An arc heater arc wire installation device and arc heating equipment

Abstract

The present invention relates to an arc heater arc wire installation device and an arc heating device, belonging to the technical field of aerodynamic thermal ground simulation test of aerospace aircraft; the installation device includes an adapter nozzle, a ball head, a ball head nut, a connecting piece, an adjusting piece, a piston, a clamping nut clamping head and a clamping nut coaxially installed in sequence, and also includes an arc wire, which runs through the entire arc wire installation device. The arc wire installation device is connected to the outer surface of the installation flange of the arc heating equipment through the adapter nozzle, and the arc wire passes through the installation flange to contact the anode of the arc heater. The present invention solves the problems of the existing arc wire installation process being complicated and time-consuming, and has the advantages of easy operation, convenient installation, high arc striking success rate, good flow field purity, etc., thereby improving the test quality and efficiency. In addition, the present invention changes the original internal installation method of the arc wire to external installation, eliminating the tedious installation process, reducing manual labor, and reducing flow field pollution.

Description

Technical Field

[0001] The present invention relates to an arc heater arc starting installation, in particular to an arc heater arc starting wire installation device and an arc heating device, belonging to the technical field of aerospace aircraft aerodynamic thermal ground simulation test. Background Art

[0002] The main task of the arc heating test facility is to simulate the corresponding aerodynamic heating environment on the ground according to the needs of thermal protection research on different aircraft, and to evaluate or verify the protective materials and thermal structures.

[0003] my country's aircraft thermal protection aerodynamic heating test equipment mainly uses arc heaters to provide high-temperature gas. Figure 1 As shown, under normal pressure, before establishing a complete arc, an arc needs to be struck. An arc-strike wire is installed between the arc heater anode and the arc heater cathode to make the arc heater anode and the arc heater cathode conductive. The arc-strike wire is ignited by a high-voltage power supply to complete the arc-strike process, ionizing the gas entering the arc heater to form a plasma arc containing high temperature and high pressure, thus forming a complete arc. The existing arc-strike wire installation method is to turn on the arc heater before each test, install and fix an arc-strike wire of appropriate length on the anode end of the arc heater, and one person pushes the arc heater anode until the arc-strike wire hits the arc heater cathode, while another person tightens the arc heater. It should be noted that: an arc-strike wire that is too long or too short will affect the conductivity of the arc heater anode and the arc heater cathode, thereby determining the success of the arc-strike. The length of the arc-strike wire that ignites each time is approximately one-third of the installed arc-strike wire, and the remaining part either remains inside the arc heater or is blown out of the flow field with the airflow. Before the next test, open the arc heater, clean the remaining part of the arc wire after the explosion and any excess debris such as the plasticine used to secure the arc wire, and then install the arc wire for the next test. The entire installation process requires two people to ensure that the arc heater anode and arc heater cathode are coaxial and tightened. The explosion of the arc wire will leave welds on the end surfaces of the arc heater anode and arc heater cathode. When reinstalling the arc wire, the length of the arc wire needs to be adjusted appropriately. When the test state of the inlet air flow is large, the arc wire can easily be blown away by the introduced gas, resulting in unsuccessful arc initiation and the need to reinstall the arc wire. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide an arc heater arc wire installation device, which solves the problems of the existing arc wire installation process being complicated and time-consuming, and has the advantages of easy operation, convenient installation, high arc striking success rate, good flow field purity, etc., thereby improving the test quality and efficiency.

[0005] Another object of the present invention is to provide an arc heating device comprising the arc-starting wire installation device.

[0006] The above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

[0007] An arc heater arc wire installation device includes an adapter nozzle, a ball head, a ball head nut, a connecting piece, an adjusting piece, a piston, a clamping nut, a clamping head and a clamping nut coaxially installed in sequence, and also includes an arc wire. The arc wire enters from one end of the adapter nozzle or the clamping nut and exits from one end of the clamping nut or the adapter nozzle, passing through the entire arc wire installation device. The arc wire installation device is connected to the outer surface of the mounting flange of the arc heating equipment through the adapter nozzle, and the arc wire passes through the mounting flange and contacts the arc heater anode of the arc heating equipment.

[0008] The above-mentioned arc heater strike wire installation device further includes a sealing gasket, which is arranged between the adjusting member and the piston, with one end abutting against the groove of the piston and the other end penetrating into the groove of the adjusting member.

