A backwash pre-filter

Abstract

The invention discloses a backwash pre-filter, which relates to the technical field of liquid filtering devices. The technical scheme thereof mainly includes: a joint, a filter cup, a filter element and an opening and closing member, wherein the joint has a water inlet channel and a water outlet channel; the filter cup is connected to the joint and has a raw water cavity, a partition is arranged between the filter cup and the joint, and the partition has a central hole that can connect the water inlet channel with the raw water cavity; a guide groove is arranged in the joint, a conversion hole 1 that can connect the water inlet channel is arranged in the guide groove, the filter element is slidably arranged in the guide groove, the filter element has a clean water cavity that connects the water outlet channel, a conversion hole 2 that can connect the conversion hole 1 is arranged on the side wall of the clean water cavity, and a flange that can seal the central hole is arranged on the outer side of the filter element; a water outlet hole that connects the raw water cavity is arranged at the bottom of the filter cup, and the opening and closing member can block or open the water outlet hole. When the opening and closing member is opened, and the conversion hole 2 is connected to the conversion hole 1, and the flange seals the central hole, the backwash state can be entered, and the cleaning effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of liquid filtering devices, in particular to a backwashing pre-filter. Background Art

[0002] The pre-filter is generally installed behind the water meter to filter out visible solid impurities such as rust, silt, algae, colloids, etc. in the pipes, and plays a pre-protective role for downstream equipment such as floor heating pipes, household faucets, and electrical appliances.

[0003] At present, there are three types of pre-filters in the prior art, namely, forward flushing pre-filter, siphon pre-filter and backwashing pre-filter. Among them, the forward flushing pre-filter has a large flushing flow rate and a good flushing effect for large particles of dirt, but it only relies on water flow to flush the filter surface, and the cleaning effect is poor for the strongly attached attachments on the filter. The siphon pre-filter has a better sewage discharge effect for the strongly attached dirt on the filter, but the suction port must be very close to the filter, otherwise the negative pressure suction is weak, and large particles are easily deposited in the filter cup and cannot be discharged, affecting the cleaning effect. The backwashing pre-filter uses water flow to flush from the inside of the filter to the outside. It has a better sewage discharge effect for the strongly attached dirt on the filter, but the water flow is small during backwashing, and the flushing speed for large particles of dirt is not as good as the forward flushing pre-filter.

[0004] The cleaning effect of the filter screen affects the subsequent filtering effect of the filter screen. Therefore, ensuring the cleaning effect of the pre-filter is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In view of the shortcomings of the prior art, an object of the present invention is to provide a backwash pre-filter, which has the advantage of better cleaning effect.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a backwash pre-filter, the pre-filter comprising a joint, a filter cup, a filter element, an opening and closing member, a driving device and a cleaning assembly, the joint having an inlet flow channel and an outlet flow channel; the filter cup is connected to the joint, the filter cup has a raw water cavity, a partition is arranged between the filter cup and the joint, and the partition has a central hole capable of connecting the inlet flow channel with the raw water cavity; a guide groove is provided in the joint, a conversion hole capable of connecting with the inlet flow channel is provided in the guide groove, the filter element is slidably arranged in the guide groove, the The filter element has a clean water cavity connected to the water outlet channel, and the side wall of the clean water cavity is provided with a conversion hole 2 which can be connected to the conversion hole 1, and the outer side of the filter element is provided with a flange which can seal and open the center hole; the bottom of the filter cup is provided with a water outlet hole connected to the raw water cavity; the driving device is arranged above the filter element and can drive the filter element to slide, so that the conversion hole 2 is connected to the conversion hole 1, or the conversion hole 2 is covered by the side wall of the guide groove, and at the same time, the opening and closing part can block or open the water outlet hole; the cleaning component is arranged in the raw water cavity and can clean the filter element and / or the raw water cavity.

