Patent Application
20230358442
This application claims the benefit of priority from Chinese Patent Application No. 202310073932.8, filed on Jan. 16, 2023. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference in its entirety.
The disclosure relates to household water heaters, and more specifically to a tooling and method for flexible through connection between double liners of a water heater.
Double-liner electric water heater is a structurally- and functionally-new storage electric water heater developed based on the single-liner water heater. The double-liner electric water heater is energy-saving and fast in heating speed, can simultaneously store cold water and hot water, and has large water storage capacity, satisfying different requirements according to actual conditions.
At present, the exist double-liner electric water heater includes an upper liner and a lower liner connected through a connecting part, that is, the upper liner and the lower liner each are welded to a connecting pipe, and then assemble the entire part. Unfortunately, the gap between the upper liner and the lower liner is large (larger than 30 mm), resulting in large size and excessive space occupation. In addition, a water-passing hole of the connecting pipe is thin and long, such that the subsequent integral enamel process is difficult, water leakage and water seepage are easy to occur, and the service life of a welding seam is reduced.
Regarding the compact connection, (that is, a gap between the upper and lower liners is less than or equal to 7 mm), there is not operation space, thus unable to weld.
In order to solve the above-mentioned technical problems, the disclosure provides a tooling and method for flexible through connection between double liners of a water heater. It realizes a connection with a gap two liners less than or equal to 7 mm. A water-passing connecting pipe is short, and an inner hole thereof is easy to enamel. Water-passing holes of the upper liner and the lower liner are centered after welding, contributing to utilization of the double-liner structure.
Technical solutions of this application are described as follows.
In a first aspect, this application provides a tooling for flexible through connection of a double-liner water heater, comprising:
In a second aspect, this application provides a method for flexible through connection of a double-liner water heater by using the above-mentioned tooling, wherein a gap between the upper liner and the lower liner is less than or equal to 7 mm, and the method comprises:
The first seal ring is arranged on the bottom surface of the inner flange, and the second seal ring is arranged on the cylindrical surface of the inner flange, which enhances the flexibility and reliability of the connection to prevent water leakage and seepage.
In some embodiments, in step (a), the bottom surface of the inner flange is provided with a recess structure to reduce the force-bearing area and increase the pressure, which improves the tightness to prevent water leakage and seepage.
In some embodiments, in step (a), the first welding assembly hole and the inner flange are in clearance fit; the second welding assembly hole and the outer flange are in clearance fit.
In some embodiments, in step (a), a diameter of the tooling connection part is the same as a diameter of a flange connection part; the shaft head of the transition shaft and the outer flange are in tight centering clearance fit with excellent precision, and the end hole of the transition shaft and the inner flange are in tight centering clearance fit with excellent precision, such that the gap between the upper liner and the lower liner satisfies the welding process requirement.
In some embodiments, in step (a), a center distance between two transition shafts is equal to a center distance of water-passing holes of the upper liner and the lower liner.
In some embodiments, in step (a), the transition shaft is fixed to the tooling connecting plate by using the hexagon socket set screw with cone point, so as to ensure that the transition shaft and the tooling connecting plate are in centering clearance fit.
In some embodiments, in step (a), the inner flange in fitting manner with the end hole of the transition shaft is welded to the upper liner; and the outer flange in fitting manner with the shaft head of the transition shaft is welded to the lower liner.
In some embodiments, in step (a), the end hole of the transition shaft of the dual liner through composite flexible connection tooling of the water heater is assembled and welded with the inner flange of the upper liner, and the shaft head of the transition shaft is assembled and welded with the outer flange of the lower liner.
In some embodiments, in step (a), the central axis of the first welding assembly hole and the central axis of the second welding assembly hole are located in the same line; central axes of the transition shaft, the end hole and the shaft head coincide with each other, and coincide with a central axis of the outer flange and a central axis of the inner flange.
In some embodiments, in step (a), the bottom surface of the inner flange is matched with a bottom surface of the outer flange; and the bottom surface of the inner flange is perpendicular to the central axis of the inner flange, and the bottom surface of the outer flange is perpendicular to the central axis of the outer flange. During assembling the inner flange and the outer flange, the first seal ring is arranged on the bottom surface of the inner flange, and the second seal ring is arranged on the cylindrical surface of the inner flange, which enhances flexibility and reliability to prevent water leakage and seepage.
Compared to the prior art, this application has the following beneficial effects.
The tooling and method for flexible through connection provided herein realize a tight connection of the double-liner water heater, which is within 7 mm, avoiding a large gap between the two liners and reducing space occupation. The length of the water-passing hole is reduced, which simplifies the enamel process, prevent water leakage and seepage at the connection part, and greatly extending the service life of welding seams. This application provides a method for small gap connection between two liners, that is, provides the tooling and method for flexible through connection, which forms a great weld joint, ensures the welding strength and improves general mechanics of weld joint. The length of the water-passing hole is significantly reduced to perfect and simplify the enamel process. The tooling and method provided herein can be used in industrial production, and can improve the processing and assembly efficiency. The double-liner water heater can avoid water leakage and seepage after 300000 tests under a pulsating cyclic load of 10 atmospheres, allowing for high reliability.
