阅读说明：本技术 一种反冲洗过滤器 (Back flush filter ) 是由 赵坤念 于 2019-11-26 设计创作，主要内容包括：本发明涉及过滤器技术领域,公开了一种反冲洗过滤器,包括罐体,罐体顶部设置电机及减速机,罐体内竖直设置中心管,中心管的上下两端分别连接以中心管的端口为内圈的环形板,环形板的外圈通过法兰盘连接罐体,环形板上围绕中心管以多层的环状形式设置若干通孔,两环形板上的通孔一一对应且对应的两个通孔之间连接一个滤芯,滤芯的上下两端均开口,罐体两侧分别设置进液口和出液口。解决的问题是现有技术中,反冲洗过滤器存在反冲洗死角,造成过滤面积大大减少,需要经常人工清洗滤芯,二次污染大,运行稳定性差,过滤效率低。本发明不会有无法清洗的死角,清洗之后的滤芯过滤面积没有减小,避免了频繁的人工清洗滤芯。(The invention relates to the technical field of filters, and discloses a backwashing filter which comprises a tank body, wherein a motor and a speed reducer are arranged at the top of the tank body, a central pipe is vertically arranged in the tank body, the upper end and the lower end of the central pipe are respectively connected with an annular plate taking a port of the central pipe as an inner ring, the outer ring of the annular plate is connected with the tank body through a flange plate, a plurality of through holes are arranged on the annular plate in a multilayer annular mode around the central pipe, through holes on the two annular plates are in one-to-one correspondence, a filter element is connected between the two corresponding through holes, the upper end and the lower. The problem of solve among the prior art, the back flush filter has the back flush dead angle, causes filter area to reduce greatly, needs often artifical the washing filter core, and secondary pollution is big, and operating stability is poor, and filtration efficiency is low. The invention has no dead angle which can not be cleaned, the filtering area of the filter element after cleaning is not reduced, and frequent manual cleaning of the filter element is avoided.)

1. A backwash filter, characterized in that: the filter element comprises a tank body, wherein a motor and a speed reducer are arranged at the top of the tank body, a central tube is vertically arranged in the tank body, the upper end and the lower end of the central tube are respectively connected with annular plates taking the end port of the central tube as an inner ring, the outer ring of each annular plate is connected with the tank body through a flange, a plurality of through holes are formed in the annular plates in a multilayer annular mode around the central tube, the through holes in the two annular plates are in one-to-one correspondence, a filter element is connected between the two corresponding through holes, the upper end and the lower end of the filter element are both opened, a liquid inlet and a liquid outlet are respectively arranged at two sides of the tank body, the;

a central shaft is vertically arranged in the central pipe, the interior of the central shaft is of a hollow structure, the upper end and the lower end of the central shaft are respectively provided with a cleaning component, the cleaning component comprises a rotating pipe and a plurality of suction nozzles, the suction nozzles are arranged on the rotating pipe and can correspond to the through holes on the annular plate, the through holes in each layer of annular form on the annular plate can at least correspond to one suction nozzle, the upper end of the rotating pipe above the central shaft extends out of the tank body through a transmission shaft and is connected with the speed reducer, the lower end of the rotating pipe below the central shaft is connected with the central shaft, the transmission shaft is sleeved with a sealing device between the speed reducer and the tank body, the upper end of the rotating pipe below the central shaft is connected with the central shaft, the lower end of the rotating pipe below the central shaft extends into the, the jar body is gone up installation pressure differential changer and control box, the pressure differential changer is used for measuring the pressure differential of liquid outlet and inlet and sends for the control box, control box electric connection motor and automatic blowoff valve.

2. The backflush filter of claim 1, wherein: the sealing device comprises a mechanical seal and an O-shaped ring, and the mechanical seal is arranged below the O-shaped ring.

3. The backflush filter of claim 1, wherein: the filter wires of the filter element are vertically arranged.

4. The backflush filter of claim 1, wherein: the suction nozzle is sleeved with a spring.

5. The backflush filter of claim 1, wherein: the cleaning components at two ends of the central shaft are symmetrically arranged.

