CN115898517B - High negative pressure water-saving coal mine gas extraction system - Google Patents

Abstract

A high negative pressure water-saving coal mine gas extraction system belongs to the technical field of water ring vacuum pumps. The method is characterized in that: the output port of the primary water ring vacuum pump (1) is communicated with the input port of the secondary water ring vacuum pump (2), the output port of the secondary water ring vacuum pump (2) is communicated with the input port of the gas-liquid separator (11), the air outlet of the gas-liquid separator (11) is communicated with the input port of the air supplementing device, the air supplementing port (2503) of the air supplementing device is communicated with the input port of the primary water ring vacuum pump (1), the input port of the working fluid circulating device is communicated with the liquid outlet of the gas-liquid separator (11), and the output port of the working fluid circulating device is communicated with the liquid inlets of the primary water ring vacuum pump (1) and the secondary water ring vacuum pump (2). The two-stage water ring vacuum pump can improve the gas extraction negative pressure, the working fluid circulating device can save a large amount of water, and the air supplementing device can ensure that the gas pump is smoother to use.

Description

High negative pressure water-saving coal mine gas extraction system

Technical Field

A high negative pressure water-saving coal mine gas extraction system belongs to the technical field of water ring vacuum pumps.

Background

The water ring vacuum pump is a generic name of a water ring vacuum pump and a water ring compressor, and is a fluid machine for conveying gas. The water ring vacuum pump and the compressor have the same structure and working principle, and only differ in use. When the vacuum pump is used as a compressor, the air is compressed to a certain pressure in the pump and then is discharged into the system connected with the pump outlet, so that the inlet of the compressor is in the atmospheric condition. When the water ring vacuum pump is used for sucking and discharging gas in a coal mine, the inlet and the outlet of the water ring vacuum pump are connected with a gas pipeline, the gas in the coal body is sucked by the aid of the vacuum characteristic of the water ring vacuum pump, and the gas is pressed into a ground gas transmission pipeline by the aid of the compression characteristic of the water ring vacuum pump so as to be supplied to a user.

When the existing water ring vacuum pump is used for pumping gas, the following technical problems exist: 1) The water ring vacuum pump can only perform primary compression, has low negative pressure and constant delivery pressure, and cannot realize the regulation of output pressure; 2) The water ring vacuum pump can produce heat when working, and after a period of working time, the temperature of the working fluid of the water ring vacuum pump can rise, and the temperature rise can influence the transportation of gas, leads to the gas transportation to have the potential safety hazard.

Disclosure of Invention

The invention aims to solve the technical problems that: the high negative pressure water-saving coal mine gas extraction system has the advantages that the defects of the prior art are overcome, two-stage compression can be realized, one-stage compression can be realized, negative pressure can be improved, and the defect of insufficient air intake is avoided.

The technical scheme adopted for solving the technical problems is as follows: the high negative pressure water-saving coal mine gas extraction system is characterized in that: the device comprises a primary water ring vacuum pump, a secondary water ring vacuum pump, a gas-liquid separator, a gas supplementing device and a working fluid circulating device, wherein an output port of the primary water ring vacuum pump is communicated with an input port of the secondary water ring vacuum pump, an output port of the secondary water ring vacuum pump is communicated with an input port of the gas-liquid separator, an output port of the gas-liquid separator is communicated with an input port of the gas supplementing device, a gas supplementing port of the gas supplementing device is communicated with an input port of the primary water ring vacuum pump, an input port of the working fluid circulating device is communicated with a liquid outlet of the gas-liquid separator, and an output port of the working fluid circulating device is communicated with liquid inlets of the primary water ring vacuum pump and the secondary water ring vacuum pump.

Preferably, the working fluid circulating device comprises a delivery pump, a reversing device, a heat exchanger and a buffer tank, wherein an input port of the delivery pump is communicated with a liquid outlet of the gas-liquid separator, an output port of the delivery pump is communicated with an input pipe of the reversing device, an output pipe of the reversing device is connected with the buffer tank in series and then is communicated with liquid inlets of the primary water ring vacuum pump and the secondary water ring vacuum pump, a tube side inlet of the heat exchanger is communicated with a first liquid outlet of the reversing device, a tube side outlet of the heat exchanger is communicated with a second liquid inlet of the reversing device, the first liquid inlet of the reversing device is connected with a liquid supplementing pipe, and a second liquid outlet of the reversing device is connected with an emptying pipe;

when the input pipe is communicated with the first liquid outlet, the output pipe is communicated with the second liquid inlet; when the input pipe is communicated with the second liquid outlet, the first liquid inlet is communicated with the first liquid outlet, and the output pipe is communicated with the second liquid inlet. The working solution separated by the gas-liquid separator is conveyed into the buffer tank through the conveying pump, the working solution in the buffer tank enters the primary water ring vacuum pump and the secondary water ring vacuum pump under the self-suction effect of the primary water ring vacuum pump, the heat exchanger can cool the working solution, the working temperature of the primary water ring vacuum pump and the working temperature of the secondary water ring vacuum pump are prevented from rising, the reversing device can enable the working solution conveyed by the conveying pump to enter the buffer tank through the heat exchanger, the working solution conveyed by the fluid supplementing pipe can also enter the buffer tank through the heat exchanger, and meanwhile the working solution conveyed by the conveying pump is discharged through the emptying pipe, so that the replacement of the working solution is realized.

Preferably, the reversing device comprises a reversing valve body and a reversing valve core, the reversing valve core is rotatably arranged in the reversing valve body, a first liquid inlet and a second liquid inlet are arranged on two opposite sides of the reversing valve body, the first liquid inlet and the second liquid inlet are opposite to each other, the first liquid outlet and the second liquid outlet are arranged on two opposite sides of the reversing valve body, the first liquid outlet and the second liquid outlet are opposite to each other, and a first channel and a second channel are arranged on the reversing valve core;

when the first channel enables the input pipe to be communicated with the first liquid outlet, the output pipe is communicated with the second liquid inlet; when the second channel enables the input pipe to be communicated with the second liquid outlet, the first liquid inlet is communicated with the first liquid outlet, and the output pipe is communicated with the second liquid inlet. The rotation of the first channel and the second channel can be realized by rotating the reversing valve core, and the switching between the circulation of working fluid and the replacement of the working fluid can be realized, so that the regulation is convenient.

