CN109513251B - Automatic jet cleaning filter - Google Patents
Automatic jet cleaning filter Download PDFInfo
- Publication number
- CN109513251B CN109513251B CN201811472277.9A CN201811472277A CN109513251B CN 109513251 B CN109513251 B CN 109513251B CN 201811472277 A CN201811472277 A CN 201811472277A CN 109513251 B CN109513251 B CN 109513251B
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- CN
- China
- Prior art keywords
- strip
- filter screen
- shaped
- nozzle
- suction nozzle
- 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.)
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Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000010865 sewage Substances 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 2
- 238000010924 continuous production Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 9
- 239000012535 impurity Substances 0.000 description 9
- 238000000746 purification Methods 0.000 description 4
- 239000013535 sea water Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
- B01D29/56—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 multiple filtering elements, characterised by their mutual disposition in series connection
- B01D29/58—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 multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
-
- 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
- B01D29/11—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 bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- 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
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
-
- 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
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
-
- 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
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention relates to an automatic jet cleaning filter, which comprises a middle shell, wherein an upper end cover and a lower end cover are arranged on the middle shell, a rotary table is arranged on the lower side of the upper end cover, an inner filter screen and an outer filter screen are arranged on the rotary table, a first suction system is arranged at the inner filter screen and comprises a first strip-shaped suction nozzle and a first strip-shaped nozzle, the first strip-shaped suction nozzle and the first strip-shaped nozzle are respectively positioned at the inner side and the outer side of the inner filter screen, a second suction system is arranged at the outer filter screen and comprises a second strip-shaped suction nozzle and a second strip-shaped nozzle, and the second strip-shaped suction nozzle and the second strip-shaped nozzle are respectively positioned at the inner side and the outer side of the outer filter screen. The invention discloses an automatic jet cleaning filter, which adopts an ultrahigh-pressure jet cleaning filter screen, can effectively ensure the stable operation of the filter, does not influence the normal operation of the filter in the cleaning process, and can meet the requirement of continuous production of the filter.
Description
Technical Field
The invention relates to an automatic jet cleaning filter, which is mainly used for separating and filtering in industrial, agricultural, municipal, sea water desalination processes and the like, and belongs to the technical field of water treatment equipment.
Background
The filtration of water is an indispensable core link in the water treatment industry, and the net type filtration is to separate and intercept impurities in water by physical means such as a filter net and the like, so as to improve the water quality. The separated impurities are easy to accumulate on the filter screen under continuous filtration, so that the impurities block the filter screen, water is difficult to pass through the filter screen, and the pressure born by the filter screen is continuously increased. In order to ensure the normal operation of the filter, the filter needs to be cleaned regularly to clear impurities on the filter screen, so that the filtering performance of the filter screen is recovered. However, for filtering high-turbidity water, the filter screen is seriously blocked due to more impurities in the water body, and the existing filter cleaning structure cannot meet the requirement of continuous operation for a long time.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic jet flow cleaning filter aiming at the prior art, which adopts an ultrahigh pressure jet flow to clean a filter screen, can effectively ensure the stable operation of the filter, does not influence the normal operation of the filter in the cleaning process, and can meet the requirement of continuous operation of the filter for a long time.
The invention solves the problems by adopting the following technical scheme: the utility model provides an automatic efflux washs filter, it includes middle casing, be provided with upper end cover and lower extreme cover on the middle casing, the upper end cover downside is provided with the carousel, be provided with interior filter screen and outer filter screen on the carousel, interior filter screen inboard is formed into first cavity, form the second cavity between interior filter screen and the outer filter screen, form the third cavity between outer filter screen and the middle casing, the lower extreme cover center is provided with turbid water import, turbid water import is linked together with first cavity, be provided with the water purification export on the middle casing, the water purification export is linked together with the third cavity, interior filter screen department is provided with first suction system, first suction system includes first bar suction nozzle and first bar nozzle, first bar suction nozzle is located the inside and outside both sides of interior filter screen respectively, outer filter screen department is provided with the second suction system, the second suction system includes second bar suction nozzle and second bar nozzle, second bar and second nozzle are located the inside and outside both sides of outer filter screen respectively.
Preferably, the turntable is driven by a motor.
Preferably, the rotary table comprises an upper rotary table and a lower rotary table, and the outer filter screen and the inner filter screen are respectively arranged on the upper rotary table and the lower rotary table.
Preferably, the second strip-shaped nozzle is mounted on the inner side of the middle housing or mounted on the middle housing from the outer side.
Preferably, a cleaning pipeline and a sewage pipeline are arranged outside the middle shell, the cleaning pipeline is connected with the first strip-shaped nozzle and the second strip-shaped nozzle respectively, and the sewage pipeline is connected with the first strip-shaped suction nozzle and the second strip-shaped suction nozzle respectively.
Preferably, the cleaning pipeline is provided with a high-pressure backwash pump, and the sewage draining pipeline is provided with a vacuum suction device.
Preferably, the cleaning pipeline inlet is connected with the middle shell or the purified water outlet.
Preferably, the two sides of the first strip-shaped suction nozzle and the second strip-shaped suction nozzle are respectively provided with a scraper, and the scrapers are propped against the inner side surface of the inner filter screen.
Preferably, baffles are arranged on two sides of the first strip-shaped nozzle and the second strip-shaped nozzle.
The utility model provides an automatic efflux washs filter, it includes middle casing, be provided with upper end cover and lower extreme cover on the middle casing, the upper end cover downside is provided with the carousel, be provided with interior filter screen and outer filter screen on the carousel, interior filter screen inboard is formed into first cavity, form the second cavity between interior filter screen and the outer filter screen, form the third cavity between outer filter screen and the middle casing, be provided with turbid water import on the middle casing, turbid water import is linked together with the third cavity, the lower extreme cover center is provided with the water purification export, the water purification export is linked together with first cavity, outer filter screen department is provided with first suction system, first suction system includes first bar nozzle and first bar nozzle, first bar nozzle is located the inside and outside both sides of outer filter screen respectively, interior filter screen department is provided with the second suction system, the second suction system includes second bar nozzle and second bar nozzle, second bar nozzle is located the inside and outside both sides respectively.
Compared with the prior art, the invention has the advantages that:
1. the invention has simple structure, can automatically clean thoroughly, avoids manual cleaning and maintenance, and greatly reduces the labor intensity of workers;
2. The invention adopts the filter screens with the inner and outer layers and the aperture smaller than 300 mu m, can effectively filter impurities in turbid water, has high filtering precision and stable water quality of effluent;
3. the ultra-high pressure jet flow is adopted to clean the filter screen, so that the filter screen is ensured to be always clean under severe working environments such as high turbidity, high impurity content and the like, the filtering area and the filtering efficiency of the filter screen are ensured, and the continuous and stable work of the filter is ensured;
4. the invention adopts the vacuum suction system, can realize the accelerated pollution discharge and greatly improve the cleaning efficiency;
5. the scrapers are arranged on the two sides of the suction nozzle, so that the filter screen can be cleaned in an auxiliary manner, and the cleaning effect of the filter screen is more effectively ensured;
6. the cleaning of the invention is continuous, does not influence the normal operation of the filter, does not lose pressure and continuously flow, and can meet the requirement of continuous operation of the filter for a long time;
7. the invention is applicable to different raw water quality, and is applicable to both seawater and fresh water, and has more advantages especially when treating water with high turbidity.
Drawings
Fig. 1 is a schematic view of an embodiment 1 of an automatic jet cleaning filter according to the present invention.
Fig. 2 is a cross-sectional view A-A of fig. 1.
Fig. 3 is a schematic view showing the structure of an embodiment 2 of an automatic jet cleaning filter according to the present invention.
Fig. 4 is a B-B cross-sectional view of fig. 3.
Wherein:
Intermediate housing 1
Upper end cap 2
Lower end cap 3
Turbid water inlet 4
Purified water outlet 5
Electric motor 6
Turntable 7
Inner filter screen 8
Outer screen 9
First cavity 10
Second cavity 11
Third cavity 12
First strip-shaped suction nozzle 13
First strip-shaped nozzle 14
Second strip-shaped suction nozzle 15
Second strip-shaped nozzle 16
Cleaning line 17
Blow-down pipeline 18
High-pressure backwash pump 19
Vacuum suction device 20
Scraper 21
A baffle 22.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Example 1:
As shown in fig. 1 and 2, an automatic jet cleaning filter in this embodiment includes a middle housing 1, an upper end cover 2 and a lower end cover 3 are respectively disposed at the top and bottom of the middle housing 1, a motor 6 is disposed on the upper end cover 2, a turntable 7 is disposed at the lower end of the motor 6, an inner filter screen 8 and an outer filter screen 9 are disposed on the turntable 7, a first cavity 10 is formed at the inner side of the inner filter screen 8, a second cavity 11 is formed between the inner filter screen 8 and the outer filter screen 9, a third cavity 12 is formed between the outer filter screen 9 and the middle housing 1, a turbid water inlet 4 is disposed at the center of the lower end cover 3, the turbid water inlet 4 is communicated with the first cavity 10, a purified water outlet 5 is disposed on the middle housing 1, a suction nozzle 5 is communicated with the third cavity 12, a first suction nozzle 13 and a first suction nozzle 14 are disposed at the inner side of the inner filter screen 8, a second nozzle 13 and a second nozzle 14 are disposed at the two sides of the second suction nozzle 14 and a second suction nozzle 15 and a suction nozzle 16 are disposed at two sides of the second suction nozzle 15 and a second suction nozzle 15 is disposed at two sides of the suction nozzle 15 and the second suction nozzle 14 is disposed at two sides of the suction nozzle 15 and the second suction nozzle 15 is disposed at two sides of the suction nozzle 14;
The pore diameters of the inner filter screen 8 and the outer filter screen 9 are smaller than 300 mu m;
The ends of the first strip-shaped suction nozzle 13, the first strip-shaped nozzle 14, the second strip-shaped suction nozzle 15 and the second strip-shaped nozzle 16 are all narrow slits, so that larger suction force or jet flow can be formed;
The second strip-shaped nozzle 16 may be mounted on the inner side of the intermediate housing 1, or may be mounted on the intermediate housing 1 from the outer side;
The lengths of the first strip-shaped suction nozzle 13 and the first strip-shaped nozzle 14 are matched with the length of the inner filter screen 8;
the lengths of the second strip-shaped suction nozzle 15 and the second strip-shaped nozzle 16 are matched with the length of the outer filter screen 9;
The first strip nozzle 14 and the second strip nozzle 15 may be made in an integral form;
A cleaning pipeline 17 and a sewage pipeline 18 are arranged outside the middle shell 1, the cleaning pipeline 17 is respectively connected with the first strip-shaped nozzle 14 and the second strip-shaped nozzle 16, and the sewage pipeline 18 is respectively connected with the first strip-shaped suction nozzle 13 and the second strip-shaped suction nozzle 15;
The cleaning pipeline 17 is provided with a high-pressure backwash pump 19;
a vacuum suction device 20 is arranged on the sewage pipeline 18;
the cleaning pipeline 17 can be cleaned by utilizing filtered water of the filter, namely, the inlet of the cleaning pipeline 17 can be connected with the middle shell 1 or the purified water outlet 5;
The two sides of the first strip-shaped suction nozzle 13 and the second strip-shaped suction nozzle 15 are respectively provided with a scraper 21, and the scrapers 21 are propped against the inner side surface of the inner filter screen 8; the scrapers 21 on the two sides of the first strip-shaped suction nozzle 13 and the second strip-shaped suction nozzle 15 can scrape off large dirt or impurities on the inner side surface of the inner filter screen 8 to prevent the suction nozzle from being blocked or blocked, and can prevent the suction nozzle from being influenced by water flow outside the scrapers when in operation to ensure that the suction nozzle can stably and effectively suck the impurities on the filter screen;
The end of the scraper 21 is provided with an elastic scraping component, such as a rubber strip, a brush and the like;
Baffles 22 are arranged on both sides of the first strip-shaped nozzle 14 and the second strip-shaped nozzle 16; the baffles on both sides of the first strip-shaped nozzle 14 and the second strip-shaped nozzle 16 can avoid the influence of water flow outside the baffles when the nozzles work, and can reduce the degree of the diffusion of jet flow at the outlet of the nozzles to the periphery.
Example 2:
As shown in fig. 3, an automatic jet cleaning filter in this embodiment comprises a middle housing 1, an upper end cover 2 and a lower end cover 3 are respectively arranged at the top and bottom of the middle housing 1, a motor 6 is arranged on the upper end cover 2, a turntable 7 is arranged at the lower end of the motor 6, an inner filter screen 8 and an outer filter screen 9 are arranged on the turntable 7, a first cavity 10 is formed at the inner side of the inner filter screen 8, a second cavity 11 is formed between the inner filter screen 8 and the outer filter screen 9, a third cavity 12 is formed between the outer filter screen 9 and the middle housing 1, a turbid water inlet 4 is arranged on the middle housing 1, the turbid water inlet 4 is communicated with the third cavity 12, a purified water outlet 5 is arranged at the center of the lower end cover 3, the water purifying outlet 5 is communicated with the first cavity 10, a first suction system is arranged at the outer filter screen 9 and comprises a first strip-shaped suction nozzle 13 and a first strip-shaped suction nozzle 14, the first strip-shaped suction nozzle 14 and the first strip-shaped suction nozzle 13 are respectively positioned at the inner side and the outer side of the outer filter screen 9, the positions of the first strip-shaped suction nozzle 13 and the first strip-shaped suction nozzle 14 are corresponding, a second suction system is arranged at the inner filter screen 8 and comprises a second strip-shaped suction nozzle 15 and a second strip-shaped suction nozzle 16, the second strip-shaped suction nozzle 16 and the second strip-shaped suction nozzle 15 are respectively positioned at the inner side and the outer side of the inner filter screen 8, and the positions of the second strip-shaped suction nozzle 15 and the second strip-shaped suction nozzle 16 are corresponding.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (2)
1. An automatic jet cleaning filter, characterized in that: it includes intermediate casing (1), be provided with upper end cover (2) and lower extreme cover (3) on intermediate casing (1), upper end cover (2) downside is provided with carousel (7), be provided with interior filter screen (8) and outer filter screen (9) on carousel (7), interior filter screen (8) inboard is formed into first cavity (10), form second cavity (11) between interior filter screen (8) and outer filter screen (9), form third cavity (12) between outer filter screen (9) and intermediate casing (1), lower extreme cover (3) center is provided with turbid water import (4), turbid water import (4) are linked together with first cavity (10), be provided with clean water export (5) on intermediate casing (1), clean water export (5) are linked together with third cavity (12), interior filter screen (8) department is provided with first suction system, first suction system includes first suction nozzle (13) and first nozzle (14), first suction nozzle (13) and second suction nozzle (14) are located bar-shaped system (16) respectively, the second strip-shaped suction nozzle (15) and the second strip-shaped nozzle (16) are respectively positioned at the inner side and the outer side of the outer filter screen (9);
The rotary table (7) comprises an upper rotary table and a lower rotary table, and the outer filter screen (9) and the inner filter screen (8) are respectively arranged on the upper rotary table and the lower rotary table;
the second strip-shaped nozzle (16) is arranged on the inner side of the middle shell (1) or is arranged on the middle shell (1) from the outer side;
A cleaning pipeline (17) and a sewage discharge pipeline (18) are arranged outside the middle shell (1), the cleaning pipeline (17) is respectively connected with the first strip-shaped nozzle (14) and the second strip-shaped nozzle (16), and the sewage discharge pipeline (18) is respectively connected with the first strip-shaped suction nozzle (13) and the second strip-shaped suction nozzle (15);
the cleaning pipeline (17) is provided with a high-pressure backwash pump (19), and the sewage pipeline (18) is provided with a vacuum suction device (20);
the inlet of the cleaning pipeline (17) is connected with the middle shell (1) or the purified water outlet (5);
Both sides of the first strip-shaped suction nozzle (13) and the second strip-shaped suction nozzle (15) are provided with scrapers (21), and the scrapers (21) are propped against the inner side surface of the inner filter screen (8);
both sides of the first strip-shaped nozzle (14) and the second strip-shaped nozzle (16) are provided with baffles (22).
