CN221076787U - Inside thermal-insulated barrel structure of high temperature electric heater - Google Patents
Inside thermal-insulated barrel structure of high temperature electric heater Download PDFInfo
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- CN221076787U CN221076787U CN202321770427.0U CN202321770427U CN221076787U CN 221076787 U CN221076787 U CN 221076787U CN 202321770427 U CN202321770427 U CN 202321770427U CN 221076787 U CN221076787 U CN 221076787U
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- heat insulation
- heat
- outer shell
- cavity
- electric heater
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- 238000009413 insulation Methods 0.000 claims abstract description 75
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 239000007769 metal material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 15
- 238000013461 design Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract description 2
- 239000011257 shell material Substances 0.000 description 27
- 230000003749 cleanliness Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses an internal heat insulation cylinder structure of a high-temperature electric heater. The heat-insulating shell comprises a heating element positioned at an upper port in an outer shell, a heat-insulating barrel body used for isolating the heating element from the outer shell is arranged in the outer shell, a ring cavity serving as an airflow channel is formed between the heat-insulating barrel body and the outer shell, an air inlet communicated with the ring cavity is formed in one side of a lower port of the outer shell, and when the heating element works, external air can enter the ring cavity through the air inlet to carry heat radiated by the heating element back to the inner cavity of the heat-insulating barrel body. The advantages are that: the whole structure design is reasonable, the radiation heat is fully utilized to raise the temperature through gas backflow, the heat loss of the heater is reduced, the external dimension of the equipment is controlled, the material consumption is reduced, the heating efficiency of the heater is improved, the heater can be heated to the preset temperature in a shorter time, the energy consumption loss is greatly reduced, and the purposes of energy conservation and emission reduction are realized.
Description
Technical Field
The utility model relates to a component structure of an industrial gas electric heater, in particular to an internal heat insulation cylinder structure of a high-temperature electric heater.
Background
The industrial gas electric heater structure at present generally consists of a shell and an electric heating core, wherein gas enters from a pipe orifice at one side of the shell, and flows out from a pipe orifice at the other side of the shell after heat transfer is carried out between the gas and a heating element in the shell; the heating core of the electric heater generally adopts a light pipe type, a resistance pipe type and a resistance wire type. When the temperature of the gas is required to be heated to a lower temperature, the allowable stress is not reduced too much due to the fact that the shell material is at a low temperature, and the structure can be directly adopted for design; however, when the gas temperature needs to be heated to a higher temperature, the allowable stress of the cylinder material is drastically reduced, and the selection of the cylinder material becomes difficult; in general, the problems are basically solved by adopting the following solutions of modifying the cylinder material, making an inner heat-insulating layer and making an outer water-cooling jacket:
(1) The cylinder body material is replaced by a material with higher temperature resistance, but the material cost is increased more, so that the economy is not realized;
(2) In order to ensure the gas flow and the heating efficiency, the internal flow diameter cannot be changed excessively, if an insulation layer is arranged in the device, the thickness of the insulation layer is generally thicker, and only the external size of the device can be modified, so that the external size of the device is increased more, the size requirement of the client device cannot be met, and the material cost is increased;
(3) The jacket water cooling mode can effectively reduce the temperature of the cylinder, but can increase the heat loss of gas, can not heat the gas to the required temperature under the same power, and is inapplicable under the condition that the temperature of the gas at the outlet is higher;
(4) In the high-temperature electric heater in certain test forms, gas is required to be clean, if the heat preservation layer is arranged in the heater, the heat preservation layer is damaged under the impact of air flow, so that broken slag of the heat preservation layer is mixed in outlet gas, and the cleanliness of the outlet air flow does not meet the test requirements.
Disclosure of Invention
The utility model aims to solve the technical problem of providing the internal heat insulation cylinder structure of the high-temperature electric heater, which has the advantages of low material cost, low heat loss and high heating efficiency and can meet the cleanliness requirement of test gas.
