Permanent magnet type cutting pump for lifter

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a permanent magnet type cutting pump for a lifter. The cutting pump comprises a motor shell, a driving motor, a pump body, an impeller and a cutting assembly, the motor shell is arranged on the pump body, the driving motor is arranged in the motor shell, a motor shaft extends into the pump body to be connected with the impeller, the cutting assembly comprises a cutter head and a blade, the cutter head is provided with a cutting through hole, and a cutting part of the blade is provided with a cutting edge. The cutterhead is arranged at an inlet of the pump body, and the blade is arranged on the motor shaft and located on the outer side of the cutterhead. According to the cutting pump, when the motor shaft drives the blade to rotate at a high speed, the cutting edge of the blade and the notch of the cutting through hole of the cutter head form a scissor effect, and when sewage enters a pump cavity of the sewage pump through the cutting through hole of the cutter head, the blade is matched with the cutter head to bite and cut sundries such as films, rubber and plastics in the sewage; the sewage pump has a good crushing effect on sundries, so that the sewage pump cannot be blocked.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of sewage treatment, and in particular to a permanent magnet cutting pump for a lifter. Background Art

[0002] Domestic sewage from many business premises flows into underground collecting tanks through drainage pipes. The collecting tanks are integrated with sewage pumps, connecting pipes and control mechanisms to form a lifter (lifting mechanism). The sewage in the collecting tanks is lifted and pumped out by the sewage pump, so that the sewage is incorporated into the urban sewage network and then transported to the sewage treatment center for centralized treatment.

[0003] When the sewage level in the water collecting tank reaches the set height, the sewage pump starts automatically to lift and discharge the sewage. A one-way control valve is set on the outlet pipe to control the opening and closing of the pipe and prevent sewage from flowing back.

[0004] The inventors of the present application have discovered that domestic sewage is often mixed with debris such as films, rubber and plastic. Once these debris enter the sewage pump, it will clog the sewage pump, causing the sewage valve to fail to work properly and causing sewage overflow. Utility Model Content

[0005] The purpose of the utility model is to provide a permanent magnet cutting pump for a lifter to solve the problems in the above-mentioned background technology.

[0006] The embodiment of the utility model provides a permanent magnet cutting pump for a lifter, comprising: a motor housing, a drive motor, a pump body, an impeller and a cutting assembly;

[0007] The motor housing is arranged on the pump body;

[0008] The drive motor is a permanent magnet motor, which is arranged in the motor housing, and the motor shaft of the drive motor extends into the pump body;

[0009] The impeller is arranged on the motor shaft and is located in the pump cavity of the pump body;

[0010] The cutting assembly includes: a cutter disc and a blade;

[0011] The cutter head is provided with a through hole and a plurality of cutting through holes, and the plurality of cutting through holes are evenly distributed along the circumferential direction;

[0012] The cutting through hole forms a first opening and a second opening on both side end surfaces of the cutter disc, respectively, and the first opening is larger than the second opening;

[0013] The blade comprises: a mounting seat and a cutting portion;

[0014] The cutting portion is arranged on two opposite sides of the mounting seat, and the cutting portion is provided with an inclined blade;

[0015] The cutter head is arranged at the inlet of the pump body, and the through hole is used for the motor shaft to pass through;

[0016] The mounting seat sleeve is arranged on the motor shaft, located on one side of the second opening of the cutter disc and on the outside of the pump body. A gap is left between the blade and the cutter disc. The motor shaft is used to drive the blade to rotate. When the blade rotates, it cooperates with the cutter disc to cut and crush the debris passing through.

[0017] Based on the above scheme, it can be seen that the permanent magnet cutting pump for the lift of the present invention is provided with a motor housing, a drive motor, a pump body, an impeller and a cutting assembly. The motor housing is provided on the pump body, the drive motor is provided in the motor housing, the motor shaft of the drive motor extends into the pump body and is connected to the impeller, and the cutting assembly includes: a cutter disc and a blade, the cutter disc is provided with a through hole and a plurality of cutting through holes, the blade includes: a mounting seat and a cutting portion, the cutting portion is provided with a cutting edge, the cutter disc is provided at the inlet of the pump body, and the mounting seat sleeve is provided on the motor shaft and is located on the outside of the pump body. In the permanent magnet cutting pump for the lift of the present invention, the cutter disc is provided at the inlet of the pump body, and the blade is provided on the motor shaft of the drive motor. When the motor shaft drives the blade to rotate at high speed, the blade edge and the incision of the through hole cut by the cutter disc form a scissors effect. When sewage passes through the cutting hole of the cutter disc and enters the pump cavity of the sewage pump, the blade and the cutter disc cooperate to tear and cut the film, rubber, plastic and other debris in the sewage, which has a good crushing effect on the debris and will not be blocked in the sewage pump; the drive motor adopts a permanent magnet motor with high efficiency and can achieve multiple protections.

[0018] In a feasible solution, the cutting through hole is in a quadrilateral shape, including: a first side, a second side, a third side and a fourth side;

[0019] The first side and the third side are arc-shaped and extend radially, and the length of the first side is greater than the length of the third side;

[0020] The cutting through hole is provided with a plurality of protruding teeth at intervals on a first side edge on one side of the second opening.

[0021] In a feasible solution, the motor shaft is provided with an assembly thin section, and the assembly thin section is provided with a limiting plane;

[0022] The mounting seat is provided with a mounting through hole;

[0023] The mounting through hole is a stepped hole, the stepped small end of the mounting through hole is adapted to the assembly thin section for insertion of the assembly thin section, and the stepped large end of the mounting through hole is used for embedding the nut of the fixing bolt.

[0024] In a feasible solution, the assembly segment is provided with an annular groove, and the length of the assembly segment is greater than the length of the stepped small end of the mounting through hole.

[0025] In a feasible solution, the cutter disc is provided with a cutting groove on an end surface on one side of the second opening;

[0026] The cutting groove includes: a first cutting groove and a second cutting groove;

[0027] A plurality of the first cutting grooves are evenly distributed between the cutting through hole and the through hole, and are connected to the through hole;

[0028] A plurality of the second cutting grooves are evenly distributed on the outside of the cutting through holes, and each of the second cutting grooves is located between two adjacent cutting through holes.

[0029] In a feasible solution, the mounting seat is provided with a plurality of third cutting grooves on an end surface close to the cutter disc;

[0030] The third cutting groove corresponds to the position of the first cutting groove.

[0031] In a feasible solution, the inclination angle of the blade is 18±5°.

[0032] In a feasible solution, the cutter disc and the blade are made of alloy steel with a hardness of HRC58.

[0033] In a feasible solution, a handle is provided on the top of the motor housing.

[0034] In a feasible solution, it further includes: a connecting plate;

[0035] The connecting plate is L-shaped and is arranged on both sides of the pump body. The connecting plate is used for fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 Schematic diagram of a permanent magnetic cutting pump for a lifter in an embodiment of the present utility model;

[0038] Figure 2 In the embodiment of the present utility model Figure 1 A partial enlarged view of the

[0039] Figure 3 Schematic cross-sectional view of a permanent magnet cutting pump in an embodiment of the present utility model;

[0040] Figure 4 In the embodiment of the present utility model Figure 3 A magnified view of point A in FIG;

[0041] Figure 5 is a schematic diagram of a cutting assembly in an embodiment of the present utility model;

[0042] Figure 6 Schematic diagram of a cutter head in an embodiment of the present utility model;

[0043] Figure 7 This is a schematic diagram of the cutter head in another embodiment of the present invention from another angle;

[0044] Figure 8 A schematic diagram of a blade in an embodiment of the present utility model;

[0045] Figure 9 This is a schematic diagram of another angle of the blade in the embodiment of the present utility model;

[0046] Figure 10 It is a partial schematic diagram of the motor shaft in an embodiment of the present utility model.

[0047] Numbers in the figure:

[0048] 1. Motor housing; 11. Handle; 2. Drive motor; 21. Motor shaft; 211. Assembly segment; 212. Limiting plane; 213. Annular groove; 3. Pump body; 4. Impeller; 5. Cutting assembly; 51. Cutter disc; 511. Through hole; 512. Cutting through hole; 5121. First side; 5122. Second side; 5123. Third side; 5124. Fourth side; 513. Protruding tooth; 514. Cutting groove; 5141. First cutting groove; 5142. Second cutting groove; 52. Blade; 521. Mounting seat; 5211. Mounting through hole; 5212. Third cutting groove; 522. Cutting portion; 5221. Blade; 6. Connecting plate. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0052] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0053] As described in the background technology of this application, domestic sewage from many business premises flows into a water collection tank buried underground, and the sewage in the water collection tank is lifted and pumped out by a sewage pump of a lifter, so that the sewage is incorporated into the urban sewage network.

[0054] The inventors of the present application have discovered that domestic sewage is often mixed with debris such as films, rubber and plastic. Once these debris enter the sewage pump, it will clog the sewage pump, causing the sewage valve to fail to work properly and causing sewage overflow.

[0055] In order to solve the above problems, the inventors of this application have proposed the technical solution of this application, and the specific embodiments are as follows:

[0056] Figure 1 This is a schematic diagram of a permanent magnetic cutting pump for a lifter in an embodiment of the present utility model. Figure 2 In the embodiment of the present utility model Figure 1 A partial enlarged view of Figure 3 This is a cross-sectional schematic diagram of a permanent magnet cutting pump in an embodiment of the present utility model. Figure 4 In the embodiment of the present utility model Figure 3 The enlarged view of point A in Figure 5is a schematic diagram of a cutting assembly in an embodiment of the present invention, Figure 6 Schematic diagram of the cutter head in the embodiment of the present utility model, Figure 7 This is a schematic diagram of the cutter head in another embodiment of the present invention from another angle. Figure 8 Schematic diagram of a blade in an embodiment of the present invention, Figure 9 This is another angle diagram of the blade in the embodiment of the utility model. Figure 10 It is a partial schematic diagram of the motor shaft in an embodiment of the present utility model.

[0057] like Figures 1 to 10 As shown, the permanent magnet cutting pump for the lifter of this embodiment includes: a motor housing 1, a drive motor 2, a pump body 3, an impeller 4 and a cutting assembly 5.

[0058] The motor housing 1 is fixed to the top of the pump body 3 by bolts.

[0059] The drive motor 2 is a permanent magnet motor, which is arranged inside the motor housing 1. The motor shaft 21 of the drive motor 2 extends from the sealing end cover of the motor housing 1 and extends into the pump cavity of the pump body 3, and the bottom end of the motor shaft 21 extends out of the pump cavity of the pump body 3 from the inlet at the bottom end of the pump body 3.

[0060] The impeller 4 is fixedly mounted on the motor shaft 21 and is located in the pump cavity of the pump body 3 . The motor shaft 21 drives the impeller 4 to rotate.

[0061] The cutting assembly 5 includes a cutter disc 51 and a blade 52 .

[0062] A through hole 511 is provided at the center of the cutter head 51 .

[0063] The cutter disc 51 is provided with a plurality of cutting through holes 512 , and the plurality of cutting through holes 512 are evenly distributed along the circumferential direction.

[0064] Cutting hole 512 forms a first opening and a second opening on either side of the cutter disc 51, respectively. Cutting hole 512 is trumpet-shaped, with its sidewalls having a certain slope in the axial direction. This results in the openings formed by cutting hole 512 on either side of the cutter disc 51 being of different sizes, thereby allowing the edge of the smaller end of cutting hole 512 to form a sharp incision on the end surface of the cutter disc 51. For ease of description, the first opening formed by cutting hole 512 is defined as being larger than the second opening, i.e., the first opening is the larger end of cutting hole 512, and the second opening is the smaller end of cutting hole 512.

[0065] The blade 52 includes a mounting seat 521 and a cutting portion 522 .

[0066] The blade 52 is an integrated structure, with cutting portions 522 disposed on opposite sides of the mounting base 521. The cutting portion 522 of the blade 52 is provided with an inclined cutting edge 5221. The radial length of the cutting edge 5221 of the blade 52 is greater than the radial length of the cutting hole 512 of the cutter disc 51. When the blade 52 rotates, the cutting edge 5221 covers the area of ​​the cutting hole 512 of the cutter disc 51.

[0067] The cutter disc 51 is mounted on the pump body 3 at the inlet of the pump body 3. The bottom end of the motor shaft 21 passes through the through hole 511 of the cutter disc 51. The mounting seat 521 of the blade 52 is mounted on the motor shaft 21. The blade 52 is located on one side of the second opening of the cutter disc 51 and on the outside of the pump body 3 (away from the pump chamber). A slight gap is left between the end surface of the blade 52 and the end surface of the cutter disc 51.

[0068] In this embodiment, a cutterhead 51 is positioned at the inlet of the pump body 3, and blades 52 are mounted on the motor shaft 21 of the drive motor 2. The motor shaft 21 drives the blades 52 to rotate. As the blades 52 rotate, the cutting edges 5221 of the blades 52 and the cuts of the cutterhead 51 form a scissor-like effect. As sewage passes through the cutter holes 512 of the cutterhead 51 and enters the pump cavity, the blades 52 and cutterhead 51 cooperate to tear and cut debris such as film, rubber, and plastic in the sewage, effectively crushing the debris.

[0069] From the foregoing, it is readily apparent that the lifter-use permanent magnet cutting pump of this embodiment comprises a motor housing, a drive motor, a pump body, an impeller, and a cutting assembly. The motor housing is mounted on the pump body, the drive motor is mounted within the motor housing, and the motor shaft of the drive motor extends into the pump body and connects to the impeller. The cutting assembly comprises a cutter disc and a blade. The cutter disc is provided with a through hole and multiple cutting holes. The blade comprises a mounting seat and a cutting portion, the cutting portion having a cutting edge. The cutter disc is positioned at the inlet of the pump body, and the mounting seat is sleeved on the motor shaft and positioned outside the pump body. In this embodiment, the lifter-use permanent magnet cutting pump of this embodiment comprises a cutter disc positioned at the inlet of the pump body, and the blade is mounted on the motor shaft of the drive motor. When the motor shaft drives the blade to rotate, the blade's edge and the cutter disc's cut holes create a scissor effect. When sewage passes through the cutter disc's cut holes and enters the pump chamber of the sewage pump, the blade and the cutter disc cooperate to tear and cut debris such as film, rubber, and plastic in the sewage, effectively pulverizing the debris and preventing clogging of the sewage pump. The drive motor utilizes a permanent magnet motor, which is highly efficient and provides multiple protections.

[0070] Optional, such as Figure 5 、 Figure 6 and Figure 7As shown, the lifter in this embodiment uses a permanent magnet cutting pump, and the cutting hole 512 on the cutter disc 51 is roughly quadrilateral in shape. The cutting hole 512 includes: a first side 5121, a second side 5122, a third side 5123 and a fourth side 5124.

[0071] The first side 5121 and the third side 5123 are arc-shaped and extend roughly along the radial direction of the cutter disc 51. The length of the first side 5121 of the cutting hole 512 is greater than the length of the third side 5123. The second side 5122 is located on the side away from the center of the cutter disc 51.

[0072] A plurality of protruding teeth 513 are spaced apart on a first side 5121 of the cutting hole 512, on the second opening side (the side near the small end of the blade). The protruding teeth 513 form tooth-like sharp edges at the cut end of the blade disc 51, increasing the sharpness of the cut, thereby enhancing the pulverization effect on debris such as film and plastic.

[0073] Optional, such as Figure 4 、 Figure 8 、 Figure 10 As shown, in the embodiment of the lifter permanent magnet cutting pump, the end of the motor shaft 21 of the driving motor 2 is provided with an assembly segment 211, and the motor shaft 21 is provided with limiting planes 212 on two opposite sides of the assembly segment 211.

[0074] The mounting seat 521 of the blade 52 is provided with a mounting through hole 5211 .

[0075] The mounting through hole 5211 of the mounting seat 521 is a stepped hole. The stepped small end of the mounting through hole 5211 is adapted to the assembly thin section 211 of the motor shaft 21 and is also provided with a limiting plane.

[0076] The assembly segment 211 of the motor shaft 21 is inserted into the mounting hole 5211 of the mounting seat 521. The motor shaft 21 and the mounting seat 521 are interference fit to form a fixed connection. The stepped large end of the mounting hole 5211 of the mounting seat 521 is used for the nut of the fixing bolt to be embedded.

[0077] Furthermore, in the lifter of this embodiment, a permanent magnet cutting pump is used, and the motor shaft 21 is provided with an annular groove 213 at the root of the assembly segment 211, and the length of the assembly segment 211 of the motor shaft 21 is greater than the length of the stepped small end of the mounting through hole 5211 of the mounting seat 521 of the blade 52.

[0078] The stepped small end of the mounting hole 5211 is sleeved on the assembly segment 211 of the motor shaft 21, and the mounting seat 521 can be axially moved on the assembly segment 211 of the motor shaft 21 to fine-tune the gap between the blade 52 and the cutter disc 51, thereby adapting to different working environments.

[0079] Optionally, the lifter in this embodiment uses a permanent magnet cutting pump, and the cutter disc 51 is provided with a cutting groove 514 on the end surface on the second opening side.

[0080] The cutting groove 514 includes a first cutting groove 5141 and a second cutting groove 5142 .

[0081] The first cutting groove 5141 and the second cutting groove 5142 extend approximately along the radial direction of the cutter disc 51 , and the extending directions of the first cutting groove 5141 and the second cutting groove 5142 form a certain angle with the diameter direction of the cutter disc 51 .

[0082] There are multiple first cutting grooves 5141 and multiple second cutting grooves 5142 .

[0083] The plurality of first cutting grooves 5141 are evenly distributed in the area between the through hole 511 and the cutting through hole 512 of the cutter disc 51 , and the inner ends of the first cutting grooves 5141 are connected to the through hole 511 of the cutter disc 51 .

[0084] The plurality of second cutting grooves 5142 are evenly distributed outside the cutting through holes 512 of the cutter head 51 , and each second cutting groove 5142 is located in the area between two adjacent cutting through holes 512 .

[0085] When the blade 52 rotates, the cutting edge 5221 of the blade 52 covers the second cutting groove 5142 area of ​​the cutter disc 51 , thereby increasing the cutting and tearing force between the blade 52 and the cutter disc 51 .

[0086] Further, such as Figure 9 As shown, the lifter in this embodiment uses a permanent magnet cutting pump, and the mounting seat 521 of the blade 52 is provided with a third cutting groove 5212 on the end surface close to the cutter disc 51.

[0087] There are multiple third cutting grooves 5212, which are located on the outer side of the circumference of the mounting seat 521 and are evenly distributed along the circumferential direction. In the diameter direction, the third cutting groove 5212 of the blade 52 corresponds to the position of the first cutting groove 5141 of the cutter disc 51.

[0088] When the blade rotates, the third cutting groove of the blade cooperates with the first cutting groove of the cutter disc, which has a high-efficiency grinding and tearing effect on the fibrous impurities in the sewage.

[0089] Optionally, the lifter in this embodiment uses a permanent magnet cutting pump, and the inclination angle (slope) of the cutting edge 5221 on the blade 52 is 18±5°.

[0090] Optionally, the lifter in this embodiment uses a permanent magnet cutting pump, and the cutter disc 51 and the blade 52 are both made of alloy steel, and the hardness after heat treatment is about HRC58.

[0091] Optionally, the lifter in this embodiment uses a permanent magnet cutting pump, and a handle 11 is provided on the top of the motor housing 1 to facilitate the transportation and movement of the cutting pump.

[0092] Furthermore, the permanent magnet cutting pump for the lifter in this embodiment further includes: a connecting plate 6.

[0093] The connecting plate 6 is L-shaped at a right angle and is provided with fixing through holes.

[0094] The connecting plate 6 is arranged on two opposite sides of the bottom end of the pump body 3. One side of the connecting plate 6 is fixed to the pump body 3 by screws, and the other side of the connecting plate 6 can be fixed by bolts or other connecting parts to facilitate the installation and fixation of the cutting pump.

[0095] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium.

[0096] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0097] In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permanent magnet cutting pump for a lifter, characterized in that: include: Motor housing, drive motor, pump body, impeller and cutting assembly; The motor housing is arranged on the pump body; The drive motor is a permanent magnet motor, which is arranged in the motor housing, and the motor shaft of the drive motor extends into the pump body; The impeller is arranged on the motor shaft and is located in the pump cavity of the pump body; The cutting assembly includes: a cutter disc and a blade; The cutter head is provided with a through hole and a plurality of cutting through holes, and the plurality of cutting through holes are evenly distributed along the circumferential direction; The cutting through hole forms a first opening and a second opening on both side end surfaces of the cutter disc, respectively, and the first opening is larger than the second opening; The blade comprises: a mounting seat and a cutting portion; The cutting portion is arranged on two opposite sides of the mounting seat, and the cutting portion is provided with an inclined blade; The cutter head is arranged at the inlet of the pump body, and the through hole is used for the motor shaft to pass through; The mounting seat sleeve is arranged on the motor shaft, located on one side of the second opening of the cutter disc and on the outside of the pump body. A gap is left between the blade and the cutter disc. The motor shaft is used to drive the blade to rotate. When the blade rotates, it cooperates with the cutter disc to cut and crush the debris passing through.

2. The permanent magnet cutting pump for lifter according to claim 1, characterized in that: The cutting through hole is in a quadrilateral shape, including: a first side, a second side, a third side and a fourth side; The first side and the third side are arc-shaped and extend radially, and the length of the first side is greater than the length of the third side; The cutting through hole is provided with a plurality of protruding teeth at intervals on a first side edge of one side of the second opening.

3. The permanent magnet cutting pump for lifter according to claim 1, characterized in that: The motor shaft is provided with an assembly thin section, and the assembly thin section is provided with a limiting plane; The mounting seat is provided with a mounting through hole; The mounting through hole is a stepped hole, the stepped small end of the mounting through hole is adapted to the assembly thin section for insertion of the assembly thin section, and the stepped large end of the mounting through hole is used for embedding the nut of the fixing bolt.

4. The permanent magnet cutting pump for lifter according to claim 3, characterized in that: The assembly thin section is provided with an annular groove, and the length of the assembly thin section is greater than the length of the stepped small end of the mounting through hole.

5. The permanent magnetic cutting pump for lifter according to claim 1, characterized in that: The cutter disc is provided with a cutting groove on an end surface on one side of the second opening; The cutting groove includes: a first cutting groove and a second cutting groove; A plurality of the first cutting grooves are evenly distributed between the cutting through hole and the through hole, and are connected to the through hole; A plurality of the second cutting grooves are evenly distributed on the outside of the cutting through holes, and each of the second cutting grooves is located between two adjacent cutting through holes.

6. The permanent magnet cutting pump for lifter according to claim 5, characterized in that: The mounting seat is provided with a plurality of third cutting grooves on the end surface close to the cutter disc; The third cutting groove corresponds to the position of the first cutting groove.

7. The permanent magnet cutting pump for lifter according to claim 1, characterized in that: The inclination angle of the blade is 18±5°.

8. The permanent magnet cutting pump for lifter according to claim 1, characterized in that: The cutter disc and blade are made of alloy steel with a hardness of HRC58.

9. The permanent magnet cutting pump for lifter according to claim 1, characterized in that: A handle is provided on the top of the motor housing.

10. The permanent magnetic cutting pump for lifter according to any one of claims 1 to 9, characterized in that: Also includes: connecting plate; The connecting plate is L-shaped and is arranged on both sides of the pump body. The connecting plate is used for fixing.

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