Extraction electrode structure of electric heating tube

Abstract

The utility model relates to the related technical field of electric heating tubes, in particular to an extraction electrode structure of an electric heating tube, which comprises a tube fitting, extraction electrodes are arranged on inner rings of two ends of the tube fitting, and each extraction electrode consists of a spring wire, a pin, a bridging sheet and a connecting rod. The spring wire is of a spiral spring structure, the periphery of the spring wire is in close contact with the inner wall of the pipe fitting, the head end and the tail end of the spring wire extend towards the outside of the pipe fitting to form pins, and the ends of the pins are connected with connecting rods through bridging pieces. The pipe fitting is a quartz tube with a coating on the inner wall, and the coating is a graphene conductive heating coating. According to the extraction electrode structure of the electric heating tube, through a double-pin structure, the maximum power borne by double pins is one time that of a single-pin structure in a high-power use scene and under the condition that the elasticity of an electrode is kept unchanged, the service life of the pins is effectively prolonged, two ends can be effectively sealed through hot melting packaging of the two ends of the tube, and the service life of the tube is prolonged. And meanwhile, the position of the bridging sheet is fixed.

Description

Technical Field

[0001] This utility model relates to the technical field of electric heating tubes, and in particular to a lead-out electrode structure for an electric heating tube. Background Technology

[0002] A tubular heating element (or heating tube for short) is an electrical component that converts electrical energy into heat energy. A spiral heating wire is evenly distributed along the central axis inside the tube. Common heating tubes include finned heating tubes, Teflon heating tubes, quartz heating tubes, etc. The basic principle is that the spring wire generates heat when energized. Heat is generated by connecting the positive and negative electrodes. The electrode leads need to be led out to the terminal for energization. To improve the effectiveness of the electrodes, a lead-out electrode structure is required for the heating tube.

[0003] The lead electrode structure of existing electric heating tubes generally adopts a single-pin structure. In high-power applications, if the electrode maintains constant elasticity (i.e., the electrode does not change the wire diameter), the pin will become red-hot and melt. Utility Model Content

[0004] The purpose of this invention is to provide a lead electrode structure for an electric heating tube, in order to solve the problem mentioned in the background art that the lead electrode structure of the existing electric heating tube generally adopts a single-pin structure. In high-power applications, when the electrode maintains constant elasticity (i.e., the electrode does not change the wire diameter), the pin will burn red and melt.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lead-out electrode structure for an electric heating tube, comprising a tube fitting, with lead-out electrodes arranged on the inner rings at both ends of the tube fitting. The lead-out electrodes are composed of a spring wire, leads, bridging plates, and connecting rods. The spring wire is a helical spring structure, and the outer circumference of the spring wire is in close contact with the inner wall of the tube fitting. The first and last ends of the spring wire extend outwards from the tube fitting, and the ends of the leads are connected to the connecting rods via bridging plates.

[0006] The tube is a quartz tube with a coating on its inner wall, and the coating is a graphene conductive and heating coating, used to connect the lead-out electrodes at both ends of the tube in series.

[0007] Preferably, the bridging piece is heat-sealed at both ends of the tube, and all tubes are sealed by heat-sealing.

[0008] Preferably, the spring wire, pin, bridging plate, and connecting rod are all made of tungsten or molybdenum.

[0009] Preferably, the end of the spring wire is tapered, and the gap between the spring wires is set at equal intervals or gradually decreases from the beginning to the end.

[0010] Preferably, the pins, the bridging piece, and the connecting rod are welded together.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The lead electrode structure of this electric heating tube, through the double-pin structure, allows the maximum power that the double pins can withstand under high-power application scenarios, while maintaining the same elasticity of the electrodes, effectively increasing the service life of the pins. Secondly, the heat-sealing of both ends of the tube can effectively seal both ends and fix the position of the bridging piece. Furthermore, the electrode structure with spring wire can be directly inserted into the tube and make close contact with the coating to form a passage, thus fixing the electrode and the tube relatively, replacing welding. In addition, when the tube is heated, the quartz tube expands and contracts with temperature, while the spring wire is made of molybdenum wire, which is elastic, so it will also contract or expand accordingly, ensuring continuous contact with the coating. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the external structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the spring wire structure of this utility model.

