Vacuum connection of arcjet thruster to nozzle and method of use

Abstract

The present application belongs to the technical field of arc tunnel test, and discloses a vacuum connecting device for separating arc tunnel heater and nozzle and a using method thereof. The vacuum connecting device comprises, in sequence from front to back, an electrode outlet section of the arc heater, an adjusting flange, a vacuum gate valve and a nozzle connecting flange which are sealingly connected; and a vacuum connecting valve pipeline which is in communication with the vacuum gate valve and externally connected with a test section; the electrode outlet section and the nozzle connecting flange are both provided with sandwiched water cooling; the inner cylinder of the electrode outlet section moves forward and backward, the valve plate of the vacuum gate valve moves up and down, and the connection channel between the electrode outlet section and the nozzle connecting flange is switched on and off. The using method adjusts the distance between the electrode outlet section and the nozzle connecting flange, and uses the vacuum gate valve to realize the separation of the vacuum environment. The vacuum connecting device and the using method thereof can effectively reduce the damage of arc heater maintenance in the vacuum state to the arc tunnel vacuum, reduce the operation cost and improve the operation efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of arc tunnel test, and particularly relates to a vacuum connection device for separating an arc tunnel heater and a nozzle and a use method thereof. BACKGROUND

[0002] With the rapid development of hypersonic flight technology, the ground heat protection test of the hypersonic vehicle thermal protection system puts forward higher and higher requirements on the operation capacity of the arc heating equipment. The arc tunnel can simulate the thermal environment of the hypersonic vehicle flying at a high altitude, and realize the high-power, high-enthalpy and long-time test examination of the heat protection structure.

[0003] The arc tunnel is composed of an arc heater, a nozzle, a test section, a diffuser, a cooler and the like, and is matched with auxiliary systems such as a power supply system, a gas supply system, a water supply system, a vacuum system and a measurement and control system. The arc heater has many vulnerable parts, and the maintenance frequency is high. Each time of maintenance needs to close the gate valve on the vacuum pipeline, then the vacuum inside the tunnel body is balanced with the outside, and then the arc heater maintenance work is carried out. After the maintenance is completed, the environment inside the tunnel body is extracted to the required vacuum degree. The internal space of the arc tunnel of different power levels is from dozens of cubic meters to hundreds of cubic meters. The vacuum system pressure is greatly damaged each time the arc heater is maintained, and the vacuum maintenance cost also increases by tens of thousands of yuan.

[0004] At present, it is urgent to develop a vacuum connection device for separating an arc tunnel heater and a nozzle and a use method thereof. SUMMARY

[0005] One of the technical problems to be solved by the present application is to provide a vacuum connection device for separating an arc tunnel heater and a nozzle, and another technical problem to be solved by the present application is to provide a use method of the vacuum connection device for separating the arc tunnel heater and the nozzle, so as to meet the needs of rapid separation and recovery of the vacuum environment between the arc heater and the tunnel body.

[0006] The vacuum connection device for separating the arc tunnel heater and the nozzle comprises, in sequence from front to back, an electrode outlet section of the arc heater, an adjusting flange, a vacuum gate valve and a nozzle connecting flange; and further comprises a vacuum connection valve pipeline in communication with the vacuum gate valve, the vacuum connection valve pipeline being connected with the test section of the arc tunnel; the electrode outlet section and the nozzle connecting flange are both water-cooled.

[0007] The valve plate of the vacuum gate valve moves up and down, and the inner cylinder of the electrode outlet section moves forward and backward; the valve plate of the vacuum gate valve is located at the upper limit, and the inner cylinder of the electrode outlet section moves forward to open the connecting channel between the electrode outlet section and the nozzle connecting flange; the inner cylinder of the electrode outlet section moves backward, and the valve plate of the vacuum gate valve is located at the lower limit, thereby disconnecting the connecting channel between the electrode outlet section and the nozzle connecting flange.

[0008] The inner diameter D1 of the inner cylinder of the electrode outlet section is the same as the diameter of the nozzle connecting flange and the nozzle inlet, and the outer diameter D2 of the inner cylinder of the electrode outlet section is smaller than the pass diameter D3 of the vacuum gate valve.

[0009] Further, the length of the inner cylinder of the electrode outlet section is determined according to the actual thicknesses of the adjusting flange, the vacuum gate valve and the nozzle connecting flange.

