CN113079604B - High-pressure water-cooling sealing structure for electric arc heater - Google Patents
High-pressure water-cooling sealing structure for electric arc heater Download PDFInfo
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- CN113079604B CN113079604B CN202110365923.7A CN202110365923A CN113079604B CN 113079604 B CN113079604 B CN 113079604B CN 202110365923 A CN202110365923 A CN 202110365923A CN 113079604 B CN113079604 B CN 113079604B
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- inner shell
- pressure water
- reinforcing ring
- sealing structure
- arc heater
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/18—Heating by arc discharge
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/12—Arrangements for cooling, sealing or protecting electrodes
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Gasket Seals (AREA)
- Resistance Heating (AREA)
Abstract
The invention discloses a high-pressure water-cooling sealing structure for an electric arc heater. The high-pressure water-cooling sealing structure comprises a cooling water cavity arranged in an inner shell and a reinforcing ring arranged on the end face of the inner shell; the sealing ring is positioned in the annular groove of the outer shell and used for sealing the contact end surface of the inner shell and the outer shell; the method also comprises the step of spraying a NiCrAlY coating on the wall surface of the inner shell by adopting an ultrasonic flame spraying process; the width range of the reinforcing ring is 5-8 mm, and the inner diameter and the outer diameter of the reinforcing ring are determined by numerical simulation calculation according to the diameter of the inner shell; the material of inner shell is red copper, and the material of shell and beaded finish is the stainless steel. The high-pressure water-cooling sealing structure is simple, easy to process and manufacture and capable of effectively prolonging the service life of the red copper inner shell.
Description
Technical Field
The invention belongs to the technical field of electric arc heaters, and particularly relates to a high-pressure water-cooling sealing structure for an electric arc heater.
Background
The electric arc heater is used for ground test research work of heat-proof materials and structures of the space craft, the temperature of high-temperature gas generated by adopting an electric arc discharge mode can reach 8000K, and the maximum total pressure can reach 15MPa. The device can provide high enthalpy and high pressure inflow which is continuous for a long time, and is mainly used for ground test research and evaluation and examination of materials and structures of a thermal protection system of a hypersonic aircraft, and flight systems such as a scramjet engine.
Because high-pressure water cooling is needed, an inner shell of the electric arc heater is made of red copper materials with high heat conductivity coefficients, an outer shell of the electric arc heater is made of stainless steel with high strength, the inner shell and the outer shell are arranged in a common assembly structure, and a sealing surface between the inner shell and the outer shell is sealed by an O-shaped rubber sealing ring.
The inner surfaces of the spray pipe inner shell, the electrode inner shell, the switching section inner shell and other parts in the arc heater form a high-temperature airflow channel, and gas flows through the high-temperature airflow channel to form high heat flow. The electric arc heater is provided with a high-pressure water cooling device, and the high-pressure water cooling device introduces high-pressure driving cooling water which generates high-speed flow on the outer surface of the inner shell to take away the heat of high heat flow in the high-temperature airflow channel.
The one-time operation process of the arc heater comprises the following steps: high-pressure cooling water is firstly introduced, the electric arc equipment operates, the inner shell is heated, the electric arc equipment stops operating after working for a period of time, and the high-pressure cooling water is shut down. The operation process is the same at every turn, and after repeated operation was crossed many times like this, the sealed face size of red copper inner shell can diminish, and clearance between the sealed face can the grow, leads to the sealing washer not to live the high-pressure cooling water, the condition of leaking appears, and the red copper inner shell is scrapped.
Disclosure of Invention
The invention aims to provide a high-pressure water-cooling sealing structure for an electric arc heater.
The invention relates to a high-pressure water-cooling sealing structure for an electric arc heater, which is characterized by comprising a cooling water cavity arranged in an inner shell and a reinforcing ring arranged on the end surface of the inner shell; the sealing ring is positioned in the annular groove of the outer shell and used for sealing the contact end surface of the inner shell and the outer shell; the method also comprises the step of spraying a NiCrAlY coating on the wall surface of the inner shell by adopting an ultrasonic flame spraying process;
the width range of the reinforcing ring is 5-8 mm, and the inner diameter and the outer diameter of the reinforcing ring are determined by numerical simulation calculation according to the diameter of the inner shell;
the material of inner shell be red copper, the material of shell and beaded finish is the stainless steel.
Furthermore, the thickness of the NiCrAlY coating is 0.2mm +/-0.05 mm, and the roughness is less than Ra3.2.
Furthermore, the sealing ring is an O-shaped fluororubber ring, and the size is GB/T3452.1-2005.
Further, the reinforcing rings are a series of concentric reinforcing rings with 1 or more than 1.
Furthermore, the material of the reinforcing ring is 304 stainless steel.
Furthermore, an interference fit is adopted between the reinforcing ring and the inner shell.
High heat flow flows through the inner shell, the airflow wall surface of the inner shell is heated seriously, although cooling water flows along the outer wall surface at a high speed to cool the inner shell, the temperature of the inner shell can still rise to 200-500 ℃, red copper can be annealed and softened under the condition, further the water pressure change of a cooling channel and the air pressure change of an airflow channel are caused, the repeated impact of an electric arc heater test on the red copper inner shell causes the obvious size change of the red copper inner shell, and the end surface size of the red copper inner shell is reduced and a sealing surface can not be sealed after a long time.
According to the high-pressure water-cooling sealing structure for the electric arc heater, after the stainless steel reinforcing ring is embedded into the end face of the red copper inner shell, the reinforcing ring is slightly influenced by temperature change, the outline dimension of the reinforcing ring is basically unchanged, the strength of the reinforcing ring is far higher than that of softened red copper, the material deformation of the red copper inner shell is limited, the dimension of the sealing surface of the red copper inner shell can be kept unchanged, and the service life of the red copper inner shell is prolonged.
The NiCrAlY coating in the high-pressure water-cooling sealing structure for the electric arc heater has the comprehensive strength of more than 50MPa, meets the requirement of the electric arc heater on test impact resistance, can effectively reduce the conduction of airflow heat to the red copper inner shell, protects the surface of the red copper inner shell, avoids the oxidation burning loss of the surface of the red copper inner shell, and prolongs the service life of the red copper inner shell.
The high-pressure water-cooling sealing structure for the electric arc heater is simple, easy to machine and manufacture and capable of effectively prolonging the service life of the red copper inner shell.
Drawings
FIG. 1 is a schematic view of a high pressure water-cooled sealing structure for an arc heater according to the present invention;
fig. 2 is a schematic view of a reinforcing ring structure in the high-pressure water-cooling sealing structure for the arc heater of the invention.
In the figure, 1, an outer shell 2, a sealing ring 3, a cooling water cavity 4, an inner shell 5, a reinforcing ring 6 and a NiCrAlY coating.
Detailed Description
The present invention is described in detail below with reference to the drawings and examples.
As shown in fig. 1, the high-pressure water-cooling sealing structure for the arc heater of the present invention comprises a cooling water chamber 3 provided inside an inner casing 4, a reinforcing ring 5 installed at an end surface of the inner casing 4; the sealing ring 2 is positioned in an annular groove of the outer shell 1 and used for sealing the contact end face of the inner shell 4 and the outer shell 1; the coating also comprises a NiCrAlY coating 6 sprayed on the wall surface of the inner shell 4 by adopting an ultrasonic flame spraying process;
as shown in fig. 2, the width of the reinforcing ring 5 ranges from 5mm to 8mm, and the inner diameter and the outer diameter of the reinforcing ring 5 are determined by numerical simulation calculation according to the diameter of the inner shell 4;
the material of inner shell 4 be red copper, the material of shell 1 and beaded finish 5 is the stainless steel.
Further, the thickness of the NiCrAlY coating 6 is 0.2mm +/-0.05 mm, and the roughness is less than Ra3.2.
Furthermore, the sealing ring 2 is an O-shaped fluororubber ring, and the size is GB/T3452.1-2005.
Further, the reinforcing ring 5 is a series of concentric reinforcing rings 5 with 1 or more than 1.
Furthermore, the material of the reinforcing ring 5 is 304 stainless steel.
Further, an interference fit is adopted between the reinforcing ring 5 and the inner shell 4.
