CN208809571U - A kind of full-automatic back washing filter - Google Patents
A kind of full-automatic back washing filter Download PDFInfo
- Publication number
- CN208809571U CN208809571U CN201821006793.8U CN201821006793U CN208809571U CN 208809571 U CN208809571 U CN 208809571U CN 201821006793 U CN201821006793 U CN 201821006793U CN 208809571 U CN208809571 U CN 208809571U
- Authority
- CN
- China
- Prior art keywords
- filter
- blowdown valve
- interior
- flow guiding
- guiding disc
- 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.)
- Active
Links
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The utility model discloses a kind of full-automatic back washing filters, filtering chamber body (4) including built-in filter assemblies (3), filter assemblies (3) include several filter elements of filtering mandrel (25) and setting on filtering mandrel (25) side wall, each filter element be include outer flow guiding disc (26), the five-layer structure of filter net sheet (27) and interior flow guiding disc (28), the lower section of filter chamber's pedestal 8 is connected with the blowdown valve (6) being connected to filter assemblies (3), the blowdown valve rod of double-layer structure is connected in blowdown valve (6), outer blowdown valve rod (14) is fixedly connected with mobile base (9), interior blowdown valve rod (15) is axially connect by transmission gear (19) with electric motor (16), the valve rod mudhole there are four Corresponding matching is opened on inside and outside blowdown valve rod.The utility model has the beneficial effects that filtering accuracy is high, automation control is not necessarily to manual intervention, and easy to operate, labor intensity is low.
Description
Technical field
The utility model relates to a kind of filter device in filter plant technical field, in particular to a kind of full-automatic back washing
Filter.
Background technique
In the filter plant design of high temperature, high pressure, high-viscosity material (such as plastic cement) industry, to improve making for filter plant
With service life and working efficiency, favor of the anti-cleaning and filtrating equipment just by vast company.Anti- cleaning and filtrating equipment is to work as filter screen
When the filtrate pollutant of upper obstruction reaches a certain amount of, the pollutant stopped is removed by back flush, is allowed to pollutant from blowdown
A kind of device of mouth discharge.It is not in that pollutant seeps during blowdown that the filter device of high filtering precision, which requires waste removal equipment,
Phenomenon being leaked, while material to be filtered need to fully enter filter assemblies filtering, filtered material is not in secondary pollution, because
This, high-precision filtration equipment has very high requirement to the sealing performance of filter chamber and blowdown valve body.
On existing market, it counter can be cleaned and filter device that filtering accuracy is high is less, 201832471 U of patent CN
A kind of hollow filtering table and the cascading type filter using the filtering table are disclosed, but the device needs to be equipped with the mistake of high voltage
Strainer, higher cost；Simultaneously in anti-cleaning process, filter screen is easy to fall off, influence using.Patent CN201521058339.3
Disclose a kind of disc shaped cascading type filter, although can be realized anti-cleaning, need by exchange inlet and outlet into
The cleaning of row filter screen, can not automatic washing, it is troublesome in poeration.
Utility model content
It is needed for defect present in existing anti-cleaning and filtrating equipment and reality, the utility model provides a kind of full-automatic
Backflushing filter.