6. The backflush filter of claim 1, wherein: the cleaning components at two ends of the central shaft are asymmetrically arranged, the central ball is fixedly arranged in the middle of the filter element, and a flow channel is arranged between two sides of the central ball and the inner wall of the filter element.

7. The backflush filter of claim 1, wherein: the upper side and the lower side of the annular plate are symmetrically provided with flange plates, and the edge part of the annular plate extends out of the tank body and is clamped between the flange plates at two sides for fixing.

8. The backflush filter of claim 1, wherein: the filter core lower extreme sets up the filter core flange, the jump ring is cup jointed to filter core upper end periphery.

9. The backflush filter of claim 1, wherein: a steam pipe is introduced into the tank body between the two annular plates, and a steam nozzle is arranged on the steam pipe.

Technical Field

The invention relates to the technical field of filters, in particular to a backwashing filter.

Background

The circulating ammonia water is condensed from a coke oven gas primary cooling system and then sent back to a coke oven gas collecting pipe to spray nitrogen water for cooling the crude gas. The water content of the charging coal and the water generated during coking are sources of the circulating ammonia water.

The oil content of ammonia water is about 350mg/L basically, the suspended matter is 500mg/L, and the main components are coal ash, dust, carbon and tar. High dirt and oil conditions therefore present some challenges to filter selection. How to ensure that the filter can achieve the filtering effect, can solve the problem of automatic cleaning and automatic pollution discharge under the oil-containing working condition, and reduce the operation cost is a great difficulty. At present, the traditional process in China generally adopts a brush type self-cleaning filter or a common back-flushing filter to remove suspended matters in the circulating ammonia water. The brush type self-cleaning filter adopts the combination of the brush and the wedge-shaped filter element, when impurities block the filter element, the motor rotates the brush to mechanically clean the filter element, most of the impurities are blocked in the gap of the filter element or at the rear part of the filter element, the impurities can be stuck on the brush, the brush is difficult to clean, and the cover is opened for cleaning in 1 to 2 days. Frequent cleaning can result in rapid wear of the brush, which often requires replacement, resulting in downtime. And the filtering area of the brush is 3 to 4 times smaller than that of the back washing filter under the condition of the same shell diameter, and the floor area and secondary pollution of the filter are increased.

Although a common backwashing filter adopts a plurality of filter elements, the backwashing effect is poor because only one end of the filter element is filled with water and the diameter of the filter element is large, and the lowest part 1/3 of the filter element can be washed clean by backwashing each time, so that the filtering area is greatly reduced, and the filter needs to be automatically cleaned within 1 hour generally. Because a large number of dead angles which cannot be backwashed exist, the filter element needs to be manually cleaned by opening the cover about half a month. Because the diameter of the filter element is very thick, a large amount of sewage is discharged during cleaning, and secondary pollution is increased. Because the oily sewage is generally in an explosion-proof area and in a flammable and explosive department, the oily sewage is unsmooth in long-term operation, and needs to be manually disassembled and replaced to cause headache of all users, and great hidden danger is brought to safe production. There is an urgent need in the market for a filtration product that operates stably for long periods of time, preferably three to five years without the need for filter element replacement or manual maintenance.

The market lacks a back flush filter for automatic filtration, self-cleaning, the automatic blowdown of aqueous ammonia or other greasy dirt operating mode, can carry out the preliminary treatment with the aqueous ammonia, reduces aqueous ammonia oil content to about 250mg/L, and the suspended solid is within 400mg/L to reduce artifical washing frequently, bring the support for the safety in production.

Disclosure of Invention

In view of the defects of the background art, the invention provides a backwashing filter, and solves the problems that in the prior art, the backwashing filter has backwashing dead angles, so that the filtering area is greatly reduced, a filter element needs to be frequently cleaned manually, the secondary pollution is large, the operation stability is poor, and the filtering efficiency is low.

