CN108483627A - A kind of multiple anti-clogging strainer head of down-mounting type - Google Patents
A kind of multiple anti-clogging strainer head of down-mounting type Download PDFInfo
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- CN108483627A CN108483627A CN201810586088.8A CN201810586088A CN108483627A CN 108483627 A CN108483627 A CN 108483627A CN 201810586088 A CN201810586088 A CN 201810586088A CN 108483627 A CN108483627 A CN 108483627A
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- Prior art keywords
- filter
- cavity
- filter rod
- head
- blocking
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- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000003475 lamination Methods 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 238000005728 strengthening Methods 0.000 claims abstract description 4
- 230000007774 longterm Effects 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000000706 filtrate Substances 0.000 description 8
- 239000002657 fibrous material Substances 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a kind of multiple anti-clogging strainer heads of down-mounting type, it includes anti-blocking filter cover cap, strainer head, cavity base cylinder；The strainer head is made of anti-blocking filter head and the anti-blocking filter rod of cavity；The anti-blocking filter rod of the cavity includes deflation pressure release section cavity filter rod, nut segment cavity filter rod, taper platform seal section cavity filter rod, outer silk thread segment cavity filter rod, cavity spiral lamination strengthening segment filter rod；The anti-blocking filter head includes that round table-like filter sealing is pushed up, several lateral overcurrents filters are stitched, several longitudinally connected section；The strainer head is threadedly coupled by outer silk thread segment cavity filter rod with cavity base cylinder；The strainer head, by the taper platform of taper platform seal section cavity filter rod, the nut of the outer silk screw thread of outer silk thread segment cavity filter rod, nut segment cavity filter rod, carries out external force screw thread and squeezes plastic sealed with cavity base cylinder.The present invention fundamentally thoroughly solves the problems, such as the blocking of filter by unique structure innovation.
Description
Technical field
The invention belongs to technical field of sewage, and in particular to a kind of multiple anti-clogging strainer head of down-mounting type.
Background technology
In recent years, domestic sewage treatment industry biological aerated filter process is applied relatively broad, due to biological aerated filter
Process object be largely stain disease, but contain a large amount of suspended matters and fibrous material, these substances in general stain disease
All with tiny blocky, threadiness or cotton-shaped presence, including plastic wire, hairline, useless small paper scrap, plant fiber wall silk etc., when dirt is useless
When water enters filter rod inner cavity by strainer head filter rod lower end and flows upwardly into filter cap inner cavity, these suspended matters or fibrous material are very
It is easy to be trapped within filter cap or filter inner cavity water gap is crossed into the bar shaped of filter cap or filter and block；When blocked strainer head number
When measuring more, it is possible to cause in normal course of operation that water distribution is uneven on the section of bed rearrangement filter tank, while can also greatly increase and be
The head loss of system；Especially led in combined water and air backwash since the blocking of strainer head causes water distribution, gas distribution uneven
It causes the filter material layer of biological aerated filter that cannot uniformly be rinsed and so that filter material layer is generated hardened, seriously affects process operation and not
It can guarantee that effluent quality is up to standard.
Example one, traditional long Handle filter head special for aeration biological filter pool (ZL02293036.1) are provided with filter cap, due to operation
The filter gap of its filter cap is blocked often in the process, and this kind of strainer head is to be fixed on filter plate downwards from filter plate top
On, upper part also heap is filled with the filtrate of 3~4m high, when strainer head, which is blocked, influences operation, need to clear up it, but
It needs to dig out all filtrates out of filter tank before cleaning and could carry out cleaning work, cleaning trouble, working efficiency are low.Example two,
In patent disclosed in CN203474523, there are the problem of have：(1) it is still additionally provided with into water filter cap, the easily a large amount of threadinesss of retention
Object, causing to overhaul cumbersome, filter tank has hardened risk；(2) seal is poor between strainer head and cavity base cylinder, and the two cannot be fine
Sealing, causes high strong gas pressure when backwash, hydraulic pressure to be revealed from this gap, pressure release, and then reduces flow, the throughput of filter,
The rate for reducing its cutting fibrous object and biomembrane is not easy to wash away fibrous material and biomembrane etc., easily causes filter stifled
Plug, filter tank are hardened；(3) when long-term gas and water backwash, due to the mutual flowage friction of filtrate, supporting layer cobblestone, lead to support
Layer, filtrate mixed bed；Filter overcurrent gap part is worn away, filtrate is caused directly to enter filter tank water distribution by cavity body by one side's meeting
Room；On the other hand, the fibrous material of filter retention or overcurrent wraps up retention by the filtrate outside filter, can not effectively be released
It puts, it is hardened so as to cause filter blocking, filter tank.Example three, in patent disclosed in CN203803220U, strainer head and cavity base
The service life of cylinder gasket seal is low, due to being chronically under the effects that various hyperbars, high hydraulic pressure and microbiological oxidation restore, gasket
Easily aging, so as to cause series of problems such as example two (2) seal differences.
