CN212644889U - Indoor air purifying device - Google Patents
Indoor air purifying device Download PDFInfo
- Publication number
- CN212644889U CN212644889U CN202021125957.6U CN202021125957U CN212644889U CN 212644889 U CN212644889 U CN 212644889U CN 202021125957 U CN202021125957 U CN 202021125957U CN 212644889 U CN212644889 U CN 212644889U
- Authority
- CN
- China
- Prior art keywords
- indoor air
- air
- indoor
- ion
- generating device
- 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.)
- Active
Links
Images
Landscapes
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The utility model provides an indoor air purification device sets up in the circulation wind channel, and the circulation wind channel includes indoor return air end and indoor air supply end, and indoor air purification device includes: the ion generating device is arranged in the circulating air duct and is used for generating ions; when the ion generating device operates, the ion concentration in at least one section in the circulating air duct reaches or exceeds a first preset level, and ions generated by the ion generating device can flow out of the air supply outlet of the indoor air supply end to enter the room, so that the ion concentration in the room reaches or exceeds a second preset level.
Description
Technical Field
The utility model relates to an electrical apparatus field particularly, relates to an indoor air purification device.
Background
At present, the mainstream technology of indoor air purification is a filtering technology and an electrostatic adsorption technology. Wherein, both are passive purification technologies.
The air purification equipment adopting the filtering technology mostly uses HEPA filter screens, the filtering technology has the advantage of high purification efficiency, but the wind resistance is large, and a strong enough fan must be matched to drive air to flow through the filter screens, so that not only is the noise increased, but also the energy consumption is increased, the filter screens need to be frequently replaced, otherwise, not only the filtering efficiency can be reduced, the energy consumption can be increased, but also secondary pollution is easily caused.
Although the air purification equipment adopting the electrostatic adsorption technology has small wind resistance, the air purification equipment is not suitable for operating under the working condition of high wind speed, otherwise, the dust removal efficiency of the electrostatic dust removal device is rapidly reduced along with the increase of the wind speed. If the electrostatic dust removal device operates in a working condition with low wind speed, firstly, a large amount of ozone is generated due to high-pressure ionized air; secondly, the electrostatic dust removal device frequently and repeatedly generates 'pap' and 'pap' ignition noise in the operation process, and the user experience is poor along with 'blue light flashing'; and thirdly, the electrostatic dust collection is required to be cleaned regularly, special cleaning agents, hot water, ultrasonic waves, special tools and operations are required, the purification function can be lost when the electrostatic dust collection is not cleaned in time, time and labor are wasted, and the maintenance cost is high.
SUMMERY OF THE UTILITY MODEL
A primary object of the utility model is to provide an indoor air purification device to solve the poor problem of air purifier's among the prior art purifying effect.
In order to achieve the above object, the utility model provides an indoor air purification device sets up in the circulation wind channel, and the circulation wind channel includes indoor return air end and indoor air supply end, and indoor air purification device includes: the ion generating device is arranged in the circulating air duct and is used for generating ions; when the ion generating device operates, the ion concentration in at least one section in the circulating air duct reaches or exceeds a first preset level, and ions generated by the ion generating device can flow out of the air supply outlet of the indoor air supply end to enter the room, so that the ion concentration in the room reaches or exceeds a second preset level.
Furthermore, the ion generating device is arranged at an air supply opening of the indoor air supply end.
Further, the ion generating device includes: the shell comprises an air inlet end and an air outlet end; an ultraviolet light source disposed within the housing; the photocatalytic medium is arranged in the shell, when the ultraviolet light source operates, light rays emitted by the ultraviolet light source irradiate the photocatalytic medium, and then air in the shell is subjected to photocatalytic reaction to generate ions.
Furthermore, the photocatalytic medium is barrel-shaped, a plurality of through holes are formed in the barrel wall of the photocatalytic medium, and the ultraviolet light source is arranged in the photocatalytic medium.
Further, the surface of the photocatalytic medium is undulated in the circumferential direction.
Furthermore, the air purification device also comprises a needle point device, an electronic drainage part and an ion power supply device; the ion power supply device supplies power to the needle point device, the needle point device comprises a plurality of needle points, the plurality of needle points form a matrix on the cross section of the circulating air duct, and the needle points are connected with the negative potential of the ion power supply device; the electronic drainage part is made of a conductor material, the electronic drainage part and the needle point are arranged at intervals and correspondingly, and the electronic drainage part is connected with the zero potential of the ion power supply device.
