Mine negative pressure automatic water drainer

Abstract

The utility model discloses a mine negative pressure automatic water drainer belongs to mine gas auxiliary processing equipment device technical field, it includes hollow casing, water inlet pipe, drain pipe and top cap, is equipped with negative pressure balance valve and inlet valve on the top cap, is equipped with the push rod subassembly of connection through chain and the bucket in the inside. The casing is the round tub structure of annular groove, and the lower part is funnel -shaped, is equipped with the outrigger outside, and the top cap adopts transparent material to be convenient for observation. The water drainer utilizes bucket to drive push rod action with water level float, and through magnetic coupling and mechanical linkage control inlet valve and negative pressure balance valve's opening and closing, realizes the automatic discharge of ponding and sealing recovery under the negative pressure state. It is high, the sealing is good, the corrosion resistance is strong, need not external power to realize reliable automatic drainage, and effectively guarantee the smooth of gas drainage pipeline and drainage system safe and stable operation.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary treatment equipment for mine gas, specifically to a mine negative pressure automatic water discharge device. Background Technology

[0002] Gas drainage is a crucial aspect of safe coal mine production, used to effectively reduce underground gas concentration and prevent explosions caused by gas accumulation. In gas drainage systems, drainage pipelines often contain significant amounts of water, primarily originating from natural water content in the coal seam, water used for underground dust suppression spraying, and groundwater inflow. If this water cannot be drained promptly, it can clog pipelines, increase drainage resistance, severely impact drainage efficiency, and even lead to system failure, threatening mine safety.

[0003] Currently, the gas drainage pipeline water discharge devices commonly used in coal mines are mostly mechanical or manual drainage structures, which suffer from problems such as low automation, untimely drainage, poor sealing performance, susceptibility to corrosion, and frequent maintenance. Some existing water dischargers have insufficient structural strength and small volume, making it difficult to meet the requirements of high negative pressure, large flow, and long-term continuous operation. They also lack an effective negative pressure balancing mechanism, resulting in inaccurate water discharge and low reliability.

[0004] Therefore, there is an urgent need for a fully automatic negative pressure water discharge device with a reasonable structure, strong corrosion resistance, reliable operation, and suitability for the harsh environment of underground coal mines, so as to achieve efficient and stable automatic drainage function and ensure the continuous and safe operation of the gas drainage system. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a mine negative pressure automatic water discharge device to solve the problems of low automation, untimely drainage, poor sealing, easy corrosion and unreliability in operation of existing water discharge devices.

[0006] To solve the above problems, this utility model provides the following technical solution:

[0007] An automatic negative pressure water discharge device for mining includes a hollow shell; several support legs are provided on the lower side of the shell; an inlet pipe and a outlet pipe communicating with the inner cavity are respectively installed on the upper side and bottom of the shell; an inlet valve and a outlet valve are respectively installed on the inlet pipe and the outlet pipe; a top cover is installed on the top of the shell; a negative pressure balancing valve communicating with the inner cavity of the shell is provided on the top cover; the other end of the negative pressure balancing valve and the inlet pipe are respectively connected to a gas extraction pipe; a U-shaped plate is provided on the lower side of the top cover; the two protruding ends of the U-shaped plate are inverted and installed on the top cover; a push rod assembly that can move along the height direction of the shell is installed on the U-shaped plate; an air hole is opened on the top cover at the position opposite to the push rod; an air inlet valve is installed at the air hole; the movement of the push rod assembly can control the opening and closing of the air inlet valve; a float is installed on the lower side of the push rod assembly via a chain.

[0008] The shell is a cylindrical structure with several annular grooves on its outer periphery; a shell flange is provided on the outer periphery of the top of the shell; a sealing ring is installed on the shell flange; a top cover is provided on the positioning shell flange, and a flange ring is also provided on the top cover; the top cover, shell flange and flange ring are detachably connected by a bolt assembly; several ribs are also provided between the shell flange and the outer side wall of the shell.

[0009] The lower side of the shell is funnel-shaped, and the water drain pipe is located in the middle of the lower side of the shell; there are three support legs, and the tail end of the water drain pipe is set towards the gap between two support legs; the support leg is an arc-shaped plate component, and one side of the arc-shaped plate is welded to the bottom of the shell; the shell and the support legs are integrally formed.

[0010] The negative pressure balance valve, U-shaped plate, and air intake valve are all located in the middle of the top cover. The top cover is made of transparent material and has a flat structure.

