Remote switching nitrogen injection pipeline

Abstract

A remote switching nitrogen injection pipeline comprises a plurality of main air pipes 10 and a plurality of valve body pipes 20, the main air pipes 10 and the valve body pipes 20 are connected in an end-to-end mode, first outlets 11 of the main air pipes are connected with first air inlets 21 of the valve body pipes, second outlets 12 of the main air pipes are connected with second air inlets 22 of the valve body pipes, a main air inlet 13 is connected with valve body pipe outlets 23, and the valve body pipes 20 are connected with valve body pipe outlets 23. The valve body pipe is provided with a switching valve element 30, and the switching valve element 30 is switched between a ventilation position and an exhaust position. The nitrogen injection device has the beneficial effects that a plurality of main air pipes and a plurality of valve body pipes are connected end to end, and the switching pull rope is used for operating the switching valve core, so that the switching of the gas transmission outlets of the nitrogen injection pipe is realized; and due to the connecting structure of the valve body pipe and the main air pipe, the switching valve element axially slides to achieve switching of the exhaust port, remote switching operation can be conveniently achieved through the pull rope, reliability is high, and prominent practicability is achieved.

Description

Technical Field

[0001] The utility model relates to a nitrogen injection switching device for preventing and extinguishing fire in an underground coal mine, in particular to a remote switching nitrogen injection pipeline. Background Art

[0002] Currently, buried nitrogen injection technology in coal mines often uses a dual-pipe system to prevent spontaneous combustion of floating coal in the goaf during mining face recovery. During the recovery process, two dedicated nitrogen injection lines are pre-buried along the goaf on the air inlet side. After a certain length of burial, nitrogen injection begins from the first line. When the outlet of the first nitrogen injection line reaches the junction of the oxidation zone and the asphyxiation zone in the goaf, injection from the first line is stopped and the second line begins, repeating this cycle until mining is complete. This nitrogen injection technology requires repeated disconnection of the pre-buried nitrogen injection lines. Depending on the actual underground site conditions, pre-buried two rows of nitrogen injection lines in the working face incurs significant piping and labor costs. Pipeline replacement work must be performed in parallel with coal face maintenance. Long-term rusting of the pipe screws can also cause operational difficulties. Furthermore, the confined air inlet corner increases safety risks. A Chinese utility model patent (application number 2022209833580) discloses a switchable nitrogen injection pipeline that uses an elastic butterfly valve and a sealing plug to control the main line and branch line. Its switching device uses a rope to simultaneously pull the elastic butterfly valve located in the main line and the sealing plug of the branch line. Its disadvantage is that the sealing effect and operation effect of the sealing plug are difficult to control, the operation process is relatively complicated, and the reliability is low. Utility Model Content

[0003] The purpose of the utility model is to provide a remote switching nitrogen injection pipeline to achieve safe and reliable operation of remote switching of the nitrogen injection pipeline.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a remote switching nitrogen injection pipeline, comprising a plurality of main air pipes (10) and a plurality of valve body pipes (20), wherein the main air pipes are provided with a main air inlet (13), a first outlet (11) and a second outlet (12), and the valve body pipes (20) are provided with a first air inlet (21), a second air inlet (22), a valve body pipe outlet (23) and a valve body pipe exhaust port (24), the plurality of main air pipes (10) and the plurality of valve body pipes (20) are connected end to end, and the first outlet (11) of the main air pipe is connected to the first inlet (21) of the valve body pipe. The air port (21) is connected to the second air port (22) of the valve body pipe, and the main air port (13) is connected to the valve body pipe outlet (23). The valve body pipe is provided with a switching valve core (30). The switching valve core (30) switches between a ventilation position and an exhaust position. In the ventilation position, the first air port (21) is connected to the valve body pipe outlet (23). In the exhaust position, the second air port (22) is connected to the valve body pipe exhaust port (24). The switching valve is provided with a switching pull rope (31).

