CN114177687B - Backwash device and pit filter - Google Patents
Backwash device and pit filter Download PDFInfo
- Publication number
- CN114177687B CN114177687B CN202111231795.3A CN202111231795A CN114177687B CN 114177687 B CN114177687 B CN 114177687B CN 202111231795 A CN202111231795 A CN 202111231795A CN 114177687 B CN114177687 B CN 114177687B
- Authority
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- China
- Prior art keywords
- filter
- spray
- pit
- pipe
- transfer line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000012530 fluid Substances 0.000 claims abstract description 67
- 239000007921 spray Substances 0.000 claims abstract description 66
- 238000011010 flushing procedure Methods 0.000 claims abstract description 31
- 238000004140 cleaning Methods 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 238000002955 isolation Methods 0.000 claims description 21
- 239000012634 fragment Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 238000003825 pressing Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
- B01D29/688—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with backwash arms or shoes acting on the cake side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nozzles (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to a back flushing device and a pit filter. The back flushing device comprises a fluid delivery pipeline and a spraying assembly; the fluid delivery line is used for accessing an external cleaning medium; the spray assembly is in communication with the fluid delivery line and is configured to spray a cleaning medium toward the pit filter. The back flushing device is communicated with the spray assembly and the fluid conveying pipeline to spray the cleaning medium, so that the back flushing device can be used for flushing the pit filter, thereby avoiding the pit filter from being blocked by fragments and damaging the normal operation of the containment pit filter pump, and further improving the filtering efficiency of the pit filter. The pit filter comprises a filter body and the back flushing device provided by the invention, wherein the back flushing device is arranged on the filter body, and the pit filter can avoid blockage caused by the generation of fragments due to the use of the back flushing device and has the advantages of high filtering efficiency and good filtering effect.
Description
Technical Field
The invention relates to the field of nuclear power engineering, in particular to a back flushing device and a pit filter.
Background
In the related art, a backwash device for a pit filter is generally to communicate a high-level water tank in a containment vessel with a pit filter member by using a backwash pipeline, and to inject water with a certain flow rate into the pit filter member by using power generated by the height difference between an IVR water tank and the pit filter member, so that fragments covered on the surface of the pit filter member are peeled off, the pit filter member is prevented from being blocked, the pressure loss of the pit filter member is reduced, and the normal operation of an injection pump is ensured. The backwash device in the related art is prone to the following problems:
1. with the continuous accumulation of fragments, the containment pit filter is blocked, the pressure loss of the containment pit filter is gradually increased, and when a certain value is reached, the pump cavitation allowance of the pit filter component for taking water is insufficient, so that the normal operation of the containment pit filter pump is jeopardized.
The kinetic energy generated by the height difference between the water in the IVR pool and the pit filtering component is limited by the arrangement space, so that larger pressure cannot be generated, and when the fragments are excessive, backlog of the fragments cannot be flushed out, and the backwashing effect cannot be realized.
Disclosure of Invention
The invention aims to solve the technical problem of providing an improved backwashing device and further providing an improved pit filter.
The technical scheme adopted for solving the technical problems is as follows: constructing a backwash assembly comprising a fluid delivery line and a spray assembly; the fluid delivery line is used for accessing an external cleaning medium; the spray assembly is in communication with the fluid delivery line and is configured to spray a cleaning medium toward the pit filter.
Preferably, the spray assembly comprises a spray tube in communication with the fluid delivery line;
the spray pipe comprises a pipe body and a plurality of groups of spray holes which are arranged on the pipe body and are arranged along the axial direction of the pipe body at intervals.
Preferably, each set of spray holes comprises a plurality of spray holes arranged at intervals along the circumference of the pipe body;
the spray holes are arranged towards the pit filter.
Preferably, the vertical distance between the shower pipe and the pit filter is not more than 400mm.
Preferably, the plurality of spraying pipes are arranged at intervals along the length direction of the fluid conveying pipeline.
Preferably, the pit filter comprises a plurality of groups of filter members spaced apart along the length of the fluid transfer line;
each spray pipe is arranged opposite to the interval between two groups of adjacently arranged filtering components.