To achieve the goals above, the measure that the utility model is taken:
A kind of full-automatic back washing filter, the filtering chamber body including built-in filter assemblies, filters the upper and lower ends of chamber body
Mating connection filter chamber upper end cover and filter chamber's pedestal are sealed respectively, are provided with feed inlet on filter chamber's pedestal, are filtered chamber body
Discharge port is provided on upper side wall, filter chamber body outside be socketed with to filtering chamber body heating heating agent collet, the one of heating agent collet
Side lower end is provided with Heating medium, and the other side upper end of heating agent collet is provided with heating agent outlet, is connected on filter chamber's upper end cover
Filter assemblies are pressed on the intracorporal filter assemblies pressing device in filter chamber, filter assemblies include the filtering mandrel of inner hollow,
The hollow space of filtering mandrel is connected to feed inlet, is filtered and is connected with several independent filter elements, mistake on the side wall of mandrel
The top of filter shaft is provided with disc gland, and each filter element is to press one by outer flow guiding disc, filter net sheet and interior flow guiding disc
The fixed five-layer structure being formed by stacking that sequentially interlocks, flow guiding disc in the annular including filter element center is arranged in, interior flow guiding disc two
Side is respectively provided with a filter net sheet, and the outer flow guiding disc of an annular, the disk of interior flow guiding disc are each provided on the outside of each filter net sheet
It is provided with several interior diversion trenches on face, offers on the inner circle side wall of interior flow guiding disc and is led in several connections corresponding with interior diversion trench
Discharge orifice is provided with several outer diversion trenches in the disk of outer flow guiding disc, several is offered on the outer circle side wall of outer flow guiding disc and is led outside
The outer deflector hole of the corresponding connection of chute, filters and is provided with a circle aperture on mandrel with the corresponding position of interior flow guiding disc, and aperture passes through two
Gap between block filter net sheet is connected with interior deflector hole, is sealedly connected with below filter chamber's pedestal and is connected to filter assemblies
Blowdown valve, is connected with the blowdown valve collet that filling thermal medium is socketed with outside the blowdown valve of sewage draining exit in lower wall, in blowdown valve
It is sealedly connected with blowdown valve rod, blowdown valve rod is the double-layer structure for including interior blowdown valve rod and outer blowdown valve rod, outer blowdown valve rod
By flange with can be fixedly connected along the blowdown valve mobile base that blowdown valve axis moves up and down, interior blowdown valve rod passes through transmission
Gear is axially connect with the electric motor being connected in blowdown valve mobile base, and transmission gear is electrically connected with pulsed encoder,
Same cross-section on outer blowdown valve rod and interior blowdown valve rod opens the valve rod mudhole there are four Corresponding matching；
The interior diversion trench is uniformly distributed in the disk of interior flow guiding disc, and interior deflector hole identical with interior diversion trench number is equal
Even to be distributed on interior flow guiding disc inner circle side wall, interior diversion trench is the tree structure of one of notch outer layer multiple tracks notch of internal layer, often
The internal layer notch of a interior diversion trench is corresponding with an interior deflector hole to be connected to, and the outer diversion trench is uniformly distributed the disk in outer flow guiding disc
On face, outer deflector hole identical with outer diversion trench number is uniformly distributed on outer flow guiding disc outer circle side wall, and outer diversion trench is interior
The "-" type structure of outer layer only one notch；
The discharge outlet is provided with the collet exhaust valve being connected to filtering chamber body；
The blowdown valve and filter chamber's pedestal junction are compressed by upper sealing gland, filled with upper gland packing, blowdown
The end of valve and outer blowdown valve rod junction compressed by lower sealing gland, filled with lower airtight and watertight padding, the filtering chamber body and
O-ring seal is provided between filter chamber's upper end cover, between filtering chamber body and filter chamber's pedestal；
The pulsed encoder is increment photoelectric pulsed encoder.
The utility model has the beneficial effects that the upper and lower ends of blowdown valve body be respectively arranged together seal, guarantee blowdown valve body with
Phenomena such as being not in leakage between blowdown valve rod, good seal performance；Filter assemblies can be pressed on by filter assemblies pressing device
In filter chamber's body, it is made to form the filtration channel of a closure with filter chamber's body, filter assemblies are not in loosen, and guarantee to enter
Material can fully enter filter assemblies filtering, be not in into material be directly entered filtering chamber body and be discharged, discharge simultaneously
The collet exhaust valve being connected to filtering chamber body is provided at mouthful, before starting filtering, opening exhaust valve can exclude to filter indoor air,
The vacuum state of filter chamber can ensure that filter material is not in secondary pollution in filter chamber, and filtering accuracy is high；Filter screen is clear
Without exchanging inlet and outlet during washing, the opening and closing of blowdown valve is controlled by pulsed encoder, automation control, without artificial dry
In advance, easy to operate, labor intensity is low.
Detailed description of the invention
The structural schematic diagram of Fig. 1 the utility model；
The structural schematic diagram of blowdown valve in Fig. 2 the utility model；
The structural schematic diagram of filter assemblies in Fig. 3 the utility model.