[0010] Further, the electrode outlet section is a cylindrical sandwiched water-cooled structure, the inner shell is oxygen-free copper, the outer shell is stainless steel, and a water-separation cylinder is used to realize water inlet and outlet at one end; on the front end face of the inner cylinder, a flaky flange I for water cooling of the inner cavity connected with the electrode is arranged, and a water inlet and outlet channel is arranged on the flaky flange I; in the middle section of the inner cylinder, a movable sealing sleeve adjusting flange is arranged; at the rear end of the inner cylinder, the nozzle connecting flange is connected, and the rear end face is sealed.

[0011] Further, the adjusting flange is connected with the electrode outlet section, the vacuum gate valve and the nozzle connecting flange through bolts respectively.

[0012] The adjusting flange and the electrode outlet section are connected through a stud bolt, and the stud bolt is used to adjust the position between the adjusting flange and the electrode outlet section.

[0013] The adjusting flange and the vacuum gate valve are connected through a hexagonal head bolt I, and the hexagonal head bolt is used to realize connection positioning and connection sealing.

[0014] The adjusting flange and the nozzle connecting flange are connected through a hexagonal head bolt II, and the hexagonal head bolt II is used to enhance the structural strength of the vacuum connecting device, so as to meet the needs of high-pressure operation of the arc heater.

[0015] Further, the vacuum gate valve is a one-way sealing electric valve, and the sealing side is connected with the nozzle connecting flange; the vacuum gate valve realizes the on-off of the vacuum environment between the test section through a vacuum stop valve.

[0016] Further, the nozzle connecting flange is a flaky flange II with inner cavity water cooling, and the inner and outer shells are welded structures; the inner shell is oxygen-free copper, and the circumferential cooling water channel is double-sided sealing connection.

[0017] The use method of the vacuum connecting device of the separated arc wind tunnel heater and nozzle of the application comprises the following steps:

[0018] Electrode outlet section; adjusting flange; vacuum gate valve; nozzle connecting flange; vacuum connecting valve pipeline;

[0019] Before the arc tunnel runs, the valve plate of the vacuum gate valve is located at the upper limit; the double-end bolt is adjusted, the electrode outlet section is dragged to move backward by the arc heater dragging feeding device, the inner cylinder of the electrode outlet section passes through the vacuum gate valve and tightly seals the nozzle connecting flange, the connecting channel between the electrode outlet section and the nozzle connecting flange is opened, and the normal operation of the arc tunnel is ensured;

[0020] When the arc heater needs to be overhauled, first, the vacuum stop valve of the vacuum connecting valve pipeline is opened, the internal pressure of the valve body of the vacuum gate valve is balanced with the internal pressure of the arc heater; the double-end bolt is adjusted, the moving space of the electrode outlet section is released; the electrode outlet section is dragged to move forward by the arc heater dragging feeding device, the electrode outlet section is separated from the nozzle connecting flange, and the space required for the valve plate of the vacuum gate valve to fall and close is released; the valve plate of the vacuum gate valve falls to the lower limit, the connecting channel between the electrode outlet section and the nozzle connecting flange is disconnected, and the vacuum environment between the arc heater and the nozzle is cut off; the vacuum stop valve is closed, the gas supply pipeline of the arc heater is opened, and the vacuum pressure in the arc heater is released; the arc heater overhaul work is carried out;

[0021] After the arc heater is overhauled, the vacuum stop valve is opened, the internal vacuum environment of the arc heater is balanced with the internal vacuum environment of the arc tunnel; the valve plate of the vacuum gate valve rises to the upper limit, and the connecting channel between the electrode outlet section and the nozzle connecting flange is released; the double-end bolt is adjusted, the electrode outlet section is dragged to move backward by the arc heater dragging feeding device, the inner cylinder of the electrode outlet section passes through the vacuum gate valve and tightly seals the nozzle connecting flange, the connecting channel between the electrode outlet section and the nozzle connecting flange is opened, and the arc tunnel test is prepared.

[0022] The vacuum connecting device for separating the arc tunnel heater and the nozzle of the present application is located between the electrode outlet of the arc heater and the nozzle of the arc tunnel, and the use method of the vacuum connecting device for separating the arc tunnel heater and the nozzle of the present application uses the moving sealing function of the electrode outlet section, adjusts the distance between the electrode outlet section of the arc heater and the nozzle connecting flange, combines the use of the vacuum plug valve, quickly realizes the vacuum environment separation between the arc heater and the main body of the tunnel, reduces the influence on the pressure of the vacuum system of the arc tunnel, meets the frequent overhaul needs of the arc heater, reduces the operation cost of the arc tunnel, and improves the overhaul efficiency of the arc heater. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be described in detail below in combination with the drawings and examples.

