Multi-tube electric heater using porous bracket with flanging structure

Abstract

The utility model relates to electric heating equipment, and aims to provide a multi-tube electric heater using a porous bracket with a flanging structure. The electric heater comprises a plurality of electric heating pipes which are arranged in parallel and at intervals, and the wiring end of each electric heating pipe penetrates through a flange and is fastened and installed. At least one support with a plurality of holes is further arranged on the electric heating pipes, and the electric heating pipes penetrate through the holes in the support to achieve auxiliary supporting and reinforcing. The body of the support is of an integrated sheet structure, and the edge of each opening of the body is provided with a flanging structure perpendicular to the body of the support. The flanging structure is tightly embedded in the electric heating pipe in a riveting mode, and the outer side edge of the flanging structure is fixedly connected with the surface of the electric heating pipe in a brazing mode. According to the installation mode, potential safety hazards caused by a crevice corrosion principle can be effectively avoided, and the service life of a product is prolonged; the double fixing modes of riveting and brazing can prevent the support from scratching an oxide layer on the surface of the electric heating pipe in the using process, and noise is completely eradicated.

Description

Technical Field

[0001] The utility model relates to electric heating equipment, in particular to a multi-tube electric heater using a porous bracket with a flanging structure. Background Art

[0002] An electric heater with multiple heating tubes is a widely used heating device, which is common in liquid heating scenarios, such as water heaters, steaming and cooking equipment, coffee machines and other electrical appliances. Figure 1 As shown, in order to reduce the size of the equipment and improve the heating efficiency, this type of heater usually arranges multiple U-shaped heating tubes in a circumferentially spaced bundle manner, fixes one end with a flange, and uses a bracket in the middle of the heating tube for auxiliary support and reinforcement, and maintains a distance between the heating tubes.

[0003] Based on the positional relationship of each heating tube, this type of bracket usually uses a round metal sheet for punching. During installation, the terminal of each U-shaped heating tube is first passed through the through hole on the bracket, and then through the flange for fixed installation. Therefore, in order to facilitate punching during installation, the size of the through hole on the bracket will be slightly larger than the outer diameter of the heating tube, which causes the following technical problems:

[0004] (1) Due to the unique liquid immersion method of the electric heater, when there is a gap between the bracket through hole and the heater tube wall, after long-term use, the heating tube shell or metal bracket will show corrosion pits or deep holes of varying depths due to the principle of crevice corrosion, posing a hidden danger to the long-term safe operation of the equipment.

[0005] (2) During the use of the electric heater, the water flow inside the heating device will directly impact the electric heating tube and the bracket. The relatively unstable installation relationship causes the bracket to easily move relative to the heating tube, which will not only generate noise but also cause scratches on the outer wall of the heating tube. This will damage the oxide layer on the surface of the tube, affect its corrosion resistance, and further shorten the service life of the electric heater. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a multi-tube electric heater using a porous bracket with a flanging structure.

[0007] In order to solve the above technical problems, the solution adopted by the utility model is:

[0008] Provided is a multi-tube electric heater using a porous bracket with a flange structure, the electric heater comprising a plurality of parallel and alternately arranged electric heating tubes, the wiring ends of each electric heating tube passing through a flange and being fastened and installed; at least one bracket with a plurality of openings is also provided on the electric heating tube, each electric heating tube passing through the openings on the bracket to achieve auxiliary support and reinforcement;

[0009] The body of the bracket is an integrated sheet structure, and the edge of each opening thereof has a flange structure perpendicular to the bracket body; the flange structure is tightly embedded in the electric heating tube by riveting, and its outer edge is fixedly connected to the surface of the electric heating tube by brazing.

[0010] As an improved solution, the bracket is arc-shaped, and the center of each opening on the bracket is located on a circle coaxial with the flange.

[0011] As an improved solution, the flange structure is a complete annular protrusion, or a plurality of arc-shaped protrusions arranged at intervals in the annular direction.

