技术领域Technical Field
本实用新型涉及防排烟技术领域，具体是一种消防工程用防排烟装置。The utility model relates to the technical field of smoke prevention and exhaust, in particular to a smoke prevention and exhaust device for fire protection engineering.
背景技术Background technique
防排烟系统是防烟系统和排烟系统的总称。防烟系统采用机械加压送风方式或自然通风方式，防止烟气进入疏散通道的系统；排烟系统采用机械排烟方式或自然通风方式，将烟气排至建筑物外的系统。现有的防排烟装置主要通过滤网有效地对烟气内部的灰尘进行阻挡工作，滤网表面会粘附大量延长，若长时间不进行清理会造成烟道空气流通较差，影响防排烟效果，Smoke prevention and exhaust system is a general term for smoke prevention system and smoke exhaust system. Smoke prevention system uses mechanical pressurized air supply or natural ventilation to prevent smoke from entering the evacuation passage; smoke exhaust system uses mechanical smoke exhaust or natural ventilation to exhaust smoke outside the building. Existing smoke prevention and exhaust devices mainly use filters to effectively block dust inside the smoke. A large amount of dust will adhere to the surface of the filter. If it is not cleaned for a long time, it will cause poor air circulation in the flue, affecting the smoke prevention and exhaust effect.
中国专利公开号为CN216799122U的实用新型，公开了一种消防工程用防排烟装置，包括排风管、支架、风机、安装管、连接单元和过滤单元，所述支架固定设于排风管内，所述风机固定设于支架上，所述安装管贴合设于排风管内壁上，所述连接单元设于安装管与排风管之间，所述连接单元包括环形气囊、软质气管、气缸和活塞，所述安装管外壁上设有外环槽，所述排风管内壁上设有内环槽，所述环形气囊固定设于外环槽上并且贴合设于内环槽上，所述气缸固定设于排风管上，所述活塞滑动设于气缸内。上述装置主要通过环形气囊的膨胀完成安装管与排风管的限位连接工作，当需要对滤网进行清理时需要将安装管从排风管抽出，然后滤网弹出，清理工作较为不便，另外滤网抽出时灰尘掉落逸散，不便于进行集中清理。The utility model of China Patent Publication No. CN216799122U discloses a smoke exhaust device for fire protection engineering, including an exhaust pipe, a bracket, a fan, a mounting pipe, a connecting unit and a filter unit, wherein the bracket is fixedly arranged in the exhaust pipe, the fan is fixedly arranged on the bracket, the mounting pipe is fitted on the inner wall of the exhaust pipe, the connecting unit is arranged between the mounting pipe and the exhaust pipe, the connecting unit includes an annular airbag, a soft air pipe, a cylinder and a piston, an outer ring groove is arranged on the outer wall of the mounting pipe, an inner ring groove is arranged on the inner wall of the exhaust pipe, the annular airbag is fixedly arranged on the outer ring groove and fitted on the inner ring groove, the cylinder is fixedly arranged on the exhaust pipe, and the piston is slidably arranged in the cylinder. The above device mainly completes the limited connection work of the mounting pipe and the exhaust pipe through the expansion of the annular airbag. When the filter needs to be cleaned, the mounting pipe needs to be pulled out from the exhaust pipe, and then the filter pops out, which is inconvenient to clean. In addition, when the filter is pulled out, dust falls and scatters, which is not convenient for centralized cleaning.
实用新型内容Utility Model Content
本实用新型的目的在于提供一种消防工程用防排烟装置，以解决上述背景技术中提出的问题。The purpose of the utility model is to provide a smoke prevention and exhaust device for fire protection engineering to solve the problems raised in the above background technology.
