CN113251656A - Hollow resistance tube directly-heated electric heater - Google Patents
Hollow resistance tube directly-heated electric heater Download PDFInfo
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- CN113251656A CN113251656A CN202110616539.XA CN202110616539A CN113251656A CN 113251656 A CN113251656 A CN 113251656A CN 202110616539 A CN202110616539 A CN 202110616539A CN 113251656 A CN113251656 A CN 113251656A
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- electric heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1863—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2071—Arrangement or mounting of control or safety devices for air heaters using electrical energy supply
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- Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
The invention discloses a hollow resistance tube directly-heated electric heater. The electric heater is a pipe body with straight sections, the front end and the rear end of which are closed, the middle section of which is equal to the straight section, and the front end of the electric heater is externally connected with a high-pressure air source through an inlet flange; the equal straight section is divided into a front section and a rear section which are connected through a large flange, and the rear end is connected with an air inlet of the wind tunnel through an outlet flange; the rear section of the equal straight section is an outer shell, the front section of the outer shell is provided with 3 extraction electrodes, the surface of the rear section of the outer shell is provided with a temperature measuring component, a heat insulation cylinder is sleeved inside the temperature measuring component, and a heating core component is arranged in a cavity of the heat insulation cylinder; the heating core assembly consists of a plurality of hollow resistance tubes and is positioned and fixed through a row of supporting plates; insulating ceramic is sleeved at the position where the hollow resistance tube passes through the supporting plate; the hollow resistance tubes are divided into 3 groups, and each group is sequentially connected end to end through a connecting plate to respectively form A, B, C three phases and is communicated with an external power supply through a leading-out electrode. The electric heater has smaller overall structure and higher temperature rise and reduction speed, and is suitable for carrying out tests in the hypersonic wind tunnel.
Description
Technical Field
The invention belongs to the technical field of electric heating, and particularly relates to a hollow resistance tube directly-heated electric heater.
Background
At present, most of electric heaters adopt traditional electric heating tubes, and the traditional electric heating tubes mainly heat media flowing on the outer wall in a forced convection heat exchange mode. A resistance wire is arranged in the traditional electric heating pipe, and an insulated heat conduction material is filled between the resistance wire and the electric heating pipe. When heating, the resistance wire is electrified to raise the temperature, the resistance wire transmits heat to the electric heating tube through the heat conduction material, and the heated medium (gas or liquid) flows through the outer wall of the electric heating tube to be heated. The resistance wire is used for heating, heat is transferred to the electric heating tube, and the electric heating tube heats the medium, so that the method is widely applied to engineering. The advantages are mature technology, simple structure, complete insulation of heating element and medium, and can be used for heating corrosive gas or liquid; moreover, the sealing part is welded and sealed, and the reliability is high. However, the defects are obvious, and because the heating is indirect, the thermal inertia is large, and the heating speed and the cooling speed are slow; meanwhile, the power density of the heating element is low, so that the whole volume is large, the occupied space is large, and the manufacturing cost of the electric heater is high.
With the development of the electric heater technology, the structure of the electric heater needs to be further improved in the field of hypersonic wind tunnel tests. Currently, there is a need to develop an air-core resistance tube direct-heating electric heater for rapidly heating high-pressure pure air.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hollow resistance tube directly-heated electric heater.
