CN210179308U - Nitrogen filling device for preparing disinfection aerosol - Google Patents
Nitrogen filling device for preparing disinfection aerosol Download PDFInfo
- Publication number
- CN210179308U CN210179308U CN201920915484.0U CN201920915484U CN210179308U CN 210179308 U CN210179308 U CN 210179308U CN 201920915484 U CN201920915484 U CN 201920915484U CN 210179308 U CN210179308 U CN 210179308U
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- Prior art keywords
- nitrogen
- filling
- gas
- gas transmission
- boss
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 56
- 239000000443 aerosol Substances 0.000 title claims abstract description 19
- 238000004659 sterilization and disinfection Methods 0.000 title claims description 6
- 239000007789 gas Substances 0.000 claims abstract description 64
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 21
- 230000001954 sterilising effect Effects 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 230000008054 signal transmission Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims 1
- 238000005429 filling process Methods 0.000 abstract description 7
- 239000003380 propellant Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000012855 volatile organic compound Substances 0.000 description 8
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 238000005381 potential energy Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000001273 butane Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 239000004155 Chlorine dioxide Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 235000019398 chlorine dioxide Nutrition 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
A nitrogen filling device made of a sterilizing aerosol comprises a nitrogen tank, a compressor, a high-pressure tank, a gas pipe, a control valve, a flowmeter, a filling nozzle, a boss, a connecting table, a first mounting table, a second mounting table, a fixed table, a movable column, an elastic piece and a controller; the nitrogen tank, the compressor and the high-pressure tank are sequentially connected; the high-pressure tank is connected with the filling nozzle through a gas transmission pipe; the control valve and the flow meter are sequentially arranged on the gas transmission pipe; the filling nozzle is internally provided with a gas transmission channel and a gas outlet communicated with the gas transmission channel; the connecting table is arranged on the peripheral surface of the boss; the movable column is connected with the fixed table in a sliding manner; a second air delivery hole is formed in the fixed table; the gas transmission channel, the gas outlet, the first gas transmission hole and the second gas transmission hole form a nitrogen filling channel; the relative positions of the connecting table and the second mounting table are adjusted to control the connection and the closing of the nitrogen filling channel. The utility model discloses make the nitrogen gas filling process real-time controllable, ability accurate control nitrogen gas filling volume.
Description
Technical Field
The utility model relates to a gaseous filling device technical field especially relates to a nitrogen gas filling device of disinfection aerosol system.
Background
The aerosol is a preparation which is packaged in a pressure-resistant tank with a valve together with a propellant and is sprayed in a mist form when in use. The ejected micro-mist particles are called aerosol. The propellant in the existing aerosol generally selects dimethyl ether, propane and butane or hydrofluorocarbon Freon and other materials, but the materials are Volatile Organic Compounds (VOCs) with high Global Warming Potential (GWP), and the greenhouse effect is aggravated by using a large amount of the materials.
Therefore, it is necessary to select a propellant which is more environmentally friendly and to develop a filling apparatus for the propellant so as to fill the propellant into the aerosol can.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
For the technical problem who exists among the solution background art, the utility model provides a nitrogen gas filling device of disinfection aerosol system, nitrogen gas filling process is real-time controllable, can the accurate control nitrogen gas filling volume to compressed nitrogen gas is as propellant, environmental protection more.
(II) technical scheme
In order to solve the problems, the utility model provides a nitrogen filling device made of a disinfection aerosol, which comprises a nitrogen tank, a compressor, a high-pressure tank, a gas pipe, a control valve, a flowmeter, a filling nozzle, a boss, a connecting table, a first mounting table, a second mounting table, a fixed table, a movable column, an elastic part and a controller;
the nitrogen tank, the compressor and the high-pressure tank are sequentially connected; the high-pressure tank is connected with the filling nozzle through a gas transmission pipe; the control valve and the flow meter are sequentially arranged on the gas transmission pipe; the filling nozzle is internally provided with a gas transmission channel and a gas outlet communicated with the gas transmission channel; the connecting table, the first mounting table and the second mounting table are all of annular structures; the second mounting table is arranged at the bottom of the first mounting table; the connecting table is arranged on the peripheral surface of the boss; the movable column is vertically arranged at the bottom of the boss and is in sliding connection with the fixed table; a second air delivery hole is formed in the fixed table; the elastic piece is vertically arranged between the boss and the fixed table, the top of the elastic piece is connected with the boss, and the bottom of the elastic piece is connected with the fixed table; the gas transmission channel, the gas outlet, the first gas transmission hole and the second gas transmission hole form a nitrogen filling channel; the connection and the closing of the nitrogen filling channel are controlled by adjusting the relative positions of the connecting table and the second mounting table; the flowmeter is in communication connection with the controller; the controller is connected with the control valve.
