A pneumatic rotating annular seam injection type gas dilution device

Abstract

A pneumatic rotating annular seam-injected gas dilution device belongs to the technical field of mine safety equipment and includes a fan convergent tube, a fan divergent tube, and a cylindrical fan throat. One side of the fan throat is connected to the small end of the fan convergent tube, and the other side of the fan throat is connected to the small end of the fan divergent tube. A high-pressure gas annular chamber is provided inside the fan throat, and the high-pressure gas annular chamber is connected to an annular seam-injected nozzle facing the fan divergent tube. The fan throat is provided with a compressed gas inlet pipe connected to the high-pressure gas annular chamber, and a pneumatic rotating device is provided on the fan throat. Compressed air is used as a power source to inject air from the fan convergent tube backward through the annular seam-injected nozzle and eject it at high speed, forming a strong wind. The pneumatic rotating device rotates back and forth to achieve back-and-forth swing in the direction of the strong wind injection, which can disperse and dilute the gas without leaving any dead angles. The treatment range is large, and no electricity is used, which avoids the generation of sparks and improves the safety of underground use.

Description

Technical Field

[0001] The invention belongs to the technical field of mine safety equipment, in particular to a pneumatic rotary annular seam injection type gas dilution device. Background Art

[0002] As coal seam mining continues to deepen, the gas content in coal seams increases. Furthermore, the working face typically advances in a U-shaped, backward motion. Because gas is less dense than air, it tends to flow upward underground. Current technology typically involves extracting, draining, and releasing large-scale gas accumulations through large ventilation systems. However, due to the unique underground environment, certain gas emission blind spots still exist, such as the upper corners of the mining face, conveyor bed, and winch room. If not promptly addressed, once gas concentrations reach a certain level, there is a risk of explosion, seriously threatening mine safety and production.

[0003] To address this problem of high local gas concentrations that are difficult to discharge, localized strong ventilation is typically used to dilute the gas concentration. Existing gas dilution equipment has shortcomings: it can only draw strong air in a specific direction, failing to achieve full coverage, creating dead spots and incomplete gas control. Alternatively, adding additional gas dilution equipment to draw strong air from different angles requires significant equipment investment, consumes excessive resources, and occupies excessive underground space. Summary of the Invention

[0004] In order to solve the problem that local gas in mines is difficult to discharge today, the existing gas dilution equipment can only draw strong air in a specific direction, cannot achieve all-round coverage, easily creates dead corners, and the gas control is not thorough. The use of multiple gas dilution equipment to draw strong air from different angles requires large equipment investment, consumes too many resources, and occupies too much underground space. The present invention provides a pneumatic rotary annular seam-drawn gas dilution device.

[0005] The present invention is achieved through the following technical solutions.

[0006] A pneumatic rotating annular gap injection type gas dilution device comprises a fan convergent pipe, a fan divergent pipe and a cylindrical fan throat, wherein the fan convergent pipe and the fan divergent pipe are both trumpet-shaped, one side of the fan throat is connected to the small end of the fan convergent pipe, and the other side of the fan throat is connected to the small end of the fan divergent pipe, a high-pressure gas annular cavity is provided inside the fan throat, the high-pressure gas annular cavity is connected to an annular gap injection nozzle facing the fan divergent pipe, a compressed gas inlet pipe connected to the high-pressure gas annular cavity is provided on the fan throat, and a pneumatic rotating device is provided on the fan throat.

[0007] A further improvement of the present invention is that the above-mentioned pneumatic rotating device includes a bearing and a gear sleeved on the compressed gas inlet pipe, the outer ring of the bearing is fixedly mounted with a cylinder, the telescopic rod of the cylinder is connected to a rack parallel to the telescopic rod of the cylinder through a transmission rod, the rack is engaged with the gear, and a fixed base is provided on the cylinder.

[0008] A further improvement of the present invention is that the above-mentioned cylinder is a double-telescopic rod cylinder, the two telescopic rods of the cylinder are in opposite directions, and the ends of the two telescopic rods are respectively connected to the two ends of the rack through transmission rods.

[0009] A further improvement of the present invention is that the compressed gas inlet pipes are provided in two and are arranged opposite to each other, and the cylinder and the gear are arranged on the compressed gas inlet pipe on one side.

