reinforcing welding part 6 and improve the anti-explosion porcelain effect, the circumferential length of the reinforcing welding part 6 is 0.5-1 time of the circumferential length of the reinforcing welding part. When the circumference length of the reinforcement welding part 6 is equal to the circumferential length thereof, the reinforcement welding part 6 continuously extends in the circumferential direction to form a circular-ring-shaped weld. An annular connecting structure 3 is located between the end cap 2 and the cylindrical body 1.

As shown in fig. 12, when the length of the reinforcement weld 6 is less than 50% of the circumferential length thereof, the portion between the annular connection structure 3 and the end cap 2 without the reinforcement weld 6 has a porcelain collapse problem after 10 ten thousand pulse tests. Referring again to fig. 11, when the circumferential length of the reinforced welding part 6 is 0.5-1 times of the circumferential length, the enamel on the end cover 2 and the annular connecting structure 3 still remains intact after the pulse test.

It can be seen through the above-mentioned test that strengthen welding portion 6 and need keep certain length, just can play the stable structure effect of preferred to avoid the edge of end cover 2 to collapse porcelain (enamel destruction). However, an enclosing space 7 is formed between the annular connection 3 and the end cap 2. The reinforcement welds 6 close off the end of the enclosure 7 remote from the interior of the vessel. The enclosed space 7 is completely sealed when the length of the reinforced welding part 6 is equal to the length of the circumference (continuous annular welding line), according to the above test results, it should provide better structural strength and have the best enamel damage prevention effect, but the actual test results show that as shown in fig. 13, when the annular connecting structure 3 and the cylindrical main body 1 are welded or the annular connecting structure 3 and the end cover 2 are enameled, a problem of enamel falling of a large area on the annular connecting structure 3 occurs.

Further research shows that after the reinforcing welding part 6 has the maximum length and completely blocks the port of the surrounding space 7, the surrounding space 7 forms a closed space, cannot be communicated with the outside, and cannot be exhausted outwards. When the annular connection structure 3 and the cylindrical body 1 are welded or enameled, the gas in the closed space is expanded due to the high temperature of the welding or the enamel, and the enamel surrounding the enclosed space 7 is broken due to the hydrogen evolution and porcelain explosion phenomenon. Thus, to prevent hydrogen evolution from exploding the porcelain, the enclosure 7 is provided as an unsealed space. The surrounding space 7 communicates with the outside. The test result of the enclosed space 7 being an unsealed space is shown in fig. 11, and the enamel remains intact and is not damaged when the annular connection structure 3 is connected to the cylindrical body 1.

In the present embodiment, the surrounding space 7 is a non-closed space, which can be shortened by providing the communication gap 8 or the communication hole on the reinforcement welding portion 6, or can be directly provided with the communication hole (not shown) communicating with the outside on the annular connecting structure 3. Specifically, as shown in fig. 2, the reinforcement weld 6 may include a plurality of reinforcement bead segments arranged along the circumferential direction, and a gap 8 is formed between two adjacent reinforcement bead segments. The surrounding space 7 is in communication with the outside (atmosphere) via the gap 8. In this embodiment, the reinforcement welds 6 are welds that extend intermittently in the circumferential direction.

For better structural stability, a plurality of reinforcing weld segments are uniformly distributed along the circumferential direction to form a plurality of clearance holes. Each reinforcement weld segment is of equal length. In this embodiment, the length of the weld (total weld length) of the reinforcement weld 6 in the circumferential direction is smaller than the circumference of the circumference, but greater than 0.5 times the circumference of the circumference. In another embodiment, as shown in fig. 4, the communication gap 8 may be one, and the reinforcement weld 6 is a weld continuously extending in the circumferential direction.

As shown in fig. 2, a part of the end cap 2 protrudes into the cylindrical body 1. The annular connecting structure 3 has an abutting surface 33 facing the inner wall of the cylindrical body 1, the abutting surface 33 being continuously covered by the corrosion prevention layer 4 to the inner surface of the end cap 2. The inner wall of the cylindrical body 1 is covered with an anti-corrosion layer 4. The abutment surface 33 may be enamelled before welding. The corrosion-proof layer 4 of the bonding surface 33 and the corrosion-proof layer 4 of the inner wall of the tubular body 1 are bonded to each other to form a sealed structure, and the corrosion-proof layer 4 for protecting the water storage space 11 is broken when welded by the seal-welded portion 5.