[0005] Furthermore, a preferred valve body tube structure is that the valve body tube (20) is provided with a valve core tube (25), the switching valve core (30) is sealingly and slidingly matched with the valve core tube (25), the first air inlet (21) and the valve body tube exhaust port (24) are respectively arranged at two ends of the valve core tube, the valve core tube (25) is connected to an outlet pipe (26) and an exhaust pipe (27), the outlet pipe (26) is provided with the valve body tube outlet (23), and the exhaust pipe (27) is provided with the second air inlet (22).

[0006] Furthermore, in the ventilation position, the switching valve core (30) blocks the exhaust pipe (27), so that the first air inlet (21) is connected to the valve body pipe outlet (23); in the exhaust position, the switching valve core (30) blocks the first air inlet (21), so that the second air inlet (22) is connected to the valve body pipe exhaust port (24).

[0007] Furthermore, the main air duct (10) is provided with a curved section (14), the main air inlet (13) is arranged at one end of the main air duct (10), the first outlet (11) is arranged at the other end of the main air duct (10), the axis of the main air inlet (13) is parallel to the axis of the first outlet (11), the second outlet (12) is close to the first outlet (11), and the axis of the second outlet (12) is perpendicular to the axis of the first outlet (11); the outlet pipe (26) is an elbow pipe, the outlet pipe (26) is connected to the valve core pipe (25) at one end close to the first air inlet (21), and the axis of the valve body pipe outlet (23) is parallel to the valve core pipe (25); the exhaust pipe (27) is a U-shaped pipe, the exhaust pipe (27) is connected to the valve core pipe (25) at one end close to the valve body pipe exhaust port (24), and the axis of the second air inlet (22) is perpendicular to the valve core pipe (25).

[0008] Furthermore, the outlet pipe (26) is provided with a pull rope outlet (28), and the switching pull rope (31) passes through the main air duct (10) and exits from the pull rope outlet (28).

[0009] Furthermore, the valve body tube (20) is provided with a switching pin (40) and a switching pin guide sleeve (41), the switching pin guide sleeve (41) is arranged perpendicular to the ground, the switching pin (40) is installed in the switching pin guide sleeve (41), and in the exhaust position, the switching pin falls and prevents the switching valve core (30) from leaving the exhaust position, and a guide sleeve nut (42) is provided on the switching pin guide sleeve (41).

[0010] Furthermore, the valve body tube (20) is provided with a switching pin (40) and a switching pin guide sleeve (41), the switching pin (40) is installed in the switching pin guide sleeve (41), the switching pin guide sleeve (41) is provided with a guide sleeve nut (42), and a top pressure spring (43) is provided between the guide sleeve nut (42) and the switching pin (40), and in the exhaust position, the top pressure spring pushes the switching pin (40) into the valve body tube (20) and prevents the switching valve core (30) from leaving the exhaust position.

[0011] Furthermore, the switching valve core (30) is provided with a valve core pull ring (32), and the valve core pull ring (32) faces the valve body pipe exhaust port (24).

[0012] Furthermore, the switching rope (31) is a steel rope or a steel wire or a nylon rope.

[0013] Furthermore, the remote switching nitrogen injection pipeline is arranged in a transport chute under the coal mine, the valve body pipe outlet (23) of the frontmost valve body pipe (20) is connected to an end pipe, and the interval distance between the valve body pipes (20) is 40m.

[0014] The beneficial effects of the utility model are as follows: multiple main air ducts and multiple valve body tubes are connected end to end, and the switching valve core is operated by switching the pull rope to realize the switching of the gas outlet of the nitrogen injection tube; the connection structure of the valve body tube and the main air duct enables the switching valve core to slide axially to realize the switching of the exhaust port, so that the pull rope can conveniently realize the remote switching operation, with high reliability and outstanding practicality.

[0015] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the utility model device;

[0017] Figure 2 This is a structural diagram of the connection between the main air duct and the valve body tube of the utility model;

[0018] Figure 3 This is an exploded view of the structure of the utility model;

[0019] Figure 4 This is an enlarged view of the valve body tube and the switching valve core structure of the utility model, with the switching valve core in the ventilation position;

[0020] Figure 5 This is an enlarged view of the valve body tube and the switching valve core structure of the utility model, with the switching valve core in the exhaust position;

[0021] Figure 6 This is a structural diagram of the utility model using a top pressure spring to push the switching pin;

[0022] Figure 7 It is a schematic diagram of the airflow of the utility model in the ventilation position;

[0023] Figure 8 It is a schematic diagram of the airflow of the utility model at the exhaust position;

[0024] Figure 9 It is a schematic diagram of the utility model being applied underground. DETAILED DESCRIPTION

[0025] Example 1:

[0026] like Figures 1 to 9 A remote switching nitrogen injection pipeline includes multiple main air pipes 10 and multiple valve body pipes 20.

[0027] The main air duct 10 is a pipe with a curved section 14. It is equipped with a main air inlet 13, a first outlet 11, and a second outlet 12. The main air inlet 13 is located at one end of the main air duct 10, and the first outlet 11 is located at the other end of the main air duct 10. The axis of the main air inlet 13 is parallel to the axis of the first outlet 11. The second outlet 12 is adjacent to the first outlet 11 and its axis is perpendicular to the axis of the first outlet 11. The first outlet 11 and the second outlet 12 form a three-way structure.

[0028] The valve body tube 20 is provided with a first air inlet 21, a second air inlet 22, a valve body tube outlet 23, and a valve body tube exhaust 24. The main body of the valve body tube 20 is a valve core tube 25. The first air inlet 21 and the valve body tube exhaust 24 are respectively provided at the two ends of the valve core tube 25. The valve core tube 25 is connected to an outlet pipe 26 and an exhaust pipe 27.

[0029] The outlet pipe 26 is an elbow pipe, which is connected to the valve core pipe 25 at one end close to the first air inlet 21. The valve body pipe outlet 23 is set at the end of the outlet pipe 26. The axis of the valve body pipe outlet 23 is parallel to the valve core pipe 25. A pull rope outlet 28 is provided on the outlet pipe 26.

[0030] The exhaust pipe 27 is a U-shaped pipe. The exhaust pipe 27 is connected to the valve core pipe 25 at one end close to the valve body pipe exhaust port 24. The second air inlet 22 is set at the end of the exhaust pipe 27. The axis of the second air inlet 22 is perpendicular to the valve core pipe 25.

[0031] A switching valve core 30 is provided in the valve core tube 25. Similar to a piston, the switching valve core 30 is in sealing and sliding cooperation with the valve core tube 25. In order to prevent air leakage, the switching valve core 30 is provided with a sealing ring 33. The switching valve core 30 switches between the ventilation position and the exhaust position. In the ventilation position, Figure 7 As shown, the switching valve core 30 is located at the position of the valve core tube 25 close to the valve body tube outlet 23, blocking the exhaust pipe 27, so that the valve body tube exhaust port 24 is closed; at the same time, the first air inlet 21 is connected to the valve body tube outlet 23, and the air flow can enter from the first air inlet 21, pass through the outlet pipe 26, and be output from the valve body tube outlet 23.

[0032] In the exhaust position, such as Figure 8 As shown, the switching valve core 30 is located at one end of the first air inlet 21 of the valve core tube 25, blocking the outlet pipe 26, closing the valve body tube outlet 23; at the same time, the second air inlet 22 is connected to the valve body tube exhaust port 24, allowing air to enter from the second air inlet 22, pass through the exhaust pipe 27, and exit from the valve body tube exhaust port 24. This achieves pipeline switching.

[0033] When the switching valve core is in the ventilation position, the valve body pipe 20 realizes the conduction function of connecting the two main air ducts. When the switching valve core is in the exhaust position, the valve body pipe 20 exhausts and cuts off the communication between the two main air ducts.

