CN211903137U - Air purification and disinfection system - Google Patents
Air purification and disinfection system Download PDFInfo
- Publication number
- CN211903137U CN211903137U CN202020271986.7U CN202020271986U CN211903137U CN 211903137 U CN211903137 U CN 211903137U CN 202020271986 U CN202020271986 U CN 202020271986U CN 211903137 U CN211903137 U CN 211903137U
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- air
- chlorine dioxide
- unit
- filtering
- disinfection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The utility model provides an air purification and disinfection system, which comprises an air inlet unit, a filtering unit for filtering and purifying air and an air supply unit; the slow-release solid chlorine dioxide disinfection unit is used for slowly releasing chlorine dioxide gas and sterilizing air entering through the air supply unit; the control unit is used for controlling the air supply quantity of the air supply unit; the air supply unit is used for supplying purified and sterilized pure air to the environment. The utility model discloses an air purification disinfection system, it utilizes slowly-releasing solid chlorine dioxide disinfection unit to become chlorine dioxide by solid-state slowly-releasing gaseous, utilizes chlorine dioxide gas to disinfect the air, still can contain chlorine dioxide gas in the pure gas that enables the air supply unit to send out simultaneously, carries out the sterilization effectively continuously to the environment.
Description
Technical Field
The utility model relates to an air purification technical field, concretely relates to can purify and effectively disinfect air purification disinfection system to the air simultaneously.
Background
With the development of industrial economy, the emission of various industrial waste gases has seriously affected the air quality. With the improvement of the quality of life and the stricter requirements on the gas environment treatment, people pay more and more attention to the indoor air purification treatment of air, especially in home or business travel places and other places with dense people flow.
Therefore, in more and more household and public indoor places, people mostly adopt the air freshener, and the odor is covered by the fragrance emitted by the air freshener, so that the air can be purified, but the bacteria in the air cannot be killed; or the air purification system is selected to filter the air, so that various air pollutants (generally including PM2.5, dust, pollen, peculiar smell, decoration pollution such as formaldehyde, bacteria, allergen and the like) can be decomposed or converted, the air cleanliness is effectively improved, but the air purification system only has a physical filtering effect on the air and cannot kill viruses or other pathogenic microorganisms in the air.
It is worth noting that the existing air purification system mainly adopts an air purifier, which filters and purifies air through a filter assembly (also called a filter element generally), but the filter element needs to be replaced regularly, if the filter element is not replaced timely, harmful substances contained in the residual adsorbed air are easily caused to become secondary pollution sources of indoor air, the filter element is not filtered, but becomes a place for storing and containing dirt, however, the filter element replacement cost is high, and the air purification system is difficult to consume or popularize for common household places. Meanwhile, in places with dense pedestrian flows, such as hotels, shopping malls, stations and the like, the indoor air is difficult to be purified and even disinfected in an all-round and continuous and effective manner due to large building area.
SUMMERY OF THE UTILITY MODEL
To the prior art, the utility model provides a sustainable air purification disinfection system that purifies and disinfect to air, but this air purification disinfection system adopts the gaseous slowly-releasing solid chlorine dioxide disinfection unit of slowly-releasing high-purity chlorine dioxide, can also disinfect the disinfection to the air in air-purifying, make simultaneously contain high-purity chlorine dioxide gas in the pure air after air purification system releases, disinfect the disinfection simultaneously to the environment, this system especially can be applied to the intensive place of stream of people such as hotel, market, station.
Specifically, the air purification and disinfection system provided by the utility model comprises an air inlet unit, a filtering unit for filtering and purifying air and an air supply unit;
the slow-release solid chlorine dioxide disinfection unit is used for slowly releasing chlorine dioxide gas and sterilizing air entering through the air supply unit;
the control unit is used for controlling the air supply quantity of the air supply unit;
the air supply unit is used for supplying purified and sterilized pure air to the environment.
The utility model discloses an air purification disinfection system, it utilizes slowly-releasing solid chlorine dioxide disinfection unit to become chlorine dioxide by solid-state slowly-releasing gaseous, utilizes chlorine dioxide gas to disinfect the air, still can contain chlorine dioxide gas in the pure gas that enables the air supply unit to send out simultaneously, carries out the sterilization effectively continuously to the environment.
Furthermore, the slow-release solid chlorine dioxide disinfection unit comprises a slow-release base layer and a solid chlorine dioxide preparation layer, wherein the solid chlorine dioxide preparation layer comprises a plurality of slow-release solid chlorine dioxide particles arranged on the slow-release base layer.
After the slow-release solid chlorine dioxide particles are dissolved in water, the chlorine dioxide content of the slow-release solid chlorine dioxide particles is 2-6mg/L of water.
Furthermore, a plurality of through cavities are arranged on the slow release base layer, and the slow release type solid chlorine dioxide particles are contained in the through cavities.
Further, the slow-release solid chlorine dioxide preparation is a spherical slow-release solid chlorine dioxide preparation or a columnar slow-release solid chlorine dioxide preparation.
The spherical slow-release solid chlorine dioxide preparation can be stacked in the through cavity, and the chlorine dioxide gas is easy to release due to the uniform gaps among the spherical surfaces.
The columnar slow-release solid chlorine dioxide preparation has high chlorine dioxide gas release speed and low production and manufacturing cost.
The utility model discloses a slow-release solid chlorine dioxide preparation, its chlorine dioxide content is 2-6mg/L water after dissolving in water.
Furthermore, at least one side of the through cavity is provided with a packaging layer.
Further, the packaging layer is a filtering packaging layer.
Preferably, the filtering and packaging layers are arranged on two sides of the through cavity, so that the slow-release solid chlorine dioxide preparation can be prevented from sliding out of the through cavity, and air can be purified.
Furthermore, the filtering and packaging layer comprises more than one of an active carbon filtering layer, a nano filtering layer, a non-woven fabric folding filtering layer or a plasma disinfection layer.
The nano filter layer adopts a nano-grade adsorption mode to further filter harmful gases in the air, such as formaldehyde, benzene, VOC and other odor pollutants.
Particularly, the nano filter layer is a nano ore crystal filter layer, a nano silver filter layer, a nano titanium dioxide filter layer and the like.
The effective rate of the non-woven fabric folding filter layer for removing the particles with the diameters of 0.1 micron and 0.3 micron reaches 99.7 percent, and the effective rate of the non-woven fabric folding filter layer for removing the particles with the diameters of more than 0.3 micron (1/200 of the hair diameter) reaches more than 99.97 percent, so that pollutants such as smoke, dust, bacteria and the like can be effectively filtered.
When the specific filtering and packaging layer is actually selected, the quality of the gas in the space and the application occasion can be determined.
Preferably, at least one of the filtering and packaging layers respectively arranged at the two sides of the through cavity comprises an activated carbon filtering layer. Because the activated carbon filter layer can adsorb a certain amount of chlorine dioxide gas in the process of slowly releasing the chlorine dioxide gas, the activated carbon filter layer is passively adsorbed at the moment, and the slowly-releasing chlorine dioxide disinfection device can actively release the adsorbed chlorine dioxide gas under a certain pressure, such as wind pressure, so that more durable sterilization and disinfection can be realized.
As an embodiment, the slow release solid chlorine dioxide disinfection unit is disposed before the filtration unit.
As a second embodiment, the slow release solid chlorine dioxide disinfection unit is disposed after the filtration unit.
Further, the filter unit comprises a primary filter device for filtering PM2.5 particles and a secondary filter device for re-filtering the air.
Still further, the filter unit further comprises a third-stage filter device for further filtering particles, impurities and the like in the air.
As a third embodiment, the filtering unit comprises a primary filtering device and a secondary filtering device, the primary filtering device is used for coarsely filtering the air entering through the air inlet unit, and the secondary filtering device is used for re-filtering the coarsely filtered air and primarily filtering the air sterilized and disinfected through the slow-release solid chlorine dioxide disinfection unit.
Furthermore, the filtering unit further comprises a third-stage filtering device, and the third-stage filtering device can adopt a composite filtering structure of a non-woven fabric folding type filtering layer and a gas filtering membrane layer and is used for further purifying gas.
Particularly, the utility model provides an air purification disinfection system still include with the chlorine dioxide concentration on-line measuring appearance of the control unit control connection, chlorine dioxide concentration on-line measuring appearance is used for detecting the chlorine dioxide gas concentration of air supply unit air inlet side.
Furthermore, the air supply unit is connected with the air inlet unit through an air pipe so as to realize purified air circulation. The purified air contains chlorine dioxide gas with a certain content, and the chlorine dioxide gas circulates in the air purification and disinfection system, so that the air sterilization and disinfection effect can be improved, and the air purification degree can be improved.
The primary filter device may be a coarse mesh for filtering PM2.5 particles in the air, and the secondary filter device may be one or more of an activated carbon filter layer, a plasma sterilization layer, a nano filter layer, and a non-woven fabric folding filter layer, but is not limited thereto. The third-stage filtering device can be a compound of a non-woven fabric folding filtering layer and a gas filtering membrane.
Further, the utility model provides an air purification disinfection system still include with the chlorine dioxide concentration on-line measuring appearance of the control unit control connection, chlorine dioxide concentration on-line measuring appearance is used for detecting the chlorine dioxide gas concentration of air supply unit air inlet side. And a control circuit board of the control unit controls the air quantity of the air inlet unit and/or the air outlet unit according to the detection data fed back by the chlorine dioxide concentration online detector.
Specifically, the utility model provides an air inlet unit and air-out unit all can utilize fan business turn over wind.
The units of the air purification and disinfection system of the utility model can be located in one place, for example, integrated in a common casing, or not physically separated; and can be distributed at different positions in space according to the application environment.
Compared with the prior art, the utility model provides an air purification disinfection system has following advantage:
1) the slow-release solid chlorine dioxide disinfection unit is arranged to slowly release solid chlorine dioxide into gaseous chlorine dioxide to purify and disinfect air, and meanwhile, the slow-release chlorine dioxide gas can circulate to the environment along with pure air to sterilize and disinfect the environment;
2) the slow-release solid chlorine dioxide disinfection unit adopts a structure that a slow-release base layer contains slow-release solid chlorine dioxide particles, so that chlorine dioxide molecules are controllably converted from a solid state to a gas phase state at a constant speed and enter air to be disinfected, and sanitation dead corners such as corners in the environment can be disinfected in an all-around manner; the corrosion of metal parts in the machine body or the disinfection space caused by the spraying of chlorine dioxide solution is avoided, the damage to the objects in the disinfection space is avoided, compared with the sterilization effective period of only a few hours when gasified liquid chlorine dioxide is adopted in the lower purifier, the slow release period of the slow release solid chlorine dioxide disinfection unit can be as long as 30-40 days, and the time is even longer;
3) the control unit detects the content of the slow-release chlorine dioxide gas by using a chlorine dioxide concentration online detector and ensures the sterilization effect by controlling the air quantity of the system;
5) through the test, the utility model discloses an air purification disinfection system can purify and disinfect the air high efficiency, through the test, reaches 99.9% to natural bacteria sterilization rate in the air in 30 minutes, reaches more than 99.5% in 40 minutes to escherichia coli, staphylococcus aureus, candida albicans.
Drawings
FIG. 1 is a schematic view of an air purification and disinfection system according to embodiment 2 of the present invention;
FIG. 2 is a schematic view of the air purification and disinfection system of embodiment 3 of the present invention;
fig. 3 is a schematic view of a filtration unit module according to embodiments 1-3 of the present invention;
FIG. 4 is a schematic view of the filtration unit module mentioned in examples 1-3;
fig. 5 is a schematic structural view of the air flow direction in embodiment 3 of the present invention;
fig. 6 is a schematic structural diagram of the slow-release solid chlorine dioxide disinfection device mentioned in embodiments 1-3 of the present invention. Detailed Description
For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship, the description is only for convenience and simplicity based on the orientation or positional relationship shown in the drawings, and the description is not intended to indicate or imply that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
The utility model provides an air purification and disinfection system, which comprises an air inlet unit 1, a slow-release solid chlorine dioxide disinfection unit 3, a filtering unit 2 and an air supply unit 4 which are arranged in sequence, wherein the independent units can be connected in sequence through air pipes; the chlorine dioxide concentration online detection device is arranged on an air path between the filtering unit 2 and the air supply unit 4, and the control unit 5 is in control connection with the chlorine dioxide concentration online detection device and is also in control connection with the air inlet unit 1 and the air supply unit 4 so as to control the air inlet amount and the air outlet amount; the air outlet unit 4 sends a part of purified air after being purified, sterilized and disinfected to the environment, and a part of purified air is sent to the air supply unit 1 through the air pipe.
The utility model discloses an among the air purification disinfection system, chlorine dioxide gas is gone out in the 2 slowly-releasing of slowly-releasing solid chlorine dioxide disinfection unit, disinfects the disinfection to the air earlier, and the air after the disinfection of disinfecting is through the filtration unit purification back again via air supply unit part send to the environment, and the part is sent to air inlet unit 1 through the tuber pipe again, carries out air cycle.
Example 2
The utility model provides an air purification and disinfection system, which comprises an air inlet unit 1, a filtering unit 2, a slow-release solid chlorine dioxide disinfection unit 3 and an air supply unit 4 which are connected in turn through an air pipe, and a control unit 5 which is in control connection with the air inlet unit 1 and the air supply unit 4; the on-line chlorine dioxide concentration detector is arranged in the air paths of the slow-release solid chlorine dioxide disinfection unit 3 and the air supply unit 4, and the control unit 5 is in control connection with the air inlet unit 1 and the air supply unit 4 and is also in control connection with the on-line chlorine dioxide concentration detector; wherein, the air outlet unit 4 sends a part of purified and sterilized pure air to the environment, and a part of purified and sterilized pure air is sent to the air supply unit 1 through an independent air pipe.
The utility model discloses an among the air purification disinfection system, filtering unit 2 purifies the air that sends into via air inlet unit 1, then 2 slowly-releasing chlorine dioxide gas of slowly-releasing solid chlorine dioxide disinfection unit, the air after purifying disinfects the disinfection, still contain chlorine dioxide gas in purifying and disinfecting the sterile air, send to the environment via 4 parts of air supply unit in, can disinfect the environment, the part is sent to air inlet unit 1 via other independent tuber pipe again, cyclic utilization carries out.
Example 3
The utility model discloses an air purification disinfection system, including air inlet unit 1, filter unit 2, slowly-releasing solid chlorine dioxide disinfection unit 3 and air supply unit 4, and with air inlet unit 1 and 4 control connection's of air supply unit the control unit 5.
The air inlet unit 1 is respectively connected with the filtering unit 2 and the slow-release solid chlorine dioxide disinfection unit 3 through air pipes, the slow-release solid chlorine dioxide disinfection unit 3 is connected with the filtering unit 2, the slow-release solid chlorine dioxide disinfection unit 3 is connected with the air outlet unit 4 through the air pipes, the air purified by the filtering unit 2 and the air sterilized by the chlorine dioxide gas slowly released by the slow-release solid chlorine dioxide disinfection unit 3 are converged to the air supply unit 4 through the air outlet main pipe, and the chlorine dioxide concentration online detector in control connection with the control unit 5 is further arranged in the air path of the air outlet main pipe 4.
The control unit detects the content of the slow-release chlorine dioxide gas by using the chlorine dioxide concentration online detector and controls the air quantity of the system to ensure the sterilization and disinfection effects.
The structure of the filtering unit 2 mentioned in the foregoing embodiments 1 to 3 may be the same, and as illustrated in fig. 4, the filtering unit 2 includes a primary filtering device 21, a secondary filtering device 22, and a tertiary filtering device 23, which are sequentially arranged; the primary filter device 21 comprises a coarse screen and is mainly used for primarily filtering air to filter PM2.5 particles in the air, the secondary filter device 22 comprises an activated carbon filter layer and is mainly used for further adsorbing and purifying the air after coarse filtration, on the basis, the primary filter device can also comprise more than one of a plasma disinfection layer or a nano filter layer, the tertiary filter device comprises a non-woven fabric folding filter layer, the removal efficiency of the non-woven fabric folding filter layer is 99.7% for 0.1 micron and 0.3 micron, especially the removal efficiency of particles with the diameter of more than 0.3 micron (1/200 of the hair diameter) can be more than 99.97%, pollutants such as smoke, dust and bacteria are effectively filtered, on the basis, a layer of gas filter membrane can be compounded, and the gas filter membrane can finally purify the air.
In particular, the structure of the filtering unit 2 mentioned in embodiment 3 is the same as that of embodiments 1 and 2, but the connection relationship with the air path between the air intake unit 1 and the slow release solid chlorine dioxide disinfection unit 3 is slightly different, specifically, as shown in fig. 5, the primary filtering device 21 and the secondary filtering device 22 of the filtering unit 2 sequentially perform rough filtering and secondary filtering on the air, meanwhile, part of the air is directly sterilized and disinfected by the slow release solid chlorine dioxide disinfection unit 3, and then is filtered by the secondary filtering device 22, and the air purified by the secondary filtering device 22 is filtered again by the third filtering device, at this time, the air purity is higher, and after being sterilized and disinfected by the chlorine dioxide gas, the air still contains a certain amount of chlorine dioxide gas, and after being released into the air, the environment can be continuously sterilized and disinfected.
As shown in fig. 6, the sustained-release solid chlorine dioxide disinfection unit 3 mentioned in examples 1 to 3 comprises a sustained-release base layer 32 and a solid chlorine dioxide preparation layer 33, wherein the sustained-release base layer 32 has a plurality of through cavities, the solid chlorine dioxide preparation layer 33 comprises a plurality of columnar sustained-release solid chlorine dioxide particles accommodated in the through cavities, and the sustained-release solid chlorine dioxide disinfection device 3 further comprises encapsulation layers 31 arranged on two sides of the sustained-release base layer 32. Specifically, at least one of the two side sealing layers 31 includes an activated carbon layer, which can actively adsorb a certain amount of chlorine dioxide gas, and when the air pressure in the system reaches a certain degree, the adsorbed chlorine dioxide gas can be released into the air entering the air pipe.
The air purification and disinfection system provided by the utility model slowly releases solid chlorine dioxide into gaseous chlorine dioxide through the slow release of the solid chlorine dioxide for disinfection, so as to effectively sterilize and disinfect air, and the slow release period is as long as 30-40 days and even higher; and simultaneously, the utility model provides an air purification disinfection system collects air purification and disinfection in an organic whole that disinfects, can greatly improve the air quality, and the emergence of effective prevention respiratory disease especially can be applied to the air purification disinfection in large-scale indoor place.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (14)
1. The air purification and disinfection system is characterized by comprising an air inlet unit, a filtering unit for filtering and purifying air and an air supply unit;
the slow-release solid chlorine dioxide disinfection unit is used for slowly releasing chlorine dioxide gas and sterilizing air entering through the air supply unit;
the control unit is used for controlling the air supply quantity of the air supply unit;
the air supply unit is used for supplying purified and sterilized pure air to the environment.
2. The air purification and disinfection system of claim 1, wherein the slow-release solid chlorine dioxide disinfection unit comprises a slow-release base layer and a solid chlorine dioxide preparation layer, wherein the solid chlorine dioxide preparation layer comprises a plurality of slow-release solid chlorine dioxide particles arranged on the slow-release base layer.
3. The air purification and disinfection system of claim 2, wherein the slow release substrate is provided with a plurality of through cavities, and the slow release solid chlorine dioxide particles are contained in the through cavities.
4. The air purification and disinfection system of claim 3, wherein the slow release solid chlorine dioxide formulation is a spherical slow release solid chlorine dioxide formulation or a cylindrical slow release solid chlorine dioxide formulation.
5. An air cleaning and disinfecting system as claimed in claim 3 or 4, characterized in that the through-cavity is provided on at least one side with an encapsulating layer.
6. The air purification and disinfection system of claim 5, wherein the encapsulation layer is a filtration encapsulation layer.
7. The air purification and disinfection system of claim 6, wherein the filter encapsulation layer comprises one or more of an activated carbon filter layer, a nano filter layer, a non-woven fabric folded filter layer, or a plasma disinfection layer.
8. The air purification and disinfection system as claimed in claim 6 or 7, wherein said slow release solid chlorine dioxide disinfection unit is located before or after said filter unit.
9. The air purification and disinfection system of claim 8, wherein said filter unit comprises a primary filter means for filtering PM2.5 particles and a secondary filter means for re-filtering air.
10. The air purification and disinfection system of claim 9, wherein said filter unit further comprises a tertiary filtration device for further filtering PM2.5 particles in the air.
11. The air purification and sterilization system according to claim 6 or 7, wherein the filtering unit comprises a primary filtering device for coarse filtering the air entering through the air intake unit and a secondary filtering device for re-filtering the coarse filtered air and for primary filtering the air sterilized and sterilized through the slow release solid chlorine dioxide sterilization unit.
12. The air purification and disinfection system of claim 11, wherein the filter unit further comprises a tertiary filtration device for further filtering PM2.5 particles in the pre-filtered and re-filtered air.
13. The air purifying and sterilizing system of claim 10 or 12, further comprising an on-line chlorine dioxide concentration detector in control connection with the control unit, wherein the on-line chlorine dioxide concentration detector is used for detecting the concentration of chlorine dioxide gas on the air inlet side of the air supply unit.
14. The air purifying and sterilizing system of claim 13, wherein the air supply unit is connected with the air intake unit through an air pipe to realize purified air circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020271986.7U CN211903137U (en) | 2020-03-06 | 2020-03-06 | Air purification and disinfection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020271986.7U CN211903137U (en) | 2020-03-06 | 2020-03-06 | Air purification and disinfection system |
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| Publication Number | Publication Date |
|---|---|
| CN211903137U true CN211903137U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020271986.7U Expired - Fee Related CN211903137U (en) | 2020-03-06 | 2020-03-06 | Air purification and disinfection system |
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| CN (1) | CN211903137U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111237910A (en) * | 2020-03-06 | 2020-06-05 | 佛山市爱普克斯环保科技有限公司 | Air purification and disinfection system |
-
2020
- 2020-03-06 CN CN202020271986.7U patent/CN211903137U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111237910A (en) * | 2020-03-06 | 2020-06-05 | 佛山市爱普克斯环保科技有限公司 | Air purification and disinfection system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201110 Termination date: 20210306 |
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| CF01 | Termination of patent right due to non-payment of annual fee |