CN212833309U - Three-level selection mechanism of water resource recycling system - Google Patents
Three-level selection mechanism of water resource recycling system Download PDFInfo
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- CN212833309U CN212833309U CN202021235372.XU CN202021235372U CN212833309U CN 212833309 U CN212833309 U CN 212833309U CN 202021235372 U CN202021235372 U CN 202021235372U CN 212833309 U CN212833309 U CN 212833309U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 317
- 238000004064 recycling Methods 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 title claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 86
- 238000000746 purification Methods 0.000 claims abstract description 43
- 239000008213 purified water Substances 0.000 claims abstract description 11
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 30
- 238000012544 monitoring process Methods 0.000 claims description 28
- 238000005192 partition Methods 0.000 claims description 28
- 238000001556 precipitation Methods 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 238000011118 depth filtration Methods 0.000 abstract description 4
- 230000008676 import Effects 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- -1 particularly Substances 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The utility model discloses a tertiary selection mechanism of water resource recycling system, including the catch basin, with the deposit header tank of catch basin intercommunication and with the filtration header tank of the delivery port intercommunication of deposit header tank, filtration header tank intercommunication has the purification header tank, the roof of purification header tank is equipped with the purified water import, the roof of purification header tank fixedly connected with clarifier, the clarifier includes the degree of depth filtration storehouse, purification storehouse and the disinfection storehouse that communicate in proper order, be equipped with first baffle and second baffle between degree of depth filtration storehouse, purification storehouse and the disinfection storehouse, first baffle fixed connection is on the inboard roof of clarifier, and the second baffle fixed connection is on the inboard bottom wall of clarifier; the bottom of the purification water collecting tank is provided with a secondary utilization water outlet, a municipal utilization water outlet and an overflow water outlet, and the secondary utilization water outlet, the municipal utilization water outlet and the overflow water outlet are respectively provided with a first electric valve, a second electric valve and a third electric valve.
Description
Technical Field
The utility model relates to a water resource recycling equipment technical field, in particular to tertiary selection mechanism of water resource recycling system.
Background
Although the total amount of resources is rich in China, the occupied amount of resources per person is small due to the large population of China; especially fresh water resources, the number of the fresh water resources per capita in China is small and the fresh water resources are not uniformly distributed, the discharge amount of urban sewage is large, and the treatment cost is high. In order to effectively improve the utilization rate of the existing resources and promote the innovation of scientific technology, the state puts forward and adheres to the strategy of sustainable development; at present, most of water used in urban toilets is edible water, and domestic sewage is directly discharged into a dirty well through a sewer and cannot be effectively recycled, so that a large amount of water resources are wasted, and the development theory of sustainable development is violated.
Accordingly, there is a need for a selection mechanism of a water resource recycling system that collects domestic sewage, particularly, water with less pollution such as wash water and vegetable washing water, in a concentrated manner according to the characteristic that the peak time of the wash water and vegetable washing water coincides with the peak time of the toilet water, and recycles the collected water by simple physical filtration. The selection mechanism of the water resource recycling system in the prior art is complex in structure, high in energy consumption and incapable of meeting the required requirements in the purification effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tertiary selection mechanism of water resource system of recycling to solve at least one of the problem that exists among the foretell prior art.
The utility model adopts the following technical scheme:
a three-level selection mechanism of a water resource recycling system comprises a water collecting tank, a precipitation water collecting tank communicated with the water collecting tank and a filtration water collecting tank communicated with a water outlet of the precipitation water collecting tank, wherein the filtration water collecting tank is communicated with a purification water collecting tank, a purified water inlet is formed in the top wall of the purification water collecting tank, a purifier is fixedly connected to the top wall of the purification water collecting tank and comprises a depth filtration bin, a purification bin and a disinfection bin which are sequentially communicated, a first partition plate and a second partition plate are arranged among the depth filtration bin, the purification bin and the disinfection bin, the first partition plate is fixedly connected to the top wall of the inner side of the purifier, and the second partition plate is fixedly connected to the bottom wall of the inner side of the purifier; the bottom of the purification water collecting tank is provided with a secondary utilization water outlet, a municipal utilization water outlet and an overflow water outlet, and the secondary utilization water outlet, the municipal utilization water outlet and the overflow water outlet are respectively provided with a first electric valve, a second electric valve and a third electric valve.
Further, still include the controller, still be equipped with level sensor in the purification header tank, level sensor and the input electric connection of controller, first motorised valve, second motorised valve and third motorised valve respectively with the output electric connection of controller.
