A heat dissipation device for high-efficiency energy saving of variable-frequency motors

Abstract

The present invention discloses a heat dissipation device for high-efficiency energy saving of a variable-frequency motor, which includes a motor tail rotor, a fixed bracket, a fan mechanism, a variable-speed gear rod, a variable-speed rod bracket, a protective cylinder, a rotating shaft sleeve, a variable-speed mechanism, a speed-regulating mechanism and a fan cover; the fan mechanism is installed in the fan cover through the fixed bracket, the variable-speed gear rod is arranged in the protective cylinder through the variable-speed rod bracket and is rotatably connected with the variable-speed rod bracket; the lower part of the rotating shaft sleeve is fixedly connected with the motor tail rotor, a head gear is arranged at the top of the rotating shaft sleeve, the upper end of the variable-speed gear rod is in transmission connection with the fan mechanism, and the lower end thereof is in transmission connection with the rotating shaft sleeve through the head gear; the rotating shaft sleeve is driven by the motor tail rotor to rotate synchronously, and under the action of the variable-speed mechanism and the speed-regulating mechanism, the fan mechanism is driven to rotate through the variable-speed gear rod. By adopting the heat dissipation device of the present invention, it has the advantages of simple structure and low maintenance cost, and can meet the heat dissipation requirements of motors with various different power ratings.

Description

Technical Field

[0001] The present invention relates to the technical field of motor heat dissipation, and in particular to a high-efficiency and energy-saving heat dissipation device for a variable frequency motor. Background Art

[0002] The variable frequency motor adopts the AC speed regulation mode, which greatly improves the degree of mechanical automation and production efficiency. In many fields, variable frequency motors have been used to replace traditional mechanical speed regulation and DC speed regulation schemes. In contemporary industry, we strongly advocate technological innovation, energy saving and consumption reduction, and efficiency and income increase. The high and low voltage inverter drive motor mode has been widely used in the industrial market. The inverter can change the frequency to control the high and low speed of the motor and reduce the output power, thereby achieving the purpose of energy saving and consumption reduction. For industrial production lines, such as the transportation of slurry, air, water, mud, coal powder and other materials, the motor capacity is generally selected according to the maximum load during design. However, in the actual production process, the maximum actual load cannot be reached, resulting in a waste of electrical energy consumption. If the inverter is used for automatic speed regulation, the slurry, air, water, mud, coal powder and other materials in the low-speed and uniform-speed conveying pipeline in the actual load can be effectively adjusted and transmitted to meet the production line. It can be seen that full-load operation usually accounts for a very small proportion of the time, so the widespread use of frequency converters is an indispensable common device for protecting and adjusting motor speed in modern times, which can effectively save electrical energy.

[0003] However, there is a fatal disadvantage of using a frequency converter, which is that the frequency converter controls the motor speed by inputting 4 to 20 mA of electricity and changing the frequency from 0 to 50 Hz. At present, many motors are running at around 25 Hz for a long time. At this time, the motor current is large, the motor coil is seriously heated, and the speed of the cooling fan on the tail rotor is synchronized with the motor rotor speed, which can only reach half of its rated speed. Taking a 4-pole motor as an example, the 50 Hz speed is 1680 r / min. If the motor runs at 25 Hz, the speed is 840 r / min, and the synchronous speed fan is only 840 r / min. The wind speed generated at this time cannot achieve the heat dissipation effect. Long-term operation will cause the motor to overheat severely, accelerate the rapid aging of the coil insulation, and cause the coil turn short circuit and grounding to burn the motor, resulting in frequent maintenance of the motor, which not only shortens the service life of the motor, but also causes certain economic losses due to the burning of the motor.

[0004] At present, the best way to use fans powered by independent power supply in industry is to use independent power supply. However, the independent power supply has the following disadvantages in actual application: First, the power cable needs to be laid separately. If the distance between the indoor inverter control cabinet and the outdoor motor is far, it is necessary to groove the road surface and bury pipes, drill holes through the wall, and lay cable trays in the on-site environment. Due to many uncertain factors, the additional cost is greatly increased; second, the control circuit of the independent fan needs to be increased, which increases the cost; third, during the operation of the fan, the fan power is increased, the operating cost is increased, and the purpose of energy saving and consumption reduction is not achieved; fourth, the maintenance cost of the fan is increased, and the workload of the maintenance personnel is also increased.

[0005] Therefore, with respect to the existing heat dissipation method of variable frequency motors, it is of great significance to provide a heat dissipation device with simple structure, convenient operation and high cost performance. Summary of the invention

[0006] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing a heat dissipation device with a simple structure, easy operation, good versatility and high cost performance. The heat dissipation device can meet the needs of variable frequency motors of different models, and can achieve the fan to maintain a constant speed operation, improve the heat dissipation effect of the motor, and avoid the problem of overheating of the motor during long-term operation, thereby reducing the user's energy cost and achieving the purpose of energy saving and consumption reduction and creating benefits and increasing revenue. Specifically, it is a high-efficiency and energy-saving heat dissipation device for variable frequency motors.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-efficiency and energy-saving heat dissipation device for variable frequency motors, including a motor tail rotor, the heat dissipation device including a fixed bracket, a fan mechanism, a speed change gear rod, a speed change rod bracket, a protective cylinder, a rotating sleeve, a speed change mechanism, a speed regulating mechanism and a fan cover; the fan mechanism is installed in the fan cover through a fixed bracket, the protective cylinder is located below the fan mechanism, the speed change gear rod is arranged in the protective cylinder through the speed change rod bracket, and is rotatably connected to the speed change rod bracket; the lower part of the rotating sleeve is connected to the motor The tail rotor of the machine is fixedly connected, and a head gear is provided on the top of the rotating sleeve. The upper end of the speed change gear rod is transmission connected to the fan mechanism, and the lower end thereof is transmission connected to the rotating sleeve through the head gear; the speed change mechanism is arranged on the rotating sleeve and is connected to the speed change gear rod through a fixed bracket, and the speed regulating mechanism is arranged in the fixed bracket; the rotating sleeve is driven to rotate synchronously by the tail rotor of the motor, and under the action of the speed change mechanism and the speed regulating mechanism, the fan mechanism is driven to rotate through the speed change gear rod, and the purpose of automatic heat dissipation is achieved under the rotation of the fan mechanism.

