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CN108008085A - The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device - Google Patents

The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device Download PDF

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Publication number
CN108008085A
CN108008085A CN201711434446.5A CN201711434446A CN108008085A CN 108008085 A CN108008085 A CN 108008085A CN 201711434446 A CN201711434446 A CN 201711434446A CN 108008085 A CN108008085 A CN 108008085A
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CN
China
Prior art keywords
poison gas
detection
pneumatic operated
gas
adsorbent media
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.)
Pending
Application number
CN201711434446.5A
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Chinese (zh)
Inventor
唐雄
郭海蓉
季永坚
周和武
胡建亮
顾峰
顾一峰
周永芳
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.)
Jiangxi Nofa Science And Technology Co Ltd
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Jiangxi Nofa Science And Technology Co Ltd
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Publication date
Application filed by Jiangxi Nofa Science And Technology Co Ltd filed Critical Jiangxi Nofa Science And Technology Co Ltd
Priority to CN201711434446.5A priority Critical patent/CN108008085A/en
Publication of CN108008085A publication Critical patent/CN108008085A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0062General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
    • G01N33/0063General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011Sample conditioning
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0022General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device, including detection of poison gas device (7), air driven pump (9), pneumatic operated valve (3,4,5), four-way pipe (6), coupling (1,2,8) and hose (13);One end of 3 pneumatic operated valves (3,4,5) is respectively with forming gas passage at cabinet exhaust ports coupling (2), processing equipment exhaust ports coupling (1) and adsorbent media container bottom adsorbent media 90%;The other end is commonly connected on four-way pipe (6);Another path of four-way pipe (6) is sequentially connected forms gas passage with coupling (8) at detection of poison gas device (7), air driven pump (9), equipment air inlet;Start air driven pump (2) work, control make one in 3 pneumatic operated valves to open, at three one in position at gas sample through being extracted, flow through detection of poison gas device (7), the Concentration Testing of gas sample is detected, and is finally discharged at equipment air inlet.