Preferably, the outer peripheral surface of the filling nozzle is provided with a limit table; the filling nozzle and the limiting table are both connected with reinforcing rib plates.
Preferably, a first sealing ring is arranged at the bottom of the first mounting table; the top of the connecting table is provided with a second sealing ring.
Preferably, a cushion pad is arranged on the connecting table; the cushion is located between the connection station and the second mounting station.
Preferably, the bottom of the filling nozzle is connected with a positioning table; the positioning table is in a round table structure, and the diameter of the positioning table is gradually reduced from top to bottom; the top of the boss is provided with a groove matched with the positioning table.
Preferably, the elastic member is a compression spring.
Preferably, the controller is in communication connection with a signal transmission device; the signal transmission device is in communication connection with a display device.
The above technical scheme of the utility model has following profitable technological effect: the compressor pressurizes nitrogen delivered from the nitrogen tank, the pressurized nitrogen is delivered to the high-pressure tank to be stored, when the nitrogen needs to be filled into the spraying tank body from the high-pressure tank, the filling nozzle moves downwards, the filling nozzle pushes the boss to move downwards, the connecting table moves downwards along with the boss, the second mounting table is removed from plugging the first gas transmission hole, and the nitrogen filling channel consisting of the gas transmission channel, the gas outlet hole, the first gas transmission hole and the second gas transmission hole is communicated. And opening the control valve, enabling the nitrogen to flow from the high-pressure tank to the filling nozzle through the gas transmission pipe, enabling the nitrogen to sequentially pass through the gas transmission channel, the gas outlet hole, the first gas transmission hole and the second gas transmission hole, and enabling the nitrogen to enter the spraying tank body to perform nitrogen filling operation. The nitrogen filling process comprises the following steps: the nitrogen filling channel is communicated firstly, then the compressed nitrogen is conveyed, the nitrogen filling amount is obtained through the flowmeter, the control valve is closed when the filling standard is reached, the filling nozzle is pulled out, the nitrogen filling process is controllable in real time, and the nitrogen filling amount can be accurately controlled.
When the material is filled in the tank body of the spray tank, the material body and the propellant are completely isolated by a filling mode under the cover based on a Bag-on-valve (BOV) storage mode. The material body is stored in the valve bag, and propellant-compressed nitrogen (0.6-0.9 MPa) is stored in the compartment of the tank body, so that the influence of factors such as illumination, oxygen and the like on chlorine dioxide can be effectively isolated. Compressed nitrogen is adopted as a propellant to replace conventional Volatile Organic Compounds (VOCs) with high Global Warming Potential (GWP) such as dimethyl ether, propane, butane, hydrofluorocarbon Freon and the like, and the technical support and the practical popularization and application can be provided for the emission reduction of greenhouse gases and VOCs.
Drawings
Fig. 1 is a schematic structural view of a nitrogen gas filling device for producing a sterilizing aerosol according to the present invention.
Fig. 2 is an enlarged view of a structure at a in fig. 1.
Fig. 3 is a schematic structural view of a control principle of the nitrogen filling device made of the sterilizing aerosol according to the present invention.