Further, the municipal administration utilizes the outlet to be equipped with flow sensor, flow sensor and the input electric connection of controller.
Furthermore, a first water quality monitoring probe is arranged in the purification water collecting tank, a water return port is arranged at the bottom of the purification water collecting tank, a first return electric valve and a first water pump are arranged at the water return port, and the water return port is communicated with the purified water inlet; the input end of the controller is electrically connected with the first water quality monitoring probe, and the output end of the controller is electrically connected with the first reflux electric valve and the first water pump.
Further, the first partition plate and the second partition plate are arranged in parallel.
Furthermore, a filtering water inlet is formed in the top of the filtering water collecting tank, a filter is fixedly connected to the top of the filtering water collecting tank, the filter comprises a physical filtering bin and a plurality of biochemical filtering bins, the filtering water inlet is communicated with the physical filtering bin, a filtering water outlet is formed in the bottom of each biochemical filtering bin, and water flows into the filtering water collecting tank through the filtering water outlet after being filtered by the physical filtering bin and the biochemical filtering bin; a third partition plate and a fourth partition plate are arranged between the physical filtering bin and the biochemical filtering bin, the third partition plate is fixedly connected to the top wall of the inner side of the filter, and the fourth partition plate is fixedly connected to the bottom wall of the inner side of the filter; a second water quality monitoring probe is arranged in the filtering water collecting tank, a water return port is arranged at the bottom of the filtering water collecting tank, a second backflow electric valve and a second water pump are arranged at the water return port, and the water return port is communicated with the filtered water inlet; the input end of the controller is electrically connected with the second water quality monitoring probe, and the output end of the controller is electrically connected with the second reflux electric valve and the second water pump.
Furthermore, the side wall of the filtering water collecting tank is provided with an overflow gap, and the height of the overflow gap is lower than that of the filtered water outlet.
The utility model has the advantages as follows:
1. the utility model discloses a purify the header tank and separate between deep filtration storehouse, purification storehouse and the disinfection storehouse through first baffle and second baffle, this structure can increase the flow of water in the clarifier, improves the filter effect under the condition that does not increase the clarifier volume.
2. The utility model discloses a be equipped with level sensor in the purification header tank, set up critical water level in advance on the controller, when the water level that level sensor detected reached critical water level, the third motorised valve was opened to the controller, discharges unnecessary water through the overflow outlet, makes the purification header tank can keep certain water level, prevents that the water level is too high to arouse the pollutant in the clarifier to flow back to the aquatic in the purification header tank.
3. The utility model discloses a water quality testing probe detects the water quality parameter in the purification header tank to transmit the controller, the controller opens first return valve, starts first water pump when the water quality parameter is greater than or equal to in the controller predetermined second grade utilizes the water quality parameter, water in will purifying the header tank carries the water purification import again and carries out loop filter and reach required requirement until purifying the header tank in quality of water, can only open first motorised valve and second motorised valve through the controller after reaching the requirement. The utility model discloses simple structure, convenient operation need not manual operation in the whole filtering process, and can guarantee that the quality of water of purifying collection reaches required requirement.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
fig. 3 is an enlarged schematic view of the structure at B in fig. 1.
Shown in the figure: 1-a water collecting tank, 2-a first water quality monitoring probe, 3-a controller, 4-a precipitation water collecting tank, 5-a first baffle, 6-a second baffle, 7-a first water outlet, 8-a first electric three-way valve, 9-a second water outlet, 10-an impurity outlet, 11-a second electric return valve, 12-a third water outlet, 13-a filtration water collecting tank, 14-a second water quality monitoring probe, 15-an overflow port, 16-a filter, 1601-a physical filtration bin, 1602-a first biochemical filtration bin, 1603-a third clapboard, 1604-a fourth clapboard, 1605-a second biochemical filtration bin, 1606-a dry-wet separation box, 1607-a filtered water outlet, 17-a fourth water outlet, 18-a second electric three-way valve, 19-a purification water collecting tank, 20-a second water pump, 21-a purifier, 2101-a first clapboard, 2102-a second clapboard, 2103-a deep filtration bin, 2104-a purification bin, 2105-a disinfection bin, 22-a filtration water inlet, 23-a primary utilization water outlet pipe, 24-a liquid level sensor, 25-a first reflux electric valve, 26-a first water pump, 27-a flow sensor, 28-a first electric valve, 29-a second electric valve, 30-a third electric valve, 31-a third water quality monitoring probe and 32-a purified water inlet.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The technical solution of the present invention is further explained with reference to fig. 1 to 3.
