CN115890176A - Inner container of electric water heater and preparation method and application thereof - Google Patents

Abstract

The invention discloses an inner container of an electric water heater as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing at least one first special pipe and at least one second special pipe, wherein openings arranged along the length direction of the first special pipe are arranged on the pipe wall of the first special pipe, a plane is arranged on the pipe wall of the second special pipe, and the orthographic projection of the openings on the plane is positioned in the plane; welding the opening of the first special pipe and the plane of the second special pipe to obtain a multi-pipe welding assembly formed by connecting two adjacent pipe fittings through a plane pulling plate; cutting the multi-pipe welding assembly to obtain at least one multi-liner barrel body with the expected length; and welding end covers at two ends of the multi-liner barrel body to obtain a multi-liner product with through end parts. The method has the advantages of high production efficiency, realization of the manufacture of the liner barrel body with compact and high precision, strong applicability and compatibility to materials, higher utilization rate of energy, and realization of efficient and unmanned production and low-cost manufacture of the special-shaped multi-liner.

Description

Inner container of electric water heater and preparation method and application thereof

Technical Field

The invention belongs to the field of water heaters, and particularly relates to an inner container of an electric water heater as well as a preparation method and application thereof.

Background

The inner container of the existing electric water heater is mainly of a barrel-shaped structure, and the barrel body is huge to ensure the water containing capacity of the water heater and needs a large space for installation. The existing double-liner product can form a flat appearance, but the inner liner of the double-liner product is formed by penetrating the middle of 2 inner liner cylinders, and because two barrel bodies of the double-liner product are penetrated by a middle pipeline, the structure is not compact enough, huge space waste is caused, and the space utilization rate of the structure is lower. Meanwhile, the existing double-liner manufacturing process is extremely complex, 17 welding lines are totally used, the manufacturing cost is high, the efficiency is low, and the production efficiency of the product in unit time is only about 30% of that of the existing single-liner product. Therefore, the structure and the manufacturing method of the electric water heater with multiple inner containers still need to be further improved.

Disclosure of Invention

The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the invention aims to provide an inner container of an electric water heater, a preparation method and application thereof, the method for preparing the electric water heater has high production efficiency, can realize the manufacture of the inner container barrel body of the electric water heater with compact type and high precision, has strong applicability to materials, can be compatible with the manufacture of inner containers with different material grades and the existing metal material component system, has higher utilization rate of energy, and can realize the efficient and unmanned production and low-cost manufacture of special-shaped multi-inner containers.

In one aspect of the invention, a method of making an electric water heater liner is provided. According to an embodiment of the invention, the method comprises:

(1) Preparing at least one first special pipe and at least one second special pipe, wherein the pipe wall of the first special pipe is provided with an opening arranged along the length direction of the first special pipe, the pipe wall of the second special pipe is provided with a plane, and the orthographic projection of the opening on the plane is positioned inside the plane;

(2) Welding the opening of the first special pipe and the plane of the second special pipe so as to obtain a multi-pipe welding assembly with two adjacent pipe fittings connected through a plane pulling plate;

(3) Cutting the multi-tube welding assembly to obtain at least one multi-liner barrel body with a desired length;

(4) And welding end covers at two ends of the multi-liner barrel body so as to obtain a multi-liner product with a through end part.

The method for preparing the inner container of the electric water heater in the embodiment of the invention at least has the following advantages: 1. the manufacturing of the compact inner container barrel body can be realized, and the space waste of the appearance structure is reduced; 2. the production efficiency is high, the maximum speed per minute can realize the manufacture of the special-shaped steel pipe with the length of 40m, the length of each barrel body is calculated by 0.5m, the manufacture of 40 barrel bodies per minute can be realized, and the manufacture process is more than 30 times that of the existing barrel body manufacturing process; 3. the processes of blanking, cleaning, forming, welding and cutting can be carried out on one production line, so that one stream of barrel body manufacturing is realized; 4. automatic production can be realized, and manual operation and processing are not needed; 5. the energy utilization rate is higher; 6. the manufacturing of the high-precision barrel body can be realized, the size deviation is only 0.5mm, and is only one tenth of the size tolerance manufactured by the prior art, and the butt welding of the end cover and the barrel body can be effectively ensured by the high-precision barrel body manufacturing method; 7. the welding process is constructed outside the barrel body, the inner surface does not need to be manually polished, and the quality of enamel is favorably improved; 8. the pipe wall plane of the special pipe is used as a plane pulling plate of the multi-liner barrel body to be welded with the special pipe provided with the opening arranged along the length direction, so that the welding procedures and the number of welding seams can be greatly reduced, and the aims of reducing the production cost and improving the production efficiency and the product percent of pass are fulfilled; 9. the manufacturing method has strong material adaptability, can be compatible with the manufacturing of the inner containers with different material grades, and can be compatible with the existing metal material component system.

In addition, the method for preparing the inner container of the electric water heater according to the above embodiment of the invention may also have the following additional technical features:

in some embodiments of the invention, in step (1), the first profile pipe is a C-shaped pipe, and the second profile pipe comprises a D-shaped pipe and/or a flat elliptical pipe, and the C-shaped pipe comprises a C-shaped arc pipe and/or a C-shaped flat elliptical pipe.

In some embodiments of the invention, step (1) satisfies at least one of the following conditions: the C-shaped pipe, the D-shaped pipe and the flat elliptical pipe are respectively and independently formed directly by rolling or rolling; preparing a circular tube in advance, and cutting the circular tube to obtain the C-shaped tube; preparing a circular tube in advance, and then carrying out extrusion forming on the circular tube to obtain the D-shaped tube or the flat elliptical tube; and cutting the plane of the D-shaped pipe to obtain the C-shaped pipe, and cutting one plane of the flat elliptic pipe to obtain the C-shaped flat elliptic pipe.

