Silent permanent magnet fan motor

Abstract

The utility model relates to the technical field of motors, and discloses a mute type permanent magnet fan motor, which structurally comprises a permanent magnet motor, a sealing end cover, a motor seat, a main shaft and a composite shell, and has the beneficial effects that noise can be prevented from leaking from gaps of the motor through a rubber sealing ring arranged at the joint of the sealing end cover and a shell of the permanent magnet motor; and the rotation direction of the plurality of spiral sound absorption blocks on the sound insulation layer on the inner wall of the motor shell is the same as that of the fan impeller in the motor, so that the air flow can be guided to flow orderly when the impeller rotates, the original disordered air flow is adjusted into ordered laminar flow, the wind noise is reduced, and the noise reduction effect of the motor is improved. After sound waves enter the grooves of the spiral sound absorption blocks, the propagation path of the sound waves can be lengthened, the sound waves can be reflected in the spiral grooves for multiple times, sound energy of the sound waves can be absorbed by the sound absorption materials, and therefore noise radiated to the outside can be weakened.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a silent permanent magnet fan motor. Background Technology

[0002] Permanent magnet fan motors have been widely used to replace traditional induction motors and are applied in various fan equipment due to their advantages of high power factor, excellent energy efficiency and energy saving. However, with the development of high power fan motors, the noise generated by the motor during operation has become increasingly prominent, becoming a bottleneck restricting their application in scenarios with high requirements for quietness, such as indoor ventilation, precision instrument matching, medical equipment and other places.

[0003] Based on the above, existing permanent magnet fan motors lack an integrated technical solution that combines high-efficiency noise reduction and vibration damping stability. Therefore, there is an urgent need to develop a silent permanent magnet fan motor. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a silent permanent magnet fan motor with the function of noise reduction and vibration reduction of permanent magnet fan motor.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A silent permanent magnet fan motor has a structure including a permanent magnet motor, a sealed end cover, a motor base, and a main shaft. The motor base is installed at the bottom of the permanent magnet motor, a sealed end cover is provided on one side of the permanent magnet motor, and a main shaft is provided at the end of the permanent magnet motor away from the sealed end cover.

[0007] As an optimization, a rubber sealing ring is installed at the connection between the sealing end cap and the housing of the permanent magnet motor.

[0008] As an optimization, the permanent magnet motor includes a composite housing, a stator assembly, a rotor assembly, and a permanent magnet. The rotor assembly and the stator assembly are arranged sequentially from the inside to the outside of the composite housing. The permanent magnet is mounted on the rotor assembly. The rotor assembly is connected to the main shaft, and the stator assembly, the rotor assembly, and the permanent magnet are all enclosed by the composite housing.

[0009] As an optimization, the composite housing includes a sound insulation layer, a protective layer and a vibration damping cavity. The composite housing is provided with a sound insulation layer, a vibration damping cavity and a protective layer in sequence from the inside to the outside. The vibration damping cavity is located between the sound insulation layer and the protective layer, and the three are a composite structure.

[0010] As an optimization, the vibration-damping cavity is filled with a composite layer of high-density sound-absorbing cotton and damping rubber, which can block the transmission of electromagnetic and mechanical noise from inside the permanent magnet motor and absorb the noise generated by the vibration of the shell.

[0011] As an optimization, the inner wall of the sound insulation layer has a ring array of several spiral sound-absorbing blocks, the spiral sound-absorbing blocks are made of sound-absorbing material and are in contact with the stator assembly, and the rotation direction of the spiral sound-absorbing blocks is the same as the rotation direction of the fan impeller inside the permanent magnet motor.

[0012] As an optimization, the protective layer is internally embedded with a honeycomb plate, and the honeycomb holes of the honeycomb plate are filled with sound-absorbing particles.

[0013] As an optimization, the motor base includes an upper connecting plate, a lower support frame, spring damping, and buffer vibration feet. The top of the upper connecting plate is installed at the bottom of the permanent magnet motor, and the lower support frame is located directly below the upper connecting plate. The upper connecting plate and the lower support frame are connected by a spring assembly and buffer vibration feet. The buffer vibration foot array is installed at the four-legged connection nodes between the lower support frame and the upper connecting plate.