The invention relates to a hollow resistance tube directly-heated electric heater, which is characterized in that the electric heater is a straight tube body with closed front and back ends and a middle section, and the tube body is horizontally supported on a mounting plane through a series of saddles arranged in front and back; the front end of the tube body is provided with an air inlet which is externally connected with a high-pressure air source through an inlet flange; the equal straight section of the pipe body is divided into a front section and a rear section, and the front section and the rear section are connected through a large flange; the rear end of the pipe body is provided with an air outlet which is connected with an air inlet of the wind tunnel through an outlet flange;
the inner cavity of the rear section of the tube body and positioned at the rear side of the large flange connecting end surface is a rectification cavity, the tube body behind the rectification cavity is an outer shell, the front section of the outer shell is provided with 3 electrode leading-out holes (16), 1 leading-out electrode is installed in each electrode leading-out hole (16), the inner wall of the rear section of the outer shell is sleeved with a heat insulation tube coaxial with the tube body, a heating core assembly is installed in the cavity of the heat insulation tube, and a temperature measuring assembly for measuring the temperature of the heating core assembly is also installed on the outer shell;
the heating core assembly is composed of a plurality of hollow resistance tubes which are arranged in an array way and are parallel to the central axis of the tube body, and the heating core assembly passes through a series of a plurality of supporting plates which are arranged along the central axis of the tube body in sequence from front to back for positioning and fixing; insulating ceramic is sleeved at the position where the hollow resistance tube passes through the supporting plate;
the plurality of hollow-core resistance tubes of the heating core assembly are divided into 3 groups, the 3 hollow-core resistance tubes positioned in the center form a neutral point, and the hollow-core resistance tubes close to the electrode leading-out holes (16) are connected with electrode leading-out busbars (17); each group of resistance tubes are sequentially connected from the respective neutral point end to end through the connecting plate until the corresponding electrode leading-out busbar (17) of the group is connected, and the electrode leading-out busbar (17) is connected with the leading-out electrode to form a 1-circuit connecting circuit; the 3 circuit connecting lines respectively form A, B, C three phases of the electric heater, and A, B, C three phases of the electric heater are communicated with an external power supply to form an electric heater circuit.
Furthermore, the hollow resistance tube is made of high-temperature stainless steel GH 3030.
Further, the large flange is characterized in that the material of the large flange is 16Mn III forging.
Further, the outer shell is an integrally forged cylinder; the material of the outer shell is 16Mn III forging.
Furthermore, the heat insulation cylinder is fixedly connected to the inner wall of the outer shell through spot welding, and the heat insulation cylinder is made of stainless steel S30408.
Furthermore, the heat insulation cylinder is a multi-layer heat insulation cylinder, and the heat insulation cylinders are fixedly connected through spot welding;
furthermore, the edge of the supporting plate is provided with air holes along the circumferential direction.
Furthermore, the connecting plate is a lath, 2 through holes matched with the resistance tubes are formed in the lath, and the connecting plate penetrates through the front ends or the rear ends of two adjacent resistance tubes to be in circuit connection according to the connection requirement of a circuit connection circuit; the connecting plate is made of high-temperature stainless steel GH 3030.
Further, the connecting plate is a set of thin plates or flexible thin plates in an omega shape.
Furthermore, the sharp corners of the insulating ceramics are all rounded, and the two ends of the insulating ceramics are provided with anti-loosening gaskets and are locked and fixed through locking nuts (15); the insulating ceramic is made of silicon nitride ceramic rings.
The invention relates to an air-core resistance tube directly-heated electric heater which mainly comprises three parts, namely an outer shell, a heating core assembly and a flange.
The outer shell is mainly used as a pressure-bearing shell of high-pressure pure air and needs to bear higher airflow pressure; meanwhile, a heating core assembly is arranged in the outer shell and consists of a plurality of hollow resistance tubes which are arranged in an array mode, and therefore a support plate with enough strength is required in the outer shell and used for supporting all the hollow resistance tubes, the heat insulation cylinder, the insulating ceramic fastener, the temperature measuring sensor and the like in the electric heater. There are several layers of metal heat insulating cylinders close to the inner wall of the outer shell to separate the outer shell from the heating core assembly, and the outer shell does not bear high temperature inside basically. The hollow resistance tubes are fixed by a series of support plates arranged at regular intervals. And insulating ceramics are arranged between the hollow resistance tube and the support plate. Besides the holes formed at the positions where the supporting plates penetrate through the hollow resistance tubes, small through holes are also formed in the circumferential edges, so that the inner wall and the outer wall of each hollow resistance tube are equal in pressure, and the hollow resistance tubes do not bear high-pressure action. The insulating ceramic not only plays an insulating role, but also plays a supporting role, under the action of high-pressure airflow, the hollow resistance tube can vibrate, and the insulating ceramic must have very strong high-temperature resistance and vibration resistance.
