Centrifugal pump bottom valve filtering structure and centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses a centrifugal pump bottom valve filtering structure and a centrifugal pump, the filtering structure is characterized by comprising a liquid inlet cylinder, a liquid outlet pipe, a liquid inlet pipe, a liquid outlet pipe, a liquid outlet pipe and a liquid outlet pipe, the liquid inlets are formed in the centrifugal cavity, a plurality of sleeves communicated with the liquid inlets are arranged in the liquid inlet cavity, the sleeves are divided into an upper group and a lower group, one group of sleeves is opened, and the other group of sleeves is closed; and along with the continuous work of the filtering piece, the backflushing component intermittently cleans the filtering piece. When the back flushing component is started, one set of sleeves are closed, the other set of sleeves are opened, liquid is conveyed to the filtering piece from the sleeves in the closed state, reverse flushing is carried out, and impurities on the surface of the filtering piece are effectively stripped. And after the filtering pieces in one group of sleeves are subjected to back-flushing cleaning, the other group of sleeves are switched to be cleaned. And continuous and efficient operation of the filtering system is ensured in an alternate working mode.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and particularly relates to a bottom valve filtering structure for a centrifugal pump and a centrifugal pump. Background Art

[0002] With the continuous advancement of the industrialization process, centrifugal pumps are widely used in various fields such as water treatment, petrochemical industry, water supply systems, and agricultural irrigation. As the core equipment for liquid transportation, centrifugal pumps have the advantages of large flow rate, high efficiency, and simple operation, and are widely used in many production and living scenarios. However, during long-term operation, centrifugal pumps are easily affected by substances such as impurities and sand in water, resulting in internal damage or failures of the pump body, reducing the working efficiency and service life of the pump.

[0003] A bottom valve is usually installed at the water inlet of a centrifugal pump to prevent the water flow from flowing back into the pump body after shutdown, and to avoid cavitation or damage inside the pump caused by reverse flow. However, traditional bottom valves often neglect the filtering effect on large particulate impurities in water, and these impurities will enter the pump body along with the water flow, causing wear to components such as impellers and seals, increasing the failure rate of the pump. Especially in some environments with high pollution or complex water quality, the impact of impurities on the pump is more obvious.

[0004] To effectively solve this problem, some existing technologies have begun to attempt to add a filtering function to the bottom valve structure, pre-treating the inlet water through a filter screen or a filtering device to intercept impurities in the water and protect the pump body from damage. However, such technologies still have certain defects, the filtering effect is not ideal, the filter screen is easily blocked or damaged, resulting in unstable operation of the pump, and may even affect the water absorption capacity of the pump. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a bottom valve filtering structure for a centrifugal pump and a centrifugal pump, aiming to alleviate the above problems to at least a certain extent.

[0006] The above technical object of the present invention is achieved through the following technical solutions: A filtering structure, comprising: A liquid inlet cylinder, which has a liquid inlet chamber and a centrifugal chamber, and a liquid outlet pipe is communicated with the centrifugal chamber; A plurality of liquid inlets opened on the centrifugal chamber, a plurality of sleeves communicated with the liquid inlets are arranged in the liquid inlet chamber, and the plurality of sleeves are divided into two upper and lower groups, one group of sleeves is open, and the other group of sleeves is closed; A filter cylinder arranged in the sleeve, a filter channel is arranged in the filter cylinder, a filter element is arranged in the filter channel, and the filter element is slidably connected in the filter channel; A backflush component disposed between the liquid inlet chamber and the sleeve for delivering the liquid in the sleeve to backflush and clean the filter element; A crushing component disposed inside the filter cartridge for crushing the objects intercepted by the filter element in the filter cartridge.

[0007] Preferably, the backflush component includes a limiting rod connected to the sleeve, a piston adapted to the inner wall of the sleeve is slidably connected to the limiting rod, one end of the filter cartridge is rotatably connected to a lead screw a, and the piston is threadedly connected to the lead screw a.

[0008] Preferably, the crushing component includes a crushing frame a rotatably connected inside the filter cartridge, a crushing frame b is provided inside the crushing frame a, and crushing blades are provided on both the crushing frame a and the crushing frame b.

[0009] Preferably, the crushing component can operate synchronously when the backflush component performs its work; The crushing component further includes a rotating shaft rotatably connected to one end of the filter cartridge, the lead screw a is connected to the rotating shaft, a spring a is connected between the lead screw a and the filter cartridge, one end of the rotating shaft extends into the filter cartridge and is connected to a gear a, a gear b meshing with the gear a is rotatably connected inside the filter cartridge, a gear c meshing with the gear b is connected to the inner wall of the crushing frame a, and the crushing frame b is connected to the rotating shaft.

[0010] Preferably, blades are connected inside the crushing frame b.

[0011] Preferably, when the backflush component backflushes the filter elements in a group of sleeves, another group of sleeves is opened, and the filter elements in the two groups of sleeves are alternately backflushed with liquid in an intermittent manner; The backflush component further includes a limiting frame connected to the bottom of the liquid inlet chamber, two gears d are rotatably connected to the limiting frame, the rotating shaft in the upper group of sleeves corresponds to the upper gear d, the rotating shaft in the lower group of sleeves corresponds to the lower gear d, a gear e meshing with the gear d is connected to the rotating shaft, a guide cylinder is connected to the gear d, a plurality of guide chutes are provided on the outer wall of the guide cylinder, a guide frame cooperating with the guide chutes is slidably connected to the limiting frame, a lead screw b is rotatably connected to the limiting frame, a pushing boss slidably connected to the limiting frame is threadedly connected to the lead screw b, and the lead screw b is a reciprocating lead screw.

[0012] Preferably, a spring b is connected between the guide frame and the limiting frame.

[0013] Preferably, when the backflush component performs backflush cleaning on the filter element, it can move the position of the filter element, and the filter element slides along the filter channel towards the crushing component, pushing the substances in the filter channel towards the crushing component; The backflush component further includes a lead screw c rotatably connected to the sleeve. A threaded tube extending outside the sleeve is connected to the filter element. The threaded tube is threadedly connected to the lead screw c. A traction shaft is connected to the lead screw c. A traction rope is wound around the traction shaft. A plurality of guide rollers are rotatably connected to the outer wall of the sleeve. The traction rope bypasses the plurality of guide rollers and is connected to the piston. A spring c connected to the sleeve is connected to the bottom of the traction shaft.

[0014] Preferably, a motor a is connected to the limit frame, and a drive shaft of the motor a is connected to the lead screw b.

[0015] A centrifugal pump includes a filtering structure according to any one of the above, and further includes a mounting bracket. The liquid inlet cylinder is connected to the mounting bracket. A motor b is provided on the mounting bracket. A drive shaft of the motor b extends into the centrifugal chamber and is connected to an impeller.

[0016] In summary, the present invention mainly has the following beneficial effects: In the present invention, when the centrifugal pump is started, the motor a drives the impeller to rotate, generating negative pressure in the centrifugal chamber and sucking in liquid through the liquid inlet. The liquid first enters the filter cylinder through the liquid inlet. After passing through the filter element, the liquid enters the liquid inlet chamber along the sleeve path, is then sucked into the centrifugal chamber by the impeller, and finally discharged from the liquid outlet pipe. During this process, the filter element intercepts solid particles and impurities in the liquid, ensuring that the liquid entering the centrifugal chamber is relatively pure.

[0017] As the filter element continues to work, the backflush component intermittently cleans the filter element. When the backflush component is started, one group of sleeves closes, and the other group of sleeves opens. The liquid is conveyed from the closed sleeves to the filter element for reverse flushing, effectively peeling off the impurities on the surface of the filter element. After backflush cleaning the filter element in one group of sleeves, switch to the other group of sleeves for cleaning. By alternating work, the continuous and efficient operation of the filtering system is ensured. In this way, during the cleaning process, the other group of sleeves can still perform filtration, ensuring that the centrifugal pump does not interrupt the flow rate, thereby maintaining the stability of the system.

