A brushless DC motor with good sound insulation effect

Abstract

The present invention relates to the technical field of brushless DC motors, and specifically relates to a brushless DC motor with good sound insulation effect, including a motor housing with a cavity inside and a stator fixedly connected to the cavity thereof. A rotor adapted to the stator is arranged in the cavity of the motor housing, and shafts fixedly connected to both ends thereof. Bearings connected to both ends of the motor housing are fixedly connected to both ends of the shafts. A plurality of buffer seats are fixedly connected to both ends of the motor housing respectively. A plurality of sliding rods are slidably connected inside the plurality of buffer seats. Connection blocks fixedly connected to the outer surface of the bearings are fixedly connected to the bottoms of the plurality of sliding rods. A shock absorption assembly for buffering the connection blocks is arranged inside the buffer seats. An auxiliary housing is fixedly connected to one side of the motor housing, and a sound insulation assembly is arranged inside the auxiliary housing. Through the offset of the bearings, the movement of the connection blocks and rubber rings, the inhibitory effect of the disc springs, and the expansion of the elastic tabs driven by gas, a multi-level resonance suppression mechanism is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless DC motors, and specifically to a brushless DC motor with good silent effect. Background Art

[0002] With the continuous development of technology and the expansion of application fields, brushless DC motors (BLDC) have been widely used in many fields such as industrial automation, power tools, household appliances, and electric vehicles due to their advantages of high efficiency, long life, and low maintenance cost. However, with the continuous improvement of users' requirements for product performance and quality, especially in terms of noise control, traditional brushless DC motors can no longer meet the market demand. When a traditional brushless DC motor is running, due to the influence of various factors such as the vibration of the internal structure of the motor, electromagnetic noise, and air flow noise, a relatively large amount of noise will be generated. This not only affects the user experience but also limits the application of brushless DC motors in noise-sensitive fields.

[0003] For example, in the patent application with the publication number CN115864720A in the prior art, this application provides a brushless DC motor with good silent effect, which relates to the technical field of brushless DC motors. It includes a housing, a rotating shaft is rotatably installed on the inner wall of the housing, a rotor is fixedly installed on the side wall of the rotating shaft, a coating device is provided on the surface of the housing. The coating device includes a telescopic tube with a storage structure, a fixed tube, and a connecting tube, a fixing strip and a sleeve with a limiting function, a limiting groove and an arc groove with a guiding function. The arc groove is opened on the side wall of the rotating shaft, and several limiting grooves are evenly opened on the inner side of the housing. By setting the coating device, this application facilitates the coating of lubricant at the connection between the rotating shaft and the housing, reduces the friction between the metal of the housing and the rotating shaft, and reduces the phenomenon that due to the fact that both the rotating shaft and the housing are made of metal materials, if not lubricated for a long time, relatively large friction noise between metals is likely to occur, thereby generating a certain amount of noise, and as much as possible improves the silent effect of the brushless DC motor.

[0004] Although the above-mentioned prior art does facilitate the coating of lubricant at the connection between the rotating shaft and the housing through the setting of the coating device to reduce the noise generated by friction, in actual applications, there is an important source of noise, that is, when the rotational speed of the rotor of the brushless motor reaches a certain frequency, resonance will occur between the rotor and the stator. Although the lubricant can reduce the noise generated by friction, the lubricant has almost no inhibitory effect on the noise generated by resonance because the resonance noise is caused by vibration rather than simple friction noise. This resonance phenomenon will not only cause violent vibration between the rotor and the stator but also be transmitted to the housing through various components of the motor, thereby forming strong noise. Therefore, this application proposes a brushless DC motor with good silent effect. Summary of the Invention

[0005] The object of the present invention is to provide a brushless DC motor with good sound insulation effect to solve the problems proposed in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: A brushless DC motor with good sound insulation effect, including a casing with a cavity inside and a stator fixedly connected in its cavity. A rotor adapted to the stator is arranged in the cavity of the casing, and shafts fixedly connected to both ends thereof. Bearings connected to both ends of the casing are fixedly connected to both ends of the shaft. A plurality of buffer seats are fixedly connected to both ends of the casing respectively. A plurality of sliding rods are slidably connected inside each of the plurality of buffer seats. Connecting blocks fixedly connected to the outer surface of the bearing are fixedly connected to the bottoms of the plurality of sliding rods. A shock absorption assembly for buffering the connecting blocks is arranged inside the buffer seats. An auxiliary casing is fixedly connected to one side of the casing, and a sound absorption assembly is arranged inside the auxiliary casing.