In some embodiments of the invention, the circular tube, the D-shaped tube and the flat elliptical tube are each independently straight slit steel tubes, and the weld of the D-shaped tube and the flat elliptical tube are each independently located in a non-planar area.

In some embodiments of the invention, in step (2), the multi-tube welding assembly comprises: 1 of said C-tubes and 1 of said D-tubes; alternatively, 2 said C-shaped tubes and 1 said flat elliptical tube; or 1 said C-arc tube, at least 1 said C-flat oval tube, and 1 said D-shaped tube; or 2C-shaped arc tubes, 1 flat elliptical tube and at least 1C-shaped flat elliptical tube.

In some embodiments of the invention, the C-arc tube and the D-tube are symmetrical with respect to a planar configuration of the D-tube.

In some embodiments of the invention, the planar chord center distance of the D-shaped pipe is 30-150 degrees; and/or the opening radian of the C-shaped pipe is 30-150 degrees.

In some embodiments of the invention, in step (1), an orthographic area of the opening on the plane is equal to an area of the plane.

In some embodiments of the present invention, before performing step (2), further comprising: at least one hole is cut in the plane.

In some embodiments of the invention, in the step (2), the length of the multi-liner barrel body is 200-1000 mm.

In some embodiments of the present invention, the end cap includes a plurality of concave surfaces connected in sequence, and the plurality of concave surfaces correspond to end structures of respective special pipes in the multi-liner barrel body in a one-to-one manner.

In some embodiments of the invention, the edge of the end cap coincides with the end edge of the multi-tube welding assembly.

In some embodiments of the present invention, the method of making an electric water heater liner further comprises: (5) And welding a water pipe on the multi-liner product so as to obtain the liner of the electric water heater.

In some embodiments of the invention, the water pipe is welded to the multi-liner barrel body and/or the end cap.

In yet another aspect, the present invention provides an inner container of an electric water heater. According to an embodiment of the invention, the inner container of the electric water heater comprises:

the multi-liner barrel body comprises at least two special pipes with equal length, one pipe wall of every two adjacent special pipes is provided with an opening penetrating through the length direction of the special pipes, the other pipe wall of every two adjacent special pipes is provided with a plane, the orthographic projection of the opening on the plane is positioned in the plane, and the two adjacent special pipes are connected with the plane through the openings in a welding mode;

the two end covers are respectively and independently arranged at two ends of the multi-inner-container barrel body, concave surfaces matched with the end structures of the multi-inner-container barrel body are formed on the end covers, the edges of the end covers are welded with the ends of the multi-inner-container barrel body in a sealing mode, and an interval space is formed between at least one part of each special-shaped pipe end and each concave surface.

Compared with the prior art, the preparation of the electric water heater liner of the embodiment of the invention at least has the following advantages: 1. the multi-inner-container barrel body has a compact structure and high space utilization rate; 2. the inner container barrel body has high precision, the size deviation is only 0.5mm, the size deviation is only one tenth of the size tolerance manufactured by the prior art, and the butt welding effect of the end cover and the barrel body is good; 3. the enamel quality of the inner surface of the inner container barrel body is high; 4. the number of welding seams is small, the product quality is high, and the production cost is low; 5. the method can be suitable for different material grades and the existing metal material component systems; 6. the structure stability is good, the risk of water pressure pulse deformation is small, and the service life is longer.

In some embodiments of the present invention, the special pipe having the opening penetrating the length direction thereof on the pipe wall is a C-shaped pipe, and the special pipe having the flat surface on the pipe wall includes a D-shaped pipe and/or a flat elliptical pipe, and the C-shaped pipe includes a C-shaped arc pipe and/or a C-shaped flat elliptical pipe.

In some embodiments of the invention, at least one opening is provided on a plane connecting two adjacent profiled tubes.

In some embodiments of the present invention, the electric water heater liner further comprises: the water pipe is arranged on the multi-liner barrel body and/or the end cover.

In some embodiments of the invention, the inner container of the electric water heater is prepared by the method for preparing the inner container of the electric water heater.

In yet another aspect of the present invention, an electric water heater is provided. According to the embodiment of the invention, the inner container of the electric water heater is provided with the inner container of the electric water heater or the inner container of the electric water heater prepared by the method for preparing the inner container of the electric water heater. Compared with the prior art, the electric water heater has the advantages of compact appearance structure, high space utilization rate, high product precision, good quality, better structural stability and longer service life.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a flow chart of a method of making an inner bladder of an electric water heater according to one embodiment of the present invention.

Fig. 2 is a schematic structural view of the opening/plane of the special pipe according to an embodiment of the present invention (in fig. 2, (a) is a C-shaped pipe, (b) is a C-shaped flat oval pipe, (C) is a D-shaped pipe, and (D) is a flat oval pipe).

Fig. 3 is a schematic view of a combination mode of a dual-liner structure special pipe of an electric water heater according to an embodiment of the invention.

Fig. 4 is a schematic view of a combination manner of a three-liner structure special pipe of an electric water heater according to an embodiment of the invention.

Fig. 5 is a schematic view of a combination manner of a three-liner structure special pipe of an electric water heater according to another embodiment of the invention.

Fig. 6 is a schematic view of a combination manner of a four-liner structural special pipe of an electric water heater according to an embodiment of the invention.

Fig. 7 is a schematic view of a combination manner of four inner containers of an electric water heater with a special pipe according to another embodiment of the invention.

FIG. 8 is an angular schematic of the chord center distance of the plane of the D-shaped tube according to one embodiment of the present invention.

Figure 9 is a schematic illustration of the severing of a multi-tube welded assembly and the construction of the severed multi-bladder keg body, according to one embodiment of the present invention.

