Automatic nitrogen injection device for underground fire prevention and extinguishing

Abstract

The utility model discloses an automatic nitrogen injection device for underground fire prevention and extinguishing, and relates to the technical field of mine safety equipment. The storage tank comprises a protective shell, a storage tank device is fixedly connected to an inner cavity of the protective shell, a cooling mechanism is arranged on one side of the protective shell, the storage tank device comprises a shelf, a first storage tank is fixedly connected to the top of the shelf, and a second storage tank is fixedly connected to the bottom of the shelf. The surface of the first storage tank communicates with a communicating pipe, and the side, away from the first storage tank, of the communicating pipe communicates with the second storage tank. The first storage tank and the second storage tank are communicated through the communicating pipe to form a flexible nitrogen storage combined structure, nitrogen can be flexibly allocated according to fire preventing and extinguishing requirements of different underground areas and different stages, and compared with the design of a single storage tank, the nitrogen storage and use efficiency and flexibility are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of mine safety equipment, and in particular relates to an automatic nitrogen injection device for underground fire prevention and extinguishing. Background Technology

[0002] In underground mining operations, fire hazards remain a significant threat to safe production. Nitrogen injection fire prevention and extinguishing technology, which involves injecting nitrogen into the mine to reduce oxygen concentration and thus inhibit the occurrence and spread of fires, has become a commonly used fire prevention and extinguishing method.

[0003] Current nitrogen storage tanks are mostly single structures, lacking effective combination designs, making it difficult to meet the complex and ever-changing nitrogen injection needs downhole. Moreover, the storage tanks are independent of each other, making it impossible to achieve flexible allocation and efficient utilization of nitrogen. At the same time, the downhole environment temperature varies greatly, and the nitrogen in the injection pipeline may expand in volume due to heat, leading to increased pressure and potentially causing danger.

[0004] To address these issues, we have provided an automatic nitrogen injection device for downhole fire prevention and extinguishing. Utility Model Content

[0005] The purpose of this utility model is to provide an automatic nitrogen injection device for fire prevention and extinguishing in wells. By combining the storage tank equipment and the cooling mechanism, it solves the problem that the nitrogen storage tanks in the existing technology are mostly of a single structure, which is difficult to meet the complex and ever-changing nitrogen injection needs in wells. The nitrogen in the nitrogen injection pipeline may expand in volume due to heat, causing safety hazards.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to an automatic nitrogen injection device for underground fire prevention and extinguishing, comprising a protective shell. A storage tank is fixedly connected to the inner cavity of the protective shell. A cooling mechanism is provided on one side of the protective shell. The storage tank includes a shelf. A first storage tank is fixedly connected to the top of the shelf, and a second storage tank is fixedly connected to the bottom of the shelf. A connecting pipe is connected to the surface of the first storage tank. The side of the connecting pipe away from the first storage tank is connected to the second storage tank. A first conveying pipe is connected to the other side of the second storage tank. A feed pipe is connected to one side of the top of the first storage tank. The top of the feed pipe penetrates the inner cavity of the protective shell and extends to the outside of the protective shell. A feed pipe is connected to one side of the feed pipe. The second delivery pipe has a pressure gauge connected to its surface. The protective shell has a double-layer structure: the inner layer is a steel plate, which can withstand possible mechanical collisions and impacts downhole, and the outer layer is an anti-corrosion coating, which can effectively prevent the corrosion of corrosive gases downhole. The inner steel plate provides good impact resistance and can effectively protect the internal storage tank equipment from damage caused by mechanical collisions downhole. The outer anti-corrosion coating improves the fire resistance and corrosion resistance of the protective shell and extends the service life of the equipment. The two ends of the connecting pipe are respectively connected to the middle of the first and second storage tanks, and the connection between the connecting pipe and the tank body adopts a flange sealing connection method, which not only ensures the connection strength but also facilitates later inspection and maintenance.

[0008] This utility model is further configured such that the cooling mechanism includes a pump body, one side of which is connected to a first delivery pipe, and another side of which is connected to a third delivery pipe. A cooling pipe is sleeved on the surface of the third delivery pipe, and a return pipe is connected to one side of the bottom of the cooling pipe. A cooling box is connected to one side of the return pipe, and a circulation pump is connected to one side of the cooling box. A cooling pipe is connected to one side of the circulation pump, and a cooling pipe is connected to one side of the cooling pipe. By circulating the coolant, the heat of the nitrogen is removed, avoiding the problem of increased pipeline pressure caused by nitrogen expansion due to high underground temperatures. This significantly reduces the risk of pipe bursts, ensures the safe operation of the nitrogen injection system, and the stable low-temperature environment can slow down the aging rate of pipelines and valves, reduce damage to seals caused by thermal expansion and contraction, extend the service life of equipment, and the cooled nitrogen has a higher density, resulting in better settling effect in the tunnel and more effectively covering the fire source area, thus improving the suffocation fire extinguishing effect.