[0007] Preferably, the shock absorption assembly includes a movable cavity opened inside the buffer seat. A disc spring is fixedly connected inside the movable cavity. A support plate is fixedly connected to the outer surface of the sliding rod. A rubber ring that abuts against the disc spring is fixedly connected to the top of the support plate.

[0008] Preferably, a rubber wall that contacts the outer surface of the rubber ring is fixedly connected inside the movable cavity. A plurality of elastic convex pieces are uniformly fixedly connected to the outer surface of the rubber ring.

[0009] Preferably, an air cavity is constructed inside the rubber ring. An air delivery groove is opened inside the sliding rod, and the air delivery groove communicates with the rubber ring through the support plate. An extension rod is fixedly connected inside the buffer seat. A piston adapted to the inside of the sliding rod is fixedly connected to the bottom of the extension rod.

[0010] Preferably, the plurality of elastic convex pieces are made of elastic materials, and the inside of each of the plurality of elastic convex pieces communicates with the air cavity of the rubber ring.

[0011] Preferably, the sound absorption assembly includes a support ring fixedly connected inside the auxiliary casing. A plurality of sound absorption cylinders communicated with the support ring are fixedly connected to the outer surface of the support ring. The inside of each of the plurality of sound absorption cylinders is constructed with glass wool for sound absorption.

[0012] Preferably, a wind guide plate is arranged inside the auxiliary casing. One end of the wind guide plate is fixedly connected to one end of the support ring. Centrifugal heat dissipation blades are uniformly fixedly connected to the outer surface of the shaft located inside the wind guide plate.

[0013] Preferably, a plurality of foam plastic inclined plates are uniformly fixedly connected inside each of the plurality of sound absorption cylinders. The bottoms of the plurality of foam plastic inclined plates are all constructed as inclined surfaces.

[0014] Preferably, a movable shaft is rotatably connected inside the plurality of muffling cylinders and below the plurality of foam plastic inclined plates, and a plurality of air baffles for restricting air flow are fixedly connected to the outer surface of the movable shaft.

[0015] Preferably, rolling grooves are formed inside the plurality of air baffles, and gravity balls are slidably connected inside the plurality of rolling grooves.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. When the rotor speed reaches a certain frequency, the resonance generated will be transmitted to the bearing through the shaft, thereby affecting the stability of the entire system. Through the offset of the bearing, the movement of the connecting block and the rubber ring, the damping effect of the disc spring, and the expansion of the elastic tab driven by gas, a multi-level resonance suppression mechanism is formed. When the shaft generates relatively strong vibrations, it can adaptively adjust the damping force. Through the movement of the sliding rod on the surface of the piston, the piston pushes the gas into the rubber ring, causing the rubber ring to bulge and pushing the elastic tab to expand, thereby increasing the friction coefficient between the rubber ring and the rubber wall, further suppressing vibrations. At the same time, the friction between the disc spring and the rubber ring and the rubber wall serves as a double damping mechanism. The disc spring can directly suppress vibrations, while the friction between the rubber ring and the rubber wall provides an additional damping effect. The combined action of the two can more effectively suppress the vibrations generated by resonance. This self-adaptability enables the system to adapt to vibration conditions under different working conditions and provide more stable and reliable performance.

[0018] 2. With the rotation of the rotor by the centrifugal heat dissipation blades, the airflow formed in the air guiding plate can effectively take away the heat inside the casing, improving the heat dissipation efficiency. When the airflow and noise are guided into the inner part of the guiding ring and then enter the muffling cylinder, the noise can be centrally processed, improving the noise elimination efficiency. The multi-layer structure inside the muffling cylinder (including the air baffle, movable shaft, and foam plastic inclined plate) can gradually slow down the flow rate of the airflow, enabling the noise in the airflow to fully contact the foam plastic inclined plate, thereby achieving noise elimination. The air baffle allows the airflow and noise to pass through gradually rather than all at once, which can more effectively control the noise elimination process and avoid incomplete noise elimination caused by passing through all at once. The muffling cylinder enables the noise in the airflow to be fully eliminated when passing through the air baffle and the foam plastic inclined plate, reducing the noise level and providing a quieter working environment. The gravity balls and the rolling grooves cause the air baffle to be subjected to a downward force when rotating, thereby slowing down the rotation speed of the air baffle, further controlling the airflow and noise passing through the air baffle, and enabling continuous noise elimination. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2Schematic cross-sectional structure diagram of the present invention;

