CN211536782U - Water filter and self-pressurization self-cleaning device thereof - Google Patents
Water filter and self-pressurization self-cleaning device thereof Download PDFInfo
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- CN211536782U CN211536782U CN201921692694.4U CN201921692694U CN211536782U CN 211536782 U CN211536782 U CN 211536782U CN 201921692694 U CN201921692694 U CN 201921692694U CN 211536782 U CN211536782 U CN 211536782U
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Abstract
The utility model discloses a water filter and a self-pressurizing and self-cleaning device thereof, belonging to the technical field of auxiliary devices of filters, comprising a sewage suction component, a cylindrical shell which comprises the inside of a filter screen, wherein the upper end of the shell is provided with an end cover, the side wall of the shell is provided with a plurality of sewage suction pipes which are communicated with the inside of the shell, and the pipe orifices of the sewage suction pipes are arranged along the radial direction of the filter screen and the side of the filter screen; a sewage discharge valve is arranged at the lower end of the shell, and a sewage suction pipe is communicated with the sewage discharge valve; the high-pressure flushing assembly comprises a back flushing pipe in the clean water cavity, a plurality of back flushing pipe water outlets are formed in the back flushing pipe, the back flushing pipe water outlets are arranged corresponding to the sewage suction pipe, and the back flushing pipe water outlets are arranged towards the side of the filter screen along the radial direction of the filter screen; a high-pressure water pump is arranged outside the water filter, and the backwashing pipe is connected with the high-pressure water pump; the washing motor is arranged on the upper part of the cover body and is respectively connected with the shell and the backwashing pipe through a transmission mechanism. The utility model discloses wash the blowdown ability reinforce, wash regional wide, it is fast to wash, and the water consumption is few, can be applied to the great operating mode of filter screen both sides pressure differential.
Description
Technical Field
The utility model belongs to the technical field of the auxiliary device of filter, especially, relate to a water purifier and self-pressurization self-cleaning device thereof.
Background
Because various impurities exist in raw water, the raw water needs to be filtered by a filter screen before entering a water supply system.
When the existing water filter with the back washing function is used, raw water enters a filter screen of the filter from a water inlet pipe of the filter, then the filter screen is communicated with the filter from the inside to the outside in the filter, impurities larger than meshes are intercepted inside the filter screen by the filter screen, so that a raw water cavity is formed inside the filter screen, a clear water cavity is formed outside the filter screen, and water in the clear water cavity flows out through a water outlet pipe of the water filter; along with various impurities in the raw water cavity are accumulated on the inner wall of the filter screen, the path of water passing through the filter screen is gradually blocked, and the sewage discharge valve of the water filter can be opened to enable the water to flow into the raw water cavity from the clear water cavity for back washing and sewage discharge. When the pressure difference between the two sides of the filter screen is large, particularly when the pressure of the pipe orifice of the water inlet pipe of the water filter is lower than 0.3MPa, impurities on the filter screen cannot be backflushed by the water pressure formed by opening the drain valve, so that the filter screen is often blocked at the moment, and the operation of rear-side water equipment is influenced.
Disclosure of Invention
The utility model is provided for solving the problems existing in the prior art, and aims to provide a water filter and a self-pressurizing and self-cleaning device thereof.
