CN103967520B - The efficient automatic water drainage device of a kind of coal mine gas extraction pipeline - Google Patents

Abstract

The invention relates to a high-efficiency automatic water release device for gas drainage pipelines in coal mines, which belongs to the field of coal mine automation, and relates to a high-efficiency automatic water discharge device for gas drainage pipelines, which is used for automatic discharge of water stored in gas drainage pipelines. The water release device is composed of three parts: the water discharge device cylinder assembly, the upper cover assembly and the flat float assembly. It consists of a flat float, a flat float guide rod, and a flat float magnet. The automatic water release device has the characteristics of high water discharge efficiency, simple structure, stable operation, and automatic shutdown when pressure is lost. It can realize efficient, safe, stable, and automatic discharge of water accumulated in the gas drainage pipeline.

Description

A high-efficiency automatic water release device for coal mine gas drainage pipeline

technical field

The invention belongs to the field of coal mine automation, and relates to a high-efficiency automatic water discharge device for a gas drainage pipeline, which is used for automatic discharge of water stored in the gas drainage pipeline.

Background technique

There is a large temperature difference at various points in the coal mine, so a large amount of condensed water will be formed in the pipeline of the gas drainage system. In addition, because the coal seam and the rock formation inevitably contain moisture, a large amount of borehole water will also be generated during the drilling process and enter the pipeline of the gas drainage system. Condensed water and borehole water existing in gas drainage pipelines affect the normal operation of the gas extraction system, increase the extraction resistance and reduce the extraction effect. Under the condition that the other working conditions remain unchanged, the increase of pipeline accumulation will increase the negative pressure of the system, decrease the pressure difference, and increase the gas concentration. When the accumulation of water is serious, it may even lead to interruption of drainage, resulting in gas overrun accidents. Therefore, it is of great significance for the stable and safe operation of the gas drainage system to design a water discharge device with high drainage efficiency, stable performance and safety.

Most of the existing water drains use the gravity, buoyancy, magnetic force of the floating ball, and the negative pressure of the drainage pipeline as the power source, combined with a certain mechanical structure to drive the opening and closing of the water inlet valve and the water discharge valve, so as to realize the water discharge function of the gas drainage pipeline. This mode mainly has three deficiencies: 1. the water discharge efficiency is low. The usual water discharge efficiency is around 10L/min. ②Easy to block. If the water discharge efficiency is low, the flow rate of the water in the water discharge process will be relatively slow, resulting in the easy deposition of dregs in the water. In serious cases, the water discharge port will be blocked and the water discharge device will fail. ③ poor security. When the mechanical structure fails, the water inlet and the water outlet will be opened at the same time, and the drainage pipeline will be connected with the atmosphere, causing the drainage pipeline to lose pressure.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and to invent an automatic water release device for gas drainage pipelines. The invention adopts a single-acting pneumatic ball valve and a double-acting pneumatic ball valve as executive elements for water intake and discharge of the water dispenser to control the water intake and discharge of the water dispenser. Under the action of air source pressure, the water can be released quickly. The opening and closing of the pneumatic ball valve is realized by the action of the air valve, float, magnet and other components. When the water release device operates abnormally or the gas source pressure is too low, the spring in the single-acting pneumatic ball valve acts as an energy storage link to close the water release device to ensure the pressure safety of the gas extraction pipeline. The water discharge device of the present invention has the characteristics of high water discharge efficiency, simple structure, stable operation, automatic shutdown under pressure loss, and the like.

The technical solution adopted in the present invention is a high-efficiency automatic water release device for coal mine gas drainage pipeline, which is characterized in that: the water release device is composed of three parts: water release device cylinder assembly I, upper cover assembly II and flat float assembly III;

Drain cylinder assembly Ⅰ is composed of double-acting pneumatic ball valve 1, single-acting pneumatic ball valve 2, cylinder body 3, and static guide rod 19; Installed at the water inlet a of the cylinder body 3; the lower end of the static guide rod 19 is vertically installed on the bottom of the cylinder body 3 with a vertical threaded hole through the external thread at the bottom, and the upper end of the static guide rod 19 is inserted into a hollow flat floating ball guide Inside the rod 13;

