CN113877267A - Sewage treatment filter screen backflushing device - Google Patents
Sewage treatment filter screen backflushing device Download PDFInfo
- Publication number
- CN113877267A CN113877267A CN202111278919.3A CN202111278919A CN113877267A CN 113877267 A CN113877267 A CN 113877267A CN 202111278919 A CN202111278919 A CN 202111278919A CN 113877267 A CN113877267 A CN 113877267A
- Authority
- CN
- China
- Prior art keywords
- backflushing
- pipe
- shell
- sewage
- filter screen
- 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.)
- Granted
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims 5
- 239000011324 bead Substances 0.000 claims 1
- 239000008213 purified water Substances 0.000 abstract description 20
- 239000012535 impurity Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention relates to a backflushing device for a sewage treatment filter screen, which effectively solves the problem of blockage of the sewage filter screen; the technical scheme includes that the device comprises a sewage tank, a purified water tank and a cylindrical shell, wherein a sewage inlet connected with the sewage tank is arranged at the left end of the shell, a purified water outlet connected with the purified water tank is arranged on the side wall of the shell, the purified water outlet is close to the right end of the shell and is spaced from the right end of the shell, a filtering assembly is arranged in the shell, a backflushing blow-off pipe is fixed at the center of the filtering assembly, the right end of the backflushing blow-off pipe penetrates out of the shell, the filtering assembly can seal the purified water outlet after passing through the purified water outlet rightwards, the left end of the backflushing blow-off pipe is opened to backflush a filter screen, the right end of the backflushing blow-off pipe is connected with a backflow pipe through a hose, the backflow pipe is communicated with the sewage tank, and backflushing water flows into the sewage tank to be filtered again; the invention backflushs the filter screen after each filtration cycle, so that the filter screen can be kept permeable all the time.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a backflushing device for a sewage treatment filter screen.
Background
Solid pollutants, chemical pollutants and the like exist in sewage, the solid pollutants are generally removed through a physical filtering means, then the chemical pollutants are removed through a chemical reaction means, when the sewage is filtered, impurities can be adhered to the sewage side of the filter screen to block the filter screen, and particularly, the filter screen can be quickly blocked when sewage with a large number of floccule filaments is produced;
at present, a filter screen is generally dredged by a regular backflushing mode, but impurities can form stubborn concretions, particularly floccules and filaments if deposited on the filter screen for a long time, and if the impurities are not removed in time, the impurities can be wound in meshes of the filter screen and are difficult to wash away during backflushing; some equipment can be provided with two groups of filtering units for switching, so that non-stop backflushing is realized, but the equipment volume is increased undoubtedly, only one filtering unit is in a working state, and the utilization rate is low; furthermore, when the existing backflushing equipment performs backflushing, the backflushing flow at each position of the filter screen is uneven, backflushing water can preferentially pass through an area with good permeability, the flow of an area with serious blockage is smaller, and backflushing and boosting are difficult.
Disclosure of Invention
The invention provides a backflushing device for a sewage treatment filter screen, and aims to solve the problem of blockage of a sewage filter screen.
The technical scheme for solving the problem is that the backflushing device for the sewage treatment filter screen comprises a sewage tank, a clean water tank and a cylindrical shell, wherein the left end of the shell is provided with a sewage inlet connected with the sewage tank, the sewage inlet is provided with a water inlet one-way valve, the side wall of the shell is provided with a clean water outlet connected with the clean water tank, the clean water outlet is provided with a water outlet one-way valve, and the clean water outlet is close to the right end of the shell and is a distance away from the right end of the shell; a sleeve which is attached to the inner wall of the shell and can reciprocate left and right is arranged in the shell, a filter screen and a piston positioned on the left side of the filter screen are arranged in the sleeve, a liquid passing hole is formed in the piston, a liquid passing one-way valve which enables water to flow through the liquid passing hole from left to right is arranged in the liquid passing hole, and a spring is arranged on the left side of the piston; a horizontal backflushing blow-off pipe is fixed in the center of the filter screen, the left end of the backflushing blow-off pipe extends to the left side of the filter screen, the right end of the backflushing blow-off pipe penetrates out of the shell, a blind hole is formed in the right end face of the piston, when the piston is located at the rightmost position, the left end of the backflushing blow-off pipe extends into the blind hole, the left port of the backflushing blow-off pipe is sealed when the backflushing blow-off pipe extends into the blind hole, and after the piston moves leftwards relative to the sleeve, the left end of the backflushing blow-off pipe can be pulled out of the blind hole; the right end of the back flushing sewage discharge pipe is connected with a return pipe through a hose, the return pipe is communicated with the sewage tank, and the back flushing water flows back into the sewage tank for secondary filtration.
The left end of the sleeve is fixedly provided with a push rod which extends out of the shell to the left, the left side of the shell is provided with a rotary table, a short rod which is vertical to the disc surface is fixed at the non-circle center position of the disc surface of the rotary table, the left end of the push rod is fixedly provided with a sliding groove which is vertical to the push rod, and the short rod is arranged in the sliding groove.
And sealing rings are arranged on the outer wall of the sleeve, at the position where the backflushing sewage discharge pipe at the right end of the shell passes through and at the position where the push rod at the left end of the shell passes through.
The return pipe is vertically arranged at one section of the right end of the shell, and the lower end of the return pipe is provided with an openable end cover through threads.
The backflow pipe is internally provided with a small ball, the inner wall of the backflow pipe is provided with a limiting block, the small ball falls on the limiting block when no water flows exist in the backflow pipe, and the connecting position of the hose and the backflow pipe is located between the limiting block and the end cover.
The diameter of the small ball is 2 to 4 mm smaller than the inner diameter of the return pipe.
The density of the pellets is between 1.1 and 1.3.
The small ball is in the form of a hollow metal ball, a through hole communicated with the inner cavity of the small ball is formed in the small ball, and the through hole is sealed by a screw.
And a sealing gasket is arranged at the bottom of the blind hole.
The left and right sides of filter screen all install the support frame.
The invention carries out backflushing on the filter screen after each filtering cycle, can lead the filter screen to be always transparent, and has a pressure boosting and force storing process before backflushing, thus leading the pressure at all positions of the filter screen to be evenly distributed and improving the backflushing pressure difference.
Drawings
Figure 1 is a front cross-sectional view of the present invention with the sleeve at the far left end.
Fig. 2 is a front sectional view of the invention when the cartridge is moved to close the clean water outlet.
Fig. 3 is a front sectional view of the present invention when the left end of the backflushing drain is opened.
FIG. 4 is a front cross-sectional view of the present invention with the sleeve moved to the far right end at the end of the recoil.
Fig. 5 is an enlarged view of the position a in fig. 1.
Fig. 6 is an enlarged view of the position B in fig. 3.
Fig. 7 is an enlarged view of the position C in fig. 3.
Fig. 8 is an end view of the support bracket.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The invention comprises a sewage tank 1, a purified water tank 2 and a cylindrical shell 3, wherein the left end of the shell 3 is provided with a sewage inlet 4 connected with the sewage tank 1, the sewage inlet 4 is provided with a water inlet one-way valve 5, the side wall of the shell 3 is provided with a purified water outlet 6 connected with the purified water tank 2, the purified water outlet 6 is provided with a water outlet one-way valve 7, and the purified water outlet 6 is close to the right end of the shell 3 and is spaced from the right end of the shell 3; a sleeve 8 which is attached to the inner wall of the shell 3 and can move left and right in a reciprocating manner is arranged in the shell 3, a filter screen 9 and a piston 10 which is positioned on the left side of the filter screen 9 are arranged in the sleeve 8, a liquid passing hole 11 is formed in the piston 10, a liquid passing one-way valve which enables water to flow through the liquid passing hole 11 from left to right is arranged in the liquid passing hole 11, and a spring 13 is arranged on the left side of the piston 10; when the sleeve 8 moves leftwards, sewage on the left side of the piston 10 is pressed into the right side of the filter screen 9 through the liquid hole 11 and the filter screen 9, when the shell 3 moves rightwards, the piston 10 discharges purified water on the right side of the piston from the purified water outlet 6, meanwhile, the piston 10 sucks the sewage on the left side, and the sleeve 8 reciprocates to realize continuous filtering operation; a horizontal backflushing blow-off pipe 14 is fixed at the center of the filter screen 9, the left end of the backflushing blow-off pipe 14 extends to the left side of the filter screen 9, the right end of the backflushing blow-off pipe 14 penetrates out of the shell 3, a blind hole 15 is formed in the right end face of the piston 10, when the piston 10 is located at the rightmost position, the left end of the backflushing blow-off pipe 14 extends into the blind hole 15, the left port of the backflushing blow-off pipe 14 is sealed when the backflushing blow-off pipe 14 extends into the blind hole 15, and after the piston 10 moves leftwards relative to the sleeve 8, the left end of the backflushing blow-off pipe 14 can be pulled out of the blind hole 15; when the sleeve 8 moves on the left side of the purified water outlet 6, no matter the sleeve moves leftwards or rightwards, under the action of the right elasticity of the spring 13, the piston 10 is positioned at the left end of the rightmost backflushing sewage discharge pipe 14 and extends into the blind hole 15, the backflushing passage is closed, when the sleeve 8 moves rightwards to close the purified water outlet 6, water on the right side of the piston 10 cannot be discharged from the purified water outlet 6 any more when the sleeve 8 moves rightwards continuously, so that the water pressure on the right side of the piston 10 will rise, the piston 10 is gradually pushed leftwards, finally, the left end of the backflushing sewage discharge pipe 14 is pulled out from the blind hole 15, and the sleeve 8 moves rightwards continuously to discharge the water backflushing filter screen 9 on the right side and then the backflushing sewage discharge pipe 14; the right end of the backflushing sewage discharge pipe 14 is connected with a return pipe 16 through a hose 17, the return pipe 16 is communicated with the sewage tank 1, and the backflushing water flows back into the sewage tank 1 for secondary filtration.
The left end of the sleeve 8 is fixedly provided with a push rod 18 extending out of the shell 3 to the left, the left side of the shell 3 is provided with a rotary table 19, a short rod 20 vertical to the disc surface is fixed at the non-circle center position of the disc surface of the rotary table 19, the left end of the push rod 18 is fixedly provided with a sliding groove 21 vertical to the push rod 18, the short rod 20 is arranged in the sliding groove 21, and when the rotary table 19 rotates, the push rod 18 and the sleeve 8 are pulled to reciprocate left and right through the short rod 20 and the sliding groove 21.
And sealing rings 22 are respectively arranged on the outer wall of the sleeve 8, the position where the backflushing sewage discharge pipe 14 at the right end of the shell 3 passes through and the position where the push rod 18 at the left end of the shell 3 passes through, so that the sealing performance of the sliding fit position is ensured.
The return pipe 16 is vertically arranged at a section of the right end of the shell 3, an openable end cover 23 is installed at the lower end of the return pipe 16 through threads, and impurities deposited in the return pipe 16 can be discharged by opening the end cover 23.
A small ball 24 is arranged in the return pipe 16, a limiting block 25 is arranged on the inner wall of the return pipe 16, the small ball 24 falls on the limiting block 25 when no water flows in the return pipe 16, and the connecting position of the hose 17 and the return pipe 16 is positioned between the limiting block 25 and the end cover 23; during backflushing, the small ball 24 is pushed by the backflushing water to move upwards, water on the upper side of the small ball 24 is discharged into the sewage tank 1, when the backflushing is finished, the small ball 24 slowly descends, meanwhile, impurities in the backflushing water below the small ball 24 settle at the bottom of the backflow pipe 16, after the small ball 24 falls to the bottom, water which is primarily settled is above the small ball 24, and during next backflushing, the small ball 24 can prevent the non-settled backflushing water and the backflushing water which is settled by the upper wheel from being mixed in a large amount, so that the impurities are prevented from being flushed back into the sewage tank 1 in a large amount.
The diameter of the small ball 24 is 2 to 4 mm smaller than the inner diameter of the return pipe 16, so that the small ball 24 can float up and down freely in the return pipe 16, and the water on the upper side and the lower side of the small ball 24 can be effectively prevented from being mixed greatly.
The density of the small balls 24 is between 1.1 and 1.3, namely, the density is slightly larger than that of water, so that the small balls 24 slowly sink after the back flushing is finished, and sufficient settling time is provided for the back flushing water on the lower side.
The small ball 24 is in the form of a hollow metal ball, a through hole communicated with the inner cavity of the small ball 24 is formed in the small ball 24, the through hole is sealed by a screw, and water can be added into the inner cavity of the small ball 24 by unscrewing the screw, so that the specific gravity of the small ball 24 is adjusted, and the falling speed of the small ball is controlled.
The bottom of the blind hole 15 is provided with a sealing gasket 26, so that the left end of the backflushing sewage discharge pipe 14 is effectively sealed when extending into the blind hole 15.
The left side and the right side of the filter screen 9 are both provided with a support frame 27 to keep the rigidity of the filter screen 9.
The specific working process of the invention is as follows:
starting the rotary disc 19, the rotary disc 19 pulls the sleeve 8 to reciprocate left and right through the push rod 18, when the sleeve 8 moves rightwards, the left side of the piston 10 sucks sewage from the sewage tank 1, when the sleeve 8 moves leftwards, the sewage on the left side is pressed to the right side through the liquid hole 11 and the filter screen 9 to be filtered, and when the piston 10 moves rightwards again, the clean water on the right side is discharged through the clean water outlet 6; when the sleeve 8 moves on the left side of the purified water outlet 6, no matter the sleeve moves leftwards or rightwards, under the action of the right elasticity of the spring 13, the piston 10 is positioned at the rightmost position, the left end of the backflushing sewage discharge pipe 14 extends into the blind hole 15, the left end of the backflushing sewage discharge pipe 14 is sealed, and a backflushing sewage discharge passage is not opened.
When the sleeve 8 moves rightwards to seal the purified water outlet 6, water on the right side of the piston 10 can not be discharged from the purified water outlet 6 due to continuous rightward movement, water pressure on the right side of the piston 10 can rise, the piston 10 is gradually pushed leftwards, finally, the left end of the backflushing sewage discharge pipe 14 can be pulled out from the blind hole 15, so that the left end of the backflushing sewage discharge pipe 14 is opened, the sleeve 8 continuously moves rightwards again, water on the right side of the filter screen 9 can be pressed to the backflushing filter screen 9 on the left side of the filter screen 9 and then is discharged from the backflushing sewage discharge pipe 14, and water in the backflushing sewage discharge pipe 14 flows back to the sewage tank 1 through the return pipe 16 to be filtered again.
In the process, after the purified water outlet 6 is sealed, the spring 13 is compressed when the piston 10 moves left relative to the sleeve 8, the water pressure on the right side of the piston 10 is increased, the pressure on each part of the filter screen 9 is uniformly increased to a high value, which is equivalent to a boosting and force-storing process, when the backflushing sewage discharge pipe 14 is opened, the pressure on the left side of the filter screen 9 is reduced, the backflushing is always maintained at a high pressure difference, and the backflushing effect is ensured.
The sleeve 8 moves to the rightmost end and then returns back to move leftwards, the piston 10 moves back to the right under the action of the spring 13, and the left end of the backflushing sewage discharge pipe 14 is closed.
In the invention, at the end of each filtration and drainage, the sleeve 8 seals the clean water outlet 6, the backflushing blow-off pipe 14 is opened by the left movement of the piston 10, the clean water drainage passage is switched to the backflushing passage, a small part of clean water is used for backflushing the impurities which are filtered and deposited on the filter screen 9 at this time, the impurities can be prevented from being deposited on the filter screen 9 for a long time to form stubborn concretions, the filter screen 9 can be kept permeable constantly, and the filtration efficiency is improved.
In addition, before backflushing, the piston 10 moves leftwards and the spring 13 is compressed, so that a boosting and force-storing process is arranged on the right side of the piston 10, a higher backflushing pressure difference is formed on two sides of the filter screen 9 after a sewage discharge channel on the left side of the filter screen 9 is communicated, pressure at each part of the filter screen 9 is uniformly distributed, the problem that the pressure and flow at the blockage part of the filter screen 9 are difficult to raise is solved, and the backflushing effect is improved.
