Inner container for water heater, manufacturing method of inner container and water heater

Abstract

The embodiment of the invention provides an inner container for a water heater, a manufacturing method of the inner container and the water heater, the inner container comprises a cylinder body, the cylinder body is provided with a cylinder body welding seam, and the cylinder body welding seam is formed by melting materials of a body of the cylinder body; the first end cover and the second end cover are located at the two ends of the cylinder body respectively, and at least one of the first end cover and the second end cover is formed by spinning a body of the cylinder body. According to the embodiment of the invention, the barrel welding seam is formed by melting the barrel body, so that the material of the barrel welding seam is the same as that of the barrel, uniform deformation is generated on the surface of the barrel welding seam and the surface of the barrel in the spinning process, the barrel is prevented from wrinkling and cracking, the quality of the barrel is improved, and the production cost is reduced. A high-cost seamless steel pipe is not needed for spinning, and the quality of the inner container formed through spinning can be guaranteed; through the spinning process, the barrel and the at least one end cover do not need to be welded, the firmness between the barrel and the at least one end cover is guaranteed, and the service life of the inner container is prolonged.

Description

Technical Field

[0001] The embodiments of this specification relate to the technical field of water heater inner tanks, and in particular to an inner tank for a water heater, a manufacturing method thereof, and a water heater. Background Art

[0002] The existing inner tank of an electric water heater usually includes a tank body located in the middle and end covers located at both ends of the tank body. The tank body is obtained by rolling up two opposite sides of a plate and welding them together, and then the tank body is welded to the end covers on both sides; thus, three welds are usually formed on the inner tank. Since there are many welds on the entire inner tank, and there are connection points between the welds between the tank body and the end covers and the welds of the tank body itself, there are many welding procedures and complex processes, and problems such as poor welding, open welding, and leaking welding are prone to occur. At the welds where the above problems occur, there may be a risk of water leakage and the water heater being electrified, which seriously affects the safety of the electric water heater.

[0003] In order to solve the above-mentioned problems of multiple welds and intersections of welds, the prior art also uses an integrated bladder body, that is, the bladder body is made of seamless steel pipes, but the seamless steel pipes are expensive and difficult to promote on a large scale.

[0004] In view of this, the embodiments of this specification are intended to provide an inner tank for a water heater, a manufacturing method thereof, and a water heater. Summary of the invention

[0005] In view of the above-mentioned problems in the prior art, the purpose of the embodiments of this specification is to provide an inner tank for a water heater, a manufacturing method thereof, and a water heater, so as to solve the problems in the prior art that the inner tank of the water heater is expensive and the inner tank of the water heater is prone to leakage due to poor welding, open welding, and welding leakage, and then there is a risk of leakage and electrification.

[0006] In order to solve the above technical problems, the specific technical solutions of the embodiments of this specification are as follows:

[0007] In a first aspect, an embodiment of the present specification provides an inner tank for a water heater, the inner tank comprising:

[0008] A cylinder, wherein the cylinder has a cylinder weld, and the cylinder weld is formed by melting the material of the main body of the cylinder;

[0009] A first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, and at least one of the first end cover and the second end cover is formed by spinning the main body of the cylinder.

[0010] In a preferred embodiment, the material of the cylinder weld is the same as the material of the cylinder body.

[0011] In a preferred embodiment, both the first end cover and the second end cover are formed by spinning the main body of the cylinder.

[0012] In a preferred embodiment, the surface of the cylinder weld is lower than the surface of the cylinder, or the surface of the cylinder weld is flush with the surface of the cylinder.

[0013] In a preferred embodiment, the absolute value of the height difference between the surface of the cylinder weld and the surface of the cylinder is not greater than a preset value.

[0014] In a preferred embodiment, the preset value is 2 mm.

[0015] In a preferred embodiment, the cylinder weld is formed after the material of the cylinder body is melted by laser welding or argon arc welding.

[0016] In a preferred embodiment, the cylinder weld extends in a direction from the first end cover to the second end cover.

[0017] In a preferred embodiment, the first end cover has a first end cover weld; and / or

[0018] The second end cap has a second end cap weld.

[0019] In a preferred embodiment, the first end cover weld extends along the arcuate surface of the first end cover to the middle area of ​​the first end cover; and / or

[0020] The second end cover weld extends along the arcuate surface of the second end cover to a middle region of the second end cover.

[0021] In a preferred embodiment, the first end cover weld, the second end cover weld, and the cylinder weld are the same weld.

[0022] In a preferred embodiment, one end of the cylinder weld extends toward the first end cover to form the first end cover weld on the first end cover; and / or

[0023] The other end of the cylinder weld extends toward the second end cover, forming the second end cover weld on the second end cover.

[0024] In a preferred embodiment, at least a portion of the outer surface of the first end cover weld is smooth, and at least a portion of the inner surface of the first end cover weld is rough; and / or

[0025] At least a portion of the outer surface of the second end cover weld is smooth, and at least a portion of the inner surface of the second end cover weld is rough.

[0026] In a preferred embodiment, at least a portion of the wall thickness of the first end cover is greater than the wall thickness of the cylinder; and / or

[0027] At least a portion of the wall thickness of the second end cover is greater than the wall thickness of the cylinder.