[0010] A further improvement of the present invention is that the large end of the fan convergent tube is connected to an air inlet collar via an air inlet flange, and the large end of the fan divergent tube is connected to an air outlet collar via an air outlet flange.

[0011] A further improvement of the present invention is that a protective sleeve is installed on the outside of the fan convergent tube and the fan divergent tube, and both ends of the protective sleeve are connected and installed through an air inlet flange and an air outlet flange respectively.

[0012] A further improvement of the present invention is that the cylinder is provided with a controller for controlling the telescopic action of the cylinder.

[0013] A further improvement of the present invention is that a throat sealing ring is provided between the fan throat and the fan tapering pipe.

[0014] From the above technical solutions, it can be seen that the beneficial effects of the present invention are: 1. By utilizing the "Venturi structure" and "Kounda effect", compressed air is used as a power source, and the compressed gas in the high-pressure gas annular cavity is ejected backward through the annular gap injection nozzle to inject the air in the fan's convergent tube. After mixing with compressed air, it is pressurized and diffused along the inner cavity of the fan's divergent tube and ejected at high speed, forming a strong wind that powerfully disperses and dilutes the gas. 2. It only uses compressed gas as the power source, not electricity, which avoids the generation of sparks and improves safety in underground use. 3. By controlling the reciprocating extension and contraction of the cylinder, the transmission rod drives the rack to move back and forth, and the rack engages the gear, driving the gear and the fan throat to swing back and forth together, realizing automatic swing of the air outlet angle, which can disperse and dilute the gas in a certain area without leaving any dead angles and covering a large treatment range. 4. The expansion and contraction amplitude and frequency of the cylinder are controlled by the controller, thereby controlling the overall swing angle and speed, which can be adjusted according to different working conditions, with a wide range of applicability and good practicality. 5. The trumpet-shaped structure of the fan's convergent and divergent tubes can draw and gather a larger air volume, increase the outlet air pressure, and increase the instantaneous air outlet area, effectively increasing the range of gas dispersion and dilution. 6. It has a simple structure, reasonable design, easy maintenance and simple implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the installation of bearings and gears according to a specific embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the fan throat structure according to a specific embodiment of the present invention.

[0019] In the attached figure: 1. Air inlet collar, 2. Air inlet flange, 3. Fan convergent pipe, 4. Fan throat, 5. Fan divergent pipe, 6. Protective sleeve, 7. Air outlet flange, 8. Air outlet collar, 9. Bearing, 10. Rack, 11. Cylinder, 12. Transmission rod, 13. Compressed gas inlet pipe, 14. Annular gap injection nozzle, 15. Controller, 16. Fixed base, 17. Gear, 18. High-pressure gas annular chamber, 19. Throat sealing ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0021] As shown in the accompanying drawings, a pneumatic rotating annular gap injection type gas dilution device includes a trumpet-shaped fan convergent pipe 3, a trumpet-shaped fan divergent pipe 5 and a cylindrical fan throat 4. The front end side of the fan throat 4 is installed and connected to the small end of the fan convergent pipe 3, and the rear end side of the fan throat 4 is installed and connected to the small end of the fan divergent pipe 5. The outer ring of the fan throat 4 is provided with an annular high-pressure gas annular cavity 18. The high-pressure gas annular cavity 18 is connected with an annular gap injection nozzle 14 facing the fan divergent pipe 5. The annular gap injection nozzle 14 is evenly distributed in an annular manner and faces backward. The fan throat 4 is provided with a compressed gas inlet pipe 13 connected with the high-pressure gas annular cavity 18, and the fan throat 4 is provided with a pneumatic rotating device. Utilizing the "Venturi structure" and the "Coanda effect," compressed air is used as a power source. The compressed gas is connected to the compressed gas inlet pipe 13. The compressed gas is then introduced backwards into the air in the fan's convergent tube 3 through the annular slit injection nozzle 14 in the high-pressure gas annular chamber 18. After mixing with the compressed air, it is pressurized and diffused along the inner cavity of the fan's divergent tube 5 and ejected at high speed, forming a strong wind that powerfully disperses and dilutes the gas. The compressed air is used as a power source to drive the pneumatic rotary device to rotate back and forth, achieving back-and-forth swinging in the direction of the strong wind injection. This can disperse and dilute the gas in a certain area, leaving no blind spots and a wide treatment range. Using only compressed air as a power source, the gas diluter can automatically rotate and swing, and inject a large amount of gas to dilute the gas. No electricity is used, which avoids the generation of sparks and improves safety in underground use. The trumpet-shaped design of the fan's convergent tube 3 can inject and gather a larger amount of air, increasing the outlet pressure; the trumpet-shaped design of the fan's divergent tube 5 can increase the instantaneous outlet area, effectively increasing the range of gas dispersion and dilution. The overall structure is simple, the injection efficiency is high and the practicability is good.