The utility model provides an aspect provides a self-pressurization self-cleaning device, water purifier includes the ware body of lid and lid below, be equipped with the lug on the lid, the level of ware internal portion is equipped with ring shape upper support plate and ring shape bottom suspension fagging, upper support plate and bottom suspension fagging between be equipped with the coaxial cylindrical filter screen of the ware body, the inside former water cavity that is of filter screen, ware side wall, upper support plate, bottom suspension fagging with the synthetic clear water cavity is enclosed to the filter screen, the ware body be equipped with the external portion of intercommunication ware with the inlet tube in former water cavity, the external portion of intercommunication ware with the outlet pipe in clear water cavity the ware bottom intercommunication ware external portion with the blow off pipe in former water cavity, the blow off pipe is equipped with the blowoff valve, the water purifier outside is equipped with central control
The sewage suction assembly is used for sucking impurities on the filter screen and comprises a cylindrical shell inside the filter screen, an end cover is arranged at the upper end of the shell, a plurality of sewage suction pipes communicated with the inside of the shell are arranged on the side wall of the shell, and pipe orifices of the sewage suction pipes are arranged along the radial direction of the shell towards the side of the filter screen; the lower end of the shell is provided with the drain valve, and the sewage suction pipe is communicated with the drain valve; a sewage cavity is arranged in the shell;
the high-pressure washing assembly is used for washing impurities on the filter screen at high pressure, the high-pressure washing assembly comprises a back washing pipe in a clean water cavity, a plurality of back washing pipe water outlets are formed in the back washing pipe, the back washing pipe water outlets are arranged corresponding to the sewage suction pipe, and the back washing pipe water outlets are arranged along the radial direction of the filter screen to the side of the filter screen; a high-pressure water pump is arranged outside the water filter, and the backwashing pipe is connected with the high-pressure water pump;
the washing motor is arranged on the upper part of the cover body and is connected with the filter screen through a transmission mechanism; the central control system is respectively and electrically connected or in communication with the blowdown valve, the high-pressure water pump and the flushing motor.
Drive mechanism includes transmission shaft and connection pad, and the transmission shaft is through first coupling joint washing motor output shaft, the transmission shaft passes through coupling sleeve and connection pad centre bore fastening connection, the coupling sleeve is connected through first footstep bearing the end cover of casing, filter screen upper end fixed connection the connection pad, filter screen lower extreme top meets the backup pad down, follow in the backup pad down the outer circumference of filter screen lower extreme is equipped with several second footstep bearing. And a differential pressure switch is arranged between the outer wall of the device body and the back flushing pipe, is in communication connection with the central control system, and is used for measuring the pressure difference between the water inlet pipe orifice of the water filter and the water outlet pipe orifice of the water filter and transmitting the signal to the central control system to start the self-pressurizing self-cleaning device.
The sewage suction pipe and the water outlet of the backwashing pipe are uniformly arranged along the axial direction of the shell.
The length of the shell and the length of the back washing pipe along the axial direction of the water filter are not less than the height of the filter screen.
The casing lateral wall is last along the radial vertical several scraper blade that is equipped with of casing, the scraper blade with the sewage suction pipe is followed the radial interval of casing sets up, scraper blade excircle week end is equipped with along the radial steel brush that sets up to the filter screen side of casing for the impurity on the filter screen is removed in the brush.
The water filter is characterized in that a high-pressure water pump motor and a drain valve motor are arranged outside the water filter, the high-pressure water pump is connected with the high-pressure water pump motor, and the drain valve is connected with the drain valve motor.
The water filter is characterized in that an upper computer is arranged outside the water filter, the upper computer is respectively electrically connected with the flushing motor, the high-pressure water pump motor and the drain valve motor, and the upper computer is in communication connection with the differential pressure switch.
The utility model discloses another aspect provides a water filter, the water filter include any one of above-mentioned technical scheme self-pressurization self-cleaning device.
In the utility model, when the sewage draining valve is opened, the water pressure inside the water filter is higher than the external atmospheric pressure, the pressure difference enables the sewage suction pipe to generate negative pressure, and the water flow flows from the clear water cavity to the sewage suction pipe; when the high-pressure water pump runs, the backwashing pipe performs high-pressure washing on the filter screen at the outer side of the filter screen; the transmission mechanism drives the filter screen to rotate, the shell and the back washing pipe clean and discharge the filter screen along the circumferential direction, the steel brush on the scraper plate brushes impurities on the filter screen, and the impurities are discharged from the sewage suction pipe; the differential pressure switch can detect the pressure difference between the water inlet pipe orifice of the water filter and the water outlet pipe orifice of the water filter; the functions of setting flushing time, displaying motor state, displaying fault signal, storing alarm record and the like can be realized through the upper computer.
Drawings
Fig. 1 is a schematic structural diagram provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram provided by an embodiment of the present invention;
FIG. 4 is a schematic view of the water flow directions of the raw water chamber, the clear water chamber and the sewage chamber provided by the embodiment of the present invention;
fig. 5 is a schematic diagram provided by an embodiment of the present invention.