Description

The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device
Technical field
The invention belongs to dry process spy's tail-gas processing technology field, equipment in more particularly to a kind of tail gas treatment device The monitoring device in 90% service life of poison gas concentration and adsorbent media in exhaust outlet poison gas concentration, equipment cabinet.
Background technology
Dry type tail gas treatment device is used primarily in the industries such as semiconductor semiconductor, photovoltaic, LCD, in above-mentioned row In the production technology of industry, the substantial amounts of, special gas of broad categories can be used, these gases usually have hypertoxic, inflammable, tool corruption The features such as corrosion, therefore, when handling these gases, the demand for security to processing is very high, not only to consider the place of equipment Reason ability, need to also detect in equipment leakage, have corresponding real-time monitoring means on 2 points of equipment life;
At present, in dry type spy's tail-gas processing equipment:
Disposal ability detection means to equipment is mainly in the exhaust outlet installation color indicator detection exhaust of equipment Whether contain object gas, if so, then indicator color can change, illustrate that equipment disposal ability cannot be up to standard;
Processing means to equipment leakage are that the factory service end of the cabinet exhaust outlet of equipment and user links together, so that So that equipment solid is in a negative pressure state;
Color mainly is filled by going out separately installed one in absorbent container 90% to the means of equipment life detection The cylindrical transparent form of indicator, when indicator color changes, illustrates that adsorbent 90% has been used, the service life will Expire;
The above method has following shortcoming:
1. indicator can only judge to contain specific gas in tail gas, it is impossible to pass through the specific dense of color change reactions gas Degree;
2. often the service life of equipment is considerably longer than indicator, and the not obvious failure of indicator indicates, often It can cause the judgement of mistake or the waste of indicator;
3. such a determination methods need to visually be judged, that is, manual patrol is needed, timeliness is excessively poor;
4. equipment passively links together with factory factory service end, will inside equipment cabinet body when factory service end breaks down In normal pressure state, the security of equipment is greatly reduced;
5. staff does not know whether equipment is in leak condition, it may open and set in the state of equipment leakage It is standby, and then security incident occurs;
6. since equipment passively links together with factory service end, and then occur at the same time in factory service end failure and equipment leakage When, without emergency plan, leaked gas will be discharged into working region, cause environment, personnel and infringement and the later stage The expense of cleaning, if security incident occurs, loss is immeasurable;
7. the connection of form and container need to do encapsulation process, there is risk of leakage;
8. color indicator is easily influenced be subject to environment and causes sensitivity to change, so as to influence its indicated work Energy;
9. such a determination methods need to visually be judged, that is, manual patrol is needed, timeliness is excessively poor;
10. usual viewing window position (position in media container according to bottom 10%) is close from the ground, easily make it contaminated So as to observe inner case well or need to frequently do cleaning;
11. when replacing or do fixed-end forces, form is easily damaged, increase processing/use cost;
12. being indicated generally at, agent is sensitiveer, and the time of day of tail gas can not be reflected when color change occurs, i.e., without Method knows the feature such as concentration of exhaust gas at this time by it.
The content of the invention
In view of the deficiencies of the prior art, the present invention is intended to provide in a kind of tail gas treatment device diverse location poison gas concentration Monitoring device, can more obtain the poison gas concentration of equipment diverse location in real time and more accurately.
The technical scheme is that in a kind of tail gas treatment device diverse location poison gas concentration monitoring device, including Detection of poison gas device, air driven pump, pneumatic operated valve, four-way pipe, the coupling of processing equipment exhaust ports, cabinet exhaust ports steel pipe connect Coupling and hose at head, equipment air inlet;The pneumatic operated valve is 3, and one end of 3 pneumatic operated valves is arranged with cabinet respectively Gas is formed at gas port at coupling, the coupling of processing equipment exhaust ports and adsorbent media container bottom adsorbent media 90% Body carrying path;The other end is commonly connected on four-way pipe;Another path of four-way pipe is connected to the air inlet of detection of poison gas device Mouthful;The exhaust outlet of detection of poison gas device and the air inlet of air driven pump connect;The exhaust outlet of air driven pump is connected at equipment air inlet Coupling;Hose is used for being flexible coupling for each oral area;Start pneumatic pump work, make one in 3 pneumatic operated valves to open by control Open, in tail gas treatment device at cabinet exhaust outlet, processing equipment exhaust outlet and adsorbent media container bottom adsorbent media 90% this Gas sample at one in three flows through detection of poison gas device, the detection of detection of poison gas device is extracted gas sample through being extracted Concentration, then the gas passage through air driven pump be discharged at equipment air inlet.
Further, apparatus of the present invention further include flowmeter;The flowmeter is arranged on four-way pipe and detection of poison gas device Between gas passage on, with control and monitor through pneumatic operated valve enter detection of poison gas device gas flow.
Further, apparatus of the present invention further include steel pipe, and steel pipe one end is inserted into adsorbent media container bottom absorption matchmaker It is situated between at 90%, the other end stretches out adsorbent media container and is connected to pneumatic operated valve by pipe, more stably to obtain adsorbent media container Gas sample at bottom adsorbent media 90%.
Also further, the port that above-mentioned steel pipe is inserted at adsorbent media container bottom adsorbent media 90% is netted knot Structure, to prevent adsorbent media from entering and block steel pipe.
Also further, apparatus of the present invention further include controller, and controller is connected with pneumatic operated valve, to control in pneumatic operated valve Another two is closed during one unlatching.
Also further, apparatus of the present invention further include the human-computer interaction interface being connected with controller, to pass through artificial selection Control any one unlatching in pneumatic operated valve.
As the replacement of above-mentioned artificial selection control pneumatic operated valve, apparatus of the present invention further include the man-machine friendship being connected with controller Mutual interface, controller set each opening 20 seconds in pneumatic operated valve, and 3 pneumatic operated valves are opened in turn, and are shown in human-computer interaction interface Show pneumatic operated valve state.
Further, the controller of apparatus of the present invention is also connected with detection of poison gas device, receives the detection of detection of poison gas device The gas concentration signal of acquisition.
Further, controller noted above has gas concentration early warning and alarm setting.
Further, the Guan Weiwen hoses between above-mentioned steel pipe and pneumatic operated valve, freely stretch within the specific limits.
