Electric heating device for enhancing heat conduction in sodium storage tank

Abstract

The utility model discloses an electric heating device for enhancing heat conduction in a sodium storage tank, relates to the technical field of heat conduction of electric heating devices, and is used for solving the problem that the total power of the existing electric heating device cannot reach the designed total power. The electric heating device comprises a junction box assembly, a protective sleeve, a flange connecting piece, a heating element, a supporting piece and a heat conducting tile. The protective sleeve is connected with the junction box assembly, the heating elements are connected into the protective sleeve through the flange connecting piece in a flange connection mode, the heating elements are evenly arranged in the protective sleeve in a regular triangle mode, and a plurality of supporting pieces are arranged on the heating elements. The heating section part of the heating element is completely coated with heat conducting tiles, the heat conducting tiles are connected with each other through bolt holes in the supporting piece, and a gap between the heating section part of the heating element coated with the heat conducting tiles and the protective sleeve is filled with heat conducting copper powder.

Description

Technical Field

[0001] The utility model relates to the technical field of heat conduction of electric heating devices, in particular to an electric heating device with enhanced heat conduction in a sodium storage tank. Background Art

[0002] A nuclear power unit utilizes a sodium-sodium-water three-circuit design. The heat carrier in the primary and secondary systems is sodium metal, and a sodium purification system is installed to remove impurities from the sodium. During sodium purification in the primary circuit, the sodium storage tanks require electrical heating to compensate for system heat loss. The design power of a single electric heating rod is 14.17kW. However, in actual field use, when the power of a single heating rod reached 3.8kW, the heating tubes overheated and shut off due to a temperature exceeding 550°C, causing the total power of the electric heating system to fall below the design power. Utility Model Content

[0003] The utility model aims to provide an electric heating device with enhanced heat conduction in a sodium storage tank, so as to solve the problem that the total power of the existing electric heating device cannot reach the designed total power.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an electric heating device with enhanced heat conduction in a sodium storage tank, wherein the electric heating device includes: a junction box assembly, a protective sleeve, a flange connector, a heating element, a support member, and a thermally conductive tile; the protective sleeve is connected to the junction box assembly, the heating element is connected to the protective sleeve in a flange connection manner through the flange connector, the heating elements are evenly arranged in an equilateral triangle in the protective sleeve, and a plurality of support members are provided on the heating element; the heating section of the heating element is completely covered with thermally conductive tiles, the thermally conductive tiles are connected to each other through bolt holes on the support member, and the gap between the heating section of the heating element covered with the thermally conductive tile and the protective sleeve is filled with thermally conductive copper powder.

[0005] In the above-mentioned electric heating device for enhancing heat conduction in a sodium storage tank, the heat-conducting tiles are made of copper.

[0006] In the above-mentioned electric heating device for enhancing heat conduction in a sodium storage tank, the heating element is a U-shaped electric heating tube.

[0007] The above-mentioned electric heating device for enhancing heat conduction in a sodium storage tank, wherein the thermal conductive tiles are divided into straight pipe section type I, type II and bottom U-shaped part type III, the bottom U-shaped part type III of the thermal conductive tile is covered on the bottom of the heating section of the heating element 4, the straight pipe section type II is covered above the bottom U-shaped part type III, and the straight pipe section type I is covered above the straight pipe section type II.

[0008] In the above-mentioned electric heating device for enhancing heat conduction in a sodium storage tank, the support member is an annular disc, and circular holes arranged in an equilateral triangle are provided on the annular region of the support member for the passage of the heating element.

[0009] In the above-mentioned electric heating device for enhancing heat conduction in a sodium storage tank, the multiple support members arranged on the inner side of the heating element are parallel to each other.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the electric heating device for enhancing heat conduction in a sodium storage tank provided by the present invention effectively reduces the gap between the heating element and the protective sleeve by modifying the arrangement of the electric heating element and adding heat-conducting tiles, thereby greatly improving the heat transfer power of the electric heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure shows a schematic structural diagram of an electric heating device for enhancing heat conduction in a sodium storage tank according to the present invention;

[0012] Figure 2 The figure shows a schematic structural diagram of a support member of an electric heating device for enhancing heat conduction in a sodium storage tank according to the present invention;

[0013] Figure 3 The figure shows a schematic structural diagram of the heat-conducting tile of the electric heating device for enhancing heat conduction in a sodium storage tank according to the present invention before installation;

[0014] Figure 4 The figure shows a schematic structural diagram of the heat-conducting tiles of the electric heating device for enhancing heat conduction in a sodium storage tank described in the present invention after installation.