The partial structural diagram of filter assemblies in Fig. 4 the utility model；
The structural schematic diagram of Fig. 5 the utility model China and foreign countries flow guiding disc；
The structural schematic diagram of interior flow guiding disc in Fig. 6 the utility model.
In figure, 1, filter assemblies pressing device；2, filter chamber's upper end cover；3, filter assemblies；4, chamber body is filtered；5, heating agent
Collet；6, blowdown valve；7, collet exhaust valve；8, filter chamber's pedestal；9, blowdown valve mobile base；10, Heating medium；11, heating agent
Outlet；12, feed inlet；13, discharge port；14, outer blowdown valve rod；15, interior blowdown valve rod；16, electric motor；17, sewage draining exit；
18, blowdown valve collet；19, transmission gear；20, pulsed encoder；21, upper gland packing；22, upper sealing gland；23, close under
Packing material；24, lower sealing gland；25, mandrel is filtered；26, outer flow guiding disc；27, filter net sheet；28, interior flow guiding disc；29, disc
Gland；30, outer diversion trench；31, outer deflector hole；32, interior diversion trench；33, interior deflector hole.
Specific embodiment
To overcome defect present in existing anti-cleaning and filtrating equipment, meets real needs, design a kind of full-automatic recoil
It washes filter (such as FIG. 1 to FIG. 6), the filtering chamber body 4 including built-in filter assemblies 3, the upper and lower ends of filtering chamber body 4 seal respectively
Mating connection filter chamber upper end cover 2 and filter chamber's pedestal 8, are provided with feed inlet 12 on filter chamber's pedestal 8, filtering chamber body 4 it is upper
Discharge port 13 is provided on side wall, the outside of filtering chamber body 4 is socketed with the heating agent collet 5 heated to filtering chamber body 4, heating agent collet 5
Side lower end be provided with Heating medium 10, the other side upper end of heating agent collet 5 is provided with heating agent outlet 11, filter chamber upper end
Be connected with the filter assemblies pressing device 1 filter assemblies 3 being pressed in filtering chamber body 4 on lid 2, filter assemblies 3 include inside
The hollow space of hollow filtering mandrel 25, filtering mandrel 25 is connected to feed inlet 12, is filtered and is connected on the side wall of mandrel 25
Several independent filter elements, the top of filtering mandrel 25 are provided with disc gland 29, and each filter element is by leading outside
The five-layer structure that flow table 26, filter net sheet 27 and interior flow guiding disc 28 are staggeredly formed by stacking in certain sequence, including setting are being filtered
Flow guiding disc 28 in the annular of unit center, interior 28 two sides of flow guiding disc are respectively provided with a filter net sheet 27, each filter net sheet 27
Outside is each provided with the outer flow guiding disc 26 of an annular, is provided with several interior diversion trenches 32, interior flow guiding disc in the disk of interior flow guiding disc 28
The interior deflector hole 33 of several connections corresponding with interior diversion trench 32, the disk of outer flow guiding disc 26 are offered on 28 inner circle side wall
On be provided with several outer diversion trenches 30, offered on the outer circle side wall of outer flow guiding disc 26 several it is corresponding with outer diversion trench 30 connection
Outer deflector hole 31, filters and is provided with a circle aperture on mandrel 25 with the corresponding position of interior flow guiding disc 28, and aperture passes through two pieces of filter screens
Gap between piece 27 is connected with interior deflector hole 33, and the lower section of filter chamber's pedestal 8 is sealedly connected with the row being connected to filter assemblies 3
Dirty valve 6 is connected with the blowdown valve collet 18 that filling thermal medium is socketed with outside the blowdown valve 6 of sewage draining exit 17, blowdown in lower wall
Blowdown valve rod is sealedly connected in valve 6, blowdown valve rod is the double-layer structure for including interior blowdown valve rod 15 and outer blowdown valve rod 14, outside
Blowdown valve rod 14 by flange with can be fixedly connected along the blowdown valve mobile base 9 that blowdown valve axis moves up and down, interior blowdown
Valve rod 15 is axially connect by transmission gear 19 with the electric motor 16 being connected in blowdown valve mobile base 9, transmission gear 19
It is electrically connected with pulsed encoder 20, there are four the same cross-section on outer blowdown valve rod 14 and interior blowdown valve rod 15 is opened