Fig. 10 is a schematic structural diagram of an inner container of an electric water heater according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The present invention is mainly based on the following problems and findings:

the existing water heater and the preparation process thereof mainly have the following defects: 1. the barrel body is formed and processed by adopting a rolling process, the roundness of the barrel body is difficult to ensure, the pulse deformation caused by water pressure in the use process of the electric water heater cannot be effectively controlled, and the fatigue life of the pulse is difficult to control; 2. the appearance is not compact enough, wherein the space of more than 16mm is wasted in the middle of the double-liner product; 3. the manufacturing process is complex, the number of welding procedures is more, wherein the number of welding seams of the double-container product reaches 17, the manufacturing cost is high, the product percent of pass is low, and a large number of workpieces need to be reworked; 4. the efficiency is low, and the production efficiency of the product in unit time is only about 30 percent of that of the existing single-liner product; 5. the manufacturing process needs more manual operations, and automatic barrel body production is difficult to realize.

In view of the above, in one aspect of the invention, a method of making an electric water heater liner is provided. The method for manufacturing the liner of the electric water heater is described in detail below with reference to fig. 1 to 10, and according to an embodiment of the invention, the method comprises the following steps:

s100: at least one first profile tube and at least one second profile tube are prepared, the tube wall of the first profile tube is provided with openings arranged along the length direction thereof (see (a) and (b) in fig. 2, wherein 12 is an opening), the tube wall of the second profile tube is provided with a plane (see (c) and (d) in fig. 2, wherein 13 is a plane), and the orthographic projection of the opening on the plane is positioned inside the plane. According to the embodiment of the invention, the orthographic projection of the opening of the tube wall of the first special-shaped tube on the plane of the tube wall of the second special-shaped tube is positioned in the plane, so that the reliability and the hydraulic pulse deformation resistance of the plane pulling plate during the subsequent welding of the first special-shaped tube and the second special-shaped tube can be further ensured.

According to some specific embodiments of the present invention, as will be understood by referring to fig. 2 (a) and (b), the openings arranged along the length direction of the first profile pipe preferably penetrate through the pipe wall of the whole profile pipe, further, the first profile pipe may be a C-shaped pipe, and the second profile pipe may be selected from a D-shaped pipe and/or a flat oval pipe. The C-shaped tube may be selected from a C-shaped arc tube (preferably, a C-shaped circular tube, that is, a cross section of the C-shaped tube perpendicular to the length direction thereof is an arc, as understood with reference to fig. 3) and a C-shaped flat elliptical tube, and the C-shaped tube may be directly formed by rolling or rolling, or a circular tube or a flat elliptical tube may be prepared in advance, and then the circular tube or the flat elliptical tube (formed) is cut to obtain the C-shaped tube, or a C-shaped tube may be obtained by cutting a plane of the D-shaped tube, or a C-shaped (flat elliptical) tube may be obtained by cutting one of the planes of the flat elliptical tube, and then the C-shaped tube is cut after the circular tube is prepared, or a set of rolling mill for preparing the C-shaped tube may be omitted by directly rolling or roll forming. The D-shaped pipe is a special-shaped pipe fitting formed by enclosing a straight line and an arc (preferably circular arc, namely the D-shaped pipe can be preferably a D-shaped round pipe as understood by referring to fig. 3) on a cross section perpendicular to the length direction of the D-shaped pipe, the D-shaped pipe can be formed by welding a C-shaped pipe and a flat plate, the D-shaped pipe can be obtained by preparing the round pipe and then pressing or extruding the round pipe, and the D-shaped pipe is preferably obtained by pressing or extruding the round pipe. The flat elliptic pipe is a special-shaped pipe fitting (understood by referring to fig. 2 and 4) which is similar to an elliptic shape and is formed by two parallel lines and two sections of arcs respectively connected with two ends of the two parallel lines in a surrounding way on a cross section perpendicular to the length direction of the flat elliptic pipe, wherein the two sections of arcs respectively connected with two ends of the two parallel lines can be preferably arcs; the C-shaped flat elliptical tube can be understood as a special-shaped tube with one plane cut off from the flat elliptical tube, preferably, two ends of the cross section of the C-shaped flat elliptical tube perpendicular to the length direction of the C-shaped flat elliptical tube are also circular arcs, the flat ellipse can be obtained by pressing or extruding a circular tube, and the C-shaped flat elliptical tube can be directly rolled or can be obtained by cutting one plane of the flat elliptical tube. The inventor finds that the multi-liner barrel body is prepared by adopting the C-shaped circular tube and/or the C-shaped flat elliptical tube with the two ends of the section vertical to the length direction being circular arcs as the first special-shaped tube and adopting the D-shaped circular tube and/or the flat elliptical tube with the two ends of the section vertical to the length direction being circular arcs as the second special-shaped tube, so that the roundness of the barrel body is more favorably ensured, the pulse deformation caused by the water pressure of the electric water heater in the using process is further favorably controlled, and the problem that the service life of the electric water heater is difficult to control due to pulse fatigue can be effectively solved or relieved.

According to some further specific embodiments of the present invention, in the process of preparing the special pipe, the steel plate needs to be cleaned to remove oil stains on the surface thereof, wherein the cleaning may be performed before the pipe is manufactured, specifically, the cleaning may be performed before the forming, and then the welding may be performed, or the forming, the welding may be performed before the cleaning is performed. Furthermore, the circular tube, the D-shaped tube and the elliptical tube can be straight seam steel tubes respectively and independently, a welding seam does not exist on the C-shaped tube preferably, and the welding seams of the D-shaped tube and the elliptical tube can be respectively and independently positioned in a non-planar area; meanwhile, an inner scraper and an outer scraper are required to be used for scraping after the first special pipe and the second special pipe are welded subsequently, compared with other parts, the size deformation or fluctuation of the joint of the first special pipe and the second special pipe is relatively larger, and the difficulty in further welding at the part where a welding seam exists is relatively larger. In addition, in the process of manufacturing the special pipe, a high-frequency welded pipe process can be adopted for manufacturing the straight-seam steel pipe, in the process of forming the raw materials, efficient cleaning agents can be sequentially used for cleaning to remove oil stains, water is used as cooling liquid, the surface of the steel plate is cleaned, and in the process of high-frequency welding, moisture drying can be carried out through welding heat.