Preferably, each set of said filter elements comprises a plurality of layers of said filter elements arranged at intervals;
the spray pipes are arranged between two layers of the filtering components which are adjacently arranged.
Preferably, the back flushing device further comprises a first isolation valve and a second isolation valve which are arranged on the fluid conveying pipeline at intervals;
the spray assembly is disposed between the first isolation valve and the second isolation valve.
Preferably, the shower pipe is integrally formed with the fluid delivery line.
Preferably, the pipe diameter of the fluid conveying pipeline is 80 mm-200 mm;
and/or the pipe diameter of the spray pipe is 20 mm-30 mm.
The back flushing device provided by the invention has the following beneficial effects: the back flushing device is communicated with the spray assembly and the fluid conveying pipeline to spray the cleaning medium, so that the back flushing device can be used for flushing the pit filter, thereby avoiding the pit filter from being blocked by fragments and damaging the normal operation of the containment pit filter pump, and further improving the filtering efficiency of the pit filter.
The invention also provides a pit filter, which comprises a filter body and the back flushing device, wherein a fluid conveying pipeline of the back flushing device is arranged on the filter body.
Preferably, the filter body comprises a bracket, and a plurality of groups of filter members mounted on the bracket;
the fluid delivery pipeline is arranged on the bracket and is detachably connected with the bracket through a connecting structure.
Preferably, the plurality of groups of filter members are spaced apart along the length of the fluid transfer line;
each spray pipe of the back flushing device is arranged opposite to the interval between two groups of adjacently arranged filtering components.
Preferably, each set of said filter elements comprises a plurality of layers of said filter elements arranged at intervals;
and a spray pipe of the back flushing device is arranged between two layers of adjacently arranged filtering components.
Preferably, the connecting structure comprises a pressing piece pressed on the fluid conveying pipeline and fastening components arranged on two opposite sides of the fluid conveying pipeline so as to fixedly connect the pressing piece with the bracket.
The pit filter has the following beneficial effects: the pit filter has the advantages of high filtering efficiency and good filtering effect, and can avoid blockage caused by the generation of fragments due to the use of the back flushing device.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic illustration of a pit filter in accordance with some embodiments of the present invention;
FIG. 2 is an exploded schematic view of the pit filter of FIG. 1;
fig. 3 is a cross-sectional view of a shower pipe of the pit filter shown in fig. 1.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 shows some preferred embodiments of the pit filter of the present invention. The pit filter can be used for filtering water flow carrying slag in a containment reactor, and has the advantages of simple structure, simplicity and convenience in operation and difficulty in blocking.
As shown in fig. 1 and 2, in some embodiments, the pit filter may include a filter body 20 and a backwash device 10; the filter body 20 may be used to filter the flow of water carrying debris in the containment pit. The back flushing device 10 may be disposed on the filter body 20, in some embodiments, the back flushing device 10 may be detachably disposed with the filter body 20, and the back flushing device 10 may be used to flush the filter body 20 of the pit filter, so as to flush the residue attached to the filter body 20, thereby avoiding the blocking of the filter body 20, further ensuring normal operation of the containment pit filter pump, and improving the filtering effect of the pit filter. It will be appreciated that in other embodiments, the backwash assembly 10 may be used to rinse other devices to be cleaned.
Further, in some embodiments, the filter body 20 may include a bracket 21 and multiple sets of filter members 22; the support 21 may be used for multiple sets of filter elements 22. In some embodiments, the bracket 21 has a rectangular parallelepiped shape, and the bracket 21 may be provided with a mounting positioning hole for mounting the filter member 22. The mounting and positioning holes may be distributed on two opposite side walls of the bracket 21, and a plurality of mounting and positioning holes may be disposed on each side wall. In some embodiments, multiple sets of filter members 22 may be provided on each of the oppositely disposed sidewalls of the support 21. Of course, it will be appreciated that in other embodiments, the support 21 is not limited to having multiple sets of filter members 22 disposed on each of the two oppositely disposed sidewalls, and multiple sets of filter members 22 may be disposed on one or more of the sidewalls. In some embodiments, the plurality of sets of filter members 22 may be spaced apart along the length of the support 21. Each set of filter elements may include multiple layers of filter elements 22; the multiple filter members 22 may be disposed at intervals in the height direction of the stand 21. Of course, it will be appreciated that in some embodiments, each set of filter members 22 may also include a layer of filter members 22. In some embodiments, the filter member 22 may be a filter cartridge structure having an opening at one end, the filter cartridge structure may be hexamorph in cross section, and the filter cartridge structure may be formed by winding a filter mesh.