[0007] Through the above technical scheme, in the normal filtering state, the second conversion hole is covered by the inner wall of the guide groove, and the flange on the filter element is misaligned with the partition, and the raw water (water to be filtered) enters the raw water cavity through the water inlet channel and the center hole, and then passes through the filter element to become clean water (filtered water) and is discharged through the water outlet channel, and the impurities mixed in the raw water are retained by the filter element in the raw water cavity; when the pre-filter is used for a long time or there are many impurities in the raw water cavity, the opening and closing member is opened, so that the water containing impurities in the raw water cavity is discharged to the outside through the water outlet hole. At the same time, the filter element is driven to move, so that the second conversion hole is connected to the first conversion hole, and the center hole is sealed by the flange. At this time, it is in the backwashing state, and the raw water can only enter the clean water cavity through the water inlet channel, the first conversion hole, and the second conversion hole. Then the raw water in the clean water cavity passes through the filter element and flows out in the direction of the raw water cavity, thereby flushing the impurities attached to the outside of the filter element into the raw water cavity, so that the impurities in the raw water cavity and on the filter element are all discharged through the water outlet hole, so as to achieve the purpose of better cleaning effect.

[0008] Preferably, the pre-filter further comprises a driving device, and the driving device can drive the filter element to slide, so that the second conversion hole is connected to the first conversion hole, or the second conversion hole is covered by the side wall of the guide groove.

[0009] Through the above technical solution, the filter element is driven to slide by the driving device, which is convenient for the user to switch the filtering state or the backwashing state of the filter, and is easy to use.

[0010] Preferably, a mounting hole connected to the guide groove is provided on the joint, and a water outlet connecting the clean water chamber to the water outlet channel is provided on the filter element; the driving device includes a positioning seat and a screw rod, the positioning seat is arranged in the mounting hole, the screw rod is rotatably arranged in the positioning seat, and the inner end of the screw rod is threadedly connected to the filter element.

[0011] Through the above technical scheme, once the positioning seat seals the mounting hole, the screw rod can be rotated to drive the filter element as a whole to slide, thereby driving the filter element, and the filter element can be reset by rotating the screw rod in the opposite direction; the clean water in the clean water chamber can flow into the water outlet channel through the water outlet, thereby realizing the clean water outlet of the filter.

[0012] Preferably, the joint is provided with a second mounting hole connected to the guide groove; the driving device includes a second positioning seat, a fixing seat, an electromagnetic coil, a connecting rod, a moving iron core and a reset spring, the second positioning seat is arranged in the second mounting hole, the fixing seat is arranged on the joint, the electromagnetic coil is arranged in the fixing seat, the upper end of the connecting rod passes through the second positioning seat and is connected to the moving iron core, the lower end of the connecting rod is connected to the filter element, and the connecting rod is provided with a connecting hole connected to the water outlet channel, the reset spring is arranged between the connecting rod and the fixing seat, and can push the connecting rod to move.

[0013] Through the above technical solution, the electromagnetic coil generates magnetism after being energized, and drives the connecting rod, the moving iron core, and the filter element to move as a whole, thereby driving the filter element; after the electromagnetic coil is de-energized, the pre-tightening force applied by the reset spring to the connecting rod can push the connecting rod, the moving iron core, and the filter element to move as a whole and reset.

[0014] Preferably, the cleaning assembly includes a positioning box, an impeller and a rotating frame, the positioning box is arranged in the raw water chamber, a plurality of guide holes connected to the raw water chamber are opened on the positioning box, the impeller is rotatably arranged in the positioning box, the rotating frame is connected to the impeller, and the rotating frame is located outside the filter element, and a cleaning part capable of cleaning the filter element and / or the raw water chamber is provided on the rotating frame.

[0015] Through the above technical scheme, the water outlet is opened by the opening and closing member, and the water flow and impurities in the raw water cavity enter the positioning box through the guide hole 1, and are then discharged through the lower end of the positioning box and the water outlet; in this process, the water flow is guided by the guide hole 1 and then impacts the impeller, so that the impeller drives the rotating frame to rotate, and the cleaning part on the rotating frame cleans the filter element or the raw water cavity with the rotation of the rotating frame, and the rotating rotating frame drives the water flow in the raw water cavity to rotate, thereby accelerating the discharge of impurities from the water outlet, and the rotating water flow can also further clean the filter element under the action of centrifugal force.

[0016] Preferably, a second flow guide hole connected to the first flow guide hole is formed at the lower end of the positioning box.

[0017] Through the above technical solution, the cooperation between the first guide hole and the second guide hole enables the water flow below the positioning box to rotate, thereby increasing the efficiency of the water flow discharged from the water outlet.

[0018] Preferably, a groove is provided at the lower end of the impeller, a center column is provided in the positioning box, and a pointed head in contact with the bottom of the groove is provided at the upper end of the center column.

[0019] Through the above technical solution, the center column extends into the groove, and while positioning the impeller, it can effectively avoid friction between the impeller and the positioning box, thereby facilitating the rotation of the impeller.