High-pressure pure air flows in the pipeline of the hollow resistance tube of the heating core assembly, and after the hollow resistance tube is electrified, the high-pressure pure air flowing in the pipeline of the hollow resistance tube generates forced convection heat exchange with the hollow resistance tube, so that the heat of the hollow resistance tube is transferred to the high-pressure pure air; meanwhile, the hollow resistance tube is not sealed outside, and a small part of gas flows through the hollow resistance tube, so that the inner wall and the outer wall of the hollow resistance tube serving as the heating part are not stressed; when the high-pressure pure air flows out of the air-core resistance tube, the high-pressure pure air is heated to a certain temperature. The hollow resistance tubes are divided into 3 groups, each group is connected end to end, a phase is formed on a circuit, A, B, C three phases are formed, and A, B, C three phases are led out of the electric heater by the lead-out electrodes.
The flanges include an inlet flange, an outlet flange, and a large flange. The inlet flange and the outlet flange are used for connecting the electric heater with the front pipeline and the rear pipeline of the wind tunnel, and the large flange is used for connecting the front section and the rear section of the equal straight section, so that the pressure bearing strength of the inlet flange, the outlet flange and the large flange is the same as that of the outer shell.
The air-core resistance tube direct heating type electric heater mainly has the following characteristics:
1. the outer shell bears pressure but not heat;
2. the hollow resistance tube bears heat but not pressure;
3. a plurality of hollow resistance tubes with the same specification are connected end to form a phase;
4. the insulating ceramic has insulating and supporting functions and can bear vibration caused by airflow flow.
The hollow resistance tube directly-heated electric heater adopts the hollow resistance tube as the directly-heated heating element, has smaller integral structure and higher heating and cooling speed under the condition of meeting the same power, and is suitable for quickly heating high-pressure pure air after a high-pressure valve in the hypersonic wind tunnel test process.
Drawings
FIG. 1 is a schematic structural view of an air-core resistance tube direct-heating electric heater according to the present invention;
FIG. 2 is a schematic diagram of the fixing and circuit connection of the supporting plate of the heating core assembly in the hollow resistance tube direct heating electric heater according to the present invention;
fig. 3 is a cross-sectional view of the position of the extraction electrode in the air-core resistance tube direct heating type electric heater of the present invention.
In the figure, 1, an inlet flange, 2, a large flange, 3, a rectifying cavity, 4, an extraction electrode, 5, an outer shell, 6, a heating core assembly, 7, a heat insulation cylinder, 8, a support plate, 9, a temperature measuring assembly, 10, an outlet flange, 11, a saddle, 12, a connecting plate, 13, a check gasket, 14, insulating ceramic, 15, a locking nut, 16, an electrode extraction hole and 17, an electrode extraction busbar are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, the inlet end of the electric heater is connected with the high-pressure air source high-pressure pipeline at the front end by an inlet flange 1, and the outlet end of the electric heater is connected with the wind tunnel air inlet high-pressure pipeline at the rear end by an outlet flange 10. The large flange 2 of the electric heater is mainly used as a connecting piece for a front-end inlet and rear-end equipment, and in addition, if the internal structural part of the electric heater needs to be checked, the large flange 2 needs to be opened, so that the maintenance of workers is facilitated. In order to ensure that the electric heater has better pressure-bearing capacity, the materials of the outer shell 5 and the large flange 2 are forged by 16Mn III. The shell 5 and the barrel are manufactured by adopting a 16Mn III integral forging method, so that on one hand, the uniformity of the barrel material in all directions is ensured, and on the other hand, the roundness of the barrel is not out of tolerance. After the high-pressure pure air enters the outer shell 5 from the air inlet pipe, the high-pressure pure air enters the rectification cavity 3, the cavity volume of the rectification cavity 3 is large, and after the high-pressure pure air with the high flow speed enters the rectification cavity 3, the speed is reduced, so that the effect of rectifying the high-pressure pure air is achieved. The rectified high-pressure pure air uniformly flows into the heating core assembly 6 for heat exchange. The extraction electrode 4 is located at the front end of the heater-wick assembly 6 in fig. 1, since there is cold air here, and there is no need to consider cooling of the extraction electrode 4. According to the result of power theory calculation, 24 hollow resistance tubes are arranged in the electric heater as the heating core assembly 6, and the