Further, in some embodiments, the backwash device 10 may be disposed on the support 21 and may be detachably connected to the support 21 by providing a connection structure 30. Specifically, in some embodiments, the backwash device 10 may be disposed on the top surface of the support 21. Of course, it will be appreciated that in other embodiments, the backwash assembly 10 may not be limited to being disposed on the top surface of the support 21. Of course, it will be appreciated that in other embodiments, the attachment structure 30 may be omitted and the backwash assembly 10 may be fixedly secured to the support 21 by welding.
Further, in some embodiments, the backwash assembly 10 may include a fluid delivery line 11 and a spray assembly 12. The fluid transfer line 11 may be disposed on the pit filter, and in particular, in some embodiments, the fluid transfer line 11 may be disposed on the stand 21. The spray assembly 12 may be provided on a stand 21, one end of which may be in communication with the fluid delivery line 11, for spraying cleaning medium onto the pit filter, and thereby flushing the pit filter.
Further, in some embodiments, the fluid delivery line 11 may be a circular tube, may be detachably mounted on the top surface of the support 21 through the connection structure 30, and may extend along the length direction of the support 21, one end of the fluid delivery line may be connected to an external water supply device, such as an external water tank, and the other end may be connected to an external water storage device, such as an external water storage tank, where the fluid delivery line 11 may be used to access an external cleaning medium and transmit the external cleaning medium to the spray assembly 12. Of course, it will be appreciated that in some embodiments, the fluid transfer line 11 may also be secured to the top surface of the bracket 21 by welding. In some embodiments, the cleaning medium may be water, although it will be appreciated that in other embodiments, the cleaning medium may not be limited to clear water, and may be a body of water mixed with a detergent. In some embodiments, the fluid transfer line 11 may be a rigid pipe, such as a steel pipe. Of course, it will be appreciated that in other embodiments, the fluid transfer line 11 may not be limited to a rigid conduit, but may be a hose. In some embodiments, the pipe diameter of the fluid transfer line may be 80mm to 200mm, alternatively, in some embodiments, the fluid transfer line may be 100mm.
In some embodiments, the spray assemblies 12 may be two sets, and the two sets of spray assemblies 12 may be disposed on two opposite sides of the fluid delivery line 11 and may be disposed corresponding to the filter members 22 on two opposite sides of the support 21, and the spray assemblies 12 may spray the cleaning medium delivered from the fluid delivery line 11 toward the filter members 22, so as to flush the pit filter and prevent the pit filter from being blocked.
Further, in some embodiments, each set of spray assemblies 12 may include a plurality of spray tubes 121, the plurality of spray tubes 121 may be spaced apart along the length of the fluid transfer line 11, and one end of each spray tube 121 may be connected to the fluid transfer line 11 and may be in communication with the fluid transfer line 11. Of course, it will be appreciated that in other embodiments, each set of spray assemblies 12 may include only one spray tube 121, and is not limited to including a plurality of spray tubes 121. In some embodiments, the shower pipe 121 may be a rigid pipe, such as a steel pipe, although it will be appreciated that in other embodiments, the shower pipe 121 may not be limited to a steel pipe. The shower pipe 121 may be integrally formed with the fluid transfer line 11, and in particular, the shower pipe 121 may be integrally formed with the fluid transfer line 11 by casting or injection molding. Of course, it will be appreciated that in other embodiments, the shower pipe 121 may be removably connected to the fluid delivery line 11. In some embodiments, the pipe diameter of the shower pipe 121 may be 20mm to 30mm, alternatively, the pipe diameter of the shower pipe 121 may be 25mm, which may be determined according to the water pressure of the shower.
