A device for guiding air flow at a corner of a coal mine ventilation roadway

Abstract

The application provides a device for wind flow stabilization and guidance at a corner of a ventilation roadway of a coal mine, and relates to the technical field of ventilation equipment. The device comprises a bent pipe and a flow guide ring arranged in the inner side wall of the bent pipe. The adaptive flow guide structure provided by the application can inhibit vortex and reduce ventilation resistance under high-speed airflow through deformation, and can recover part of energy under low-speed state through flow channel design, so as to enhance the wind flow stability and ventilation efficiency at the corner of the roadway, adapt to different wind conditions, and improve the safety and reliability of the ventilation system.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, and more specifically, to a device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway. Background Technology

[0002] The ventilation system in coal mines is a crucial link in ensuring safe production. The layout of ventilation roadways is often constrained by geological and mining conditions, resulting in numerous bends. Currently, fixed baffles or simple airflow guiding structures are commonly used at roadway corners to direct airflow. While these devices can reduce the direct impact of airflow on the roadway walls to some extent, they generally lack the ability to precisely control airflow organization. Traditional structures struggle to adapt to the complex and variable air volume and velocity conditions underground, especially in long-distance, high-negative-pressure ventilation networks, where their flow stabilization effect is even more limited.

[0003] At bends in the tunnel, the airflow impacts the outer wall due to inertia and forms vortices, resulting in increased local resistance and significant loss of ventilation energy. At the same time, when the wind speed is too high, strong turbulence and backflow interference are easily generated, which not only reduces the effective air volume, but may also cause safety hazards such as gas accumulation and dust retention.

[0004] Therefore, we have made improvements to this and proposed a device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway. Utility Model Content

[0005] In order to achieve the above-mentioned objectives, this utility model provides a device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway, so as to improve the above-mentioned problems.

[0006] The application is as follows:

[0007] include:

[0008] Bending pipe;

[0009] A flow guide ring is disposed in the inner wall of the bent pipe. Its arc-shaped outer ring divides the bent pipe into a near ventilation channel and a far ventilation channel, which are close to and far from the bend. Its arc-shaped inner ring and the inner wall of the bent pipe form a cavity with a wide-narrow-wide distribution along the bending path. The flow guide ring has a narrow distribution forming a recessed part of the arc-shaped outer ring of the flow guide ring on the side close to the near ventilation channel.

[0010] The guide ring is provided with a fixing post at both ends, and the fixing post is fixedly connected to the inner wall of the bent tube.

[0011] The moving columns are spaced apart in the widely distributed cavity of the guide ring and contact the arc-shaped inner ring of the guide ring. Each of the circular surfaces of the moving columns is provided with balls that contact the inner wall of the bent tube. A spring is provided between the two moving columns.

[0012] When the high-pressure airflow presses against the recessed part, the moving column moves the head and tail ends of the guide ring, and forces the guide ring to press against the inner wall of the bent tube to form a linear protrusion on the arc-shaped outer ring of the guide ring.

[0013] Preferably, the beginning and end of the flow guide ring are triangularly distributed.

[0014] Preferably, the spring, when not under stress, follows the same bending direction as the bent portion of the bent tube.

[0015] Preferably, when the moving column moves in the direction of the guide ring, the spring stretches and abuts against the recess.

[0016] Preferably, the two ends of the fixed column are located on the diameter that bisects the ventilation path of the bent pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In the scheme of this application:

[0019] To address the problems in the prior art, this application utilizes an adaptive flow guiding structure to suppress eddies and reduce ventilation resistance through deformation under high-speed airflow, and to recover some energy through flow channel design under low-speed conditions. This enhances the stability of airflow and ventilation efficiency at roadway corners, adapts to different air volume conditions, and improves the safety and reliability of the ventilation system. Attached Figure Description

[0020] Figure 1 The front view of a device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway provided in this application;

[0021] Figure 2 A schematic diagram of the internal structure of a device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway, provided in this application;

[0022] Figure 3 An enlarged view of point A of a device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway, provided in this application.

[0023] The image shows:

[0024] 1. Bending tube; 2. Guide ring; 21. Recessed part; 3. Fixed column; 4. Moving column; 5. Ball bearing; 6. Spring. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of 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 should fall within the protection scope of the present invention.

[0026] For an example, please refer to... Figure 1 , Figure 2 and Figure 3 A device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway, comprising:

[0027] Bending pipe 1;

[0028] The flow guide ring 2 is disposed in the inner wall of the bent pipe 1. Its arc-shaped outer ring divides the bent pipe 1 into a near ventilation channel and a far ventilation channel near the bend and away from the bend. Its arc-shaped inner ring and the inner wall of the bent pipe 1 form a cavity with a wide-narrow-wide distribution along the bend path. The flow guide ring 2 has a narrow distribution forming a recess 21 of the arc-shaped outer ring of the flow guide ring 2 near the near ventilation channel.

[0029] The guide ring 2 is equipped with a fixing post 3 at both ends, and the fixing post 3 is fixedly connected to the inner wall of the bent pipe 1;

[0030] The moving column 4 is spaced apart in the widely distributed cavity of the guide ring 2 and contacts the arc-shaped inner ring of the guide ring 2. Each of its circular surfaces is provided with ball bearings 5 ​​that contact the inner wall of the bent tube 1. A spring 6 is provided between the two moving columns 4.

[0031] When the high-pressure airflow presses the recessed part 21, the moving column 4 moves the head and tail ends of the guide ring 2, and forces the guide ring 2 to press the inner wall of the bent pipe 1 to form a linear protrusion on the arc-shaped outer ring of the guide ring 2.

[0032] When the high-pressure airflow enters the corner area of ​​the bend in the pipe 1, it first impacts the recess 21 on the guide ring 2 near the ventilation duct side. The pressure of the airflow forces the guide ring 2 to undergo slight deformation, and its arc-shaped inner ring then exerts a lateral thrust on the contacting moving column 4.

[0033] After being thrust, the moving column 4 rolls along the inner arc of the guide ring 2. The balls 5 on its surface contact the inner wall of the bent tube 1, significantly reducing frictional resistance and allowing the moving column 4 to move smoothly to both ends of the guide ring 2. At the same time, the spring 6 connecting the two moving columns 4 is stretched, accumulating elastic restoring force. This process not only buffers the airflow impact but also provides conditions for subsequent structural repositioning.

[0034] As the moving column 4 moves, the guide ring 2 is subjected to a reverse force, and its arc-shaped outer ring gradually presses against the inner wall of the bent pipe 1, thus forming a continuous and smooth linear protrusion. This protrusion covers the far ventilation duct away from the bend, causing the airflow passing through this part to be guided to the inner wall of the bent pipe 1 and hindering the subsequent airflow, thereby weakening the overall air intake effect.

[0035] When the low-pressure airflow passes through the device, the internal moving column 4 and spring 6 structure are not activated due to insufficient pressure exerted by the airflow on the recess 21 of the guide ring 2, thus the guide ring 2 maintains its initial static profile. At this time, the airflow is naturally divided into two streams by the arc-shaped outer ring of the guide ring 2, which pass through the near ventilation channel and the far ventilation channel respectively.

[0036] After flowing independently and smoothly along the inner wall of the bend tube 1, the two airflows eventually converge again at the outlet of the device. The key is that the design of the end of the guide ring 2 and the cavity structure formed with the inner wall of the bend tube 1 make the outlet cross-section of the two channels converge.

[0037] When two airflows converge here, the cross-sectional area of ​​the flow channel first decreases and then increases. After the wind passes through, some of the pressure loss is recovered, and the Venturi effect compensates for the basic energy loss caused by inertia and friction during the bend of the airflow.

[0038] It should be added that the above descriptions of the flow guide ring 2 are all based on the windward side of the flow guide ring 2 and the leeward side.

[0039] The guide ring 2 has a triangular distribution at both ends, which reduces the energy loss of airflow on the guide ring 2, and the triangular guide ring 2 at the tail end can provide elastic force for the moving column 4 to return to its initial state.

[0040] When the spring 6 is not under force, it bends in the same direction as the bent part of the bent tube 1.

[0041] When the moving column 4 moves in the direction of the head and tail of the guide ring 2, the spring 6 stretches and abuts against the recess 21, relieving the pressure on the recess 21 of the guide ring 2.

[0042] The two ends of the fixed column 3 are located on the diameter of the ventilation path of the bend pipe 1, which divides the ventilation path of the bend pipe 1 at equal intervals.

[0043] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway, characterized in that, include: Bending pipe; A flow guide ring is disposed in the inner wall of the bent pipe. Its arc-shaped outer ring divides the bent pipe into a near ventilation channel and a far ventilation channel, which are close to and far from the bend. Its arc-shaped inner ring and the inner wall of the bent pipe form a cavity with a wide-narrow-wide distribution along the bending path. The flow guide ring has a narrow distribution forming a recessed part of the arc-shaped outer ring of the flow guide ring on the side close to the near ventilation channel. The guide ring is provided with a fixing post at both ends, and the fixing post is fixedly connected to the inner wall of the bent tube. The moving columns are spaced apart in the widely distributed cavity of the guide ring and contact the arc-shaped inner ring of the guide ring. Each of the circular surfaces of the moving columns is provided with balls that contact the inner wall of the bent tube. A spring is provided between the two moving columns. When the high-pressure airflow presses against the recessed part, the moving column moves the head and tail ends of the guide ring, and forces the guide ring to press against the inner wall of the bent tube to form a linear protrusion on the arc-shaped outer ring of the guide ring.

2. The device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway according to claim 1, characterized in that, The flow guide ring has a triangular distribution at both ends.

3. The device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway according to claim 2, characterized in that, When the spring is not under force, it bends in the same direction as the bent portion of the bent tube.

4. The device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway according to claim 3, characterized in that, When the moving column moves in the direction of the guide ring, the spring stretches and abuts against the recess.

5. The device for stabilizing and guiding airflow at the corner of a coal mine ventilation roadway according to claim 4, characterized in that, The two ends of the fixed column are located on the diameter that bisects the ventilation path of the bend pipe.

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