[0034] like Figure 1 、 Figure 2 As shown, there are multiple main air ducts 10 and multiple valve body tubes 20 connected end to end. At the front end of the main air duct 10, the first outlet 11 of the main air duct is connected to the first air inlet 21 of a valve body tube (2A), and the second outlet 12 of the main air duct is connected to the second air inlet 22 of this valve body tube (2A); the main air inlet 13 is connected to the valve body tube outlet 23 of another valve body tube (2B), thus forming a connection structure in which multiple main air ducts and multiple valve body tubes are connected end to end. At the front end of a valve body tube (such as Figure 1 The valve body tube 2A shown in the figure has its outlet 23 connected to a terminal tube 50. In this embodiment, the main air duct 10 and the valve body tube 20 are flange-connected, and the valve body tube 20 and the terminal tube 50 are also flange-connected. To prevent the switching valve core 30 from falling out of the valve core tube 25, the diameter of the valve core tube 25 is larger than that of the main air duct.

[0035] The switching valve core 30 is equipped with a switching cord 31. The switching cord 31 passes through the main air duct 10 at the first outlet 11, then through the main air duct 10, out through the main air inlet 13, into the outlet pipe 26 of the next valve body pipe, and out through the cord outlet 28. The cord outlet 28 is equipped with a sealing ring 28a and a sealing cap 28b to prevent air leakage. At the frontmost valve body pipe, since the valve body pipe outlet 23 is connected to a terminal pipe 50, the switching cord does not need to pass through the cord outlet 28. Instead, the cord outlet 28 is sealed with a solid plug 29.

[0036] The switch rope 31 can be a steel rope, a steel wire or a nylon rope.

[0037] The valve body tube 20 is provided with a switching pin 40 and a switching pin guide sleeve 41. The switching pin 40 is a cylindrical pin with a stepped shaft structure. The switching pin guide sleeve 41 is arranged on the valve core tube 25. The valve core tube is provided with a pin hole through which the switching pin can pass. The switching pin guide sleeve 41 is arranged at the position of the pin hole and is arranged perpendicular to the ground. The switching pin 40 is installed in the switching pin guide sleeve 41 and can slide in the switching pin guide sleeve. When the switching valve core 30 is in the ventilation position, the switching pin 40 falls on the switching valve core 30. When the switching valve core 30 is in the exhaust position, it will move out of the position of the switching pin 40. Under the action of gravity, the switching pin 40 falls freely, which can prevent the switching valve core 30 from moving to the ventilation position and prevent the switching valve core 30 from leaving the exhaust position. The stepped shaft structure of the switching pin 40 can prevent it from falling into the valve core tube 25.

[0038] A guide nut 42 is attached to the switch pin guide sleeve 41. The guide nut 42 prevents the switch pin 40 from falling out of the switch pin guide sleeve 41 and also keeps the interior of the switch pin guide sleeve clean. In the vent position, the switch pin 40 in this embodiment protrudes above the upper end of the switch pin guide sleeve 41. Tightening the guide nut 42 locks the switch valve core 30 in the vent position, preventing it from accidentally sliding. When switching is required, loosening the guide nut 42 allows the switch valve core 30 to be moved.

[0039] The switching valve core 30 is equipped with a valve core pull ring 32, which faces the valve body pipe exhaust port 24. During pipeline installation, the switching valve core 30 can be pulled using the valve core pull ring 32 to adjust the switching valve core's position. If the switching valve core is accidentally moved, the valve core pull ring 32 can be pulled to reset the switching valve core 30.

[0040] During the gas transmission process, the injected nitrogen gas flow is transported forward along the main air duct 10 and through the valve body tube 20. When the valve body tube 20 needs to transport the gas flow to the next main air duct, the valve core 30 is switched to the ventilation position, and the gas flow enters the main air duct in front through the valve body tube. Figure 7 When the valve body tube 20 is in the outlet position, the airflow is blocked by the valve body tube from entering the main air duct in front, and the airflow is output from the valve body tube exhaust port 24. Figure 8 shown.