hollow resistance tubes are made of high-temperature stainless steel GH 3030. The heating core assembly 6 is fixed in the electric heater outer case 5 by 3 support plates 8. Meanwhile, a double-layer heat insulation cylinder 7 is arranged between the outer shell 5 and the supporting plate 8, so that the heat radiated to the outer shell 5 by the heating core assembly 6 is reduced, the heat loss is reduced, the temperature of the wall surface of the outer shell 5 is also reduced, and the safety of workers is guaranteed. The heat insulation cylinder 7 is made of stainless steel S30408. The temperature measuring component 9 is arranged in the electric heater and is positioned at the position close to the back of the electric heater, and the probe of the temperature measuring component is close to the heating core component 6 and is used for monitoring the temperature of the heating core component 6, so that the heating core component 6 is prevented from being burnt by over-temperature. And 2 saddles 11 are arranged below the electric heater, are used for supporting the weight of the whole electric heater and are used for installing and fixing the electric heater body.
As shown in fig. 2, each group of 8 hollow resistance tubes are connected end to end by welding through a connecting plate 12, and the connecting plate 12 is made of the same material as the hollow resistance tubes and is also GH3030 because the welding performance of the same material is better. By increasing the thickness and number of the connecting plates 12, the contact area between the heating core assembly 6 and the connecting plates 12 can be increased, and normal circulation of current is ensured. Furthermore, the connecting plate 12 adopts a group of omega-shaped flexible thin plates, on one hand, the current flowing cross section area between the heating core assemblies 6 is increased, and the heat productivity of the part is reduced; and on the other hand, the high-temperature expansion of two adjacent heating core assemblies 6 in the length direction can be effectively absorbed. Air vents are formed between the heater core assemblies 6 in the area near the middle of the connecting plates 12 to allow air flow between the connecting plates 12, which cools the area, thereby reducing the surface temperature of the connecting plates 12. And the heating core assembly 6 and the support plate 8 are completely insulated by adopting insulating ceramics 14, and the insulating ceramics 14 adopts a special silicon nitride porcelain ring structure. The silicon nitride material has excellent cold and hot shock resistance and high strength at high temperature, and can effectively avoid the problem of ceramic fragmentation caused by cold and hot shock. In addition, the silicon nitride ceramic ring needs to withstand the high temperature and the vibration transmitted from the heating tube. All sharp corners of the silicon nitride porcelain ring are rounded off, so that the silicon nitride porcelain ring is prevented from being broken due to vibration in the operation process. The end of the insulating ceramic 14 is sequentially provided with a locking washer 13 and a locknut 15, and is fixed by the locknut 15, thereby preventing the insulating ceramic 14 from vibrating during operation.
As shown in fig. 3, 3 electrode lead-out holes 16 are opened at the inlet end of the electric heater, and are used as mounting holes for A, B, C three-phase lead-out electrodes 4. In addition, 3 electrode leading-out busbars 17 are arranged, and the leading-out busbars 17 are made of the same material as the heating core assembly 6 and are welded with the heating core assembly 6. The heating core assembly 6 is connected to the extraction electrode 4 through the electrode extraction busbar 17, so that the heating core assembly 6 is extracted to the outside of the electric heater. The heat insulation cylinder 7 is connected with the inner cavity of the outer shell 5 through spot welding, and the support plate 8 is connected with the inner cavity of the heat insulation cylinder 7 through spot welding. In addition, because the edge of the supporting plate 8 is divided by small holes, the outer wall surface of the heating core assembly 6 is provided with air flow, so that the inner wall and the outer wall of the heating core assembly 6 are in equal pressure, and the heating core assembly 6 only bears heat and is not pressed. The heating core assembly 6 is divided into A, B, C three phases, each phase is formed by connecting 8 hollow resistance tubes in series end to end in a welding mode, and a resistance element is formed on a circuit. For example, 8 air-core resistor tubes of phase a are connected in series to form a resistor element. For the same reason, the B-phase and the C-phase constitute one resistance element in the same manner. A. B, C the tail ends of the three-phase resistance elements are connected together to form the neutral point of the three-phase star circuit, the head ends of the three phases are connected with the external three-phase symmetrical power supply through the extraction electrode 4, and the heating core assembly 6 of the electric heater can be electrified and heated.
The during operation, high-pressure air source compression high-pressure pure air gets into rectification chamber 3 through entry flange 1, and a plurality of hollow resistance tubes of rethread shunt, and under the pressure effect, high-pressure pure air flows from the past backward in hollow resistance tube, at the in-process that flows, and the hollow resistance tube with the high temperature after the circular telegram carries out forced convection heat transfer heating and heaies up, when high-pressure pure air flows out from electric heater in, has been heated to required temperature, gets into the wind-tunnel through outlet flange 10 again.
Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, but it can be applied to various fields suitable for the present invention. Additional modifications and refinements of the present invention will readily occur to those skilled in the art without departing from the principles of the present invention, and therefore the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (10)
1. A direct heating type electric heater with hollow resistance tubes is characterized in that the electric heater is a straight tube body with closed front and back ends and an equal middle section, and the tube body is horizontally supported on a mounting plane through a series of saddles (11) arranged in front and back; the front end of the tube body is provided with an air inlet which is externally connected with a high-pressure air source through an inlet flange (1); the equal straight section of the pipe body is divided into a front section and a rear section, and the front section and the rear section are connected through a large flange (2); the rear end of the pipe body is provided with an air outlet which is connected with an air inlet of the wind tunnel through an outlet flange (10);
the rear section of the pipe body and the inner cavity positioned at the rear side of the connecting end face of the large flange (2) are rectification cavities (3), the rear pipe body of the rectification cavity (3) is an outer shell body (5), the front section of the outer shell body (5) is provided with 3 electrode leading-out holes (16), 1 leading-out electrode (4) is installed in each electrode leading-out hole (16), a heat insulation cylinder (7) coaxial with the pipe body is sleeved on the inner wall of the rear section of the outer shell body (5), a heating core assembly (6) is installed in a cavity of the heat insulation cylinder (7), and a temperature measuring assembly (9) for measuring the temperature of the heating core assembly (6) is also installed on the outer shell body (5);
the heating core assembly (6) is composed of a plurality of hollow resistance tubes which are arranged in an array way and are parallel to the central axis of the tube body, and the heating core assembly (6) passes through a series of a plurality of supporting plates (8) which are arranged along the central axis of the tube body in sequence from front to back for positioning and fixing; insulating ceramics (14) are sleeved at the position where the hollow resistance tube passes through the support plate (8);
the plurality of hollow-core resistance tubes of the heating core assembly (6) are divided into 3 groups, the 3 hollow-core resistance tubes positioned in the center form a neutral point, and the hollow-core resistance tubes close to the electrode leading-out holes (16) are connected with an electrode leading-out bus bar (17); each group of resistance tubes are sequentially connected end to end from respective neutral points through a connecting plate (12) until the corresponding electrode leading-out busbar (17) of the group is connected, and the electrode leading-out busbar (17) is connected with the leading-out electrode (4) to form a 1-circuit connecting circuit; the 3 circuit connecting lines respectively form A, B, C three phases of the electric heater, and A, B, C three phases of the electric heater are communicated with an external power supply to form an electric heater circuit.
2. An air-core resistance tube direct-heating electric heater as claimed in claim 1, characterized in that the material of the air-core resistance tube is high temperature stainless steel GH 3030.