[0012] As an improved solution, the electric heating tube is a U-shaped heating tube, and the electric heating tubes are arranged in a staggered manner so that the openings on a single bracket are respectively embedded in different heating tubes.

[0013] As an improved solution, there are at least two brackets, which are arranged at intervals and staggered on opposite sides of the electric heating tube.

[0014] As an improved solution, the edge of the other side of the bracket opening opposite to the flange structure is also fixedly connected to the surface of the electric heating tube by brazing.

[0015] As an improved solution, the bracket is an integrated structure made of metal sheets by stamping.

[0016] As an improved solution, the flange structures of the openings on the same bracket are all located on the same side surface of the bracket.

[0017] As an improved solution, the electric heating tubes are arranged alternately and pass through the through holes on the flange, the through holes are equally spaced and their centers are located on a circle coaxial with the flange.

[0018] As an improved solution, the electric heating tubes are three U-shaped electric heating tubes; the bracket is arc-shaped, with an opening in the middle and an opening at each end; a bracket is alternately arranged in the middle of the electric heating tube and near the non-wiring end, and the two sections of the same U-shaped electric heating tube are respectively embedded in different brackets.

[0019] Compared with the prior art, the technical effects of the utility model are:

[0020] 1. The utility model adopts a porous bracket with a flange structure. After the electric heating tube passes through the opening on the bracket, the flange structure is fastened to the outside of the heating tube by riveting, and then further installation reinforcement and gap filling are achieved by brazing. This installation method can effectively avoid the safety hazards caused by the crevice corrosion principle in the prior art and extend the service life of the product.

[0021] 2. Due to the dual fixing method of riveting and brazing, the relative movement between the bracket and the electric heating tube caused by water flow impact during use can be avoided, the oxide layer on the surface of the electric heating tube can be avoided from being scratched, and noise can be prevented.

[0022] 3. The bracket in the utility model is manufactured by a mature stamping process, and the processing is simple; the mature riveting and brazing process is used for fixed connection during the installation process, and the operation is convenient; therefore, the entire manufacturing and installation process will not significantly increase the cost.

[0023] 4. The bracket in the utility model can be arc-shaped and used to connect different U-shaped electric heating tubes arranged in a staggered layout; therefore, in the electric heater products of conventional size, only two relatively staggered arc-shaped brackets are needed to achieve stable installation. Compared with the solution of using two circular brackets in traditional heaters, the bracket in the utility model can reduce the use of metal sheets by more than 60%, thereby greatly reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a multi-tube electric heater and a support structure in the prior art.

[0025] Figure 2 It is a porous bracket with a flanging structure in the utility model.

[0026] Figure 3 It is a structural diagram of the electric heater and the bracket in the utility model.

[0027] Figure 4 It is a schematic diagram of the installation effect of the electric heater and the bracket in the utility model.

[0028] Figure 5 It is a schematic diagram of the installation effect of the electric heater and the bracket in the utility model.

[0029] The reference numerals in the figure are: 1 bracket, 2 electric heating tube, 3 flange, 4 temperature measuring tube. DETAILED DESCRIPTION

[0030] The specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings.

[0031] like Figure 2-5 As shown, the multi-tube electric heater with a porous bracket with a flange structure in the utility model comprises a plurality of parallel and alternately arranged electric heating tubes 2, each of which passes through a through hole on a flange 3 with a terminal and is fastened and installed. The through holes of the flange 3 are arranged at equal intervals, and the center of the through hole is located on a circle coaxial with the flange 3. The temperature measuring tube 4 is fixedly installed at the axial center of the flange 3.

[0032] Two brackets 1 with openings are also embedded on the electric heating tube 2, and each electric heating tube passes through the openings on the bracket 1 to achieve auxiliary support and reinforcement. Specifically, the body of the bracket 1 is an integrated sheet structure, and the edge of each opening thereof has a flange structure perpendicular to the bracket body. The bracket 1 is made of metal sheet (such as aluminum alloy sheet or stainless steel sheet) by stamping, and the flange structures of each opening on the same bracket 1 are all located on the same side surface (or on different sides). The flange structure is preferably a complete annular protrusion, or it can be a plurality of arc-shaped protrusions arranged at intervals in the annular direction. Optionally, the bracket 1 is arc-shaped, and the center of each opening is located on a circle coaxial with the flange 3.

[0033] During installation, first pass the wiring terminals of each electric heating tube 2 through the openings on the bracket 1, and tightly embed the flange structure on the electric heating tube 2 by riveting, and fix its outer edge to the surface of the electric heating tube 2 by brazing. The other side edge of the opening of the bracket 1 opposite to the flange structure is also fixedly connected to the surface of the electric heating tube 2 by brazing (that is, brazing is performed on both sides of the bracket 1). Through this operation, the gaps existing after riveting can be densely filled, and a reinforced connection can be further achieved. After completing the installation of the bracket 1, install the temperature measuring tube 4 and the flange 3 according to normal operations.

[0034] The electric heating tubes 2 used in general are U-shaped heating tubes, and the electric heating tubes are preferably arranged in a staggered manner so that the openings on a single bracket 1 are respectively embedded in different electric heating tubes 2. Then, two brackets 1 are arranged at intervals and staggered on opposite sides of the electric heating tube 2, so that only two brackets with relatively smaller areas are needed to achieve stable installation of all the electric heating tubes 2.

[0035] like Figure 3-5 As shown in the figure, there are three electric heating tubes 2, all of which are U-shaped structures; the bracket 1 is arc-shaped, with an opening in the middle and an opening at each end; a bracket 1 is alternately arranged in the middle of the electric heating tube 2 and near the non-wiring end, and the two sections of the same U-shaped electric heating tube 2 are respectively embedded in different brackets 1.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-tube electric heater using a porous bracket with a flange structure, the electric heater comprises a plurality of parallel and alternately arranged electric heating tubes, the terminal of each electric heating tube passes through a flange and is fastened and installed; at least one bracket with a plurality of openings is also provided on the electric heating tube, and each electric heating tube passes through the openings on the bracket to achieve auxiliary support and reinforcement; characterized in that, The body of the bracket is an integrated sheet structure, and the edge of each opening thereof has a flange structure perpendicular to the bracket body; the flange structure is tightly embedded in the electric heating tube by riveting, and its outer edge is fixedly connected to the surface of the electric heating tube by brazing.

2. The multi-tube electric heater using a porous support with a flanging structure according to claim 1, characterized in that: The bracket is arc-shaped, and the center of each opening on the bracket is located on a circle coaxial with the flange.

3. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The flange structure is a complete annular protrusion, or a plurality of arc-shaped protrusions arranged at intervals in the annular direction.

4. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The electric heating tubes are U-shaped heating tubes, and the electric heating tubes are arranged in a staggered manner so that the openings on a single bracket are respectively embedded in different heating tubes.

5. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: There are at least two brackets, which are arranged at intervals and staggered on opposite sides of the electric heating tube.

6. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The other side edge of the bracket opening opposite to the flange structure is also fixedly connected to the surface of the electric heating tube by brazing.

7. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The bracket is an integrated structure made of metal sheets by stamping.

8. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The flange structures of the openings on the same bracket are all located on the same side surface of the bracket.

9. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The electric heating tubes are arranged alternately and pass through the through holes on the flange. The through holes are equally spaced and their centers are located on a circle coaxial with the flange.

10. The multi-tube electric heater using a porous support with a flanged structure according to claim 1, characterized in that: The electric heating tubes are three U-shaped electric heating tubes; the brackets are arc-shaped, with an opening in the middle and an opening at each end; a bracket is alternately arranged in the middle of the electric heating tube and near the non-wiring end, and the two sections of the same U-shaped electric heating tube are respectively embedded in different brackets.

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