CN213586355U - Excitation coil and arc heater comprising same - Google Patents
Excitation coil and arc heater comprising same Download PDFInfo
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- CN213586355U CN213586355U CN202022727279.7U CN202022727279U CN213586355U CN 213586355 U CN213586355 U CN 213586355U CN 202022727279 U CN202022727279 U CN 202022727279U CN 213586355 U CN213586355 U CN 213586355U
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Abstract
The utility model discloses an excitation coil and an electric arc heater comprising the same, which relate to the technical field of electromagnetism, and are characterized in that the diameter and the wall thickness of a solenoid are preset conditions; two filler neck, said two filler neck dispose at both ends of said solenoid separately and communicate with said solenoid; the solenoid can circulate cooling water through the filler neck, and the tangential magnetic field component is further enhanced because the coil is closer to the surface of the electrode in the form of the solenoid; when the number of layers of the solenoid is increased or current is increased, the arc root can rotate rapidly in the middle section of the inner wall of the electrode, and safety of the electrode is guaranteed.
Description
Technical Field
The utility model belongs to the technical field of the electromagnetism, in particular to excitation coil and contain its electric arc heater.
Background
The electric arc heater is aircraft heat-proof structure examination ground simulation test equipment and is used for simulating a thermal environment encountered by an aircraft during flight, the magnet exciting coil is an important component of the electric arc heater, the function of the magnet exciting coil is embodied in that a magnetic field is generated to push an electric arc root to rotate along the tangential direction of the inner wall surface of an electrode, local burning loss caused by the stay of the electric arc root is avoided, and meanwhile, one component of magnetic field force pushes the electric arc root along the axis of the electrode, so that electric arc keeps a certain length.
In the development process of novel aircrafts, the requirement on high-power aerodynamic thermal ground simulation test equipment is more and more urgent. The electric arc heater used before China uses a pancake coil, the coil is wound outwards layer by taking an electrode axis as an axis and taking the outer surface of an electrode as a starting point, one wound unit is called as the pancake coil, a plurality of pancake coils are arranged along the direction of the electrode axis to form the pancake coil, and the axial component force of the coil is greater than the tangential component force; the structure of the pie coil enables the outer coil to be far away from the surface of the electrode, and the magnetic field force acting on the arc root of the electric arc is weakened; when the coil cake number is increased or the current is increased, the component force for pushing the arc root to move along the axial direction is obviously strengthened, and the arc root is pushed to one end of the electrode.
In a high-power arc heater, an arc root is pushed to one end of an electrode by a pie-shaped coil and slowly rotates, so that the electrode is easily burnt.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an excitation coil, when increasing the electric current during operation, the guarantee electrode safety.
In order to achieve the above object, according to an aspect of the present invention, the following technical solutions are provided:
the exciting coil includes:
the diameter and the pipe wall thickness of the solenoid are set in preset conditions;
two filler neck, said two filler neck dispose at both ends of said solenoid separately and communicate with said solenoid;
the solenoid may circulate cooling water through the filler neck.
Further, the preset condition is determined by the magnitude of the current and the magnitude of the flow of the cooling water.
Further, the solenoid is wound by at least one layer of copper tubes.
Further, terminal plates are provided at both ends of the solenoid, respectively.
Further, the wiring board is made of red copper and is fixedly connected with the solenoid.
Further, the outer surface of the solenoid is uniformly covered with an insulating layer.
Further, the inner diameter of the filler neck is larger than the outer diameter of the red copper pipe.
Further, the filler neck is made of stainless steel.
Furthermore, the wiring board is provided with a positioning hole and a threaded blind hole, the positioning hole is used for fixing the excitation coil, and the threaded blind hole is used for connecting a cable.
According to another aspect of the present invention, there is provided an arc heater including the exciting coil described above.
The utility model discloses at least, include following beneficial effect:
the magnetic field coil adopts a solenoid and can continuously cool the solenoid, so that most magnetic lines of force of a magnetic field generated by the magnetic field coil penetrate through the magnetic field coil in parallel, and the magnetic field force generated by the magnetic field coil and the electric arc acts on the magnetic field coil to push the electric arc root to rotate along the tangential direction has larger component force and push the electric arc root to move axially has smaller component force, thereby being beneficial to the electric arc root to rotate quickly at the safe position of the inner wall surface of the electrode; the tangential magnetic field component is further strengthened due to the fact that the solenoid form enables the coil to be closer to the surface of the electrode; when the number of layers of the solenoid is increased or current is increased, the arc root can rotate rapidly in the middle section of the inner wall of the electrode, and safety of the electrode is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a field coil according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a solenoid according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a filler neck in accordance with an embodiment of the present invention;
fig. 4 is a cross-sectional view of a wiring board according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the advantages of the technical solution of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, an embodiment of the present invention provides a field coil, where the field coil includes:
the diameter and the pipe wall thickness of the solenoid 1 are set in preset conditions;
two filler neck 2, said two filler neck 2 dispose in both ends of said solenoid 1 separately and communicate with said solenoid 1;
the solenoid 1 can circulate cooling water through the filler neck 2.
Specifically, the preset condition is determined by the magnitude of the current and the magnitude of the cooling water flow, the two filler pipes 2 are respectively arranged at two ends of the solenoid 1 and are communicated with the solenoid 1, one end of one of the filler pipes 2 is communicated with the solenoid 1, and the other end can be connected with a water source (for example, a high-pressure water pipe), when the solenoid is operated, the cooling water enters the solenoid 1 through the filler pipe 2 to cool the solenoid 1, so that the solenoid 1 is prevented from being burnt due to heat generation; the current forms the magnetic field through the solenoid 1 under the cooling state, exert the magnetic field force to the electric arc, a component of the magnetic field force promotes the electric arc to rotate along the tangential direction, another component promotes the electric arc to move along the axial direction, because the utility model discloses a most magnetic force lines of the magnetic field that the excitation coil produced are passed in parallel inside the excitation coil, therefore the magnetic field force that produces with the electric arc effect promotes the electric arc root to rotate along the tangential direction the component is bigger, the component that promotes the electric arc root to move axially is smaller, do benefit to the electric arc root to rotate fast in the electrode internal wall face safe position, and because the form of the solenoid 1 makes the coil more press close to the electrode surface, the tangential magnetic; when the number of layers of the solenoid is increased or current is increased, the arc root can rotate rapidly in the middle section of the inner wall of the electrode, and safety of the electrode is guaranteed.
As a further improvement of the present invention, the excitation coil further includes two wiring boards 3, the two wiring boards 3 are respectively disposed at both ends of the solenoid 1, so that the connection cable is convenient, and the current enters the solenoid 1 through the wiring board 3 to work.
As a further improvement, the solenoid 1 is formed by the copper tube coiling, can the coiling one deck, also can the coiling multilayer, specifically can be according to the number of piles to the demand determination coiling of magnetic field intensity.
It should be noted that the material of the nozzle 2 is suitable for welding with the solenoid 1, and the structure is suitable for sealing connection with the high pressure water pipe, specifically, the nozzle 2 may be a horn-shaped interface suitable for sealing connection with the cold source, and the nozzle may be made of stainless steel or red copper.
It should be noted that the conductor of the terminal block 3 may be made of red copper material, for example, and is connected to the solenoid 1, and the connection manner is not limited herein, and may be fixed (for example, by welding) or detachable (for example, by snap-fitting).
As a further improvement of the present invention, the outer surface of the solenoid 1 is uniformly covered with an insulating layer, specifically, in this embodiment, the solenoid may be annealed before winding, and after welding with the wiring board, the outer surface of the solenoid 1 is uniformly wound with insulating paper as an insulating layer, with a thickness of 0.5-1.5 mm; after winding, the solenoid wound with the insulating paper is tightly wound by a gauze belt, the whole coil is soaked with insulating paint for 3 times, and the coil is dried after being soaked with the insulating paint every time.
As a further improvement of the utility model, filler pipe 2 internal diameter be greater than solenoid 1 external diameter, so that filler pipe 2 with solenoid 1 pegs graft and welds.
As a further improvement of the present invention, the wiring board 3 has a positioning hole 31 and a threaded blind hole 32, the positioning hole 31 is used for fixing the solenoid 1, and the threaded blind hole 32 is used for connecting a cable.
The utility model also provides an electric arc heater, electric arc heater includes foretell excitation coil.
As shown in fig. 2, the embodiment of the present invention provides a solenoid 2;
the solenoid 2 is formed by winding a copper tube, and can be wound by one layer or multiple layers according to the requirement on the magnetic field intensity.
It should be noted that the solenoid diameter and wall thickness can be determined by the current magnitude and the cooling water flow rate.
It is further noted that the outer surface of the solenoid may be covered with an insulating material.
Specifically, in this embodiment, the solenoid 2 is formed by winding a T2 copper tube, for example, the magnetic induction intensity of the center position of the excitation coil needs to be 0.1-0.3T, and it is determined that the copper tube is wound by one layer through calculation.
Specifically, in this embodiment, for example, the exciting coil needs to pass a maximum current of 5000A, the cooling water flow rate is 500g/s, the temperature is allowed to rise by 50 ℃, and the diameter of the solenoid is calculated to be 10mm and the wall thickness is calculated to be 1 mm.
Specifically, in the embodiment, the red copper tube can be annealed before winding, and the DMD insulating paper can be uniformly wound outside the red copper tube, wherein the thickness of the DMD insulating paper is 1 mm; after winding, winding the coil tightly by a gauze belt; and (4) immersing the whole coil in insulating paint for 3 times, and drying the coil after each immersion.
When the device works, cooling water enters the copper tube 1 through the filler neck 2 to cool the copper tube 1, so that the copper tube is prevented from being burnt due to heating; the electric current forms the magnetic field through the copper tube under the cooling state, exert the magnetic field force to the electric arc, a component of the magnetic field force promotes the electric arc to rotate along the tangential direction, another component promotes the electric arc to move along the axial direction, because the utility model discloses a most magnetic force lines of the magnetic field that the excitation coil produced pass in parallel inside the excitation coil, therefore the magnetic field force that produces with the electric arc effect promotes the electric arc root to rotate along the tangential direction component is great, the component that promotes the electric arc root to move axially is less, do benefit to the electric arc root to rotate fast in the electrode internal wall face safe position, and because the use of the copper tube in the excitation coil, make the coil press close to the electrode surface more, the tangential magnetic; when the number of layers of the copper tube is increased or current is increased, the arc root can rotate fast at the middle section of the inner wall of the electrode, and the safety of the electrode is guaranteed.
In one embodiment of the invention, as shown in fig. 3, the filler neck 3 is in the form of a typical high-pressure welding filler neck.
It should be noted that the filler neck is made of a material that facilitates welding with the solenoid, for example, the filler neck may be made of stainless steel or copper.
In particular, the filler neck inner diameter is larger than the solenoid outer diameter to facilitate the insertion and welding of the filler neck and the solenoid.
It should be noted that the filler neck structure should be convenient for the sealed connection with the high-pressure water pipe.
Specifically, in the embodiment, the filler neck adopts a bell mouth structure to be connected with the high-pressure water pipe in a sealing manner, and in the embodiment, the inner diameter of the filler neck is 12.5mm and is 12mm larger than the outer diameter of the copper pipe, so that the filler neck is convenient to insert and weld.
As shown in fig. 4, in an embodiment of the present invention, the conductor of the wiring board 3 may be made of red copper, and is fixedly connected to the solenoid made of red copper.
It should be noted that the cross-sectional area of the terminal block should allow operation for long periods of time with operating current, with a temperature rise not exceeding 100 ℃.
It should be noted that, the wiring board has locating hole and screw thread blind hole, is convenient for fixed excitation coil and connection cable.
Specifically, in this example, the terminal plate is 150mm long, 50mm wide, 30mm thick, and is heated to 20 ℃ for 100 seconds by passing a current of 5000A.