[0028] In a preferred embodiment, the wall thickness of the cylinder is between 1.0 and 3.0 mm; and / or

[0029] The wall thickness of at least part of the first end cap and the wall thickness of at least part of the second end cap are between 1.0 and 20 mm.

[0030] In a preferred embodiment, the first end cover has an opening.

[0031] The surface of the first end cover comprises a first surface which is an arc surface, and a second surface which extends along the first surface to form an opening.

[0032] In a preferred embodiment, the opening is formed by machining.

[0033] In a preferred embodiment, the opening is an opening formed by spinning the main body of the cylinder.

[0034] In a preferred embodiment, at least one of the first end cover and the second end cover is spherical or ellipsoidal.

[0035] In a second aspect, the present specification also provides a method for manufacturing an inner tank of a water heater, the method comprising:

[0036] Roll the liner material into a cylindrical material;

[0037] Melting the main body of the cylindrical material to form a cylindrical body with a cylindrical body weld;

[0038] At least one end of the cylinder is spun to form an end cap of the cylinder.

[0039] In a preferred embodiment, after the step of melting the body of the cylindrical material to form a cylinder having a cylinder weld, the method further comprises:

[0040] The cylinder is cut into sections.

[0041] In a preferred embodiment, before the step of rolling the liner material into a cylindrical material, the method further comprises:

[0042] The inner liner material is cut into sections or a plate is used as the inner liner material.

[0043] In a preferred embodiment, the step of melting the main body of the cylindrical material to form a cylindrical body having a cylindrical body weld is specifically,

[0044] The main body of the cylindrical material is melted to form a cylindrical weld along the axial direction of the cylindrical material.

[0045] In a preferred embodiment, the step of spinning at least one end of the cylinder to form the end cap of the cylinder is specifically,

[0046] Both ends of the cylinder are spun to form a first end cap and a second end cap respectively.

[0047] In a preferred embodiment, the step of forming the first end cover and the second end cover is specifically to spin the two ends of the cylinder and the cylinder welds located at the two ends of the cylinder to form a first end cover with a first end cover weld and a second end cover with a second end cover weld.

[0048] In a preferred embodiment, when spinning is performed on both ends of the cylinder, at least a portion of the wall thickness of the first end cover is greater than the wall thickness of the cylinder; and / or

[0049] The wall thickness of at least a portion of the second end cover is greater than the wall thickness of the cylinder.

[0050] In a preferred embodiment, after the step of spinning at least one end of the cylinder to form an end cap of the cylinder, the method further comprises:

[0051] The middle region of the end cap is machined to have an opening.

[0052] In a preferred embodiment, the step of spinning at least one end of the cylinder to form an end cap of the cylinder is specifically, spinning one end of the cylinder to form a first end cap of the cylinder with an opening, and spinning the other end of the cylinder to form a second end cap of the cylinder.

[0053] In a preferred embodiment, the step of melting the main body of the cylindrical material to form a cylindrical body having a cylindrical body weld is specifically,

[0054] The first connecting edge and the second connecting edge of the inner liner material constituting the cylindrical material are butt-melted to form a cylindrical weld along the axial direction of the cylindrical material, so that the cylindrical material forms a cylindrical body with a closed annular cross-section.

[0055] In a third aspect, an embodiment of the present specification further provides a water heater, the water heater comprising an inner tank as provided in the above technical solution.

[0056] In a fourth aspect, an embodiment of the present specification further provides a water heater, the water heater comprising an inner tank manufactured by the method for manufacturing an inner tank for a water heater provided based on the above technical solution.

[0057] By adopting the above technical scheme, the inner tank for water heater and its manufacturing method and water heater provided in the embodiment of this specification form a cylinder weld by melting the cylinder body, so that the material of the cylinder weld is the same as that of the cylinder. During the spinning process, the surface of the cylinder weld and the surface of the cylinder are uniformly deformed, avoiding wrinkling and cracking of the cylinder, thereby improving the quality of the cylinder. There is no need to use high-cost seamless steel pipes for spinning, and the quality of the inner tank formed by spinning can also be guaranteed. Through the spinning process, no welding is required between the cylinder and the first end cover and / or between the cylinder and the second end cover, which reduces the welding process steps, reduces the difficulty of the welding process, and is conducive to reducing the manufacturing cost; at the same time, there is no welding gap between the cylinder and the first end cover and / or between the cylinder and the second end cover, avoiding the erosion of the welding gap by the water stored in the cylinder, ensuring the firmness between the cylinder and the first end cover and / or between the cylinder and the second end cover, which is conducive to extending the service life of the inner tank.

[0058] In order to make the above and other purposes, features and advantages of the embodiments of this specification more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 A schematic diagram of the structure of a water heater inner tank in the prior art is shown;

[0061] Figure 2 A schematic diagram of the structure of an inner tank for a water heater provided in an embodiment of this specification is shown;

[0062] Figure 3 Another structural schematic diagram of an inner tank for a water heater provided in an embodiment of this specification is shown;

[0063] Figure 4 A cross-sectional view of an inner tank for a water heater provided in an embodiment of this specification is shown;

[0064] Figure 5 for Figure 5 The enlarged schematic diagram of point A in the middle;

[0065] Figure 6 It shows a schematic diagram of the structure of the cylindrical material in the embodiment of this specification;

[0066] Figure 7A schematic diagram of the steps of a method for manufacturing an inner tank for a water heater provided in an embodiment of this specification is shown.

