Sewage pump

Abstract

The invention relates to the field of pump bodies, in particular to a sewage pump which comprises a pump body, an impeller and a cutting device, a water inlet and a water outlet are formed in the surface of the pump body at intervals, the impeller is rotatably connected to the inner cavity wall of the pump body, the cutting device comprises a cutterhead, the cutterhead is connected to the inner cavity wall of the pump body, and a plurality of cutting cavities allowing impurities to penetrate through are formed in the end face of the cutterhead at intervals. A plurality of blades are connected to the inner wall of the cutting cavity at intervals, cutting faces are arranged on the end faces, abutting against the cutterhead, of the blades of the impeller, the inclination height of the cutting faces is increased along with shortening of the distance to the cutterhead, and when the impeller rotates, the cutting faces are tangent to the blades and shear impurities in the cutting cavity into pieces. The cutter head and the blades are arranged, the cutting face is tangent to the cutter head, impurities in the cutting cavity are cut into pieces, the impurities in the inner cavity of the pump body are cut into pieces, sewage in the inner cavity of the pump body carries the cut impurities to be discharged from the water outlet, the impurities are not prone to being accumulated in the inner cavity of the pump body, and automatic cleaning of the impurities in the inner cavity of the pump body is achieved; therefore, the drainage efficiency of the sewage pump is improved.

Description

Technical Field

[0001] The present application relates to the field of pump bodies, and more particularly to a sewage pump. Background Art

[0002] A sewage pump, also known as a sewage drainage pump, is a centrifugal pump specifically used to transport polluted water. The sewage pump mainly consists of components such as a pump body, an impeller, a bearing, and a sealing device. An electric motor is arranged inside the pump body, and the electric motor drives the impeller to rotate, enabling the liquid to obtain sufficient centrifugal force during rotation and thus be smoothly discharged.

[0003] Generally, sewage often contains solid impurities. The solid impurities enter the cavity of the pump body through the water inlet of the pump body, and the solid impurities accumulate in the cavity of the pump body, preventing the impeller from rotating, thereby reducing the drainage efficiency of the sewage pump. Summary of the Invention

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

[0005] A sewage pump provided by the present application adopts the following technical solutions: A sewage pump includes a pump body, an impeller, and a cutting device. The surface of the pump body is provided with a water inlet and a water outlet at intervals, and both the water outlet and the water inlet communicate with the inner cavity of the pump body. The impeller is rotatably connected to the inner cavity wall of the pump body. The cutting device includes a cutter head, and the cutter head is connected to the inner cavity wall of the pump body. The end face of the cutter head is provided with a plurality of cutting cavities for impurities to pass through at intervals. The inner wall of the cutting cavity is connected with a plurality of blades at intervals. The end face of the impeller blade in contact with the cutter head is provided with a cutting surface, and the inclined height of the cutting surface increases as the distance to the cutter head decreases. When the impeller rotates, the cutting surface is tangent to the blade and cuts and crushes the impurities in the cutting cavity.

[0006] By adopting the above technical solutions, when the sewage pump is in use, the impeller rotates in the inner cavity of the pump body, driving the sewage with impurities to enter the inner cavity of the pump body through the water inlet. The cutter head is connected to the inner cavity of the pump body, and the impurities in the inner cavity of the pump body are accumulated in the cutting cavity at intervals. During the rotation of the impeller, the cutting surface is tangent to the cutter head and cuts and crushes the impurities in the cutting cavity, realizing the cutting and crushing of the impurities in the inner cavity of the pump body. The sewage in the inner cavity of the pump body carries the cut and crushed impurities and is discharged from the water outlet, making it difficult for the impurities to accumulate in the inner cavity of the pump body, realizing the automatic cleaning of the impurities in the inner cavity of the pump body, and thus improving the drainage efficiency of the sewage pump.

[0007] Optionally, a rotation cavity for the end of the impeller rotation shaft to be embedded is provided on the end face of the cutter head, and the outer peripheral surface of the impeller rotation shaft abuts against the inner wall of the rotation cavity to form a limit.

[0008] By adopting the above technical solution, when the cutter head is installed on the inner wall of the pump body cavity, the end of the impeller rotating shaft is embedded in the rotating cavity, and the outer peripheral surface of the impeller rotating shaft abuts against the inner wall of the rotating cavity to form a limit, realizing the fixation of both ends in the axial direction of the impeller axis, making it difficult for the impeller to shift when rotating in the pump body cavity, thereby improving the stability of the impeller rotation in the pump body cavity.

