CN113509785A

CN113509785A - Back-washing pre-filter

Info

Publication number: CN113509785A
Application number: CN202110853477.4A
Authority: CN
Inventors: 陶孟银
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-10-19

Abstract

The invention discloses a backwash pre-filter, relating to the technical field of liquid filtering devices, and the technical scheme is as follows: comprises a joint, a filter bowl, a filter element and an opening and closing piece, wherein the joint is provided with a water inlet flow passage and a water outlet flow passage; the filter cup is connected with the joint and is provided with a raw water cavity, a partition plate is arranged between the filter cup and the joint, and the partition plate is provided with a central hole which can communicate the water inlet flow channel with the raw water cavity; the connector is internally provided with a guide groove, the guide groove is internally provided with a first conversion hole which can be communicated with the water inlet flow channel, the filter element is arranged in the guide groove in a sliding manner, the filter element is provided with a water purification cavity communicated with the water outlet flow channel, the side wall of the water purification cavity is provided with a second conversion hole which can be communicated with the first conversion hole, and the outer side of the filter element is provided with a flange which can seal the central hole; the bottom of the filter cup is provided with a water outlet hole communicated with the original water cavity, and the opening and closing piece can block or open the water outlet hole. The opening and closing piece is opened, the switching hole II is communicated with the switching hole I, the flange seals the central hole, the backwashing state can be achieved, and the cleaning effect is good.

Description

Back-washing pre-filter

Technical Field

The invention relates to the technical field of liquid filtering devices, in particular to a backwashing prefilter.

Background

The pre-filter is generally arranged behind the water meter and used for filtering visible solid impurities such as rust, silt, algae, colloid and the like in a pipeline and pre-protecting downstream equipment such as a floor heating pipeline, a household faucet, electric appliances and the like.

At present, three pre-filters in the prior art are respectively a forward washing pre-filter, a siphon pre-filter and a back washing pre-filter, wherein the forward washing pre-filter has a large washing flow rate and a good washing effect on large-particle dirt, but the surface of a filter screen is washed only by water flow, and the washing effect is poor on strong attachments adhered to the filter screen; the siphon type pre-filter has a good dirt discharge effect on strong attached dirt on the filter screen, but the dirt suction port must be close to the filter screen, otherwise, the negative pressure suction force is weak, large particles are easy to deposit in a filter bowl of the filter and cannot be discharged, and the cleaning effect is influenced. The backwashing pre-filter utilizes water flow to wash outwards from the inside of the filter screen, has better sewage discharge effect on strong attached dirt on the filter screen, but has smaller water flow during backwashing, and the washing speed of large-particle dirt is not as fast as that of the backwashing pre-filter.

The cleaning effect of the filter screen affects the subsequent filtering effect of the filter screen, so that the cleaning effect of the pre-filter is ensured, and the problem to be solved by technical personnel in the field is urgent.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a backwashing prefilter which has the advantage of good cleaning effect.

The technical purpose of the invention is realized by the following technical scheme: a backwash pre-filter comprises a joint, a filter bowl, a filter element and an opening and closing piece, wherein the joint is provided with a water inlet flow passage and a water outlet flow passage; the filter cup is connected with the joint, the filter cup is provided with a raw water cavity, a partition plate is arranged between the filter cup and the joint, and the partition plate is provided with a central hole which can communicate the water inlet flow passage with the raw water cavity; a guide groove is formed in the connector, a first conversion hole capable of being communicated with the water inlet flow channel is formed in the guide groove, the filter element is arranged in the guide groove in a sliding mode, the filter element is provided with a water purification cavity communicated with the water outlet flow channel, a second conversion hole capable of being communicated with the first conversion hole is formed in the side wall of the water purification cavity, and a flange capable of sealing the central hole is arranged on the outer side of the filter element; the bottom of the filter cup is provided with a water outlet communicated with the raw water cavity, and the opening and closing piece can block or open the water outlet.