[0067] Description of the accompanying symbols:

[0068] 01. Gallbladder;

[0069] 02, 03, end cap;

[0070] 10. Cylinder;

[0071] 11. Cylinder weld;

[0072] 20. a first end cover;

[0073] 21. First end cover weld;

[0074] 22. Open your mouth;

[0075] 30. second end cover;

[0076] 31. Second end cover weld;

[0077] 40. Cylindrical material;

[0078] 41. first connecting edge;

[0079] 42. Second connecting edge. DETAILED DESCRIPTION

[0080] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0081] It should be noted that the terms "first", "second", etc. in this specification and claims and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of this specification described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0082] like Figure 1The figure is a schematic diagram of the structure of the inner tank of a water heater in the prior art, which includes a tank body 01 located in the middle and end covers 02 and 03 located at both ends of the tank body 01. The tank body 01 is obtained by rolling up two opposite sides of a plate and welding them together, and then the tank body 01 is welded to the end covers 02 and 03 on both sides; thus, three welds are usually formed on the inner tank. Since there are many welds on the entire inner tank, and there are connection points between the welds between the tank body and the end covers and the welds of the tank body itself, there are many welding procedures and complex processes, and problems such as poor welding, open welding, and leaking welding are prone to occur. At the welds where the above problems occur, there may be a risk of water leakage and the water heater being electrified, which seriously affects the safety of the electric water heater.

[0083] In order to solve the above problems, the embodiments of this specification provide an inner tank for a water heater, such as Figure 2 As shown, the liner includes:

[0084] A cylinder 10, wherein the cylinder has a cylinder weld 11, and the cylinder weld 11 is formed by melting the material of the main body of the cylinder 10;

[0085] A first end cover 20 and a second end cover 30 , wherein the first end cover 20 and the second end cover 30 are respectively located at two ends of the cylinder 10 , and at least one of the first end cover 20 and the second end cover 30 is formed by spinning of the main body of the cylinder 10 .

[0086] The embodiment of this specification provides an inner tank for a water heater, which forms a cylinder weld by melting the cylinder body, so that the material of the cylinder weld is the same as that of the cylinder. During the spinning process, the surface of the cylinder weld and the surface of the cylinder are uniformly deformed, avoiding wrinkling and cracking of the cylinder, thereby improving the quality of the cylinder. There is no need to use high-cost seamless steel pipes for spinning, and the quality of the inner tank formed by spinning can also be guaranteed. Through the spinning process, no welding is required between the cylinder and the first end cover and / or between the cylinder and the second end cover, which reduces the welding process steps, reduces the difficulty of the welding process, and is conducive to reducing manufacturing costs; at the same time, there is no welding gap between the cylinder and the first end cover and / or between the cylinder and the second end cover, avoiding the erosion of the welding gap by water stored in the cylinder, ensuring the firmness between the cylinder and the first end cover and / or between the cylinder and the second end cover, which is conducive to extending the service life of the inner tank.

[0087] Furthermore, the material of the cylinder weld 11 is the same as the material of the main body of the cylinder 10 .

[0088] In some feasible embodiments, the cylinder weld can be obtained by directly melting the material of the cylinder body. For example, the cylinder weld is obtained by directly hot-melting two butt joint edges of the parent material constituting the cylinder.

[0089] In other feasible embodiments, when the material of the cylinder body is insufficient to melt to form a cylinder weld (for example, the two opposite sides of the parent material used to butt-jointly form the cylinder are not flush), it is possible to further add solder of the same material as the cylinder body on the basis of melting the material of the cylinder body to assist in forming the cylinder weld.

[0090] In some other feasible embodiments, the cylinder welds can all be obtained by melting solder made of the same material as the cylinder body and connecting it to the cylinder body.

[0091] In the embodiments of this specification, preferably, both the first end cover 20 and the second end cover 30 are formed by spinning the main body of the cylinder 10 .

[0092] Since the first end cover and the second end cover are both made of the main body of the cylinder through a spinning process, the welding manufacturing cost of the water heater inner tank can be greatly reduced, while the number of welds on the water heater inner tank can be reduced, and problems such as poor welding, open welding, and leaking welding caused by the welding process can be avoided. The risk of loosening and falling off between the cylinder and the end covers at both ends of the cylinder due to the erosion of running water can be further avoided, which is beneficial to improving the quality and life of the water heater inner tank.

[0093] like Figure 4 and Figure 5 As shown, the surface of the cylinder weld 11 is lower than the surface of the cylinder 10 , or the surface of the cylinder weld 11 is flush with the surface of the cylinder 10 .

[0094] Since the barrel weld is obtained by hot-melting two butt joints of the parent material constituting the barrel, the surface of the barrel weld will be lower than the surface of the barrel. In some preferred embodiments, the surface of the barrel weld obtained by melting can be filled by supplementing the solder of the same material as the barrel body, so that the surface of the barrel weld is flush with the surface of the barrel, which is conducive to the same degree of deformation of the surface of the barrel and the surface of the barrel weld in the subsequent spinning process.

[0095] In the embodiment of the present specification, the absolute value of the height difference between the surface of the cylinder weld and the surface of the cylinder is not greater than a preset value.

[0096] Specifically, the preset value is 2 mm.