[0024] Figure 1 It is an installation schematic diagram of the vacuum connecting device for separating the arc tunnel heater and the nozzle of the present application in the arc tunnel.

[0025] Figure 2 The vacuum connection device for separating the arc wind tunnel heater and the nozzle of the present invention (the gate valve is open);

[0026] Figure 3 The vacuum connection device for separating the arc wind tunnel heater and the nozzle of the present invention (gate valve closed state).

[0027] In the figure, 1. Electrode outlet section; 2. Adjustment flange; 3. Vacuum gate valve; 4. Nozzle connection flange; 5. Vacuum connection valve pipeline; 6. Arc heater; 7. Nozzle; 8. Test section bulkhead. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example 1: Figure 1 As shown, the vacuum connection device for separating the arc wind tunnel heater and the nozzle of this embodiment is used in an arc wind tunnel. The electrode outlet section 1 is sealedly connected to the electrode of the arc heater 6, the nozzle connection flange 4 is sealedly connected to the nozzle 7, and the vacuum connection valve pipeline 5 passes through the test section bulkhead 8 and is connected to the nozzle 7.

[0030] like Figure 2 、 Figure 3 As shown, the vacuum connection device for separating the arc wind tunnel heater and the nozzle of this embodiment includes an arc heater electrode outlet section 1, an adjustment flange 2, a vacuum gate valve 3, and a nozzle connection flange 4, which are sealed and connected in sequence from front to back. It also includes a vacuum connection valve pipeline 5 connected to the vacuum gate valve 3 and externally connected to the test section of the arc wind tunnel. The electrode outlet section 1 and the nozzle connection flange 4 are both cooled by interlayer water.

[0031] The valve plate of the vacuum gate valve 3 moves up and down, and the inner tube of the electrode outlet section 1 moves forward and backward; when the valve plate of the vacuum gate valve 3 is at the upper limit position, the inner tube of the electrode outlet section 1 moves forward, opening the connection channel between the electrode outlet section 1 and the nozzle connection flange 4; when the inner tube of the electrode outlet section 1 moves backward, the valve plate of the vacuum gate valve 3 is at the lower limit position, disconnecting the connection channel between the electrode outlet section 1 and the nozzle connection flange 4;

[0032] The inner diameter D1 of the inner cylinder of the electrode outlet section 1 is the same as the diameter of the nozzle connecting flange 4 and the nozzle inlet, and the outer diameter D2 of the inner cylinder of the electrode outlet section 1 is smaller than the diameter D3 of the vacuum gate valve 3.

[0033] Furthermore, the length of the inner cylinder of the electrode outlet section 1 is determined according to the actual thickness of the regulating flange 2 , the vacuum gate valve 3 and the nozzle connecting flange 4 .

[0034] Further, the electrode outlet section 1 is a cylindrical sandwich water cooling structure, the inner shell is oxygen-free copper, the outer shell is stainless steel, and a water cylinder is used to realize water inlet and outlet at one end; on the front end face of the inner cylinder, a flange I for water cooling of the inner cavity connected with the electrode is arranged, and a water inlet and outlet channel is arranged on the flange I; in the middle section of the inner cylinder, a movable sealing sleeve adjusting flange 2 is arranged; at the rear end of the inner cylinder, a flange 4 connected with the nozzle is connected, and the rear end face is sealed.

[0035] Further, the adjusting flange 2 is connected with the electrode outlet section 1, the vacuum gate valve 3 and the nozzle connecting flange 4 through bolts respectively.

[0036] The adjusting flange 2 and the electrode outlet section 1 are connected through a stud bolt, and the stud bolt is used to adjust the position between the adjusting flange 2 and the electrode outlet section 1.

[0037] The adjusting flange 2 and the vacuum gate valve 3 are connected through a hexagonal head bolt I, and the hexagonal head bolt is used to realize connection positioning and sealing.

[0038] The adjusting flange 2 and the nozzle connecting flange 4 are connected through a hexagonal head bolt II, and the hexagonal head bolt II is used to enhance the structural strength of the vacuum connection device, so as to meet the high pressure operation requirement of the arc heater.

[0039] Further, the vacuum gate valve 3 is an electrically driven one-way seal, and the sealing side is connected with the nozzle connecting flange 4; the vacuum gate valve 3 realizes the on-off of the vacuum environment between the test section through a vacuum stop valve.