Gas sample is extracted at equipment exhaust outlet, cabinet exhaust outlet, absorbent container 90% with air hose respectively, it is soft The pipe other end connects three pneumatic control valves respectively, the ports of export of three pneumatic operated valves connect respectively three of a four-way pipe into Mouthful, four-way pipe another outlet connection detection of poison gas device import, detection of poison gas device the port of export connection air driven pump into Mouth end, the port of export of air driven pump are linked to tail gas treatment device air inlet, control three pneumatic operated valves to be opened per 20s by control system Open one, while two other is closed, so as to fulfill with a detection of poison gas device at the same time the exhaust outlet to equipment, It is detected at cabinet exhaust outlet and absorbent container 90%;
Compared with prior art, benefit of the invention is that:
1st, without having to worry about the color indicator service life the problem of, what system used is all mechanical components, more stable, more reliable And it can realize automation;
2nd, the monitoring to system processing power is more reliable, the misgivings that no color indicator exhausts or fails etc.;
3rd, due to using gas real-time monitoring device, completely solving problems with:
A) sensitivity, the accuracy critical function of device, will not be influenced because of the change of environment;
B), the gas relevant parameter detected will directly be changed into after electric signal and feeds back to PLC device by monitoring device, nothing Need manually make an inspection tour at any time, alarm will be sent automatically after exceeded, more in time, safer;
C), detection device can be contrasted with the concentration of real-time display gas, the intuitively environmentally friendly government decree with national regulation, The alarm output signal of monitoring device can be also adjusted to the standard of national requirements for environmental protection at the same time, when concentration is higher than setting value, System will send alarm command, allow user to understand equipment disposal ability in real time;
D), due to device can direct detection gas concentration, can more accurately judge to inhale by the numerical value that device detects Whether attached medium has been consumed 90% really, more efficient, more accurate;
4th, a whole set of structure is all by equipment active control, even if breaking down, equipment can also enter contingency mode, Bu Huifa Raw security incident;
5th, staff can the human-computer interaction interface of slave device or the alarm condition of equipment be directly viewable whether equipment has Leakage occurs, so as to avoid the generation of security incident from root;
6th, steel pipe and container are connected as being welded to connect, and greatly reduce risk of leakage;
7th, the detection at 90% 3 position of the disposal ability of equipment, cabinet exhaust detection and absorbent container only needs to use One detection of poison gas device, it is more efficient, more economical.
Brief description of the drawings
From the detailed description to the embodiment of the present invention below in conjunction with the accompanying drawings, of the invention these and/or other side and Advantage will become clearer and be easier to understand, wherein:
Attached drawing 1 is the apparatus structure schematic diagram of the embodiment of the present invention.
Embodiment
In order to make those skilled in the art more fully understand the present invention, with reference to the accompanying drawings and detailed description to this hair It is bright to be described in further detail.Here it is to be noted that it in the accompanying drawings, identical reference numeral, which is assigned, substantially to be had The part of same or like 26S Proteasome Structure and Function, and will omit on their repeated description.
Embodiment 1
The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device, as shown in Figure 1, including processing equipment Exhaust ports coupling 1, cabinet exhaust ports coupling 2, detection of poison gas device 7, coupling 8 at equipment air inlet, Air driven pump 9, pneumatic operated valve 3,4,5, four-way pipe 6, flowmeter 10, steel pipe 11, controller, PVC hose 13, bellows 12;
The pneumatic operated valve is 3, one end of 3 pneumatic operated valves 3,4,5 respectively with cabinet exhaust ports coupling 1, Gases transportation pathway is formed at processing equipment exhaust ports coupling 2 and adsorbent media container bottom adsorbent media 90%, its Middle needs illustrate, pneumatic operated valve and the company that gases transportation pathway is formed at adsorbent media container bottom adsorbent media 90% Connected bellows 12 and steel pipe 11 is completed jointly, 11 one end of steel pipe is inserted into adsorbent media container bottom adsorbent media 90% Place, the other end stretches out adsorbent media container and is connected to pneumatic operated valve by bellows 12, more stably to obtain adsorbent media container Gas sample at bottom adsorbent media 90%, and steel pipe 11 is inserted at adsorbent media container bottom adsorbent media 90% Port is net structure, to prevent adsorbent media from entering and block steel pipe 11;The other end is commonly connected on four-way pipe 6;
Another path of four-way pipe 6 is connected to 10 import of flowmeter;
The air inlet of the outlet of flowmeter 10 connection detection of poison gas device 7, flowmeter 10 are used to control and monitor through pneumatic operated valve Into the gas flow of detection of poison gas device 7;
The gas outlet of detection of poison gas device 7 is connected with the air inlet of air driven pump 9;
The exhaust outlet of air driven pump 9 is connected to the coupling 8 at equipment air inlet;
PVC hose 13 is used for being flexible coupling for each oral area;
Controller is connected with pneumatic operated valve 3,4,5, and another two is closed during controlling one in pneumatic operated valve 3,4,5 to open, this The controller of embodiment sets each opening 20 seconds in pneumatic operated valve 3,4,5, and 3 pneumatic operated valves are opened in turn, and in human-computer interaction 3,4,5 state of interface display pneumatic operated valve;
Controller is also connected with detection of poison gas device 7 at the same time, is received detection of poison gas device 2 and is detected the gas concentration letter obtained Number, and controller has gas concentration early warning and alarm setting, to exceed default normal concentration when the gas concentration of detection, sends out Go out early warning and alarm signal, remind manual intervention processing.
Therefore, when starting the work of air driven pump 2, controller controls one in 3 pneumatic operated valves to open two other closing, Cabinet exhaust outlet corresponding with the pneumatic operated valve of unlatching in tail gas treatment device, or reason equipment exhaust outlet, or adsorbent media container bottom The gas sample of portion's adsorbent media 90% is extracted, and flows through detection of poison gas device 7 through flowmeter 10, detection of poison gas device 7 detects The concentration of gas sample is extracted, the gas passage then through air driven pump 2 is discharged at equipment air inlet, is come back to inside equipment Carry out processing and avoid pollution environment, because each pneumatic operated valve is opened 20 seconds and opened in turn, so as to fulfill processing equipment difference position The poison gas concentration at the place of putting is monitored in real time in turn.
Various embodiments of the present invention are described above, described above is exemplary, and non-exclusive, and It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill Many modifications and changes will be apparent from for the those of ordinary skill in art field.Therefore, protection scope of the present invention should Scope of the claims should be subject to.