[0097] By controlling the height difference between the surface of the cylinder weld and the surface of the cylinder to be less than 2 mm, the uniformity of the thickness at various positions on the cylinder surface is greatly improved. Under the heat conduction of hot water in the cylinder, the cylinder surface is heated more evenly, avoiding deformation and damage of the cylinder due to heat accumulation.

[0098] In some specific embodiments, the cylinder weld is formed after the material of the cylinder body is melted by laser welding or argon arc welding.

[0099] Laser welding is a method of welding that uses a focused laser beam as energy to generate heat from bombarding the weldment. Laser welding technology can improve the accuracy of the weld seam of the inner tank of the water heater provided in the embodiment of this specification and improve the welding quality.

[0100] By utilizing the argon arc welding technology, argon gas can be continuously supplied when the material of the cylinder body is melted, so that the material of the cylinder body does not come into contact with oxygen in the air, thereby avoiding oxidation of the material of the cylinder body.

[0101] In the embodiment of this specification, the cylinder weld extends in a direction from the first end cover to the second end cover.

[0102] In some feasible embodiments, the cylinder weld may not be parallel to the axial direction of the cylinder. For example, the cylinder may be obtained by butt-jointing two opposite sides of a parallelogram-shaped base material.

[0103] In other feasible embodiments, the cylinder weld may be parallel to the axial direction of the cylinder, thereby shortening the length of the cylinder weld, and further reducing the time and cost required to melt the main body material of the cylinder to obtain the cylinder weld.

[0104] like Figure 3 As shown, the first end cover 20 has a first end cover weld 21 , and the second end cover 30 has a second end cover weld 31 .

[0105] When the first end cover 20 and the second end cover 30 are respectively formed by spinning at the two ends of the cylinder with the cylinder weld, in the process of forming the two end covers with the main body material at the two ends of the cylinder, the two ends of the cylinder weld will become the first end cover weld on the first end cover and the second end cover weld on the second end cover respectively during the spinning process.

[0106] In some embodiments, both ends of the cylinder may also have only one end cover, and the end cover on one side has an end cover weld.

[0107] Furthermore, if Figure 3 As shown, the first end cover weld 21 extends along the arc surface of the first end cover 20 to the middle area of ​​the first end cover 20; and / or

[0108] The second end cover weld 31 extends along the arc surface of the second end cover 30 to the middle area of ​​the second end cover 30 .

[0109] Since the first end cap weld is obtained by spinning one end of the cylinder with the cylinder weld, the first end cap weld on the first end cap should extend continuously from the edge where the first end cap is connected to the cylinder along the surface of the first end cap to the middle area of ​​the first end cap. However, under the pressure of the spinning process, the main body material of the first end cap is squeezed and tightened, and at least part of the first end cap weld located thereon is "folded" in the material of the first end cap body. Therefore, visually, the first end cap weld may be "intermittent", and part of the first end cap weld is not directly visible to the naked eye, that is, the first end cap weld can be discontinuously extended along the arc surface of the first end cap to the middle area of ​​the first end cap.

[0110] Similarly, the second end cover weld may be the same as the aforementioned first end cover weld when extending along the arcuate surface of the second end cover to the middle region of the second end cover.

[0111] In the embodiment of this specification, the first end cover weld, the second end cover weld, and the cylinder weld are the same weld.

[0112] Since the first end cover and the second end cover are respectively obtained by spinning at the two ends of the cylinder with the cylinder weld, when the main body material at the two ends of the cylinder forms the end covers at both ends, the cylinder welds at the two ends of the cylinder also form the end cover welds on the end covers at both ends, that is, the first end cover weld, the second end cover weld and the cylinder weld are essentially the same weld.

[0113] like Figure 3 As shown, one end of the cylinder weld 11 extends toward the first end cover 20, forming the first end cover weld 21 on the first end cover 20; and / or

[0114] The other end of the cylinder weld 11 extends toward the second end cover 30 , forming a second end cover weld 31 on the second end cover 30 .

[0115] It should be noted that, under the pressure of the spinning process, the main body material at both ends of the cylinder is squeezed and tightened, so that one end of the cylinder weld extends continuously or discontinuously to the first end cover to form the first end cover weld, and the other end of the cylinder weld extends continuously or discontinuously to the second end cover to form the second end cover weld. The discontinuous extension means that the weld is squeezed and folded in the main body material of at least part of the first end cover and at least part of the second end cover, so that it looks like "discontinuous" from the arc surface of the end cover.

[0116] Since the first end cover and / or the second end cover is a fixed mold in the body material at the left end and / or the right end of the cylinder, and a rotary wheel or a driving rod is used to apply pressure to the outer surface of the body material at the left end and / or the right end of the cylinder, under the action of pressure, at least part of the outer surface of the first end cover weld is smooth, and at least part of the inner surface of the first end cover weld is rough; and / or

[0117] At least a portion of the outer surface of the second end cover weld is smooth, and at least a portion of the inner surface of the second end cover weld is rough.

[0118] And because at least part of the inner surface of the first end cover weld and / or at least part of the inner surface of the second end cover weld is rough, it is convenient to perform sandblasting and enameling operations on the inner surface, which is beneficial to the firmness of the enamel glaze layer combined with the inner surfaces of the cylinder, the first end cover and the second end cover, thereby improving the corrosion resistance of the inner tank and increasing the service life of the inner tank of the water heater.

