CN107376144B - Closed breathing system for integral inert gas protection welding workshop - Google Patents
Closed breathing system for integral inert gas protection welding workshop Download PDFInfo
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- CN107376144B CN107376144B CN201710629476.5A CN201710629476A CN107376144B CN 107376144 B CN107376144 B CN 107376144B CN 201710629476 A CN201710629476 A CN 201710629476A CN 107376144 B CN107376144 B CN 107376144B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/02—Valves
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Abstract
The closed breathing system for the integral inert gas protection welding workshop comprises an airtight suit with a welding protective layer, and is worn by personnel needing to enter the airtight welding workshop; the air supply system is used for conveying air in the high-pressure air bottle into the airtight suit through an air supply pipeline; the exhaust system exhausts the breathing waste gas in the airtight suit to a buffer outside the workshop through an exhaust pipeline, the gas supply and exhaust pipelines are connected to the inside of the workshop in a penetrating way from the outside of the workshop, and a vacuum generator driven by high-pressure gas is arranged on the exhaust pipeline outside the workshop to provide the vacuum degree required by exhaust for the exhaust pipeline; the pressure sensor is arranged on a road section of the air supply and exhaust pipe outside the workshop; an oxygen concentration sensor provided on an air supply pipe section located outside the plant; and the computer control unit is positioned outside the workshop and used for controlling the vacuum driving gas valve and acquiring signals of the pressure sensor and the oxygen concentration sensor. The invention not only ensures the normal breathing of the operator, but also improves the protection effect of the inert gas.
Description
Technical Field
The invention relates to the technical field of welding processing, in particular to a closed personnel breathing system for an integral inert gas protection welding workshop.
Background
In order to control the content of harmful impurities (such as hydrogen, oxygen, and nitrogen) and prevent the structure from being shaped and the toughness from being reduced during the heat treatment and welding of some special material structures, a high-purity inert gas, an oxygen-free flux or a vacuum condition is generally adopted to protect a welding seam and a heat affected zone. For large structural parts and complex welding seams, a large airtight workshop is preferably constructed, the workshop is filled with high-purity inert gas, and personnel perform welding operation on the large structural parts in the workshop. Therefore, personnel need to be equipped with a special respiratory system, so that the physiological function and life safety of normal breathing of the personnel are ensured, and the environment pollution caused by the fact that respiratory gas is dissipated to a workshop inert gas environment is avoided.
Currently, there are two main types of respiratory devices used in toxic, hazardous, or anoxic environments: the breathing gas closed circulation oxygen regeneration respirator is provided with oxygen regeneration chemical agents and carbon dioxide and water vapor absorption agents, the continuous service time of the oxygen regeneration chemical agents is short, the load of people is large, the breathing gas is oxygen, oxygen poisoning is easy to cause, and the oxygen regeneration chemical agents are not suitable for long-time continuous wearing operation; and secondly, the self-holding type or long-tube type breathing device is used, the back of a worker carries an air bottle or the back of the worker supplies air under the pressure of a far end, and exhaled waste gas is exhausted to the surrounding environment through a one-way valve, so that the use of the device can pollute the inert gas protection environment in a workshop. Therefore, both breathing apparatuses are not suitable for high-concentration inert gas environments.
Disclosure of Invention
The applicant improves the above disadvantages in the prior art, and provides a closed breathing system for an integral inert gas shielded welding shop, which not only ensures normal breathing of the operator, but also improves the shielding effect of the inert gas, and is particularly suitable for a welding shop in a high-concentration inert gas environment.
