CN114028917A - Dust removal and dehumidification device for mine gas pipeline multi-parameter measuring instrument - Google Patents
Dust removal and dehumidification device for mine gas pipeline multi-parameter measuring instrument Download PDFInfo
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- CN114028917A CN114028917A CN202111331004.4A CN202111331004A CN114028917A CN 114028917 A CN114028917 A CN 114028917A CN 202111331004 A CN202111331004 A CN 202111331004A CN 114028917 A CN114028917 A CN 114028917A
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- gas pipeline
- mine gas
- dehumidification device
- air
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- 239000000428 dust Substances 0.000 title claims abstract description 53
- 238000007791 dehumidification Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 65
- 238000001816 cooling Methods 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000007704 transition Effects 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000002274 desiccant Substances 0.000 claims description 6
- 210000003437 trachea Anatomy 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 239000003595 mist Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 48
- 238000005259 measurement Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/268—Drying gases or vapours by diffusion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a dust removal and dehumidification device for a mine gas pipeline multi-parameter tester, and belongs to the technical field of mine gas extraction safety. The device is including the inlet structure who is equipped with the inlet port, inlet port top intercommunication has the dust removal condenser, dust removal condenser side and humidity desicator intercommunication, be equipped with waterproof ventilative layer between dust removal condenser and the humidity desicator intercommunication department. The device solves the technical problem that the traditional measuring water and water mist seriously affect the measuring data of the concentration sensor, increases the measuring accuracy of the sensor and prolongs the service life of the sensor.
Description
Technical Field
The invention belongs to the technical field of mine gas extraction safety, and relates to a dust removal and dehumidification device for a mine gas pipeline multi-parameter measuring instrument.
Background
The gas belongs to gas with explosion hazard, the gas is easy to explode when the concentration of the gas is 5-15 percent and the toxic gas such as carbon monoxide has personal injury. In coal mines, if the gas pressure is too high, gas outburst is easily caused. Therefore, gas drainage before coal mining is of great importance, and the gas such as gas can be safely mined to what extent, and the concentration of the gas such as gas, carbon monoxide and the like in the drained gas needs to be accurately measured. However, when concentration sensors such as gas and carbon monoxide are used in pipelines to measure concentration, the measurement data of the concentration sensors are seriously affected by a large amount of water and water mist. In order to avoid distortion of the gas concentration data, the gas at the measurement of the concentration sensor must be dehumidified.
Under the background, if dust, water and partial water vapor in the measurement gas can be removed, the gas concentration sensor is protected, the measurement accuracy of the sensor is improved, and the service life of the sensor is prolonged.
Disclosure of Invention
In view of this, the invention aims to provide a dust removal and dehumidification device for a mine gas pipeline multi-parameter measuring instrument, which solves the technical problem that the traditional measuring water and water mist seriously affect the measuring data of a concentration sensor, increases the measuring accuracy of the sensor and prolongs the service life of the sensor.
In order to achieve the purpose, the invention provides the following technical scheme:
the dust removal and dehumidification device comprises an air inlet structure provided with an air inlet hole, wherein a dust removal condenser is communicated above the air inlet hole, the side surface of the dust removal condenser is communicated with a humidity dryer, and a waterproof and breathable layer is arranged between the dust removal condenser and the humidity dryer.
Furthermore, one end of the humidity dryer, which is far away from the dust removal condenser, is communicated with a gas pipe protective pipe through a conversion sealing joint, and the other end of the gas pipe protective pipe is communicated with a tester.
Furthermore, a sealing plug is arranged on the air inlet hole.
Further, inlet port department is equipped with three venthole side by side, venthole and the sealed intercommunication of apparatus, be equipped with the sealing plug in the venthole, be equipped with the sealed air cock of conical surface on the venthole, be equipped with net dog and steel ball between sealed air cock of conical surface and the venthole, make the venthole can only the folk prescription to exhaust.
Further, the dust removal condenser comprises a transparent dust removal condenser shell, a cooling cavity is arranged in the dust removal condenser shell, the cooling cavity is in a bottle shape, a flexible cooling metal net is arranged in the cooling cavity, and a movable transparent cooling cavity cover is arranged on the upper portion of the cooling cavity.
