Drainage motor rotor and drainage motor including the rotor

Abstract

The present invention discloses a drainage motor rotor, including an impeller, a bearing assembly, a magnet injection molding assembly, a coupling injection molding assembly, an elastomer and an end cover; the magnet injection molding assembly includes a magnet and a clamping part injection-molded on the magnet, the magnet is arranged between a first clamping part and a second clamping part, a starting rib is provided in the accommodating cavity of the first clamping part, the elastomer and the coupling are sequentially placed in the accommodating cavity, the impeller is fixed on the first knurled part of the rotating shaft, the coupling is injection-molded on the second knurled part of the rotating shaft, the starting rib hits one of the passive surfaces of the elastomer in the accommodating cavity, and the other passive surface pushes the coupling shift block to drive the rotating shaft and the impeller to rotate. Since there is a problem in the market that the clamping part is easy to fall off or plastically deform from the magnet or the elastomer is broken under the dual influence of the impact force and high temperature during the rotor starting process, the drainage electronic rotor of the present invention effectively prolongs the service life of the rotor under the premise of ensuring the rotor starting performance; the present invention also discloses a drainage motor containing the above-mentioned drainage motor rotor.

Description

Technical Field

[0001] The invention relates to a drainage motor rotor and also to a drainage motor comprising the drainage motor rotor. Background Art

[0002] At present, the drainage motors on the market have a simple injection molding between the magnet and the clamping part, and the injection molding structure is simple. The inner end surface of the first clamping part and the second clamping part is a plane. The first clamping part and the second clamping part are connected by a connecting pipe passing through the center hole of the magnet, and the connecting pipe is a cylindrical sleeve. When the rotation angle of the impeller relative to the magnet injection molding assembly around the axis is greater than 330°, the joint between the first clamping part and the second clamping part and the magnet will be subjected to excessive starting impact force and moment of inertia, causing the rotor to fall off from the magnet or plastically deform under the dual influence of excessive impact force and high temperature working environment during the starting process, thereby affecting the service life of the rotor. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a drainage motor rotor which can effectively improve the injection molding bonding force between the magnet and the clamping part on the one hand, and effectively prevent the axial relative movement and radial relative rotation between the magnet and the clamping part on the other hand. Another purpose of the present invention is to provide a drainage motor containing the above-mentioned drainage motor rotor, which can greatly extend the service life of the drainage motor.

[0004] Technical solution: The drainage motor rotor described in the present invention includes a magnet injection molding component, which includes a magnet and a clamping part injection-molded according to the shape of the magnet; the clamping part includes a first clamping part, a second clamping part and a connecting pipe connecting the first clamping part and the second clamping part, the magnet has a center hole I for the connecting pipe to pass through, the magnet is sleeved on the connecting pipe and is clamped and fixed in the clamping part by the first clamping part and the second clamping part, the first clamping part is provided with at least two anti-rotation protrusions on the inner end face close to the second clamping part, the magnet is provided with an anti-rotation recess at the corresponding position of the anti-rotation protrusion on the first clamping part, when the magnet is sleeved on the connecting pipe, the anti-rotation protrusion on the inner end face of the first clamping part is embedded in the anti-rotation recess on the end face of the magnet and is matched and connected with the anti-rotation recess; the cross-section of the connecting pipe is elliptical; the length ratio of the major axis to the minor axis of the ellipse is 1.1 to 1.3.

[0005] The anti-rotation protrusion is in the shape of a strip or an arc, the number of the anti-rotation protrusions is 3 to 4, and the multiple anti-rotation protrusions are arranged separately on the outer circumference of the connecting pipe. The anti-rotation protrusions of corresponding shapes and numbers can meet the required strength and stability of the magnet injection molding component structure on the basis of realizing the industrial production of the clamping part, so that the bonding strength between the magnet and the clamping part is improved, and it is not easy to fall off or loosen, and the shape and number have little effect on the magnetic flux of the magnet.

[0006] Among them, an inclined surface rotating around the circumferential direction is provided on the outer circumference corresponding to the end face of the magnet, and an edge portion protruding around the circumferential direction is provided on the outer circumference corresponding to the inner end face of the clamping part, and the edge portion of the clamping part is covered on the inclined surface of the magnet, and the diameter of the circumference corresponding to the edge portion is not larger than the diameter of the magnet (in actual application, it is smaller than the diameter of the magnet); the outer wall of the connecting tube is fitted and fixed to the inner wall of the center hole I of the magnet, the inner end face of the clamping part is fitted and fixed to the end face of the magnet, and the anti-rotation protrusion of the clamping part is fitted and fixed to the anti-rotation recess of the magnet; the frustum of the clamping part is fitted and fixed to the frustum of the magnet.

[0007] It also includes a coupling injection molding assembly, which includes a rotating shaft and a coupling, the rotating shaft is provided with a first knurled portion and a second knurled portion, the coupling includes a sleeve injection molded on the second knurled portion, a shift block fixed to the outer side wall of the sleeve and extending radially, and a disc arranged on the axial end faces of the sleeve and the shift block.