The valve rod mudhole of Corresponding matching；The interior diversion trench 32 is uniformly distributed in the disk of interior flow guiding disc 28, with interior diversion trench 32
The identical interior deflector hole 33 of number is uniformly distributed on interior 28 inner circle side wall of flow guiding disc, and interior diversion trench 32 is one of notch of internal layer
The tree structure of outer layer multiple tracks notch, the internal layer notch of each interior diversion trench 32 is corresponding with an interior deflector hole 33 to be connected to, described
Outer diversion trench 30 is uniformly distributed in the disk of outer flow guiding disc 26, and outer deflector hole 31 identical with 30 numbers of outer diversion trench is uniform
It is distributed on outer 26 outer circle side wall of flow guiding disc, outer diversion trench 30 is the "-" type structure of ectonexine only one notch；Institute
State the collet exhaust valve 7 for being provided at discharge port 13 and being connected to filtering chamber body 4；The blowdown valve 6 is connect with filter chamber's pedestal 8
Place is compressed by upper sealing gland 22, filled with upper gland packing 21, the end of blowdown valve 6 and outer 14 junction of blowdown valve rod
It compressed by lower sealing gland 24, be filled with lower airtight and watertight padding 23, between the filtering chamber body 4 and filter chamber's upper end cover 2, filtered
O-ring seal is provided between chamber body 4 and filter chamber's pedestal 8；The pulsed encoder 20 is increment photoelectric pulsed
Encoder.
Working principle of the utility model is: in filter process, the material of filtering from feed inlet 12 enter filtering mandrel 25 it
In, it is then uniformly flowed into every layer of interior flow guiding disc 28 by interior deflector hole 33, is evenly distributed to each of interior diversion trench 32
Corner, the filter net sheet 27 that material passes through interior 28 two sides of flow guiding disc under the effect of the pressure are flowed into outer flow guiding disc 26, finally
It is flowed in filtering chamber body 4 by outer diversion trench 30 and outer deflector hole 31, impurity stays in interior diversion trench 32.In cleaning process, Gu
Surely the outer blowdown valve rod 14 being connected in blowdown valve mobile base 9 can be with mobile base 9 together in certain stroke along blowdown
Valve axis moves up and down, and cleans the impurity in filter chamber in each layer of filter screen, interior blowdown valve rod 15 can not only be with outer blowdown
Valve rod 14 is moved up and down together and can also be rotated by the effect of electric motor 16 and transmission gear 19 along axis.When inside and outside
When four mudholes on valve rod are all overlapped, blowdown valve is shown in a fully open operation, and cleaning sullage flows to sewage draining exit 17 from mudhole；
When rotating interior blowdown valve rod 15, when inside and outside valve rod mudhole is in 45 degree of intersection, blowdown valve is in the completely closed state；Pulsed
Encoder 20 adjusts the aperture (rotational angle of blowdown valve rod 4 in i.e.) of blowdown valve rod in real time as needed, to balance filtered
Expect pressure oscillation.
The utility model has the beneficial effects that the upper and lower ends of blowdown valve body be respectively arranged together seal, guarantee blowdown valve body with
Phenomena such as being not in leakage between blowdown valve rod, good seal performance；Filter assemblies can be pressed on by filter assemblies pressing device
In filter chamber's body, it is made to form the filtration channel of a closure with filter chamber's body, filter assemblies are not in loosen, and guarantee to enter
Material can fully enter filter assemblies filtering, be not in into material be directly entered filtering chamber body and be discharged, discharge simultaneously
The collet exhaust valve being connected to filtering chamber body is provided at mouthful, before starting filtering, opening exhaust valve can exclude to filter indoor air,
The vacuum state of filter chamber can ensure that filter material is not in secondary pollution in filter chamber, and filtering accuracy is high；Filter screen is clear
Without exchanging inlet and outlet during washing, the opening and closing of blowdown valve is controlled by pulsed encoder, automation control, without artificial dry
In advance, easy to operate, labor intensity is low.