[0021] Figure 3 Schematic partial cross-sectional structure diagram of the casing in the present invention;

[0022] Figure 4 Of the present invention Figure 3 Schematic enlarged structure diagram of part A therein;

[0023] Figure 5 Schematic cross-sectional structure diagram of the buffer seat in the present invention;

[0024] Figure 6 Schematic exploded structure diagram of the shock absorption assembly in the present invention;

[0025] Figure 7 Schematic cross-sectional structure diagram of the sliding rod in the present invention;

[0026] Figure 8 Schematic cross-sectional structure diagram of the rubber ring in the present invention;

[0027] Figure 9 Schematic cross-sectional structure diagram of the auxiliary casing in the present invention;

[0028] Figure 10 Schematic exploded structure diagram of the air deflector and the centrifugal heat dissipation blades in the present invention;

[0029] Figure 11 Schematic cross-sectional structure diagram of the silencing cylinder in the present invention;

[0030] Figure 12 Schematic structure diagram of the baffle in the present invention.

[0031] In the figure: 100, casing; 101, stator; 102, shaft; 103, rotor; 104, bearing; 200, buffer seat; 201, sliding rod; 202, connecting block; 203, support plate; 204, rubber ring; 205, disc spring; 206, movable cavity; 207, rubber wall; 208, extension rod; 209, piston; 210, air delivery groove; 211, elastic tab; 300, auxiliary casing; 301, air deflector; 302, centrifugal heat dissipation blade; 303, support ring; 304, silencing cylinder; 305, foam plastic inclined plate; 306, movable shaft; 307, baffle; 308, rolling groove; 309, gravity ball. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1: Please refer to Figure 1 , Figure 3 and Figure 4 , the present invention provides a technical solution: a brushless DC motor with good sound insulation effect, including a housing 100 with a cavity inside and a stator 101 fixedly connected to its cavity. The stator 101 consists of one or more coil windings, which are precisely arranged inside the motor to form one or more magnetic poles. When current passes through these windings, they will generate a magnetic field. A rotor 103 adapted to the stator 101 is arranged in the cavity of the housing 100. The rotor 103 is made of permanent magnet material, and these permanent magnets are precisely arranged on the rotor to form magnetic poles that interact with the magnetic field of the stator 101, and a shaft 102 fixedly connected to both ends thereof. At the same time, it also includes a controller that receives signals from the outside and controls the rotation speed and direction of the motor by changing the direction and magnitude of the current in the stator winding. This is the prior art and will not be elaborated here. Both ends of the shaft 102 are fixedly connected with bearings 104 connected to both ends of the housing 100. The bearings 104 support the shaft 102. A plurality of buffer seats 200 are fixedly connected to both ends of the housing 100 respectively. A plurality of sliding rods 201 are slidably connected inside the plurality of buffer seats 200. A connecting block 202 fixedly connected to the outer surface of the bearing 104 is fixedly connected to the bottom of the plurality of sliding rods 201. The connecting block 202 can be detachably connected to the outer surface of the bearing 104 for fixing the bearing 104. At the same time, the buffer seat 200 supports the sliding rod 201. A shock absorption component for buffering the connecting block 202 is arranged inside the buffer seat 200. By setting the shock absorption component, the vibration generated when the shaft 102 rotates can be suppressed, thereby reducing noise.

[0034] Among them, when the rotation speed of the rotor 103 reaches a certain frequency, resonance will occur between the rotor 103 and the stator 101, forming noise. To suppress the vibration received by the bearing 104, please refer to Figure 5 , Figure 6 and Figure 7The shock absorbing assembly includes an active cavity 206 opened inside the buffer seat 200, a spring disc 205 is fixedly connected inside the active cavity 206, a support plate 203 is fixedly connected to the outer surface of the slide bar 201, a rubber ring 204 that contacts the spring disc 205 is fixedly connected to the top of the support plate 203, a rubber wall 207 that contacts the outer surface of the rubber ring 204 is fixedly connected inside the active cavity 206, and a plurality of elastic protrusions 211 are evenly fixedly connected to the outer surface of the rubber ring 204. The spring disc 205 can be used to buffer the vibration of the connecting block 202, and the plurality of connecting blocks 202 are presented on the outer surface of the bearing 104 in a triangular divergent manner, so that when the bearing 104 is subjected to vibration in all directions, the three connecting blocks 202 can play a role in buffering the bearing 104, and the mutual cooperation between the rubber ring 204 and the rubber wall 207 can further increase the damping force when the slide bar 201 slides, thereby further suppressing the amplitude of the vibration of the spring disc 205 and absorbing the kinetic energy generated by the vibration.

[0035] Furthermore, since the vibration intensity to which the bearing 104 is subjected is not fixed, in order to make the fit between the rubber ring 204 and the rubber wall 207 match the vibration force to which the bearing 104 is subjected, an air cavity is constructed inside the rubber ring 204, an air delivery groove 210 is opened inside the slide bar 201, and the air delivery groove 210 is connected to the rubber ring 204 through the support plate 203, an extension rod 208 is fixedly connected inside the buffer seat 200, and a piston 209 adapted to the inside of the slide bar 201 is fixedly connected to the bottom of the extension rod 208, wherein when the bearing 104 is subjected to greater vibration, it will further push the slide bar 201 to produce displacement, and at this time the piston 209 will push the gas in the slide bar 201 to be transported to the inside of the rubber ring 204, compensating for the multiple elastic protrusions 211, so that the expansion further increases the damping force between the rubber ring 204 and the rubber wall 207, thereby improving its ability to absorb vibration force, thereby further suppressing vibration.

[0036] It is worth mentioning that Figure 8 As shown, the multiple elastic protrusions 211 are made of elastic material, and the interiors of the multiple elastic protrusions 211 are connected to the air cavity of the rubber ring 204. The multiple elastic protrusions 211 are made of elastic material, so that when the vibration is small, they shrink, thereby maintaining the original damping force between the rubber ring 204 and the rubber wall 207.

[0037] Specifically, when the rotational speed of the rotor 103 reaches a certain frequency, resonance will occur between the rotor 103 and the shaft 102 and be transmitted to the shaft 102, thereby generating noise. To suppress the resonance received by the shaft 102, when the shaft 102 vibrates, it will drive the bearing 104 to shift. At this time, when the bearing 104 shifts, it will cause the connecting block 202 to move, thus pushing the rubber ring 204 to move on the surface of the rubber wall 207 and simultaneously compressing the disc spring 205. At this time, the disc spring 205 will suppress the vibration received by the slide bar 201. At the same time, the interaction between the rubber ring 204 and the rubber wall 207 will generate a large frictional force, thereby generating damping to assist the disc spring 205. When the shaft 102 generates a relatively strong vibration, the slide bar 201 will receive a greater force, thus driving the slide bar 201 to move a certain distance on the surface of the piston 209. At this time, the piston 209 will push the gas in the slide bar 201 through the air delivery groove 210 to be delivered into the rubber ring 204. At this time, the gas in the rubber ring 204 gradually increases, causing it to bulge and pushing multiple elastic tabs 211 to expand, thereby increasing the friction coefficient between the rubber ring 204 and the rubber wall 207 and further suppressing the vibration of the connecting block 202. After the vibration is suppressed, the slide bar 201 will also reset, causing the multiple elastic tabs 211 to reset.

[0038] In summary, when the rotational speed of the rotor 103 reaches a certain frequency, the generated resonance will be transmitted to the bearing 104 through the shaft 102, thereby affecting the stability of the entire system. Through the shift of the bearing 104, the movement of the connecting block 202 and the rubber ring 204, the suppression effect of the disc spring 205, and the expansion of the gas-driven elastic tabs 211, a multi-level resonance suppression mechanism is formed. When the shaft 102 generates a relatively strong vibration, it can adaptively adjust the damping force. Through the movement of the slide bar 201 on the surface of the piston 209, the piston pushes the gas into the rubber ring 204, causing the rubber ring to bulge and pushing the elastic tabs 211 to expand, thereby increasing the friction coefficient between the rubber ring and the rubber wall, further suppressing the vibration. At the same time, the friction between the disc spring 205 and the rubber ring 204 and the rubber wall 207 serves as a dual damping mechanism. The disc spring 205 can directly suppress the vibration, while the friction between the rubber ring 204 and the rubber wall 207 provides an additional damping effect. The two work together to more effectively suppress the vibration generated by resonance. This adaptability enables the system to adapt to the vibration conditions under different working conditions and provide more stable and reliable performance.

[0039] Embodiment 2: Please refer to Figure 2 、 Figure 9 and Figure 11, based on the previous embodiment, the present invention also provides a technical solution: a brushless DC motor with good sound insulation effect. One side of the housing 100 is fixedly connected with an auxiliary housing 300. An acoustic damping component is arranged inside the auxiliary housing 300. The acoustic damping component includes a support ring 303 fixedly connected to the inside of the auxiliary housing 300. A plurality of sound damping cylinders 304 communicated with the support ring 303 are fixedly connected to the outer surface of the support ring 303. The interiors of the plurality of sound damping cylinders 304 are all constructed with glass wool for sound absorption. In order to further suppress the spread of noise, the sound damping cylinders 304 are provided to perform sound damping treatment on the noise generated inside the housing 100, thereby reducing the spread of noise to the outside.

[0040] Among them, please refer to Figure 9 , Figure 10 and Figure 11 , in order to further direct the noise and at the same time increase the residence time of the noise in the sound damping cylinder 304, thereby improving its sound damping effect, a wind guiding plate 301 is arranged inside the auxiliary housing 300. One end of the wind guiding plate 301 is fixedly connected to one end of the support ring 303. Centrifugal heat dissipation blades 302 are uniformly fixedly connected to the outer surface of the shaft 102 located inside the wind guiding plate 301. A plurality of foam plastic inclined plates 305 are uniformly fixedly connected to the interiors of the plurality of sound damping cylinders 304. The bottoms of the plurality of foam plastic inclined plates 305 are all constructed as inclined surfaces. The inclined surfaces of the plurality of foam plastic inclined plates 305 can block the rapid flow of noise and air, thereby increasing the residence time of the noise in the sound damping cylinder 304. At the same time, the centrifugal heat dissipation blades 302 can generate suction to direct the air, so that the air flow carries the noise into the interior of the sound damping cylinder 304 together. At the same time, the sound damping cylinder 304 can dissipate heat from the inside of the housing 100.

[0041] Furthermore, please refer to Figure 11 and Figure 12 , in order to further slow down the rate of noise passing through the interior of the sound damping cylinder 304, a movable shaft 306 is rotatably connected inside the plurality of sound damping cylinders 304 and below the plurality of foam plastic inclined plates 305. A plurality of baffles 307 for restricting air flow are fixedly connected to the outer surface of the movable shaft 306. A rolling groove 308 is formed inside each of the plurality of baffles 307. A gravity ball 309 is slidably connected inside each of the plurality of rolling grooves 308. The rotation of the baffles 307 together with the movable shaft 306 can effectively slow down the fluidity of the gas passing quickly through the sound damping cylinder 304, thereby slowing down the rapid passage of the gas through the sound damping cylinder 304. The gravity ball 309 rolls continuously in the rolling groove 308 and applies a reaction force to the baffle 307, thereby suppressing the rapid rotation of the baffle 307 due to inertia.

[0042] Specifically, when the rotor 103 rotates, it will drive the centrifugal heat dissipation blades 302 to rotate in the air guide plate 301 to form an airflow, so that the heat and noise in the housing 100 follow the guidance of the air guide plate 301 and enter the inside of the support ring 303. At this time, the airflow carrying noise is disturbed by the centrifugal heat dissipation blades 302 and flows toward the inner wall of the support ring 303, and then enters the inside of the multiple silencers 304. When the airflow and noise enter the inside of the multiple silencers 304 respectively, they will first impact the surfaces of the multiple baffles 307. At this time, the baffles 307 are impacted to rotate the transmission movable shaft 306, thereby gradually opening the channel inside the silencer 304. At this time, a certain amount of airflow and noise enter the silencer 304. , and the airflow is blocked by the baffle 307 and its flow speed will be slowed down. At the same time, it will then encounter multiple foam plastic inclined plates 305 to further slow down its flow rate, so that the noise in the airflow is fully in contact with the multiple foam plastic inclined plates 305 and silenced. When the movable shaft 306 rotates, the gravity ball 309 inside the baffle 307 will continuously slide on the inner wall of the rolling groove 308. Under the interaction of centrifugal force and gravity, it will apply a downward swinging force to the baffle 307, thereby slowing down the force of the movable shaft 306 that continues to rotate due to inertia, so that the baffle 307 keeps rotating at a relatively slow speed, thereby controlling the airflow and noise passing through the baffle 307, and continuously silencing the noise.

[0043] In summary, as the centrifugal heat dissipation blades 301 rotate with the rotor 103, the airflow formed in the air guide plate 301 can effectively take away the heat in the housing 100, thereby improving the heat dissipation efficiency. When the airflow and noise are guided to the inside of the support ring 303 and then enter the silencer 304, the noise can be centrally processed, thereby improving the efficiency of voice elimination. The multi-layer structure inside the silencer 304 (including the baffle 307, the movable shaft 306, and the foam plastic inclined plate 305) can gradually slow down the flow speed of the airflow, so that the noise in the airflow is fully in contact with the foam plastic inclined plate 305, thereby achieving noise elimination. The baffle 307 allows the airflow and noise to pass through gradually instead of all at once, which can more effectively control the noise elimination process and avoid incomplete noise elimination caused by one-time passage. The silencer 304 allows the noise in the airflow to be fully eliminated when passing through the baffle 307 and the foam plastic inclined plate 305, thereby reducing the noise level and providing a quieter working environment. The gravity ball 309 and the rolling groove 308 cause the baffle 307 to be subjected to a downward force when rotating, thereby slowing down the rotation speed of the baffle 307, further controlling the airflow and noise passing through the baffle 307, and continuously silencing the noise.

[0044] Working principle: By controlling the driver to perform electronic commutation technology to control the commutation of the current of the stator 101, the rotation of the rotor 103 is driven. At this time, when the rotor 103 rotates, the shafts 102 on both sides of it will also rotate together. The rotor 103 will drive the centrifugal heat dissipation blades 302 to rotate inside the air guide plate 301, so as to form an air flow to absorb heat from the inside of the casing 100. At the same time, a certain amount of noise will be generated when the rotor 103 and the stator 101 work. This noise will be transmitted along with the air flow and then enter the inside of the air guide plate 301 and then be guided into the inside of the guide ring 303. At this time, the air flow carrying the noise is disturbed by the centrifugal heat dissipation blades 302 and flows towards the inner wall of the guide ring 303, and then enters the inside of a plurality of muffler cylinders 304. When the air flow and the noise enter the inside of the plurality of muffler cylinders 304 respectively, they will first impact on the surfaces of a plurality of baffles 307. At this time, the baffles 307 are impacted and will drive the movable shaft 306 to rotate, so as to gradually open the channel inside the muffler cylinder 304. At this time, a certain amount of air flow and noise enter the inside of the muffler cylinder 304. The air flow is blocked by the baffle 307 and its flow rate will be slowed down. At the same time, it will then encounter a plurality of foam plastic inclined plates 305, which will further slow down its flow rate, so that the noise in the air flow can fully contact with the plurality of foam plastic inclined plates 305 to eliminate the noise. When the movable shaft 306 rotates, the gravity balls 309 inside the baffle 307 will continuously slide on the inner wall of the rolling groove 308. Under the interaction of centrifugal force and gravity, a force will be applied to the baffle 307 to swing downward, so as to slow down the force of the movable shaft 306 rotating continuously due to inertia, so that the baffle 307 rotates at a relatively slow rate, so as to control the air flow and noise passing through the baffle 307 and continuously eliminate the noise;

[0045] Meanwhile, when the rotational speed of the rotor 103 reaches a certain frequency, resonance will occur between the rotor 103 and the shaft 102 and be transmitted to the shaft 102, thus generating noise. To suppress the resonance received by the shaft 102, when the shaft 102 vibrates, it will drive the bearing 104 to shift. At this time, when the bearing 104 shifts, it will cause the connecting block 202 to move, thereby pushing the rubber ring 204 to move on the surface of the rubber wall 207 and simultaneously compressing the disc spring 205. At this time, the disc spring 205 will suppress the vibration received by the slide bar 201. Meanwhile, the mutual cooperation between the rubber ring 204 and the rubber wall 207 will generate a large frictional force, thus generating damping to assist the disc spring 205. When the shaft 102 generates a relatively strong vibration, the slide bar 201 will receive a greater force, thereby driving the slide bar 201 to move a certain distance on the surface of the piston 209. At this time, the piston 209 will push the gas inside the slide bar 201 to be transported to the inside of the rubber ring 204 through the air delivery groove 210. At this time, the gas inside the rubber ring 204 gradually increases, causing it to bulge and pushing the multiple elastic tabs 211 to expand, thereby increasing the friction coefficient between the rubber ring 204 and the rubber wall 207 and further suppressing the vibration of the connecting block 202. After suppressing the vibration, the slide bar 201 will also reset, causing the multiple elastic tabs 211 to reset and maintaining the friction coefficient between the rubber ring 204 and the rubber wall 207 in the initial state.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A brushless DC motor with good sound insulation effect, comprising a housing (100) with a cavity inside and a stator (101) fixedly connected to the cavity thereof. A rotor (103) adapted to the stator (101) and a shaft (102) fixedly connected to both ends thereof are arranged in the cavity of the housing (100), and it is characterized in that: Both ends of the shaft (102) are fixedly connected to bearings (104) connected to both ends of the casing (100). Multiple buffer seats (200) are respectively fixedly connected to both ends of the casing (100). A plurality of slide bars (201) are slidably connected inside each of the multiple buffer seats (200). A connecting block (202) fixedly connected to the outer surface of the bearing (104) is fixedly connected to the bottom of each of the plurality of slide bars (201). A shock absorption assembly for buffering the connecting block (202) is arranged inside the buffer seat (200). An auxiliary housing (300) is fixedly connected to one side of the casing (100). A sound absorption assembly is arranged inside the auxiliary housing (300); The shock absorption assembly includes a movable cavity (206) opened inside the buffer seat (200). A disc spring (205) is fixedly connected inside the movable cavity (206). A support plate (203) is fixedly connected to the outer surface of the slide bar (201). A rubber ring (204) that abuts against the disc spring (205) is fixedly connected to the top of the support plate (203); A rubber wall (207) that contacts the outer surface of the rubber ring (204) is fixedly connected inside the movable cavity (206). A plurality of elastic tabs (211) are evenly and fixedly connected to the outer surface of the rubber ring (204); An air cavity is constructed inside the rubber ring (204). An air delivery groove (210) is opened inside the slide bar (201), and the air delivery groove (210) communicates with the rubber ring (204) through the support plate (203). An extension rod (208) is fixedly connected inside the buffer seat (200). A piston (209) adapted to the inside of the slide bar (201) is fixedly connected to the bottom of the extension rod (208); The plurality of elastic tabs (211) are made of elastic materials, and the inside of each of the plurality of elastic tabs (211) communicates with the air cavity of the rubber ring (204).

2. The brushless DC motor with good silent effect according to claim 1, characterized in that: The sound absorption assembly includes a support ring (303) fixedly connected inside the auxiliary housing (300). A plurality of sound absorption cylinders (304) communicated with the support ring (303) are fixedly connected to the outer surface of the support ring (303). The inside of each of the plurality of sound absorption cylinders (304) is constructed with glass wool for sound absorption.

3. The brushless DC motor with good mute effect according to claim 2, characterized in that: A wind guide plate (301) is arranged inside the auxiliary housing (300). One end of the wind guide plate (301) is fixedly connected to one end of the support ring (303). Centrifugal heat dissipation blades (302) are evenly and fixedly connected to the outer surface of the shaft (102) located inside the wind guide plate (301).

4. A brushless DC motor with good sound insulation effect according to claim 2, characterized in that: A plurality of foam plastic inclined plates (305) are evenly and fixedly connected inside each of the plurality of sound absorption cylinders (304). The bottom of each of the plurality of foam plastic inclined plates (305) is constructed as an inclined surface.

5. A brushless DC motor with good mute effect according to claim 4, characterized in that: A movable shaft (306) is rotatably connected inside each of the plurality of sound absorption cylinders (304) and below the plurality of foam plastic inclined plates (305). A plurality of baffles (307) for restricting air flow are fixedly connected to the outer surface of the movable shaft (306).

6. The brushless DC motor with good sound insulation effect according to claim 5, characterized in that: A rolling groove (308) is formed inside each of the plurality of retaining pieces (307), and a gravity ball (309) is slidably connected inside each of the plurality of rolling grooves (308).

Images