Dynamic pressure sensing device for mine fan drift

Abstract

The utility model belongs to the technical field of coal mine gas emission detection, and discloses a dynamic pressure sensing device for a mine fan drift, which comprises a dynamic pressure sensor, a dynamic pressure transmitter, an upper computer and the like. The dynamic pressure sensor is arranged on a dynamic pressure measuring point reserved in a mine fan drift, the dynamic pressure sensor comprises two pitot tubes, sampling ports of the two pitot tubes face downwards, the sampling port of one pitot tube is arranged in the windward direction, and the sampling port of the other pitot tube is arranged in the leeward direction. The two pitot tubes can be used for respectively measuring the vertical flow direction pressure and the facing direction pressure of the wind at the dynamic pressure measuring point position, then the dynamic pressure is calculated through the two pressure differences, and then the wind volume of the wind in the mine fan drift is obtained through calculation. Due to the fact that the pitot tube is installed in a unique downward mode, the influence of dust on measurement of the sensor can be prevented, self-drainage can be carried out, the dynamic pressure sensor is prevented from being blocked, meanwhile, the trouble of manual cleaning is omitted, and cleaning construction safety and personal safety of construction workers are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine gas emission detection technology, and relates to a dynamic pressure sensing device for mine ventilation shafts. Background Technology

[0002] Coal formation and metamorphism produce gases such as carbon monoxide, carbon dioxide, and methane. Therefore, coal mines need to accurately monitor the generation and emission of these gases during production.

[0003] To accurately measure carbon emissions from coal mine ventilation shafts, it is necessary to first simultaneously and accurately measure the concentration of each carbon gas within the ventilation shaft and the air volume of the ventilation shaft, and then accurately calculate the amount of carbon gas emitted from the coal mine using formulas.

[0004] Currently, there are two traditional methods for measuring the air volume in a wind tunnel: one is the direct method, which involves directly measuring the air volume by placing wind speed sensors at various points and then calculating the wind speed; the other is to install ultrasonic sensors in the same duct to detect the wind speed.

[0005] However, due to factors such as high dust concentration and high humidity in the return airflow, the sensors of the two measuring devices mentioned above are often clogged, requiring frequent manual cleaning, which compromises the safety of the cleaning process and the personal safety of the workers. Utility Model Content

[0006] The purpose of this invention is to provide a dynamic pressure sensing device for mine ventilation shafts. This device accurately obtains the air volume of the ventilation shaft by measuring the vertical flow pressure and the frontal pressure of the wind at the location of the dynamic pressure measuring point.

[0007] To achieve the above objectives, this utility model adopts the following technical solution:

[0008] A dynamic pressure sensing device for a mine ventilation shaft includes a dynamic pressure sensor, a dynamic pressure transmitter, and a host computer; wherein one or more sets of dynamic pressure sensors are provided; the dynamic pressure sensors are arranged at reserved dynamic pressure measurement points inside the mine ventilation shaft;

[0009] Each set of dynamic pressure sensors includes two pitot tubes, both of which are installed back-to-back facing downwards, with the sampling ports of the pitot tubes facing downwards. The sampling port of one pitot tube is arranged facing the wind, and the sampling port of the other pitot tube is arranged facing away from the wind.

[0010] The two pitot tubes are each connected to a data acquisition port of the dynamic pressure transmitter via an independent bundle tube;

[0011] The dynamic pressure transmitter is located outside the mine ventilation shaft and is connected to the host computer.

[0012] Preferably, there are multiple dynamic pressure measurement points, and each dynamic pressure measurement point is located within the same wind tunnel section;

[0013] The same wind tunnel section is divided into multiple dynamic pressure measurement areas, and each dynamic pressure measurement point is located at the center of its respective dynamic pressure measurement area; the two sampling ports of each dynamic pressure sensor are located at the corresponding dynamic pressure measurement point.

[0014] Preferably, the dynamic pressure sensing device for mine ventilation shafts further includes a dynamic pressure sensor bracket; wherein, the dynamic pressure sensor bracket is vertically installed at a certain cross-section of the mine ventilation shaft, and the dynamic pressure sensor is installed on the dynamic pressure sensor bracket.

[0015] Preferably, the dynamic pressure sensor bracket is a mesh structure formed by the cross connection of several transverse mounting rods and longitudinal mounting rods, wherein the size of the mesh structure is adapted to the size of the cross section of the wind tunnel, and the edge of the mesh structure is fixed to the wall of the wind tunnel.

[0016] Preferably, the grid area formed by the cross connection of the horizontal mounting rod and the vertical mounting rod is the dynamic pressure measurement area; wherein each group of dynamic pressure sensors is installed at the top center of the corresponding grid area, and its sampling port extends to the center of the grid area.

[0017] Preferably, the dynamic pressure sensor is mounted on the dynamic pressure sensor bracket by a dynamic pressure sensor fixing device; the dynamic pressure sensor fixing device includes an upper sensor fixing groove and a lower Pitot tube mounting plate;

[0018] The upper sensor fixing slot is installed on the horizontal mounting rod of the dynamic pressure sensor bracket and fastened.

[0019] The lower Pitot tube mounting plate is connected to the bottom of the upper sensor fixing slot and is vertically arranged; the surface of the lower Pitot tube mounting plate is arranged in a direction consistent with the airflow inside the mine ventilation shaft.

[0020] In each group of dynamic pressure sensors, the two Pitot tubes are mounted on the same surface of the lower Pitot tube mounting plate.

[0021] Preferably, the cross-section of the upper sensor fixing groove is a horizontally arranged U-shape;

[0022] The upper sensor mounting slot is inserted into the horizontal mounting rod of the dynamic pressure sensor bracket and secured with bolts.

[0023] Preferably, the Pitot tube is mounted on the lower Pitot tube mounting plate by one or more fasteners and secured with bolts; wherein the fasteners are U-shaped and simultaneously secure two Pitot tubes.

[0024] Preferably, the mine ventilation shaft dynamic pressure sensing device further includes a cluster penetration protection device; wherein, the cluster penetration protection device is installed on the ventilation shaft wall, with one end connected to the outside of the ventilation shaft and the other end connected to the inside of the ventilation shaft;

[0025] The bundle tube connecting the pitot tube and the dynamic pressure transmitter passes through the bundled tunnel protection device.

[0026] Preferably, the cluster penetration protection device includes an input cover, an output cover, and a cluster penetration pipe; wherein the input cover and the output cover are respectively connected to one end of the cluster penetration pipe and are located inside and outside the wind tunnel, respectively, and the cluster penetration pipe penetrates the wind tunnel wall.

[0027] The cross-sectional dimensions of both the input and output covers are larger than those of the bundled tunnel tube;

[0028] Both ends of the bundled tube are fitted with mesh plates for the bundled tube to pass through, and the bundled tube passes through the holes in the mesh plates.

[0029] This utility model has the following advantages:

[0030] As described above, this utility model relates to a dynamic pressure sensing device for mine ventilation shafts, comprising a dynamic pressure sensor, a dynamic pressure transmitter, and a host computer. The dynamic pressure sensor is arranged at a pre-reserved dynamic pressure measurement point within the mine ventilation shaft, and uses two pitot tubes as two measuring elements. The sampling ports of the two pitot tubes face downwards, with one pitot tube's sampling port positioned facing the wind and the other facing away from the wind. The two pitot tubes can measure the vertical airflow pressure and the frontal pressure at the dynamic pressure measurement point, respectively. The dynamic pressure is then calculated using the pressure difference between the two pressures, and the airflow volume within the mine ventilation shaft is accurately calculated. Due to the unique downward installation method of the pitot tubes used in this utility model, dust can be prevented from affecting the sensor measurement, and self-draining is possible, avoiding clogging of the dynamic pressure sensor and eliminating the hassle of manual cleaning, thus ensuring the safety of cleaning operations and the personal safety of construction workers. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the dynamic pressure sensing device for a mine ventilation shaft in an embodiment of this utility model;

[0032] Figure 2 for Figure 1 Enlarged view of part A in the image;

[0033] Figure 3 This is a schematic diagram of the dynamic pressure sensor fixing device in the embodiment of the present invention; wherein (a) is a front view of the Pitot tube installation; (b) is a side view of the Pitot tube installation; and (c) is a rear view of the Pitot tube installation.

[0034] Figure 4 This is a schematic diagram of the structure of the bundled tunnel protection device in an embodiment of this utility model;

[0035] Figure 5 This is a schematic diagram of the mesh plate in an embodiment of the present invention.

[0036] Among them, 1-dynamic pressure sensor, 2-dynamic pressure transmitter, 3-pitotube, 4-dynamic pressure sensor bracket, 5-grid area, 6-dynamic pressure sensor fixing device, 7-upper sensor fixing groove, 8-lower pitot tube mounting plate;

[0037] 9-Horizontal mounting rod, 10-Longitudinal mounting rod, 11-Fixed component, 12-Bulk tunnel protection device, 13-Input cover, 14-Output cover, 15-Bulk tunnel tube, 16-Mesh plate, 17-Mesh hole, 18-Air chamber wall, 19-Bulk tube. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0039] Example

[0040] like Figure 1 As shown in the figure, this embodiment describes a dynamic pressure sensing device for a mine ventilation shaft. The dynamic pressure sensing device for a mine ventilation shaft includes a dynamic pressure sensor 1, a dynamic pressure transmitter 2, and a host computer (not shown in the figure).

[0041] Among them, dynamic pressure sensor 1 is used to collect dynamic pressure sensing data and transmit the collected dynamic pressure sensing data to dynamic pressure transmitter 2. Dynamic pressure transmitter 2 further transmits the received information to the host computer.

[0042] In this embodiment, one or more sets of dynamic pressure sensors 1 are provided, and each set of dynamic pressure sensors 1 is arranged at a reserved dynamic pressure measurement point inside the mine ventilation shaft. For example... Figure 2 The illustration shows a scenario where multiple sets of dynamic pressure sensors 1 are arranged inside a mine ventilation shaft.

[0043] In this embodiment, the dynamic pressure sensor 1 uses a Pitot tube 3 as the dynamic pressure measurement sensor. Each set of dynamic pressure sensors includes two Pitot tubes 3, which respectively measure the total pressure and static pressure. The dynamic pressure can be calculated by measuring the normal force and lateral pressure of the fluid, and then the air volume in the mine ventilation shaft can be accurately calculated.

[0044] The dynamic pressure transmitter 2 has two acquisition ports. The two Pitot tubes 3 in the same group of dynamic pressure sensors 1 are connected to one acquisition port of the dynamic pressure transmitter 2 through an independent bundle tube.

[0045] The two pitot tubes 3 transmit the collected information to the dynamic pressure transmitter 2 through their respective bundle tubes.

[0046] Both pitot tubes 3 are installed back-to-back facing downwards, meaning the sampling ports of the pitot tubes 3 face downwards. One pitot tube 3 has its sampling port facing the wind, while the other pitot tube 3 has its sampling port facing away from the wind. Figure 2 and Figure 3 As shown.

[0047] This arrangement prevents dust from affecting the dynamic pressure sensor 1 and allows for self-drainage, avoiding blockage of the dynamic pressure sensor. It also eliminates the hassle of manual cleaning, ensuring the safety of cleaning operations and the personal safety of construction workers.

[0048] Among them, the dynamic pressure transmitter 2 is located outside the mine ventilation shaft and is connected to the host computer.

[0049] In this embodiment, the dynamic pressure transmitter 2 is preferably located at the upper part outside the mine ventilation shaft, such as... Figure 1 As shown, close-range installation prevents pressure data loss caused by long-distance bundled tube transmission. Alternatively, it can be located on the side outside the mine ventilation shaft.

[0050] like Figure 1 As shown, there are multiple dynamic pressure measurement points, and all of them are located within the same wind tunnel section.

[0051] Specifically, the same wind tunnel section is divided into multiple dynamic pressure measurement areas, and each dynamic pressure measurement point is located at the center of its respective dynamic pressure measurement area; the two sampling ports of each dynamic pressure sensor 2 are located at the corresponding dynamic pressure measurement points.

[0052] Within the same cross section of the wind tunnel, the wind speed can be considered to be uniform within a very close range. Therefore, this invention divides the same cross section of the wind tunnel into multiple parts, and the dynamic pressure of each part is calculated by measuring the dynamic pressure of a dynamic pressure sensor 1.

[0053] By arranging multiple points in the cross-section of the wind tunnel for dynamic pressure measurement, the cross-sectional wind speed at the same moment can be accurately measured.

[0054] In addition, the device also includes a dynamic pressure sensor bracket 4 to fix and support the dynamic pressure sensor 1.