Simply changing and replacing for those ordinary skill in the art is all within the protection scope of the utility model.
Claims (5)
1. a kind of full-automatic back washing filter, the filtering chamber body (4) including built-in filter assemblies (3) filter the upper of chamber body (4)
Lower both ends seal mating connection filter chamber upper end cover (2) and filter chamber's pedestal (8) respectively, be provided on filter chamber's pedestal (8) into
Material mouth (12) filters and is provided with discharge port (13) on the upper side wall of chamber body (4), which is characterized in that the external socket of filtering chamber body (4)
There is the heating agent collet (5) to filtering chamber body (4) heating, the side lower end of heating agent collet (5) is provided with Heating medium (10), heating agent
The other side upper end of collet (5) is provided with heating agent outlet (11), is connected on filter chamber's upper end cover (2) and presses filter assemblies (3)
The tightly filter assemblies pressing device (1) in filtering chamber body (4), filter assemblies (3) include the filtering mandrel (25) of inner hollow,
The hollow space of filtering mandrel (25) is connected to feed inlet (12), and it is independent to be connected with several on the side wall of filtering mandrel (25)
Filter element, filtering mandrel (25) top be provided with disc gland (29), each filter element be by outer flow guiding disc (26),
The five-layer structure that filter net sheet (27) and interior flow guiding disc (28) are staggeredly formed by stacking in certain sequence, including be arranged in filter element
Flow guiding disc (28) in the annular at center, interior flow guiding disc (28) two sides are respectively provided with a filter net sheet (27), each filter net sheet
(27) it is each provided with the outer flow guiding disc (26) of an annular on the outside of, is provided with several interior diversion trenches in the disk of interior flow guiding disc (28)
(32), the interior deflector hole of several connections corresponding with interior diversion trench (32) is offered on the inner circle side wall of interior flow guiding disc (28)
(33), it is provided with several outer diversion trenches (30) in the disk of outer flow guiding disc (26), is offered on the outer circle side wall of outer flow guiding disc (26)
The outer deflector hole (31) of several connections corresponding with outer diversion trench (30) is filtered corresponding with interior flow guiding disc (28) on mandrel (25)
Position is provided with a circle aperture, and aperture is connected by the gap between two pieces of filter net sheets (27) with interior deflector hole (33), filter chamber
It is sealedly connected with the blowdown valve (6) being connected to filter assemblies (3) below pedestal (8), is connected with sewage draining exit (17) in lower wall
Blowdown valve (6) outside be socketed with the blowdown valve collet (18) of filling thermal medium, is sealedly connected with blowdown valve in blowdown valve (6)
Bar, blowdown valve rod are the double-layer structure for including interior blowdown valve rod (15) and outer blowdown valve rod (14), and outer blowdown valve rod (14) passes through
Flange with can be fixedly connected along the blowdown valve mobile base (9) that blowdown valve axis moves up and down, interior blowdown valve rod (15) passes through
Transmission gear (19) axially connect with the electric motor (16) that is connected on blowdown valve mobile base (9), transmission gear (19) and
Pulsed encoder (20) is electrically connected, and the same cross-section on outer blowdown valve rod (14) and interior blowdown valve rod (15) is provided with four
The valve rod mudhole of a Corresponding matching.
2. a kind of full-automatic back washing filter according to claim 1, which is characterized in that the interior diversion trench (32) is equal
In the even disk for being distributed in interior flow guiding disc (28), interior deflector hole (33) identical with interior diversion trench (32) number is uniformly distributed in interior
On flow guiding disc (28) inner circle side wall, interior diversion trench (32) is the tree structure of one of notch outer layer multiple tracks notch of internal layer, each
The connection corresponding with one interior deflector hole (33) of the internal layer notch of interior diversion trench (32), the outer diversion trench (30) are uniformly distributed outside
In the disk of flow guiding disc (26), outer deflector hole (31) identical with outer diversion trench (30) number is uniformly distributed in outer flow guiding disc (26)
On outer circle side wall, outer diversion trench (30) is the "-" type structure of ectonexine only one notch.
