CN211706066U - Wastewater treatment filtration system - Google Patents
Wastewater treatment filtration system Download PDFInfo
- Publication number
- CN211706066U CN211706066U CN201922154725.7U CN201922154725U CN211706066U CN 211706066 U CN211706066 U CN 211706066U CN 201922154725 U CN201922154725 U CN 201922154725U CN 211706066 U CN211706066 U CN 211706066U
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- water distribution
- water
- cylinder
- filter cartridge
- washing
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- 238000001914 filtration Methods 0.000 title claims abstract description 28
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 155
- 238000005406 washing Methods 0.000 claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 23
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- 239000002351 wastewater Substances 0.000 claims abstract description 8
- 238000011010 flushing procedure Methods 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims 2
- 239000012535 impurity Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 11
- 230000009471 action Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 239000010842 industrial wastewater Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a wastewater treatment filtering system, which comprises a centrifugal wastewater filtering device and a cleaning device; the centrifugal wastewater filtering device comprises a separating cylinder, a cylinder cover, a filter cylinder and a limiting structure which is arranged between the separating cylinder and the cylinder cover and used for limiting the filter cylinder; the cleaning device comprises an inner washing mechanism, a plurality of outer washing mechanisms, a water tank, a water pump and a water pump motor. In the use process of the utility model, the sewage is enabled to slide into the bottom of the conical cylinder along the inner wall of the separation cylinder through the centrifugal separation effect of the centrifugal separation cylinder, thereby reducing the quantity of the fixed impurities accumulated on the surface of the filter screen, improving the filtering efficiency and prolonging the maintenance interval time of the filter screen; the inner cavity of the filter screen is convenient to wash through the inner washing mechanism, and the outer wall of the filter screen and the inner wall of the separation barrel are convenient to wash through the outer washing mechanisms, so that the labor intensity of workers in maintaining the filter screen is reduced.
Description
Technical Field
The utility model relates to a sewage treatment technical field specifically is a waste water treatment filtration system.
Background
Along with the development and progress of the industry, more and more industrial wastewater is generated, and the industrial wastewater has a large amount of solid impurities which can hinder the subsequent sewage purification treatment, so that the solid impurities need to be separated from the sewage. Most of the existing separation devices directly filter solid impurities in sewage by using a screen, wherein the solid impurities directly impact the screen, and a large amount of fixed impurities are accumulated on the surface of the screen to influence the filtering efficiency of the screen; regular maintenance of the filter screen is frequent; the filter screen is maintained by manual replacement or cleaning, and the labor intensity of workers is high.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the defects of the prior art, the utility model aims at providing a wastewater treatment filtering system, which ensures that solid impurities slide into the bottom of a conical cylinder along the inner wall of a separating cylinder under the centrifugal separation action of a centrifugal separating cylinder, thereby reducing the quantity of the fixed impurities accumulated on the surface of a filter screen, improving the filtering efficiency and prolonging the maintenance interval time of the filter screen; the inner washing mechanism is arranged to facilitate washing of the inner cavity of the filter screen during washing, and the plurality of outer washing mechanisms are arranged to facilitate washing of the outer wall of the filter screen and the inner wall of the separation cylinder during washing, so that the labor intensity of workers in maintaining the filter screen is reduced; and the water distribution mechanism of interior washing mechanism and outer washing mechanism all is provided with transparent observation box, and when the flush fluid infiltrated in to motor department, the outlet can lead the flush fluid to the water tank to through transparent observation box, the workman can in time know the condition that this department takes place to leak through transparent observation box.
Technical scheme
In order to realize the high purpose of the utility model, the utility model provides a following technical scheme: a wastewater treatment filtering system comprises a centrifugal wastewater filtering device and a cleaning device;
the centrifugal wastewater filtering device comprises a separating cylinder, a cylinder cover arranged at the upper end of the separating cylinder and a filter cylinder arranged between the separating cylinder and the cylinder cover through a limiting structure; a water inlet pipe tangent to the inner wall of the separating cylinder is arranged on one side of the upper part of the separating cylinder, a water outlet pipe communicated with the inner cavity of the filter cylinder is arranged on the lower part of the separating cylinder, and a sewage outlet is arranged at the lower end of the separating cylinder;
the cleaning device comprises an inner washing mechanism, a plurality of outer washing mechanisms, a water tank, a water pump and a water pump motor, wherein the inner washing mechanism and the plurality of outer washing mechanisms are arranged on the cylinder cover;
the inner flushing mechanism comprises a water distribution sleeve arranged at the top of the barrel cover, a water distribution shaft rotatably arranged in the water distribution sleeve, a motor arranged at the top of the water distribution sleeve and used for driving the water distribution shaft to rotate, and a detachable inner flushing structure arranged at the lower end of the water distribution shaft;
the outer washing mechanism comprises a water distribution sleeve arranged at the top of the barrel cover, a water distribution shaft rotatably arranged in the water distribution sleeve, a motor arranged at the top of the water distribution sleeve and used for driving the water distribution shaft to rotate, and a detachable outer washing structure arranged at the lower end of the water distribution shaft.
