CN108507024A - A kind of air cleaning unit for dust free room - Google Patents

A kind of air cleaning unit for dust free room Download PDF

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Publication number
CN108507024A
CN108507024A CN201810436601.5A CN201810436601A CN108507024A CN 108507024 A CN108507024 A CN 108507024A CN 201810436601 A CN201810436601 A CN 201810436601A CN 108507024 A CN108507024 A CN 108507024A
Authority
CN
China
Prior art keywords
air
pipe
babinet
blast pipe
free room
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201810436601.5A
Other languages
Chinese (zh)
Inventor
张瑞春
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Rui Hiro Air Purification Co Ltd
Original Assignee
Suzhou Rui Hiro Air Purification Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Rui Hiro Air Purification Co Ltd filed Critical Suzhou Rui Hiro Air Purification Co Ltd
Priority to CN201810436601.5A priority Critical patent/CN108507024A/en
Publication of CN108507024A publication Critical patent/CN108507024A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02Ducting arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02Ducting arrangements
    • F24F13/0209Ducting arrangements characterised by their connecting means, e.g. flanges
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/20Casings or covers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28Arrangement or mounting of filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/15Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
    • F24F8/158Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Ventilation (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention discloses a kind of air cleaning units for dust free room,Including babinet,The cabinets cavity center is equipped with suction ventilator,The suction ventilator top is connected separately with blast pipe and discharge pipe with bottom end,And the blast pipe is respectively perpendicular the top and bottom through the babinet with discharge pipe,The blast pipe top is connected with protection net,Ventilation pipe is equipped with below the protection net,And the ventilation seal of tube connection is in the blast pipe top right side,The ventilation tube top portion is equipped with check valve,And the check valve is located above the babinet,Structure of the invention is compact,It is reliable and stable,It is easy to operate,It is easily installed use,With dedusting,The function of rainwater-proof and ventilation,Using the design of air blow and return integral type,Reduce and uses additional pipeline,Dustless indoor air circulation is enabled to utilize,Avoid the waste of clean air-flow,Energy conservation and environmental protection,Air can effectively be purified,Improve dustless indoor air quality.