[0009] In the above-mentioned arc heater strike wire installation device, the cross-section of the sealing gasket along the axial direction is a combination of a rectangle and a trapezoid, the inner hole diameter of the sealing gasket is ±10% of the arc strike wire diameter, and the material is polyurethane.

[0010] The above-mentioned arc heater strike wire installation device further includes a sealing ring, which serves as a lateral sealing member and surrounds the outer surface of the piston.

[0011] In the above-mentioned arc heater arc wire installation device, a tapered hole is provided on one end face of the adapter nozzle, which is connected to one end of the ball head, the ball head nut is flexibly connected to the ball head, and the other end of the ball head is coaxially fixedly connected to the connecting piece.

[0012] In the above-mentioned arc heater arc wire installation device, the connecting part is a hollow cavity structure with one end open and the other end having an external hexagonal shape. The adjusting part, sealing gasket and piston are installed in the hollow cavity structure in sequence, and the clamping nut is connected to the connecting part by threaded matching.

[0013] In the above-mentioned arc heater strike wire installation device, the depth of the hollow cavity structure in the connecting piece is 5 to 8 mm less than the sum of the lengths of the adjusting piece, the sealing gasket and the piston.

[0014] In the above-mentioned arc heater strike wire installation device, the piston is made of nitrile rubber.

[0015] In the above-mentioned arc heater arc wire installation device, the circumferential surface of one side of the clamping nut is an external thread and has a conical inner cavity, which is threadedly connected to the clamping nut, and the other side has an external hexagonal shape and has an internal thread, which is threadedly connected to the connecting piece, and the material is brass.

[0016] In the above-mentioned arc heater strike wire installation device, the clamping head is provided with a clamping groove and both ends are cone heads, the clamping range is 0.8 to 1.5 mm, and the material is spring steel.

[0017] In the above-mentioned arc heater strike wire installation device, the strike wire has a roughness of no more than Ra3.2, a length passing through the clamping nut of 5 to 8 times the deflagration length, and is made of stainless spring steel wire.

[0018] An arc heating device comprises the above-mentioned arc striking wire installation device, an arc heater anode, a mounting flange, an arc heater cathode and an electrode connector, wherein the mounting flange is connected to the end face of one side of the electrode connector, the arc heater cathode passes through the through hole inside the mounting flange and is fixedly connected to one side of the electrode connector, the arc heater anode is fixedly connected to the other side of the electrode connector, and the arc striking wire of the arc striking wire installation device passes through the mounting flange and the electrode connector in sequence and contacts the arc heater anode.

[0019] In the above arc heating device, threaded holes are provided on both sides of the electrode connector, and the arc heater anode and the arc heater cathode are fixed to the electrode connector by screwing.

[0020] In the above-mentioned arc heating equipment, the end face of the arc heater anode is provided with a plurality of circumferentially arranged grooves, and the arc-starting wire passes through the mounting flange and the electrode connector in sequence, extends into one of the grooves on the end face of the arc heater anode and contacts the bottom of the groove; the arc heater anode and the arc heater cathode are coaxially installed, and the angle between the arc-starting wire and the axis is greater than 0° and less than 90°.

[0021] In the above-mentioned electric arc heating device, a plurality of oblique through holes are evenly distributed in the circumferential direction of the outer surface of the mounting flange, and the arc-starting wire passes through one of the through holes.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] (1) The embodiment of the present invention provides an arc heater arc wire installation device, which is different from the existing arc wire installation method. By optimizing the arc wire installation method from internal installation to external installation, and preferably clamping the arc wire, the effect of continuous use of one arc wire for multiple times is achieved. At the same time, the impurities remaining after the arc wire explodes are reduced, and the quality of the arc flow field is improved. The device only requires one person to complete the installation of the arc wire. The arc wire can be installed without turning on the arc heater. The operation is simple, and the test efficiency is improved. Under special large flow test conditions, the arc wire can also successfully complete the arcing operation.

[0024] (2) The embodiment of the present invention changes the original internal installation method of the arc-starting wire to external installation, eliminating the tedious installation process, reducing manual labor, and eliminating the need to use plasticine to fix the arc-starting wire on the anode end surface of the arc heater, thereby reducing flow field pollution.