[0008] Furthermore, for a heat dissipation device for efficient energy conservation of a variable-frequency motor according to the present invention, the fan mechanism includes a fan panel, fan blades, a fan rotating shaft, a large fan gear, and a small fan gear. A plurality of fan blades are provided on the fan panel. The fan rotating shaft is disposed at the center position of the bottom surface of the fan panel. The large fan gear and the small fan gear are both disposed on the fan rotating shaft, and the small fan gear is located above the large fan gear. The fan mechanism is rotationally connected to the fixed bracket through the fan panel and the fan rotating shaft. The rotating shaft sleeve is rotationally connected to the fixed bracket through the head gear. The variable-speed gear rod includes a gear rod, a large variable-speed gear, and a small variable-speed gear. The small variable-speed gear is composed of two small gears with the same structure, namely, an upper variable-speed gear and a lower variable-speed gear. The large variable-speed gear is disposed at the top of the gear rod. The lower variable-speed gear is disposed at the bottom of the gear rod. The upper variable-speed gear is disposed on the gear rod and is located between the large variable-speed gear and the lower variable-speed gear. The speed-regulating mechanism disposed in the fixed bracket is in contact connection with the large fan gear. The upper end and the lower end of the variable-speed gear rod are respectively in transmission connection with the fan mechanism and the rotating shaft sleeve through gears.

[0009] Furthermore, for a heat dissipation device for efficient energy conservation of a variable-frequency motor according to the present invention, two sets of variable-speed gear rods are provided. The two sets of variable-speed gear rods are symmetrically distributed on both sides of the fan mechanism through a variable-speed rod bracket. Between the fan mechanism and the variable-speed gear rod, the transmission connection between the two is achieved through the meshing connection of the small fan gear and the large variable-speed gear or the large fan gear and the upper variable-speed gear. Between the variable-speed gear rod and the rotating shaft sleeve, the transmission connection between the two is achieved through the meshing connection of the lower variable-speed gear and the head gear.

[0010] Furthermore, for a heat dissipation device for efficient energy conservation of a variable-frequency motor according to the present invention, the tooth diameter of the large variable-speed gear in the variable-speed gear rod is twice the tooth diameter of the small variable-speed gear. The tooth diameter of the large fan gear in the fan mechanism is twice the tooth diameter of the small fan gear. The tooth diameter of the large fan gear in the fan mechanism is the same as the tooth diameter of the head gear in the rotating shaft sleeve. During the synchronous rotation of the rotating shaft sleeve with the motor tail rotor, the lower variable-speed gear is driven to rotate through the head gear. During the rotation of the lower variable-speed gear, the large variable-speed gear and the upper variable-speed gear are driven to rotate synchronously through the gear rod. By using the meshing connection of the large variable-speed gear and the small fan gear or the upper variable-speed gear and the large fan gear, the fan mechanism rotates synchronously with the motor tail rotor, and the rotation speed of the fan mechanism is twice the rotation speed of the motor tail rotor, and it maintains a constant rotation state at twice the speed.

[0011] Furthermore, for a heat dissipation device for efficient energy conservation of a variable-frequency motor according to the present invention, the fixed bracket includes a support plate and a support shaft, and the support plate and the support shaft form a T-shaped structure. The fixed bracket is installed on the inner top of the fan housing through the support plate. A first through hole penetrating the fan panel and the fan rotating shaft is provided in the fan mechanism. A second through hole corresponding to the first through hole is provided in the head teeth of the rotating shaft sleeve. The first through hole and the second through hole both correspond to the support shaft, and plain bearings corresponding to the support shaft are respectively installed in the first through hole and the second through hole. The support shaft sequentially passes through the first through hole and the second through hole from top to bottom and extends into the rotating shaft sleeve to be connected to the speed change mechanism. The speed regulation mechanism is arranged on the support shaft in the fixed bracket. The support shaft is rotatably connected to the fan mechanism and the rotating shaft sleeve respectively through the plain bearings installed in the first through hole and the second through hole.

[0012] Furthermore, for a heat dissipation device for efficient energy conservation of a variable-frequency motor according to the present invention, the speed change mechanism includes a weight, a push crank arm, a crank arm sliding rod, a scissor-type thrust arm, a speed change push rod, and a speed change push plate. The speed change push plate is arranged in the protection cylinder and located on the upper surface of the speed change rod bracket. The speed change push plate is slidably connected to the fixed bracket and the speed change gear rod respectively. The top of the speed change push rod is in contact connection with the speed change push plate through the fixed bracket, and its bottom extends to the outside of the fixed bracket. Two weights and two push crank arms are provided. The two weights pass through the rotating shaft sleeve and are symmetrically distributed in the rotating shaft sleeve. The lower end of the push crank arm is fixedly connected to the weight located outside the rotating shaft sleeve, and the upper end respectively passes through the rotating shaft sleeve and is slidably connected to the crank arm sliding rod located inside the rotating shaft sleeve. The scissor-type thrust arm is arranged inside the rotating shaft sleeve. Its lower end is respectively in contact connection with the crank arm sliding rod, and its upper end is connected to the speed change push rod extending to the outside of the fixed bracket. Under the action of the speed change push rod or the speed regulation mechanism, the speed change push plate pushes the speed change gear rod to move in the protection cylinder upward or downward. The speed change gear rod is in transmission connection with the fan mechanism, and the rotation speed of the fan mechanism is adjusted by the speed change gear rod to keep the same as the rotation speed of the motor tail rotor in a constant state. Under the rotation of the fan mechanism, the purpose of automatic heat dissipation is achieved.

[0013] Furthermore, in a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, a pushing hole corresponding to the variable-speed pushing rod is provided in the support shaft, and a through hole corresponding to the variable-speed pushing plate is further provided in the support shaft. The pushing hole communicates with the through hole. The upper end of the variable-speed pushing rod is arranged in the support shaft of the fixed bracket through the pushing hole. A pressure bearing is provided at the top end of the scissor-type thrust arm. The lower end of the variable-speed pushing rod is rotatably connected to the top end of the scissor-type thrust arm through the pressure bearing. The variable-speed pushing plate is arranged on the upper surface of the variable-speed rod bracket by using the through hole, and its two ends are slidably connected to the variable-speed gear rod. The variable-speed pushing rod is in contact connection with the variable-speed pushing plate. Under the action of the variable-speed pushing rod, the variable-speed pushing plate pushes the variable-speed upper gear upward to be meshed with the large fan gear, and keeps the variable-speed lower gear meshed with the head gear, so that the fan mechanism and the motor tail rotor rotate synchronously through the variable-speed gear rod.

[0014] Furthermore, in a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, the speed regulating mechanism is a tension spring. The tension spring is sleeved on the support shaft in the fixed bracket, its upper end is in contact connection with the large fan gear in the fan mechanism, and its lower end is in contact connection with the variable-speed pushing plate in the variable-speed mechanism.