Preferably, the first channel comprises a first input channel and a first output channel, the inner end of the first input channel is communicated with the output pipe, and the outer end of the first input channel is positioned at the side part of the reversing valve core; the inner end of the first output channel is communicated with the input pipe, the outer end of the first output channel is arranged on the side part of the reversing valve core, and the outer end of the first input channel and the outer end of the first output channel are positioned on the same side of the reversing valve core. The first input channel is used for communicating the output pipe with the second liquid inlet, the first output channel is used for communicating the input pipe with the first liquid outlet, so that working liquid output by the conveying pump is discharged into the heat exchanger tube side through the first liquid outlet, and the working liquid in the heat exchanger tube side is discharged through the second liquid inlet and is output through the output pipe.

Preferably, the second channel comprises a communication channel, a second input channel and a second output channel, one end of the second input channel is communicated with the output pipe, the other end of the second input channel is arranged on the side part of the reversing valve core, the second input channel and the first input channel are arranged at intervals in the circumferential direction, one end of the second output channel is communicated with the input pipe, the other end of the second output channel is arranged on the side part of the reversing valve core, the second output channel and the first output channel are arranged at intervals in the circumferential direction, two ends of the communication channel are respectively arranged on two opposite sides of the reversing valve core, and two ends of the communication channel are respectively opposite to the second output channel and the second input channel and are respectively arranged on two opposite sides of the reversing valve core with the second output channel and the second input channel. The communication channel can be with first inlet and first liquid outlet intercommunication, and the second input channel is with second inlet and output tube intercommunication, and the second output channel is with input tube and second liquid outlet intercommunication, makes delivery pump output and evacuation pipe intercommunication, and fluid replacement pipe and tube side entry intercommunication have realized the replacement of working fluid.

Preferably, the reversing device further comprises a worm wheel and a worm, the worm wheel is coaxially sleeved outside the reversing valve core, the worm wheel and the reversing valve core keep synchronously rotating, the worm is rotatably arranged on the reversing valve body, the worm is meshed with the worm wheel, and a hand wheel is arranged on the worm. The worm and gear mechanism is used for adjusting the reversing valve core, so that the position of the reversing valve core after adjustment is stable, and the reversing valve core is prevented from freely rotating under the action of pressure.

Preferably, the air supplementing device comprises an air supplementing valve main body, a sealing shaft and a compression spring, wherein an air supplementing inlet communicated with an air outlet of the air-liquid separator is formed in the bottom of the air supplementing valve main body, an air supplementing outlet and an air supplementing opening are formed in two ends of the air supplementing valve main body, the air supplementing inlet is simultaneously communicated with the air supplementing outlet and the air supplementing opening, the sealing shaft is slidably arranged in the air supplementing valve main body, an air supplementing cavity is formed between the sealing shaft and the air supplementing opening, an air outlet channel for communicating the air supplementing inlet with the air supplementing outlet is formed in the sealing shaft, an air supplementing groove is formed in the inner wall of the air supplementing valve main body, one end of the air supplementing groove is communicated with the air supplementing cavity, the other end of the air supplementing groove extends between the sealing shaft and the inner wall of the air supplementing valve main body, an air supplementing hole is formed in the sealing shaft, one end of the air supplementing hole is communicated with the air outlet channel, the other end of the air supplementing hole is arranged on one side of the air supplementing groove away from the air supplementing opening at intervals, and the compression spring is arranged at one end of the sealing shaft close to the air supplementing opening, and the air supplementing opening is communicated with the air inlet of the secondary pump body. The compression spring pushes the sealing shaft to compress the air supplementing air outlet, so that the air outlet channel is communicated with the air supplementing air inlet and the air supplementing air outlet, when negative pressure is generated at the air supplementing opening, the sealing shaft moves in the direction close to the air supplementing opening, and at the moment, the air supplementing hole is communicated with the air supplementing channel and the air supplementing groove, so that the air supplementing channel is communicated with the air supplementing cavity, and the air supplementing cavity supplements air for the primary water ring vacuum pump.

Preferably, an air inlet groove is formed in one side, close to the air supplementing air inlet, of the sealing shaft, and the air supplementing air inlet is communicated with the air outlet channel through the air supplementing groove. The air inlet groove can enable the air outlet channel and the air supplementing air inlet to maintain a communication state when the sealing shaft moves.

Preferably, the air compensating valve body comprises an air compensating valve body and an air compensating valve core, the air compensating valve core is rotatably arranged in the air compensating valve body, a mounting hole penetrating through the air compensating valve core is arranged in the air compensating valve core, the sealing shaft is slidably arranged in the mounting hole, two ends of the mounting hole are respectively communicated with the air compensating port and the air compensating outlet, and a communication hole for communicating an air outlet channel of the air compensating air inlet is arranged at the bottom of the air compensating valve core. The air supplementing valve core is rotatably arranged in the air supplementing valve body, and the two ends of the mounting hole can be staggered with the air supplementing port and the air supplementing outlet respectively by rotating the air supplementing valve core, so that the whole air supplementing valve body is disconnected, and the function of the stop valve is realized.

Compared with the prior art, the invention has the following beneficial effects:

this high negative pressure water conservation colliery gas drainage system carries out secondary compression through the water ring vacuum pump of one-level to the gas after the compression, and the gas after the secondary compression is sent into in the gas-liquid separator, and two-stage water ring vacuum pump can improve the gas and take out the negative pressure, and working solution circulating device can send back the working solution that gas-liquid separator separated into in one-level water ring vacuum pump and the water ring vacuum pump of second grade, and air supplementing device can be with the high-pressure gas of output to the air supplement in the water ring vacuum pump of one-level to avoid the air input in the water ring vacuum pump of one-level not enough and influence the problem of work, guarantee that this high negative pressure water conservation colliery gas drainage system uses more smoothly.

Drawings

FIG. 1 is a schematic top view of a high negative pressure water saving coal mine gas extraction system.

Fig. 2 is a schematic structural view of the working fluid circulating device.

Fig. 3 is a schematic front cross-sectional view of a dispenser.

Fig. 4 is a schematic front cross-sectional view of the docking tube.