In order to solve the technical problems, the invention provides the following technical scheme:

a backwashing filter comprises a tank body, wherein a motor and a speed reducer are arranged at the top of the tank body, a central pipe is vertically arranged in the tank body, the upper end and the lower end of the central pipe are respectively connected with an annular plate taking a port of the central pipe as an inner ring, the outer ring of the annular plate is connected with the tank body through a flange plate, a plurality of through holes are arranged on the annular plate in a multilayer annular form around the central pipe, the through holes on the two annular plates are in one-to-one correspondence, a filter element is connected between the two corresponding through holes, the upper end and the lower end of the filter element are both open, a liquid inlet and a liquid outlet are respectively arranged on two sides of the tank body, the liquid inlet is communicated;

a central shaft is vertically arranged in the central pipe, the interior of the central shaft is of a hollow structure, the upper end and the lower end of the central shaft are respectively provided with a cleaning component, the cleaning component comprises a rotating pipe and a plurality of suction nozzles, the suction nozzles are arranged on the rotating pipe and can correspond to the through holes on the annular plate, the through holes in each layer of annular form on the annular plate can at least correspond to one suction nozzle, the upper end of the rotating pipe above the central shaft extends out of the tank body through a transmission shaft and is connected with the speed reducer, the lower end of the rotating pipe below the central shaft is connected with the central shaft, the transmission shaft is sleeved with a sealing device between the speed reducer and the tank body, the upper end of the rotating pipe below the central shaft is connected with the central shaft, the lower end of the rotating pipe below the central shaft extends into the, the jar body is gone up installation pressure differential changer and control box, the pressure differential changer is used for measuring the pressure differential of liquid outlet and inlet and sends for the control box, control box electric connection motor and automatic blowoff valve.

Through the technical scheme, after sewage enters the tank body from the liquid inlet, one part of sewage directly enters the filter element from the lower end of the filter element, the other part of sewage enters the filter element from the central pipe to the cavity above the annular plate above the central pipe and then enters the filter element from the upper end of the filter element, and filtered clean liquid flows out of the liquid outlet; when oil and solid impurity that intercept in the filter core are more and more, the pressure differential of liquid outlet pressure and inlet is bigger and bigger, if pressure transmitter sets up 1Bar, then when liquid outlet and inlet pressure differential reach 1Bar, send the instruction after the pressure differential signal that pressure transmitter sent is received to the control box, begin to wash. The motor is started and the automatic blow-down valve is opened at the same time. The motor drives the rotating pipe to rotate, the suction nozzle is driven to be sequentially aligned with the filter element ports, the reduction ratio is usually larger than 800 or the rotating speed is 1-2 r/m, the suction nozzle stays at each filter element port for a long enough time, when the suction nozzle is aligned with a certain filter element port, the pressure inside the tank body is usually higher than 3 atmospheric pressures due to the pressure difference between the inside and the outside of the tank body, the automatic blow-down valve is communicated with the outside of the tank body, the blow-down pipe is communicated with the automatic blow-down valve, the rotating pipe and the inside of the filter element are 1 atmospheric pressure, therefore, under the pressure difference, clean water inside the tank body and outside the filter element reversely flows, namely flows from the outside of the filter element to the inside of the filter element, oil and solid impurities adhered to the filter element are washed away, and the washed oil and. The rotating pipe rotates for one circle or a plurality of circles to clean the oil and solid impurities in each filter element one by one, so that each filter element is cleaned, then the motor is stopped, and the automatic blow-down valve is closed.

Preferably, sealing device includes mechanical seal and O type circle, and mechanical seal locates the below of O type circle, compares in traditional single Y type circle seal and mechanical seal, and the sealed combination of mechanical seal and O type circle can prolong effective sealing's life-span, and during normal filtration, mechanical seal uses, reaches the limit when mechanical seal life, and sealed department begins to intake, gets into next sealing zone, and O type circle begins to play sealed effect this moment, and general mechanical seal life is 5 years, and O type circle life is more than 5 years to make this sealing device's life more than 10 years.

Preferably, the filter wires of the filter element are vertically arranged, the traditional filter element adopts the filter wires which are transversely arranged, impurities are clamped between the adjacent filter wires to block the filter element, each filter wire provides supporting force and an attachment point for the impurities adhered to each position on the filter wire, and the filter wires are vertically arranged, and the impurities are also clamped between the adjacent filter wires; simultaneously, use same material, filter core that the filter wire is vertical to be arranged, it washes intensity bigger, and the impulsive force that receives between the filter wire is bigger, more is favorable to washing away the impurity between the filter wire, and the effect of back flush is better.