According to still other embodiments of the present invention, an orthographic projection area of the opening arranged in the length direction on the tube wall of the first special-shaped tube on the tube wall plane of the second special-shaped tube may be equal to an area of the tube wall plane of the second special-shaped tube, and preferably, an orthographic projection edge of the opening arranged in the length direction on the tube wall of the first special-shaped tube on the tube wall plane of the second special-shaped tube coincides with a tube wall plane edge of the second special-shaped tube, for example, on a cross section of the special-shaped tube perpendicular to the length direction, a circumferential opening (straight line) distance of the C-shaped tube, a straight edge distance of the D-shaped tube, and a straight edge distance of the flat elliptic tube may be the same, so that reliability and hydraulic pulse deformation resistance of the flat pulling plate when the first special-shaped tube and the second special-shaped tube are welded subsequently can be further ensured, and space waste between the barrels of the plurality of liners can be further reduced.

S200: and welding the opening of the first special pipe and the plane of the second special pipe so as to obtain a multi-pipe welding assembly with two adjacent pipe fittings connected through a plane pulling plate. For example, at least one C-shaped tube may be welded with at least one D-shaped tube and/or flat oval tube to obtain a multi-tube welded assembly, wherein the welding process is performed outside the barrel, and the inner surface does not need to be ground manually, which is more beneficial to improve the enamel quality. According to the embodiment of the invention, when the multi-liner barrel body is prepared, the welding of 3 components is not allowed to be realized simultaneously in principle, the welding difficulty is high, the welding effect is difficult to guarantee, compared with the situation that two special pipes are welded on a plane pulling plate in advance, the opening of one special pipe is welded with the plane of the other special pipe, on one hand, the welding difficulty can be reduced, the welding effect can be guaranteed, the operability is good, the reliability is higher, on the other hand, the welding process and the number of welding seams at the joint of the multi-liner barrel body can be greatly reduced, the size of the welding seams is reduced, the production cost can be reduced, the production efficiency can be improved, and the precision of the barrel body can be improved.

According to some embodiments of the invention, the multiple tube welding assembly may include various combinations, such as:

according to a specific example of the present invention, when the electric water heater includes two connected inner container barrels, as shown in fig. 3, the multi-tube welding assembly may be obtained by welding 1C-shaped tube and 1D-shaped tube, wherein the C-shaped tube and the D-shaped tube may be symmetrical with respect to a plane structure of the D-shaped tube, and in this case, the C-shaped tube may preferably be a C-shaped round tube, and the D-shaped tube may preferably be a D-shaped round tube; or, the C-shaped pipe can be a C-shaped flat elliptical pipe, the D-shaped pipe can be a flat elliptical pipe, and both ends of the section of the C-shaped flat elliptical pipe and the section of the flat elliptical pipe perpendicular to the length direction can be circular arcs, so that the roundness of the barrel body can be further ensured, the pulse deformation risk caused by water pressure of the electric water heater in the using process can be reduced, and the problem that the service life of the electric water heater is difficult to control due to pulse fatigue can be effectively solved or relieved.

According to a specific example of the present invention, when the electric water heater includes three connected inner container barrels, as understood with reference to fig. 4, the multi-tube welding assembly may preferably be formed by welding 2C-shaped tubes and 1 flat elliptical tube, in which case two C-shaped tubes may be symmetrically welded on two planes of the flat elliptical tube; as can be understood by referring to fig. 5, the multi-tube welding assembly may also be formed by welding 1D-shaped tube, 1C-shaped flat elliptical tube and a C-shaped arc tube, at this time, the plane of the D-shaped tube may be welded with the opening of the C-shaped flat elliptical tube, the opening of the C-shaped tube may be welded with the plane of the C-shaped flat elliptical tube, at this time, the arc structures of the C-shaped tube and the D-shaped tube may be the same, preferably, the C-shaped (arc) tube may be a C-shaped circular tube, the D-shaped tube may preferably be a D-shaped circular tube, and both ends of the section perpendicular to the length direction of the C-shaped (arc) flat elliptical tube may be circular arcs, more preferably, the C-shaped circular tube and the D-shaped circular tube may be symmetrical with respect to the plane structure of the D-shaped tube (only for the C-shaped circular tube and the D-shaped circular tube, rather than for the welded multi-liner structure), thereby further ensuring the roundness of the multi-liner barrel body and reducing the risk of the pulse deformation caused by the water pressure during the use of the electric water heater.

According to a specific example of the present invention, when the electric water heater includes 4 or more than 4 connected inner container barrels, as shown in fig. 6, the multi-tube welding assembly can be formed by welding 1D-shaped tube, at least 2C-shaped flat oval tubes and 1C-shaped arc tube, where the plane of the D-shaped tube can be welded with the opening of the C-shaped flat oval tube, and the plane of the C-shaped flat oval tube can be welded with the opening of another C-shaped flat oval tube or the opening of the C-shaped arc tube; or, as shown in fig. 7, the multi-tube welding assembly may also be formed by welding 1 flat elliptical tube, at least 1C-shaped flat elliptical tube and 2C-shaped arc tubes, at this time, one of the planes of the flat elliptical tubes may be welded to the opening of one C-shaped arc tube, the other plane may be welded to the openings of 1C-shaped flat elliptical tube, and the opening of the remaining C-shaped arc tube is welded to the plane of one of the C-shaped flat elliptical tubes, that is, when the electric water heater includes more than 4 inner containers, the electric water heater may be implemented by increasing the number of the C-shaped flat elliptical tubes. Wherein, preferably, make 2C arc tubes located at both ends of the multi-tube welding assembly symmetrical, or make C arc tubes located at both ends of the multi-tube welding assembly symmetrical with cambered surface of the D-shaped pipe. In any combination, it is preferable that the C-arc tube is a C-shaped circular tube and the D-shaped tube is a D-shaped circular tube, and both ends of the cross section of the (C-shaped) flat elliptic tube perpendicular to the longitudinal direction are circular arcs. Therefore, the roundness of the multi-liner barrel body can be further ensured, and the risk of pulse deformation caused by water pressure in the use process of the electric water heater is reduced.

