CN205231917U - PMSM starting drive of damping low noise - Google Patents

Abstract

The utility model belongs to the technical field of household appliances, and relates to a starting device for a permanent magnet synchronous motor with vibration reduction and low noise, which comprises an impeller, a vibration reduction rubber, a shaft coupling and a card; The vibration rubber is provided with a second installation groove, the vibration-damping rubber is embedded in the first installation groove, the coupling is arranged in the second installation groove, and the card is installed in the first installation groove. The open end of the first mounting slot. Beneficial effects: The shock-absorbing rubber adopts an integral structure, which is large in size and strong in impact resistance, and can effectively absorb and reduce the collision sound and vibration during startup; it has long service life, low noise and vibration, simple and compact assembly, and is not easy to loosen ;It can prevent the shock-absorbing rubber from detaching from the inner wall of the impeller after long-term operation, and prevent the grease leakage in the starting cavity.

Description

A permanent magnet synchronous motor starting device with vibration reduction and low noise

technical field

The utility model belongs to the technical field of household appliances, and relates to a starting device for a permanent magnet synchronous motor, in particular to a starting device for a permanent magnet synchronous motor used for a drainage pump of a household appliance.

Background technique

Due to its simple structure, high efficiency, and low production cost, the permanent magnet synchronous motor has broad application prospects in the field of household appliances, especially in the field of drainage pumps for household appliances such as washing machines and dishwashers.

For the existing synchronous motors, in order to solve the problem of heavy load and easy burning of the motor when the drainage pump is started, it is necessary to add a starting device. This starting device is usually composed of a starting rib and a limiting rib. power transmission. At the same time, in order to reduce the noise generated when the starting device collides, damping rubbers are usually provided on both sides of the starting rib or both sides of the limiting rib.

However, after the drainage pump has been in operation for a long time, especially when the starting performance of the motor is reduced due to voltage fluctuations and high motor temperature, it may require multiple collisions in the starting chamber to start the motor, thus causing greater vibration and noise. At the same time, it will cause greater impact on the damping rubber, which will affect the life of the damping rubber. Therefore, the structure of the damping rubber has an important impact on the vibration and noise when the motor is started, and the life of the starting mechanism, so it is mentioned in many patent documents.

The utility model patent with the authorized notification number CN2916195Y adopts the scheme of fixing vibration-absorbing rubber on each collision surface of the starting rib and the limiting rib. This structure can ensure that the collision occurs between the rubbers, and the noise is relatively small. However, in order to ensure a sufficient idle stroke angle when starting, the thickness of the damping rubber is small, and the impact resistance is insufficient. At the same time, there are many parts and the assembly is more complicated.

The utility model patent with the authorized announcement number US20050023911A1 discloses another synchronous motor transmission device: the starting rib and the limiting rib are located on different working surfaces, there is no axial interference, and the starting rib first hits the lower half of the vibration-damping rubber And drive it to rotate, so that the upper half of the vibration-absorbing rubber hits the limit rib, thereby realizing the starting of the motor. This structure can use a larger volume of vibration-damping rubber while ensuring the idle stroke angle, which is of great help to reduce the starting noise of the motor, but its defect is: the force of the starting rib and the limiting rib on the vibration-damping rubber Not in a straight line, which will cause the distortion of the vibration-absorbing rubber, which will easily cause the failure of the vibration-damping rubber, which greatly affects the life of the vibration-damping rubber.

The utility model patent whose authorized notification number is CN2931869Y adopts a cylindrical rotatable vibration-damping rubber in section. This solution can ensure a sufficient idling angle and a reasonable force direction of the rubber during a collision, but a single damping rubber is small in size and limited in strength. In order to ensure the life of the rubber, it is usually necessary to choose a harder material, resulting in a relatively loud start-up noise.

To sum up, under the premise of existing materials and processing technology conditions and ensuring a sufficient idle stroke angle, designing a reasonable force-bearing structure and increasing the volume of the vibration-damping rubber as much as possible is an effective solution to improve the startup noise.

Utility model content

The purpose of the utility model is to overcome the defect of the poor effect of the starter device of the vibration reduction and low noise permanent magnet synchronous motor in the prior art, and provide a starter device of the permanent magnet motor with vibration reduction and low noise.

The technical solution adopted by the utility model to solve the technical problem is: a permanent magnet synchronous motor starting device with vibration reduction and low noise, including an impeller, a vibration reduction rubber, a shaft coupling and a card; the upper part of the impeller is provided with a first installation groove, the vibration-damping rubber is provided with a second installation groove, the vibration-damping rubber is embedded in the first installation groove, the coupling is arranged in the second installation groove, and the The card is installed at the opening end of the first installation groove.

Preferably, the bottom surface of the first installation groove is provided with a first groove, and the bottom surface of the vibration-damping rubber is provided with a first boss matching the first groove. When installing, insert the first boss into the first groove, lock the vibration-damping rubber to prevent the rubber from detaching from the inner wall of the first installation groove of the impeller during collision, and at the same time, the motor shaft or coupling can extend into the second installation In the groove, the vibration of the impeller is reduced.

Preferably, a second groove is provided on the side wall of the first installation groove, and a second boss matching the second groove is provided on the side wall of the vibration-damping rubber. Inserting the second boss into the second groove during installation can lock the vibration-damping rubber to prevent rubber displacement of the vibration-damping rubber caused by shock during startup.

Preferably, the upper edge of the damping rubber is provided with an extension end, and the extension end is located between the impeller and the lower surface of the card. The extension can act as a seal to prevent grease leakage.

As a preference, the inner wall of the second installation groove is provided with an annular protrusion, and when the motor shaft or coupling is inserted into the second installation groove, the motor shaft or coupling and the annular protrusion on the inner wall of the second installation groove There is a small amount of interference, which plays a role in stabilizing and damping vibration.

Further, one end of the coupling is open, the motor shaft is arranged in the coupling, and the coupling is interference-fitted with the annular protrusion. There is a small amount of interference between the coupling and the annular protrusion, which can play a role in stabilizing and damping vibration.

As another solution of the above installation method, the two ends of the coupling are open, the motor shaft passes through the coupling and extends into the bottom of the second installation groove, and the motor shaft interferes with the annular protrusion Cooperate. There is a small amount of interference between the motor shaft and the annular protrusion, which can play a role of stabilizing and damping vibration.

Preferably, the bottom surface of the second installation groove is provided with a bump concentric with the motor shaft, and the motor shaft or the coupling is in point contact with the bottom surface of the second installation groove through the bump. During the operation of the motor, the motor shaft has a small axial movement back and forth. When the motor shaft moves forward, it will touch the bumps of the rubber, which play a certain buffering role. At the same time, because the contact area between the bumps and the motor shaft or coupling Small and located in the center of rotation, the frictional resistance is small and will not affect the start.

Beneficial effects: The shock-absorbing rubber adopts an integral structure, which is large in size and strong in impact resistance, and can effectively absorb and reduce the collision sound and vibration during startup; it has long service life, low noise and vibration, simple and compact assembly, and is not easy to loosen ; It can prevent the vibration-damping rubber from detaching from the inner wall of the impeller after long-term operation, and prevent the grease leakage in the starting cavity.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is a schematic diagram of the explosion structure of the starting device;

Figure 2 is a front view of the impeller;

Fig. 3 is a sectional view in the direction of Fig. 2A-A;

Fig. 4 is a schematic diagram of the three-dimensional structure of the vibration-damping rubber;

Fig. 5 is a bottom view of the damping rubber;

Fig. 6 is a sectional view along the direction of Fig. 5A-A.

Fig. 7 is a cross-sectional view after the installation of the starting device in Embodiment 1 is completed;

Figure 8 is an enlarged view of the structure at A in Figure 7;

Fig. 9 is a sectional view after the installation of the starting device in Embodiment 2 is completed;

Figure 10 is an enlarged view of the structure at A in Figure 9;

Among them: 1. impeller, 11. first installation groove, 12. first groove, 13. second groove, 2. damping rubber, 21. first boss, 22. second boss, 23. extension end, 24. the second mounting groove, 25. annular protrusion, 26. bump, 3. shaft coupling, 4. card, 5. motor shaft.

detailed description

Example 1

As shown in Figures 1 to 3, a permanent magnet synchronous motor starting device with vibration reduction and low noise includes an impeller 1, a vibration damping rubber 2, a coupling 3 and a card 4; the upper part of the impeller 1 is provided with a first installation groove 11. The vibration-damping rubber 2 is provided with a second installation groove 24, the vibration-damping rubber 2 is embedded in the first installation groove 11, and the coupling 3 is arranged in the second installation groove 24 , the card 4 is installed at the opening end of the first installation slot 11 . The inner wall of the second installation groove 24 is provided with an annular protrusion 25 , and the bottom surface of the second installation groove 24 is provided with a convex point 26 concentric with the motor shaft 5 .

Specifically, as shown in Figures 2 to 6, the bottom surface of the first installation groove 11 is provided with a first groove 12, and the bottom surface of the vibration-damping rubber 2 is provided with a groove that matches the first groove 12. The first boss 21. The side wall of the first installation groove 11 is provided with a second groove 13 , and the side wall of the vibration-damping rubber 2 is provided with a second boss 22 matching the second groove 13 . The upper edge of the damping rubber 2 is provided with an extension end 23 , and the extension end 23 is located between the impeller 1 and the lower surface of the card 4 .

As shown in Figures 7 and 8, wherein the shaft coupling 3 is a shaft coupling 3 with openings at both ends. During installation, the motor shaft 5 passes through the shaft coupling 3 and extends into the bottom of the second installation groove 24 of the vibration-damping rubber 2, and the motor The end of the shaft 5 is in point contact with the protrusion 26 on the bottom surface of the second mounting groove 24 , and there is a small amount of interference between the motor shaft 5 and the annular protrusion 25 . During actual operation, the motor shaft 5 will have a small axial movement back and forth. When the motor shaft 5 moves forward, it will touch the bump 26 on the bottom surface of the second installation groove 24. The bump 26 plays a certain buffering role. The bump 26 has a small contact area and is located at the center of rotation. The frictional resistance is small and will not affect the starting. In addition, a small amount of interference between the motor shaft 5 and the annular bump 25 also plays a role in stabilizing and reducing vibration.

Example 2

The difference from Embodiment 1 is that: as shown in Figures 9 and 10, one end of the coupling 3 is open, and when installed, the motor shaft 5 is installed in the coupling 3, and the coupling 3 extends into the first part of the vibration-damping rubber 2. At the bottom of the second installation groove 24, the shaft coupling 3 is in point contact with the convex point 26 on the bottom surface of the second installation groove 24, and there is a small amount of interference between the shaft coupling 3 and the annular protrusion 25, which plays a role of stabilizing and damping. Other structures are with embodiment 1.

It should be understood that the specific embodiments described above are only used to explain the present utility model, and are not intended to limit the present utility model. Obvious changes or changes derived from the spirit of the utility model are still within the protection scope of the utility model.

Claims (8)

1. a permagnetic synchronous motor starting drive for vibration damping low noise, is characterized in that: comprise impeller (1), vibration isolation rubber (2), shaft coupling (3) and card (4); Described impeller (1) top is provided with the first mounting groove (11), described vibration isolation rubber (2) is provided with the second mounting groove (24), described vibration isolation rubber (2) is inlaid in described first mounting groove (11), described shaft coupling (3) is arranged in described second mounting groove (24), and described card (4) is arranged on the openend of described first mounting groove (11).

2. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 1, it is characterized in that: described the first mounting groove (11) bottom surface is provided with the first groove (12), described vibration isolation rubber (2) bottom surface is provided with the first boss (21) matched with described first groove (12).

3. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 1 and 2, it is characterized in that: described the first mounting groove (11) sidewall is provided with the second groove (13), described vibration isolation rubber (2) sidewall is provided with the second boss (22) matched with described second groove (13).

4. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 1, it is characterized in that: described vibration isolation rubber (2) upper end-face edge is provided with elongated end (23), described elongated end (23) is positioned between described impeller (1) and described card (4) lower surface.

5. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 1, is characterized in that: described the second mounting groove (24) inwall is provided with annular protrusion (25).

6. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 5, it is characterized in that: described shaft coupling (3) one end open, motor shaft (5) is arranged in described shaft coupling (3), described shaft coupling (3) and described annular protrusion (25) interference fit.

7. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 5, it is characterized in that: described shaft coupling (3) both ends open, motor shaft (5) stretches into the second mounting groove (24) bottom through described shaft coupling (3), described motor shaft (5) and described annular protrusion (25) interference fit.

8. the permagnetic synchronous motor starting drive of vibration damping low noise according to claim 1, it is characterized in that: described the second mounting groove (24) bottom surface is provided with the salient point (26) concentric with motor shaft (5), motor shaft (5) or between described shaft coupling (3) and described second mounting groove (24) bottom surface by described salient point (26) point cantact.