Fig. 5 is a schematic front sectional view of the communication pipe.

Fig. 6 is a schematic front cross-sectional view of the reversing device.

Fig. 7 is a right side cross-sectional schematic view of a reversing valve cartridge.

FIG. 8 is a schematic front cross-sectional view of the air make-up valve.

Fig. 9 is a schematic front cross-sectional view of a surge tank.

FIG. 10 is a schematic diagram of a gas-liquid separator in front cross-section.

Fig. 11 is a schematic perspective view of a separator plate.

In the figure: 1. the primary water ring vacuum pump 2, the secondary water ring vacuum pump 3, the separation liquid inlet chamber 4, the reversing device 5, the input pipe 6, the distributor body 7, the air inlet chamber 8, the exhaust chamber 801, the high-pressure air inlet pipe 9, the communication pipe 901, the communication pipe partition 902, the communication pipe closure plate 10, the output pipe 11, the gas-liquid separator 12, the pressure reducing valve 13, the air compensating valve 14, the separation liquid outlet chamber 15, the delivery pipe 16, the low-pressure exhaust pipe 1601, the exhaust pipe partition plate 17, the butt joint pipe 1701, the butt joint pipe closure plate 18, the reversing valve body 1801, the first liquid inlet 1802, the second liquid inlet 1803, the first liquid outlet 1804, the second liquid outlet 19, the air outlet end cover 20, the air inlet end cover 21, the reversing valve 2101, the communication passage 2102, the first input passage 2103, the second input passage 2104, the first output passage 2105 second output channel 2106, output chamber 2107, input chamber 22, worm wheel 23, worm 24, capturing net 25, make-up valve body 2501, make-up air inlet 2502, make-up air outlet 2503, make-up air inlet 26, lever 27, make-up valve core 2701, communication hole 2702, make-up air tank 28, hold-down spring 29, make-up valve cover 30, seal shaft 3001, intake tank 3002, air outlet channel 3003, make-up air hole 31, filter 32, evacuation tube 33, make-up tube 34, transfer pump 35, buffer tank 36, heat exchanger 37, shut-off valve 38, buffer tank 3801, buffer tank input 3802, buffer tank output 3803, buffer tank balance port 39, liquid baffle 40, buffer tank partition 41, current stabilizer 42, flexible membrane 43, buffer liquid outlet chamber 44, buffer tank liquid inlet 45, separation tank 4501, A separation liquid outlet 4502, a separation gas outlet 4503, a separation input port 46, a separation tank partition 47, a separation tank baffle 48, and a separation plate.

Detailed Description

The present invention will be further described with reference to specific embodiments, however, it will be appreciated by those skilled in the art that the detailed description herein with reference to the accompanying drawings is for better illustration, and that the invention is not necessarily limited to such embodiments, but rather is intended to cover various equivalent alternatives or modifications, as may be readily apparent to those skilled in the art.

Fig. 1 to 11 are diagrams illustrating preferred embodiments of the present invention, and the present invention is further described below with reference to fig. 1 to 11.

The high negative pressure water-saving coal mine gas extraction system comprises a primary water ring vacuum pump 1, a secondary water ring vacuum pump 2, a gas-liquid separator 11, a gas supplementing device and a working fluid circulating device, wherein the output port of the primary water ring vacuum pump 1 is communicated with the input port of the secondary water ring vacuum pump 2, the output port of the secondary water ring vacuum pump 2 is communicated with the input port of the gas-liquid separator 11, the gas outlet of the gas-liquid separator 11 is communicated with the input port of the gas supplementing device, the gas supplementing port 2503 of the gas supplementing device is communicated with the input port of the primary water ring vacuum pump 1, the input port of the working fluid circulating device is communicated with the liquid outlet of the gas-liquid separator 11, the output port of the working fluid circulating device is communicated with the liquid inlets of the primary water ring vacuum pump 1 and the secondary water ring vacuum pump 2, and the main shaft of the secondary water ring vacuum pump 2 is coaxially connected with the main shaft of the primary water ring vacuum pump 1. This high negative pressure water conservation colliery gas drainage system carries out secondary compression through the secondary water ring vacuum pump 2 to the gas behind the gas compression through first order water ring vacuum pump 1, and in the gas-liquid separator 11 was sent into to the gas after the secondary compression, in working solution circulating device can be sent back the working solution that gas-liquid separator 11 separated to first order water ring vacuum pump 1 and secondary water ring vacuum pump 2, and air supplementing device can be with the high-pressure gas of output to the air supplement in first order water ring vacuum pump 1 to avoid the air input in the first order water ring vacuum pump 1 not enough and influence the problem of work, guarantee that this high negative pressure water conservation colliery gas drainage system uses more smoothly.

Specific: as shown in fig. 1: the high negative pressure water-saving coal mine gas extraction system further comprises a conveying pipe 15 and a pressure reducing valve 12, in the embodiment, the air supplementing device is an air supplementing valve 13, an output port of the primary water ring vacuum pump 1 is communicated with an input port of the secondary water ring vacuum pump 2, and an output port of the secondary water ring vacuum pump 2 is communicated with an input port of the gas-liquid separator 11.

A distributor is arranged among the secondary water ring vacuum pump 2, the primary water ring vacuum pump 1 and the gas-liquid separator 11, a low-pressure air inlet pipe of the distributor is communicated with an output port of the primary water ring vacuum pump 1, a high-pressure air inlet pipe 801 of the distributor is communicated with an output port of the secondary water ring vacuum pump 2, and an output port of the distributor is communicated with an input port of the gas-liquid separator 11. When the required negative pressure value meets the specified requirement, the medium sent out by the primary water ring vacuum pump 1 directly enters the gas-liquid separator 11 through the distributor, and when the required negative pressure value cannot meet the requirement, the medium sent out by the primary water ring vacuum pump 1 enters the secondary water ring vacuum pump 2 through the distributor and then enters the gas-liquid separator 11 through the secondary water ring vacuum pump 2 and the distributor.

