CN211273283U - Compressed air foam fire extinguishing device - Google Patents
Compressed air foam fire extinguishing device Download PDFInfo
- Publication number
- CN211273283U CN211273283U CN201922069958.7U CN201922069958U CN211273283U CN 211273283 U CN211273283 U CN 211273283U CN 201922069958 U CN201922069958 U CN 201922069958U CN 211273283 U CN211273283 U CN 211273283U
- Authority
- CN
- China
- Prior art keywords
- ball valve
- liquid
- gas
- valve
- foam
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The utility model discloses a compressed air foam extinguishing device, high-pressure tank link to each other with the gas-liquid mixer after through reducing valve, ball valve one, filter, gas flowmeter, check valve one, can carry out the malleation to the pipeline and aerify. The liquid-liquid mixer is connected with the gas-liquid mixer through the ball valve II and the check valve II, and liquid and gas are mixed in the gas-liquid mixer, so that a higher foam injection range is realized. The compressor is connected with the high-pressure tank, and can be inflated and pressurized without replacing the gas cylinder. The foam generator is connected with the gas-liquid mixer, the gas-liquid mixer prolongs gas-liquid contact time, and the foam generator can generate foam with fine structure and high stability. The first safety valve is connected with the high-pressure tank, and a branch pipeline is led out from the nine inlet of the ball valve and connected with the second safety valve, so that the pipeline blocked by impurities is prevented from being pressurized, and safety accidents are avoided. The device has the characteristics of positive pressure inflation, no need of replacing the gas cylinder, high firing range, high safety, uniform foam injection, high foam stability and fine foam structure.
Description
Technical Field
The utility model belongs to the technical field of the fire control is put out a fire, especially relates to a compressed air foam extinguishing device.
Background
Since the 21 st century, the development speed of socio-economic in China is faster and faster, the process of urbanization is accelerated, and buildings in cities are more and more highly dense. Meanwhile, the increase of the number of inflammable and explosive articles in the building and the diversification of the internal structure of the building increase the frequency of fire accidents. In addition, the characteristics of modern fires are very different from previous fires. From the scale of the fire, the modern fire is easier to spread due to the high size and the dense structure of the building, so that the scale of the fire is generally larger; from the complexity of the fire scene, the modern fire disaster usually occurs in the same time in various situations such as burning, explosion, casualty, poison and the like, and the fire scene situation changes all the time; from the perspective of fire objects and combustion forms, the fire objects are changed from single to multiple, and the forms are changed from one to multiple; from the aspect of rescue, the complex fire situation and the diversified fire situation bring more difficulties to the rescue of the fire fighters. The increasing number of fire accidents cause great loss of social property, threaten the personal safety of people and seriously affect the economic development and social harmony. In order to extinguish fire in time and reduce the loss caused by fire, the quality of the fire extinguishing performance of fire-fighting equipment is paid more and more attention. As one of the most widely used fire fighting equipments, the foam fire extinguishing device has a critical performance research and optimization.
At present, fire extinguishing equipment used in places such as petrochemical refining devices, gas stations, oil depots and the like usually adopts a negative pressure type foam fire extinguisher. The negative pressure type foam fire extinguisher is characterized in that high-speed fluid of foam mixed liquid forms negative pressure in a foam generator, and air is sucked into the foam mixed liquid from the outside by virtue of a Venturi effect. The foam generator is positioned at the tail end nozzle, the mixed liquid and the air are mainly mixed in a short spraying process, so that the formed bubbles are in a metastable state, the foam is not uniform, the foam layer is easy to break, and the stability is poor. Meanwhile, a part of fire extinguishing devices adopt the high-pressure gas cylinder to provide a gas source, and along with the service time and the shelf time are longer and longer, the pressure in the high-pressure gas cylinder is gradually reduced, and the high-pressure gas cylinder needs to be replaced to ensure the performance of the fire extinguishing device. The foam extinguishing agent is influenced by the lift of the high-pressure pump, has short spraying distance and is not suitable for long-distance fire.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims at providing a positive pressure is aerifyd, need not to change gas cylinder, range height, security height, foam spray even, foam stability is high, the fine and smooth compressed air foam extinguishing device of foam structure.