Wherein: 1. a water filter; 11. filtering with a screen; 12. a raw water cavity; 13. a clear water cavity; 14. a water inlet pipe; 15. a water outlet pipe; 16. a cover body; 17. a body; 18. lifting lugs; 19. an upper support plate; 110. a lower support plate; 111. a blow-off pipe; 2. a dirt suction assembly; 21. a housing; 22. a sewage suction pipe; 23. a squeegee; 24. a steel brush; 25. an end cap; 26. a sewage chamber; 3. a high pressure flushing assembly; 31. a backwash pipe; 32. a backwash pipe water outlet; 33. a high pressure water pump; 4. washing the motor; 5. a transmission mechanism; 51. a drive shaft; 52. a connecting disc; 53. an output shaft of the washing motor; 54. a first coupling; 55. connecting the shaft sleeve; 56. a first thrust bearing; 57. a second thrust bearing; 58. a flat bond; 59. an upper bearing bush; 6. a high-pressure water pump motor; 7. a motor of the blowoff valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples:
the utility model provides a self-pressurization is from belt cleaning device, water purifier include the ware body 17 of lid 16 and lid 16 below, be equipped with lug 18 on the lid 16, the inside level of ware body 17 is equipped with backup pad 19 and ring shape bottom suspension fagging 110 on the ring shape, go up be equipped with between backup pad 19 and the bottom suspension fagging 110 with the coaxial cylindrical filter screen of ware body 17, the inside former water cavity 12 that is of filter screen, ware body 17 lateral wall, last backup pad 19, bottom suspension fagging 110 and the filter screen encloses synthetic clear water cavity 13, the ware body 17 be equipped with the intercommunication ware body 17 outside with the inlet tube 14 of former water cavity 12, intercommunication ware body 17 outside with the outlet pipe 15 of clear water cavity 13, ware body 17 bottom intercommunication ware body 17 outside with the blow off pipe 111 of former water cavity 12, blow off pipe 111 is equipped with the blowoff valve, the water purifier outside is equipped: the sewage absorbing assembly 2 is used for absorbing impurities on the filter screen, the sewage absorbing assembly 2 comprises a cylindrical shell 21 inside the filter screen, an end cover 25 is arranged at the upper end of the shell 21, a plurality of sewage absorbing pipes 22 communicated with the inside of the shell 21 are welded on the side wall of the shell 21, and pipe openings of the sewage absorbing pipes 22 are arranged along the radial direction of the shell 21 to the side of the filter screen; the lower end of the shell 21 is provided with the blow-down valve, and the sewage suction pipe 22 is communicated with the blow-down valve; a sewage cavity 26 is arranged inside the shell 21; the high-pressure washing component 3 is used for washing impurities on the filter screen at high pressure, the high-pressure washing component 3 comprises a back washing pipe 31 in a clean water cavity 13, a plurality of back washing pipe water outlets 32 are formed in the back washing pipe 31, the back washing pipe water outlets 32 are arranged corresponding to the sewage suction pipe 22, and the back washing pipe water outlets 32 are arranged along the radial direction of the filter screen to the side of the filter screen; a high-pressure water pump 33 is arranged outside the water filter, and the backwashing pipe 31 is connected with the high-pressure water pump 33; the washing motor 4 is arranged on the upper part of the cover body 16, and the washing motor 4 is connected with the filter screen through a transmission mechanism 5; the central control system is respectively electrically or communicatively connected with the blowdown valve, the high pressure water pump 33 and the washing motor 4.
As shown in fig. 1 to 5, when the blowdown valve is opened, the water pressure inside the water filter 1 is higher than the external atmospheric pressure, and the pressure difference causes the sewage suction pipe 22 to generate negative pressure, so that water flows from the clean water chamber 13 to the sewage suction pipe 22, washes off impurities on the filter screen 11, and discharges the water filter 1 through the blowdown valve; when the high-pressure water pump 33 operates, the backwashing pipe 31 performs high-pressure washing on the filter screen 11 at the outer side of the filter screen 11, washes impurities on the filter screen 11 down, and discharges the impurities out of the water filter 1 through the drain valve; the transmission mechanism 5 drives the filter screen 11 to rotate, and the shell 21 and the backwashing pipe 31 clean and discharge the filter screen 11 along the circumferential direction of the filter screen. The design has strong cleaning and pollution discharge capacity and wide cleaning area.
The utility model discloses an embodiment, drive mechanism 5 includes transmission shaft 51 and connection pad 52, and transmission shaft 51 connects washing motor output shaft 53 through first shaft coupling 54, transmission shaft 51 is through connecting axle sleeve 55 and connection pad 52 centre bore fastening connection, connecting axle sleeve 55 connects through first footstep bearing 56 the end cover 25 of casing 21, filter screen upper end fixed connection pad 52, filter screen lower extreme butt bottom suspension fagging 110, follow on the bottom suspension fagging 110 the outer circumference of filter screen lower extreme is equipped with several second footstep bearing 57 for carry on spacingly to the filter screen lower extreme. As shown in figure 1, when the washing motor works, the transmission mechanism drives the filter screen to rotate, and the shell and the backwashing pipe clean and discharge the filter screen along the circumferential direction. Specifically, the output shaft 53 of the washing motor is connected with the first coupling 54 through a flat key 58, and an upper bearing bush 59 is supported between the first coupling 54 and the output shaft 53 of the washing motor.
In one embodiment of the present invention, a differential pressure switch is disposed between the outer wall of the device body 17 and the back-flushing pipe 31, and the differential pressure switch is in communication connection with the central control system for measuring the pressure difference between the pipe orifice of the water inlet pipe 14 of the water filter 1 and the pipe orifice of the water outlet pipe 15 of the water filter 1, and transmitting the signal to the central control system to start the self-pressurization self-cleaning device. The differential pressure switch can detect the pressure difference between the pipe orifice of the water inlet pipe 14 of the water filter 1 and the pipe orifice of the water outlet pipe 15 of the water filter 1, when the pressure difference reaches a preset value, a microswitch in the differential pressure switch is closed, a differential pressure signal is transmitted to a central control system taking the integrated controller of the water filter 1 as a core, the central control system carries out operation processing, and a cleaning program is started to carry out cleaning and sewage disposal. Preferably, the preset value is 0.3 MPa.
It is contemplated that the self-pressurizing self-cleaning apparatus may also be timed by a PLC to automatically control the cleaning and blowdown, may be controlled by a remote terminal to initiate the cleaning and blowdown, and may be manually controlled to initiate the cleaning and blowdown.
In an embodiment of the present invention, as shown in fig. 1 to 4, the sewage suction pipe 22 and the back-washing pipe water outlet 32 are both disposed along the axial direction of the casing 21, the sewage suction pipe 22 can perform uniform sewage suction on the filter screen 11, and the back-washing pipe 31 can perform uniform washing on the filter screen 11, thereby improving the utilization efficiency of the clean water and reducing the water consumption.
In an embodiment of the present invention, as shown in fig. 1, the length of the casing 21 and the back-washing pipe 31 along the axial direction of the water filter 1 is not less than the height of the filter screen 11, so that the washing area of the dirt suction area and the back-washing pipe 31 can cover the whole filter screen 11 when the casing 21 rotates.
The utility model discloses an embodiment, along the radial vertical welding several scraper blade 23 of casing 21 on the casing 21 lateral wall, scraper blade 23 with sewage suction pipe 22 follows the radial interval of casing 21 sets up, scraper blade 23 excircle tip is equipped with the steel brush 24 that sets up along casing 21 radial to the filter screen side, and the impurity on the filter screen is brushed away to steel brush 24 on the scraper blade 23, and impurity is discharged by sewage suction pipe 22.
In an embodiment of the present invention, as shown in fig. 3, the water filter 1 is externally provided with a high pressure water pump motor 6 and a blowoff valve motor 7, the high pressure water pump 33 is connected to the high pressure water pump motor 6, and the blowoff valve is connected to the blowoff valve motor 7.
The utility model discloses an in one embodiment, 1 outside of water purifier is equipped with the host computer, the host computer respectively with washing motor 4, high pressure water pump motor 6 and blowoff valve motor 7 electricity are connected, host computer and differential pressure switch communication connection, the touch-sensitive screen of host computer can realize setting for the flush time, show motor state, show fault signal, save functions such as warning record, wherein fault signal can include the overheated trouble of above-mentioned washing motor 4, high pressure water pump motor 6 and blowoff valve motor 7, the excessive moment trouble of washing motor 4 and blowoff motor, the excessive high trouble of the inside and outside pressure differential of filter screen 11.
A water filter, the water filter 1 comprising the self-pressurizing and self-cleaning device according to any of the above embodiments, the water filter 1 having the advantages of any of the above embodiments, which are not repeated herein.
The working principle is as follows: when the self-pressurized self-cleaning apparatus shown in fig. 5 performs cleaning and sewage disposal, the blow-down valve is opened, the water pressure inside the water filter 1 is higher than the external atmospheric pressure, the pressure difference causes the sewage suction pipe 22 to generate negative pressure, the water flows from the clean water chamber 13 to the sewage suction pipe 22, the high-pressure water pump 33 is operated, the back-flushing pipe 31 performs high-pressure flushing on the filter screen 11 outside the filter screen 11, thus, impurities on the filter screen 11 are flushed down, and the back-flushing water and the impurities are discharged out of the water filter 1 through the blow-down valve. The transmission mechanism 5 drives the filter screen 11 to rotate, the shell 21 and the back washing pipe 31 clean and discharge the filter screen 11 along the circumferential direction, the steel brush 24 on the scraper 23 brushes impurities on the filter screen, and the impurities are discharged from the sewage suction pipe 22. The pressure difference between the inside and the outside of the filter screen 11 can be detected through a differential pressure switch, or the cleaning and sewage draining can be started through the control of a remote terminal, or the self-pressurization self-cleaning device can be started through PLC timing or manually.
When the utility model is used for cleaning and sewage disposal, the water consumption for washing the filter screen 11 only accounts for 0.1-0.5% of the total clean water, and the time for cleaning and sewage disposal is only a few minutes, so that the continuous supply of the clean water with stable water pressure and water quantity of the water using equipment can be ensured.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a self-pressurization is from belt cleaning device, water purifier (1) includes the ware body (17) of lid (16) and lid (16) below, be equipped with lug (18) on lid (16), the inside level of ware body (17) is equipped with ring shape and goes up backup pad (19) and ring shape bottom suspension fagging (110), go up be equipped with between backup pad (19) and the bottom suspension fagging (110) with cylindrical filter screen (11) that ware body (17) is coaxial, filter screen (11) inside is former water cavity (12), ware body (17) lateral wall, go up backup pad (19), bottom suspension fagging (110) and filter screen (11) enclose into clear water cavity (13), ware body (17) be equipped with the outside of intercommunication ware body (17) with inlet tube (14) of former water cavity (12), the outside of intercommunication ware body (17) and outlet pipe (15) of clear water cavity (13), the outside of ware body (17) bottom intercommunication ware body (17) and blow off pipe (111) of former water cavity (12), the sewage discharge pipe (111) is provided with a sewage discharge valve, and a central control system is arranged outside the water filter (1), and the central control system is characterized by comprising
The sewage absorbing assembly (2) is used for absorbing impurities on the filter screen (11), the sewage absorbing assembly (2) comprises a cylindrical shell (21) inside the filter screen (11), an end cover (25) is arranged at the upper end of the shell (21), a plurality of sewage absorbing pipes (22) communicated with the inside of the shell (21) are arranged on the side wall of the shell (21), and pipe orifices of the sewage absorbing pipes (22) are arranged along the shell (21) in the radial direction towards the side of the filter screen (11); the lower end of the shell (21) is provided with the blow-down valve, and the sewage suction pipe (22) is communicated with the blow-down valve; a sewage cavity (26) is arranged inside the shell (21);
the high-pressure washing component (3) is used for washing impurities on the filter screen (11) at high pressure, the high-pressure washing component (3) comprises a back washing pipe (31) in a clear water cavity (13), a plurality of back washing pipe water outlets (32) are formed in the back washing pipe (31), the back washing pipe water outlets (32) are arranged corresponding to the sewage suction pipe (22), and the back washing pipe water outlets (32) are arranged along the filter screen (11) and radially towards the side of the filter screen (11); a high-pressure water pump (33) is arranged outside the water filter (1), and the backwashing pipe (31) is connected with the high-pressure water pump (33);
the washing motor (4), the washing motor (4) is arranged on the upper part of the cover body (16), and the washing motor (4) is connected with the filter screen (11) through a transmission mechanism (5); the central control system is respectively and electrically connected or in communication connection with the blowdown valve, the high-pressure water pump (33) and the washing motor (4).
2. The self-pressurizing self-cleaning apparatus according to claim 1, wherein the transmission mechanism (5) comprises a transmission shaft (51) and a connecting disc (52), the transmission shaft (51) is connected with the output shaft (53) of the washing motor through a first coupling (54), the transmission shaft (51) is fixedly connected with the central hole of the connecting disc (52) through a connecting shaft sleeve (55), the connecting shaft sleeve (55) is connected with the end cover (25) of the housing (21) through a first thrust bearing (56), the upper end of the filter screen (11) is fixedly connected with the connecting disc (52), the lower end of the filter screen (11) abuts against a lower support plate (110), and a plurality of second thrust bearings (57) are arranged on the lower support plate (110) along the outer circumference of the lower end of the filter screen (11).
3. The self-pressurizing and self-cleaning apparatus according to claim 2, wherein a differential pressure switch is provided between the outer wall of the body (17) and the backwash pipe (31), the differential pressure switch being in communication with the central control system for measuring the pressure difference between the inlet (14) and outlet (15) ports of the water filter (1) and transmitting the signal to the central control system for activating the self-pressurizing and self-cleaning apparatus.
4. The self-pressurizing, self-cleaning apparatus according to claim 3, wherein the soil pick-up tube (22) and the backwash tube water outlet (32) are both uniformly positioned axially along the housing (21).
5. The self-pressurizing and self-cleaning apparatus according to claim 4, wherein the length of both the housing (21) and the backwash pipe (31) in the axial direction of the water filter (1) is not less than the height of the screen (11).
6. The self-pressurized and self-cleaning device according to claim 5, wherein a plurality of scrapers (23) are vertically arranged on the side wall of the housing (21) along the radial direction of the housing (21), the scrapers (23) and the sewage suction pipe (22) are arranged at intervals along the radial direction of the housing (21), and the outer circumferential end of each scraper (23) is provided with a steel brush (24) arranged along the radial direction of the housing (21) to the side of the filter screen (11) for brushing away impurities on the filter screen (11).
7. The self-pressurizing and self-cleaning device according to claim 6, wherein a high pressure water pump motor (6) and a blowoff valve motor (7) are provided outside the water filter (1), the high pressure water pump (33) is connected to the high pressure water pump motor (6), and the blowoff valve is connected to the blowoff valve motor (7).
8. The self-pressurizing and self-cleaning device according to claim 7, wherein an upper computer is provided outside the water filter (1), the upper computer is electrically connected with the flushing motor (4), the high-pressure water pump motor (6) and the blowoff valve motor (7), respectively, and the upper computer is in communication connection with the differential pressure switch.
9. A water filter, characterized in that the water filter (1) comprises a self-pressurizing and self-cleaning device according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921692694.4U CN211536782U (en) | 2019-10-11 | 2019-10-11 | Water filter and self-pressurization self-cleaning device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921692694.4U CN211536782U (en) | 2019-10-11 | 2019-10-11 | Water filter and self-pressurization self-cleaning device thereof |
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| CN211536782U true CN211536782U (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921692694.4U Active CN211536782U (en) | 2019-10-11 | 2019-10-11 | Water filter and self-pressurization self-cleaning device thereof |
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| CN (1) | CN211536782U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316522A (en) * | 2020-10-23 | 2021-02-05 | 闫化东 | Sucking type self-cleaning filter |
-
2019
- 2019-10-11 CN CN201921692694.4U patent/CN211536782U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316522A (en) * | 2020-10-23 | 2021-02-05 | 闫化东 | Sucking type self-cleaning filter |
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