A three-level selection mechanism of a water resource recycling system comprises a water collecting tank 1, a precipitation water collecting tank 4 communicated with the water collecting tank 1 and a filtration water collecting tank 13 communicated with a water outlet of the precipitation water collecting tank 4, wherein the filtration water collecting tank 13 is communicated with a purification water collecting tank 19, a purified water inlet 32 is formed in the top wall of the purification water collecting tank 19, a purifier 21 is fixedly connected to the top wall of the purification water collecting tank 19, the purifier 21 comprises a deep filtration bin 2103, a purification bin 2104 and a disinfection bin 2105 which are sequentially communicated, a first partition 2101 and a second partition 2102 which are arranged in parallel are arranged between the deep filtration bin 2103, the purification bin 2104 and the disinfection bin 2105, the first partition 2101 is fixedly connected to the top wall of the inner side of the purifier 21, and the second partition 2102 is fixedly connected to the bottom wall of the inner side of the; the bottom of the purification water collecting tank 19 is provided with a secondary utilization water outlet, a municipal utilization water outlet and an overflow water outlet, and the secondary utilization water outlet, the municipal utilization water outlet and the overflow water outlet are respectively provided with a first electric valve 28, a second electric valve 29 and a third electric valve 30.
The utility model provides a tertiary selection mechanism of water resource system of recycling, still includes controller 3, still is equipped with level sensor 24 in the purification header tank 19, and level sensor 24 and controller 3's input electric connection, first motorised valve 28, second motorised valve 29 and third motorised valve 30 respectively with controller 3's output electric connection. The municipal water outlet is provided with a flow sensor 27, and the flow sensor 27 is electrically connected with the input end of the controller 3.
A first water quality monitoring probe 2 is arranged in the purifying water collecting tank 19, a water return port is arranged at the bottom of the purifying water collecting tank 19, a first return electric valve 25 and a first water pump 26 are arranged at the water return port, and the water return port is communicated with a purified water inlet 32; the input end of the controller 3 is electrically connected with the first water quality monitoring probe 2, and the output end of the controller 3 is electrically connected with the first reflux electric valve 25 and the first water pump 26.
The top of filtering water collecting tank 13 is equipped with filters water inlet 22, filters water collecting tank 13's top fixedly connected with filter 16, and filter 16 includes physics filtration storehouse 1601, first biochemical filtration storehouse 1602 and second biochemical filtration storehouse 1605, filters water inlet 22 and physics filtration storehouse 1601 intercommunication, and second biochemical filtration storehouse 1605 bottom is equipped with the drainage outlet 1607, and water flows in filtering water collecting tank 13 through drainage outlet 1607 after filtering through physics filtration storehouse 1601 and biochemical filtration storehouse. A third partition plate 1603 and a fourth partition plate 1604 are arranged among the physical filtering bin 1601, the first biochemical filtering bin 1602 and the second biochemical filtering bin 1605, the third partition plate 1603 is fixedly connected to the top wall of the inner side of the filter 16, and the fourth partition plate 1604 is fixedly connected to the bottom wall of the inner side of the filter 16. A second water quality monitoring probe 14 is arranged in the filtering water collecting tank 13, a water return port is arranged at the bottom of the filtering water collecting tank 13, a second backflow electric valve 11 and a second water pump 20 are arranged at the water return port, and the water return port is communicated with a filtered water inlet 22; the input end of the controller 3 is electrically connected with the second water quality monitoring probe 14, and the output end of the controller 3 is electrically connected with the second reflux electric valve 11 and the second water pump 20.
The sidewall of the filtering water collecting tank 13 is provided with an overflow port 15, and the height of the overflow port 15 is lower than that of the filtered water outlet 1607.
A third water quality monitoring probe 31 is arranged in the water collecting tank 1, a water outlet is arranged at the bottom of the water collecting tank 1 and is communicated with a first water outlet 7 and a second water outlet 9, a first electric three-way valve 8 is arranged at the joint of the first water outlet 7 and the second water outlet 9, and a sedimentation water collecting tank 4 is communicated with the second water outlet 9. The third water quality monitoring probe 31 is electrically connected with the input end of the controller 3, and the first electric three-way valve 8 is electrically connected with the output end of the controller 3.