Description

A kind of air cleaning unit for dust free room
Technical field
The present invention relates to dust free room equipment technical fields, specially a kind of air cleaning unit for dust free room.
Background technology
Dust free room is the basis of contamination control, Airborne particulate concentration is controlled, to reach Particulate Cleanliness degree appropriate Rank, dust free room refer to by the contaminant exclusion of particulate, noxious air, bacterium in the air within the scope of certain space etc., And by the temperature of interior, cleanliness factor, room pressure, air velocity and air flow method, noise vibration and illumination, Electrostatic Control at certain In one range of needs, and give specially designed room.
And the air cleaning unit of existing dust free room, changing for indoor and outdoor is typically carried out by suction ventilator and pressure fan Gas increases the use of electric energy, it is also necessary to is exhausted using additional pipeline, increase installation difficulty and occupied space, had Air cleaning unit, indoor clean air cannot be recycled so that indoor clean air-flow is wasted, ventilation effect compared with Difference, air cleaning unit also cannot reduce the flow velocity that air is got in, cause air purification not thorough enough, influence room Interior air quality also much cannot be satisfied requirement of the current people to the product in this way.
So how to design a kind of air cleaning unit for dust free room, becoming us will currently solve the problems, such as.
Invention content
The purpose of the present invention is to provide a kind of air cleaning units for dust free room, to solve in above-mentioned background technology The problem of proposition.
To achieve the above object, the present invention provides the following technical solutions:A kind of air cleaning unit for dust free room, packet Babinet is included, the cabinets cavity center is equipped with suction ventilator, and the suction ventilator top is connected separately with blast pipe and goes out with bottom end Air hose, and the blast pipe is respectively perpendicular the top and bottom through the babinet, the connection of blast pipe top with discharge pipe There is protection net, ventilation pipe is equipped with below the protection net, and ventilation seal of tube connection is in the blast pipe top right Side, the ventilation tube top portion is equipped with check valve, and the check valve is located above the babinet, is equipped with below the ventilation pipe Dust removal filter, and the dust removal filter is sleeved on the air inlet tube cavity center, the outlet air tube cavity uniformly divides side by side Multiple guide ducts are furnished with, the wind-guiding bottom of the tube is communicated with exhaust duct, and the exhaust duct is socketed in the outlet air by screw thread Tube bottom end, the air draft tube cavity is equipped with high efficiency particulate air filter and activated carbon filter layer, and the activated carbon filter layer is located at institute It states below high efficiency particulate air filter, mounting plate is connected on the outside of the babinet, the mounting plate top is connected with rain cover by holder, And the rain cover is located above the protection net, accumulator is equipped on the left of the suction ventilator, and the accumulator is mounted on The cabinets cavity bottom, the bottom of box left side are equipped with control switch, and control switch, accumulator and suction ventilator It is connected by electric wire.
Further, the blast pipe is sealedly connected on the air inlet and air outlet of the suction ventilator with discharge pipe respectively.
Further, the protection net is set as spherical structure, and the protection net is covered in the air inlet tube top End.
Further, the ventilation pipe is set as Z-shaped structure, and ventilation pipe runs through the top of the box and bottom, right Side.
Further, the discharge area of the exhaust duct is more than the discharge area of the discharge pipe.
Further, the high efficiency particulate air filter uses antimicrobial form non-inductive windings high efficiency particle air filter.
Compared with prior art, the beneficial effects of the invention are as follows:This kind is used for the air cleaning unit of dust free room, and structure is tight It gathers, it is reliable and stable, it is easy to operate, it is easily installed use, has the function of dedusting, rainwater-proof and ventilation, using air blow and return one The design of formula reduces using additional pipeline, enables to dustless indoor air circulation to utilize, avoids clean air-flow Waste, energy conservation and environmental protection can effectively purify air, improve dustless indoor air quality, be pacified babinet by mounting plate At the top of the dust free room, convenient for the reflux of the entrance and inner air of extraneous air so that circulating internal air, by Outlet air tube cavity is provided with multiple guide ducts so that air is even into reduction air velocity so that filtering is more thorough, passes through High efficiency particulate air filter and activated carbon filter layer are installed in exhaust duct, can effectively purify air so that air is cleaner pure and fresh, By taking a breath, pipe is connected to blast pipe, and is equipped with check valve in ventilation tube top portion, can prevent room air from flowing back so that dry Net airflow circulating utilizes, energy conservation and environmental protection, so air cleaning unit of this kind for dust free room has wide application market.
Description of the drawings
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the tool with the present invention Body embodiment is used to explain the present invention together, not be construed as limiting the invention.
Fig. 1 is the overall structure diagram of the present invention;
Fig. 2 is the overlooking structure diagram of the present invention;
Fig. 3 is the side structure schematic view of the present invention;
Figure label:1, babinet;2, suction ventilator;3, blast pipe;4, discharge pipe;5, protection net;6, ventilation pipe;7, unidirectional Valve;8, dust removal filter;9, guide duct;10, exhaust duct;11, high efficiency particulate air filter;12, activated carbon filter layer;13, mounting plate; 14, rain cover;15, accumulator;16, control switch.
Specific implementation mode
The present invention is further illustrated With reference to embodiment, wherein attached drawing only for illustration, What is indicated is only schematic diagram rather than pictorial diagram, should not be understood as the limitation to this patent, tool in order to better illustrate the present invention Body embodiment, the certain components of attached drawing have omission, zoom in or out, and the size of actual product are not represented, to this field skill For art personnel, the omitting of some known structures and their instructions in the attached drawings are understandable, based on specific in the present invention Embodiment, every other specific implementation obtained by those of ordinary skill in the art without making creative efforts Mode shall fall within the protection scope of the present invention.
- Fig. 3 is please referred to Fig.1, the present invention provides a kind of technical solution:A kind of air cleaning unit for dust free room, packet Babinet 1 is included, 1 inner cavity center of the babinet is equipped with suction ventilator 2, and 2 top of the suction ventilator is connected separately with blast pipe 3 with bottom end With discharge pipe 4, and the blast pipe 3 and discharge pipe 4 are respectively perpendicular the top and bottom through the babinet 1, the blast pipe 3 Top is connected with protection net 5, and 5 lower section of the protection net is equipped with ventilation pipe 6, and the ventilation pipe 6 sealing connection is described 3 top right side of blast pipe, 6 top of the ventilation pipe is equipped with check valve 7, and the check valve 7 is located at 1 top of the babinet, 6 lower section of the ventilation pipe is equipped with dust removal filter 8, and the dust removal filter 8 is sleeved on 3 inner cavity of blast pipe center, institute It states 4 inner cavity of discharge pipe and multiple guide ducts 9 is uniformly distributed with side by side, 9 bottom of the guide duct is communicated with exhaust duct 10, and the row Air hose 10 is socketed in 4 bottom end of the discharge pipe by screw thread, and 10 inner cavity of the exhaust duct is equipped with high efficiency particulate air filter 11 and activity Charcoal filter layer 12, and the activated carbon filter layer 12 is located at 11 lower section of the high efficiency particulate air filter, 1 outside of the babinet is connected with peace Loading board 13,13 top of the mounting plate is connected with rain cover 14 by holder, and the rain cover 14 is located at the protection net 5 Top, 2 left side of the suction ventilator is equipped with accumulator 15, and the accumulator 15 is mounted on 1 intracavity bottom of the babinet, the case 1 bottom left of body is equipped with control switch 16, and the control switch 16, accumulator 15 are connect with suction ventilator 2 by electric wire, with The upper basic structure for constituting the present invention.
More specifically, the blast pipe 3 and discharge pipe 4 are sealedly connected on the air inlet of the suction ventilator 2 and go out respectively Air port, can by the suction ventilator 2 by external air delivery to the interior of dust free room, prevent gas leakage, improve sky The efficiency of gas transmission, the protection net 5 is set as spherical structure, and the protection net 5 is covered in the top of the blast pipe 3 End, can increase the air intake surface of blast pipe 3, have protective action, the ventilation pipe 6 is set as Z-shaped structure, and the ventilation is managed 6 on the right side of 1 top and bottom of the babinet, reduces using additional pipeline, reduces occupied space, enable to dust free room Interior air circulation utilizes, and avoids the waste of clean air-flow, and the discharge area of the exhaust duct 10 is more than the discharge pipe 4 Discharge area, convenient for the air of purification to be fed rapidly into the interior of dust free room, the high efficiency particulate air filter 11 uses antimicrobial form Non-inductive windings high efficiency particle air filter has antibacterial action, prevents bacterium from entering, can effectively purify air so that air is more dry It defecates newly, improves dustless indoor air quality.
The present invention improve in:This kind is used for the air cleaning unit of dust free room, when in use, first will by mounting plate 13 Babinet 1 is mounted at the top of dust free room, by being equipped with rain cover 14 above device, can be prevented from drenching with rain, then be opened by control It closes 16 and opens suction ventilator 2, external air is inhaled by blast pipe 3, then by dust removal filter 8, sky can be removed The dust of gas, then suction ventilator 2 air is passed through interior by discharge pipe 4, pass through guide duct 9 so that air even into, drop Low air flow speed can be purified effectively then by the high efficiency particulate air filter 11 and activated carbon filter layer 12 installed in exhaust duct 10 Air so that clean pure and fresh air is got in, and is connected to 10 top of exhaust duct by pipe 6 of taking a breath so that indoor air circulation Flowing reduces and uses additional pipeline so that dustless indoor air circulation utilizes, and avoids and wastes clean air-flow, leads to The check valve 7 installed at 6 top of ventilation pipe is crossed, can prevent room air from flowing back so that clean airflow circulating utilizes, energy saving Environmental protection.
While there has been shown and described that specific implementation mode of the invention, for those of ordinary skill in the art and Speech, it is possible to understand that without departing from the principles and spirit of the present invention, these specific implementation modes can be carried out a variety of Change, modification, replacement and modification, the scope of the present invention is defined by the appended.

