A vacuum exhaust device for an arc wind tunnel test section

Abstract

The present application relates to the technical field of arc wind tunnel test equipment, and particularly relates to a vacuum pumping device for an arc wind tunnel test section, which comprises a wind tunnel test section, a vacuum pumping control valve connected to the side wall of the wind tunnel test section, a water leakage monitoring assembly and a drainage assembly arranged at the bottom of the wind tunnel test section, and the drainage assembly is used for draining the accumulated water; the vacuum pumping control valve is connected to a control system, a model measuring cable is connected to a model by penetrating the side wall of the wind tunnel test section, the model measuring cable is used for measuring the state of the model, the model measuring cable is connected to the control system through a signal acquisition module, and the water leakage monitoring assembly is electrically connected to the signal acquisition module. In the present application, the size of the air vent of the valve body of the vacuum pumping control valve can be selected according to the size of the wind tunnel test section, so as to meet the vacuum pumping requirements of test sections with different sizes; the vacuum silencer is arranged, so as to greatly reduce the noise decibels when the test section is pumped to vacuum; the state of the model is monitored in real time; and the internal accumulated water can be quickly drained when water leakage is abnormal.

Description

Technical Field

[0001] This invention relates to the field of electric arc wind tunnel testing equipment technology, and in particular to a vacuum extraction device for an electric arc wind tunnel testing section. Background Technology

[0002] In the field of aerospace aerothermodynamics, electric arc heaters generate an electric arc to heat the airflow. The airflow passes through a supersonic nozzle and forms a high-temperature flow field in the electric arc wind tunnel test section, performing tests such as material ablation and structural thermal sealing on the model installed in the test section. To create a supersonic flow field in the test section, the test section needs to be connected to a vacuum system and evacuated before the test begins. After the test, when checking the model's performance, the vacuum system needs to be disconnected from the test section and the vacuum needs to be released.

[0003] Existing vacuum control valves are limited by the valve body opening size, making them suitable only for wind tunnel test sections of a certain size, resulting in low versatility. When evacuating the test section, it is easy to draw unsecured model measurement cables leading out of the test section into it, causing cable damage. Furthermore, the cable exit points require repeated sealing, increasing workload. The excessive airflow noise during vacuum release can cause varying degrees of hearing damage to wind tunnel operators. When the arc heater or other water-cooled equipment leaks, large amounts of water can easily accumulate in the test section, which is difficult to clean and can also cause varying degrees of damage to other vacuum equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum extraction device for an electric arc wind tunnel test section, which can adapt to wind tunnel test sections of different sizes; and can quickly drain internal water when leakage is abnormal, and monitor the model status in real time.

[0005] This invention provides a vacuum extraction device for an electric arc wind tunnel test section, comprising a wind tunnel test section, a vacuum extraction control valve connected to the side wall of the wind tunnel test section, and a leakage monitoring component and a drainage component at the bottom of the wind tunnel test section, the drainage component being used to drain accumulated water; the vacuum extraction control valve being connected to a control system; a model measurement cable passing through the side wall of the wind tunnel test section and connected to a model, the model measurement cable being used to measure the state of the model; the model measurement cable being connected to the control system via a signal acquisition module; and the leakage monitoring component being electrically connected to the signal acquisition module.

[0006] Preferably, the vacuum extraction control valve includes a valve body and a connecting base. The connecting base is fixedly connected to the outer wall of the wind tunnel test section. A through hole is provided on the connecting base. The valve body communicates with the interior of the wind tunnel test section through the through hole. A valve stem is provided inside the valve body. The valve stem can move axially along the valve body. The top of the valve stem can abut against the surface of the connecting base through a valve seat. The valve body includes an upper valve body and a lower valve body that are detachably connected from top to bottom. The upper valve body has several vent holes on its side wall. The lower part of the lower valve body is connected to a cylinder. The lower end of the valve stem is connected to a piston head. The piston head divides the cylinder into an upper chamber and a lower chamber from top to bottom. The piston head can move up and down within the cylinder.