In order to solve the technical problems, the internal heat-insulating cylinder structure of the high-temperature electric heater comprises a heating element positioned at the upper port of an outer shell, a heat-insulating cylinder used for isolating the heating element from the outer shell is arranged in the outer shell, a ring cavity serving as an air flow channel is formed between the heat-insulating cylinder and the outer shell, one side of the lower port of the outer shell is provided with an air inlet communicated with the ring cavity, and when the heating element works, external air can enter the ring cavity through the air inlet to carry heat radiated by the heating element and return to the inner cavity of the heat-insulating cylinder.
An air inlet cavity protruding out of the heat insulation cylinder body is arranged on one side of the lower port of the outer shell body, a gas distribution cylinder used for being isolated from the annular cavity is arranged in the air inlet cavity, and the air inlet is connected to the air inlet cavity.
The bottom of the heat-insulating cylinder body is provided with a closed ring for sealing the bottom of the annular cavity, and one side of the upper end of the heat-insulating cylinder body is provided with a necking section for reducing the diameter of the upper end of the heat-insulating cylinder body.
The heat insulation cylinder is characterized in that a lower labyrinth heat insulation supporting component extending into the necking section is arranged in the heat insulation cylinder, and an upper labyrinth heat insulation supporting component matched with the lower labyrinth heat insulation supporting component to form a labyrinth flow channel structure is arranged at the upper port of the heat insulation cylinder.
The lower labyrinth heat insulation support assembly comprises a support ring plate arranged in the heat insulation cylinder body and a support cylinder arranged on the support ring plate and extending into the necking section.
The upper labyrinth heat insulation support assembly comprises a top support ring positioned at the upper port of the heat insulation cylinder body and two annular cylinders arranged at the lower part of the top support ring and used for forming an inserting cavity, and the support cylinder of the lower labyrinth heat insulation support assembly can be inserted into the inserting cavity to form the labyrinth runner structure.
The outer ring circumference of the top support ring is provided with a gear structure, and the top support ring is welded and fixed on the outer shell.
The heat insulation cylinder body, the lower labyrinth heat insulation supporting component and the upper labyrinth heat insulation supporting component are all made of metal materials.
The utility model has the advantages that:
(1) In terms of material selection, the shell wall temperature of the heating section of the high-temperature electric heater is effectively reduced, so that the material selection difficulty of the heater shell is greatly reduced, and the material cost is effectively reduced.
(2) From the aspect of structural dimension and cleanliness, the external dimension of the high-temperature electric heater is effectively controlled, the situation that the external dimension of equipment exceeds the limit due to the fact that an insulating layer is arranged in the traditional device is avoided, the device can be made small, meanwhile, the material cost is reduced, the transportation cost is increased, the space utilization rate is improved, in addition, the material of the heat insulation cylinder body is metal, the situation that the insulating pouring layer is broken and falls slag does not exist, the problem that the gas cleanliness is unqualified due to gas impact breakage is solved, and therefore the cleanliness of a heating medium can be guaranteed, and the cleanliness requirement of test gas is met.
(3) In terms of heat loss, the problem of a large amount of heat loss caused by the traditional water-cooling jacket type is avoided, and the gas can be heated to a preset temperature under a given power.
(4) The whole structure design is reasonable, the radiation heat is fully utilized to raise the temperature through gas backflow, the heat loss of the heater is reduced, the external dimension of the equipment is controlled, the material consumption is reduced, the heating efficiency of the heater is improved, the heater can be heated to the preset temperature in a shorter time, the energy consumption loss is greatly reduced, and the purposes of energy conservation and emission reduction are realized.
Drawings
FIG. 1 is a schematic diagram of the structure of a heat insulating cylinder inside a high-temperature electric heater according to the present utility model;
FIG. 2 is an enlarged schematic view of the structure of FIG. 1 at A;
FIG. 3 is a schematic top view of the top support ring of the present utility model.
Description of the embodiments
The structure of the heat insulation cylinder in the high-temperature electric heater is further described in detail below with reference to the accompanying drawings and the detailed description.