Claims (10)

1. the poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device, it is characterised in that filled including detection of poison gas Put (7), air driven pump (9), pneumatic operated valve (3,4,5), four-way pipe (6), processing equipment exhaust ports coupling (1), cabinet exhaust Coupling (2), coupling (8) and hose (13) at equipment air inlet at mouthful;
The pneumatic operated valve is 3, one end of 3 pneumatic operated valves (3,4,5) respectively with cabinet exhaust ports coupling (2), Gases transportation pathway is formed at processing equipment exhaust ports coupling (1) and adsorbent media container bottom adsorbent media 90%; The other end is commonly connected on four-way pipe (6);
Another path of four-way pipe (6) is connected to the air inlet of detection of poison gas device (7);
The exhaust outlet of detection of poison gas device (7) is connected with the air inlet of air driven pump (9);
The exhaust outlet of air driven pump (9) is connected to coupling (8) at equipment air inlet;
Hose (13) is used for being flexible coupling for each oral area;
Start air driven pump (2) work, make one in 3 pneumatic operated valves to open by control, cabinet is vented in tail gas treatment device Mouthful, at processing equipment exhaust outlet and adsorbent media container bottom adsorbent media 90% one in this three at gas sample through being taken out Take, flow through detection of poison gas device (7), detection of poison gas device (7) detects the concentration for being extracted gas sample, then through air driven pump (2) gas passage is discharged at equipment air inlet.
2. poison gas concentration monitoring device as claimed in claim 1, it is characterised in that further include flowmeter (10);The flow Meter (10) be arranged on the gas passage between four-way pipe (6) and detection of poison gas device (7), with control and monitor through pneumatic operated valve into Enter the gas flow of detection of poison gas device (7).
3. poison gas concentration monitoring device as claimed in claim 2, it is characterised in that further include steel pipe (11), steel pipe (11) one End is inserted at adsorbent media container bottom adsorbent media 90%, and the other end stretches out adsorbent media container and is connected to by pipe (12) Pneumatic operated valve, more stably to obtain the gas sample at adsorbent media container bottom adsorbent media 90%.
4. poison gas concentration monitoring device as claimed in claim 3, it is characterised in that the steel pipe (11) is inserted into adsorbent media Port at container bottom adsorbent media 90% is net structure, to prevent adsorbent media from entering and block steel pipe (11).
5. poison gas concentration monitoring device as claimed in claim 4, it is characterised in that further include controller, controller with it is pneumatic Valve (3,4,5) connects, and another two is closed during controlling one in pneumatic operated valve (3,4,5) to open.
6. poison gas concentration monitoring device as claimed in claim 5, it is characterised in that further include the man-machine friendship being connected with controller Mutual interface, to control any one unlatching in pneumatic operated valve (3,4,5) by artificial selection.
7. poison gas concentration monitoring device as claimed in claim 5, it is characterised in that further include the man-machine friendship being connected with controller Mutual interface, controller set each opening 20 seconds in pneumatic operated valve (3,4,5), and 3 pneumatic operated valves are opened in turn, and in human-computer interaction Interface display pneumatic operated valve (3,4,5) state.
8. poison gas concentration monitoring device as claimed in claim 7, it is characterised in that controller also with detection of poison gas device (7) Connection, receives the gas concentration signal that detection of poison gas device (2) detection obtains.
9. poison gas concentration monitoring device as claimed in claim 8, it is characterised in that the controller have gas concentration early warning and Alarm setting.
10. poison gas concentration monitoring device as claimed in claim 1, it is characterised in that the pipe (12) is line hose, certain In the range of freely stretch.
CN201711434446.5A 2017-12-26 2017-12-26 The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device Pending CN108008085A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711434446.5A CN108008085A (en) 2017-12-26 2017-12-26 The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711434446.5A CN108008085A (en) 2017-12-26 2017-12-26 The poison gas concentration monitoring device of diverse location in a kind of tail gas treatment device