Preferably, the suction nozzle is sleeved with a spring, the suction nozzle is connected with the rotating pipe in a sliding mode, the end face of the suction nozzle is always attached to the annular plate through the spring, after the end face of the suction nozzle is abraded, the suction nozzle can still be attached to the annular plate under the action of the spring, the suction nozzle and the annular plate are attached tightly, and negative pressure suction in the filter element is guaranteed when the suction nozzle works.

Preferably, the diameter of the filter element is 53mm or 38mm, compared with the traditional 150mm filter element, a plurality of filter elements can be arranged in the limited space in the tank body to the maximum extent by adopting the filter elements with the diameters of 53mm and 38mm, and the diameter is smaller, so that the backwashing effect is better improved.

Preferably, the through holes on the annular plate surround the central pipe to form 3 layers of annular structures, namely an inner ring, a middle ring and an outer ring, the rotating pipe is provided with 3 suction nozzles, and the 3 suction nozzles can respectively correspond to the through holes in the inner ring, the through holes in the middle ring and the through holes in the outer ring.

Preferably, the cleaning components at the two ends of the central shaft are symmetrically arranged, and the upper end and the lower end of the central shaft clean one filter element simultaneously. Generally, the filter element is long, when the filter element is communicated with the suction nozzle, negative pressure at the position close to the suction nozzle is large, the negative pressure is smaller and the suction force is smaller when the filter element is far away from the suction nozzle, so that when only one end of the filter element is connected with the suction nozzle for cleaning, 1/3-1/2 filter elements close to the suction nozzle can be well cleaned, and 1/3-1/2 filter elements far away from the suction nozzle are poor in cleaning effect due to insufficient suction force, so that in the subsequent filtering process, the filtering area of the filter element is reduced, and the filtering efficiency is influenced. When two ends of the filter element are communicated with one filter element to clean the same filter element at the same time, two ends of the filter element are close to the suction nozzle, and enough negative pressure suction force penetrates through the whole filter element, so that all parts of the whole filter element are cleaned thoroughly, and cleaning dead angles caused by insufficient suction force are eliminated.

Preferably, the cleaning assemblies at two ends of the central shaft are asymmetrically arranged, the cleaning assemblies at two ends of the central shaft or the angles between the rotating pipes are arranged according to the angle between the two filter elements, so that the cleaning assemblies at two ends can clean two different filter elements in the same ring, a central ball is fixedly arranged in the middle of each filter element, a flow channel is arranged between two sides of the central ball and the inner wall of each filter element, when a suction nozzle in the lower cleaning assembly is aligned with the lower end of one filter element, water in each filter element is sucked into the rotating pipe below to flow, water still enters the upper end of the filter element, when the water entering the upper end flows to the central ball, the flow area is suddenly reduced, the flow speed is suddenly increased, when the flow speed of the water above exceeds the flow speed of the below water, cross flow is formed, impurities adhered to the filter elements are simultaneously subjected to a downward force F1 and an inward force F2 from the top, f1 and F2 are approximately vertical, so that impurities adhered to the wall of the filter element are better washed away; in addition, the arrangement of the central ball approximately shortens the height of the filter element by a half, and in the area from the suction nozzle to the central ball, enough negative pressure suction force is ensured, so that the cleaning effect of the filter element is ensured; in addition, turbulence can be eliminated in such design, and the rivers flow to the disorder is avoided, makes impurity smooth, in the inflow blow off pipe that does not have the delay, avoids impurity to adhere to at the filter silk medial surface.

Preferably, the upper side and the lower side of the annular plate are symmetrically provided with flange plates, the edge part of the annular plate extends out of the tank body and is clamped between the flange plates at the two sides for fixation, and the annular plate is connected with the tank body in a welding mode, so that the welding deformation of the annular plate can be avoided, the flatness of the annular plate is ensured, the suction nozzle is tightly attached to the annular plate, and the back washing effect is facilitated; in addition, due to the design, the annular plate and the filter element can be integrally removed, and the maintenance is convenient.