[0055] like Figure 1 As shown, the dynamic pressure sensor bracket 4 is vertically installed at a certain cross section of the mine ventilation shaft, and each dynamic pressure sensor 1 is installed at the corresponding position on the dynamic pressure sensor bracket 4.

[0056] The dynamic pressure sensor bracket 4 is a mesh structure formed by the cross connection of several transverse mounting rods 9 and longitudinal mounting rods 10. The size of the mesh structure is adapted to the size of the cross section of the wind tunnel, and the edge of the mesh structure is fixed to the wind tunnel wall 18.

[0057] Both the horizontal and vertical mounting rods are made of steel bars, which are welded together to form the aforementioned mesh structure.

[0058] For example, mounting blocks can be welded to the ends of the horizontal mounting rod 9 and the longitudinal mounting rod 10, and mounting holes can be provided on the mounting blocks. Expansion bolt holes are pre-embedded in the mine ventilation shaft at the positions corresponding to each mounting block.

[0059] The dynamic pressure sensor bracket 4 is installed by bolts passing through the various mounting holes and corresponding expansion bolt holes. Because the dynamic pressure sensor bracket 4 uses a mesh structure, it will not affect the airflow inside the ventilation shaft.

[0060] The grid area 5, formed by the intersection of horizontal and vertical mounting rods, is the dynamic pressure measurement area. Each set of dynamic pressure sensors 2 is installed at the top center of the corresponding grid area, with its sampling port extending to the center of the grid area.

[0061] like Figure 3 As shown, the dynamic pressure sensor 1 is mounted on the dynamic pressure sensor bracket 4 via the dynamic pressure sensor fixing device 6; the dynamic pressure sensor fixing device 6 includes an upper sensor fixing groove 7 and a lower Pitot tube mounting plate 8.

[0062] The upper sensor fixing slot 7 is installed on the horizontal mounting rod 9 of the dynamic pressure sensor bracket 4 and fastened.

[0063] In this embodiment, the cross-section of the upper sensor fixing groove 7 is a horizontally arranged U-shape.

[0064] The upper sensor fixing groove 7 is formed, for example, by bending a straight plate twice at right angles. Mounting holes are provided on the two horizontal plates that are opposite each other to realize the installation and fixing of the dynamic pressure sensor bracket 4.

[0065] After the upper sensor fixing slot 7 is inserted into the horizontal mounting rod 9 of the dynamic pressure sensor bracket, it is tightened with bolts.

[0066] The lower pitot tube mounting plate 8 is connected to the bottom of the upper sensor fixing slot 7 and is vertically positioned.

[0067] In this embodiment, the lower Pitot tube mounting plate 8 is a mounting plate, and the surface of the lower Pitot tube mounting plate 8 is arranged in a direction consistent with the airflow inside the mine ventilation shaft, such as... Figure 1 and Figure 2 As shown.

[0068] Both pitot tubes 3 of each set of dynamic pressure sensors are mounted on the same surface of the lower pitot tube mounting plate 8. This arrangement ensures that after the dynamic pressure sensor bracket 4 is fixed, one sampling port faces the wind and the other sampling port is sheltered from the wind.

[0069] like Figure 3 As shown in (a) and (b), the two Pitot tubes 3 can be connected together, for example by welding. After the two Pitot tubes are combined, the end connected to the bundle tube is located at the upper end of each Pitot tube.

[0070] The Pitot tube 3 is mounted on the lower Pitot tube mounting plate 8 by one or more fasteners 11 and fastened with bolts; wherein the fasteners 11 are, for example, in the shape of a "U" and simultaneously fasten two Pitot tubes 3.

[0071] This fixing method ensures that the sampling ports of the two Pitot tubes 3 are placed back to back to collect data from the same location.

[0072] Furthermore, since the dynamic pressure transmitter 2 is located outside the mine ventilation shaft, a bundled tube connecting to the pitot tube 3 needs to be designed with a special protection device 12 to ensure that the bundled tube penetrates the ventilation shaft wall without leaking air. Figure 4 As shown.

[0073] The bundled tunnel protection device 12 is installed on the wall 18 of the air tunnel, with one end connected to the outside of the air tunnel and the other end connected to the inside of the air tunnel; the bundled tube connecting the pitot tube and the dynamic pressure transmitter passes through the bundled tunnel protection device 12.

[0074] The cluster tunnel protection device includes an input cover 13, an output cover 14, and a cluster tunnel pipe 15; wherein, the input cover 13 and the output cover 14 are respectively connected to one end of the cluster tunnel pipe 15 and are located inside and outside the wind tunnel respectively.

[0075] The bundled through-tube 15 penetrates the wall of the ventilation duct. Specifically, a through-hole with a diameter adapted to the bundled through-tube 15 is pre-drilled in the wall of the ventilation duct. This through-hole of the bundled through-tube 15 penetrates the entire wall 18 of the ventilation duct. Figure 1 As shown.

[0076] After the clustering tube 15 is passed through the perforation of the clustering tube, one end is connected to the input cover 13 and the other end is connected to the output cover 14. The cross-sectional dimensions of the input cover 13 and the output cover 14 are both larger than the cross-sectional dimensions of the clustering tube 15.

[0077] Both ends of the bundled tube 15 (i.e., the end inside the ventilation shaft and the end outside the ventilation shaft) are fitted with mesh plates 16 for the bundled tube to pass through. These mesh plates are covered with mesh holes 17. Figure 5 As shown.

[0078] The mesh plate 16 is integrally connected to the inner wall of the bundled through-tube 15 by means of welding, for example. The bundle tubes 19 led out from each group of dynamic pressure sensors 1 pass through the mesh holes 17 on the mesh plate and are connected to the dynamic pressure transmitter 2.

[0079] The main function of the dynamic pressure transmitter 2 is to transmit the information measured by the pitot tube 3 to the host computer via dynamic pressure.

[0080] The bundled tube protection device has two functions: first, to ensure that the air chamber wall 18 does not leak air, and second, to protect and organize the bundled tubes 19 so that they are not flattened during gluing or fixing, thus preventing them from being undetectable, and also preventing multiple hoses from squeezing each other together.

[0081] This invention divides the entire cross-section of a mine ventilation shaft into multiple small measuring sections. By measuring the dynamic pressure of each small section using a set of dynamic pressure sensors 1, the accurate air volume of the entire ventilation shaft cross-section can be obtained.

[0082] Let P be the vertical airflow pressure at the i-th measuring point. ic The pressure is P. iy Then the dynamic pressure P id The calculation method is as follows:

[0083] ;

[0084] Where i is the number of the dynamic pressure sensor measurement point, i=1,2,3……n, and n is the total number of dynamic pressure measurement sensors.

[0085] The uniform wind speed within the small cross-section of the measurement point is:

[0086] .

[0087] in Let the air density at the measurement point be denoted as . The overall flow rate of the ventilation shaft can then be calculated using the following formula:

[0088] .

[0089] in S represents the total flow rate of the ventilation shaft, and S represents the total cross-sectional area of ​​the ventilation shaft at the measurement point.

[0090] In this invention, when arranging the dynamic pressure sensor pitot tube 3, each pitot tube 3 has a sampling port, and the two sampling ports of the same dynamic pressure sensor are installed back to back, one sampling the pressure perpendicular to the flow direction and the other sampling the pressure facing the flow direction.

[0091] When measuring vertical flow pressure, to prevent dust and water from clogging the vertical flow pressure sampling port due to prolonged exposure to the wind tunnel, the vertical flow Pitot tube is installed leeward and downward. Figure 3 As shown in (a).

[0092] This arrangement allows for both vertical pressure measurement and prevention of dust clogging the sensor, as well as drainage.

[0093] This invention effectively prevents dust from affecting sensor measurements and also allows for self-drainage, avoiding blockage of the dynamic pressure sensor. It also eliminates the hassle of manual cleaning, ensuring the safety of cleaning operations and the personal safety of construction workers.

[0094] Of course, the above description is only a preferred embodiment of the present utility model. The present utility model is not limited to the above-described embodiments. It should be noted that any equivalent substitutions or obvious modifications made by those skilled in the art under the guidance of this specification fall within the scope of this specification and should be protected by the present utility model.

