An automatic backwashing pre-filter

Abstract

The present invention discloses an automatic backwashing pre-filter, which relates to the technical field of filtering devices. The key points of its technical solution are as follows: It includes a filter cup, a connector, a filter element, and a control component. The filter cup is connected to the connector. The connector has an influent water passage and an effluent water passage. A raw water chamber is arranged in the filter cup. The influent water passage is communicated with the raw water chamber through a water passing port. The filter cup has a sewage discharge port, and the sewage discharge port is communicated with the raw water chamber. The control component can open or close the sewage discharge port; a purified water chamber is arranged in the filter element. The effluent water passage is connected to the purified water chamber. The filter element has a conversion hole. A shielding member is slidably arranged on the filter element. The shielding member can cover the conversion hole. Water flow can impact the shielding member, causing the shielding member to slide and block the water passing port. The conversion hole communicates the influent water passage with the purified water chamber. A reset member capable of resetting the shielding member is arranged on the filter element. This pre-filter can automatically switch between the filtering state and the backwashing state.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering devices, and particularly relates to an automatic backwashing pre-filter. Background Art

[0002] At present, with the progress of technology and the improvement of living standards, people have higher requirements for the quality of drinking water. Usually, a pre-filter is installed on the pipeline before the faucet, and the drinking water can be filtered and purified after passing through the pre-filter and flowing out from the faucet. There are three types of pre-filters in the prior art, namely, a positive flushing pre-filter, a siphon pre-filter, and a backwashing pre-filter. Among them, the positive flushing pre-filter has a large flushing flow rate and good flushing effect for large particle dirt, but only relies on water flow to flush the surface of the filter screen. For the strong adherent attachments on the filter screen, the cleaning effect is poor. The siphon pre-filter has a good sewage discharge effect for the strong adherent dirt on the filter screen, but the suction port must be very close to the filter screen. Otherwise, the negative pressure suction is weak, and large particles are likely to deposit in the filter cup of the filter and cannot be discharged, affecting the cleaning effect. The backwashing pre-filter uses water flow to flush from the inside to the outside of the filter screen, and has a good sewage discharge effect for the strong adherent dirt on the filter screen. However, the current backwashing pre-filter requires users to manually switch the filtering state or the backwashing state, which is inconvenient to use. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an automatic backwashing pre-filter, which has the advantage of convenient use.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: It includes a filter cup, a connector, a filter element, and a control component. The filter cup is connected to the connector. The connector has an inlet water flow channel and an outlet water flow channel. A raw water chamber is arranged in the filter cup. The inlet water flow channel is communicated with the raw water chamber through a water passing port. The filter cup has a sewage discharge port, and the sewage discharge port is communicated with the raw water chamber. The control component can open or close the sewage discharge port. A purified water chamber is arranged in the filter element. The outlet water flow channel is communicated with the purified water chamber. The filter element has a conversion hole. A shielding member is slidably arranged on the filter element. The shielding member includes a shielding block and a shielding convex block. The outer side wall of the shielding block extends outward to form the shielding convex block. The shielding block can cover the conversion hole. Water flow can act on the shielding member to make the shielding convex block slide and block the water passing port. The conversion hole communicates the inlet water flow channel with the purified water chamber. A reset member is arranged on the filter element to reset the shielding member.

[0005] Through the above technical solution, the blocking block is used to cover the conversion hole, and the blocking bump is used to block the water passing port. Under normal filtration conditions, the conversion hole is covered by the blocking member, and water flows through the water inlet channel and the water passing port into the raw water cavity, and then passes through the filter element into the purified water cavity. The impurities mixed in the water are intercepted by the filter element in the raw water cavity and then discharged outward through the water outlet channel. When the control component opens the sewage outlet, the blocking member slides under the impact of water flow and its own gravity and blocks the water passing port. After the blocking member slides, it can no longer cover the conversion hole, and water can flow through the water inlet channel and the conversion hole into the purified water cavity. Then, the water in the purified water cavity flows out through the filter element in the direction of the raw water cavity, so as to flush the impurities attached to the outside of the filter element into the raw water cavity. All the impurities in the raw water cavity and on the filter element are discharged through the sewage outlet, and under the action of the reset member, the blocking member is reset, the blocking member cannot block the water passing port, the water passing port connects the water inlet channel and the raw water cavity, the blocking member covers the conversion hole, and water cannot enter the purified water cavity through the conversion hole, thereby realizing the automatic switching between the filtration state and the backwashing state, which is convenient to use.