In this embodiment, the annular connecting structure 3 is located partly outside the tubular body 1 and partly inside the tubular body 1. Part of the joint surface 33 is exposed, and part of the joint surface 33 is jointed with the inner surface of the cylindrical main body 1 to form a transition area from the sealing welding part 5 to the inside of the water storage space 11, so that the enamel in the water storage space 11 is prevented from being damaged due to welding influence when the annular connecting structure 3 is welded with the cylindrical main body 1. The surface of the cylindrical main body 1, which is relatively attached to the attaching surface 33, is also covered with enamel, and the annular connecting structure 3 and the enamel transition area of the cylindrical main body 1 are formed after the cylindrical main body and the attaching surface are opposite, so that the inner enamel of the water storage container can be protected from being damaged by welding during welding.

In another embodiment, as shown in fig. 6 and 7, the annular connection structure 3 may be entirely located inside the tubular body 1, and an end portion of the annular connection structure 3 may be welded to an inner wall of the tubular body 1 to form the seal-welded portion 5. At this time, a part of the end cap 2 together with the annular connecting structure 3 protrudes into one end of the cylindrical body 1.

In the embodiment of the present application, the annular connecting structure 3 and the end cap 2 may be an integral structure or a separate structure. In this embodiment, the annular connecting structure 3 and the end cap 2 are of a unitary structure. The annular connecting structure 3 is formed by flanging the end cover 2 outwards. The end cover 2, the cylindrical main body 1 and the annular connecting structure 3 form a laminated structure, and the annular flanging structure which is formed by flanging outwards is located between the end part of the end cover 2 and the end part of the cylindrical main body 1. The annular connecting structure 3 is formed by flanging the end cover 2, so that the welding times can be reduced, and the processing and the manufacturing are convenient.

Specifically, the open end of the end cap 2 faces the cylindrical body 1. The annular connecting structure 3 comprises a bending section 31 bending outwards from the opening end of the end cover 2, and a connecting section 32 extending from the bending section 31 along the opening end of the end cover 2 in the opposite direction. The bent section 31 may have a semicircular cross-sectional configuration, which may allow the end cap 2 to be bent 180 degrees to form the annular connecting structure 3. The end cap 2 may have parallel sections parallel to the connecting section 32. The enclosure 7 is located between the parallel section and the connecting section 32. The reinforcement weld 6 connects the connecting section 32 and the end cap 2. The bent sections 31 and the reinforcement welds 6 are located at the inner and outer ends of the enclosed space 7. The abutment surface 33 is located on the upper surface of the connection end. In order to have a good protection against damage to the enamel, the length (in the longitudinal direction of the tubular body 1) of the connecting section 32 is 8mm or more.

In one embodiment, the reinforcement weld 6 comprises a weld bead extending continuously in the circumferential direction. The reinforced welding part 6 is not provided with a communication hole, is a continuous annular welding line and completely seals the port of the surrounding space 7 far away from the water storage space 11. In order to make the surrounding space 7 a non-closed space, a plurality of communication holes communicated with the atmosphere can be arranged at the connecting section 32 of the annular connecting structure 3. Specifically, a portion of the connection segment 32 located outside the cylindrical body 1 is provided with a communication hole, that is, a portion of the connection segment 32 located outside the seal-welded portion 5 is provided with a communication hole that can penetrate the annular connection structure 3 in the vertical direction.

Of course, in a possible embodiment, as shown in fig. 8, the annular connecting structure 3, the end cap 2 and the cylindrical body 1 are of a split structure, and the three are assembled by welding to form the water storage container. Wherein, the connecting ring (annular connecting structure 3) is annularly sleeved between the end cover 2 and the cylindrical main body 1. The seal welding part 5 comprises a first welding seam 52 and a second welding seam 51, wherein one end of the annular connecting structure 3 is connected with the end part of the end cover 2, and the surface (attaching surface 33) of the annular connecting structure 3, which is back to the end cover 2, is connected with one end of the cylindrical main body 1.