[0040] Further, the nozzle connecting flange 4 is a flange II for water cooling of the inner cavity, and the inner and outer shells are welded structures, the inner shell is oxygen-free copper, the circumferential cooling water channel is double-sided sealing connection.

[0041] The use method of the vacuum connection device of the segmented arc wind tunnel heater and the nozzle in the embodiment comprises the following steps:

[0042] The electrode outlet section 1; the adjusting flange 2; the vacuum gate valve 3; the nozzle connecting flange 4; the vacuum connection valve pipeline 5;

[0043] Before the operation of the arc wind tunnel, the valve plate of the vacuum gate valve 3 is located at the upper limit position; the stud bolt is adjusted, the electrode outlet section 1 is dragged to move backward by the dragging device of the arc heater, the inner cylinder of the electrode outlet section 1 penetrates through the vacuum gate valve 3, tightly presses the nozzle connecting flange 4 and is sealed, the connecting channel between the electrode outlet section 1 and the nozzle connecting flange 4 is opened, and the normal operation of the arc wind tunnel is ensured.

[0044] When the electric arc heater needs to be overhauled, first open the vacuum stop valve of the vacuum connection valve pipeline 5, realize the internal pressure balance of the valve body of the vacuum gate valve 3 and the internal pressure of the electric arc heater, adjust the double-end bolt, release the electrode outlet section 1 moving space, the electric arc heater drives the electrode outlet section 1 to move forward, realize the separation of the electrode outlet section 1 and the nozzle connecting flange 4, and the space required for the valve plate of the vacuum gate valve 3 to fall and close is released, the valve plate of the vacuum gate valve 3 falls to the lower limit position, disconnects the connecting channel between the electrode outlet section 1 and the nozzle connecting flange 4, and isolates the vacuum environment between the electric arc heater and the nozzle, close the vacuum stop valve, open the electric arc heater gas supply pipeline, release the vacuum pressure in the electric arc heater, and carry out the electric arc heater overhaul work.

[0045] After the electric arc heater is overhauled, open the vacuum stop valve, realize the internal pressure balance of the electric arc heater and the electric arc tunnel, the valve plate of the vacuum gate valve 3 rises to the upper limit position, and the connecting channel between the electrode outlet section 1 and the nozzle connecting flange 4 is released, adjust the double-end bolt, the electric arc heater drives the electrode outlet section 1 to move backward, the inner cylinder of the electrode outlet section 1 passes through the vacuum gate valve 3 and tightly seals the nozzle connecting flange 4, opens the connecting channel between the electrode outlet section 1 and the nozzle connecting flange 4, and prepares for the electric arc tunnel test.