[0006] Preferably, the blocking block is provided with a through hole, the filter element is inserted through the through hole, and the blocking block is slidably connected to the filter element.

[0007] Through the above technical solution, the filter element is inserted through the through hole, and the blocking block is slidably connected to the filter element. Under the impact of water flow, the blocking block can move along the filter element.

[0008] Preferably, the reset member includes a spring. The spring is sleeved on the outer side wall of the filter element, and a flange is formed by the outer side wall of the filter element extending outward. One end of the spring abuts against the lower end surface of the blocking member, and the other end of the spring abuts against the upper end surface of the flange.

[0009] Through the above technical solution, under the impact of water flow and its own gravity, the blocking member slides and compresses the spring. When the impact of water flow disappears or weakens, the force generated by the elastic deformation of the spring can push the blocking member to slide and reset the blocking member.

[0010] Preferably, the reset member includes a magnet one and a magnet two. The magnet one is installed on the filter element, the magnet two is installed on the blocking member, the magnet one and the magnet two are magnetically repulsive, and the magnet one and the magnet two cooperate to enable the blocking member to cover the conversion hole.

[0011] Through the above technical solution, the magnet one and the magnet two are magnetically repulsive, and the repulsive force generated between the magnet one and the magnet two can push the blocking member to slide, reset the blocking member and cover the conversion hole again.

[0012] Preferably, the reset member includes Magnet III and Magnet IV. Magnet III is installed on the shielding member, and Magnet IV is installed on the joint. Magnet III and Magnet IV are magnetically attracted to each other, and the cooperation of Magnet III and Magnet IV can make the shielding member cover the conversion hole.

[0013] Through the above technical solution, Magnet III and Magnet IV are magnetically attracted to each other, and the attractive force generated between Magnet I and Magnet II can pull the shielding member to slide, so that the shielding member is reset and covers the conversion hole again.

[0014] Preferably, the reset member includes Magnet V, Magnet VI and Magnet VII. Magnet V is installed on the filter element, Magnet VI is installed on the shielding member, and Magnet VII is installed on the joint. Magnet V and Magnet VI are magnetically repulsive, and Magnet VI and Magnet VII are magnetically attracted. The cooperation of Magnet V, Magnet VI and Magnet VII can make the shielding member cover the conversion hole.

[0015] Through the above technical solution, Magnet V and Magnet VI are magnetically repulsive, Magnet VI and Magnet VII are magnetically attracted. The repulsive force generated between Magnet V and Magnet VI can push the shielding member to slide, and the attractive force generated between Magnet VI and Magnet VII can pull the shielding member to slide, so that the shielding member is reset and covers the conversion hole again.

[0016] Preferably, a positioning box is arranged in the raw water chamber. An impeller is rotatably arranged in the positioning box. A rotating frame is arranged in the raw water chamber. A diversion hole is opened on the positioning box. Water flow can impact the impeller through the diversion hole. The rotating frame is connected to the impeller. The rotating frame is located outside the filter element. A cleaning member capable of cleaning the filter element and / or the raw water chamber is arranged on the rotating frame.

[0017] Through the above technical solution, the water flow in the raw water chamber enters the positioning box through the diversion hole to impact the impeller, so that the impeller drives the rotating frame to rotate. The cleaning member on the rotating frame rotates with the rotating frame to clean the filter element or the raw water chamber. And the rotating rotating frame drives the water flow in the raw water chamber to rotate, thereby accelerating the discharge of impurities from the sewage outlet. Under the action of centrifugal force, the rotating water flow can further clean the filter element.

[0018] Preferably, a connecting bolt is arranged in the sewage outlet. A sewage discharge hole capable of communicating the raw water chamber with the outside is opened on the connecting bolt. The sewage discharge hole can be communicated with the raw water chamber. A groove is opened on the lower end surface of the impeller. A central column is connected to the connecting bolt. A pointed head is arranged at the upper end of the central column. The pointed head abuts against the bottom surface of the groove.