The technical scheme of the invention is as follows:
the invention discloses a closed breathing system for an integral inert gas protection welding workshop, which comprises:
the closed welding protection outfit comprises an airtight suit with a welding protection layer, wherein the airtight suit is worn by operators needing to enter an airtight welding workshop, and an air inlet joint and an air outlet joint are arranged on the airtight suit;
the gas supply system comprises a first high-pressure gas cylinder with a first gas cylinder valve, wherein a gas outlet of the first high-pressure gas cylinder is connected with a gas inlet joint through a gas supply pipeline, a first gas supply main valve and a first stop valve are arranged on the gas supply pipeline, and the first gas supply main valve and the first stop valve are respectively positioned outside and inside the airtight welding workshop;
the exhaust system comprises an exhaust pipeline connected with an exhaust joint, a second stop valve, a buffer, a vacuum generator, a vacuum driving gas electromagnetic valve, a second gas supply main valve and a second high-pressure gas cylinder with a second gas cylinder valve are sequentially arranged on the exhaust pipeline along the exhaust direction, and an exhaust pipeline section between the second stop valve and the buffer is in airtight cross connection with an airtight welding workshop;
the pressure sensors are arranged on the pipeline sections of the air supply pipeline and the air exhaust pipeline which are positioned outside the airtight welding workshop;
an oxygen concentration sensor provided on a pipe section of the air supply pipeline located outside the airtight welding shop;
and the computer control unit is positioned outside the airtight welding workshop and is respectively connected with the vacuum driving gas electromagnetic valve, the pressure sensor and the oxygen concentration sensor through control cables.
The further technical scheme is as follows:
an air supply pipeline section between the first stop valve and the air inlet joint is connected with an emergency pipeline through a three-way valve, and the emergency pipeline is connected with an air outlet of a high-pressure air bottle III with an air bottle valve III; and a second three-way valve is arranged on the exhaust pipeline section between the exhaust joint and the second stop valve, and one outlet of the second three-way valve is directly communicated with the inside of the airtight welding workshop.
And a first quick connector is arranged on the pipeline section of the air supply pipeline between the first stop valve and the first three-way valve and on the pipeline section between the second three-way valve and the second stop valve, and the first quick connector is a double-end shutoff type connector.
The gas supply system is characterized in that pressure reducers are arranged on a gas supply pipeline section between a first gas supply main valve and an airtight welding workshop and on a gas exhaust pipeline section between a second gas supply main valve and a vacuum generator, pressure sensors are arranged on the gas supply pipeline section between the first gas supply main valve and a high-pressure gas cylinder, the gas exhaust pipeline section between the second gas supply main valve and the high-pressure gas cylinder, and the gas supply pipeline section and the gas exhaust pipeline section on one side, close to the airtight welding workshop, of the two pressure reducers.
And a pressure reducer is arranged on the emergency pipeline section between the first three-way valve and the third high-pressure gas cylinder.
A safety valve, a flow regulating valve and a flowmeter are arranged on the gas supply pipeline section between the pressure reducer on the gas supply pipeline and the airtight welding workshop, a safety valve is arranged on the gas exhaust pipeline section between the pressure reducer on the gas exhaust pipeline and the vacuum generator, and a flowmeter is arranged on the gas exhaust pipeline between the buffer and the airtight welding workshop; the safety valve, the flow regulating valve and the flow meter are all connected with the computer control unit through control cables.
And a vacuum pressure sensor is arranged on the buffer and is connected with the computer control unit through a control cable.
And a one-way valve is arranged on the pipeline section of the air supply pipeline between the first three-way valve and the air inlet joint.
And voice communication equipment is arranged in the airtight suit and is connected with the computer control unit through a communication cable.
The invention has the technical effects that:
the invention can realize the normal breathing and welding protection functions of personnel in a workshop in a high-concentration inert gas environment, has clear system principle and mature component parts, carries out emergency backup on a gas supply and exhaust system and has higher system safety and reliability.
Drawings
Fig. 1 is a schematic structural diagram of a closed breathing system for an integral inert gas shielded welding shop according to the present invention, in which a two-dot chain line is a hermetic welding shop, a dashed line is a control cable, and the closed welding protection equipment is a back view.
Fig. 2 is a front view of the hermetic welding protection kit of the present invention.