Through the technical scheme, in a normal filtering state, the second switching hole is covered by the inner wall of the guide groove, the flange on the filter element is staggered with the partition plate, raw water (to-be-filtered water) enters the raw water cavity through the water inlet flow channel and the central hole, then passes through the filter element to become purified water (filtered water) and is discharged through the water outlet flow channel, and impurities mixed in the raw water are intercepted in the raw water cavity by the filter element; this leading filter is when using longer time or in former water cavity debris when more, open the switching piece, make the water that contains impurity in the former water cavity discharge to the external world through the apopore, meanwhile, the drive filter core removes, make two intercommunication switching holes one of switching hole, and the centre bore is sealed by the flange, be the back flush state this moment, the raw water can only pass through the water inlet runner, switching hole one, switching hole two gets into the water purification intracavity, later the raw water in the water purification intracavity passes the filter core and flows to former water cavity direction, thereby wash into the former water cavity with the outer adnexed debris of filter core, make impurity on former water cavity and the filter core all discharge through the apopore, realize the better purpose of cleaning performance.

Preferably, the prefilter further comprises a driving device, and the driving device can drive the filter element to slide, so that the second switching hole is communicated with the first switching hole, or the second switching hole is covered by the side wall of the guide groove.

Through above-mentioned technical scheme, slide through drive arrangement drive filter core, the user of being convenient for switches the filtration state or the back flush state of this filter, and it is convenient to use.

Preferably, the joint is provided with a first mounting hole communicated with the guide groove, and the filter element is provided with a water outlet for communicating the water purifying cavity with the water outlet flow channel; the driving device comprises a first positioning seat and a screw rod, the first positioning seat is arranged in the first mounting hole, the screw rod is rotatably arranged in the first positioning seat, and the inner end of the screw rod is in threaded connection with the filter element.

Through the technical scheme, the first mounting hole is sealed by the first positioning seat, the filter element can be driven to integrally slide by rotating the screw rod, the filter element is driven, and the filter element can be reset by reversely rotating the screw rod; the purified water in the water purifying cavity can flow into the water outlet flow passage through the water outlet, and the purified water outlet of the filter is realized.

Preferably, the joint is provided with a second mounting hole communicated with the guide groove; the driving device comprises a second positioning seat, a fixed seat, an electromagnetic coil, a connecting rod, a movable iron core and a reset spring, wherein the second positioning seat is arranged in the second mounting hole, the fixed seat is arranged on the joint, the electromagnetic coil is arranged in the fixed seat, the upper end of the connecting rod penetrates through the second positioning seat and is connected with the movable iron core, the lower end of the connecting rod is connected with the filter core, the connecting rod is provided with a connecting hole communicated with the water outlet flow channel, and the reset spring is arranged between the connecting rod and the fixed seat and can push the connecting rod to move.

According to the technical scheme, the electromagnetic coil generates magnetism after being electrified and drives the connecting rod, the movable iron core and the filter element to integrally move, so that the filter element is driven; after the electromagnetic coil is powered off, the pretightening force applied to the connecting rod by the reset spring can push the connecting rod, the movable iron core and the filter element to integrally move and reset.

Preferably, leading filter still includes clean subassembly, clean subassembly includes location box, impeller and rotating turret, the location box set up in former water cavity, set up a plurality of intercommunications on the location box the water conservancy diversion hole in former water cavity is one, the impeller rotate set up in the location box, the rotating turret with the impeller is connected, just the rotating turret is located the filter core outside, be provided with on the rotating turret and wash the washing piece in filter core and/or former water cavity.

According to the technical scheme, the water outlet hole is opened through the opening and closing piece, water flow and impurities in the raw water cavity enter the positioning box through the first flow guide hole and are discharged through the lower end of the positioning box and the water outlet hole; in this in-process, rivers strike the impeller after water conservancy diversion hole one leads for the impeller drives the rotating turret rotation, and the washing piece on the rotating turret then washs filter core or former water cavity along with the rotation of rotating turret, and the rotatory rotating turret drives the rivers rotation in the former water cavity in addition, and then discharge from the apopore with higher speed impurity, and rotatory rivers also can further wash the filter core under the effect of centrifugal force.

Preferably, the lower end of the positioning box is provided with a second diversion hole communicated with the first diversion hole.

Through above-mentioned technical scheme, the cooperation in water conservancy diversion hole one, water conservancy diversion hole two makes the rivers of location box below also can rotate to increase rivers from apopore exhaust efficiency.

Preferably, the lower end of the impeller is provided with a groove, a central column is arranged in the positioning box, and the upper end of the central column is provided with a tip which is in contact with the bottom of the groove.

Through above-mentioned technical scheme, in the center post stretched into the recess, when fixing a position the impeller, can effectively avoid producing the friction between impeller and the location box, the rotation of the impeller of being convenient for.

