CN114000914B - Coal mine gas extraction device - Google Patents
Coal mine gas extraction device Download PDFInfo
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- CN114000914B CN114000914B CN202111483603.8A CN202111483603A CN114000914B CN 114000914 B CN114000914 B CN 114000914B CN 202111483603 A CN202111483603 A CN 202111483603A CN 114000914 B CN114000914 B CN 114000914B
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- 238000000605 extraction Methods 0.000 title claims abstract description 88
- 239000003245 coal Substances 0.000 title claims abstract description 32
- 239000000428 dust Substances 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims description 23
- 238000003780 insertion Methods 0.000 claims description 15
- 230000037431 insertion Effects 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 9
- 239000012535 impurity Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
- B01D47/021—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath by bubbling the gas through a liquid bath
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
- F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention belongs to the technical field of coal mining, and particularly relates to a coal mine gas extraction device, which comprises a main extraction pipeline and a branch extraction pipeline, wherein the branch extraction pipeline is connected with the main extraction pipeline, the main extraction pipeline and the branch extraction pipeline respectively comprise pipeline section units, adjacent pipeline section units are connected, and an axial flow fan and an electromagnetic valve are arranged in the extraction pipeline; the main extraction pipeline is connected with the dust removal pipeline, the dust removal pipeline is provided with a Venturi ejector, a gas inlet of the Venturi ejector is connected with the main extraction pipeline, a gas-liquid output port is connected with a filter box, the filter box is connected with a cache box, the cache box is connected with a water inlet pipeline and a water pump, the water pump is connected with a liquid inlet of the Venturi ejector, a gas-liquid separator is connected above the filter box, and the gas-liquid separator is connected with a gas collection pipeline. According to the coal mine gas extraction device provided by the embodiment of the invention, the plurality of groups of axial flow fans are arranged, so that the suction efficiency is improved, the sucked gas can be dedusted, and the gas collection and utilization are facilitated.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a coal mine gas extraction device.
Background
At present, coal is still the main energy source of China, and ensuring the safe production of coal mines is an important guarantee for sustainable development of national economy. Because domestic 95% of coal mining is underground operation, the occurrence condition of coal beds is complex, and most of mines enter a deep mining period. The increase of the burial depth of the coal bed increases the ground stress in the coal bed, the gas content and the gas pressure are continuously increased, and the air permeability of the coal bed and surrounding rock is reduced, so that the hidden danger of coal and gas outburst of the coal bed is increased.
In the coal mining process, firstly, the gas in the coal bed is pumped out, so that the safe operation of mining is ensured, and the gas explosion accident is avoided.
The structure of current gas extraction equipment is simpler, and extraction efficiency is low, and the dust piece in addition that often accompanies gas in the extraction process, along with the progression of extraction gas, dust etc. can be attached to the accumulation on the extraction pipeline, makes the extraction internal diameter of pipeline diminish, influences the efficiency of extraction gas, and current gas extraction equipment does not set up special dust piece etc. separation structure, and the dust content of extraction gas is higher, needs to handle in addition, just can utilize gas.
Disclosure of Invention
The invention aims to provide a coal mine gas extraction device which has high extraction efficiency, and can be used for carrying out dust removal operation on gas in an extraction pipeline, so that the dust content of the gas is greatly reduced.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
The coal mine gas extraction device comprises a pipeline support and extraction pipelines, wherein the extraction pipelines are fixed on the pipeline support through pipe clamps, each extraction pipeline comprises a main extraction pipeline and a branch extraction pipeline, each branch extraction pipeline is connected with the main extraction pipeline through a first connecting pipe, each main extraction pipeline and each branch extraction pipeline respectively comprise a pipeline section unit, adjacent pipeline section units are connected through a second connecting pipe, and an axial flow fan and an electromagnetic valve are arranged in each second connecting pipe;
the main extraction pipeline is connected with a dust removal pipeline, the dust removal pipeline is provided with a Venturi ejector, the Venturi ejector is provided with a liquid inlet, a gas inlet and a gas-liquid outlet, the main extraction pipeline is connected with the gas inlet, the gas-liquid outlet is connected with a filter box through a pipeline, the filter box is connected with a cache box through a pipeline, the cache box is connected with a water inlet pipeline and a water pump through a pipeline, the water pump is connected with the liquid inlet through a pipeline, a gas-liquid separator is connected above the filter box, and the gas-liquid separator is connected with a gas collection pipeline;
the filter box is provided with a conical bottom, the conical bottom is provided with a slag discharging port, and a filter screen is arranged in the filter box.