[0025] (3) The embodiment of the present invention can achieve the effect of continuously feeding an arc-starting wire by clamping the arc-starting wire, without the need to accurately control the length of the arc-starting wire before each test. Not only can the arc-starting operation be completed smoothly, but the arc-starting success rate can also be improved under high-flow test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of arc-starting wire installation in the prior art;

[0027] Figure 2 This is a schematic diagram of the installation of the arc-starting wire in an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the structure of the arc heater arc wire installation device in an embodiment of the present invention;

[0029] Figure 4 This is a front view of the clamping head in an embodiment of the present invention;

[0030] 1-Arc heater anode; 2-Mounting flange; 3-Arc heater cathode; 4-Arc strike wire mounting device; 5-Electrode connector; 401-Adapter nozzle; 402-Ball head; 403-Ball head nut; 404-Connector; 405-Adjusting piece; 406-Sealing gasket; 407-Clamping nut; 408-Clamping head; 409-Pressure nut; 410-Sealing ring; 411-Piston; 412-Arc strike wire. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments:

[0032] like Figure 2As shown, the arc heating device of the present invention includes an arc heater anode 1, a mounting flange 2, an arc heater cathode 3, an arc-starting wire installation device 4 and an electrode connector 5. The arc-starting wire installation device 4 includes a switching nozzle 401, a ball head 402, a ball head nut 403, a connector 404, an adjusting member 405, a sealing gasket 406, a clamping nut 407, a clamping head 408, a pressing nut 409, a sealing ring 410, a piston 411 and an arc-starting wire 412, which is formed by the switching nozzle 401-ball head 402-ball head nut 403-connector 404-adjusting member 405-sealing gasket 406-piston 411-pressing nut The cap 409, the clamping head 408 and the clamping nut 407 are coaxially installed in sequence from one end to the other, and the sealing ring 410 is installed around the outer surface of the piston 411 as a lateral seal. The arc-starting wire 412 enters from one end of the adapter nozzle 401 or the clamping nut 407, and exits from one end of the clamping nut 407 or the adapter nozzle 401, passing through the entire arc-starting wire installation device 4. The arc-starting wire installation device 4 is externally placed on the circumferential surface of the mounting flange 2 through the adapter nozzle 401.

[0033] like Figure 2 As shown, threaded holes are provided on both sides of the electrode connector 5, the mounting flange 2 is connected to the end face of one side of the electrode connector 5, the arc heater cathode 3 passes through the through hole inside the mounting flange 2 and is screwed and fixed to one side of the electrode connector 5 by screws, the arc heater anode 1 is screwed and fixed to the other side of the electrode connector 5 by screws, and the end face of the arc heater anode 1 is provided with a plurality of annular grooves, the arc-starting wire 412 passes through the mounting flange 2 and the electrode connector 5 in sequence, extends into one of the grooves on the end face of the arc heater anode 1 and contacts the bottom of the groove, wherein the arc heater anode 1 and the arc heater cathode 3 are coaxially installed, and the arc-starting wire 412 forms a certain angle with the axis, which is greater than 0° and less than 90°. The annular groove design on the end face of the arc heater anode 1 allows the arc-starting wire 412 to contact different positions on the end face of the arc heater anode 1 as needed.

[0034] The outer surface of the mounting flange 2 is uniformly distributed along the circumference of a plurality of oblique elliptical through-holes. The arc-starting wire 412 passes through one of these through-holes, providing a direct access channel for the arc-starting wire 412 to the end face of the arc heater anode 1. The adapter nozzle 401 is welded to the mounting flange 2, and the entire assembly is at the same potential as the arc heater cathode 3.

[0035] like Figure 3 As shown, the adapter nozzle 401 of the arc heater's arc-starting wire installation device has a tapered hole on one end, which connects to one end of a ball head 402. A ball nut 403 is flexibly connected to the ball head 402, and the other end of the ball head 402 is coaxially welded to a connector 404. The ball head 402 and adapter nozzle 401 form a conical seal, and the entire device is threadedly connected to the adapter nozzle 401 via the ball nut 403, allowing for flexible installation.

[0036] Connector 404 is a hollow cavity structure with one end open and the other end having an external hexagonal shape. Adjustment member 405, sealing gasket 406, and piston 411 are sequentially installed within this hollow cavity structure. Compression nut 409 is threadedly connected to connector 404, with a clearance of 2-4 mm. In an alternative embodiment, the depth of the hollow cavity structure of connector 404 is less than the combined length of adjustment member 405, sealing gasket 406, and piston 411, which is 5-8 mm.

[0037] A positioning groove is provided on one side of the piston 411, and an O-ring 410 is installed on the side, and its material is preferably nitrile rubber.