Preferably, a drain pipe is arranged in the water outlet hole, and the drain pipe is provided with a first drain hole which can communicate the raw water cavity with the outside; the opening and closing piece comprises an extension rod, one end of the extension rod penetrates through the positioning box, the impeller and the rotating frame and is connected with the filter element, and a plug capable of sealing the sewage discharge hole is arranged at the lower end of the extension rod.

Through above-mentioned technical scheme, when drive arrangement drive filter core removed, can drive extension rod synchronous movement, the filter core shifts up promptly, and the end cap opens first blowoff hole, and impurity in the raw water intracavity and raw water then discharge through first blowoff hole.

Preferably, a connecting bolt is arranged in the water outlet hole, and a second sewage discharge hole capable of communicating the raw water cavity with the outside is formed in the connecting bolt; the opening and closing member includes a waste valve connected to the connection bolt.

Through above-mentioned technical scheme, through the break-make of blowoff valve independent control former water cavity and external world, the operation is comparatively simple, and the user of being convenient for uses.

Preferably, a first intercepting net capable of covering the first conversion hole is arranged in the joint.

Through the technical scheme, after the first conversion hole is communicated with the second conversion hole, the channel between the original water cavity and the water inlet channel is separated by the partition plate and the flange, raw water in the water inlet channel can only enter the water purification cavity through the first conversion hole and the second conversion hole, the original water cavity is communicated with the water outlet channel, and the first interception net can effectively prevent impurities in the raw water from entering the water purification cavity through the first conversion hole and the second conversion hole, so that the water purification cavity is guaranteed to be clean all the time.

Preferably, the filter element is provided with a second interception net capable of covering the second conversion hole.

Through above-mentioned technical scheme, the impurity that interception net two can effectively avoid former aquatic gets into the water purification chamber through conversion hole one, conversion hole two.

Preferably, the inner wall of the guide groove is provided with a water inlet groove communicated with the first conversion hole, the periphery of the first conversion hole is provided with a plurality of conversion holes, and the conversion holes can be communicated with the water inlet groove.

Through above-mentioned technical scheme, the intake antrum with change the hole intercommunication, indirectly increased change hole one and intake runner intercommunication area, when the filter core removed to change the hole one and lead to change hole two, partial conversion hole two and intake antrum intercommunication, and then increased the flow that gets into in the water purification intracavity, further increased the clean effect of filter core.

Preferably, the prefilter further comprises a protective shell arranged outside the filter bowl, and the protective shell can surround the filter bowl.

Through above-mentioned technical scheme, the filter bowl parcel is wrapped up to the protecting crust, receives water hammer or freezes the influence and damages, when breaking at the filter bowl, and the water that spills from the impaired department of filter bowl is intercepted by the protecting crust, has avoided influencing resident family's normal life because of this filter loss.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. the filter element is moved to switch the filtering state and the backwashing state, so that the use is convenient;

2. under the pollution discharge state, the discharged water flow can drive the impeller and the rotating frame to synchronously rotate, and the rotating frame drives the water flow in the raw water cavity to rotate, so that the water and impurities in the raw water cavity can be discharged at an accelerated speed, and meanwhile, the inner walls of the filter element and the filter bowl can be cleaned;

3. under the back washing state, the water quantity flowing outwards from the inner side of the water purifying cavity is sufficient, and the back washing effect of the filter element is better;

4. the protective shell can effectively avoid the problem of water leakage caused by burst or damage of the filter cup.

Drawings

FIG. 1 is a schematic external structural view according to a first embodiment;

FIG. 2 is a schematic view of the full cross-section of FIG. 1;

FIG. 3 is a schematic diagram of the exploded structure of FIG. 1;

FIG. 4 is a schematic sectional view of a part of the first embodiment;

FIG. 5 is a schematic structural view of the joint, the filter bowl, and the partition plate after assembly according to the first embodiment;

FIG. 6 is a schematic view of a full-section structure of the joint according to the first embodiment, which is mainly used for showing a first intercepting net;

FIG. 7 is a schematic structural diagram of the framework in the first embodiment, which is mainly used for showing a second intercepting net;

FIG. 8 is another schematic structural diagram of the framework in the first embodiment, which is mainly used for showing a second intercepting net;

FIG. 9 is a schematic structural view of a cleaning assembly in an embodiment;

FIG. 10 is a schematic view of a filter configuration in full section (the direction of the arrows indicates the direction of flow of the flowing water) according to an embodiment;

FIG. 11 is a schematic view of a full-section of a backwash state according to an embodiment;

FIG. 12 is a schematic view of the second embodiment in full section;

FIG. 13 is a schematic partial cross-sectional view of FIG. 12;

FIG. 14 is a schematic view of the third embodiment in full section;

FIG. 15 is a schematic view of a partial explosion structure in the third embodiment;

FIG. 16 is a schematic view of the full-section structure of the fourth embodiment.

Reference numerals: 100. a joint; 110. a water inlet flow channel; 120. a water outlet flow channel; 130. a guide groove; 131. a first conversion hole; 132. a water inlet groove; 140. a first mounting hole; 141. a shoulder block; 142. a chute; 150. a second mounting hole; 160. intercepting a first net;

200. a filter bowl; 210. a raw water cavity; 220. a water outlet hole; 221. a blow-off pipe; 2211. a first sewage draining hole; 222. a connecting bolt; 2221. a second sewage draining hole;

300. a filter element; 310. a framework; 311. a water purifying cavity; 312. a second conversion hole; 313. a flange; 314. a water outlet; 315. a second interception net; 316. a slider; 320. filtering with a screen; 330. a connecting member;

400. an opening and closing member; 410. an extension pole; 411. a plug; 412. a rubber sleeve; 420. a blowoff valve;

500. a partition plate; 510. a central bore;

600. a drive device; 610. a first positioning seat; 620. a screw rod; 621. a hand wheel; 630. a second positioning seat; 640. a fixed seat; 650. an electromagnetic coil; 660. a connecting rod; 661. connecting holes; 670. a movable iron core; 680. a return spring;

700. a cleaning assembly; 710. a positioning box; 711. a first diversion hole; 712. a second diversion hole; 713. a central column; 7131. a tip; 714. a support ring; 720. an impeller; 721. a groove; 7211. a reinforcement cap; 730. a rotating frame; 731. cleaning the workpiece; 7311. a first brush; 7312. a second brush;

800. and (4) a protective shell.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

a backwash pre-filter, as shown in fig. 1 to 11, comprising a connector 100, a filter bowl 200, a filter element 300 and a closure 400, wherein the connector 100 has a water inlet passage 110 and a water outlet passage 120;

the filter cup 200 is connected with the joint 100, the filter cup 200 is provided with a raw water cavity 210, a partition plate 500 is arranged between the filter cup 200 and the joint 100, and the partition plate 500 is provided with a central hole 510 which can communicate the water inlet flow passage 110 with the raw water cavity 210;

a guide groove 130 is formed in the joint 100, and a first conversion hole 131 capable of being communicated with the water inlet channel 110 is formed in the guide groove 130;

the filter element 300 can be a common filter element 300 in the prior art, and generally comprises a framework 310 and a filter screen 320 arranged on the framework 310, wherein the upper end of the framework 310 is arranged in the guide groove 130 in a sliding manner, a water purification cavity 311 communicated with the water outlet flow channel 120 is arranged in the framework 310, a conversion hole II 312 capable of being communicated with the conversion hole I131 is arranged on the side wall of the water purification cavity 311, a flange 313 capable of sealing the central hole 510 is arranged on the outer side of the framework 310, and as other schemes, the flange 313 can be clamped or connected to the outer side of the framework 310 in a threaded manner;

the bottom of the filter bowl 200 is provided with a water outlet 220 communicated with the raw water cavity 210, and the opening and closing member 400 can block or open the water outlet 220.

The prefilter further comprises a driving device 600, wherein the driving device 600 can drive the filter element 300 to slide, so that the second switching hole 312 is communicated with the first switching hole 131, or the second switching hole 312 is covered by the side wall of the guide groove 130.

Further, the framework 310 is provided with a water outlet 314 for communicating the purified water cavity 311 with the water outlet channel 120, the filter element 300 further comprises a connecting piece 330, the connecting piece 330 can be integrally formed with or detachably connected with the framework 310, and in order to ensure the purified water discharge efficiency, the framework 310 and/or the connecting piece 330 can be provided with a plurality of water outlets 314; the joint 100 is provided with a first mounting hole 140 communicated with the guide groove 130, the driving device 600 includes a first positioning seat 610 and a screw 620, the first positioning seat 610 is disposed in the first mounting hole 140 and seals the first mounting hole 140, the screw 620 is rotatably disposed in the first positioning seat 610, and the inner end of the screw 620 is in threaded connection with the connecting member 330. In order to increase the comfort of the user, a hand wheel 621 can be connected to the outer end of the screw 620.