Deposit the first baffle of inboard roof fixedly connected with 5 of header tank 4, deposit the inboard diapire fixedly connected with second baffle 6 of header tank 4, first baffle 5 and 6 parallel arrangement of second baffle. The precipitation water collecting tank 4 is provided with an impurity outlet 10 and a third water outlet 12, the impurity outlet 10 and the third water outlet 12 are respectively positioned at the bottom of the precipitation water collecting tank 4 and are respectively positioned at two sides of the second baffle 6, and the impurity outlet 10 and the water inlet of the precipitation water collecting tank are positioned at the same side of the second baffle 6; the third water outlet 12 is communicated with the filtering water inlet 22.
The working process of the utility model is as follows:
the washing water and the vegetable washing water are collected through the water collecting tank 1, the water quality parameters in the water collecting tank 1 are detected in real time through the third water quality monitoring probe 31, and the data are transmitted to the controller 3. The critical parameter of the third water quality monitoring probe 31 is preset on the controller 3, when the water quality parameter detected by the third water quality monitoring probe 31 is larger than or equal to the critical parameter, the controller 3 controls the first electric three-way valve 8 to discharge the water in the water collecting tank 1 through the first water outlet 7, and when the detected water quality parameter is lower than the critical parameter, the controller 3 controls the first electric three-way valve 8 to flow the water in the water collecting tank 1 into the precipitation water collecting tank 4 through the second water outlet 9. The precipitation water collecting tank 4 is provided with a first baffle 5 and a second baffle 6, water flows into the space between the first baffle 5 and the second baffle 6 from the bottom of the first baffle 5, the water level slowly rises, and when the water level exceeds the top of the second baffle 6, the precipitated water flows into the filtration water collecting tank 13 through a third water outlet 12. The water is long at 4 dwell times that deposit the header tank, and water flows out from 6 tops of second baffle, consequently can play the effect of deposiing impurity, and impurity deposits and discharges through impurity export 10 after a certain amount. The water enters the filter 16 in the filtering water collecting tank 13, flows into the filtering water collecting tank 13 after passing through the physical filtering bin 1601, the first biochemical filtering bin 1602 and the second biochemical filtering bin 1605 in sequence and being filtered, detects the water quality parameter in the filtering water collecting tank 13 through the second water quality monitoring probe 14, and transmits the data to the controller 3. The critical parameter of the second water quality monitoring probe 14 is preset on the controller 3, when the water quality parameter detected by the second water quality monitoring probe 14 is greater than or equal to the critical parameter, the controller 3 opens the second backflow electric valve 11, starts the second water pump 20, conveys the water in the filtering water collecting tank 13 to the filtering water inlet 22, and performs the filtering operation again until the water quality parameter detected by the second water quality monitoring probe 14 is lower than the critical parameter, and the controller 3 closes the second backflow electric valve 11 and the second water pump 20. The controller 3 opens the second electric three-way valve 18, communicates the fourth water outlet 17 with the water inlet of the filtering and water collecting tank 13, conveys the filtered water to the purifying and water collecting tank 19, and when the water in the filtering and water collecting tank 13 is needed (one-stage utilization), the second electric three-way valve 18 is manually opened through the controller, and the fourth water outlet 17 is communicated with the one-stage utilization water discharging pipe. The water enters the purifier 21 in the purification water collecting tank 19, flows into the purification water collecting tank 19 after sequentially flowing through the deep filtration bin 2103, the purification bin 2104 and the disinfection bin 2105, detects the water quality parameters in the purification water collecting tank 19 through the first water quality monitoring probe 2, and transmits the data to the controller 3. The critical parameter of the first water quality monitoring probe 2 is preset on the controller 3, when the water quality parameter detected by the first water quality monitoring probe 2 is greater than or equal to the critical parameter, the controller 3 opens the first reflux electric valve 25, starts the first water pump 26, conveys the water in the purified water collecting tank 19 to the filtering water inlet 32, and performs the purification operation again until the water quality parameter detected by the first water quality monitoring probe 2 is lower than the critical parameter, and the controller 3 closes the first reflux electric valve 25 and the first water pump 26. When the water in the purified water collecting tank 19 is needed to be used (secondary utilization), the first electric valve 28 is manually opened through the controller, and the water in the purified water collecting tank is discharged into a secondary utilization drain pipe. When the water quality detected by the first water quality probe 2 meets the requirement, the controller 3 opens the second electric valve 29, and the water in the purification water collecting tank 19 is measured by the flow sensor and then discharged into municipal facilities. The liquid level sensor transmits water level data in the purifying water collecting tank 19 to the controller 3 in real time, a critical water level is preset on the controller 3, when the water level detected by the liquid level sensor 24 reaches the critical water level, the controller 3 opens the third electric valve 30, and excess water is discharged through the overflow drain outlet, so that the purifying water collecting tank 19 can keep a certain water level, and pollutants in the purifier 21 are prevented from flowing back to the water in the purifying water collecting tank 19 due to overhigh water level.