[0046] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, all the features disclosed by the present application, or the steps in all the methods or processes disclosed by the present application can be combined in any way, except for mutually exclusive features and / or steps, without departing from the principles of the present application, and the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A method for using a vacuum connection device for separating an arc wind tunnel heater and a nozzle, characterized in that: The method of use is used to separate a vacuum connection device of an arc wind tunnel heater from a nozzle, wherein the vacuum connection device comprises an electrode outlet section (1), an adjustment flange (2), a vacuum gate valve (3) and a nozzle connection flange (4) of the arc heater which are sequentially sealed and connected from front to back; and further comprises a vacuum connection valve pipeline (5) in communication with the vacuum gate valve (3), wherein the vacuum connection valve pipeline (5) is externally connected to a test section of the arc wind tunnel; the electrode outlet section (1) and the nozzle connection flange (4) are both cooled by interlayer water; The valve plate of the vacuum gate valve (3) moves up and down, and the inner cylinder of the electrode outlet section (1) moves forward and backward; the valve plate of the vacuum gate valve (3) is located at the upper limit position, the inner cylinder of the electrode outlet section (1) moves backward, and the connection channel between the electrode outlet section (1) and the nozzle connection flange (4) is opened; the inner cylinder of the electrode outlet section (1) moves forward, and the valve plate of the vacuum gate valve (3) is located at the lower limit position, and the connection channel between the electrode outlet section (1) and the nozzle connection flange (4) is disconnected; The inner diameter D1 of the inner cylinder of the electrode outlet section (1) is the same as the diameter of the nozzle connecting flange (4) and the nozzle inlet, and the outer diameter D2 of the inner cylinder of the electrode outlet section (1) is smaller than the diameter D3 of the vacuum gate valve (3); The method of use comprises the following steps: Electrode outlet section (1); regulating flange (2); vacuum gate valve (3); nozzle connecting flange (4); vacuum connecting valve pipeline (5); Before the arc wind tunnel is operated, the valve plate of the vacuum gate valve (3) is located at the upper limit position; the stud bolts are adjusted, and the arc heater dragging feeding device drags the electrode outlet section (1) to move backward, and the inner tube of the electrode outlet section (1) passes through the vacuum gate valve (3) to press against the nozzle connecting flange (4) and seal it, thereby opening the connection channel between the electrode outlet section (1) and the nozzle connecting flange (4) to ensure the normal operation of the arc wind tunnel; When the arc heater needs to be overhauled, first open the vacuum stop valve of the vacuum connecting valve pipeline (5) to achieve a balance between the internal pressure of the vacuum gate valve (3) valve body and the internal pressure of the arc heater; adjust the stud bolts to release the moving space of the electrode outlet section (1); the arc heater dragging feeding device drags the electrode outlet section (1) forward to separate the electrode outlet section (1) from the nozzle connecting flange (4), and free up the space required for the valve plate of the vacuum gate valve (3) to fall and close; the valve plate of the vacuum gate valve (3) falls to the lower limit position, disconnecting the connection channel between the electrode outlet section (1) and the nozzle connecting flange (4), and isolating the vacuum environment between the arc heater and the nozzle; close the vacuum stop valve, open the arc heater gas supply pipeline, and release the vacuum pressure in the arc heater; and carry out the overhaul of the arc heater; After the arc heater is overhauled, the vacuum shut-off valve is opened to achieve a balance between the arc heater and the vacuum environment inside the arc wind tunnel; the valve plate of the vacuum gate valve (3) rises to the upper limit position to clear the connection channel between the electrode outlet section (1) and the nozzle connection flange (4); the stud bolts are adjusted, and the arc heater dragging feeding device drags the electrode outlet section (1) backward, and the inner tube of the electrode outlet section (1) passes through the vacuum gate valve (3) to press against the nozzle connection flange (4) and seal it, opening the connection channel between the electrode outlet section (1) and the nozzle connection flange (4) to prepare for the arc wind tunnel test.

2. The method for using the vacuum connection device for separating an arc wind tunnel heater and a nozzle according to claim 1, characterized in that: The length of the inner cylinder of the electrode outlet section (1) is determined according to the actual thickness of the regulating flange (2), the vacuum gate valve (3) and the nozzle connecting flange (4).

3. The method for using the vacuum connection device for separating an arc wind tunnel heater and a nozzle according to claim 1, characterized in that: The electrode outlet section (1) is a cylindrical interlayer water-cooled structure, the inner shell is oxygen-free copper, the outer shell is stainless steel, and a water-blocking tube is used to realize water inlet and outlet at one end; at the front end face of the inner tube, a sheet flange I for inner cavity water cooling connected to the electrode is provided, and the sheet flange I is provided with water inlet and outlet channels; in the middle section of the inner tube, a movable sealing set adjustment flange (2) is provided; at the rear end of the inner tube, it is connected to the nozzle connection flange (4), and the rear end face is sealed.

4. The method for using the vacuum connection device for separating an arc wind tunnel heater and a nozzle according to claim 1, characterized in that: The regulating flange (2) is respectively connected to the electrode outlet section (1), the vacuum gate valve (3) and the nozzle connecting flange (4) through bolts; The adjusting flange (2) and the electrode outlet section (1) are connected by stud bolts, and the stud bolts are used to adjust the position between the adjusting flange (2) and the electrode outlet section (1); The regulating flange (2) and the vacuum gate valve (3) are connected by a hexagonal head bolt I, which is used to achieve connection positioning and connection sealing; The regulating flange (2) and the nozzle connecting flange (4) are connected by a hexagonal bolt II, which is used to enhance the structural strength of the vacuum connecting device to meet the high-pressure operation requirements of the arc heater.

5. The method for using the vacuum connection device for separating an arc wind tunnel heater and a nozzle according to claim 1, characterized in that: The vacuum gate valve (3) is an electric one-way seal, and the sealing side is connected to the nozzle connection flange (4); the vacuum gate valve (3) is connected and disconnected to the vacuum environment between the test section through the vacuum stop valve.

6. The method for using the vacuum connection device for separating an arc wind tunnel heater and a nozzle according to claim 1, characterized in that: The nozzle connection flange (4) is a sheet flange II with water cooling in the inner cavity, an inner and outer shell welded structure, the inner shell is oxygen-free copper, a cooling water channel surrounds the circumference, and is sealed on both sides.

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