CN114576860A - Hollow riveted through type composite flexible connecting structure of double-liner electric water heater - Google Patents
Hollow riveted through type composite flexible connecting structure of double-liner electric water heater Download PDFInfo
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- CN114576860A CN114576860A CN202210088111.7A CN202210088111A CN114576860A CN 114576860 A CN114576860 A CN 114576860A CN 202210088111 A CN202210088111 A CN 202210088111A CN 114576860 A CN114576860 A CN 114576860A
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- liner
- inner container
- connecting pipeline
- water heater
- electric water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/14—Arrangements for connecting different sections, e.g. in water heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Abstract
The invention belongs to the technical field of electric water heaters, and particularly relates to a hollow riveted through type composite flexible connecting structure of a double-liner electric water heater. In order to reliably connect the upper inner container and the lower inner container of the electric water heater, avoid welding defects caused by welding, ensure effective sealing of a connecting pipeline by communicating the upper inner container and the lower inner container and reduce the distance between the inner containers as much as possible, the invention provides the technical scheme of the composite flexible connecting structure of the hollow riveted through type double-container electric water heater. The invention relates to a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater, which comprises an upper liner, a lower liner and an upper liner connecting pipeline, wherein the lower liner is connected with the pipeline; the upper liner and the upper liner are connected into a whole through a connecting pipeline, and the lower liner are connected into a whole through a connecting pipeline; the upper liner connecting pipeline and the lower liner connecting pipeline are riveted together. The invention has the advantages that: the sealing is reliable, and no welding stress exists; the distance between the two inner containers is small, and the space occupation of the water heater is reduced.
Description
Technical Field
The invention belongs to the technical field of electric water heaters, and particularly relates to a hollow riveted through type composite flexible connecting structure of a double-liner electric water heater.
Background
With the improvement of the living demands of people, the electric water heater is not required to be installed in different rooms, does not generate harmful gas, is fast and convenient in temperature adjustment, is safe and reliable, and is selected by thousands of households as a household appliance. As one of the common electric water heaters, the dual-bladder electric water heater has fast heating and variable volume functions, and is therefore favored by more and more users. In the prior art, the through type electric water heater with double inner containers comprises an upper inner container, a lower inner container and two connecting pipes for communicating the upper inner container and the lower inner container. Because the influence of processing and installation error, top tube and low tube in two connecting pipes are difficult to the centering, adopt welding process's the inside welding tumor that exists of connecting pipe, need the manual work to polish, and waste time and energy, have insufficient solder, lack the hidden danger of welding simultaneously, need further strengthen the quality inspection, reduced production efficiency, increased manufacturing cost.
CN205536499U discloses a water heater with a through anode device, the electric water heater disclosed in the patent technical solution includes two inner containers, and also discloses that the two inner containers are mutually through, but does not provide a technical problem how to solve the sealing and penetrating of the two inner containers.
CN208253943U discloses an electric water heater double inner container structure, and this technical scheme's double inner container is for erectting the setting side by side, and two inner container connecting line spaces are spacious, and the sealed connection problem is very solved to current technical scheme. However, the technical scheme cannot solve the problem of sealing the upper liner and the lower liner which are connected in a penetrating way, and particularly when the distance between the two liners needs to be shortened as much as possible, the existing technical scheme is implemented due to insufficient operation space.
CN203586523U discloses an electromagnetic water storage type ultrathin water heater with two inner containers, which does not disclose a sealing connection technical solution of a connection pipe between two inner containers, nor indicates how to reduce the distance between two inner containers on the premise of ensuring sealing.
In the prior art, the whole space is enlarged due to overlarge distance between the two inner containers; the welding stress can cause the inner container to generate electrochemical reaction to corrode along with the time; the welding operation and control difficulty in a narrow space is high, and the quality reliability is reduced.
In order to reliably connect the upper inner container and the lower inner container, avoid welding defects caused by welding, ensure effective sealing of a connecting pipeline by communicating the upper inner container and the lower inner container and reduce the distance between the inner containers as much as possible, the invention solves the technical problems by providing the technical scheme of the composite flexible connecting structure of the hollow riveted through type double-container electric water heater.
Disclosure of Invention
The invention aims to provide a technical scheme of a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater to solve the technical problems.
In the technical scheme of the invention, the orientation terms such as upper liner, lower liner, upper connecting pipeline and lower connecting pipeline in the technical scheme of the invention are not only the position of the product when being installed, but also the orientation of a certain view in the attached drawings of the specification, and are distinguished for the convenience of description. Similarly, the term "convex" and "concave" in the present specification are only used to express that the cross section of a certain technical feature extends or sweeps to a certain direction along the axis, and the same description effect can be achieved by using "convex" or "concave" or other similar words, and the term "convex" and "concave" in the present specification is not the only explanation of the technical solution of the present invention.