Furthermore, the indoor air purification device also comprises a first electric dielectric dust collecting plate which is arranged in the shell and divides the ion generating device into a first section comprising an air inlet end and a second section comprising an air outlet end, the ultraviolet light source and the photocatalytic medium are arranged in the first section, and the needle point device and the electronic drainage part are arranged in the second section.
Further, indoor air purification device still includes the adsorption part, and the adsorption part sets up in the return air inlet department of indoor return air end.
Further, the first predetermined level is 1800 ten thousand ions per cubic centimeter, and the second predetermined level is 3 ten thousand ions per cubic centimeter.
The utility model discloses an indoor air purification device can make the ion concentration in the circulation wind channel reach first level of predetermineeing through ion generating device to the ion that utilizes high concentration removes the haze, the deactivation of disinfecting, the disinfection, remove multiple air purification measures such as peculiar smell, realize the effect that current multiple air purifier combination could realize simultaneously, consequently purifying effect is better, the ion can also flow out the circulation wind channel and get into indoorly in addition, make indoor ion concentration rise to the second level of predetermineeing, further purify indoor air.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural view of an embodiment of an indoor air purification apparatus according to the present invention;
fig. 2 is a schematic structural view showing an embodiment of an ion generating device of an indoor air cleaning device according to the present invention;
fig. 3 is a schematic structural diagram illustrating an embodiment of an ultraviolet light source of an ion generating device of an indoor air purifying apparatus according to the present invention;
fig. 4 shows a schematic structural view of an embodiment of a photocatalytic medium of an ion generating device of an indoor air purification device according to the present invention;
fig. 5 is a schematic view showing an effect of an ion generating device of an indoor air cleaning device according to an embodiment of the present invention in operation;
fig. 6 shows a schematic front view of a first embodiment of a housing of an ion generating device of an indoor air purification device according to the present invention;
fig. 7 shows a backward schematic view of a first embodiment of a housing of an ion generating device of an indoor air cleaning device according to the present invention;
fig. 8 shows a front schematic view of a second embodiment of a housing of an ion generating device of an indoor air cleaning device according to the present invention;
fig. 9 shows a backward schematic view of a second embodiment of the housing of the ion generating device of the indoor air cleaning device according to the present invention.
Wherein the figures include the following reference numerals:
10. a fan; 21. a housing; 22. an ultraviolet light source; 23. a photocatalytic medium; 24. a needle tip device; 25. an electronic drainage part; 26. a first dielectric dust collecting plate; 30. an air supply grille; 60. a hose; 70. a communicating pipe; 80. a control unit; 90. a pneumatic sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The utility model provides an indoor air purification device, as shown in fig. 1 to fig. 9, this indoor air purification device sets up in the circulation wind channel, and the circulation wind channel includes indoor return air end and indoor air supply end. The indoor air purifying device comprises an ion generating device which is arranged in the circulating air duct and used for generating ions. When the ion generating device operates, the ion concentration in at least one section in the circulating air duct reaches or exceeds a first preset level, and ions generated by the ion generating device can flow out of the air supply outlet of the indoor air supply end to enter the room, so that the ion concentration in the room reaches or exceeds a second preset level.
The utility model discloses an indoor air purification device can make the ion concentration in the circulation wind channel reach first level of predetermineeing through ion generating device to the ion that utilizes high concentration removes the haze, the deactivation of disinfecting, the disinfection, remove multiple air purification measures such as peculiar smell, realize the effect that current multiple air purifier combination could realize simultaneously, consequently purifying effect is better, the ion can also flow out the circulation wind channel and get into indoorly in addition, make indoor ion concentration rise to the second level of predetermineeing, further purify indoor air.
The indoor air purification device in this embodiment adopts the initiative purification technology to promote indoor air purification device's purifying effect. Specifically, the fan sets up in circulating air duct to form the air current from indoor return air end to indoor air supply end, when ion generating device moves, can disinfect the disinfection to the air current in the circulating air duct.
Preferably, the first predetermined level is 1800 ten thousand ions per cubic centimeter. When the ion concentration in a certain section of air duct reaches 1800 ten thousand per cubic centimeter, a light energy ion curtain is formed in the section of air duct, and pollutants are intensively treated and intercepted in the light energy ion curtain.
Preferably, the ion generating device is arranged at an air supply opening of the indoor air supply end.