Wherein the first welding line 52 and the second welding line 51 are used for assembling the water storage space 11 forming the water storage container. The first weld 52 is welded prior to the second weld 51. After the first welding line 52 is formed, a spraying process is required, and then the second welding line 51 is formed by welding, so that the end cover 2 is assembled on the cylindrical body 1 to form the water storage container.

The reinforcement weld 6 connects the other end of the annular connecting structure 3 with the outer wall of the end cap 2. The cross section of the annular connecting structure 3 and the cross section of the end cover 2 are formed to be similar to a U-shaped cross section, an enclosing space 7 is formed between the annular connecting structure and the end cover, and a reinforcing welding part 6 is arranged at one end of the enclosing space 7 far away from the cylindrical main body 1 to partially or completely close the opening of the enclosing space 7.

In the embodiment of the above-mentioned annular connection structure 3 and end cover 2 integrated structure, only the second welding seam is needed to realize the assembly of the end cover 2 and the cylindrical main body 1, and the water storage space 11 of the water storage container is formed.

Please refer to fig. 5. Another embodiment of the present application further provides a water storage container, including: a cylindrical main body 1; an end cap 2; a ring-shaped connecting structure 3. Wherein the annular connecting structure 3 is sleeved between the end cover 2 and the cylindrical main body 1; a sealing welding part 5 is arranged between the annular connecting structure 3 and the end cover 2, the cylindrical main body 1 and the end cover 2 are fixedly installed, and the end cover 2 protrudes outwards from the cylindrical main body 1; the inner wall of the container is covered with an anti-corrosion layer 4; a reinforcing welding part 6 is also arranged between the annular connecting structure 3 and the cylindrical main body 1. The water storage container comprises a water storage type water heater tank. The corrosion protection layer 4 comprises an enamel layer.

In this embodiment, one end 11 of the tubular body 1 extends into the end cap 2, the tubular body 1 being located at the innermost layer, the annular connection structure 3 being located at the middle layer, and the end cap 2 being located at the outermost layer. An enclosed space 7 is formed between the annular connecting structure 3 and the cylindrical body 1. An annular connecting structure 3 is located between the end cap 2 and the cylindrical body 1.

It should be noted that, in the present embodiment, the cylindrical main body 1, the end cover 2, the annular connecting structure 3, the seal welding portion 5, the reinforcement welding portion 6, and the surrounding space 7 may refer to the description in any one of the above embodiments, and repeated descriptions or direct references in this embodiment are omitted.

As shown in fig. 5, a part of the cylindrical body 1 protrudes into the end cap 2. The annular connecting structure 3 has an abutting surface 33 facing the inner wall of the end cap 2, the abutting surface 33 being continuously covered by the corrosion protection layer 4 to the inner surface of the cylindrical body 1. The inner wall of the end cover 2 is covered with an anti-corrosion layer 4. The abutment surface 33 may be enamelled before welding. The corrosion-proof layer 4 of the bonding surface 33 and the corrosion-proof layer 4 of the inner wall of the end portion of the end cover 2 are bonded to each other to form a sealed structure, and the corrosion-proof layer 4 for protecting the water storage space 11 is broken when being welded by the seal-welded portion 5.

In this embodiment, the annular connecting structure 3 is located partly outside the end cap 2 and partly inside the end cap 2. Part of the attaching surface 33 is exposed, and part of the attaching surface 33 is attached to the inner surface of the end cover 2 to form a transition area from the sealing welding part 5 to the water storage space 11, so that the enamel in the water storage space 11 is prevented from being damaged due to welding influence when the annular connecting structure 3 and the end cover 2 are welded. The surface of the cylindrical main body 1, which is relatively attached to the attaching surface 33, is also covered with enamel, and the annular connecting structure 3 and the enamel transition area of the end cover 2 are formed after the cylindrical main body and the attaching surface are opposite, so that the enamel in the water storage container can be protected from being damaged by welding during welding.

Similar to the embodiment shown in fig. 6 and 7. In other embodiments, the annular connecting structure 3 may be located entirely within the end cap 2, and the end of the annular connecting structure 3 may be welded to the inner wall of the end cap 2 to form the seal weld 5. At this time, the partially cylindrical body 1 with the annular connecting structure 3 protrudes into the open end of the end cap 2.