Claims (10)
1. A sewage treatment filter screen backflushing device comprises a sewage tank (1), a water purification tank (2) and a cylindrical shell (3), and is characterized in that a sewage inlet (4) connected with the sewage tank (1) is arranged at the left end of the shell (3), a water inlet one-way valve (5) is arranged on the sewage inlet (4), a water purification outlet (6) connected with the water purification tank (2) is arranged on the side wall of the shell (3), a water outlet one-way valve (7) is arranged on the water purification outlet (6), and the water purification outlet (6) is close to the right end of the shell (3) and is away from the right end of the shell (3); a sleeve (8) which is attached to the inner wall of the shell (3) and can move left and right in a reciprocating manner is arranged in the shell (3), a filter screen (9) and a piston (10) which is positioned on the left side of the filter screen (9) are arranged in the sleeve (8), a liquid passing hole (11) is formed in the piston (10), a liquid passing one-way valve which enables water to flow through the liquid passing hole (11) from left to right is arranged in the liquid passing hole (11), and a spring (13) is arranged on the left side of the piston (10); a horizontal backflushing blow-off pipe (14) is fixed at the center of the filter screen (9), the left end of the backflushing blow-off pipe (14) extends to the left side of the filter screen (9), the right end of the backflushing blow-off pipe penetrates out of the shell (3), a blind hole (15) is formed in the right end face of the piston (10), when the piston (10) is located at the rightmost position, the left end of the backflushing blow-off pipe (14) extends into the blind hole (15), the left port of the backflushing blow-off pipe (14) is sealed when the backflushing blow-off pipe (14) extends into the blind hole (15), and after the piston (10) moves leftwards relative to the sleeve (8), the left end of the backflushing blow-off pipe (14) can be pulled out of the blind hole (15); the right end of the backflushing sewage discharge pipe (14) is connected with a return pipe (16) through a hose (17), the return pipe (16) is communicated with the sewage tank (1), and the backflushing water flows back into the sewage tank (1) for secondary filtration.
2. A sewage treatment screen backflushing device according to claim 1, wherein a push rod (18) extending out of the housing (3) leftward is fixed at the left end of the sleeve (8), a rotary table (19) is arranged at the left side of the housing (3), a short rod (20) perpendicular to the disc surface is fixed at a non-circular center position of the disc surface of the rotary table (19), a sliding groove (21) perpendicular to the push rod (18) is fixed at the left end of the push rod (18), and the short rod (20) is arranged in the sliding groove (21).
3. The backflushing device for the sewage treatment screen according to claim 1, wherein the outer wall of the sleeve (8), the position where the backflushing sewage discharge pipe (14) at the right end of the shell (3) passes through and the position where the push rod (18) at the left end of the shell (3) passes through are all provided with sealing rings (22).
4. A sewage treatment screen backflushing device according to claim 1 wherein the return pipe (16) is located vertically at a section of the right end of the housing (3), the lower end of the return pipe (16) being threaded with an openable end cap (23).
5. The sewage treatment screen backflushing device according to claim 1, wherein a small ball (24) is installed in the backflow pipe (16), a limiting block (25) is arranged on the inner wall of the backflow pipe (16), the small ball (24) falls on the limiting block (25) when no water flows in the backflow pipe (16), and the connection position of the hose (17) and the backflow pipe (16) is located between the limiting block (25) and the end cover (23).
6. A sewage treatment screen backflush device according to claim 5, wherein the diameter of the ball (24) is 2 to 4 mm smaller than the inner diameter of the return pipe (16).
7. A sewage treatment screen backflush device according to claim 5, wherein the density of the beads (24) is between 1.1 and 1.3.
8. The backflushing device according to claim 5, wherein the small ball (24) is in the form of a hollow metal ball, a through hole communicated with an inner cavity of the small ball (24) is formed in the small ball, and the through hole is blocked by a screw.
9. A sewage treatment screen backflushing device according to claim 1 wherein the bottom of the blind hole (15) is fitted with a gasket (26).
10. A sewage treatment screen backflushing device according to claim 1 wherein the left and right sides of the screen (9) are each fitted with a support bracket (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278919.3A CN113877267B (en) | 2021-10-31 | 2021-10-31 | Sewage treatment filter screen recoil device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278919.3A CN113877267B (en) | 2021-10-31 | 2021-10-31 | Sewage treatment filter screen recoil device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113877267A true CN113877267A (en) | 2022-01-04 |
| CN113877267B CN113877267B (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111278919.3A Active CN113877267B (en) | 2021-10-31 | 2021-10-31 | Sewage treatment filter screen recoil device |
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| Country | Link |
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| CN (1) | CN113877267B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445300A (en) * | 2022-08-15 | 2022-12-09 | 中核核电运行管理有限公司 | Nuclear power plant main pump shaft seal water riser reciprocating flushing type corrosion product discharging device |
| CN117085391A (en) * | 2023-10-20 | 2023-11-21 | 深圳市壹格锐科技有限公司 | Self-cleaning sewage filtering device |
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| CN117085391B (en) * | 2023-10-20 | 2024-01-12 | 深圳市壹格锐科技有限公司 | Self-cleaning sewage filtering device |
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| CN113877267B (en) | 2022-11-25 |
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