[0015] Furthermore, for a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, a weight hole, a support hole and a slide rod connection hole corresponding to a weight, a push crank arm and a crank arm slide rod are respectively arranged on the side surface of the rotating shaft sleeve; the two weights are symmetrically distributed in the rotating shaft sleeve through the weight holes, and the side surfaces of the two weights corresponding to each other are arranged as arc surface structures, and the other side away from the arc surface structure is located outside the rotating shaft sleeve; the lower end of the push crank arm is fixedly connected with the weight located outside the rotating shaft sleeve, and the upper end respectively passes through the support hole and is slidably connected with the crank arm slide rod located in the rotating shaft sleeve; the crank arm slide rod is fixedly connected with the rotating shaft sleeve through the slide rod connection hole; and a crank arm fulcrum corresponding to the push crank arm is further arranged on the side surface of the rotating shaft sleeve, the crank arm fulcrum is located above the weight hole, and the push crank arm is in contact connection with the rotating shaft sleeve through the crank arm fulcrum; when the weight rotates with the rotating shaft sleeve, a centrifugal force is generated to push the push crank arm outwards, under the action of the crank arm fulcrum, the upper end of the push crank arm moves relatively along the crank arm slide rod, and the scissors-type thrust arm is driven to move upwards by the push crank arm, under the action of the scissors-type thrust arm, the variable-speed push rod pushes the variable-speed push plate upwards, the variable-speed gear rod is pushed to move in the protective cylinder through the variable-speed push plate, the variable-speed upper gear in the variable-speed gear rod is meshed and connected with the large fan gear, and the fan mechanism and the motor tail rotor are synchronously rotated through the variable-speed gear rod; under the action of the speed regulation mechanism, the variable-speed push plate pushes the variable-speed push plate downwards, the variable-speed gear rod is pushed to move in the protective cylinder through the variable-speed push plate, the variable-speed large gear in the variable-speed gear rod is meshed and connected with the small fan gear, and the fan mechanism and the motor tail rotor are synchronously rotated through the variable-speed gear rod.

[0016] Furthermore, for a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, it further includes a plurality of connecting bolts, and the fixed bracket and the fan cover, as well as the variable-speed rod bracket and the protective cylinder, and the rotating shaft sleeve and the motor tail rotor are all fixedly connected through the connecting bolts; a through hole corresponding to the variable-speed gear rod is arranged in the variable-speed rod bracket, and the variable-speed gear rod is rotatably connected with the variable-speed rod bracket through the corresponding through hole; and the head gear arranged on the top of the rotating shaft sleeve and the rotating shaft sleeve are made into an integral structure by using a metal material or a heat-resistant plastic material, or are fixedly connected into an integral structure by using a welding method.

[0017] When the motor tail rotor rotates at a low speed by adopting the heat dissipation device of the present invention, the speed change mechanism maintains the initial state, the rotating shaft sleeve is driven to rotate synchronously by the motor tail rotor, and then the variable-speed gear rod is driven to rotate synchronously by the head gear, the fan mechanism is driven to rotate at a high speed by the variable-speed gear rod, so that the wind speed generated by the fan blades in the fan mechanism during rotation realizes the heat dissipation purpose.

[0018] When the rotor at the tail of the motor rotates at a high speed, the rotating shaft sleeve is driven to rotate synchronously by the rotor at the tail of the motor. During the rotation of the rotating shaft sleeve, the speed-changing mechanism changes from the initial state to the telescopic state. During the high-speed rotation of the rotating shaft sleeve, the speed-changing mechanism generates centrifugal force through the weight. During the outward movement of the weight, the lower end of the weight crank arm is driven to move outward. Under the action of the crank arm fulcrum, the upper end of the weight crank arm moves in the reverse direction (inward). During the inward movement, the scissor-type thrust arm in contact with the crank arm sliding rod is pushed. During the inward movement of the scissor-type thrust arm, it elongates, thereby driving the speed-changing push rod to move upward in the push hole in the support shaft. During the upward movement of the speed-changing push rod, the speed-changing push plate is driven to move upward. Finally, the speed-changing gear rods on both sides are driven to move upward by the speed-changing push plate, so that the speed-changing upper gear in the speed-changing gear rod meshes with the large fan gear, and the fan mechanism rotates synchronously with the rotor at the tail of the motor. Since the tooth diameter of the large speed-changing gear in the speed-changing gear rod is twice that of the small speed-changing gear, the tooth diameter of the large fan gear in the fan mechanism is twice that of the small fan gear, and the tooth diameter of the large fan gear in the fan mechanism is the same as the tooth diameter of the head gear in the rotating shaft sleeve, a 2-fold tooth diameter structure is adopted to prevent the fan mechanism from rotating at a high speed when the rotor at the tail of the motor rotates at a high speed, thus avoiding damage to the fan mechanism during high-speed rotation. It can be seen that by meshing the speed-changing upper gear with the large fan gear, the rotation speed of the fan mechanism can be twice that of the rotor at the tail of the motor and maintain a constant 2-fold speed continuous rotation state.

[0019] Using a heat dissipation device for high-efficiency energy-saving of a variable-frequency motor according to the present invention, compared with the prior art, its beneficial effects are as follows: By setting the fan mechanism and the speed-changing gear rod, and under the action of the speed-changing mechanism and the speed-regulating mechanism, automatic constant high-speed rotation can be achieved. By adopting a mechanical structure, compared with the existing independent power supply for the fan, not only a large amount of funds and electricity energy consumption can be saved, but also the heat dissipation effect during the low-speed operation of the motor can be ensured, greatly extending the service life of the motor. At the same time, the motor maintenance cost is also saved, ensuring that the use scenario can operate smoothly and normally. The heat dissipation device according to the present invention has a simple structure, low maintenance cost, can be popularized and applied to motors of different specifications, is easy to install, can be assembled in the housing, can meet the heat dissipation requirements of motors of various power sizes, and can be widely popularized and applied to industrial factories and mines such as power plants, cement plants, chemical plants, and steel plants, which has very important significance for how to improve the heat dissipation capacity and heat dissipation method of motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1is a schematic structural view of the present invention;

[0022] Figure 2 is a schematic structural view of the present invention after hiding the rear rotor of the motor and the fan housing;

[0023] Figure 3 is a schematic structural view of the fixing bracket described in the present invention;

[0024] Figure 4 is a schematic structural view of the fan mechanism described in the present invention;

[0025] Figure 5 is Figure 4 the top view of;

[0026] Figure 6 is a schematic structural view of the speed-changing gear lever described in the present invention;

[0027] Figure 7 is a schematic structural view of the rotating shaft sleeve described in the present invention.