Preferably, the middle part of one side of the water distribution sleeve is provided with a water distribution hole which is convenient for connecting a water inlet pipe, and the upper part of the other side of the water distribution sleeve is provided with a water drainage hole which prevents water from leaking to the motor.
Preferably, a transparent observation box is arranged at the top of the water tank, and the top of the observation box is communicated with a plurality of water drainage holes of the water distribution sleeve through water drainage pipes; the inner wall of the water distribution sleeve is provided with a water distribution ring groove communicated with the water distribution hole, a water passing hole penetrating through the water distribution shaft is arranged on the water distribution shaft corresponding to the water distribution ring groove, and the lower end of the water distribution shaft is provided with a connecting hole communicated with the water passing hole and used for connecting the inner washing structure or the outer washing structure; the core on the top of water distribution shaft is provided with and is convenient for the internal spline hole that the output shaft of motor inserted, the outer wall of water distribution shaft is provided with a plurality of sealed annulars that are used for preventing the sealing washer.
Preferably, the limiting structure comprises an upper positioning ring arranged at the lower end of the cylinder cover and extending into the inner wall of the filter cylinder and a lower positioning ring connected with the lower end of the separation cylinder through a plurality of supporting blocks, and the upper end of the lower positioning ring is provided with a positioning ring groove matched with the outer wall of the filter cylinder; and the lower end of the lower positioning ring is provided with a flow guide cone.
Preferably, the barrel cover is provided with a first transition annular plate which is convenient for connecting the water distribution sleeve and corresponds to the inner flushing mechanism, and a second transition annular plate which is convenient for connecting the water distribution sleeve and corresponds to the outer flushing mechanism.
Preferably, the filter cartridge comprises an inner filter cartridge, an outer filter cartridge and a filter screen arranged between the inner filter cartridge and the outer filter cartridge, the outer walls of the inner filter cartridge and the outer filter cartridge are provided with a plurality of water passing through holes, the upper end of the water outlet pipe is inserted into the inner cavity of the filter cartridge, and an elastic sealing ring is arranged between the water outlet pipe and the filter cartridge.
Preferably, the number of the outer washing mechanisms is at least 3, and the outer washing mechanisms are uniformly distributed in an annular array; the inner washing structure comprises a first shunt pipe, a plurality of first branch pipes and spray heads, the first branch pipes are arranged on one side of the first shunt pipe, the spray heads are arranged at the end portions of the first branch pipes, the outer washing structure comprises a second shunt pipe, a plurality of second branch pipes and spray heads, the second branch pipes are arranged on one side of the second shunt pipe, and the spray heads are arranged at the end portions of the second branch pipes.
Preferably, the sewage draining port is provided with a sewage draining valve, and the water outlet pipe is provided with a water draining valve.
Advantageous effects
Compared with the prior art, the utility model provides a waste water treatment filtration system possesses following beneficial effect:
the sewage is subjected to the centrifugal separation action of the centrifugal separation cylinder, so that solid impurities slide into the bottom of the conical cylinder along the inner wall of the separation cylinder, the quantity of the fixed impurities accumulated on the surface of the filter screen is reduced, the filtering efficiency is improved, and the maintenance interval time of the filter screen is prolonged; the inner washing mechanism is arranged to facilitate washing of the inner cavity of the filter screen during washing, and the plurality of outer washing mechanisms are arranged to facilitate washing of the outer wall of the filter screen and the inner wall of the separation cylinder during washing, so that the labor intensity of workers in maintaining the filter screen is reduced; and the water distribution mechanism of the inner flushing mechanism and the water distribution mechanism of the outer flushing mechanism are provided with transparent observation boxes, so that the flushing liquid at the leaking position in the water drain hole can be observed, and workers can know the water leaking condition in time.