Reference numerals: 100. a spray can body; 1000. an inflation hole; 1. a nitrogen tank; 2. a compressor; 3. a high-pressure tank; 4. a gas delivery pipe; 5. a control valve; 6. a flow meter; 7. a filling nozzle; 71. a gas transmission channel; 72. an air outlet; 8. a boss; 9. a connecting table; 91. a first gas transmission hole; 10. a first mounting table; 11. a second mounting table; 12. a fixed table; 121. a second gas transmission hole; 13. moving the column; 14. an elastic member; 15. a limiting table; 16. reinforcing rib plates; 17. a first seal ring; 18. a second seal ring; 19. a cushion pad; 20. a controller; 21. a signal transmission device; 22. a positioning table; 23. a display device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-3, the utility model provides a nitrogen gas filling device made of a sterilizing aerosol, which comprises a nitrogen gas tank 1, a compressor 2, a high-pressure tank 3, a gas pipe 4, a control valve 5, a flowmeter 6, a filling nozzle 7, a boss 8, a connecting table 9, a first mounting table 10, a second mounting table 11, a fixed table 12, a movable column 13, an elastic component 14 and a controller 20;
the nitrogen tank 1, the compressor 2 and the high-pressure tank 3 are connected in sequence; the high-pressure tank 3 is connected with a filling nozzle 7 through a gas transmission pipe 4; the control valve 5 and the flow meter 6 are sequentially arranged on the gas transmission pipe 4; the filling nozzle 7 is internally provided with a gas transmission channel 71 and a gas outlet 72 communicated with the gas transmission channel 71; the connecting table 9, the first mounting table 10 and the second mounting table 11 are all of annular structures; the second mounting table 11 is arranged at the bottom of the first mounting table 10; the connecting platform 9 is arranged on the peripheral surface of the boss 8; the movable column 13 is vertically arranged at the bottom of the boss 8, and the movable column 13 is connected with the fixed table 12 in a sliding manner; the fixed table 12 is provided with a second air delivery hole 121; the elastic piece 14 is vertically arranged between the boss 8 and the fixed table 12, the top of the elastic piece 14 is connected with the boss 8, and the bottom of the elastic piece 14 is connected with the fixed table 12; the gas transmission channel 71, the gas outlet 72, the first gas transmission hole 91 and the second gas transmission hole 121 form a nitrogen filling channel; the relative positions of the connecting table 9 and the second mounting table 11 are adjusted to control the connection and the closing of the nitrogen filling channel; the flowmeter 6 is in communication connection with the controller 20; the controller 20 is in control connection with the control valve 5.
The utility model discloses in, compressor 2 will follow the nitrogen gas pressurization that nitrogen gas jar 1 carried, and store in carrying the nitrogen gas after the pressurization to pressure vessel 3, when needs follow pressure vessel 3 to the inside nitrogen gas that fills of the spraying tank jar body 100, will fill nozzle 7 downstream, it promotes boss 8 downstream to fill nozzle 7, connect platform 9 along with boss 8 downstream, connect platform 9 to remove the shutoff of second mount table 11 to first gas transmission hole 91, by gas transmission channel 71, venthole 72, the nitrogen gas that first gas transmission hole 91 and second gas transmission hole 121 are constituteed fills the passageway and can communicate. And opening the control valve 5, enabling the nitrogen to flow from the high-pressure tank 3 to the filling nozzle 7 through the gas pipe 4, enabling the nitrogen to sequentially pass through the gas transmission channel 71, the gas outlet 72, the first gas transmission hole 91 and the second gas transmission hole 121, and enter the spraying tank body 100 to perform nitrogen filling operation. The nitrogen filling process comprises the following steps: the nitrogen filling channel is communicated firstly, then the compressed nitrogen is conveyed, the nitrogen filling amount is obtained through the flowmeter 6, the control valve 5 is closed when the filling standard is reached, the filling nozzle 7 is pulled out, the nitrogen filling process is controllable in real time, and the nitrogen filling amount can be accurately controlled.
When the spray can body 100 is filled with a material, the material body and the propellant are completely isolated by a filling mode under the cover based on a Bag-on-valve (BOV) storage mode. The material body is stored in the valve bag, and propellant-compressed nitrogen (0.6-0.9 MPa) is stored in the compartment of the tank body, so that the influence of factors such as illumination, oxygen and the like on chlorine dioxide can be effectively isolated. Compressed nitrogen is adopted as a propellant to replace conventional Volatile Organic Compounds (VOCs) with high Global Warming Potential (GWP) such as dimethyl ether, propane, butane, hydrofluorocarbon Freon and the like, and the technical support and the practical popularization and application can be provided for the emission reduction of greenhouse gases and VOCs.
The first installation stage 10 is disposed at an inlet of the air charging hole 1000, and the fixing stage 12 is horizontally disposed on an inner wall of the air charging hole 1000.
In an alternative embodiment, the filling nozzle 7 is provided with a limit table 15 on its outer circumferential surface; the filling nozzle 7 and the limiting platform 15 are both connected with a reinforcing rib plate 16.
It should be noted that the limiting table 15 is used for limiting the downward movement distance of the filling nozzle 7, the filling nozzle 7 moves downward, the boss 8 is pressed, the boss 8 and the connecting table 9 move downward, the first air delivery hole 91 on the connecting table 9 is communicated with the air outlet hole 72 on the filling nozzle 7, at this time, the limiting table 15 reaches the upper surface of the first mounting table 10, and the filling nozzle 7 reaches the downward movement limiting position; the reinforcing rib plate 16 is used for reinforcing the structural strength of the connection structure of the filling nozzle 7 and the limiting table 15.
In an alternative embodiment, the bottom of the first mounting stage 10 is provided with a first sealing ring 17; the top of the connecting table 9 is provided with a second sealing ring 18.
It should be noted that, when nitrogen gas filling operation is not performed, the upper surface of the first seal ring 17 is connected with the first mounting table 10, the lower surface of the first seal ring 17 is pressed against the upper surface of the boss 8, the lower surface of the second seal ring 18 is connected with the boss 8, the upper surface of the second seal ring 18 is pressed against the second mounting table 11, and the first seal ring 17 and the second seal ring 18 work together to effectively prevent nitrogen gas from flowing out from the first gas transmission hole 91 to the outside, thereby ensuring good sealing performance.
In an alternative embodiment, a cushion pad 19 is provided on the connection station 9; the cushion pad 19 is located between the connection station 9 and the second mounting station 11.
It should be noted that, because the elastic member 14 is compressed, elastic potential energy is stored in the elastic member 14, after the nitrogen gas filling operation is completed, the filling nozzle 7 moves upwards, the elastic member 14 releases the elastic potential energy, the boss 8 and the connecting platform 9 move upwards under the action of the elastic member 14 until the connecting platform 9 moves to the lower surface of the second mounting platform 11, and the cushion pad 19 is used for buffering the collision of the connecting platform 9 on the second mounting platform 11.
In an alternative embodiment, a positioning table 22 is attached to the bottom of the filling nozzle 7; the positioning table 22 is in a circular truncated cone structure, and the diameter of the positioning table is gradually reduced from top to bottom; the top of the boss 8 is provided with a groove matched with the positioning table 22.
It should be noted that, when the filling nozzle 7 moves downward, the positioning table 22 contacts with the boss 8 first, the positioning table 22 enters the groove on the boss 8, the position of the positioning table 22 is determined, the filling nozzle 7 can move downward along the vertical direction, the moving direction is more accurate, the nitrogen filling process is more stable, and the nitrogen filling effect of the filling device is better.
In an alternative embodiment, the resilient member 14 is a compression spring.
It should be noted that the compression spring has good expansion performance and long service life, the elastic member 14 stores elastic potential energy when compressed, and the elastic member 14 pushes the boss 8 and the connecting platform 9 to move upwards when releasing the elastic potential energy.
In an alternative embodiment, the controller 20 is communicatively connected to a signal transmission device 21; the signal transmission device 21 is communicatively connected with a display device 23.