3. a kind of full-automatic back washing filter according to claim 1 or 2, which is characterized in that the discharge port (13)
Place is provided with the collet exhaust valve (7) being connected to filtering chamber body (4).
4. a kind of full-automatic back washing filter according to claim 3, which is characterized in that the blowdown valve (6) and mistake
Filter chamber pedestal (8) junction is compressed by upper sealing gland (22), is filled with upper gland packing (21), the end of blowdown valve (6)
It compressed with outer blowdown valve rod (14) junction by lower sealing gland (24), be filled with lower airtight and watertight padding (23), the filter chamber
O-ring seal is provided between body (4) and filter chamber's upper end cover (2), between filtering chamber body (4) and filter chamber's pedestal (8).
5. a kind of full-automatic back washing filter according to claim 3, which is characterized in that the pulsed encoder
It (20) is increment photoelectric pulsed encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821006793.8U CN208809571U (en) | 2018-06-27 | 2018-06-27 | A kind of full-automatic back washing filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821006793.8U CN208809571U (en) | 2018-06-27 | 2018-06-27 | A kind of full-automatic back washing filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208809571U true CN208809571U (en) | 2019-05-03 |
Family
ID=66270161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821006793.8U Active CN208809571U (en) | 2018-06-27 | 2018-06-27 | A kind of full-automatic back washing filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208809571U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110639258A (en) * | 2018-06-27 | 2020-01-03 | 浙江宇丰机械有限公司 | Full-automatic back flush filter |
| CN117101217A (en) * | 2023-10-23 | 2023-11-24 | 泉州威可赛机械科技有限公司 | High compression resistance filtering component for backwashing filter |
-
2018
- 2018-06-27 CN CN201821006793.8U patent/CN208809571U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110639258A (en) * | 2018-06-27 | 2020-01-03 | 浙江宇丰机械有限公司 | Full-automatic back flush filter |
| CN117101217A (en) * | 2023-10-23 | 2023-11-24 | 泉州威可赛机械科技有限公司 | High compression resistance filtering component for backwashing filter |
| CN117101217B (en) * | 2023-10-23 | 2023-12-19 | 泉州威可赛机械科技有限公司 | High compression resistance filtering component for backwashing filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208809571U (en) | A kind of full-automatic back washing filter | |
| CN105972804B (en) | A kind of filter screen replacement device | |
| CN207203613U (en) | A kind of back-flushing filtering system | |
| CN111686498A (en) | High-pressure filter | |
| CN209286779U (en) | A kind of duplex switching type filter | |
| CN110639258A (en) | Full-automatic back flush filter | |
| CN108096897A (en) | The more filtering element self-cleaning filters of suctorial type | |
| CN206881275U (en) | A kind of more filter core automatic backwashing filters | |
| CN205145717U (en) | Disk filter | |
| CN108744650A (en) | A kind of soft knife filter of online deslagging self-cleaning of artificial intelligent type | |
| CN202909524U (en) | Filter-cartridge scraping-brushing type self-cleaning filter | |
| CN215213639U (en) | Semi-automatic cleaning filter | |
| CN115040907A (en) | Filtering equipment of flow regulating valve and use method | |
| CN208770947U (en) | A kind of soft knife filter of online deslagging self-cleaning of artificial intelligent type | |
| CN105396353B (en) | High-viscosity material full-automatic back washing coarse filtration system | |
| CN101632882A (en) | Automatic cleaning and filtering device without power and filtering system using same | |
| CN201516315U (en) | Full automatic metal filter | |
| CN208770946U (en) | A kind of soft knife filter of the self-cleaning that Full-automatic filter drains slag | |
| CN209020047U (en) | A kind of Environmental Monitoring Laboratory water sample processing unit | |
| CN209155289U (en) | The automatic cleaning filtration system of raw material molding | |
| CN204601756U (en) | Full-automatic high-precision filter | |
| CN2463024Y (en) | Totally-enclosed pressing partitionless multi-layer filtering elements filter | |
| CN207286827U (en) | Auto purification type filter | |
| CN208049486U (en) | The more filtering element self-cleaning filters of suctorial type | |
| CN208331308U (en) | A kind of backwash blowdown valve rod assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |