Heater radiant tube capable of prolonging service life

Abstract

The utility model discloses a heater radiant tube capable of prolonging the service life, which comprises a plurality of resistance wires for electric heating and a plurality of ceramic support discs for fixing the resistance wires, metal pipe sleeves capable of increasing the local diameter of the resistance wire are arranged in contact connection areas of the resistance wire and the ceramic supporting disc, the metal pipe sleeves are connected with the resistance wire in a pressing mode, and the metal pipe sleeves are made of high-conductivity materials. The metal pipe sleeve enables the local resistance in the contact connection area of the resistance wire and the ceramic supporting disc to be reduced. The high-conductivity metal pipe sleeve is arranged in the contact area of the resistance wire and the ceramic supporting disc, so that the local resistance of the contact area of the resistance wire and the ceramic supporting disc is reduced due to diameter increase, and the effect of reducing the heating value of the contact area of the resistance wire and the ceramic supporting disc is achieved; and the risk that the resistance wire is fused at a corresponding position is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heaters such as industrial electric furnaces, heat treatment furnaces, diffusion furnaces, etc., in particular to a heater radiation tube capable of extending the service life. Background Art

[0002] An industrial electric furnace is a device that uses electrical energy to convert into thermal energy to heat materials. This furnace mainly includes a power supply system, a heating system, and a control system. The power supply system provides electrical energy, the heating system converts electrical energy into thermal energy, and the control system is responsible for managing the working status of the power supply and heating system. Industrial electric furnaces can be divided into many types according to different industrial needs and functional requirements, such as high-frequency induction furnaces, molten salt bath furnaces, arc furnaces, resistance furnaces, etc.

[0003] Heat treatment furnace refers to an electric furnace or fuel furnace used for heat treatment of furnace charge. Commonly used heat treatment furnaces include box-type resistance furnaces, pit-type resistance furnaces, etc. The working principle of box-type resistance furnaces and pit-type resistance furnaces is to use electric current to generate heat through the electric heating elements arranged in the furnace, and heat the parts through current and radiation.

[0004] Diffusion furnaces are used for diffusion, oxidation, annealing, alloying and sintering processes in industries such as large-scale integrated circuits, discrete devices, power electronics, optoelectronic devices and optical fibers. The main purpose of the diffusion process is to dope semiconductor wafers under high temperature conditions, that is, to diffuse elements such as phosphorus and boron into silicon wafers, thereby changing and controlling the type, concentration and distribution of impurities in the semiconductor in order to establish different electrical characteristic areas.

[0005] The heater is heated by installing a radiation tube. In the existing radiation tube installation method, since the resistance wire of the radiation tube is in contact with the ceramic disc, ceramic flange or ceramic frame in a relatively close space, which is not conducive to heat dissipation, a local high-temperature area will be formed. After the resistance wire of the radiation tube has been working for a long time, it is easy to melt in the contact area. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a heater radiation tube with a prolonged service life.

[0007] In order to solve the above technical problems, the technical solution of the utility model is: a heater radiation tube with extended service life, the radiation tube includes a plurality of resistance wires for electric heating and a plurality of ceramic support discs for fixing the resistance wires, and a metal tube sleeve that can increase the local diameter of the resistance wire is arranged in the contact connection area between the resistance wire and the ceramic support disc, the metal tube sleeve and the resistance wire are connected by compression, the metal tube sleeve is made of a highly conductive material, and the metal tube sleeve reduces the local resistance in the contact connection area between the resistance wire and the ceramic support disc.

[0008] Preferably, the metal sleeve is made of nickel-based alloy or iron-chromium alloy.

[0009] Preferably, the inner diameter of the metal sleeve is 0-1 mm larger than the outer diameter of the resistance wire.

[0010] Preferably, a plurality of support holes are formed on the ceramic support disc, and the plurality of support holes are formed equidistantly around the center of the ceramic support disc, and the plurality of resistance wires pass through corresponding support holes and are fixed on the ceramic support disc to form a squirrel cage structure.