[0119] At least part of the wall thickness of the first end cover is greater than the wall thickness of the cylinder; and / or

[0120] At least a portion of the wall thickness of the second end cover is greater than the wall thickness of the cylinder.

[0121] Since the first end cover and / or the second end cover are obtained by spinning the two ends of the cylinder with the cylinder weld, under the action of the spinning pressure, the two ends of the cylinder body material are squeezed and contracted, so at least part of the wall thickness of the first end cover and / or at least part of the wall thickness of the second end cover is greater than the wall thickness of the cylinder.

[0122] Specifically, in the embodiments of this specification, the wall thickness of the cylinder is between 1.0 and 3.0 mm; and / or

[0123] The wall thickness of at least part of the first end cap and the wall thickness of at least part of the second end cap are between 1.0 and 20 mm.

[0124] like Figure 2 and Figure 3 As shown, at least one of the first end cover 20 and the second end cover 30 may be spherical or ellipsoidal, or have a circular arc smooth transition structure.

[0125] The first end cover 20 has an opening 22.

[0126] The surface of the first end cover 20 includes a first surface in a curved shape and a second surface extending along the first surface to form an opening 22 .

[0127] In the embodiment of this specification, the first surface and the second surface are integrally formed by spinning the main body material at one end of the cylinder, so that there is no need for welding connection between the first surface and the second surface, and between the first surface and the cylinder, thereby avoiding problems such as poor welding, open welding, and leaking welding caused by welding process, thereby avoiding the risk of water leakage at the weld where the above problems occur and causing water leakage and electrification. The opening can be used to connect devices such as heating rods and electronic anodes.

[0128] In some possible embodiments, the opening is formed by machining.

[0129] In some other feasible embodiments, the opening is an opening formed by spinning the main body of the cylinder.

[0130] The opening is formed by machining or spinning so that there is no weld at the opening, thus avoiding the aforementioned series of problems caused by the welding process.

[0131] The embodiment of this specification provides an inner tank for a water heater, the inner tank comprising:

[0132] A cylinder, wherein the cylinder has a cylinder weld, and the material of the cylinder weld is the same as the material of the main body of the cylinder;

[0133] A first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, and at least one of the first end cover and the second end cover is formed by spinning the main body of the cylinder.

[0134] For example, the cylinder weld can be obtained by directly melting the material of the cylinder body (for example, the cylinder weld is obtained by directly hot-melting the two butt edges of the mother material constituting the cylinder); or, when the material of the cylinder body is not sufficient to melt to form a cylinder weld (for example, the two butt edges of the cylinder mother material have gaps after butt connection, etc.), it is also possible to add solder of the same material as the cylinder body on the basis of melting the material of the cylinder body to assist in forming the cylinder weld; or, the entire weld is obtained by melting the solder of the same material as the cylinder body and connecting it to the cylinder body.

[0135] The inner tank for a water heater provided in the embodiment of this specification has a cylinder weld made of the same material as the cylinder body. During the spinning process, the surface of the cylinder weld and the surface of the cylinder are uniformly deformed, which avoids wrinkling and cracking of the cylinder, thereby improving the quality of the cylinder; and there is no need to use high-cost seamless steel pipes for spinning, which can also ensure the quality of the inner tank formed by spinning. In addition, through the spinning process, at least one of the first end cover and the second end cover does not need to be welded to the cylinder, which reduces the welding process steps, reduces the difficulty of the welding process, and thus reduces the manufacturing cost; at the same time, there is no welding gap between at least one of the first end cover and the second end cover and the cylinder, which avoids the erosion of the welding gap by water stored in the cylinder, ensures the firmness between at least one of the first end cover and the second end cover and the cylinder, and helps to extend the service life of the inner tank.

[0136] In another feasible embodiment, the liner includes:

[0137] A cylinder, wherein the cylinder has a cylinder weld, a surface of the cylinder weld is lower than a surface of the cylinder, or a surface of the cylinder weld is flush with the surface of the cylinder;

[0138] A first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, and at least one of the first end cover and the second end cover is formed by spinning the main body of the cylinder.

[0139] For example, the cylinder weld may be obtained by hot-melting two butt joints of the parent material constituting the cylinder, and therefore, the surface of the cylinder weld may be lower than the surface of the cylinder, or flush with the surface of the cylinder. In some preferred embodiments, in addition to hot-melting the butt joints, solder of the same material as the main body of the cylinder may be added and filled on the obtained cylinder weld surface, so that the surface of the cylinder weld that was originally lower than the surface of the cylinder after hot-melting is flush with the surface of the cylinder.

[0140] In another embodiment, the liner comprises:

[0141] A cylinder, wherein the cylinder has a cylinder weld, and an absolute value of a height difference between a surface of the cylinder weld and a surface of the cylinder is not greater than a preset value, and the preset value is 2 mm;

[0142] A first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, and at least one of the first end cover and the second end cover is formed by spinning the main body of the cylinder.

[0143] For example, the cylinder weld can be obtained by hot-melting two butt edges of the base material constituting the cylinder. Even if the surface of the cylinder weld is not flush with the surface of the cylinder, the height difference between the surface of the cylinder weld and the surface of the cylinder will not be greater than 2 mm, so as to improve the uniformity of the thickness at various positions on the cylinder surface and improve the quality of the liner.

