Cylinder inner supporting assembly of high-temperature electric heater
By adding a transition ring and using a ceramic fiber blanket in the cylinder support assembly of the electric heater, the problems of heat loss and material stress reduction under high temperature conditions are solved, achieving more efficient heat transfer and material utilization, reducing costs and improving improve the reliability of the equipment.
Patent Information
- Application Number
- CN202421019517.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-01-21
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing electric heaters have problems such as heat loss, reduced material stress, bolt connection failure and water-cooled jackets increasing material costs under high temperature conditions.
A support component in the cylinder of a high-temperature electric heater is designed. By adding a transition ring between the support ring plate and the internal support ring, and setting a ceramic fiber blanket and a pressure ring at the connection, bolts, positioning pins and clamps are used. The connection method ensures the heat transfer sequence and the use of materials.
It effectively reduces heat loss, lowers the temperature of the support ring plate and cylinder, reduces material costs, and improves the reliability and economy of the equipment.
Smart Images
Figure CN222378474U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electric heaters, and in particular relates to a cylinder support component of a high-temperature electric heater. Background Art
[0002] An electric heater generally consists of a cylinder and an inner electric heating core. The gas enters from a pipe opening on one side, undergoes multi-mode heat transfer with the heating element in the cylinder, and then flows out from the pipe opening on the other side. The existing electric heater inner heating core usually adopts a light tube type, a resistance tube type, or a resistance wire type. When the gas temperature needs to be heated to a lower temperature, the allowable stress of the cylinder material will not decrease too much at low temperatures, so this structure can be directly used for design; however, when the gas temperature needs to be heated to a higher temperature, the allowable stress of the cylinder material will decrease sharply, and the selection of the cylinder material will become very difficult at this time. Generally, in the face of this problem, the basic methods of solving it are to modify the cylinder material, make an inner insulation layer, or make an external water-cooling jacket.
[0003] like Figure 2 As shown, the existing inner support assembly of the electric heater cylinder 1 is a support ring plate 3 + a support rib plate 4. The outer periphery of the support ring plate 3 is directly welded to the electric heater cylinder 1, and the support rib plate 4 is added below. The support ring plate 3 is in contact with the electric heater cylinder 1 and the temperature is the highest. A water cooling jacket 14 is added to the outer side of the electric heater cylinder 1 to cool it down. The inner periphery of the support ring plate 3 is in contact with the inner parts such as the electric heating core through the inner support ring 5. There are the following problems:
[0004] 1. The inner insulation layer only covers part of the support ring plate, so that the heat can still be transferred to the electric heater cylinder through the support ring plate, and the internal insulation cannot achieve the expected effect;
[0005] 2. The electric heating core and other internal parts are in direct contact with the internal support ring, and a large amount of heat is transferred to the support ring plate, causing heat loss;
[0006] 3. The internal parts of the electric heater are connected to the supporting components by bolts. When the temperature is too high, even if high-temperature resistant bolts are used, as the working time at high temperature increases, the stress of the bolts will decrease, and the preload will also decrease until it reaches a critical level. Then the connection may fail, and the bolts will melt and lock, resulting in inoperability during later maintenance;
[0007] 4. Bolt connections are tight, and there is no free expansion space under high temperature conditions, resulting in deformation and damage of support components;
[0008] 5. The support ring plate directly transfers heat to the cylinder of the electric heater. Even with the water cooling jacket, the temperature at the contact point between the support ring plate and the equipment cylinder cannot be guaranteed. The performance of the electric heater cylinder material needs to be considered and replaced with high-temperature resistant materials, but this will increase the material cost and is not economical. In addition, the water cooling jacket will increase the heat loss of the gas and cannot heat the gas temperature to the required temperature at the same power. It is not applicable when the outlet gas temperature needs to be higher.
[0009] To this end, we propose a cylinder support assembly for a high-temperature electric heater. Utility Model Content
[0010] The purpose of the utility model is to provide a cylinder support assembly for a high-temperature electric heater to solve the problems raised in the above-mentioned background technology.