The gas outlet of the gas-liquid separator 11 is communicated with the input port of the gas compensating valve 13, and the gas compensating port 2503 of the gas compensating valve 13 is connected in series with the pressure reducing valve 12 and then is communicated with the input port of the primary water ring vacuum pump 1, and because the gas can be compensated through the gas compensating port 2503 after the input port of the primary water ring vacuum pump 1 reaches a certain negative pressure, the compensated gas can not enter a gas input pipeline and only enters the primary water ring vacuum pump 1.

As shown in fig. 2: the input end of the working fluid circulating device is communicated with the liquid outlet of the gas-liquid separator 11, and the output end is communicated with the liquid inlet of the primary water ring vacuum pump 1 and the liquid inlet of the secondary water ring vacuum pump 2.

The working fluid circulation device comprises a buffer tank 35, a delivery pump 34, a reversing device 4 and a heat exchanger 36, in this embodiment, the working fluid is water, and the working fluid can also adopt a drag reducer disclosed in the patent application document with the application number CN 201710554527.2. The input port of the delivery pump 34 is communicated with the liquid outlet of the gas-liquid separator 11, the output port of the delivery pump 34 is communicated with the input pipe 5 of the reversing device 4, the first liquid inlet 1801 of the reversing device 4 is connected with the liquid supplementing pipe 33, the second liquid inlet 1802 of the reversing device 4 is communicated with the tube side outlet of the heat exchanger 36, the first liquid outlet 1803 of the reversing device 4 is communicated with the tube side inlet of the heat exchanger 36, the second liquid outlet 1804 of the reversing device 4 is connected with the emptying pipe 32, the liquid inlet of the buffer tank 35 is communicated with the output pipe 10 of the reversing device 4, and the output port of the buffer tank 35 is connected with the liquid inlet of the primary water ring vacuum pump 1 and the liquid inlet of the secondary water ring vacuum pump 2 after being connected with the stop valve 37 in series.

When the input pipe 5 is communicated with the first liquid outlet 1803, the output pipe 10 is communicated with the second liquid inlet 1802; when the input pipe 5 is communicated with the second liquid outlet 1804, the first liquid inlet 1801 is communicated with the first liquid outlet 1803, and the output pipe 10 is communicated with the second liquid inlet 1802.

The shell side of the heat exchanger 36 is provided with flowing cooling water, so that the working fluid is cooled, and the working temperatures of the primary water ring vacuum pump 1 and the secondary water ring vacuum pump 2 are prevented from rising. A filter 31 is provided between the liquid outlet of the gas-liquid separator 11 and the delivery pump 34 to filter the working liquid.

As shown in fig. 3: the distributor includes distributor main part 6, be provided with mutually independent inlet chamber 7 and exhaust chamber 8 in the distributor main part 6, the left side of distributor main part 6 is provided with low pressure air inlet pipe, low pressure air inlet pipe and the delivery outlet intercommunication of one-level water ring vacuum pump 1, low pressure air inlet pipe and inlet chamber 7 intercommunication, the lower part of distributor main part 6 is provided with high pressure air inlet pipe 801, high pressure air inlet pipe 801 and exhaust chamber 8 intercommunication, high pressure air inlet pipe 801 and the delivery outlet intercommunication of second grade water ring vacuum pump 2, and be provided with the check valve between the delivery outlet of high pressure air inlet pipe 801 and second grade water ring vacuum pump 2. The upper portion of the distributor main body 6 is provided with a low-pressure exhaust pipe 16, the middle part of the low-pressure exhaust pipe 16 is provided with an exhaust pipe partition 1601, the exhaust pipe partition 1601 is arranged along the axial direction of the low-pressure exhaust pipe 16 and partitions the low-pressure exhaust pipe 16 into an upper exhaust passage and a lower intake passage, the exhaust passage is communicated with the intake chamber 7, and the intake passage is communicated with the exhaust chamber 8. The distributor main body 6 is also provided with a high-pressure exhaust pipe communicated with the exhaust cavity 8, and the high-pressure exhaust pipe is communicated with an input port of the gas-liquid separator 11.

A communicating pipe 9 or a butt joint pipe 17 is arranged between the low-pressure exhaust pipe 16 of the distributor and the input port of the secondary water ring vacuum pump 2, when the low-pressure exhaust pipe 16 is communicated with the input port of the secondary water ring vacuum pump 2 through the communicating pipe 9, the medium in the primary water ring vacuum pump 1 enters the secondary water ring vacuum pump 2 through the distributor at the moment, is compressed by the secondary water ring vacuum pump 2 and then is sent out through the distributor; when the low-pressure exhaust pipe 16 is communicated with the input port of the secondary water ring vacuum pump 2 through the butt joint pipe 17, the medium sent out by the primary water ring vacuum pump 1 directly enters the gas-liquid separator 11 through the distributor.

As shown in fig. 4: flanges are arranged at both ends of the butt joint pipe 17 to facilitate the butt joint with the distributor and the secondary water ring vacuum pump 2, and the right end of the butt joint pipe 17 is closed by a butt joint pipe plugging plate 1701.

When the left end of the butt joint pipe 17 is communicated with the low-pressure exhaust pipe 16 of the distributor and the right end is connected with the input port of the secondary water ring vacuum pump 2, the air inlet channel and the air outlet channel of the low-pressure exhaust pipe 16 are communicated, and the medium sent out by the primary water ring vacuum pump 1 directly enters the air inlet channel through the air outlet channel, so that the medium cannot enter the secondary water ring vacuum pump 2.

As shown in fig. 5: the both ends of communicating pipe 9 all are provided with the ring flange, and the middle part of communicating pipe 9 is provided with communicating pipe baffle 901, and communicating pipe baffle 901 baffle sets up along the axial of communicating pipe 9 to separate communicating pipe 901 into the intercommunication passageway of upside and the shutoff passageway of downside, the right-hand member of communicating pipe 9 is provided with communicating pipe closure plate 902, and communicating pipe closure plate 902 seals the right-hand member of shutoff passageway.

When the left end of the communicating pipe 9 is connected with the low-pressure exhaust pipe 16 and the right end is communicated with the input port of the secondary water ring vacuum pump 2, at this time, the exhaust channel of the low-pressure exhaust pipe 16 is communicated with the communication channel of the communicating pipe 9, the air inlet channel of the low-pressure exhaust pipe 16 is communicated with the plugging channel of the communicating pipe 9, at this time, the distributor sends the medium sent out by the primary water ring vacuum pump 1 into the secondary water ring vacuum pump 2 again, and the medium sent out by the secondary water ring vacuum pump 2 enters the gas-liquid separator 11 through the high-pressure exhaust pipe.