Drawings
FIG. 1 is a schematic view of the overall system of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention;
fig. 3 is a schematic structural view of the water distribution mechanism of the present invention;
fig. 4 is a schematic view of the overall structure of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: a wastewater treatment filtering system comprises a centrifugal wastewater filtering device 1 and a cleaning device 2;
the centrifugal wastewater filtering device 1 comprises a separating cylinder 11, a cylinder cover 12 arranged at the upper end of the separating cylinder 11 and a filter cylinder 13 arranged between the separating cylinder 11 and the cylinder cover 12 through a limiting structure; a water inlet pipe 14 tangent to the inner wall of the separation barrel 11 is arranged on one side of the upper part of the separation barrel 11, a water outlet pipe 15 communicated with the inner cavity of the filter barrel 13 is arranged on the lower part of the separation barrel, a sewage discharge outlet 16 is arranged at the lower end of the separation barrel, sewage enters from the side wall of one side of the upper part of the separation barrel in the tangential direction, when the sewage in the separation barrel is discharged from the water outlet pipe at the bottom of the filter barrel, inlet water makes circular motion under the guiding action of the inner wall of the separation barrel and makes downward spiral motion in the separation barrel under the action of gravity, so that a vortex is formed, wherein solid impurities in the sewage rapidly settle to the bottom of the separation barrel under the action of centrifugal force, and only a small amount of solid impurities;
the cleaning device 2 comprises an inner washing mechanism 21, a plurality of outer washing mechanisms 22, a water tank 23, a water pump 24 and a water pump motor, wherein the inner washing mechanism 21 and the plurality of outer washing mechanisms 22 are arranged on the cylinder cover 12;
the inner flushing mechanism 21 comprises a water distribution sleeve 211 arranged at the top of the barrel cover 12, a water distribution shaft 212 rotatably arranged in the water distribution sleeve 211, a motor 213 arranged at the top of the water distribution sleeve 211 and used for driving the water distribution shaft 212 to rotate, and a detachable inner flushing structure 214 arranged at the lower end of the water distribution shaft 212, wherein the motor drives the inner flushing structure at the lower end of the water distribution shaft to rotate, so that the inner flushing structure rotationally flushes the inner cavity of the flushing filter screen, the flushing range of the inner flushing structure is expanded, and the inner flushing structure can flush the inner cavity of the filter screen in all directions;
In a preferred embodiment, the water distribution sleeve 211 is provided with a water distribution hole 214 at a middle portion of one side for connecting the water inlet pipe 14, and a water drainage hole 215 at an upper portion of the other side for preventing water from leaking to the motor 213.
As a preferred embodiment, a transparent observation box 25 is arranged on the top of the water tank 23, the top of the observation box 25 is communicated with a plurality of drainage holes 215 of the water distribution sleeve 211 through a drainage pipe 26, when the flushing liquid leaks from the drainage holes, the flushing liquid is guided into the observation box through the drainage pipe, and a worker can observe whether the water leakage occurs through the transparent observation box; the inner wall of the water distribution sleeve 211 is provided with a water distribution ring groove 215 communicated with the water distribution hole 214, a water passing hole 217 penetrating through the water distribution shaft 212 is arranged on the water distribution shaft 212 corresponding to the water distribution ring groove 216, the lower end of the water distribution shaft is provided with a connecting hole communicated with the water passing hole 217 and used for connecting the inner flushing structure 218 or the outer flushing structure 221, flushing liquid enters from the water distribution hole and then enters into the water passing hole of the water distribution shaft through the water distribution ring groove, and the arrangement of the water distribution ring groove can ensure that the flushing liquid can still enter into the water passing hole when the water distribution shaft rotates; the core on the top of water distribution shaft 212 is provided with and is convenient for motor 213's output shaft male internal spline hole, the outer wall of water distribution shaft 212 is provided with a plurality of sealed annulars that are used for preventing the sealing washer, in the preferred embodiment, sets up five sealing washers, the three upper end that is located the water hole, the annular position that the outlet is located the water distribution shaft from top down first sealing washer and second sealing washer between at the position of the inner wall of water distribution cover corresponds the department, through setting up the outlet, after preventing the sealing washer inefficacy, the flush fluid gets into bearing or motor department, influences the life of bearing.