[0020] Preferably, a drain pipe is provided in the water outlet, and the drain pipe has a drain hole 1 capable of connecting the raw water chamber to the outside world; the opening and closing component includes an extension rod, one end of the extension rod passes through the positioning box, impeller, rotating frame and is connected to the filter element, and the lower end of the extension rod is provided with a plug capable of sealing the drain hole 1.

[0021] Through the above technical solution, when the driving device drives the filter element to move, it can drive the extension rod to move synchronously, that is, the filter element moves up, and the plug opens the drain hole, and the impurities and raw water in the raw water cavity are discharged through the drain hole.

[0022] Preferably, a connecting bolt is provided in the water outlet hole, and a second sewage hole capable of connecting the raw water cavity to the outside is opened in the connecting bolt; the opening and closing member includes a sewage valve connected to the connecting bolt.

[0023] Through the above technical solution, the connection and disconnection between the raw water chamber and the outside world is controlled solely by the drain valve, which is relatively simple to operate and convenient for users to use.

[0024] Preferably, an interception net capable of covering the conversion hole is provided in the joint.

[0025] Through the above technical scheme, since after conversion hole one is connected to conversion hole two, the passage between the raw water chamber and the water inlet channel is blocked by the partition and the flange, the raw water in the water inlet channel can only enter the clean water chamber through conversion hole one and conversion hole two, while the raw water chamber is connected to the water outlet channel, and the interception net one can effectively prevent impurities in the raw water from entering the clean water chamber through conversion hole one and conversion hole two, thereby ensuring that the clean water chamber is always clean.

[0026] Preferably, the filter element is provided with an interception net 2 capable of covering the conversion hole 2.

[0027] Through the above technical solution, interception net 2 can effectively prevent impurities in the raw water from entering the water purification chamber through conversion hole 1 and conversion hole 2.

[0028] Preferably, the inner wall of the guide groove is provided with a water inlet groove connected to the conversion hole 1, and the conversion hole 2 is provided with a plurality of water inlet grooves in a circumferential direction, and a plurality of the conversion holes 2 can be connected to the water inlet grooves.

[0029] Through the above technical solution, the water inlet groove is connected with the conversion hole 1, which indirectly increases the connection area between the conversion hole 1 and the water inlet channel. When the filter element moves to the conversion hole 1 to connect with the conversion hole 2, part of the conversion hole 2 is connected with the water inlet groove, thereby increasing the flow rate entering the water purification chamber and further increasing the cleaning effect of the filter element.

[0030] Preferably, the pre-filter further comprises a protective shell arranged on the outside of the filter cup, and the protective shell can surround the filter cup.

[0031] Through the above technical solution, the protective shell wraps the filter cup. When the filter cup is damaged or broken due to water hammer or freezing, the water leaking from the damaged part of the filter cup is intercepted by the protective shell, thereby avoiding affecting the normal life of residents due to the filter damage.

[0032] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0033] 1. By moving the filter element, the filtration state and backwashing state can be switched, which is convenient to use;

[0034] 2. In the sewage discharge state, the discharged water flow can drive the impeller and the rotating frame to rotate synchronously, and the rotating frame drives the water flow in the raw water chamber to rotate, so that the water and impurities in the raw water chamber can be discharged faster, and the inner wall of the filter element and the filter cup can also be cleaned;

[0035] 3. In the backwashing state, the amount of water flowing out from the inner side of the water purification chamber is sufficient, and the backwashing effect of the filter element is better;

[0036] 4. The protective shell can effectively prevent the filter cup from bursting or being damaged and leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the external structure of the first embodiment;

[0038] Figure 2 for Figure 1 Schematic diagram of the full cross-section structure;

[0039] Figure 3 for Figure 1 Schematic diagram of the explosion structure;

[0040] Figure 4 It is a partial cross-sectional schematic diagram of Embodiment 1;

[0041] Figure 5This is a schematic diagram of the structure of the joint, filter cup and partition after assembly in Example 1;

[0042] Figure 6 It is a schematic diagram of the full cross-section structure of the joint in the first embodiment, mainly used to show the interception net 1;

[0043] Figure 7 It is a structural schematic diagram of the skeleton in the first embodiment, mainly used to show the second interception net;

[0044] Figure 8 It is another structural schematic diagram of the skeleton in the first embodiment, mainly used to show the second interception net;