As shown in the figure, the internal heat insulation cylinder structure of the high-temperature electric heater comprises a heating element positioned at the upper port of the outer shell 1, wherein a heat insulation cylinder 2 for isolating the heating element from the outer shell is arranged in the outer shell 1, a ring cavity 3 serving as an air flow channel is formed between the heat insulation cylinder 2 and the outer shell 1, a closed ring 7 for closing the bottom of the ring cavity is arranged at the bottom end of the heat insulation cylinder 2, and the closed ring 7 is welded and connected between the heat insulation cylinder 2 and the outer shell (equipment cylinder); a necking section 8 which reduces the diameter of the upper end of the heat-insulating cylinder 2 is arranged on one side of the upper end of the heat-insulating cylinder 2, the heat-insulating cylinder 2 can be divided into three independent parts consisting of a lower heat-insulating cylinder, a middle necking section (a reducing conical shell) and an upper heat-insulating cylinder, and the lower heat-insulating cylinder is welded with the upper heat-insulating cylinder through the reducing conical shell; one side of the lower port of the outer shell 1 is provided with an air inlet cavity 5 protruding from the heat insulation cylinder, an air distribution cylinder 6 used for being isolated from the annular cavity is welded in the air inlet cavity 5, air holes used for uniformly distributing air are distributed on the air distribution cylinder 6, and meanwhile one side of the lower port of the outer shell 1 is provided with an air inlet 4 communicated with the annular cavity through the air inlet cavity 5, namely: the air inlet 4 is connected to the air inlet cavity 5, and when the heating element works, external air can enter the annular cavity through the air inlet 4 to carry heat radiated by the heating element and return to the inner cavity of the heat insulation cylinder.
Further, a lower labyrinth heat insulation supporting component 9 extending into the necking section is arranged in the heat insulation barrel 2, an upper labyrinth heat insulation supporting component 10 matched with the lower labyrinth heat insulation supporting component to form a labyrinth flow channel structure is arranged at the upper port of the heat insulation barrel 2, wherein the heat insulation barrel 2, the lower labyrinth heat insulation supporting component 9 and the upper labyrinth heat insulation supporting component 10 are all made of metal materials; as can be seen from fig. 2, the lower labyrinth insulation support assembly 9 comprises a support ring plate 11 welded and fixed in the insulation cylinder 2 and a support cylinder 12 welded at the upper part of the support ring plate and extending into the necking section, a sandwich structure is formed between the support cylinder 12 and the insulation cylinder 2, the upper labyrinth insulation support assembly 10 comprises a top support ring 13 positioned at the upper port of the insulation cylinder 2 and two annular cylinders 14 welded at the lower part of the top support ring and used for forming a plug-in cavity, the plug-in cavity of the upper labyrinth insulation support assembly 10 is plugged and matched with the support cylinder 12 of the lower labyrinth insulation support assembly, the upper labyrinth insulation support assembly 10 is inserted into the insulation cylinder 2 to form a labyrinth runner structure, that is to say, the sandwich structure formed between the support cylinder 12 and the insulation cylinder 2 and the plug-in cavities formed between the two annular cylinders 14 are mutually nested and connected, in addition, as shown in fig. 3, the outer circumference of the top support ring 13 is provided with a gear structure, the top support ring 13 is welded and fixed on the outer shell, and a gap formed by the gear structure is communicated with the annular cavity.
The gas enters from the gas inlet and passes through the gas distribution cylinder 6, and because a plurality of circles of ventilation holes are uniformly distributed on the gas distribution cylinder 6, the gas flow is more uniformly blown on the heat insulation cylinder 2, so that the gas is prevented from being intensively blown, and the dead zone of the gas flow cannot be cooled, so that the local overheating of the outer shell is caused; because the lower end of the heat-insulating cylinder body 2 is sealed by adopting the sealing ring 7, gas can only flow upwards along the annular cavity channel between the equipment shell (namely, the outer shell) and the heat-insulating cylinder body 2, heat radiated by the heating element (the heating core) is taken away in the process, the temperature of the cylinder body is effectively reduced, meanwhile, radiant heat which is wasted originally is fully utilized to preheat the cylinder body, and heat loss is reduced.