Claims (6)

1. a kind of air cleaning unit for dust free room, including babinet (1), it is characterised in that:Babinet (1) the inner cavity center Suction ventilator (2) is installed, suction ventilator (2) top is connected separately with blast pipe (3) and discharge pipe (4) with bottom end, and described Blast pipe (3) is respectively perpendicular the top and bottom through the babinet (1), blast pipe (3) the top connection with discharge pipe (4) There is protection net (5), ventilation pipe (6) is equipped with below the protection net (5), and ventilation pipe (6) sealing connection is described Blast pipe (3) top right side, ventilation pipe (6) top is equipped with check valve (7), and the check valve (7) is located at the case Above body (1), be equipped with dust removal filter (8) below the ventilation pipe (6), and the dust removal filter (8) be sleeved on described in into Air hose (3) inner cavity center, multiple guide ducts (9), guide duct (9) bottom is uniformly distributed in discharge pipe (4) inner cavity side by side Portion is communicated with exhaust duct (10), and the exhaust duct (10) is socketed in the discharge pipe (4) bottom end, the exhaust duct by screw thread (10) inner cavity is equipped with high efficiency particulate air filter (11) and activated carbon filter layer (12), and the activated carbon filter layer (12) is positioned at described Below high efficiency particulate air filter (11), it is connected with mounting plate (13) on the outside of the babinet (1), passes through holder at the top of the mounting plate (13) It is connected with rain cover (14), and the rain cover (14) is located above the protection net (5), is set on the left of the suction ventilator (2) There is accumulator (15), and the accumulator (15) is mounted on the babinet (1) intracavity bottom, babinet (1) the bottom left peace (16) are switched equipped with control, and control switch (16), accumulator (15) are connect with suction ventilator (2) by electric wire.
2. a kind of air cleaning unit for dust free room according to claim 1, it is characterised in that:The blast pipe (3) air inlet and air outlet of the suction ventilator (2) are sealedly connected on respectively with discharge pipe (4).
3. a kind of air cleaning unit for dust free room according to claim 1, it is characterised in that:The protection net (5) it is set as spherical structure, and the protection net (5) is covered in the blast pipe (3) top.
4. a kind of air cleaning unit for dust free room according to claim 1, it is characterised in that:The ventilation pipe (6) it is set as Z-shaped structure, and ventilation pipe (6) is on the right side of the babinet (1) top and bottom.
5. a kind of air cleaning unit for dust free room according to claim 1, it is characterised in that:The exhaust duct (10) discharge area is more than the discharge area of the discharge pipe (4).
6. a kind of air cleaning unit for dust free room according to claim 1, it is characterised in that:The high efficiency filter Device (11) uses antimicrobial form non-inductive windings high efficiency particle air filter.
CN201810436601.5A 2018-05-09 2018-05-09 A kind of air cleaning unit for dust free room Withdrawn CN108507024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810436601.5A CN108507024A (en) 2018-05-09 2018-05-09 A kind of air cleaning unit for dust free room

