[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

CN216395871U - Adjustable spray tower for waste gas treatment - Google Patents

Adjustable spray tower for waste gas treatment Download PDF

Info

Publication number
CN216395871U
CN216395871U CN202121938547.8U CN202121938547U CN216395871U CN 216395871 U CN216395871 U CN 216395871U CN 202121938547 U CN202121938547 U CN 202121938547U CN 216395871 U CN216395871 U CN 216395871U
Authority
CN
China
Prior art keywords
wall
tower body
fixedly connected
spray
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN202121938547.8U
Other languages
Chinese (zh)
Inventor
黄小强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Dongli Environmental Technology Co ltd
Original Assignee
Nanjing Dongli Environmental Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nanjing Dongli Environmental Technology Co ltd filed Critical Nanjing Dongli Environmental Technology Co ltd
Priority to CN202121938547.8U priority Critical patent/CN216395871U/en
Application granted granted Critical
Publication of CN216395871U publication Critical patent/CN216395871U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The utility model discloses an adjustable spray tower for waste gas treatment, which belongs to the technical field of waste gas treatment equipment and comprises a tower body, wherein the right side surface of the tower body is fixedly connected with the left side surface of a water tank, the right side surface of the inner wall of the tower body is communicated with the left side surface of the inner wall of the water tank through a guide pipe, the inner wall of the tower body is fixedly connected with a water collecting plate, the left side surface of the inner wall of the tower body is provided with an air inlet, the right side surface of the inner wall of the tower body is provided with a filler opening, and the inner wall of the tower body is fixedly connected with a filler layer. This spray column with adjustable exhaust-gas treatment is used sprays the reposition of redundant personnel seat, sprays the shunt tubes, connecting pipe and spread groove through the setting, in the use, when acid material content in waste gas uprises, drives the transfer line through rotating rotatory handle and rotates, can make the device can handle the problem of the difference of acid material content in the waste gas through the size that changes the flow that sprays, has improved exhaust-gas treatment's efficiency, has increased the device's practicality simultaneously.