[0015] Explanation of the numbers in the accompanying drawings: 1. Junction box assembly; 2. Protective sleeve; 3. Flange connector; 4. Heating element; 5. Support member; 6. Thermal tile. DETAILED DESCRIPTION

[0016] In order to solve the problem of insufficient heating power of existing electric heating devices, the utility model provides an electric heating device with enhanced heat conduction in a sodium storage tank. Figures 1 to 4 As shown, the electric heating device includes a junction box assembly 1, a protective sleeve 2, a flange connector 3, a heating element 4, a support 5 and a thermally conductive tile 6; the junction box assembly 1 is arranged in a sodium storage tank, the protective sleeve 2 is connected to the junction box assembly 1, and a flange connector 3 is provided on the protective sleeve, and the heating element 4 is connected to the protective sleeve 2 through the flange connector 3.

[0017] The heating element 4 is a U-shaped electric heating tube, evenly arranged in an equilateral triangle within the protective sleeve. This arrangement reduces the gap between the heating element and the protective sleeve within the electric heating device. Multiple parallel support members 5 are also positioned within the heating element 4, through which the heating element 4 passes, perpendicular to the support members 5. The support members 5 are annular discs with circular holes arranged in an equilateral triangle within the annular region of the support members 5 for the heating elements 4 to pass through. The support members 5 support and connect the heating element 4 via snap fasteners.

[0018] Figure 3 、 Figure 4 The figure shows the structure before and after the installation of the thermally conductive tile 6. After the thermally conductive tile 6 is attached to the heating end of the heating element 4, the heating element 4 is covered by bending the two sides of the thermally conductive tile 6 to complete the installation of the thermally conductive tile 6. Covering the heating end of the heating element 4 with the thermally conductive tile 6 can enhance its thermal conductivity. The thermally conductive tile 6 is preferably made of copper and is divided into a straight pipe section (Type I copper piece), a Type II copper piece, and a bottom U-shaped section (Type III copper piece). From top to bottom, the thermally conductive tiles 6 are sequentially covered with the heating end of the heating element 4. The thermally conductive tiles 6 are connected by support members 5, which are provided with bolt holes. After adjusting the position of the thermally conductive tiles 6, the support members 5 are tightened with connecting bolts.

[0019] The heating element 4 equipped with the thermally conductive tile 6 is installed in the protective sleeve 2 through the flange connector 3. The gap between the thermally conductive tile 6 and the protective sleeve 2 is evenly filled with thermally conductive copper powder. The thermally conductive copper powder is preferably pure copper powder. The advantage of doing so is that the heat transfer power of the electric heating rod can be significantly improved.

[0020] It should be noted that the combination of the various technical features in the embodiments of the present invention is not limited to the combination described in the embodiments of the present invention or the combination described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way unless there is a contradiction between them.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric heating device for enhancing heat conduction in a sodium storage tank, characterized in that: The electric heating device comprises: a junction box assembly (1), a protective sleeve (2), a flange connector (3), a heating element (4), a support member (5), and a heat-conducting tile (6); the protective sleeve (2) is connected to the junction box assembly (1); the heating element (4) is connected to the protective sleeve (2) in a flange-connected manner via the flange connector (3); the heating elements (4) are evenly arranged in an equilateral triangle in the protective sleeve (2); a plurality of the support members (5) are provided on the heating element (4); the heating section of the heating element (4) is entirely covered with a heat-conducting tile (6); the heat-conducting tiles (6) are connected to each other via bolt holes on the support member (5); and the gap between the heating section of the heating element (4) covered with the heat-conducting tile (6) and the protective sleeve (2) is filled with heat-conducting copper powder.

2. The electric heating device for enhancing heat conduction in a sodium storage tank according to claim 1, characterized in that: The heat-conducting tile (6) is made of copper.

3. The electric heating device for enhancing heat conduction in a sodium storage tank according to claim 1, characterized in that: The heating element (4) is a U-shaped electric heating tube.

4. The electric heating device for enhancing heat conduction in a sodium storage tank according to claim 1, characterized in that: The heat-conducting tile (6) is divided into a straight pipe section part type I, a type II and a bottom U-shaped part type III. The bottom U-shaped part type III of the heat-conducting tile (6) is coated on the bottom of the heating section of the heating element (4), the straight pipe section part type II is coated on the top of the bottom U-shaped part type III, and the straight pipe section part type I is coated on the top of the straight pipe section part type II.

5. The electric heating device for enhancing heat conduction in a sodium storage tank according to claim 1, characterized in that: The support member (5) is an annular disc, and circular holes arranged in an equilateral triangle for the heating element (4) to pass through are provided on the annular region of the support member (5).

6. The electric heating device for enhancing heat conduction in a sodium storage tank according to claim 1, characterized in that: The plurality of support members (5) arranged inside the heating element (4) are parallel to each other.

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