Further, a cavity is arranged in the humidity dryer, and a solid drying agent is filled in the cavity.
Further, be equipped with rather than matched with sealing plug on the conversion sealing joint, be connected with the air cock adapter on the sealing plug, be equipped with the air cock on the air cock adapter.
Further, the waterproof breathable layer is composed of a waterproof breathable film and a sealing ring for sealing the waterproof breathable film.
Furthermore, the trachea protection tube comprises a transition cavity shell which is fixed on the conversion sealing joint pressing block through a transition cavity connecting joint and a pressing nut, and one end of the transition cavity shell is connected with the protection tube joint.
The invention has the beneficial effects that:
a dust-removing dehumidifier for mine gas pipeline multi-parameter measuring instrument is characterized by that the dust, water and partial steam of coal dust and others in the measured gas entering the instrument can be removed by means of fine metal net, water-proofing air-permeable film and drying agent so as to protect the elements of precision instrument from being damaged by dust and water. The dust removal dehumidifier is small in size and light in weight, and is very suitable for being used in portable instruments under mine holes. And the check block and the steel ball arranged on the air outlet hole change the air outlet hole into a one-way channel, so that only air can be exhausted, and the technical problem that a sensor cavity in the measuring instrument is sucked with water and coal dust to damage the sensor can be effectively prevented.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a sectional view of a dedusting and dehumidifying device for a multi-parameter measuring instrument of a mine gas pipeline.
Reference numerals: an air inlet port 1, an air inlet 1-1, a first air outlet 1-2, a second air outlet 1-3, a third air outlet 1-4, a large sealing plug 1-11, a small sealing plug 1-12, a sealing plug pressing block 1-13, a conical surface sealing air tap 1-14, a stainless steel grid block 1-15, a stainless steel ball 1-16, a dust removal condenser 2, a dust removal condenser shell 2-1, a metal net 2-2, a cooling cavity cover 2-3, a waterproof breathable layer 3, a waterproof breathable film 3-1, a sealing ring 3-2, a humidity dryer 4, a dryer shell 4-1, a drying agent 4-2, a sealing ring 4-3, a conversion sealing joint 4-4, a conical sealing plug 4-5, an air tap adapter 4-6, a conversion sealing joint pressing block 4-7, a conical sealing joint pressing block 4-5, a conical sealing joint pressing block 4-6, a conical sealing joint pressing block 4-7, a conical sealing joint pressing block, a sealing and a sealing and a sealing block, a sealing and a sealing block, a sealing and a sealing block, a sealing block, a sealing block, a sealing a, The air pipe protective pipe comprises an air pipe protective pipe 5, a protective pipe connector 5-1, a transition cavity shell 5-2, a transition cavity connecting connector 5-3 and a compression nut 5-4.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the dust removal and dehumidification device for the mine gas pipeline multi-parameter tester comprises a gas inlet 1-1, a dust removal condenser 2 is arranged on the gas inlet 1-1, the side surface of the dust removal condenser 2 is communicated with a humidity dryer 4, a waterproof breathable layer 3 is arranged between the dust removal condenser 2 and the humidity dryer 4, the waterproof breathable layer 3 is composed of a waterproof breathable film 3-1 and a sealing ring 3-2, and one end, far away from the dust removal condenser 2, of the humidity dryer 4 is communicated with a gas pipe protective pipe 5 through a conversion sealing joint 4-4.
The air inlet 1-1 is arranged at the air inlet port 1 at the lower part of the dust removal and dehumidification device, and the air inlet 1-1 is also provided with a small-size sealing plug 1-12 and a sealing plug pressing block 1-13 for sealing the air inlet 1-11. The air inlet port 1 is also provided with three air outlet holes in parallel, the three air outlet holes are hermetically communicated with the tester, the three air outlet holes are respectively a first air outlet hole 1-2, a second air outlet hole 1-3 and a third air outlet hole 1-4, and the aperture of the 3 air outlet holes is sequentially increased; the air outlets are provided with conical surface sealing air nozzles 1-14 which are provided with corresponding sealing plugs and sealing plug pressing blocks 1-13, and the sealing plugs of the third air outlet 1-4 are large sealing plugs 1-11. The stainless steel grid check blocks 1-15 and the stainless steel balls 1-16 are arranged at the joints of the three air outlets and the conical sealing plug, so that the air outlets become one-way channels, only air can be exhausted, and dust and water can be effectively prevented from entering a tester from the air outlets when an external equipment pipeline is pulled out.
