Ceramic feed-through type armored electric heater

Abstract

The utility model relates to the technical field of electric heaters, in particular to a ceramic feed-through type armored electric heater, which comprises a metal sheath and an armored cable, the metal sheath is arranged at the upper part of the armored cable, a magnesium oxide insulating layer is arranged in the metal sheath, a ceramic feed-through structure is arranged at the lower part in the metal sheath, and the armored cable is arranged in the metal sheath. And a plurality of sections of conductive metal wires are embedded in the ceramic feed-through structure. The beneficial effects are that the heating area of the electric heater composed of the seamless alloy sheath, the compact magnesium oxide insulating material and the electrothermal alloy wire core can bear huge external impact force, the used ceramic feed-through structure enables the electric heater to have good sealing performance at the joint, and steam, gas and flame can be prevented from entering the electric heater. The heater is suitable for various temperature zones and scenes according to different heating power densities, can work in various gas environments, can resist the temperature of 600 DEG C, and can endure long-time cyclic heating.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heaters, in particular to a ceramic feedthrough type armored electric heater. Background Technique

[0002] An electric heater is a traditional electric heating element. It generally consists of a metal tube, a spiral resistance wire, magnesium oxide powder, etc. to form a heating area, and is connected to a circuit and an electrical connector via a terminal. This kind of heater has excellent overall performance and is applicable to a variety of temperature ranges and scenarios according to different heating power densities. However, there are problems such as poor sealing in the connection between the existing electric heater and the cable. After long-term cyclic heating use, it is easy to cause breakage, poor contact, or even short circuit, resulting in a sharp reduction in the service life of the heater.

[0003] Therefore, we propose an armored electric heater that uses a ceramic feedthrough structure for electrical connection. Content of the Utility Model

[0004] The purpose of the utility model is to provide a ceramic feedthrough type armored electric heater to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A ceramic feedthrough type armored electric heater, including a metal sheath and an armored cable. The metal sheath is arranged on the upper part of the armored cable. An alumina insulation layer is arranged inside the metal sheath. A ceramic feedthrough structure is arranged at the lower part inside the metal sheath. Multiple segments of conductive metal wires are embedded inside the ceramic feedthrough structure. Electric contact points one and two are respectively led out at both ends of the conductive metal wires.

[0006] Preferably, a resistance wire is fixedly installed in the middle inside the metal sheath.

[0007] Preferably, an electrical connector is electrically connected to the lower end of the armored cable.

[0008] Preferably, the electric contact point one is electrically connected to the resistance wire, and the electric contact point two is electrically connected to the armored cable.

[0009] Preferably, the ceramic feedthrough structures are all installed at the lower part inside the metal sheath by welding, and welding points one and two are respectively generated at the welding positions.

[0010] Preferably, a fixing block two is fixedly installed on the side of the conductive metal wire close to the armored cable, and a limiting groove is opened in the middle of the fixing block two. A fixing block one is fixedly installed on the side of the conductive metal wire close to the metal sheath. A limiting rod is fixedly installed in the middle of the side of the fixing block one close to the fixing block two, and an elastic protrusion is arranged on the lower part of the outer periphery of the limiting rod.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The heating area of the electric heater, which consists of a seamless alloy sheath, tightly compacted magnesium oxide insulation material, and an electrothermal alloy wire core, can withstand huge external impact forces. The ceramic feedthrough structure used provides good sealing at the connection, preventing steam, gas, and flame from entering the interior of the electric heater. It is applicable to a variety of temperature ranges and scenarios according to different heating power densities and can operate in a variety of gas environments. The heater can withstand temperatures up to 600°C and can endure long-term cyclic heating. Brief Description of the Drawings

[0013] Figure 1 It is a schematic plan view of a specific embodiment of the present utility model;

[0014] Figure 2 It is a schematic plan view of the ceramic feedthrough structure of the present utility model;

[0015] Figure 3 It is a schematic three-dimensional structure view of the present utility model;

[0016] Figure 4 It is a schematic view of the internal structure of the metal sheath of the present utility model;

[0017] Figure 5 It is a schematic view of a partial structure of the limiting rod of the present utility model.

[0018] In the figure: 1, resistance wire; 2, metal sheath; 3, magnesium oxide insulating layer; 4, ceramic feedthrough structure; 5, armored cable; 6, electrical connector; 21, solder joint one; 22, solder joint two; 23, electrical contact point one; 24, electrical contact point two; 7, fixing block one; 8, limiting rod; 9, elastic protrusion; 10, limiting groove; 11, fixing block two. Detailed Embodiment