[0038] The sealing gasket 406 is disposed between the adjusting member 405 and the piston 411, with one end abutting against the groove of the piston 411 and the other end extending into the groove of the adjusting member 405. In an optional embodiment, the cross-section of the sealing gasket 406 along the axial direction is a combination of a rectangle and a trapezoid. Preferably, the depth of the groove within the adjusting member 405 is greater than 30% of the height of the trapezoidal end of the sealing gasket 406. The inner diameter of the sealing gasket 406 is ±10% of the diameter of the arc-starting wire 412. The sealing gasket 406 has good compressibility and elasticity, is temperature-resistant above 80°C, and is preferably made of polyurethane. In this embodiment, a tapered hole is provided within the adjusting member 405 to cooperate with the sealing gasket 406. The sealing gasket 406 has a bullet-shaped shape. When the sealing gasket 406 is squeezed, the cone head of the sealing gasket 406 is subjected to force and gradually contracts toward the surface of the arc-starting wire 412, thereby sealing the gas passing through the surface of the arc-starting wire 412.

[0039] One side of the compression nut 409 has an external thread and a tapered inner cavity, which is threadedly connected to the clamping nut 407. The other side has an external hexagonal shape and an internal thread, which is threadedly connected to the connector 404. The compression nut 409 is preferably made of brass, a different material from the connector 404 and clamping nut 407, to prevent mechanical locking with the connector 404 and clamping nut 407 during frequent disassembly.

[0040] The clamping head 408 is provided with a slot and both ends are cone heads, the clamping range is 0.8 ~ 1.5mm, and different diameters of arc-starting wire 412 can be selected according to the test state of different flow rates. The cone head staggeredly cuts the strip holes but does not reach the bottom surface, such as Figure 4 As shown, the cone head has several slots, with adjacent slots in different directions (i.e. the first slot is from top to bottom, the second slot is from bottom to top), but none of them runs through the entire cone head to maintain structural strength and basic clamping performance. The material is preferably spring steel.

[0041] The arc-starting wire 412 has a smooth surface with a roughness of no more than Ra3.2. The length of the arc-starting wire 412 passing through the clamping nut 407 is 5-8 times the deflagration length, which is more conducive to the sealing gasket 406 sealing the airflow. Stainless steel spring wire is preferred.

[0042] The entire arc heating device of the present invention is welded to the mounting flange via an adapter nozzle and integrally mounted on the arc heater cathode. Prior to testing, the arc-starting wire runs through the entire device, with one end passing through the clamping nut and the other end resting on the anode end face of the arc heater. At this point, the arc heater anode and the arc heater cathode are electrically connected. The compression nut is tightened to the bottom of the thread. The piston, under the action of the compression nut, squeezes the sealing gasket, causing the sealing gasket to deform and contract toward the arc-starting wire surface to form a seal. The clamping nut is tightened, and the clamping head clamps the arc-starting wire. During the test, a high-voltage power supply causes the arc-starting wire to ignite, completing the arc-starting step. This ionizes the gas entering the arc heater to form a high-temperature, high-pressure plasma arc, thereby forming a complete arc. Before the next test, the clamping nut is loosened, followed by the compression nut. The remaining arc-starting wire is moved toward the arc heater anode until it rests on the anode end face of the arc heater. The previous arc-starting wire installation steps are repeated. This process is repeated until the remaining arc-starting wire is about to be submerged in the clamping nut and the remaining length is insufficient for the next arc-starting test, and then a new arc-starting wire can be replaced. The present invention can realize the external installation of the arc-starting wire and achieve "continuous" use of the arc-starting wire through a single arc-starting wire, which is simple to operate, has a high arc-starting success rate, and improves the quality and efficiency of the test.

[0043] The invention can be applied to the installation of an arc heater arc wire in an aerodynamic thermal ground simulation test of an aerospace vehicle.

[0044] The above description is only the best specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

[0045] The contents not described in detail in the specification of the present invention belong to the common knowledge of professionals in this field.

Claims

1. An arc heater arc wire installation device, characterized in that: The invention comprises a switching nozzle (401), a ball head (402), a ball head nut (403), a connecting piece (404), an adjusting piece (405), a piston (411), a pressing nut (409), a clamping head (408) and a clamping nut (407) which are coaxially installed in sequence, and also comprises an arc-starting wire (412). The arc-starting wire (412) penetrates from one end of the switching nozzle (401) or the clamping nut (407) and passes out from one end of the clamping nut (407) or the switching nozzle (401), and passes through the entire arc-starting wire installation device. The arc-starting wire installation device is connected to the outer surface of the mounting flange (2) of the arc heating device through the switching nozzle (401), and the arc-starting wire (412) passes through the mounting flange (2) and contacts the arc heater anode (1) of the arc heating device.