[0019] Through the above technical solution, the central column is inserted into the groove to position the impeller, making the impeller rotate more smoothly. Moreover, by the pointed end abutting against the bottom surface of the groove, the friction generated between the impeller and the central column is effectively reduced, and the impurities in the raw water chamber and on the filter element are discharged through the sewage discharge hole.

[0020] Preferably, the control component includes a sewage discharge valve, which is connected to the connecting bolt, and the sewage discharge valve can control the opening or closing of the sewage discharge hole.

[0021] Through the above technical solution, the user can control the opening or closing of the sewage outlet through the sewage discharge valve, realizing the on-off between the raw water chamber and the outside. The operation is simple and convenient to use.

[0022] Preferably, a limiting ring is connected to the outer side wall of the filter element, and the lower end surface of the limiting ring can abut against the upper end surface of the shielding member.

[0023] Through the above technical solution, the lower end surface of the limiting ring abuts against the upper end surface of the shielding member, thereby restricting the position of the shielding member and preventing the shielding member from falling off the filter element under the influence of the spring force.

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

[0025] Through the above technical solution, the intercepting net can prevent impurities in the water flow from entering the purified water chamber through the conversion hole, thus ensuring the cleanliness of the purified water chamber.

[0026] Preferably, there is a protective shell outside the filter cup, and the protective shell can surround the filter cup.

[0027] Through the above technical solution, the protective shell wraps the filter cup. When the filter cup is damaged or cracked due to water hammer or freezing, the water leaking from the damaged part of the filter cup is intercepted by the protective shell, preventing the damage of the filter cup from affecting the normal life of the residents.

[0028] Preferably, the water passing port is opened on the filter cup.

[0029] Through the above technical solution, the water passing port is opened on the filter cup, and the shielding member and the filter cup can cut off the passage between the raw water chamber and the water inlet channel.

[0030] Preferably, a partition is arranged between the filter cup and the joint, and the water passing port is opened on the partition.

[0031] Through the above technical solution, the water passing hole is opened on the partition, and the shielding member and the partition can cut off the passage between the raw water chamber and the water inlet channel.

[0032] Preferably, an isolating member is arranged in the joint, and the isolating member can isolate the water from the joint.

[0033] Through the above technical solution, an isolation member is provided inside the joint. Under the action of the isolation member, water can be prevented from directly contacting the joint, thus preventing the joint from being soaked in water for a long time and continuously releasing heavy metals into the water, which may lead to excessive heavy metals in the water and endanger the health of users.

[0034] Preferably, the isolation member includes a first isolation pipe, a second isolation pipe, and an isolation sleeve. The first isolation pipe is arranged in the water inlet flow channel and can communicate with the water passing port. The second isolation pipe is arranged in the water outlet flow channel, and the isolation sleeve is arranged inside the joint and can communicate the purified water cavity with the second isolation pipe.

[0035] Through the above technical solution, after water passes through the first isolation pipe, it enters the raw water cavity from the water passing port, passes through the filter element and enters the purified water cavity. The water in the purified water cavity flows into the isolation sleeve and then flows out through the second isolation pipe.

[0036] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0037] Under the impact of water flow and the action of the reset member, the shielding member can move along the filter element to automatically switch between the filtering state and the backwashing state, without the need for users to manually switch the filtering state or the backwashing state, which is convenient for users to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a cross-sectional view of Embodiment 1;

[0039] Figure 2 It is a structural schematic diagram of Embodiment 1;

[0040] Figure 3 It is a partial structural schematic diagram of Embodiment 1;

[0041] Figure 4 It is a cross-sectional view of the filter element and the shielding member of Embodiment 1;

[0042] Figure 5 It is an enlarged schematic view of Part A of Embodiment 1;

[0043] Figure 6 It is a structural schematic diagram of the shielding member of Embodiment 1;

[0044] Figure 7 It is a cross-sectional view of the impeller and the connecting bolt of Embodiment 1;

[0045] Figure 8 It is a cross-sectional view of the sewage discharge valve of Embodiment 1;

[0046] Figure 9 It is a structural schematic diagram of the positioning box of Embodiment 1;

[0047] Figure 10 Schematic structural diagram of the rotating frame in the first embodiment;

[0048] Figure 11 Partial cross-sectional view of the second embodiment;

[0049] Figure 12 Partial cross-sectional view of the third embodiment;

[0050] Figure 13 Partial cross-sectional view of the fourth embodiment;

[0051] Figure 14 Partial cross-sectional view of the fifth embodiment;

[0052] Figure 15 Partial cross-sectional view of the sixth embodiment;

[0053] Figure 16 Another partial cross-sectional view of the sixth embodiment.

[0054] Reference numerals: 1, filter cup; 2, joint; 3, filter element; 4, control component; 41, sewage discharge valve; 5, water inlet channel; 6, water outlet channel; 7, raw water chamber; 8, partition; 9, water passing port; 10, sewage discharge port; 11, purified water chamber; 12, conversion hole; 13, shielding member; 131, shielding block; 132, shielding convex block; 14, reset member; 141, spring; 142, magnet one; 143, magnet two; 144, magnet three; 145, magnet four; 146, magnet five; 147, magnet six; 148, magnet seven; 15, through hole; 16, flange; 17, positioning box; 18, impeller; 19, rotating frame; 20, diversion hole; 21, limiting ring; 22, groove; 23, central column; 24, pointed head; 25, connecting bolt; 26, sewage discharge hole; 27, reinforcing cap; 28, intercepting net; 29, protective shell; 30, cleaning member; 301, brush one; 302, brush two; 31, isolating member; 311, isolating pipe one; 312, isolating pipe two; 313, isolating sleeve. Detailed implementation manners

[0055] The present invention will be further described in detail below with reference to the accompanying drawings. Embodiment 1:

[0056] An automatic backwashing pre-filter, as Figures 1 to 10 shown, includes a filter cup 1, a joint 2, a filter element 3, and a control component 4. The joint 2 has a water inlet channel 5 and a water outlet channel 6. The filter cup 1 is threadedly connected to the joint 2. A raw water chamber 7 is arranged in the filter cup 1. The water inlet channel 5 is communicated with the raw water chamber 7 through a water passing port 9. The water passing port 9 is opened at the upper end of the filter cup 1. A purified water chamber 11 is arranged in the filter element 3. The water outlet channel 6 is communicated with the purified water chamber 11.

[0057] The filter cup 1 is provided with a sewage outlet 10 which is communicated with the raw water chamber 7. The control component 4 can open or close the sewage outlet 10. A connecting bolt 25 is arranged in the sewage outlet 10, and a sewage discharge hole 26 which can communicate the raw water chamber 7 with the outside is formed on the connecting bolt 25. The sewage discharge hole 26 can be communicated with the raw water chamber 7 and is also communicated with the outside. The control component 4 includes a sewage discharge valve 41 which is connected with the connecting bolt 25. The sewage discharge valve 41 can control the opening or closing of the sewage discharge hole 26. The sewage discharge valve 41 can adopt a ball valve in the prior art. When the sewage discharge valve 41 controls the opening of the sewage discharge hole 26, the impurities in the raw water chamber 7 and on the filter element 3 are discharged through the sewage discharge hole 26. When the sewage discharge valve 41 controls the closing of the sewage discharge hole 26, the impurities in the raw water chamber 7 and on the filter element 3 cannot be discharged outwards through the sewage discharge hole 26.

[0058] The filter element 3 is provided with a conversion hole 12. Preferably, there are several conversion holes 12 which are evenly arranged along the circumferential direction of the filter element 3. A shielding member 13 is slidably arranged on the filter element 3. The shielding member 13 can cover the conversion hole 12. The water flow can impact the shielding member 13, causing the shielding member 13 to slide and block the water passing port 9. The conversion hole 12 communicates the water inlet flow channel 5 with the purified water chamber 11. A reset member 14 which can reset the shielding member 13 is arranged on the filter element 3. It should be noted that the shielding member 13 is affected by the gravity of itself while being impacted by the water flow. And under the control of the sewage discharge valve 41, when the sewage discharge hole 26 is opened and the sewage discharge hole 26 is communicated with the raw water chamber 7, the water flow can have sufficient impact force to enable the shielding member 13 to block the water passing port 9 after sliding, and the shielding member 13 can no longer cover the conversion hole 12. The conversion hole 12 communicates the water inlet flow channel 5 with the purified water chamber 11.