As an improvement, the first connecting pipe comprises an upper connecting pipe body, a lower connecting pipe body and an expansion pipe body, wherein the upper end of the upper connecting pipe body and the lower end of the lower connecting pipe body are provided with flanges, the expansion pipe body comprises a lower cone-shaped pipe body and an upper cone-shaped pipe body, an intermediate connecting pipe body is connected between the upper cone-shaped pipe body and the lower cone-shaped pipe body, the upper connecting pipe body is connected with the upper cone-shaped pipe body and extends into the upper cone-shaped pipe body, and the lower connecting pipe body is connected with the lower cone-shaped pipe body and penetrates through the lower cone-shaped pipe body to extend into the intermediate connecting pipe body;
The pipe wall of the middle connecting pipe body is provided with a branch pipe connecting pipe, the pipe wall of one side of the branch pipe connecting pipe is tangent with the pipe wall of the middle connecting pipe body, and the branch pipe connecting pipe is connected with the branch extraction pipeline.
As a further improvement, a plurality of through holes are formed in the part, extending into the upper conical tube body, of the upper connecting tube body, a baffle is arranged on the inner wall of the upper connecting tube body, the position of the baffle corresponds to that of the through holes, and an air outlet gap is reserved between the baffle and the through holes;
The lower connecting pipe body stretches into one end of the middle connecting pipe body exceeds the connecting position of the branch pipe connecting pipe and the wall of the expansion pipe body, the lower conical pipe body is provided with a slag discharging port, and one end of the upper connecting pipe body stretching into the middle connecting pipe body is provided with a horn mouth structure.
As a further improvement, the axial flow fan comprises an impeller, the impeller is connected with a fan motor, a blade mounting hole is formed in the peripheral surface of the impeller, a mounting seat is fixedly arranged in the blade mounting hole, blades are rotatably mounted in the mounting seat through bearings, the blades are fixedly connected with a worm wheel, the worm wheel is connected with a worm, and the worm is connected with a first gear;
the impeller is internally provided with a rotation adjusting cavity, a second gear is arranged in the rotation adjusting cavity in a rotating mode, the second gear is meshed with the first gear, the second gear is connected with a second motor, and an output shaft of the second motor is connected with the second gear.
As a further improvement, a rotary mounting frame is fixedly arranged in the rotary adjusting cavity, the worm is rotatably mounted on the rotary mounting frame, an inner gear ring is further arranged in the rotary adjusting cavity, the inner gear ring is meshed with the first gear, and a limiting groove is formed in the rotary mounting frame.
As a further improvement, fixed pipes are respectively arranged at two sides of the rotary mounting frame, the impeller is provided with an impeller shaft, the impeller shaft is in transmission connection with an output shaft of the fan motor, the impeller shaft extends into the fixed pipe at one side of the rotary mounting frame, and the impeller shaft is in rotary fit with the fixed pipe;
the second gear is provided with a second gear shaft, the second gear shaft is in transmission connection with an output shaft of the second motor, the second gear shaft stretches into a fixed pipe at the other side of the rotary mounting frame, and the second gear shaft is in rotary fit with the fixed pipe.
As a further improvement, be equipped with the fan mounting bracket in the second connecting pipe, the windward side of fan mounting bracket is installed the impeller, the air-out side of fan mounting bracket is installed the fan motor, the windward one end installation of impeller the second motor, fan motor and second motor all are equipped with airtight cover, lie in the second connecting pipe the impeller both sides are equipped with preceding stator and back stator, lie in the installation the front stator the place ahead is equipped with the rectification structure, lie in the rear of back stator is equipped with the diffusion structure.
As a further improvement, the venturi ejector comprises a nozzle, an air suction chamber, a mixing section and a diffusion section, wherein the nozzle is connected with a nozzle mounting pipe, the nozzle mounting pipe comprises an insertion part and a mounting part, the insertion part extends into the dust removing pipeline and is in sealing fit with the dust removing pipeline, a flange plate is fixedly arranged on the mounting part, a flange plate is fixedly arranged on the dust removing pipeline, and a first locking bolt and a tight supporting bolt are arranged between the two flange plates;
The two flange plates are provided with through holes for the first locking bolts to pass through, the flange plate on the dust removal pipeline is provided with threaded holes in threaded fit with the abutting bolts, and the end parts of the abutting bolts are abutted with the flange plate of the mounting part;
The outer peripheral surface of the nozzle is slidably provided with a locking sleeve, one end of the locking sleeve is provided with an annular abutting part, the inner peripheral surface close to the other end of the locking sleeve is provided with threads, the outer peripheral surface of the nozzle is provided with an annular limiting protruding edge, the limiting protruding edge abuts against the abutting part, and the outer peripheral surface of the air suction chamber is provided with external threads matched with the internal threads of the locking sleeve.
As a further improvement, a sealing groove is arranged on the insertion part, a sealing ring is arranged in the sealing groove, a flange plate is sleeved on the insertion part in a sliding way, and a sealing ring is arranged between the flange plate on the insertion part and the flange plate on the dust removal pipeline and is connected with a second locking bolt;
And a sealing ring is arranged between the limiting convex edge and the abutting part.
As a further improvement, the outlet end of the nozzle and the inlet end of the mixing section are positioned on the same plane, the diameter of the outlet end of the nozzle is equal to 1/2 of the diameter of the mixing section, the length-diameter ratio of the mixing section is 7, the length of the diffusion section is more than 5 times of the length of the mixing section, and the included angle between the circumferential surface of the diffusion section and the axial direction is less than or equal to 6 degrees.
By adopting the technical scheme, the invention has the beneficial effects that:
According to the coal mine gas extraction device provided by the invention, the main extraction pipeline and the branch extraction pipeline respectively comprise the pipeline section units, the adjacent pipeline section units are connected through the second connecting pipe, the axial flow fan and the electromagnetic valve are arranged in the second connecting pipe, and the gas in the pipeline section units in the extraction pipeline can be extracted through the axial flow fan, so that the sufficient suction force in each pipeline section unit is ensured, and the extraction efficiency is improved; the main extraction pipeline is connected with a dust removal pipeline, the dust removal pipeline is provided with a venturi ejector, the venturi ejector ejects water flow to suck gas, impurities such as dust in the gas are mixed into the water flow, and the gas does not contain water, so that the dust in the gas is removed, and the gas is convenient to collect and store subsequently.
The first connecting pipe comprises an upper connecting pipe body, a lower connecting pipe body and an expanding pipe body, wherein the expanding pipe body comprises a lower conical pipe body, an upper conical pipe body and an intermediate connecting pipe body, the intermediate connecting pipe body is provided with a branch pipe connecting pipe, gas enters from the branch pipe connecting pipe along the tangential direction of the intermediate connecting pipe body, the gas rotates in the intermediate connecting pipe body, particulate impurities such as dust and the like gradually settle to the bottom of the lower conical pipe body, gas components such as gas move upwards, part of the gas components directly enter the upper connecting pipe body, the other part of the gas components enter the upper conical pipe body, the other part of the gas components enter the upper connecting pipe body, the gas components enter the upper connecting pipe body through a through hole in the pipe wall of the upper connecting pipe body, and preliminary dust separation is carried out on the gas.
The second connecting pipe comprises a second connecting pipe, and an axial flow fan and an electromagnetic valve are arranged in the second connecting pipe, so that the axial flow fan and the electromagnetic valve can be regulated according to the required suction requirement and suction condition to ensure the suction effect. Specifically, through second motor drive control second gear, second gear rotates and drives first gear and rotate, and first gear rotates and drives the worm and rotate, and the worm rotates and makes the worm wheel rotate, and the turbine rotates and drives the blade and rotate, can adjust blade angle according to specific needs to be suitable for different operating modes, guarantee suction efficiency.
The rotation adjusting chamber is fixedly provided with a rotation mounting frame, an inner gear ring is arranged on the rotation mounting frame, the first gear and the second gear are both rotatably mounted on the rotation mounting frame, the inner gear ring is meshed with the first gear, and the stability of the first gear and the second gear in transmission can be improved.
The axial flow fan drives the impeller shaft to rotate, the impeller shaft rotates to drive the impeller and the blades to rotate, one end of the impeller shaft stretches into the fixed pipe and is in rotary fit with the fixed pipe, the axis of the impeller shaft can be kept stable in rotation, the second motor drives the second gear shaft to rotate, the second gear shaft stretches into the fixed pipe at the other side of the rotary mounting frame and is in rotary fit with the fixed pipe, and the axis of the second gear shaft is kept stable in rotation.
The fan motor and the second motor are both provided with a closed cover, front guide vanes and rear guide vanes are arranged on two sides of the impeller in the second connecting pipe, and a rectifying structure and a diffusing structure are further arranged, so that the suction efficiency of the fan is improved.
The nozzle of venturi sprayer passes through nozzle installation tube and is connected with the dust removal pipeline, and nozzle installation tube includes insertion part and installation department, and nozzle installation tube's insertion part and dust removal pipeline sealing fit, through first locking bolt with nozzle installation tube and dust removal pipeline connection, can separate nozzle installation tube and dust removal pipeline through supporting tight bolt to still be provided with the sealing washer, support tightly with the ring flange on ring flange and the dust removal pipeline that the cover was established on the insertion part through the second locking bolt, and then make the sealing washer between the two support tightly with the ring flange on the dust removal pipeline, improve sealed effect.
The outlet end of the nozzle and the inlet end of the mixing section are positioned on the same plane, the diameter of the outlet end of the nozzle is equal to 1/2 of the diameter of the mixing section, the length-diameter ratio of the mixing section is 7, the length of the pressure section is more than 5 times of the length of the mixing section, the included angle between the circumferential surface of the diffusion section and the axial direction is less than or equal to 6 degrees, and the venturi ejector is ensured to have enough suction force and good suction efficiency.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the filter box;
FIG. 3 is a schematic structural view of a second connection pipe;
FIG. 4 is a schematic view of the structure of the first connecting tube;
FIG. 5 is a schematic structural view of an axial flow fan;
fig. 6 is an enlarged view of a portion a in fig. 5;
FIG. 7 is a schematic view of the structure of a venturi injector;
FIG. 8 is a schematic view of the structure of the first locking bolt, the abutment bolt and the second tightening bolt;
Wherein, 1-main extraction pipeline, 2-branch extraction pipeline, 3-first connecting pipe, 31-upper connecting pipe body, 311-baffle, 312-horn mouth structure, 32-lower connecting pipe body, 33-expanded pipe body, 331-lower cone-shaped pipe body, 332-upper cone-shaped pipe body, 333-middle connecting pipe, 334-branch pipe connecting pipe, 4-pipe section unit, 5-second connecting pipe, 51-fan mounting rack, 6-axial fan, 61-impeller, 62-fan motor, 63-mounting seat, 64-blade, 65-worm wheel, 66-worm, 67-first gear, 68-second gear, 69-second motor, 610-rotating mounting rack, 611-ring, 612-limit groove, 613-fixed tube, 614-impeller shaft, 615-second gear shaft, 616-sealed hood, 7-dust removal pipeline, 71-venturi ejector, 711-liquid inlet, 712-gas inlet, 713-gas-liquid outlet, 714-nozzle, 715-suction chamber, 716-mixing section, 717-diffuser section, 718-insert, 719-mounting section, 720-spacing flange, 72-filter box, 721-conical bottom, 722-filter screen, 73-buffer box, 74-water inlet pipeline, 75-water pump, 76-gas-liquid separator, 77-gas collection pipeline, 8-flange, 9-first locking bolt, 10-tightening bolt, 11-locking sleeve, 111-tightening section, 12-sealing ring, 13-solenoid valve, 14-second locking bolt.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 8 together, a coal mine gas extraction device comprises a pipeline support and an extraction pipeline, wherein the pipeline support is fixed on the wall of a mine tunnel, the extraction pipeline is fixed on the pipeline support through a pipe clamp, the extraction pipeline stretches into a region where gas needs to be extracted for extraction, the extraction pipeline comprises a main extraction pipeline 1 and a branch extraction pipeline 2, the branch extraction pipeline is connected with the main extraction pipeline 1 through a first connecting pipe 3, the main extraction pipeline 1 and the branch extraction pipeline 2 respectively comprise a pipe section unit 4, adjacent pipe section units 4 are connected through a second connecting pipe 5, an axial flow fan 6 and a solenoid valve 13 are arranged in the second connecting pipe 5, specifically, a gas concentration measuring instrument and a pressure sensor are arranged at different positions in the extraction pipeline as required, the gas concentration sensor and the pressure sensor are connected with a controller, the controller analyzes and processes the collected gas concentration information and air pressure information, then sends out instructions to control the operation of the fan and the opening degree of the solenoid valve, so that sufficient suction force is ensured in each pipe section unit, the suction cooperation of the whole extraction pipeline is facilitated to be ensured, and the gas extraction efficiency is improved.
In this embodiment, the main extraction pipeline 1 is connected with the dust removal pipeline 7, the dust removal pipeline 7 is usually arranged on the ground, multiple groups of dust removal pipelines or multiple stages of dust removal pipelines can be arranged in parallel or in series as required, in order to meet the dust removal requirement, specifically, the dust removal pipeline 7 is provided with a venturi injector 71, the venturi injector 71 is provided with a liquid inlet 711, a gas inlet 712 and a gas-liquid outlet 713, the main extraction pipeline 1 is connected with the gas inlet 711, the gas-liquid outlet 713 is connected with the filter box 72 through a pipeline, the filter box 72 is connected with the buffer box 73 through a pipeline, the buffer box 73 is connected with the water inlet pipeline 74 and the water pump 75 through a pipeline, the water pump 72 is connected with the gas-liquid separator 76, the gas-liquid separator 76 is connected with the gas collection pipeline 77, in the specific working process, water is injected into the liquid inlet 711 of the venturi injector 71, gas is pumped into from the gas-liquid outlet 713, the mixture of steam and water is sprayed from the gas-liquid outlet 713, dust and other impurities in the gas are mixed into the water flow, and the dust in the gas is not contained in the gas, thereby the gas is removed, and the subsequent gas is collected and stored conveniently.
Impurities such as dust in the gas enter the water, the water mixed with the impurities is filtered in the filter box 72, then flows into the buffer box 73, flows into the venturi ejector 71 through the water pump 75 for recycling, and can be fed into the buffer box 73 through the water inlet pipeline 74 for water supplementing operation as required.
