Vacuum connecting device for separating electric arc wind tunnel heater from spray pipe and using method of vacuum connecting device

Abstract

The invention belongs to the technical field of arc wind tunnel tests, and discloses a vacuum connecting device for separating an arc wind tunnel heater and a spray pipe and a using method thereof. The vacuum connecting device comprises an electrode outlet section of the arc heater, an adjusting flange, a vacuum gate valve and a spray pipe connecting flange which are hermetically connected in sequence from front to back; the vacuum connection valve pipeline is communicated with the vacuum gate valve and is externally connected with a test section; the electrode outlet section and the spray pipe connecting flange adopt interlayer water cooling; the inner cylinder of the electrode outlet section moves back and forth, the valve plate of the vacuum gate valve moves up and down, and a connecting channel between the electrode outlet section and the spray pipe connecting flange is switched on and off. According to the using method, the distance between the electrode outlet section and the spray pipe connecting flange is adjusted, and the vacuum gate valve is used for achieving partition of the vacuum environment. The vacuum connecting device and the using method thereof can effectively reduce the damage of arc heater maintenance to arc wind tunnel vacuum in a vacuum state, reduce the operation cost and improve the operation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of arc wind tunnel testing, and in particular relates to a vacuum connection device for separating an arc wind tunnel heater and a nozzle, and a use method thereof. Background Art

[0002] With the rapid development of hypersonic flight technology, the ground heat protection test and assessment of the thermal protection system of hypersonic aircraft has put forward higher and higher requirements on the operating capability of arc heating equipment. The arc wind tunnel can simulate the thermal environment of hypersonic aircraft flying at a higher altitude and realize high-power, high-enthalpy and long-term test and assessment of heat protection structure.

[0003] The arc wind tunnel is composed of arc heater, nozzle, test section, diffuser, cooler and other main body sections, and supporting auxiliary systems such as power supply system, air supply system, water supply system, vacuum system and measurement and control system. The arc heater has many wearing parts and needs to be inspected and maintained frequently. Each inspection requires closing the gate valve on the vacuum pipeline, and then balancing the vacuum inside the wind tunnel body with the outside world before carrying out the inspection of the arc heater. After the inspection is completed, the internal environment of the wind tunnel body is evacuated to the required vacuum degree. The internal space of the arc wind tunnel body of different power levels ranges from tens of cubic meters to hundreds of cubic meters. Each inspection of the arc heater will cause great damage to the pressure of the vacuum system, and the cost of vacuum maintenance will also increase by tens of thousands of yuan.

[0004] Currently, there is an urgent need to develop a vacuum connection device for separating an arc wind tunnel heater from a nozzle and a method for using the same. Summary of the invention

[0005] One technical problem to be solved by the present invention is to provide a vacuum connection device for separating an arc wind tunnel heater from a nozzle. Another technical problem to be solved by the present invention is to provide a method for using the vacuum connection device for separating an arc wind tunnel heater from a nozzle, so as to meet the requirements of rapid isolation and recovery of the vacuum environment between the arc heater and the wind tunnel body. The vacuum connection device for separating an arc wind tunnel heater from a nozzle of the present invention comprises an electrode outlet section of the arc heater, an adjustment flange, a vacuum gate valve and a nozzle connection flange which are sequentially sealed and connected from front to back; and also comprises a vacuum connection valve pipeline connected to the vacuum gate valve, the vacuum connection valve pipeline being externally connected to a test section of the arc wind tunnel; the electrode outlet section and the nozzle connection flange are both cooled by interlayer water; 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 position, the inner cylinder of the electrode outlet section moves forward, and the connection channel between the electrode outlet section and the nozzle connection flange is opened; 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 position, and the connection channel between the electrode outlet section and the nozzle connection flange is disconnected; The inner diameter D1 of the inner cylinder of the electrode outlet section is the same as the nozzle connection flange and the nozzle inlet diameter, and the outer diameter D2 of the inner cylinder of the electrode outlet section is smaller than the diameter D3 of the vacuum gate valve.

[0006] Furthermore, the length of the inner tube of the electrode outlet section is determined according to the actual thickness of the regulating flange, the vacuum gate valve and the nozzle connecting flange.

[0007] Furthermore, the electrode outlet section 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 achieve water inlet and outlet at one end; on the front end face of the inner tube, there is a sheet flange I for inner cavity water cooling connected to the electrode, and the sheet flange I is provided with water inlet and outlet channels; in the middle section of the inner tube, the sealing set is movable to adjust the flange; at the rear end of the inner tube, it is connected to the nozzle connecting flange, and the rear end face is sealed.