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810436601.5A CN108507024A (en) 2018-05-09 2018-05-09 A kind of air cleaning unit for dust free room

Publications (1)

Publication Number Publication Date
CN108507024A true CN108507024A (en) 2018-09-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810436601.5A Withdrawn CN108507024A (en) 2018-05-09 2018-05-09 A kind of air cleaning unit for dust free room

Country Status (1)

Country Link
CN (1) CN108507024A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109356635A (en) * 2018-12-10 2019-02-19 河北能源职业技术学院 Safety of coal mines ventilation device
CN109631219A (en) * 2018-11-13 2019-04-16 冠恒建设工程有限公司 The decoration method of Multi-function cleaning room
CN109631220A (en) * 2018-11-13 2019-04-16 冠恒建设工程有限公司 The construction process of toilet is built using environment-friendly high-efficiency profile

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202930791U (en) * 2012-09-29 2013-05-08 安徽德信电气有限公司 Heat-dissipation device for switch cabinet
CN204534838U (en) * 2015-04-03 2015-08-05 广东梅雁吉祥水电股份有限公司 A kind of solar energy indoor air-purification device
CN204757165U (en) * 2015-06-23 2015-11-11 北京天宫环境科技(重庆)有限公司 Air purifier that can take a breath
CN204853698U (en) * 2015-08-26 2015-12-09 北京科慧通智慧科技有限公司 Roof solar energy air purifier
WO2016023481A1 (en) * 2014-08-13 2016-02-18 戴若夫 Air conditioner having smog cleansing functions
CN206160326U (en) * 2016-10-18 2017-05-10 天津市华诺盛源科技有限公司 Air outlet wind direction adjustable central air conditioning
CN206695240U (en) * 2017-05-16 2017-12-01 大田县瑞杰室内空气净化服务有限责任公司 A kind of high-rise buildings indoor air-purification device
CN208222680U (en) * 2018-05-09 2018-12-11 苏州瑞之弘空气净化有限公司 A kind of air cleaning unit for dust free room

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202930791U (en) * 2012-09-29 2013-05-08 安徽德信电气有限公司 Heat-dissipation device for switch cabinet
WO2016023481A1 (en) * 2014-08-13 2016-02-18 戴若夫 Air conditioner having smog cleansing functions
CN204534838U (en) * 2015-04-03 2015-08-05 广东梅雁吉祥水电股份有限公司 A kind of solar energy indoor air-purification device
CN204757165U (en) * 2015-06-23 2015-11-11 北京天宫环境科技(重庆)有限公司 Air purifier that can take a breath
CN204853698U (en) * 2015-08-26 2015-12-09 北京科慧通智慧科技有限公司 Roof solar energy air purifier
CN206160326U (en) * 2016-10-18 2017-05-10 天津市华诺盛源科技有限公司 Air outlet wind direction adjustable central air conditioning
CN206695240U (en) * 2017-05-16 2017-12-01 大田县瑞杰室内空气净化服务有限责任公司 A kind of high-rise buildings indoor air-purification device
CN208222680U (en) * 2018-05-09 2018-12-11 苏州瑞之弘空气净化有限公司 A kind of air cleaning unit for dust free room

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109631219A (en) * 2018-11-13 2019-04-16 冠恒建设工程有限公司 The decoration method of Multi-function cleaning room
CN109631220A (en) * 2018-11-13 2019-04-16 冠恒建设工程有限公司 The construction process of toilet is built using environment-friendly high-efficiency profile
CN109356635A (en) * 2018-12-10 2019-02-19 河北能源职业技术学院 Safety of coal mines ventilation device

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Application publication date: 20180907