The invention is realized by adopting the following technical scheme:
the invention relates to a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater, which comprises an upper liner, a lower liner, an upper liner connecting pipeline and a lower liner connecting pipeline, wherein the upper liner is connected with the lower liner through the upper liner; the upper liner and the upper liner are connected into a whole through a connecting pipeline, and the lower liner are connected into a whole through a connecting pipeline; the upper liner connecting pipeline and the lower liner connecting pipeline are riveted together.
Furthermore, the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater is characterized in that the upper liner and the lower liner are integrally cylindrical, the middle parts of the upper liner and the lower liner are in arc dome shapes, and one end of the upper liner and the lower liner is provided with a process hole; the root of the joint of the upper liner connecting pipeline and the upper liner is a platform which protrudes out of the cylindrical bus of the upper liner; the upper liner connecting pipeline protrudes into the upper liner; the root of the joint of the lower liner connecting pipeline and the lower liner is a platform which is protruded out of a cylindrical bus of the lower liner; the lower liner connecting pipeline protrudes out of the lower liner; the lower liner connecting pipeline is inserted into the upper liner connecting pipeline and riveted with the upper liner connecting pipeline.
Furthermore, the periphery of the riveted joint in the connecting pipeline of the upper liner and the connecting pipeline of the lower liner is sealed by brazing.
Furthermore, the invention relates to a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater, wherein a sealing gasket is arranged between an upper liner connecting pipeline and a lower liner connecting pipeline.
Furthermore, the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater is characterized in that the upper liner connecting pipeline is formed by punching a platform protruding out of a cylindrical bus of the upper liner and then flanging the platform; the lower liner connecting pipeline is formed by punching a rear hole of a platform which protrudes out of a cylindrical bus of the lower liner.
Furthermore, the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater is characterized in that an upper liner connecting pipeline is welded with a perforated platform protruding out of a cylindrical bus of the upper liner; and the lower liner connecting pipeline is welded with the perforated platform protruding out of the cylindrical bus of the lower liner.
Furthermore, the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater further comprises a hanging mechanism and strapping tapes, wherein the hanging mechanism is fixedly connected with the upper liner and the lower liner simultaneously, and the number of the hanging mechanisms is 2; the upper liner and the lower liner are fixedly bound together by the binding belt.
Furthermore, the invention relates to a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater, wherein the upper liner comprises a left half liner and a right half liner; the left half liner and the right half liner are welded together; the lower inner container comprises a left half inner container and a right half inner container; the left half liner and the right half liner are welded together; the left and right half-liners of the upper inner liner are formed by drawing metal plates, and the left and right half-liners of the lower inner liner are formed by drawing metal plates.
The invention relates to a processing method of a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater, which comprises the following steps:
1) the left and right half liners of the upper liner are respectively formed by deep drawing, and the left and right half liners of the lower liner are respectively formed by deep drawing;
2) the left inner container platform and the right inner container platform of the upper inner container are respectively stamped, and the left inner container platform and the right inner container platform of the lower inner container are respectively stamped;
3) respectively blanking holes on the left inner container platform and the right inner container platform of the upper inner container, and respectively blanking holes on the left inner container platform and the right inner container platform of the lower inner container;
4) holes on the left inner container platform and the right inner container platform of the upper inner container are respectively turned to form a convex lower inner container connecting pipeline, and holes on the left inner container platform and the right inner container platform of the lower inner container are respectively turned to form a concave upper inner container connecting pipeline;
5) inserting the lower liner connecting pipelines on the left and right liner platforms of the lower liner into the upper liner connecting pipelines on the left and right liner platforms of the corresponding upper liner and riveting the upper liner connecting pipelines respectively;
6) respectively welding the left inner container and the right inner container of the lower inner container; and respectively welding the left inner container and the right inner container of the upper inner container.
Further, the processing method of the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater is characterized in that in the step 4), the lower liner connecting pipelines on the left and right liner platforms of the upper liner are formed by welding, and the upper liner connecting pipelines on the left and right liner platforms of the lower liner are formed by welding.