2. An automatic jet cleaning filter according to claim 1, wherein: the turntable (7) is driven by a motor (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811472277.9A CN109513251B (en) | 2018-12-04 | 2018-12-04 | Automatic jet cleaning filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811472277.9A CN109513251B (en) | 2018-12-04 | 2018-12-04 | Automatic jet cleaning filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109513251A CN109513251A (en) | 2019-03-26 |
| CN109513251B true CN109513251B (en) | 2024-04-19 |
Family
ID=65794333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811472277.9A Active CN109513251B (en) | 2018-12-04 | 2018-12-04 | Automatic jet cleaning filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109513251B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004141785A (en) * | 2002-10-25 | 2004-05-20 | Amiad Japan:Kk | Filtration device |
| CN102580387A (en) * | 2012-03-08 | 2012-07-18 | 黄庆 | Self-cleaning filter capable of realizing double-sided backwashing |
| CN103316520A (en) * | 2013-07-10 | 2013-09-25 | 上海船研环保技术有限公司 | Labyrinth type filter net synchronous high-pressure backwashing and self-cleaning filter for ballast water treatment |
| CN105498341A (en) * | 2016-01-21 | 2016-04-20 | 新疆石达赛特科技有限公司 | Filter |
| CN105536331A (en) * | 2016-03-04 | 2016-05-04 | 上海滤威过滤系统有限公司 | Filter and dual-channel cleaning device thereof |
| CN209985028U (en) * | 2018-12-04 | 2020-01-24 | 杨小霞 | Automatic jet cleaning filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140021126A1 (en) * | 2012-07-18 | 2014-01-23 | Dan Lin | Reversible backwashing self-cleaning filter |
| US20170072343A1 (en) * | 2015-09-16 | 2017-03-16 | Sunglory Inc. | Low Back Pressure Self Cleaning Filter |
-
2018
- 2018-12-04 CN CN201811472277.9A patent/CN109513251B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004141785A (en) * | 2002-10-25 | 2004-05-20 | Amiad Japan:Kk | Filtration device |
| CN102580387A (en) * | 2012-03-08 | 2012-07-18 | 黄庆 | Self-cleaning filter capable of realizing double-sided backwashing |
| CN103316520A (en) * | 2013-07-10 | 2013-09-25 | 上海船研环保技术有限公司 | Labyrinth type filter net synchronous high-pressure backwashing and self-cleaning filter for ballast water treatment |
| CN105498341A (en) * | 2016-01-21 | 2016-04-20 | 新疆石达赛特科技有限公司 | Filter |
| CN105536331A (en) * | 2016-03-04 | 2016-05-04 | 上海滤威过滤系统有限公司 | Filter and dual-channel cleaning device thereof |
| CN209985028U (en) * | 2018-12-04 | 2020-01-24 | 杨小霞 | Automatic jet cleaning filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109513251A (en) | 2019-03-26 |
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