The gas always goes up to the labyrinth flow passage structure (see figure 2), the cylinders with various sizes (supporting cylinders and annular cylinders) are mutually nested, and a series of intercepting gaps are formed between the supporting ring plate 11 and the top supporting ring 13, so that the gas cannot directly flow into the labyrinth flow passage structure from the intercepting gaps to form short circuits, and the temperature rise of the gas cannot reach expectations. Meanwhile, an expansion cavity with a certain length is reserved, a certain space is reserved for expansion and elongation of the heat insulation cylinder body 2 after temperature rise, and the heat insulation cylinder body 2 is prevented from being limited in thermal expansion and elongation, so that deformation of the heat insulation cylinder body is prevented, and interference is generated on an internal heating core; because the airflow resistance of the labyrinth flow passage structure is large, the gas can flow upwards and pass through the top support ring 13, and because the top support ring 13 is in a gear form, the gas can uniformly pass through a gap formed by the gear structure, flow downwards from the upper space, heat is transferred with the heating core, and then the temperature is raised and flows out from the outlet below.
Claims (8)
1. The utility model provides a high temperature electric heater inside thermal-insulated barrel structure, includes the heating element that is located in last port department in shell body (1), its characterized in that: the heat-insulating cylinder is characterized in that a heat-insulating cylinder body (2) used for isolating a heating element from the outer shell body is arranged in the outer shell body (1), a ring cavity (3) serving as an airflow channel is formed between the heat-insulating cylinder body (2) and the outer shell body (1), an air inlet (4) communicated with the ring cavity is formed in one side of a lower port of the outer shell body (1), and when the heating element works, external air can enter the ring cavity through the air inlet (4) to carry heat radiated by the heating element and return to an inner cavity of the heat-insulating cylinder body.
2. The internal heat insulation cylinder structure of a high temperature electric heater as claimed in claim 1, wherein: an air inlet cavity (5) protruding out of the heat insulation cylinder body is arranged on one side of the lower port of the outer shell (1), a gas distribution cylinder (6) used for being isolated from the annular cavity is arranged in the air inlet cavity (5), and the air inlet (4) is connected to the air inlet cavity (5).
3. The internal heat insulation cylinder structure of a high temperature electric heater according to claim 1 or 2, wherein: the bottom of the heat insulation cylinder body (2) is provided with a closed ring (7) for sealing the bottom of the annular cavity, and one side of the upper end of the heat insulation cylinder body (2) is provided with a necking section (8) for reducing the diameter of the upper end of the heat insulation cylinder body (2).
4. A high temperature electric heater internal heat insulation cylinder structure according to claim 3, wherein: the heat insulation cylinder body (2) is internally provided with a lower labyrinth heat insulation supporting component (9) extending into the necking section, and an upper labyrinth heat insulation supporting component (10) matched with the lower labyrinth heat insulation supporting component to form a labyrinth flow channel structure is arranged at the upper port of the heat insulation cylinder body (2).
5. The internal heat insulation cylinder structure of high temperature electric heater as set forth in claim 4, wherein: the lower labyrinth heat insulation support assembly (9) comprises a support ring plate (11) arranged in the heat insulation cylinder body (2) and a support cylinder (12) which is arranged on the support ring plate and stretches into the necking section.
6. The internal heat insulation cylinder structure of high temperature electric heater as set forth in claim 5, wherein: the upper labyrinth heat insulation support assembly (10) comprises a top support ring (13) positioned at the upper port of the heat insulation cylinder body (2) and two annular cylinders (14) arranged at the lower part of the top support ring and used for forming an inserting cavity, and the support cylinder (12) of the lower labyrinth heat insulation support assembly can be inserted into the inserting cavity to form the labyrinth runner structure.
7. The internal heat insulation cylinder structure of high temperature electric heater as set forth in claim 6, wherein: the circumference of the outer ring of the top support ring (13) is provided with a gear structure, and the top support ring (13) is welded and fixed on the outer shell.
8. The internal heat insulation cylinder structure of high temperature electric heater as set forth in claim 7, wherein: the heat insulation cylinder body (2), the lower labyrinth heat insulation supporting component (9) and the upper labyrinth heat insulation supporting component (10) are all made of metal materials.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221076787U true CN221076787U (en) | 2024-06-04 |
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