[0011] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an in-cylinder support assembly of a high-temperature electric heater, comprising an electric heater cylinder, an electric heater inner part is arranged in the electric heater cylinder, a support ring plate is arranged on the inner circumference of the electric heater cylinder, a support rib plate connected to the electric heater cylinder is arranged at the bottom of the support ring plate, an inner part support ring is arranged on the outer side of the electric heater inner part, a transition ring is arranged between the support ring plate and the inner part support ring, and a ceramic fiber blanket and a pressure ring are arranged at the connection between the support ring plate and the inner part support ring and the transition ring.
[0012] Preferably, the support ring plate and the transition ring are fastened and connected by bolts.
[0013] Preferably, the transition ring is arranged on the upper part of the support ring plate, and the pressure ring and the ceramic fiber blanket are arranged in sequence from top to bottom between the transition ring, the support ring plate and the bolt.
[0014] Preferably, the support ring plate and the inner component support ring are connected via positioning pins and clamping blocks.
[0015] Preferably, the support ring plate is arranged at the bottom of the inner support ring, and the pressure ring and the ceramic fiber blanket are arranged in sequence from top to bottom at the connection between the support ring plate, the inner support ring and the positioning pin.
[0016] Preferably, the upper portion of the positioning pin passes through the inner component support ring and extends upward, and the clamping block is clamped on the positioning pin passing through the upper portion of the inner component support ring.
[0017] Preferably, a gasket is provided between the clamping block and the inner component support ring.
[0018] Preferably, an inner insulation layer that completely wraps the support ring plate is provided in the cylinder of the electric heater.
[0019] Compared with the prior art, the beneficial effects of the utility model are:
[0020] 1. In the utility model, a transition ring is added between the support ring plate and the inner support ring, and the heat transfer sequence is inner support ring → transition ring → support ring plate. At the same time, the size of the support ring plate is modified so that the inner insulation layer completely wraps the support ring plate, reducing the heat transferred to the support ring plate, and no longer directly contacts the central temperature of the inner part of the electric heater, and the inner insulation layer can fully play its role, reducing the temperature of the support ring plate and the electric heater cylinder, reducing the heat generated by the water cooling jacket, and under a given power, the gas can be heated to a predetermined temperature, which is energy-saving and environmentally friendly. The material of the support ring plate and the electric heater cylinder does not need to use high-temperature resistant materials, reducing material costs, and the support ring plate and the electric heater cylinder shell use the same material, reducing the difficulty of material selection and avoiding the problem of welding of dissimilar steels;
[0021] 2. In the utility model, ceramic fiber blankets and pressure rings are arranged at the connection between the support ring plate and the internal support ring and the transition ring. The ceramic fiber blanket has a small thermal conductivity, good manufacturability and stability under high and low temperature conditions, and can still maintain good tensile strength, toughness and fiber structure when used for a long time in a neutral and oxidizing atmosphere. It has good thermal insulation performance, chemical stability and thermal stability, and can resist thermal shock well. In this structure, the heat loss of the internal support ring and the heat conduction of the transition ring and the support ring plate can be reduced, and the thermal expansion space can be increased;
[0022] 3. In the utility model, bolts, positioning pins and clamps are used between the transition ring, the support ring plate and the inner support ring, which can be freely installed and disassembled, convenient for later maintenance, and the parts can be reused, which is more economical;
[0023] 4. In order to avoid bolt locking and failure to overhaul in the later stage, the utility model changes the connection mode between the transition ring and the inner support ring from threaded connection to positioning by locating pins through directional constraints after long-term high-temperature operation. The locating pins have good positioning effect and are easy to install. They are also convenient to disassemble and assemble during later overhaul. The transition ring and the support ring plate bracket are still connected by bolts, but the heat transferred to the bolts is reduced, the bolts are not easily damaged, and the installation of the inner insulation layer is not affected. If overhaul is required in the later stage, the transition ring does not need to be disassembled. Even if the bolts are damaged and cannot be disassembled, it will not affect the use.
[0024] 5. Add washers and blocks to the locating pins. The purpose of adding the blocks is to limit the position and increase a certain holding force to prevent excessive expansion, which may cause excessive movement of the internal support ring and plastic deformation. The purpose of adding washers is to play a buffering and isolating role between the blocks and the internal support ring, and to ensure easy adjustment during installation and disassembly, avoid scratches on the surface of components, reduce the compressive stress on the contact surface of the connected parts, and ensure a certain amount of free expansion space. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;
[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of an existing electric heater support assembly.
