CN106581909B - Cross-shaped dry-chemical fire extinguishing cover system - Google Patents
Cross-shaped dry-chemical fire extinguishing cover system Download PDFInfo
- Publication number
- CN106581909B CN106581909B CN201611164201.0A CN201611164201A CN106581909B CN 106581909 B CN106581909 B CN 106581909B CN 201611164201 A CN201611164201 A CN 201611164201A CN 106581909 B CN106581909 B CN 106581909B
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- Prior art keywords
- fire extinguishing
- dry powder
- extinguishing agent
- millimeters
- cross
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- 239000000126 substance Substances 0.000 title claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 87
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 65
- 239000002184 metal Substances 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 12
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 239000007921 spray Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000014483 powder concentrate Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
Abstract
The invention discloses a kind of cross-shaped dry-chemical fire extinguishing cover systems, including by the sequentially connected High-Pressure Compressor of conveying steel pipe, high-order dry powder fire extinguishing agent storage container, powder extractor case of emanating, dry powder fire extinguishing agent injection apparatus, dry powder fire extinguishing agent injection apparatus includes the circular ring metal reinforcing rib of four delivery tube of four cross-likes, the metallic support being installed below dispatching pipe end, the distributor set on four delivery tube infalls, connection delivery tubes；The upper port of four delivery tubes is connected to distributor, and a concentric circles is closed and constituted to four dispatching pipe ends, is equipped with the dry powder fire extinguishing agent injection nozzle of opening vertically downward at equal intervals along delivery tube length direction；Pass through connection by metal hose between the conveying steel pipe and dry powder fire extinguishing agent distributor for powder extractor case output end of emanating.Extinguishing chemical is concentrated the root near zone for being ejected into combustion flame by the present invention, and quickly and effectively ground-to-ground the leakage combustible fire of down tube net is put out a fire.
Description
Technical field
The present invention relates to fire-fighting domains, more particularly to a kind of cross-shaped dry-chemical fire extinguishing cover system.
Background technique
In recent years, the complicated underground pipe network in China, frequent earth excavation or surface subsidence etc. cause piping failure
And causes fire incident and happen occasionally.The characteristics of due to pipeline jet stream fire, technical regulation require first put out a fire and could close
Maintenance of valve.And the extinguishing method fire extinguishing procedure of traditional hand spray dry powder fire extinguishing agent is both dangerous, can also waste a large amount of prices
Expensive extinguishing chemical, also generates secondary pollution, economic loss is larger after fire extinguishing.Especially extensive fire occurs for main conduit
When, fire extinguishing difficulty is big, seriously affects industrial production and daily life.And when using cyclic annular dry-chemical fire extinguishing cover system, spray
Loophole installation is asymmetric, and flash absorber is easy lodging when spray fire extinguishing agent；In addition, due to this body structure of cyclic annular dry-chemical fire extinguishing cover system
Limitation, be difficult to concentrate extinguishing chemical and be ejected into the root near zone of combustion flame, fire extinguishing coverage area is also restrained.Such as
When fruit satisfaction effectively improves fire extinguishing range, the volume of system structure will be excessively huge, makes troubles to transport and lifting.
Therefore it is urgent to provide a kind of novel fire-fighting modes for fire after underground piping leakage to solve the above problems.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of cross-shaped dry-chemical fire extinguishing cover system, can quickly,
Effectively ground-to-ground the leakage combustible fire of down tube net is put out a fire.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of cross-shaped dry powder is provided
Fire extinguishing cover system, including pass through the sequentially connected High-Pressure Compressor of dry powder fire extinguishing agent conveying steel pipe, high-order dry powder fire extinguishing agent
Storage container, powder extractor case of emanating, dry powder fire extinguishing agent injection apparatus；
Dry powder fire extinguishing agent injection apparatus includes the delivery tube of four cross-likes, is installed on the metal branch dispensed below pipe end
Frame, set on four delivery tube infalls distributor, connect four delivery tubes circular ring metal reinforcing rib；Distributor is divided into
The upper port of portion's cavity and four transitional cavities, every delivery tube is connected to by transitional cavity with upper chamber, and transitional cavity is in
Approximate funnel-form, top surface are a quarter of upper chamber bottom surface；A concentric circles is closed and constituted to four dispatching pipe ends,
It is equipped with the dry powder fire extinguishing agent of several openings vertically downward at equal intervals along delivery tube length direction and sprays nozzle；Positioned at powder extractor case of emanating
By connection by metal hose between the conveying steel pipe and dry powder fire extinguishing agent distributor of output end, the both ends of metal hose are equipped with locking
Connector.