[0144] In another embodiment, the liner comprises:

[0145] A cylinder, wherein the cylinder has a cylinder weld, and the cylinder weld is formed by melting the material of the main body of the cylinder;

[0146] a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, the first end cover has a first end cover weld, and the first end cover weld extends along the arc surface of the first end cover to the middle area of ​​the first end cover; and / or

[0147] The second end cover has a second end cover weld, and the second end cover weld extends along the arc surface of the second end cover to the middle area of ​​the second end cover.

[0148] For example, the first end cap and the second end cap can be obtained by a spinning process at the two ends of the cylinder with a cylinder weld. When the corresponding end cap is formed at at least one of the two ends of the cylinder, the two ends of the cylinder weld on the cylinder will be synchronously formed into the first end cap weld on the first end cap and / or the second end cap weld on the second end cap. In addition, when the main body material at one end of the cylinder forms the first end cap, the main body material at one end of the cylinder is squeezed and tightened, so that at least part of the cylinder weld located thereon is "folded" in the material of the first end cap body. Therefore, visually, the first end cap weld may be "intermittently" extended along the arc surface of the first end cap to the middle area of ​​the first end cap, that is, part of the first end cap weld may not be directly visible to the naked eye.

[0149] When the main body material at the other end of the cylinder forms a second end cover, the second end cover weld may be the same as the first end cover weld when it extends discontinuously along the arc surface of the second end cover to the middle area of ​​the second end cover.

[0150] In another embodiment, the liner comprises:

[0151] A cylinder, wherein the cylinder has a cylinder weld, and the cylinder weld is formed by melting the material of the main body of the cylinder;

[0152] A first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, the first end cover has a first end cover weld, and the second end cover has a second end cover weld; the first end cover weld, the second end cover weld, and the cylinder weld are the same weld.

[0153] For example, the first end cover and the second end cover can be obtained respectively from the two ends of the cylinder with the cylinder weld by a spinning process. While the main body material at the two ends of the cylinder forms the end covers at both ends, the cylinder welds at both ends of the cylinder also correspondingly form the end cover welds on the end covers at both ends. Therefore, the first end cover weld, the second end cover weld and the cylinder weld are essentially the same weld.

[0154] The present specification also provides a method for manufacturing an inner tank of a water heater, such as Figure 7 As shown, it is a schematic diagram of the steps of a method for manufacturing an inner tank for a water heater provided in an embodiment of this specification. This specification provides method operation steps as described in the embodiment or flow chart, but more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiment is only one way of executing the steps among many orders, and does not represent the only order of execution. When the system or device product is executed in practice, it can be executed in the order of the method shown in the embodiment or the drawings or in parallel. The method includes,

[0155] S710: Roll the liner material into a cylindrical material.

[0156] For example, the material of the inner container rolled into a cylindrical material can be as follows Figure 6 shown.

[0157] S720: Melting the main body of the cylindrical material to form a cylindrical body with a cylindrical body weld.

[0158] For example, two sides of the inner liner material rolled into a cylindrical material are melted and connected to form a cylindrical body weld, and the cylindrical material forms the cylindrical body.

[0159] S730: Spin at least one end of the cylinder to form an end cap of the cylinder.

[0160] A mold is fixed inside at least one end of the cylinder, and a spinning wheel or a driving rod is used to apply pressure to the outer surface of the main body material of at least one end of the cylinder, so that the main body material of the cylinder shrinks and tightens under the spinning pressure to form the end cover.

[0161] The embodiment of this specification provides a method for manufacturing an inner tank for a water heater, which forms a cylinder weld by melting the main body material of the cylinder, so that the material of the cylinder weld is the same as that of the cylinder; and then during the spinning process, the surface of the cylinder weld and the surface of the cylinder are uniformly deformed, avoiding wrinkling and cracking of the cylinder, thereby improving the quality of the cylinder, and no high-cost seamless steel pipe is required for spinning, and the quality of the inner tank formed by spinning can be guaranteed. At least one end cap is manufactured by the spinning process, so that there is no need for welding between the cylinder and the at least one end cap, reducing the welding process steps, reducing the difficulty of the welding process, and helping to reduce the manufacturing cost; at the same time, there is no welding gap between the cylinder and the at least one end cap, avoiding the erosion of the welding gap by water stored in the cylinder, ensuring the firmness between the cylinder and the at least one end cap, and helping to extend the service life of the inner tank.

[0162] After the step S720 of melting the body of the cylindrical material to form a cylinder having a cylinder weld, the method further includes:

[0163] The cylinder is cut into sections.

[0164] In the embodiments of the present specification, the liner material can be first rolled into a cylindrical material with a relatively long length, and then two sides of the cylindrical material parallel to the axial direction are melted and butted to form a cylindrical body, and then the cylindrical body is cut into required segments according to the size of the liner. Therefore, compared with the method of first cutting the cylindrical material into segments and then butting and melting, only two sides of the cylindrical material need to be butted once, which is conducive to improving the efficiency of cylindrical body manufacturing.

[0165] Of course, in some feasible embodiments, before step S710 of rolling the liner material into a cylindrical material, the method further includes:

[0166] The inner liner material is cut into sections or a plate is used as the inner liner material.

[0167] The cut sections are rolled, butted and melted in turn to obtain cylinders.

[0168] In the embodiment of this specification, the step S720 of melting the main body of the cylindrical material to form a cylindrical body with a cylindrical body weld is specifically as follows:

[0169] The main body of the cylindrical material is melted to form a cylindrical weld along the axial direction of the cylindrical material.

