A pneumatic fire extinguishing device for coal mines

Abstract

This utility model discloses a pneumatic fire extinguishing device for coal mines, relating to the field of coal mine fire extinguishing equipment. It includes a powder storage tank, a suspension assembly at the top of the powder storage tank, and a powder spraying structure at the bottom of the powder storage tank. It also includes a triggering structure positioned between the powder spraying structure and the powder storage tank, with a shielding structure surrounding the triggering structure. This pneumatic fire extinguishing device for coal mines, by setting up a shielding structure, can shield the complex electromagnetic radiation field underground in coal mines, ensuring the reliability of electromagnetic triggering and guaranteeing the fire extinguishing effect.

Description

Technical Field

[0001] This utility model relates to the field of coal mine fire extinguishing equipment, specifically a coal mine pneumatic fire extinguishing device. Background Technology

[0002] In the process of coal mining, underground fires are a major hidden danger to safe production. As an important active protection device, pneumatic fire extinguishing devices must have reliable triggering performance and stable powder spraying effect to adapt to the complex underground environment.

[0003] Electromagnetic trigger-type suspended fire extinguishing devices are typically activated quickly via an electromagnetic actuator, releasing the extinguishing agent within seconds to effectively control the spread of fire. However, underground coal mines contain equipment such as high-voltage motors and coal mining machines, which generate complex electromagnetic radiation fields. Conventional electromagnetic trigger modules have weak anti-interference capabilities and are prone to false triggering when there is no fire or failure to trigger when there is a fire.

[0004] Therefore, this application is hereby submitted. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatic fire extinguishing device for coal mines. This device, by setting up a shielding structure, can shield the complex electromagnetic radiation field underground in coal mines, ensuring the reliability of electromagnetic triggering and guaranteeing the fire extinguishing effect.

[0006] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a coal mine pneumatic fire extinguishing device, including a powder storage tank; A suspension assembly, wherein the suspension assembly is disposed on the top of the powder storage tank; A powder spraying structure is provided at the bottom of the powder storage tank; It also includes a triggering structure, which is disposed between the powder spraying structure and the powder storage tank; A shielding structure is provided, which surrounds the triggering structure.

[0007] In some embodiments, the triggering structure includes a trigger frame, which is connected to the powder spraying structure; An electromagnetic actuator is located on the side of the trigger frame away from the powder spraying structure; and the electromagnetic actuator is provided with the shielding structure. A puncture needle, which is connected to the electromagnetic actuator.

[0008] In some embodiments, the shielding structure includes a high-frequency shielding cover surrounding the electromagnetic driver and grounded; A low-frequency shielding cover is disposed between the high-frequency shielding cover and the electromagnetic driver, and the low-frequency shielding cover is electrically connected to the high-frequency shielding cover.

[0009] In some embodiments, the low-frequency shield is made of permalloy, and the high-frequency shield is made of copper mesh.

[0010] In some embodiments, the powder spraying structure includes a container valve, which is located at the bottom of the powder storage tank, and the triggering structure is provided on one side of the container valve; A nozzle is located at the bottom of the container valve.

[0011] In some embodiments, a pressure gauge is also included, which is connected to the container valve.

[0012] In some embodiments, a pressure sensor is also included, which is connected to the container valve.

[0013] In some embodiments, the suspension assembly includes a plurality of connecting rods, which are arranged in a ring around the top of the powder storage tank; A suspension ring is disposed at the top of the plurality of connecting rods.

[0014] In summary, this utility model has the following beneficial effects: This type of pneumatic fire extinguishing device for coal mines uses a double-layer shielding structure consisting of a high-frequency shield and a low-frequency shield to shield the complex electromagnetic radiation field underground in coal mines, completely isolate high-frequency and low-frequency electromagnetic interference underground, reduce the false triggering rate of electromagnetic actuators, ensure that it only operates in the event of a fire, and ensure the fire extinguishing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the trigger structure and the shielding structure of this utility model.

[0016] In the diagram: 1. Powder storage tank; 2. Suspension assembly; 21. Connecting rod; 22. Suspension ring; 3. Powder spraying structure; 31. Container valve; 32. Nozzle; 4. Triggering structure; 41. Trigger frame; 42. Electromagnetic actuator; 5. Shielding structure; 51. High-frequency shielding cover; 52. Low-frequency shielding cover; 6. Pressure gauge; 7. Pressure sensor. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] refer to Figure 1-2 A pneumatic fire extinguishing device for coal mines includes a powder storage tank 1, a suspension assembly 2, a powder spraying structure 3, a triggering structure 4, and a shielding structure 5. The powder storage tank 1 can be made of 304 stainless steel and can store extinguishing agents such as dry powder required for fire extinguishing. It maintains the preset air pressure (0.8-1.2MPa) required for fire extinguishing through an internal nitrogen cylinder, providing a stable power and material basis for powder spraying fire extinguishing. The suspension assembly 2 is located at the top of the powder storage tank 1 and can suspend and fix the entire device on the top of the underground roadway or above equipment (such as air compressor chambers or near cable trays) in the coal mine, ensuring stable installation and not occupying underground working space. The powder spraying structure 3 is located at the bottom of the powder storage tank 1 and serves as a channel for the extinguishing agent to be sprayed out, allowing the powder inside the powder storage tank 1 to be sprayed out. The extinguishing agent is directed to the fire area, covering the fire area to achieve fire extinguishing operations. The triggering structure 4 is located between the powder spraying structure 3 and the powder storage tank 1. It is the switch control component of the powder spraying structure 3 and is electrically connected to the fire detector (external temperature, smoke, etc. sensor) through an explosion-proof cable. When the external sensor reaches the triggering condition, it sends a signal to the triggering structure 4. The triggering structure 4 drives the powder spraying structure 3 to open, so that the extinguishing agent is sprayed out from the powder spraying structure 3 to achieve fire extinguishing. The shielding structure 5 is set up on the triggering structure 4 to isolate the complex electromagnetic interference in the coal mine (such as electromagnetic radiation generated by high-voltage motors and coal mining machines), ensure the stable operation of the triggering structure 4, avoid false triggering or failure to trigger, and ensure the fire extinguishing effect.

[0019] In some embodiments, the trigger structure 4 includes a trigger frame 41, an electromagnetic actuator 42, and a puncture needle (not shown in the figure). The trigger frame 41 is connected to the powder spraying structure 3 and provides a stable mounting support for the electromagnetic actuator 42. It can be fixed by welding. The trigger frame 41 can be a U-shaped frame. The electromagnetic actuator 42 is located on the side of the trigger frame 41 away from the powder spraying structure 3. The telescopic end of the electromagnetic actuator 42 can pass through the trigger frame 41 and be connected to the powder spraying structure 3. The electromagnetic actuator 42 can be electrically connected to a fire detector through an explosion-proof cable. The puncture needle is located on the side of the electromagnetic actuator 41. The end of the telescopic shaft of the device 42 is coaxially aligned with the sealing diaphragm of the container valve 31. When the sensor detects a fire, the electromagnetic actuator 42 is energized to generate electromagnetic force, which drives the telescopic shaft to extend the piercing needle forward, piercing the sealing diaphragm of the container valve 31 and releasing the extinguishing agent. The electromagnetic actuator 42 is a prior art for releasing the extinguishing agent, which will not be described in detail here. The electromagnetic actuator 42 is equipped with a shielding structure 5, which can isolate interference signals and ensure that the electromagnetic actuator 42 only operates under the preset fire trigger signal, avoiding accidental spraying when there is no fire or failure to operate when there is a fire.

[0020] In some embodiments, the shielding structure 5 includes a high-frequency shielding cover 51 and a low-frequency shielding cover 52. The high-frequency shielding cover 51 surrounds the electromagnetic driver 42 and is connected to the underground grounding electrode through a wire. High-frequency electromagnetic interference in the coal mine (such as high-frequency radiation generated by the operation of a high-voltage motor) can be guided to the ground through the high-frequency shielding cover 51, preventing high-frequency interference signals from affecting the coil excitation of the electromagnetic driver 42 and ensuring the stable generation of electromagnetic force. The low-frequency shielding cover 52 is located between the high-frequency shielding cover 51 and the electromagnetic driver 42, and the low-frequency shielding cover 52 is electrically connected to the high-frequency shielding cover 51. Low-frequency electromagnetic interference in the mine (such as the low-frequency magnetic field formed by a metal mine tunnel) can be absorbed by the low-frequency shielding cover 52. The absorbed interference signal is then discharged to the ground through the high-frequency shielding cover 51 via the electrical connection with the high-frequency shielding cover 51. Through the double-layer composite shielding structure of high-frequency shielding and low-frequency shielding, different types of electromagnetic interference in the mine can be fully covered, ensuring the triggering reliability of the electromagnetic driver 42. Both the high-frequency shielding cover 51 and the low-frequency shielding cover 52 are connected to the trigger frame 41 and can be welded and fixed to enhance the installation stability of the high-frequency shielding cover 51 and the low-frequency shielding cover 52.