[0007] Preferably, a vacuum silencer is fitted on the outer side of the upper valve body.

[0008] Preferably, a set screw is provided between the upper part of the cylinder and the valve stem.

[0009] Preferably, an elastic element is provided between the bottom of the valve seat and the top of the cylinder.

[0010] Preferably, the upper cavity sidewall is connected to the solenoid reversing valve via an upper air inlet pipe, the lower cavity sidewall is connected to the solenoid reversing valve via a lower air inlet pipe, the solenoid reversing valve is connected to an air source, and the solenoid reversing valve is electrically connected to the control system.

[0011] Preferably, the connecting base is further provided with a cable hole, through which the model measuring cable passes into the wind tunnel test section and connects to the model, and a sealing cable buckle is provided between the cable hole and the model measuring cable.

[0012] Preferably, the drainage assembly includes a drainage channel disposed at the bottom of the wind tunnel test section, and a drainage solenoid valve is provided on the drainage channel, the drainage solenoid valve being electrically connected to the control system.

[0013] Preferably, the wind tunnel test section is equipped with an electric arc heater, and the control system is electrically connected to the electric arc heater.

[0014] Preferably, a vacuum pipeline valve is provided on the side wall of the wind tunnel test section, the vacuum pipeline valve is connected to the vacuum unit, and the vacuum pipeline valve is connected to the control system.

[0015] Beneficial effects: In this invention, the size of the vent hole on the upper valve body of the vacuum extraction control valve can be selected according to the size of the wind tunnel test section. By replacing the upper valve body with different specifications of openings, the vacuum extraction requirements of test sections of different sizes can be met. A vacuum silencer is coaxially installed on the outside of the valve body, which can greatly reduce the noise level during vacuum release in the test section.

[0016] This invention connects the model measurement cable through a signal acquisition module to monitor the model status in real time; and uses a sealing cable clip to fix the cable and seal the gaps in the cable hole.

[0017] In this invention, a water leakage monitoring component and a drainage component are installed at the bottom of the wind tunnel test section. When the electric arc heater and other water-cooled equipment leak water, the water leakage monitoring component can collect the changing humidity signal in time. After receiving the signal, the control system can control the electric arc heater to stop operating in time and perform vacuuming treatment on the wind tunnel test section. After the vacuuming is completed, the drainage component is used to quickly remove the accumulated water, thus realizing the safe monitoring and protection of equipment operation. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the combined structure of the invention and the wind tunnel test section; Figure 2 This is a schematic diagram of the vacuum pumping control valve of the present invention during vacuuming. Figure 3 This is a schematic diagram of the vacuum release control valve of the present invention during vacuum release. Figure 4 This is a schematic diagram of the module composition of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1-Wind tunnel test section, 2-Model, 3-Model measurement cable, 301-Cable hole, 302-Sealed cable clip, 4-Signal acquisition module, 5-Arc heater, 6-Vacuum extraction control valve, 601-Connecting base, 602-Upper valve body, 603-Lower valve body, 604-Vacuum silencer, 605-Ventilation hole, 606-Valve seat, 607-Sealing gasket, 608-Washer ring, 609-Bolt, 6010- Return spring, 6011-set screw, 6012-cylinder, 6013-cylinder head, 6014-valve stem, 6015-piston head, 6016-upper intake pipe, 6017-lower intake pipe, 6018-solenoid directional valve, 7-pressure gauge, 8-pressure sensor, 9-control system, 10-signal processing module, 11-drain solenoid valve, 12-vacuum pipeline valve, 13-vacuum unit, 14-leakage monitoring component. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Example 1 like Figures 1-4 As shown, a vacuum extraction device for an electric arc wind tunnel test section includes a wind tunnel test section 1, a vacuum extraction control valve 6 connected to the side wall of the wind tunnel test section 1, and a control system 9 connected to the vacuum extraction control valve 6. The vacuum extraction control valve 6 includes a valve body and a connecting base 601. The connecting base 601 is fixedly connected to the outer wall of the wind tunnel test section 1. A through hole is provided on the connecting base 601. The valve body communicates with the inside of the wind tunnel test section 1 through the through hole. A valve stem 6014 is provided in the valve body. The valve stem 6014 can move along the axial direction of the valve body. The top of the valve stem 6014 can abut against the surface of the connecting base 601 through the valve seat 606 to achieve a seal between the valve seat 606 and the connecting base 601. A sealing gasket 607 is provided on the top of the valve seat 606. The sealing gasket 607 is located at the connection between the valve seat 606 and the connecting base 601. A washer 608 is provided at the center of the top of the valve seat 606. A bolt 609 is threadedly connected to the valve seat 606. The bolt 609 presses the washer 608 between the bolt 609 and the valve seat 606. The washer 608 is pressed on the edge of the sealing gasket 607, which can further limit the sealing gasket 607.