[0008] Furthermore, the regulating flange is respectively connected to the electrode outlet section, the vacuum gate valve and the nozzle connecting flange by bolts; The adjusting flange and the electrode outlet section are connected by stud bolts, and the stud bolts are used to adjust the position between the adjusting flange and the electrode outlet section; The regulating flange and the vacuum gate valve are connected by hexagonal bolts Ⅰ, which are used to achieve connection positioning and connection sealing; The adjusting flange and the nozzle connecting flange 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.

[0009] Furthermore, the vacuum gate valve is an electric one-way seal, and the sealing side is connected to the nozzle connection flange; the vacuum gate valve is connected and disconnected with the vacuum environment between the test section through the vacuum stop valve.

[0010] Furthermore, the nozzle connection flange is a sheet flange II with water cooling in the inner cavity, an inner and outer shell welding structure, the inner shell is oxygen-free copper, a circumferential cooling water channel, and a double-sided sealed connection.

[0011] The method for using the vacuum connection device for separating an arc wind tunnel heater and a nozzle of the present invention comprises the following steps: Electrode outlet section; regulating flange; vacuum gate valve; nozzle connecting flange; vacuum connecting valve pipeline; Before the operation of the arc wind tunnel, the valve plate of the vacuum gate valve is located at the upper limit; the stud bolts are adjusted, the arc heater drags the electrode outlet section to move backwards, the inner tube of the electrode outlet section passes through the vacuum gate valve to press against the nozzle connection flange and seal it, and the connection channel between the electrode outlet section and the nozzle connection flange is opened 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 to balance the internal pressure of the vacuum gate valve body and the internal pressure of the arc heater; adjust the stud bolts to release the moving space of the electrode outlet section; the arc heater drags the electrode outlet section forward with the feeding device to separate the electrode outlet section from the nozzle connecting flange, and frees up the space required for the valve plate of the vacuum gate valve to fall and close; the valve plate of the vacuum gate valve falls to the lower limit, disconnects the connection channel between the electrode outlet section and the nozzle connecting flange, and isolates the vacuum environment between the arc heater and the nozzle; closes the vacuum stop valve, opens the arc heater gas supply pipeline, and releases the vacuum pressure in the arc heater; and carries out the overhaul of the arc heater; After the arc heater is overhauled, open the vacuum stop valve 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 rises to the upper limit to make way for the connection channel between the electrode outlet section and the nozzle connecting flange; adjust the stud bolts, and the arc heater dragging and feeding device drags the electrode outlet section backward. The inner tube of the electrode outlet section passes through the vacuum gate valve to press against the nozzle connecting flange and seal it, and the connection channel between the electrode outlet section and the nozzle connecting flange is opened to prepare for the arc wind tunnel test.

[0012] The vacuum connecting device for separating the arc wind tunnel heater and the nozzle of the present invention is located between the electrode outlet of the arc heater and the nozzle of the arc wind tunnel. The method for using the vacuum connecting device for separating the arc wind tunnel heater and the nozzle of the present invention utilizes the mobile sealing function of the electrode outlet section, adjusts the distance between the electrode outlet section of the arc heater and the nozzle connecting flange, and uses the vacuum gate valve in combination to quickly realize the vacuum environment isolation between the arc heater and the wind tunnel body, reduce the impact on the pressure of the vacuum system of the arc wind tunnel, meet the needs of frequent maintenance of the arc heater, reduce the operating cost of the arc wind tunnel, and improve the maintenance efficiency of the arc heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of installing the vacuum connection device for separating the arc wind tunnel heater and the nozzle of the present invention in the arc wind tunnel; Figure 2 The vacuum connection device for separating the arc wind tunnel heater and the nozzle of the present invention (the gate valve is in the open state); Figure 3 The invention discloses a vacuum connection device for separating an arc wind tunnel heater from a nozzle (the gate valve is closed).

[0015] In the figure, 1. electrode outlet section; 2. adjusting flange; 3. vacuum gate valve; 4. nozzle connecting flange; 5. vacuum connecting valve pipeline; 6. arc heater; 7. nozzle; 8. test section bulkhead. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0017] 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 for an arc wind tunnel, the electrode outlet section 1 is sealed and connected to the electrode of the arc heater 6, the nozzle connection flange 4 is sealed and 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.

[0018] like Figure 2 , Figure 3 As shown, the vacuum connection device for separating the arc wind tunnel heater and the nozzle of this embodiment comprises an electrode outlet section 1 of the arc heater, 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 comprises a vacuum connection valve pipeline 5 which is connected to the vacuum gate valve 3, and the vacuum connection valve pipeline 5 is 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; 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; the valve plate of the vacuum gate valve 3 is located at the upper limit position, and 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; the inner tube of the electrode outlet section 1 moves backward, and the valve plate of the vacuum gate valve 3 is located at the lower limit position, disconnecting the connection channel between the electrode outlet section 1 and the nozzle connection flange 4; 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 .