The dust removal condenser 2 comprises a transparent dust removal condenser shell 2-1, a cooling cavity is arranged in the dust removal condenser shell 2-1, the cooling cavity is in a bottle shape, a plurality of layers of flexible cooling metal nets 2-2 are arranged in the cooling cavity and used for dust removal and cooling, a movable transparent cooling cavity cover 2-3 is arranged at the upper part of the cooling cavity, and the cooling metal nets 2-2 can be conveniently replaced at any time.
The humidity dryer 4 comprises a transparent dryer shell 4-1, a cylindrical cavity is arranged in the dryer shell 4-1, a solid desiccant 4-2 is filled in the cavity, a sealing ring 4-3 is arranged between the dryer shell 4-1 and a conversion sealing joint 4-4, and the conversion sealing joint 4-4 is provided with a conical sealing plug 4-5 matched with the conversion sealing joint and a conversion sealing joint pressing block 4-7 for pressing the conversion sealing joint. The conical sealing plug 4-5 is connected with an air nozzle adapter 4-6, and the air nozzle adapter 4-6 is provided with a conical sealing air nozzle 1-14. The conical surface sealing air tap 1-14 extends into a transition cavity shell 5-2 of the air pipe protection pipe 5, the transition cavity shell 5-2 of the air pipe protection pipe 5 is fixed on a conversion sealing joint pressing block 4-7 through a transition cavity connecting joint 5-3 and a pressing nut 5-4, and the other end of the transition cavity shell 5-2 is connected with a protection pipe joint 5-1.
In the using process, gas to be measured enters from the gas inlet 1-1, when the gas passes through the cooling metal net 2-2 in the dust removal condenser 2, the temperature of a gas pair is reduced, water vapor in the gas is liquefied, partial water vapor in the gas is released, meanwhile dust such as coal dust and the like is also retained in the cooling metal net, the gas passing through the dust removal condenser 2 continuously passes through the waterproof breathable layer 3, the waterproof breathable film 3-1 in the waterproof breathable layer 3 further blocks the water in the gas in a cooling cavity in the dust removal condenser 2, the gas passing through the waterproof breathable layer 3 enters the humidity dryer 4, and when the gas passes through the drying agent 4-2 in the humidity dryer 4, the water vapor in the gas is absorbed again, so that the humidity of the water vapor in the gas is greatly reduced. The gas absorbed by the humidity dryer 4 enters the trachea protection tube 5 through the gas nozzle adapter 4-6 and the conical surface sealing gas nozzle 1-14 on the connector, the protection tube connector 5-1 of the trachea protection tube 5 is connected with a tester for detecting various parameters of the gas, and the detected gas is discharged through the three gas outlet holes.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a mine gas pipeline multi-parameter is dust removal dehydrating unit for apparatus which characterized in that: the air inlet structure comprises an air inlet structure provided with an air inlet hole, wherein a dust removal condenser is communicated above the air inlet hole, the side surface of the dust removal condenser is communicated with a humidity dryer, and a waterproof breathable layer is arranged between the dust removal condenser and the humidity dryer.
2. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 1, wherein: one end of the humidity dryer, which is far away from the dust removal condenser, is communicated with the air pipe protective pipe through a conversion sealing joint, and the other end of the air pipe protective pipe is communicated with the tester.
3. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 1, wherein: and a sealing plug is arranged on the air inlet.
4. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 1, wherein: the utility model discloses an air inlet, including inlet port department, venthole and apparatus, be equipped with the sealing plug in the venthole, be equipped with the sealed air cock of conical surface on the venthole, be equipped with net dog and steel ball between sealed air cock of conical surface and the venthole, make the venthole can only the folk prescription exhaust.
5. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 1, wherein: the dust removal condenser comprises a transparent dust removal condenser shell, a cooling cavity is arranged in the dust removal condenser shell and is in a bottle shape, a flexible cooling metal net is arranged in the cooling cavity, and a movable transparent cooling cavity cover is arranged on the upper portion of the cooling cavity.
6. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 1, wherein: a cavity is arranged in the humidity dryer, and a solid drying agent is filled in the cavity.
7. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 2, wherein: the conversion sealing joint is provided with a sealing plug matched with the conversion sealing joint, the sealing plug is connected with an air faucet adapter, and the air faucet adapter is provided with an air faucet.
8. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 1, wherein: the waterproof breathable layer is composed of a waterproof breathable film and a sealing ring for sealing the waterproof breathable film.
9. The dust removal and dehumidification device for the mine gas pipeline multi-parameter determinator according to claim 2, wherein: the trachea protection tube comprises a transition cavity shell fixed on the conversion sealing joint pressing block through a transition cavity connecting joint and a pressing nut, and one end of the transition cavity shell is connected with a protection tube joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111331004.4A CN114028917A (en) | 2021-11-11 | 2021-11-11 | Dust removal and dehumidification device for mine gas pipeline multi-parameter measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111331004.4A CN114028917A (en) | 2021-11-11 | 2021-11-11 | Dust removal and dehumidification device for mine gas pipeline multi-parameter measuring instrument |
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| Publication Number | Publication Date |
|---|---|
| CN114028917A true CN114028917A (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111331004.4A Pending CN114028917A (en) | 2021-11-11 | 2021-11-11 | Dust removal and dehumidification device for mine gas pipeline multi-parameter measuring instrument |
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| Country | Link |
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| CN (1) | CN114028917A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001038136A (en) * | 1999-07-28 | 2001-02-13 | Nikkiso Co Ltd | Gas dryer |
| CN204065052U (en) * | 2014-07-14 | 2014-12-31 | 南昌煤矿仪器设备厂 | A kind of mining gas concentration detecting sensor |
| CN206831691U (en) * | 2017-04-19 | 2018-01-02 | 北京英特伦智能技术有限公司 | A kind of indoor dehumidification dust removal machine |
| CN108979703A (en) * | 2018-08-15 | 2018-12-11 | 朱保平 | A kind of spray wet dust collector for pack builders' skill |
| CN212568710U (en) * | 2020-07-16 | 2021-02-19 | 江苏华力矿业科技有限公司 | Gas detection device with side leakage prevention air inlet valve |
| CN212748488U (en) * | 2020-07-21 | 2021-03-19 | 西安科技大学 | Dust collector for underground gas monitoring equipment |
| CN212904860U (en) * | 2020-06-06 | 2021-04-06 | 山西易安矿通科技有限公司 | Gas drainage parameter measuring device |
| CN214539574U (en) * | 2021-04-14 | 2021-10-29 | 重庆芯力源科技有限公司 | Negative pressure sealing structure of gas determinator and gas determinator |
-
2021
- 2021-11-11 CN CN202111331004.4A patent/CN114028917A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001038136A (en) * | 1999-07-28 | 2001-02-13 | Nikkiso Co Ltd | Gas dryer |
| CN204065052U (en) * | 2014-07-14 | 2014-12-31 | 南昌煤矿仪器设备厂 | A kind of mining gas concentration detecting sensor |
| CN206831691U (en) * | 2017-04-19 | 2018-01-02 | 北京英特伦智能技术有限公司 | A kind of indoor dehumidification dust removal machine |
| CN108979703A (en) * | 2018-08-15 | 2018-12-11 | 朱保平 | A kind of spray wet dust collector for pack builders' skill |
| CN212904860U (en) * | 2020-06-06 | 2021-04-06 | 山西易安矿通科技有限公司 | Gas drainage parameter measuring device |
| CN212568710U (en) * | 2020-07-16 | 2021-02-19 | 江苏华力矿业科技有限公司 | Gas detection device with side leakage prevention air inlet valve |
| CN212748488U (en) * | 2020-07-21 | 2021-03-19 | 西安科技大学 | Dust collector for underground gas monitoring equipment |
| CN214539574U (en) * | 2021-04-14 | 2021-10-29 | 重庆芯力源科技有限公司 | Negative pressure sealing structure of gas determinator and gas determinator |
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