Preferably, the filter core lower extreme sets up the filter core flange, can prevent that the filter core from down moving, the jump ring is cup jointed to filter core upper end periphery, can prevent that the filter core from upwards moving.

Preferably, between two annular plates the internal steam pipe that lets in of jar, installation steam nozzle on the steam pipe to the intractable fatlute of long-time unable abluent, usable steam is reversed to be swept, improves the practicality.

Compared with the prior art, the invention at least has the following beneficial effects:

1) the filter element is cleaned from the upper end and the lower end simultaneously, so that dead angles which cannot be cleaned are avoided, the filtering area of the cleaned filter element is not reduced, frequent manual cleaning of the filter element is avoided, the operation stability is improved, and secondary pollution and potential safety hazards caused by manual cleaning are eliminated;

2) by utilizing the asymmetric form and the arrangement of the central ball in the filter element, cross flow can be formed by the upper water flow and the lower water flow in the filter element, so that impurities on the filter element can be better cleaned, and the back washing effect is improved;

3) the integral design is mutually matched, the cleaning can be automatically started and stopped, and the cleaning can be carried out while filtering, so that the manual participation is not needed, the labor is saved, and the long-time reliable work of the system is also ensured.

Drawings

The invention has the following drawings:

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of the flange of the present invention;

FIG. 3 is an enlarged view of A in FIG. 1;

FIG. 4 is a schematic view of an annular plate according to the present invention;

FIG. 5 is a schematic view of a cartridge having vertically arranged filter wires according to the present invention;

FIG. 6 is an enlarged view of B in FIG. 5;

FIG. 7 is an enlarged schematic view of C of FIG. 1;

FIG. 8 is a first schematic view of the asymmetric arrangement of the cleaning components at the upper and lower ends;

FIG. 9 is a second schematic view of the asymmetric arrangement of the cleaning components at the upper and lower ends of the cleaning assembly according to the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1-9, a backwash filter comprises a tank body 1, a motor and a speed reducer 2 are arranged at the top of the tank body 1, a central tube 3 is vertically arranged in the tank body 1, the upper end and the lower end of the central tube 3 are respectively connected with an annular plate 4 taking the end of the central tube 3 as an inner ring, the outer ring of the annular plate 4 is connected with the tank body 1 through a flange 5, a plurality of through holes 6 are arranged on the annular plate 4 in 3 layers around the central tube 3 in an annular form (respectively, an inner ring 7, a middle ring 8 and an outer ring 9), the through holes 6 on the two annular plates 4 are in one-to-one correspondence, a filter element 10 is connected between the two corresponding through holes 6, the upper end and the lower end of the filter element 10 are both open, a liquid inlet 11 and a liquid outlet 12 are respectively arranged at two sides of;

a central shaft 13 is vertically arranged in the central tube 3, the inside of the central shaft 13 is of a hollow structure, the upper end and the lower end of the central shaft 13 are respectively provided with a cleaning component 14, the cleaning component 14 comprises a rotating tube 15 and 3 suction nozzles 16, the 3 suction nozzles 16 are arranged on the rotating tube 15 and respectively correspond to through holes 6 on an inner ring 7, a middle ring 8 and an outer ring 9 on the annular plate 4, the upper end of the upper rotating tube 15 extends out of the tank body 1 through a transmission shaft 17 to be connected with a speed reducer 2, the lower end of the upper rotating tube 15 is connected with the central shaft 13, a sealing device is sleeved outside the transmission shaft 17 between the speed reducer 2 and the tank body 1, the upper end of the lower rotating tube 15 is connected with the central shaft 13, the lower end of the lower rotating tube 15 extends into a base 18 and is connected with the base 18 in a rotating manner, a sewage discharge tube 19 is connected with the, the differential pressure transmitter is used for measuring the differential pressure of the liquid inlet 12 and the liquid inlet 11 and sending the differential pressure to the control box, and the control box is electrically connected with the motor and the automatic blowdown valve 20.

Through the technical scheme, after sewage enters the tank body 1 from the liquid inlet 11, one part of sewage directly enters the filter element 10 from the lower end of the filter element 10, the other part of sewage enters the filter element 10 from the central pipe 3 to the cavity above the annular plate 4 above the central pipe and then enters the filter element 10 from the upper end of the filter element 10, and filtered clean liquid flows out from the liquid outlet 12; when oil and solid impurities intercepted in the filter element 10 are more and more, the pressure difference between the liquid outlet 12 and the liquid inlet 11 is larger and larger, if the pressure transmitter is provided with 1Bar, when the pressure difference between the liquid outlet 12 and the liquid inlet 11 reaches 1Bar, the control box sends an instruction after receiving a pressure difference signal sent by the pressure transmitter, and cleaning is started. The motor is started and the automatic blow-down valve 20 is opened. The motor drives the rotating pipe 15 to rotate through the speed reducer 2, the reduction ratio is more than 800 or the rotating speed is 1-2 r/min, so that the suction nozzle 16 stays at each filter cartridge 10 port for a sufficient time to drive the suction nozzle 16 to align with each filter cartridge 10 port in turn, and when the suction nozzle 16 is aligned with a certain filter cartridge 10 port, because the pressure difference exists between the inside and the outside of the tank body 1, the pressure in the tank body 1 is usually more than 3 atmospheric pressures, the automatic blowoff valve 20 is communicated with the outside of the tank body 1, the inside of the drain pipe 19, the rotating pipe 15 and the filter element 10 which are communicated with the automatic drain valve 20 has 1 atmosphere, so that under the pressure difference, the clean water inside the tank body 1 and outside the filter element 10 reversely flows, namely, the oil and the solid impurities adhered to the filter element 10 are washed away by flowing from the outside of the filter element 10 to the inside of the filter element 10, and the washed oil and the washed solid impurities flow out upwards or downwards through the rotating pipe 15, the central shaft 13 and the sewage discharge pipe 19. The rotating pipe 15 rotates one or more times to wash the oil and solid impurities in each filter element 10 one by one, thereby cleaning each filter element 10, and then the motor is stopped, and the automatic drain valve 20 is closed.

Sealing device includes mechanical seal 21 and O type circle, mechanical seal 21 locates the below of O type circle, compare in traditional single Y type circle seal and mechanical seal 21, the sealed combination of mechanical seal 21 and O type circle can prolong effective sealed life-span, when normally filtering, mechanical seal 21 uses, reach the limit when mechanical seal 21 life, sealed department begins to intake, get into next sealing zone, O type circle begins to play sealed effect this moment, general mechanical seal 21 life is 5 years, O type circle life is more than 5 years, thereby make this sealing device's life more than 10 years.

The filter element 10 is a V-shaped filter element 10, the angle of the filter element 10 exceeds 45 degrees, backwashing is facilitated, and the backwashing effect is further improved.

The diameter of the filter element 10 is 53mm or 38mm, compared with the traditional 150mm filter element 10, the filter element 10 adopting 53mm and 38mm can maximally arrange a plurality of filter elements 10 in the limited space in the tank body 1, and the diameter is smaller, thereby being more beneficial to improving the back washing effect.

The filter wires 101 of the filter element 10 are vertically arranged, the traditional filter element 10 adopts the filter wires 101 which are transversely arranged, impurities are clamped between the adjacent filter wires 101 to block the filter element 10, each filter wire 101 provides supporting force and attachment point function for the impurities adhered to each position on the filter wire 101, and the filter wires 101 are vertically arranged, and the impurities are also clamped between the adjacent filter wires 101, but because the filter wires 101 are vertically arranged, the supporting force can not be provided, and only the attachment point function is provided, therefore, the stability of the impurities is relatively poor, and the impurities are more easily separated under the action of water flow impact force during backwashing, therefore, the filter element 10 with the vertically arranged filter wires 101 has better backwashing effect; meanwhile, the same materials are used, the filter element 10 is vertically arranged on the filter wires 101, the washing strength is higher, the impulsive force between the filter wires 101 is higher, impurities among the filter wires 101 can be washed off more conveniently, and the backwashing effect is better.