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Publication Number Publication Date
CN108008085A true CN108008085A (en) 2018-05-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109458556A (en) * 2018-12-26 2019-03-12 南京信创电子设备有限公司 A kind of intelligent portable special gas safe transport cabinet

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US8205483B1 (en) * 2008-03-06 2012-06-26 The United States Of America As Represented By The Secretary Of The Army Residual life indicator
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CN105807670A (en) * 2016-05-10 2016-07-27 贵州电网有限责任公司电力科学研究院 Zero-pollution pump-back device and operating method thereof
CN205850594U (en) * 2016-07-15 2017-01-04 江苏艾尼尔建设集团有限公司 A kind of workshop air purifier
CN206208856U (en) * 2016-06-13 2017-05-31 山东极芯电子科技有限公司 A kind of carbonomonoxide concentration monitoring and warning system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10176270A (en) * 1996-12-13 1998-06-30 Nissin Electric Co Ltd Harmful matter removing device
US6162281A (en) * 1998-12-23 2000-12-19 Drager Sicherheitstechnik Gmbh Device and process for displaying the exhaustion of a gas filter
US20050087072A1 (en) * 2003-10-28 2005-04-28 Wodjenski Michael J. Gas cabinet including integrated effluent scrubber
KR20080102657A (en) * 2007-05-21 2008-11-26 김대현 Explosion Proof Gas Cylinder Storage Cabinet
US8205483B1 (en) * 2008-03-06 2012-06-26 The United States Of America As Represented By The Secretary Of The Army Residual life indicator
US20110036145A1 (en) * 2009-08-14 2011-02-17 Dobbyn Gregory J Ductless fume hood gas monitoring and detection system
CN102466540A (en) * 2010-11-05 2012-05-23 西安扩力机电科技有限公司 Poisonous gas detector for gas equipment
CN203986905U (en) * 2014-05-27 2014-12-10 安徽华盛科技控股股份有限公司 CIT intelligence gas cabinet
CN204637919U (en) * 2015-05-22 2015-09-16 昆山工研院新型平板显示技术中心有限公司 Exhaust treatment system and dry quarter equipment
KR200478233Y1 (en) * 2015-05-30 2015-09-18 조대복 Apparatus for detecting processing gas leak
CN105807670A (en) * 2016-05-10 2016-07-27 贵州电网有限责任公司电力科学研究院 Zero-pollution pump-back device and operating method thereof
CN206208856U (en) * 2016-06-13 2017-05-31 山东极芯电子科技有限公司 A kind of carbonomonoxide concentration monitoring and warning system
CN205850594U (en) * 2016-07-15 2017-01-04 江苏艾尼尔建设集团有限公司 A kind of workshop air purifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109458556A (en) * 2018-12-26 2019-03-12 南京信创电子设备有限公司 A kind of intelligent portable special gas safe transport cabinet
CN109458556B (en) * 2018-12-26 2024-03-26 南京信创电子设备有限公司 An intelligent portable special gas safety transfer cabinet

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Application publication date: 20180508