The filter box 72 is provided with the toper bottom 721, does benefit to heavy impurity precipitation such as dust in the rivers, and toper bottom 721 is equipped with the row cinder notch, can regularly carry out sediment operation, is equipped with filter screen 722 in the filter box, and the mesh size of filter screen is selected according to actual need and is used, and the setting of filter screen 722 filters the water of mixing dust impurity, avoids its direct delivery port through filter box 72 to flow.
In this embodiment, the first connecting tube 3 includes an upper connecting tube 31, a lower connecting tube 32 and an expanded tube 33, the upper end of the upper connecting tube 31 and the lower end of the lower connecting tube 32 are provided with flanges 8, the expanded tube 33 includes a lower tapered tube 331 and an upper tapered tube 332, a middle connecting tube 333 is connected between the upper tapered tube 332 and the lower tapered tube 331, the upper connecting tube 31 is connected with the upper tapered tube 332 and extends into the upper tapered tube 332, and the lower connecting tube 32 is connected with the lower tapered tube 331 and extends into the middle connecting tube 333 through the lower tapered tube 331;
the part of the upper connecting pipe body 31 extending into the upper conical pipe body 332 is provided with a plurality of through holes, the inner wall of the upper connecting pipe body is provided with a baffle 311, the position of the baffle 311 corresponds to the position of the through holes, and an air outlet gap is reserved between the baffle 311 and the through holes;
The pipe wall of the middle connecting pipe 333 is provided with a branch pipe connecting pipe 334, one side pipe wall of the branch pipe connecting pipe 334 is tangent with the pipe wall of the middle connecting pipe 333, and the branch pipe connecting pipe 334 is connected with the branch extraction pipeline 2.
In this embodiment, the end of the lower connecting pipe body 32 extending into the middle connecting pipe body 333 exceeds the connection position of the branch pipe connecting pipe 334 and the wall of the expansion pipe body 33, so that the gas flowing out of the lower connecting pipe body 32 cannot be directly impacted, and the end of the upper connecting pipe body 31 extending into the middle connecting pipe body 333 is provided with a bell mouth structure 312, which is beneficial for the gas flowing out of the lower connecting pipe body 32 to enter the upper connecting pipe body 31.
The gas in branch extraction pipeline 2 enters along the tangential direction of middle connecting pipe body 333 from branch pipe connecting pipe 334, the gas is in rotary motion in middle connecting pipe body 333, granule impurity such as dust therein subsides gradually to lower conical pipe body 331 bottom, gas composition such as gas upwards moves, part directly enters into upper connecting pipe body 31, still part enters into in the upper conical pipe body 332, enter into in upper connecting pipe body 31 through the through-hole on the pipe wall of upper connecting pipe body 31, carry out preliminary dust separation to the gas, in-service use, set up the row cinder notch in the bottom of lower conical pipe body 331, can regularly carry out the sediment operation.
In this embodiment, the axial flow fan 6 includes an impeller 61, the impeller 61 is connected with a fan motor 62, a blade mounting hole is formed in the peripheral surface of the impeller 61, a mounting seat 63 is fixedly arranged in the blade mounting hole, a blade 64 is rotatably mounted in the mounting seat 63 through a bearing, the blade 64 is fixedly connected with a worm wheel 65, the worm wheel 65 is connected with a worm 66, and the worm 66 is connected with a first gear 67.
The impeller 61 is internally provided with a rotation adjusting cavity, a second gear 68 is arranged in the rotation adjusting cavity in a meshed mode, the second gear 68 is meshed with the first gear 67, the second gear 68 is connected with a second motor 69, an output shaft of the second motor 69 is connected with the second gear 68, the second gear 68 is driven and controlled through the second motor 69, the second gear 68 rotates to drive the first gear 67 to rotate, the first gear 67 rotates to drive the worm 66 to rotate, the worm 66 rotates to enable the worm wheel 65 to rotate, the turbine 65 rotates to drive the blade 64 to rotate, and the angle of the blade 64 can be adjusted according to specific requirements, so that different working conditions are applicable, and the suction efficiency is guaranteed.
In this embodiment, a rotation mounting frame 610 is fixedly arranged in the rotation adjusting chamber, the worm 66 is rotatably mounted on the rotation mounting frame 610, an inner gear ring 611 is further arranged in the rotation adjusting chamber, the inner gear ring 611 is meshed with the first gear 67, a limiting groove 612 is formed in the rotation mounting frame 610, and when the second gear 68 drives the first gear 67 to rotate, the first gear 67 drives the inner gear ring 611 to rotate along the limiting groove 612, and the arrangement of the inner gear ring 611 increases the rotation stability of the first gear 67 and the second gear 68.
In this embodiment, the two sides of the rotary mounting frame 610 are respectively provided with a fixed tube 613, the impeller 61 is provided with an impeller shaft 614, the impeller shaft 614 is in transmission connection with the output shaft of the fan motor 62, and the impeller shaft 614 extends into the fixed tube 613 at one side of the rotary mounting frame 610 and is in rotary fit with the fixed tube 613, so that the axis of the impeller shaft 614 can be kept stable during rotation;
The second gear 68 is provided with a second gear shaft 615, the second gear shaft 615 is connected with the output shaft of the second motor 69 in a transmission manner, and the second gear shaft 615 extends into the fixed tube 613 at the other side of the rotary mounting frame 610 and is in rotary fit with the fixed tube 613, so that the axis is kept stable when the second gear shaft 615 rotates.
In this embodiment, the second connecting pipe 5 is internally provided with the fan mounting frame 51, the windward side of the fan mounting frame 51 is provided with the impeller 61, the windward side of the fan mounting frame 51 is provided with the fan motor 62, the windward end of the impeller 61 is provided with the second motor 69, both the fan motor 62 and the second motor 69 are provided with the sealed cover 616, the sealed cover 616 of the second motor can be arranged to be hemispherical or semi-ellipsoidal, the sealed cover 616 of the fan motor can be arranged to be streamline structure, the second connecting pipe 5 is internally provided with the front guide vane and the rear guide vane at two sides of the impeller 61, the mounting body is internally provided with the rectifying structure at the front guide vane, the rear guide vane, the rectifying structure and the diffusing structure are all conventional technologies existing in the field, the conventional technologies existing in the field can be adopted for the power supply of the fan motor and the second motor, the power supply structure such as the hemispherical or semi-ellipsoidal can be adopted, and the power supply structure such as the sliding ring can be adopted, and the specific limitation is not made herein.
In this embodiment, the venturi injector 71 includes a nozzle 714, an air suction chamber 715, a mixing section 716 and a diffuser section 717, the nozzle 714 is connected with a nozzle mounting pipe, the nozzle mounting pipe includes an insertion portion 718 and a mounting portion 719, the insertion portion 718 extends into the dust removal pipeline 7 and is in sealing fit with the dust removal pipeline 7, a flange 8 is disposed on the mounting portion 719, the dust removal pipeline 7 is provided with flanges 8, and a first locking bolt 9 and a tightening bolt 10 are disposed between the two flanges 8;
the two flange plates 8 are provided with through holes for the first locking bolts 9 to pass through, the flange plates 8 on the dust removal pipeline 7 are provided with threaded holes in threaded fit with the abutting bolts 10, and the end parts of the abutting bolts 10 are abutted against the flange plates 8 of the mounting part 719;
The outer peripheral surface of the nozzle 714 is slidably provided with a locking sleeve 11, one end of the locking sleeve 11 is provided with an annular abutting part 111, the inner peripheral surface close to the other end is provided with threads, the outer peripheral surface of the nozzle 714 is provided with an annular limiting convex edge 720, the limiting convex edge 720 abuts against the abutting part 111, and the outer peripheral surface of the air suction chamber 715 is provided with external threads matched with the internal threads of the locking sleeve 11.
In the specific use process, when the venturi injector 71 is installed, firstly, the position of the outlet end of the nozzle 714 is fixed, then the first locking bolt 9 and the abutting bolt 10 are screwed, the positions of the installation part 719 and the flange 8 on the dust removal pipeline 7 are fixed, and finally, the locking sleeve 11 is screwed to enable the nozzle 714 to be relatively fixed with the air suction chamber 715; when the venturi injector 71 needs to be disassembled, the locking sleeve 11 is unscrewed first to release the nozzle 714 from the suction chamber 715, then the first locking bolt 9 is unscrewed, finally the abutting bolt 10 is screwed, the flange 8 of the mounting portion 719 and the flange 8 on the dust removal pipeline 7 are separated, and finally the nozzle mounting tube is separated from the dust removal pipeline 7.
When screwing the first locking bolt 9 and the abutting bolt 10, since a plurality of first locking bolts 9 and abutting bolts 10 are usually arranged, the first locking bolts or the abutting bolts are always screwed synchronously as much as possible, so that the axial movement of the nozzle can be ensured as much as possible, and the axial deflection of the nozzle is avoided.
In this embodiment, be equipped with the seal groove on the insert 718, be equipped with sealing washer 12 in the seal groove, the slip cap is equipped with ring flange 8 on the insert, be equipped with sealing washer 12 and be connected with second locking bolt 14 between ring flange on insert and the ring flange on the dust removal pipeline, support tightly with the ring flange on the dust removal pipeline that the cover was established on the insert through second locking bolt 14, and then make the sealing washer between the two support tightly with the ring flange on the dust removal pipeline, improve sealed effect, the ring flange on the insert is equipped with the through-hole that supplies first locking bolt and supports tight bolt to pass.
A sealing ring 12 is arranged between the limiting convex edge 720 and the abutting part 111, and the locking sleeve 11 is screwed tightly, so that the limiting convex edge, the abutting part and the sealing ring are abutted tightly, and a sealing effect is achieved.
In this embodiment, the structures of the first locking bolt, the abutting bolt and the second locking bolt are specifically referred to fig. 8, and it should be noted that fig. 8 is only a schematic illustration, only a partial structure is shown, and is not a design drawing of a real object.
In this embodiment, the outlet end of the nozzle 714 and the inlet end of the mixing section 716 are located on the same plane, so that the water flow sprayed out of the nozzle is prevented from falling into the air suction chamber 715, the air suction amount is reduced by increasing the diameter of the mixing section 716, therefore, the diameter of the outlet end of the nozzle is preferably equal to 1/2 of the diameter of the mixing section 716, sufficient air suction flow and air suction efficiency are ensured, the gas flow is increased by increasing the length of the mixing section 716, but the gas-liquid two-phase mixing effect is poor, the length-diameter ratio of the mixing section is preferably 7, the air suction amount is high, the gas-liquid two-phase mixing effect is considered, the length and angle of the diffusion section 717 influence the air suction flow and the gas-liquid mixing effect, the length of the diffusion section 717 is greater than 5 times the length of the mixing section 716, the included angle between the circumferential surface of the diffusion section 717 and the axial direction is less than or equal to 6 degrees, and the air suction amount is increased. The design is obtained by carrying out a large number of experiments and analyzing data aiming at coal mine gas suction, and has very important practical significance.
According to the coal mine gas extraction device provided by the embodiment of the invention, the plurality of groups of axial flow fans are arranged, so that the suction efficiency is improved, the sucked gas can be dedusted, and the gas collection and utilization are facilitated.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (8)
1. The coal mine gas extraction device is characterized by comprising a pipeline bracket and extraction pipelines, wherein the extraction pipelines are fixed on the pipeline bracket through pipe clamps, each extraction pipeline comprises a main extraction pipeline and a branch extraction pipeline, each branch extraction pipeline is connected with the main extraction pipeline through a first connecting pipe, each main extraction pipeline and each branch extraction pipeline respectively comprise a pipeline section unit, adjacent pipeline section units are connected through a second connecting pipe, and an axial flow fan and an electromagnetic valve are arranged in each second connecting pipe;
the main extraction pipeline is connected with a dust removal pipeline, the dust removal pipeline is provided with a Venturi ejector, the Venturi ejector is provided with a liquid inlet, a gas inlet and a gas-liquid outlet, the main extraction pipeline is connected with the gas inlet, the gas-liquid outlet is connected with a filter box through a pipeline, the filter box is connected with a cache box through a pipeline, the cache box is connected with a water inlet pipeline and a water pump through a pipeline, the water pump is connected with the liquid inlet through a pipeline, a gas-liquid separator is connected above the filter box, and the gas-liquid separator is connected with a gas collection pipeline;
The filter box is provided with a conical bottom, the conical bottom is provided with a slag discharging port, and a filter screen is arranged in the filter box;
The first connecting pipe comprises an upper connecting pipe body, a lower connecting pipe body and an expansion pipe body, wherein flanges are arranged at the upper end of the upper connecting pipe body and the lower end of the lower connecting pipe body, the expansion pipe body comprises a lower conical pipe body and an upper conical pipe body, an intermediate connecting pipe body is connected between the upper conical pipe body and the lower conical pipe body, the upper connecting pipe body is connected with the upper conical pipe body and stretches into the upper conical pipe body, and the lower connecting pipe body is connected with the lower conical pipe body and stretches into the intermediate connecting pipe body after penetrating through the lower conical pipe body;
the pipe wall of the middle connecting pipe body is provided with a branch pipe connecting pipe, gas in the branch extraction pipeline enters from the branch pipe connecting pipe along the tangential direction of the middle connecting pipe body, the gas rotates in the middle connecting pipe body, and the branch pipe connecting pipe is connected with the branch extraction pipeline;
The part of the upper connecting pipe body extending into the upper conical pipe body is provided with a plurality of through holes, the inner wall of the upper connecting pipe body is provided with a baffle, the position of the baffle corresponds to the position of the through holes, and an air outlet gap is reserved between the baffle and the through holes;
The lower connecting pipe body stretches into one end of the middle connecting pipe body exceeds the connecting position of the branch pipe connecting pipe and the wall of the expansion pipe body, the lower conical pipe body is provided with a slag discharging port, and one end of the upper connecting pipe body stretching into the middle connecting pipe body is provided with a horn mouth structure.
2. The coal mine gas extraction device according to claim 1, wherein the axial flow fan comprises an impeller, the impeller is connected with a fan motor, a blade mounting hole is formed in the peripheral surface of the impeller, a mounting seat is fixedly arranged in the blade mounting hole, blades are rotatably mounted in the mounting seat through bearings, the blades are fixedly connected with a worm wheel, the worm wheel is connected with a worm, and the worm is connected with a first gear;
the impeller is internally provided with a rotation adjusting cavity, a second gear is arranged in the rotation adjusting cavity in a rotating mode, the second gear is meshed with the first gear, the second gear is connected with a second motor, and an output shaft of the second motor is connected with the second gear.