Specifically, in this embodiment, the terminal plate has a fitting hole with a 12mm diameter to be fitted to the solenoid and welded thereto.
When the magnet exciting coil works, cooling water enters the copper tube through the pipe connecting nozzle to cool the copper tube, so that the copper tube is prevented from being burnt due to heating; the electric current forms the magnetic field through the copper tube under the cooling state, exert the magnetic field force to the electric arc, a component of the magnetic field force promotes the electric arc to rotate along the tangential direction, another component promotes the electric arc to move along the axial direction, because the utility model discloses a most magnetic force lines of the magnetic field that the excitation coil produced pass in parallel inside the excitation coil, therefore the magnetic field force that produces with the electric arc effect promotes the electric arc root to rotate along the tangential direction the component is bigger, the component that promotes the electric arc root to move axially is smaller, do benefit to the electric arc root to rotate fast in the electrode internal wall face safe position, and because the solenoid form makes the coil press close to the electrode surface more, the tangential magnetic field component; when the number of layers of the solenoid is increased or current is increased, the arc root can rotate rapidly in the middle section of the inner wall of the electrode, and the excitation coil can run safely and stably under the working condition of the maximum arc current 5000A. When the current is 5000A, the magnetic induction intensity at the axis position of the coil is 0.5T, and the generated magnetic field force enables the arc root to rotate rapidly in the middle of the electrode, so that the safety of the electrode is guaranteed.
The utility model discloses can be applied to aircraft heat protection structure examination ground simulation technical field.
While the embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in all kinds of fields suitable for the invention, and further modifications may readily be made by those skilled in the art, and the invention is thus not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined by the claims and their equivalents.
Claims (10)
1. An excitation coil, comprising:
the diameter and the pipe wall thickness of the solenoid are set in preset conditions;
two filler neck, said two filler neck dispose at both ends of said solenoid separately and communicate with said solenoid;
the solenoid may circulate cooling water through the filler neck.
2. The field coil according to claim 1, wherein the preset condition is determined by a magnitude of the current and a magnitude of the flow rate of the cooling water.
3. An excitation coil according to claim 1, wherein the solenoid is wound from copper tubing in at least one layer.
4. An excitation coil according to claim 1, wherein terminal plates are provided respectively at both ends of the solenoid.
5. The excitation coil of claim 4 wherein the terminal plate is made of copper and is fixedly connected to the solenoid.
6. A field coil according to any of claims 1 to 5, wherein the outer surface of the solenoid is uniformly covered with an insulating layer.
7. A field coil according to any one of claims 1 to 5, wherein the filler neck inner diameter is larger than the copper pipe outer diameter.
8. A field coil according to any of claims 1-5, characterized in that the filler neck is made of stainless steel.
9. A field coil according to claim 4, wherein the terminal block has a positioning hole for fixing the solenoid and a blind threaded hole for connecting a cable.
10. An arc heater comprising the field coil of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022727279.7U CN213586355U (en) | 2020-11-23 | 2020-11-23 | Excitation coil and arc heater comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022727279.7U CN213586355U (en) | 2020-11-23 | 2020-11-23 | Excitation coil and arc heater comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN213586355U true CN213586355U (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022727279.7U Active CN213586355U (en) | 2020-11-23 | 2020-11-23 | Excitation coil and arc heater comprising same |
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| CN (1) | CN213586355U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112312604A (en) * | 2020-11-23 | 2021-02-02 | 中国航天空气动力技术研究院 | Excitation coil |
| CN114245557B (en) * | 2021-12-24 | 2024-03-19 | 中国航天空气动力技术研究院 | System and method for measuring arc root current density of plasma generator |
-
2020
- 2020-11-23 CN CN202022727279.7U patent/CN213586355U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112312604A (en) * | 2020-11-23 | 2021-02-02 | 中国航天空气动力技术研究院 | Excitation coil |
| CN114245557B (en) * | 2021-12-24 | 2024-03-19 | 中国航天空气动力技术研究院 | System and method for measuring arc root current density of plasma generator |
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