According to still other embodiments of the present invention, referring to fig. 8, the chord center distance of the plane of the D-shaped pipe may be 30 to 150 degrees, such as 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, 120 degrees, 135 degrees, etc.; in addition, the opening radian of the C-shaped pipe can be 30-150 degrees, for example, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, 120 degrees or 135 degrees, and the inventor finds that if the angle of the plane chord center distance of the D-shaped pipe and/or the opening radian of the C-shaped pipe is too small, the shape of the finally welded multi-pipe welding assembly is still not compact enough, and a large space waste still exists between two adjacent inner container barrels, and if the angle of the plane chord center distance of the D-shaped pipe and/or the opening radian of the C-shaped pipe are too large, for example, 180 degrees respectively, the internal capacity of the multi-inner container barrel is small, the water storage capacity is limited, and the cost performance and the practicability of the product are affected. It should be noted that the D-shaped pipe may be obtained by pressing and/or drawing a circular pipe, and when the arc surface of the D-shaped pipe is a non-circular arc, the plane chord center distance is based on the center of the circular pipe pressed as the D-shaped pipe.

According to still other embodiments of the present invention, before the first and second special pipes are welded, at least one hole may be cut in the plane of the second special pipe, that is, one or more holes may be formed in the planar pulling plate (as shown in 13 in fig. 2) of two adjacent multi-liner barrels, where when there are multiple holes, the multiple holes may be uniformly distributed on the plane of the second special pipe, and it is also desirable to avoid that no hole exists at the welded position of the first and second special pipes, so that the welding effect and the connection strength may be ensured, and the holes in the planar pulling plate connecting two adjacent multi-liner barrels may be further utilized to improve the water circulation in the multi-liner barrel and ensure the water circulation in the multi-liner barrel on the basis of the through end of the finally manufactured multi-liner product.

According to further embodiments of the present invention, the welding process used when welding the first special pipe and the second special pipe is not particularly limited, and those skilled in the art can select the welding process according to actual needs, for example, two long straight steel pipes can be welded by using a welding process such as metal active gas welding (MAG), metal inert gas welding (MIG), or plasma welding (PAW), so as to form a special steel pipe with a tie plate in the middle. Preferably, except for the joint of the first special pipe and the second special pipe, no welding seam exists on the plane pulling plate for connecting the adjacent two multi-liner barrel bodies, so that the capability of the plane pulling plate for resisting water pressure pulse deformation can be further ensured, and the quality and the service life of the multi-liner electric water heater can be further improved.

S300: the multi-tube welded assembly is cut to obtain at least one multi-bladder shell of desired length. According to the embodiment of the present invention, as can be understood by referring to fig. 9, when the first or second special pipe is prepared, the general length of the special pipe is long, and the long first special pipe and second special pipe can be welded in advance and then the multi-pipe welded assembly can be cut to a desired length, thereby further improving the production efficiency, specifically, the maximum speed per minute of the preparation process of the present invention can be used for manufacturing the special steel pipe with the length of 40m, and the length of each barrel body is calculated by the length of 0.5m, the manufacturing of 40 barrel bodies per minute can be realized, which is more than 30 times of the existing barrel body manufacturing process.

According to some embodiments of the present invention, the length of the multi-liner barrel body in the present invention is not particularly limited, and those skilled in the art can select the length according to actual needs, for example, the length of the multi-liner barrel body may be 200 to 1000mm, and specifically may be 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, or 1000mm.

S400: end covers (matched with the end structures of the multi-liner barrel body) are welded at two ends of the multi-liner barrel body so as to obtain a multi-liner product with a through end part. According to the embodiment of the invention, as can be understood by referring to fig. 10, the edge regions of the end covers are matched with the outer edge structures at the two ends of the multi-liner barrel body, the end parts of the multi-liner barrel body can be sealed by welding, and meanwhile, the non-welded parts of the end covers can realize the circulation of (water) between the multi-liner barrel bodies.

According to some embodiments of the present invention, as understood with reference to fig. 10, the end cover may include a plurality of concave surfaces connected in sequence, the plurality of concave surfaces may correspond to end structures of respective special tubes in the multi-liner barrel body one to one, and further, after the end cover is welded to two ends of the multi-liner barrel body, at least a portion of a joint of any two adjacent concave surfaces does not contact with the end of the multi-liner barrel body, that is, a separation space is formed, thereby further ensuring a circulation effect between the multi-liner barrel bodies (water). Preferably, the concave surface can also be a near-spherical surface or a part of a spherical surface or a sphere-like surface, so that the circulation effect of (water) between the barrel bodies of the multi-liner can be ensured, and the water storage capacity of the liner of the electric water heater can be further improved.

According to some further embodiments of the present invention, the end cap may be sleeved on the end of the multi-liner barrel body and welded thereto, or the edge of the end cap may be preferably directly overlapped with the edge of the end of the multi-tube welding assembly for welding, thereby ensuring the welding effect and reducing the raw material cost.

According to still other embodiments of the present invention, when preparing an electric water heater, a water pipe (as understood by referring to 30 in fig. 10) may be welded to a multi-liner product, wherein the water pipe may include a water inlet pipe and a water outlet pipe, so that a complete electric water heater liner can be obtained, and it should be noted that the location of the water pipe is not particularly limited, and a person skilled in the art may select the location according to actual needs, for example, the water pipe may be welded to a multi-liner barrel body, or may be welded to an end cap, and further, the relative location of the water inlet pipe and the water outlet pipe is not particularly limited, and a person skilled in the art may select the location according to actual needs, and furthermore, the water pipe may be a metal water pipe. In addition, it should be noted that, in addition to the water pipe, a workpiece such as a flange may be further welded, and after the welding is completed, a water test may be performed.

According to still other embodiments of the invention, the invention has no special requirements on the material of the special-shaped pipe when the special-shaped pipe is prepared, and a person skilled in the art can select the special-shaped pipe according to actual needs.

In summary, the method for manufacturing the inner container of the electric water heater according to the embodiment of the invention at least has the following advantages: 1. the manufacturing of the compact inner container barrel body can be realized, and the space waste of the appearance structure is reduced; 2. the production efficiency is high, the maximum speed per minute can realize the manufacture of the special-shaped steel pipe with the length of 40m, the length of each barrel body is calculated by 0.5m, the manufacture of 40 barrel bodies per minute can be realized, and the manufacture process is more than 30 times that of the existing barrel body manufacturing process; 3. the processes of blanking, cleaning, forming, welding and cutting can be carried out on one production line, so that one stream of barrel body manufacturing is realized; 4. automatic production can be realized, and manual operation and processing are not needed; 5. the energy utilization rate is higher; 6. the manufacturing of the high-precision barrel body can be realized, the size deviation is only 0.5mm, and is only one tenth of the size tolerance manufactured by the prior art, and the butt welding of the end cover and the barrel body can be effectively ensured by the high-precision barrel body manufacturing method; 7. the welding process is constructed outside the barrel body, the inner surface does not need to be manually polished, and the quality of enamel is favorably improved; 8. the pipe wall plane of the special pipe is used as a plane pulling plate of the multi-liner barrel body to be welded with the special pipe provided with the opening arranged along the length direction, so that the welding procedures and the number of welding seams can be greatly reduced, and the aims of reducing the production cost and improving the production efficiency and the product percent of pass are fulfilled; 9. the manufacturing method has strong material adaptability, can be compatible with the manufacturing of liners with different material grades, and can be compatible with the existing metal material component system.

Based on the same inventive concept, in a further aspect of the invention, the invention also provides the inner container of the electric water heater. According to an embodiment of the present invention, as understood with reference to fig. 2 and fig. 8 to 10, the inner container of the electric water heater includes: the multi-liner barrel body 10 comprises at least two special pipes 11 with equal length, wherein one pipe wall of each two adjacent special pipes 11 is provided with an opening 12 penetrating through the length direction of the pipe wall, the other pipe wall of each two adjacent special pipes 11 is provided with a plane 13, the orthographic projection of the opening 12 on the plane 13 is positioned in the plane 13, and the two adjacent special pipes 11 are connected with each other through the openings 12 and the planes 13 in a welding manner; the two end covers 20 are respectively and independently arranged at two ends of the multi-liner barrel body 10, a concave surface 21 matched with the end structure of the multi-liner barrel body is formed on each end cover 20, the edge of each end cover 20 is welded with the end of the multi-liner barrel body 10 in a sealing mode, and a space is formed between at least one part of the end of each special-shaped pipe 11 and the concave surface 21. Compared with the prior art, the inner container of the electric water heater has the advantages of compact structure, high precision of the inner container barrel body, small quantity of welding lines, good structural stability, higher product quality, longer service life and better market competitiveness.

According to some embodiments of the present invention, the special pipe (which can be regarded as a first special pipe, as understood with reference to (a) and (b) in fig. 2) 11 having an opening through a pipe wall in a length direction thereof may be a C-shaped pipe, and the special pipe (which can be regarded as a second special pipe, as understood with reference to (C) and (D) in fig. 2) 11 having a flat surface may include a D-shaped pipe and/or a flat elliptical pipe, wherein the C-shaped pipe may be selected from a C-shaped arc pipe (preferably a C-shaped circular pipe, i.e., a cross section of the C-shaped pipe perpendicular to the length direction thereof is a circular arc, as understood with reference to fig. 3) and a C-shaped flat elliptical pipe, and the C-shaped pipe may be directly formed by rolling or rolling, or a circular pipe or a flat elliptical pipe may be prepared in advance, and then the C-shaped pipe may be obtained by cutting a flat surface of the D-shaped pipe, or a flat elliptical pipe may be obtained by cutting one of flat surfaces of the D-shaped pipe, and then cutting the C-shaped (flat elliptical) pipe may be prepared by a rolling mill, and then cutting the circular pipe or a rolling mill. The D-shaped pipe is a special-shaped pipe fitting which is formed by enclosing a straight line and an arc (preferably circular arcs, namely the D-shaped pipe can be a D-shaped round pipe as understood by referring to fig. 3) on the cross section perpendicular to the length direction of the D-shaped pipe, the D-shaped pipe can be formed by welding a C-shaped pipe and a flat plate, the D-shaped pipe can be obtained by preparing the round pipe and then pressing or extruding the round pipe, and the D-shaped pipe is obtained by pressing or extruding the round pipe preferentially, so that the welding times of the whole preparation process of the multi-liner barrel body can be further reduced, the number of welding seams of the multi-liner barrel body can be further reduced, and the product qualification rate can be improved and the product quality can be guaranteed. The flat elliptic pipe is a special-shaped pipe fitting (understood by referring to fig. 4) which is formed by enclosing two parallel lines and two arcs respectively connected with two ends of the two parallel lines into an elliptic shape on a cross section perpendicular to the length direction of the flat elliptic pipe, wherein the two arcs respectively connected with two ends of the two parallel lines can be preferably arcs; the C-shaped flat elliptical tube can be understood as a special-shaped tube with one plane cut off from the flat elliptical tube, preferably, two ends of the cross section of the C-shaped flat elliptical tube perpendicular to the length direction of the C-shaped flat elliptical tube are also circular arcs, the flat ellipse can be obtained by pressing or extruding a circular tube, and the C-shaped flat elliptical tube can be directly rolled or can be obtained by cutting one plane of the flat elliptical tube.

According to still other embodiments of the present invention, an orthographic projection area of the opening 12 arranged in the length direction of the tube wall of the first special pipe on the tube wall plane 13 of the second special pipe may be equal to an area of the tube wall plane 13 of the second special pipe, and preferably, an orthographic projection edge of the opening arranged in the length direction of the tube wall of the first special pipe on the tube wall plane of the second special pipe coincides with a tube wall plane edge of the second special pipe. The number of the inner containers of the multi-inner-container barrel 10 is not particularly limited, and may be selected by those skilled in the art according to actual needs, and for example, the multi-inner-container barrel 10 may have a double-inner-container structure, a 3-inner-container structure, or a 4-inner-container structure.

According to further embodiments of the present invention, as shown in fig. 8, the chord center distance of the plane of the D-shaped pipe may be 30 to 150 degrees, such as 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, 120 degrees, 135 degrees, etc.; in addition, the opening radian of the C-shaped pipe can be 30-150 degrees, for example, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, 120 degrees or 135 degrees, and the inventor finds that if the angle of the plane chord center distance of the D-shaped pipe and/or the opening radian of the C-shaped pipe is too small, the shape of the multi-liner barrel is still not compact enough, and a large space waste still exists between two adjacent inner liner barrels, and if the angle of the plane chord center distance of the D-shaped pipe and/or the opening radian of the C-shaped pipe are too large, for example, 180 degrees respectively, the internal capacity of the multi-liner barrel is small, the water storage capacity is limited, and the cost performance and the practicability of the product are affected. The length of the multi-liner barrel 10 is not particularly limited, and may be selected by those skilled in the art according to actual needs, for example, the length of the multi-liner barrel may be 200 to 1000mm, specifically 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, or 1000mm.

According to further embodiments of the present invention, at least one opening (not shown) may be disposed on the plane 13 connecting two adjacent special tubes 11, so as to form one or more holes on the plane pulling plate of two adjacent multi-liner barrels, wherein when there are a plurality of holes, the plurality of holes may be uniformly distributed on the plane 13 of the special tubes, and at the same time, it is avoided that no holes exist at the welding position of the two special tubes, thereby ensuring the welding effect and the connection strength, and further improving the water circulation in the multi-liner barrels by using the holes on the plane pulling plate connecting two adjacent multi-liner barrels on the basis of the through end of the finally manufactured multi-liner product, and ensuring the water circulation effect in the multi-liner barrels.

According to further embodiments of the present invention, the end cap 20 may include a plurality of concave surfaces 21 connected in sequence, the plurality of concave surfaces 21 may correspond to end structures of the tubes in the multi-liner barrel 10 one by one, and further, after the end cap is welded to two ends of the multi-liner barrel, at least a part of a joint of any two adjacent concave surfaces does not contact with the end of the multi-liner barrel, that is, a separation space is formed, thereby further improving a circulation effect between the multi-liner barrels (water). Preferably, the concave surface can also be an approximately spherical surface or a part of a spherical surface or a sphere-like surface, so that the circulation effect of (water) between the barrel bodies of the multi-liner can be ensured, and the water storage capacity of the liner of the electric water heater can be further improved. In addition, the end cover can be sleeved on the end part of the multi-liner barrel body and welded with the end part of the multi-liner barrel body, and the edge of the end cover can be preferably and directly overlapped with the edge of the end part of the multi-tube welding assembly to be welded, so that the welding effect can be ensured, and the cost of raw materials can be reduced.

According to still other embodiments of the present invention, the liner of the electric water heater may further include a water pipe 30, wherein the water pipe 30 may include a water inlet pipe and a water outlet pipe, so that a complete liner of the electric water heater may be obtained, and it should be noted that the arrangement position of the water pipe is not particularly limited, and a person skilled in the art may select the water pipe according to actual needs, for example, the water pipe may be welded on the multiple-liner barrel body, or may be welded on the end cover, and in addition, the relative position of the water inlet pipe and the water outlet pipe is not particularly limited, and a person skilled in the art may select the water pipe according to actual needs, and furthermore, the water pipe may be a metal water pipe. In addition, it should be noted that, in addition to the water pipe, a workpiece such as a flange may be further welded, and after the welding is completed, a water test may be performed.

According to still other embodiments of the invention, the inner container of the electric water heater can be preferably prepared by adopting the method for preparing the inner container of the electric water heater, so that the manufacturing of the compact inner container barrel body is more favorably realized, the space waste of the appearance structure is reduced, the production efficiency can be improved, the processes of blanking, cleaning, forming, welding and cutting can be carried out on one production line, one flow of barrel body manufacturing is realized, meanwhile, the automatic production can be realized, the manual operation and processing are not needed, the manufacturing of the high-precision barrel body can be realized, the number of welding seams is reduced, the product quality and the qualification rate are improved, and the energy utilization rate is improved.

It should be noted that the method for preparing the liner of the electric water heater and the liner of the electric water heater are provided based on the same inventive concept, and the features and effects described in the method for preparing the liner of the electric water heater are also applicable to the liner of the electric water heater, and are not described in detail herein.

In summary, compared with the prior art, the preparation of the inner container of the electric water heater in the embodiment of the invention has at least the following advantages: 1. the multi-inner-container barrel body has a compact structure and high space utilization rate; 2. the inner container barrel body has high precision, the size deviation is only 0.5mm, the size deviation is only one tenth of the size tolerance manufactured by the prior art, and the butt welding effect of the end cover and the barrel body is good; 3. the enamel quality of the inner surface of the inner container barrel body is high; 4. the number of welding seams is small, the product quality is high, and the production cost is low; 5. the method can be suitable for different material grades and the existing metal material component systems; 6. the structure stability is good, the risk of water pressure pulse deformation is small, and the service life is longer.