[0028] As shown in the figure: 1 - rear rotor of the motor, 2 - fixing bracket, 21 - support plate, 22 - support shaft, 23 - pushing hole, 24 - through hole, 3 - fan mechanism, 31 - fan panel, 32 - fan blade, 33 - fan rotating shaft, 34 - large fan gear, 35 - small fan gear, 36 - first through hole, 4 - speed-changing gear lever, 41 - gear lever, 42 - large speed-changing gear, 43 - upper speed-changing gear, 44 - lower speed-changing gear, 5 - speed-changing lever bracket, 6 - protective cylinder, 7 - rotating shaft sleeve, 71 - head gear, 72 - second through hole, 73 - weight hole, 74 - support hole, 75 - slide rod connection hole, 76 - toggle arm fulcrum, 8 - speed-changing mechanism, 81 - weight, 811 - arc structure, 82 - pushing toggle arm, 83 - toggle arm sliding rod, 84 - scissor-type thrust arm, 85 - speed-changing push rod, 86 - speed-changing push plate, 9 - speed-regulating mechanism, 10 - fan housing, 11 - plain bearing, 12 - pressure bearing, 13 - connecting bolt. Detailed Embodiments

[0029] To further illustrate the concept of the present invention, the following will further describe in detail the specific embodiments of the present invention with reference to the accompanying drawings:

[0030] As Figures 1 to 7As shown, a heat dissipation device for variable frequency motor with high efficiency and energy saving according to the present invention comprises a motor tail rotor 1, the heat dissipation device comprises a fixed bracket 2, a fan mechanism 3, a speed change gear rod 4, a speed change rod bracket 5, a protective cylinder 6, a rotating sleeve 7, a speed change mechanism 8, a speed regulating mechanism 9 and a fan housing 10; the fan mechanism 3 is installed in the fan housing 10 through the fixed bracket 2, the protective cylinder 6 is located below the fan mechanism 3, the speed change gear rod 4 is arranged in the protective cylinder 6 through the speed change rod bracket 5, and is rotatably connected with the speed change rod bracket 5; the lower part of the rotating sleeve 7 is fixed to the motor tail rotor 1 A head gear 71 is provided on the top of the rotating sleeve 7, the upper end of the speed change gear rod 4 is transmission-connected to the fan mechanism 3, and the lower end thereof is transmission-connected to the rotating sleeve 7 through the head gear 71; the speed change mechanism 8 is arranged on the rotating sleeve 7, and is connected to the speed change gear rod 4 through the fixed bracket 2, and the speed regulating mechanism 9 is arranged in the fixed bracket 2; the rotating sleeve 7 is driven to rotate synchronously through the tail rotor 1 of the motor, and under the action of the speed change mechanism 8 and the speed regulating mechanism 9, the fan mechanism 3 is driven to rotate through the speed change gear rod 4, and the purpose of automatic heat dissipation is achieved under the rotation of the fan mechanism 3.

[0031] Furthermore, the present invention discloses a highly efficient and energy-saving heat dissipation device for a variable frequency motor, wherein the fan mechanism 3 comprises a fan panel 31, fan blades 32, a fan shaft 33, a large fan gear 34 and a small fan gear 35, wherein a plurality of fan blades 32 are arranged on the fan panel 31, the fan shaft 33 is arranged at the center of the bottom surface of the fan panel 31, the large fan gear 34 and the small fan gear 35 are both arranged on the fan shaft 33, wherein the small fan gear 35 is located above the large fan gear 35; the fan mechanism 3 is rotatably connected to the fixed bracket 2 through the fan panel 31 and the fan shaft 33; and the rotating sleeve 7 is connected to the fixed bracket through the head gear 71 2 is rotatably connected; the speed change gear rod 4 includes a gear rod 41, a large speed change gear 42 and a small speed change gear, wherein the small speed change gear is composed of two small gears with the same structure, the two small gears are respectively a speed change upper gear 43 and a speed change lower gear 44, the large speed change gear 42 is arranged at the top of the gear rod 41, the lower speed change gear 44 is arranged at the bottom of the gear rod 41, the upper speed change gear 43 is arranged on the gear rod 41 and is located between the large speed change gear 42 and the lower speed change gear 44; the speed regulating mechanism 9 arranged in the fixed bracket 2 is in contact with the large fan gear 34; the upper end and the lower end of the speed change gear rod 4 are respectively connected to the fan mechanism 3 and the rotating shaft sleeve 7 through gears.

[0032] Further, for a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, two sets of variable-speed gear rods 4 are provided, and the two sets of variable-speed gear rods 4 are symmetrically distributed on both sides of the fan mechanism 3 through a variable-speed rod bracket 5; between the fan mechanism 3 and the variable-speed gear rod 4, they are meshed and connected through a fan pinion 35 and a variable-speed large gear 42 or a fan large gear 34 and a variable-speed upper gear 43 to achieve the transmission connection between the two; and between the variable-speed gear rod 4 and the rotating shaft sleeve 7, they are meshed and connected through a variable-speed lower gear 44 and a head gear 71 to achieve the transmission connection between the two.

[0033] Further, for a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, the tooth diameter of the variable-speed large gear 42 in the variable-speed gear rod 4 is twice the tooth diameter of the variable-speed pinion, the tooth diameter of the fan large gear 34 in the fan mechanism 3 is twice the tooth diameter of the fan pinion 35, and the tooth diameter of the fan large gear 34 in the fan mechanism 3 is the same as the tooth diameter of the head gear 71 in the rotating shaft sleeve 7; during the synchronous rotation of the rotating shaft sleeve 7 with the motor tail rotor 1, the head gear 71 drives the variable-speed lower gear 44 to rotate. During the rotation of the variable-speed lower gear 44, the variable-speed large gear 42 and the variable-speed upper gear 43 are driven to rotate synchronously through the gear rod 41. By using the meshing connection between the variable-speed large gear 42 and the fan pinion 35 or the variable-speed upper gear 43 and the fan large gear 34, the fan mechanism 3 rotates synchronously with the motor tail rotor 1, and the rotation speed of the fan mechanism 3 is twice the rotation speed of the motor tail rotor 1, and it maintains a constant speed of twice and continues to rotate.