Example 1
The diameter of the inner shell 4 in the high-pressure water-cooling sealing structure for the arc heater of the embodiment exceeds 200mm, the inner diameter of the reinforcing ring 5 is 180mm, the outer diameter is 196mm, the width of the reinforcing ring 5 is 8mm, and the temperature of high heat flow flowing through the inner shell 4 is higher than 6000K and the air pressure is 10MPa. At present, the high-pressure water-cooling sealing structure for the arc heater of the embodiment is still effective after 500 arc heater tests in 4 years.
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. It will be apparent to those skilled in the art that additional modifications and adaptations can be readily made thereto without departing from the principles of the invention, and it is therefore intended that the invention not be limited to the specific details and illustrations contained herein, except insofar as they are within the scope of the appended claims and their equivalents.
Claims (6)
1. A high-pressure water-cooling sealing structure for an electric arc heater is characterized by comprising a cooling water cavity (3) arranged in an inner shell (4) and a reinforcing ring (5) arranged on the end surface of the inner shell (4); comprises a sealing ring (2) which is positioned in an annular groove of an outer shell (1) and is used for sealing the contact end surface of an inner shell (4) and the outer shell (1); the coating is characterized by also comprising a NiCrAlY coating (6) sprayed on the wall surface of the inner shell (4) by adopting an ultrasonic flame spraying process;
the width range of the reinforcing ring (5) is 5-8 mm, and the inner diameter and the outer diameter of the reinforcing ring (5) are determined by numerical simulation calculation according to the diameter of the inner shell (4);
the inner shell (4) is made of red copper, and the outer shell (1) and the reinforcing ring (5) are made of stainless steel.
2. The high pressure water-cooled sealing structure for an arc heater as claimed in claim 1, wherein said NiCrAlY coating (6) has a thickness of 0.2mm ± 0.05mm and a roughness of less than ra3.2.
3. The high-pressure water-cooling sealing structure for the arc heater according to claim 1, wherein the sealing ring (2) is an O-shaped fluororubber ring with the size of GB/T3452.1-2005.
4. The high pressure water-cooled sealing structure for an arc heater according to claim 1, wherein the reinforcing ring (5) is a concentric series of 1 or more than 1 reinforcing ring (5).
5. The high-pressure water-cooling sealing structure for the arc heater as claimed in claim 1, wherein the material of the reinforcing ring (5) is 304 stainless steel.
6. The high pressure water-cooled sealing structure for the arc heater according to claim 1, wherein the reinforcing ring (5) is in interference fit with the inner shell (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110365923.7A CN113079604B (en) | 2021-04-06 | 2021-04-06 | High-pressure water-cooling sealing structure for electric arc heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110365923.7A CN113079604B (en) | 2021-04-06 | 2021-04-06 | High-pressure water-cooling sealing structure for electric arc heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113079604A CN113079604A (en) | 2021-07-06 |
| CN113079604B true CN113079604B (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110365923.7A Active CN113079604B (en) | 2021-04-06 | 2021-04-06 | High-pressure water-cooling sealing structure for electric arc heater |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB943793A (en) * | 1959-06-03 | 1963-12-04 | British Oxygen Co Ltd | Electric arc apparatus and processes |
| CN206212293U (en) * | 2016-10-31 | 2017-05-31 | 中国航天空气动力技术研究院 | One kind welding water cooled seal thermal protection struc ture |
| CN110712764A (en) * | 2019-10-21 | 2020-01-21 | 中国航天空气动力技术研究院 | Subsonic velocity envelope ablation test device used under high enthalpy condition |
-
2021
- 2021-04-06 CN CN202110365923.7A patent/CN113079604B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB943793A (en) * | 1959-06-03 | 1963-12-04 | British Oxygen Co Ltd | Electric arc apparatus and processes |
| CN206212293U (en) * | 2016-10-31 | 2017-05-31 | 中国航天空气动力技术研究院 | One kind welding water cooled seal thermal protection struc ture |
| CN110712764A (en) * | 2019-10-21 | 2020-01-21 | 中国航天空气动力技术研究院 | Subsonic velocity envelope ablation test device used under high enthalpy condition |
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| CN113079604A (en) | 2021-07-06 |
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