CN218221328U - Back flush filter core and leading filter thereof - Google Patents
Back flush filter core and leading filter thereof Download PDFInfo
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- CN218221328U CN218221328U CN202222426131.9U CN202222426131U CN218221328U CN 218221328 U CN218221328 U CN 218221328U CN 202222426131 U CN202222426131 U CN 202222426131U CN 218221328 U CN218221328 U CN 218221328U
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Abstract
The utility model relates to a back flush filter core and leading filter thereof. A backwashing filter element comprises a filter cartridge, wherein the top of the filter cartridge is provided with a first sealing ring and a plurality of first water through holes, the bottom of the filter cartridge is provided with a first sealing hole, and the side of the filter cartridge is provided with a plurality of filter holes; the filter element seat is arranged at the bottom of the filter cylinder and is provided with a plurality of third water through holes and piston holes communicated with the third water through holes; the first filter screen is arranged on the filter cylinder; the lifting filter element cylinder is movably inserted into the filter cylinder, the sealing cylinder is slidably inserted into the top of the filter cylinder, the lifting filter element cylinder is also provided with a lifting water inlet hole, a filter element water outlet hole and a lifting ring, and the bottom of the lifting filter element cylinder is provided with an upper sealing column; the lifting piston is inserted into the piston hole in a sliding manner, is provided with a lower sealing column, is connected with the upper sealing column and is also movably inserted into the first sealing hole; two ends of the spring are respectively connected with the lifting filter element cylinder and the filter cylinder; the rotary cylinder is provided with a plurality of water spray holes arranged along the tangential direction and is movably inserted on the lifting filter element cylinder. The back washing filter element has the advantages of uniform washing, long service life of the filter screen and low washing frequency.
Description
Technical Field
The utility model relates to a filter core, especially a back flush filter core and leading filter thereof.
Background
The prior pre-filters typically have a 40 micron mesh diameter and tend to clog after a period of use, and to increase the life span, the clogged particles are washed off the mesh by back flushing and discharged to the outside of the filter. The reverse flow of water flow can be realized only during the back flushing of the existing filter, and the reverse flushing is realized through the reverse flow.
The existing back washing has the defects of poor washing effect and higher back washing frequency due to fixed direction and uneven water flow. Although the frequency of back flushing is increased, the service life of the filter screen cannot be effectively prolonged.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a can realize evenly washing, a back flush filter core that washing effect is good, concrete technical scheme is:
a backwash filter cartridge comprising: the filter cartridge comprises a filter cartridge, wherein a first sealing ring is arranged at the top of the filter cartridge, a plurality of first water passing holes are formed in the first sealing ring, a first sealing hole is formed in the bottom of the filter cartridge, and a plurality of filtering holes are formed in the filter cartridge; the filter element seat is arranged at the bottom of the filter cylinder, a plurality of third water passing holes and piston holes communicated with the third water passing holes are formed in the filter element seat, and the piston holes are communicated with the first sealing holes; the first filter screen is arranged on the filter cylinder and is positioned between the first sealing ring and the top of the filter cylinder seat; the lifting filter element cylinder is movably inserted into the filter cylinder, a sealing cylinder of the lifting filter element cylinder is slidably inserted into the top of the filter cylinder, a lifting water inlet hole, a filter element water outlet hole and a lifting ring are arranged at the top of the lifting filter element cylinder, the lifting ring is positioned above the first sealing ring, and an upper sealing column is arranged at the bottom of the lifting filter element cylinder; a first seal ring mounted on the first seal ring; the lifting piston is inserted into the piston hole in a sliding mode, a lower sealing column is arranged at the top of the lifting piston, the lower sealing column is connected with the upper sealing column and movably inserted into the first sealing hole, and a plurality of second water passing holes are formed in the lifting piston; the spring is movably inserted on the lifting filter element cylinder, and two ends of the spring are respectively connected with the lifting filter element cylinder and the filter cylinder and used for enabling the lower sealing column to seal the first sealing hole; the rotary cylinder is provided with a plurality of water spraying holes, the water spraying holes are arranged along the tangential direction, and the rotary cylinder is movably inserted on the lifting filter element cylinder and is positioned inside the filter cylinder; when the lifting filter element cylinder descends, the lifting ring seals the first water through hole, and the upper sealing column seals the first sealing hole.
