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Electric heating tube having automatically descaling function

A technology for automatic descaling and electric heating tubes, applied in the field of electric heating tubes, can solve the problems of inconvenient opening to check the scale condition, poor immediacy and accuracy, and affecting the thermal efficiency of electric heating tubes, etc.

Inactive Publication Date: 2009-03-25
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the scale is formed, the heat transfer efficiency of the metal electric heating tube is greatly reduced, which may cause the temperature of the electric heating tube shell to rise, resulting in the breaking of the electric heating wire in the electric heating tube, affecting the service life of the electric heating tube, and also affecting the thermal efficiency of the electric heating tube
[0003] At present, the solution to this kind of problem is to check and clean the scale of the electric heating tube, but usually the scale of the electric heating tube is difficult to detect, and the immediacy and accuracy of the detection are poor, so the normal cleaning and descaling of the electric heating tube cannot be guaranteed, especially for the relatively small High-power electric heating (boiling) water heaters and electric steam boilers have a large number of electric heating tubes and are inconvenient to open frequently to check the scale status, so it is difficult to remove scale

Method used

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  • Electric heating tube having automatically descaling function
  • Electric heating tube having automatically descaling function
  • Electric heating tube having automatically descaling function

Examples

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Embodiment 1

[0018] As shown in the figure, the electric heating tube with automatic descaling function is composed of electric heating wire 1, insulating material 2, metal casing sleeve 3, and bimetal cooling fins 4. The outer periphery of electric heating wire 1 is wrapped with insulating material 2, insulating material 2 is wrapped with a metal shell sleeve 3, and the metal shell sleeve 3 is fixedly connected with the bimetallic cooling fin 4.

[0019] The bimetal cooling fin 4 is formed by laminating two layers of alloys with different coefficients of thermal expansion. The materials of the active layer of the alloy material mainly include manganese-nickel-copper alloy, nickel-chromium-iron alloy, nickel-manganese-iron alloy and nickel, etc.; the material of the passive layer is mainly nickel-iron alloy. For example, the first material: the composition of the active layer is Mn75%, Ni15%, Cu10%, the rest is iron, and its thermal expansion coefficient is 27×10 within 20-100°C -6 / °C; w...

Embodiment 2

[0021] In the figure, the thickness and size of the bimetallic cooling fins 4 vary with the power of the electric heating tube. The arrangement of the bimetallic cooling fins 4 in the metal shell casing 3 also varies with the power of the electric heating tube. It can be 2-piece connection, 3-piece connection, 4-piece connection, 5-piece connection, 6-piece connection or 7-piece connection evenly distributed on the shell of the metal shell sleeve 3, up to 8-piece connection is advisable.

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Abstract

The invention relates to an electric heating tube with an automatic descaling function, which is composed of a heating wire, an insulating material, a metal casing sleeve and a double metal radiating fin. The periphery of the heating wire is coated with the insulating material, the periphery of the insulating material is coated with the metal casing sleeve, the metal casing sleeve and the double metal radiating fin are fixedly connected, and the double metal radiating fin is formed by laminating two layers of alloy with different thermal expansion coefficients. The radiating fin is pressed or welded on the metal casing of the electric heating tube to increase the heat reradiating surface area of the electric heating tube for strengthening the heat exchange of the electric heating tube. In order to prevent water deposit from being deposited on the radiating fin, the radiating fin adopts a double metal sheet. The deformation caused by the temperature change of the double metal radiating fin is utilized to prevent water deposit from being deposited on the surface of the double metal radiating fin.

Description

technical field [0001] The invention is an electric heating tube with an automatic descaling function, which belongs to the technical field of electric heating. It adopts cooling fins to expand the heat dissipation surface to strengthen the heat exchange of the electric heating tube and improve the thermal efficiency of the electric heating tube. The cooling fins have the function of automatic descaling. Therefore, the service life of the electric heating tube is greatly extended. Background technique [0002] The working principle of the electric heating tube is that the electric heating wire in the metal tube generates heat after being energized, and the heat is transferred to the heating object through the metal shell of the electric heating tube. When the electric heating tube is immersed in water to heat the water, a kind of calcium and magnesium ions, commonly known as scale, will be generated on the surface of the metal electric heating tube as the water temperature r...

Claims

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Application Information

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IPC IPC(8): H05B3/78H05B3/50
Inventor 刘平竹
Owner BEIJING JIAOTONG UNIV