[0041] like Figure 9 As shown, the remote switching nitrogen injection pipeline is set in the transportation chute under the coal mine.

[0042] Before starting mining at the coal mining face, a nitrogen injection pipeline is laid on the air inlet side to the air inlet corner.

[0043] According to actual conditions and requirements, a valve body tube 20 is arranged at intervals. In this embodiment, the interval between the valve body tubes 20 is 40 m.

[0044] As the coal mining face moves, when the boundary between the heat dissipation zone and the oxidation zone in the goaf reaches a valve body pipe 20, the valve body pipe 20 starts to inject nitrogen into the goaf. Figure 9 (A).

[0045] Afterwards, as the coal mining face continues to move, when the boundary between the heat dissipation zone and the oxidation zone in the goaf reaches the next valve body pipe 20, the valve body pipe 20 begins to inject nitrogen into the goaf. Figure 9 (B).

[0046] The remote switching nitrogen injection pipeline of the utility model adopts a piston structure, has good sealing performance and stable movement, and realizes reliable switching of the nitrogen injection pipeline.

[0047] In the utility model, a pull rope axially pulls the switching valve core, and the pull rope comes out from the outlet pipe. The pulling is smooth, and the remote switching of the nitrogen injection pipe can be effectively realized.

[0048] The utility model adopts a switching pin, which can keep the switching valve core stably in the ventilation position and the exhaust position.

[0049] The utility model adopts a valve core pull ring, which facilitates the installation, debugging and maintenance of the switching valve core.

[0050] The utility model adopts the most commonly used steel pipe and flange pipe structure, has low application cost, and is suitable for underground nitrogen injection pipelines that do not require material recovery.

[0051] Example 2:

[0052] like Figure 6 , a remote switch nitrogen injection pipeline. This embodiment is a structural improvement of the first embodiment.

[0053] In this embodiment, a switch pin guide sleeve 41 is disposed on the valve core tube 25, and the switch pin 40 is mounted within the switch pin guide sleeve 41. A guide sleeve nut 42 is mounted on the switch pin guide sleeve 41, and a pressure spring 43 is disposed between the guide sleeve nut 42 and the switch pin 40. When the switch valve core 30 is in the exhaust position, the pressure spring pushes the switch pin 40 into the valve core tube 25, preventing the switch valve core 30 from leaving the exhaust position.

[0054] This embodiment changes the design of the switching pin 40 falling by gravity, and adopts a top pressure spring to push the switching pin to move, ensuring that the switching pin has sufficient movement ability, avoiding the switching pin from moving smoothly due to long-term disuse, and ensuring effective switching of the nitrogen injection pipeline.

[0055] In addition, compared with the first embodiment, the switching pin 40 of this embodiment does not need to be arranged perpendicular to the bottom surface, and can be arranged in any direction.

Claims

1. A remote switching nitrogen injection pipeline, characterized in that: The invention comprises a plurality of main air ducts (10) and a plurality of valve body tubes (20), wherein the main air ducts are provided with a main air inlet (13), a first outlet (11) and a second outlet (12), and the valve body tubes (20) are provided with a first air inlet (21), a second air inlet (22), a valve body tube outlet (23) and a valve body tube exhaust (24). The plurality of main air ducts (10) and the plurality of valve body tubes (20) are connected end to end, wherein the first outlet (11) of the main air duct is connected to the first air inlet (21) of the valve body tube, and the second outlet (12) of the main air duct is connected to the first air inlet (21) of the valve body tube. The port (12) is connected to the second air inlet (22) of the valve body tube, the main air inlet (13) is connected to the valve body tube outlet (23), the valve body tube is provided with a switching valve core (30), the switching valve core (30) switches between a ventilation position and an exhaust position, in the ventilation position, the first air inlet (21) is communicated with the valve body tube outlet (23), in the exhaust position, the second air inlet (22) is communicated with the valve body tube exhaust port (24), and the switching valve is provided with a switching pull rope (31).