[0025] Model measurement cable 3 passes through the side wall of wind tunnel test section 1 and connects to model 2. Model measurement cable 3 is used to measure the state of model 2. Model measurement cable 3 is connected to control system 9 through signal acquisition module 4. A cable hole 301 is also provided on the connecting base 601. Model measurement cable 3 passes through cable hole 301 into wind tunnel test section 1 and connects to model 2. A sealing cable clip 302 is provided between cable hole 301 and model measurement cable 3. The model measurement cable 3 can be a thermocouple to detect the temperature and pressure of model 2. The sealing cable clip 302 is a common structure in this field and will not be described in detail here. The sealing cable clip 302 can seal the gap between model measurement cable 3 and cable hole 301.

[0026] The top of the connecting base 601 is also equipped with a pressure gauge 7 and a pressure sensor 8. The pressure sensor 8 is connected to the information acquisition module. Both the pressure gauge 7 and the pressure sensor 8 are used to monitor the pressure change data of the vacuuming in the wind tunnel test section 1 to determine whether the vacuuming process is running normally. When the vacuuming ends, the control system 9 can close the vacuum pipeline valve 12 in time to avoid equipment damage.

[0027] The valve body comprises an upper valve body 602 and a lower valve body 603, which are detachably connected from top to bottom. The upper valve body 602 has several vent holes 605 on its side wall. The size of the vent holes 605 can be machined according to the dimensions of the wind tunnel test section 1. By replacing the upper valve body 602 with different vent hole specifications, the vacuum evacuation requirements of test sections of different sizes can be met, improving versatility. A vacuum silencer 604 is fitted onto the outside of the upper valve body 602, and the vacuum silencer 604 is coaxially mounted with the valve body. The vacuum silencer 604, fitted onto the outside of the vent holes 605, can significantly reduce the noise level during vacuum release in the test section.

[0028] The lower inner wall of the lower valve body 603 is connected to the cylinder 6012. The cylinder 6012 has a cylinder head 6013 at its bottom. The lower end of the valve stem 6014 is connected to the piston head 6015. The piston head 6015 divides the cylinder 6012 into an upper chamber and a lower chamber from top to bottom, and the piston head 6015 can move up and down within the cylinder 6012. The side wall of the upper chamber is connected to the solenoid directional valve 6018 through the upper air inlet pipe 6016, and the side wall of the lower chamber is connected to the solenoid directional valve 6018 through the lower air inlet pipe 6017. The solenoid directional valve 6018 is connected to the air source and is electrically connected to the control system 9 through the signal processing module 10. By controlling the movement trajectory of the piston head 6015 within the cylinder 6012, the distance between the valve seat 606 and the connecting base 601 can be adjusted to cooperate with the vacuum pumping operation in the wind tunnel test section 1.

[0029] An elastic element is provided between the bottom of the valve seat 606 and the top of the cylinder 6012. This elastic element can be a return spring 6010, with both ends fixedly connected to the valve seat 606 and the cylinder 6012 respectively. This helps to buffer the movement of the valve seat 606 and prevent excessive impact from damaging parts. A set screw 6011 is provided between the upper part of the cylinder 6012 and the valve stem 6014, effectively enhancing the sealing between the side wall of the cylinder 6012 and the valve stem 6014.

[0030] During vacuum release, the control system 9 sends a control signal, and the electromagnetic reversing valve 6018 controls the upper air inlet pipe 6016 to allow air to enter the upper cavity and the lower air inlet pipe 6017 to exit. The piston head 6015 drives the valve rod 6014 to move downward, causing the valve seat 606 to separate from the connecting base 601, and vacuum release is achieved through the vent 605. During vacuuming, the vacuum release control valve 6 needs to be closed. At this time, the control system 9 sends a corresponding signal, and the electromagnetic reversing valve 6018 controls the lower air inlet pipe 6017 to allow air to enter. When the upper air inlet pipe 6016 exits, the piston head 6015 drives the valve rod 6014 to move upward until the top of the valve seat 606 abuts against the connecting base 601, achieving a seal.

[0031] The bottom of the wind tunnel test section 1 is equipped with a leakage monitoring component 14 and a drainage component. The leakage monitoring component 14 is electrically connected to the signal acquisition module 4. The leakage monitoring component 14 can use a high-precision capacitive hygrometer to collect changing humidity signals. The drainage component is used to drain accumulated water; the drainage component includes a drainage channel located at the bottom of the wind tunnel test section 1, and a drainage solenoid valve 11 is installed on the drainage channel. The drainage solenoid valve 11 is electrically connected to the control system 9.

[0032] A vacuum pipe valve 12 is installed on the side wall of the wind tunnel test section 1. The vacuum pipe valve 12 is connected to the vacuum unit 13 and the control system 9. The vacuum unit 13 is a commonly used device in this field, used to extract gas from the wind tunnel test section 1 to form a vacuum.

[0033] The signal acquisition module 4, vacuum pipeline valve 12 and drain solenoid valve 11 are all connected to the control system 9 through the signal processing module 10. The signal processing module 10 is used to analyze and process the information from the signal acquisition module 4 and vacuum pipeline valve 12. The signal processing system determines whether there are abnormalities such as water leakage.

[0034] An electric arc heater 5 is installed in the wind tunnel test section 1, and the control system 9 is electrically connected to the electric arc heater 5 through the signal processing module 10.

[0035] Work process: Before the test begins, the model measurement cable 3 passes through the cable hole 301 into the wind tunnel test section 1 and connects to the model 2. The model measurement cable 3 is fixed by the sealing cable buckle 302 and the cable hole 301 is sealed. The model measurement cable 3 is connected to the signal acquisition module 4. The control system 9 detects that the model measurement cable 3 connected to the signal acquisition module 4 is in a conductive state. When a vacuum signal is received, the control system 9 sends a signal to close the vacuum pumping control valve 6, controls the solenoid reversing valve 6018 to operate, and controls the control gas to enter the lower cavity through the lower air inlet pipe 6017 and exit through the upper air inlet pipe 6016. The piston head 6015 drives the valve rod 6014 to move upward, and the return spring 6010 gradually returns to its length until the top of the valve seat 606 abuts against the connecting base 601, and the sealing gasket 607 is in close contact with the connecting base 601 to achieve a seal. The control system 9 opens the vacuum pipeline valve 12, and the vacuum unit 13 starts working to evacuate the wind tunnel test section 1.

[0036] During the experiment, the control system 9 can control the arc heater 5 to work, heating the airflow to form a high-temperature flow field.

[0037] After the test, the wind tunnel test section 1 needs to be vented. The control system 9 sends a signal to open the vacuum release control valve 6, controls the electromagnetic reversing valve 6018 to change direction, and controls the air to enter the upper cavity through the upper air inlet pipe 6016 and exit through the lower air inlet pipe 6017. The piston head 6015 drives the valve rod 6014 to move downward, so that the valve seat 606 separates from the connecting base 601, and the vacuum is released through the vent hole 605. During the vacuum release process, the gas enters the vent hole 605 through the vacuum silencer 604, which greatly reduces the noise decibels during the vacuum release of the test section.

[0038] When the electric arc heater 5 or other water-cooled equipment leaks water during the test, the humidity signal collected by the leakage monitoring component 14 changes. The humidity signal is transmitted to the signal processing module 10 via the signal acquisition module 4. The signal processing module 10 determines the abnormal leakage situation. After receiving the judgment result, the control system 9 issues a stop operation signal, shuts down the electric arc heater 5 and the vacuum pipeline valve 12, and releases the wind tunnel test section 1 to normal pressure. Then, the control system 9 controls the drainage solenoid valve 11 to open, so that the water accumulated in the test section can be quickly discharged through the drainage channel, thus realizing the equipment operation safety monitoring and protection function.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vacuum extraction device for an electric arc wind tunnel test section, characterized in that, The system includes a wind tunnel test section, with a vacuum extraction control valve connected to the side wall of the wind tunnel test section. A leakage monitoring component and a drainage component are installed at the bottom of the wind tunnel test section, with the drainage component used to drain accumulated water. The vacuum extraction control valve is connected to a control system. A model measurement cable passes through the side wall of the wind tunnel test section and connects to the model. The model measurement cable is used to measure the state of the model. The model measurement cable is connected to the control system via a signal acquisition module. The leakage monitoring component is electrically connected to the signal acquisition module.

2. The vacuum extraction device for the electric arc wind tunnel test section according to claim 1, characterized in that, The vacuum extraction control valve includes a valve body and a connecting base. The connecting base is fixedly connected to the outer wall of the wind tunnel test section. A through hole is provided on the connecting base. The valve body communicates with the interior of the wind tunnel test section through the through hole. A valve stem is provided in the valve body. The valve stem can move axially along the valve body. The top of the valve stem can abut against the surface of the connecting base through a valve seat. The valve body includes an upper valve body and a lower valve body that are detachably connected from top to bottom. The upper valve body has several vent holes on its side wall. The lower part of the lower valve body is connected to a cylinder. The lower end of the valve stem is connected to a piston head. The piston head divides the cylinder into an upper chamber and a lower chamber from top to bottom. The piston head can move up and down within the cylinder.

3. The vacuum extraction device for the electric arc wind tunnel test section according to claim 2, characterized in that, A vacuum silencer is fitted on the outer side of the upper valve body.

4. The vacuum extraction device for the electric arc wind tunnel test section according to claim 2, characterized in that, A set screw is provided between the upper part of the cylinder and the valve stem.

5. The vacuum extraction device for the electric arc wind tunnel test section according to claim 2, characterized in that, An elastic element is provided between the bottom of the valve seat and the top of the cylinder.

6. The vacuum extraction device for the electric arc wind tunnel test section according to claim 2, characterized in that, The upper cavity sidewall is connected to the solenoid reversing valve via an upper air inlet pipe, and the lower cavity sidewall is connected to the solenoid reversing valve via a lower air inlet pipe. The solenoid reversing valve is connected to the air source and is electrically connected to the control system.

7. The vacuum extraction device for the electric arc wind tunnel test section according to claim 2, characterized in that, The connecting base is also provided with a cable hole, through which the model measurement cable passes into the wind tunnel test section and connects to the model. A sealing cable buckle is provided between the cable hole and the model measurement cable.

8. The vacuum extraction device for the electric arc wind tunnel test section according to claim 1, characterized in that, The drainage assembly includes a drainage channel located at the bottom of the wind tunnel test section, and a drainage solenoid valve is provided on the drainage channel. The drainage solenoid valve is electrically connected to the control system.

9. The vacuum extraction device for the electric arc wind tunnel test section according to claim 1, characterized in that, An electric arc heater is installed in the wind tunnel test section, and the control system is electrically connected to the electric arc heater.

10. The vacuum extraction device for the electric arc wind tunnel test section according to claim 1, characterized in that, The wind tunnel test section is equipped with a vacuum pipeline valve on its side wall. The vacuum pipeline valve is connected to the vacuum unit and the control system.

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