The suction nozzle 16 is externally sleeved with a spring 30, the suction nozzle 16 is slidably connected with the rotating pipe 15, the spring 30 enables the end face of the suction nozzle 16 to be always attached to the annular plate 4, after the end face of the suction nozzle 16 is abraded, the suction nozzle 16 can still be attached to the annular plate 4 under the action of the spring 30, the suction nozzle 16 and the annular plate 4 are closely attached, and when the suction nozzle 16 works, the negative pressure suction force in the filter element 10 is guaranteed.

The cleaning assemblies 14 at two ends of the central shaft 13 are symmetrically arranged, and the upper end and the lower end of the central shaft simultaneously clean one filter element 10, generally, the filter element 10 is longer, when the filter element 10 is communicated with the suction nozzle 16, the negative pressure at the position close to the suction nozzle 16 is large, the more far away from the suction nozzle 16, the smaller the negative pressure is, the smaller the suction force is, therefore, when only one end of the filter element 10 is connected with the suction nozzle 16 for cleaning, the filter elements 10 1/3-1/2 close to the suction nozzle 16 can be cleaned better, and the 1/3-1/2 far away from the suction nozzle 16 are poor in cleaning effect due to insufficient suction, so that in the subsequent filtering process, the filtering area of the filter element. When two ends of the filter element 10 are communicated with one filter element 10 to clean the same filter element 10 at the same time, the two ends of the filter element 10 are close to the suction nozzle 16, and enough negative pressure suction force penetrates through the whole filter element 10, so that all parts of the whole filter element 10 are thoroughly cleaned, and the cleaning dead angle caused by insufficient suction force is eliminated.

Of course, the cleaning assemblies 14 at the two ends of the central shaft 13 may also be asymmetrically arranged, and the angles between the cleaning assemblies 14 at the two ends of the central shaft 13 or between the rotating pipes 15 are arranged according to the angle between the two filter elements 10, so that the cleaning assemblies 14 at the two ends can clean two different filter elements 10 in the same ring, a central ball 24 is fixedly arranged in the middle of the filter element 10, and a flow channel 26 is arranged between the two sides of the central ball 24 and the inner wall of the filter element 10, as shown in fig. 8 and 9, in fig. 8, the left filter element 10 is a cleaning assembly and is abutted against the lower end of the filter element, the right filter element 10 is a cleaning assembly and is abutted against the upper end of the filter element, when the suction nozzle 16 in the lower cleaning assembly 14 is aligned with the lower end of one filter element 10, the water in the filter element 10 is sucked into the rotating pipe 15 below and flows into the upper end of the filter element, the flow speed is suddenly accelerated, when the flow speed of the water above exceeds that of the water below, cross flow is formed, and the impurities adhered to the filter element 10 are simultaneously subjected to a downward force F1 from top to bottom and an inward and outward force F2, F1 and F2 which are approximately vertical, so that the impurities adhered to the wall of the filter element 10 are better washed away; the same cleaning effect is achieved with the other filter element aligned with the upper cleaning assembly 14. In addition, the central ball 24 is arranged to approximately shorten the height of the filter element 10 by half, and enough negative pressure suction force is ensured in the area from the suction nozzle 16 to the central ball 24, so that the cleaning effect on the filter element 10 is ensured; in addition, the design can eliminate turbulence, avoid the turbulence of the water flow, make impurities flow smoothly and have no retention in the sewage discharge pipe 19, and avoid the impurities from being attached to the inner side surface of the filter wire 101.

The upper side and the lower side of the annular plate 4 are symmetrically provided with the flange plates 5, the edge part of the annular plate 4 extends out of the tank body 1 and is clamped between the flange plates 5 at the two sides for fixing, and the annular plate 4 is connected with the tank body 1 in a welding mode relative to the annular plate 4, so that the welding deformation of the annular plate 4 can be avoided, the suction nozzle 16 is tightly attached to the annular plate 4, and the backwashing effect is facilitated.

The filter core 10 lower extreme sets up the filter core flange, can prevent that filter core 10 from down moving, and the jump ring is cup jointed to filter core 10 upper end periphery, can prevent that filter core 10 from upwards moving.

The steam pipe 22 is led into in the jar body 1 between two annular plates 4, installs steam nozzle 23 on the steam pipe 22, to the intractable fatlute that can't wash for a long time, usable steam is reversed to be swept, improves the practicality.

In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.