Therefore, exploitation one kind do not need filter cap, thoroughly solve filter blockage problem, repair rate is low, maintenance is convenient, closed
Property good and long lifespan, dismounting and multiple anti-clogging strainer head easy to assembly there is very great innovation meaning.
Invention content
In view of the deficiencies of the prior art, the present invention proposes a kind of multiple anti-clogging strainer head of down-mounting type.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of multiple anti-clogging strainer head of down-mounting type, it includes anti-blocking filter cover cap, strainer head, cavity base cylinder；Institute
Strainer head is stated to be made of anti-blocking filter head and the anti-blocking filter rod of cavity；The anti-blocking filter cover cap passes through mechanical connection with cavity base cylinder
Mode is screw connection or snaps connection；The anti-blocking filter rod of the cavity includes deflation pressure release section cavity filter rod, nut segment cavity
Filter rod, taper platform seal section cavity filter rod, outer silk thread segment cavity filter rod, cavity spiral lamination strengthening segment filter rod；Described is anti-blocking
Filter includes that round table-like filter sealing is pushed up, several lateral overcurrents filters are stitched, several longitudinally connected section；The dry item transverse direction mistake
Stream filter slit shape is wedge shape, in interior thick outer thin；Connection breaking is arranged between longitudinally connected section of described several and lateral overcurrent filter seam；
The strainer head is threadedly coupled by outer silk thread segment cavity filter rod with cavity base cylinder；The strainer head with
Cavity base cylinder passes through the taper platform of taper platform seal section cavity filter rod, outer silk screw thread, the nut of outer silk thread segment cavity filter rod
The nut of section cavity filter rod carries out external force screw thread and squeezes plastic sealed, ensuring safety property long term seal；The deflation pressure release section cavity
Filter rod is respectively equipped with bar shaped deflation relief hole, taper deflation relief hole.
The lateral overcurrent filter seam is at least 2, and described longitudinally connected section is at least 1 section.
The anti-blocking filter cover cap is stitched equipped with a plurality of block, and block stitches the longitudinally wide overcurrent more than anti-blocking filter head and filters seam
Width, but the diameter for the filler being slightly less than outside anti-blocking filter cover cap.
The outside sectional area of the lateral overcurrent filter board splitter shape is at least 1.5 times of outside sectional area size, ensures
Inside flow velocity is not less than 0.25m/s, and the cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam ensures outside flow velocity not
Less than 0.10m/s；When backwash, the cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam ensures that inside flow velocity is not less than
The cross-sectional dimension size of 0.50m/s, the wedge shape of lateral overcurrent filter seam ensure that outside flow velocity is not less than 0.2m/s.
The taper platform level angle of the taper platform seal section cavity filter rod is 30~70 °.
The cavity base cylinder and the filter plate in filter tank carry out pre-buried connection.
The block seam substrate carries out detachable mechanical connection with cavity base cylinder.
The bar shaped deflation relief hole is placed in deflation pressure release section cavity filter rod lower end, and quantity is at least 1；The taper
Deflation relief hole is placed in upper end in deflation pressure release section cavity filter rod, and quantity is at least 2, and taper deflation relief hole diameter is from bottom to top
In tapered trend, the upper end toper deflation a diameter of 0.5~0.8cm of the external vertex of a cone, cone bottom diameter is 0.2~0.3cm.
