A sewage pump

Abstract

This application relates to the field of pump bodies, and more particularly to a sewage pump, comprising a pump body, an impeller, and a cutting device. The pump body surface is provided with an inlet and an outlet spaced apart. The impeller is rotatably connected to the inner wall of the pump body. The cutting device includes a cutter disc connected to the inner wall of the pump body. Multiple cutting chambers for impurities to pass through are spaced apart on the end face of the cutter disc. Multiple blades are spaced apart on the inner wall of each cutting chamber. The end face of the impeller blades that abuts against the cutter disc has a cutting surface. The inclination height of the cutting surface increases as the distance to the cutter disc decreases. When the impeller rotates, the cutting surface is tangential to the blades and shears the impurities within the cutting chambers. The arrangement of the cutter disc and blades in this application, with the cutting surface tangential to the cutter disc and shearing the impurities within the cutting chambers, achieves the shearing of impurities within the pump body. Sewage within the pump body, carrying the sheared impurities, is discharged from the outlet, preventing impurities from accumulating within the pump body. This achieves automated cleaning of impurities within the pump body, thereby improving the drainage efficiency of the sewage pump.

Description

Technical Field

[0001] This application relates to the field of pump bodies, and more particularly to a sewage pump. Background Technology

[0002] A sewage pump, also known as a wastewater pump, is a centrifugal pump specifically designed to transport contaminated water. It mainly consists of a pump body, impeller, bearings, and sealing devices. The pump body contains a motor that drives the impeller to rotate, allowing the liquid to obtain sufficient centrifugal force during rotation, thus enabling it to be discharged smoothly.

[0003] Wastewater often contains solid impurities. These solid impurities enter the pump body cavity through the pump inlet and accumulate inside the pump body cavity, hindering the impeller rotation and thus reducing the drainage efficiency of the wastewater pump. Summary of the Invention

[0004] In order to improve the drainage efficiency of sewage pumps, this application provides a sewage pump.

[0005] This application provides a sewage pump, which adopts the following technical solution:

[0006] A sewage pump includes a pump body, an impeller, and a cutting device. The pump body has an inlet and an outlet spaced apart on its surface, both of which are connected to the internal cavity of the pump body. The impeller is rotatably connected to the wall of the pump body cavity. The cutting device includes a cutter disc connected to the wall of the pump body cavity. The end face of the cutter disc has multiple cutting chambers spaced apart for impurities to pass through. Multiple blades are spaced apart on the inner wall of each cutting chamber. The end face of the impeller blade that abuts against the cutter disc has a cutting surface. The inclination height of the cutting surface increases as the distance to the cutter disc decreases. When the impeller rotates, the cutting surface is tangential to the blades and cuts up the impurities in the cutting chamber.

[0007] By adopting the above technical solution, when the sewage pump is in use, the impeller rotates in the pump body cavity, driving sewage carrying impurities into the pump body cavity through the inlet. The cutter disc is connected to the pump body cavity, and the impurities in the pump body cavity accumulate intermittently in the cutting chamber. During the rotation of the impeller, the cutting surface is tangent to the cutter disc and cuts the impurities in the cutting chamber, thereby cutting the impurities in the pump body cavity. The sewage in the pump body cavity carries the cut impurities and is discharged from the outlet, making it difficult for impurities to accumulate in the pump body cavity. This achieves automated cleaning of impurities in the pump body cavity, thereby improving the drainage efficiency of the sewage pump.

[0008] Optionally, the cutter head end face has a rotating cavity for the end of the impeller rotating shaft to be embedded, and the outer circumferential surface of the impeller rotating shaft abuts against the inner wall of the rotating cavity to form a limiting position.

[0009] By adopting the above technical solution, when the cutter head is installed on the inner wall of the pump body, the end of the impeller rotating shaft is embedded in the rotating cavity, and the outer circumferential surface of the impeller rotating shaft abuts against the inner wall of the rotating cavity to form a limit, thereby fixing both ends of the impeller axis and making it less likely for the impeller to deviate when rotating in the pump body cavity, thus improving the stability of the impeller rotating in the pump body cavity.

[0010] Optionally, the cutting device further includes a fixing component, which includes multiple fixing bolts. The end face of the cutter disc is provided with multiple threaded holes I for the ends of the fixing bolts to pass through. The inner wall of the pump body is provided with multiple threaded holes II for the ends of the fixing bolts to be embedded in. The ends of the fixing bolts pass through the threaded holes I and are threaded and tightened to the inner wall of the threaded holes II to form a fixation.