As a preferred embodiment, the limiting structure comprises an upper positioning ring 17 arranged at the lower end of the cover 12 and extending into the inner wall of the filter cartridge 13, and a lower positioning ring 18 connected with the lower end of the separation cartridge 11 through a plurality of supporting blocks, wherein the upper end of the lower positioning ring 18 is provided with a positioning ring groove matched with the outer wall of the filter cartridge 13, and the filter cartridge is fixed through the cooperation of the upper positioning ring and the lower positioning ring, so that the stability of the filter cartridge can be increased, and the filter cartridge is prevented from swinging left and right due to sewage impact; the lower end of the lower positioning ring 18 is provided with a flow guide cone 19 for guiding settled solid impurities away from the filter screen, so that smaller particles in the solid impurities are prevented from being brought to the filter screen again due to disturbance of water flow and are accumulated on the surface of the bottom of the filter screen.
As a preferred embodiment, the barrel cover 12 is provided with a first transition ring plate corresponding to the inner flushing mechanism 21 and facilitating connection with the water distribution sleeve, and a second transition ring plate corresponding to the outer flushing mechanism 22 and facilitating connection with the water distribution sleeve, the first transition ring plate and the second transition ring plate, so that the barrel cover does not need to be detached during maintenance of the flushing mechanism, labor intensity of workers is reduced, and maintenance is facilitated.
As a preferred embodiment, the filter cartridge 13 includes an inner filter cartridge, an outer filter cartridge and a filter screen disposed between the inner filter cartridge and the outer filter cartridge, the inner and outer filter cartridges serve as a skeleton of the filter screen, thereby improving the rigidity of the filter cartridge, and simultaneously blocking larger impurities from the outside of the outer filter cartridge, the upper end of the water outlet pipe is inserted into the inner cavity of the filter cartridge 13, and an elastic sealing ring is disposed between the water outlet pipe and the filter cartridge 13.
As a preferred embodiment, the number of the outer washing mechanisms 22 is at least 3, and the outer washing mechanisms are uniformly distributed in an annular array; interior washing structure 218 includes first shunt tubes, sets up a plurality of first branch pipes of one side of first shunt tubes and sets up the shower nozzle of the tip of first branch pipe, outer washing structure 221 includes second shunt tubes, sets up a plurality of second branch pipes of one side of second shunt tubes and sets up the tip of second branch pipes the shower nozzle, the flush fluid in the water distribution axle gets into behind the shunt tubes, flows into each branch pipe to spray away through the shower nozzle.
As a preferred embodiment, the sewage draining outlet 16 is provided with a sewage draining valve, the water outlet pipe 15 is provided with a water draining valve, sewage containing solid impurities deposits is drained through the sewage draining outlet, and purified water is drained through the water outlet pipe.
It is to be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or operations, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus, without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A wastewater treatment filtration system, characterized in that: comprises a centrifugal wastewater filtering device and a cleaning device;
the centrifugal wastewater filtering device comprises a separating cylinder, a cylinder cover arranged at the upper end of the separating cylinder and a filter cylinder arranged between the separating cylinder and the cylinder cover through a limiting structure; a water inlet pipe tangent to the inner wall of the separating cylinder is arranged on one side of the upper part of the separating cylinder, a water outlet pipe communicated with the inner cavity of the filter cylinder is arranged on the lower part of the separating cylinder, and a sewage outlet is arranged at the lower end of the separating cylinder;
the cleaning device comprises an inner washing mechanism, a plurality of outer washing mechanisms, a water tank, a water pump and a water pump motor, wherein the inner washing mechanism and the plurality of outer washing mechanisms are arranged on the cylinder cover;
the inner flushing mechanism comprises a water distribution sleeve arranged at the top of the barrel cover, a water distribution shaft rotatably arranged in the water distribution sleeve, a motor arranged at the top of the water distribution sleeve and used for driving the water distribution shaft to rotate, and a detachable inner flushing structure arranged at the lower end of the water distribution shaft;
the outer washing mechanism comprises a water distribution sleeve arranged at the top of the barrel cover, a water distribution shaft rotatably arranged in the water distribution sleeve, a motor arranged at the top of the water distribution sleeve and used for driving the water distribution shaft to rotate, and a detachable outer washing structure arranged at the lower end of the water distribution shaft.