2. The arc heater arc wire installation device according to claim 1, characterized in that: It also includes a sealing gasket (406), which is arranged between the regulating member (405) and the piston (411), with one end of the sealing gasket abutting against the groove of the piston (411) and the other end deeply inserted into the groove of the regulating member (405).

3. The arc heater arc wire installation device according to claim 2, characterized in that: The cross-section of the sealing gasket (406) along the axial direction is a combination of a rectangle and a trapezoid. The inner hole diameter of the sealing gasket (406) is ±10% of the diameter of the arc-starting wire (412), and the material is polyurethane.

4. The arc heater arc wire installation device according to claim 1, characterized in that: The invention also comprises a sealing ring (410), which serves as a lateral sealing member and surrounds the outer surface of the piston (411).

5. The arc heater strike wire installation device according to claim 1, characterized in that: One end surface of the adapter nozzle (401) is provided with a tapered hole, which is connected to one end of the ball head (402). The ball head nut (403) is movably connected to the ball head (402), and the other end of the ball head (402) is coaxially fixedly connected to the connecting piece (404).

6. The arc heater strike wire installation device according to claim 1, characterized in that: The connecting piece (404) is a hollow cavity structure with one end open and the other end having an external hexagonal shape. The adjusting piece (405), the sealing gasket (406) and the piston (411) are sequentially installed in the hollow cavity structure. The pressing nut (409) is connected to the connecting piece (404) by threaded fitting.

7. The arc heater arc wire installation device according to claim 6, characterized in that: The depth of the hollow cavity structure of the connecting member (404) is 5 to 8 mm less than the sum of the lengths of the adjusting member (405), the sealing gasket (406) and the piston (411).

8. The arc heater strike wire installation device according to claim 1, characterized in that: The piston (411) is made of nitrile rubber.

9. The arc heater arc wire installation device according to claim 1, characterized in that: The compression nut (409) has an outer thread on one side and a tapered inner cavity, which is threadedly connected to the clamping nut (407), and an outer hexagonal shape on the other side and an inner thread, which is threadedly connected to the connector (404). The material is brass.

10. The arc heater strike wire installation device according to claim 1, characterized in that: The clamping head (408) is provided with a clamping slot and has cone heads at both ends, with a clamping range of 0.8 to 1.5 mm, and is made of spring steel.

11. The arc heater strike wire installation device according to claim 1, characterized in that: The arc-starting wire (412) has a roughness not greater than Ra3.2, a length passing through the clamping nut (407) that is 5 to 8 times the deflagration length, and is made of stainless spring steel wire.

12. An arc heating device, characterized in that: It comprises an arc-starting wire installation device (4) as described in any one of claims 1 to 11, an arc heater anode (1), a mounting flange (2), an arc heater cathode (3) and an electrode connector (5), wherein the mounting flange (2) is connected to the end face of one side of the electrode connector (5), the arc heater cathode (3) passes through the through hole inside the mounting flange (2) and is fixedly connected to one side of the electrode connector (5), the arc heater anode (1) is fixedly connected to the other side of the electrode connector (5), and the arc-starting wire (412) of the arc-starting wire installation device (4) passes through the mounting flange (2) and the electrode connector (5) in sequence and contacts the arc heater anode (1).

13. The arc heating device according to claim 12, characterized in that: Threaded holes are provided on both sides of the electrode connector (5), and the arc heater anode (1) and the arc heater cathode (3) are fixed to the electrode connector (5) by screwing.

14. The arc heating device according to claim 12, characterized in that: The end face of the arc heater anode (1) is provided with a plurality of circumferentially arranged grooves, and the arc-starting wire (412) passes through the mounting flange (2) and the electrode connector (5) in sequence, extends into one of the grooves on the end face of the arc heater anode (1) and contacts the bottom of the groove; the arc heater anode (1) and the arc heater cathode (3) are coaxially mounted, and the angle between the arc-starting wire (412) and the axis is greater than 0° and less than 90°.

15. The arc heating device according to claim 14, characterized in that: The outer surface of the mounting flange (2) is evenly distributed with a plurality of oblique through holes in the circumferential direction, and the arc-starting wire (412) passes through one of the through holes.

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