The invention has the advantages that: (1) the riveting connection mode is adopted, the joint is naturally transited from the inner containers without extra welding, and the riveting positions of the two inner containers are lined with sealing gaskets, so that the sealing is reliable and no welding stress exists; (2) the two inner containers can be as close as possible without the problem of insufficient operation space; (3) the operation is simple, the efficiency is high, the cost is low, and the cost performance is high; (4) the process has good adaptability, and can be suitable for the through connection of the water heater inner containers with different specifications and diameters.
Drawings
FIG. 1 is a three-dimensional schematic view of a composite flexible connection structure of a hollow riveted through type double-liner electric water heater according to the invention;
FIG. 2 is an end projection view of the composite flexible connection structure of the hollow riveted through type double-liner electric water heater according to the present invention;
FIG. 3 is a longitudinal section view of the composite flexible connection structure of the hollow riveted through type double-liner electric water heater according to the present invention;
FIG. 4 is a cross sectional view of a composite flexible connection structure of a hollow riveted through type double-liner electric water heater according to the present invention;
FIG. 5 is a partial enlarged view of a connecting pipeline part of a composite flexible connecting structure of the hollow riveted through type double-liner electric water heater of the invention;
FIG. 6 is a partial enlarged view of a connecting pipeline part of a composite flexible connecting structure of the hollow riveted through type double-liner electric water heater of the invention;
the symbols in the drawings illustrate that: 1. an upper inner container; 2. a lower inner container; 3. the upper liner is connected with a pipeline; 4. the lower liner is connected with a pipeline; 5. a fabrication hole; 6. a hanging mechanism; 7. and (4) strapping tapes.
Detailed Description
The technical solutions in the embodiments of the present invention will be further described below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention.
Example 1:
as shown in fig. 1-5, the composite flexible connection structure of the hollow riveted through type double-liner electric water heater comprises an upper liner 1, a lower liner 2, an upper liner connecting pipeline 3 and a lower liner connecting pipeline 4; the upper liner 1 and the upper liner connecting pipeline 3 are connected into a whole, and the lower liner 2 and the lower liner connecting pipeline 4 are connected into a whole; the upper liner connecting pipeline 3 and the lower liner connecting pipeline 4 are riveted together.
Further, the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater is characterized in that the upper liner 1 and the lower liner 2 are integrally cylindrical in the middle, arc dome-shaped at two ends and provided with a process hole 5 at one end; the root of the joint of the upper liner connecting pipeline 3 and the upper liner 1 is a platform which protrudes out of a cylindrical bus of the upper liner 1; the upper liner connecting pipeline 3 protrudes into the upper liner 1; the root of the joint of the lower liner connecting pipeline 4 and the lower liner 2 is a platform which protrudes out of a cylindrical bus of the lower liner 2; the lower liner connecting pipeline 4 protrudes out of the lower liner 2; the lower liner connecting pipeline 4 is inserted into the upper liner connecting pipeline 3 and riveted with the upper liner connecting pipeline in a hole flanging way.
Furthermore, in the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater, a sealing gasket is arranged between the upper liner connecting pipeline 3 and the lower liner connecting pipeline 4.
Furthermore, the invention relates to a hollow riveted through type composite flexible connecting structure of a double-liner electric water heater, wherein an upper liner connecting pipeline 3 is formed by punching a platform protruding out of a cylindrical bus of an upper liner 1 and then flanging the platform; the lower liner connecting pipeline 4 is formed by punching a platform protruding out of a cylindrical bus of the lower liner 2 and then flanging the platform.
Furthermore, the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater further comprises a hanging mechanism 6 and a strapping tape 7, wherein the hanging mechanism 6 is fixedly connected with the upper liner 1 and the lower liner 2 at the same time, and the number of the hanging mechanisms 6 is 2; the upper liner 1 and the lower liner 2 are bound and fixed together by the binding belt 7; at least two strapping bands 7 are provided.
Furthermore, the invention relates to a hollow riveted through type composite flexible connecting structure of a double-liner electric water heater, wherein the upper liner 1 comprises a left half liner and a right half liner; the left half liner and the right half liner are welded together; the lower liner 2 comprises a left half liner and a right half liner; the left half liner and the right half liner are welded together; the left and right half liners of the upper liner 1 are formed by drawing metal plates, and the left and right half liners of the lower liner 2 are formed by drawing metal plates.