Preferably, the bottom of the filter cylinder is provided with a plurality of buckles, the top of the filter cylinder seat is provided with a plurality of clamping grooves, and the buckles are inserted into the clamping grooves.
Preferably, the filter cartridge further comprises a second sealing ring, wherein the second sealing ring is installed at the bottom of the filter cartridge and is located between the filter cartridge seat and the filter cartridge.
Preferably, the lifting piston further comprises a third sealing ring, and the third sealing ring is mounted on the lifting piston and is slidably located in the piston hole.
Preferably, the method further comprises the following steps: the filter element cover is arranged at the top of the lifting filter element cylinder, and a plurality of cover plate through holes communicated with the filter element water outlet holes are formed in the filter element cover; and the second filter screen is arranged at the top of the lifting filter element cylinder and is positioned between the lifting ring and the filter element cover, and the second filter screen is also arranged opposite to the lifting water inlet hole.
A pre-filter, comprising: the backwashing filter element is characterized in that a filter core is arranged in the backwashing filter; the filter cartridge is arranged in the filter outer cylinder, and the first sealing ring is positioned between the first sealing ring and the filter outer cylinder; the connecting seat is provided with a first water inlet hole, a first water outlet hole and a limiting hole, the top of the limiting hole is communicated with the first water outlet hole, the connecting seat is installed at the top of the filtering outer cylinder, the top of the lifting filter element cylinder is movably inserted into the limiting hole, and the lifting ring abuts against the limiting hole; the connecting pipe is connected with the filtering outer barrel; and the drain valve is connected with the connecting pipe.
Preferably, the device further comprises a scraping device, and the scraping device comprises: the scraping and washing cylinder is provided with a plurality of scraping and washing through holes, the scraping and washing cylinder is movably inserted on the filter cylinder and is connected with the connecting pipe, and the filtering outer cylinder is rotatably arranged on the connecting pipe; and the scraping plate is arranged on the scraping and washing barrel and movably abutted against the inner circular surface of the filtering outer barrel.
Furthermore, a plurality of lifting grooves are formed in the filtering outer barrel, a plurality of first limiting blocks are arranged on the first sealing ring, the first limiting blocks are inserted into the lifting grooves and correspond to the lifting grooves one to one, a plurality of lifting blocks are arranged on the lifting ring, and the lifting blocks are slidably inserted into the lifting grooves and correspond to the lifting grooves one to one.
Compared with the prior art the utility model discloses following beneficial effect has:
the utility model provides a pair of back flush filter core rotates the back flush through the hole for water spraying, has effectively improved the efficiency and the reliability of back flush, can guarantee the even abundant washing of filter screen, reduces to block up, prolongs the life of filter screen to and reduced the frequency of back flush.
Drawings
FIG. 1 is a cross-sectional view of a backwash filter cartridge;
FIG. 2 is a front view of a backwash filter cartridge;
FIG. 3 is a schematic diagram of a backwash filter element;
FIG. 4 is a schematic structural view of a filter cartridge;
FIG. 5 is a cross-sectional view of the filter cartridge;
FIG. 6 is a schematic view of the construction of the elevating cartridge;
FIG. 7 is a schematic view of a cartridge holder;
FIG. 8 is a schematic view of the construction of the elevating piston;
FIG. 9 is a schematic view of the structure of the rotary cylinder;
FIG. 10 is a schematic view of a pre-filter construction;
FIG. 11 is a schematic structural view of a filter cartridge;
fig. 12 is a schematic view of the construction of the scrub cylinder.
Detailed Description
The present invention will now be further described with reference to the accompanying drawings.
Example one
As shown in fig. 1 to 9, a backwash filter element includes a filter cartridge 1, a filter element seat 4, a first filter screen, a lift filter element cylinder 2, a first seal ring 31, a lift piston 5, a spring, and a rotary cylinder 50.
The cartridge filter 1 is provided with a plurality of filter holes 13, and the first filter screen is installed on the cartridge filter 1 and is arranged opposite to the filter holes 13. The top of cartridge filter 1 is equipped with first sealing ring 11, and the diameter of first sealing ring 11 is greater than the external diameter of cartridge filter 1, and annular array is equipped with eight first water holes 12 on the first sealing ring 11, and first sealing washer 31 is equipped with to the outer disc of first sealing ring 11. The bottom of the filter cartridge 1 is provided with a first sealing hole 16 and four buckles 15, and the buckles 15 are arranged in an annular array. The outer circular surface of the bottom of the filter cartridge 1 is also provided with a second sealing ring 32.
The outer circular surface of the filter element seat 4 is provided with a fourth sealing ring 34, and the fourth sealing ring 34 is positioned at the bottom of the filter element seat 4. The top of filter element seat 4 is equipped with first connecting groove 42, and the bottom annular array of first connecting groove 42 is equipped with four draw-in grooves 43, and buckle 15 is inserted on draw-in groove 43, and the bottom of cartridge filter 1 is inserted in first connecting groove 42 to second sealing washer 32 realizes the sealed between first connecting groove 42 and the cartridge filter 1. The filter element seat 4 is provided with a third water through hole 44 and a piston hole 41, the piston hole 41 is positioned at the bottom of the filter element seat 4 and is communicated with the first connecting groove 42, and the piston hole 41 is also communicated with the first sealing hole 16; the third water through holes 44 are annularly arrayed on the outer circumferential surface of the cartridge holder 4 and communicate with the top of the piston hole 41.
The first screen is located between the first sealing ring 11 and the cartridge seat 4.
The lifting filter element cylinder 2 comprises a lifting cylinder 21, a lifting ring 22, a sealing cylinder 23, a connecting cylinder 24 and an upper sealing column 25 which are arranged in sequence from top to bottom; the top of the lifting cylinder 21 is provided with a filter element water outlet 27, the side surface is provided with a lifting water inlet 26, and the filter element water outlet 27 is communicated with the lifting water inlet 26. The sealing cylinder 23, the connecting cylinder 24 and the upper sealing column 25 are movably inserted in the filter cartridge 1, and the sealing cylinder 23 is located at the top of the filter cartridge 1 and is in sliding seal with the filter cartridge 1 through a sealing ring or a sealing ring. The upper sealing post 25 is also movably inserted in the first sealing hole 16. The lifting ring 22 is disposed opposite to the first sealing ring 11 for sealing the first water through hole 12. The connecting cylinder 24 is provided with a spring ring 28 and a plurality of connecting through holes 20.
The outer circle surface of the lifting piston 5 is provided with a third sealing ring 33, the center of the lifting piston 5 is provided with a lower sealing column 51, and the lower sealing column 51 is connected with the upper sealing column 25 and movably inserted in the first sealing hole 16. Three second water through holes 52 are formed in the elevating piston 5 in an annular array, and the second water through holes 52 are communicated with the third water through holes 44. The lifting piston 5 is slidably inserted into the piston hole 41, and the third seal ring 33 seals between the lifting piston 5 and the piston hole 41.
The spring is movably inserted in the connecting cylinder 24, and both ends of the spring respectively abut against the spring ring 28 and the bottom of the filter cartridge 1, so that the lower sealing post 51 seals the first sealing hole 16.
The rotary cylinder 50 is movably inserted on the lifting filter element cylinder 2 and is positioned inside the filter cylinder 1; a plurality of water spray holes 501 are formed in the rotary drum 50, the water spray holes 501 are arranged in the tangential direction, wherein two groups of water spray holes 501 are formed, three water spray holes 501 are formed in each group along the axis of the rotary drum 50, and two groups of water spray holes 501 are arranged in an annular array. The hole for water spraying 501 sets up along tangential direction, can make the rivers that flow through spout along tangential direction, and then promote rotatory section of thick bamboo 50 rotatory to make spun rivers wash the interior disc of whole first filter screen, increased the pressure that washes, and realized diversified evenly washing, guaranteed reliable washing effect, avoid the rivers that local jam caused inhomogeneous, block up the condition that can't clear away. When the lifting filter element cylinder 2 descends, the lifting ring 22 seals the first water through hole 12, and the upper sealing column 25 seals the first sealing hole 16.
In order to prevent unfiltered water from entering the inside of the filter element, the second filter screen is arranged on the lifting cylinder 21, the second filter screen is fixed on the lifting cylinder 21 by the filter element cover 38, a plurality of cover plate through holes 381 communicated with the filter element water outlet hole 27 are arranged on the filter element cover 38, and the second filter screen is also arranged opposite to the lifting water inlet hole 26.
During back flushing, the lifting ring 22 pushes the lifting filter element cylinder 2 to descend under the pressure of water, the lifting ring 22 is pressed on the first sealing ring 11, the lifting ring 22 seals the first water passing hole 12, water enters the interior from the second filter screen and the lifting water inlet hole 26 on the side surface of the lifting cylinder 21, then the water sequentially passes through the sealing cylinder 23 and the connecting cylinder 24 and the connecting through hole 20 to enter the interior of the filter cylinder 1, at the moment, the lower sealing column 51 seals the first sealing hole 16, water can only pass through the first filter screen to carry out back flushing, and water is back flushed after passing through the water spraying holes 501 on the rotary cylinder 50, because the water spraying holes 501 are arranged along the tangent line, water flow pushes the water spraying holes 501 to rotate, so that the water spraying holes 501 flush the first filter screen, and the water is washed in a rotating manner, and uniform flushing is realized.
Example two
As shown in fig. 10 to 12, a pre-filter includes a backwash filter element, a filter outer cylinder 7, a connecting base 8, a connecting pipe 91, a drain valve 92, and a scraping device. The filter cartridge 1 is installed in the filter outer cylinder 7, and the first sealing ring 31 is located between the first sealing ring 11 and the filter outer cylinder 7.
Two sides of the connecting base 8 are respectively provided with a first water inlet hole 81 and a first water outlet hole 82, the inside of the connecting base 8 is provided with a limiting hole 83, the top of the limiting hole 83 is communicated with the first water outlet hole 82, the connecting base 8 is arranged at the top of the filtering outer barrel 7, the lifting barrel 21 is movably inserted in the limiting hole 83, the bottom of the lifting barrel 21 is provided with the fifth sealing ring 35, the fifth sealing ring 35 is movably inserted in the limiting hole 83, and the lifting ring 22 abuts against the limiting hole 83.
The scraping and washing device comprises a scraping and washing cylinder 6 and a scraper, a plurality of scraping and washing through holes 61 are formed in the scraping and washing cylinder 6, the filter cylinder 1 is movably inserted into the scraping and washing cylinder 6, and the fourth sealing ring 34 is located between the scraping and washing cylinder 6 and the filter element seat 4 to realize sealing. The bottom of the scraping and washing cylinder 6 is conical and is connected with a connecting pipe 91, and a drain valve 92 is arranged on the connecting pipe 91. The bottom of the filtering outer cylinder 7 is rotatably arranged on the connecting pipe 91, and a plurality of sealing rings are arranged between the filtering outer cylinder and the connecting pipe 91. The scraper is arranged on the scraping groove 62 of the scraping cylinder 6 and is arranged along the axis, and the scraper is also movably abutted against the inner circular surface of the filtering outer cylinder 7.
Wherein, the inside of filtering the urceolus 7 is equipped with a plurality of lift grooves 71, is equipped with a plurality of first stopper 14 on the first sealing ring 11, and first stopper 14 inserts in lift groove 71, and with lift groove 71 one-to-one, is equipped with a plurality of lifters 29 on the lift ring 22, and lifters 29 slide and insert in lift groove 71, and with lift groove 71 one-to-one. The lifting groove 71, the first limiting block 14 and the lifting block 29 are used for placing the filter cartridge 1 and the lifting filter cartridge 2 to rotate.
During the filtration, lift filter element section of thick bamboo 2 keeps the jack-up state under the effect of spring, the bottom at spacing hole 83 is supported to the go-and-go ring 22 this moment, fifth sealing washer 35 is located between go-and-go ring 21 and the spacing hole 83, it is sealed to realize, first water hole 12 of crossing is kept away from to the go-and-go ring 22, water enters into through first water hole 12 and filters between urceolus 7 and the first filter screen, sealed post 51 is inserted in first sealed hole 16 down this moment, realize the sealing of 2 bottoms of lift filter element section of thick bamboos, filterable particulate matter or foul get into in the piston hole 41 through the third water hole 44 on the filter element seat 4, second water hole 52 on the rethread lift piston 5 enters into in the connecting pipe 91. The water after filtration upwards gets into a section of thick bamboo 21 through connect the through-hole 20 to get into first apopore 82 through apron through-hole 381, accomplish and filter.
During back flushing, the blowdown valve 92 is opened, the lifting ring 22 pushes the lifting filter element cylinder 2 to descend under the pressure of water, the lifting ring 22 is pressed on the first sealing ring 11, the lifting ring 22 seals the first water through hole 12, the water enters the interior from the second filter screen and the lifting water inlet hole 26 on the side surface of the lifting cylinder 21 and then sequentially passes through the sealing cylinder 23, the connecting cylinder 24 and the connecting through holes 20 to enter the interior of the filter cylinder 1, at the moment, the lower sealing column 51 seals the first sealing hole 16, the water can only pass through the first filter screen to carry out back flushing, the water passes through the water spray holes 501 in the rotating cylinder 50 to carry out back flushing, and as the water spray holes 501 are arranged along a tangent line, the water flow pushes the water spray holes 501 to rotate, so that the water spray of the water spray holes 501 washes the first filter screen, and the water is rotated to flush, and uniform flushing is realized. The water and the particles passing through the first filter mesh enter the piston hole 41 through the third water passing hole 44 on the filter core holder 4, enter the connection pipe 91 through the second water passing hole 52 on the lifting piston 5, and are discharged through the blow-down valve 92.
The technical principle of the present invention has been described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the claims of the present invention.
Claims (8)
1. A backwash filter cartridge, comprising:
the filter cartridge comprises a filter cartridge (1), wherein a first sealing ring (11) is arranged at the top of the filter cartridge (1), a plurality of first water passing holes (12) are formed in the first sealing ring (11), a first sealing hole (16) is formed in the bottom of the filter cartridge (1), and a plurality of filter holes (13) are formed in the filter cartridge (1);
the filter element seat (4) is installed at the bottom of the filter cartridge (1), a plurality of third water passing holes (44) and piston holes (41) communicated with the third water passing holes (44) are formed in the filter element seat (4), and the piston holes (41) are communicated with the first sealing hole (16);
the first filter screen is arranged on the filter cartridge (1) and is positioned between the first sealing ring (11) and the top of the filter cartridge seat (4);
the filter element lifting device comprises a lifting filter element cylinder (2), wherein the lifting filter element cylinder (2) is movably inserted into the filter cylinder (1), a sealing cylinder (23) of the lifting filter element cylinder (2) is slidably inserted into the top of the filter cylinder (1), a lifting water inlet hole (26), a filter element water outlet hole (27) and a lifting ring (22) are formed in the top of the lifting filter element cylinder (2), the lifting ring (22) is located above the first sealing ring (11), and an upper sealing column (25) is arranged at the bottom of the lifting filter element cylinder (2);
a first seal ring (31), said first seal ring (31) being mounted on said first seal ring (11);
the lifting piston (5) is inserted into the piston hole (41) in a sliding mode, a lower sealing column (51) is arranged at the top of the lifting piston (5), the lower sealing column (51) is connected with the upper sealing column (25) and movably inserted into the first sealing hole (16), and a plurality of second water through holes (52) are formed in the lifting piston (5);
the spring is movably inserted on the lifting filter element cylinder (2), and two ends of the spring are respectively connected with the lifting filter element cylinder (2) and the filter cylinder (1) and used for enabling the lower sealing column (51) to seal the first sealing hole (16); and
the rotary drum (50), a plurality of water spray holes (501) are arranged on the rotary drum (50), the water spray holes (501) are arranged along the tangential direction, and the rotary drum (50) is movably inserted on the lifting filter element drum (2) and is positioned inside the filter cartridge (1);
when the lifting filter element cylinder (2) descends, the lifting ring (22) seals the first water through hole (12), and the upper sealing column (25) seals the first sealing hole (16).
2. A backwash filter element as in claim 1, wherein the bottom of the filter cartridge (1) is provided with a plurality of snap-in grooves (15), the top of the filter cartridge holder (4) is provided with a plurality of snap-in grooves (43), and the snap-in grooves (15) are inserted on the snap-in grooves (43).
3. A backflush filter cartridge according to claim 1, further comprising a second sealing ring (32), said second sealing ring (32) being mounted at the bottom of the filter cartridge (1) and being located between the cartridge seat (4) and the filter cartridge (1).
4. A backwash filter element as claimed in claim 1, further comprising a third sealing ring (33), said third sealing ring (33) being mounted on said lifting piston (5) and slidably located in said piston bore (41).
5. The backwash filter cartridge as defined in claim 1, further comprising:
the filter element cover (38), the filter element cover (38) is installed on the top of the lifting filter element cylinder (2), and a plurality of cover plate through holes (381) communicated with the filter element water outlet hole (27) are formed in the filter element cover (38); and
the second filter screen is installed at the top of the lifting filter element cylinder (2) and located between the lifting ring (22) and the filter element cover (38), and the second filter screen is also arranged opposite to the lifting water inlet hole (26).
6. A pre-filter, comprising:
a backflush filter element according to any one of claims 1 to 5;
the filter cartridge (1) is mounted in the filter outer cylinder (7), and the first sealing ring (31) is positioned between the first sealing ring (11) and the filter outer cylinder (7);
the filter element lifting device comprises a connecting seat (8), wherein a first water inlet hole (81), a first water outlet hole (82) and a limiting hole (83) are formed in the connecting seat (8), the top of the limiting hole (83) is communicated with the first water outlet hole (82), the connecting seat (8) is installed at the top of the filter outer cylinder (7), the top of the lifting filter element cylinder (2) is movably inserted into the limiting hole (83), and the lifting ring (22) abuts against the limiting hole (83);
a connecting pipe (91), wherein the connecting pipe (91) is connected with the filtering outer cylinder (7); and
a blowoff valve (92), the blowoff valve (92) being connected with the connection pipe (91).
7. A pre-filter according to claim 6, further comprising a scraping device comprising:
the scraping and washing device comprises a scraping and washing cylinder (6), wherein a plurality of scraping and washing through holes (61) are formed in the scraping and washing cylinder (6), the scraping and washing cylinder (6) is movably inserted into the filter cylinder (1) and is connected with the connecting pipe (91), and the filtering outer cylinder (7) is rotatably installed on the connecting pipe (91); and
the scraper is arranged on the scraping and washing barrel (6) and movably abutted against the inner circular surface of the filtering outer barrel (7).
8. The prefilter of claim 6 wherein said filtering outer cylinder (7) is provided with a plurality of lifting grooves (71) therein, said first sealing ring (11) is provided with a plurality of first stoppers (14), said first stoppers (14) are inserted into said lifting grooves (71) and correspond to said lifting grooves (71) one by one, said lifting ring (22) is provided with a plurality of lifting blocks (29), and said lifting blocks (29) are slidably inserted into said lifting grooves (71) and correspond to said lifting grooves (71) one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222426131.9U CN218221328U (en) | 2022-09-13 | 2022-09-13 | Back flush filter core and leading filter thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222426131.9U CN218221328U (en) | 2022-09-13 | 2022-09-13 | Back flush filter core and leading filter thereof |
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| Publication Number | Publication Date |
|---|---|
| CN218221328U true CN218221328U (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222426131.9U Active CN218221328U (en) | 2022-09-13 | 2022-09-13 | Back flush filter core and leading filter thereof |
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| CN (1) | CN218221328U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116119889A (en) * | 2023-04-18 | 2023-05-16 | 长沙特盾环保科技有限公司 | Pure water treatment device |
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2022
- 2022-09-13 CN CN202222426131.9U patent/CN218221328U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116119889A (en) * | 2023-04-18 | 2023-05-16 | 长沙特盾环保科技有限公司 | Pure water treatment device |
| CN116119889B (en) * | 2023-04-18 | 2023-06-13 | 长沙特盾环保科技有限公司 | Pure water treatment device |
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