In the embodiment of the present application, the annular connecting structure 3 and the cylindrical body 1 may be an integral structure or a separate structure. In the present embodiment, as shown in fig. 5, the annular connecting structure 3 is an integral structure with the cylindrical body 1. The annular connecting structure 3 is formed by flanging the cylindrical main body 1 outwards, and comprises a bent section 31 bent outwards from the open end of the cylindrical main body 1 and a connecting section 32 extending from the bent section 31 along the opening direction of the end cover 2, and the reinforcing welding part 6 connects the connecting section 32 with the cylindrical main body 1. The length of the connecting section 32 is more than 8 mm.

The reinforcement weld 6 comprises a plurality of reinforcement weld segments arranged in the circumferential direction. A gap 8 is formed between two adjacent reinforcing weld joint sections, and the surrounding space 7 is communicated with the atmosphere through the gap 8. The plurality of reinforcing weld joint sections are uniformly distributed along the circumferential direction, and the length of each reinforcing weld joint section is equal. The reinforcement weld 6 comprises a weld extending continuously in the circumferential direction, and the connecting section 32 is provided with a plurality of communicating holes communicating with the atmosphere.

Part of the cylindrical body 1 extends into the end cap 2. The annular connecting structure 3 has an abutting surface 33 facing the inner wall of the end cap 2, the abutting surface 33 being continuously covered by the corrosion protection layer 4 to the inner surface of the cylindrical body 1; the inner wall of the end cover 2 is covered with an anti-corrosion layer 4.

In another embodiment, the annular connecting structure 3, the end cap 2 and the cylindrical body 1 are both of a split structure. The sealing welding part 5 comprises a welding seam formed by connecting one end of the annular connecting structure 3 with the end part of the cylindrical main body 1 and a welding seam formed by connecting the surface of the cylindrical main body 1 back to the annular connecting structure 3 with one end of the end cover 2. The reinforcing weld 6 connects the other end of the annular connecting structure 3 to the outer wall of the tubular body 1. The annular connecting structure 3 can be welded with the cylindrical main body 1, then the anti-corrosion layer 4 is covered, and then the annular connecting structure is welded with the end cover 2 to form the sealing welding part 5. In this embodiment, reference may be made to the description in the embodiment shown in fig. 8, and details in this embodiment are not repeated.

The embodiment of the present application further provides an electric water heater, including: the water heater comprises a liner, an electric heating part for heating water in the liner, and a water inlet pipe and a water outlet pipe which are provided with the liner; the inner container adopts the water storage container in any one of the embodiments.

Please refer to fig. 9. An embodiment of the present application further provides a method of manufacturing a water tank of a water storage type water heater, the water tank of the water storage type water heater comprising a cylindrical main body, a first end cap, a second end cap; the end part of the first end cover is flanged outwards to form an annular connecting structure. Of course, the manufacturing method provided by this embodiment may be applied to manufacture the water storage container in any one of the above embodiments. The application is not limiting. Specifically, the manufacturing method comprises the following steps:

s100, fixedly mounting the second end cover on one end of the cylindrical main body in a mode of outwards protruding the cylindrical main body;

s200, enameling the inner walls of the cylindrical main body and the second end cover;

s300, enameling the inner surface of the first end cover and the annular connecting structure;

and S400, fixedly mounting the first end cover at the other end of the cylindrical main body in a mode of outwards protruding the cylindrical main body.

Wherein, the second end cap can be directly welded in the one end of tube-shape main part, and first end cap passes through annular connection structure and is connected with the tube-shape main part. The manufacturing method may further include the steps of: s150, welding the annular connecting structure and the outer wall of the first end cover to form a reinforcing welding part. The step S150 is executed before the step S200, but is not executed in a proper order with respect to the steps S100 and S200. Accordingly, steps S300, S100 and S200 are not executed in a clear sequence. This application is not intended to be limiting. In this step S150, the annular connection structure and the outer wall of the first end cap are welded together such that the enclosed space between the annular connection structure and the first end cap is a non-closed space.

In step S400, the cylindrical body and the annular connection structure are welded to form a seal-welded portion, and the first end cap is assembled to the cylindrical body. The end face of the cylindrical main body and the surface of the annular connecting structure back to the end cover are welded to form a sealing welding part, and a closed inner cavity of the water storage container is formed.

