CN209423036U - A kind of automatic backwash sandrock filter - Google Patents
A kind of automatic backwash sandrock filter Download PDFInfo
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- CN209423036U CN209423036U CN201822192519.0U CN201822192519U CN209423036U CN 209423036 U CN209423036 U CN 209423036U CN 201822192519 U CN201822192519 U CN 201822192519U CN 209423036 U CN209423036 U CN 209423036U
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Abstract
The utility model relates to irrigate filter plant field, a kind of automatic backwash sandrock filter is disclosed, tank body top is equipped with water inlet, water inlet is arranged right below vertical tube, and vertical tube lower end is cased with bearing, and bearing is nested in rotation pipe upper end, rotation pipe lower end is equipped with bottom plate, and bottom plate is equipped with multiple drainage holes；Rotation pipe bottom side of the wall is equidistant, and around multiple branch pipes are equipped with, branch pipe one end is equipped with external screw thread, and branch pipe is fixedly connected by being set to the tapped through hole of rotation pipe bottom side of the wall with rotation pipe, is equipped with multiple drainage holes below branch pipe.The problem of the utility model solves existing automatic backwash sandrock filter raw water, and to enter filter interior water flow excessive, and big stock water flow is washed away for a long time causes casting bed to form access, and casting bed is caused to reduce the filter effect of raw water.Also solve during the filtration process that rest part casting bed is not engaged in raw water filtration, the low problem of casting bed utilization rate in addition to yarn bed immediately below the water inlet simultaneously.
Description
Technical field
The utility model relates to irrigate filter plant field, in particular to a kind of automatic backwash sandrock filter.
Background technique
Water-saving irrigation is the irrigation theory of today's society, is to realize water-saving filling using micro-irrigation equipments such as mini sprinkler or drip irrigation zones
The main means irrigate.It causes to irrigate in order to avoid the substances such as organic matter present in irrigation water, inorganic matter block water irrigator and is
The paralysis of system needs to pre-process water source, and the dirt removals such as solid sand grains in water are fallen.Sandrock filter is micro- at present
Most wide one of the filter plant of engineering use scope is filled, sandrock filter is also known as quartz filter, sand filter, it is by equal
The partial sizes quartz sand such as matter forms the filter that casting bed carries out three-dimensional in-depth filtration as filtration supports.The filtering of sandrock filter is situated between
Matter is quartz sand filter media, and raw water is intercepted by the impurity of quartz sand filter media Shi Shuizhong, so that water outlet be made to achieve the purpose that filtering.
Existing automatic backwash sandrock filter, after operation, when impurities in water and various suspended matters reach a certain amount of
When, which can pass through the inlet and outlet pressure between the pressure gauge of pressure difference control device real-time detection inlet and outlet
Difference, when pressure difference reaches setting value, automatically controlled PLC can send signal, three water flowings to the threeway hydraulic control valve in control system
Force control valve can be automatically controlled by water route thirdly water flowing force control valve, allows its closing water inlet passageway to open simultaneously blowdown logical
Road, at this moment since drain outlet pressure is smaller, flushing water stream is entered by the water outlet of the tank body, from bottom to up and continuous erosion
The casting bed of the tank body, to achieve the effect that cleaning, the sewage after flushing enters this by water inlet in the presence of hydraulic pressure and crosses tank
The sewage draining exit of body finally enters blow-off line, completes a blowdown process.
But its raw water of existing sandrock filter is mostly that filter inner cavity is directly entered from water inlet, and raw water water flow can be held
The continuous casting bed for washing away water inlet face position, washes away will lead to casting bed formation access for a long time, and water flow is flowed down along access, caused
Casting bed reduces the filter effect of raw water, in addition, rest part yarn bed does not have in addition to yarn bed immediately below water inlet during the filtration process
There is participation raw water filtration, casting bed utilization rate is low.
Utility model content
Based on the above technical problem, the utility model provides a kind of automatic backwash sandrock filter, solves existing
Automatic backwash sandrock filter raw water enters that filter interior water flow is excessive, and big stock water flow is washed away for a long time leads to casting bed shape
At access, the problem of causing casting bed to reduce the filter effect of raw water.It also solves simultaneously and is removing water inlet just during the filtration process
Yarn bed outer rest part casting bed in lower section is not engaged in raw water filtration, the low problem of casting bed utilization rate.