In yet another aspect of the present invention, an electric water heater is provided. According to the embodiment of the invention, the inner container of the electric water heater is provided with the inner container of the electric water heater or the inner container of the electric water heater prepared by the method for preparing the inner container of the electric water heater. Compared with the prior art, the electric water heater has the advantages of compact appearance structure, high space utilization rate, high product precision, good quality, better structural stability and longer service life. It should be noted that, the features and effects described for the liner of the electric water heater and the method for manufacturing the liner of the electric water heater are also applicable to the electric water heater, and are not described in detail herein.

In the description of the present invention, it is to be understood that the terms "center," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the positional or orientational relationships indicated in the drawings to facilitate the description of the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (20)

1. A method of making an electric water heater liner, comprising:

(1) Preparing at least one first special pipe and at least one second special pipe, wherein the pipe wall of the first special pipe is provided with an opening arranged along the length direction of the first special pipe, the pipe wall of the second special pipe is provided with a plane, and the orthographic projection of the opening on the plane is positioned inside the plane;

(2) Welding the opening of the first special pipe and the plane of the second special pipe so as to obtain a multi-pipe welding assembly with two adjacent pipe fittings connected through a plane pulling plate;

(3) Cutting the multi-tube welding assembly to obtain at least one multi-liner barrel body with a desired length;

(4) And end covers are welded at two ends of the multi-liner barrel body so as to obtain a multi-liner product with a through end part.

2. The method according to claim 1, wherein in step (1), the first profile pipe is a C-shaped pipe, the second profile pipe comprises a D-shaped pipe and/or a flat oval pipe, and the C-shaped pipe comprises a C-shaped arc pipe and/or a C-shaped flat oval pipe.

3. The method of claim 2, wherein step (1) satisfies at least one of the following conditions:

the C-shaped pipe, the D-shaped pipe and the flat elliptical pipe are respectively and independently formed directly by rolling or rolling;

preparing a circular tube in advance, and cutting the circular tube to obtain the C-shaped tube;

preparing a circular tube in advance, and then carrying out extrusion forming on the circular tube to obtain the D-shaped tube or the flat elliptical tube;

and cutting the plane of the D-shaped pipe to obtain the C-shaped pipe, and cutting one plane of the flat elliptic pipe to obtain the C-shaped flat elliptic pipe.

4. The method of claim 2, wherein the circular tube, the D-shaped tube, and the flat elliptical tube are each independently straight slit steel tubes, and the welds of the D-shaped tube and the flat elliptical tube are each independently located in a non-planar region.

5. A method according to any one of claims 2 to 4, wherein in step (2), the multiple tube welding assembly comprises:

1 of said C-tubes and 1 of said D-tubes; alternatively, the first and second electrodes may be,

2 of said C-shaped tubes and 1 of said flat oval tubes; alternatively, the first and second electrodes may be,

1 said C-arc tube, at least 1 said C-flat oval tube, and 1 said D-tube; alternatively, the first and second liquid crystal display panels may be,

2 the C-shaped arc tubes, 1 the flat oval tube and at least 1 the C-shaped flat oval tube.

6. The method of claim 5, wherein the C-arc tube and the D-tube are symmetrical with respect to a planar configuration of the D-tube.

7. The method of claim 2 or 6, wherein the D-shaped tube has a plane chord center distance of 30 to 150 degrees; and/or the opening radian of the C-shaped pipe is 30-150 degrees.

8. The method according to any one of claims 1 to 4, wherein in step (1), an area of an orthographic projection of the opening on the plane is equal to an area of the plane.

9. The method according to any one of claims 1 to 4, further comprising, before performing step (2): at least one hole is cut in the plane.

10. The method according to any one of claims 1 to 4, wherein in the step (2), the length of the multi-liner barrel body is 200-1000 mm.

11. The method of any one of claims 1 to 4, wherein the end cap comprises a plurality of sequentially connected concave surfaces, the plurality of concave surfaces corresponding one-to-one with an end structure of each of the profile tubes in the multi-bladder shell.

12. The method of claim 11, wherein an edge of the end cap coincides with an end edge of the multi-tube welding assembly.

13. The method of claim 1 or 12, further comprising:

(5) And welding a water pipe on the multi-liner product so as to obtain the liner of the electric water heater.

14. The method of claim 13, wherein the water tube is welded to the multi-bladder shell and/or to the end cap.

15. An inner container of an electric water heater is characterized by comprising:

the multi-liner barrel body comprises at least two special pipes with equal length, one pipe wall of every two adjacent special pipes is provided with an opening penetrating through the length direction of the special pipes, the other pipe wall of every two adjacent special pipes is provided with a plane, the orthographic projection of the opening on the plane is positioned in the plane, and the two adjacent special pipes are connected with the plane through the openings in a welded mode;

the end covers are respectively and independently arranged at two ends of the multi-inner-container barrel body, concave surfaces matched with the end structures of the multi-inner-container barrel body are formed on the end covers, the edges of the end covers are in sealed welding with the ends of the multi-inner-container barrel body, and at least one part of the end part of each special-shaped pipe and an interval space is formed between the concave surfaces.

16. The liner of claim 15, wherein the special pipe with the opening through the pipe wall in the length direction is a C-shaped pipe, the special pipe with the flat surface on the pipe wall comprises a D-shaped pipe and/or a flat oval pipe, and the C-shaped pipe comprises a C-shaped arc pipe and/or a C-shaped flat oval pipe.

17. The liner of claim 15, wherein at least one opening is formed on a plane connecting two adjacent profiled tubes.

18. The liner of claim 15, further comprising: the water pipe is arranged on the multi-liner barrel body and/or the end cover.

19. The liner of any one of claims 15 to 18, which is prepared by the method of any one of claims 1 to 14.

20. An electric water heater is characterized in that the electric water heater liner as claimed in any one of claims 15 to 19 or the electric water heater liner prepared by the method as claimed in any one of claims 1 to 14 is provided.

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