The invention relates to a processing method of a composite flexible connecting structure of a hollow riveted through type double-liner electric water heater, which comprises the following steps:
1) the left and right half liners of the upper liner 1 and the left and right half liners of the lower liner 2 are respectively formed by deep drawing;
2) respectively stamping the left and right inner container platforms of the upper inner container 1 and the left and right inner container platforms of the lower inner container 2;
3) respectively blanking holes on the left inner container platform and the right inner container platform of the upper inner container 1, and respectively blanking holes on the left inner container platform and the right inner container platform of the lower inner container 2;
4) holes on the left inner container platform and the right inner container platform of the upper inner container 1 are respectively turned to form a convex lower inner container connecting pipeline 3, and holes on the left inner container platform and the right inner container platform of the lower inner container 1 are respectively turned to form a concave upper inner container connecting pipeline 4;
5) inserting the lower liner connecting pipelines 3 on the left and right liner platforms of the lower liner 1 into the upper liner connecting pipelines 4 on the left and right liner platforms of the corresponding upper liner 2 and riveting the same respectively;
6) respectively welding the left inner container and the right inner container of the lower inner container 1; the left and right inner containers of the upper inner container 2 are welded respectively.
The technical scheme of the invention has the advantages that: (1) the riveting connection mode is adopted, the joint is naturally transited from the inner container without extra welding, and larger external load can be borne; (2) the riveting positions of the two inner containers are lined with sealing gaskets, so that the sealing is reliable, and no welding stress exists; (3) the two inner containers can be as close as possible without the problem of insufficient operation space; (4) the operation is simple, the efficiency is high, the cost is low, and the cost performance is high; (5) the process has good adaptability, and can be suitable for the through connection of the water heater inner containers with different specifications and diameters.
Example 2:
as shown in fig. 1-6, the difference between the embodiment 2 and the embodiment 1 is that in the processing method of the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater of the present invention, in the step 4), the lower liner connecting pipelines on the left and right liner platforms of the upper liner are welded, and the upper liner connecting pipelines on the left and right liner platforms of the lower liner are welded. The technical scheme of the invention has the advantages that: the process is simple, easy to realize and reliable in sealing.
Example 3:
as shown in fig. 1 to 6, the difference between the embodiment 3 and the embodiment 1 lies in that the periphery of the riveted joint in the upper liner connecting pipeline and the lower liner connecting pipeline of the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater of the invention is sealed by brazing, so that reliable and permanent sealing can be realized.
Example 4:
as shown in fig. 1-4 and 6, the difference between the embodiment 4 and the embodiment 1 is that the upper liner connecting pipeline 3 of the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater of the invention is welded with the perforated platform 5 protruding out of the cylindrical bus of the upper liner 1; and the lower liner connecting pipeline 4 is welded with a perforated platform protruding out of the cylindrical bus of the lower liner 2. The connecting pipeline and the inner container are fixed by welding, the process is simple, the existing process is not required to be modified, and the implementation period in actual production is short.
The foregoing embodiments are merely exemplary for the purpose of clearly illustrating the invention and it will be apparent to those skilled in the art that variations and modifications are possible in light of the above teachings and all such variations and modifications are considered to be within the scope of the invention.
Claims (10)
1. A hollow riveted through type composite flexible connecting structure of a double-liner electric water heater is characterized by comprising an upper liner, a lower liner, an upper liner connecting pipeline and a lower liner connecting pipeline; the upper liner and the upper liner are connected into a whole through a connecting pipeline, and the lower liner are connected into a whole through a connecting pipeline; the upper liner connecting pipeline and the lower liner connecting pipeline are riveted together.
2. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in claim 1, wherein the whole upper liner and the whole lower liner are both cylindrical in the middle, arc dome-shaped at two ends and a fabrication hole is arranged at one end; the root of the joint of the upper liner connecting pipeline and the upper liner is a platform which protrudes out of the cylindrical bus of the upper liner; the upper liner connecting pipeline protrudes into the upper liner; the root of the joint of the lower liner connecting pipeline and the lower liner is a platform which is protruded out of a cylindrical bus of the lower liner; the lower liner connecting pipeline protrudes out of the lower liner; the lower liner connecting pipeline is inserted into the upper liner connecting pipeline and riveted with the upper liner connecting pipeline in a hole flanging way.
3. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in claim 2, wherein the periphery of the riveted part in the upper liner connecting pipeline and the lower liner connecting pipeline is sealed by brazing.
4. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in claim 2, wherein a sealing gasket is arranged between the upper liner connecting pipeline and the lower liner connecting pipeline.
5. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in claim 2, wherein the upper liner connecting pipeline is formed by punching a platform protruding out of a cylindrical bus bar of the upper liner and then flanging the platform; the lower liner connecting pipeline is formed by punching a rear hole of a platform which protrudes out of a cylindrical bus of the lower liner.
6. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in claim 2, wherein the upper liner connecting pipeline is welded with a perforated platform protruding out of the cylindrical bus bar of the upper liner; and the lower liner connecting pipeline is welded with the perforated platform protruding out of the cylindrical bus of the lower liner.
7. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in claim 2, further comprising a hanging mechanism and a strapping tape, wherein the hanging mechanism is fixedly connected with the upper liner and the lower liner at the same time; the upper liner and the lower liner are fixedly bound together by the binding belt.
8. The composite flexible connecting structure of the hollow riveted through type double-liner electric water heater as claimed in any one of claims 1 to 7, wherein the upper liner comprises a left half liner and a right half liner; the left half liner and the right half liner are welded together; the lower liner comprises a left half liner and a right half liner; the left half liner and the right half liner are welded together; the left and right half-liners of the upper inner liner are formed by drawing metal plates, and the left and right half-liners of the lower inner liner are formed by drawing metal plates.
9. The processing method of the composite flexible connecting structure of the hollow riveted through type double-liner electric water heater according to any one of claims 1 to 7, characterized by comprising the following steps:
1) the left and right half liners of the upper liner are respectively formed by deep drawing, and the left and right half liners of the lower liner are respectively formed by deep drawing;
2) the left inner container platform and the right inner container platform of the upper inner container are respectively stamped, and the left inner container platform and the right inner container platform of the lower inner container are respectively stamped;
3) respectively blanking holes on the left inner container platform and the right inner container platform of the upper inner container, and respectively blanking holes on the left inner container platform and the right inner container platform of the lower inner container;
4) holes in the left inner container platform and the right inner container platform of the upper inner container are respectively turned to form convex lower inner container connecting pipelines, and holes in the left inner container platform and the right inner container platform of the lower inner container are respectively turned to form concave upper inner container connecting pipelines;
5) inserting the lower liner connecting pipelines on the left and right liner platforms of the lower liner into the upper liner connecting pipelines on the left and right liner platforms of the corresponding upper liner and riveting the upper liner connecting pipelines respectively;
6) respectively welding the left inner container and the right inner container of the lower inner container; and respectively welding the left inner container and the right inner container of the upper inner container.
10. The processing method of the hollow riveted through type double-liner electric water heater composite flexible connection structure according to claim 9, characterized in that in the step 4), the lower liner connection pipelines on the left and right liner platforms of the upper liner are formed by welding, and the upper liner connection pipelines on the left and right liner platforms of the lower liner are formed by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210088111.7A CN114576860A (en) | 2022-01-25 | 2022-01-25 | Hollow riveted through type composite flexible connecting structure of double-liner electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210088111.7A CN114576860A (en) | 2022-01-25 | 2022-01-25 | Hollow riveted through type composite flexible connecting structure of double-liner electric water heater |
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| CN114576860A true CN114576860A (en) | 2022-06-03 |
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| CN202210088111.7A Pending CN114576860A (en) | 2022-01-25 | 2022-01-25 | Hollow riveted through type composite flexible connecting structure of double-liner electric water heater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208332691U (en) * | 2018-04-08 | 2019-01-04 | 艾欧史密斯(中国)热水器有限公司 | Water heater liner component and electric heater |
| CN111331772A (en) * | 2018-12-18 | 2020-06-26 | 青岛经济技术开发区海尔热水器有限公司 | Preparation method of double-liner water heater and double-liner water heater |
| WO2021164774A1 (en) * | 2020-02-20 | 2021-08-26 | 芜湖美的厨卫电器制造有限公司 | Inner container structure and water-storage-type water heater |
| CN217082939U (en) * | 2022-01-25 | 2022-07-29 | 青岛理工大学 | Composite flexible connecting structure of hollow riveting through type electric water heater double containers |
-
2022
- 2022-01-25 CN CN202210088111.7A patent/CN114576860A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208332691U (en) * | 2018-04-08 | 2019-01-04 | 艾欧史密斯(中国)热水器有限公司 | Water heater liner component and electric heater |
| CN111331772A (en) * | 2018-12-18 | 2020-06-26 | 青岛经济技术开发区海尔热水器有限公司 | Preparation method of double-liner water heater and double-liner water heater |
| WO2021164774A1 (en) * | 2020-02-20 | 2021-08-26 | 芜湖美的厨卫电器制造有限公司 | Inner container structure and water-storage-type water heater |
| CN217082939U (en) * | 2022-01-25 | 2022-07-29 | 青岛理工大学 | Composite flexible connecting structure of hollow riveting through type electric water heater double containers |
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