As shown in fig. 3 and 6, a retaining shoulder 141 is provided between the first mounting hole 140 and the guide groove 130, the retaining shoulder 141 can axially limit the framework 310, a sliding groove 142 is provided on the retaining shoulder 141, a sliding block 316 is provided at the upper end of the framework 310, and the sliding block 316 can slide in the sliding groove 142.

The pre-filter further comprises a cleaning assembly 700, the cleaning assembly 700 comprises a positioning box 710, an impeller 720 and a rotating frame 730, the positioning box 710 is arranged in the raw water cavity 210, the positioning box 710 is provided with a plurality of first flow guide holes 711 communicated with the raw water cavity 210, the impeller 720 is rotatably arranged in the positioning box 710, a support ring 714 for reducing friction is arranged between the impeller 720 and the positioning box 710, as other schemes, the support ring 714 can be replaced by a plane bearing, the rotating frame 730 is connected with the impeller 720, the rotating frame 730 is arranged outside the filter element 300, the rotating frame 730 is provided with a cleaning piece 731 capable of cleaning the filter element 300 and/or the raw water cavity 210, the cleaning piece 731 can be a first brush 7311 and a second brush 7312 arranged on the rotating frame 730, bristles of the first brush 7311 are in contact with the outer wall of the filter screen 320, and bristles of the second brush 7312 are in contact with the side wall of the raw water cavity 210. In this embodiment, the first brush 7311 may be replaced with a first rubber blade attached to the outer wall of the filter screen 320, and the second brush 7312 may be replaced with a second rubber blade attached to the wall of the raw water chamber 210.

The first diversion hole 711 is obliquely arranged, and the oblique direction of the first diversion hole 711 can be the same as the turning deviation force of the use area, for example, the turning deviation force of the northern hemisphere is rightward, and the first diversion hole 711 faces the right side.

Further, the lower end of the positioning box 710 is provided with a second diversion hole 712 communicated with the first diversion hole 711, and the second diversion hole 712 is matched with the first diversion hole 711, that is, the second diversion hole 712 and the first diversion hole 711 incline to the same side. Of course, the second guiding hole 712 may be a common through hole.

Preferably, a drain pipe 221 is arranged in the water outlet hole 220, and the drain pipe 221 is provided with a first drain hole 2211 which can communicate the raw water cavity 210 with the outside; the opening and closing member 400 includes an extension rod 410, one end of the extension rod 410 penetrates through the positioning box 710, the impeller 720 and the rotating frame 730 and is connected with the filter element 300, and the lower end of the extension rod 410 is provided with a plug 411 capable of sealing the first blowdown hole 2211; in order to increase the sealing performance of the plug 411, a rubber sleeve 412 can be sleeved outside the plug 411, and the outer ring of the rubber sleeve 412 can seal the first sewage discharge hole 2211.

As shown in fig. 6 to 8, it is preferable that a first intercepting net 160 capable of covering the first switching hole 131 is provided in the joint 100. As another scheme, the inner wall or the outer wall of the framework 310 is provided with a second interception net 315 capable of covering the second conversion hole 312, and the first interception net 160 and the second interception net 315 can be alternatively arranged, and can also be completely additionally arranged to ensure the cleanness of the water purification cavity 311. The inner wall of the guide groove 130 is provided with a water inlet groove 132 communicated with the first conversion hole 131, the second conversion hole 312 is circumferentially provided with a plurality of conversion holes, and the second conversion holes 312 can be communicated with the water inlet groove 132.

As shown in fig. 10, the prefilter further includes a protective shell 800 disposed outside the filter bowl 200, and the filter bowl 200 can be surrounded by the protective shell 800, and the protective shell 800 can be integrally formed with the filter bowl 200, or can be directly connected to the connector 100, as long as the filter bowl 200 is accommodated in the protective shell 800.

The working principle of the backwashing prefilter is as follows:

under the normal filtering state, the second switching hole 312 is covered by the inner wall of the guiding groove 130, and the flange 313 on the filter element 300 is dislocated with the partition plate 500, and the plug 411 seals the first drain hole 2211.

Raw water (to-be-filtered water) enters the raw water cavity 210 through the water inlet flow passage 110 and the central hole 510, then passes through the filter element 300 to become purified water (filtered water) and is discharged through the water outlet 314 and the water outlet flow passage 120, and impurities in the raw water are intercepted in the raw water cavity 210 by the filter element 300, so that the filtration of the pre-filter is realized.

When the pre-filter is used for a long time or sundries are accumulated in the raw water cavity 210, the hand wheel 621 is rotated, so that the hand wheel 621 drives the screw rod 620 to rotate, the filter element 300 and the plug 411 are driven to integrally move upwards, finally the plug 411 opens the first pollution discharge hole 2211, the flange 313 seals the central hole 510, the second conversion hole 312 is communicated with the first conversion hole 131 and the water inlet groove 132, and the back washing state is realized at the moment;

the water and the impurities in the raw water cavity 210 are discharged to the outside through the first pollution discharge hole 2211, the raw water in the water inlet flow channel 110 passes through the first interception net 160 or the second interception net 315 and then flows into the purified water cavity 311 through the first conversion hole 131, the water inlet tank 132 and the second conversion hole 312, the large-flow water flows out from the purified water cavity 311 to the raw water cavity 210, and the impurities adsorbed on the filter screen 320 are flushed into the raw water cavity 210; meanwhile, the water flow in the raw water cavity 210 is guided by the first guiding hole 711 and then impacts the impeller 720, and is discharged out of the positioning box 710 through the second guiding hole 712, so that the impeller 720 and the rotating rack 730 integrally rotate, the cleaning piece 731 on the rotating rack 730 cleans the outer wall of the filter element 300 and the inner wall of the raw water cavity 210 along with the rotation of the rotating rack 730, and the rotating rack 730 drives the water flow in the raw water cavity 210 to rotate in the direction of the rotating deviation force, so that the rotating water flow cleans the raw water cavity 210 and the filter element 300 and accelerates the discharge of the water mixed with impurities from the first drain hole 2211.

After the filter element 300 is cleaned, the hand wheel 621 is rotated reversely, so that the filter element 300 and the plug 411 are integrally moved downwards and reset, finally, the plug 411 seals the first pollution discharge hole 2211, the flange 313 on the filter element 300 is staggered with the partition plate 500, the second conversion hole 312 is covered by the inner wall of the guide groove 130, and the pre-filter enters a normal filtering state.

Example two:

the difference between the second embodiment and the first embodiment is that: as shown in fig. 12 to 13, the joint 100 is provided with a second mounting hole 150 communicating with the guide groove 130; drive arrangement 600 includes two positioning seats 630, fixing base 640, solenoid 650, connecting rod 660, movable iron core 670 and reset spring 680, two 630 positioning seats set up in two 150 of mounting hole, fixing base 640 sets up on joint 100, solenoid 650 sets up in fixing base 640, two 630 positioning seats are run through to the upper end of connecting rod 660 and are connected with movable iron core 670, the lower extreme and the skeleton 310 of connecting rod 660 are connected, and set up the connecting hole 661 that communicates out water runner 120 on the connecting rod 660, reset spring 680 sets up between connecting rod 660 and fixing base 640, and can promote connecting rod 660 and remove.

The working principle is as follows:

the electromagnetic coil 650 is energized, the energized electromagnetic coil 650 generates magnetic force and drives the movable iron core 670 to move upwards, so that the connecting rod 660, the filter element 300 and the plug 411 integrally move upwards, and the return spring 680 is compressed in the fixed seat 640 by the connecting rod 660 to complete the upward movement of the filter element 300;

the electromagnetic coil 650 is powered off, the movable iron core 670 loses magnetic control, the pre-tightening force applied to the connecting rod 660 by the return spring 680 pushes the connecting rod 660, the movable iron core 670, the filter element 300 and the plug 411 to be reset integrally, and the reset action of the filter element 300 is completed.

Example three:

the difference between the third embodiment and the first embodiment is that: as shown in fig. 14 to 15, a groove 721 is formed at the lower end of the impeller 720, a central column 713 is disposed in the positioning box 710, and a tip 7131 contacting the bottom of the groove 721 is disposed at the upper end of the central column 713.

Further, to reduce wear of the central post 713 and the slots 721, reinforcement caps 7211 are disposed within the slots 721, the central post 713 can be inserted into the reinforcement caps 7211, and the prongs 7131 contact the interior of the reinforcement caps 7211.

Example four:

the difference between the fourth embodiment and the first embodiment is that: as shown in fig. 16, a connection bolt 222 is disposed in the water outlet hole 220, and a second sewage discharge hole 2221 capable of connecting the raw water chamber 210 to the outside is disposed in the connection bolt 222; the closure 400 includes a waste valve 420 connected to the connection bolt 222, and the waste valve 420 may be a ball valve as is well known in the art.

The working principle is as follows:

in the filtering state, the second switching hole 312 is covered by the inner wall of the guide groove 130, and the flange 313 of the filter element 300 is misaligned with the partition plate 500, so that the second blowoff hole 2221 is sealed by the blowoff valve 420. Raw water enters the raw water cavity 210 through the water inlet flow passage 110 and the central hole 510, then passes through the filter element 300 to become purified water, and is discharged through the water outlet 314 and the water outlet flow passage 120, and impurities in the raw water are intercepted in the raw water cavity 210 by the filter element 300, so that the filtration of the pre-filter is realized.

When the backwashing state needs to be switched, the blowdown valve 420 is opened, the raw water cavity 210 is communicated with the outside through the second blowdown hole 2221, the hand wheel 621 is rotated, the hand wheel 621 drives the screw rod 620 to rotate, the filter element 300 is driven to move upwards, finally, the central hole 510 is sealed through the flange 313, and the second conversion hole 312 is communicated with the first conversion hole 131 and the water inlet groove 132;

the water and the impurities in the raw water cavity 210 are discharged to the outside through the second blowdown hole 2221, the raw water in the water inlet channel 110 passes through the first interception net 160 or the second interception net 315 and then flows into the purified water cavity 311 through the first conversion hole 131, the water inlet tank 132 and the second conversion hole 312, the large-flow water flows out from the purified water cavity 311 to the raw water cavity 210, and the impurities adsorbed on the filter screen 320 are flushed into the raw water cavity 210; meanwhile, the water flow in the raw water chamber 210 is guided by the first guide hole 711 and then impacts the impeller 720, and is discharged out of the positioning box 710 through the second guide hole 712, so that the impeller 720 and the rotating frame 730 integrally rotate, the cleaning piece 731 on the rotating frame 730 cleans the outer wall of the filter element 300 and the inner wall of the raw water chamber 210 along with the rotation of the rotating frame 730, and the rotating frame 730 drives the water flow in the raw water chamber 210 to rotate in the direction of the rotating bias force, so that the rotating water flow cleans the raw water chamber 210 and the filter element 300 and accelerates the discharge of the water mixed with impurities from the second drain hole 2221.

After the filter element 300 is cleaned, the blow-down valve 420 and the hand wheel 621 are turned back to move the filter element 300 downwards and reset, finally the blow-down valve 420 seals the second blow-down hole 2221, the flange 313 and the partition plate 500 are staggered, the second conversion hole 312 is covered by the inner wall of the guide groove 130, and the pre-filter enters a filtering state.

The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.

Claims

1. A back flush pre-filter, which is characterized in that: the pre-filter comprises a connector (100), a filter bowl (200), a filter element (300) and a closing piece (400), wherein the connector (100) is provided with a water inlet flow passage (110) and a water outlet flow passage (120); the filter cup (200) is connected with the joint (100), the filter cup (200) is provided with a raw water cavity (210), a partition plate (500) is arranged between the filter cup (200) and the joint (100), and the partition plate (500) is provided with a central hole (510) which can communicate the water inlet flow passage (110) with the raw water cavity (210); a guide groove (130) is formed in the connector (100), a first conversion hole (131) capable of being communicated with the water inlet flow channel (110) is formed in the guide groove (130), the filter element (300) is arranged in the guide groove (130) in a sliding mode, the filter element (300) is provided with a water purification cavity (311) communicated with the water outlet flow channel (120), a second conversion hole (312) capable of being communicated with the first conversion hole (131) is formed in the side wall of the water purification cavity (311), and a flange (313) capable of sealing the central hole (510) is arranged on the outer side of the filter element (300); the bottom of the filter cup (200) is provided with a water outlet hole (220) communicated with the raw water cavity (210), and the opening and closing piece (400) can block or open the water outlet hole (220).

2. The backwash pre-filter as set forth in claim 1, wherein: the prefilter further comprises a driving device (600), wherein the driving device (600) can drive the filter element (300) to slide, so that the second switching hole (312) is communicated with the first switching hole (131), or the second switching hole (312) is covered by the side wall of the guide groove (130).

3. The backwash pre-filter as set forth in claim 2, wherein: the joint (100) is provided with a first mounting hole (140) communicated with the guide groove (130), and the filter element (300) is provided with a water outlet (314) communicated with the water purifying cavity (311) and the water outlet flow channel (120); the driving device (600) comprises a first positioning seat (610) and a screw rod (620), the first positioning seat (610) is arranged in the first mounting hole (140), the screw rod (620) is rotatably arranged in the first positioning seat (610), and the inner end of the screw rod (620) is in threaded connection with the filter element (300).

4. The backwash pre-filter as set forth in claim 2, wherein: a second mounting hole (150) communicated with the guide groove (130) is formed in the joint (100); drive arrangement (600) includes positioning seat two (630), fixing base (640), solenoid (650), connecting rod (660), moves iron core (670) and reset spring (680), positioning seat two (630) set up in mounting hole two (150), fixing base (640) set up in connect (100) on, solenoid (650) set up in fixing base (640), the upper end of connecting rod (660) is run through positioning seat two (630) and with move iron core (670) and connect, the lower extreme of connecting rod (660) with filter core (300) are connected, just seted up the intercommunication on connecting rod (660) go out the connecting hole (661) of water runner (120), reset spring (680) set up in connecting rod (660) with between fixing base (640), and can promote connecting rod (660) remove.

5. The backwash pre-filter as set forth in any one of claims 2 to 4, wherein: leading filter still includes clean subassembly (700), clean subassembly (700) are including location box (710), impeller (720) and rotating turret (730), location box (710) set up in former water cavity (210), set up a plurality of intercommunications on location box (710) the water conservancy diversion hole (711) of former water cavity (210), impeller (720) rotate set up in location box (710), rotating turret (730) with impeller (720) are connected, just rotating turret (730) are located the filter core (300) outside, be provided with on rotating turret (730) and wash washing piece (731) of filter core (300) and/or former water cavity (210).

6. The backwash pre-filter as set forth in claim 5, wherein: the lower end of the positioning box (710) is provided with a second diversion hole (712) communicated with the first diversion hole (711).

7. The backwash pre-filter as set forth in claim 5, wherein: the lower end of the impeller (720) is provided with a groove (721), a central column (713) is arranged in the positioning box (710), and the upper end of the central column (713) is provided with a sharp head (7131) which is in contact with the bottom of the groove (721).

8. The backwash pre-filter as set forth in claim 5, wherein: a sewage discharge pipe (221) is arranged in the water outlet hole (220), and the sewage discharge pipe (221) is provided with a first sewage discharge hole (2211) which can communicate the raw water cavity (210) with the outside; the opening and closing piece (400) comprises an extension rod (410), one end of the extension rod (410) penetrates through the positioning box (710), the impeller (720) and the rotating frame (730) and is connected with the filter element (300), and a plug (411) capable of sealing the first sewage discharge hole (2211) is arranged at the lower end of the extension rod (410).

9. The backwash pre-filter as set forth in claim 5, wherein: a connecting bolt (222) is arranged in the water outlet hole (220), and a second sewage discharge hole (2221) which can connect the raw water cavity (210) with the outside is formed in the connecting bolt (222); the opening and closing member (400) includes a soil discharge valve (420) connected to the connection bolt (222).

10. The backwash pre-filter as set forth in any one of claims 1 to 4, wherein: a first intercepting net (160) capable of covering the first conversion hole (131) is arranged in the joint (100).

11. The backwash pre-filter as set forth in any one of claims 1 to 4, wherein: and a second interception net (315) capable of covering the second conversion hole (312) is arranged on the filter element (300).

12. The backwash pre-filter as set forth in any one of claims 1 to 4, wherein: the inner wall of the guide groove (130) is provided with a water inlet groove (132) communicated with the first conversion hole (131), the second conversion hole (312) is circumferentially provided with a plurality of conversion holes, and the second conversion holes (312) can be communicated with the water inlet groove (132).

13. The backwash pre-filter as set forth in any one of claims 1 to 4, wherein: the pre-filter further comprises a protective shell (800) arranged on the outer side of the filter bowl (200), and the protective shell (800) can surround the filter bowl (200).