[0011] By adopting the above technical solution, when the cutter disc is embedded in the pump body cavity, and threaded hole one and threaded hole two correspond one-to-one and are connected, the fixing bolt corresponds one-to-one with threaded hole one, and the end of the fixing bolt passes through threaded hole one and is threaded and tightened to the inner wall of threaded hole two to form a fixation, thereby realizing the detachable connection between the cutter disc and the pump body, which facilitates the replacement and cleaning of the cutter disc, thereby improving the ease of use of the sewage pump.

[0012] Optionally, the fixing assembly further includes multiple sealing ring bladders, which are spaced apart and connected to the end face of the cutter head. Each sealing ring bladder corresponds to a threaded hole, the axis of the sealing ring bladder coincides with the axis of the threaded hole, and the inner wall of the sealing ring bladder can abut against the outer circumferential surface of the fixing bolt to form a seal.

[0013] By adopting the above technical solution, when the end of the fixing bolt passes through the threaded hole and is screwed into the inner wall of the threaded hole, the inner wall of the sealing ring abuts against the outer circumference of the fixing bolt to form a seal. This prevents water in the pump body cavity from easily entering the threaded hole through the contact point between the fixing bolt and the cutter head, ensuring that the fixing bolt is not easily corroded, thereby extending the service life of the sewage pump.

[0014] Optionally, the fixing assembly further includes multiple racks, multiple gears, and multiple clamping rings. The cutter head end face is provided with multiple fixing cavities spaced apart for the racks to slide in. The sliding direction of the racks is parallel to the axis of the threaded hole. Each fixing cavity corresponds to a sealing ring bladder, and the fixing cavity is located on the side of the sealing ring bladder closest to the threaded hole. The cutter head end face is provided with multiple clamping cavities spaced apart for the clamping rings to slide in. The sliding direction of the clamping rings is parallel to the sliding direction of the racks. Each clamping cavity corresponds to a threaded hole, and the clamping... The axis of the clamping cavity coincides with the axis of the threaded hole. The clamping cavity is connected to the fixed cavity. The gear is rotatably connected to the inner wall of the fixed cavity. The rack meshes with the gear. The gear is located between the rack and the clamping ring. The inner ring wall of the clamping ring has a tooth groove that meshes with the tooth surface of the gear. When the end face of the fixing bolt abuts against the end of the rack protruding from the cutter disc and drives the rack closer to the fixed cavity, the gear rotates, causing the clamping ring to slide away from the clamping cavity. The inner ring wall of the clamping ring and the outer circumference of the fixing bolt abut against both sides of the sealing ring bladder to form a seal.

[0015] By adopting the above technical solution, when the end of the fixing bolt passes through the threaded hole and is screwed into the inner wall of the threaded hole, the end face of the fixing bolt abuts against the end face of the rack protruding from the cutter disc and drives the rack closer to the fixing cavity. The end face of the rack is flush with the end face of the cutter disc. At the same time, the rack meshes with the gear, driving the gear to rotate. The inner wall of the tooth groove meshes with the gear tooth surface, driving the clamping ring to slide away from the cutter disc along the inner wall of the clamping cavity. The inner ring wall of the clamping ring protruding from the cutter disc and the outer circumference of the fixing bolt abut against both sides of the clamping ring bladder to form a seal, further improving the sealing stability between the inner ring wall of the clamping ring bladder and the outer circumference of the fixing bolt.

[0016] Optionally, the fixing assembly further includes a plurality of elastic elements, each corresponding to a rack. One end of the elastic element in the elastic direction is connected to the bottom wall of the fixing cavity, and the other end of the elastic element in the elastic direction is connected to the end face of the rack. The elastic element has the elastic force to drive the rack to slide away from the fixing cavity, and the end of the rack tends to protrude from the end face of the cutter head.

[0017] By adopting the above technical solution, when the fixing bolt is loosened, the pressure of the fixing bolt on the rack disappears, and the elastic force of the elastic element drives the rack to slide along the inner wall of the fixing cavity away from the cutter head. The end of the rack protrudes from the end face of the cutter head. There is no need for the operator to adjust the position of the rack on the inner wall of the fixing cavity, thus realizing the automatic reset of the rack and improving the ease of use of the sewage pump.

[0018] Optionally, the fixing assembly further includes multiple limiting rods and multiple elastic elements II. The limiting rods are rotatably connected to the end face of the clamping ring away from the cutter head. The elastic elements II correspond one-to-one with the limiting rods. One end of the elastic element II in the elastic direction is connected to the rotating shaft of the limiting rod, and the other end of the elastic element II in the elastic direction is connected to the end face of the clamping ring. The elastic element II has the elastic force to drive the limiting rod to rotate in a direction closer to the axis of the clamping ring, and the rod surface of the limiting rod and the surface of the cutter head clamp the end of the fixing bolt to form a limit.

[0019] By adopting the above technical solution, when the gear rotates and drives the clamping ring to slide away from the cutter head along the inner wall of the clamping cavity, the contact effect between the end face of the limiting rod and the inner wall of the clamping cavity disappears. The elastic force of the second elastic element drives the limiting rod to rotate towards the axis of the clamping ring. The limiting rod surface and the cutter head surface clamp the end of the fixing bolt to form a limit, making it difficult for the fixing bolt to deviate in the threaded hole, thereby improving the limiting stability of the cutter head in the inner wall of the pump body.

[0020] Optionally, the cutter head is connected to a buffer assembly, which includes multiple balls. The inner wall of the rotating cavity is coaxially provided with a buffer cavity for the multiple balls to be embedded in. The spherical surface of the balls makes rolling contact with the outer peripheral surface of the impeller rotating shaft.

[0021] By adopting the above technical solution, multiple balls are embedded in the buffer cavity, the inner wall of the buffer cavity abuts against the ball spherical surface to form a limit, and the ball spherical surface rolls in contact with the outer circumferential surface of the impeller rotating shaft. Rolling friction replaces sliding friction, reducing wear between the cutter head and the impeller, thereby extending the service life of the sewage pump.

[0022] Optionally, the buffer assembly further includes a buffer ring bladder, the outer ring wall of which is connected to the inner wall of the buffer cavity, the inner ring wall of which is in rolling contact with the spherical surface of the ball, and the inner cavity of the buffer ring bladder is connected to multiple fixed cavities. When the rack slides toward the fixed cavity, air in the fixed cavity enters the inner cavity of the buffer ring bladder, and the inner ring wall of the buffer ring bladder and the outer circumferential surface of the impeller shaft clamp the two ends of the ball to form a limit.

[0023] By adopting the above technical solution, when the end of the fixing bolt passes through the threaded hole and is screwed into the inner wall of the threaded hole, the end face of the fixing bolt abuts against the end face of the rack and drives the rack to slide towards the fixing cavity. The air pressure in the fixing cavity increases, the fixing cavity connects to the inner cavity of the buffer ring bladder, and the air in the fixing cavity enters the inner cavity of the buffer ring bladder. The inner ring wall of the buffer ring bladder is pressurized and expands, and the inner ring wall of the buffer ring bladder and the outer circumferential surface of the impeller rotating shaft clamp the two ends of the ball to form a limit, ensuring the stability of the rolling contact between the outer circumferential surface of the impeller rotating shaft and the spherical surface of the ball.

[0024] Optionally, the buffer assembly further includes a connecting rope and an opening / closing ring. The inner wall of the buffer cavity has an opening / closing cavity for the opening / closing ring to slide. The ball bearing is located between the opening / closing ring and the buffer ring bladder. When the opening / closing ring slides towards the buffer cavity, the end face of the opening / closing ring presses against the inner wall of the buffer cavity and closes the buffer cavity. The opening / closing cavity is connected to the pressing cavity. One end of the connecting rope is connected to the end face of the pressing ring, and the other end of the connecting rope is connected to the end face of the opening / closing ring. When the pressing ring moves away from the cutter head, the connecting rope receives the power of the pressing ring and drives the opening / closing ring away from the buffer cavity, and the sealing effect of the opening / closing ring on the buffer cavity disappears.

[0025] By adopting the above technical solution, the opening and closing ring slides along the inner wall of the opening and closing cavity towards the buffer cavity. The end face of the opening and closing ring presses against the inner wall of the buffer cavity and seals the buffer cavity, making the balls in the buffer cavity less susceptible to wear due to external factors, thereby ensuring the stability of the cutter head storage. When the end of the fixing bolt passes through the threaded hole and is screwed into the inner wall of the threaded hole, the clamping ring slides along the inner wall of the clamping cavity away from the cutter head. The connecting rope receives the power of the clamping ring and drives the opening and closing ring to slide along the inner wall of the opening and closing cavity away from the buffer cavity. The sealing effect of the opening and closing ring on the buffer cavity disappears, realizing the directional start of the buffer cavity.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The cutter head and blades are designed so that the cutting surface is tangent to the cutter head and cuts up the impurities in the cutting chamber, thereby cutting up the impurities in the pump body cavity. The sewage in the pump body cavity carries the cut impurities and is discharged from the outlet, making it difficult for impurities to accumulate in the pump body cavity. This achieves automatic cleaning of impurities in the pump body cavity, thereby improving the drainage efficiency of the sewage pump.

[0028] 2. The fixing bolts are designed so that the ends of the fixing bolts pass through the threaded holes and are screwed in to fix them to the inner wall of the threaded holes, thus achieving a detachable connection between the cutter head and the pump body. This facilitates the replacement and cleaning of the cutter head and improves the ease of use of the sewage pump.

[0029] 3. The fixing bolts are designed so that the ends of the fixing bolts pass through the threaded holes and are screwed in to fix them to the inner wall of the threaded holes, thus achieving a detachable connection between the cutter head and the pump body. This facilitates the replacement and cleaning of the cutter head and improves the ease of use of the sewage pump. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the overall structure in an embodiment of this application, mainly showing the cutting cavity.

[0032] Figure 3This is a partial cross-sectional view of an embodiment of this application, mainly showing the fixing component.

[0033] Figure 4 This is a schematic diagram of the overall structure of the limiting rod and the second elastic element in the embodiments of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Pump body; 11. Inlet; 12. Outlet; 13. Threaded hole two; 2. Impeller; 21. Cutting surface; 3. Cutting device; 31. Cutter disc; 311. Cutting chamber; 312. Rotating chamber; 313. Threaded hole one; 314. Fixed chamber; 315. Clamping chamber; 316. Buffer chamber; 317. Opening and closing chamber; 32. Fixed assembly; 321. Fixing bolt; 322. Sealing ring bladder; 323. Rack; 324. Gear; 325. Clamping ring; 3251. Gear groove; 326. Elastic element one; 327. Limiting rod; 328. Elastic element two; 4. Blade; 5. Buffer assembly; 51. Buffer ring bladder; 52. Opening and closing ring; 53. Elastic element three; 54. Connecting rope; 55. Ball bearing. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses a sewage pump. (Refer to...) Figure 1 and Figure 2 A sewage pump includes a pump body 1, an impeller 2, and a cutting device 3. The impeller 2 is rotatably connected to the inner wall of the pump body 1, and the axis of the impeller 2 coincides with the axis of the pump body 1. Multiple inlets 11 are spaced apart on the outer circumferential surface of the pump body 1, and the multiple inlets 11 are distributed around the axis of the pump body 1. All multiple inlets 11 are connected to the inner cavity of the pump body 1. An outlet 12 is opened on the surface of the pump body 1, and the outlet 12 is connected to the inner cavity of the pump body 1. When the impeller 2 rotates in the inner cavity of the pump body 1, sewage carries impurities from the inlets 11 into the inner cavity of the pump body 1 and is discharged from the outlet 12. The cutting device 3 is installed on the inner wall of the pump body 1. The cutting device 3 can cut the impurities accumulated in the inner cavity of the pump body 1, realize the crushing of impurities in the inner cavity of the pump body 1, and push the sewage in the inner cavity of the pump body 1 to carry the crushed impurities out of the outlet 12, so that impurities are not easy to accumulate in the inner cavity of the pump body 1, thereby realizing the automatic cleaning of impurities in the inner cavity of the pump body 1, thereby improving the drainage efficiency of the sewage pump.

[0037] Reference Figure 2 and Figure 3The cutting device 3 includes a cutter disc 31 and a fixing assembly 32. The fixing assembly 32 detachably fixes the cutter disc 31 to the inner wall of the pump body 1, realizing a detachable connection between the cutter disc 31 and the pump body 1, thereby facilitating the cleaning and replacement of the cutter disc 31. Multiple cutting chambers 311 are spaced apart on the end face of the cutter disc 31 to allow impurities to pass through. The cutting chambers 311 penetrate the outer wall of the cutter disc 31 in the depth direction and connect the inner cavity of the pump body 1 and the water inlet 11. Multiple blades 4 are spaced apart on the inner wall of the cutting chambers 311. The impeller 2 blades are positioned in conjunction with the cutter disc. The end face of the blade 31 is provided with a cutting surface 21. The inclination height of the cutting surface 21 increases as the distance to the blade 31 decreases. When the impeller 2 rotates, the cutting surface 21 is tangential to the blade 4 and cuts up the impurities in the cutting cavity 311, thereby reducing the volume of impurities entering the inner cavity of the pump body 1. This ensures the stability of the water in the inner cavity of the pump body 1 carrying the impurities out of the drain outlet, making it less likely for impurities to accumulate in the inner cavity of the pump body 1. This ensures the stability of the impeller 2 rotation and realizes the automatic cleaning of impurities in the inner cavity of the pump body 1, thereby improving the drainage efficiency of the sewage pump.

[0038] Reference Figure 2 and Figure 3 The cutter head 31 has a coaxially formed rotating cavity 312 for the end of the impeller 2 to be inserted. The axis of the rotating cavity 312 coincides with the axis of the impeller 2. The rotating cavity 312 passes through the end of the cutter head 31 along its own axis. The inner wall of the rotating cavity 312 abuts against the outer circumferential surface of the impeller 2 rotating shaft to form a limit, thereby limiting the two ends of the impeller 2 rotating shaft. This makes it less likely for the impeller 2 to deviate when rotating on the inner wall of the pump body 1, thus improving the stability of the impeller 2 rotating on the inner wall of the pump body 1.

[0039] Reference Figure 3 and Figure 4 The fixing assembly 32 includes multiple fixing bolts 321, multiple sealing rings 322, multiple racks 323, multiple gears 324, multiple clamping rings 325, multiple elastic elements 326, multiple limiting rods 327, and multiple elastic elements 328. The end face of the cutter head 31 has multiple threaded holes 313 for the ends of the fixing bolts 321 to pass through. The multiple threaded holes 313 are evenly distributed around the axis of the cutter head 31, and the axis of the threaded holes 313 is parallel to the axis of the pump body 1. 3. The cutter head 31 is inserted through the outer wall of the cutter head 31 along its own axis. The inner wall of the pump body 1 is provided with multiple threaded holes 13 for tightening the ends of the fixing bolts 321. When the cutter head 31 is embedded in the inner cavity of the pump body 1 and abuts against the inner wall of the pump body 1, the threaded holes 1 and 2 correspond one-to-one and are connected. The fixing bolts 321 correspond one-to-one with the threaded holes 1 and 313. The ends of the fixing bolts 321 pass through the threaded holes 1 and 313 and are tightened and fixed to the inner wall of the threaded holes 2 and 13, so as to realize the detachable connection between the cutter head 31 and the pump body 1.

[0040] Reference Figure 2 and Figure 3The sealing ring bladder 322 can be made of rubber or silicone. In this embodiment, the sealing ring bladder 322 is made of rubber, which has a certain deformation capability. Multiple sealing ring bladders 322 are connected at intervals around the axis of the cutter disc 31 on the end face of the cutter disc 31. Each sealing ring bladder 322 corresponds to a threaded hole 313, and the axis of the sealing ring bladder 322 coincides with the axis of the threaded hole 313. The inner wall of the sealing ring bladder 322 can press against the outer circumferential surface of the fixing bolt 321 to form a seal, so that water in the inner cavity of the pump body 1 is not easy to enter the threaded hole 313 from the contact point between the fixing bolt 321 and the cutter disc 31 and corrode the fixing bolt 321, thereby extending the service life of the sewage pump.

[0041] Reference Figure 2 and Figure 3 The cutter head 31 has multiple fixed cavities 314 spaced apart on its end face for sliding of the rack 323. The sliding direction of the rack 323 is parallel to the axis of the pump body 1. The fixed cavities 314 correspond one-to-one with the sealing ring bladder 322. The rack 323 is located between the sealing ring bladder 322 and the threaded hole 313. The elastic element 326 can be a compression spring or a tension spring. In this embodiment, the elastic element 326 is a compression spring with a certain deformation capacity. The elastic element 326 corresponds one-to-one with the rack 323. One end of the elastic element 326 in the elastic direction is connected to the bottom wall of the fixed cavity 314, and the other end of the elastic element 326 in the elastic direction is connected to the end face of the rack 323. The elastic element 326 has the elastic force to drive the rack 323 to slide away from the cutter head 31, and the end of the rack 323 protrudes from the surface of the cutter head 31.

[0042] Reference Figure 3 and Figure 4 The cutter head 31 has multiple abutment cavities 315 spaced apart on its end face for sliding abutment rings 325. Each abutment cavity 315 corresponds to a sealing ring bladder 322. The sliding direction of the abutment rings 325 coincides with the axis of the sealing ring bladder 322. The abutment cavities 315 are connected to the fixed cavity 314. A gear 324 is rotatably connected to the inner wall of the fixed cavity 314. The gear 324 is located between the rack 323 and the abutment rings 325. The rack 323 meshes with the gear 324. The inner ring wall of the abutment rings 325 has tooth grooves 3251 that mesh with the tooth surface of the gear 324. Each limiting rod 327 corresponds to abutment ring 325. The end of the limiting rod 327 is rotatably connected to the end face of the clamping ring 325 away from the cutter head 31. The rotation axis of the limiting rod 327 and the axis of the gear 324 are parallel to each other. The elastic element 328 can be a tension spring or a torsion spring. In this embodiment, the elastic element 328 is a torsion spring, which has a certain deformation capacity. One end of the elastic element 328 in the direction of elastic force is connected to the rotation axis of the limiting rod 327, and the other end of the elastic element 328 in the direction of elastic force is connected to the end face of the clamping ring 325. The elastic element 328 has the tendency to drive the limiting rod 327 to rotate in a direction closer to the axis of the clamping ring 325.

[0043] Reference Figure 3 and Figure 4 When the end of the fixing bolt 321 passes through the threaded hole 313 and is screwed into the inner wall of the threaded hole 13, the end face of the fixing bolt 321 abuts against the end face of the rack 323 protruding from the cutter head 31 and drives the rack 323 to slide along the inner wall of the fixing cavity 314 toward the cutter head 31. The end face of the rack 323 is flush with the end face of the cutter head 31. The gear 324 rotates, driving the clamping ring 325 to slide along the inner wall of the clamping cavity 315 away from the cutter head 31. The inner wall of the clamping ring 325 and the outer circumference of the fixing bolt 321 clamp the sealing ring 32. 2. Limiting is formed on both sides, further improving the sealing performance between the inner wall of the sealing ring 322 and the outer circumferential surface of the fixing bolt 321; at the same time, the end face of the clamping ring 325 is flush with the end face of the fixing bolt 321, and the elastic force of the second elastic element 328 drives the limiting rod 327 to rotate in the direction close to the axis of the clamping ring 325. The rod surface of the limiting rod 327 and the surface of the cutter disc 31 clamp the end of the fixing bolt 321 to form a limit, so that the fixing bolt 321 is not easy to deflect in the threaded hole 313, thereby improving the limiting stability of the cutter disc 31 on the inner wall of the pump body 1.

[0044] Reference Figure 2 and Figure 3 The cutter head 31 is equipped with a buffer assembly 5, which can reduce the wear between the impeller 2 and the cutter head 31. The buffer assembly 5 includes a buffer ring 51, an opening and closing ring 52, an elastic element 53, multiple connecting ropes 54 and multiple balls 55. The inner wall of the rotating cavity 312 is coaxially provided with a buffer cavity 316 to accommodate multiple balls 55. The spherical surface of the balls 55 protruding from the inner wall of the rotating cavity makes rolling contact with the outer circumferential surface of the impeller 2's rotating shaft. Rolling friction replaces sliding friction, reducing the wear between the impeller 2 and the cutter head 31, thereby extending the service life of the sewage pump.

[0045] Reference Figure 2 and Figure 3 The material of the buffer ring bladder 51 can be rubber or silicone. In this embodiment, the material of the buffer ring bladder 51 is rubber, which has a certain deformation capability. The outer ring wall of the buffer ring bladder 51 is coaxially fixed to the inner wall of the buffer cavity 316. The inner ring wall of the buffer ring bladder 51 is in rolling contact with the spherical surface of the ball 55. The inner cavity of the buffer ring bladder 51 is connected to multiple fixed cavities 314. When the rack 323 approaches the cutter head 31 along the inner wall of the fixed cavity 314, the air pressure in the fixed cavity 314 increases. The fixed cavity 314 is connected to the inner cavity of the buffer ring bladder 51. The air in the fixed cavity 314 enters the inner cavity of the buffer ring bladder 51. The inner ring wall of the buffer ring bladder 51 is pressurized and expands, driving the ball 55 to approach the rotating cavity 312 along the inner wall of the buffer cavity 316. The spherical surface of the ball 55 protruding from the rotating cavity 312 is in rolling contact with the outer peripheral surface of the impeller 2 rotating shaft, thereby ensuring the stability of the rolling contact between the spherical surface of the ball 55 and the outer peripheral surface of the impeller 2 rotating shaft.

[0046] Reference Figure 2 and Figure 3 The inner wall of the buffer cavity 316 has an opening and closing cavity 317 for the sliding of the opening and closing ring 52. The axis of the opening and closing ring 52 coincides with the axis of the cutter head 31, and the sliding direction of the opening and closing ring 52 coincides with the axis of the cutter head 31. The opening and closing ring 52 is located on the side of the ball 55 near the rotating cavity 312. The elastic element 3 53 can be a compression spring or a tension spring. In this embodiment, the elastic element 3 53 is a compression spring with a certain deformation capacity. One end of the elastic element 3 53 in the direction of elastic force is connected to the bottom wall of the opening and closing cavity 317. The other end of the elastic element 3 53 in the elastic direction is connected to the end face of the opening and closing ring 52. The elastic element 3 53 has the elastic force to drive the opening and closing ring 52 to slide along the opening and closing cavity 317 toward the direction close to the buffer cavity 316, and the end face of the opening and closing ring 52 tends to press against the inner wall of the buffer cavity 316 and close the buffer cavity 316, so that the ball 55 is stored in the buffer cavity 316, making it less likely for external factors to interfere with the ball 55 in the buffer cavity 316 and cause wear, thereby ensuring the stability of the cutter head 31 storage.

[0047] Reference Figure 2 and Figure 3 The opening and closing chamber 317 connects to multiple clamping chambers 315. A connecting rope 54 corresponds one-to-one with a clamping ring 325. One end of the connecting rope 54 is fixed to the end face of the clamping ring 325, and the other end is fixed to the end face of the opening and closing ring 52. The connecting rope 54 between the clamping ring 325 and the opening and closing ring 52 is in a taut state. When the clamping ring 325 slides along the inner wall of the clamping chamber 315 away from the cutter head 31, the connecting rope 54 receives the movement of the clamping ring 325. The force drives the opening and closing ring 52 to slide away from the buffer cavity 316 along the inner wall of the opening and closing cavity 317. The sealing effect of the opening and closing ring 52 on the buffer cavity 316 disappears. The inner wall of the buffer ring 51 squeezes the ball 55 and drives the ball 55 to slide closer to the rotating cavity 312 along the inner wall of the buffer cavity 316. The spherical surface of the ball 55 protruding from the rotating cavity 312 rolls into contact with the outer circumferential surface of the impeller 2 rotating shaft, thereby realizing the directional opening and closing of the buffer cavity 316.

[0048] The implementation principle of a sewage pump according to an embodiment of this application is as follows: When the sewage pump is running, it drives the impeller 2 to rotate, and the cutting surface 21 is tangent to the blade 4 and cuts up the impurities in the cutting cavity 311, thereby reducing the volume of impurities entering the inner cavity of the pump body 1. This ensures the stability of the water in the inner cavity of the pump body 1 carrying the impurities out of the drain outlet, making it less likely for impurities to accumulate in the inner cavity of the pump body 1, ensuring the stability of the impeller 2 rotation, and realizing the automatic cleaning of impurities in the inner cavity of the pump body 1, thereby improving the drainage efficiency of the sewage pump.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sewage pump characterised in that: The utility model provides a pump, including pump body (1), impeller (2) and cutting device (3), pump body (1) surface is equipped with water inlet (11) and water outlet (12) at intervals, water outlet (12) and water inlet (11) all communicate pump body (1) inner chamber, impeller (2) is rotatably connected in the inner chamber wall of pump body (1), cutting device (3) includes cutter head (31), cutter head (31) is connected in the inner chamber wall of pump body (1), the end surface of cutter head (31) is equipped with multiple cutting cavities (311) for impurity to pass through at intervals, the inner wall of cutting cavity (311) is connected with multiple blades (4) at intervals, the end surface of impeller (2) blade and cutter head (31) abuts and is equipped with cutting surface (21), the inclination height of cutting surface (21) increases with the distance to cutter head (31) reduction, when impeller (2) rotates, cutting surface (21) is tangent to blade (4) and cuts the impurity in cutting cavity (311) and shreds, The cutting device (3) further includes a fixing assembly (32), the fixing assembly (32) includes a plurality of fixing bolts (321), the end surface of the cutter head (31) is provided with a plurality of threaded holes (313) for the end of the fixing bolt (321) to pass through, the inner chamber wall of the pump body (1) is provided with a plurality of threaded holes (13) for the end of the fixing bolt (321) to be embedded, the end of the fixing bolt (321) is threaded through the threaded hole (313) and is screwed tightly in the inner wall of the threaded hole (13) to form a fixing; The fixing assembly (32) further includes a plurality of sealing ring capsules (322), a plurality of sealing ring capsules (322) are connected to the end surface of the cutter head (31) at intervals, the sealing ring capsule (322) corresponds to the threaded hole (313) one by one, the axis of the sealing ring capsule (322) coincides with the axis of the threaded hole (313), and the inner wall of the sealing ring capsule (322) can tightly abut the outer peripheral surface of the fixing bolt (321) to form a seal. The fixed assembly (32) further comprises a plurality of racks (323), a plurality of gears (324) and a plurality of abutting rings (325), the cutter head (31) is provided with a plurality of fixed cavities (314) for the sliding of the racks (323) at the end face and spaced apart, the sliding direction of the rack (323) and the axis of the threaded hole one (313) are parallel to each other, the fixed cavity (314) corresponds to the sealing ring capsule (322) one by one, the fixed cavity (314) is located on the side of the sealing ring capsule (322) close to the threaded hole one (313), the cutter head (31) is provided with a plurality of abutting cavities (315) for the sliding of the abutting ring (325) at the end face and spaced apart, the sliding direction of the abutting ring (325) and the sliding direction of the rack (323) are parallel to each other, the abutting cavity (315) corresponds to the threaded hole one (313) one by one, and the axis of the abutting cavity (315) and the axis of the threaded hole one (313) coincide, the abutting cavity (315) communicates with the fixed cavity (314), the gear (324) is rotationally connected to the inner wall of the fixed cavity (314), the rack (323) engages with the gear (324), the gear (324) is located between the rack (323) and the abutting ring (325), the inner wall of the abutting ring (325) is provided with a gear slot (3251) engaged with the gear surface of the gear (324), when the end surface of the fixed bolt (321) abuts against the end of the cutter head (31) protruding from the rack (323), and drives the rack (323) to approach the fixed cavity (314), the gear (324) rotates, drives the abutting ring (325) to slide away from the abutting cavity (315), and the inner wall of the abutting ring (325) and the outer peripheral surface of the fixed bolt (321) abut against the sealing ring capsule (322) on both sides to form a seal; The fixed assembly (32) further comprises a plurality of elastic members one (326), the elastic member one (326) corresponds to the rack (323) one by one, one end of the elastic force direction of the elastic member one (326) is connected to the bottom wall of the fixed cavity (314), the other end of the elastic force direction of the elastic member one (326) is connected to the end face of the rack (323), the elastic member one (326) has elastic force to drive the rack (323) to slide away from the fixed cavity (314), and the end of the rack (323) protrudes from the end face of the cutter head (31) in a tendency; The fixed assembly (32) further comprises a plurality of limiting rods (327) and a plurality of elastic members two (328), the limiting rod (327) is rotationally connected to the end face of the abutting ring (325) away from the cutter head (31), the elastic member two (328) corresponds to the limiting rod (327) one by one, one end of the elastic force direction of the elastic member two (328) is connected to the rotating shaft of the limiting rod (327), the other end of the elastic force direction of the elastic member two (328) is connected to the end face of the abutting ring (325), the elastic member two (328) has elastic force to drive the limiting rod (327) to rotate towards the axis of the abutting ring (325), and the rod surface of the limiting rod (327) and the surface of the cutter head (31) clamp the end of the fixed bolt (321) to form a limit.

2. A sewage pump according to claim 1, characterised in that: The cutter head (31) is provided with a rotating cavity (312) for embedding the end of the rotating shaft of the impeller (2), and the outer circumferential surface of the rotating shaft of the impeller (2) abuts the inner wall of the rotating cavity (312) to form a limit.

3. A sewage pump according to claim 2, wherein: The cutter head (31) is connected with a buffer assembly (5), the buffer assembly (5) comprises a plurality of balls (55), the inner wall of the rotating cavity (312) is coaxially provided with a buffer cavity (316) for embedding the plurality of balls (55), and the spherical surface of the ball (55) is in rolling contact with the outer circumferential surface of the rotating shaft of the impeller (2).

4. A sewage pump according to claim 3, wherein: The buffer assembly (5) further comprises a buffer ring capsule (51), the outer wall of the buffer ring capsule (51) is connected to the inner wall of the buffer cavity (316), the inner wall of the buffer ring capsule (51) is in rolling contact with the spherical surface of the ball (55), and the inner cavity of the buffer ring capsule (51) is communicated with a plurality of fixed cavities (314), when the rack (323) slides towards the fixed cavity (314), the air in the fixed cavity (314) enters the inner cavity of the buffer ring capsule (51), and the inner wall of the buffer ring capsule (51) and the outer circumferential surface of the rotating shaft of the impeller (2) clamp the two ends of the ball (55) to form a limit.

5. A sewage pump according to claim 4, wherein: The buffer assembly (5) further comprises a connecting rope (54) and an opening and closing ring (52), the inner wall of the buffer cavity (316) is provided with an opening and closing cavity (317) for sliding of the opening and closing ring (52), the ball (55) is located between the opening and closing ring (52) and the buffer ring capsule (51), when the opening and closing ring (52) slides towards the buffer cavity (316), the end surface of the opening and closing ring (52) abuts against the inner wall of the buffer cavity (316) and closes the buffer cavity (316), the opening and closing cavity (317) is communicated with the abutting cavity (315), one end of the connecting rope (54) is connected to the end surface of the abutting ring (325), the other end of the connecting rope (54) is connected to the end surface of the opening and closing ring (52), when the abutting ring (325) is away from the cutter head (31), the connecting rope (54) receives the power of the abutting ring (325) and drives the opening and closing ring (52) to be away from the buffer cavity (316), and the closing effect of the opening and closing ring (52) on the buffer cavity (316) disappears.

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