3. The coal mine gas extraction device according to claim 2, wherein a rotary mounting frame is fixedly arranged in the rotary adjusting chamber, the worm is rotatably mounted on the rotary mounting frame, an inner gear ring is further arranged in the rotary adjusting chamber and is meshed and matched with the first gear, and a limiting groove is formed in the rotary mounting frame.
4. The coal mine gas extraction device according to claim 3, wherein fixed pipes are respectively arranged on two sides of the rotary mounting frame, the impeller is provided with an impeller shaft, the impeller shaft is in transmission connection with an output shaft of the fan motor, the impeller shaft stretches into the fixed pipe on one side of the rotary mounting frame, and the impeller shaft is in rotary fit with the fixed pipe;
the second gear is provided with a second gear shaft, the second gear shaft is in transmission connection with an output shaft of the second motor, the second gear shaft stretches into a fixed pipe at the other side of the rotary mounting frame, and the second gear shaft is in rotary fit with the fixed pipe.
5. The coal mine gas extraction device according to claim 2, wherein a fan mounting frame is arranged in the second connecting pipe, the impeller is mounted on the windward side of the fan mounting frame, the fan motor is mounted on the windward side of the fan mounting frame, the second motor is mounted on the windward end of the impeller, the fan motor and the second motor are both provided with a closed cover, front guide vanes and rear guide vanes are arranged on two sides of the impeller in the second connecting pipe, a rectifying structure is arranged in front of the front guide vanes, and a diffusion structure is arranged behind the rear guide vanes.
6. The coal mine gas extraction device according to claim 1, wherein the venturi injector comprises a nozzle, an air suction chamber, a mixing section and a diffusion section, the nozzle is connected with a nozzle mounting pipe, the nozzle mounting pipe comprises an insertion part and a mounting part, the insertion part extends into the dust removal pipeline and is in sealing fit with the dust removal pipeline, a flange plate is fixedly arranged on the mounting part, a flange plate is fixedly arranged on the dust removal pipeline, and a first locking bolt and a tightening bolt are arranged between the two flange plates;
The two flange plates are provided with through holes for the first locking bolts to pass through, the flange plate on the dust removal pipeline is provided with threaded holes in threaded fit with the abutting bolts, and the end parts of the abutting bolts are abutted with the flange plate of the mounting part;
The outer peripheral surface of the nozzle is slidably provided with a locking sleeve, one end of the locking sleeve is provided with an annular abutting part, the inner peripheral surface close to the other end of the locking sleeve is provided with threads, the outer peripheral surface of the nozzle is provided with an annular limiting protruding edge, the limiting protruding edge abuts against the abutting part, and the outer peripheral surface of the air suction chamber is provided with external threads matched with the internal threads of the locking sleeve.
7. The coal mine gas extraction device according to claim 6, wherein the insertion part is provided with a sealing groove, a sealing ring is arranged in the sealing groove, a flange plate is sleeved on the insertion part in a sliding manner, and a sealing ring is arranged between the flange plate on the insertion part and the flange plate on the dust removal pipeline and is connected with a second locking bolt;
And a sealing ring is arranged between the limiting convex edge and the abutting part.
8. The coal mine gas extraction device of claim 6, wherein the outlet end of the nozzle and the inlet end of the mixing section are located on the same plane, the diameter of the outlet end of the nozzle is equal to 1/2 of the diameter of the mixing section, the length-diameter ratio of the mixing section is 7, the length of the diffusion section is greater than 5 times of the length of the mixing section, and the included angle between the circumferential surface of the diffusion section and the axial direction is less than or equal to 6 degrees.
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| CN202111483603.8A CN114000914B (en) | 2021-12-07 | 2021-12-07 | Coal mine gas extraction device |
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Inventor after: Bai Yanlong Inventor after: Niu Shaopeng Inventor after: Gu Tengfei Inventor after: Chen Songjie Inventor after: Bian Weidong Inventor after: Jiang Mengmeng Inventor after: Yang Tianliang Inventor after: Xu Weidong Inventor after: Lu Hui Inventor after: Shi Yanchao Inventor after: Li Chengquan Inventor after: Zhou Binbin Inventor after: Jing Xuwu Inventor after: Fan Li Inventor before: Bai Yanlong Inventor before: Niu Shaopeng Inventor before: Gu Tengfei Inventor before: Chen Songjie Inventor before: Bian Weidong Inventor before: Jiang Mengmeng Inventor before: Yang Tianliang Inventor before: Xu Weidong Inventor before: Lu Hui Inventor before: Shi Yanchao Inventor before: Li Chengquan Inventor before: Zhou Binbin Inventor before: Jing Xuwu Inventor before: Fan Li |