[0008] Among them, the first clamping part is axially provided with a sleeve on the side away from the second clamping part, and the sleeve includes a receiving cavity and a starting rib fixed at the bottom of the receiving cavity, and also includes an elastic body placed in the receiving cavity; the elastic body includes an inner arc wall surface and an outer arc wall surface arranged oppositely, and also includes left and right passive surfaces and upper and lower end surfaces arranged oppositely; the side of the coupling provided with a shift block is placed in the receiving cavity; the rotating shaft passes through the hollow pipe of the connecting pipe, and the sum of the axial height of the starting rib and the axial height of the shift block is less than the vertical distance between the upper and lower end surfaces of the elastic body, and the axial height of the coupling is less than the axial depth of the receiving cavity. The elastomer of the present invention can better realize the buffering function of the rotor during the starting process, absorb part of the shock wave caused by the starting, and thus prolong the service life of the starting rib and the shift block in the rotor that move relative to it.

[0009] Among them, the elastomer is made of rubber and is arc-shaped; the outer arc wall of the elastomer is provided with a groove in the thickness direction of the elastomer; there is an anti-interference gap between the outer arc wall of the elastomer and the inner wall of the accommodating cavity, and there is an anti-interference gap between the inner arc wall of the elastomer and the outer wall of the sleeve; the accommodating cavity is provided with an arc-shaped groove on the sliding circumference corresponding to the elastomer, and the arc-shaped groove extends along the circumferential direction to both sides of the starting rib.

[0010] The starting rib is arc-shaped, an anti-interference gap is provided between the inner wall of the starting rib and the outer wall of the sleeve, and the end of the starting rib is fixed on the inner wall of the accommodating cavity.

[0011] The coupling is made of plastic, and the shifting block on the coupling is fan-shaped; the rotation angle of the impeller 1 relative to the magnet 2 around the axis is 360°+360°-α-2β-θ, so the angle α between the two side surfaces of the fan-shaped shifting block is 40°~50°; the angle β between the passive surfaces on the left and right sides of the elastomer is 105°~120°; the angle θ corresponding to the two side surfaces of the starting rib is 90°~100°; so that the rotation angle of the impeller relative to the magnet injection molding component around the axis is 330°~380°. At such a rotation angle, the starting performance of the impeller can be guaranteed, the service life of the starting rib and the elastomer can be effectively protected, and the influence of excessive starting force on the stability of the magnet injection molding component can be prevented.

[0012] Among them, the ratio of the inner diameter of the accommodating cavity to the outer diameter of the magnet is 0.75-0.85; the ratio of the outer diameter of the sleeve to the outer diameter of the rotating shaft is 1.4-2; and the axial height of the elastomer is smaller than the axial height of the sleeve.

[0013] Among them, the drainage motor rotor also includes an impeller, a bearing assembly and an end cover, the impeller is fixed on the first knurled portion of the rotating shaft; the bearing assembly is fixed to the rotating shaft through a sliding bearing, the end cover is located on one side of the sleeve opening, and the inner side surface of the end cover is fixed to the outer edge of the sleeve by welding.

[0014] The end cover includes a center hole II and bosses protruding axially on both sides of the center hole II, and the bosses are provided with a rubber ring I at the center hole II, and the rotating shaft passes through the center hole II with the rubber ring I. The purpose of setting the bosses is to reduce the friction loss caused by the axial movement of the end cover and the coupling disc, and the rubber ring I can play a role of flexible support for the rotating shaft.

[0015] Among them, on the side away from the first clamping part, the second clamping part is provided with an annular boss extending along the axial direction on the outer periphery of the central through hole, the annular boss is provided with a rubber ring II at the central through hole, and the rotating shaft passes through the central through hole with the rubber ring II.

[0016] Among them, the drainage motor rotor also includes a third blade arranged on the outside of the end cover, the third blade is fixed on the outer side wall of the part of the boss extending out of the end cover, and the third blade is integrally injection molded with the end cover; the radial outer edge of the third blade does not extend out of the outer circumference of the end cover, and the axial height of the third blade does not exceed the axial height of the part of the boss extending out of the end cover.

[0017] A drainage motor comprising the above drainage motor rotor.

[0018] Beneficial effect: Compared with the prior art, the present invention has the following significant advantages: by arranging mutually matching anti-rotation protrusions and anti-rotation recesses at the junction of the magnet and the clamping part and the cross-section of the cooperative connecting pipe being elliptical, the present invention effectively increases the contact area between the magnet and the clamping part and improves the injection molding bonding force between the magnet and the clamping part, thereby overcoming the problem that the clamping part is easy to fall off or plastically deform from the magnet or the elastomer is easy to rupture under the influence of the impact force and high temperature environment during the starting process of the existing rotor, and can effectively prevent axial relative movement and radial relative rotation between the magnet and the clamping part, and achieves anti-rotation by limiting the length ratio of the major and minor axes of the ellipse without affecting the magnetic field strength of the magnet, so that the drainage motor rotor of the present invention can effectively eliminate the problem of easy loosening or falling off between the magnet and the clamping part and easy rupture of the elastomer; the present invention effectively extends the service life of the rotor while ensuring the starting performance of the rotor, thereby extending the service life of the drainage motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the rotor of the drainage motor of the present invention;

[0020] Figure 2 for Figure 1 Sectional view in the AA direction;

[0021] Figure 3 for Figure 2 A partial enlarged view of middle Ⅰ;

[0022] Figure 4 for Figure 2 Cross-sectional view in the BB direction;

[0023] Figure 5 It is a schematic diagram of the structure of the magnet injection molding component;

[0024] Figure 6 is a schematic diagram of the structure of the magnet;

[0025] Figure 7 It is a structural schematic diagram of the clamping part;

[0026] Figure 8 It is a schematic diagram of the structure of the injection molding component of the coupling;

[0027] Fig. 9 It is a structural schematic diagram of the rotating shaft;

[0028] Fig.10 It is the structural schematic diagram of the coupling;

[0029] Fig.11 is a schematic diagram of the structure of the elastomer;

[0030] Fig.12is a schematic structural diagram of a drainage motor rotor having a third blade;

[0031] Fig.13 is a schematic diagram of a structure having a third blade end cover;

[0032] Fig.14 It is a structural schematic diagram of the angle α between the two side surfaces of the fan-shaped shifting block in the accommodating cavity, the angle β between the left and right passive surfaces of the elastic body, and the angle θ corresponding to the two side surfaces of the starting rib;

[0033] Fig.15 It is a schematic diagram of the structure of the drainage motor of the present invention. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0035] Example 1

[0036] like Figures 1 to 4 As shown, the drainage motor rotor of the present invention includes an impeller 1, a bearing assembly 2, a magnet injection molding assembly 3, a coupling injection molding assembly 4, an elastomer 5 and an end cover 6. The magnet injection molding assembly 3 includes a magnet 31 and a clamping part 32 injection-molded according to the shape of the magnet 31.

[0037] The elastic body 5 and the coupling injection molding component 4 are sequentially placed in the accommodating cavity 3271 of the clamping part 32, and the rotating shaft 41 of the coupling injection molding component 4 passes through the central through hole of the magnet injection molding component 3 and the sliding bearing 21 of the bearing component 2 in turn. The impeller 1 is fixed to the end of the rotating shaft 41. A starting rib 3272 is provided in the accommodating cavity 3271 and is injection-molded together with the bottom of the accommodating cavity 3271. The starting rib 3272 is used to hit one of the passive surfaces 53 of the elastic body 5, and the other passive surface 53 of the elastic body 5 will push the coupling to move. Block 422 drives the rotating shaft 41 and the impeller 1 to rotate. The greater the inertia of the load applied to the impeller 1, the more violent the rotor starts. The more violent the rotor starts, the greater the impact force of the starting rib 3272 on the elastomer 5 and the coupling block 422. This can easily cause the magnet 31 and the clamping part 32 to loosen, fall off or break and fail. Therefore, it is necessary to improve the injection molding bonding force between the magnet 31 and the clamping part 32 and prevent axial relative movement and radial relative stoppage between the magnet 31 and the clamping part 32.

[0038] like Figure 6As shown, at least two anti-rotation recesses 313 are circumferentially separated on the end face 312 of the magnet 31, and a frustum surface 314 facing the center hole I311 of the magnet 31 is provided on the inner circumferential side of the end face 312 of the magnet 31. The anti-rotation recess 313 passes through the frustum surface 314 in the radial direction of the end face 312 and is connected with the center hole I311 of the magnet 31. Under the premise of not affecting the performance of the magnet, and taking into account the strength of the magnet 31 after compression molding and the stability of the end face 312, the surface of the frustum surface is selected as an inclined surface.

[0039] like Figure 7 As shown, at least two anti-rotation protrusions 323 are circumferentially separated on the inner end surface 322 of the clamping part 32, and a frustum surface 324 facing the connecting tube 321 is provided on the inner circumferential side of the inner end surface 322 of the clamping part 32. The anti-rotation protrusion 323 passes through the frustum surface 324 and is connected to the connecting tube 321. Considering the clamping strength of the clamping part 32 and the stability of the inner end surface 322 after injection molding, the surface of the frustum surface is selected as an inclined surface. The anti-rotation protrusion 323 is in the shape of a strip or an arc, and the number of the anti-rotation protrusions 323 is preferably 4, which are separated and arranged on the outer periphery of the connecting tube 321. The anti-rotation protrusions 323 of corresponding shape and number can meet the required structural strength and stability of the magnet injection molding component 3 on the basis of realizing industrial production, so that the bonding strength between the magnet 31 and the clamping part 32 is improved, and it is not easy to fall off or loosen. At the same time, the anti-rotation effect of the magnet 31 and the clamping part 32 can be achieved, and the shape and number have little effect on the magnetic flux of the magnet 31.

[0040] The two inner end surfaces 322 of the clamping portion 32 extend axially outward to form a first clamping portion 326 and a second clamping portion 328 , respectively. The connecting pipe 321 axially connects the first clamping portion 326 and the second clamping portion 328 .

[0041] like Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, the magnet 31 is arranged between the first clamping part 326 and the second clamping part 328, the outer wall of the connecting tube 321 is in close contact with the inner wall of the center hole I311 of the magnet 31, the first clamping part 326 and the second clamping part 328 are connected, the inner end face 322 of the clamping part 32 is in close contact with the end face 312 of the magnet 31 to clamp the two, and the anti-rotation protrusion 323 of the clamping part 32 is in close contact with the anti-rotation concave part 313 of the magnet 31, so that the relative rotation between the magnet 31 and the clamping part 32 is eliminated. The frustum 324 of the clamping part 32 is in close contact with the frustum 314 of the magnet 31, thereby eliminating the relative axial movement between the magnet 31 and the clamping part 32, and at the same time improving the clamping strength of the clamping part 32 and the stability of the inner end surface 322 after injection molding, preventing and eliminating the loosening, falling off or rupture failure between the magnet 31 and the clamping part 32, as well as preventing and eliminating the impact force during the rotor starting process and the problem of plastic deformation of the clamping part 32 caused by long-term operation under high temperature conditions.

[0042] A sleeve 327 is axially arranged on the outer side surface of the first clamping portion 326 , and a starting rib 3272 is radially extended from the inner wall of the accommodating cavity 3271 on the bottom surface of the accommodating cavity 3271 of the sleeve 327 .

[0043] like Figure 8 , Fig. 9 and Fig.10 As shown, the coupling injection molding assembly 4 includes a rotating shaft 41 and a coupling 42. The rotating shaft 41 is provided with a first knurled portion 411 and a second knurled portion 412. Since the first knurled portion 411 directly bears the drainage load of the impeller 1, the coupling 42 is provided with a sleeve 421 injection-molded on the second knurled portion 412. The load borne by the coupling 42 is relatively small. Therefore, the axial length of the first knurled portion 411 is greater than the axial length of the second knurled portion 412. This reduces the increase in the deflection of the rotor at both ends due to the increase in the total length of the rotating shaft, and effectively eliminates the problem of shortened rotor life caused by rotor bore sweeping.

[0044] The coupling 42 is provided with a radially extending shift block 422 on the outer wall of the sleeve 421, and a disk 423 is provided on the axial end faces of the sleeve 421 and the shift block 422. The coupling 42 serves as a power transmission component for the power input of the magnet injection molding assembly 3 and the power output of the rotating shaft 41 and the impeller 1.

[0045] like Fig.11 As shown, the elastomer 5 includes an inner arc wall surface 51 and an outer arc wall surface 52 that are relatively arranged, as well as left and right passive surfaces 53 and upper and lower end surfaces 54 that are relatively arranged. These surfaces can better realize the buffering function of the rotor during the starting process, absorb part of the shock wave caused by the starting, thereby extending the service life of the starting rib 3272 and the shift block 422 in the rotor that move relative to it.

[0046] like Figure 3 , Fig.10 and Fig.11 As shown, the elastomer 5 and the coupling 42 are sequentially placed in the accommodating cavity 3271, and the disc 423 of the coupling 42 axially limits the upper end surface 54 of the elastomer 5. Then the rotating shaft 41 sequentially passes through the connecting tube 321 and the central through hole of the sliding bearing 21 of the bearing assembly 2. The sum of the axial height of the starting rib 3272 and the axial height of the shift block 422 is less than the vertical height between the upper and lower end surfaces 54 of the elastomer 5, so as to eliminate the damage caused by the rigid collision between the starting rib 3272 and the shift block 422 due to the axial movement, and the axial height of the coupling 42 is less than the axial depth of the accommodating cavity 3271.

[0047] like Figure 2 As shown, the impeller 1 includes a center hole 11 of the impeller 1, blades 12, a chassis 13 and a tubular body 14. The tubular body 14 is arranged on both sides of the chassis 13. The center hole 11 of the impeller 1 is arranged at the center of the axis of the tubular body 14. The center hole 11 of the impeller 1 is pressed into the first knurled portion 411 of the shaft end. The axial contact length between the first knurled portion 411 and the center hole 11 of the impeller 1 is greater than the height of the blades 12 along the axial direction. The impeller 1 acts as a direct execution load when discharging water. The tubular body 14 serves as a connecting portion with the rotating shaft 41. The axial contact length between the first knurled portion 411 of the rotating shaft 41 and the center hole 11 of the impeller 1 is greater than the height of the blade 12 along the axial direction. In this way, when the blade 12 discharges water, the load torque borne by the blade 12 will be smaller than the torque that the meshing force between the first knurled portion 411 of the rotating shaft 41 and the center hole 11 of the impeller 1 can withstand, so that the impeller 1 will not fall off the first knurled portion 411, and the chassis 13 can provide sufficient supporting strength for the blade 12, thereby extending the service life of the impeller 1.

[0048] like Figure 2 and Figure 4 As shown, the rotation angle of the impeller 1 relative to the magnet injection molding component 3 around the axis is 330°~380°. If the rotation angle is less than 330°, it will affect the low-voltage starting performance of the drainage motor rotor when the grid voltage fluctuates downward, especially when the voltage is as low as 187V, the drainage motor rotor may not even start; if the rotation angle is greater than 380°, the low-voltage starting performance is excellent, but the starting ribs 3272, the elastomer 5, the coupling 42 and the impeller 1 will be subjected to excessive starting impact force and moment of inertia, causing the clamping part 32 to fall off from the magnet 31 or plastically deform, or the elastomer 5 to rupture, or the coupling 42 and the impeller 1 and the rotating shaft 41 to become loose. For this reason, a reasonable range of values ​​is required for the rotation angle to ensure the service life of the parts in the rotor. The rotation angle of 360° is preferred, that is, the rotation angle of the impeller 1 relative to the magnet injection molding component 3 around the axis is 360°, that is, the impeller 1 rotates one circle with zero load.

[0049] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, an inclined surface 315 rotating in a circumferential direction is provided on the end surface 312 of the magnet 31 toward the circumferential surface of the magnet 31, and an edge portion 325 protruding in a circumferential direction is provided on the outer edge of the inner end surface 322 of the clamping portion 32 toward the connecting tube 321. The edge portion 325 of the clamping portion 32 covers the inclined surface 315 of the magnet 31, thereby eliminating the problem of debris splashing or cracks at the edges and corners of the end surface of the magnet 31. The corresponding circumferential diameter of the edge portion 325 is not greater than the diameter of the magnet 31, which can make the magnet injection molding component 3 easier to demold during injection molding, and the magnet injection molding component 3 is not prone to the phenomenon of magnet injection molding component 3 sweeping the bore in the rotor cavity 91 due to the small air gap of the motor or the large deflection of the two ends of the magnet injection molding component 3 during high-speed rotation, so as to ensure the service life.

[0050] The inner wall cross-section of the center hole I311 of the magnet 31 is elliptical, the outer wall cross-section of the connecting tube 321 of the clamping part 32 is elliptical, the inner wall clearance of the rotating shaft 41 and the connecting tube 321 is matched, and the inner wall of the center hole I311 of the magnet 31 and the outer wall of the connecting tube 321 are elliptical and tightly attached, which further limits the relative rotation between the clamping part 32 and the magnet 31 in the circumferential direction, avoiding relative looseness or falling off between the two, affecting the service life.

[0051] like Figure 2 As shown, the bearing assembly 2 includes a sliding bearing 21, a rubber sleeve 22 and a bracket 23. The sliding bearing 21 is placed in the rubber sleeve 22. The rubber sleeve 22 is adapted to the bracket 23 to support the magnet injection molding assembly 3 and the impeller 1, and has better supporting stability.

[0052] like Figure 3 As shown, a boss 62 protruding toward both sides is provided in the axial direction near the center hole II61 of the end cover 6, and a rubber ring I7 is inserted into the boss 62. The rotating shaft 41 passes through the center hole I61 with the rubber ring I7. The purpose of setting the boss 62 is to reduce the friction loss caused by the movement of the end cover 6 and the disc 423 of the coupling 42 in the axial direction, and the rubber ring 7 plays a role of a flexible support for the rotating shaft 41.

[0053] like Figure 4 As shown, the elastomer 5 is made of rubber and is fan-shaped. The coupling 42 is made of plastic. The shift block 422 of the coupling 42 is fan-shaped, and the angle between the two passive surfaces 53 of the elastomer 5 is larger than the angle between the two side surfaces of the shift block 422. This can ensure the strength of the parts between the two after the impact force, and will not affect the rotation angle of the impeller 1 relative to the magnet injection molding component 3 around the axis due to the large volume of the two, thereby affecting the starting performance.

[0054] like Figure 3 and Figure 4 As shown, the ratio of the diameter of the accommodating cavity 3271 to the diameter of the magnet 31 is 0.75 to 0.85, and the bottom surface of the accommodating cavity 3271 has an arc-shaped groove 3273, which extends along the circumferential direction to both sides of the starting rib 3272. The ratio of the diameter of the accommodating cavity 3271 to the diameter of the magnet 31 is within this range, which can better ensure that the impact force borne by the accommodating cavity 3271 is not easy to be plastically deformed. At the same time, the arc-shaped groove 3273 can also reduce the friction between the lower end surface 54 of the elastomer 5 and the bottom surface of the accommodating cavity 3271, so as to ensure the service life of the accommodating cavity 3271 and the elastomer 5.

[0055] The diameter ratio of the sleeve 421 to the rotating shaft 41 is 1.4-2, and the sum of the axial height of the starting rib 3272 and the axial height of the shift block 422 is smaller than the axial height of the sleeve 421, so as to prevent the starting rib 3272 and the shift block 422 from being damaged by rigid collision due to axial movement, thereby affecting the service life of the rotor.

[0056] The axial height of the shift block 422 is not less than the axial height of the start rib 3272. Considering the service life of both, the strength of the shift block 422 needs to be strengthened. The ratio of the axial height of the shift block 422 to the axial height of the start rib 3272 is 1.1 to 1.3.

[0057] The accommodating cavity 3271 contains lubricating oil, which can reduce the mutual friction between the parts. The lubricating oil also has a damping and buffering effect on the starting impact force between the starting rib 3272, the elastic body 5 and the shifting block 422 in the accommodating cavity 3271 to ensure the service life.

[0058] like Figure 2 and Figure 7 As shown, the outer side surface of the second clamping portion 328 protrudes outward along the axis close to the axial direction to form an annular boss 329, and a rubber ring II8 is arranged inside the annular boss 329. The rotating shaft 41 passes through the rubber ring II8. The annular boss 329 can reduce the friction between the end face of the sliding bearing 21 in the bearing assembly 2 due to axial movement, and the rubber ring 8 plays a role of a flexible support for the other end of the rotating shaft 41.

[0059] like Figure 4 and Fig.11As shown, the outer arc wall surface 52 of the elastic body 5 is provided with a groove 55 in the thickness direction of the elastic body 5 to reduce the friction area between the inner wall of the accommodating cavity 3271 and the outer arc wall surface 52 of the elastic body 5. There is an anti-interference gap between the outer arc wall surface 52 of the elastic body 5 and the inner wall of the accommodating cavity 3271, and there is an anti-interference gap between the inner arc wall surface 51 of the elastic body 5 and the outer wall of the sleeve 421, so that the free sliding along the circumferential direction between the elastic body 5 and the inner wall of the accommodating cavity 3271 and between the elastic body 5 and the outer wall of the sleeve 421 is ensured, thereby reducing the wear of the elastic body 5.

[0060] There is an anti-interference gap between the inner wall of the starting rib 3272 and the outer wall of the sleeve 421 to prevent radial rigid collision damage between the two.

[0061] like Figure 2 As shown, a ring 15 protrudes from the chassis 13 of the impeller 1 in the axial direction away from the blades 12. The ring 15 surrounds the tubular body 14, which can prevent foreign matter from entering between the tubular body 14 and the bearing assembly 2 from the side of the impeller 1, thereby preventing entanglement or wear. Auxiliary blades 16 and balancing holes 17 are arranged on the chassis 13 outside the ring 15. There are at least 6 auxiliary blades 16 and balancing holes 17, which are evenly distributed on the chassis 13 around the rotating shaft 41.

[0062] like Figure 3 As shown, the inner side surface 63 of the end cover 6 and the outer edge 3274 of the sleeve 327 are welded at their contact surfaces by ultrasonic welding, so that the end cover 6 and the magnet injection molding assembly 3 become a whole.

[0063] like Fig.12 and Fig.13 As shown, the drain motor rotor also includes a third blade 64 arranged on the outer side of the end cover 6. The third blade 64 is fixed on the outer side wall of the portion of the boss 62 extending out of the end cover 6. The third blade 64 is integrally injection molded with the end cover 6. The radial outer edge of the third blade 64 does not extend out of the outer circumference of the end cover 6, and the axial height of the third blade 64 does not exceed the axial height of the portion of the boss 62 extending out of the end cover 6. The air flow generated by the third blade 64 can not only cool the surface of the magnet 31, thereby further preventing the magnet 31 from overheating and causing the clamping part 32 to easily fall off the magnet 31, but also generate an axial force opposite to the blade 12 of the impeller 1, thereby effectively reducing the axial movement of the rotor. The radial edge of the third blade 64 does not exceed the outer circumference of the end cover 6, which can prevent the third blade 64 from sweeping the rotor cavity 91 in the radial direction. The axial height of the third blade 64 does not exceed the axial height of the portion of the boss 62 extending out of the end cover 6, which can prevent the third blade 64 from interfering with the bottom surface of the rotor cavity 91 in the axial direction, thereby affecting the service life of the rotor.

[0064] like Fig.15 As shown, the drainage motor of the present invention comprises Figure 1 The drainage electronic rotor shown also includes a stator 9 sleeved on the outside of the rotor. The drainage motor rotor is installed in a rotor cavity 91 surrounded by the stator 9. The end of the rotating shaft 41 away from the impeller 1 is placed in the center hole of the sliding bearing 92. The bearing assembly 2 and the stop 93 of the stator 9 are sealed. The external air of the drainage motor enters the rotor cavity 91 through the air inlet and outlet 94 of the stator 9. Under the action of the third blade 64, the air flows along the inner wall of the rotor cavity 91 toward the bearing assembly 2, and then the air is discharged from the air inlet and outlet 94. As long as the third blade 64 rotates, the air will circulate in the rotor cavity 91 to cool the magnet injection molding assembly 3 to prevent the clamping part 32 and the magnet 31 from loosening or even falling off due to the high temperature of the magnet injection molding assembly 3, so as to improve the service life of the drainage motor rotor. At the same time, when the drainage motor rotor rotates at high speed, a negative pressure will be generated around the impeller 1, and the drainage motor rotor will generate an axial force F1. Under the action of the axial force F1, the drainage motor rotor is prone to axial movement along the F1 direction. After the third blade 64 is set, a negative pressure will also be generated around the rotating third blade 64, forming a force F2 that balances the direction of the F1 force. The axial force F1 is in opposite directions to the axial force F2, thereby effectively preventing the drainage motor rotor from axially moving.

[0065] Comparative Example 1

[0066] The drainage electronic rotor of comparative example 1 is substantially the same in structure as the drainage electronic rotor of example 1, with the only difference being that the inner end surface 322 of the first clamping portion 326 and the second clamping portion 328 in the clamping portion 32 is a plane, and no anti-rotation protrusion 323 is provided.

[0067] Comparative Example 2

[0068] The drainage electronic rotor of comparative embodiment 2 is substantially the same in structure as the drainage electronic rotor of embodiment 1, with the only difference being that the cross section of the connecting pipe 321 is circular.

[0069] Comparative Example 3

[0070] The drainage electronic rotor of comparative embodiment 3 is substantially the same in structure as the drainage electronic rotor of embodiment 1, with the only difference being that the third blade 64 is not provided on the outer side of the end cover 6 .

[0071] Comparative Example 4

[0072] The drainage electronic rotor of comparative example 4 is basically the same in structure as the drainage electronic rotor of example 1, except that the third blade 64 is not provided on the outer side of the end cover 6, the cross section of the connecting tube 321 is circular, and the inner end surface 322 of the first clamping portion 326 and the second clamping portion 328 is a plane, and the anti-rotation protrusion 323 is not provided.

[0073] The drainage motor containing the drainage electronic rotor of the present invention and the drainage motor containing the drainage electronic rotor of comparative examples 1 to 4 were operated under the same environment, specifically: the rated voltage was applied to power on for operation, with a cycle of running for 10 seconds and stopping for 10 seconds, working for 8 to 12 hours during the day, the working environment was 70 degrees hot water, and the rest of the time the working environment was room temperature water; after 300,000 consecutive cycles, the conditions of the corresponding components of the rotor in each drainage motor were as shown in Table 1.

[0074] Table 1

[0075]

Claims

1. A drainage motor rotor, characterized in that: The invention comprises a magnet injection molding component (3), wherein the magnet injection molding component (3) comprises a magnet (31) and a clamping portion (32) injection-molded according to the shape of the magnet (31); the clamping portion (32) comprises a first clamping portion (326), a second clamping portion (328) and a connecting pipe (321) connecting the first clamping portion (326) and the second clamping portion (328); the magnet (31) has a central hole I (311) for the connecting pipe (321) to pass through; the magnet (31) is sleeved on the connecting pipe (321) and is clamped and fixed to the clamping portion (321) by the first clamping portion (326) and the second clamping portion (328). 32), the first clamping portion (326) is provided with at least two anti-rotation protrusions (323) on the inner end surface (322) close to the second clamping portion (328), the magnet (31) is provided with an anti-rotation recess (313) at the corresponding position of the anti-rotation protrusion (323) on the first clamping portion (326), when the magnet (31) is sleeved on the connecting tube (321), the anti-rotation protrusion (323) on the inner end surface of the first clamping portion (326) is embedded in the anti-rotation recess (313) on the corresponding end surface (312) of the magnet (31) and is connected with the anti-rotation recess (313); the cross section of the connecting tube (321) is elliptical; The invention also comprises a coupling injection molding assembly (4), wherein the coupling injection molding assembly (4) comprises a rotating shaft (41) and a coupling (42), wherein the rotating shaft (41) is provided with a first knurled portion (411) and a second knurled portion (412), and the coupling (42) comprises a shaft sleeve (421) injection-molded on the second knurled portion (412), a shifting block (422) fixed to the outer side wall of the shaft sleeve (421) and extending in the radial direction, and a disk (423) arranged on the axial end surfaces of the shaft sleeve (421) and the shifting block (422); the first clamping portion (326) is disposed at a position away from the second clamping portion A sleeve (327) is axially arranged on one side of the holding portion (328), the sleeve (327) comprising a receiving cavity (3271) and a starting rib (3272) fixed at the bottom of the receiving cavity (3271), and also comprising an elastic body (5) placed in the receiving cavity (3271); the elastic body (5) comprises an inner arc wall surface (51) and an outer arc wall surface (52) arranged opposite to each other, and also comprises left and right passive surfaces (53) and upper and lower end surfaces (54) arranged opposite to each other; the coupling (42) is provided with a shifting block (422) on one side thereof and is placed in the receiving cavity (3271); 271); the rotating shaft (41) passes through the hollow pipe of the connecting pipe (321); the sum of the axial height of the starting rib (3272) and the axial height of the shifting block (422) is less than the vertical distance between the upper and lower end surfaces (54) of the elastic body (5), and the axial height of the coupling (42) is less than the axial depth of the accommodating cavity (3271); the coupling (42) is made of plastic, and the shifting block (422) on the coupling (42) is fan-shaped; the angle α between the two side surfaces of the fan-shaped shifting block (422) is 40° to 50°; the left side of the elastic body (5) The included angle β between the right passive surfaces (53) is 105° to 120°; the corresponding angle θ between the two side surfaces of the starting rib (3272) is 90° to 100°; thereby, the rotation angle of the impeller (1) relative to the magnet injection molding component (3) around the axis is 330° to 380°; the ratio of the inner diameter of the accommodating cavity (3271) to the outer diameter of the magnet (31) is 0.75 to 0.85; the ratio of the outer diameter of the shaft sleeve (421) to the outer diameter of the rotating shaft (41) is 1.4 to 2; the axial height of the elastic body (5) is smaller than the axial height of the shaft sleeve (421); The drainage motor rotor further comprises an impeller (1), a bearing assembly (2) and an end cover (6); the impeller (1) is fixed on a first knurled portion (411) of a rotating shaft (41); the bearing assembly (2) is fixedly connected to the rotating shaft (41) via a sliding bearing (21); the end cover (6) is located on one side of an opening of the sleeve (327); an inner side surface (63) of the end cover (6) and an outer edge (3274) of the sleeve (327) are fixed by welding; the end cover (6) comprises a center hole and bosses (62) protruding axially toward both sides of the center hole; the bosses ( 62) is provided with a rubber ring I (7) at the center hole, and the rotating shaft 41 passes through the center hole with the rubber ring I (7); the drainage motor rotor also includes a third blade (64) arranged on the outside of the end cover (6), and the third blade (64) is fixed on the outer side wall of the boss (62) extending out of the end cover (6), and the third blade (64) and the end cover (6) are integrally injection molded; the radial outer edge of the third blade (64) does not extend out of the outer circumference of the end cover (6), and the axial height of the third blade (64) does not exceed the axial height of the boss (62) extending out of the end cover (6).

2. The drainage motor rotor according to claim 1, characterized in that: The length ratio of the major axis to the minor axis of the ellipse is 1.1 to 1.

3.

3. The drainage motor rotor according to claim 1, characterized in that: The anti-rotation protrusion (323) is in the shape of a strip or an arc, the number of the anti-rotation protrusion (323) is 3 to 4, and the plurality of anti-rotation protrusions (323) are arranged separately on the outer circumference of the connecting pipe (321).

4. The drainage motor rotor according to claim 1, characterized in that: An inclined surface (315) rotating in a circumferential direction is provided on the outer circumference corresponding to the end surface (312) of the magnet (31), and an edge portion (325) protruding in a circumferential direction is provided on the outer circumference corresponding to the inner end surface (322) of the clamping portion (32), the edge portion (325) of the clamping portion (32) is covered on the inclined surface (315) of the magnet (31), and the diameter of the circumference corresponding to the edge portion (325) is not greater than the diameter of the magnet (31); the outer wall of the connecting tube (321) is fitted and fixed to the inner wall of the center hole I (311) of the magnet (31), and the inner end surface (322) of the clamping portion (32) is fitted and fixed to the end surface (312) of the magnet (31).

5. The drainage motor rotor according to claim 1, characterized in that: The elastic body (5) is made of rubber and is arc-shaped; the outer arc wall surface (52) of the elastic body (5) is provided with a groove (55) in the thickness direction of the elastic body (5); an anti-interference gap is provided between the outer arc wall surface (52) of the elastic body (5) and the inner wall of the accommodating cavity (3271); an anti-interference gap is provided between the inner arc wall surface (51) of the elastic body (5) and the outer side wall of the shaft sleeve (421); the accommodating cavity (3271) is provided with an arc-shaped groove (3273) on the sliding circumference corresponding to the elastic body (5), and the arc-shaped groove (3273) extends along the circumferential direction to both sides of the starting rib (3272).

6. The drainage motor rotor according to claim 1, characterized in that: The starting rib (3272) is arc-shaped, and an anti-interference gap is provided between the inner wall of the starting rib (3272) and the outer wall of the shaft sleeve (421), and the end of the starting rib (3272) is fixed on the inner wall of the accommodating cavity (3271).

7. The drainage motor rotor according to claim 1, characterized in that: On the side away from the first clamping portion (326), the second clamping portion (328) is provided with an annular boss (329) extending along the axial direction on the outer periphery of the central through hole, and the annular boss (329) is provided with a rubber ring II (8) at the central through hole, and the rotating shaft (41) passes through the central through hole with the rubber ring II (8).

8. A drainage motor comprising the drainage motor rotor according to any one of claims 1 to 7.

Images