Description

Adjustable spray tower for waste gas treatment
Technical Field
The utility model belongs to the technical field of waste gas treatment equipment, and particularly relates to an adjustable spray tower for waste gas treatment.
Background
The spray tower is the simplest equipment for industrial dust removal or waste gas treatment, and has a simple structure and low manufacturing cost. The working principle of the spray tower can be divided into three forms of forward flow, reverse flow and cross flow. Among them, the most common is the counter-current shower method: acid mist waste gas which is acidic or alkaline is introduced into the purification tower through an air pipe, passes through the packing layer, is fed from the bottom of the tower, and is distributed by the gas distribution device to continuously pass through gaps of the packing layer in a countercurrent manner with the sodium hydroxide absorption liquid. On the surface of the packing, gas-liquid two phases are fully contacted with each other to absorb neutralization reaction so as to adsorb acidic or alkaline dirt contained in the waste gas. After the acid mist waste gas is purified, the acid mist waste gas is dewatered and demisted by a demisting plate, and then the clean gas is discharged into the atmosphere from a fan. The absorption liquid is sprayed down at the tower top after being pressurized by a water pump at the tower bottom, and finally flows back to the tower top for recycling. The existing spray tower is simple in structure, the spray flow cannot be changed according to the acid content in the waste gas, the acid substances cannot be stably absorbed by changing the spray flow when the acid content in the waste gas is large, the acid substance content in the waste gas cannot be completely treated, and the environment pollution is caused.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In order to overcome the defects in the prior art, the utility model provides an adjustable spray tower for waste gas treatment, which solves the problems that the structure of the existing spray tower is simple, the spray flow cannot be changed according to the acid content in the waste gas, the acid substances cannot be stably absorbed by changing the spray flow when the acid content in the waste gas is high, the acid substance content in the waste gas cannot be completely treated, and the environment is polluted.
(II) technical scheme
In order to achieve the purpose, the utility model provides the following technical scheme: an adjustable spray tower for waste gas treatment comprises a tower body, wherein the right side surface of the tower body is fixedly connected with the left side surface of a water tank, the right side surface of the inner wall of the tower body is communicated with the left side surface of the inner wall of the water tank through a flow guide pipe, the inner wall of the tower body is fixedly connected with a water collecting plate, the left side surface of the inner wall of the tower body is provided with an air inlet, the right side surface of the inner wall of the tower body is provided with a filler opening, the inner wall of the tower body is fixedly connected with a filler layer, the inner wall of the tower body is fixedly connected with a defogging layer, the upper surface of the inner wall of the tower body is provided with an air outlet, the lower surface of the inner wall of the tower body is clamped with a filter screen, the upper surface of the water tank is fixedly connected with a water pump, the water pumping opening of the water pump is communicated with the inner wall of the water tank through a pipeline, and the water outlet of the water pump is communicated with the lower surface of a spray shunting seat inner wall through a pipeline, the inner wall fixedly connected with spread groove of reposition of redundant personnel seat sprays, the water delivery groove has been seted up to the inner wall of spread groove.
The utility model discloses a shunt tubes, including the upper surface that sprays the reposition of redundant personnel seat, the upper surface that sprays the reposition of redundant personnel seat has seted up the spout, the inner wall sliding connection of spout has a plurality of slider, the last fixed surface of slider is connected with sprays the shunt tubes, the inner wall fixedly connected with connecting pipe that sprays the shunt tubes, the right flank of connecting pipe inner wall communicates with the left end of inlet tube, a plurality of splitter box has been seted up to the inner wall of connecting pipe, the inner wall that sprays the reposition of redundant personnel seat is linked together with the first spray tube of a plurality of, the inner wall that sprays the shunt tubes is linked together with a plurality of second spray tube, the lower surface of first spray tube and the equal fixedly connected with a plurality of shower nozzle of lower surface of second spray tube, the last fixed surface that sprays the shunt tubes is connected with the bull stick, the top of bull stick is passed through the gear train and is connected with the right-hand member transmission of transfer line.
As a further scheme of the utility model: the left side of the inner wall of the tower body is communicated with the right end of the sewage discharge pipe, and the left end of the transmission rod is fixedly connected with a rotary handle.
As a further scheme of the utility model: the inner wall joint of water-collecting plate has the filter screen, the lower surface of connecting pipe and the lower surface sliding connection of spread groove inner wall.
As a further scheme of the utility model: the air inlet is positioned below the packing layer, and the lower surface of the demisting layer is fixedly connected with a fixed rod.
As a further scheme of the utility model: the surface of the transmission rod is movably connected with the surface of the fixed rod through a rotating shaft, and the surface of the water inlet pipe is tightly connected with the inner wall of the connecting groove.
As a further scheme of the utility model: the chute is circular, and the right side face of the filling opening is provided with a cover plate.
(III) advantageous effects
Compared with the prior art, the utility model has the beneficial effects that:
1. the adjustable spray tower for treating waste gas is provided with a spray distribution seat, a spray distribution pipe, a connecting pipe and a connecting groove, when the content of acidic substances in the waste gas is high in the using process, a rotating handle is rotated to drive a transmission rod to rotate so as to drive a rotating rod to rotate, the rotating rod rotates to drive the spray distribution pipe to rotate, the spray distribution pipe rotates to drive the connecting pipe to rotate, the connecting pipe stops rotating when the water inlet pipe and a water delivery tank are overlapped, meanwhile, water pumped out by a water pump enters the inner wall of the spray distribution seat through a pipeline, is sprayed out through each spray nozzle after being distributed by each first spray pipe, and part of water enters the water inlet pipe through the water delivery tank, enters the connecting pipe through the water inlet pipe, enters the spray connecting pipe through the distribution groove, is sprayed out through each spray nozzle after being distributed by each second spray pipe, and passes through the combined action of the first spray pipe and the second spray pipe, the range grow that the messenger sprayed, the flow that sprays simultaneously also increases to handle the acid material in the waste gas, can make the device can handle the problem of the difference of acid material content in the waste gas through the size that changes the flow that sprays, improved exhaust-gas treatment's efficiency, increased the practicality of device simultaneously.
2. This spray column with adjustable exhaust-gas treatment is used, through setting up the water-collecting plate, the filter screen, drain and water tank, in the use, the scavenging solution after spraying passes through the collection back of water-collecting plate, it gets into the tower body bottom to filter through the filter screen, through after settling in the tower body bottom through filter screen and honeycomb duct flow in the water tank, water after saying to filter through the water pump is taken out once more, send into through the pipeline and spray the reposition of redundant personnel seat, can handle precipitate in the scavenging solution through drain and change filter screen in addition, prevent that the precipitate from causing the jam to the pipeline, reach the reuse of water resource.
3. This spray column with adjustable exhaust-gas treatment is used, through setting up the transfer line, the gear train, bull stick and rotatory handle, in the use, when the flow that sprays needs to be changed, rotate rotatory handle, rotatory handle drives the rotation of transfer line, the rotation of transfer line drives the rotation of gear train, the rotation of gear train drives the rotation of bull stick, the rotation of bull stick drives the rotation that sprays the shunt tubes, the rotation that sprays the shunt tubes drives the rotation of connecting pipe, the connecting pipe rotates and to make the inlet tube coincide with the water delivery tank mutually, thereby make water can enter into and spray the shunt tubes, thereby make the shower nozzle of second spray tube lower surface can work, reach the purpose that increases the spray flow.
Drawings
FIG. 1 is a schematic cross-sectional view of the front view of the present invention;
FIG. 2 is a schematic perspective view of a first nozzle of the present invention;
FIG. 3 is a schematic three-dimensional structure of a connecting groove of the present invention;
FIG. 4 is an enlarged schematic view of the utility model at A;
in the figure: the device comprises a tower body 1, a water tank 2, a water collecting plate 3, an air inlet 4, a filling opening 5, a water pump 6, a defogging layer 7, an air outlet 8, a transmission rod 9, a gear set 10, a first spray pipe 11, a packing layer 12, a pipeline 13, a filter screen 14, a spray shunt pipe 15, a spray shunt seat 16, a spray shunt seat 17, a second spray pipe 17, a connecting groove 18, a connecting pipe 19, a sliding block 20, a sliding groove 21, a water inlet pipe 22, a shunt groove 23, a water delivery groove 24, a rotating rod 25 and a spray head 26.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
As shown in fig. 1 to 4, the present invention provides a technical solution: an adjustable spray tower for waste gas treatment comprises a tower body 1, the right side surface of the tower body 1 is fixedly connected with the left side surface of a water tank 2, the right side surface of the inner wall of the tower body 1 is communicated with the left side surface of the inner wall of the water tank 2 through a guide pipe, the inner wall of the tower body 1 is fixedly connected with a water collecting plate 3, the left side surface of the inner wall of the tower body 1 is provided with an air inlet 4, the right side surface of the inner wall of the tower body 1 is provided with a filler opening 5, the inner wall of the tower body 1 is fixedly connected with a filler layer 12, the inner wall of the tower body 1 is fixedly connected with a defogging layer 7, the upper surface of the inner wall of the tower body 1 is provided with an air outlet 8, the lower surface of the inner wall of the tower body 1 is clamped with a filter screen 14 with the lower surface of the water collecting plate 3, the upper surface of the water tank 2 is fixedly connected with a water pump 6, a water pumping opening of the water pump 6 is communicated with the inner wall of the water tank 2 through a pipeline 13, a water outlet of the water pump 6 is communicated with the lower surface of a spray shunting seat 16 through a pipeline 13, the inner wall of the spraying and shunting seat 16 is fixedly connected with a connecting groove 18, and the inner wall of the connecting groove 18 is provided with a water conveying tank 24.
Spout 21 has been seted up to the upper surface that sprays reposition of redundant personnel seat 16, the inner wall sliding connection of spout 21 has a plurality of slider 20, slider 20's last fixed surface is connected with sprays shunt tubes 15, the inner wall fixedly connected with connecting pipe 19 that sprays shunt tubes 15, the right flank of connecting pipe 19 inner wall communicates with the left end of inlet tube 22, a plurality of splitter box 23 has been seted up to the inner wall of connecting pipe 19, the inner wall that sprays reposition of redundant personnel seat 16 is linked together with a plurality of first spray tube 11, the inner wall that sprays shunt tubes 15 is linked together with a plurality of second spray tube 17, the lower surface of first spray tube 11 and the equal fixedly connected with a plurality of shower nozzle 26 of lower surface of second spray tube 17, the last fixed surface that sprays shunt tubes 15 is connected with bull stick 25, gear train 10 is passed through on the top of bull stick 25 and the right-hand member transmission of transfer line 9 is connected.
Specifically, as shown in fig. 1, the left side of the inner wall of the tower body 1 is communicated with the right end of a drain pipe, the left end of a transmission rod 9 is fixedly connected with a rotary handle, the inner wall of a water collecting plate 3 is connected with a filter screen 14 in a clamping manner, an air inlet 4 is positioned below a packing layer 12, a fixed rod is fixedly connected with the lower surface of a defogging layer 7, the surface of the transmission rod 9 is movably connected with the surface of the fixed rod through a rotating shaft, the right side of a filling opening 5 is provided with a cover plate, the drain pipe can discharge sediments generated on the lower surface of the inner wall of the tower body 1 through the arrangement of the drain pipe, so as to prevent blockage caused by the sediments, the rotary handle is arranged, the rotary handle can rotate through the transmission rod 9, a gear set 10 and a rotating rod 25 to drive a spraying flow dividing pipe 15, and the filter screen 14 can filter most sediments in the liquid, so as to prevent blockage of other devices in the device, through setting up air inlet 4, air inlet 4 is located the below of packing layer 12 and can makes the waste gas that air inlet 4 came in take effect with alkaline liquid when passing through packing layer 12, thereby acidic material reduces in the messenger's waste gas, through setting up the dead lever, the dead lever can play supplementary fixed effect to transfer line 9, through setting up transfer line 9, the surperficial swing joint through pivot and dead lever of transfer line 9, the dead lever plays supplementary fixed effect to transfer line 9, through setting up the apron, the apron can prevent that the waste gas in the tower from passing through packing mouth 5 and discharging, cause the pollution of environment.
Specifically, as shown in fig. 2, chute 21 shape is circular, the lower surface of connecting pipe 19 and the lower surface sliding connection of connecting groove 18 inner wall, the surface of inlet tube 22 and the inner wall zonulae occludens of connecting groove 18, through setting up chute 21, chute 21 is circular can make slider 20 slide in chute 21, make spray shunt tubes 15 can rotate on spray shunt seat 16, through setting up connecting groove 18, connecting groove 18 can make connecting pipe 19 rotate in connecting groove 18, thereby make inlet tube 22 can coincide with water delivery groove 24, alkaline liquid can enter into inlet tube 22 through the delivery tank, through setting up inlet tube 22, inlet tube 22 and the inner wall zonulae occludens of connecting groove 18, can be when inlet tube 22 does not coincide with water delivery groove 24, inlet tube 22 can not get into alkaline liquid.
The working principle of the utility model is as follows:
s1, when the device is used, the water pump 6 is turned on, so that alkaline liquid in the water tank 2 enters the spraying and shunting seat 16 through the water pump 6 and the pipeline 13, and then is sprayed in the tower body 1 through the spray heads 26 on the first spray pipes 11, meanwhile, waste gas enters the tower body 1 from the gas inlet 4, the waste gas and sodium hydroxide absorption liquid are subjected to gas-liquid two-phase full contact absorption neutralization reaction through the packing layer 12, and acid mist waste gas is purified;
s2, dehydrating and demisting the waste gas by the demisting layer 7, and then discharging the waste gas, wherein when acidic substances in the waste gas become large, the rotating handle can be rotated to drive the transmission rod 9 to rotate, and the gear set 10 and the rotating rod 25 drive the spraying shunt tube 15 to rotate, so that the connecting tube 19 is driven to rotate in the connecting groove 18, and when an inlet tube on the surface of the connecting tube 19 is overlapped with the water conveying groove 24 in the connecting groove 18;
s3, the alkaline liquid enters the spraying shunt pipe 15 from the spraying shunt base 16 through the water conveying tank 24 and is sprayed out through the spray heads 26 on the second spray pipes 17, so that the first spray pipe 11 and the second spray pipes 17 work together to increase the spraying flow, and the purified liquid enters the water tank 2 again after being collected by the water collecting plate 3 and filtered by the filter screen 14.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims (6)

1. The utility model provides a spray column with adjustable exhaust-gas treatment is with, includes tower body (1), its characterized in that: the water tank is characterized in that the right side surface of the tower body (1) is fixedly connected with the left side surface of the water tank (2), the right side surface of the inner wall of the tower body (1) is communicated with the left side surface of the inner wall of the water tank (2) through a guide pipe, the inner wall of the tower body (1) is fixedly connected with a water collecting plate (3), the left side surface of the inner wall of the tower body (1) is provided with an air inlet (4), the right side surface of the inner wall of the tower body (1) is provided with a filler opening (5), the inner wall of the tower body (1) is fixedly connected with a filler layer (12), the inner wall of the tower body (1) is fixedly connected with a defogging layer (7), the upper surface of the inner wall of the tower body (1) is provided with an air outlet (8), the lower surface of the inner wall of the tower body (1) is connected with the lower surface of the water collecting plate (3) in a clamping manner through a filter screen (14), the upper surface of the water tank (2) is fixedly connected with a water pump (6), and the water pumping opening of the water pump (6) is communicated with the inner wall of the water tank (2) through a pipeline (13), a water outlet of the water pump (6) is communicated with the lower surface of the inner wall of the spraying and shunting seat (16) through a pipeline (13), the inner wall of the spraying and shunting seat (16) is fixedly connected with a connecting groove (18), and the inner wall of the connecting groove (18) is provided with a water conveying groove (24);
the upper surface of the spraying and shunting seat (16) is provided with a sliding groove (21), the inner wall of the sliding groove (21) is slidably connected with a plurality of sliding blocks (20), the upper surface of each sliding block (20) is fixedly connected with a spraying and shunting pipe (15), the inner wall of each spraying and shunting seat (15) is fixedly connected with a connecting pipe (19), the right side surface of the inner wall of each connecting pipe (19) is communicated with the left end of a water inlet pipe (22), the inner wall of each connecting pipe (19) is provided with a plurality of shunting grooves (23), the inner wall of each spraying and shunting seat (16) is communicated with a plurality of first spray pipes (11), the inner wall of each spraying and shunting pipe (15) is communicated with a plurality of second spray pipes (17), the lower surface of each first spray pipe (11) and the lower surface of each second spray pipe (17) are fixedly connected with a plurality of spray heads (26), and the upper surface of each spraying and shunting pipe (15) is fixedly connected with a rotating rod (25), the top end of the rotating rod (25) is in transmission connection with the right end of the transmission rod (9) through a gear set (10).
2. The adjustable spray tower for treating exhaust gas as claimed in claim 1, wherein: the left side surface of the inner wall of the tower body (1) is communicated with the right end of the sewage discharge pipe, and the left end of the transmission rod (9) is fixedly connected with a rotary handle.
3. The adjustable spray tower for treating exhaust gas as claimed in claim 1, wherein: the inner wall joint of water-collecting plate (3) has filter screen (14), the lower surface of connecting pipe (19) and the lower surface sliding connection of spread groove (18) inner wall.
4. The adjustable spray tower for treating exhaust gas as claimed in claim 1, wherein: the air inlet (4) is positioned below the packing layer (12), and the lower surface of the demisting layer (7) is fixedly connected with a fixing rod.
5. The adjustable spray tower for the exhaust gas treatment according to claim 4, wherein: the surface of the transmission rod (9) is movably connected with the surface of the fixed rod through a rotating shaft, and the surface of the water inlet pipe (22) is tightly connected with the inner wall of the connecting groove (18).
6. The adjustable spray tower for treating exhaust gas as claimed in claim 1, wherein: the chute (21) is circular, and a cover plate is arranged on the right side face of the filling opening (5).
CN202121938547.8U 2021-08-18 2021-08-18 Adjustable spray tower for waste gas treatment Expired - Fee Related CN216395871U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121938547.8U CN216395871U (en) 2021-08-18 2021-08-18 Adjustable spray tower for waste gas treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121938547.8U CN216395871U (en) 2021-08-18 2021-08-18 Adjustable spray tower for waste gas treatment

Publications (1)

Publication Number Publication Date
CN216395871U true CN216395871U (en) 2022-04-29

Family

ID=81288251

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121938547.8U Expired - Fee Related CN216395871U (en) 2021-08-18 2021-08-18 Adjustable spray tower for waste gas treatment

Country Status (1)

Country Link
CN (1) CN216395871U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116832585A (en) * 2023-08-08 2023-10-03 江苏申久(集团)有限公司 Double-layer staggered type adjustable liquid distribution disc for process tower

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116832585A (en) * 2023-08-08 2023-10-03 江苏申久(集团)有限公司 Double-layer staggered type adjustable liquid distribution disc for process tower
CN116832585B (en) * 2023-08-08 2024-03-15 江苏申久(集团)有限公司 Double-layer staggered type adjustable liquid distribution disc for process tower

Similar Documents

Publication Publication Date Title
WO2020042379A1 (en) Exhaust spray tower
CN108561212A (en) A kind of automobile exhaust gas processing apparatus
CN218077126U (en) A exhaust gas purification device for atmospheric pollution administers
CN214233334U (en) Spraying device for waste gas purification tower
CN206701063U (en) A kind of emission-control equipment of multi-stage, efficient
CN216395871U (en) Adjustable spray tower for waste gas treatment
CN210993597U (en) Waste gas recovery processing device
CN201150830Y (en) Water bath spraying duster
CN216964004U (en) Gas purification system for butyronitrile glove production
CN207654875U (en) Dust-extraction unit and cleaner
CN213590063U (en) Desulfurizing tower for environmental protection atmosphere treatment
CN213433738U (en) Vertical absorption tower of VOCs
CN210544345U (en) Exhaust emission device of mill
CN113019054A (en) Gas filtering, cooling and purifying device and method for gas extraction pipeline
CN219290958U (en) Exhaust treatment box with water purification function
CN210159353U (en) Exhaust gas purification device is used in production of end-capping polyether amine
CN2703966Y (en) Wet flue gas high-efficiency desulfurizing and dust-removing equipment suitable for various desulfurizing agents
CN203123741U (en) Fume dedusting circulation purification device
CN115646651A (en) Black smoke purification equipment and purification method for diesel generator
CN216367203U (en) Circulating spray tower for organic waste gas treatment
CN215388482U (en) Industrial dust collector convenient to clean
CN211025616U (en) A kind of air purification equipment for collecting waste silk in textile workshop
CN220779760U (en) Pneumatic mixed flow device of cyclone spray tower
CN216171310U (en) Acid mist spray tower for producing iron oxide pigment
CN206142847U (en) High -efficiency sewage treating device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20220429