Claims

1. A dynamic pressure sensing device for a mine ventilation shaft, characterized in that, It includes a dynamic pressure sensor, a dynamic pressure transmitter, and a host computer; the dynamic pressure sensor is provided in one or more sets; The dynamic pressure sensor is arranged at the dynamic pressure measurement point reserved in the mine ventilation shaft; Each set of dynamic pressure sensors includes two pitot tubes, both of which are installed back-to-back facing downwards, with the sampling ports of the pitot tubes facing downwards. The sampling port of one pitot tube is arranged facing the wind, and the sampling port of the other pitot tube is arranged facing away from the wind. Each of the two pitot tubes is connected to a data acquisition port of the dynamic pressure transmitter via an independent bundle tube; The dynamic pressure transmitter is located outside the mine ventilation shaft and is connected to the host computer.

2. The mine ventilation shaft dynamic pressure sensing device according to claim 1, characterized in that, There are multiple dynamic pressure measurement points, and each dynamic pressure measurement point is located within the same wind tunnel section; The same wind tunnel section is divided into multiple dynamic pressure measurement areas, and each dynamic pressure measurement point is located at the center of its respective dynamic pressure measurement area; the two sampling ports of each dynamic pressure sensor are located at the corresponding dynamic pressure measurement point.

3. The mine ventilation shaft dynamic pressure sensing device according to claim 2, characterized in that, The mine ventilation shaft dynamic pressure sensing device also includes a dynamic pressure sensor bracket; wherein, the dynamic pressure sensor bracket is vertically installed at a certain cross section of the mine ventilation shaft, and the dynamic pressure sensor is installed on the dynamic pressure sensor bracket.

4. The mine ventilation shaft dynamic pressure sensing device according to claim 3, characterized in that, The dynamic pressure sensor bracket is a mesh structure formed by the cross connection of several horizontal and vertical mounting rods. The size of the mesh structure is adapted to the size of the cross section of the wind tunnel, and the edges of the mesh structure are fixed to the wall of the wind tunnel.

5. The mine ventilation shaft dynamic pressure sensing device according to claim 4, characterized in that, The grid area formed by the cross connection of horizontal and vertical mounting rods is the dynamic pressure measurement area; each set of dynamic pressure sensors is installed at the top center of the corresponding grid area, and its sampling port extends to the center of the grid area.

6. The mine ventilation shaft dynamic pressure sensing device according to claim 4 or 5, characterized in that, The dynamic pressure sensor is mounted on the dynamic pressure sensor bracket by a dynamic pressure sensor fixing device; the dynamic pressure sensor fixing device includes an upper sensor fixing groove and a lower Pitot tube mounting plate; The upper sensor fixing slot is installed on the horizontal mounting rod of the dynamic pressure sensor bracket and fastened. The lower Pitot tube mounting plate is connected to the bottom of the upper sensor fixing slot and is vertically arranged; the surface of the lower Pitot tube mounting plate is arranged in a direction consistent with the airflow inside the mine ventilation shaft. In each group of dynamic pressure sensors, the two Pitot tubes are mounted on the same surface of the lower Pitot tube mounting plate.

7. The mine ventilation shaft dynamic pressure sensing device according to claim 6, characterized in that, The cross-section of the upper sensor fixing groove is a horizontally arranged U-shape; The upper sensor mounting slot is inserted into the horizontal mounting rod of the dynamic pressure sensor bracket and secured with bolts.

8. The mine ventilation shaft dynamic pressure sensing device according to claim 6, characterized in that, The Pitot tube is mounted on the lower Pitot tube mounting plate by one or more fasteners and secured with bolts; wherein the fasteners simultaneously secure two Pitot tubes.

9. The mine ventilation shaft dynamic pressure sensing device according to claim 1, characterized in that, The mine ventilation shaft dynamic pressure sensing device also includes a cluster penetration protection device; wherein, the cluster penetration protection device is installed on the ventilation shaft wall, with one end connected to the outside of the ventilation shaft and the other end connected to the inside of the ventilation shaft; The bundle tube connecting the pitot tube and the dynamic pressure transmitter passes through the bundle penetration protection device.

10. The mine ventilation shaft dynamic pressure sensing device according to claim 9, characterized in that, The cluster penetration protection device includes an input cover, an output cover, and a cluster penetration pipe; wherein, the input cover and the output cover are respectively connected to one end of the cluster penetration pipe and are located inside and outside the wind tunnel, respectively, and the cluster penetration pipe penetrates through the wind tunnel wall. The cross-sectional dimensions of both the input and output covers are larger than those of the bundled tunnel tube; Both ends of the bundled tube are fitted with mesh plates for the bundled tube to pass through, and the bundled tube passes through the holes in the mesh plates.

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