In order to explain the technical solutions of the present disclosure more clearly, the accompanying drawings needed in the description of the embodiments of the present disclosure will be briefly described below. Obviously, presented in the accompany drawings are merely some embodiments of the present disclosure, which are not intended to limit the disclosure.
In the drawings: 1, hexagon socket set screw with cone point; 2, inner flange; 3, first welding seam (the seam between first welding assembly hole in upper liner and inner flange); 4, transition shaft; 5, tooling connecting plate; 6, outer flange; 7, second welding seam (the seam between second welding assembly hole in lower liner and outer flange); 8, upper liner; 9, lower liner; 10, first seal ring; 11, second seal ring; 12, steel strip; 13, end hole; 14, shaft head; B, fitting length between the shaft head of the transition shaft and the outer flange; A, fitting length between the end hole of the transition shaft and the inner flange; C, a center distance of water-passing holes; ϕD, the first welding assembly hole; and ϕE, the second welding assembly hole.
Described below are merely illustrative of the disclosure, and are not intended to limit the disclosure. Unless otherwise specified, terms used herein have the same meaning as commonly understood by those skilled in the art.
It should be noted that terms used herein are only illustrative, but not to limit the scope of the present invention. Unless specified, a singular form also includes a plural form. In addition, it should also be understood that when the terms “comprise” and/or “include” are used in the description, one or combinations of features, steps, operations, devices, components are contained.
For ease of description, terms “up”, “down”, “left” and “right” refer to orientational or positional relationship shown in the drawings, which are merely for better description of the present disclosure instead of indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, these terms should not be construed as a limitation to the present disclosure.
In order to clearly illustrate the objects and technical solutions of the present invention, the present disclosure will be described below in detail with reference to the embodiments and
Referring to
Specifically, centers of two end surfaces of the tooling connecting plate 5 are each provided with a screw hole along a length direction of the tooling connecting plate 5. The hexagon socket set screw with cone point 1 passes through a corresponding screw hole to fix the transition shaft 4 along a direction perpendicular to an axis of the transition shaft 4.
Referring to
The inner flange 2 of the double-liner electric water heater is shown in
The outer flange 6 of the double-liner electric water heater is shown in
In an embodiment, two flange assemblies between the upper liner and the lower liner adopt a flexible through connection, shown as
Provided is a method for flexible through connection of the double-liner water heater, which is performed by using the above-mentioned tooling. A gap between the upper liner and the lower liner is less than or equal to 7 mm. The method includes the following steps.
(S1) The inner flange 2 to be weld with the upper liner 8 is aligned with the outer flange 6 to be welded with the lower liner 9 by adjusting a position of the tooling shown in
(S2) The inner flange 2 is aligned with the first welding assembly hole ϕD of the upper liner 8 and welded, which forms the first welding seam 3 at an outer side of the upper liner 8. The outer flange 6 is aligned with the second welding assembly hole ϕE of the lower liner 9 and welded, which forms the second welding seam 7 at an outer side of the lower liner 9.
(S3) After the first welding seam 3 and the second welding seam 7 are cooled to room temperature, the tooling is removed. The upper liner 8 and the lower liner 9 are enameled. Then, the outer surface of each inner flange 2 is in flexible connection with the inner surface of each outer flange 6. During assembling the inner flange 2 and the outer flange 6, the first seal ring 10 is placed on the bottom surface of the inner flange 2, and the second seal ring 11 is placed on the cylindrical surface of the inner flange 2, which enhances the flexibility and reliability of the connection to prevent water leakage and seepage. The bottom surface of the inner flange 2 is provided with a recess structure to reduce the force-bearing area and increase a pressure, which improves the tightness to prevent water leakage and seepage.
(S4) The upper liner 8 and the lower liner 9 are firmly fitted together by using two steel strips 12. Each steel strip 12 provides a pre-tightening force of 350-500 kg, and the gap between the upper liner and the lower liner is less than or equal to 7 mm.
After the assembly, the double-liner water heater can avoid water leakage and water seepage after 300,000 tests under a pulsating cyclic load of 10 atmospheres.
Described above are merely illustrative of the disclosure, and are not intended to limit the disclosure. Although the disclosure has been illustrated and described in detail above, it should be understood that those skilled in the art could still make changes and modifications content to the embodiments content of the disclosure. Those changes, replacements and modifications content made by those skilled in the art based on the content disclosed herein without departing from the scope of the disclosure shall fall within the scope of the present disclosure defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310073932.8 | Jan 2023 | CN | national |