In a preferred embodiment of the present invention, the material of delivery tube is stainless steel, and diameter is 50-60 millimeters, and wall thickness is
2-3 millimeters, for the dry powder fire extinguishing agent in delivery distributer.
In a preferred embodiment of the present invention, dry powder fire extinguishing agent injection nozzle is round hole, due at distributor
Pressure it is larger, aperture is gradually increased from top to bottom along delivery tube.
It further, is 10-15 millimeters positioned at the dry powder fire extinguishing agent injection nozzle diameter of delivery tube topmost, distance is matched
200-300 millimeters of pipe upper port is sent, the dry powder fire extinguishing agent injection nozzle diameter positioned at delivery tube lowest part is 35-40 millimeters,
400-500 millimeters of pipe end of distance dispatching.
In a preferred embodiment of the present invention, the material of distributor is stainless steel, and the wall thickness of upper chamber is 1-2 millis
Rice, is highly 300-400 millimeters, at top, integral type is provided with the stainless steel that length is 20 centimetres, diameter is 50-75 millimeters
Connecting tube, stainless steel upper end of connecting tube installation locking connector.The dry powder fire extinguishing agent that distributor carrys out metal hose conveying carries out
Buffer and be averagely allocated to four delivery tubes.
Further, the shape of the upper chamber of distributor is cylindrical or inverted round table shape, if upper chamber is cylinder
Body, then its interior diameter is 150-200 millimeters.
In a preferred embodiment of the present invention, dry powder extinguisher storage container top is equipped with charging hopper, is used for dry
Dry powder fire extinguishing agent is added in powder fire extinguisher storage container.
In a preferred embodiment of the present invention, it is 3-6 meters that four dispatching pipe ends, which surround concentric diameter of a circle, thus
One is formed completely without the flash absorber at dead angle on combustion flame top.
In a preferred embodiment of the present invention, the stabilization when in use to guarantee four dry powder fire extinguishing agent delivery tubes 8
Property and intensity requirement, the diameter of metal reinforcing be 25-30 millimeters.
In a preferred embodiment of the present invention, locked engagement device is metal fire-fighting connector, and diameter is 50-75 millimeters,
Wall thickness is 1-2 millimeters, and the locked engagement device is connected to metal hose, is used to feed dry powder fire extinguishing agent.
The beneficial effects of the present invention are:
(1) blow-off velocity of cross-shaped dry-chemical fire extinguishing cover system of the present invention is fast, fire-fighting efficiency is high, can will put out a fire
Agent dry powder concentrates the flame area for being ejected into leakage pipe fire, and covers combustion flame in large area, overcomes tradition
Sprinkling dry powder fire extinguishing agent fire-fighting efficiency is low, disadvantage that extinguishing chemical wastage is serious, meet and quickly and efficiently put out leakage
The purpose and technical requirements of pipeline fire.
(2) cross-shaped dry-chemical fire extinguishing cover system of the present invention is supported using the metallic support of certain altitude, can be with
The outlet and combustion flame root constant distance of fire-fighting powder nozzle are remained, so as to effectively spray extinguishing chemical
To the root near zone of combustion flame, extinguishing effect is enhanced, improves fire extinguishing progress.