Wherein: 1. air-tight clothes; 2. welding a protective layer; 3. an airtight welding shop; 4. an air inlet joint; 5. an exhaust joint; 6. a first gas cylinder valve; 7. a first high-pressure gas cylinder; 8. a gas supply line; 9. a first air supply main valve; 10. a first stop valve; 11. an exhaust line; 12. a second stop valve; 13. a vacuum generator; 14. a vacuum driven gas solenoid valve; 15. a second air supply main valve; 16. a second cylinder valve; 17. a second high-pressure gas cylinder; 18. a pressure sensor; 19. an oxygen concentration sensor; 20. a computer control unit; 21. a first three-way valve; 22. an emergency pipeline; 23. a cylinder valve III; 24. a high-pressure gas cylinder III; 25. a second three-way valve; 26. a first quick connector; 27. a pressure reducer; 28. a safety valve; 29. a flow regulating valve; 30. a flow meter; 31. a buffer; 32. a vacuum pressure sensor; 33. a one-way valve; 34. a voice communication device; 35. welding protective glasses; 36. a second quick connector; 37. the pipeline penetrates through the cabin.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Referring to fig. 1, the closed breathing system for an integral inert gas shielded welding plant according to the present invention comprises:
closed welding protection outfit is including having the airtight clothes 1 of welding inoxidizing coating 2, supplies the operating personnel that need get into in the airtight welding workshop 3 to dress, is equipped with air inlet joint 4, exhaust joint 5 on the airtight clothes 1. Specifically, the airtight suit 1 is of a whole-body wrapping type, namely, the trunk, four limbs and other parts of the head are all wrapped, the whole body is manufactured and processed as a whole except a wearing opening of a person, an airtight zipper is reserved at the wearing opening, after the person wears the suit, the suit is sealed by the airtight zipper, an airtight breathing space with a certain volume is formed inside the airtight suit 1, and a small amount of breathing air is stored to ensure the stability of breathing pressure; as shown in fig. 2, a welding protective glasses 35 with a large visual angle is arranged at the face position of an operator to provide a wide visual field for welding operation, and an air inlet joint 4 and an air outlet joint 5 are preferably arranged at the back brain position of the airtight garment 1 and are respectively used for being connected with an air supply system and an air outlet system; the welding protective layer 2 can be arranged into a whole-body shielding type or a local shielding type according to requirements and is used for protecting heat, light and sparks generated by welding operation; be equipped with voice communication equipment 34 in airtight suit 1, voice communication equipment 34 is speaker and microphone usually, and voice communication equipment 34 passes through the communication cable and is connected with computer control unit 20, and in order to make things convenient for personnel to shift the station, the communication cable sets up to two segmentation cables, and one of them section cable is fixed on airtight suit 1 to set up two quick-operation joint 36 on this section cable, be used for being located the staff's quick connect in airtight welding workshop 3 or cut off both ends communication cable.
The gas supply system comprises a first high-pressure gas cylinder 7 with a first gas cylinder valve 6, wherein a gas outlet of the first high-pressure gas cylinder 7 is connected with the gas inlet joint 4 through a gas supply pipeline 8, a first gas supply main valve 9 and a first stop valve 10 are arranged on the gas supply pipeline 8, and the first gas supply main valve 9 and the first stop valve 10 are respectively positioned outside and inside the airtight welding workshop 3; furthermore, an emergency air supply pipeline is further arranged and used when the air supply pipeline 8 has an air supply fault and other emergency working conditions, specifically, the pipeline section of the air supply pipeline 8 between the first stop valve 10 and the air inlet joint 4 is connected with an emergency pipeline 22 through a three-way valve 21, the emergency pipeline 22 is connected with an air outlet of a high-pressure air bottle three 24 with an air bottle valve three 23, and the emergency pipeline is arranged in the airtight welding workshop 3 and is carried by workers;
the exhaust system comprises an exhaust pipeline 11 connected with the exhaust joint 5, a second stop valve 12, a buffer 31, a vacuum generator 13, a vacuum driving gas electromagnetic valve 14, a second air supply main valve 15 and a second high-pressure air bottle 17 with a second air bottle valve 16 are sequentially arranged on the exhaust pipeline 11 according to the exhaust direction, and the pipeline section of the exhaust pipeline 11 between the second stop valve 12 and the buffer 31 is in airtight penetration connection with the airtight welding workshop 3; further, an emergency exhaust channel is further arranged and is used when the exhaust pipeline 11 has an emergency working condition such as an air supply fault, and the like, specifically, a second three-way valve 25 is arranged on the pipeline section of the exhaust pipeline 11 between the exhaust joint 5 and the second stop valve 12, one outlet of the second three-way valve 25 is directly communicated with the inside of the airtight welding workshop 3, and when emergency exhaust is needed, a worker enables an air inlet of the second three-way valve 25 to be communicated with the outlet communicated with the inside of the airtight welding workshop 3 through operation, and then the gas can be directly exhausted into the airtight welding workshop 3; the vacuum generator 13 can continuously create a certain vacuum degree in the exhaust pipeline 11, and establish the pressure difference between the closed breathing space of the staff in the airtight suit 1 and the exhaust pipeline 11, so as to realize the exhaust of the breathing waste gas of the staff. And a driving air source of the vacuum generator 13 is a second high-pressure air bottle 17, when the vacuum degree of the exhaust pipeline 11 is reduced to a certain value, the vacuum driving air electromagnetic valve 14 is opened, and high-pressure air in the second high-pressure air bottle 17 is controlled by a second air supply main valve 15 to be sent to the vacuum generator 13 to drive the vacuum generator 13 to work. The buffer 31 is used for ensuring the pressure in the exhaust pipeline 11 to be stable, the buffer 31 is provided with a vacuum pressure sensor 32, the vacuum pressure sensor 32 is connected with the computer control unit 20 through a control cable, and the gas exhausted from the exhaust pipeline 11 is finally exhausted into the buffer 31.