[0011] The float is a hollow cylindrical component with an outer diameter smaller than the inner diameter of the shell; a hanging and fixing nut is provided on the top surface of the float; the lower end of the chain is connected to this point by bolts.

[0012] The central guide rod is shaped like a rod with a larger upper end and a smaller lower end. A guide hole is located in the middle of the U-shaped plate, through which the lower end of the central guide rod passes, facing the float. A chain connects the central guide rod and the float. A sealing silicone pad is located on the side of the central guide rod facing the negative pressure balance valve. The lower side of the negative pressure balance valve has a conical structure. When the central guide rod is raised to its maximum position, the sealing silicone pad seals the lower side of the negative pressure balance valve. There are two air intake valves. A strip plate is located at the upper end of the central guide rod. Push rods are located on both sides of the strip plate. One end of each push rod is movably connected to the air intake valve. A pair of magnets are mounted on each push rod; one magnet is located at the bottom of the air intake valve, and the other is located on the strip plate. When the two magnets attract each other, the weight of the float overcomes the attraction between the two pairs of magnets, separating them.

[0013] The beneficial effects of this utility model are reflected in the following aspects:

[0014] 1. Structural strength and volume optimization: The shell adopts a cylindrical structure and adds an annular groove, which significantly enhances the overall rigidity and resistance to negative pressure; the funnel-shaped design at the bottom combined with the arrangement of the drain pipe in the middle facilitates the rapid collection and discharge of accumulated water, expands the effective volume, and meets the needs of large flow drainage.

[0015] 2. Lightweight and improved corrosion resistance: The overall weight is only 10.5kg, which is convenient for underground installation and maintenance; the main structure is made of stainless steel, which has excellent corrosion resistance and durability, and is suitable for high humidity and high corrosive coal mine environments.

[0016] 3. Excellent sealing performance: Through the use of materials such as shell flange, flange ring and sealing ring and multiple sealing design, the connection between the top cover and the shell is ensured to be tight; the tapered structure at the lower end of the negative pressure balance valve cooperates with the sealing silicone gasket on the central guide rod to effectively isolate airflow and prevent leakage under negative pressure.

[0017] 4. Reliable automated control: The float moves with the water level, driving the central guide rod. Through the dual action of magnetic coupling and mechanical linkage, the opening and closing of the air inlet valve and the negative pressure balance valve are precisely controlled, realizing fully automatic drainage circulation without external power or manual intervention. It is responsive and reliable.

[0018] 5. Convenient maintenance and intuitive observation: The top cover is made of high-strength transparent engineering PVC plastic, which makes it easy to directly observe the internal water level and mechanism operation; the modular assembly structure and detachable connection design simplify the maintenance and parts replacement process.

[0019] 6. Strong applicability and flexible installation: Supports a wide negative pressure range of 0 to -0.03MPa, and the water discharge rate can reach 10~90L / min; the outrigger structure is stable and avoids the direction of drainage, adapting to uneven ground installation in the well, ensuring the overall stability and practicality of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention in an embodiment;

[0021] Figure 2 yes Figure 1 A side sectional view of the device;

[0022] Figure 3 yes Figure 1 A schematic diagram of the structure of the central device after the top cover has been removed;

[0023] Figure 4 This is an installation diagram of the negative pressure balance valve, air intake valve, U-shaped plate, push rod assembly and float in this embodiment;

[0024] Figure 5 yes Figure 4 A schematic diagram of the device from another perspective;

[0025] Explanation of reference numerals in the attached drawings: 1. Shell, 2. Support leg, 3. Inlet pipe, 4. Outlet pipe, 5. Inlet valve, 6. Drain valve, 7. Top cover, 8. Negative pressure balance valve, 9. U-shaped plate, 10. Push rod assembly, 11. Air inlet valve, 12. Float, 13. Shell flange, 14. Sealing ring, 15. Flange ring, 16. Rib, 101. Center guide rod, 102. Sealing silicone gasket, 103. Strip plate, 104. Push rod, 105. Magnet. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Example:

[0028] Reference Figure 1 This embodiment provides a mine negative pressure automatic water discharge device; it includes a hollow shell 1; several support legs 2 are provided on the lower side of the shell 1; an inlet pipe 3 and a drain pipe 4 communicating with the inner cavity are respectively installed on the upper side and bottom of the shell 1; an inlet valve 5 and a drain valve 6 are respectively installed on the inlet pipe 3 and the drain pipe 4; a top cover 7 is installed on the top of the shell 1; a negative pressure balance valve 8 communicating with the inner cavity of the shell 1 is provided on the top cover 7; the other end of the negative pressure balance valve 8 and the inlet pipe 3 are respectively connected to a gas extraction pipe; a U-shaped plate 9 is provided on the lower side of the top cover 7; The two protruding ends of the U-shaped plate 9 are inverted and installed on the top cover 7; a push rod assembly 10 that can move along the height direction of the housing 1 is installed on the U-shaped plate 9; an air hole is opened on the top cover 7 at a position opposite to the push rod 10; an air inlet valve 11 is installed at the air hole; the movement of the push rod assembly 10 can control the opening and closing of the air inlet valve 11; a float 12 is installed on the lower side of the central guide rod 101 via a chain. The housing 1 is made of corrosion-resistant stainless steel to ensure that it will not rust during long-term use in humid and corrosive gas environments underground; the water inlet pipe 3 and the water outlet pipe 4 are welded to the housing 1 to ensure connection strength and sealing; the float 12 is made of lightweight corrosion-resistant material. Specifically, in this embodiment, the float 12 is made of thin-walled stainless steel, which has sufficient buoyancy and durability; it can float stably in accumulated water and achieve reliable linkage with the push rod assembly 10 via a chain.

[0029] The housing 1 is a cylindrical structure with several annular grooves on its outer periphery. A housing flange 13 is provided on the outer periphery of the top of the housing 1. A sealing ring 14 is installed on the housing flange 13. A top cover 7 is installed on the housing flange 13, and a flange ring 15 is also provided on the top cover 7. The top cover 7, housing flange 13, and flange ring 15 are detachably connected by a bolt assembly. Several ribs 16 are also provided between the housing flange 13 and the outer side wall of the housing 1. The annular grooves not only enhance the structural rigidity of the housing but also help to increase the heat dissipation area. The ribs 16 are evenly distributed around the top of the housing, further improving the strength and deformation resistance of the top cover mounting area. The sealing ring 14 is made of oil-resistant, anti-aging, and high-quality sealing rubber material, ensuring good sealing even under frequent opening and closing and negative pressure conditions.

[0030] The lower side of the shell 1 is funnel-shaped, and the drain pipe 4 is located in the middle of the lower side of the shell 1. There are three support legs 2, with the tail end of the drain pipe 4 facing the gap between two support legs 2. The support legs 2 are arc-shaped plate components, with one side of the arc-shaped plate welded to the bottom of the shell 1. The shell 1 and the support legs 2 are integrally formed structures. The funnel-shaped design facilitates the rapid collection and guidance of accumulated water to the drain pipe, effectively preventing water residue. The structural design of the support legs 2 provides a larger support area, enhancing the stability of the equipment when placed on uneven ground underground. At the same time, the drain pipe outlet faces the gap between the support legs, facilitating the connection of the drain pipe and avoiding impacts.

[0031] The negative pressure balancing valve 8, the U-shaped plate 9, and the air inlet valve 11 are all located in the middle of the top cover 7. The top cover 7 is made of high-strength transparent engineering PVC plastic, which facilitates direct observation of internal water level changes and float movement, while also possessing sufficient mechanical strength and sealing performance; the U-shaped plate 9 is fixed to the lower side of the top cover with bolts, providing reliable guidance and support for the push rod assembly.

[0032] The float 12 is a hollow cylindrical component with an outer diameter smaller than the inner diameter of the shell 1. A hanging and fixing nut is provided on the top surface of the float 12; the lower end of the chain is connected to this point by bolts. The lugs and the chain are connected movably to prevent the float from jamming or tilting during movement.

[0033] The push rod assembly 10 includes a central guide rod 101, which is larger at the top and smaller at the bottom. A guide hole is opened in the middle of the U-shaped plate 9, and the lower end of the central guide rod 101 passes through the guide hole and is positioned directly opposite the float 12. A chain connects the central guide rod 101 and the float 12. A sealing silicone pad 102 is provided on the side of the central guide rod 101 facing the negative pressure balance valve 8. The lower side of the negative pressure balance valve 8 has a conical structure. When the push rod assembly 10 is raised to its position, the sealing silicone pad 102 can seal the lower side of the negative pressure balance valve 8. There are two air inlet valves 11. A strip plate 103 is provided at the upper end of the central guide rod 101. Push rods 104 are provided on both sides of the strip plate 103. One end of the push rod 104 is movably connected to the air inlet valve 11. A pair of magnets 105 are provided on the push rod 104. One magnet 105 is located at the bottom of the air inlet valve 11, and the other magnet is located on the strip plate 103. When the two magnets attract each other, the weight of the float 12 can overcome the attraction between the two magnets 105 and separate them. The central guide rod 101 of the push rod assembly 10 moves up and down in the guide hole of the U-shaped plate to ensure accurate movement trajectory. The sealing silicone gasket 102 is made of wear-resistant and elastic rubber material, which can form a reliable seal with the conical structure at the lower end of the negative pressure balance valve. The magnets 105 are made of strong magnetic material to ensure that the air inlet valve can be quickly attracted when the float rises and can be reliably separated when the float sinks due to water level drop, realizing the rapid opening and closing of the air inlet valve.

