Pipeline type high-temperature electric heater, manufacturing method and using method

Abstract

The invention discloses a pipeline type high-temperature electric heater, a manufacturing method and a using method, the pipeline type high-temperature electric heater comprises a pipeline type shell, a double-layer sealing sleeve assembly is arranged in the pipeline type shell, one end of the double-layer sealing sleeve assembly is limited and supported through a limiting support, and a resistance heating wire is arranged in the double-layer sealing sleeve assembly; the two ends of the resistance heating wire are led out of the upper side and the lower side of the two ends of the pipeline type shell respectively and are connected with the conducting rod connecting end through the high-temperature insulation sealing kit, and heating channels are formed between the pipeline type shell and the double-layer sealing sleeve assembly and on the inner side of the double-layer sealing sleeve assembly. A pipeline type electric heater structure is adopted, a flow channel between the pipeline type shell and the double-layer sealing sleeve assembly is small in section size, high in flow speed and uniform in temperature field, the electric heater is high in temperature rise rate, the electric heater has excellent thermal-state insulation resistance performance in a high-temperature state, equipment short-circuit damage caused by contact of impurities and resistance wires is avoided, and the service life of the electric heater is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric heaters, and particularly relates to a pipeline type high-temperature electric heater, a manufacturing method and a use method thereof. Background Art

[0002] An electric heater is an electric heating device used for heating, keeping warm and heating a flowing gaseous medium. When the heating medium passes through the heating cavity of the electric heater under the action of pressure, it uniformly takes away the huge heat generated during the operation of the electric heating element by using the principle of fluid thermodynamics, so that the temperature of the heated medium reaches the process requirements of the user.

[0003] Currently, in the field of high-temperature and high-efficiency gas heating, extremely high temperature rise requirements are put forward for heating equipment and media. The electric heater needs to complete heating up and cooling down in a short time to meet the requirements of sudden working conditions. At the same time, the gas components at many on-site working conditions are impure, containing reducing impurities such as CO and H2. Reduction reactions are extremely likely to occur at high temperatures, resulting in carbon deposition (carbon has good electrical conductivity and will damage the equipment). Even in some working conditions, the medium contains particulate impurities such as silicon powder, which are extremely likely to adsorb inside the equipment (causing equipment congestion and damage). Therefore, we propose a pipeline type high-temperature electric heater, a manufacturing method and a use method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a pipeline type high-temperature electric heater, a manufacturing method and a use method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A pipeline type high-temperature electric heater, comprising: A pipeline type outer shell; A double-layer sealed sleeve assembly, the double-layer sealed sleeve assembly is arranged in the pipeline type outer shell through a support block, and one end of the double-layer sealed sleeve assembly is limited and supported by a limit bracket; A resistance heating wire, the resistance heating wire is arranged in the double-layer sealed sleeve assembly, and both ends of the resistance heating wire are respectively led out from the upper and lower sides of both ends of the pipeline type outer shell and connected to the conductive rod connection end through a high-temperature insulation sealing kit; A heating channel is formed between the pipeline type outer shell and the double-layer sealed sleeve assembly and inside the double-layer sealed sleeve assembly.

[0006] Preferably, connection flanges are arranged at both ends of the pipeline type outer shell.

[0007] Preferably, the inner surface of the pipeline type outer shell is formed into a smooth surface through polishing treatment.

[0008] Preferably, the double-layer sealed sleeve assembly includes an outer protective sleeve, an inner protective sleeve and a sealing end cap ring; The inner protective sleeve is arranged inside the outer protective sleeve and is coaxially and hermetically fixed through the sealing end cover ring; The outer protective sleeve, the inner protective sleeve and the sealing end cover ring are all made of smooth quartz glass material.

[0009] Preferably, a jacket inner cavity for the resistance heating wire to be spirally wound is formed between the outer protective sleeve and the inner protective sleeve.

[0010] Preferably, there are several groups of the support blocks, and each group of the support blocks is annularly distributed between the outer protective sleeve and the pipe-shaped housing; The support block is made of smooth quartz glass material.

[0011] Preferably, a through hole is opened at the center of the limit bracket, and the limit bracket is made of stainless steel or special material.

[0012] Preferably, the resistance heating wire is spirally wound between the outer protective sleeve and the inner protective sleeve; The resistance heating wire is made of Ni80Cr20 material.

[0013] A manufacturing method of a pipe-shaped high-temperature electric heater includes the following steps: A1: The pipe-shaped housing and the connecting flange are formed into one body by welding, and the inner surfaces of the pipe-shaped housing and the connecting flange are polished to form a smooth surface; A2: The spirally formed resistance heating wire is sleeved outside the inner protective sleeve, then the inner protective sleeve and the resistance heating wire as a whole are sleeved inside the outer protective sleeve, and the two ends of the resistance heating wire are led out of the outer protective sleeve. Then, the sealing end cover ring is installed at both ends of the outer protective sleeve and the inner protective sleeve, and is adhesively fixed and sealed with a high-temperature adhesive; A3: Then, the support blocks are annularly distributed on the outside of the outer protective sleeve and are evenly arranged at the same interval along the axis. The support blocks and the outer protective sleeve are adhesively fixed with a high-temperature adhesive. Then, the support blocks and the double-layer sealing sleeve assembly as a whole are inserted into the pipe-shaped housing, and the two ends of the resistance heating wire are led out of the pipe-shaped housing and are connected to the conductive rod connection end through a high-temperature insulating sealing kit; A4: Finally, a limit bracket is installed at one end of the pipe-shaped housing corresponding to the double-layer sealing sleeve assembly, and the limit bracket and the pipe-shaped housing are welded and fixed, and the pipe-shaped high-temperature electric heater is manufactured.

[0014] A using method of a pipe-shaped high-temperature electric heater includes the following steps: B1: One end of the pipe-shaped housing admits the medium to be heated, and the medium to be heated flows through the heating channel formed between the pipe-shaped housing and the double-layer sealed sleeve assembly and inside the double-layer sealed sleeve assembly to the other end of the pipe-shaped housing; B2: During the flow of the medium to be heated, the resistance heating wire is energized through the conductive rod connection end. At this time, the resistance heating wire generates a large amount of heat. The outer protective sleeve and the inner protective sleeve are in contact with the resistance heating wire, and the heat is transferred to the surfaces of the outer protective sleeve and the inner protective sleeve in the form of heat conduction, and then heat exchange contact is carried out with the medium to be heated in the heating channel, so that the medium to be heated takes away the heat and completes the heating of the medium to be heated.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, a pipe-shaped housing and a double-layer sealed sleeve assembly are adopted to improve the structure of the traditional electric heater. A pipe-shaped electric heater structure is adopted, and the cross-sectional volume of the flow channel between the pipe-shaped housing and the double-layer sealed sleeve assembly is small, the flow rate is fast, the temperature field is uniform, the flow resistance of the heated medium is reduced, and the equipment has a fast temperature rise rate and a fast cooling rate, and can efficiently cope with various sudden working conditions of customers; 2. The inner surface of the pipe-shaped housing in the present invention is formed into a smooth surface through polishing treatment, and the double-layer sealed sleeve assembly is made of smooth quartz glass material. It has excellent hot insulation resistance at high temperature, effectively isolates the resistance wire from the medium, and avoids the contact between impurities and the resistance wire, which may cause short circuit damage to the equipment. It ensures that the equipment can cope with various harsh working conditions and can heat various gases with conductive impurities. The design of the double-layer sealed sleeve assembly with double-layer isolation makes the medium to be heated not contact the resistance wire, and all conductive impurities in the materials cannot contaminate the resistance wire, fundamentally eliminating short circuit and dry burning, greatly increasing the service life of the electric heater, and ensuring the absolute smoothness of the heat exchange surface, avoiding impurity adsorption, affecting heat exchange and the service life of the equipment. At the same time, relying on the dual heat transfer of high-efficiency heat radiation and heat conduction, all heat energy can be fully utilized; 3. The double-layer sealed sleeve assembly made of ultra-high temperature smooth quartz glass material in the present invention enables the equipment to operate stably at 1000 °C and can be widely used in explosive gas / dust environment working conditions. Brief Description of the Drawings

[0016] Figure 1 It is the front sectional structure schematic diagram of the present invention; Figure 2 It is the left view structure schematic diagram of the present invention; Figure 3 It is the right view structure schematic diagram of the present invention.

[0017] In the figure: 1. Pipe-shaped outer shell; 2. Double-layer sealed sleeve assembly; 201. Outer protective sleeve; 202. Inner protective sleeve; 203. Sealed end cover ring; 3. Support block; 4. Limit bracket; 401. Through hole; 5. Resistance heating wire; 6. Conductive rod connection end; 7. Connecting flange; 8. High-temperature insulation sealing kit. Specific implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 3 , the pipe-shaped high-temperature electric heater provided by the present invention includes: Pipe-shaped outer shell 1, connecting flanges 7 are provided at both ends of the pipe-shaped outer shell 1, and the inner surface of the pipe-shaped outer shell 1 is formed into a smooth surface through polishing treatment; Double-layer sealed sleeve assembly 2, the double-layer sealed sleeve assembly 2 is arranged in the pipe-shaped outer shell 1 through the support block 3, and one end of the double-layer sealed sleeve assembly 2 is limited and supported by the limit bracket 4. The double-layer sealed sleeve assembly 2 includes an outer protective sleeve 201, an inner protective sleeve 202 and a sealed end cover ring 203; the inner protective sleeve 202 is arranged inside the outer protective sleeve 201 and is coaxially and hermetically fixed through the sealed end cover ring 203; the outer protective sleeve 201, the inner protective sleeve 202 and the sealed end cover ring 203 are all made of smooth quartz glass material. A jacket inner cavity for the resistance heating wire 5 to be spirally wound is formed between the outer protective sleeve 201 and the inner protective sleeve 202. There are several groups of support blocks 3, and each group of support blocks 3 is annularly distributed between the outer protective sleeve 201 and the pipe-shaped outer shell 1; the support block 3 is made of smooth quartz glass material, a through hole 401 is opened at the center of the limit bracket 4, and the limit bracket 4 is made of stainless steel or special material; In the present invention, the pipe-shaped outer shell 1 and the double-layer sealed sleeve assembly 2 are adopted to improve the structure of the traditional electric heater. The pipe-shaped electric heater structure is adopted, and the flow channel cross-sectional volume between the pipe-shaped outer shell 1 and the double-layer sealed sleeve assembly 2 is small, the flow rate is fast, the temperature field is uniform, the flow resistance of the heated medium is reduced, and the equipment has a fast temperature rise rate and a fast cooling rate, and can efficiently cope with various sudden working conditions of customers; In the present invention, the inner surface of the pipe-shaped outer shell 1 is formed into a smooth surface through polishing treatment, and the double-layer sealed sleeve assembly 2 is made of smooth quartz glass material, which has excellent hot insulation resistance at high temperatures, effectively isolates the resistance wire from the medium, avoids impurities contacting the resistance wire and causing short-circuit damage to the equipment, ensures that the equipment can cope with various harsh working conditions, and can heat various gases with conductive impurities. The design of the double-layer sealed sleeve assembly 2 with double-layer isolation makes the medium to be heated not contact the resistance wire, and the conductive impurities in all materials cannot contaminate the resistance wire, fundamentally eliminating short-circuit dry burning, greatly increasing the service life of the electric heater, and ensuring the absolute smoothness of the heat exchange surface, avoiding impurity adsorption, affecting heat exchange and the service life of the equipment. At the same time, relying on the dual heat transfer of high-efficiency heat radiation and heat conduction, all heat energy is fully utilized; The double-layer sealed sleeve assembly 2 made of ultra-high temperature smooth quartz glass material in the present invention enables the equipment to operate stably at 1000 °C and can be widely used in explosive gas / dust environment working conditions; The resistance heating wire 5 is arranged inside the double-layer sealed sleeve assembly 2, and both ends of the resistance heating wire 5 are respectively led out from the upper and lower sides of both ends of the pipe-shaped outer shell 1 and are connected to the conductive rod connection end 6 through the high-temperature insulation sealing kit 8 to improve the sealing and insulation performance in a high-temperature environment. The resistance heating wire 5 is spirally wound between the outer protection sleeve 201 and the inner protection sleeve 202; the resistance heating wire 5 is made of Ni80Cr20 material; A heating channel is formed between the pipe-shaped outer shell 1 and the double-layer sealed sleeve assembly 2 and inside the double-layer sealed sleeve assembly 2.

[0020] The manufacturing method of the pipe-shaped high-temperature electric heater provided in this embodiment includes the following steps: A1: The pipe-shaped outer shell 1 and the connecting flange 7 are welded into one body, and the inner surfaces of the pipe-shaped outer shell 1 and the connecting flange 7 are polished to form a smooth surface; A2: The spirally formed resistance heating wire 5 is sleeved outside the inner protection sleeve 202, then the inner protection sleeve 202 and the resistance heating wire 5 as a whole are sleeved inside the outer protection sleeve 201, and both ends of the resistance heating wire 5 are led out outside the outer protection sleeve 201. Then the sealing end cover ring 203 is installed at both ends of the outer protection sleeve 201 and the inner protection sleeve 202, and is adhesively fixed and sealed with a high-temperature adhesive; A3: Then the support blocks 3 are distributed annularly outside the outer protection sleeve 201 and are evenly arranged at the same interval along the axis. The support blocks 3 and the outer protection sleeve 201 are adhesively fixed with a high-temperature adhesive. Then the support blocks 3 and the double-layer sealed sleeve assembly 2 as a whole are inserted into the pipe-shaped outer shell 1, and both ends of the resistance heating wire 5 are led out outside the pipe-shaped outer shell 1 and are connected to the conductive rod connection end 6 through the high-temperature insulation sealing kit 8; A4: Finally, install a limit bracket 4 at one end of the pipe-type housing 1 corresponding to the double-layer sealed sleeve assembly 2, and weld and fix the limit bracket 4 and the pipe-type housing 1. Thus, the pipe-type high-temperature electric heater is completed.

[0021] The usage method of the pipe-type high-temperature electric heater provided in this embodiment includes the following steps: B1: Introduce the medium to be heated into one end of the pipe-type housing 1. The medium to be heated flows through the heating channel formed between the pipe-type housing 1 and the double-layer sealed sleeve assembly 2 and inside the double-layer sealed sleeve assembly 2 to the other end of the pipe-type housing 1. B2: During the flow of the medium to be heated, the resistance heating wire 5 is energized through the conductive rod connection end 6. At this time, the resistance heating wire 5 generates a large amount of heat. The outer protective sleeve 201 and the inner protective sleeve 202 are in contact with the resistance heating wire 5, and the heat is transferred to the surfaces of the outer protective sleeve 201 and the inner protective sleeve 202 in the form of heat conduction. Then, heat exchange contact is carried out with the medium to be heated in the heating channel, so that the medium to be heated takes away the heat, and the heating of the medium to be heated is completed.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline type high-temperature electric heater, characterized in that, Comprising: A pipe-shaped outer shell (1); A double-layer sealed sleeve assembly (2), the double-layer sealed sleeve assembly (2) is arranged inside the pipe-shaped outer shell (1) through a support block (3), and one end of the double-layer sealed sleeve assembly (2) is limited and supported by a limit bracket (4); A resistance heating wire (5), the resistance heating wire (5) is arranged inside the double-layer sealed sleeve assembly (2), and both ends of the resistance heating wire (5) are respectively led out from the upper and lower sides of both ends of the pipe-shaped outer shell (1) and are connected to a conductive rod connection end (6) through a high-temperature insulating and sealing kit (8); A heating channel is formed between the pipe-shaped outer shell (1) and the double-layer sealed sleeve assembly (2) and inside the double-layer sealed sleeve assembly (2).

2. The tubular high-temperature electric heater according to claim 1, characterized in that: Connection flanges (7) are arranged at both ends of the pipe-shaped outer shell (1).

3. The pipe-type high-temperature electric heater according to claim 2, wherein: The inner surface of the pipe-shaped outer shell (1) is formed into a smooth surface through polishing treatment.

4. The pipe-type high-temperature electric heater according to claim 1, wherein: The double-layer sealed sleeve assembly (2) includes an outer protective sleeve (201), an inner protective sleeve (202), and a sealing end cap ring (203); The inner protective sleeve (202) is arranged inside the outer protective sleeve (201) and is coaxially sealed and fixed through the sealing end cap ring (203); The outer protective sleeve (201), the inner protective sleeve (202), and the sealing end cap ring (203) are all made of smooth quartz glass material.

5. The pipe-shaped high-temperature electric heater according to claim 4, characterized in that: a jacket inner cavity for the resistance heating wire (5) to be spirally wound is formed between the outer protective sleeve (201) and the inner protective sleeve (202).

6. The pipe-type high-temperature electric heater according to claim 5, characterized in that: There are several groups of the support blocks (3), and each group of the support blocks (3) is annularly distributed between the outer protective sleeve (201) and the pipe-shaped outer shell (1); The support block (3) is made of smooth quartz glass material.

7. The pipeline type high-temperature electric heater according to claim 1, wherein: A through hole (401) is opened at the center of the limit bracket (4), and the limit bracket (4) is made of stainless steel or special material.

8. The pipeline type high-temperature electric heater according to claim 4, characterized in that: The resistance heating wire (5) is spirally wound between the outer protective sleeve (201) and the inner protective sleeve (202); The resistance heating wire (5) is made of Ni80Cr20 material.

9. The manufacturing method of a pipeline type high-temperature electric heater according to any one of claims 1-8, characterized in that, Including the following steps: A1: The pipe-shaped outer shell (1) and the connection flange (7) are formed into an integral body by welding, and the inner surfaces of the pipe-shaped outer shell (1) and the connection flange (7) are polished to form a smooth surface; A2: The spirally formed resistance heating wire (5) is sleeved outside the inner protective sleeve (202), then the inner protective sleeve (202) and the resistance heating wire (5) as a whole are sleeved inside the outer protective sleeve (201), both ends of the resistance heating wire (5) are led out outside the outer protective sleeve (201), and then the sealing end cap ring (203) is installed at both ends of the outer protective sleeve (201) and the inner protective sleeve (202), and is adhesively fixed and sealed with a high-temperature adhesive; A3: Then, the support blocks (3) are arranged in a circular distribution on the outer side of the outer protective sleeve (201) and evenly set at the same distance at intervals along the axis. The support blocks (3) and the outer protective sleeve (201) are adhesively fixed through a high-temperature adhesive. Then, the support blocks (3) and the double-layer sealed sleeve assembly (2) are integrally inserted into the pipe-shaped housing (1), and both ends of the resistance heating wire (5) are led out of the pipe-shaped housing (1) and connected to the conductive rod connection end (6) through a high-temperature insulation and sealing kit (8); A4: Finally, a limit bracket (4) is installed at one end of the pipe-shaped housing (1) corresponding to the double-layer sealed sleeve assembly (2), and the limit bracket (4) and the pipe-shaped housing (1) are welded and fixed, and the pipe-shaped high-temperature electric heater is completed.

10. A method for using a pipeline type high-temperature electric heater according to any one of claims 1-8, characterized in that, It includes the following steps: B1: A medium to be heated is introduced into one end of the pipe-shaped housing (1), and the medium to be heated flows through the heating channels formed between the pipe-shaped housing (1) and the double-layer sealed sleeve assembly (2) and inside the double-layer sealed sleeve assembly (2) to the other end of the pipe-shaped housing (1); B2: During the flow of the medium to be heated, the resistance heating wire (5) is energized through the conductive rod connection end (6). At this time, a large amount of heat is generated by the resistance heating wire (5). The outer protective sleeve (201) and the inner protective sleeve (202) are in contact with the resistance heating wire (5), and the heat is transferred to the surfaces of the outer protective sleeve (201) and the inner protective sleeve (202) in the form of heat conduction, and then heat exchange contact is made with the medium to be heated in the heating channel, so that the medium to be heated takes away the heat and the heating of the medium to be heated is completed.

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