As shown in fig. 6 to 7: the reversing device comprises a reversing valve body 18 and a reversing valve core 21, wherein the reversing valve body 18 is a cylinder body with two open ends, an air outlet end cover 19 is detachably connected to the upper end of the reversing valve body 18, an output pipe 10 is communicated with the inner cavity of the reversing valve body 18 through the air outlet end cover 19, an air inlet end cover 20 is arranged at the lower end of the reversing valve body 18, and an input pipe 5 is communicated with the inner cavity of the reversing valve body 18 through the air inlet end cover 20. The reversing valve core 21 is rotatably arranged in the reversing valve body 18, the reversing valve core 21 and the reversing valve body 18 are coaxially arranged, and the reversing valve core 21 and the reversing valve body 18 are arranged in a sealing way. The first liquid inlet 1801 and the second liquid inlet 1802 are both arranged at the upper part of the reversing valve body 18, the first liquid inlet 1801 and the second liquid inlet 1802 are symmetrically arranged at two sides of the reversing valve body 18, and the first liquid inlet 1801 and the second liquid inlet 1802 are opposite to each other; the first liquid outlet 1803 and the second liquid outlet 1804 are both arranged at the lower part of the reversing valve body 18, the first liquid outlet 1803 and the second liquid inlet 1802 are arranged at the same side of the reversing valve body 18, the second liquid outlet 1804 and the first liquid inlet 1801 are arranged at the same side of the reversing valve body 18, and the first liquid outlet 1803 and the second liquid outlet 1804 are opposite.

The reversing valve 21 is provided with a first passage and a second passage, which are provided at intervals in the circumferential direction of the reversing valve 21. An output cavity 2106 is arranged at the upper end of the reversing valve core 21, an input cavity 2107 is arranged at the lower end of the reversing valve core 21, and the output cavity 2106 and the input cavity 2107 are blind holes coaxial with the reversing valve core 21. The output chamber 2106 communicates with the output tube 10 and the input chamber 2107 communicates with the input tube 5.

The middle part outside coaxial sleeve of switching-over case 21 is equipped with worm wheel 22, and rotatable install worm 23 on the switching-over valve body 18, worm 23 and worm wheel 22 meshing, and the end connection of worm 23 has the hand wheel, can drive worm 23 rotation through the hand wheel, and then drives the switching-over case 21 rotation through worm wheel 22, and then has realized the switching of two kinds of states of working fluid circulation.

The first channel includes a first input channel 2102 and a first output channel 2104, the first input channel 2102 and the second input channel 2104 are arranged on the same axial section of the reversing valve core 21, the inner end of the first input channel 2102 is communicated with the output cavity 2106, the outer end of the first input channel 2102 is located at the side part of the reversing valve core 21, and the outer end of the first input channel 2102 can be communicated with the second liquid inlet 1802. The inner end of the first output channel 2104 communicates with the input chamber 2107, the outer end of the first output channel 2104 is arranged on the side of the reversing valve core 21, and the outer end of the first output channel 2104 can communicate with the first liquid outlet 1803. When the reversing valve 21 rotates to the position, the first input channel 2102 communicates the second liquid inlet 1802 with the output cavity 2106, and the first output channel 2104 communicates the input cavity 2107 with the first liquid outlet 1803, so that the working liquid conveyed by the conveying pump 34 enters the buffer tank 35 after passing through the tube side of the heat exchanger 36.

The second passage includes a communication passage 2101, a second input passage 2103, and a second output passage 2105, and the communication passage 2101, the second input passage 2103, and the second output passage 2105 are all located on the same axial cross section of the reversing valve spool 21, and the axial cross section is perpendicular to the axial cross sections of the first input passage 2102 and the first output passage 2104. The inner end of the second input channel 2103 communicates with the output chamber 2106, the outer end is located on the side of the reversing valve cartridge 21, and the second input channel 2103 can communicate with the second inlet 1802. The inner end of the second output channel 2105 communicates with the input chamber 2107 and the outer end is disposed on the side of the reversing valve 21 and can communicate with the second outlet 1804. The two ends of the communication channel 2101 are respectively arranged at two opposite sides of the reversing valve core 21, one end of the communication channel 2101 is opposite to the second input channel 2103 and is arranged at two opposite sides of the reversing valve core 21 with the second input channel 2103, and can be communicated with the first liquid inlet 1801, the other end of the communication channel 2101 is opposite to the second output channel 2105 and is arranged at two opposite sides of the reversing valve core 21 with the second output channel 2105, and when the communication channel 2101 is communicated with the first liquid outlet 1803, the second output channel 2105 is communicated with the second liquid outlet 1804. When the second output channel 2105 is communicated with the second liquid outlet 1804, the second liquid inlet 1802 is communicated with the second input channel 2103, and the first liquid inlet 1801 and the first liquid outlet 1803 are simultaneously communicated with the communication channel 2102, so that the replacement of working liquid is realized.

In this embodiment, the rotation range of the reversing valve core 21 is 90 °, that is, the two stroke dead centers of the rotation of the reversing valve core 21 can respectively realize the switching of the working fluid circulation and the working fluid replacement state, so that the switching operation is more convenient and accurate.

As shown in fig. 8: the air compensating valve 13 comprises an air compensating valve body, a compression spring 28 and a sealing shaft 30, wherein the air compensating valve body comprises an air compensating valve body 25 and an air compensating valve core 27.

The bottom of the air supply valve body 25 is provided with an air supply inlet 2501, the left end of the air supply valve body 25 is provided with an air supply opening 2503, and the right end is provided with an air supply outlet 2502. The air supplementing valve 27 is disc-shaped, and the air supplementing valve 27 is rotatably arranged in the air supplementing valve body 25. The pivot vertical setting of air make-up valve core 27, air make-up valve gap 29 is installed to air make-up valve gap 25's top detachable, air make-up valve gap 29 compresses tightly air make-up valve core 27 in air make-up valve body 25, seal arrangement between air make-up valve core 27 and the air make-up valve body 25 inner wall, air make-up valve core 27 is connected with and drives its pivoted control lever 26, be located the outside of air make-up valve body 25 after the control lever 26 upper end passes air make-up valve gap 29, can drive air make-up valve core 27 and rotate around vertical pivot through control lever 26, and then make between air make-up air inlet 2501 and air make-up inlet 2503 and air make-up air outlet 2501 and air make-up air outlet 2502 cut off, realize the function of stop valve. In this embodiment, the angle of rotation of the reversing spool 27 is 90 ° so that both the shut-off and the working positions can be achieved.