[0045] Fig. 9 It is a schematic diagram of the structure of the cleaning component in the embodiment;

[0046] Fig.10 This is a schematic diagram of the full cross-section structure of the filtering state of Example 1 (the direction of the arrow is the direction of water flow);

[0047] Fig.11 It is a schematic diagram of the full cross-section structure of the backwashing state of Example 1;

[0048] Fig.12 This is a schematic diagram of the full cross-section structure of Example 2;

[0049] Fig.13 for Fig.12 A partial cross-sectional schematic diagram of

[0050] Fig.14 This is a schematic diagram of the full cross-section structure of Example 3;

[0051] Fig.15 It is a schematic diagram of a part of the explosion structure in the third embodiment;

[0052] Fig.16 This is a schematic diagram of the full cross-section structure of Example 4.

[0053] Reference numerals: 100, joint; 110, water inlet channel; 120, water outlet channel; 130, guide groove; 131, conversion hole 1; 132, water inlet groove; 140, mounting hole 1; 141, shoulder; 142, slide groove; 150, mounting hole 2; 160, interception net 1;

[0054] 200, filter cup; 210, raw water chamber; 220, water outlet; 221, sewage pipe; 2211, sewage outlet first; 222, connecting bolt; 2221, sewage outlet second;

[0055] 300, filter element; 310, frame; 311, water purification chamber; 312, conversion hole 2; 313, flange; 314, water outlet; 315, interception net 2; 316, slider; 320, filter net; 330, connector;

[0056] 400, opening and closing parts; 410, extension rod; 411, plug; 412, rubber sleeve; 420, drain valve;

[0057] 500, partition; 510, center hole;

[0058] 600, driving device; 610, positioning seat 1; 620, screw rod; 621, hand wheel; 630, positioning seat 2; 640, fixing seat; 650, electromagnetic coil; 660, connecting rod; 661, connecting hole; 670, moving iron core; 680, return spring;

[0059] 700, cleaning assembly; 710, positioning box; 711, guide hole 1; 712, guide hole 2; 713, center column; 7131, pointed head; 714, support ring; 720, impeller; 721, groove; 7211, reinforcing cap; 730, rotating frame; 731, cleaning part; 7311, brush 1; 7312, brush 2;

[0060] 800. Protective shell. DETAILED DESCRIPTION

[0061] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0062] The present invention is further described in detail below in conjunction with the accompanying drawings. Embodiment 1:

[0063] A backwash pre-filter, such as Figures 1 to 11 As shown, the pre-filter includes a connector 100, a filter cup 200, a filter element 300 and an opening and closing member 400. The connector 100 has a water inlet channel 110 and a water outlet channel 120.

[0064] The filter cup 200 is connected to the connector 100, and the filter cup 200 has a raw water cavity 210. A partition 500 is provided between the filter cup 200 and the connector 100, and the partition 500 has a central hole 510 that can connect the water inlet channel 110 with the raw water cavity 210;

[0065] A guide groove 130 is provided in the joint 100, and a conversion hole 131 is provided in the guide groove 130 to connect to the water inlet channel 110;

[0066] The filter element 300 may be a common filter element 300 in the prior art, generally comprising a frame 310 and a filter screen 320 disposed on the frame 310, the upper end of the frame 310 being slidably disposed in the guide groove 130, the frame 310 having a clean water cavity 311 connected to the water outlet channel 120, and a conversion hole 2 312 capable of connecting to the conversion hole 1 131 is provided on the side wall of the clean water cavity 311, and a flange 313 capable of sealing the center hole 510 is disposed on the outer side of the frame 310, as another solution, the flange 313 may also be snap-fitted or threadedly connected to the outer side of the frame 310;

[0067] A water outlet hole 220 communicating with the raw water chamber 210 is provided at the bottom of the filter cup 200 , and the opening and closing member 400 can block or open the water outlet hole 220 .

[0068] The pre-filter further includes a driving device 600 , which can drive the filter element 300 to slide, so that the second conversion hole 312 is connected to the first conversion hole 131 , or the second conversion hole 312 is covered by the side wall of the guide groove 130 .

[0069] Furthermore, the skeleton 310 is provided with a water outlet 314 for connecting the clean water chamber 311 to the water outlet channel 120. The filter element 300 also includes a connector 330, which can be integrally formed with the skeleton 310 or detachably connected. To ensure the discharge efficiency of clean water, a plurality of water outlets 314 can also be provided on the skeleton 310 and / or the connector 330. The joint 100 is provided with a mounting hole 140 connected to the guide groove 130. The driving device 600 includes a positioning seat 1610 and a screw rod 620. The positioning seat 1610 is arranged in the mounting hole 140 and seals the mounting hole 140. The screw rod 620 is rotatably arranged in the positioning seat 1610, and the inner end of the screw rod 620 is threadedly connected to the connector 330. To increase the comfort of user adjustment, a hand wheel 621 can be connected to the outer end of the screw rod 620.

[0070] like Figure 3 , Figure 6 As shown, there is a shoulder 141 between the mounting hole 140 and the guide groove 130 , and the shoulder 141 can limit the axial position of the frame 310 . A slide groove 142 is provided on the shoulder 141 . A slider 316 is provided at the upper end of the frame 310 , and the slider 316 can slide in the slide groove 142 .

[0071] The pre-filter also includes a cleaning assembly 700, which includes a positioning box 710, an impeller 720 and a rotating frame 730. The positioning box 710 is arranged in the raw water chamber 210, and a plurality of guide holes 711 connected to the raw water chamber 210 are opened on the positioning box 710. The impeller 720 is rotatably arranged in the positioning box 710, and a support ring 714 for reducing friction is arranged between the impeller 720 and the positioning box 710. As another solution, the support ring 714 can also be The rotating frame 730 is replaced with a plane bearing, and the impeller 720 is connected to the rotating frame 730, and the rotating frame 730 is located outside the filter element 300. The rotating frame 730 is provided with a cleaning member 731 capable of cleaning the filter element 300 and / or the raw water chamber 210. The cleaning member 731 can be a brush 1 7311 and a brush 2 7312 provided on the rotating frame 730, and the bristles of the brush 1 7311 are in contact with the outer wall of the filter screen 320, and the bristles of the brush 2 7312 are in contact with the side wall of the raw water chamber 210. As a solution, the brush 1 7311 can also be replaced with a rubber scraper 1 that fits the outer wall of the filter screen 320, and the brush 2 7312 can be replaced with a rubber scraper 2 that fits the wall of the raw water chamber 210.

[0072] The diversion hole 1 711 is tilted, and the tilt direction of the diversion hole 1 711 can be the same as the Coriolis force of the use area. For example, if the Coriolis force in the northern hemisphere is to the right, the diversion hole 1 711 is toward the right.

[0073] Furthermore, the lower end of the positioning box 710 is provided with a second flow guide hole 712 connected to the first flow guide hole 711, and the second flow guide hole 712 is adapted to the first flow guide hole 711, that is, the second flow guide hole 712 and the first flow guide hole 711 are inclined to the same side. Of course, the second flow guide hole 712 can also be an ordinary through hole.

[0074] Preferably, a drain pipe 221 is provided in the water outlet 220, and the drain pipe 221 has a drain hole 2211 that can connect the raw water chamber 210 to the outside world; the opening and closing component 400 includes an extension rod 410, one end of the extension rod 410 passes through the positioning box 710, the impeller 720, the rotating frame 730 and is connected to the filter element 300, and the lower end of the extension rod 410 is provided with a plug 411 that can seal the drain hole 2211; in order to increase the sealing performance of the plug 411, a rubber sleeve 412 can be sleeved on the outside of the plug 411, and the outer ring of the rubber sleeve 412 can seal the drain hole 2211.

[0075] like Figures 6 to 8As shown, as a preferred embodiment, an interception net 160 capable of covering the conversion hole 131 is provided in the joint 100. As another solution, an interception net 2 315 capable of covering the conversion hole 2 312 is provided on the inner wall or outer wall of the frame 310. The interception net 160 and the interception net 2 315 can be provided at one or the other. To ensure the cleanliness of the water purification chamber 311, both can be installed. The inner wall of the guide groove 130 is provided with a water inlet groove 132 connected to the conversion hole 131. A plurality of conversion holes 312 are provided in the circumferential direction, and a plurality of conversion holes 312 can be connected to the water inlet groove 132.

[0076] like Fig.10 As shown, the pre-filter also includes a protective shell 800 disposed on the outside of the filter cup 200, and the protective shell 800 can surround the filter cup 200. The protective shell 800 can be integrally formed with the filter cup 200, or can be directly connected to the connector 100, as long as the filter cup 200 is accommodated in the protective shell 800.

[0077] Working principle of a backwash pre-filter:

[0078] In a normal filtering state, the second conversion hole 312 is covered by the inner wall of the guide groove 130 , and the flange 313 on the filter element 300 is misaligned with the partition plate 500 , and the plug 411 seals the first drain hole 2211 .

[0079] The raw water (water to be filtered) enters the raw water chamber 210 through the water inlet channel 110 and the center hole 510, then passes through the filter element 300 to become clean water (filtered water) and is discharged through the water outlet 314 and the water outlet channel 120. The impurities contained in the raw water are retained in the raw water chamber 210 by the filter element 300, thereby realizing the filtration of the pre-filter.

[0080] When the pre-filter is used for a long time or a lot of debris is accumulated in the raw water chamber 210, the hand wheel 621 is rotated so that the hand wheel 621 drives the screw rod 620 to rotate, thereby driving the filter element 300 and the plug 411 to move upward as a whole, and finally the plug 411 opens the drainage hole 1 2211, the flange 313 seals the center hole 510, and the conversion hole 2 312 is connected with the conversion hole 1 131 and the water inlet tank 132, and it is in the backwash state at this time;

[0081] The water and impurities in the raw water chamber 210 are discharged to the outside through the drainage hole 1 2211. The raw water in the water inlet channel 110 passes through the interception net 1 160 or the interception net 2 315, and then flows into the clean water chamber 311 through the conversion hole 131, the water inlet trough 132, and the conversion hole 2 312. A large flow of water flows out from the clean water chamber 311 to the raw water chamber 210, and the impurities adsorbed on the filter 320 are flushed into the raw water chamber 210; at the same time, the water in the raw water chamber 210 is guided by the guide hole 1 711 and then impacts the impeller 720, and discharged from the positioning box 710 through the second guide hole 712, so that the impeller 720 and the rotating frame 730 rotate as a whole, and the cleaning member 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 rotating frame 730 drives the water flow in the raw water chamber 210 to rotate along the direction of the Coriolis force, so that the rotating water flow cleans the raw water chamber 210 and the filter element 300, and also accelerates the discharge of water mixed with impurities from the drain hole 1 2211.

[0082] After the filter element 300 is cleaned, the hand wheel 621 is rotated in the opposite direction, so that the filter element 300 and the plug 411 move downward and reset as a whole, and finally the plug 411 seals the drain hole 2211, the flange 313 on the filter element 300 is misaligned with the partition 500, and the conversion hole 2 312 is covered by the inner wall of the guide groove 130, and the pre-filter enters the normal filtering state. Embodiment 2:

[0083] The difference between the second embodiment and the first embodiment is that: Figure 12 to Figure 13 As shown, the joint 100 is provided with a second mounting hole 150 connected to the guide groove 130; the driving device 600 includes a second positioning seat 630, a fixing seat 640, an electromagnetic coil 650, a connecting rod 660, a moving iron core 670 and a reset spring 680, the second positioning seat 630 is arranged in the second mounting hole 150, the fixing seat 640 is arranged on the joint 100, the electromagnetic coil 650 is arranged in the fixing seat 640, the upper end of the connecting rod 660 passes through the second positioning seat 630 and is connected to the moving iron core 670, the lower end of the connecting rod 660 is connected to the frame 310, and the connecting rod 660 is provided with a connecting hole 661 connected to the water outlet channel 120, and the reset spring 680 is arranged between the connecting rod 660 and the fixing seat 640, and can push the connecting rod 660 to move.

[0084] Working principle:

[0085] The electromagnetic coil 650 is energized, and the electromagnetic coil 650 generates magnetic force and drives the moving iron core 670 to move upward, thereby causing the connecting rod 660, the filter element 300, and the plug 411 to move upward as a whole, and the return spring 680 is compressed by the connecting rod 660 in the fixing seat 640, completing the movement of the filter element 300 moving upward;

[0086] When the electromagnetic coil 650 is powered off, the moving iron core 670 loses its magnetic control, and the pre-tightening force applied by the reset spring 680 to the connecting rod 660 pushes the connecting rod 660, the moving iron core 670, the filter element 300, and the plug 411 downward as a whole to reset, and the reset action of the filter element 300 is completed. Embodiment three:

[0087] The difference between the third embodiment and the first embodiment is that: Figure 14 to Figure 15 As shown, a groove 721 is formed at the lower end of the impeller 720 , a center 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 center column 713 .

[0088] Furthermore, in order to reduce the wear of the center column 713 and the groove 721 , a reinforcement cap 7211 is provided in the groove 721 , the center column 713 can be inserted into the reinforcement cap 7211 , and the pointed head 7131 contacts the inside of the reinforcement cap 7211 . Embodiment 4:

[0089] The difference between the fourth embodiment and the first embodiment is that: Fig.16 As shown, a connecting bolt 222 is provided in the water outlet 220, and a drain hole 2221 is provided in the connecting bolt 222 for connecting the raw water chamber 210 to the outside world; the opening and closing component 400 includes a drain valve 420 connected to the connecting bolt 222, and the drain valve 420 can be a common ball valve in the prior art.

[0090] Working principle:

[0091] In the filtering state, the second conversion hole 312 is covered by the inner wall of the guide groove 130, and the flange 313 on the filter element 300 is misaligned with the partition 500, and the drain valve 420 seals the second drain hole 2221. The raw water enters the raw water cavity 210 through the water inlet channel 110 and the center hole 510, and then passes through the filter element 300 to become clean water and is discharged through the water outlet 314 and the water outlet channel 120. The impurities mixed in the raw water are retained in the raw water cavity 210 by the filter element 300, thereby achieving the filtering of the pre-filter.

[0092] When it is necessary to switch to the backwash state, the drain valve 420 is opened so that the drain hole 2221 connects the raw water chamber 210 to the outside, and then the hand wheel 621 is rotated so that the hand wheel 621 drives the screw rod 620 to rotate, thereby driving the filter element 300 to move upward, and finally the flange 313 seals the center hole 510, and the conversion hole 2 312 is connected with the conversion hole 1 131 and the water inlet groove 132;

[0093] The water and impurities in the raw water chamber 210 are discharged to the outside through the drain hole 2221, and the raw water in the water inlet channel 110 passes through the interception net 160 or the interception net 2 315, and then flows into the clean water chamber 311 through the conversion hole 131, the water inlet trough 132, and the conversion hole 2 312. A large flow of water flows out from the clean water chamber 311 to the raw water chamber 210, and the impurities adsorbed on the filter 320 are flushed into the raw water chamber 210; at the same time, the water flow in the raw water chamber 210 is guided by the guide hole 1 711 and then impacts the impeller 720, and discharged from the positioning box 710 through the second guide hole 712, so that the impeller 720 and the rotating frame 730 rotate as a whole, and the cleaning member 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 rotating frame 730 drives the water flow in the raw water chamber 210 to rotate along the direction of the Coriolis force, so that the rotating water flow cleans the raw water chamber 210 and the filter element 300, and also accelerates the water mixed with impurities to be discharged from the second drain hole 2221.

[0094] After the filter element 300 is cleaned, the drain valve 420 is closed and the hand wheel 621 is rotated in the opposite direction to move the filter element 300 downward and reset. Finally, the drain valve 420 seals the drain hole 2221, the flange 313 is misaligned with the partition 500, and the conversion hole 2 312 is covered by the inner wall of the guide groove 130, and the pre-filter enters the filtering state.

[0095] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A backwash pre-filter, characterized in that: The pre-filter comprises a joint (100), a filter cup (200), a filter element (300), an opening and closing member (400), a driving device (600) and a cleaning assembly (700); the joint (100) has a water inlet channel (110) and a water outlet channel (120); the filter cup (200) is connected to the joint (100); the filter cup (200) has a raw water cavity (210); a filter element (300) is provided between the filter cup (200) and the joint (100); The partition (500) has a central hole (510) capable of connecting the water inlet channel (110) with the raw water chamber (210); a guide groove (130) is provided in the joint (100), a conversion hole (131) capable of connecting with the water inlet channel (110) is provided in the guide groove (130), and the filter element (300) is slidably arranged in the guide groove (130), and the filter element (300) has a conversion hole (131) capable of connecting with the water inlet channel (110). The filter element (300) is provided with a flange (313) on the outside of the filter element (300) for sealing and opening the central hole (510); a water outlet hole (220) is provided at the bottom of the filter cup (200) for connecting with the raw water chamber (210); and the driving device (600) is arranged on the filter element (300). 00) and can drive the filter element (300) to slide, so that the conversion hole 2 (312) is connected to the conversion hole 1 (131), or the conversion hole 2 (312) is covered by the side wall of the guide groove (130), and at the same time, the opening and closing member (400) can block or open the water outlet hole (220); the cleaning component (700) is arranged in the raw water chamber (210) and can clean the filter element (300) and / or the raw water chamber (210).