2. The wastewater treatment filtering system according to claim 1, wherein the water distribution sleeve is provided with a water distribution hole for connecting the water inlet pipe in the middle of one side and a water drainage hole for preventing water from leaking to the motor in the upper part of the other side.
3. The wastewater treatment filtering system according to claim 2, wherein a transparent observation box is arranged at the top of the water tank, and the top of the observation box is communicated with a plurality of drainage holes of the water distribution sleeve through drainage pipes; the inner wall of the water distribution sleeve is provided with a water distribution ring groove communicated with the water distribution hole, a water passing hole penetrating through the water distribution shaft is arranged on the water distribution shaft corresponding to the water distribution ring groove, and the lower end of the water distribution shaft is provided with a connecting hole communicated with the water passing hole and used for connecting the inner washing structure or the outer washing structure; the core on the top of water distribution shaft is provided with and is convenient for the internal spline hole that the output shaft of motor inserted, the outer wall of water distribution shaft is provided with a plurality of sealed annulars that are used for preventing the sealing washer.
4. The wastewater treatment filtering system according to any one of claims 1 to 3, wherein the limiting structure comprises an upper positioning ring arranged at the lower end of the cartridge cover and extending into the inner wall of the filter cartridge, and a lower positioning ring connected with the lower end of the separation cartridge through a plurality of supporting blocks, and the upper end of the lower positioning ring is provided with a positioning ring groove matched with the outer wall of the filter cartridge; and the lower end of the lower positioning ring is provided with a flow guide cone.
5. The wastewater treatment filtering system according to any one of claims 1 to 3, wherein the cartridge cover is provided with a first transition ring plate corresponding to the inner flushing mechanism for facilitating connection with the water distribution sleeve, and a second transition ring plate corresponding to the outer flushing mechanism for facilitating connection with the water distribution sleeve.
6. The wastewater treatment filtering system according to any one of claims 1 to 3, wherein the filter cartridge comprises an inner filter cartridge, an outer filter cartridge and a filter screen arranged between the inner filter cartridge and the outer filter cartridge, the outer walls of the inner filter cartridge and the outer filter cartridge are provided with a plurality of water passing through holes, the upper end of the water outlet pipe is inserted into the inner cavity of the filter cartridge, and an elastic sealing ring is arranged between the water outlet pipe and the filter cartridge.
7. A wastewater treatment filtration system according to any one of claims 1 to 3, wherein said external flushing means are at least 3 in number and are uniformly distributed in an annular array; the inner washing structure comprises a first shunt pipe, a plurality of first branch pipes and spray heads, the first branch pipes are arranged on one side of the first shunt pipe, the spray heads are arranged at the end portions of the first branch pipes, the outer washing structure comprises a second shunt pipe, a plurality of second branch pipes and spray heads, the second branch pipes are arranged on one side of the second shunt pipe, and the spray heads are arranged at the end portions of the second branch pipes.
8. A waste water treatment filtration system according to any one of claims 1 to 3, wherein the waste outlet is provided with a waste valve and the outlet pipe is provided with a drain valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922154725.7U CN211706066U (en) | 2019-12-04 | 2019-12-04 | Wastewater treatment filtration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922154725.7U CN211706066U (en) | 2019-12-04 | 2019-12-04 | Wastewater treatment filtration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211706066U true CN211706066U (en) | 2020-10-20 |
Family
ID=72816872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922154725.7U Expired - Fee Related CN211706066U (en) | 2019-12-04 | 2019-12-04 | Wastewater treatment filtration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211706066U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709286A (en) * | 2020-12-23 | 2021-04-27 | 苏州础润生态科技有限公司 | Rainwater collecting water storage device and using method thereof |
| CN114733238A (en) * | 2022-04-26 | 2022-07-12 | 青海省农林科学院 | Novel sewage filters device |
-
2019
- 2019-12-04 CN CN201922154725.7U patent/CN211706066U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709286A (en) * | 2020-12-23 | 2021-04-27 | 苏州础润生态科技有限公司 | Rainwater collecting water storage device and using method thereof |
| CN114733238A (en) * | 2022-04-26 | 2022-07-12 | 青海省农林科学院 | Novel sewage filters device |
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| 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: 20201020 |