[0021] In some embodiments, the low-frequency shielding cover 52 may be made of permalloy, which has extremely high magnetic permeability and excellent absorption and shielding effect on low-frequency magnetic fields, and can effectively isolate low-frequency electromagnetic interference downhole; the high-frequency shielding cover 51 may be made of 80-mesh copper mesh, which has good conductivity and significant shielding effect on high-frequency electric fields. In addition, copper mesh is lightweight and easy to process and form, and will not add extra weight to the overall weight of the device, which is suitable for the weight restriction requirements of downhole suspension installation, and at the same time facilitates disassembly and reassembly during subsequent maintenance.

[0022] In some embodiments, the powder spraying structure 3 includes a container valve 31 and a nozzle 32. The container valve 31 is located at the bottom of the powder storage tank 1. Under normal conditions, the container valve 31 is closed to prevent leakage of extinguishing agent or loss of air pressure in the powder storage tank 1. An electromagnetic actuator 42 is provided on one side of the container valve 31, which can be connected by a thread. The nozzle 32 is located at the bottom of the container valve 31. When the container valve 31 is opened, the extinguishing agent in the powder storage tank 1 enters the nozzle 32 through the container valve 31 under air pressure. The nozzle 32 can atomize or guide the extinguishing agent in a direction, so that the extinguishing agent can evenly and accurately cover the fire area, improve the extinguishing efficiency, and the nozzle 32 can be designed as a universal adjustment structure according to the spatial characteristics of the underground installation location to further expand the powder spraying coverage and reduce fire extinguishing dead zones.

[0023] In some embodiments, a pressure gauge 6 is also included. The pressure gauge 6 is connected to the container valve 31. The pressure gauge 6 can be a shock-resistant pressure gauge. The pressure gauge 6 can display the air pressure value in the powder storage tank 1 in real time. When maintenance personnel conduct on-site inspections underground, they can intuitively judge whether the air pressure in the powder storage tank 1 meets the fire extinguishing requirements (such as whether it is lower than the safety threshold of 0.7MPa) by observing the value of the pressure gauge 6, so as to avoid the inability to effectively spray powder when a fire occurs due to insufficient air pressure.

[0024] In some embodiments, a pressure sensor 7 is also included. The pressure sensor 7 may be a diffused silicon pressure sensor, which can be connected to the container valve 31 via a threaded connector. The pressure sensor 7 can convert the air pressure signal in the powder storage tank 1 into an electrical signal, which is transmitted to the ground monitoring terminal through a pre-set communication line underground (such as a mine explosion-proof communication cable) to realize remote real-time monitoring of the air pressure status of the powder storage tank 1. When the air pressure is lower than a preset threshold (such as 0.7 MPa), the ground monitoring terminal can automatically issue an audible and visual alarm signal to remind maintenance personnel to go to the site in time to replenish the air pressure or replace the powder storage tank 1. This eliminates the need for manual inspection of all underground devices, greatly improving maintenance efficiency and reducing labor costs. At the same time, when the fire extinguishing device is activated, the pressure sensor 7 can feed back a signal to the ground monitoring terminal to indicate that the fire extinguishing action has been performed.

[0025] In some embodiments, the suspension assembly 2 includes multiple connecting rods 21 and a suspension ring 22. The multiple connecting rods 21 are evenly arranged in a ring on the top of the powder storage tank 1. The ring-shaped distribution structure can make the top of the powder storage tank 1 uniformly stressed, avoiding the powder storage tank 1 from tilting due to stress imbalance during suspension, and ensuring that the nozzle 32 of the powder spraying structure 3 can always face the preset protection area. The suspension ring 22 is located on the top of the multiple connecting rods 21 and can be welded and fixed. Both the connecting rods 21 and the suspension ring 22 can be made of round steel. The suspension ring 22 can be directly connected to the hook or anchor rod pre-installed in the well to realize the rapid suspension installation of the device.

[0026] The specific working principle is as follows: When a fire occurs underground, the fire detector (such as a temperature sensor or smoke sensor) sends a trigger signal to the electromagnetic actuator 42. The electromagnetic actuator 42 is energized, generating an electromagnetic force to push the telescopic shaft, which in turn drives the puncture needle to puncture the sealing diaphragm of the container valve 31. During this process, the low-frequency shield 52 absorbs low-frequency magnetic field interference in the well, and the high-frequency shield 51 shields high-frequency electric field interference. The interference signal is introduced into the grounding electrode in the well through the wire, ensuring that the electromagnetic driver 42 only responds to the fire trigger signal and does not cause false triggering or failure to trigger.

[0027] After container valve 31 is opened, the extinguishing agent in powder storage tank 1, under pressure, enters nozzle 32 through container valve 31 and is sprayed directionally to the fire area, covering the fire source and surrounding danger zone to extinguish the fire. At the same time, pressure sensor 7 detects that the gas pressure inside the tank drops rapidly within 10 seconds (from 0.8MPa to below 0.3MPa), and sends a "fire extinguishing action execution" signal to the ground terminal. The terminal records the trigger time, location, and gas pressure change for subsequent fire source tracing.

[0028] After the fire is extinguished, disconnect the power supply to the electromagnetic actuator 42. When the electromagnetic force disappears, disassemble the container valve 31, replace the new sealing diaphragm, refill the extinguishing agent, and replenish the pressure to 0.8-1.2MPa through the built-in nitrogen cylinder. After the maintenance is completed, the device returns to standby status.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pneumatic fire extinguishing device for coal mines, comprising a powder storage tank (1); Suspension assembly (2), the suspension assembly (2) is disposed on the top of the powder storage tank (1); The powder spraying structure (3) is located at the bottom of the powder storage tank (1); Its features are: It also includes a trigger structure (4), which is located between the powder spraying structure (3) and the powder storage tank (1); A shielding structure (5) surrounds the triggering structure (4).

2. The pneumatic fire extinguishing device for coal mines according to claim 1, characterized in that: The triggering structure (4) includes a trigger frame (41), which is connected to the powder spraying structure (3); An electromagnetic actuator (42) is located on the side of the trigger frame (41) away from the powder spraying structure (3); and the electromagnetic actuator (42) is provided with the shielding structure (5) outside. The puncture needle is connected to the electromagnetic actuator (42).

3. A pneumatic fire extinguishing device for coal mines according to claim 2, characterized in that: The shielding structure (5) includes a high-frequency shield (51), which surrounds the electromagnetic driver (42) and is grounded; A low-frequency shield (52) is disposed between the high-frequency shield (51) and the electromagnetic driver (42), and the low-frequency shield (52) is electrically connected to the high-frequency shield (51).

4. A pneumatic fire extinguishing device for coal mines according to claim 3, characterized in that: The low-frequency shield (52) is made of permalloy, and the high-frequency shield (51) is made of copper mesh.

5. A pneumatic fire extinguishing device for coal mines according to claim 1, characterized in that: The powder spraying structure (3) includes a container valve (31), which is located at the bottom of the powder storage tank (1), and the triggering structure (4) is provided on one side of the container valve (31). Nozzle (32), the nozzle (32) is located at the bottom of the container valve (31).

6. A pneumatic fire extinguishing device for coal mines according to claim 5, characterized in that: It also includes a pressure gauge (6) connected to the container valve (31).

7. A pneumatic fire extinguishing device for coal mines according to claim 5, characterized in that: It also includes a pressure sensor (7) which is connected to the container valve (31).

8. A pneumatic fire extinguishing device for coal mines according to claim 1, characterized in that: The suspension assembly (2) includes multiple connecting rods (21), which are arranged in a ring on the top of the powder storage tank (1); A suspension ring (22) is located on top of the multiple connecting rods (21).

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