[0034] The main technical specifications of the negative pressure automatic water discharge device in this embodiment are as follows:

[0035] 1. Applicable pressure range: 0~-0.03MPa;

[0036] 2. Automatic water discharge rate: 10~90L / min (intermittent water discharge);

[0037] 3. External dimensions (diameter × height): approximately Φ300*520mm;

[0038] 4. Weight: 10.5KG.

[0039] During installation, place the automatic negative pressure drainer in a low-lying area of ​​the pipeline; install a valve on each branch pipe connecting the gas extraction pipe to the water inlet pipe and the negative pressure balance valve, so that the drainer can be disconnected from the extraction pipeline when maintenance is required; the center line of the drainer should be as vertical as possible, with a vertical deviation from the horizontal within ±5°. Before installation, check that all interfaces and seals are intact and free from transportation damage; avoid violent impacts during installation to prevent the transparent top cover from cracking or internal components from shifting.

[0040] Its working principle is as follows:

[0041] (1) Water accumulation stage:

[0042] The inlet pipe and negative pressure balance pipe of the drain device are both connected to the gas pipeline, and the negative pressure balance valve and inlet valve are open. The float and push rod assembly are in a low position under the action of gravity. Under the action of negative pressure, the air inlet valve and drain valve are both closed. The inlet valve opens under the pressure of the water column entering the water pipe, and the water in the pipeline enters the drain device through the inlet valve, and water begins to accumulate.

[0043] (2) Automatic discharge:

[0044] As the water level rises, the buoyancy of the float gradually increases. When the float touches the central guide rod, the weight of the strip plate and the central guide rod causes the float to temporarily stop moving. The water continues to accumulate, the water level continues to rise, and the buoyancy of the float gradually increases. When the buoyancy exceeds the sum of the weights of the float, the strip plate, and the central guide rod, the float continues to rise with the increasing water level. When the float rises to a certain height, the distance between the magnet fixed to the strip plate and the magnet fixed to the bottom of the air inlet valve reaches the specified value. Under the mutual coupling of magnetic forces, the magnet on the strip plate, along with the strip plate and the central guide rod, is attracted up. At this time, the sealing silicone gasket on the central guide rod blocks the negative pressure balance valve, and the push rod on the side opens the air inlet valve, allowing the drain valve to communicate with the atmosphere. The drain valve automatically closes under the pressure difference between the inside and outside of the drain valve, isolating the drain valve from the pumping pipeline.

[0045] After air enters the drain valve, the pressure inside the cylinder quickly equalizes with the atmospheric pressure outside. Under the action of the hydrostatic pressure inside the cylinder, the drain valve is opened, and water begins to drain.

[0046] (3) Resume the loop:

[0047] As water continues to flow out, the water level drops, causing the float to descend as well. This opens the negative pressure balancing valve, reconnects the drain valve to the gas pipeline, and automatically closes the air inlet and outlet valves due to the internal and external pressure difference. The float then returns to its initial position. The system re-establishes a negative pressure closed state, waiting for sufficient water to accumulate before activating the discharge mechanism. This cycle relies entirely on the buoyancy of the float and changes in negative pressure for automatic mechanical control, requiring no external power or manual operation, making it particularly suitable for explosion-proof environments in underground coal mines.

[0048] This mine negative pressure automatic water discharger demonstrates high reliability and adaptability in practical applications, and is particularly suitable for underground environments with high humidity and high methane concentrations. Its structural design fully considers the special working conditions in coal mines; for example, its compact structure facilitates installation and maintenance in narrow tunnels; all exposed components are rust-proofed or made of stainless steel, effectively extending their service life.

[0049] The equipment requires no external power during operation, relying entirely on pipeline negative pressure and buoyancy for automatic control, meeting the explosion-proof requirements for safe coal mine production. Simultaneously, the transparent top cover design allows staff to directly observe the internal water level and operational status of the equipment, facilitating daily inspections and fault diagnosis.