[0019] Furthermore, the inner tube length 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 .

[0020] Furthermore, 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; on the front end face of the inner tube, there is a sheet flange I for inner cavity water cooling connected to the electrode, and the sheet flange I is provided with water inlet and outlet channels; in the middle section of the inner tube, the sealing set adjustment flange 2 is movable; at the rear end of the inner tube, it is connected to the nozzle connection flange 4, and the rear end face is sealed.

[0021] Furthermore, the regulating flange 2 is respectively connected to the electrode outlet section 1, the vacuum gate valve 3 and the nozzle connecting flange 4 by 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 hexagonal bolts Ⅰ, and the hexagonal bolts are used to achieve connection positioning and connection sealing; The adjusting 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.

[0022] Furthermore, the vacuum gate valve 3 is an electric one-way seal, and the sealing side is connected to the nozzle connecting flange 4; the vacuum gate valve 3 is connected and disconnected with the vacuum environment between the test section through the vacuum stop valve.

[0023] Furthermore, the nozzle connecting flange 4 is a sheet flange II with water cooling in the inner cavity, an inner and outer shell welding structure, the inner shell is oxygen-free copper, a cooling water channel surrounds the circumference, and is sealed on both sides.

[0024] The method for using the vacuum connection device for separating the arc wind tunnel heater and the nozzle of this embodiment 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 operation of the arc wind tunnel, the valve plate of the vacuum gate valve 3 is located at the upper limit; the stud bolts are adjusted, and the arc heater drags the electrode outlet section 1 to move backwards, 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, and the connection channel between the electrode outlet section 1 and the nozzle connection flange 4 is opened 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 balance the internal pressure of the vacuum gate valve 3 valve body with 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 drags the electrode outlet section 1 forward to separate the electrode outlet section 1 from the nozzle connecting flange 4, and frees 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, disconnects the connection channel between the electrode outlet section 1 and the nozzle connecting flange 4, and isolates the vacuum environment between the arc heater and the nozzle; closes the vacuum stop valve, opens the arc heater gas supply pipeline, and releases the vacuum pressure in the arc heater; and carries out the overhaul of the arc heater; After the arc heater is overhauled, open the vacuum stop valve 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 to make way for the connection channel between the electrode outlet section 1 and the nozzle connecting flange 4; adjust the stud bolts, and the arc heater dragging and feeding device drags the electrode outlet section 1 backward. 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, and the connection channel between the electrode outlet section 1 and the nozzle connecting flange 4 is opened to prepare for the arc wind tunnel test.

[0025] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. For those familiar with the art, all features disclosed in the present invention, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A vacuum connection device for separating an arc wind tunnel heater from a nozzle, characterized in that: 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 an arc heater which are sequentially sealed and connected from front to back; it also comprises a vacuum connection valve pipeline (5) which is connected to the vacuum gate valve (3), and the vacuum connection valve pipeline (5) is externally connected to a test section of an 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 tube 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, and the inner tube of the electrode outlet section (1) moves forward, thereby opening a connection passage between the electrode outlet section (1) and the nozzle connecting flange (4); the inner tube of the electrode outlet section (1) moves backward, and the valve plate of the vacuum gate valve (3) is located at the lower limit position, thereby disconnecting the connection passage between the electrode outlet section (1) and the nozzle connecting flange (4); 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).

2. The vacuum connection device for separating an arc wind tunnel heater and a nozzle according to claim 1, characterized in that: The inner tube length 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 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 sandwich water-cooled structure, the inner shell is oxygen-free copper, the outer shell is stainless steel, and a water-blocking tube is used to achieve water inlet and outlet at one end; at the front end face of the inner tube, there is a sheet flange I for inner cavity water cooling connected to the electrode, 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 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) by 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 bolt I, and the hexagonal bolt is used to achieve connection positioning and connection sealing; The adjusting 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 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 with the vacuum environment between the test section through the vacuum stop valve.

6. 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.

7. A method for using a vacuum connection device for separating an arc wind tunnel heater from a nozzle, the method being used for the vacuum connection device for separating an arc wind tunnel heater from a nozzle as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: 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, the arc heater dragging feeding device drags the electrode outlet section (1) to move backward, 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, and the connection channel between the electrode outlet section (1) and the nozzle connecting flange (4) is opened 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 balance the internal pressure of the vacuum gate valve (3) valve body with the internal pressure of the arc heater; adjust the stud bolts to release the moving space of the electrode outlet section (1); drag the electrode outlet section (1) forward by the arc heater dragging feeding device 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, disconnects the connection channel between the electrode outlet section (1) and the nozzle connecting flange (4), and isolates 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 stop 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 and 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.

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