[0034] Further, for a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, the fixed bracket 2 includes a support plate 21 and a support shaft 22. The support plate 21 and the support shaft 22 form a T-shaped structure, and the fixed bracket 2 is installed on the inner top of the fan housing 10 through the support plate 21; in the fan mechanism 3, a first through hole 36 penetrating the fan panel 31 and the fan rotating shaft 33 is provided, and a second through hole 72 corresponding to the first through hole 36 is provided in the head tooth 71 of the rotating shaft sleeve 7. The first through hole 36 and the second through hole 72 both correspond to the support shaft 22, and plain bearings 11 corresponding to the support shaft 22 are respectively installed in the first through hole 36 and the second through hole 72; the support shaft 22 sequentially passes through the first through hole 36 and the second through hole 72 from top to bottom and extends into the rotating shaft sleeve 7 to be connected to the speed change mechanism 8. The speed regulation mechanism 9 is arranged on the support shaft 22 in the fixed bracket 2, and the support shaft 22 is rotationally connected to the fan mechanism 3 and the rotating shaft sleeve 7 respectively through the plain bearings 11 installed in the first through hole 36 and the second through hole 72.

[0035] Furthermore, in a heat dissipation device for efficient energy saving of a variable frequency motor according to the present invention, the speed change mechanism 8 includes a weight 81, a push crank arm 82, a crank arm sliding rod 83, a scissor type thrust arm 84, a speed change push rod 85 and a speed change push plate 86. The speed change push plate 86 is arranged in the protection cylinder 6 and located on the upper surface of the speed change rod support 5. The speed change push plate 86 is respectively slidably connected with the fixed support 2 and the speed change gear rod 4. The top of the speed change push rod 85 is in contact connection with the speed change push plate 86 through the fixed support 2, and its bottom extends to the outside of the fixed support 2. There are two weights 81 and push crank arms 82. The two weights 81 pass through the rotary shaft sleeve 7 and are symmetrically distributed in the rotary shaft sleeve 7. The lower end of the push crank arm 82 is fixedly connected with the weight 81 located outside the rotary shaft sleeve 7, and the upper end respectively passes through the rotary shaft sleeve 7 and is slidably connected with the crank arm sliding rod 83 located inside the rotary shaft sleeve 7. The scissor type thrust arm 84 is arranged inside the rotary shaft sleeve 7. Its lower end is respectively in contact connection with the crank arm sliding rod 83, and the upper end is connected with the speed change push rod 85 extending to the outside of the fixed support 2. Under the action of the speed change push rod 85 or the speed regulation mechanism 9, the speed change push plate 86 pushes the speed change gear rod 4 to move in the protection cylinder 6 upward or downward. Through the transmission connection between the speed change gear rod 4 and the fan mechanism 3, the rotation speed of the fan mechanism 3 is adjusted to be kept constant with the rotation speed of the rotor 1 at the tail of the motor. Under the rotation of the fan mechanism 3, the purpose of automatic heat dissipation is achieved.

[0036] Further, in a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, a pushing hole 23 corresponding to the variable-speed pushing rod 85 is provided in the support shaft 22, and a through hole 24 corresponding to the variable-speed pushing plate 86 is further provided in the support shaft 22. The pushing hole 23 communicates with the through hole 24. The upper end of the variable-speed pushing rod 85 is arranged in the support shaft 22 of the fixed bracket 2 through the pushing hole 23. A pressure bearing 12 is provided at the top end of the scissor-type thrust arm 84. The lower end of the variable-speed pushing rod 85 is rotatably connected to the top end of the scissor-type thrust arm 84 through the pressure bearing 12. The variable-speed pushing plate 86 is arranged on the upper surface of the variable-speed rod bracket 5 by using the through hole 24, and its two ends are slidably connected to the variable-speed gear rod 4. The variable-speed pushing rod 85 is in contact connection with the variable-speed pushing plate 86; under the action of the variable-speed pushing rod 85, the variable-speed pushing plate 86 pushes the variable-speed upper gear 43 upwards to be meshed with the fan large gear 34, and keeps the variable-speed lower gear 44 meshed with the head gear 71, so that the fan mechanism 3 and the motor tail rotor 1 rotate synchronously through the variable-speed gear rod 4. The height of the through hole 24 is greater than the distance between the fan large gear 34 and the variable-speed upper gear 43. The stroke of the variable-speed gear rod 4 is controlled by the height of the through hole 24, that is, the stroke of the variable-speed gear rod 4 is controlled by the distance that the variable-speed pushing plate 86 moves up and down in the through hole 24.

[0037] Further, in a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, the speed regulating mechanism 9 is a tension spring. The tension spring is sleeved on the support shaft 22 in the fixed bracket 2, its upper end is in contact connection with the fan large gear 34 in the fan mechanism 3, and its lower end is in contact connection with the variable-speed pushing plate 86 in the variable-speed mechanism 8.

[0038] Further, in a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention, a weight hole 73, a support hole 74, and a slide rod connection hole 75 corresponding to a weight 81, a push crank arm 82, and a crank arm slide rod 83 are respectively provided on the side surface of the rotating shaft sleeve 7; the two weights 81 are symmetrically distributed in the rotating shaft sleeve 7 through the weight holes 73, and the side surfaces of the two weights 81 corresponding to each other are arranged as an arc surface structure 811, and the other side away from the arc surface structure 811 is located outside the rotating shaft sleeve 7; the lower end of the push crank arm 82 is fixedly connected to the weight 81 located outside the rotating shaft sleeve 7, and the upper end respectively passes through the support hole 74 and is slidably connected to the crank arm slide rod 83 located in the rotating shaft sleeve 7; the crank arm slide rod 83 is fixedly connected to the rotating shaft sleeve 7 through the slide rod connection hole 75; and a crank arm fulcrum 76 corresponding to the push crank arm 82 is further provided on the side surface of the rotating shaft sleeve 7, the crank arm fulcrum 76 is located above the weight hole 73, and the push crank arm 82 is in contact connection with the rotating shaft sleeve 7 through the crank arm fulcrum 76; the weight 81 generates a centrifugal force during the rotation of the rotating shaft sleeve 7 and pushes the push crank arm 82 outwards, and under the action of the crank arm fulcrum 76, the upper end of the push crank arm 82 moves relatively along the crank arm slide rod 83, and drives the scissors-type thrust arm 84 to move upwards through the push crank arm 82. Under the action of the scissors-type thrust arm 84, the variable-speed push rod 85 pushes the variable-speed push plate 86 upwards, and the variable-speed gear rod 4 is pushed to move in the protective cylinder 6 through the variable-speed push plate 86. The variable-speed upper gear 43 in the variable-speed gear rod 4 is meshed with the large fan gear 34, and the fan mechanism 3 and the motor tail rotor 1 are synchronously rotated through the variable-speed gear rod 4; under the action of the speed regulation mechanism 9, the variable-speed push plate 86 is pushed downwards, and the variable-speed gear rod 4 is pushed to move in the protective cylinder 6 through the variable-speed push plate 86, so that the large variable-speed gear 42 in the variable-speed gear rod 4 is meshed with the small fan gear 35, and the fan mechanism 3 and the motor tail rotor 1 are synchronously rotated through the variable-speed gear rod 4.

[0039] Further, a heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to the present invention further includes a plurality of connecting bolts 13. The fixed bracket 2 and the fan housing 10, the variable-speed rod bracket 5 and the protective cylinder 6, and the rotating shaft sleeve 7 and the motor tail rotor 1 are all fixedly connected through the connecting bolts 13; a through hole corresponding to the variable-speed gear rod 4 is provided in the variable-speed rod bracket 5, and the variable-speed gear rod 4 is rotatably connected to the variable-speed rod bracket 5 through the corresponding through hole; the head gear 71 provided at the top of the rotating shaft sleeve 7 and the rotating shaft sleeve 7 are integrally formed by using a metal material or a heat-resistant plastic material, or are fixedly connected into an integral structure by welding.

[0040] Using the heat dissipation device of the present invention, its design principle is as follows: a speed change is achieved by using a variable speed gear. That is, when the rotational speed of the motor rotor is 840 r / min, a gear mechanism is set up to drive the fan, so as to reach a speed of 2 times (1680 r / min). If the rotational speed of the motor rotor is greater than 1000 r / min, if it continues to increase at a speed of 2 times, it is easy to cause damage to the fan during high-speed operation. In order not to let the fan speed continue to increase exponentially, when the rotational speed of the motor rotor is greater than 1000 r / min, a variable speed mechanism 8 is set up. The centrifugal force generated by the weight is used to push the lever arm. Under the action of the lever arm, a thrust is formed to push the balance plate, and then the balance plate is used to push the variable speed gear upward, so as to reach a speed of 1 time, thus reducing the speed of the fan from 1680 r / min, and it will not continue to increase due to excessive increase in the rotor speed, so as to avoid damage during high-speed rotation, and achieve the purpose of always maintaining a constant rotational speed of 1680 r / min.

[0041] When using the heat dissipation device of the present invention, in the specific application process, its working principle is as follows: first, the fan mechanism 3 is installed in the fan housing 10 at the tail end of the motor through the fixing bracket 2, and then the rotor 1 at the tail end of the motor is fixed on the rotating shaft sleeve 7, and the corresponding connecting bolt 13 is tightened to make a fixed connection, so as to prevent the rotor 1 at the tail end of the motor from loosening during rotation, that is, the installation before use is completed.

[0042] When the motor operates below 30HZ, the speed change of the whole device is in a state of 2 times the original speed change. That is, the rotor 1 at the tail end of the motor drives the rotating shaft sleeve 7 to rotate, and the rotation speed of the rotating shaft sleeve 7 is synchronous with the rotor 1 at the tail end of the motor. The head gear 71 on the rotating shaft sleeve 7 is meshed and connected with the lower speed change gear 44 on the speed change gear rod 4, that is, the head gear 71 is used to drive the speed change gear rod 4 to rotate synchronously. Since the tooth diameter of the head gear 71 is 2 times the tooth diameter of the lower speed change gear 44, and the tooth diameter of the large speed change gear 42 in the speed change gear rod 4 is 2 times the tooth diameter of the small fan gear 35, that is, the gear ratio of the large speed change gear 42 and the small speed change gear in the speed change gear rod 4 is equal to the gear ratio of the large fan gear 34 and the small fan gear 35 in the fan mechanism 3. Under the action of the speed regulation mechanism 9, it can maintain a rotation speed of 2 times, so that when the motor rotates at a low speed, the fan still operates at a high speed, effectively solving the problem of serious heating caused by insufficient wind force when the motor operates at a low speed.

[0043] When the motor load increases and the frequency converter operates above 30HZ, when the rotor 1 at the tail of the motor rotates above 1000r / min, due to the centrifugal force generated outward during the rotation of the two set weights 81, the centrifugal force generated can be calculated through the centrifugal force formula. The calculation formula for centrifugal force is the same as that for centripetal force. The centrifugal force of circular motion = mass * (square of velocity) / radius or mass * (square of angular velocity) / radius, that is, F = mv² / r or F = mω² / r, where m represents mass, with the unit of kilogram kg, v represents linear velocity, with the unit of meter per second m / s, ω represents angular velocity, with the unit of revolution per second rad / s, and r represents the radius of centrifugal motion, with the unit of meter m.

[0044] Assume the weight of the weight 81 is 1 kilogram and the radius of the rotating shaft sleeve 7 is 0.03 meters. When the speed of the rotor 1 at the tail of the motor accelerates from 1000 revolutions per minute to 1200 revolutions per minute, the weight 81 can generate an outward thrust of about 14 kilogram-force, which can thus push the speed-changing gear lever 4 to rotate for speed change, and drive the fan mechanism 3 to rotate at a constant speed through the speed-changing gear lever 4.

[0045] Thus, it can be seen that the centrifugal force generated by the two weights 81 is used to push the push link 82 to move outward. Under the action of the scissor-type thrust arm 84, through the speed-changing push rod 85 and the speed-changing push plate 86, the speed-changing gear lever 4 is then pushed upward, so that the large speed-changing gear 42 on the speed-changing gear lever 4 disengages from the small fan gear 35 in the fan mechanism 3, and the small speed-changing gear on the speed-changing gear lever 4 meshes with the large fan gear 34 in the fan mechanism 3. Since the tooth diameter of the large fan gear 34 is twice that of the small speed-changing gear, the rotational speed is reduced, and the fan speed is synchronized with the motor speed, so that the high-speed state of the motor is the same as the fan speed, and thus the fan blades 32 in the fan mechanism 3 always maintain a constant high-speed state, that is, maintain a constant state of 1680r / min.

[0046] When the motor speed drops to 1000r / min, since the two set weights 81 cannot generate enough centrifugal force to push the push link 82 outward during rotation, the speed-changing push plate 86 automatically resets downward. At the same time, under the action of the speed-regulating mechanism 9, the tension spring is used to push the speed-changing gear lever 4 downward, thereby restoring and switching to the original state of 2-fold speed change.

[0047] In addition, in order to improve the intelligence of the heat dissipation device described in the present invention, a digital display device can also be configured to monitor the rotational speed and rotation direction of the fan mechanism 3, so as to achieve the purpose of display.