(3) cross-shaped dry-chemical fire extinguishing cover system of the present invention not only ensure that the purpose effectively put out a fire, but also reach
It is small in size, it is economic and practical, it places, transformation, feature easy to maintenance.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of cross-shaped one preferred embodiment of dry-chemical fire extinguishing cover system of the present invention；
Fig. 2 is the schematic diagram of the section structure of the dry powder fire extinguishing agent injection apparatus；
Fig. 3 is the structural schematic diagram of the transitional cavity connection of the delivery tube and distributor；
Fig. 4 is the schematic diagram of the section structure of the delivery tube；
The components in the drawings are labeled as follows: 1, High-Pressure Compressor, 2, powder extractor case of emanating, 3, high-order dry powder fire extinguishing agent
Storage container, 4, dry powder fire extinguishing agent conveying steel pipe, 5, locked engagement device, 6, metal hose, 7, distributor, 71, upper chamber,
72, transitional cavity, 73, stainless steel connecting tube, 8, delivery tube, 9, dry powder fire extinguishing agent injection nozzle, 10, metal reinforcing, 11, gold
Belong to bracket, 12, charging hopper.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the present invention includes:
A kind of cross-shaped dry-chemical fire extinguishing cover system, including High-Pressure Compressor 1, high-order dry powder fire extinguishing agent storage hold
Device 3, powder extractor case 2 of emanating, dry powder fire extinguishing agent injection apparatus, High-Pressure Compressor 1, are penetrated at high-order dry powder fire extinguishing agent storage container 3
It is connected between gas powder extractor case 2 by dry powder fire extinguishing agent conveying steel pipe 4, is additionally provided with one section of dry powder in the output end for powder extractor case 2 of emanating
Extinguishing chemical conveying steel pipe 4, this section of dry powder fire extinguishing agent conveying steel pipe 4 are connect with dry powder fire extinguishing agent injection apparatus by metal hose 6,
For feed dry powder fire extinguishing agent.The input end of the metal hose 6 and the locked engagement device of 4 end of dry powder fire extinguishing agent conveying steel pipe
5 connections, outlet end is connected to by locked engagement device 5 with dry powder fire extinguishing agent injection apparatus.The locked engagement device 5 is that metal fire-fighting connects
Clutch, diameter are 50-75 millimeters, and wall thickness is 1-2 millimeters.Charging leakage is equipped on high-order 3 top of dry powder extinguisher storage container
Bucket 12.
The metal that dry powder fire extinguishing agent injection apparatus includes the delivery tube 8 of four cross-likes, is installed below 8 end of delivery tube
Bracket 11, set on four 8 infalls of delivery tube distributor 7, connect four delivery tubes 8 circular ring metal reinforcing rib 10.
In conjunction with Fig. 2, the material of distributor 7 is stainless steel, is divided into upper chamber 71 and four transitional cavities 72, upper chamber
71 wall thickness is 1-2 millimeters, is highly 300-400 millimeters, and at top, integral type is provided with that length is 20 centimetres, diameter is
50-75 millimeters of stainless steel connecting tube 73,73 upper end installation locking connector 5 of stainless steel connecting tube.The shape of upper chamber 71
For cylindrical or inverted round table shape, if upper chamber 71 is cylindrical body, interior diameter is 150-200 millimeters.Upper chamber 71
The dry powder fire extinguishing agent come to the conveying of metal hose 6 has buffer function.In conjunction with Fig. 3, the upper port of four delivery tubes 8 passes through transition
Cavity 72 is connected to upper chamber 71, and transitional cavity 72 is in approximate funnel-form, and top surface is a quarter of 7 bottom surface of distributor,
Shape is sector；Bottom shape is the shape of 8 nozzle of delivery tube.Transitional cavity 72 can be by the dry powder fire extinguishing agent in upper chamber 71
Four delivery tubes 8 are averagely allocated to, dry powder fire extinguishing agent is avoided to generate accumulation in upper chamber 71.
The material of delivery tube 8 is stainless steel, and diameter is 50-60 millimeters, and wall thickness is 2-3 millimeters, is used for delivery distributer 7
In dry powder fire extinguishing agent.Four 8 endcappeds of delivery tube simultaneously constitute a concentric circles, and concentric diameter of a circle is 3-6 meters, thus
Combustion flame top forms one completely without the flash absorber at dead angle.When in use for four dry powder fire extinguishing agent delivery tubes 8 of guarantee
Stability and intensity requirement are equipped with metal reinforcing 10 on the top of four delivery tubes 8, and material is stainless steel, a diameter of
25-30 millimeters, and metallic support 11 is installed below the end of delivery tube 8, metallic support 11 is made of fashioned iron, the fire extinguishing
The weight of overall system architecture is undertaken by metallic support 11.It is supported, can be remained using the metallic support 11 of certain altitude
The outlet and combustion flame root constant distance of fire-fighting powder nozzle, so as to which extinguishing chemical is effectively ejected into burning fire
The root near zone of flame, enhances extinguishing effect, improves fire extinguishing progress.In conjunction with Fig. 4, between 8 length direction of delivery tube etc.