2. The backwash pre-filter according to claim 1, characterized in that: The joint (100) is provided with a mounting hole (140) connected to the guide groove (130), and the filter element (300) is provided with a water outlet (314) connecting the clean water chamber (311) to the water outlet channel (120); the driving device (600) comprises a positioning seat (610) and a screw rod (620), the positioning seat (610) is arranged in the mounting hole (140), the screw rod (620) is rotatably arranged in the positioning seat (610), and the inner end of the screw rod (620) is threadedly connected to the filter element (300).

3. The backwash pre-filter according to claim 1, characterized in that: The connector (100) is provided with a second mounting hole (150) connected to the guide groove (130); the driving device (600) comprises a second positioning seat (630), a fixing seat (640), an electromagnetic coil (650), a connecting rod (660), a moving iron core (670) and a reset spring (680); the second positioning seat (630) is arranged in the second mounting hole (150); the fixing seat (640) is arranged on the connector (100); the electromagnetic coil (650) is arranged Placed in the fixing seat (640), the upper end of the connecting rod (660) passes through the second positioning seat (630) and is connected to the moving iron core (670), the lower end of the connecting rod (660) is connected to the filter element (300), and the connecting rod (660) is provided with a connecting hole (661) connected to the water outlet channel (120), and the return spring (680) is arranged between the connecting rod (660) and the fixing seat (640) and can push the connecting rod (660) to move.

4. The backwash pre-filter according to any one of claims 1 to 3, characterized in that: The cleaning component (700) comprises a positioning box (710), an impeller (720) and a rotating frame (730); the positioning box (710) is arranged in the raw water chamber (210); a plurality of guide holes (711) connected to the raw water chamber (210) are opened on the positioning box (710); the impeller (720) is rotatably arranged in the positioning box (710); the rotating frame (730) is connected to the impeller (720), and the rotating frame (730) is located outside the filter element (300); and a cleaning component (731) capable of cleaning the filter element (300) and / or the raw water chamber (210) is arranged on the rotating frame (730).

5. The backwash pre-filter according to claim 4, characterized in that: A second flow guide hole (712) communicating with the first flow guide hole (711) is formed at the lower end of the positioning box (710).

6. The backwash pre-filter according to claim 4, characterized in that: The lower end of the impeller (720) is provided with a groove (721), a center column (713) is arranged in the positioning box (710), and the upper end of the center column (713) is provided with a pointed head (7131) that contacts the bottom of the groove (721).

7. The backwash pre-filter according to claim 4, characterized in that: A sewage pipe (221) is arranged in the water outlet hole (220), and the sewage pipe (221) has a sewage hole (2211) capable of connecting the raw water chamber (210) to the outside world; the opening and closing member (400) comprises an extension rod (410), one end of which passes through the positioning box (710), the impeller (720), the rotating frame (730) and is connected to the filter element (300), and the lower end of the extension rod (410) is provided with a plug (411) capable of sealing the sewage hole (2211).

8. The backwash pre-filter according to claim 4, characterized in that: The water outlet hole (220) is provided with a connecting bolt (222), and the connecting bolt (222) is provided with a second sewage hole (2221) capable of connecting the raw water chamber (210) to the outside; the opening and closing member (400) includes a sewage valve (420) connected to the connecting bolt (222).

9. The backwash pre-filter according to any one of claims 1 to 3, characterized in that: An interception net (160) capable of covering the conversion hole (131) is arranged in the joint (100).

10. The backwash pre-filter according to any one of claims 1 to 3, characterized in that: The filter element (300) is provided with an interception net (315) 2 capable of covering the conversion hole (312).

11. The backwash pre-filter according to any one of claims 1 to 3, characterized in that: The inner wall of the guide groove (130) is provided with a water inlet groove (132) connected to the conversion hole 1 (131), and a plurality of conversion holes 2 (312) are provided in a circumferential direction, and a plurality of the conversion holes 2 (312) can be connected to the water inlet groove (132).

12. The backwash pre-filter according to any one of claims 1 to 3, characterized in that: The pre-filter further comprises a protective shell (800) arranged outside the filter cup (200), and the protective shell (800) is capable of surrounding the filter cup (200).

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