[0048] It can be seen that by adopting the heat dissipation device of the present invention, through the set fan mechanism 3 and the variable speed gear rod 4, and under the action of the speed change mechanism 8 and the speed regulation mechanism 9, automatic constant high-speed rotation can be achieved. Using a mechanical structure, compared with a fan powered by an independent power supply, it can not only save a large amount of funds and power consumption, but also ensure the heat dissipation effect when the motor runs at a low speed, greatly extending the service life of the motor. At the same time, it also saves the motor maintenance cost and ensures the smoothness of production.

[0049] In summary, by adopting the heat dissipation device of the present invention, it has a simple structure, low maintenance cost, can be popularized and applied to motors of different specifications, is easy to install, can produce and process end covers suitable for different models of motors, and can be assembled in the cover. It can meet the heat dissipation requirements of motors of various power sizes, and can be widely popularized and applied to industrial plants such as power plants, cement plants, chemical plants, and steel plants. It has very important significance for how to improve the heat dissipation capacity and heat dissipation method of motors.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat dissipation device for high-efficiency energy saving of a variable-frequency motor, comprising a motor tail rotor (1), characterized in that: The heat dissipation device includes a fixed bracket (2), a fan mechanism (3), a variable-speed gear rod (4), a gear rod bracket (5), a protective cylinder (6), a rotating shaft sleeve (7), a variable-speed mechanism (8), a speed-regulating mechanism (9), and a fan housing (10); the fan mechanism (3) is installed in the fan housing (10) through the fixed bracket (2), the protective cylinder (6) is located below the fan mechanism (3), the variable-speed gear rod (4) is arranged in the protective cylinder (6) through the gear rod bracket (5) and is rotatably connected to the gear rod bracket (5); the lower part of the rotating shaft sleeve (7) is fixedly connected to the tail rotor (1) of the motor, a head gear (71) is provided at the top of the rotating shaft sleeve (7), the upper end of the variable-speed gear rod (4) is drivingly connected to the fan mechanism (3), and its lower end is drivingly connected to the rotating shaft sleeve (7) through the head gear (71); the variable-speed mechanism (8) is arranged on the rotating shaft sleeve (7) and is connected to the variable-speed gear rod (4) through the fixed bracket (2), and the speed-regulating mechanism (9) is arranged in the fixed bracket (2); the rotating shaft sleeve (7) is driven by the tail rotor (1) of the motor to rotate synchronously, and under the action of the variable-speed mechanism (8) and the speed-regulating mechanism (9), the fan mechanism (3) is driven to rotate through the variable-speed gear rod (4), and under the rotation of the fan mechanism (3), the purpose of automatic heat dissipation is achieved; Among them, the fan mechanism (3) includes a fan panel (31), fan blades (32), a fan rotating shaft (33), a large fan gear (34), and a small fan gear (35). A plurality of fan blades (32) are provided on the fan panel (31), the fan rotating shaft (33) is arranged at the center position of the bottom surface of the fan panel (31), both the large fan gear (34) and the small fan gear (35) are arranged on the fan rotating shaft (33), and the small fan gear (35) is located above the large fan gear (34); the fan mechanism (3) is rotatably connected to the fixed bracket (2) through the fan panel (31) and the fan rotating shaft (33); and the rotating shaft sleeve (7) is rotatably connected to the fixed bracket (2) through the head gear (71); the variable-speed gear rod (4) includes a gear rod (41), a large variable-speed gear (42), and a small variable-speed gear. The small variable-speed gear is composed of two small gears with the same structure, which are respectively an upper variable-speed gear (43) and a lower variable-speed gear (44). The large variable-speed gear (42) is arranged at the top of the gear rod (41), the lower variable-speed gear (44) is arranged at the bottom of the gear rod (41), and the upper variable-speed gear (43) is arranged on the gear rod (41) and is located between the large variable-speed gear (42) and the lower variable-speed gear (44); the speed-regulating mechanism (9) arranged in the fixed bracket (2) is in contact connection with the large fan gear (34); the upper end and the lower end of the variable-speed gear rod (4) are respectively drivingly connected to the fan mechanism (3) and the rotating shaft sleeve (7) through gears; The fixed bracket (2) includes a support plate (21) and a support shaft (22). The support plate (21) and the support shaft (22) form a T-shaped structure. The fixed bracket (2) is installed on the inner top of the fan housing (10) through the support plate (21). In the fan mechanism (3), a first through hole (36) runs through the fan panel (31) and the fan rotating shaft (33). In the head gear (71) of the rotating shaft sleeve (7), a second through hole (72) corresponding to the first through hole (36) is provided. The first through hole (36) and the second through hole (72) both correspond to the support shaft (22), and plain bearings (11) corresponding to the support shaft (22) are respectively installed in the first through hole (36) and the second through hole (72). The support shaft (22) passes through the first through hole (36) and the second through hole (72) from top to bottom and extends into the rotating shaft sleeve (7) to be connected to the speed change mechanism (8). The speed regulation mechanism (9) is arranged on the support shaft (22) in the fixed bracket (2). The support shaft (22) is rotatably connected to the fan mechanism (3) and the rotating shaft sleeve (7) respectively through the plain bearings (11) installed in the first through hole (36) and the second through hole (72). There are two sets of the speed change gear rods (4). The two sets of speed change gear rods (4) are symmetrically distributed on both sides of the fan mechanism (3) through the speed change rod bracket (5). Between the fan mechanism (3) and the speed change gear rods (4), the transmission connection between the two is realized through the meshing connection of the fan pinion (35) and the speed change large gear (42) or the fan large gear (34) and the speed change upper gear (43). Between the speed change gear rods (4) and the rotating shaft sleeve (7), the transmission connection between the two is realized through the meshing connection of the speed change lower gear (44) and the head gear (71). The speed change mechanism (8) includes a weight (81), a push crank arm (82), a crank arm sliding rod (83), a scissor-type thrust arm (84), a speed change push rod (85) and a speed change push plate (86). The speed change push plate (86) is arranged in the protective cylinder (6) and located on the upper surface of the speed change rod bracket (5). The speed change push plate (86) is slidably connected to the fixed bracket (2) and the speed change gear rod (4) respectively. The top of the speed change push rod (85) is in contact connection with the speed change push plate (86) through the fixed bracket (2), and its bottom extends to the outside of the fixed bracket (2); there are two weights (81) and push crank arms (82). The two weights (81) pass through the rotary shaft sleeve (7) and are symmetrically distributed in the rotary shaft sleeve (7). The lower end of the push crank arm (82) is fixedly connected to the weight (81) located outside the rotary shaft sleeve (7), and the upper end passes through the rotary shaft sleeve (7) respectively and is slidably connected to the crank arm sliding rod (83) located inside the rotary shaft sleeve (7). The scissor-type thrust arm (84) is arranged inside the rotary shaft sleeve (7). Its lower end is in contact connection with the crank arm sliding rod (83) respectively, and the upper end is connected to the speed change push rod (85) extending to the outside of the fixed bracket (2); under the action of the speed change push rod (85) or the speed regulation mechanism (9), the speed change push plate (86) pushes the speed change gear rod (4) to move up or down in the protective cylinder (6). Through the transmission connection between the speed change gear rod (4) and the fan mechanism (3), the rotation speed of the fan mechanism (3) is adjusted to be kept constant with the rotation speed of the motor tail rotor (1).