[0014] In the diagram: 1. Pipe fitting; 2. Spring wire; 3. Pin; 4. Bridging plate; 5. Connecting rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-2 This utility model provides a technical solution: a lead-out electrode structure for an electric heating tube, including a tube 1. Lead-out electrodes are arranged on the inner rings of both ends of the tube 1. Each lead-out electrode consists of a spring wire 2, pins 3, a bridging plate 4, and a connecting rod 5. The spring wire 2 is a helical spring structure, and its outer circumference is in close contact with the inner wall of the tube 1. Pins 3 extend from both the beginning and end of the spring wire 2 outwards from the tube 1. The ends of the pins 3 are connected to the connecting rod 5 via the bridging plate 4. Optionally, the pins 3, the bridging plate 4, and the connecting rod 5 are fixedly connected by welding. The design of the spring wire 2 as a helical spring structure with its outer circumference in close contact with the inner wall of the tube 1 facilitates the relative positioning and fixation of the electrode and the tube. Furthermore, the spring wire 2 acts as an electrical conductor, contacting the inner wall of the tube 2 for electrical connection.

[0017] The tube 1 is a quartz tube with a coating on its inner wall, and the coating is a graphene conductive and heating coating, used to connect the lead electrodes at both ends of the tube 1 in series. Of course, in some other embodiments, the coating can also be a conductive coating of other materials.

[0018] Quartz tube fittings 1 have extremely high hardness, are fireproof and heat resistant, and have good electrical insulation properties. The resistance value of quartz tube is equivalent to 10,000 times that of ordinary glass, making it an excellent electrical insulation material. It maintains good electrical performance even at high temperatures. At the same time, when combined with a graphene conductive heating coating, it can be used in environments not exceeding 1200 degrees Celsius.

[0019] Furthermore, the bridging piece 4 is heat-sealed at both ends of the pipe fitting 1, and both ends of the pipe fitting 1 are sealed by heat-sealing. With the setting of the bridging piece 4, the bridging piece 4 ensures the airtightness of the pipe fitting 1 after sealing.

[0020] Furthermore, the spring wire 2, pin 3, bridging plate 4, and connecting rod 5 are all made of tungsten or molybdenum. Through the arrangement of the spring wire 2, pin 3, bridging plate 4, and connecting rod 5, tungsten and molybdenum have good thermal conductivity, electrical conductivity, low coefficient of thermal expansion, high temperature strength, low vapor pressure, and wear resistance.

[0021] Furthermore, the end of the spring wire 2 is tapered, and the gap between the spring wire 2 is set at equal intervals or gradually decreases from the beginning to the end. The specific design can be made according to actual needs. By designing the end of the spring wire 2 as tapered, it can be easily inserted into the pipe fitting 1.

[0022] Working principle: First, both ends of the spiral structure of the spring wire 2 extend out as pins 3. The two sets of pins 3 are welded to the bridging plate 4. At the same time, the connecting rod 5 is welded to one side of the bridging plate 4 to form a complete electrode structure. Then, the end of the spring wire 2 is embedded into the tube 1. The end of the spring wire 2 is a tapered structure. When embedded, the end first enters the tube 1, and then the head end is squeezed against the tube 1. While fixing, the spring wire 2 is tightened. After the electrode position is fixed, the two ends of the tube 1 are heat-melted and flattened to form a rectangular structure. It is then sealed from the position of the bridging plate 4. The connecting rod 5 extends out from both ends of the tube 1 and connects to the external wires.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lead-out electrode structure for an electric heating tube, comprising a tube fitting (1), characterized in that: The inner rings of both ends of the pipe fitting (1) are provided with lead-out electrodes. The lead-out electrodes are composed of spring wire (2), pins (3), bridging plates (4) and connecting rods (5). The spring wire (2) is a helical spring structure and the outer periphery of the spring wire (2) is in close contact with the inner wall of the pipe fitting (1). The first and last ends of the spring wire (2) extend outwards to the outside of the pipe fitting (1) with pins (3). The end of the pins (3) is connected to the connecting rods (5) via the bridging plates (4). The tube (1) is a quartz tube with a coating on its inner wall, and the coating is a graphene conductive heating coating, which is used to connect the lead-out electrodes at both ends of the tube (1) in series.

2. The lead-out electrode structure of a heating element according to claim 1, characterized in that: The bridging piece (4) is heat-sealed at both ends of the pipe (1), and both ends of the pipe (1) are sealed by heat-sealing.

3. The lead-out electrode structure of a heating element according to claim 1, characterized in that: The spring wire (2), pin (3), bridging plate (4), and connecting rod (5) are all made of tungsten or molybdenum.

4. The lead-out electrode structure of a heating element according to claim 1, characterized in that: The end of the spring wire (2) is tapered, and the gaps between the spring wires (2) are set at equal intervals or gradually decrease from the beginning to the end.

5. The lead-out electrode structure of a heating element according to claim 1, characterized in that: The pin (3), the bridging piece (4), and the connecting rod (5) are welded together.

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