an oxygen concentration sensor 19 provided on a pipe section of the gas supply line 8 located outside the airtight welding shop 3;
and a computer control unit 20 located outside the hermetic welding plant 3 and connected to the vacuum drive gas solenoid valve 14, the pressure sensor 18, and the oxygen concentration sensor 19 via control cables, respectively.
In order to facilitate the transfer of welding stations by workers, partial pipeline sections of the air supply pipeline 8 and the exhaust pipeline 11 are fixed on the airtight suit 1, namely the pipeline section of the air supply pipeline 8 between the first three-way valve 21 and the air inlet connector 4 is fixed outside the airtight suit 1, the pipeline section of the exhaust pipeline 11 between the second three-way valve 25 and the exhaust connector 5 is also fixed on the airtight suit 1, in order to realize the quick connection and disconnection of the air supply and exhaust pipeline section fixed on the airtight suit 1 and the air supply and exhaust pipeline section not fixed on the airtight suit 1, the pipeline sections of the air supply pipeline 8 between the first stop valve 10 and the first three-way valve 21 and the pipeline sections between the second three-way valve 25 and the second stop valve 12 are respectively provided with a first quick connector 26, the first quick connectors 26 adopt existing double-end shut-off type connectors, when the connectors are disconnected.
A safety valve 28, a flow regulating valve 29 and a flow meter 30 are arranged on the pipeline section of the gas supply pipeline 8 between the pressure reducer 27 on the gas supply pipeline 8 and the airtight welding workshop 3, a safety valve 28 is arranged on the pipeline section of the gas exhaust pipeline 11 between the pressure reducer 27 on the gas exhaust pipeline 11 and the vacuum generator 13, and a flow meter 30 is arranged on the gas exhaust pipeline 11 between the buffer 31 and the airtight welding workshop 3; the safety valve 28, the flow regulating valve 29 and the flow meter 30 are all connected with the computer control unit 20 through control cables. The safety valve 28 is arranged, so that the corresponding pipeline can automatically release when overpressure occurs, and safety is guaranteed; the flow rate can be detected and adjusted by the flow rate adjusting valve 29 and the flow meter 30.
In order to avoid the backflow of the breathing gas in the gas supply pipeline 8 and the emergency pipeline 22, a one-way valve 33 is arranged on the pipeline section of the gas supply pipeline 8 between the three-way valve I21 and the gas inlet joint 4.
When the air supply pipeline 8, the exhaust pipeline 11 and the communication cable are connected with the airtight welding workshop 3 in a penetrating mode, pipeline cabin penetrating pieces 37 are adopted to achieve sealed connection of all pipelines, and the pipeline cabin penetrating pieces 37 are important accessories of a ship pipeline system.
The staff dresses closed welding protection harness gets into in the airtight welding workshop 3, connects the quick connector 26 on air supply line 8 and the exhaust pipe 11, starts normal air supply and exhaust system, supplies exhaust system, computer control unit and leads to voice communication and confirms normal back, closes airtight zip fastener carries out airtight, closes the airtight door of airtight welding workshop 3, carries out the conversion of air to the inert gas environment through modes such as blowing in the airtight welding workshop 3, treats that inert gas concentration satisfies the back, and the personnel begin welding operation.