[0018] In addition, during the backflush cleaning process, the crushing components work synchronously to crush the solid impurities in the filter cartridge, capable of pulverizing larger particle impurities into smaller fragments, making it easier for them to be carried away by the backflush liquid, avoiding impurity accumulation in the filter channels, and reducing the risk of blockage. Moreover, when the backflush components clean the filter element, they can make the filter element slide along the filter channels, pushing the impurities towards the crushing components, especially for the long and slender impurities (such as dead branches, plastic sheets, etc.) accumulated in the filter channels. This combined method of pushing and crushing not only improves the processing ability for difficult-to-clean impurities but also enhances the stability and operating efficiency of the entire filtration system, ensuring that the filtration system of the centrifugal pump can maintain efficient operation during long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a sectional schematic diagram of the overall structure of the present invention; Figure 3 is a schematic diagram of the structure of the liquid inlet cylinder of the present invention; Figure 4 is a schematic diagram of the structure of the guiding cylinder of the present invention; Figure 5 is a sectional schematic diagram of the structure of the guiding cylinder of the present invention; Figure 6 is a schematic diagram of the structure of the guiding frame of the present invention; Figure 7 is a schematic diagram of the structure of the sleeve of the present invention; Figure 8 is a sectional schematic diagram of the structure of the sleeve of the present invention; Figure 9 is a schematic diagram of the structure of the crushing frame of the present invention; Figure 10 is a schematic diagram of the structure of the filter channel of the present invention.

[0020] Reference Signs: 100, liquid inlet cylinder; 101, liquid inlet chamber; 102, centrifugal chamber; 103, liquid outlet pipe; 104, liquid inlet port; 105, sleeve; 106, filter cartridge; 107, filter channel; 108, filter element; 109, mounting bracket; 110, motor b; 111, impeller; 200, limiting rod; 201, piston; 202, lead screw a; 203, crushing frame a; 204, crushing frame b; 205, crushing blade; 206, rotating shaft; 207, spring a; 208, gear a; 209, gear b; 210, gear c; 211, blade; 300. Limit frame; 301. Gear d; 302. Gear e; 303. Guide cylinder; 304. Guide chute; 305. Guide frame; 306. Lead screw b; 307. Pushing boss; 308. Spring b; 309. Motor a; 400. Lead screw c; 401. Threaded tube; 402. Traction shaft; 403. Traction rope; 404. Guide roller; 405. Spring c. Detailed implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Refer to Figures 1-10 , a filtering structure, comprising: Liquid inlet cylinder 100, the liquid inlet cylinder 100 has a liquid inlet cavity 101 and a centrifugal cavity 102, and a liquid outlet pipe 103 is communicated with the centrifugal cavity 102; A plurality of liquid inlet ports 104 opened on the centrifugal cavity 102, a plurality of sleeves 105 communicated with the liquid inlet ports 104 are arranged in the liquid inlet cavity 101, the plurality of sleeves 105 are divided into upper and lower groups, one group of sleeves 105 is opened, and the other group of sleeves 105 is closed; A filter cylinder 106 arranged in the sleeve 105, a filter channel 107 is arranged in the filter cylinder 106, a filter element 108 is arranged in the filter channel 107, and the filter element 108 is slidably connected in the filter channel 107; A backwashing component arranged between the liquid inlet cavity 101 and the sleeve 105, which is used to convey the liquid in the sleeve 105 to backwash and clean the filter element 108. When the backwashing component backwashes the filter element 108 in one group of sleeves 105, the other group of sleeves 105 is opened, and the filter elements 108 in the two groups of sleeves 105 are alternately backwashed with liquid in an intermittent manner; A crushing component arranged in the filter cylinder 106, which is used to crush the objects intercepted by the filter element 108 in the filter cylinder 106, and the crushing component can operate synchronously when the backwashing component performs its work; Wherein, when the backwashing component backwashes and cleans the filter element 108, it can move the position of the filter element 108, and the filter element 108 slides along the filter channel 107 towards the crushing component, pushing the substances in the filter channel 107 towards the crushing component; By setting up the centrifugal chamber 102, a negative pressure is generated inside the centrifugal chamber 102, and the liquid is sucked in through the liquid inlet 104. The liquid will enter the filter cartridge 106 through the liquid inlet 104, pass through the filter element 108, and enter the liquid inlet chamber 101 along the path of the sleeve 105. The negative pressure generated by the rotation of the impeller 111 can suck the liquid in the liquid inlet chamber 101 into the centrifugal chamber 102, and finally discharge it from the liquid outlet pipe 103. During this process, the filter element 108 intercepts solid particles and impurities in the liquid to ensure that the liquid entering the centrifugal chamber 102 is relatively pure. However, with the continuous operation of the filter element 108, due to the interception of the filter element 108, impurities will gradually accumulate on the surface of the filter element 108 and in the filter channel 107, affecting the filtration efficiency. For this reason, a backwashing component is set up to clean the filter element 108 in an intermittent manner. When the backwashing component is activated, one group of sleeves 105 will be closed, and the other group of sleeves 105 will be opened. The backwashing component can transport the liquid in the closed sleeve 105 to the filter element 108, and the liquid can reverse-flush the filter element 108 along the original path, effectively stripping the impurities adhering to the surface of the filter element 108. After backwashing and cleaning the filter element 108 in this group of sleeves 105, open this group of sleeves 105 and close the other group of sleeves 105 to backwash the filter element 108 in the other group of sleeves 105, so as to realize the alternating cleaning of the two groups of sleeves 105 and ensure the continuous and efficient operation of the filtration system. By setting two groups of sleeves 105 that work alternately, when one group of sleeves 105 is being backwashed and cleaned, the other group of sleeves 105 can still continue to filter, ensuring that the centrifugal pump will not have a flow interruption during the cleaning process and maintaining the continuous and stable operation of the filtration system. The backwashing component adopts an intermittent cleaning method, which can regularly reverse-flush the filter element 108, effectively stripping the impurities attached to the surface of the filter element 108, preventing blockage, ensuring that the filter element 108 maintains good filtration performance for a long time, and reducing the need for manual maintenance. Moreover, while the backwashing component backwashes the filter element 108 in one group of sleeves 105, the set crushing component can operate synchronously to crush the solid impurities in the filter cartridge 106. The operation of the crushing component can crush larger particles of impurities into smaller fragments, making them easier to be carried away by the backwashing liquid, avoiding the accumulation of impurities in the filter channel 107, and thus reducing the risk of blockage. In addition, when the backwashing component backwashes and cleans the filter element 108, it can move the position of the filter element 108, allowing the filter element 108 to slide along the filter channel 107 towards the crushing component, pushing the substances in the filter channel 107 towards the crushing component. For the solid impurities accumulated in the filter channel 107, such as long and thin sundries like dead branches, the pushing of the filter element 108 can effectively move these impurities along the filter channel 107, preventing them from staying in the filter channel 107. Especially when the backwashing liquid cannot effectively clean, long and thin or accumulated impurities (such as dead branches, plastic sheets, etc.) may have special shapes or be densely packed, resulting in the inability of the backwashing liquid to effectively wash and remove them.By using the pushing function of the filter element 108, these impurities can be gradually pushed towards the crushing component through physical movement, ensuring that they can be processed in a timely manner. The combination of pushing and the crushing component improves the processing ability of the filtration system for difficult-to-clean impurities, effectively improves the stability and operating efficiency of the entire system, and ensures that the centrifugal pump filtration system can operate efficiently for a long time.

[0023] As a further aspect of the present invention, the backwashing component includes a limiting rod 200 connected to the sleeve 105. A piston 201 adapted to the inner wall of the sleeve 105 is slidably connected to the limiting rod 200. One end of the filter cylinder 106 is rotatably connected to a lead screw a202, and the piston 201 is threadedly connected to the lead screw a202. By providing the lead screw a202, when backwashing and cleaning the filter element 108 in a set of sleeves 105, the lead screw a202 in this set of sleeves 105 can be rotated synchronously, so that the piston 201 slides along the limiting rod 200 and slides towards the filter cylinder 106, which can push the liquid to flow reversely and wash the filter element 108. This reverse flushing can effectively strip the solid impurities attached to the surface of the filter element 108, such as fine particles, sediments, etc., ensuring that the surface of the filter element 108 remains clean and restoring the filtration efficiency.

[0024] As a further aspect of the present invention, the crushing component includes a crushing frame a203 rotatably connected inside the filter cylinder 106. A crushing frame b204 is provided inside the crushing frame a203, and crushing blades 205 are provided on both the crushing frame a203 and the crushing frame b204. By providing the crushing frame a203 and the crushing frame b204, they can rotate inside the filter cylinder 106. With the rotation of the crushing frame b204 driving the rotation of the crushing frame a203, they rotate in opposite directions, and the crushing blades 205 can effectively crush the solid impurities accumulated in the filter channel 107. Through the relative movement of the crushing blades 205, the larger particle impurities are decomposed into smaller fragments, making them more easily carried away by the backwashing liquid, avoiding the accumulation and blockage of impurities.

[0025] As a further aspect of the present invention, the crushing component further includes a rotating shaft 206 rotatably connected to one end of the filter cylinder 106. The lead screw a202 is connected to the rotating shaft 206. A spring a207 is connected between the lead screw a202 and the filter cylinder 106. One end of the rotating shaft 206 extends into the filter cylinder 106 and is connected to a gear a208. A gear b209 meshing with the gear a208 is rotatably connected inside the filter cylinder 106. A gear c210 meshing with the gear b209 is connected to the inner wall of the crushing frame a203, and the crushing frame b204 is connected to the rotating shaft 206. By setting the rotating shaft 206, when backwashing the filter element 108 in one set of sleeves 105, the rotating shaft 206 can be rotated. The rotation of the rotating shaft 206 causes the lead screw a202 to rotate and move the position of the moving piston 201. At this time, this set of sleeves 105 is in a closed state, blocking the continuous entry of liquid and preventing the contaminated liquid generated during backwashing and crushing from entering the liquid inlet chamber 101. When the piston 201 moves, it can push a part of the liquid in the sleeve 105 to flow backward towards the filter element 108, achieving the purpose of backwashing and cleaning. In addition, when the rotating shaft 206 rotates, it can drive the crushing frame b204 in the filter cylinder 106 to rotate. When the crushing frame b204 rotates, it can make the crushing frame a203 rotate synchronously through the gear a208, gear b209 and gear c210, and further achieve the purpose of rotating the crushing frame a203 and the crushing frame b204 relatively to crush the sundries in the filter. Through the rotation of the rotating shaft 206, not only can the piston 201 be moved to achieve backwashing and cleaning, but also the rotation of the crushing frame can be driven synchronously, greatly improving the cleaning efficiency of the filtration system and thus enhancing the overall performance of the filtration system.

[0026] As a further solution of the present invention, blades 211 are connected inside the crushing frame b204; By setting the blades 211, the blades 211 rotate with the rotating shaft 206 and the crushing frame b204, which can effectively guide the water flow. Cooperating with the backwashing liquid flowing backward, it can effectively guide the sewage generated by crushing impurities to discharge from the liquid inlet cylinder 100.

[0027] As a further solution of the present invention, the backwashing component further includes a limiting frame 300 connected to the bottom of the liquid inlet chamber 101. Two gear d301 are rotatably connected to the limiting frame 300. The rotating shaft 206 in the upper set of sleeves 105 corresponds to the upper gear d301, and the rotating shaft 206 in the lower set of sleeves 105 corresponds to the lower gear d301. A gear e302 meshing with the gear d301 is connected to the rotating shaft 206. A guiding cylinder 303 is connected to the gear d301. A plurality of guiding chutes 304 are formed on the outer wall of the guiding cylinder 303. A guiding frame 305 cooperating with the guiding chutes 304 is slidably connected to the limiting frame 300. A lead screw b306 is rotatably connected to the limiting frame 300. A pushing boss 307 slidably connected to the limiting frame 300 is threadedly connected to the lead screw b306. The lead screw b306 is a reciprocating lead screw. A spring b308 is connected between the guiding frame 305 and the limiting frame 300; By setting the lead screw b306, when performing the backwashing operation, the lead screw b306 can be rotated. The rotation of the lead screw b306 can move the position of the pushing boss 307 up and down. When the pushing boss 307 moves into one of the upper guide cylinders 303, it can contact the guide frame 305 inside it, and the guide frame 305 can be driven to move as the pushing boss 307 moves. During the movement of the guide frame 305, since it is restricted by the limiting frame 300, it can only move linearly up and down. At this time, the guide frame 305 can rotate the guide cylinder 303 through the guide chute 304. When the upper guide cylinder 303 rotates, it can rotate a corresponding gear d301, and then the piston 201 on the upper set of sleeves 105 can be slid through the gear e302 and the rotating shaft 206, pushing the liquid to reverse-scour the filter element 108 in the upper set of sleeves 105 to achieve the purpose of backwashing and cleaning. At the same time, due to the reciprocating rotation of the lead screw b306, after the pushing boss 307 completes the pushing of the upper guide frame 305, it will continue to move downward. During this process, the corresponding spring b308 will be compressed to generate potential energy due to the upward movement of the previous guide frame 305. When the pushing boss 307 moves downward, the corresponding spring b308 releases the potential energy, which can reset the guide frame 305 to move and reset the corresponding guide cylinder 303 to rotate, so that the piston 201 gradually leaves the upper set of sleeves 105. When the pushing boss 307 enters the lower guide cylinder 303, it will also push the lower guide frame 305 to move linearly along the direction of the limiting frame 300, and drive the lower guide cylinder 303 to rotate through the guide chute 304. After the lower guide cylinder 303 rotates, it can drive the lower gear d301 to rotate, and further through the gear e302 and the rotating shaft 206, the piston 201 in the lower set of sleeves 105 can be slid to achieve the backwashing and cleaning of the lower filter element 108. Through the above design, the reciprocating movement of the lead screw b306 can alternately drive the backwashing and cleaning processes of the upper and lower sets of sleeves 105, enabling the entire filtration system to continuously clean without affecting the normal operation of the liquid inlet chamber 101. This intermittent and automated synchronous operation mechanism of backwashing and crushing not only improves the cleaning ability of the filtration system but also reduces the need for manual intervention, ensuring the long-term stable operation of the filter element 108.

[0028] As a further solution of the present invention, the backwashing component further includes a lead screw c400 rotatably connected to the sleeve 105. A threaded tube 401 extending outside the sleeve 105 is connected to the filter element 108. The threaded tube 401 is threadedly connected to the lead screw c400. A traction shaft 402 is connected to the lead screw c400. A traction rope 403 is wound around the traction shaft 402. A plurality of guide rollers 404 are rotatably connected to the outer wall of the sleeve 105. The traction rope 403 bypasses the plurality of guide rollers 404 and is connected to the piston 201. A spring c405 connected to the sleeve 105 is connected to the bottom of the traction shaft 402; By setting the towing rope 403, when the piston 201 moves to perform backwashing on the filter element 108, the towing rope 403 can be pulled, enabling the towing rope 403 to tow the towing shaft 402 to rotate. Furthermore, the lead screw c400 can be rotated to move the position of the threaded tube 401 and the filter element 108 through the acting force of the thread, allowing the filter element 108 to move along the filter channel 107 towards the crushing frame. Thus, during the process of the filter element 108 receiving backwashing, it can also move, cooperating with the backwashing liquid to push impurities towards the crushing component, achieving the purpose of efficient cleaning. In addition, the provided spring c405 can generate potential energy when twisted during the rotation of the towing shaft 402 and the lead screw c400. When the piston 201 returns to the origin subsequently, the lead screw c400 can rotate in reverse to wind up the towing rope 403 again and return the position of the filter element 108, facilitating the next cleaning cycle. Among them, the filter element 108 can be a filter screen, a filter element, or other porous filtering structures.

[0029] As a further solution of the present invention, a motor a309 is connected to the limiting frame 300, and the driving shaft of the motor a309 is connected to the lead screw b306. By setting the motor a309 and connecting its driving shaft to the lead screw b306, automatic driving of the lead screw b306 can be achieved, making the movement of the pushing boss 307 more accurate and efficient. By reasonably setting the operating parameters of the motor a309 and adjusting the movement speed of the pushing boss 307, the cleaning interval period for the filter element 108 in each group of filter cartridges 106 can be regulated.

[0030] A centrifugal pump includes a filtering structure according to any one of the above, and further includes a mounting bracket 109. The liquid inlet cylinder 100 is connected to the mounting bracket 109, and a motor b110 is provided on the mounting bracket 109. The driving shaft of the motor b110 extends into the centrifugal chamber 102 and is connected to an impeller 111.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A filtering structure, characterized in that: include: A liquid inlet cylinder, the liquid inlet cylinder having a liquid inlet cavity and a centrifugal cavity, the centrifugal cavity being connected with a liquid outlet pipe; A plurality of liquid inlets are provided on the centrifugal chamber, wherein the liquid inlet chamber is provided with a plurality of sleeves in communication with the liquid inlets, wherein the plurality of sleeves are divided into two groups, one group of sleeves is open and the other group of sleeves is closed; A filter cartridge is arranged in the sleeve, wherein a filter channel is arranged in the filter cartridge, a filter element is arranged in the filter channel, and the filter element is slidably connected in the filter channel; A backflushing component disposed between the liquid inlet cavity and the sleeve, used for conveying the liquid in the sleeve to backflush and clean the filter element; The crushing component arranged in the filter cartridge is used to crush the objects intercepted by the filter element in the filter cartridge.

2. A filtering structure according to claim 1, characterized in that: The recoil component comprises a limit rod connected to the sleeve, a piston adapted to the inner wall of the sleeve is slidably connected to the limit rod, one end of the filter cartridge is rotatably connected to a lead screw a, and the piston is threadedly connected to the lead screw a.

3. A filtering structure according to claim 2, characterized in that: The crushing component comprises a crushing frame a rotatably connected to the filter cartridge, a crushing frame b is arranged inside the crushing frame a, and crushing blades are arranged on both the crushing frame a and the crushing frame b.

4. A filtering structure according to claim 3, characterized in that: The crushing component can be operated synchronously when the recoil component performs work; The crushing component also includes a rotating shaft rotatably connected to one end of the filter cartridge, the screw a is connected to the rotating shaft, a spring a is connected between the screw a and the filter cartridge, one end of the rotating shaft extends into the filter cartridge and is connected to a gear a, a gear b meshing with the gear a is rotatably connected in the filter cartridge, a gear c meshing with the gear b is connected to the inner wall of the crushing frame a, and the crushing frame b is connected to the rotating shaft.

5. A filtering structure according to claim 3, characterized in that: The interior of the crushing frame b is connected with blades.

6. A filtering structure according to claim 4, characterized in that: When the backflushing component backflushes the filter elements in one set of sleeves, the other set of sleeves is opened, and the filter elements in the two sets of sleeves are backflushed with liquid alternately in an intermittent manner; The recoil component also includes a limit frame connected to the bottom of the liquid inlet chamber, and two gears d are rotatably connected to the limit frame. The rotating shaft in the upper group of sleeves corresponds to the upper gear d, and the rotating shaft in the lower group of sleeves corresponds to the lower gear d. The rotating shaft is connected to a gear e that meshes with the gear d, and the gear d is connected to a guide cylinder, and a plurality of guide grooves are provided on the outer wall of the guide cylinder. The limit frame is slidably connected to a guide frame that cooperates with the guide grooves, and the limit frame is rotatably connected to a screw b, and a push boss that is threadedly connected to the screw b and is slidably connected to the limit frame, and the screw b is a reciprocating screw.

7. A filtering structure according to claim 6, characterized in that: A spring b is connected between the guide frame and the limiting frame.

8. A filtering structure according to claim 2, characterized in that: When the backflushing component backflushes the filter element, the filter element can move the position of the filter element, and the filter element slides along the filter channel toward the crushing component, pushing the material in the filter channel toward the crushing component; The recoil component also includes a screw c rotatably connected to the sleeve, a threaded tube extending to the outside of the sleeve is connected to the filter element, the threaded tube is threadedly connected to the screw c, a traction shaft is connected to the screw c, a traction rope is wound on the traction shaft, a plurality of guide rollers are rotatably connected to the outer wall of the sleeve, the traction rope passes around the plurality of guide rollers and is connected to the piston, and a spring c connected to the sleeve is connected to the bottom of the traction shaft.

9. A filtering structure according to claim 6, characterized in that: The limiting frame is connected with a motor a, and the driving shaft of the motor a is connected with the lead screw b.

10. A centrifugal pump, characterized in that: It comprises a filtering structure as described in any one of claims 1 to 9, and also comprises a mounting bracket, to which a liquid inlet cylinder is connected, on which a motor b is provided, and a driving shaft of the motor b extends into a centrifugal chamber and is connected to an impeller.

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