[0059] Preferably, the shielding member 13 includes a shielding block 131 and a shielding convex block 132. The outer side wall of the shielding block 131 extends outwards to form the shielding convex block 132. The shielding block 131 and the shielding convex block 132 are integrally formed, and the shielding convex block 132 is located at the upper end of the shielding block 131.

[0060] The shielding convex block 132 can block the water passing port 9, and the shielding convex block 132 is adapted to the water passing port 9. Preferably, a sealing ring is arranged on the outer side wall of the shielding convex block 132. As another solution, a sealing ring can also be arranged on the inner wall of the water passing port 9. Setting a sealing ring between the shielding convex block 132 and the water passing port 9 can ensure the sealing performance of the shielding convex block 132 to the water passing port 9.

[0061] The shielding block 131 can cover the conversion hole 12. The shielding block 131 is provided with a through hole 15. The filter element 3 passes through the through hole 15, and the shielding block 131 is slidably connected with the filter element 3. Preferably, at least two sealing rings are arranged on the outer side wall of the filter element 3. As another solution, at least two sealing rings can also be arranged on the hole wall of the through hole 15. Setting at least two sealing rings between the filter element 3 and the shielding block 131 can ensure the sealing performance of the shielding block 131 to the through hole 15.

[0062] The reset member 14 includes a spring 141. The spring 141 is sleeved on the outer sidewall of the filter element 3. A flange 16 is formed by the outward extension of the outer sidewall of the filter element 3. One end of the spring 141 abuts against the lower end surface of the shielding bump 132, and the other end of the spring 141 abuts against the upper end surface of the flange 16.

[0063] A limiting ring 21 is detachably connected to the outer sidewall of the filter element. The lower end surface of the limiting ring 21 can abut against the upper end surface of the shielding bump 132. Preferably, the limiting ring 21 can be a snap ring.

[0064] A positioning box 17 is arranged in the raw water chamber 7. An impeller 18 is rotatably arranged in the positioning box 17. A rotating frame 19 is arranged in the raw water chamber 7. A diversion hole 20 is formed in the positioning box 17. Preferably, there are several diversion holes 20 which are distributed circumferentially. Water flow can impact the impeller 18 through the diversion holes 20, and several diversion holes 20 are all inclined to one side.

[0065] The rotating frame 19 is connected to the impeller 18. The rotating frame 19 is located outside the filter element 3. A cleaning member 30 capable of cleaning the filter element 3 and / or the raw water chamber 7 is arranged on the rotating frame 19. The cleaning member 30 can be a first brush 301 and a second brush 302 arranged on the rotating frame 19. And the bristles of the first brush 301 can contact the outer wall of the filter element 3, and the bristles of the second brush 302 can contact the sidewall of the raw water chamber 7. As another solution, the first brush 301 can also be replaced by a first rubber scraper which can fit the outer wall of the filter element 3, and the second brush 302 can be replaced by a second rubber scraper which can fit the chamber wall of the raw water chamber 7.

[0066] A groove 22 is formed in the lower end surface of the impeller 18. A central column 23 is connected to the connecting bolt 25. The central column 23 is inserted into the upper end of the connecting bolt 25. A pointed head 24 is arranged at the upper end of the central column 23. The pointed head 24 abuts against the bottom surface of the groove 22. Preferably, a reinforcing cap 27 is arranged in the groove 22. The reinforcing cap 27 can reduce the wear between the central column 23 and the groove 22. The central column 23 is inserted into the reinforcing cap 27, and the pointed head 24 abuts against the reinforcing cap 27.

[0067] An intercepting net 28 capable of covering the conversion hole 12 is arranged in the joint 2. The intercepting net 28 can be arranged on the outer sidewall of the filter element 3. Of course, the intercepting net 28 can also be arranged on the inner sidewall of the filter element 3. As long as the intercepting net 28 can cover the conversion hole 12. A protective shell 29 is arranged outside the filter cup 1, and the protective shell 29 can surround the filter cup 1. The protective shell 29 can be integrally formed with the filter cup 1 or directly connected to the joint 2, as long as the filter cup 1 is accommodated in the protective shell 29.

[0068] The working principle of an automatic backwashing pre-filter:

[0069] Under normal filtration conditions, the conversion hole 12 is covered by the blocking block 131, and water flow cannot pass through the conversion hole 12. The water flow can only enter the raw water chamber 7 through the water inlet channel 5 and the water passing port 9, and pass through the filter element 3 into the purified water chamber 11. The impurities mixed in the water flow are intercepted by the filter element 3 in the raw water chamber 7, and the water flow in the purified water chamber 11 is discharged outward through the water outlet channel 6; when the sewage valve 41 controls the opening of the sewage discharge hole 10, the shielding member 13 slides along the filter element 3 under the impact of the water flow and its own gravity, and at the same time squeezes the spring 141. The shielding convex block 132 blocks the water passing port 9, and the blocking block 131 cannot cover the conversion hole 12. The water flow can then enter the purified water chamber 11 through the water inlet channel 5 and the conversion hole 12. The water flow in the purified water chamber 11 passes through the filter element 3 and flows out towards the raw water chamber 7, thereby flushing the sundries attached to the outside of the filter element 3 into the raw water chamber 7. The water flow in the raw water chamber 7 enters the positioning box 17 through the diversion hole 20 and impacts the impeller 18, causing the impeller 18 to drive the rotating frame 19 to rotate. The cleaning member 30 on the rotating frame 19 then cleans the filter element 3 and the raw water chamber 7 as the rotating frame 19 rotates. All the impurities on the raw water chamber 7 and the filter element 3 are discharged outward through the sewage discharge port 10; when the sewage valve 41 closes the sewage discharge port 10, the impact of the water flow disappears or weakens, and the force generated by the elastic deformation of the spring 141 can push the shielding member 13 to slide along the filter element 3 to reset the shielding member 13. The conversion hole 12 is covered by the blocking block 131 again, and the water flow cannot enter the purified water chamber 11 through the conversion hole 12. The shielding convex block 132 cannot block the water passing port 9, and the water passing port 9 connects the water inlet channel 5 and the raw water chamber 7. Embodiment 2:

[0070] The difference between Embodiment 2 and Embodiment 1 is that, as Figure 11 shown, a partition plate 8 is provided between the filter cup 1 and the joint 2. The water passing port 9 is opened on the partition plate 8, and the shielding convex block 132 is located in the middle section of the blocking block 131. The shielding convex block 132 can block the water passing port 9. It should be noted that the adaptive change made to the shape of the shielding member 13 according to the shape change of the water passing port 9 should be regarded as belonging to the same technical category. Embodiment 3:

[0071] The difference between Embodiment 3 and Embodiment 1 is that, as Figure 12As shown, the reset member 14 includes a first magnet 142 and a second magnet 143. The first magnet 142 is installed on the filter element 3, and the second magnet 143 is installed on the shielding member 13. Preferably, both the first magnet 142 and the second magnet 143 are annular. The first magnet 142 is installed on the upper end surface of the flange 16, and the second magnet 143 is installed on the lower end surface of the shielding bump 132. The first magnet 142 and the second magnet 143 repel each other magnetically, and the repulsive force generated between the first magnet 142 and the second magnet 143 can push the shielding member 13 to slide towards the conversion hole 12, so that the shielding member 13 covers the conversion hole 12. Embodiment 4:

[0072] The difference between Embodiment 4 and Embodiment 1 is that, as Figure 13 shown, the reset member 14 includes a third magnet 144 and a fourth magnet 145. The third magnet 144 is installed on the shielding member 13, and the fourth magnet 145 is installed on the joint 2. Preferably, both the third magnet 144 and the fourth magnet 145 are annular. The third magnet 144 is installed on the upper end surface of the shielding bump 132, and the fourth magnet 145 is installed on the inner wall of the joint 2, and the fourth magnet 145 is located above the third magnet 144. The third magnet 144 and the fourth magnet 145 attract each other magnetically, and the attractive force generated between the third magnet 144 and the fourth magnet 145 can pull the shielding member 13 to slide towards the conversion hole 12, so that the shielding member 13 covers the conversion hole 12. Embodiment 5:

[0073] The difference between Embodiment 5 and Embodiment 1 is that, as Figure 14 shown, the reset member 14 includes a fifth magnet 146, a sixth magnet 147 and a seventh magnet 148. The fifth magnet 146 is installed on the filter element 3, the sixth magnet 147 is installed on the shielding member 13, and the seventh magnet 148 is installed on the joint 2. Preferably, the fifth magnet 146 is installed on the upper end surface of the flange 16, the sixth magnet 147 is installed on the lower end surface of the shielding bump 132, and the seventh magnet 148 is installed on the inner wall of the joint 2, and the seventh magnet 148 is located above the sixth magnet 147, and the sixth magnet 147 is located above the fifth magnet 146. The fifth magnet 146 and the sixth magnet 147 repel each other magnetically, and the repulsive force generated between the fifth magnet 146 and the sixth magnet 147 can push the shielding member 13 to slide towards the conversion hole 12. The sixth magnet 147 and the seventh magnet 148 attract each other magnetically, and the attractive force generated between the sixth magnet 147 and the seventh magnet 148 can pull the shielding member 13 to slide towards the conversion hole 12, so that the shielding member 13 covers the conversion hole 12. Embodiment 6:

[0074] The difference between Embodiment 6 and Embodiment 1 is that, as Figures 15 to 16As shown in the figure, a separator 31 is provided inside the connector 2. The separator 31 can isolate water from the connector 2. Preferably, the separator 31 is made of a non-metallic material. The separator 31 includes a first isolation pipe 311, a second isolation pipe 312, and an isolation sleeve 313. The first isolation pipe 311 is arranged in the water inlet flow channel 5 and can communicate with the water passing port 9. The second isolation pipe 312 is arranged in the water outlet flow channel 6. The isolation sleeve 313 is arranged inside the connector 2 and can communicate the purified water cavity 11 with the second isolation pipe 312. The lower end of the isolation sleeve 313 is fixed between the connector 2 and the filter cup 1. It should be noted that the first isolation pipe 311, the second isolation pipe 312, and the isolation sleeve 313 can also be integrally formed. As another solution, the separator 31 can also be a separation coating provided on the inner wall of the connector 2, and the separation coating can isolate water from the connector 2.

[0075] The above description is only 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. An automatic backwashing pre-filter, comprising a filter cup (1), a connector (2), a filter element (3) and a control component (4), characterized in that: The filter cup (1) is connected to the connector (2). The connector (2) is provided with a water inlet channel (5) and a water outlet channel (6). A raw water chamber (7) is arranged in the filter cup (1). The water inlet channel (5) is communicated with the raw water chamber (7) through a water passing port (9). The filter cup (1) is provided with a sewage discharge port (10), and the sewage discharge port (10) is communicated with the raw water chamber (7). The control component (4) can open or close the sewage discharge port (10); A purified water chamber (11) is arranged in the filter element (3). The water outlet channel (6) is communicated with the purified water chamber (11). The filter element (3) is provided with a conversion hole (12). A shielding member (13) is slidably arranged on the filter element (3). The shielding member (13) includes a shielding block (131) and a shielding convex block (132). The outer side wall of the shielding block (131) extends outward to form the shielding convex block (132). The shielding block (131) can cover the conversion hole (12). Water flow can act on the shielding member (13) to make the shielding convex block (132) slide and block the water passing port (9). The conversion hole (12) communicates the water inlet channel (5) with the purified water chamber (11). A reset member (14) capable of resetting the shielding member (13) is arranged on the filter element (3); Wherein, a through hole (15) is formed in the shielding block (131). The filter element (3) passes through the through hole (15), and the shielding block (131) is slidably connected to the filter element (3); The water passing port (9) is formed in the filter cup (1); Alternatively, the water passing port (9) is formed in a partition plate (8), and the partition plate (8) is arranged between the filter cup (1) and the connector (2).

2. The automatic backwashing pre-filter according to claim 1, characterized in that: The reset member (14) includes a spring (141). The spring (141) is sleeved on the outer side wall of the filter element (3). A flange (16) is formed by the outer side wall of the filter element (3) extending outward. One end of the spring (141) abuts against the lower end surface of the shielding member (13), and the other end of the spring (141) abuts against the upper end surface of the flange (16).

3. The automatic backwashing pre-filter according to claim 1, characterized in that: The reset member (14) includes a magnet one (142) and a magnet two (143). The magnet one (142) is installed on the filter element (3), and the magnet two (143) is installed on the shielding member (13). The magnet one (142) and the magnet two (143) are magnetically repulsive. The cooperation of the magnet one (142) and the magnet two (143) can make the shielding member (13) cover the conversion hole (12).

4. The automatic backwashing pre-filter according to claim 1, wherein: The reset member (14) includes a magnet three (144) and a magnet four (145). The magnet three (144) is installed on the shielding member (13), and the magnet four (145) is installed on the connector (2). The magnet three (144) and the magnet four (145) are magnetically attractive. The cooperation of the magnet three (144) and the magnet four (145) can make the shielding member (13) cover the conversion hole (12).

5. The automatic backwashing pre-filter according to claim 1, wherein: The reset member (14) includes magnet five (146), magnet six (147), and magnet seven (148). Magnet five (146) is installed on the filter element (3), magnet six (147) is installed on the shielding member (13), and magnet seven (148) is installed on the joint (2). Magnet five (146) and magnet six (147) repel each other magnetically, magnet six (147) and magnet seven (148) attract each other magnetically. Magnet five (146), magnet six (147), and magnet seven (148) cooperate to enable the shielding member (13) to cover the conversion hole (12).

6. An automatic backwashing pre-filter according to any one of claims 1-5, characterized in that: A positioning box (17) is arranged in the raw water chamber (7). An impeller (18) is rotatably arranged in the positioning box (17). A rotating frame (19) is arranged in the raw water chamber (7). A diversion hole (20) is formed in the positioning box (17). Water flow can impact the impeller (18) through the diversion hole (20). The rotating frame (19) is connected to the impeller (18). The rotating frame (19) is located outside the filter element (3). A cleaning member (30) capable of cleaning the filter element (3) and / or the raw water chamber (7) is arranged on the rotating frame (19).

7. The automatic backwashing pre-filter according to claim 6, characterized in that: A connecting bolt (25) is arranged in the sewage outlet (10). A sewage discharge hole (26) capable of communicating the raw water chamber (7) with the outside is formed in the connecting bolt (25). The sewage discharge hole (26) can communicate with the raw water chamber (7). A groove (22) is formed in the lower end surface of the impeller (18). A central column (23) is connected to the connecting bolt (25). A pointed head (24) is arranged at the upper end of the central column (23). The pointed head (24) abuts against the bottom surface of the groove (22).

8. The automatic backwashing pre-filter according to claim 7, characterized in that: The control component (4) includes a sewage discharge valve (41). The sewage discharge valve (41) is connected to the connecting bolt (25). The sewage discharge valve (41) can control the opening or closing of the sewage discharge hole (26).

9. An automatic backwashing pre-filter according to any one of claims 1-5, characterized in that: A limiting ring (21) is connected to the outer side wall of the filter element (3). The lower end surface of the limiting ring (21) can abut against the upper end surface of the shielding member (13).

10. An automatic backwashing pre-filter according to any one of claims 1-5, characterized in that: An intercepting net (28) capable of covering the conversion hole (12) is arranged in the joint (2).

11. An automatic backwashing pre-filter according to any one of claims 1-5, characterized in that: A protective shell (29) outside the filter cup (1), and the protective shell (29) can surround the filter cup (1).

12. An automatic backwashing pre-filter according to any one of claims 1-5, characterized in that: An isolating member (31) is arranged in the joint (2). The isolating member (31) can isolate water from the joint (2).

13. The automatic backwashing pre-filter according to claim 12, characterized in that: The isolating member (31) includes isolating pipe one (311), isolating pipe two (312), and an isolating sleeve (313). Isolating pipe one (311) is arranged in the water inlet flow channel (5). Isolating pipe one (311) can communicate with the water passing port (9). Isolating pipe two (312) is arranged in the water outlet flow channel (6). The isolating sleeve (313) is arranged in the joint (2). The isolating sleeve (313) can communicate the purified water chamber (11) with isolating pipe two (312).

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