[0022] Furthermore, the pneumatic rotary device includes a bearing 9 and a gear 17 sleeved on the compressed gas inlet pipe 13. The outer ring of the bearing 9 is fixedly mounted with a cylinder 11. The telescopic rod of the cylinder 11 is connected to a rack 10 parallel to the telescopic rod of the cylinder 11 through a transmission rod 12. The rack 10 is engaged with the gear 17. A fixed base 16 is provided on the cylinder 11. The device is positioned and installed by the fixed base 16. The compressed gas is used as the power source to control the reciprocating extension and contraction of the cylinder 11. The telescopic rod of the cylinder 11 drives the rack 10 to move back and forth through the transmission rod 12. The rack 10 engages with the gear 17, driving the gear 17 to swing back and forth together with the compressed gas inlet pipe 13 and the fan throat 4, thereby realizing automatic swing of the air outlet angle. It can blow and dilute the gas in a certain area without leaving any dead angles. It has a large treatment range, a simple structure, a reasonable design, is easy to maintain, and is easy to implement.

[0023] Furthermore, the cylinder 11 is a dual-telescopic rod cylinder, with the two telescopic rods of the cylinder 11 extending in opposite directions. The ends of the two telescopic rods are connected to the ends of the rack 10 via transmission rods 12. The cylinder body 11, the two telescopic rods, the two transmission rods 12, and the rack 10 form a closed rectangular frame structure, which holds the gear 17 within. This provides a more stable structure when the telescopic rods of the cylinder 11 extend and retract, ensuring precise and tight meshing between the rack 10 and the gear 17, and ensuring reliable and stable operation.

[0024] Furthermore, the compressed gas inlet pipes 13 are provided in two positions, and are arranged opposite each other. The cylinder 11 and the gear 17 are arranged on one side of the compressed gas inlet pipe 13. The symmetrical arrangement of the two compressed gas inlet pipes 13 can balance the injection power of the annular gap injection nozzle 14, making the injection balanced and strong, and producing a strong air output.

[0025] Furthermore, the wide-open end of the fan convergent tube 3 is connected to an air inlet collar 1 via an air inlet flange 2, and the wide-open end of the fan divergent tube 5 is connected to an air outlet collar 8 via an air outlet flange 7. The air inlet collar 1 and the air outlet collar 8 stabilize and direct the airflow, allowing gas to be drawn over long distances to the return air duct, thus preventing strong winds from easily dispersing after exiting the fan divergent tube 5 and not blowing far forward.

[0026] Furthermore, a protective sleeve 6 is installed on the outside of the fan convergent pipe 3 and the fan divergent pipe 5, and the two ends of the protective sleeve 6 are respectively connected and installed through the air inlet flange 2 and the air outlet flange 7. The protective sleeve 6 effectively protects the fan convergent pipe 3, the fan divergent pipe 5 and the fan throat pipe 4 from damage due to collisions, thereby improving safety.

[0027] Furthermore, the cylinder 11 is provided with a controller 15 for controlling the extension and retraction of the cylinder 11. The controller 15 controls the extension and retraction amplitude and frequency of the cylinder 11, thereby controlling the overall swing angle and speed. The extension and retraction amplitude and frequency of the cylinder 11 can be adjusted according to different working conditions, with a wide range of applications and good practicality.

[0028] Furthermore, a throat seal ring 19 is provided between the fan throat 4 and the fan reducer 3. The fan throat 4 and the fan reducer 3 are effectively sealed to prevent air leakage at the connection between the two and ensure strong ejection power.