It should be noted that the flow meter 6 is used for measuring the flow rate of the filled nitrogen gas, the flow meter 6 transmits flow rate data to the controller 20, and the controller 20 transmits the flow rate data to the display device 23 through the signal transmission device 21 so as to visually display the flow rate data on the display device 23.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. A nitrogen filling device made of a disinfection aerosol is characterized by comprising a nitrogen tank (1), a compressor (2), a high-pressure tank (3), a gas conveying pipe (4), a control valve (5), a flow meter (6), a filling nozzle (7), a boss (8), a connecting table (9), a first mounting table (10), a second mounting table (11), a fixed table (12), a moving column (13), an elastic piece (14) and a controller (20);
the nitrogen tank (1), the compressor (2) and the high-pressure tank (3) are connected in sequence; the high-pressure tank (3) is connected with the filling nozzle (7) through a gas transmission pipe (4); the control valve (5) and the flow meter (6) are sequentially arranged on the gas transmission pipe (4); the filling nozzle (7) is internally provided with a gas transmission channel (71) and a gas outlet hole (72) communicated with the gas transmission channel (71); the connecting table (9), the first mounting table (10) and the second mounting table (11) are all of annular structures; the second mounting table (11) is arranged at the bottom of the first mounting table (10); the connecting platform (9) is arranged on the peripheral surface of the boss (8); the movable column (13) is vertically arranged at the bottom of the boss (8), and the movable column (13) is connected with the fixed platform (12) in a sliding manner; a second air delivery hole (121) is arranged on the fixed table (12); the elastic piece (14) is vertically arranged between the boss (8) and the fixed platform (12), the top of the elastic piece (14) is connected with the boss (8), and the bottom of the elastic piece is connected with the fixed platform (12); the gas transmission channel (71), the gas outlet hole (72), the first gas transmission hole (91) and the second gas transmission hole (121) form a nitrogen filling channel; the communication and the closing of the nitrogen filling channel are controlled by adjusting the relative positions of the connecting table (9) and the second mounting table (11); the flowmeter (6) is in communication connection with the controller (20); the controller (20) is in control connection with the control valve (5).
2. A nitrogen gas filling device made of a sterilizing aerosol according to claim 1, wherein a stopper table (15) is provided on an outer peripheral surface of the filling nozzle (7); the filling nozzle (7) and the limiting platform (15) are both connected with reinforcing rib plates (16).
3. A sterilizing aerosol nitrogen filling apparatus according to claim 1, wherein the first mounting table (10) is provided at a bottom thereof with a first packing (17); the top of the connecting table (9) is provided with a second sealing ring (18).
4. A sterile aerosol nitrogen filling apparatus as claimed in claim 1, wherein the connecting table (9) is provided with a cushion pad (19); the cushion pad (19) is located between the connecting table (9) and the second mounting table (11).
5. A sterilizing aerosol-made nitrogen gas filling device according to claim 1, wherein a positioning table (22) is attached to a bottom of the filling nozzle (7); the positioning table (22) is in a round table structure, and the diameter of the positioning table is gradually reduced from top to bottom; the top of the boss (8) is provided with a groove matched with the positioning table (22).
6. A nitrogen filling device for a sterilizing aerosol according to claim 1, wherein the elastic member (14) is a compression spring.
7. A nitrogen filling device for a sterilizing aerosol according to claim 1, wherein the controller (20) is communicatively connected with a signal transmission device (21); the signal transmission device (21) is in communication connection with a display device (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920915484.0U CN210179308U (en) | 2019-06-18 | 2019-06-18 | Nitrogen filling device for preparing disinfection aerosol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920915484.0U CN210179308U (en) | 2019-06-18 | 2019-06-18 | Nitrogen filling device for preparing disinfection aerosol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210179308U true CN210179308U (en) | 2020-03-24 |
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ID=69837952
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920915484.0U Expired - Fee Related CN210179308U (en) | 2019-06-18 | 2019-06-18 | Nitrogen filling device for preparing disinfection aerosol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210179308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131577A (en) * | 2019-06-18 | 2019-08-16 | 电子科技大学中山学院 | Nitrogen filling device for preparing disinfection aerosol |
-
2019
- 2019-06-18 CN CN201920915484.0U patent/CN210179308U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131577A (en) * | 2019-06-18 | 2019-08-16 | 电子科技大学中山学院 | Nitrogen filling device for preparing disinfection aerosol |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200324 Termination date: 20210618 |
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| CF01 | Termination of patent right due to non-payment of annual fee |