In order to solve the above technical problems, the technical solution adopted in the utility model is as follows:
A kind of automatic backwash sandrock filter, including tank body, sand loading mouth, water inlet pipe, outlet pipe, sewage pipe, three water flowings
Force control valve, water inlet pressure gauge and water outlet pressure gauge, tank body top are equipped with water inlet, and water inlet is arranged right below vertical tube,
Vertical tube lower end is cased with bearing, and bearing is nested in rotation pipe upper end, and rotation pipe lower end is equipped with bottom plate, and bottom plate is equipped with multiple drainings
Hole；Rotation pipe bottom side of the wall is equidistant around multiple branch pipes are equipped with, and branch pipe one end is equipped with external screw thread, and branch pipe is by being set to rotation pipe
The tapped through hole of bottom side of the wall is fixedly connected with rotation pipe, and multiple drainage holes are equipped with below branch pipe.
In the present invention, when to raw water filtration, raw water enters tank body through water inlet by water inlet pipe, then through vertical tube
Flow into rotation pipe.Rotation pipe shunts big stock raw water by branch pipe, is divided big stock raw water by drainage hole below bottom plate and branch pipe
Yarn bed is flowed into from for shallow bid water flow, avoids yarn bed from forming access by big stock current scour, causes casting bed to the filter effect of raw water
The problem of reduction.Raw water can be transmitted to casting bed everywhere by branch pipe simultaneously, be uniformly distributed raw water and flowed down, make full use of yarn bed.This
Outside, raw water is that unfiltered water contains impurity, and after a period of use, branch pipe drainage hole may be blocked by impurity.At this point, by
It can be rotated in rotation pipe, hand can be protruded into hold branch pipe and rotate it to below sand loading mouth by sand loading mouth and screwed off by operator
It takes out, branch pipe can be cleaned, be replaced.
As a preferred mode, drainage hole equidistantly distributed below branch pipe, draining pore size distribution setting branch pipe just under
In side and lower section orphan face.
As a preferred mode, water outlet is equipped with below tank body, water outlet is connected to outlet pipe；Water inlet upper end with
The connection of threeway hydraulic control valve, water inlet pipe, sewage pipe are connected to threeway hydraulic control valve；Tank inner chamber lower part be equipped with it is with holes every
Plate, partition top, which is equipped with below casting bed, is equipped with water-purifying cavity；Partition upper surface is equipped with multiple filter caps, and filter cap lower end passes through separator perforation
It is connected to water-purifying cavity.
As a preferred mode, water outlet and outlet pipe pass through flanged joint, water inlet and threeway hydraulic control valve
Pass through flanged joint.
As a preferred mode, filter cap is taper, and filter cap side is equipped with a plurality of opening.
As a preferred mode, casting bed is accumulated by quartzy sand grains.
As a preferred mode, tank body can be connect with a number of tank body, water inlet pipe, outlet pipe between tank body and
Sewage pipe is interconnected.
As a preferred mode, sand loading mouth is equipped with cover board.
Compared with prior art, the utility model has the beneficial effects that
(1) the utility model, which solves existing automatic backwash sandrock filter raw water and enters filter interior water, flows through
Greatly, the problem of big stock water flow is washed away for a long time causes casting bed to form access, and casting bed is caused to reduce the filter effect of raw water.Together
When also solve during the filtration process that rest part casting bed is not engaged in raw water filtration, casting bed benefit in addition to yarn bed immediately below the water inlet
With the low problem of rate.
(2) the utility model is arranged immediately below branch pipe by drainage hole equidistantly distributed below branch pipe, draining pore size distribution
On the orphan face of lower section, the drainage hole being laid in branch pipe cambered surface, raw water water flow can be tilted from drainage hole to flow out, and increases raw water distribution
Range is distributed raw water on casting bed more uniform.
(3) the utility model is connected to by being equipped with water outlet, water outlet below tank body with outlet pipe；Water inlet upper end and three
The connection of water flowing force control valve, water inlet pipe, sewage pipe are connected to threeway hydraulic control valve；Tank inner chamber lower part be equipped with it is with holes every
Plate,；It is equipped with below casting bed above partition and is equipped with water-purifying cavity；Partition upper surface is equipped with multiple filter caps, and filter cap lower end passes through partition board hole
Hole is connected to water-purifying cavity, and it is spare that water-purifying cavity can store a certain amount of water purification.
(4) for the utility model by water outlet and outlet pipe by flanged joint, water inlet and threeway hydraulic control valve are logical
Flanged joint is crossed, flanged joint is secured, leakproofness is strong, convenient for disassembly and assembly.
(5) the utility model is taper by filter cap, and filter cap side is equipped with a plurality of opening, and filter cap can be anti-in sandrock filter
When flushing, the sludge sundries of casting bed bottom is effectively washed out, the cleaning effect of backwash is enhanced.
(6) the utility model is accumulated by casting bed by quartzy sand grains, and the partial size of quartz sand particle is relatively uniform, filtering
When preferably surface can be overcome to block, the retaining power of entire casting bed can be given full play to, can be provided high-quality under higher filtering velocity
Cross drainage.
(7) the utility model can be connect by tank body with a number of tank body, water inlet pipe, outlet pipe and row between tank body
Dirt pipe is interconnected.Multiple tank body cooperations can carry out sewage backwash to each tank body under the premise of uninterrupted supply water.
(8) the utility model is equipped with cover board by sand loading mouth, and impurity is avoided to float in tank body.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model.
Fig. 2 is part a enlarged diagram in Fig. 1.
Fig. 3 is branch pipe and rotation pipe bottom view.
Fig. 4 is multiple tank body mating connection schematic diagrames.
Wherein, 1 water inlet pipe, 2 sewage pipes, 3 tank bodies, 4 casting beds, 5 filter caps, 6 partitions, 7 water-purifying cavities, 8 flanges, 9 outlet pipes, 10
Water outlet pressure gauge, 11 branch pipes, 12 sand loading mouths, 13 cover boards, 14 threeway hydraulic control valves, 15 water inlet pressure gauges, 16 vertical tubes, 17
Bearing, 18 rotation pipes, 19 bottom plates, 20 drainage holes.
Specific embodiment
The utility model will be further described below with reference to the accompanying drawings.The embodiments of the present invention includes but unlimited
In the following example.
Embodiment 1:
Referring to Fig. 1~4, a kind of automatic backwash sandrock filter, including tank body 3, sand loading mouth 12, water inlet pipe 1, outlet pipe
9, sewage pipe 2, threeway hydraulic control valve 14, water inlet pressure gauge 15 and water outlet pressure gauge 10,3 top of tank body are equipped with water inlet
Mouthful, water inlet is arranged right below vertical tube 16, and 16 lower end of vertical tube is cased with bearing 17, and bearing 17 is nested in 18 upper end of rotation pipe, rotation
18 lower end of pipe is equipped with bottom plate 19, and bottom plate 19 is equipped with multiple drainage holes 20；18 bottom side of the wall of rotation pipe is equidistant more around being equipped with
A branch pipe 11,11 one end of branch pipe be equipped with external screw thread, branch pipe 11 by be set to 18 bottom side of the wall of rotation pipe tapped through hole and rotation
Pipe 18 is fixedly connected, and multiple drainage holes 20 are equipped with below branch pipe 11.
In the present embodiment, when to raw water filtration, raw water enters tank body 3 through water inlet by water inlet pipe 1, then through vertical tube
16 flow into rotation pipe 18.Rotation pipe 18 shunts big stock raw water by branch pipe 11, passes through 11 lower section drainage hole of bottom plate 19 and branch pipe
Big stock raw water is separated into shallow bid water flow by 20 flows into yarn bed, avoids yarn bed from forming access by big stock current scour, causes casting bed 4 right
The filter effect of raw water reduces.Raw water can be transmitted to casting bed 4 everywhere by branch pipe 11 simultaneously, be uniformly distributed raw water and flowed down, sufficiently
Utilize yarn bed.In addition, raw water is that unfiltered water contains impurity, after a period of use, the drainage hole 20 of branch pipe 11 may
It is blocked by impurity.At this point, hand can be protruded by sand loading mouth 12 and hold branch pipe 11 by operator since rotation pipe 18 can rotate
It rotates it to below sand loading mouth 12 and screws off taking-up, branch pipe 11 can be cleaned, be replaced.
Embodiment 2:
Referring to Fig. 1~4, a kind of automatic backwash sandrock filter, including tank body 3, sand loading mouth 12, water inlet pipe 1, outlet pipe
9, sewage pipe 2, threeway hydraulic control valve 14, water inlet pressure gauge 15 and water outlet pressure gauge 10,3 top of tank body are equipped with water inlet
Mouthful, water inlet is arranged right below vertical tube 16, and 16 lower end of vertical tube is cased with bearing 17, and bearing 17 is nested in 18 upper end of rotation pipe, rotation
18 lower end of pipe is equipped with bottom plate 19, and bottom plate 19 is equipped with multiple drainage holes 20；18 bottom side of the wall of rotation pipe is equidistant more around being equipped with
A branch pipe 11,11 one end of branch pipe be equipped with external screw thread, branch pipe 11 by be set to 18 bottom side of the wall of rotation pipe tapped through hole and rotation
Pipe 18 is fixedly connected, and multiple drainage holes 20 are equipped with below branch pipe 11.
11 lower section drainage hole of branch pipe, 20 equidistantly distributed, the distribution of drainage hole 20 setting is in 11 underface of branch pipe and lower section cambered surface
On.In the present embodiment, by 11 lower section drainage hole of branch pipe, 20 equidistantly distributed, the distribution of drainage hole 20 setting branch pipe 11 just under
In side and lower section cambered surface, the drainage hole 20 being laid in 11 cambered surface of branch pipe, raw water water flow can be tilted from drainage hole 20 to flow out, and increases
Raw water distribution is distributed raw water on casting bed 4 more uniform.
The other parts of the present embodiment are same as Example 1, just repeat no more here.
Embodiment 3:
Referring to Fig. 1~4, a kind of automatic backwash sandrock filter, including tank body 3, sand loading mouth 12, water inlet pipe 1, outlet pipe
9, sewage pipe 2, threeway hydraulic control valve 14, water inlet pressure gauge 15 and water outlet pressure gauge 10,3 top of tank body are equipped with water inlet
Mouthful, water inlet is arranged right below vertical tube 16, and 16 lower end of vertical tube is cased with bearing 17, and bearing 17 is nested in 18 upper end of rotation pipe, rotation
18 lower end of pipe is equipped with bottom plate 19, and bottom plate 19 is equipped with multiple drainage holes 20；18 bottom side of the wall of rotation pipe is equidistant more around being equipped with
A branch pipe 11,11 one end of branch pipe be equipped with external screw thread, branch pipe 11 by be set to 18 bottom side of the wall of rotation pipe tapped through hole and rotation
Pipe 18 is fixedly connected, and multiple drainage holes 20 are equipped with below branch pipe 11.
Water outlet is equipped with below tank body 3, water outlet is connected to outlet pipe 9；Water inlet upper end and threeway hydraulic control valve 14
Connection, water inlet pipe 1, sewage pipe 2 are connected to threeway hydraulic control valve 14；3 inner cavity lower part of tank body is equipped with apertured partition 6, partition 6
Top, which is equipped with below casting bed 4, is equipped with water-purifying cavity 7；6 upper surface of partition is equipped with multiple filter caps 5, and 5 lower end of filter cap passes through 6 hole of partition
It is connected to water-purifying cavity 7.In the present embodiment, it is spare can to store a certain amount of water purification for water-purifying cavity 7.
As a preferred mode, water outlet is connect with outlet pipe 9 by flange 8, and water inlet and threeway waterpower control
Valve 14 is connected by flange 8.It is connect with outlet pipe 9 by flange 8 by water outlet, water inlet and threeway hydraulic control valve 14 are logical
The connection of flange 8 is crossed, flange 8 is connected firmly, leakproofness is strong, convenient for disassembly and assembly.
As a preferred mode, filter cap 5 is taper, and 5 side of filter cap is equipped with a plurality of opening.It is taper by filter cap 5,
5 side of filter cap is equipped with a plurality of opening, and filter cap 5 can be when sandrock filter backwashes, and the sludge for effectively washing out 4 bottom of casting bed is miscellaneous
Object enhances the cleaning effect of backwash.
As a preferred mode, casting bed 4 is accumulated by quartzy sand grains.It is accumulated by casting bed 4 by quartzy sand grains
At the partial size of quartz sand particle is relatively uniform, and when filtering preferably can overcome surface to block, and can give full play to entire casting bed 4
Retaining power can provide good drainage excessively under higher filtering velocity.
The other parts of the present embodiment are same as Example 1, just repeat no more here.
Embodiment 4:
Referring to Fig. 1~4, a kind of automatic backwash sandrock filter, including tank body 3, sand loading mouth 12, water inlet pipe 1, outlet pipe
9, sewage pipe 2, threeway hydraulic control valve 14, water inlet pressure gauge 15 and water outlet pressure gauge 10,3 top of tank body are equipped with water inlet
Mouthful, water inlet is arranged right below vertical tube 16, and 16 lower end of vertical tube is cased with bearing 17, and bearing 17 is nested in 18 upper end of rotation pipe, rotation
18 lower end of pipe is equipped with bottom plate 19, and bottom plate 19 is equipped with multiple drainage holes 20；18 bottom side of the wall of rotation pipe is equidistant more around being equipped with
A branch pipe 11,11 one end of branch pipe be equipped with external screw thread, branch pipe 11 by be set to 18 bottom side of the wall of rotation pipe tapped through hole and rotation
Pipe 18 is fixedly connected, and multiple drainage holes 20 are equipped with below branch pipe 11.
Tank body 3 can be connect with a number of tank body 3, and the water inlet pipe 1, outlet pipe 9 between tank body 3 are mutually interconnected with sewage pipe 2
It is logical.In the present embodiment, when the water inlet pressure gauge of one of tank body 3 and water outlet pressure gauge difference are to setting value, control
The water inlet that threeway hydraulic control valve 14 processed closes this tank body 3 opens sewage draining exit.Other filtered water purification meetings of tank body 3 at this time
Enter from outlet pipe 9 from this 3 water outlet of tank body, is backwashed from bottom to up by impurity on casting bed 4 from top water inlet again through blowdown
Pipe 2 is taken out of, and when multiple tank bodies 3 are coupled, backwash can directly utilize other filtered water purifications of tank body 3, it is not necessary to which shutting down will
Outlet pipe 9 accesses water purification and is rinsed.It can be connect with a number of tank body 3 by tank body 3, water inlet pipe 1 between tank body 3 goes out
Water pipe 9 and sewage pipe 2 are interconnected.Multiple cooperations of tank body 3 can carry out each tank body 3 under the premise of uninterrupted supply water
Sewage backwash.
The other parts of the present embodiment are same as Example 1, just repeat no more here.
Embodiment 5:
Referring to Fig. 1~4, a kind of automatic backwash sandrock filter, including tank body 3, sand loading mouth 12, water inlet pipe 1, outlet pipe
9, sewage pipe 2, threeway hydraulic control valve 14, water inlet pressure gauge 15 and water outlet pressure gauge 10,3 top of tank body are equipped with water inlet
Mouthful, water inlet is arranged right below vertical tube 16, and 16 lower end of vertical tube is cased with bearing 17, and bearing 17 is nested in 18 upper end of rotation pipe, rotation
18 lower end of pipe is equipped with bottom plate 19, and bottom plate 19 is equipped with multiple drainage holes 20；18 bottom side of the wall of rotation pipe is equidistant more around being equipped with
A branch pipe 11,11 one end of branch pipe be equipped with external screw thread, branch pipe 11 by be set to 18 bottom side of the wall of rotation pipe tapped through hole and rotation
Pipe 18 is fixedly connected, and multiple drainage holes 20 are equipped with below branch pipe 11.
Sand loading mouth 12 is equipped with cover board 13, in the present embodiment, is equipped with cover board 13 by sand loading mouth 12, impurity is avoided to float
Enter in tank body 3.
The other parts of the present embodiment are same as Example 1, just repeat no more here.
It as above is the embodiments of the present invention.Design parameter in above-described embodiment and embodiment is merely to clear
The verification process of utility model is stated by Chu, not to limit the scope of patent protection of the utility model, the utility model it is special
Sharp protection scope is still subject to the claims, made by all specifications and accompanying drawing content with the utility model etc.
Same structure change, similarly should be included in the protection scope of the utility model.
Claims (8)
1. a kind of automatic backwash sandrock filter, including tank body (3), sand loading mouth (12), water inlet pipe (1), outlet pipe (9), row
Dirt pipe (2), threeway hydraulic control valve (14), water inlet pressure gauge (15) and water outlet pressure gauge (10), it is characterised in that: described
Tank body (3) top is equipped with water inlet, and the water inlet is arranged right below vertical tube (16), and vertical tube (16) lower end is cased with bearing
(17), the bearing (17) is nested in rotation pipe (18) upper end, and rotation pipe (18) lower end is equipped with bottom plate (19), the bottom plate
(19) multiple drainage holes (20) are equipped with；Rotation pipe (18) bottom side of the wall is equidistant around equipped with multiple branch pipes (11), institute
Branch pipe (11) one end is stated equipped with external screw thread, the branch pipe (11) is by being set to the tapped through hole of rotation pipe (18) bottom side of the wall and turning
Dynamic pipe (18) is fixedly connected, and is equipped with multiple drainage holes (20) below the branch pipe (11).
2. a kind of automatic backwash sandrock filter according to claim 1, it is characterised in that: below the branch pipe (11)
Drainage hole (20) equidistantly distributed, drainage hole (20) the distribution setting is immediately below branch pipe (11) and in the cambered surface of lower section.
3. a kind of automatic backwash sandrock filter according to claim 1, it is characterised in that: below the tank body (3)
Equipped with water outlet, the water outlet is connected to outlet pipe (9)；The water inlet upper end is connected to threeway hydraulic control valve (14),
The water inlet pipe (1), sewage pipe (2) are connected to threeway hydraulic control valve (14)；Tank body (3) the inner cavity lower part is equipped with holes
Partition (6), partition (6) top, which is equipped with below casting bed (4), is equipped with water-purifying cavity (7)；Partition (6) upper surface is equipped with multiple
Filter cap (5), filter cap (5) lower end are connected to by partition (6) hole with water-purifying cavity (7).
4. a kind of automatic backwash sandrock filter according to claim 3, it is characterised in that: the water outlet and water outlet
It manages (9) to connect by flange (8), the water inlet is connect with threeway hydraulic control valve (14) by flange (8).
5. a kind of automatic backwash sandrock filter according to claim 3, it is characterised in that: the filter cap (5) is cone
Shape, filter cap (5) side are equipped with a plurality of opening.
6. a kind of automatic backwash sandrock filter according to claim 3, it is characterised in that: the casting bed (4) is by stone
Sand grain is accumulated.
7. a kind of automatic backwash sandrock filter according to claim 1, it is characterised in that: the tank body (3) can be with
A number of tank body (3) connects, and the water inlet pipe (1), outlet pipe (9) and sewage pipe (2) between the tank body (3) are interconnected.
8. a kind of automatic backwash sandrock filter according to claim 1, it is characterised in that: on the sand loading mouth (12)
Equipped with cover board (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822192519.0U CN209423036U (en) | 2018-12-20 | 2018-12-20 | A kind of automatic backwash sandrock filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822192519.0U CN209423036U (en) | 2018-12-20 | 2018-12-20 | A kind of automatic backwash sandrock filter |
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| Publication Number | Publication Date |
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| CN209423036U true CN209423036U (en) | 2019-09-24 |
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ID=67973543
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822192519.0U Active CN209423036U (en) | 2018-12-20 | 2018-12-20 | A kind of automatic backwash sandrock filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797196A (en) * | 2022-05-18 | 2022-07-29 | 中国农业科学院农田灌溉研究所 | Automatic dirt-absorbing micro-irrigation sand-stone filter |
-
2018
- 2018-12-20 CN CN201822192519.0U patent/CN209423036U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797196A (en) * | 2022-05-18 | 2022-07-29 | 中国农业科学院农田灌溉研究所 | Automatic dirt-absorbing micro-irrigation sand-stone filter |
| CN114797196B (en) * | 2022-05-18 | 2023-11-28 | 中国农业科学院农田灌溉研究所 | Automatic dirt-sucking micro-irrigation sand filter |
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