[0029] This pneumatic rotating annular gap injection type gas dilution device has a simple structure, reasonable design, easy maintenance and easy implementation. It uses the "Venturi structure" and "Kounda effect" to use compressed air as the power source. The compressed gas inlet pipe is connected to the compressed gas. The compressed gas in the high-pressure gas annular cavity is injected backward through the annular gap injection nozzle to inject the air in the fan's convergent pipe. After mixing with compressed air, it is pressurized and diffused along the inner cavity of the fan's gradually expanding tube, and is ejected at high speed to form a strong wind, which powerfully blows away and dilutes the gas; only compressed gas is used as the power source, and electricity is not used, which avoids the generation of sparks and improves the safety of underground use; by controlling the reciprocating extension and contraction of the cylinder, the transmission rod drives the rack to move back and forth, and the rack engages the gear, driving the gear and the fan throat to swing back and forth together, realizing automatic swing of the air outlet angle, which can blow away and dilute the gas in a certain area without leaving any dead angle, and has a large treatment range; the expansion and contraction amplitude and frequency of the cylinder are controlled by the controller, so as to control the overall swing angle and speed, and the expansion and contraction amplitude and frequency of the cylinder can be adjusted according to different working conditions, with a wide range of applicability and good practicality.

[0030] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0031] The terms "upper," "lower," "outer," "inner," and the like, if used in the present description and claims, and in the accompanying drawings, are used to distinguish relative positions and are not necessarily qualitative. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions.

[0032] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic rotating annular seam injection type gas dilution device, characterized in that: The invention comprises a fan convergent pipe (3), a fan divergent pipe (5) and a cylindrical fan throat pipe (4), wherein the fan convergent pipe (3) and the fan divergent pipe (5) are both trumpet-shaped, one side of the fan throat pipe (4) is connected to the small end of the fan convergent pipe (3), and the other side of the fan throat pipe (4) is connected to the small end of the fan divergent pipe (5), a high-pressure gas annular cavity (18) is provided inside the fan throat pipe (4), the high-pressure gas annular cavity (18) is connected to an annular gap injection nozzle (14) facing the fan divergent pipe (5), a compressed gas inlet pipe (13) connected to the high-pressure gas annular cavity (18) is provided on the fan throat pipe (4), and a pneumatic rotating device is provided on the fan throat pipe (4); The pneumatic rotating device comprises a bearing (9) and a gear (17) sleeved on a compressed gas inlet pipe (13); a cylinder (11) is fixedly mounted on the outer ring of the bearing (9); a telescopic rod of the cylinder (11) is connected to a rack (10) parallel to the telescopic rod of the cylinder (11) via a transmission rod (12); the rack (10) is meshed with the gear (17); and a fixed base (16) is provided on the cylinder (11); The cylinder (11) is a double telescopic rod cylinder, the two telescopic rods of the cylinder (11) are in opposite directions, and the ends of the two telescopic rods are respectively connected to the two ends of the rack (10) through a transmission rod (12); The compressed gas inlet pipes (13) are provided in two numbers and are arranged opposite to each other. The cylinder (11) and the gear (17) are arranged on the compressed gas inlet pipe (13) on one side.

2. The pneumatic rotating annular seam induced gas dilution device according to claim 1 is characterized in that: The large end of the fan convergent tube (3) is connected to an air inlet collar (1) via an air inlet flange (2), and the large end of the fan divergent tube (5) is connected to an air outlet collar (8) via an air outlet flange (7).

3. The pneumatic rotating annular seam induced gas dilution device according to claim 2 is characterized in that: A protective sleeve (6) is installed on the outside of the fan convergent tube (3) and the fan divergent tube (5), and the two ends of the protective sleeve (6) are connected and installed through the air inlet flange (2) and the air outlet flange (7) respectively.

4. The pneumatic rotating annular seam injection type gas dilution device according to claim 1 is characterized in that: The cylinder (11) is provided with a controller (15) for controlling the telescopic movement of the cylinder (11).

5. The pneumatic rotating annular seam injection type gas dilution device according to claim 1 is characterized in that: A throat seal ring (19) is provided between the fan throat (4) and the fan reducer (3).

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