[0050] To further improve equipment performance, it is recommended to perform regular maintenance and inspections on the drain valve. This mainly includes cleaning the inner wall of the casing and the float, checking whether the sealing ring and sealing silicone gasket are aging or worn, and confirming that the magnetic attraction is normal. When not in use for a long period of time, the valves on the inlet pipe and the negative pressure balance valve should be closed, and the water inside the equipment should be drained.

Claims

1. A mine negative pressure automatic water discharge device, characterized in that: It includes a hollow shell (1); several legs (2) are provided on the lower side of the shell (1); an inlet pipe (3) and a drain pipe (4) communicating with the inner cavity are respectively installed on the upper side and bottom of the shell (1); an inlet valve (5) and a drain valve (6) are respectively installed on the inlet pipe (3) and the drain pipe (4); a top cover (7) is installed on the top of the shell (1); a negative pressure balance valve (8) communicating with the inner cavity of the shell (1) is provided on the top cover (7); the other end of the negative pressure balance valve (8) and the inlet pipe (3) are respectively connected to the gas extraction pipe; a U-shaped plate (9) is provided on the lower side of the top cover (7). The two protruding ends of the U-shaped plate (9) are inverted and set on the top cover (7); a push rod assembly (10) that can move along the height direction of the shell (1) is installed on the U-shaped plate (9); an air hole is opened on the top cover (7) at a position opposite to the push rod assembly (10); an air inlet valve (11) is installed at the air hole; the movement of the push rod assembly (10) can control the opening and closing of the air inlet valve (11); a float (12) is installed on the lower side of the push rod assembly (10) via a chain.

2. The automatic negative pressure water discharge device for mines according to claim 1, characterized in that: The shell (1) is a cylindrical structure with several annular grooves on the outer periphery of the shell (1); a shell flange (13) is provided on the outer periphery of the top of the shell (1); a sealing ring (14) is installed on the shell flange (13); a top cover (7) is provided on the shell flange (13), and a flange ring (15) is also provided on the top cover (7); the top cover (7), the shell flange (13) and the flange ring (15) are detachably connected by bolt assembly; several ribs (16) are also provided between the shell flange (13) and the outer side wall of the shell (1).

3. The automatic negative pressure water discharge device for mines according to claim 1, characterized in that: The lower side of the shell (1) is funnel-shaped, and the water pipe (4) is located in the middle of the lower side of the shell (1); there are three support legs (2), and the tail end of the water pipe (4) is installed facing the gap between the two support legs (2); the support leg (2) is an arc-shaped plate component, and one side of the arc-shaped plate is welded to the bottom of the shell (1); the shell (1) and the support leg (2) are integrally formed structures.

4. The automatic negative pressure water discharge device for mines according to claim 1, characterized in that: The top cover (7) is a flat plate structure made of transparent material; the negative pressure balance valve (8), U-shaped plate (9) and air intake valve (11) are all located in the middle of the top cover (7).

5. The automatic negative pressure water discharge device for mines according to claim 1, characterized in that: The float (12) is a hollow cylindrical component with an outer diameter smaller than the inner diameter of the shell (1); a hanging fixing nut is installed on the top surface of the float (12); the lower end of the chain is connected there by bolts.

6. The automatic negative pressure water discharge device for mines according to claim 1, characterized in that: The push rod assembly (10) includes a central guide rod (101) that is larger at the top and smaller at the bottom; a guide hole is opened in the middle of the U-shaped plate (9), and the lower end of the central guide rod (101) passes through the guide hole and is positioned directly opposite the float (12), with a chain connecting the central guide rod (101) and the float (12); a sealing silicone pad (102) is provided on the side of the central guide rod (101) facing the negative pressure balance valve (8); the lower side of the negative pressure balance valve (8) has a conical structure; when the push rod assembly (10) is raised to the position, the sealing silicone pad (102) can seal the lower side of the negative pressure balance valve (8). There are two intake valves (11); a strip plate (103) is provided at the upper end of the central guide rod (101); push rods (104) are provided on both sides of the strip plate (103); one end of the push rod (104) is movably connected to the intake valve (11); a pair of magnets (105) are provided on the push rod (104); one magnet (105) is provided at the bottom of the intake valve (11), and the other magnet is provided on the strip plate (103); when the two magnets attract each other, the weight of the float (12) can overcome the attraction between the two pairs of magnets (105) and separate them.

Images