[0027] In the figure: 1. Electric heater cylinder; 2. Electric heater internals; 3. Support ring plate; 4. Support rib plate; 5. Internal support ring; 6. Transition ring; 7. Ceramic fiber blanket; 8. Pressure ring; 9. Bolt; 10. Locating pin; 11. Block; 12. Washer; 13. Inner insulation layer; 14. Water cooling jacket. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] See also Figure 1 The utility model provides a high-temperature electric heater cylinder support assembly, including an electric heater cylinder 1, an electric heater inner part 2 is arranged in the electric heater cylinder 1, a support ring plate 3 is arranged on the inner circumference of the electric heater cylinder 1, an inner insulation layer 13 is arranged in the electric heater cylinder 1 to completely wrap the support ring plate 3, a support rib plate 4 connected to the electric heater cylinder 1 is arranged at the bottom of the support ring plate 3, an inner part support ring 5 is arranged on the outer side of the electric heater inner part 2, a transition ring 6 is arranged between the support ring plate 3 and the inner part support ring 5, and a ceramic fiber blanket 7 and a pressure ring 8 are arranged at the connection between the support ring plate 3 and the inner part support ring 5 and the transition ring 6.
[0030] In the utility model, a transition ring 6 is added between the support ring plate 3 and the inner support ring 5, and the heat transfer sequence is the inner support ring 5 → transition ring 6 → support ring plate 3. At the same time, the size of the support ring plate 3 is modified so that the inner thermal insulation layer 13 completely wraps the support ring plate 3, reducing the heat transferred to the support ring plate 3, and no longer directly contacts the central temperature of the inner part 2 of the electric heater, and the inner thermal insulation layer 13 can fully play its role, thereby reducing the temperature of the support ring plate 3 and the electric heater cylinder 1, and reducing the heat generated by the water cooling jacket. Under a given power, the gas can be heated to a predetermined temperature, which is energy-saving and environmentally friendly. The materials of the support ring plate 3 and the electric heater cylinder 1 do not need to use high-temperature resistant materials, thereby reducing material costs, and the support ring plate 3 and the shell of the electric heater cylinder 1 use the same material, thereby reducing the difficulty of material selection and avoiding the problem of welding of dissimilar steels.
[0031] In this embodiment, Figure 1 As shown, the support ring plate 3 and the transition ring 6 are locked and connected by bolts 9, the transition ring 6 is arranged on the upper part of the support ring plate 3, and a pressure ring 8 and a ceramic fiber blanket 7 are arranged in sequence from top to bottom between the transition ring 6, the support ring plate 3 and the bolts 9;
[0032] The support ring plate 3 and the inner support ring 5 are connected by a positioning pin 10 and a clamping block 11. The support ring plate 3 is arranged at the bottom of the inner support ring 5. The connection between the support ring plate 3, the inner support ring 5 and the positioning pin 10 is provided with a pressure ring 8 and a ceramic fiber blanket 7 in sequence from top to bottom. The upper part of the positioning pin 10 passes through the inner support ring 5 and extends upward. The clamping block 11 is clamped on the positioning pin 10 passing through the upper part of the inner support ring 5.