Because ion generating device is close to the supply-air outlet setting of indoor air supply end, the ion that consequently ion generating device sent can follow the air outlet and flow the air flue, improves indoor ion concentration to make indoor particulate matter gather and subside under the effect of ion, and improve indoor air quality, improve user experience that indoor ion concentration can also improve.
Preferably, the second predetermined level is 3 ten thousand ions per cubic centimeter. The particles in the indoor air actively electrocoagulate and form larger clusters under the action of the ions flowing into the chamber, thereby actively settling.
The utility model discloses an indoor air purification device is provided with the circulation wind channel, as shown in FIG. 1, the entry in indoor wind channel is the return air inlet of indoor return air end, and the export in indoor wind channel is the supply-air outlet of indoor air supply end, and the circulation of indoor wind channel mainly used room air purifies.
Preferably, as shown in fig. 2 to 5, the ion generating device includes: the shell 21 comprises an air inlet end and an air outlet end; an ultraviolet light source 22 disposed within the housing 21; and the photocatalytic medium 23 is arranged in the shell 21, and when the ultraviolet light source 22 operates, after the light emitted by the ultraviolet light source 22 irradiates the photocatalytic medium 23, the air in the shell 21 generates a photocatalytic reaction to generate ions.
The function of the UV light source 22 is to generate UV light that can photolyze O2Generated oxygen family ions' O, O-And O+", i.e., light plasma, and ultraviolet rays also have an inactivating effect on microorganisms, viruses, and the like.
Specifically, in the embodiment shown in fig. 3, the uv source 22 is a broad-spectrum high-intensity coated quartz uv lamp, which is a single-ended 4-core uv lamp with a wavelength of 100 nm and 400 nm. The uv lamp may have a diameter of 19mm and a length of 108mm to 1650mm, the diameter and length being selected to fit the size of the air duct. The power of the ultraviolet lamp is 8W to 100W. The ultraviolet lamp is sleeved with a special transparent tetrafluoride tube with the diameter of 1 mm.
The photocatalytic medium 23 is used for generating a photocatalytic reaction, and when ultraviolet rays emitted by the ultraviolet light source 22 irradiate the photocatalytic medium 23, air in the air duct generates the photocatalytic reaction to generate ions of the ion curtain.
The photocatalytic reaction can generate more kinds of ions to purify air, different ions play different roles in the air purifying process, and certain ions can react with harmful gas to decompose harmful components such as VOC in the air.
Preferably, photocatalytic medium 23 comprises one or more metal oxides.
The photocatalytic medium 23 can include titanium dioxide, zinc oxide, and other metal oxides, and can be a single metal oxide or a combination of metal oxides.
When ultraviolet rays are irradiated onto titanium dioxide, the titanium dioxide acts as a catalyst for a photocatalytic reaction, which enables hydroxyl ions "OH" and hydrogen peroxide ions "H" to be generated in the air2O2", i.e., photo-hydrogen ions.
Preferably, the photocatalytic medium 23 is barrel-shaped, a plurality of through holes are opened on the barrel wall of the photocatalytic medium 23, and the ultraviolet light source 22 is disposed in the barrel-shaped photocatalytic medium 23. More preferably, the surface of the photocatalytic medium 23 undulates in the circumferential direction.
In the embodiment shown in fig. 4, the photocatalytic medium 23 is a cylindrical structure formed by integrally sintering a plurality of metal oxides, such as titanium dioxide and zinc oxide, having very strong photoelectric properties, on a corrugated aluminum substrate. The wave-shaped mesh cylinder is formed by rolling 12 convex peaks and 12 concave valleys of an aluminum substrate wave plate with the thickness of 1mm and the aperture of 6mm into a cylinder with the diameter of 50mm, and welding a top cover and a base at two ends.
In the embodiment shown in fig. 4, one end of the uv light source 22 is inserted into the spring steel clip of the top cover, and the other end is fitted with a silicone sealing ring and inserted into the central hole of the base.
Preferably, the air purification device further comprises a needle tip device 24, an electronic drainage part 25 and an ion power supply device; the ion power supply device supplies power to the needle point device 24, the needle point device 24 comprises a plurality of needle points, the plurality of needle points form a matrix on the cross section of the circulating air duct, and the needle points are connected with the negative potential of the ion power supply device. The electronic drainage part 25 is made of a conductor material, the electronic drainage part 25 and the needle point are arranged at intervals and correspondingly, and the electronic drainage part 25 is connected with the zero potential of the ion power supply device.