In some embodiments, the shower 121 may be disposed opposite to the interval between two sets of the filter members 22 disposed adjacently, and in particular, the shower 121 may be disposed above the interval between the two sets of the filter members 22, may be disposed higher than the filter members 22, and may have equal distances from each filter member 22, so as to facilitate simultaneous flushing of the adjacently disposed filter members 22, and facilitate flushing of the filter members 22 disposed at the lower layer. In some embodiments, the vertical distance between the spray pipe 121 and the filtering member 22 of the pit filter is not greater than 400mm, alternatively, in some embodiments, the vertical distance between the spray pipe 121 and the waiting cleaning device such as the filtering member 22 may be 100 mm-400 mm, so as to ensure that the water sprayed by the spray pipe 121 has a certain pressure, be convenient for taking away the fragments on the filtering member 22, and avoid too high installation, so that the whole pit filter occupies too much space in the containment.
Further, as shown in fig. 3, in some embodiments, the shower pipe 121 can include a pipe body 1211 and a plurality of sets of shower holes 1212. In some embodiments, the tube body 1211 may be a circular tube, the length of which may be disposed parallel to the length of the filter member 22. The plurality of sets of spray holes 1212 may be disposed on the tube body 1211 and may be spaced axially along the tube body 1211 and may be disposed toward, for example, a filter member 22 waiting for a cleaning device to facilitate an all-round cleaning of the filter member 22. In some embodiments, each set of spray holes 1212 may include a plurality of spray holes 1212, which may be spaced apart along the circumference of the tube body 1211, thereby allowing for simultaneous flushing of two sets of adjacently disposed filter members 22 and the underlying filter member 22. In some embodiments, each set of spray holes 1212 may include two spray holes 1212, which may be disposed at a set angle to a midline of the space between the two adjacently disposed sets of filter members 22. The set included angle may be greater than zero and less than 90 degrees.
In some embodiments, the spray pipes 121 may be disposed between two layers of the filtering members 22 disposed adjacently in the height direction of the support 21, so that a plurality of layers of spray pipes 121 may be formed, and the spray pipe 121 disposed at the lower layer may be connected with the spray pipe 121 disposed at the upper layer or with the fluid transfer line 11 by disposing a communication pipe so as to facilitate access to the cleaning medium. By providing the multi-layer shower 121, the multi-layer filter member 22 can be cleaned at the same time, and the cleaning efficiency and cleanliness of the multi-layer filter member 22 can be improved.
Further, in some embodiments, the backwash assembly may further include a first isolation valve and a second isolation valve; the first isolation valve and the second isolation valve may be disposed on the fluid transfer line 11 and may be disposed at intervals. The first isolation valve may be disposed proximate to an end of the fluid transfer line 11 that receives fluid and the second isolation valve may be disposed proximate to an end of the fluid transfer line 11 that outputs fluid. The spray assembly 12 can be disposed between the first isolation valve and the second isolation valve. The first isolation valve is opened to allow external cleaning medium to be connected to the fluid transfer line 11, and the second isolation valve is opened to allow cleaning medium in the fluid transfer line 11 to be discharged.
In some embodiments, the connecting structure 30 may include a pressing piece 31 and a fastening component 32, where the pressing piece 31 may be pressed on the fluid delivery line 11, may be a metal spring, and may have two ends extending onto the bracket 21 along the width direction of the bracket 21. The fastening components 32 may be disposed on opposite sides of the fluid delivery line 11, and may be connected to the compression sheet 31 and the bracket 21 for fixing the fluid delivery line 11 on the bracket 21. In some embodiments, the fastening assembly 32 may include a fastening screw that may be penetrated from the bracket 21 and penetrated from the through hole of the pressing piece 31, and a fastening nut that may be sleeved on an end of the fastening screw penetrated from the pressing piece to be screwed with the fastening screw. Of course, it will be appreciated that in other embodiments, the fastening assembly 32 may not be limited to include a fastening screw and a fastening nut. In some embodiments, the connection structures 30 may be multiple sets, and the multiple sets of connection structures 30 may be spaced apart along the length of the fluid transfer line 11.
The pit filter may be placed in the containment vessel, and when the pit filter is clogged, an external cleaning medium may be introduced into the fluid transfer line 11 by opening the first isolation valve and closing the second isolation valve, and transferred to each spray pipe 121 along the length direction of the fluid transfer line 11, and the cleaning medium may be sprayed toward the filter member 22 through the spray pipes 121 to spray, clean, and thus wash out the debris on the surface of the filter member 22. At the end of the flushing, the first isolation valve may be closed and the second isolation valve opened to drain the cleaning medium from the fluid transfer line 11.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (13)
1. A backwash assembly for flushing a filter body (20) of a pit filter, the filter body (20) comprising a multi-layered filter element (22), characterized by comprising a fluid transfer line (11) and a spray assembly (12); the fluid transfer line (11) is used for accessing an external cleaning medium; the spraying assembly (12) is communicated with the fluid conveying pipeline (11) and is used for spraying the cleaning medium to the pit filter;
-the spray assembly (12) comprises a spray pipe (121) in communication with the fluid delivery line (11); the spray pipes (121) are arranged between two adjacent layers of the filtering members (22), so that a plurality of layers of the spray pipes (121) are formed; the spray pipes (121) are oppositely arranged with intervals between two groups of adjacently arranged filtering members (22); the vertical distance between the spray pipe (121) and the filter member (22) is 100-400 mm.
2. The backwash assembly according to claim 1 wherein the shower pipe (121) comprises a pipe body (1211) and a plurality of sets of shower holes (1212) provided on the pipe body (1211) and spaced apart along the axial direction of the pipe body (1211).
3. The backwash assembly according to claim 2 wherein each set of spray holes (1212) comprises a plurality of spray holes (1212) spaced apart along the circumference of the tube body (1211);
the spray holes (1212) are disposed toward the pit filter.
4. A backwash assembly according to claim 2, characterised in that the vertical distance between the shower pipe (121) and the pit filter is no more than 400mm.
5. The backwash device according to claim 2, wherein the number of shower pipes (121) is plural, and the plural shower pipes (121) are arranged at intervals along the length direction of the fluid transport line (11).
6. The backwash assembly according to claim 1 further comprising first and second isolation valves provided on the fluid transfer line (11) in spaced apart relation;
the spray assembly (12) is disposed between the first isolation valve and the second isolation valve.
7. A backwash assembly according to claim 1, characterised in that the shower pipe (121) is integrally formed with the fluid transfer line (11).
8. The backwash device according to claim 1, wherein,
the pipe diameter of the fluid conveying pipeline (11) is 80-200 mm;
and/or the pipe diameter of the spray pipe (121) is 20 mm-30 mm.
9. A pit filter comprising a filter body (20) and a backflushing device (10) according to any one of claims 1 to 8, the fluid transfer line (11) of the backflushing device (10) being arranged on the filter body (20).
10. Pit filter according to claim 9, wherein the filter body (20) comprises a bracket (21), and a plurality of groups of filter members (22) mounted on the bracket (21);
the fluid delivery pipeline (11) of the back flushing device is arranged on the bracket (21) and is detachably connected with the bracket (21) through a connecting structure (30).
11. Pit filter according to claim 10, wherein the groups of filter elements (22) are arranged at intervals along the length of the fluid transfer line (11);
each spray pipe (121) of the back flushing device is arranged opposite to the interval between two groups of adjacently arranged filtering components (22).
12. Pit filter according to claim 10, wherein each set of the filter elements comprises a plurality of layers of the filter elements (22) arranged at intervals;
and a spray pipe (121) of the back flushing device is arranged between two layers of the filtering components (22) which are adjacently arranged.
13. Pit filter according to claim 10, wherein the connection structure (30) comprises a press plate (31) pressed onto the fluid transfer line (11), fastening members (32) arranged on opposite sides of the fluid transfer line (11) to connect the press plate (31) with the holder (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111231795.3A CN114177687B (en) | 2021-10-22 | 2021-10-22 | Backwash device and pit filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111231795.3A CN114177687B (en) | 2021-10-22 | 2021-10-22 | Backwash device and pit filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114177687A CN114177687A (en) | 2022-03-15 |
| CN114177687B true CN114177687B (en) | 2023-12-26 |
Family
ID=80539572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111231795.3A Active CN114177687B (en) | 2021-10-22 | 2021-10-22 | Backwash device and pit filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114177687B (en) |
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