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

Abstract

The utility model relates to a pitot tube sliding sealing device for high-temperature wind tunnel test equipment, which comprises a sealing groove capable of covering a wind tunnel opening and a sliding belt for sealing the wind tunnel opening, one side of the sealing groove facing the wind tunnel is provided with a through groove covering the wind tunnel opening, and two ends of the through groove are provided with sliding holes for the sliding belt to pass through 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 utility model relates to the technical field of carbon emission detection, in particular to a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment. Background Art

[0002] 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 on the fuel side.

[0003] Measuring flue carbon emissions requires simultaneous measurement of both the flue carbon dioxide concentration and the flue flow rate. While flue concentration measurements typically have a high accuracy (approximately 1%-5%), flue flow measurement accuracy is often lower (approximately 3%-50%). Due to the large flue diameter, high temperature and humidity, complex flow, and high turbulence, conventional pitot tubes calibrated with normal temperature and pressure air will result in significant errors when measuring in flues with high temperature, high humidity, complex flow, and high turbulence.

[0004] To address the problem that conventional pitot tubes calibrated with air at room temperature and pressure will cause large errors when measured in flues with high temperature, high humidity, complex flow, and high turbulence, the China National Institute of Metrology and the Zhengzhou Institute of Advanced Metrology Technology have jointly developed a high-temperature wind tunnel device that can simulate the high temperature, high humidity, high turbulence, and positive and negative pressure in flues. Since the installed pitot tubes cannot be calibrated directly in the wind tunnel device, the pitot tubes installed in the flue are used for online continuous monitoring. Once removed, they cannot monitor data, so they must be calibrated online to transfer the benchmark values ​​after the test to the flowmeter in the flue. The comparison device requires the use of a three-dimensional pitot tube to measure 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 process. Utility Model Content

[0005] The purpose of the utility model 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.

[0006] In order to solve the deficiencies of the above-mentioned technical problems, the utility model adopts the following technical solutions: 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 portion of the sliding belt located in the slide groove; a soft connection for sealing is provided between the through hole and the Pitot tube; 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 those of the Pitot tube.

[0007] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, the sliding belt is provided with a trumpet-shaped air groove with a cover-shaped perforation, the large-diameter end of the trumpet-shaped air groove is connected to the sliding belt, and the tail end of the Pitot tube passes through the trumpet-shaped air groove and the perforation in sequence and is tightly connected with the small-diameter end of the trumpet-shaped air groove through a tensioning belt.

[0008] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, 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, and 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 drive wheel, the motor is fixed to the outer wall of the wind tunnel through a second fixed block, the drive wheel is sleeved on the output shaft of the motor, and the outer circle of the drive wheel is in contact with the sliding belt.

[0009] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, a pre-tightening component that can provide pre-tightening force to the sliding belt is also provided on the outer wall of the wind tunnel. The pre-tightening component includes a mounting block that can be 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 the side of the groove away from the sliding belt. A pre-tightening wheel is provided on the outward side of the slider. The outer circle of the pre-tightening wheel is in contact with the sliding belt. When the elastic force of the spring is stretched, the pre-tightening wheel and the sliding belt provide pre-tightening force.

[0010] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, 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.

[0011] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, 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.

[0012] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, the outer circle of the driving wheel is provided with friction particles that increase friction.

[0013] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, a sealing ring is embedded in the inner wall of the sliding hole.

[0014] As a further optimization of the Pitot tube sliding sealing device for high-temperature wind tunnel test equipment of the utility model, 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 inside the sealing ring.

[0015] The utility model has the following beneficial effects: the utility model 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 wind tunnel opening. 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 does not affect the sealing of the wind tunnel opening during the swinging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the sealing device of the utility model;

[0017] Figure 2 Schematic diagram of the Pitot tube moving to different positions;

[0018] 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. Through hole, 13. Mounting block, 14. Slider, 15. Spring, 16. Groove, 17. Preload wheel. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] like Figure 1 As shown, the utility model provides a Pitot tube sliding sealing device for high-temperature wind tunnel test equipment, including a sealing groove 2 that can cover the wind tunnel opening, a sliding belt 3 that is passed through the sealing groove 2 and seals the wind tunnel opening, and a driving mechanism that drives the sliding belt 3 to slide. The sliding belt 3 is provided with a through hole 12 for the Pitot tube 1 to pass through. As the driving device that externally drives 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 does not affect the sealing of the wind tunnel opening during the swinging process.

[0021] In this embodiment, a plurality of mounting holes for installation are provided on the sealing groove 2, through which the sealing groove 2 can be fixed at the wind tunnel opening. 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.

[0022] 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 to ensure 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 slide 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 slide groove 201, and the perforation 12 of the sliding belt 3 is provided with a soft connection for sealing the connection between the pitot tube 1 and 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.

[0023] In this embodiment, the structure used for the sealed soft connection between the perforation 12 and the Pitot tube 1 is a trumpet-shaped air trough. The material of the trumpet-shaped air trough is soft rubber material. The large diameter end of the trumpet-shaped air trough is connected to the sliding belt 3. The perforation 12 is located in the trumpet-shaped air trough. After the tail end of the Pitot tube 1 passes through the trumpet-shaped air trough and the perforation 12 in turn, the Pitot tube 1 can be tightly connected to the small diameter end of the trumpet-shaped air trough 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.

[0024] In this embodiment, the drive mechanism includes a power assembly and multiple 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 to 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 is in contact 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 drive wheel 8. The motor 10 is fixed to the outer wall of the wind tunnel by a second fixed block 11. The drive wheel 8 is mounted on the output shaft of the motor 10. The outer circle of the drive wheel 8 is in contact with the sliding belt 3. The friction between the drive wheel 8 and the sliding belt 3 drives the sliding belt 3 to rotate. At the same time, in order to improve the driving ability of the drive wheel 8, friction particles that increase friction are provided on the outer circle of the drive wheel 8.

[0025] 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 of the sliding belt 3. 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.

[0026] In order to prevent the sliding belt 3 and thus the guide wheel 7 from falling off, the utility model provides two structures for preventing the sliding belt 3 from slipping 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 and thus the guide wheel 7 from falling off. Structure 2: An annular groove for the sliding belt 3 to fall into is provided on the outer side of the guide wheel 7. The opening of the annular groove is gradually tightened from the outside to the inside. The tightened opening prevents the sliding belt 3 and thus the guide wheel 7 from falling off, thereby avoiding abnormal sliding of the sliding belt 3.

[0027] like Figure 2 As shown, the pitot tube 1 rotates around a fixed point in the center of the high-temperature wind tunnel test section. As the pitot tube 1 rotates, the left and right motors 10 are controlled to rotate accordingly based on position recognition. This power is transmitted via a reducer 9 to the drive wheel 8, which in turn drives the sliding belt 3. Driven by the left and right drive wheels 8, the guide wheel 7, and the preload pulley 17, the belt 3 oscillates in a circular motion, thereby maintaining the pitot tube 1 in the center of the perforation 12.

[0028] 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 do 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 an opening of the wind tunnel and a sliding belt (3) for sealing the opening of the wind tunnel, characterized in that: The sealing groove (2) is provided with a through groove (201) covering the wind tunnel opening on the side facing the wind tunnel, and sliding holes for 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 the Pitot tube (1) to pass through is provided on the part of the sliding belt (3) located in the through 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 that of the Pitot tube (1); a sealing ring is embedded in the inner wall of the sliding hole; a plurality of mounting holes for mounting are provided on the sealing groove (2), and a sealing ring is provided on the side of the sealing groove (2) facing the wind tunnel opening, and the through groove (201) is located inside the sealing ring.

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

3. The Pitot tube sliding seal device for high-temperature wind tunnel testing equipment according to claim 1, characterized in that: The driving mechanism includes a power assembly and a plurality of guide assemblies. 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) is in contact with the inner side of 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) is in contact with the sliding belt (3).

4. The Pitot tube sliding seal device for high-temperature wind tunnel testing 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 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 of the sliding belt (3). 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 side of the slider (14) that rotates outward. The outer circle of the pre-tightening wheel (17) is 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) provide 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). 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 testing equipment according to claim 5, characterized in that: 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.

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

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