The first end cap, the cylindrical body, the annular connecting structure, the sealing weld portion, and the reinforcing weld portion may refer to the descriptions of the water storage container in the above embodiments, and are not repeated in this embodiment.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter disclosed herein is not intended to forego the contents of such a cylindrical body, nor should the inventors be aware that such subject matter is not considered part of the disclosed subject matter.

Claims

1. A water storage container, comprising: a cylindrical main body; an end cap; an annular connection structure;

2. A water storage container as claimed in claim 1, wherein said annular connecting structure is integral with said end cap, said annular connecting structure being formed by outwardly flanging said end cap; the annular connecting structure comprises a bending section and a connecting section, the bending section is bent outwards from the opening end of the end cover, the connecting section extends towards the opposite direction from the opening end of the end cover, and the reinforcing welding part is used for connecting the connecting section with the end cover.

3. A water storage container as claimed in claim 1, wherein said annular connection structure and said end cap and cylindrical body are of split construction;

4. A water storage container as claimed in claim 1, wherein part of said end cap extends into said cylindrical body; the annular connecting structure is provided with an attaching surface facing the inner wall of the cylindrical main body, and the attaching surface to the inner surface of the end cover is continuously covered by an anti-corrosion layer; the inner wall of the cylindrical main body is covered with an anti-corrosion layer.

5. A water storage container, comprising: a cylindrical main body; an end cap; an annular connection structure;

6. A water storage container as claimed in claim 1 or 5, wherein an enclosed space is formed between said connecting structure and said end cap or said cylindrical body; the enclosed space is an unsealed space.

7. A water storage tank as claimed in claim 1 or 5, wherein said reinforcement weld has a circumferential length which is 0.5 to 1 times the circumferential length of said reinforcement weld.

8. A water storage container as claimed in claim 5, wherein said annular connection structure is an integral structure with said cylindrical body, said annular connection structure is formed by flanging said cylindrical body and includes a bending section bending outwards from said open end of said cylindrical body and a connection section extending from said bending section along said open end of said end cap, said reinforcement weld connects said connection section with said cylindrical body.

9. A water storage container as claimed in claim 5, wherein said annular connection structure and said end cap and cylindrical body are of split type;

10. A water storage container as claimed in claim 6, wherein said reinforcement weld comprises a plurality of reinforcement weld segments arranged along the circumferential direction, a clearance hole is provided between two adjacent reinforcement weld segments, and said surrounding space is communicated with the atmosphere through said clearance hole.

11. A water storage tank as claimed in claim 10, wherein the plurality of reinforcing weld segments are evenly distributed along the circumferential direction, and each reinforcing weld segment has an equal length.

12. A water storage container as claimed in claim 2 or 8, wherein said reinforcing weld comprises a weld extending continuously in a circumferential direction, and said connecting section is provided with a plurality of communication holes communicating with the atmosphere.

13. A water storage container as claimed in claim 5, wherein part of said tubular body extends into said end cap; the annular connecting structure is provided with an attaching surface facing the inner wall of the end cover, and the attaching surface is continuously covered by an anti-corrosion layer from the attaching surface to the inner surface of the cylindrical main body; and the inner wall of the end cover is covered with an anti-corrosion layer.

14. A water storage tank as claimed in claim 2 or 8, wherein said connecting section is more than 8mm long.

15. A storage container as claimed in claim 1 or 5, wherein said storage container comprises a storage heater tank; the corrosion protection layer comprises an enamel layer.

16. An electric water heater, comprising: the water heater comprises a liner, an electric heating part for heating water in the liner, and a water inlet pipe and a water outlet pipe which are provided with the liner; the inner container is the water storage container as claimed in any one of claims 1 to 15.

17. The manufacturing method of the water tank of the water heater is characterized in that the water tank of the water heater comprises a cylindrical main body, a first end cover and a second end cover; the end part of the first end cover is flanged outwards to form an annular connecting structure; the manufacturing method comprises the following steps:

enamelling the inner walls of the cylindrical body and the second end cap;

enamelling the inner surface of the first end cap and the annular connection;

18. The method of manufacturing of claim 17, further comprising, prior to enamelling the inner surface of the first end cap and the annular connection structure, the steps of: and welding the annular connecting structure and the outer wall of the first end cover to form a reinforcing welding part.