The utility model discloses set up the gas-liquid mixer, can carry out the malleation to the pipeline and aerify, can promote the foam because gas has higher pressure and sprays, and reduced at nozzle department gas pressure and promoted the velocity of flow greatly and realized higher foam injection range. Set up compressor and high-pressure tank, usable compressor aerifys it and steps up when the high-pressure tank internal pressure reduces, need not to change the gas cylinder, has saved manpower and fund. The foam and the high-pressure gas are fully mixed in the gas-liquid mixer, so that the gas-liquid contact time is ensured, and sufficient time is provided for generating foam with fine structure and high stability in the foam generator. The high-pressure gas is mixed with foam, and the volume of the gas is gradually increased after the gas is sprayed out from the nozzle, so that the foam can be uniformly dispersed, and the fire extinguishing device is favorable for uniformly covering fire to extinguish fire. And safety valves are arranged at the nozzle and on the high-pressure tank, so that safety accidents caused by the fact that the pipeline is blocked by impurities are prevented.
The utility model discloses specific technical scheme as follows:
a compressed air foam fire extinguishing device comprises a compressor, a high-pressure tank, a pressure sensor, a back pressure valve, a safety valve I, a pressure reducing valve, a ball valve I, a filter, a gas flow meter, a check valve I, a foam liquid storage tank, a ball valve II, a ball valve III, a centrifugal pump I, a ball valve IV, a liquid flow meter I, a water tank, a ball valve V, a ball valve VI, a centrifugal pump II, a ball valve VII, a liquid flow meter II, a liquid-liquid mixer, a ball valve VIII, a check valve II, a gas-liquid mixer, a foam generator, a check valve III, a ball valve IX, a safety valve II; the high-pressure tank is connected with the compressor; the pressure sensor is connected with the top of the high-pressure tank; the back pressure valve is connected with the top of the high-pressure tank; the first safety valve is connected with the top of the high-pressure tank; the pressure reducing valve is connected with the side surface of the high-pressure tank; the first ball valve is connected with the pressure reducing valve; the filter is connected with the first ball valve; the gas flowmeter is connected with the filter; the first check valve is connected with the gas flowmeter; the ball valve II is connected with the bottom of the foam liquid storage tank; a pipeline between the ball valve II and the foam liquid storage tank is connected with the ball valve III; the first centrifugal pump is connected with the third ball valve; the first liquid flow meter is connected with the first centrifugal pump; a pipeline between the first liquid flowmeter and the first centrifugal pump is connected with a fourth ball valve; the ball valve IV is connected with the side surface of the foam liquid storage tank; the ball valve V is connected with the bottom of the water tank; the pipeline between the ball valve five and the water tank is connected with the ball valve six; the centrifugal pump II is connected with the ball valve VI; the second liquid flow meter is connected with the second centrifugal pump; a pipeline between the second liquid flowmeter and the second centrifugal pump is connected with a ball valve seventh; the ball valve seventh is connected with the side surface of the water tank; the second check valve is connected with the eighth ball valve; the ball valve nine is connected with a check valve III; the nozzle is connected with the ball valve nine.
One end of the liquid-liquid mixer is connected with the first liquid flow meter, the other end of the liquid-liquid mixer is connected with the second liquid flow meter, and the other end of the liquid-liquid mixer is connected with the eighth ball valve.
And one end of the gas-liquid mixer is connected with the first check valve, the other end of the gas-liquid mixer is connected with the second check valve, and the other end of the gas-liquid mixer is connected with the foam generator.
And a branch pipeline is led out from the inlet of the ball valve nine and is connected with a safety valve II.
And the third check valve is connected with the foam generator.
Compared with the prior art, the invention has the following beneficial effects:
(1) set up the gas-liquid mixer, can carry out the malleation to the pipeline and aerify, because gaseous has higher pressure and can promote the foam injection, and gas pressure reduces and has promoted the velocity of flow greatly and realize higher foam injection range at nozzle department.
(2) Set up compressor and high-pressure tank, usable compressor aerifys it and steps up when the high-pressure tank internal pressure reduces, need not to change the gas cylinder, has saved manpower and fund.
(3) The foam and the high-pressure gas are fully mixed in the gas-liquid mixer, so that the gas-liquid contact time is ensured, and sufficient time is provided for generating foam with fine structure and high stability in the foam generator.
(4) The high-pressure gas is mixed with foam, and the volume of the gas is gradually increased after the gas is sprayed out from the nozzle, so that the foam can be uniformly dispersed, and the fire extinguishing device is favorable for uniformly covering fire to extinguish fire.
(5) And safety valves are arranged at the nozzle and on the high-pressure tank, so that safety accidents caused by the fact that the pipeline is blocked by impurities are prevented.
(6) The device has the characteristics of positive pressure inflation, no need of replacing the gas cylinder, high firing range, high safety, uniform foam injection, high foam stability and fine foam structure.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In fig. 1: 1-a compressor; 2-high pressure tank; 3-a pressure sensor; 4-back pressure valve; 5, a first safety valve; 6-a pressure reducing valve; 7-a ball valve I; 8-a filter; 9-a gas flow meter; 10-a check valve I; 11-a foam liquid storage tank; 12-ball valve two; 13-ball valve III; 14-a first centrifugal pump; 15-ball valve four; 16-a liquid flow meter I; 17-a water tank; 18-ball valve five; 19-ball valve six; 20-centrifugal pump II; 21-ball valve seven; 22-liquid flowmeter two; 23-liquid mixer; 24-ball valve eight; 25-check valve two; 26-gas-liquid mixer; 27-a foam generator; 28-check valve three; 29-ball valve nine; 30-safety valve II; 31-nozzle.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific embodiments. The following is a more detailed description of the present invention taken in conjunction with specific preferred embodiments, and it is not intended that the present invention be limited to the specific embodiments described herein. For those skilled in the art, without departing from the spirit of the present invention, several simple deductions or substitutions may be made, which should be considered as belonging to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a compressor 1, high-pressure tank 2, pressure sensor 3, back pressure valve 4, relief valve 5, pressure reducing valve 6, ball valve 7, filter 8, gas flowmeter 9, check valve 10, foam liquid storage tank 11, ball valve two 12, ball valve three 13, centrifugal pump 14, ball valve four 15, liquid flowmeter 16, water pitcher 17, ball valve five 18, ball valve six 19, centrifugal pump two 20, ball valve seven 21, liquid flowmeter two 22, liquid-liquid mixer 23, ball valve eight 24, check valve two 25, gas-liquid mixer 26, foam generator 27, check valve three 28, ball valve nine 29, relief valve two 30, nozzle 31. The high-pressure tank 2 is connected with the compressor 1, the compressor 1 can continuously provide high-pressure gas, and the high-pressure tank 2 is used for storing the high-pressure gas and keeping a certain pressure. The pressure sensor 3 is connected with the top of the high-pressure tank 2 and is used for displaying pressure change in the high-pressure tank 2. The back pressure valve 4 is connected with the top of the high-pressure tank 2, and the pressure in the high-pressure tank 2 can be adjusted to the required pressure by controlling the pressure value of the back pressure valve 4. The safety valve I5 is connected with the top of the high-pressure tank 2, and when the pressure in the high-pressure tank 2 is higher than the safety pressure, the safety valve I5 can be automatically opened to release the pressure. And the pressure reducing valve 6 is connected with the side surface of the high-pressure tank 2 and is used for controlling gas injection pressure. And the first ball valve 7 is connected with the pressure reducing valve 6 and is used for adjusting the gas injection flow. And the filter 8 is connected with the first ball valve 7 and is used for filtering impurities in the gas and preventing the pipeline from being blocked to damage equipment. The gas flow meter 9 is connected to the filter 8 for measuring the flow rate of the injected gas. The first check valve 10 is connected with the gas flow meter 9 and is used for preventing the fluid from flowing backwards. The second ball valve 12 is connected with the bottom of the foam concentrate storage tank 11 and can discharge waste liquid in the foam concentrate storage tank 11. And a pipeline between the second ball valve 12 and the foam concentrate storage tank 11 is connected with the third ball valve 13, so that the foam concentrate in the foam concentrate storage tank 11 can be guided to the inlet of the first centrifugal pump 14. The first centrifugal pump 14 is connected with the third ball valve 13 and is used for driving the foam liquid to flow. The first liquid flow meter 16 is connected with the first centrifugal pump 14 and is used for measuring the flow of the foam liquid and helping to control the mixing ratio of the foam liquid and the water. And a pipeline between the first liquid flow meter 16 and the first centrifugal pump 14 is connected with a fourth ball valve 15, so that part of foam concentrate can be drained back into the foam concentrate storage tank 11, and the flow of the foam concentrate can be controlled in an auxiliary manner. And the ball valve four 15 is connected with the side surface of the foam concentrate storage tank 11. The ball valve five 18 is connected with the bottom of the water tank 17 and can discharge waste liquid in the water tank 17. And a pipeline between the ball valve five 18 and the water tank 17 is connected with a ball valve six 19, so that water in the water tank 17 can be guided to an inlet position of the centrifugal pump two 20. The second centrifugal pump 20 is connected with the sixth ball valve 19 and is used for driving water to flow. And the second liquid flow meter 22 is connected with the second centrifugal pump 20 and is used for measuring the flow of water and helping to control the mixing ratio of the water and the foam liquid. And a pipeline between the second liquid flow meter 22 and the second centrifugal pump 20 is connected with a ball valve seventh 21, so that part of water can be drained back into the water tank 17, and the flow of the water can be controlled in an auxiliary manner. The ball valve seven 21 is connected with the side surface of the water tank 17. And one end of the liquid-liquid mixer 23 is connected with the first liquid flow meter 16, the other end of the liquid flow meter is connected with the second liquid flow meter 22, and the other end of the liquid flow meter is connected with the eighth ball valve 24, so that water and foam liquid can be mixed on line. The second check valve 25 is connected with the eighth ball valve 24 and is used for preventing the fluid from flowing backwards. And one end of the gas-liquid mixer 26 is connected with the first check valve 10, the other end of the gas-liquid mixer is connected with the second check valve 25, and the other end of the gas-liquid mixer is connected with the foam generator 27, so that high-pressure gas, water and foam liquid can be mixed on line. The foam generator 27 provides sufficient contact time for high-pressure gas, water and foam concentrate in combination with a long pipeline at the rear, so that the mixture can generate stable foam with a fine structure. The check valve III 28 is connected to the bubble generator 27 for preventing the reverse flow of the fluid. The ball valve nine 29 is connected to the check valve three 28 for controlling the flow of the foam injection. The nozzle 31 is connected to the ball valve nine 29 for ejecting gas and foam outwardly at a relatively high velocity. A branch pipeline is led out from an inlet of the ball valve nine 29 and is connected with a safety valve II 30, and when impurities block the pipeline to generate pressure build-up, the safety valve II 30 automatically opens to release pressure.
The specific operation process of the utility model is explained as follows:
all valves are closed. The compressor 1 is opened, the pressure value of the back pressure valve 4 is adjusted, and the high pressure tank 2 is filled with gas with a certain pressure. Setting the pressure of the pressure reducing valve 6, opening the ball valve I7, the ball valve III 13, the ball valve III 19, the ball valve I24 and the ball valve II 29, simultaneously controlling the opening degrees of the ball valve IV 15 and the ball valve VII 21 so as to adjust the flow of foam liquid and water, starting the centrifugal pump I14 and the centrifugal pump II 20, preliminarily mixing the foam liquid and the water in the liquid-liquid mixer 23, and then mixing the foam liquid and the water in the gas-liquid mixer 26 with high-pressure gas. The water, the foam liquid and the high-pressure gas are mixed in the gas-liquid mixer 26, enter the foam generator 27 to generate stable foam with fine structure, flow through a section of pipeline to be mutually contacted and mixed again to generate foam, and then are sprayed outwards from the nozzle 31.
In conclusion, the device is provided with the gas-liquid mixer, positive pressure inflation can be carried out on the pipeline, foam injection can be pushed due to the fact that gas has higher pressure, and the gas pressure at the nozzle is reduced, so that the flow speed is greatly improved, and the higher foam injection range is realized. Set up compressor and high-pressure tank, usable compressor aerifys it and steps up when the high-pressure tank internal pressure reduces, need not to change the gas cylinder, has saved manpower and fund. The foam and the high-pressure gas are fully mixed in the gas-liquid mixer, so that the gas-liquid contact time is ensured, and sufficient time is provided for generating foam with fine structure and high stability in the foam generator. The high-pressure gas is mixed with foam, and the volume of the gas is gradually increased after the gas is sprayed out from the nozzle, so that the foam can be uniformly dispersed, and the fire extinguishing device is favorable for uniformly covering fire to extinguish fire. And safety valves are arranged at the nozzle and on the high-pressure tank, so that safety accidents caused by the fact that the pipeline is blocked by impurities are prevented. The device has the characteristics of positive pressure inflation, no need of replacing the gas cylinder, high firing range, high safety, uniform foam injection, high foam stability and fine foam structure.
Claims (5)
1. A compressed air foam fire extinguishing device is characterized by comprising a compressor, a high-pressure tank, a pressure sensor, a back pressure valve, a safety valve I, a pressure reducing valve, a ball valve I, a filter, a gas flowmeter, a check valve I, a foam liquid storage tank, a ball valve II, a ball valve III, a centrifugal pump I, a ball valve IV, a liquid flowmeter I, a water tank, a ball valve V, a ball valve VI, a centrifugal pump II, a ball valve VII, a liquid flowmeter II, a liquid mixer, a ball valve VIII, a check valve II, a gas-liquid mixer, a foam generator, a check valve III, a ball valve VII, a safety valve II and a nozzle; the high-pressure tank is connected with the compressor; the pressure sensor is connected with the top of the high-pressure tank; the back pressure valve is connected with the top of the high-pressure tank; the first safety valve is connected with the top of the high-pressure tank; the pressure reducing valve is connected with the side surface of the high-pressure tank; the first ball valve is connected with the pressure reducing valve; the filter is connected with the first ball valve; the gas flowmeter is connected with the filter; the first check valve is connected with the gas flowmeter; the ball valve II is connected with the bottom of the foam liquid storage tank; a pipeline between the ball valve II and the foam liquid storage tank is connected with the ball valve III; the first centrifugal pump is connected with the third ball valve; the first liquid flow meter is connected with the first centrifugal pump; a pipeline between the first liquid flowmeter and the first centrifugal pump is connected with a fourth ball valve; the ball valve IV is connected with the side surface of the foam liquid storage tank; the ball valve V is connected with the bottom of the water tank; the pipeline between the ball valve five and the water tank is connected with the ball valve six; the centrifugal pump II is connected with the ball valve VI; the second liquid flow meter is connected with the second centrifugal pump; a pipeline between the second liquid flowmeter and the second centrifugal pump is connected with a ball valve seventh; the ball valve seventh is connected with the side surface of the water tank; the second check valve is connected with the eighth ball valve; the ball valve nine is connected with a check valve III; the nozzle is connected with the ball valve nine.
2. Compressed air foam fire extinguishing apparatus according to claim 1, wherein: one end of the liquid-liquid mixer is connected with the first liquid flow meter, the other end of the liquid-liquid mixer is connected with the second liquid flow meter, and the other end of the liquid-liquid mixer is connected with the eighth ball valve.