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 (7)
1. A three-level selection mechanism of a water resource recycling system is characterized by comprising a water collecting tank, a precipitation water collecting tank communicated with the water collecting tank and a filtration water collecting tank communicated with a water outlet of the precipitation water collecting tank, wherein the filtration water collecting tank is communicated with a purification water collecting tank, a purified water inlet is formed in the top wall of the purification water collecting tank, a purifier is fixedly connected to the top wall of the purification water collecting tank, the purifier comprises a deep filtration bin, a purification bin and a disinfection bin which are sequentially communicated, a first partition plate and a second partition plate are arranged among the deep filtration bin, the purification bin and the disinfection bin, the first partition plate is fixedly connected to the top wall of the inner side of the purifier, and the second partition plate is fixedly connected to the bottom wall of the inner side of the purifier; the bottom of the purification water collecting tank is provided with a secondary utilization water outlet, a municipal utilization water outlet and an overflow water outlet, and the secondary utilization water outlet, the municipal utilization water outlet and the overflow water outlet are respectively provided with a first electric valve, a second electric valve and a third electric valve.
2. The three-stage selection mechanism for the water resource recycling system according to claim 1, further comprising a controller, wherein a liquid level sensor is further disposed in the purification water collection tank, the liquid level sensor is electrically connected to an input end of the controller, and the first electrically operated valve, the second electrically operated valve and the third electrically operated valve are respectively electrically connected to an output end of the controller.
3. The three-stage selection mechanism for the water resource recycling system as claimed in claim 2, wherein the municipal drainage outlet is provided with a flow sensor, and the flow sensor is electrically connected with the input end of the controller.
4. The three-stage selection mechanism for a water resource recycling system according to claim 2, wherein the purifying water collecting tank is provided with a first water quality monitoring probe therein, the bottom of the purifying water collecting tank is provided with a water return port, the water return port is provided with a first return electric valve and a first water pump, and the water return port is communicated with the purified water inlet; the input end of the controller is electrically connected with the first water quality monitoring probe, and the output end of the controller is electrically connected with the first reflux electric valve and the first water pump.
5. The three-stage selection mechanism for a water resource recycling system as claimed in claim 1, wherein said first partition and said second partition are disposed in parallel.
6. The three-level selection mechanism for the water resource recycling system according to claim 1, wherein the top of the filtering water collecting tank is provided with a filtering water inlet, the top of the filtering water collecting tank is fixedly connected with a filter, the filter comprises a physical filtering bin and a plurality of biochemical filtering bins, the filtering water inlet is communicated with the physical filtering bin, the bottom of the biochemical filtering bin is provided with a filtered water outlet, and water flows into the filtering water collecting tank through the filtered water outlet after being filtered by the physical filtering bin and the biochemical filtering bin; a third partition plate and a fourth partition plate are arranged between the physical filtering bin and the biochemical filtering bin, the third partition plate is fixedly connected to the top wall of the inner side of the filter, and the fourth partition plate is fixedly connected to the bottom wall of the inner side of the filter; a second water quality monitoring probe is arranged in the filtering water collecting tank, a water return port is arranged at the bottom of the filtering water collecting tank, a second backflow electric valve and a second water pump are arranged at the water return port, and the water return port is communicated with the filtered water inlet; the input end of the controller is electrically connected with the second water quality monitoring probe, and the output end of the controller is electrically connected with the second reflux electric valve and the second water pump.
7. The three-stage selection mechanism for a water recycling system as claimed in claim 1, wherein the sidewall of the filtering header tank is provided with an overflow gap having a height lower than that of the filtered water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021235372.XU CN212833309U (en) | 2020-06-30 | 2020-06-30 | Three-level selection mechanism of water resource recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021235372.XU CN212833309U (en) | 2020-06-30 | 2020-06-30 | Three-level selection mechanism of water resource recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212833309U true CN212833309U (en) | 2021-03-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021235372.XU Expired - Fee Related CN212833309U (en) | 2020-06-30 | 2020-06-30 | Three-level selection mechanism of water resource recycling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212833309U (en) |
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2020
- 2020-06-30 CN CN202021235372.XU patent/CN212833309U/en not_active Expired - Fee Related
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Granted publication date: 20210330 |