[0009] Optionally, the cutting device further includes a fixing component, the fixing component includes a plurality of fixing bolts, a plurality of first threaded holes for the ends of the fixing bolts to pass through are spaced apart on the end face of the cutter head, and a plurality of second threaded holes for the ends of the fixing bolts to be embedded are spaced apart on the inner wall of the pump body cavity. The ends of the fixing bolts pass through the first threaded holes and are threadedly tightened and fixed on the inner wall of the second threaded holes to form a fixation.

[0010] By adopting the above technical solution, when the cutter head is embedded in the pump body cavity and the first threaded holes and the second threaded holes correspond to each other and are communicated, the fixing bolts correspond to the first threaded holes one by one, and the ends of the fixing bolts pass through the first threaded holes and are threadedly tightened and fixed on the inner wall of the second threaded holes to form a fixation, realizing the detachable connection between the cutter head and the pump body, facilitating the replacement and cleaning of the cutter head, and thereby improving the simplicity of using the sewage pump.

[0011] Optionally, the fixing component further includes a plurality of sealing ring sacs, and the plurality of sealing ring sacs are connected at intervals on the end face of the cutter head. The sealing ring sacs correspond to the first threaded holes one by one, the axes of the sealing ring sacs coincide with the axes of the first threaded holes, and the inner circumferential wall of the sealing ring sac can abut against the outer peripheral surface of the fixing bolt to form a seal.

[0012] By adopting the above technical solution, when the end of the fixing bolt passes through the first threaded hole and is threadedly tightened and fixed on the inner wall of the second threaded hole, the inner circumferential wall of the sealing ring sac abuts against the outer peripheral surface of the fixing bolt to form a seal, making it difficult for the water in the pump body cavity to enter the first threaded hole through the contact portion between the fixing bolt and the cutter head, ensuring that the fixing bolt is not easily corroded, and thereby extending the service life of the sewage pump.

[0013] Optionally, the fixing component further includes a plurality of racks, a plurality of gears and a plurality of pressing rings. A plurality of fixing cavities for the racks to slide are spaced apart on the end face of the cutter head. The sliding direction of the rack is parallel to the axis of the first threaded hole. The fixing cavities correspond to the sealing ring capsules one by one. The fixing cavities are located on the side of the sealing ring capsule close to the first threaded hole. A plurality of pressing cavities for the pressing rings to slide are spaced apart on the end face of the cutter head. The sliding direction of the pressing ring is parallel to the sliding direction of the rack. The pressing cavities correspond to the third threaded holes one by one, and the axis of the pressing cavity coincides with the axis of the first threaded hole. The pressing cavity communicates with the fixing cavity. The gear is rotatably connected to the inner wall of the fixing cavity. The rack meshes with the gear. The gear is located between the rack and the pressing ring. Tooth grooves meshing with the tooth surface of the gear are formed on the inner peripheral wall of the pressing ring. When the end face of the fixing bolt abuts against the end of the rack protruding from the cutter head and drives the rack to approach the fixing cavity, the gear rotates, driving the pressing ring to slide in a direction away from the pressing cavity. The inner peripheral wall of the pressing ring and the outer peripheral surface of the fixing bolt abut against both sides of the sealing ring capsule to form a seal.

[0014] By adopting the above technical solution, when the end of the fixing bolt passes through the first threaded hole and is screwed and fixed on the inner wall of the second threaded hole, the end face of the fixing bolt abuts against the end face of the rack protruding from the cutter head and drives the rack to approach the fixing cavity. The end face of the rack is flush with the end face of the cutter head. 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 tooth surface of the gear, driving the pressing ring to slide along the inner wall of the pressing cavity in a direction away from the cutter head. The inner peripheral wall of the pressing ring protruding from the cutter head and the outer peripheral surface of the fixing bolt abut against both sides of the pressing ring capsule to form a seal, further improving the sealing stability between the inner peripheral wall of the pressing ring capsule and the outer peripheral surface of the fixing bolt.

[0015] Optionally, the fixing component further includes a plurality of first elastic members, which correspond to the racks one by one. One end of the first elastic member in the direction of the elastic force is connected to the bottom wall of the fixing cavity, and the other end of the first elastic member in the direction of the elastic force is connected to the end face of the rack. The first elastic member has an elastic force to drive the rack to slide in a direction away from the fixing cavity, and the tendency for the end of the rack to protrude from the end face of the cutter head.

[0016] By adopting the above technical solution, when the fixing bolt is unscrewed, the pressure of the fixing bolt on the rack disappears. The elastic force of the first elastic member drives the rack to slide along the inner wall of the fixing cavity in a direction away from the cutter head, and the end of the rack protrudes from the end face of the cutter head. There is no need for the staff to adjust the position of the rack on the inner wall of the fixing cavity, realizing the automatic reset of the rack, thereby improving the simplicity of using the sewage pump.