本实用新型的技术方案是：一种消防工程用防排烟装置，包括排风管，所述排风管一侧底端连通有导风管，所述导风管内设置有安装在所述排风管上的抽吸组件，所述排风管一侧开设有倾斜设置的侧口，所述侧口内滑插有延伸至所述排风管内部的滤网板，所述排风管内部顶端靠近所述滤网板位置处安装有双向清理组件，所述双向清理组件包括双向驱动组件，所述双向驱动组件的两个移动端上均固定有与所述滤网板外侧贴合的刷条，所述排风管的底部开设有位于所述滤网板下方的收集口，所述收集口底部滑动安装有收集组件，所述收集口内侧边缘处固定有与所述收集组件内侧壁贴合的刮料件。The technical solution of the utility model is: a smoke exhaust device for fire protection engineering, comprising an exhaust duct, the bottom end of one side of the exhaust duct is connected to an air guide duct, the air guide duct is provided with a suction assembly installed on the exhaust duct, one side of the exhaust duct is provided with an inclined side port, a filter plate extending to the inside of the exhaust duct is slidably inserted into the side port, a two-way cleaning assembly is installed at the top of the exhaust duct near the filter plate, the two-way cleaning assembly comprises a two-way drive assembly, both moving ends of the two-way drive assembly are fixed with brush strips that fit with the outer side of the filter plate, a collecting port is provided at the bottom of the exhaust duct below the filter plate, a collecting assembly is slidably installed at the bottom of the collecting port, and a scraper that fits with the inner wall of the collecting assembly is fixed at the inner edge of the collecting port.
优选的，所述抽吸组件包括转动安装在所述排风管顶部的转轴，所述转轴的底端延伸至所述导风管内固定有扇叶片，所述转轴的顶端穿过所述排风管顶部传动连接有第一电机。Preferably, the suction assembly includes a rotating shaft rotatably mounted on the top of the exhaust duct, the bottom end of the rotating shaft extends to the air guide duct and is fixed with fan blades, and the top end of the rotating shaft passes through the top of the exhaust duct and is transmission-connected to a first motor.
优选的，所述导风管的底端固定有圆孔板，所述圆孔板设置在所述扇叶片下方。Preferably, a circular hole plate is fixed to the bottom end of the air guide duct, and the circular hole plate is arranged below the fan blades.
优选的，所述双向驱动组件包括固定在所述排风管顶端内壁上的横板，所述横板靠近所述滤网板的一侧开设有滑槽，所述滑槽内转动安装有双向丝杆，所述双向丝杆的两端均螺纹套设有与所述滑槽滑动配合的滑块，所述滑块的一侧与所述刷条的顶端连接，所述双向丝杆的一端穿过所述排风管外侧壁连接有第二电机。Preferably, the bidirectional drive assembly includes a horizontal plate fixed on the inner wall at the top end of the exhaust duct, a sliding groove is provided on the side of the horizontal plate close to the filter plate, a bidirectional screw rod is rotatably installed in the sliding groove, both ends of the bidirectional screw rod are threadedly sleeved with sliders that slide with the sliding groove, one side of the slider is connected to the top end of the brush strip, and one end of the bidirectional screw rod passes through the outer wall of the exhaust duct and is connected to a second motor.
优选的，所述收集口顶端靠近所述滤网板边缘位置处固定有导料条，所述收集口顶端远离所述导料条的一侧固定有斜板。Preferably, a material guide strip is fixed to the top of the collecting port near the edge of the filter plate, and an inclined plate is fixed to the side of the top of the collecting port away from the material guide strip.
优选的，所述收集组件包括收集箱，所述收集口底端两侧均固定有L型的滑条，所述收集箱顶端滑动卡接在两个滑条之间，所述收集箱的底端一侧连接有导料筒，所述导料筒底端套设有堵头，所述收集箱一侧外壁上固定有把手，所述刮料件的外侧边缘处与所述收集箱内壁贴合。Preferably, the collecting assembly includes a collecting box, L-shaped sliding bars are fixed on both sides of the bottom end of the collecting port, the top of the collecting box is slidably connected between the two sliding bars, one side of the bottom end of the collecting box is connected to a material guide cylinder, a plug is provided at the bottom end of the material guide cylinder, a handle is fixed on the outer wall of one side of the collecting box, and the outer edge of the scraper is in contact with the inner wall of the collecting box.
优选的，所述刮料件包括固定在所述收集口内的刮料框，所述刮料框内固定有推板，所述刮料框的边缘处设置有与所述收集箱内部贴合的刮边。Preferably, the scraper member comprises a scraper frame fixed in the collecting port, a push plate is fixed in the scraper frame, and a scraper edge that fits with the inside of the collecting box is provided at the edge of the scraper frame.