2. The remote switching nitrogen injection pipeline according to claim 1 is characterized in that: The valve body tube (20) is provided with a valve core tube (25), the switching valve core (30) is sealingly and slidingly matched with the valve core tube (25), the first air inlet (21) and the valve body tube exhaust port (24) are respectively arranged at two ends of the valve core tube, the valve core tube (25) is connected to an outlet pipe (26) and an exhaust pipe (27), the outlet pipe (26) is provided with the valve body tube outlet (23), and the exhaust pipe (27) is provided with the second air inlet (22).

3. The remote switching nitrogen injection pipeline according to claim 2 is characterized in that: In the ventilation position, the switching valve core (30) blocks the exhaust pipe (27), so that the first air inlet (21) is connected to the valve body pipe outlet (23); in the exhaust position, the switching valve core (30) blocks the first air inlet (21), so that the second air inlet (22) is connected to the valve body pipe exhaust port (24).

4. The remote switching nitrogen injection pipeline according to claim 2 is characterized in that: The main air duct (10) is provided with a curved section (14), the main air inlet (13) is arranged at one end of the main air duct (10), the first outlet (11) is arranged at the other end of the main air duct (10), the axis of the main air inlet (13) is parallel to the axis of the first outlet (11), the second outlet (12) is close to the first outlet (11), and the axis of the second outlet (12) is perpendicular to the axis of the first outlet (11); the outlet pipe (26) is an elbow pipe, the outlet pipe (26) is connected to the valve core pipe (25) at one end close to the first air inlet (21), and the axis of the valve body pipe outlet (23) is parallel to the valve core pipe (25); the exhaust pipe (27) is a U-shaped pipe, the exhaust pipe (27) is connected to the valve core pipe (25) at one end close to the valve body pipe exhaust port (24), and the axis of the second air inlet (22) is perpendicular to the valve core pipe (25).

5. The remote switching nitrogen injection pipeline according to claim 2 is characterized in that: The outlet pipe (26) is provided with a pull rope outlet (28), and the switching pull rope (31) passes through the main air duct (10) and exits from the pull rope outlet (28).

6. The remote switching nitrogen injection pipeline according to claim 1 is characterized in that: The valve body tube (20) is provided with a switching pin (40) and a switching pin guide sleeve (41). The switching pin guide sleeve (41) is arranged perpendicular to the ground. The switching pin (40) is installed in the switching pin guide sleeve (41). In the exhaust position, the switching pin falls and prevents the switching valve core (30) from leaving the exhaust position. A guide sleeve nut (42) is provided on the switching pin guide sleeve (41).

7. The remote switching nitrogen injection pipeline according to claim 1 is characterized in that: The valve body tube (20) is provided with a switching pin (40) and a switching pin guide sleeve (41), the switching pin (40) is installed in the switching pin guide sleeve (41), the switching pin guide sleeve (41) is provided with a guide sleeve nut (42), and a top pressure spring (43) is provided between the guide sleeve nut (42) and the switching pin (40). In the exhaust position, the top pressure spring pushes the switching pin (40) into the valve body tube (20) and prevents the switching valve core (30) from leaving the exhaust position.

8. The remote switching nitrogen injection pipeline according to claim 1 is characterized in that: The switching valve core (30) is provided with a valve core pull ring (32), and the valve core pull ring (32) faces the valve body pipe exhaust port (24).

9. The remote switching nitrogen injection pipeline according to claim 1, characterized in that: The switching pull rope (31) is a steel rope or a steel wire or a nylon rope.

10. The remote switching nitrogen injection pipeline according to claim 1, characterized in that: The remote switching nitrogen injection pipeline is arranged in a transport chute under a coal mine, and the valve body pipe outlet (23) of the valve body pipe (20) at the front end is connected to an end pipe, and the interval between the valve body pipes (20) is 40m.

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