[0017] Optionally, the fixing component further includes a plurality of limiting rods and a plurality of second elastic members. The limiting rods are rotatably connected to the end face of the pressing ring away from the cutter head. The second elastic members correspond to the limiting rods one by one. One end of the second elastic member in the direction of the elastic force is connected to the rotating shaft of the limiting rod, and the other end of the second elastic member in the direction of the elastic force is connected to the end face of the pressing ring. The second elastic member has an elastic force to drive the limiting rod to rotate towards the direction close to the axis of the pressing 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.

[0018] By adopting the above technical solution, when the gear rotates and drives the pressing ring to slide along the inner wall of the pressing cavity away from the cutter head, the abutting effect between the end face of the limiting rod and the inner wall of the pressing cavity disappears. The elastic force of the second elastic member drives the limiting rod to rotate towards the direction close to the axis of the pressing ring. 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, so that the fixing bolt is not easily offset in the first threaded hole, thereby improving the limiting stability of the cutter head on the inner wall of the pump body cavity.

[0019] Optionally, the cutter head is connected with a buffer component. The buffer component includes a plurality of balls. A buffer cavity for embedding a plurality of balls is coaxially opened on the inner wall of the rotating cavity. The spherical surface of the ball is in rolling contact with the outer peripheral surface of the impeller rotating shaft.

[0020] By adopting the above technical solution, a plurality of balls are embedded in the buffer cavity. The inner wall of the buffer cavity abuts against the spherical surface of the ball to form a limit, and the spherical surface of the ball is in rolling contact with the outer peripheral surface of the impeller rotating shaft. Rolling friction replaces sliding friction, reducing the wear between the cutter head and the impeller, thereby prolonging the service life of the sewage pump.

[0021] Optionally, the buffer component further includes a buffer ring bag. The outer wall of the buffer ring bag is connected to the inner wall of the buffer cavity. The inner wall of the buffer ring bag is in rolling contact with the spherical surface of the ball. The inner cavity of the buffer ring bag communicates with a plurality of fixed cavities. When the rack slides towards the direction close to the fixed cavity, the air in the fixed cavity enters the inner cavity of the buffer ring bag, and the inner wall of the buffer ring bag and the outer peripheral surface of the impeller rotating shaft clamp both ends of the ball to form a limit.

[0022] By adopting the above technical solution, when the end of the fixing bolt passes through the first threaded hole and is screwed and fixed on the inner wall of the second 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 direction close to the fixed cavity. The air pressure in the fixed cavity increases. The fixed cavity communicates with the inner cavity of the buffer ring bag, and the air in the fixed cavity enters the inner cavity of the buffer ring bag. The inner wall of the buffer ring bag expands under pressure, and the inner wall of the buffer ring bag and the outer peripheral surface of the impeller rotating shaft clamp both ends of the ball to form a limit, ensuring the stability of the rolling contact between the outer peripheral surface of the impeller rotating shaft and the spherical surface of the ball.

[0023] Optionally, the buffer assembly further includes a connecting rope and an opening / closing loop. An opening / closing cavity for the opening / closing loop to slide is formed in the inner wall of the buffer cavity. The ball is located between the opening / closing loop and the buffer ring capsule. When the opening / closing loop slides towards the buffer cavity, the end face of the opening / closing loop abuts against the inner wall of the buffer cavity and closes the buffer cavity. The opening / closing cavity communicates with the abutting cavity. One end of the connecting rope is connected to the end face of the abutting ring, and the other end of the connecting rope is connected to the end face of the opening / closing loop. When the abutting ring moves away from the cutter head, the connecting rope receives the power of the abutting ring and drives the opening / closing loop away from the buffer cavity, and the closing effect of the opening / closing loop on the buffer cavity disappears.

[0024] By adopting the above technical solution, the opening / closing loop slides along the inner wall of the opening / closing cavity towards the buffer cavity. The end face of the opening / closing loop abuts against the inner wall of the buffer cavity and closes the buffer cavity, so that the balls in the buffer cavity are not easily worn by external factors, thus ensuring the stability of the storage of the cutter head. When the end of the fixing bolt passes through the threaded hole and is screwed and fixed on the inner wall of the second threaded hole, the abutting ring slides along the inner wall of the abutting cavity away from the cutter head. The connecting rope receives the power of the abutting ring and drives the opening / closing loop to slide along the inner wall of the opening / closing cavity away from the buffer cavity, and the closing effect of the opening / closing loop on the buffer cavity disappears, realizing the directional activation of the buffer cavity.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of the cutter head and the blade, the cutting surface is tangent to the cutter head and cuts and crushes the impurities in the cutting cavity, realizing the crushing of the impurities in the inner cavity of the pump. The sewage in the inner cavity of the pump carries the crushed impurities and discharges from the water outlet, so that the impurities are not easily accumulated in the inner cavity of the pump, realizing the automatic cleaning of the impurities in the inner cavity of the pump, thereby improving the drainage efficiency of the sewage pump; 2. The setting of the fixing bolt, the end of the fixing bolt passes through the threaded hole and is screwed and fixed on the inner wall of the second threaded hole to form a fixation, realizing the detachable connection between the cutter head and the pump body, facilitating the replacement and cleaning of the cutter head, thereby improving the simplicity of using the sewage pump; 3. The setting of the fixing bolt, the end of the fixing bolt passes through the threaded hole and is screwed and fixed on the inner wall of the second threaded hole to form a fixation, realizing the detachable connection between the cutter head and the pump body, facilitating the replacement and cleaning of the cutter head, thereby improving the simplicity of using the sewage pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the overall structural schematic diagram in the embodiment of the present application.

[0027] Figure 2 is the overall structural schematic diagram in the embodiment of the present application, mainly showing the cutting cavity.

[0028] Figure 3 is the partial sectional view in the embodiment of the present application, mainly showing the fixing assembly.

[0029] Figure 4 It is a schematic diagram of the overall structure of the limiting rod and the second elastic member in the embodiment of the present application.

[0030] Explanation of reference numerals: 1. Pump body; 11. Water inlet; 12. Water outlet; 13. Second threaded hole; 2. Impeller; 21. Cutting surface; 3. Cutting device; 31. Cutter head; 311. Cutting cavity; 312. Rotating cavity; 313. First threaded hole; 314. Fixed cavity; 315. Tightening cavity; 316. Buffer cavity; 317. Opening and closing cavity; 32. Fixing component; 321. Fixing bolt; 322. Sealing ring capsule; 323. Rack; 324. Gear; 325. Tightening ring; 3251. Tooth groove; 326. First elastic member; 327. Limiting rod; 328. Second elastic member; 4. Blade; 5. Buffer component; 51. Buffer ring capsule; 52. Opening and closing ring; 53. Third elastic member; 54. Connecting rope; 55. Ball. Detailed implementation manners

[0031] The following will Figures 1-4 further describe the present application in detail.

[0032] An embodiment of the present application discloses a sewage pump. Referring 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 cavity wall of the pump body 1, and the axis of the impeller 2 coincides with the axis of the pump body 1. A plurality of water inlets 11 are spaced apart on the outer peripheral surface of the pump body 1, and the plurality of water inlets 11 are spaced apart around the axis of the pump body 1. The plurality of water inlets 11 are all communicated with the inner cavity of the pump body 1. A water outlet 12 is provided on the surface of the pump body 1, and the water outlet 12 is communicated with the inner cavity of the pump body 1. When the impeller 2 rotates in the inner cavity of the pump body 1, sewage drives impurities to enter the inner cavity of the pump body 1 from the water inlet 11 and be discharged from the water outlet 12. The cutting device 3 is installed on the inner cavity wall of the pump body 1, and the cutting device 3 can cut the impurities accumulated in the inner cavity of the pump body 1, realize the crushing of the impurities in the inner cavity of the pump body 1, and push the sewage in the inner cavity of the pump body 1 to drive the broken impurities to be discharged from the water outlet 12, so that the impurities are not easily accumulated in the inner cavity of the pump body 1, thereby realizing the automatic cleaning of the impurities in the inner cavity of the pump body 1, and thus improving the drainage efficiency of the sewage pump.

[0033] Referring to Figure 2 and Figure 3, the cutting device 3 includes a cutter head 31 and a fixing component 32. The fixing component 32 detachably fixes the cutter head 31 on the inner cavity wall of the pump body 1, realizing the detachable connection between the cutter head 31 and the pump body 1, thus facilitating the cleaning and replacement of the cutter head 31. A plurality of cutting cavities 311 for impurities to pass through are spaced apart on the end face of the cutter head 31. The cutting cavities 311 penetrate through the outer wall of the cutter head 31 in the depth direction. The cutting cavities 311 communicate with the inner cavity of the pump body 1 and the water inlet 11. A plurality of blades 4 are spaced apart on the inner wall of the cutting cavities 311. The end face of the blade 2 of the impeller 2 in contact with the cutter head 31 is provided with a cutting surface 21. The inclined height of the cutting surface 21 increases as the distance to the cutter head 31 decreases. When the impeller 2 rotates, the cutting surface 21 is tangent to the blade 4 and cuts up the impurities in the cutting cavity 311, reducing the volume of the impurities entering the inner cavity of the pump body 1, ensuring the stability of the water in the inner cavity of the pump body 1 driving the impurities to be discharged from the drain port, making it difficult for the impurities to accumulate in the inner cavity of the pump body 1, ensuring the stability of the rotation of the impeller 2, and realizing the automatic cleaning of the impurities in the inner cavity of the pump body 1, thereby improving the drainage efficiency of the sewage pump.

[0034] Refer to Figure 2 and Figure 3 , a rotating cavity 312 for the end part of the rotating shaft of the impeller 2 to be embedded is coaxially arranged on the end face of the cutter head 31. The axis of the rotating cavity 312 coincides with the axis of the impeller 2. The rotating cavity 312 penetrates through the end face of the cutter head 31 along its own axis. The inner wall of the rotating cavity 312 abuts against the outer peripheral surface of the rotating shaft of the impeller 2 to form a limit, realizing the limit of both ends of the rotating shaft of the impeller 2, so that the impeller 2 is not easily displaced when rotating on the inner cavity wall of the pump body 1, thereby improving the stability of the rotation of the impeller 2 on the inner cavity wall of the pump body 1.

[0035] Refer to Figure 3 and Figure 4 , the fixing component 32 includes a plurality of fixing bolts 321, a plurality of sealing ring capsules 322, a plurality of racks 323, a plurality of gears 324, a plurality of abutting rings 325, a plurality of first elastic members 326, a plurality of limiting rods 327 and a plurality of second elastic members 328. A plurality of first threaded holes 313 for the ends of the fixing bolts 321 to pass through are spaced apart on the end face of the cutter head 31. The plurality of first threaded holes 313 are evenly spaced around the axis of the cutter head 31. The axis of the first threaded holes 313 is parallel to the axis of the pump body 1. The first threaded holes 313 penetrate through the outer wall of the cutter head 31 along their own axes. A plurality of second threaded holes 13 for the ends of the fixing bolts 321 to be screwed tightly are spaced apart on the inner cavity wall of the pump body 1. When the cutter head 31 is embedded in the inner cavity of the pump body 1 and abuts against the inner cavity wall of the pump body 1, the first threaded holes 313 and the second threaded holes 13 correspond to each other and communicate. The fixing bolts 321 correspond to the first threaded holes 313 one by one. The ends of the fixing bolts 321 pass through the first threaded holes 313 and are screwed tightly and fixed on the inner wall of the second threaded holes 13, realizing the detachable connection between the cutter head 31 and the pump body 1.

[0036] Refer to Figure 2 and Figure 3, the material of the seal ring capsule 322 can be rubber or silica gel. In the embodiment of the present application, the material of the seal ring capsule 322 is rubber, which has a certain deformation ability; a plurality of seal ring capsules 322 are connected at intervals around the axis of the cutter head 31 on the end face of the cutter head 31. The seal ring capsules 322 correspond to the first threaded holes 313 one by one, and the axis of the seal ring capsule 322 coincides with the axis of the first threaded hole 313. The inner wall of the inner circle of the seal ring capsule 322 can abut against the outer peripheral surface of the fixing bolt 321 to form a seal, so that the water in the inner cavity of the pump body 1 is not easily introduced into the first threaded hole 313 from the contact position between the fixing bolt 321 and the cutter head 31 to corrode the fixing bolt 321, thereby extending the service life of the sewage pump.

[0037] Referring to Figure 2 and Figure 3 , a plurality of fixing cavities 314 for the rack 323 to slide are provided at intervals on the end face of the cutter head 31. The sliding direction of the rack 323 is parallel to the axis of the pump body 1. The fixing cavities 314 correspond to the seal ring capsules 322 one by one. The rack 323 is located between the seal ring capsule 322 and the first threaded hole 313; the first elastic member 326 can be a compression spring or a tension spring. In the embodiment of the present application, the first elastic member 326 is a compression spring, which has a certain deformation ability. The first elastic members 326 correspond to the racks 323 one by one. One end of the first elastic member 326 in the direction of its elastic force is connected to the bottom wall of the fixing cavity 314, and the other end of the first elastic member 326 in the direction of its elastic force is connected to the end face of the rack 323. The first elastic member 326 has an elastic force to drive the rack 323 to slide away from the cutter head 31, and the end of the rack 323 has a tendency to protrude from the surface of the cutter head 31.

[0038] Referring to Figure 3 and Figure 4 , a plurality of abutting cavities 315 for the abutting ring 325 to slide are provided at intervals on the end face of the cutter head 31. The abutting cavities 315 correspond to the seal ring capsules 322 one by one. The sliding direction of the abutting ring 325 coincides with the axis of the seal ring capsule 322. The abutting cavity 315 communicates with the fixing cavity 314. The gear 324 is rotatably connected to the inner wall of the fixing cavity 314. The gear 324 is located between the rack 323 and the abutting ring 325. The rack 323 meshes with the gear 324. A tooth groove 3251 meshing with the tooth surface of the gear 324 is provided on the inner wall of the inner circle of the abutting ring 325; the limiting rods 327 correspond to the abutting rings 325 one by one. The end of the limiting rod 327 is rotatably connected to the end face of the abutting ring 325 away from the cutter head 31. The rotation axis of the limiting rod 327 is parallel to the axis of the gear 324. The second elastic member 328 can be a tension spring or a torsion spring. In the embodiment of the present application, the second elastic member 328 is a torsion spring, which has a certain deformation ability. One end of the second elastic member 328 in the direction of its elastic force is connected to the rotation shaft of the limiting rod 327, and the other end of the second elastic member 328 in the direction of its elastic force is connected to the end face of the abutting ring 325. The second elastic member 328 has an elastic force to drive the limiting rod 327 to rotate towards the direction close to the axis of the abutting ring 325.

[0039] Referring toFigure 3 and Figure 4 When the end of the fixing bolt 321 passes through the first threaded hole 313 and is threadedly tightened and fixed on the inner wall of the second 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 fixed cavity 314 towards 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 tightening ring 325 to slide along the inner wall of the tightening cavity 315 away from the cutter head 31. The inner wall of the inner ring of the tightening ring 325 and the outer peripheral surface of the fixing bolt 321 clamp both sides of the sealing ring capsule 322 to form a limit, further improving the sealing performance between the inner wall of the sealing ring capsule 322 and the outer peripheral surface of the fixing bolt 321. At the same time, the end face of the tightening ring 325 is flush with the end face of the fixing bolt 321. The elastic force of the second elastic member 328 drives the limiting rod 327 to rotate towards the direction close to the axis of the tightening ring 325. The rod surface of the limiting rod 327 and the surface of the cutter head 31 clamp the end of the fixing bolt 321 to form a limit, making the fixing bolt 321 not prone to deflection in the first threaded hole 313, thereby improving the limiting stability of the cutter head 31 on the inner cavity wall of the pump body 1.

[0040] Refer to Figure 2 and Figure 3 As shown in FIGS. and, the cutter head 31 is provided with a buffer assembly 5. The buffer assembly 5 can reduce the wear between the impeller 2 and the cutter head 31. The buffer assembly 5 includes a buffer ring capsule 51, an opening and closing ring 52, a third elastic member 53, a plurality of connecting ropes 54 and a plurality of balls 55. The inner wall of the rotating cavity 312 is coaxially provided with a buffer cavity 316 for accommodating a plurality of balls 55, and the spherical surface of the balls 55 protruding from the inner wall of the rotating air cavity is in rolling contact with the outer peripheral surface of the rotating shaft of the impeller 2. Rolling friction replaces sliding friction, reducing the wear between the impeller 2 and the cutter head 31, thereby prolonging the service life of the sewage pump.

[0041] Refer to Figure 2 and Figure 3 As shown in FIGS. and, the material of the buffer ring capsule 51 can be rubber or silica gel. In the embodiment of the present application, the material of the buffer ring capsule 51 is rubber, which has a certain deformation ability. The outer wall of the buffer ring capsule 51 is coaxially fixed on 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 balls 55. The inner cavity of the buffer ring capsule 51 communicates with a plurality of 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 communicates with the inner cavity of the buffer ring capsule 51, and the air in the fixed cavity 314 enters the inner cavity of the buffer ring capsule 51. The inner wall of the buffer ring capsule 51 is pressurized and expanded, driving the balls 55 to approach the rotating cavity 312 along the inner wall of the buffer cavity 316. The spherical surface of the balls 55 protruding from the rotating cavity 312 is in rolling contact with the outer peripheral surface of the rotating shaft of the impeller 2, thereby ensuring the stability of the rolling contact between the spherical surface of the balls 55 and the outer peripheral surface of the rotating shaft of the impeller 2.

[0042] Refer to Figure 2 andFigure 3 On the inner wall of the buffer cavity 316, there is 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 close to the rotating cavity 312. The third elastic member 53 can be a compression spring or a tension spring. In the embodiment of the present application, the third elastic member 53 is a compression spring and has a certain deformation ability. One end in the direction of the elastic force of the third elastic member 53 is connected to the bottom wall of the opening and closing cavity 317, and the other end in the direction of the elastic force of the third elastic member 53 is connected to the end face of the opening and closing ring 52. The third elastic member 53 has an elastic force to drive the opening and closing ring 52 to slide along the opening and closing cavity 317 towards the direction close to the buffer cavity 316, and there is a tendency for the end face of the opening and closing ring 52 to press against the inner wall of the buffer cavity 316 and close the buffer cavity 316, so as to realize the accommodation of the ball 55 in the buffer cavity 316, making it difficult for external factors to interfere with the ball 55 in the buffer cavity 316 and cause wear, thereby ensuring the stability of the accommodation of the cutter head 31.

[0043] Refer to Figure 2 and Figure 3 The opening and closing cavity 317 communicates with a plurality of pressing cavities 315. The connecting ropes 54 correspond to the pressing rings 325 one by one. One end of the connecting rope 54 is fixed to the end face of the pressing ring 325, and the other end of the connecting rope 54 is fixed to the end face of the opening and closing ring 52. The connecting ropes 54 between the pressing rings 325 and the opening and closing ring 52 are in a taut state. When the pressing ring 325 slides along the inner wall of the pressing cavity 315 in the direction away from the cutter head 31, the connecting rope 54 receives the power of the pressing ring 325 and drives the opening and closing ring 52 to slide along the inner wall of the opening and closing cavity 317 in the direction away from the buffer cavity 316. The closing effect of the opening and closing ring 52 on the buffer cavity 316 disappears. The inner ring wall of the buffer ring bladder 51 squeezes the ball 55 and drives the ball 55 to slide along the inner wall of the buffer cavity 316 in the direction close to the rotating cavity 312. The spherical surface of the ball 55 protruding from the rotating cavity 312 rolls into contact with the outer peripheral surface of the rotating shaft of the impeller 2, thereby realizing the directional opening and closing of the buffer cavity 316.

[0044] The implementation principle of the sewage pump in the embodiment of the present application is as follows: When the sewage pump operates, it drives the impeller 2 to rotate. The cutting surface 21 is tangent to the blade 4 and shreds the impurities in the cutting cavity 311, reducing the volume of the impurities entering the inner cavity of the pump body 1, ensuring the stability of the water in the inner cavity of the pump body 1 driving the impurities to be discharged from the drain port, making it difficult for the impurities to accumulate in the inner cavity of the pump body 1, ensuring the stability of the rotation of the impeller 2, realizing the automatic cleaning of the impurities in the inner cavity of the pump body 1, and thus improving the drainage efficiency of the sewage pump.

[0045] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sewage pump, characterized in that: The invention comprises a pump body (1), an impeller (2) and a cutting device (3); a water inlet (11) and a water outlet (12) are provided on the surface of the pump body (1) at intervals; the water outlet (12) and the water inlet (11) are both connected to the inner cavity of the pump body (1); the impeller (2) is rotatably connected to the inner cavity wall of the pump body (1); the cutting device (3) comprises a blade disc (31); the blade disc (31) is connected to the inner cavity wall of the pump body (1); and the end surface of the blade disc (31) is spaced A plurality of cutting cavities (311) are provided for impurities to pass through, and a plurality of blades (4) are connected to the inner wall of the cutting cavity (311) at intervals. The end surface of the impeller (2) blades abutting against the cutter disc (31) is provided with a cutting surface (21), and the inclined height of the cutting surface (21) increases as the distance to the cutter disc (31) decreases. When the impeller (2) rotates, the cutting surface (21) is tangent to the blades (4) and cuts the impurities in the cutting cavity (311).

2. A sewage pump according to claim 1, characterized in that: The end surface of the blade disc (31) is provided with a rotating cavity (312) for the end of the rotating shaft of the impeller (2) to be embedded, and the outer peripheral surface of the rotating shaft of the impeller (2) abuts against the inner wall of the rotating cavity (312) to form a limit.

3. A sewage pump according to claim 2, characterized in that: The cutting device (3) further comprises a fixing assembly (32), wherein the fixing assembly (32) comprises a plurality of fixing bolts (321), the end surface of the cutter disc (31) is provided with a plurality of threaded holes (313) for the ends of the fixing bolts (321) to pass through, and the inner wall of the pump body (1) is provided with a plurality of threaded holes (13) for the ends of the fixing bolts (321) to be embedded, and the ends of the fixing bolts (321) pass through the threaded holes (313) and are screwed and fixed to the inner wall of the threaded holes (13) to form a fixation.

4. A sewage pump according to claim 3, characterized in that: The fixing assembly (32) further comprises a plurality of sealing ring bags (322), wherein the plurality of sealing ring bags (322) are connected to the end face of the cutter disc (31) at intervals, wherein the sealing ring bags (322) correspond to the threaded holes (313) one by one, wherein the axes of the sealing ring bags (322) coincide with the axes of the threaded holes (313), and the inner wall of the sealing ring bags (322) can be pressed against the outer peripheral surface of the fixing bolts (321) to form a seal.

5. A sewage pump according to claim 4, characterized in that: The fixing assembly (32) further comprises a plurality of racks (323), a plurality of gears (324) and a plurality of abutting rings (325); the end surface of the cutter disc (31) is provided with a plurality of fixing cavities (314) for the racks (323) to slide; the sliding direction of the racks (323) is parallel to the axis of the threaded hole (313); the fixing cavities (314) correspond one-to-one with the sealing ring capsule (322); the fixing cavities (314) are located on a side of the sealing ring capsule (322) close to the threaded hole (313); the end surface of the cutter disc (31) is provided with a plurality of abutting cavities (315) for the abutting rings (325) to slide; the sliding direction of the abutting rings (325) is parallel to the sliding direction of the racks (323); the abutting cavities (315) correspond one-to-one with the threaded hole (313); the axis of the abutting cavities (315) is parallel to the threaded hole (313); The axes of the two axes coincide with each other, the abutting cavity (315) is connected to the fixed cavity (314), the gear (324) is rotatably connected to the inner wall of the fixed cavity (314), the rack (323) meshes with the gear (324), the gear (324) is located between the rack (323) and the abutting ring (325), and the inner wall of the abutting ring (325) is provided with a tooth groove (3251) meshing with the tooth surface of the gear (324), When the end face of the fixing bolt (321) abuts against the end of the rack (323) protruding from the cutter disc (31) and drives the rack (323) close to the fixing cavity (314), the gear (324) rotates, driving the clamping ring (325) to slide in a direction away from the clamping cavity (315), and the inner ring wall of the clamping ring (325) and the outer peripheral surface of the fixing bolt (321) abut against both sides of the sealing ring bag (322) to form a seal.

6. A sewage pump according to claim 5, characterized in that: The fixing assembly (32) further comprises a plurality of elastic members (326), wherein the elastic members (326) correspond one to one with the racks (323), one end of the elastic member (326) in the elastic force direction is connected to the bottom wall of the fixing cavity (314), and the other end of the elastic member (326) in the elastic force direction is connected to the end face of the rack (323), and the elastic member (326) has an elastic force driving the rack (323) to slide in a direction away from the fixing cavity (314), and the end of the rack (323) has a tendency to protrude from the end face of the cutter disc (31).

7. A sewage pump according to claim 5, characterized in that: The fixing assembly (32) further comprises a plurality of limit rods (327) and a plurality of elastic members (328), wherein the limit rods (327) are rotatably connected to the end face of the clamping ring (325) away from the cutter disc (31), the elastic member (328) and the limit rod (327) correspond one to one, one end of the elastic member (328) in the elastic force direction is connected to the rotation axis of the limit rod (327), and the other end of the elastic member (328) in the elastic force direction is connected to the end face of the clamping ring (325), the elastic member (328) has an elastic force driving the limit rod (327) to rotate in a direction close to the axis of the clamping ring (325), and the rod face of the limit rod (327) and the surface of the cutter disc (31) clamp the end of the fixing bolt (321) to form a limit.

8. A sewage pump according to claim 5, characterized in that: The blade disc (31) is connected to a buffer assembly (5), the buffer assembly (5) comprising a plurality of balls (55), a buffer cavity (316) for embedding the plurality of balls (55) is coaxially formed on the inner wall of the rotating cavity (312), and the spherical surface of the balls (55) is in rolling contact with the outer peripheral surface of the rotating shaft of the impeller (2).

9. A sewage pump according to claim 8, characterized in that: The buffer assembly (5) further comprises a buffer ring capsule (51), the outer ring wall of the buffer ring capsule (51) being connected to the inner wall of the buffer cavity (316), the inner ring wall of the buffer ring capsule (51) being in rolling contact with the spherical surface of the ball (55), the inner cavity of the buffer ring capsule (51) being connected to a plurality of fixed cavities (314), when the rack (323) slides in a direction approaching the fixed cavity (314), the air in the fixed cavity (314) enters the inner cavity of the buffer ring capsule (51), and the inner ring wall of the buffer ring capsule (51) and the outer peripheral surface of the rotating shaft of the impeller (2) clamp the two ends of the ball (55) to form a limit.

10. A sewage pump according to claim 9, characterized in that: The buffer assembly (5) further comprises a connecting rope (54) and an opening and closing ring (52); an opening and closing cavity (317) for the opening and closing ring (52) to slide is provided on the inner wall of the buffer cavity (316); a ball (55) is located between the opening and closing ring (52) and the buffer ring bag (51); when the opening and closing ring (52) slides in a direction close to the buffer cavity (316), the end face 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 ring (52) is The cavity (317) is connected to the tightening cavity (315), one end of the connecting rope (54) is connected to the end face of the tightening ring (325), and the other end of the connecting rope (54) is connected to the end face of the opening and closing ring (52). When the tightening ring (325) moves away from the cutter disc (31), the connecting rope (54) receives the power of the tightening ring (325) and drives the opening and closing ring (52) away from the buffer cavity (316), and the sealing effect of the opening and closing ring (52) on the buffer cavity (316) disappears.

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