Wherein the tip device 24 is preferably a tungsten copper tip and the tip device 24 releases electrons into the airElectron and O2The generated negative oxygen ions not only have the sterilization effect, but also can make the air fresh and improve the user experience.
In particular, tip device 24 is a tungsten copper tip, 0.8mm in diameter and 15mm in length. The tungsten copper needle point group matrix is a unit body with the structural size of 200mm x 200mm, and is distributed with the airflow cross section in an assembled mode. The electronic drainage part 25 is 0.8mm thick and 10mm wide, is made of a 304 stainless steel plate strip frame ring, and is arranged at a position 5120mm away from the needle point.
Preferably, the indoor air purifying device further comprises a first dielectric dust collecting plate 26, the first dielectric dust collecting plate 26 is arranged in the housing 21, the ion generating device is divided into a first section comprising an air inlet end and a second section comprising an air outlet end, the ultraviolet light source 22 and the photocatalytic medium 23 are arranged in the first section, and the needle point device 24 and the electronic drainage part 25 are arranged in the second section.
The function of the first dielectric dust collecting plate 26 includes collecting particulate contaminants in the air, which functions as a filter for the air. The particles in the air, while passing through the ion curtain, interact with the charged ions and are electrocoagulated, becoming larger in volume and thus filtered by the first dielectric dust collecting plate 26.
The first dielectric dust collector plate 26 comprises a substrate and chlorine dioxide and/or silver ions formed on a surface of the substrate. Specifically, the method of manufacturing the first dielectric dust collecting plate 26 includes: the polypropylene film is used as a base material, chlorine dioxide and/or silver ions and the like are sprayed on the surfaces of the protrusions and the grooves of the polypropylene film after the surface is pre-charged, and the thickness of the polypropylene film is 10-30 mm.
Preferably, the air supply outlet of the indoor air supply end comprises a first air supply outlet and a second air supply outlet, the air outlet of the ion generation device forms the first air supply outlet, and the second air supply outlet is used for discharging airflow which does not flow through the inside of the ion generation device.
The air supply grille 30 is arranged at the air supply opening of the indoor air supply end, the air supply grille 30 is provided with a first air supply opening and a second air supply opening, wherein the first air supply opening is the air outlet end of the ion generating device, the second air supply opening is directly communicated with the circulating air duct, and the air flow discharged through the second air supply opening does not flow through the ion generating device.
Preferably, the indoor air purification device further comprises a PM2.5 monitoring device for monitoring the PM2.5 concentration in the room, so that the running power of the indoor air purification device can be automatically adjusted, and the indoor personnel can also remotely control the indoor air purification device by a remote controller in a wireless way. The PM2.5 monitoring device is electrically connected to the control unit 80, and outputs an electric signal to the control unit 80, and the control unit 80 is electrically connected to an actuator of the indoor air purification apparatus, and controls, for example, output powers of the fan 10 and the ion generating device. In addition, the indoor air purification device is further provided with a pneumatic sensor 90 which is arranged near the second air supply outlet of the indoor air supply end and used for monitoring the running state of the indoor air purification device and reporting abnormal conditions in time.
The utility model discloses an indoor air purification device wholly sets up in the top of indoor furred ceiling, does not occupy the interior space.
In the embodiment shown in fig. 1, the return air flow enters the communication duct 70 under the suction action of the blower to enter the hose 60 through the communication duct 70, and is conveyed through the hose 60 to a section near the indoor air supply opening, in which a part of the air flow enters the ion generating device from the air inlet end of the ion generating device and then enters the room from the air outlet end of the ion generating device, and the other part of the air flow directly enters the room through the air supply opening of the air supply grille 30, thereby completing one indoor air circulation.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an indoor air purification device, sets up in circulation wind channel, circulation wind channel includes indoor return air end and indoor air supply end, its characterized in that, indoor air purification device includes:
the ion generating device is arranged in the circulating air duct and is used for generating ions; when the ion generating device operates, the ion concentration in at least one section in the circulating air duct reaches or exceeds a first preset level, and ions generated by the ion generating device can flow out of the air supply outlet of the indoor air supply end to enter the room, so that the indoor ion concentration reaches or exceeds a second preset level.
2. The indoor air cleaning device according to claim 1, wherein the ion generating device is provided at an air supply port of the indoor air supply end.
3. An indoor air cleaning device according to claim 1, wherein the ion generating device includes:
the shell (21) comprises an air inlet end and an air outlet end;
an ultraviolet light source (22) disposed within the housing (21);
the photocatalytic medium (23) is arranged in the shell (21), when the ultraviolet light source (22) operates, after light rays emitted by the ultraviolet light source (22) irradiate the photocatalytic medium (23), air in the shell (21) generates a photocatalytic reaction to generate ions.
4. An indoor air purification apparatus as claimed in claim 3, wherein the photocatalytic medium (23) is barrel-shaped, a plurality of through holes are opened on a barrel wall of the photocatalytic medium (23), and the ultraviolet light source (22) is disposed in the photocatalytic medium (23).
5. Indoor air cleaning apparatus according to claim 4, characterized in that the surface of the photocatalytic medium (23) is undulated in the circumferential direction.
6. An indoor air purification apparatus according to claim 3, further comprising a needle tip device (24), an electronic drainage portion (25), and an ion power supply device; the ion power supply device supplies power to the needle point device (24), the needle point device (24) comprises a plurality of needle points, the plurality of needle points form a matrix on the cross section of the circulating air duct, and the needle points are connected with the negative potential of the ion power supply device; the electron drainage part (25) is made of a conductor material, the electron drainage part (25) and the needle point are arranged at intervals and correspondingly, and the electron drainage part (25) is connected with the zero potential of the ion power supply device.
7. An indoor air cleaning device according to claim 6, further comprising a first dielectric dust collecting plate (26), the first dielectric dust collecting plate (26) being disposed within the housing (21) dividing the ion generating device into a first section including the air inlet end and a second section including the air outlet end, the ultraviolet light source (22) and the photocatalytic medium (23) being disposed within the first section, the needle point device (24) and the electron diversion section (25) being disposed within the second section.
8. The indoor air purification apparatus according to claim 1, further comprising an adsorption portion provided at a return port of the indoor return air end.
9. An indoor air cleaning apparatus according to claim 1, wherein the first predetermined level is 1800 ten thousand ions per cubic centimeter and the second predetermined level is 3 ten thousand ions per cubic centimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021125957.6U CN212644889U (en) | 2020-06-17 | 2020-06-17 | Indoor air purifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021125957.6U CN212644889U (en) | 2020-06-17 | 2020-06-17 | Indoor air purifying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212644889U true CN212644889U (en) | 2021-03-02 |
Family
ID=74772764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021125957.6U Active CN212644889U (en) | 2020-06-17 | 2020-06-17 | Indoor air purifying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212644889U (en) |
-
2020
- 2020-06-17 CN CN202021125957.6U patent/CN212644889U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2553088C (en) | Photoelectrochemical air disinfection | |
| JP5546630B2 (en) | Microbe / virus capture / inactivation equipment | |
| US10010644B2 (en) | Photocatalytic device for ductless heating and air conditioning systems | |
| RU2767873C2 (en) | Fluid processing device | |
| KR200397471Y1 (en) | Air Handling Unit with Electric Precipitation Filter and UVC lamp | |
| EP4158256A1 (en) | Multi-function air purifing and sterilizing system | |
| KR102389862B1 (en) | Air conditioning system equipped with photocatalytic reactor module | |
| CN101839530A (en) | Centralized central air conditioner ventilation system | |
| CN212644889U (en) | Indoor air purifying device | |
| CN112594842A (en) | Air purification method and device based on combination of filtration, sterilization and catalysis diversification | |
| CN202505825U (en) | Air cleaning device and plasma generator | |
| CN115721766A (en) | Multi-effect composite sterilization plasma disinfection equipment | |
| CN104990106B (en) | Low temperature plasma air cleaning member and low-temperature plasma air purification device | |
| CN214009469U (en) | Plasma driving catalyst equipment for air disinfection and purification | |
| CN211503081U (en) | Ion purifier | |
| CN104990139B (en) | Low temperature plasma air cleaning unit | |
| CN212081481U (en) | Air purifying device | |
| CN113944975A (en) | Sterilizing machine | |
| CN111520830A (en) | Filter element, air purifier and air purification method | |
| CN213747184U (en) | Combined intelligent air disinfection and purification device | |
| CN110906466A (en) | Air purifying device | |
| CN110715382A (en) | New fan of deodorization sterilization | |
| CN212976129U (en) | Sterilizing air shower | |
| KR102643984B1 (en) | Air purification apparatus using photocatalyst by smart type | |
| CN218544617U (en) | Fan coil and central air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |