Permanent magnet synchronous drainage motor

Abstract

The permanent magnet synchronous drainage motor is applied to the field of drainage motors and comprises a motor shaft, a magnet, a coupler, a bearing assembly, an elastic body, an end cover and an impeller, a sealing hole is formed in the end, close to the bearing assembly, of the impeller, a sealing ring is arranged in the sealing hole, and an impeller cavity is formed in the other end, away from the bearing assembly, of the impeller; the motor shaft penetrates through a center hole of the sealing ring and extends into the impeller cavity, a driven rib is arranged on the face, facing the bearing assembly, of the end cover, a welding face is arranged on the edge of the end cover, and the end face of the impeller is welded to the welding face. The impeller has the technical effects that the end face of the impeller and the welding face are welded in the welding space, the possibility of loss of lubricating oil in an impeller cavity is reduced, the lubricating effect of the coupler and the elastic body is guaranteed, and the service life of the coupler and the elastic body is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of drainage motors, and in particular to a permanent magnet synchronous drainage motor. Background Art

[0002] The permanent magnet synchronous drainage motor is a high-performance motor that uses permanent magnets to generate magnetic fields. It has the characteristics of simple structure, small size, light weight, high efficiency, high power factor, and reliable operation. In the drainage system, the permanent magnet synchronous drainage motor can be used as a drive device to provide an efficient and energy-saving solution.

[0003] Reference Figure 1 In the related art, the permanent magnet synchronous drainage motor includes a motor shaft 1, a magnet 2, a plastic sealing part 3, a bearing assembly 4, an impeller 5 and a sealing ring 6. The motor shaft 1 and the magnet 2 are injection molded into one piece through the plastic sealing part 3. An impeller cavity is provided at one end of the impeller 5 close to the bearing assembly 4. An end cover 9 is provided in the port of the impeller cavity close to the bearing assembly 4. The motor shaft 1 passes through the center hole of the sealing ring 6 and extends into the impeller cavity. A coupling 7 and an elastomer 8 are inserted into the impeller cavity. There is lubricating oil in the impeller cavity.

[0004] During the use of the above-mentioned permanent magnet synchronous drainage motor, due to the gap 10 at the junction of the end cover 9 and the inner wall of the impeller chamber, the lubricating oil in the impeller chamber will slowly leak out from the gap 10 during use, thereby reducing the lubrication effect and service life of the coupling 7 and the elastomer 8. There is not enough welding space to weld the end cover 9 to the impeller 5 through a welding head. Therefore, the sealing of the impeller chamber can only be improved by optimizing the design of the rotor structure to ensure the lubrication effect and service life of the coupling and the elastomer. Summary of the invention

[0005] In order to help solve the problem of poor lubrication between the coupling and the elastomer due to leakage of lubricating oil in the impeller cavity during use of the existing permanent magnet synchronous drainage motor, the present application provides a permanent magnet synchronous drainage motor, which adopts the following technical scheme: it includes a motor shaft, a magnet, a coupling, a bearing assembly, an elastomer, an end cover and an impeller, a sealing hole is provided at one end of the impeller close to the bearing assembly, a sealing ring is placed in the sealing hole, an impeller cavity is provided at the other end of the impeller away from the bearing assembly, the motor shaft passes through the center hole of the sealing ring and extends into the impeller cavity, passive ribs are provided on the surface of the end cover facing the bearing assembly, a welding surface is provided on the edge of the end cover, and the end face of the impeller is welded to the welding surface.

[0006] In a specific possible implementation scheme, a plunger is provided on the surface of the end cover facing the bearing assembly, the plunger is embedded in the impeller cavity and the passive rib is arranged at one end of the plunger facing the impeller cavity.

[0007] In a specific possible implementation manner, the end cover is provided with a central blind hole, and the end of the motor shaft extends into the central blind hole.

[0008] In a specific possible implementation manner, a shift block is provided on the outer edge of the coupling.

[0009] In a specific implementation manner, the dial block is fan-shaped.

[0010] In a specific embodiment, the elastomer is in a fan shape.

[0011] In a specific possible implementation manner, the motor shaft and the magnet are injection molded into one piece through a plastic sealing part.

[0012] In a specific embodiment, the impeller and the end cover are both made of plastic material.

[0013] In a specific embodiment, the coupling is made of metal material.

[0014] In a specific embodiment, the elastic body is made of rubber material.

[0015] In summary, the present application has the following beneficial technical effects: since the end cover of the prior art is close to the bearing assembly, the welding head has no space for welding operation to weld the end cover and the end face of the impeller, and the end cover can only be embedded in the port of the impeller cavity close to the bearing assembly, which causes poor sealing performance of the impeller cavity. Therefore, the utility model is provided with an impeller cavity at the other end of the impeller away from the bearing assembly, and the end cover is provided with a plunger, the plunger is embedded in the impeller cavity, and the edge of the end cover is provided with a welding surface. There is sufficient welding space to weld the end face of the impeller to the welding surface, thereby reducing the possibility of loss of lubricating oil in the impeller cavity, ensuring the lubrication effect of the coupling and the elastomer, and improving the service life of the coupling and the elastomer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a permanent magnet synchronous drainage motor rotor in the related technology.

[0017] Figure 2 It is a cross-sectional schematic diagram of an embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the end face and the welding surface of the impeller of the embodiment of the present application being welded by a welding head.

[0019] Figure 4 It is a cross-sectional schematic diagram used to illustrate the impeller in the embodiment of the present application.

[0020] Figure 5 It is a cross-sectional schematic diagram used to illustrate the shift block in the embodiment of the present application.

[0021] Figure numerals: 1. motor shaft; 2. magnet; 3. plastic sealing part; 4. bearing assembly; 5. impeller; 6. sealing ring; 7. coupling; 8. elastomer; 9. end cover; 51. sealing hole; 52. impeller cavity; 53. end face; 91. plunger; 92. passive rib; 93. welding surface; 94. center blind hole; 71. shift block. DETAILED DESCRIPTION

[0022] The following is combined with Figure 2-5 This application is described in further detail.

[0023] The embodiment of the present application discloses a permanent magnet synchronous drainage motor.

[0024] Reference Figure 2 and Figure 3 The permanent magnet synchronous drainage motor includes a motor shaft 1, a magnet 2, a plastic sealing part 3, a bearing assembly 4, an impeller 5, an elastomer 8 and an end cover 9. In the embodiment of the present application, the motor shaft 1 and the magnet 2 are injection molded into one piece through the plastic sealing part 3. The injection molded-in-one design makes the connection between the motor shaft 1 and the magnet 2 tighter, reduces the gap and looseness caused by assembly, improves the running stability of the permanent magnet synchronous drainage motor and reduces the noise level.

[0025] Reference Figure 3 and Figure 4 An impeller cavity 52 is provided at the other end of the impeller 5 away from the bearing assembly 4, and lubricating oil is contained in the impeller cavity 52. ​​A sealing hole 51 is provided at the end of the impeller 5 close to the bearing assembly 4, and a sealing ring 6 is placed in the sealing hole 51. In the embodiment of the present application, the sealing ring 6 can be an O-ring or an oil seal for sealing. The sealing ring 6 improves the sealing performance and plays a role of shock absorption and buffering.

[0026] Reference Figure 3 and Figure 4 The motor shaft 1 passes through the center hole of the sealing ring 6 and extends into the impeller cavity 52. ​​The center holes of the motor shaft 1 and the sealing ring 6 are installed by interference fit. The center hole of the coupling 7 is pressed into the motor shaft 1 through the impeller cavity 52. ​​The elastomer 8 is placed in the impeller cavity 52. ​​The edge of the end cover 9 is provided with a welding surface 93. The end cover 9 is fixedly connected with a plunger 91, and the plunger 91 is embedded in the impeller cavity 52. ​​The plunger 91 is axially fixedly connected with a passive rib 92, which reduces the possibility of the end cover 9 deviating from the impeller cavity 52. ​​The plunger 91 enhances the stability of the end cover 9 connected to the impeller 5.

[0027] Therefore, the welding head has sufficient welding operation space to weld the end face 53 of the impeller 5 and the welding surface 93 of the edge of the end cover 9 from the outer top of the impeller 5, thereby realizing the operability of the welding equipment for welding the impeller 5 and the end cover 9, improving the sealing performance of the impeller cavity 52, reducing the possibility of loss of lubricating oil in the impeller cavity 52, and ensuring the lubrication effect and service life of the coupling 7 and the elastomer 8.

[0028] Reference Figure 3 and Figure 4 In order to further achieve the welding effect, the end face 53 of the impeller 5 and the welding surface 93 are welded by ultrasonic welding. In the embodiment of the present application, the impeller 5 and the end cover 9 are made of plastic material, and the plastic material can be better fused together after ultrasonic welding. The energy generated by the ultrasonic wave is transmitted to the end face 53 of the impeller 5 and the welding surface 93 through the welding head, so that the annular contact surfaces of the two are fused and become a whole, so as to achieve a better sealing effect without causing deformation of other parts due to fusion to affect the rotor performance.

[0029] Reference Figure 3 and Figure 4 A central blind hole 94 is provided on the surface of the end cover 9 facing the impeller cavity 52, and the end of the motor shaft 1 extends into the central blind hole 94. The central blind hole 94 provides a support point for the end of the motor shaft 1, thereby improving the stability of the impeller 5 during rotation.

[0030] Reference Figure 3 and Figure 5 The coupling 7 is made of metal, and a shift block 71 is protruded on the outer circumferential wall of the coupling 7. The shift block 71 and the elastic body 8 are fan-shaped. The structural design of the fan-shaped shift block 71 can better balance the dynamic performance of the coupling 7, reduce the noise and vibration caused by imbalance, and improve the transmission efficiency. In the embodiment of the present application, the elastic body 8 is made of rubber, so that the elastic body 8 has good shock-absorbing and buffering performance while transmitting the force.

[0031] The implementation principle of the embodiment of the present application is as follows: when the magnet 2 rotates with power input, the shifting block 71 of the coupling 7 pressed into the motor shaft 1 will rotate accordingly, and the shifting block 71 pushes the elastic body 8 to slide around the axis of the impeller 5 in the impeller cavity 52, and the elastic body 8 pushes the passive rib 92 axially arranged on the plunger 91, thereby driving the impeller 5 to rotate. The lubricating oil in the impeller cavity 52 lubricates the coupling 7 and the elastomer 8 in relative motion to reduce the wear between the coupling 7 and the elastomer 8. The sealing structure of the impeller cavity 52 of the utility model ensures that the lubricating oil will not be lost, thereby ensuring the lubrication effect and service life of the coupling 7 and the elastomer 8.

[0032] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A permanent magnet synchronous drainage motor, characterized in that: The invention comprises a motor shaft (1), a magnet (2), a coupling (7), a bearing assembly (4), an elastomer (8), an end cover (9) and an impeller (5); a sealing hole (51) is provided at one end of the impeller (5) close to the bearing assembly (4); a sealing ring (6) is inserted into the sealing hole (51); an impeller cavity is provided at the other end of the impeller (5) away from the bearing assembly (4); the motor shaft (1) passes through the central hole of the sealing ring (6) and extends into the impeller cavity (52); a passive rib (92) is provided on the surface of the end cover (9) facing the bearing assembly (4); a welding surface (93) is provided on the edge of the end cover (9); and the end surface (53) of the impeller (5) is welded to the welding surface (93).

2. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: A plunger (91) is provided on the surface of the end cover (9) facing the bearing assembly (4); the plunger (91) is embedded in the impeller cavity (52) and a passive rib (92) is provided at one end of the plunger (91) facing the impeller cavity (52).

3. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: The end cover (9) is provided with a central blind hole (94), and the end of the motor shaft (1) extends into the central blind hole (94).

4. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: A shifting block (71) is provided on the outer edge of the coupling (7).

5. The permanent magnet synchronous drainage motor according to claim 4 is characterized in that: The shifting block (71) is fan-shaped.

6. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: The elastic body (8) is fan-shaped.

7. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: The motor shaft (1) and the magnet (2) are injection molded into one piece through a plastic sealing portion (3).

8. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: The impeller (5) and the end cover (9) are both made of plastic material.

9. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: The coupling (7) is made of metal material.

10. The permanent magnet synchronous drainage motor according to claim 1, characterized in that: The elastic body (8) is made of rubber material.

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