[0170] Specifically, the cylinder weld can be obtained by directly melting the material of the cylinder body (for example, the cylinder weld is obtained by directly hot-melting two butted edges of the parent material constituting the cylinder). Alternatively, when the material of the cylinder body is not sufficient to melt to form a cylinder weld (for example, there are gaps on the two edges of the cylindrical material after butting), solder of the same material as the cylinder body can be further added on the basis of melting the material of the cylinder body to assist in forming the cylinder weld.

[0171] In the embodiment of this specification, the step S730 of spinning at least one end of the cylinder to form the end cap of the cylinder is specifically:

[0172] Both ends of the cylinder are spun to form a first end cap and a second end cap respectively.

[0173] In the embodiments of the present specification, the two ends of the cylinder body are spun to form a first end cover and a second end cover, thereby reducing the welding cost of the water heater inner tank; at the same time, reducing the number of welds on the water heater inner tank; and avoiding problems such as poor welding, open welding, and leaking welding, as well as the risk of the cylinder and its two end covers loosening or falling off at the welds under the erosion of running water, which is beneficial to improving the quality and life of the water heater inner tank.

[0174] The steps of forming the first end cap and the second end cap are specifically:

[0175] The two ends of the cylinder and the cylinder welds located at the two ends of the cylinder are spun to form a first end cover with a first end cover weld and a second end cover with a second end cover weld.

[0176] That is, in the process of spinning the main body material at both ends of the cylinder to form the end covers at both ends, the two ends of the cylinder weld will become the first end cover weld on the first end cover and the second end cover weld on the second end cover during the spinning process.

[0177] Furthermore, when spinning is performed on both ends of the cylinder, the wall thickness of at least part of the first end cover is made greater than the wall thickness of the cylinder; and / or

[0178] The wall thickness of at least a portion of the second end cover is greater than the wall thickness of the cylinder.

[0179] Since the first end cover and / or the second end cover are obtained by spinning the two ends of the cylinder with the cylinder weld, under the action of the spinning pressure, the two ends of the cylinder body material are squeezed and tightened, so at least part of the wall thickness of the first end cover and / or at least part of the wall thickness of the second end cover is greater than the wall thickness of the cylinder.

[0180] After step S730 of spinning at least one end of the cylinder to form an end cap of the cylinder, the method further includes:

[0181] The middle region of the end cap is machined to have an opening.

[0182] The opening can be used to connect devices such as heating rods and electronic anodes. The middle part of the end cap is provided with an opening by machining, so that the end cap does not need to be welded at the opening, thereby avoiding problems such as loosening and falling off of the opening caused by poor welding, weld seam opening, and leakage welding.

[0183] In another feasible embodiment, step S730 of spinning at least one end of the cylinder to form an end cap of the cylinder is specifically:

[0184] One end of the cylinder is spun to form a first end cover of the cylinder with an opening, and the other end of the cylinder is spun to form a second end cover of the cylinder.

[0185] Similar to forming an opening at the end cover by machining, forming an opening at the end cover by spinning also eliminates the need for welding between the end cover and the opening, thereby reducing the high cost of the welding process and avoiding safety hazards such as loosening and falling of the opening caused by poor welding, open welding, and leaking welding.

[0186] Further, in the embodiment of this specification, the step S720 of melting the main body of the cylindrical material to form a cylindrical body with a cylindrical body weld is specifically,

[0187] The first connecting edge and the second connecting edge of the inner liner material constituting the cylindrical material are butt-melted to form a cylindrical weld along the axial direction of the cylindrical material, so that the cylindrical material forms a cylindrical body with a closed annular cross-section.

[0188] That is Figure 6 As shown, the cylindrical material 40 has a first connecting edge 41 and a second connecting edge 42. The first connecting edge 41 and the second connecting edge 42 are two opposite edges of the inner liner material used to be rolled into the cylindrical material 40. The first connecting edge 41 and the second connecting edge 42 are melted and connected to form the cylindrical body weld, thereby realizing the process of making the inner liner material into the cylindrical body.

[0189] The embodiment of this specification also provides a water heater, which includes an inner tank provided by the above technical solution.

[0190] And the embodiment of this specification also provides a water heater, which includes an inner tank manufactured based on the manufacturing method of the inner tank for the water heater provided by the above technical solution.

[0191] The beneficial effects achieved by the water heater provided in the embodiments of this specification are consistent with the beneficial effects achieved by the inner tank for the water heater provided above, and will not be repeated here.

[0192] In the present specification embodiment, the combination of the elements, ingredients, parts or steps described here using the terms "comprise" or "include" also contemplates the implementation method that is basically composed of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The public "one" or "one" used to describe an element, ingredient, part or step does not say that it is for excluding other elements, ingredients, parts or steps.

[0193] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. The above-mentioned embodiment is only for illustrating the technical concept and features of this embodiment. Its purpose is to enable people familiar with this technology to understand the content of the embodiment of this specification and implement it accordingly, and it cannot be used to limit the protection scope of the embodiment of this specification. Any equivalent changes or modifications made according to the spirit of the embodiment of this specification should be covered within the protection scope of the embodiment of this specification.