Upper cover assembly II consists of upper cover 4, small upper cover 5, upper cover magnet 6, air valve 7, upper cover pressure plate 8, pressure plate bolt 9, moving guide rod 10, cylindrical pin 11, upper cover bolt 15, upper cover nut 16 , upper cover gasket 17 and sealing ring 18; the air valve 7 is installed on the small upper cover 5 through the upper cover pressure plate 8 and the pressure plate bolt 9; the upper cover magnet 6 is installed on the lower part of the small upper cover 5 through threaded connection, and the dynamic guide The rod 10 is installed on the lower part of the air valve 7 through threaded connection, and the movable guide rod 10 is provided with a cylindrical pin hole perpendicular to its axial direction; the small upper cover 5 is installed in the center hole of the upper cover 4 by welding; the sealing ring 18 Installed on the flange on the upper surface of the cylinder 3, the upper cover 4 and the cylinder 3 are fixedly connected and sealed with the upper cover bolts 15, the upper cover nuts 16 and the upper cover gasket 17;

Flat float assembly III is composed of flat float 12, flat float guide rod 13, and flat float magnet 14; The floating ball 12; the upper cover magnet 6 and the flat floating ball magnet 14 are installed with opposite polarities; the flat floating ball 12 is welded by a thin steel plate to form a closed cylinder; the cylindrical pin 11 is inserted into the cylindrical pin hole of the moving guide rod 10; the moving guide rod 10 Insert in the flat float guide rod 13. This structure limits the relative movement of the stop guide rod 10 and the flat float guide rod 13 in the axial direction, and the relative displacement limit is the length of the flat float guide rod groove.

The beneficial effect of the present invention is that the single-acting pneumatic ball valve and the double-acting pneumatic ball valve are used as the actuators for water intake and discharge of the water release device to control the water intake and discharge of the water release device. The action of other components is realized, and the water can be released quickly under the pressure of the air source. When the water release device operates abnormally or the gas source pressure is too low, the spring in the single-acting pneumatic ball valve acts as an energy storage link to close the water release device to ensure the pressure safety of the gas extraction pipeline. The water discharge device of the present invention is used as a water discharge device for efficient discharge of accumulated water in gas extraction pipelines. It has the characteristics of high water discharge efficiency, simple structure, stable operation, automatic shutdown when pressure is lost, etc., and can realize efficient, safe, stable and automatic gas drainage. Waterlogged pipes.

Description of drawings

Fig. 1 is a schematic view of the internal structure of the water dispenser of the present invention. In the figure: 1 double-acting pneumatic ball valve, 2 single-acting pneumatic ball valve, 3 barrel, 4 upper cover, 5 small upper cover, 6 upper cover magnet, 7 air valve, 8 upper cover pressure plate, 9 pressure plate bolt, 10 moving guide rod , 11 straight pin, 12 flat floating ball, 13 flat floating ball guide rod, 14 flat floating ball magnet, 15 upper cover bolt, 16 upper cover nut, 17 upper cover gasket, 18 sealing ring, 19 static guide rod, a water outlet, b water outlet.

Fig. 2 is a schematic diagram of the installation of the present invention in a gas drainage pipeline. In the figure: 1 balance pressure pipeline, 2 balance pressure valve, 3 gas pipeline, 4 water inlet pipeline valve, 5 water inlet pipeline, 6 gas source.

detailed description

The specific implementation of the patent of the present invention is described in detail below in conjunction with technical scheme and accompanying drawing. Accompanying drawing 2 is the schematic diagram of the installation of the present invention in the gas extraction pipeline, the upper end of the drainer is connected with the gas source 6, and the drainer is connected to the gas pipeline 3 through the balance pressure pipeline 1 and the balance pressure valve 2, and the pipeline accumulates water Enter the water release device through the water inlet pipeline valve 4 and the water inlet pipeline 5.