3. An air core resistance tube directly heated electric heater according to claim 1, characterized in that the material of the large flange (2) is 16Mn iii forging.
4. Hollow core resistance tube direct heating electric heater according to claim 1, characterized in that the outer shell (5) is a monobloc forged cylinder; the material of the outer shell (5) is 16Mn III forging.
5. The air core resistance tube direct heating type electric heater according to claim 1, wherein the heat insulation cylinder (7) is fixedly connected to the inner wall of the outer shell (5) by spot welding, and the heat insulation cylinder (7) is made of stainless steel S30408.
6. An air-core resistance tube direct-heating type electric heater according to claim 5, characterized in that the heat-insulating cylinder (7) is a multi-layer heat-insulating cylinder, and the heat-insulating cylinders are fixedly connected by spot welding.
7. An air-core resistance tube direct-heating electric heater as claimed in claim 1, characterized in that the edge of the supporting plate (8) is provided with air holes along the circumferential direction.
8. A hollow resistance tube direct-heating electric heater as claimed in claim 1, wherein said connecting plate (12) is a strip, 2 through holes are provided on the strip for fitting with the resistance tubes, and the connecting plate passes through the front or rear ends of two adjacent resistance tubes for circuit connection according to the connection requirement of the circuit connection circuit; the connecting plate (12) is made of high-temperature stainless steel GH 3030.
9. An air core resistance tube direct heating electric heater in accordance with claim 8, characterized by, that the connection plate (12) is a set of thin strips or omega shaped flexible thin strips.
10. The direct-heating type electric heater with hollow resistance tubes as claimed in claim 1, wherein the sharp corners of the insulating ceramic (14) are all rounded, and the two ends of the insulating ceramic (14) are provided with anti-loosening gaskets (13) and are locked and fixed by locking nuts (15); the insulating ceramic (14) is made of a silicon nitride ceramic ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110616539.XA CN113251656A (en) | 2021-06-03 | 2021-06-03 | Hollow resistance tube directly-heated electric heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110616539.XA CN113251656A (en) | 2021-06-03 | 2021-06-03 | Hollow resistance tube directly-heated electric heater |
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| CN113251656A true CN113251656A (en) | 2021-08-13 |
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| CN202110616539.XA Pending CN113251656A (en) | 2021-06-03 | 2021-06-03 | Hollow resistance tube directly-heated electric heater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115264943A (en) * | 2022-09-23 | 2022-11-01 | 中国空气动力研究与发展中心超高速空气动力研究所 | Ultra-large vertical heat storage type heater for large hypersonic wind tunnel |
| CN115265248A (en) * | 2022-09-23 | 2022-11-01 | 中国空气动力研究与发展中心超高速空气动力研究所 | Internal element supporting device for ultra-large heat accumulating type heater and mounting method |
| WO2023106992A1 (en) * | 2021-12-10 | 2023-06-15 | Kanthal Ab | Electric gas heater |
| CN116465092A (en) * | 2023-06-20 | 2023-07-21 | 无锡大洋高科热能装备有限公司 | Resistance tube type electric heater |
| WO2023200972A1 (en) * | 2022-04-13 | 2023-10-19 | Watlow Electric Manufacturing Company | Medium voltage bus system for electric circulation heaters |
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| CN115265248B (en) * | 2022-09-23 | 2023-03-10 | 中国空气动力研究与发展中心超高速空气动力研究所 | Internal element supporting device for ultra-large heat storage type heater and mounting method |
| CN115264943B (en) * | 2022-09-23 | 2023-04-21 | 中国空气动力研究与发展中心超高速空气动力研究所 | Ultra-large vertical heat accumulating type heater for large hypersonic wind tunnel |
| CN116465092A (en) * | 2023-06-20 | 2023-07-21 | 无锡大洋高科热能装备有限公司 | Resistance tube type electric heater |
| CN116465092B (en) * | 2023-06-20 | 2023-08-29 | 无锡大洋高科热能装备有限公司 | Resistance tube type electric heater |
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Application publication date: 20210813 |
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