Beneficial effects of the present invention：
1, by a large amount of experimental study, optimal duty parameter is obtained, and the lateral overcurrent on filter surface is filtered into board splitter
Shape realizes the optimum condition parameter for wanting to obtain by the structure design of innovation；On the one hand, normal treated sewage or filter tank backwash
When, using the inside and outside difference different in flow rate of wedge shape, to form huge hydraulic shear, eddy flow power, inside and outside pressure difference, directly
By a large amount of fibrous direct shearings of filter transverse direction overcurrent filter seam retention are washed away, normal pressure is discharged, negative pressure is sucked out to filter overcurrent
The outside for filtering seam thoroughly solves filter blockage problem from source, realizes first most basic anti-clogging function；Another party
Face not only directly saves filter cap, and the retention without filter cap can be solved filter blockage problem, while saving later stage dismounting filter
The related problem and expense of cap maintenance；Again, the innovative design of filter transverse direction overcurrent filter wedge shape reduces a large amount of water damage, gas
Loss, it is more conducively energy-saving.
2, experimental study is constantly repeated by simulation, model machine, obtains optimal taper corner of table degree control parameter, utilizes inside and outside spiral shell
The progressive external force screw thread that silk nut tightens the taper platform of the taper platform seal section cavity filter rod of fixation and innovative design squeezes modeling
Property sealing, directly solve the problems, such as seal difference between strainer head and cavity base cylinder from source, instead of tradition such as rubber
The short problem of service life of sealing, ensure that high strong gas pressure when backwash, hydraulic pressure will not be revealed from this gap, pressure release, simultaneously
Also side face ensures again the normal mechanism operating of the sundries such as fibrous material, the biomembrane of filter retention cleared up automatically；It is real
Secondary anti-clogging function is showed.
3, anti-blocking filter cover cap design, is lost the mutual flowage friction stitched by filtrate, supporting layer cobblestone, filter overcurrent
Play the role of umbrella, avoid filtrate and filter tank distributing water room is directly entered by cavity body, while ensure that filter wedge shape
The release of outer row's fibrous material of overcurrent seam, avoids it and is wrapped in filter outer surface；In addition, protecting matching for multigroup filter
Water, distribution uniformity；Realize the anti-clogging function of third time aspect.
4, the Multiple Optimization Design of deflation pressure release section not only, effectively eliminates vapour lock, avoids air cushion layer to water inlet energy consumption
Waste；The optimization innovative design that bellmouth differs also ensures that deflation sector hole is not easy to plug；The Combination Design of module and lower dress
Assembly, dismounting mode so that filter assembling, accessory alternative costs and workload substantially reduce；With larger engineer application
Value, produces larger economic benefit.
Description of the drawings
Fig. 1：A kind of multiple anti-clogging strainer head of down-mounting type
1 anti-blocking filter head block, 2 strainer heads, 3 cavity base cylinders；
Fig. 2：Anti-blocking filter head block
Substrate is stitched in 1 anti-blocking filter head block, the top seal of the anti-blocking blocks of 1-1,1-2 blocks seam, 1-3 blocks；
Fig. 3：Strainer head
2-1 anti-blocking filter heads, the anti-blocking filter rod of 2-2 cavitys, 2-1-1 round table-like filter sealings top, 2-1-2 transverse direction overcurrents seam, 2-
Longitudinally connected section of 1-3,2-2-1 deflation pressure release section cavity filter rod, 2-2-2 nut segment cavity filter rods, 2-2-3 taper platforms seal section are empty
Chamber filter rod, the outer silk thread segment cavity filter rods of 2-2-4, the outer silk thread segment cavity filter rods of 2-2-5,2-1-1-1 bar shaped deflation relief holes,
2-1-1-2 taper deflation relief holes.
Specific implementation mode
Referring to Fig. 1, Fig. 2, Fig. 3, a kind of multiple anti-clogging strainer head 0 of down-mounting type, it include anti-blocking filter cover cap 1,
Strainer head 2, cavity base cylinder 3；The strainer head 2 is made of anti-blocking filter head 2-1 and the anti-blocking filter rod 2-2 of cavity；It is described anti-
Stifled filter cover cap 1 is screw connection by mechanical connection manner with cavity base cylinder 3 or snaps connection；The anti-blocking filter rod of the cavity
2-2 include deflation pressure release section cavity filter rod 2-2-1, nut segment cavity filter rod 2-2-2, taper platform seal section cavity filter rod 2-2-3,
Outer silk thread segment cavity filter rod 2-2-4, cavity spiral lamination strengthening segment filter rod 2-2-5；The anti-blocking filter head 2-1 includes round table-like
Filter sealing top 2-1-1, several lateral overcurrent filter seam 2-1-2, several longitudinally connected section of 2-1-3；The dry item is lateral
Overcurrent filter seam 2-1-2 shapes are wedge shape, in interior thick outer thin；Several described longitudinally connected section of 2-1-3 are stitched with lateral overcurrent filter
Connection breaking is arranged between 2-1-2；The strainer head 2 is carried out by outer silk thread segment cavity filter rod 2-2-4 and cavity base cylinder 3
It is threadedly coupled；The strainer head 2 and cavity base cylinder 3 pass through the taper platform 2-2-4 of taper platform seal section cavity filter rod, outer
The outer silk screw thread of silk thread segment cavity filter rod 2-2-3, the nut of nut segment cavity filter rod 2-2-2, carry out external force screw thread and squeeze modeling
Property sealing, ensuring safety property long term seal；The deflation pressure release section cavity filter rod 2-2-1 is respectively equipped with bar shaped deflation relief hole 2-2-
1-1, taper deflation relief hole 2-2-1-2.
The lateral overcurrent filter seam 2-1-2 is at least 2, and the longitudinally connected section of 2-1-3 is at least 1 section.
The anti-blocking filter cover cap 1 is equipped with a plurality of block and stitches 1-2, and the longitudinally wide mistakes more than anti-blocking filter head of 1-2 are stitched in block
Stream filter slit width 2-1-2, but the diameter for the filler being slightly less than outside anti-blocking filter cover cap.
The outside sectional area of the lateral overcurrent filter board splitter shape is at least 1.5 times of outside sectional area size, described
The cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam 2-1-2 can guarantee that inside flow velocity is not less than
The cross-sectional dimension size of 0.25m/s, the wedge shape of lateral overcurrent filter seam 2-1-2 can guarantee outside flow velocity not
Less than 0.10m/s；When backwash, the cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam 2-1-2 can guarantee interior effluent
Speed is not less than 0.50m/s, and the cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam 2-1-2 can guarantee outside flow velocity not
Less than 0.2m/s.
The taper platform level angle of the taper platform seal section cavity filter rod 2-1-1 is 30~70 °.
The cavity base cylinder 3 and the filter plate in filter tank carry out pre-buried connection.
The block seam substrate 1-3 carries out detachable mechanical connection with cavity base cylinder 3.
The bar shaped deflation relief hole 2-2-1-1 is placed in the lower ends deflation pressure release section cavity filter rod 2-2-1, and quantity is at least 1
It is a；The taper deflation relief hole 2-2-1-2 is placed in upper end in deflation pressure release section cavity filter rod, and quantity is at least 2, taper
Deflation relief hole 2-2-1-1 diameters are in tapered trend from bottom to top, the upper end toper deflate the external vertex of a cone a diameter of 0.5~
0.8cm, cone bottom diameter are 0.2~0.3cm.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand the content of the present invention and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to this hair
Equivalent change or modification made by bright Spirit Essence, should all be covered in the present invention and within protection domain.
Claims (8)
1. a kind of multiple anti-clogging strainer head of down-mounting type, it is characterised in that：It includes anti-blocking filter cover cap, strainer head, cavity
Pedestal cylinder；The strainer head is made of anti-blocking filter head and the anti-blocking filter rod of cavity；The anti-blocking filter cover cap is logical with cavity base cylinder
Mechanical connection manner is crossed to be screw connection or snap connection；The anti-blocking filter rod of the cavity include deflation pressure release section cavity filter rod,
Nut segment cavity filter rod, taper platform seal section cavity filter rod, outer silk thread segment cavity filter rod, cavity spiral lamination strengthening segment filter rod；
The anti-blocking filter head includes that round table-like filter sealing is pushed up, several lateral overcurrents filters are stitched, several longitudinally connected section；Described
Dry item transverse direction overcurrent filter slit shape is wedge shape, in interior thick outer thin；Between longitudinally connected section of described several and lateral overcurrent filter seam
Connection breaking is arranged；The strainer head is threadedly coupled by outer silk thread segment cavity filter rod with cavity base cylinder；It is described
Strainer head and cavity base cylinder by the taper platform of taper platform seal section cavity filter rod, outer silk thread segment cavity filter rod it is outer
The nut of silk screw thread, nut segment cavity filter rod carries out external force screw thread and squeezes plastic sealed, ensuring safety property long term seal；It is described to put
Gas pressure release section cavity filter rod is respectively equipped with bar shaped deflation relief hole, taper deflation relief hole.
2. requiring a kind of multiple anti-clogging strainer head of down-mounting type according to right 1, it is characterised in that：The lateral mistake
Stream filter seam is at least 2, and described longitudinally connected section is at least 1 section.
3. requiring a kind of multiple anti-clogging strainer head of down-mounting type according to right 1, it is characterised in that：The anti-blocking filter
Block is stitched equipped with a plurality of block, and block stitches the longitudinally wide overcurrent more than anti-blocking filter head and filters slit width, but is slightly less than anti-blocking filter cover cap
The diameter of outer filler.
4. the outside sectional area of lateral overcurrent filter board splitter shape described in is at least outside 1.5 times of sectional area size, ensure in
Effluent speed is not less than 0.25m/s, and the cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam ensures that outside flow velocity is not low
In 0.10m/s；When backwash, the cross-sectional dimension size of the wedge shape of lateral overcurrent filter seam ensures that inside flow velocity is not less than
The cross-sectional dimension size of 0.50m/s, the wedge shape of lateral overcurrent filter seam ensure that outside flow velocity is not less than 0.2m/s.
5. requiring a kind of multiple anti-clogging strainer head of down-mounting type according to right 1, it is characterised in that：The taper platform
The taper platform level angle of seal section cavity filter rod is 30~70 °.
6. requiring a kind of multiple anti-clogging strainer head of down-mounting type according to right 1, it is characterised in that：The cavity base
Cylinder and the filter plate in filter tank carry out pre-buried connection.
7. requiring a kind of multiple anti-clogging strainer head of down-mounting type according to right 1, it is characterised in that：Base is stitched in the block
Bottom carries out detachable mechanical connection with cavity base cylinder.
8. requiring a kind of multiple anti-clogging strainer head of down-mounting type according to right 1, it is characterised in that：The bar shaped is deflated
Relief hole is placed in deflation pressure release section cavity filter rod lower end, and quantity is at least 1；The taper deflation relief hole is placed in deflation and lets out
Upper end in section cavity filter rod, quantity is pressed to be at least 2, taper deflation relief hole diameter is in from bottom to top tapered trend, and described is upper
The end toper deflation a diameter of 0.5~0.8cm of the external vertex of a cone, cone bottom diameter are 0.2~0.3cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810586088.8A CN108483627A (en) | 2018-06-08 | 2018-06-08 | A kind of multiple anti-clogging strainer head of down-mounting type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810586088.8A CN108483627A (en) | 2018-06-08 | 2018-06-08 | A kind of multiple anti-clogging strainer head of down-mounting type |
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| CN108483627A true CN108483627A (en) | 2018-09-04 |
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|---|---|---|---|
| CN201810586088.8A Pending CN108483627A (en) | 2018-06-08 | 2018-06-08 | A kind of multiple anti-clogging strainer head of down-mounting type |
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