[0009] The present invention is further configured such that a support base is fixedly connected to the bottom of the pump body, and a base plate is fixedly connected to the bottom of the support base. The combined structure of the support base and the base plate can disperse vibration energy and reduce the risk of damage to the pump body caused by vibration.

[0010] The present invention is further configured such that side plates are fixedly connected to both sides of the protective shell, and reinforcing strips are fixedly connected to the front and rear ends of the protective shell. The rigid frame formed by the side plates and reinforcing strips can effectively disperse the impact force, protect the internal storage tank and pipelines, enhance the torsional resistance of the protective shell, and ensure that the equipment does not deform under complex geological conditions.

[0011] The present invention is further configured such that explosion-proof plates are fixedly connected to both sides of the top and both sides of the bottom of the shelf, and one side of the explosion-proof plate is fixedly connected to the protective shell. When the pressure inside the tank rises abnormally and causes an explosion, the explosion-proof plate can absorb part of the explosion energy and reduce the damage of the shock wave to the protective shell and surrounding equipment.

[0012] The present invention is further configured such that a pressure relief pipe is connected to the other side of the first storage tank, and a pressure relief valve is connected to the surface of the pressure relief pipe. When the pressure inside the tank exceeds a set threshold, the pressure relief valve automatically opens to release excess nitrogen and prevent the tank from rupturing due to overpressure. This forms a dual pressure monitoring mechanism in conjunction with the pressure gauge. Even if the pressure gauge fails, the pressure relief valve can still be triggered mechanically to ensure system safety.

[0013] The present invention is further configured such that a control valve is fixedly connected to the surface of the connecting pipe. The control valve is a solenoid valve, which can adjust the connection status between the two storage tanks in real time according to the underground fire situation and nitrogen demand, thereby improving the response speed.

[0014] The present invention has the following beneficial effects.

[0015] 1. This utility model uses a first storage tank and a second storage tank, and connects the two through a connecting pipe to form a flexible nitrogen storage combination structure. It can flexibly allocate nitrogen according to the fire prevention and extinguishing needs of different areas and stages underground. Compared with a single storage tank design, it significantly improves the efficiency and flexibility of nitrogen storage and use.

[0016] 2. This utility model pumps nitrogen gas from the first delivery pipe to the third delivery pipe via a pump body. A cooling pipe fitted on the surface of the third delivery pipe, together with a cooling box, a circulating pump, and cooling pipes, forms a circulating cooling system. When nitrogen gas passes through the third delivery pipe, the circulating coolant can quickly remove the heat from the nitrogen gas and lower its temperature, thereby preventing the pipeline pressure from rising due to nitrogen expansion caused by high temperature. This ensures the safe and stable operation of nitrogen injection and effectively avoids dangerous situations such as pipeline leakage and rupture caused by excessive pressure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1A 3D view of an automatic nitrogen injection system for fire prevention and extinguishing in underground wells.

[0019] Figure 2 A side-view perspective of an automatic nitrogen injection system for fire prevention and extinguishing in underground mines.

[0020] Figure 3 A three-dimensional diagram of the cooling mechanism in an automatic nitrogen injection system for fire prevention and extinguishing in underground mines.

[0021] Figure 4 A perspective view of the first storage tank and its connecting structure in an automatic nitrogen injection system for underground fire prevention and extinguishing.

[0022] Figure 5 A side-view perspective of the protective casing in an automatic nitrogen injection system for fire prevention and extinguishing in wells.

[0023] In the attached diagram: 1. Protective shell; 2. Storage tank equipment; 21. Shelf; 22. First storage tank; 23. Second storage tank; 24. Connecting pipe; 25. First conveying pipe; 26. Feed pipe; 27. Second conveying pipe; 28. Pressure gauge; 3. Cooling mechanism; 31. Pump body; 32. Third conveying pipe; 33. Cooling pipe; 34. Return pipe; 35. Cooling box; 36. Circulating pump; 37. Cooling pipe; 4. Support base; 5. Base plate; 6. Side plate; 7. Reinforcing strip; 8. Explosion-proof plate; 9. Pressure relief pipe; 10. Pressure relief valve; 11. Control valve. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figure 1-5 This utility model is an automatic nitrogen injection device for underground fire prevention and extinguishing, including a protective shell 1. A storage tank device 2 is fixedly connected to the inner cavity of the protective shell 1. A cooling mechanism 3 is provided on one side of the protective shell 1. The storage tank device 2 includes a shelf 21. A first storage tank 22 is fixedly connected to the top of the shelf 21, and a second storage tank 23 is fixedly connected to the bottom of the shelf 21. A connecting pipe 24 is connected to the surface of the first storage tank 22. The side of the connecting pipe 24 away from the first storage tank 22 is connected to the second storage tank 23. A first conveying pipe 25 is connected to the other side of the second storage tank 23. A feed pipe 26 is connected to one side of the top of the first storage tank 22. The top of the feed pipe 26 penetrates the inner cavity of the protective shell 1 and extends to the outside of the protective shell 1. A second conveying pipe 27 is connected to one side of the feed pipe 26. A pressure gauge 28 is connected to the surface of the second conveying pipe 27.