[0019] In order to clearly and completely describe the purpose, technical solution of the present utility model, and make the advantages more clearly understood, the following further details the embodiments of the present utility model with reference to the drawings. It should be understood that the specific embodiments described herein are some embodiments of the present utility model, rather than all embodiments, and are only used to explain the embodiments of the present utility model, not to limit the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0020] Please refer to Figures 1 to 5, the utility model provides a technical solution: a ceramic feed-through armored electric heater, including a metal sheath 2 and an armored cable 5. The metal sheath 2 is arranged on the upper part of the armored cable 5. An magnesia insulation layer 3 is arranged inside the metal sheath 2. A ceramic feed-through structure 4 is arranged at the lower part inside the metal sheath 2. Multiple sections of conductive metal wires are embedded inside the ceramic feed-through structure 4. Two electrical contact points, namely an electrical contact point one 23 and an electrical contact point two 24, are respectively led out from both ends of the conductive metal wires. The metal sheath 2 is a continuous and seamless metal sheath 2, which is used for the sealing of the effective heating area, and has good mechanical properties, heat resistance and corrosion resistance. The magnesia insulation layer 3 is tightly compacted and filled inside the metal sheath 2, and at the same time tightly wraps the resistance wire 1, which is used for the insulation protection of the resistance wire. It jointly forms an effective heating area with the metal sheath 2 and the resistance wire 1. The armored cable 5 is a cloud bus bar wrapped by a metal corrugated pipe. The armored cable 5 itself can be bent within a certain range, and at the same time has excellent flame retardancy and a temperature resistance greater than 600 °C.

[0021] A resistance wire 1 is fixedly installed in the middle part inside the metal sheath 2. The lower end of the armored cable 5 is electrically connected to an electrical connector 6. The armored cable 5 can be connected to the electrical connector 6 through a common insulating cable. The electrical contact point one 23 is electrically connected to the resistance wire 1, and the electrical contact point two 24 is electrically connected to the armored cable 5. The ceramic feed-through structures 4 are all installed at the lower part inside the metal sheath 2 by welding, and welding points, namely a welding point one 21 and a welding point two 22, are respectively generated at the welding positions. The ceramic feed-through structure 4 is connected to the metal sheath 2 in a welding manner, so that the inside of the effective heating area is sealed, ensuring the sealing reliability of the heater. A fixing block two 11 is fixedly installed on one side of the conductive metal wire close to the armored cable 5, and a limiting groove 10 is opened in the middle of the fixing block two 11. A fixing block one 7 is fixedly installed on one side of the conductive metal wire close to the metal sheath 2. A limiting rod 8 is fixedly installed in the middle of one side of the fixing block one 7 close to the fixing block two 11, and an elastic protrusion 9 is arranged at the lower part of the outer periphery of the limiting rod 8. When the electrical contact point one 23 and the electrical contact point two 24 are connected, at this time, the limiting rod 8 cooperates with the elastic protrusion 9 and will be clamped in the limiting groove 10, making the direct connection between the electrical contact point one 23 and the electrical contact point two 24 more stable, avoiding the separation of the electrical contact point one 23 and the electrical contact point two 24 during actual use, which affects the normal use of the composition of the electric heater. At the same time, the elastic protrusion 9 can be made of ceramic rubber. The ceramic rubber can withstand a higher temperature, has good deformation ability, and has a certain insulating function, and will not affect its normal use.

[0022] In actual use, the resistance wire 1 uses a Ni-Cr electric heating alloy wire, generally including a diameter selection range of 0.1 - 1.5 mm, etc. The metal sheath 2 can use copper, copper-manganese alloy, stainless steel, inconel, etc. according to different use environments. The electric heater can operate continuously and normally at a high temperature of 250 °C - 1000 °C, and based on its sealing structure, it can meet the requirements of working in various environmental gases including air, nitrogen, argon, hydrogen, etc.

[0023] Although the above-described illustrative specific embodiments of the present application have been described to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all inventions created using the concept of the present application are within the scope of protection.

Claims

1. A ceramic feed-through armored electric heater, comprising a metal sheath (2) and an armored cable (5), wherein the metal sheath (2) is arranged on the upper part of the armored cable (5), characterized in that: A magnesium oxide insulating layer (3) is provided in the metal sheath (2), a ceramic feedthrough structure (4) is provided in the lower part of the metal sheath (2), a plurality of sections of conductive metal wire are embedded in the ceramic feedthrough structure (4), and electrical contact point 1 (23) and electrical contact point 2 (24) are respectively led out at both ends of the conductive metal wire.

2. A ceramic feed-through armored electric heater according to claim 1, characterized in that: A resistance wire (1) is fixedly installed in the middle of the metal sheath (2).

3. The ceramic feed-through armored electric heater according to claim 1, characterized in that: The lower end of the armored cable (5) is electrically connected to an electrical connector (6).

4. A ceramic feed-through armored electric heater according to claim 1, characterized in that: The electrical contact point one (23) is electrically connected to the resistance wire (1), and the electrical contact point two (24) is electrically connected to the armored cable (5).

5. The ceramic feed-through armored electric heater according to claim 1, characterized in that: The ceramic feedthrough structures (4) are installed in the lower part of the metal sheath (2) by welding, and welding points 1 (21) and 2 (22) are respectively generated at the welding points.

6. The ceramic feed-through armored electric heater according to claim 1, characterized in that: A second fixing block (11) is fixedly installed on the side of the conductive metal wire close to the armored cable (5), and a limiting groove (10) is provided in the middle of the second fixing block (11); a first fixing block (7) is fixedly installed on the side of the conductive metal wire close to the metal sheath (2); a limiting rod (8) is fixedly installed in the middle of the side of the first fixing block (7) close to the second fixing block (11), and an elastic protrusion (9) is provided on the lower part of the outer periphery of the limiting rod (8).

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