As shown in Figure 1, in the initial state of the water release device, there is no water and no external air source in the cylinder body 3, and the gravity of the flat float assembly III is greater than the suction force between the upper cover magnet 6 and the flat float magnet 14. Moving guide rod 10, and self is in low position, and single-acting pneumatic ball valve 2 is closed. When the external air source provides sufficient pressure, the single-acting pneumatic ball valve 2 is opened, and the cylinder 3 is under negative pressure, and the double-acting pneumatic ball valve 1 is closed. In the water inlet state, the valve stem is at a low position, and the cylinder 3 has negative pressure. The single-acting pneumatic ball valve 2 remains open, and the double-acting pneumatic ball valve 1 remains closed. The upper surface of the flat float 12 is 20mm higher than the water surface, and the flat float assembly III rise and float. When the distance between the upper cover magnet 6 and the flat float magnet 14 is less than 10 mm, the suction force between the upper cover magnet 6 and the flat float magnet 14 makes the flat float assembly III move up to a high position rapidly. The groove on the flat float guide rod 13 pushes the moving guide rod 10 and the valve core of the air valve 7 to the high position through the cylindrical pin 11, the state of the air valve 7 is switched, the single-acting pneumatic ball valve 2 is closed, and the positive pressure in the cylinder 3 drives the double-acting pneumatic valve. The ball valve 1 is opened, and the water release device is transferred from the water inlet state to the water discharge state. In the state of releasing water, when the sum of 1Kg suction and 1Kg buoyancy is equal to the self-weight of the 2Kg flat float assembly III, the flat float assembly III will disengage from the upper cover magnet 6 and fall. Drop about 49mm out of the magnet suction range, the water surface will rise slightly, but not enough to send the flat float assembly III back to the magnet suction range, and continue to release water. When the upper surface of the flat float 12 is 24mm higher than the water surface, the upper edge of the upper groove of the flat float guide rod 13 touches the cylindrical pin 11, because the positive pressure in the cylinder body 3 is at least 0.3MPa at this time, the upward movement of the movable guide rod 10 The pressure is about 2.4Kg, which is greater than the self-weight of the flat float assembly III, so the float will no longer move down, and the water discharge will continue. When the water surface falls below the upper end of the water discharge port b, the cylinder 3 loses pressure, and when the pressure is less than 0.25MPa, the flat float assembly III falls to a low position, the single-acting pneumatic ball valve 2 is opened, the double-acting pneumatic ball valve 1 is closed, and the water release device enters the water inlet state. So far, complete a cycle of entering and discharging water.

Through experiments and field tests, the water discharge speed of the water discharge device reaches 100-500L/min, which greatly improves the water discharge efficiency. And it has stable performance and high reliability in use.

Claims (1)

1. a coal mine gas extraction pipeline automatic water drainage device, is characterized in that: tailrace is made up of tailrace cylinder assembly (I), cover assembly (II) and flat floating ball component (III) three part;

Tailrace cylinder assembly (I) is made up of double acting pneumatic ball valve (1), single-acting pneumatic ball valve (2), cylindrical shell (3), quiet guide rod (19); Double acting pneumatic ball valve (1) is installed on dewatering outlet (b) place of cylindrical shell (3), and single-acting pneumatic ball valve (2) is installed on water inlet (a) place of cylindrical shell (3); Quiet guide rod (19) lower end is vertically installed on cylindrical shell (3) bottom with vertical screwed hole by the external screw thread bottom it, and quiet guide rod (19) upper end is inserted in the flat ball float guide rod (13) of hollow;

Cover assembly (II) is made up of upper cover (4), little upper cover (5), upper cover magnet (6), air valve (7), cover clamp (8), follower bolt (9), dynamic guide rod (10), straight pin (11), upper bonnet bolt (15), upper box nut (16), upper lid gasket (17), sealing ring (18); Air valve (7) is installed on little upper cover (5) by cover clamp (8) and follower bolt (9); Upper cover magnet (6) is installed on the bottom of little upper cover (5) by thread connection, dynamic guide rod (10) is installed on the bottom of air valve (7) by thread connection, and dynamic guide rod (10) has the cylinder pin hole vertical with its axis direction; Little upper cover (5) is installed in the centre bore of upper cover (4) by the mode of welding; Sealing ring (18) is arranged on the flange of cylindrical shell (3) upper surface, with upper lid gasket (17) with bonnet bolt (15), upper box nut (16) upper cover (4) is fixedly connected with cylindrical shell (3) and is sealed;

Flat floating ball component (III) is made up of flat ball float (12), flat ball float guide rod (13), flat ball float magnet (14); Flat ball float guide rod (13) hollow is also slotted, and upper end is by the flat ball float magnet (14) of thread connection, and lower end is welded in flat ball float (12); Upper cover magnet (6) and flat ball float magnet (14) polarity are installed in opposite directions; Flat ball float (12) is welded by steel sheet and forms closing cylinder; Straight pin (11) inserts in the cylinder pin hole of dynamic guide rod (10); Dynamic guide rod (10) injects in flat ball float guide rod (13); Tailrace upper end is connected with source of the gas (6).