3. Compressed air foam fire extinguishing apparatus according to claim 1, wherein: and one end of the gas-liquid mixer is connected with the first check valve, the other end of the gas-liquid mixer is connected with the second check valve, and the other end of the gas-liquid mixer is connected with the foam generator.
4. Compressed air foam fire extinguishing apparatus according to claim 1, wherein: and a branch pipeline is led out from the inlet of the ball valve nine and is connected with a safety valve II.
5. Compressed air foam fire extinguishing apparatus according to claim 1, wherein: and the third check valve is connected with the foam generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922069958.7U CN211273283U (en) | 2019-11-25 | 2019-11-25 | Compressed air foam fire extinguishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922069958.7U CN211273283U (en) | 2019-11-25 | 2019-11-25 | Compressed air foam fire extinguishing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211273283U true CN211273283U (en) | 2020-08-18 |
Family
ID=72026410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922069958.7U Expired - Fee Related CN211273283U (en) | 2019-11-25 | 2019-11-25 | Compressed air foam fire extinguishing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211273283U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114404847A (en) * | 2021-12-27 | 2022-04-29 | 明光浩淼安防科技股份公司 | B-class air bubble foam high-spraying fire extinguishing device |
| CN114917514A (en) * | 2022-06-27 | 2022-08-19 | 上海华锐救援装备有限公司 | Metastable state active water efficient device for fire extinguishing and emergency treatment |
-
2019
- 2019-11-25 CN CN201922069958.7U patent/CN211273283U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114404847A (en) * | 2021-12-27 | 2022-04-29 | 明光浩淼安防科技股份公司 | B-class air bubble foam high-spraying fire extinguishing device |
| CN114917514A (en) * | 2022-06-27 | 2022-08-19 | 上海华锐救援装备有限公司 | Metastable state active water efficient device for fire extinguishing and emergency treatment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211273283U (en) | Compressed air foam fire extinguishing device | |
| RU2136339C1 (en) | Fire-fighting device | |
| CN202892720U (en) | Compressed air foam fire-extinguishing apparatus | |
| AU2015101100A4 (en) | One kind of long-distance high-lift mobile wildfire fighting platform for transmission lines | |
| CN103007472B (en) | Compressed air foam extinguishing agent ejecting gun and method thereof | |
| CN105749449B (en) | A kind of tunnel fire system and extinguishing method | |
| JPH09500043A (en) | Methods and equipment for fire extinguishing using a mixture of liquid mist and non-flammable gas | |
| CN1085949C (en) | A fire fighting installation for discharging a liquid-gas fog | |
| CN110548238A (en) | Fire extinguishing system and method adopting foam spray fire extinguishing and water spray continuous cooling | |
| CN203154684U (en) | Compressed gas foam extinguishing system for fire fighting truck | |
| CN102580275A (en) | Backpack effervescent atomization water mist fire extinguishing device | |
| CN211215075U (en) | Fire extinguishing system with foam spray fire extinguishing and water spray continuous cooling functions | |
| CN205549313U (en) | Portable large -traffic foam feeding device | |
| CN203090319U (en) | Multifunctional compressed air foam fire extinguishment device | |
| CN211188891U (en) | Fire engine with fire extinguishing device | |
| CN211273291U (en) | Superfine dry powder fire extinguishing device | |
| CN203677809U (en) | Vehicle-mounted adjustable high-pressure fine water mist foam fire extinguishing apparatus | |
| CN207640845U (en) | Vehicle-mounted foam fire-extinguishing gun | |
| CN110448838A (en) | Floating plate sealing ring extinguishing device and method | |
| CN209392636U (en) | A kind of high expansion foam fire-extinguishing system | |
| CN103949026A (en) | Water mist fire extinguishing system | |
| CN206867540U (en) | A kind of backpack is pre-mixed compressed air foam fire-extinguishing apparatus | |
| CN211215109U (en) | Fire engine loaded with three-phase jet fire extinguishing device | |
| CN205084257U (en) | Novel tank type fire engine | |
| CN2520183Y (en) | Spray automatic fireextinguishing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200818 Termination date: 20211125 |