Claims

1. An inner tank for a water heater, characterized in that: The liner comprises: A cylinder, wherein the cylinder has a cylinder weld, and the cylinder weld is formed by melting the material of the main body of the cylinder; A first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the cylinder, and at least one of the first end cover and the second end cover is formed by spinning the main body of the cylinder.

2. The liner according to claim 1, characterized in that: The material of the cylinder weld is the same as that of the cylinder body.

3. The inner container according to claim 1, characterized in that: The first end cover and the second end cover are both formed by spinning the main body of the cylinder.

4. The inner container according to claim 1, characterized in that: The surface of the cylinder weld is lower than the surface of the cylinder, or the surface of the cylinder weld is flush with the surface of the cylinder.

5. The inner container according to claim 1, characterized in that: An absolute value of a height difference between a surface of the cylinder weld and a surface of the cylinder is not greater than a preset value.

6. The inner container according to claim 5, characterized in that: The preset value is 2 mm.

7. The liner according to claim 1, characterized in that: The cylinder weld is formed after the material of the cylinder body is melted by laser welding or argon arc welding.

8. The inner container according to claim 1, characterized in that: The cylinder weld extends in a direction from the first end cover to the second end cover.

9. The inner container according to claim 1, characterized in that: The first end cover has a first end cover weld; and / or The second end cap has a second end cap weld.

10. The inner container according to claim 9, characterized in that: The first end cover weld extends along the arcuate surface of the first end cover to the middle area of ​​the first end cover; and / or The second end cover weld extends along the arcuate surface of the second end cover to a middle region of the second end cover.

11. The inner container according to claim 9, characterized in that: The first end cover weld, the second end cover weld, and the cylinder weld are the same weld.

12. The inner container according to claim 9, characterized in that: One end of the cylinder weld extends toward the first end cover to form the first end cover weld on the first end cover; and / or The other end of the cylinder weld extends toward the second end cover, forming the second end cover weld on the second end cover.

13. The liner according to claim 9, characterized in that: At least a portion of the outer surface of the first end cover weld is smooth, and at least a portion of the inner surface of the first end cover weld is rough; and / or At least a portion of the outer surface of the second end cover weld is smooth, and at least a portion of the inner surface of the second end cover weld is rough.

14. The liner according to claim 1, characterized in that: At least part of the wall thickness of the first end cover is greater than the wall thickness of the cylinder; and / or At least a portion of the wall thickness of the second end cover is greater than the wall thickness of the cylinder.

15. The liner according to claim 1, characterized in that: The wall thickness of the cylinder is between 1.0 mm and 3.0 mm; and / or The wall thickness of at least part of the first end cap and the wall thickness of at least part of the second end cap are between 1.0 and 20 mm.

16. The liner according to claim 1, characterized in that: The first end cover has an opening, The surface of the first end cover comprises a first surface which is an arc surface, and a second surface which extends along the first surface to form an opening.

17. The liner according to claim 16, characterized in that: The opening is an opening formed by machining.

18. The liner according to claim 16, characterized in that: The opening is an opening formed after the main body of the cylinder is spun.

19. The liner according to claim 1, characterized in that: At least one of the first end cap and the second end cap is spherical or ellipsoidal.

20. A method for manufacturing an inner tank of a water heater, characterized in that: The method comprises, Roll the liner material into a cylindrical material; Melting the main body of the cylindrical material to form a cylindrical body with a cylindrical body weld; At least one end of the cylinder is spun to form an end cap of the cylinder.

21. The method according to claim 20, characterized in that After the step of melting the body of the cylindrical material to form a cylinder having a cylinder weld, the method further comprises: The cylinder is cut into sections.

22. The method according to claim 20, characterized in that Before the step of rolling the liner material into a cylindrical material, the method further comprises: The inner liner material is cut into sections or a plate is used as the inner liner material.

23. The method according to claim 20, characterized in that The step of melting the cylindrical material body to form a cylindrical body with a cylindrical body weld is specifically, The main body of the cylindrical material is melted to form a cylindrical weld along the axial direction of the cylindrical material.

24. The method according to claim 20, characterized in that The step of spinning at least one end of the cylinder to form an end cap of the cylinder is specifically, Both ends of the cylinder are spun to form a first end cap and a second end cap respectively.

25. The method according to claim 24, characterized in that The step of forming the first end cover and the second end cover is specifically to spin the two ends of the cylinder and the cylinder welds located at the two ends of the cylinder to form a first end cover with a first end cover weld and a second end cover with a second end cover weld.

26. The method according to claim 24, characterized in that When spinning is performed on both ends of the cylinder, the wall thickness of at least part of the first end cover is made greater than the wall thickness of the cylinder; and / or The wall thickness of at least a portion of the second end cover is greater than the wall thickness of the cylinder.

27. The method according to claim 20, characterized in that After the step of spinning at least one end of the cylinder to form an end cap of the cylinder, the method further comprises: The middle region of the end cap is machined to have an opening.

28. The method according to claim 20, characterized in that The step of spinning at least one end of the cylinder to form an end cap of the cylinder is specifically, spinning one end of the cylinder to form a first end cap of the cylinder with an opening, and spinning the other end of the cylinder to form a second end cap of the cylinder.

29. A water heater, characterized in that: The water heater comprises an inner tank as described in any one of claims 1 to 19.

30. A water heater, characterized in that: The water heater comprises an inner tank manufactured according to any one of the methods of claims 20 to 28.

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