[0027] Specifically: The protective shell 1 adopts a double-layer structure. The inner layer is a steel plate, which can resist mechanical collisions and impacts that may occur underground. The outer layer is an anti-corrosion coating, which can effectively prevent the corrosion of corrosive gases underground. The inner steel plate provides good impact resistance and can effectively protect the internal storage tank equipment 2 from damage caused by mechanical collisions underground. The outer anti-corrosion coating improves the fire resistance and corrosion resistance of the protective shell 1 and extends the service life of the equipment. The two ends of the connecting pipe 24 are respectively connected to the middle of the first storage tank 22 and the second storage tank 23. The connection between the connecting pipe 24 and the tank body adopts a flange sealing connection method, which not only ensures the connection strength, but also facilitates later inspection and maintenance.

[0028] Example 2

[0029] Please see Figure 1-5 Based on Embodiment 1, the cooling mechanism 3 includes a pump body 31. One side of the pump body 31 is connected to a first delivery pipe 25, and another side of the pump body 31 is connected to a third delivery pipe 32. A cooling pipe 33 is sleeved on the surface of the third delivery pipe 32. One side of the bottom of the cooling pipe 33 is connected to a return pipe 34, and one side of the return pipe 34 is connected to a cooling box 35. One side of the cooling box 35 is connected to a circulating pump 36, and one side of the circulating pump 36 is connected to a cooling pipe 37. One side of the cooling pipe 37 is connected to the cooling pipe 33. The bottom of the pump body 31... The first storage tank 22 is fixedly connected to a support base 4, and a base plate 5 is fixedly connected to the bottom of the support base 4. Side plates 6 are fixedly connected to both sides of the protective shell 1. Reinforcing strips 7 are fixedly connected to the front and rear ends of the protective shell 1. Explosion-proof plates 8 are fixedly connected to both sides of the top and bottom of the shelf 21. One side of the explosion-proof plate 8 is fixedly connected to the protective shell 1. The other side of the first storage tank 22 is connected to a pressure relief pipe 9. A pressure relief valve 10 is connected to the surface of the pressure relief pipe 9. A control valve 11, which is a solenoid valve, is fixedly connected to the surface of the connecting pipe 24.

[0030] Specifically: The circulating coolant removes heat from the nitrogen, preventing pressure increases in pipelines caused by nitrogen expansion due to high underground temperatures, significantly reducing the risk of pipe bursts and ensuring the safe operation of the nitrogen injection system. The stable low-temperature environment slows down the aging of pipelines and valves, reducing seal damage caused by thermal expansion and contraction, extending equipment lifespan. Cooled nitrogen has a higher density, resulting in better settling in the tunnel and more effectively covering the fire source area, improving the suffocation extinguishing effect. The combined structure of the support base 4 and the base plate 5 disperses vibration energy, reducing the risk of damage to the pump body 31 due to vibration. The rigid frame formed by the side plates 6 and reinforcing strips 7 effectively disperses impact forces, ensuring... The protective shell 1 enhances the torsional resistance of the internal storage tanks and pipelines, ensuring that the equipment does not deform under complex geological conditions. When an abnormal increase in internal pressure causes an explosion, the explosion-proof plate 8 can absorb part of the explosion energy, reducing the damage of the shock wave to the protective shell 1 and surrounding equipment. When the pressure exceeds the set threshold, the pressure relief valve 10 automatically opens to release excess nitrogen, preventing the tank from rupturing due to overpressure. It works in conjunction with the pressure gauge 28 to form a dual pressure monitoring mechanism. Even if the pressure gauge 28 fails, the pressure relief valve 10 can still be triggered mechanically to ensure system safety. The control valve 11 can adjust the connection status between the two storage tanks in real time according to the underground fire situation and nitrogen demand, improving the response speed.

[0031] The working principle of this utility model is as follows: The storage tank equipment 2 consists of a first storage tank 22 and a second storage tank 23, which are connected by a connecting pipe 24. The control valve 11 on the connecting pipe 24 controls the flow of nitrogen. When the pressure of the first storage tank 22 is high, the control valve 11 opens and the nitrogen flows to the second storage tank 23 to achieve pressure balance. When a large amount of nitrogen needs to be injected, the two tanks can be supplied with gas at the same time. The feed pipe 26 is used to supplement nitrogen. The pressure gauge 28 monitors the pressure inside the tank in real time. If the pressure exceeds the safe range, the pressure relief valve 10 automatically opens to release excess nitrogen. The double-layer structure of the protective shell 1 resists the impact and corrosion of the well. The explosion-proof plate 8 blocks the explosion energy in the event of an accident, protecting the safe operation of the storage tank equipment 2.

[0032] Pump 31 pressurizes the nitrogen gas in the first delivery pipe 25 and sends it into the third delivery pipe 32. In the cooling pipe 33 outside the third delivery pipe 32, the coolant circulates under the drive of the circulating pump 36. The coolant exchanges heat with the high temperature nitrogen gas in the third delivery pipe 32, absorbs heat and flows back to the cooling box 35 to cool down, and then flows back into the cooling pipe 33. Through the continuous circulation of the coolant, the temperature of the nitrogen gas is effectively reduced, avoiding the increase in pipeline pressure caused by the expansion of nitrogen gas due to high temperature. The density of the cooled nitrogen gas increases, and the settling effect in the tunnel is better, which is more conducive to covering the fire source area. At the same time, the low temperature environment also slows down the aging speed of pipeline components and ensures the stable operation of the nitrogen injection system.

[0033] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. An automatic nitrogen injection device for fire prevention and extinguishing in wells, comprising a protective shell (1), characterized in that: The inner cavity of the protective shell (1) is fixedly connected to a storage tank device (2), and a cooling mechanism (3) is provided on one side of the protective shell (1); The storage tank equipment (2) includes a shelf (21), a first storage tank (22) is fixedly connected to the top of the shelf (21), a second storage tank (23) is fixedly connected to the bottom of the shelf (21), a connecting pipe (24) is connected to the surface of the first storage tank (22), the side of the connecting pipe (24) away from the first storage tank (22) is connected to the second storage tank (23), the other side of the second storage tank (23) is connected to a first conveying pipe (25), a feed pipe (26) is connected to one side of the top of the first storage tank (22), the top of the feed pipe (26) penetrates the inner cavity of the protective shell (1) and extends to the outside of the protective shell (1), a second conveying pipe (27) is connected to one side of the feed pipe (26), and a pressure gauge (28) is connected to the surface of the second conveying pipe (27).

2. The automatic nitrogen injection device for downhole fire prevention and extinguishing according to claim 1, characterized in that: The cooling mechanism (3) includes a pump body (31), one side of which is connected to a first delivery pipe (25), and one side of which is connected to a third delivery pipe (32). A cooling pipe (33) is sleeved on the surface of the third delivery pipe (32). One side of the bottom of the cooling pipe (33) is connected to a return pipe (34). One side of the return pipe (34) is connected to a cooling box (35). One side of the cooling box (35) is connected to a circulating pump (36). One side of the circulating pump (36) is connected to a cooling pipe (37). One side of the cooling pipe (37) is connected to the cooling pipe (33).

3. The automatic nitrogen injection device for downhole fire prevention and extinguishing according to claim 2, characterized in that: The bottom of the pump body (31) is fixedly connected to a support base (4), and the bottom of the support base (4) is fixedly connected to a base plate (5).

4. The automatic nitrogen injection device for downhole fire prevention and extinguishing according to claim 1, characterized in that: Side plates (6) are fixedly connected to both sides of the protective shell (1), and reinforcing strips (7) are fixedly connected to both the front and rear ends of the protective shell (1).

5. The automatic nitrogen injection device for downhole fire prevention and extinguishing according to claim 1, characterized in that: Explosion-proof plates (8) are fixedly connected to both sides of the top and both sides of the bottom of the shelf (21), and one side of the explosion-proof plate (8) is fixedly connected to the protective shell (1).

6. The automatic nitrogen injection device for downhole fire prevention and extinguishing according to claim 1, characterized in that: The other side of the first storage tank (22) is connected to a pressure relief pipe (9), and the surface of the pressure relief pipe (9) is connected to a pressure relief valve (10).

7. The automatic nitrogen injection device for downhole fire prevention and extinguishing according to claim 1, characterized in that: A control valve (11) is fixedly connected to the surface of the connecting pipe (24), and the control valve (11) is a solenoid valve.

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