Nozzle 9 is sprayed every being equipped with the dry powder fire extinguishing agent of several openings vertically downward, it is round hole that dry powder fire extinguishing agent, which sprays nozzle 9, due to
Pressure at distributor 7 is larger, and aperture is gradually increased from top to bottom along delivery tube 8, positioned at the dry of 8 topmost of delivery tube
It is 10-15 millimeters that powder extinguishing chemical, which sprays 9 diameter of nozzle, apart from 200-300 millimeters of 8 upper port of delivery tube, is located at delivery tube 8 most
Dry powder fire extinguishing agent injection 9 diameter of nozzle of lower part is 35-40 millimeters, apart from 400-500 millimeters of 8 end of delivery tube.
The working principle of the cross-shaped dry-chemical fire extinguishing cover system is: High-Pressure Compressor 1 is by the compression of high pressure
Air jet enters in powder extractor case 2 of emanating, and powder extractor case 2 of emanating generates negative pressure under the jet action of high-speed compressed air, from height
Aspirate dry powder fire extinguishing agent in position dry powder fire extinguishing agent storage container 3, the dry powder fire extinguishing agent of suction in powder extractor case 2 of emanating with high injection
Distributor 7 is supplied through dry powder fire extinguishing agent conveying steel pipe 4, locked engagement device 5, metal hose 6 after flowing air mixing and pressurizeing, then together
When be evenly supplied to four delivery tubes 8, it is enough dry that dry powder fire extinguishing agent in four delivery tubes 8 injection nozzle 9 ejects fineness
Powder extinguishing chemical, dry powder fire extinguishing agent diffuse and cover the combustion flame above leakage pipe, and combustion flame is by dry powder fire extinguishing agent
The coupling of Chemical Inhibition and impact, flame quickly extinguish.Dry powder fire extinguishing agent in high-order dry powder fire extinguishing agent storage container 1 is not
When sufficient, by manually or mechanically supplementing dry powder fire extinguishing agent from charging hopper 12.Metal hose 6 and distributor 7 and dry-chemical fire extinguishing
Agent conveying steel pipe 4 is connected using locked engagement device 5, prevents from threading off.
Cross-shaped dry-chemical fire extinguishing cover system of the present invention not only ensure that the purpose effectively put out a fire, but also reach volume
It is small, it is economic and practical, it places, transformation, feature easy to maintenance, blow-off velocity is fast, fire-fighting efficiency is high, can concentrate extinguishing chemical dry powder
It is ejected into the flame area of leakage pipe fire, and covers combustion flame in large area, overcomes traditional sprinkling dry powder
The disadvantage that the fire-fighting efficiency of extinguishing chemical is low, extinguishing chemical wastage is serious, meets and quickly and efficiently puts out leakage pipe fire
Purpose and technical requirements.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of cross-shaped dry-chemical fire extinguishing cover system, which is characterized in that including passing through dry powder fire extinguishing agent conveying steel pipe successively
The High-Pressure Compressor of connection, high-order dry powder fire extinguishing agent storage container, powder extractor case of emanating, dry powder fire extinguishing agent injection apparatus；
Dry powder fire extinguishing agent injection apparatus include the delivery tube of four cross-likes, be installed on dispatching pipe end below metallic support,
Set on four delivery tube infalls distributor, connect four delivery tubes circular ring metal reinforcing rib；Distributor is divided into top
The upper port of cavity and four transitional cavities, every delivery tube is connected to by transitional cavity with upper chamber, and transitional cavity is in close
Like funnel-form, top surface is a quarter of upper chamber bottom surface；Four dispatching pipe ends are closed and constitute a concentric circles, edge
Delivery tube length direction is equipped with the dry powder fire extinguishing agent injection nozzle of several openings vertically downward at equal intervals；It is defeated positioned at powder extractor case of emanating
By connection by metal hose between the conveying steel pipe and dry powder fire extinguishing agent distributor of outlet, the both ends of metal hose are equipped with locking and connect
Clutch.
2. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that the material of delivery tube is not
Become rusty steel, and diameter is 50-60 millimeters, and wall thickness is 2-3 millimeters.
3. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that dry powder fire extinguishing agent injection pipe
Mouth is round hole, and aperture is gradually increased from top to bottom along delivery tube.
4. cross-shaped dry-chemical fire extinguishing cover system according to claim 3, which is characterized in that be located at delivery tube topmost
Dry powder fire extinguishing agent injection nozzle diameter be 10-15 millimeters, apart from 200-300 millimeters of delivery tube upper port, be located at delivery tube
The dry powder fire extinguishing agent injection nozzle diameter of lowest part is 35-40 millimeters, 400-500 millimeters of pipe end of distance dispatching.
5. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that the material of distributor is not
Become rusty steel, and it is highly 300-400 millimeters that the wall thickness of upper chamber, which is 1-2 millimeters, and it is 20 lis that at top, integral type, which is provided with length,
Rice, the stainless steel connecting tube that diameter is 50-75 millimeters, stainless steel upper end of connecting tube installation locking connector.
6. cross-shaped dry-chemical fire extinguishing cover system according to claim 5, which is characterized in that the upper chamber of distributor
Shape be cylindrical or inverted round table shape, if upper chamber is cylindrical body, interior diameter is 150-200 millimeters.
7. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that dry powder extinguisher storage is held
Device top is equipped with charging hopper.
8. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that four dispatching pipe ends are enclosed
Concentric diameter of a circle is 3-6 meters.
9. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that the diameter of metal reinforcing
It is 25-30 millimeters.
10. cross-shaped dry-chemical fire extinguishing cover system according to claim 1, which is characterized in that locked engagement device is gold
Belong to fire-fighting connector, diameter is 50-75 millimeters, and wall thickness is 1-2 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611164201.0A CN106581909B (en) | 2016-12-16 | 2016-12-16 | Cross-shaped dry-chemical fire extinguishing cover system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611164201.0A CN106581909B (en) | 2016-12-16 | 2016-12-16 | Cross-shaped dry-chemical fire extinguishing cover system |
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| Publication Number | Publication Date |
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| CN106581909A CN106581909A (en) | 2017-04-26 |
| CN106581909B true CN106581909B (en) | 2019-05-14 |
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| CN201611164201.0A Active CN106581909B (en) | 2016-12-16 | 2016-12-16 | Cross-shaped dry-chemical fire extinguishing cover system |
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| CN108887305A (en) * | 2018-09-18 | 2018-11-27 | 广州酒家集团利口福食品有限公司 | A kind of intelligent robot on Production of Moon Cake line |
| CN110170127B (en) * | 2019-06-12 | 2024-03-29 | 湖北及安盾消防科技有限公司 | Microminiature fire extinguishing device with rechargeable battery pack and fire extinguishing method thereof |
| KR102154441B1 (en) * | 2019-09-17 | 2020-09-09 | 고정근 | fireextinguisher |
| CN111089682B (en) * | 2020-01-10 | 2021-11-02 | 国网新疆电力有限公司乌鲁木齐供电公司 | Oil leakage detection method for oil-immersed transformer |
| CN111803823B (en) * | 2020-06-30 | 2021-08-20 | 郑州航空工业管理学院 | Fire extinguishing system and fire extinguishing method thereof |
| CN113476770B (en) * | 2021-09-07 | 2021-11-05 | 江苏士美机电装备有限公司 | Fire extinguishing device with isolation function for fire-fighting task |
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| US3837405A (en) * | 1973-05-11 | 1974-09-24 | Tension Structures Co | Fire protection system for arch supported membrane structures |
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Also Published As
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| CN106581909A (en) | 2017-04-26 |
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