CN112892035A - Automatic back-flushing prefilter - Google Patents
Automatic back-flushing prefilter Download PDFInfo
- Publication number
- CN112892035A CN112892035A CN202110053760.9A CN202110053760A CN112892035A CN 112892035 A CN112892035 A CN 112892035A CN 202110053760 A CN202110053760 A CN 202110053760A CN 112892035 A CN112892035 A CN 112892035A
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- China
- Prior art keywords
- filter cartridge
- porous filter
- casing
- cover plate
- water inlet
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- 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
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
本发明公开了一种自动反冲洗预过滤器。壳体内设有多孔滤筒，多孔滤筒上端由设置在上盖板上的挡块压紧，多孔滤筒下端带有外凸缘，外凸缘搁置在壳体内壁的环状支架上；壳体左侧设有进水口，进水阀与进水口相连，上盖板中心设有出水口，下盖板中心设有排污口，排污口与排污阀相连。滤筒上的滤孔设置为锥形小孔，有利于反冲洗时杂物脱落外排。本发明通过压差计自动监测进水侧和出水侧的压力差，监测到压差达到预设值时，自动启动反冲洗，无需人工操作，适用于农村饮用水工程的预过滤环节。
The invention discloses an automatic backwashing pre-filter. The casing is provided with a porous filter cartridge, the upper end of the porous filter cartridge is pressed by a block arranged on the upper cover plate, the lower end of the porous filter cartridge is provided with an outer flange, and the outer flange rests on the annular support on the inner wall of the casing; The left side of the body is provided with a water inlet, the water inlet valve is connected with the water inlet, the center of the upper cover is provided with a water outlet, the center of the lower cover is provided with a sewage outlet, and the sewage outlet is connected with the sewage valve. The filter holes on the filter cartridge are set as small conical holes, which is conducive to the shedding of debris during backwashing. The invention automatically monitors the pressure difference between the water inlet side and the water outlet side through the differential pressure gauge, and automatically starts backwashing when the monitored pressure difference reaches a preset value, without manual operation, and is suitable for the pre-filtering link of rural drinking water projects.
Description
Technical Field
The invention relates to a filter, in particular to an automatic backwashing prefilter suitable for prefiltering rural drinking water.
Background
The drinking water source in rural areas generally takes mountain pond water, lake water, mountain spring water, reservoir water, well water and the like as main materials, the water sources often contain a plurality of large sundries including branches, leaves, small fishes, shrimps and other suspended matters, and the sundries are carried into a drinking water treatment system along with water flow and can affect the normal operation of treatment equipment to a certain extent, so that the treatment equipment needs to be firstly pre-filtered and intercepted before flocculation, sedimentation, filtration and other treatment units. At present, filter screens are adopted for filtration, but in the long-term use process, sundries are accumulated on the filter screens continuously, filter holes are blocked, the filtration efficiency is reduced, the filter is required to be opened for filter screen replacement or manual cleaning, and when sundries are more, for example, fallen leaves in autumn are increased, the filter screens are replaced or the cleaning frequency is increased. This approach is not only inefficient, but also increases labor costs. At present, some filtering devices for automatically cleaning dirt are adopted, but impurities have strong adhesive force in a filter screen, so that the action of mechanical external force is often needed to improve the removal efficiency of the impurities during backwashing, and the operation is complicated.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide an automatic backwashing prefilter to solve the problems that a filter screen is easy to block, manually replaced and cleaned fussy, so that the filter realizes automatic backwashing and is used for a prefiltering link of rural drinking water engineering.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the invention mainly comprises an upper cover plate, a shell and a lower cover plate; the upper end and the lower end of the shell are respectively connected and installed with an upper cover plate and a lower cover plate, a porous filter cylinder is arranged in the shell, the lower end of the porous filter cylinder is provided with an outer flange, the outer flange is placed on an annular support fixed on the inner wall of the shell, the upper end of the porous filter cylinder is pressed by a stop block arranged on the bottom surface of the upper cover plate in a protruding mode, the bottom of the shell is provided with a water inlet, the water inlet is located below the porous filter cylinder; the center of the upper cover plate is provided with a water outlet, the center of the lower cover plate is provided with a sewage draining outlet, and the sewage draining outlet is connected with a sundries collecting device through a sewage draining valve; the shell is externally provided with a differential pressure gauge which is respectively communicated with the inside of the top and the inside of the bottom of the shell.
The differential pressure meter is respectively communicated with the top of the shell above the porous filter cylinder and the bottom below the porous filter cylinder.
The lower side of the porous filter cylinder is provided with an opening, the upper surface and the peripheral side surface of the porous filter cylinder are provided with conical filter holes with uniform sizes, and the inner pore diameter of each conical filter hole is larger than the outer pore diameter.
And spacing spaces are reserved between the upper surface of the porous filter cylinder and the lower side of the upper cover plate and between the side surface of the porous filter cylinder and the inner wall of the shell.
The lower end of the porous filter cylinder is provided with an outer flange, the outer diameter of the outer flange is smaller than the inner diameter of the shell, and a gap is reserved between the outer flange and the shell.
The annular support is welded and fixed on the inner wall of the shell close to the bottom.
The invention has the beneficial effects that:
the filter holes on the filter cylinder are arranged to be small conical holes, the aperture of the water inlet side is larger, the aperture of the water outlet side is smaller, and therefore sundries can fall off and are discharged outwards during backwashing;
the shell of the prefilter is provided with a differential pressure gauge which is used for monitoring the pressure difference between the water inlet side and the water outlet side, and when the pressure difference reaches a preset value, the backwashing is automatically started without manual operation.
The invention is suitable for the pre-filtering treatment link of rural drinking water engineering.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic view of the structure of the porous filter cartridge.
In the figure: 1. the device comprises a water outlet, 2, an upper cover plate, 3, a stop block, 4, a porous filter cylinder, 5, a differential pressure gauge, 6, a shell, 7, an annular bracket, 8, a water inlet valve, 9, a water inlet, 10, a lower cover plate, 11, a sewage discharge outlet, 12, a sewage discharge valve, 13, a conical filter hole, 14 and an outer flange.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the device mainly comprises an upper cover plate 2, a shell 6 and a lower cover plate 10; the upper end and the lower end of the shell 6 are respectively connected with the upper cover plate 2 and the lower cover plate 10, the porous filter cylinder 4 is arranged in the shell 6, and the lower end of the shell 6 is arranged in a conical manner, so that the collection and the discharge of pollutants are facilitated. As shown in fig. 2, the lower end of the porous filter cartridge 4 is provided with an outer flange 14, the outer flange 14 is placed on an annular support 7 fixed on the inner wall of the shell 6, the upper end of the porous filter cartridge 4 is pressed by a stop block 3 arranged on the bottom surface of the upper cover plate 2, a water inlet 9 is arranged at the bottom of the shell 6, the water inlet 9 is positioned below the porous filter cartridge 4, and the water inlet 9 is connected with a drinking water source intake pipe through a water inlet valve 8; the center of the upper cover plate 2 is provided with a water outlet 1, the center of the lower cover plate 10 is provided with a sewage outlet 11, and the sewage outlet 11 is connected with a sundries collecting device through a sewage valve 12; a differential pressure meter 5 is arranged outside the shell 6, and the differential pressure meter 5 is respectively communicated with the inside of the top and the inside of the bottom of the shell 6.
As shown in fig. 1, the differential pressure gauge 5 communicates into the top of the housing 6 above the porous filter cartridge 4 and into the bottom below the porous filter cartridge 4, respectively. So that one end of the two ends of the differential pressure gauge 5 is connected with the water inlet side, and the other end is connected with the water outlet side. The water inlet valve 8, the blow-down valve 12 and the differential pressure meter 5 are all connected to the outside, and the opening degree of the water inlet valve 8 and the blow-down valve 12 is further controlled through an external control system according to the differential pressure value of the differential pressure meter 5.
As shown in fig. 2, the lower side of the porous filter cartridge 4 is open, the upper end is closed, the upper surface and the peripheral side surface of the porous filter cartridge 4 are both provided with conical filter holes 13 with uniform size, the inner pore diameter of the conical filter holes 13 is larger than the outer pore diameter, in the specific implementation, the pore diameter of the water inlet side is 5-10mm, and the pore diameter of the water outlet side is 2-5 mm. The upper surface and the side surface of the porous filter cylinder 4 respectively leave a spacing space with the lower side of the upper cover plate 2 and the inner wall of the shell 6 so as to enlarge the flow area of water flow. The lower end of the porous filter cartridge 4 is provided with an outer flange 14, the outer diameter of the outer flange 14 is slightly smaller than the inner diameter of the shell 6, and a gap is reserved between the outer flange 14 and the shell so that impurities cannot pass through the gap and the filter cartridge is convenient to mount and dismount.
The annular bracket 7 is welded and fixed on the inner wall of the shell 6 close to the bottom, and plays a role in supporting the porous filter cartridge 4 and also plays a certain role in sealing.
The operation of the invention is divided into two steps of a pre-filtering stage and a back-washing stage, wherein the two steps are alternately carried out:
1) a pre-filtering stage: when the blowdown valve 12 is closed and the water inlet valve 8 is opened, the pre-filtration treatment is performed. Raw water enters the filter from a water inlet 9 through a water inlet valve 8, and water flows through the porous filter cartridge 4 from bottom to top and then flows out from a water outlet 1 of the upper cover plate 2. Due to the interception function of the conical filter holes 13 on the filter cartridge, large impurities commonly seen in rural drinking water such as branches, leaves, small fishes, shrimps and the like in raw water are intercepted in the porous filter cartridge 4, and filtrate flows out of the filter through the water outlet 1.
2) A backwashing stage: along with the proceeding of the filtering operation, the sundries trapped in the porous filter cylinder 4 are increased continuously, which leads to the blockage of the filter holes and the reduction of the filtering efficiency, at the moment, the numerical value of the differential pressure gauge 5 with two ends respectively connected with the water inlet side and the water outlet side is increased to a preset differential pressure value, the differential pressure gauge 5 transmits a signal to the control system, the control system closes the water inlet valve 8 and opens the blow-off valve 12, at the moment, the blow-off port 11 forms low pressure, then the residual water on the upper layer of the sand layer in the filter and the water in the water outlet pipeline are directly refluxed, the back washing is automatically carried out, the water flow enters the filter from the water outlet 1, flows through the porous filter cylinder 4 from top to bottom in the direction opposite to the pre-filtered water flow, the sundries are separated from.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110053760.9A CN112892035A (en) | 2021-01-15 | 2021-01-15 | Automatic back-flushing prefilter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110053760.9A CN112892035A (en) | 2021-01-15 | 2021-01-15 | Automatic back-flushing prefilter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112892035A true CN112892035A (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110053760.9A Pending CN112892035A (en) | 2021-01-15 | 2021-01-15 | Automatic back-flushing prefilter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112892035A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115300971A (en) * | 2022-09-29 | 2022-11-08 | 乐比(广州)健康产业有限公司 | Filter device for preparing breath freshener |
| CN116637420A (en) * | 2023-06-02 | 2023-08-25 | 中国重汽集团湖北华威专用汽车有限公司 | Filter with filter core self-cleaning function |
| CN119303364A (en) * | 2024-10-24 | 2025-01-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Tubular filtering device and filtering method using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421261A (en) * | 2002-11-15 | 2003-06-04 | 北京康科环境工程有限公司 | Automation backflush filter |
| KR101169027B1 (en) * | 2012-05-01 | 2012-07-30 | (주)대우건설 | Apparatus and method for compact mobile membrane filtration by circulated pressure and dual pump |
| CN203123656U (en) * | 2013-02-27 | 2013-08-14 | 梅振清 | Automatic reverse-washing filter |
| CN206081820U (en) * | 2016-08-29 | 2017-04-12 | 徐州汉之源果蔬饮品有限公司 | Backflushing filtering device |
-
2021
- 2021-01-15 CN CN202110053760.9A patent/CN112892035A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421261A (en) * | 2002-11-15 | 2003-06-04 | 北京康科环境工程有限公司 | Automation backflush filter |
| KR101169027B1 (en) * | 2012-05-01 | 2012-07-30 | (주)대우건설 | Apparatus and method for compact mobile membrane filtration by circulated pressure and dual pump |
| CN203123656U (en) * | 2013-02-27 | 2013-08-14 | 梅振清 | Automatic reverse-washing filter |
| CN206081820U (en) * | 2016-08-29 | 2017-04-12 | 徐州汉之源果蔬饮品有限公司 | Backflushing filtering device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115300971A (en) * | 2022-09-29 | 2022-11-08 | 乐比(广州)健康产业有限公司 | Filter device for preparing breath freshener |
| CN115300971B (en) * | 2022-09-29 | 2023-01-13 | 乐比(广州)健康产业有限公司 | Filter device for preparing breath freshener |
| CN116637420A (en) * | 2023-06-02 | 2023-08-25 | 中国重汽集团湖北华威专用汽车有限公司 | Filter with filter core self-cleaning function |
| CN119303364A (en) * | 2024-10-24 | 2025-01-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Tubular filtering device and filtering method using the same |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210604 |