本实用新型通过改进在此提供一种消防工程用防排烟装置，与现有技术相比，具有如下改进及优点：The utility model provides a smoke exhaust device for fire protection engineering through improvement, which has the following improvements and advantages compared with the prior art:
其一：本实用新型通过抽吸组件能够配合导风管将室内含有烟尘的空气抽吸至排风管，侧口内滑插安装的滤网板能够对空气中烟尘进行过滤工作，烟尘长时间粘附在滤网板上容易造成滤网孔堵塞，通过双向驱动组件带动两个刷条进行相互靠近或远离运动，对滤网板表面进行清灰工作，实现对滤网板的快速清理工作目的，不需要进行拆卸工作，当滤网板使用周期结束后将其从侧口内抽出进行更换；First, the utility model can cooperate with the air guide pipe to suck the indoor air containing smoke and dust into the exhaust pipe through the suction component, and the filter plate installed by sliding in the side port can filter the smoke and dust in the air. The smoke and dust adhere to the filter plate for a long time and easily cause the filter holes to be blocked. The two brush strips are driven by the two-way driving component to move closer to or away from each other to clean the surface of the filter plate, thereby achieving the purpose of rapid cleaning of the filter plate without disassembly. When the filter plate is used up, it is pulled out from the side port for replacement;
其二：本实用新型通过收集箱能够对烟尘进行收集工作，利用把手推动收集箱沿着收集口底端滑动，刮料框上的刮边对粘附在收集箱内侧壁上的烟尘刮除，配合推板将烟尘集中推入导料筒内，打开导料筒底部的堵头，实现对烟尘的快速排出工作目的。Secondly, the utility model can collect smoke and dust through a collection box. The collection box is pushed by a handle to slide along the bottom of the collection port. The scraping edge on the scraper frame scrapes off the smoke and dust adhering to the inner wall of the collection box. The push plate is used to push the smoke and dust into the guide barrel, and the plug at the bottom of the guide barrel is opened to achieve the purpose of quickly discharging the smoke and dust.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
下面结合附图和实施例对本实用新型作进一步解释：The utility model is further explained below in conjunction with the accompanying drawings and embodiments:
图1是本实用新型的立体结构示意图；Fig. 1 is a schematic diagram of the three-dimensional structure of the utility model;
图2是本实用新型的剖面立体结构示意图；FIG2 is a schematic diagram of a cross-sectional three-dimensional structure of the utility model;
图3是本实用新型中双向清理组件的立体结构示意图；FIG3 is a schematic diagram of the three-dimensional structure of the bidirectional cleaning assembly of the present invention;
图4是本实用新型中灰尘导出工作状态的结构示意图。FIG. 4 is a schematic structural diagram of the dust extraction working state in the utility model.
附图标记说明：Description of reference numerals:
1、排风管；2、导风管；3、抽吸组件；31、转轴；32、扇叶片；33、第一电机；4、侧口；5、滤网板；6、双向清理组件；61、横板；62、滑槽；63、第二电机；64、滑块；65、刷条；7、收集组件；71、收集箱；72、导料筒；73、把手；8、收集口；9、斜板；10、导料条；11、圆孔板；12、刮料件；121、刮料框；122、推板；123、刮边。1. Exhaust duct; 2. Air guide duct; 3. Suction assembly; 31. Rotating shaft; 32. Fan blades; 33. First motor; 4. Side port; 5. Filter plate; 6. Two-way cleaning assembly; 61. Horizontal plate; 62. Slide groove; 63. Second motor; 64. Sliding block; 65. Brush strip; 7. Collecting assembly; 71. Collecting box; 72. Material guide barrel; 73. Handle; 8. Collecting port; 9. Inclined plate; 10. Material guide strip; 11. Circular hole plate; 12. Scraping piece; 121. Scraping frame; 122. Push plate; 123. Scraping edge.
具体实施方式Detailed ways
下面对本实用新型进行详细说明，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。The utility model is described in detail below, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
本实用新型通过改进在此提供一种消防工程用防排烟装置，本实用新型的技术方案是：The utility model provides a smoke exhaust device for fire protection engineering through improvement. The technical solution of the utility model is:
实施例1Example 1
如图1-图4所示，一种消防工程用防排烟装置，包括排风管1，排风管1一侧底端连通有导风管2，导风管2内设置有安装在排风管1上的抽吸组件3，排风管1一侧开设有倾斜设置的侧口4，侧口4内滑插有延伸至排风管1内部的滤网板5，排风管1内部顶端靠近滤网板5位置处安装有双向清理组件6，双向清理组件6包括双向驱动组件，双向驱动组件的两个移动端上均固定有与滤网板5外侧贴合的刷条65，排风管1的底部开设有位于滤网板5下方的收集口8，收集口8底部滑动安装有收集组件7，收集口8内侧边缘处固定有与收集组件7内侧壁贴合的刮料件12。As shown in Figures 1 to 4, a smoke exhaust device for fire protection engineering includes an exhaust duct 1, the bottom end of one side of the exhaust duct 1 is connected to an air guide duct 2, a suction assembly 3 installed on the exhaust duct 1 is arranged in the air guide duct 2, an inclined side port 4 is opened on one side of the exhaust duct 1, a filter plate 5 extending to the inside of the exhaust duct 1 is slidably inserted in the side port 4, a two-way cleaning assembly 6 is installed at the top of the exhaust duct 1 near the filter plate 5, the two-way cleaning assembly 6 includes a two-way driving assembly, brush strips 65 that are fitted with the outer side of the filter plate 5 are fixed on both movable ends of the two-way driving assembly, a collecting port 8 located below the filter plate 5 is opened at the bottom of the exhaust duct 1, a collecting assembly 7 is slidably installed at the bottom of the collecting port 8, and a scraper 12 that is fitted with the inner wall of the collecting assembly 7 is fixed at the inner edge of the collecting port 8.
借由上述结构，通过抽吸组件3能够配合导风管2将室内含有烟尘的空气抽吸至排风管1，侧口4内滑插安装的滤网板5能够对空气中烟尘进行过滤工作，烟尘长时间粘附在滤网板5上容易造成滤网孔堵塞，通过双向驱动组件带动两个刷条65进行相互靠近或远离运动，对滤网板5表面进行清灰工作，实现对滤网板5的快速清理工作目的，不需要进行拆卸工作，当滤网板5使用周期结束后将其从侧口4内抽出进行更换，清除后的灰尘掉落至收集组件7内，推动收集组件7沿着收集口8底端滑动，刮料件12能够在收集组件7内运动过程中对其内壁上黏附的灰尘进行刮除工作并将烟尘推动至收集组件7一端，便于对烟尘进行集中处理工作。By means of the above structure, the suction component 3 can cooperate with the air guide duct 2 to suck the indoor air containing smoke and dust into the exhaust duct 1, and the filter plate 5 slidably installed in the side port 4 can filter the smoke and dust in the air. The smoke and dust adhering to the filter plate 5 for a long time is likely to cause the filter holes to be blocked. The two brush strips 65 are driven by the two-way driving component to move towards or away from each other, and the surface of the filter plate 5 is cleaned, so as to achieve the purpose of rapid cleaning of the filter plate 5 without disassembly. When the filter plate 5 has a use cycle, it is pulled out of the side port 4 for replacement, and the cleaned dust falls into the collection component 7, which pushes the collection component 7 to slide along the bottom end of the collection port 8. The scraper 12 can scrape off the dust adhering to the inner wall of the collection component 7 during its movement and push the smoke and dust to one end of the collection component 7, so as to facilitate the centralized treatment of the smoke and dust.
实施例2Example 2
在实施例1的基础上，本实施例对抽吸组件3进行了创新设计，具体地，抽吸组件3包括转动安装在排风管1顶部的转轴31，转轴31的底端延伸至导风管2内固定有扇叶片32，转轴31的顶端穿过排风管1顶部传动连接有第一电机33，导风管2的底端固定有圆孔板11，圆孔板11设置在扇叶片32下方，通过第一电机33能够带动转轴31底端的扇叶片32转动，实现对室内空气的抽吸作用目的。On the basis of Example 1, this embodiment has innovatively designed the suction component 3. Specifically, the suction component 3 includes a rotating shaft 31 rotatably installed on the top of the exhaust duct 1, the bottom end of the rotating shaft 31 extends to the air duct 2 and is fixed with fan blades 32, the top end of the rotating shaft 31 passes through the top of the exhaust duct 1 and is transmission-connected to a first motor 33, a circular hole plate 11 is fixed at the bottom end of the air duct 2, and the circular hole plate 11 is arranged below the fan blades 32. The fan blades 32 at the bottom end of the rotating shaft 31 can be driven to rotate by the first motor 33 to achieve the purpose of sucking the indoor air.
实施例3Example 3
在实施例1的基础上，本实施例对双向驱动组件进行了创新设计，具体地，双向驱动组件包括固定在排风管1顶端内壁上的横板61，横板61靠近滤网板5的一侧开设有滑槽62，滑槽62内转动安装有双向丝杆，双向丝杆的两端均螺纹套设有与滑槽62滑动配合的滑块64，滑块64的一侧与刷条65的顶端连接，双向丝杆的一端穿过排风管1外侧壁连接有第二电机63，通过第二电机63能够带动双向丝杆转动，进而驱动两个滑块64上的刷条65沿着滤网板5侧面做相互靠近或相互远离运动，实现清理工作目的。On the basis of Example 1, this embodiment has made an innovative design for the bidirectional drive component. Specifically, the bidirectional drive component includes a horizontal plate 61 fixed on the inner wall at the top end of the exhaust duct 1, and a slide groove 62 is opened on the side of the horizontal plate 61 close to the filter plate 5. A bidirectional screw is rotatably installed in the slide groove 62, and both ends of the bidirectional screw are threadedly sleeved with sliders 64 that slide with the slide groove 62. One side of the slider 64 is connected to the top of the brush strip 65, and one end of the bidirectional screw passes through the outer wall of the exhaust duct 1 and is connected to a second motor 63. The second motor 63 can drive the bidirectional screw to rotate, thereby driving the brush strips 65 on the two sliders 64 to move toward or away from each other along the side of the filter plate 5, thereby achieving the purpose of cleaning.
实施例4Example 4
在实施例1的基础上，本实施例为了增加对烟尘的收集效果，具体地，收集口8顶端靠近滤网板5边缘位置处固定有导料条10，收集口8顶端远离导料条10的一侧固定有斜板9，导料条10能够对清理的延长进行导料工作，便于将烟尘导入收集组件7内，斜板9能够避免进入收集组件7内的烟尘溢出。On the basis of Example 1, in order to increase the collection effect of smoke and dust, this embodiment has a guide strip 10 fixed at the top of the collection port 8 near the edge of the filter plate 5, and an inclined plate 9 is fixed at the side of the top of the collection port 8 away from the guide strip 10. The guide strip 10 can guide the material for the extension of the cleaning process, so as to facilitate the introduction of smoke and dust into the collection component 7, and the inclined plate 9 can prevent the smoke and dust entering the collection component 7 from overflowing.
实施例5Example 5
在实施例1的基础上，本实施例对收集组件7以及刮料件12进行了创新设计，具体地，收集组件7包括收集箱71，收集口8底端两侧均固定有L型的滑条，收集箱71顶端滑动卡接在两个滑条之间，收集箱71的底端一侧连接有导料筒72，导料筒72底端套设有堵头，收集箱71一侧外壁上固定有把手73，刮料件12的外侧边缘处与收集箱71内壁贴合，刮料件12包括固定在收集口8内的刮料框121，刮料框121内固定有推板122，刮料框121的边缘处设置有与收集箱71内部贴合的刮边123，通过收集箱71能够对烟尘进行收集工作，利用把手73推动收集箱71沿着收集口8底端滑动，刮料框121上的刮边123对粘附在收集箱71内侧壁上的烟尘刮除，配合推板122将烟尘集中推入导料筒72内，打开导料筒72底部的堵头，实现对烟尘的快速排出工作目的。On the basis of Example 1, this embodiment makes an innovative design for the collecting component 7 and the scraping member 12. Specifically, the collecting component 7 includes a collecting box 71, and L-shaped slide bars are fixed on both sides of the bottom of the collecting port 8. The top of the collecting box 71 is slidably connected between the two slide bars. A guide cylinder 72 is connected to one side of the bottom of the collecting box 71, and a plug is provided at the bottom end of the guide cylinder 72. A handle 73 is fixed on the outer wall of one side of the collecting box 71. The outer edge of the scraping member 12 is in contact with the inner wall of the collecting box 71. The scraping member 12 includes a handle 73 fixed in the collecting port 8. A scraper frame 121 is provided with a push plate 122 fixed inside the scraper frame 121. A scraper edge 123 that fits with the inside of the collecting box 71 is provided at the edge of the scraper frame 121. The smoke can be collected through the collecting box 71. The handle 73 is used to push the collecting box 71 to slide along the bottom of the collecting port 8. The scraper edge 123 on the scraper frame 121 scrapes off the smoke adhering to the inner wall of the collecting box 71. The push plate 122 cooperates with the smoke to be pushed into the guide barrel 72, and the plug at the bottom of the guide barrel 72 is opened to achieve the purpose of quickly discharging the smoke.
工作原理：通过第一电机33能够带动转轴31底端的扇叶片32转动，配合导风管2将室内含有烟尘的空气抽吸至排风管1，侧口4内滑插安装的滤网板5能够对空气中烟尘进行过滤工作，烟尘长时间粘附在滤网板5上容易造成滤网孔堵塞，通过第二电机63能够带动双向丝杆转动，进而驱动两个滑块64上的刷条65进行相互靠近或远离运动，对滤网板5表面进行清灰工作，实现对滤网板5的快速清理工作目的，不需要进行拆卸工作，当滤网板5使用周期结束后将其从侧口4内抽出进行更换，清除后的灰尘掉落至收集组件7内，其中收集箱71能够对烟尘进行收集工作，利用把手73推动收集箱71沿着收集口8底端滑动，刮料框121上的刮边123对粘附在收集箱71内侧壁上的烟尘刮除，配合推板122将烟尘集中推入导料筒72内，打开导料筒72底部的堵头，实现对烟尘的快速排出工作目的。Working principle: The fan blade 32 at the bottom of the rotating shaft 31 can be driven to rotate by the first motor 33, and the air containing smoke and dust in the room is sucked into the exhaust pipe 1 in cooperation with the air guide duct 2. The filter plate 5 installed by sliding insertion in the side port 4 can filter the smoke and dust in the air. The smoke and dust adhere to the filter plate 5 for a long time and easily cause the filter holes to be blocked. The second motor 63 can drive the bidirectional screw rod to rotate, and then drive the brush strips 65 on the two sliders 64 to move closer to or away from each other, so as to clean the surface of the filter plate 5 and realize the rapid cleaning of the filter plate 5. For working purpose, no disassembly work is required. When the filter plate 5 has a service life, it will be pulled out from the side port 4 for replacement. The removed dust will fall into the collecting assembly 7, wherein the collecting box 71 can collect the smoke. The handle 73 is used to push the collecting box 71 to slide along the bottom of the collecting port 8. The scraping edge 123 on the scraper frame 121 scrapes off the smoke adhering to the inner wall of the collecting box 71, and cooperates with the push plate 122 to push the smoke into the guide barrel 72, and open the plug at the bottom of the guide barrel 72 to achieve the purpose of quickly discharging the smoke.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322404456.1UCN220771292U (en) | 2023-09-05 | 2023-09-05 | Fire control engineering is with preventing fume extractor |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322404456.1UCN220771292U (en) | 2023-09-05 | 2023-09-05 | Fire control engineering is with preventing fume extractor |
| Publication Number | Publication Date |
|---|---|
| CN220771292Utrue CN220771292U (en) | 2024-04-12 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322404456.1UExpired - Fee RelatedCN220771292U (en) | 2023-09-05 | 2023-09-05 | Fire control engineering is with preventing fume extractor |
| Country | Link |
|---|---|
| CN (1) | CN220771292U (en) |
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| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20240412 |