Pitot tube sliding sealing device for high-temperature wind tunnel test equipment

Abstract

The pitot tube sliding sealing device for the high-temperature wind tunnel test equipment comprises a sealing groove capable of covering a wind tunnel opening and a sliding belt for sealing the wind tunnel opening, a through groove covering the wind tunnel opening is formed in the side, facing the wind tunnel, of the sealing groove, and sliding holes allowing the sliding belt to penetrate through the through groove are formed in the two ends of the through groove; the portion, located in the sliding groove, of the sliding belt is provided with a penetrating hole allowing the pitot tube to penetrate through, a flexible connector used for sealing is arranged between the penetrating hole and the pitot tube, and the outer wall of the wind tunnel is provided with a driving mechanism capable of driving the sliding belt to slide so that the belt can keep the same moving speed and moving distance as the pitot tube. Therefore, the pitot tube does not affect the sealing performance of the wind tunnel opening in the swinging process.

Description

Technical Field

[0001] The invention relates to the technical field of carbon emission detection, and in particular to a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment. Background Art

[0002] In recent years, with the change of global climate, greenhouse gas emission reduction has attracted more and more attention. Effectively controlling and reducing greenhouse gas emissions is a huge challenge that mankind is currently facing. A research report pointed out that about 35% of the world's CO 2 Emissions mainly come from the power and heat industries. Climate change caused by carbon emissions has brought environmental problems. The national carbon trading market is fully open. For a large enterprise, annual carbon dioxide emissions may reach millions of tons. A 1% difference in the calculated emission data will involve millions of yuan in carbon trading quotas. Therefore, accurate measurement of carbon trading is crucial.

[0003] At present, the carbon emissions accounting method in the domestic carbon trading market is still mainly based on fuel-side calculations. For enterprises using solid fuels, the uneven quality of solid fuels will cause greater uncertainty in the carbon emissions data calculated at the fuel end.

[0004] The measurement of flue carbon emissions requires the simultaneous measurement of the carbon dioxide concentration and flue flow in the flue. Usually, the flue concentration measurement has a high accuracy (about 1%-5%), while the measurement accuracy of the flue flow is often low (about 3%-50%). Due to the large flue diameter, high temperature and humidity, complex flow, and high turbulence, the conventional pitot tube calibrated with air at normal temperature and pressure will cause large errors in measurements in flues with high temperature and humidity, complex flow, and high turbulence.

[0005] In order to solve the problem that the conventional pitot tube calibrated with air at normal temperature and pressure will cause large errors in the measurement of flue with high temperature, high humidity, complex flow and high turbulence, the China National Institute of Metrology and the Zhengzhou Institute of Advanced Metrology Technology jointly developed a high-temperature wind tunnel device that can simulate high temperature, high humidity, high turbulence and positive and negative pressure in the flue. Since the installed pitot tube cannot be calibrated directly in the wind tunnel device, the pitot tube installed in the flue is used for online continuous monitoring. After it is removed, the data cannot be monitored, so it must be calibrated online to transfer the benchmark value after the test to the flow meter in the flue. The comparison device needs to use a three-dimensional pitot tube to measure the flow velocity and flow velocity angle. Therefore, during the calibration process, it is necessary to measure the standard values ​​of the three-dimensional pitot tube at different yaw angles and pitch angles. Therefore, it is necessary to open an opening 1800mm long and 80mm wide on the wind tunnel device so that a dedicated drive device can control the swing of the three-dimensional Pitot tube during the measurement process. Since an opening that is too large will affect the flow field at the measuring point and cause inaccurate standard values, a sealing device is required to ensure the sealing of the wind tunnel opening while ensuring that the Pitot tube does not affect the sealing of the wind tunnel opening during the swing measurement.

[0006] The purpose of the present invention is to solve the above-mentioned technical problems and shortcomings and to provide a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment, which can seal the wind tunnel opening and ensure that the Pitot tube does not affect the sealing of the wind tunnel opening during the swing measurement process.

[0007] In order to solve the deficiencies of the above-mentioned technical problems, the technical solution adopted by the present invention is: a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment, comprising a sealing groove capable of covering the wind tunnel opening and a sliding belt for sealing the wind tunnel opening, a through groove covering the wind tunnel opening is provided on the side of the sealing groove facing the wind tunnel, sliding holes for the sliding belt to pass through the through groove are provided at both ends of the through groove, a through hole for the Pitot tube to pass through is provided on the part of the sliding belt located in the sliding groove, a soft connection for sealing is provided between the through hole and the Pitot tube, and a driving mechanism capable of driving the sliding belt to slide is provided on the outer wall of the wind tunnel, so that the belt maintains a moving speed and moving distance consistent with the Pitot tube.

[0008] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the present invention, the sliding belt is provided with a trumpet-shaped wind groove with a cover-shaped perforation, the large diameter end of the trumpet-shaped wind groove is connected to the sliding belt, and the tail end of the Pitot tube passes through the trumpet-shaped wind groove and the perforation in sequence and is tightly connected with the small diameter end of the trumpet-shaped wind groove through a tensioning belt.

[0009] As a further optimization of a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment according to the present invention, the driving mechanism includes a power component and multiple guide components, the guide component includes a first fixed block that can be fixed on the outer wall of the wind tunnel, a guide wheel is rotatably provided on the first fixed block, and the outer circle of the guide wheel is in contact with the inner side of the sliding belt, the power component includes a motor and a driving wheel, the motor is fixed to the outer wall of the wind tunnel through a second fixed block, the driving wheel is sleeved on the output shaft of the motor, and the outer circle of the driving wheel is in contact with the sliding belt.

[0010] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the present invention, a preload component capable of providing preload force to the sliding belt is further provided on the outer wall of the wind tunnel, the preload component comprises a mounting block capable of being fixed on the outer wall of the wind tunnel, the mounting block is provided with a groove extending in the direction of the sliding belt, a slider slides in the groove, a spring is provided between the slider and a side of the groove away from the sliding belt, a preload wheel is provided on the outward side of the slider for rotation, the outer circle of the preload wheel is fitted with the sliding belt, when the elastic force of the spring is stretched, the preload wheel and the sliding belt provide preload force.

[0011] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the present invention, a limiting wheel corresponding to the guide wheel is provided on the side of the sliding belt away from the guide wheel. The limiting wheel is connected to the corresponding second fixed block through a connecting rod, and a limiting space for sliding of the sliding belt is formed between the limiting wheel and the guide wheel.

[0012] As a further optimization of the Pitot tube sliding sealing device for high temperature wind tunnel test equipment of the present invention, an annular groove for the sliding belt to fall into is provided on the outer side of the guide wheel, and the opening of the annular groove is gradually tightened from the outside to the inside.

[0013] As a further optimization of the Pitot tube sliding seal device for high-temperature wind tunnel test equipment of the present invention, the outer circle of the driving wheel is provided with friction particles that increase the friction force.

[0014] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the present invention, a sealing ring is embedded in the inner wall of the sliding hole.

[0015] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the present invention, a plurality of mounting holes for installation are opened on the sealing groove, a sealing ring is provided on the side of the sealing groove facing the wind tunnel opening, and the sliding groove is located in the sealing ring.

[0016] The present invention has the following beneficial effects: the present invention provides a sealing groove at the opening of the wind tunnel, and provides a sliding belt on the sealing groove so that the sliding belt seals the opening of the wind tunnel; the sliding belt can maintain a consistent moving speed and moving distance with the Pitot tube during the sliding process, thereby ensuring that the Pitot tube will not affect the sealing of the wind tunnel opening during the swinging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the sealing device of the present invention;

[0018] Figure 2 It is a schematic diagram of the state where the Pitot tube moves to different positions;

[0019] Figure numerals: 1. Pitot tube, 2. Sealing groove, 201. Through groove, 3. Sliding belt, 4. First fixed block, 5. Limiting wheel, 6. Spring, 7. Guide wheel, 8. Driving wheel, 9. Reducer, 10. Motor, 11. Second fixed block, 12. Perforation, 13. Mounting block, 14. Slider, 15. Spring, 16. Groove, 17. Preload wheel. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 1 As shown, the present invention provides a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment, comprising a sealing groove 2 capable of covering a wind tunnel opening, a sliding belt 3 passed through the sealing groove 2 and sealing the wind tunnel opening, and a driving mechanism for driving the sliding belt 3 to slide, wherein the sliding belt 3 is provided with a through hole 12 for the Pitot tube 1 to pass through, and as the driving device for externally driving the Pitot tube 1 to swing is started, the driving mechanism makes the sliding belt 3 maintain a consistent moving speed and moving distance with the Pitot tube 1, thereby ensuring that the Pitot tube will not affect the sealing of the wind tunnel opening during the swinging process.

[0022] In this embodiment, a plurality of mounting holes for installation are provided on the sealing groove 2, and the sealing groove 2 can be fixed at the wind tunnel opening through the mounting holes. A through groove 201 covering the wind tunnel opening is provided on the side of the sealing groove 2 facing the wind tunnel, so that the Pitot tube 1 can pass through the sealing groove 2 and swing at an angle. A sealing ring is provided on the side of the sealing groove 2 facing the wind tunnel opening, and the slide groove 201 is located in the sealing ring. The sealing ring ensures the sealing of the connection between the sealing groove 2 and the wind tunnel.

[0023] Both ends of the through groove 201 are provided with sliding holes for the sliding belt 3 to pass through the through groove 201, and the inner wall of the sliding hole is embedded with a sealing ring for ensuring the sealing of the connection between the sliding belt 3 and the sliding hole. The upper and lower sides of the part of the sliding belt 3 entering the through groove 20 are in contact with the upper and lower inner walls of the through groove 201, so that the part of the sliding belt 3 located in the sliding groove 201 can seal the through groove 201, thereby achieving the sealing of the wind tunnel opening. The perforation 12 is opened in the part of the sliding belt 3 located in the sliding groove 201, and a soft connection for sealing the connection between the Pitot tube 1 and the sliding belt 3 is provided at the perforation 12 of the sliding belt 3, so as to ensure the sealing between the Pitot tube 1 and the sliding belt 3 during the swinging process, thereby ensuring that the Pitot tube will not affect the sealing of the wind tunnel opening during the swinging process.

[0024] In this embodiment, the structure used for the sealing soft connection between the perforation 12 and the Pitot tube 1 is a trumpet-shaped wind groove, the material of the trumpet-shaped wind groove is soft rubber material, the large diameter end of the trumpet-shaped wind groove is connected to the sliding belt 3, the perforation 12 is located in the trumpet-shaped wind groove, and after the tail end of the Pitot tube 1 passes through the trumpet-shaped wind groove and the perforation 12 in turn, the Pitot tube 1 can be tightly connected to the small diameter end of the trumpet-shaped wind groove through the tensioning belt, thereby ensuring the sealing of the Pitot tube 1 and the sliding belt 3, while ensuring its soft connection, which facilitates the swing of the Pitot tube 1.

[0025] In this embodiment, the driving mechanism includes a power assembly and a plurality of guide assemblies. The power assembly is used to drive the sliding belt 3 to slide. The guide assembly supports and guides the sliding belt 3. The guide assembly includes a first fixed block 4 that can be fixed on the outer wall of the wind tunnel. A guide wheel 7 is rotatably provided on the first fixed block 4. The outer circle of the guide wheel 7 fits with the inner side of the sliding belt 3, thereby controlling the directional sliding of the sliding belt 3 and guiding the sliding belt 3. The power assembly includes a motor 10 and a driving wheel 8. The motor 10 is fixed on the outer wall of the wind tunnel through a second fixed block 11. The driving wheel 8 is sleeved on the output shaft of the motor 10. The outer circle of the driving wheel 8 fits with the sliding belt 3. The sliding belt 3 is driven to rotate through the friction between the driving wheel 8 and the sliding belt 3. At the same time, in order to improve the driving ability of the driving wheel 8, friction particles that increase friction are provided on the outer circle of the driving wheel 8.

[0026] Since the sliding belt 3 may become loose after long-term operation, in order to ensure the performance of the sliding belt 3, a pre-tightening component that can provide pre-tightening force to the sliding belt 3 is also provided on the outer wall of the wind tunnel. The pre-tightening component includes a mounting block 13 that can be fixed on the outer wall of the wind tunnel. The mounting block 13 is provided with a groove 16 extending in the direction 3 of the sliding belt. A slider 14 slides in the groove 16. A spring 15 is provided between the slider 14 and the side of the groove 16 away from the sliding belt. A pre-tightening wheel 17 is provided on the outward side of the slider 14. The outer circle of the pre-tightening wheel 17 fits with the sliding belt 3. When the elastic force of the spring 15 is stretched, the pre-tightening wheel 17 and the sliding belt 3 provide pre-tightening force.

[0027] In order to prevent the sliding belt 3 from falling off the guide wheel 7, the present invention provides two structures for preventing the sliding belt 3 from sliding off. Structure 1: A limiting wheel 5 corresponding to the guide wheel 7 is provided on the side of the sliding belt 3 away from the guide wheel 7. The limiting wheel 5 is connected to the corresponding second fixed block 11 through a connecting rod 6. A limiting space for the sliding belt 3 to slide is formed between the limiting wheel 5 and the guide wheel 7. The position of the sliding belt 3 is limited by the limiting space to prevent the sliding belt 3 from falling off the guide wheel 7. Structure 2: An annular groove for the sliding belt 3 to fall into is provided on the outer side of the guide wheel 7, and the opening of the annular groove is gradually tightened from the outside to the inside. The tightened opening prevents the sliding belt 3 from falling off the guide wheel 7, thereby avoiding abnormal sliding of the sliding belt 3.

[0028] like Figure 2 As shown, the pitot tube 1 rotates around the center of the high temperature wind tunnel test section. As the pitot tube 1 rotates, the motors 10 on the left and right sides are controlled to rotate according to the position recognition, and the power is transmitted to the drive wheel 8 through the reducer 9, and the drive wheel 8 drives the sliding belt 3 to move. The belt 3 swings in a cycle under the action of the drive wheels 8, the guide wheel 7 and the preload wheel 17 on the left and right sides. In this way, the pitot tube 1 is always kept in the middle of the perforation 12.

[0029] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A Pitot tube sliding sealing device for high temperature wind tunnel test equipment, comprising a sealing groove (2) covering a wind tunnel opening and a sliding belt (3) sealing the wind tunnel opening, characterized in that: The sealing groove (2) is provided with a through groove (201) covering the opening of the wind tunnel on the side facing the wind tunnel, and sliding holes for allowing the sliding belt (3) to pass through the through groove (201) are provided at both ends of the through groove (201), and a through hole (12) for allowing the pitot tube (1) to pass through is provided in the part of the sliding belt (3) located in the sliding groove (201), and a soft connection for sealing is provided between the through hole (12) and the pitot tube (1), and a driving mechanism capable of driving the sliding belt (3) to slide is provided on the outer wall of the wind tunnel, so that the belt (3) maintains a moving speed and moving distance consistent with those of the pitot tube (1).

2. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 1, characterized in that: The sliding belt (3) is provided with a trumpet-shaped air slot which covers the through hole (12); the large-diameter end of the trumpet-shaped air slot is connected to the sliding belt (3); the tail end of the pitot tube (1) passes through the trumpet-shaped air slot and the through hole (12) in sequence and is in close contact with the small-diameter end of the trumpet-shaped air slot via a tensioning belt.

3. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 1, characterized in that: The driving mechanism comprises a power assembly and a plurality of guide assemblies, wherein the guide assembly comprises a first fixed block (4) capable of being fixed on the outer wall of the wind tunnel, a guide wheel (7) being rotatably provided on the first fixed block (4), the outer circle of the guide wheel (7) being in contact with the inner side of the sliding belt (3), and the power assembly comprises a motor (10) and a driving wheel (8), the motor (10) being fixed on the outer wall of the wind tunnel via a second fixed block (11), the driving wheel (8) being sleeved on the output shaft of the motor (10), and the outer circle of the driving wheel (8) being in contact with the sliding belt (3).

4. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 3, characterized in that: The outer wall of the wind tunnel is also provided with a pre-tightening component capable of providing a pre-tightening force to the sliding belt (3), the pre-tightening component comprising a mounting block (13) capable of being fixed on the outer wall of the wind tunnel, the mounting block (13) being provided with a groove (16) extending in the direction of the sliding belt (3), a slider (14) sliding in the groove (16), a spring (15) being provided between the slider (14) and a side of the groove (16) away from the sliding belt, a pre-tightening wheel (17) being provided on the side of the slider (14) rotating outward, the outer circle of the pre-tightening wheel (17) being in contact with the sliding belt (3), when the elastic force of the spring (15) is stretched, the pre-tightening wheel (17) and the sliding belt (3) are provided with a pre-tightening force.

5. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 4, characterized in that: A limiting wheel (5) corresponding to the guide wheel (7) is provided on the side of the sliding belt (3) away from the guide wheel (7); the limiting wheel (5) is connected to the corresponding second fixed block (11) through a connecting rod (6); and a limiting space for the sliding belt (3) to slide is formed between the limiting wheel (5) and the guide wheel (7).

6. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 5, characterized in that: The outer side of the guide wheel (7) is provided with an annular groove for the sliding belt (3) to fall into, and the opening of the annular groove is gradually tightened from the outside to the inside.

7. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 4, characterized in that: The outer circumference of the driving wheel (8) is provided with friction particles for increasing friction force.

8. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 1, characterized in that: A sealing ring is embedded in the inner wall of the sliding hole.

9. The Pitot tube sliding seal device for high temperature wind tunnel test equipment according to claim 1, characterized in that: The sealing groove (2) is provided with a plurality of mounting holes for mounting, a sealing ring is provided on the side of the sealing groove (2) facing the wind tunnel opening, and the sliding groove (201) is located inside the sealing ring.

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