[0014] As an optimization, the upper connecting plate includes hollow holes and socket grooves. The upper connecting plate has several hollow holes on its body and socket grooves on its four connecting corners, which are engaged with the buffer vibration foot through the socket grooves.

[0015] As an optimization, snap-fit ​​sleeves are provided at all four corners of the lower support frame, which are used to snap-fit ​​with the buffer vibration foot.

[0016] As an optimization, the buffer foot is made of rubber.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] (1) The silent permanent magnet fan motor of this utility model has a rubber sealing ring installed at the junction of the sealing end cover and the housing of the permanent magnet motor. The general rubber sealing ring can prevent noise from leaking from the gap of the motor and improve the noise reduction and quietness of the motor.

[0019] (2) The silent permanent magnet fan motor of this utility model adds a sound insulation layer to the inner wall of the motor housing. With the help of the rotation direction of several spiral sound-absorbing blocks on the sound insulation layer being the same as the rotation direction of the fan impeller inside the motor, the airflow during impeller rotation can be guided to flow in an orderly manner, adjusting the originally chaotic airflow into an orderly laminar flow, reducing wind noise. Moreover, after the sound wave enters the groove of the spiral sound-absorbing block, the propagation path of the sound wave will be lengthened and it will be reflected multiple times in the spiral groove. Its sound energy will be absorbed by the sound-absorbing material, thereby reducing the noise radiated to the outside.

[0020] (3) The silent permanent magnet fan motor of this utility model has a protective layer added to the inner wall of the motor housing. With the help of the honeycomb plate embedded in the protective layer, the structural strength of the motor housing can be improved. The honeycomb holes of the honeycomb plate are filled with sound-absorbing particles, which work together with the sound insulation layer and the rubber sealing ring on the sealing end cover to form an all-round sound insulation and vibration reduction closed loop, thereby improving the noise reduction effect of the motor.

[0021] (4) The silent permanent magnet fan motor of this utility model has a shock-absorbing cavity between the sound insulation layer and the protective layer, and a composite layer formed by high-density sound-absorbing cotton and damping rubber is filled inside. This can block the transmission of electromagnetic noise and mechanical noise inside the permanent magnet motor, and absorb the noise generated by the vibration of the shell.

[0022] (5) The silent permanent magnet fan motor of this utility model has a motor base added to the bottom of the motor. With the help of four sets of rubber buffer feet arranged in an array, and the spring damping, it forms a multi-point support at the four corners and the center. This allows the vibration generated by the motor to be directly absorbed by the nearby components, avoiding the spread to the edge and reducing the noise generated by the vibration when the motor is running. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the silent permanent magnet fan motor of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the permanent magnet motor of this utility model;

[0025] Figure 3 This utility model Figure 2 A magnified view of part A in the image;

[0026] Figure 4 This is a schematic diagram of the sound insulation layer of this utility model;

[0027] Figure 5 This is a schematic diagram of the protective layer of this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the motor mount of this utility model;

[0029] Figure 7 This is an exploded view of the motor mount of this utility model.

[0030] The attached diagrams are labeled as follows: Permanent magnet motor-1, Sealed end cap-2, Motor base-3, Main shaft-4, Composite housing-5, Stator assembly-6, Rotor assembly-7, Permanent magnet-8, Sound insulation layer-11, Protective layer-12, Vibration damping cavity-13, Spiral sound-absorbing block-111, Honeycomb clamp-121, Sound-absorbing particles-122, Upper connecting plate-31, Lower support frame-32, Spring damping-33, Buffer vibration foot-34, Hollow hole-311, Sleeve groove-312, Snap-fit ​​sleeve-321. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-7 The silent permanent magnet fan motor has a structure including a permanent magnet motor 1, a sealed end cover 2, a motor base 3 and a main shaft 4. The bottom of the permanent magnet motor 1 is equipped with a motor base 3 that can support the motor. One side of the permanent magnet motor 1 is provided with a sealed end cover 2 that can wrap the fan inside the motor. The end of the permanent magnet motor 1 away from the sealed end cover 2 is provided with a main shaft 4, which is connected to the fan.

[0033] In this embodiment, a rubber sealing ring is installed at the junction of the sealing end cover 2 and the housing of the permanent magnet motor 1. The universal rubber sealing ring can prevent noise from leaking from the gaps in the motor.

[0034] In this embodiment, the permanent magnet motor 1 includes a composite housing 5, a stator assembly 6, a rotor assembly 7, and a permanent magnet 8. The rotor assembly 7 and the stator assembly 6 are arranged sequentially from the inside to the outside inside the composite housing 5. The permanent magnet 8 is mounted on the rotor assembly 7. The rotor assembly 7 is connected to the main shaft 4, and the stator assembly 6, the rotor assembly 7, and the permanent magnet 8 are all enclosed by the composite housing 5.

[0035] In this embodiment, the composite housing 5 includes a sound insulation layer 11, a protective layer 12, and a vibration damping cavity 13. The composite housing 5 is provided with the sound insulation layer 11, the vibration damping cavity 13, and the protective layer 12 in sequence from the inside to the outside. The vibration damping cavity 13 is located between the sound insulation layer 11 and the protective layer 12, and the three are a composite structure.

[0036] In this embodiment, the vibration damping cavity 13 is filled with a composite layer of high-density sound-absorbing cotton and damping rubber, which can block the transmission of electromagnetic and mechanical noise inside the permanent magnet motor 1 and absorb the noise generated by the vibration of the shell.

[0037] In this embodiment, a plurality of spiral sound-absorbing blocks 111 are arranged in a ring on the inner wall of the sound insulation layer 11. The spiral sound-absorbing blocks 111 are made of sound-absorbing material and are in contact with the stator assembly 6. The rotation direction of the spiral sound-absorbing blocks 111 is the same as the rotation direction of the impeller inside the permanent magnet motor 1. This can guide the airflow during impeller rotation to flow in an orderly manner, adjusting the originally turbulent airflow into an orderly laminar flow, reducing wind noise. After the sound wave enters the groove of the spiral sound-absorbing block 111, the propagation path of the sound wave will be lengthened and it will be reflected multiple times in the spiral groove. Its sound energy will be absorbed by the sound-absorbing material, thereby reducing the noise radiated to the outside.

[0038] In this embodiment, a honeycomb plate 121 is embedded inside the protective layer 12. The honeycomb plate 121 can improve the structural strength of the composite housing 5. The honeycomb holes of the honeycomb plate 121 are filled with sound-absorbing particles 122, which work together with the sound insulation layer 11 and the rubber sealing ring on the sealing end cover 2 to form an all-round sound insulation and vibration reduction closed loop, thereby improving the noise reduction effect of the motor.

[0039] In this embodiment, the motor base 3 includes an upper connecting plate 31, a lower support frame 32, a spring damper 33, and a buffer vibration foot 34. The top of the upper connecting plate 31 is installed at the bottom of the permanent magnet motor 1, and the lower support frame 32 is provided directly below the upper connecting plate 31. The upper connecting plate 31 and the lower support frame 32 are connected by the spring damper 33 and the buffer vibration foot 34. The buffer vibration foot 34 is arrayed and installed at the four-legged connection nodes between the lower support frame 32 and the upper connecting plate 31.

[0040] In this embodiment, the upper connecting plate 31 includes a hollow hole 311 and a socket groove 312. The upper connecting plate 31 has a plurality of hollow holes 311 on its body. The hollow holes 311 can improve air circulation, so that the heat generated by the permanent magnet motor 1 during operation can be quickly dissipated through convection, avoiding the impact of high temperature on the motor's life and accuracy. The upper connecting plate 31 has socket grooves 312 on its four connecting corners, which are engaged with the buffer vibration foot 34 through the socket grooves 312.

[0041] In this embodiment, snap-fit ​​sleeves 321 are provided at the four corners of the lower support frame 32, and the snap-fit ​​sleeves 321 are snapped into the buffer vibration foot 34.

[0042] In this embodiment, the damping foot 34 is made of rubber. In cooperation with the spring damper 33, it forms a multi-point support at the four corners and the center, so that the vibration generated by the permanent magnet motor 1 is directly absorbed by the nearest component, avoiding the spread to the edge and reducing the noise generated by the vibration when the motor is running.

[0043] Working principle: When the permanent magnet fan motor is in use, the sealing end cover 2 installed on one side of the permanent magnet motor 1 wraps the composite housing 5 of the motor. Under the sealing effect of the rubber sealing ring, the transmission of noise can be reduced.

[0044] Then, by means of the rotation direction of several spiral sound-absorbing blocks 111 on the inner wall of the sound insulation layer 11 inside the composite casing 5, which is the same as the rotation direction of the fan impeller, the airflow during the impeller rotation can be guided to flow in an orderly manner, adjusting the originally turbulent airflow into an orderly laminar flow, reducing wind noise. Moreover, after the sound waves enter the groove of the spiral sound-absorbing block 111, the propagation path of the sound waves will be lengthened and reflected multiple times in the spiral groove, thereby reducing the noise radiated to the outside.

[0045] Furthermore, the motor base 3 at the bottom, with the help of four sets of rubber buffer feet 34 arranged in an array, works in conjunction with the spring damping 33 to form multi-point support at the four corners and the center. This allows the vibration generated by the permanent magnet motor 1 to be directly absorbed by the nearest components, preventing it from spreading to the edges and reducing the noise generated by the vibration when the motor is running.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silent permanent magnet fan motor, the structure of which includes a permanent magnet motor (1), a motor base (3) located at the bottom of the permanent magnet motor (1), a sealing end cover (2) located on one side of the permanent magnet motor (1), and a main shaft (4) located at the end of the permanent magnet motor (1) away from the sealing end cover (2). The permanent magnet motor (1) includes a composite housing (5), a stator assembly (6), a rotor assembly (7) and a permanent magnet (8). The rotor assembly (7) and the stator assembly (6) are arranged sequentially from the inside to the outside of the composite housing (5). The permanent magnet (8) is mounted on the rotor assembly (7). Its features are: The composite housing (5) includes a sound insulation layer (11), a protective layer (12), and a vibration damping cavity (13). The composite housing (5) is provided with a sound insulation layer (11), a vibration damping cavity (13), and a protective layer (12) from the inside to the outside. The vibration damping cavity (13) is located between the sound insulation layer (11) and the protective layer (12), and the three are a composite structure. The inner wall of the sound insulation layer (11) has a ring array of a number of spiral sound-absorbing blocks (111). The spiral sound-absorbing blocks (111) are made of sound-absorbing material and are in contact with the stator assembly (6). The rotation direction of the spiral sound-absorbing blocks (111) is the same as the rotation direction of the fan impeller inside the permanent magnet motor (1). The protective layer (12) has a honeycomb plate (121) embedded inside, and the honeycomb holes of the honeycomb plate (121) are filled with sound-absorbing particles (122). The motor base (3) includes an upper connecting plate (31), a lower support frame (32), a spring damper (33), and a buffer foot (34). The top of the upper connecting plate (31) is installed at the bottom of the permanent magnet motor (1). The lower support frame (32) is located directly below the upper connecting plate (31). The upper connecting plate (31) and the lower support frame (32) are connected by the spring damper (33) and the buffer foot (34). The buffer foot (34) is arrayed and installed at the four-leg connection nodes between the lower support frame (32) and the upper connecting plate (31). The vibration damping cavity (13) is filled with a composite layer of high-density sound-absorbing cotton and damping rubber; The upper connecting plate (31) includes a hollow hole (311) and a socket groove (312). The upper connecting plate (31) has several hollow holes (311) on its body. The upper connecting plate (31) has socket grooves (312) on its four connecting corners. The socket grooves (312) are engaged with the buffer vibration foot (34).

2. The silent permanent magnet fan motor according to claim 1, characterized in that: A rubber sealing ring is installed at the junction of the sealing end cap (2) and the housing of the permanent magnet motor (1).

3. The silent permanent magnet fan motor according to claim 1, characterized in that: The lower support frame (32) is provided with snap-fit ​​sleeves (321) at all four corners, which are snap-fitted to the buffer foot (34).

4. The silent permanent magnet fan motor according to claim 1, characterized in that: The buffer foot (34) is made of rubber and works in conjunction with the spring damper (33) to form multi-point support at the four corners and the center.

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