Radial mounting holes are formed in the air supplementing valve core 27, two ends of each mounting hole are respectively located on two opposite sides of the reversing valve core 27, when the right end of each mounting hole is communicated with the air supplementing air outlet 2502, the left end of each mounting hole is communicated with the air supplementing air outlet 2503, a communication hole 2701 is formed in the bottom of the reversing valve core 27, the lower end of each communication hole 2701 is communicated with the air supplementing air inlet 2501, and the upper end of each communication hole 2701 is communicated with an inner cavity of the mounting hole.

The sealing shaft 30 is slidably installed in the installation hole, the length of the sealing shaft 30 is smaller than the diameter of the reversing valve core 27, namely, the length of the sealing shaft 30 is smaller than the length of the installation hole, the compression spring 28 is arranged in the installation hole, the compression spring 28 is located on the left side of the sealing shaft 30, the compression spring 28 is in a compressed state, the left end of the compression spring 28 is supported on the reversing valve body 25, the right end of the compression spring 28 is supported on the sealing shaft 30, the right end face of the sealing shaft 30 is pushed to compress the inner wall of the reversing valve body 25, sealing is arranged between the sealing shaft 30 and the inner wall of the installation hole, and a ventilation cavity is formed between the installation shaft 30 and the ventilation port 2503.

An air outlet channel 3002 is arranged at the right end of the sealing shaft 30, the air outlet channel 3002 is a blind hole coaxial with the sealing shaft 30, and the right end of the air outlet channel 3002 is arranged on the right end surface of the sealing shaft 30 and can be communicated with the air supplementing air outlet 2502. An air intake groove 3001 is provided on the lower side of the seal shaft 30, and the bottom of the air intake groove 3001 communicates with the upper end of the communication hole 2701, and the top of the air intake groove 3001 communicates with the air outlet passage 3002, so that when the air supply valve 13 is in the initial state, the gas taken in by the air supply inlet 2501 can be discharged from the air supply outlet 2502.

An air supplementing groove 2702 is arranged on the left side of the top of the reversing valve core 27, the left end of the air supplementing groove 2702 is communicated with an air supplementing cavity, the right end of the air supplementing groove 2702 is positioned on the upper side of the sealing shaft 30, air supplementing holes 3003 are arranged on the upper portion of the sealing shaft 30, the air supplementing holes 3003 are arranged on the right side of the air supplementing groove 2702 at intervals, the lower end of each air supplementing hole 3003 is communicated with the air outlet channel 3002, and the upper end of each air supplementing hole 3003 is arranged on the upper end face of the sealing shaft 30. When the air compensating port 2503 generates negative pressure, the pressure difference at two sides of the sealing shaft 30 increases, the sealing shaft 30 moves leftwards under the pressure effect, and at this time, the air compensating port 3003 is communicated with the air compensating groove 2702, so that part of the air in the air outlet channel 3002 enters the air compensating cavity and is conveyed into the primary water ring vacuum pump 1 to realize air compensation, and the air inlet groove 3001 can ensure that the communication hole 2701 is communicated with the air outlet channel 3002 at any time. When the air supply is completed, the compression spring 28 pushes the sealing shaft 30 to move rightward, the air supply hole 3003 is separated from the air supply groove 2702, and the air outlet channel 3002 is separated from the air supply cavity, so that the gas in the air outlet channel 3002 is prevented from entering the air supply cavity.

As shown in fig. 9: the buffer tank 35 comprises a buffer tank body 38 and a flexible membrane 42 arranged in the buffer tank body 38, the buffer tank body 38 is vertically arranged, the flexible membrane 42 is arranged in the middle of the buffer tank body 38, the flexible membrane 42 is in sealing connection with the inner cavity of the buffer tank body 38, the inner cavity of the buffer tank body 38 is divided into an upper balance cavity and a lower buffer cavity, and a buffer tank balance port 3803 communicated with the balance cavity is arranged at the top of the buffer tank body 38. The lower portion of the buffer tank body 38 is provided with a buffer tank input port 3801 and a buffer tank output port 3802, and the buffer tank input port 3801 and the buffer tank output port 3802 are respectively provided at opposite sides of the buffer tank body 38 and are simultaneously communicated with the buffer chamber. Working fluid enters the buffer cavity from the buffer tank input port 3801 and is output from the buffer tank output port 3802, and the buffer tank balance port 3803 and the flexible membrane 42 can maintain atmospheric pressure in the buffer cavity, so that the primary water ring vacuum pump 1 and the secondary water ring vacuum pump 2 can freely suck the working fluid, and pressure in the balance cavity is avoided.

The buffer tank body 38 is internally provided with a vertical buffer tank baffle 40, the buffer tank baffle 40 is vertically arranged, the buffer tank baffle 40 is arranged at the bottom of the buffer cavity, the lower part of the balance cavity is divided into a buffer tank liquid inlet cavity 44 on the left side and a buffer liquid outlet cavity 43 on the right side, and the buffer tank output port 3802 is lower than the buffer tank baffle 40, so that working liquid in the buffer tank liquid outlet cavity 43 flows out from the buffer tank output port 3802.