2. The heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to claim 1, characterized in that: The tooth diameter of the large speed change gear (42) in the speed change gear rod (4) is twice the tooth diameter of the small speed change gear. The tooth diameter of the large fan gear (34) in the fan mechanism (3) is twice the tooth diameter of the small fan gear (35). The tooth diameter of the large fan gear (34) in the fan mechanism (3) is the same as the tooth diameter of the head gear (71) in the rotary shaft sleeve (7); during the synchronous rotation of the rotary shaft sleeve (7) with the motor tail rotor (1), the head gear (71) drives the lower speed change gear (44) to rotate. During the rotation of the lower speed change gear (44), the large speed change gear (42) and the upper speed change gear (43) are driven to rotate synchronously through the gear rod (41). By the meshing connection between the large speed change gear (42) and the small fan gear (35) or the upper speed change gear (43) and the large fan gear (34), the fan mechanism (3) rotates synchronously with the motor tail rotor (1), so that the rotation speed of the fan mechanism (3) is twice the rotation speed of the motor tail rotor (1), and it maintains a constant speed of twice and continues to rotate.

3. The heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to claim 1, characterized in that: A push hole (23) corresponding to the speed change push rod (85) is provided in the support shaft (22), and a through hole (24) corresponding to the speed change push plate (86) is further provided in the support shaft (22). The push hole (23) communicates with the through hole (24). The upper end of the speed change push rod (85) is arranged in the support shaft (22) of the fixed bracket (2) through the push hole (23). A pressure bearing (12) is provided at the top end of the scissor type thrust arm (84). The lower end of the speed change push rod (85) is rotatably connected to the top end of the scissor type thrust arm (84) through the pressure bearing (12). The speed change push plate (86) is arranged on the upper surface of the speed change rod bracket (5) by using the through hole (24), and its two ends are slidably connected to the speed change gear rod (4). The speed change push rod (85) is in contact connection with the speed change push plate (86). Under the action of the speed change push rod (85), the speed change push plate (86) pushes the speed change upper gear (43) to be meshed with the fan large gear (34), and keeps the speed change lower gear (44) to be meshed with the head gear (71). The fan mechanism (3) and the motor tail rotor (1) are synchronously rotated through the speed change gear rod (4).

4. A heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to claim 1, characterized in that: The speed regulation mechanism (9) is a tension spring. The tension spring is sleeved on the support shaft (22) in the fixed bracket (2), its upper end is in contact connection with the fan large gear (34) in the fan mechanism (3), and its lower end is in contact connection with the speed change push plate (86) in the speed change mechanism (8).

5. A heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to claim 1, characterized in that: On the side surface of the rotating shaft sleeve (7), there are respectively a weight hole (73), a support hole (74), and a slide rod connection hole (75) corresponding to the weight (81), the push crank arm (82), and the crank arm slide rod (83); two weights (81) are symmetrically distributed in the rotating shaft sleeve (7) through the weight holes (73), and the side surfaces of the two weights (81) corresponding to each other are arranged as arc surface structures (811), while the other side away from the arc surface structure (811) is located outside the rotating shaft sleeve (7); the lower end of the push crank arm (82) is fixedly connected to the weight (81) located outside the rotating shaft sleeve (7), and the upper end respectively passes through the support hole (74) and is slidably connected to the crank arm slide rod (83) located inside the rotating shaft sleeve (7); the crank arm slide rod (83) is fixedly connected to the rotating shaft sleeve (7) through the slide rod connection hole (75); and on the side surface of the rotating shaft sleeve (7), there is also a crank arm fulcrum (76) corresponding to the push crank arm (82), the crank arm fulcrum (76) is located above the weight hole (73), and the push crank arm (82) is in contact connection with the rotating shaft sleeve (7) through the crank arm fulcrum (76); when the weight (81) rotates with the rotating shaft sleeve (7), a centrifugal force is generated, which pushes the push crank arm (82) outwards. Under the action of the crank arm fulcrum (76), the upper end of the push crank arm (82) moves relatively along the crank arm slide rod (83), and drives the scissor-type thrust arm (84) to move upwards through the push crank arm (82). Under the action of the scissor-type thrust arm (84), the variable-speed push rod (85) pushes the variable-speed push plate (86) upwards, and through the variable-speed push plate (86), the variable-speed gear rod (4) is pushed to move in the protective cylinder (6). Through the engagement connection between the variable-speed upper gear (43) in the variable-speed gear rod (4) and the large fan gear (34), the fan mechanism (3) and the motor tail rotor (1) are synchronously rotated through the variable-speed gear rod (4); under the action of the speed regulating mechanism (9), the variable-speed push plate (86) is pushed downwards, and through the variable-speed push plate (86), the variable-speed gear rod (4) is pushed to move in the protective cylinder (6), so that the variable-speed large gear (42) in the variable-speed gear rod (4) is engaged with the small fan gear (35), and the fan mechanism (3) and the motor tail rotor (1) are synchronously rotated through the variable-speed gear rod (4).

6. The heat dissipation device for high-efficiency energy saving of a variable-frequency motor according to claim 1, wherein: It also includes a plurality of connecting bolts (13). Between the fixed bracket (2) and the fan housing (10), between the variable-speed rod bracket (5) and the protective cylinder (6), and between the rotating shaft sleeve (7) and the motor tail rotor (1), they are all fixedly connected through the connecting bolts (13); in the variable-speed rod bracket (5), there is a through hole corresponding to the variable-speed gear rod (4), and the variable-speed gear rod (4) is rotatably connected to the variable-speed rod bracket (5) through the corresponding through hole; and the head gear (71) arranged at the top of the rotating shaft sleeve (7) and the rotating shaft sleeve (7) are made into an integral structure by using a metal material or a heat-resistant plastic material, or are fixedly connected into an integral structure by using a welding method.

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