[0033] In the utility model, ceramic fiber blankets 7 and pressure rings 8 are arranged at the connection between the support ring plate 3 and the inner support ring 5 and the transition ring 6. The ceramic fiber blanket has a small thermal conductivity, good manufacturability and stability under high and low temperature conditions, and can still maintain good tensile strength, toughness and fiber structure when used for a long time in a neutral and oxidizing atmosphere. It has good thermal insulation performance, chemical stability and thermal stability, and can resist thermal shock well. In this structure, the heat loss of the inner support ring 5 and the heat conduction of the transition ring 6 and the support ring plate 3 can be reduced, and the thermal expansion space can be increased;
[0034] Under high temperature conditions, the internal support ring 5 and the connecting parts will produce thermal expansion, but the surface roughness of the ceramic fiber blanket 7 is not conducive to free friction under high temperature conditions. A pressure ring 8 is added to the ceramic fiber blanket 7 to reduce friction and increase natural expansion space;
[0035] In the utility model, bolts 9, positioning pins 10 and clamping blocks 11 are used between the transition ring 6, the support ring plate 3 and the inner support ring 5, which can be freely installed and disassembled, and the later maintenance is convenient, and the parts can be repeatedly used, which is more economical;
[0036] In order to prevent the bolts 9 from being locked and unable to be repaired later after long-term high-temperature operation, the utility model changes the connection mode between the transition ring 6 and the inner support ring 5 from being fixed by threaded connection to being positioned by locating pins 11 through constraints in three directions. The locating pins 11 have good positioning effect and are easy to install and convenient to disassemble and assemble during later maintenance. The transition ring 6 and the support ring plate 3 bracket are still connected by bolts 9, but the heat transferred to the bolts 9 is reduced, the bolts 9 are not easily damaged, and the installation of the inner insulation layer 13 is not affected. If maintenance is needed later, the transition ring 6 does not need to be disassembled, and even if the bolts 9 are damaged and cannot be disassembled, it will not affect the use.
[0037] In this embodiment, Figure 1As shown, a gasket 12 is provided between the block 11 and the inner support ring 5. The gasket 12 and the block 11 are added to the positioning pin. The purpose of adding the block 11 is to limit the position and increase a certain holding force to prevent excessive expansion, which may cause excessive movement of the inner support ring 5 and plastic deformation. The purpose of adding the gasket 12 is to play a buffering and isolating role between the block 11 and the inner support ring 5, and to ensure convenient adjustment during installation and disassembly, avoid scratches on the surface of components, reduce the compressive stress on the contact surface of the connected parts, and ensure a certain free expansion space.
[0038] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A support assembly in a cylinder of a high-temperature electric heater, characterized in that: The electric heater cylinder (1) comprises an electric heater inner part (2) arranged inside the electric heater cylinder (1), a support ring plate (3) is arranged on the inner circumference of the electric heater cylinder (1), a support rib plate (4) connected to the electric heater cylinder (1) is arranged at the bottom of the support ring plate (3), an inner part support ring (5) is arranged on the outer side of the electric heater inner part (2), a transition ring (6) is arranged between the support ring plate (3) and the inner part support ring (5), and a ceramic fiber blanket (7) and a pressure ring (8) are arranged at the connection between the support ring plate (3) and the inner part support ring (5) and the transition ring (6).
2. The support assembly in the cylinder of a high-temperature electric heater according to claim 1, characterized in that: The supporting ring plate (3) and the transition ring (6) are locked and connected via bolts (9).
3. The inner support assembly of a high-temperature electric heater according to claim 2, characterized in that: The transition ring (6) is arranged on the upper part of the support ring plate (3), and the pressure ring (8) and the ceramic fiber blanket (7) are arranged in sequence from top to bottom between the transition ring (6), the support ring plate (3) and the bolt (9).
4. The inner support assembly of a high-temperature electric heater according to claim 1, characterized in that: The support ring plate (3) and the inner component support ring (5) are connected via a positioning pin (10) and a clamping block (11).
5. The inner support assembly of a high-temperature electric heater according to claim 4, characterized in that: The support ring plate (3) is arranged at the bottom of the inner support ring (5), and the pressure ring (8) and the ceramic fiber blanket (7) are arranged in sequence from top to bottom at the connection between the support ring plate (3), the inner support ring (5) and the positioning pin (10).
6. The inner support assembly of a high-temperature electric heater according to claim 5, characterized in that: The upper portion of the positioning pin (10) passes through the inner component support ring (5) and extends upwards, and the clamping block (11) is clamped on the positioning pin (10) passing through the upper portion of the inner component support ring (5).
7. The inner support assembly of a high-temperature electric heater according to claim 4, characterized in that: A gasket (12) is provided between the clamping block (11) and the inner component support ring (5).
8. The inner support assembly of a high-temperature electric heater according to claim 1, characterized in that: An inner thermal insulation layer (13) is arranged inside the electric heater cylinder (1) and completely wraps the support ring plate (3).