Buffer tank input port 3801 is higher than buffer tank baffle 40 and sets up, be provided with vertical fender liquid board 39 in the buffer tank body 38, fender liquid board 39 sets up with buffer tank body 38 inner wall interval, the upper end of fender liquid board 39 buckles to the left, and with buffer tank body 38 inner wall fixed connection, interval intercommunication between buffer tank input port 3801 and fender liquid board 39 and the buffer tank body 38, the lower extreme of fender liquid board 39 stretches to the bottom of buffer tank body 38, and with buffer tank body 38's bottom interval setting, make the bottom of fender liquid board 39 stretch to below the liquid level, the lower part of fender liquid board 39 is located buffer tank feed liquor intracavity 44, and with buffer tank baffle 40 interval setting. Working fluid entering through the buffer tank input port 3801 enters into the buffer tank liquid inlet cavity 44, and then overflows into the buffer tank liquid outlet cavity 43 through the top of the buffer tank partition plate 40, so that precipitation impurities can be prevented from entering into the primary water ring vacuum pump 1. The baffle 39 can ensure that water delivered from the buffer tank input port 3801 enters the buffer tank inlet chamber 44.

The buffer tank body 38 is internally provided with a flow stabilizing plate 41, the flow stabilizing plate 41 is arranged between the liquid baffle 39 and the buffer tank partition plate 40, a plurality of flow stabilizing plates 41 are arranged from bottom to top at intervals, one side of one flow stabilizing plate 41 is connected with the buffer tank partition plate 40, the other side of the flow stabilizing plate 41 is arranged at intervals with the liquid baffle 39, one side of the other flow stabilizing plate 41 is fixedly connected with the liquid baffle 39, the other side of the flow stabilizing plate 41 is arranged at intervals with the buffer tank partition plate 40, and a rotary overflow channel is formed between the liquid baffle 39 and the buffer tank partition plate 40, so that the flow stabilizing effect is realized, and the precipitated impurities are prevented from entering the buffer tank liquid outlet cavity 43 on the right side.

Each flow stabilizing plate 41 is gradually inclined downwards along the direction close to the middle part of the overflow channel, so that the precipitated impurities are further blocked, and the precipitated impurities are prevented from entering the liquid outlet cavity 43 of the buffer tank along with liquid sulfur.

As shown in fig. 10 to 11: the gas-liquid separator 11 includes a separation tank 45, a separation tank baffle 47 and a separation tank partition 46, the separation tank 45 is horizontally arranged, the separation tank partition 46 is vertically arranged in the middle of the separation tank 45, the bottom of the separation tank partition 46 is in sealing connection with the bottom of the separation tank 45, the top of the separation tank partition 46 is positioned in the middle of the separation tank 45 and separates the separation tank 45 into a left separation liquid inlet cavity 3 and a right separation liquid outlet cavity 14, a separation inlet 4503 communicated with the top of the separation liquid inlet cavity 3 is arranged on the left side of the top of the separation tank 45, a separation air outlet 4502 communicated with the separation liquid outlet cavity 14 is arranged on the right side of the top of the separation tank 45, and a separation liquid outlet 4501 communicated with the separation liquid outlet cavity 14 is arranged on the right side of the bottom of the separation tank 45. The separation tank baffle 47 is arranged at the left side of the separation tank baffle 46 at intervals, the top of the separation tank baffle 47 is in sealing connection with the top of the separation tank body 45, the bottom of the separation tank baffle 47 is lower than the top of the separation tank baffle 46 and is arranged at intervals with the bottom of the separation tank body 45, and the bottom of the separation tank baffle 47 extends below the liquid level to ensure that the separation liquid inlet cavity 3 is isolated from the separation liquid outlet cavity 14. An opening is provided at the top of the separator tank baffle 47 to allow the gas in the separator feed chamber 3 to enter the separator discharge chamber 14 on the right.

The collecting net 24 is further arranged in the separating tank 45, the collecting net 24 and the inner wall of the separating tank 45 are surrounded to form an exhaust cavity, the separating air outlet 4502 is communicated with the exhaust cavity, and the collecting net 24 can collect liquid water mist and further eliminate liquid in gas at the output end.

Still be provided with the separator plate 48 in the separator tank 45, the separator plate 48 is the protruding arc in middle part, the both ends of separator plate 48 respectively with the inner wall fixed connection of separator tank 45, the separator plate 48 interval sets up under separation input port 4503, when the input port sends the gas into separation feed liquor intracavity 3, spout the gas to the separator plate 48 earlier, because separator plate 48 is the arc, shunts the gas of spouting, and then guarantee that working solution and gas separation are more thorough.

When the high negative pressure water-saving coal mine gas extraction system is used, the primary water ring vacuum pump 1 and the secondary water ring vacuum pump 2 continuously work, the distributor can enable a medium sent out by the primary water ring vacuum pump 1 to directly enter the gas-liquid separator 11, the distributor can enable the medium sent out by the primary water ring vacuum pump 1 to enter the secondary water ring vacuum pump 2, and the medium sent out by the secondary water ring vacuum pump 2 enters the gas-liquid separator 11 through the distributor so as to provide negative pressure meeting requirements, and can also compress the medium to required pressure.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (9)

1. The utility model provides a high negative pressure water conservation colliery gas drainage system which characterized in that: including one-level water ring vacuum pump (1), second grade water ring vacuum pump (2), gas-liquid separator (11), air compensating device and working fluid circulating device, the delivery outlet of one-level water ring vacuum pump (1) communicates with the input port of second grade water ring vacuum pump (2), the delivery outlet of second grade water ring vacuum pump (2) communicates with the input port of gas-liquid separator (11), the gas outlet of gas-liquid separator (11) communicates with the input port of air compensating device, air compensating device's air compensating port (2503) communicates with the input port of one-level water ring vacuum pump (1), working fluid circulating device's input port communicates with the liquid outlet of gas-liquid separator (11), the delivery outlet of working fluid circulating device communicates with the inlet of one-level water ring vacuum pump (1) and second grade water ring vacuum pump (2), the main shaft of second grade water ring vacuum pump (2) and the main shaft coaxial coupling of one-level water ring vacuum pump (1).

2. The high negative pressure water saving coal mine gas extraction system of claim 1, wherein: the working fluid circulating device comprises a conveying pump (34), a reversing device (4), a heat exchanger (36) and a buffer tank (35), wherein an input port of the conveying pump (34) is communicated with a liquid outlet of the gas-liquid separator (11), an output port of the conveying pump (34) is communicated with an input pipe (5) of the reversing device (4), an output pipe (10) of the reversing device (4) is connected with the buffer tank (35) in series and then is communicated with liquid inlets of the primary water ring vacuum pump (1) and the secondary water ring vacuum pump (2), a tube side inlet of the heat exchanger (36) is communicated with a first liquid outlet (1803) of the reversing device (4), a tube side outlet of the heat exchanger (36) is communicated with a second liquid inlet (1802) of the reversing device (4), the first liquid inlet (1801) of the reversing device (4) is connected with a liquid supplementing pipe (33), and the second liquid outlet (1804) of the reversing device (4) is connected with an emptying pipe (32);

when the input pipe (5) is communicated with the first liquid outlet (1803), the output pipe (10) is communicated with the second liquid inlet (1802); when the input pipe (5) is communicated with the second liquid outlet (1804), the first liquid inlet (1801) is communicated with the first liquid outlet (1803), and the output pipe (10) is communicated with the second liquid inlet (1802).

3. The high negative pressure water saving coal mine gas extraction system of claim 2, wherein: the reversing device (4) comprises a reversing valve body (18) and a reversing valve core (21), the reversing valve core (21) is rotatably arranged in the reversing valve body (18), a first liquid inlet (1801) and a second liquid inlet (1802) are arranged on two opposite sides of the reversing valve body (18), the first liquid inlet (1801) and the second liquid inlet (1802) are opposite to each other, a first liquid outlet (1803) and a second liquid outlet (1804) are arranged on two opposite sides of the reversing valve body (18), the first liquid outlet (1803) and the second liquid outlet (1804) are opposite to each other, and a first channel and a second channel are arranged on the reversing valve core (21);

when the first channel enables the input pipe (5) to be communicated with the first liquid outlet (1803), the output pipe (10) is communicated with the second liquid inlet (1802); when the second channel enables the input pipe (5) to be communicated with the second liquid outlet (1804), the first liquid inlet (1801) is communicated with the first liquid outlet (1803), and the output pipe (10) is communicated with the second liquid inlet (1802).

4. A high negative pressure water saving coal mine gas extraction system as claimed in claim 3, wherein: the first channel comprises a first input channel (2102) and a first output channel (2104), the inner end of the first input channel (2102) is communicated with the output pipe (10), and the outer end of the first input channel is positioned at the side part of the reversing valve core (21); the inner end of the first output channel (2104) is communicated with the input pipe (5), the outer end of the first output channel is arranged on the side part of the reversing valve core (21), and the outer end of the first input channel (2102) and the outer end of the first output channel (2104) are positioned on the same side of the reversing valve core (21).

5. A high negative pressure water saving coal mine gas extraction system as claimed in claim 3, wherein: the second channel include intercommunication passageway (2101), second input channel (2103) and second output channel (2105), the one end and the output tube (10) intercommunication of second input channel (2103), the other end sets up the lateral part at switching-over case (21), and second input channel (2103) and first input channel (2102) are in circumferencial direction interval setting, the one end and input tube (5) intercommunication of second output channel (2105), the other end sets up the lateral part at switching-over case (21), and second output channel (2105) and first output channel (2104) are in circumferencial direction interval setting, the both ends of intercommunication passageway (2101) set up respectively in the both sides that switching-over case (21) are relative, and the both ends of intercommunication passageway (2101) are just set up with second output channel (2105) and second input channel (2103) respectively, and be located the both sides that switching-over case (21) are relative with second output channel (2105) and second input channel (2103) respectively.

6. A high negative pressure water saving coal mine gas extraction system as claimed in claim 3, wherein: the reversing device (4) further comprises a worm wheel (22) and a worm (23), the worm wheel (22) is coaxially sleeved outside the reversing valve core (21), the worm wheel (22) and the reversing valve core (21) keep rotating synchronously, the worm (23) is rotatably arranged on the reversing valve body (18), the worm (23) is meshed with the worm wheel (22), and a hand wheel is arranged on the worm (23).

7. The high negative pressure water saving coal mine gas extraction system of claim 1, wherein: the air supplementing device comprises an air supplementing valve main body, a sealing shaft (30) and a compression spring (28), wherein an air supplementing air inlet (2501) communicated with an air outlet of a gas-liquid separator (11) is arranged at the bottom of the air supplementing valve main body, an air supplementing air outlet (2502) and an air supplementing opening (2503) are formed in two ends of the air supplementing valve main body, the air supplementing air inlet (2501) is simultaneously communicated with the air supplementing air outlet (2502) and the air supplementing opening (2503), the sealing shaft (30) is slidably arranged in the air supplementing valve main body, an air supplementing cavity is formed between the sealing shaft (30) and the air supplementing opening (2503), an air outlet channel (3002) communicated with the air supplementing air inlet (2501) and the air supplementing air outlet (2502) is formed in the sealing shaft (30), an air supplementing groove (2702) is formed in the inner wall of the air supplementing valve main body, one end of the air supplementing groove (2702) is communicated with the air supplementing cavity, the other end of the air supplementing groove extends between the sealing shaft (30) and the inner wall of the air supplementing valve main body, the air supplementing hole (3003) is formed in one end of the sealing shaft (30) and is communicated with the air supplementing air outlet channel (2502), the other end of the air supplementing air inlet (3002) is arranged at a position close to one side of the air supplementing pump (2503) and is arranged at one side of the air supplementing air inlet (2503) and is far away from the air inlet (2503) and is communicated with the air inlet (2503) and is arranged at one side of the air inlet (main body.

8. The high negative pressure water saving coal mine gas extraction system of claim 7, wherein: an air inlet groove (3001) is formed in one side, close to the air supplementing air inlet (2501), of the sealing shaft (30), and the air supplementing air inlet (2501) is communicated with the air outlet channel (3002) through the air supplementing groove (3001).

9. The high negative pressure water saving coal mine gas extraction system of claim 7, wherein: the air compensating valve body comprises an air compensating valve body (25) and an air compensating valve core (27), the air compensating valve core (27) is rotatably arranged in the air compensating valve body (25), a mounting hole penetrating through the air compensating valve core (27) is formed in the air compensating valve core (27), a sealing shaft (30) is slidably arranged in the mounting hole, two ends of the mounting hole are respectively communicated with an air compensating port (2503) and an air compensating outlet (2502), and a communication hole (2701) for communicating an air outlet channel (3002) of the air compensating air inlet (2501) is formed in the bottom of the air compensating valve core (27).

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