In the welding operation process, high-pressure air in a high-pressure air bottle I7 is sequentially sent into the airtight suit 1 through an air bottle valve I6, an air supply main valve I9, a pressure reducer 27, a flow regulating valve 29, a flow meter 30, an oxygen concentration sensor 19, a pipeline cabin penetrating piece 37 on an air supply pipeline 1, a stop valve I10, a quick connector I26 on the air supply pipeline 1, a three-way valve I21 and an air inlet connector 4, when an emergency working condition occurs, air is supplied by using a portable high-pressure air bottle III 24 and an emergency pipeline 22, and normal and emergency air supply can be realized; the high-pressure air of the second high-pressure air bottle 17 is decompressed and then sent to the vacuum generator 13 to drive the vacuum generator 13, so that a certain vacuum degree is continuously created for the exhaust pipeline, the breathing waste gas of personnel in the airtight suit 1 is discharged into the buffer 31 through the exhaust joint 5, the second three-way valve 25, the first quick joint 26 on the exhaust pipeline 1, the second stop valve 12, the pipeline cabin penetrating part 37 on the exhaust pipeline 11 and the flowmeter 30 under the vacuum effect, and when an emergency working condition occurs, the personnel can directly discharge the waste gas into the airtight welding workshop 3 through the emergency exhaust port of the second three-way valve 25.
During the welding operation, personnel can transfer the welding station through the first quick connector 26 of the air supply and exhaust system. And after the welding operation is finished, opening an airtight door of the airtight welding workshop 3, and removing the closed welding protection tool after the workshop recovers a normal air environment.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (9)
1. A closed respiratory for integral inert gas protects welding shop, its characterized in that includes:
the closed welding protection outfit comprises an airtight suit (1) with a welding protective layer (2) and is worn by operators needing to enter an airtight welding workshop (3), and an air inlet joint (4) and an air outlet joint (5) are arranged on the airtight suit (1);
the gas supply system comprises a first high-pressure gas cylinder (7) with a first gas cylinder valve (6), wherein a gas outlet of the first high-pressure gas cylinder (7) is connected with the gas inlet joint (4) through a gas supply pipeline (8), a first gas supply main valve (9) and a first stop valve (10) are arranged on the gas supply pipeline (8), and the first gas supply main valve (9) and the first stop valve (10) are respectively positioned outside and inside the airtight welding workshop (3);
the exhaust system comprises an exhaust pipeline (11) connected with an exhaust joint (5), a second stop valve (12), a buffer (31), a vacuum generator (13), a vacuum driving gas electromagnetic valve (14), a second gas supply main valve (15) and a second high-pressure gas cylinder (17) with a second gas cylinder valve (16) are sequentially arranged on the exhaust pipeline (11) according to the exhaust direction, and a pipeline section of the exhaust pipeline (11) between the second stop valve (12) and the buffer (31) is in airtight cross connection with the airtight welding workshop (3);
the pressure sensor (18) is arranged on the pipeline sections of the air supply pipeline (8) and the exhaust pipeline (11) which are positioned outside the airtight welding workshop (3);
an oxygen concentration sensor (19) provided on a pipe section of the gas supply line (8) located outside the airtight welding plant (3);
and the computer control unit (20) is positioned outside the airtight welding workshop (3) and is respectively connected with the vacuum driving gas electromagnetic valve (14), the pressure sensor (18) and the oxygen concentration sensor (19) through control cables.
2. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 1 wherein: the pipeline section of the air supply pipeline (8) between the first stop valve (10) and the air inlet connector (4) is connected with an emergency pipeline (22) through a three-way valve (21), and the emergency pipeline (22) is connected with an air outlet of a high-pressure air bottle III (24) with an air bottle valve III (23); and a second three-way valve (25) is arranged on the pipeline section of the exhaust pipeline (11) between the exhaust joint (5) and the second stop valve (12), and one outlet of the second three-way valve (25) is directly communicated with the inside of the airtight welding workshop (3).
3. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 2 wherein: and a first quick connector (26) is arranged on a pipeline section of the air supply pipeline (8) between the first stop valve (10) and the first three-way valve (21) and a pipeline section between the second three-way valve (25) and the second stop valve (12), and the first quick connector (26) is a double-end shutoff type connector.
4. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 1 wherein: on air supply line (8) pipeline section between air supply main valve (9) and airtight welding workshop (3), all be equipped with pressure reducer (27) on exhaust pipe (11) pipeline section between air supply main valve two (15) and vacuum generator (13), on air supply line (8) pipeline section between air supply main valve (9) and high-pressure gas cylinder (7), on exhaust pipe (11) pipeline section between air supply main valve two (15) and high-pressure gas cylinder two (17), all be equipped with a pressure sensor (18) on air supply line (8) pipeline section and exhaust pipe (11) pipeline section that two pressure reducers (27) are close to one side of airtight welding workshop (3).
5. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 2 wherein: and a pressure reducer (27) is arranged on the pipeline section of the emergency pipeline (22) between the first three-way valve (21) and the third high-pressure gas cylinder (24).
6. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 4 wherein: a safety valve (28), a flow regulating valve (29) and a flowmeter (30) are arranged on the pipeline section of the gas supply pipeline (8) between the pressure reducer (27) on the gas supply pipeline (8) and the airtight welding workshop (3), the safety valve (28) is arranged on the pipeline section of the gas exhaust pipeline (11) between the pressure reducer (27) on the gas exhaust pipeline (11) and the vacuum generator (13), and the flowmeter (30) is arranged on the gas exhaust pipeline (11) between the buffer (31) and the airtight welding workshop (3); the safety valve (28), the flow regulating valve (29) and the flow meter (30) are all connected with the computer control unit (20) through control cables.
7. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 1 wherein: the buffer (31) is provided with a vacuum pressure sensor (32), and the vacuum pressure sensor (32) is connected with the computer control unit (20) through a control cable.
8. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 2 wherein: and a one-way valve (33) is arranged on the pipeline section of the air supply pipeline (8) between the three-way valve I (21) and the air inlet joint (4).
9. A closed breathing system for an integral inert gas shielded welding plant as set forth in claim 1 wherein: the air-tight suit (1) is internally provided with voice communication equipment (34), and the voice communication equipment (34) is connected with the computer control unit (20) through a communication cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710629476.5A CN107376144B (en) | 2017-07-28 | 2017-07-28 | Closed breathing system for integral inert gas protection welding workshop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710629476.5A CN107376144B (en) | 2017-07-28 | 2017-07-28 | Closed breathing system for integral inert gas protection welding workshop |
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| CN107376144A CN107376144A (en) | 2017-11-24 |
| CN107376144B true CN107376144B (en) | 2020-04-03 |
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| CN201710629476.5A Active CN107376144B (en) | 2017-07-28 | 2017-07-28 | Closed breathing system for integral inert gas protection welding workshop |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110841210B (en) * | 2019-10-12 | 2021-05-07 | 哈尔滨飞机工业集团有限责任公司 | Electric control type centralized oxygen system |
| CN111420319A (en) * | 2020-04-01 | 2020-07-17 | 北京航天新风机械设备有限责任公司 | Positive pressure protection hood intelligent monitoring system based on Bluetooth transmission |
| CN111791002B (en) * | 2020-07-27 | 2022-06-21 | 中国船舶科学研究中心 | Non-ferrous metal gas full-protection welding workshop and operation method thereof |
| CN113639199B (en) * | 2021-08-13 | 2023-07-14 | 烟台宏远载人压力舱工程技术研究院有限公司 | Air supply system of motorized rescue transport cabin |
| CN115817867B (en) * | 2022-12-30 | 2023-11-24 | 中国科学院空间应用工程与技术中心 | On-line maintenance operation box for space station effective load |
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| CN101622035A (en) * | 2007-03-23 | 2010-01-06 | 3M创新有限公司 | Air delivery apparatus for respirator hood |
| EP2589425A1 (en) * | 2011-11-04 | 2013-05-08 | Idroenergy SPA | Stripping and purifying tower for an electrolytic generator |
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| CN87204122U (en) * | 1987-04-14 | 1988-05-25 | 化学工业部湘东化工机械厂 | Protector for welding in container |
| CN2551272Y (en) * | 2002-06-14 | 2003-05-21 | 王建龙 | Closed bathroom oxygen supply device |
| CN101622035A (en) * | 2007-03-23 | 2010-01-06 | 3M创新有限公司 | Air delivery apparatus for respirator hood |
| CN101417163A (en) * | 2008-11-21 | 2009-04-29 | 山西虹安科技股份有限公司 | Personal emergency rescuing protection life support system |
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| CN107376144A (en) | 2017-11-24 |
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