[0011] The technical effects of the utility model are mainly reflected in the following aspects: by arranging a highly conductive metal tube sleeve in the contact area between the resistance wire and the ceramic support disc, the local resistance in the contact area between the resistance wire and the ceramic support disc is reduced due to the increase in diameter, thereby achieving the effect of reducing the heat generated in the contact area between the resistance wire and the ceramic support piece, and reducing the risk of the resistance wire fusing at the corresponding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the contact area between the heating wire and the ceramic disc in the prior art;

[0013] Figure 2 This is an overall schematic diagram of the radiation tube of the utility model;

[0014] Figure 3 This is a schematic diagram of the contact area structure of the resistance wire and the ceramic support disc of the utility model;

[0015] Figure 4 It is a partial cross-sectional schematic diagram of the utility model.

[0016] 1-radiation tube; 2-resistance wire; 3-ceramic support disc; 31-support hole; 4-metal tube sleeve. DETAILED DESCRIPTION

[0017] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Example

[0018] according to Figure 1-2As shown, a heater radiation tube with extended service life, the radiation tube 1 includes a plurality of resistance wires 2 for electric heating and a plurality of ceramic support discs 3 for fixing the resistance wires 2. Due to gravity reasons, when the heating wires of conventional products contact the ceramic discs, ceramic flanges, or ceramic frames, the heat at the contact position cannot be effectively radiated, which will cause local temperature rise. Existing products will add insulating materials on the surface of the resistance wire or local surface to achieve the purpose of protecting the radiation tube as a whole from high temperature damage, but ignore the risk that the local high temperature may cause the resistance wire to partially melt.

[0019] according to Figure 2-4 As shown, the present application is provided with a metal tube sleeve 4 which can increase the local diameter of the resistance wire in the contact connection area between the resistance wire 2 and the ceramic support disc 3. The metal tube sleeve 4 is connected to the resistance wire 2 by compression. The metal tube sleeve 4 is made of a highly conductive material, which can generally be a nickel-based alloy or an iron-chromium alloy, but is not limited to the above-mentioned conductive metal materials. The metal tube sleeve 4 reduces the local resistance in the contact connection area between the resistance wire 2 and the ceramic support disc 3, thereby achieving the effect of reducing the heat generated in the contact area between the resistance wire and the ceramic support disc, and reducing the risk of the resistance wire 2 fusing at the corresponding position.

[0020] In order to facilitate the use of a mold to press the metal sleeve 4 and the resistance wire 2 during installation and reduce the deformation of the metal sleeve 4, the inner diameter of the metal sleeve 4 is 0-1 mm larger than the outer diameter of the resistance wire 2.

[0021] The resistance wire 2 described in the present application adds a highly conductive metal tube sleeve 4 to achieve a structure that increases the local diameter, reduces resistance, and reduces heat generation. The structure can be applied to a variety of diffusion heat heater devices, especially squirrel cage heaters. A plurality of support holes 31 are formed on the ceramic support disc 3, and a plurality of the support holes 31 are formed equidistantly around the center of the ceramic support disc. A plurality of the support holes 31 can also form an inner circle or an outer circle. A plurality of the resistance wires 2 pass through corresponding support holes 31 and are fixed on the ceramic support disc 3 to form a squirrel cage structure. The resistance wire 2 of the squirrel cage structure has a large contact area with the ceramic support disc 3, and the risk of local high-temperature melting will also increase. Therefore, the application of this structure can significantly reduce the risk of the resistance wire 2 melting.

Claims

1. A heater radiant tube capable of extending service life, the radiant tube comprising a plurality of resistance wires for electric heating and a plurality of ceramic support discs for fixing the resistance wires, characterized in that: A metal tube sleeve that can increase the local diameter of the resistance wire is provided in the contact connection area between the resistance wire and the ceramic support disc. The metal tube sleeve is connected to the resistance wire by compression. The metal tube sleeve is made of a highly conductive material. The metal tube sleeve reduces the local resistance in the contact connection area between the resistance wire and the ceramic support disc.

2. A heater radiant tube capable of extending service life according to claim 1, characterized in that: The material of the metal pipe sleeve is nickel-based alloy or iron-chromium alloy.

3. The heater radiant tube capable of extending service life according to claim 1, characterized in that: The inner diameter of the metal tube sleeve is 0-1 mm larger than the outer diameter of the resistance wire.

4. The heater radiant tube capable of extending service life according to claim 1, characterized in that: A plurality of support holes are formed on the ceramic support disc, and the plurality of support holes are formed equidistantly around the center of the ceramic support disc. A plurality of resistance wires pass through corresponding support holes and are fixed on the ceramic support disc to form a squirrel cage structure.

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