Heat dissipation device and motor

Abstract

The invention provides a heat dissipation device and a motor, the heat dissipation device comprises a fixing groove and fan blades, and a groove wedge is arranged in the fixing groove. A mounting groove is formed in the slot wedge, the fan blade is inserted into the mounting groove and can move in the radial direction of the slot wedge, the radial direction of the slot wedge is the direction in which the fan blade extends out relative to the mounting groove, and elastic components are connected to the two sides of the fan blade respectively. When the rotating speed of the fan blades is increased, the fan blades move inwards in the radial direction of the mounting groove, and the rotating angle of the fan blades is increased. When the rotating speed of the fan blades is reduced, the fan blades move outwards in the radial direction of the mounting groove, and the rotating angle of the fan blades is reduced. The elastic parts are arranged on the two sides of the fan blades correspondingly, under the combined action of the elastic parts on the two sides, the rotating angle of the fan blades and the extending amount of the fan blades relative to the mounting groove can be adjusted in a self-adaptive mode according to the rotating speed of the fan blades, and therefore the heat dissipation device has the good heat dissipation effect at the low rotating speed; and the wind resistance loss at a high rotating speed is relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of motor heat dissipation, and in particular to a heat dissipation device and a motor. Background Art

[0002] The motor will generate a lot of heat during operation. In order to prevent the heat from affecting the motor performance, a heat dissipation structure is generally used to enhance the heat dissipation capacity of the motor. Compared with liquid cooling and heat dissipation fan cooling, fan cooling has lower cost and is easier to implement. Therefore, fan cooling is currently a commonly used heat dissipation method in the motor field. The fan blades are usually fixed to the exposed part of the motor's rotor shaft. When the motor rotates, the rotor shaft will drive the fan blades to rotate synchronously, guiding the airflow through the motor casing surface. The airflow takes away the heat generated by the motor during operation, thereby improving the motor's heat dissipation capacity.

[0003] For asynchronous motors with constant speed, when selecting cooling fan blades, you only need to consider the heat dissipation under the rated power of the motor. For motors with low rated power, the fan blade speed is low, the heat dissipation airflow generated is small, and large blades need to be selected; for motors with high rated power, the fan blade speed is high, the heat dissipation airflow generated is large, and small blades can meet the motor heat dissipation conditions.

[0004] In recent years, the speed of variable frequency motors can be adjusted over a wide range under the regulation of controllers. For speed-adjustable motors, the selection of cooling fan blades needs to consider a variety of factors. If small blades are directly selected, the heat dissipation of the small blades may be insufficient when the motor speed is low; if large blades are directly selected, the large blades may increase the windage loss of the motor when the motor speed is high, reducing the motor efficiency.

[0005] There are two common solutions to the problem that the fan blade area cannot meet the different speeds of the speed-regulating motor. The first method is to use medium-sized blades to reduce the wind resistance loss of the fan blades under high-speed conditions. However, the heat dissipation effect of the motor is poor when it runs at some low speed points, and other heat dissipation methods need to be combined; the wind resistance loss of the motor is high when it runs at some high speed points, resulting in a decrease in motor efficiency. The second method is to use a fan with a speed sensor to adjust the air volume according to the real-time working conditions of the motor, but installing a speed sensor on the fan will increase the cost of the motor. Summary of the invention

[0006] In order to overcome the problems existing in the related technology, one of the objects of the present invention is to provide a heat dissipation device, which can adaptively adjust the rotation angle of the fan blade and the extension amount of the fan blade relative to the mounting slot according to the rotation speed of the fan blade, so that the heat dissipation device of the present invention has a better heat dissipation effect at low speed and lower wind resistance loss at high speed.

[0007] A heat dissipation device comprises a fixing slot and a fan blade, wherein a slot wedge is arranged in the fixing slot; the slot wedge is provided with a mounting slot, the fan blade is inserted into the mounting slot, and the fan blade can move along the radial direction of the slot wedge, and the radial direction of the slot wedge is the direction in which the fan blade extends relative to the mounting slot; elastic components are respectively connected to both sides of the fan blade, and the elastic components are used to adjust the rotation angle of the fan blade.

[0008] In a preferred technical solution of the present invention, the fixing groove and the slot wedge clearance cooperate to radially limit the fan blade.

[0009] In a preferred technical solution of the present invention, the heat dissipation device further comprises a rotating structure, and a plurality of the fixing grooves are circumferentially arranged on an outer side wall of the rotating structure.

[0010] In a preferred technical solution of the present invention, the diameter of the slot wedge is d1, the diameter of the fixing slot is d2, and 1.05≤d2 / d1<1.1.

[0011] In a preferred technical solution of the present invention, a clamping groove is provided at an end surface of the fixing groove close to the rotating structure, and a blocking piece is provided in the clamping groove.

[0012] In a preferred technical solution of the present invention, a limiting surface is provided between the fixing groove and the outer side wall of the rotating structure, and the limiting surface is adapted to the side surface of the fan blade.

[0013] In a preferred technical solution of the present invention, an end surface of the rotating structure is provided with an opening, and the opening is used for installing a driving member.

[0014] In a preferred technical solution of the present invention, the heat dissipation device also includes a base plate, to which the rotating structure is connected, a first end of the elastic component is connected to the fan blade, and a second end of the elastic component is connected to the base plate.

[0015] In a preferred technical solution of the present invention, the maximum value of the rotation angle ranges from 40 degrees to 45 degrees.

[0016] A second object of the present invention is to provide a motor comprising the heat dissipation device described in any one of the above items.

[0017] In a preferred technical solution of the present invention,

[0018] The beneficial effects of the present invention are:

[0019] A heat dissipation device provided by the present invention comprises a fixed groove and a fan blade, wherein a slot wedge is arranged in the fixed groove; the slot wedge is provided with an installation groove, the fan blade is inserted into the installation groove, and the fan blade can move along the radial direction of the slot wedge, and the radial direction of the slot wedge is the direction in which the fan blade extends relative to the installation groove; elastic components are respectively connected to both sides of the fan blade, and the elastic components are used to adjust the rotation angle of the fan blade. The slot wedge is placed in the fixed groove, and then the fan blade is inserted into the installation groove on the slot wedge. The slot wedge rotates clockwise or counterclockwise in the fixed groove, driving the fan blade to rotate clockwise or counterclockwise. When the fan blade is stationary, the elastic components on both sides of the fan blade are at their original length, which plays a fixing role on the fan blade. When the fan blade rotates counterclockwise, the spring on one side of the fan blade is compressed, and the spring on the other side of the fan blade is stretched. When the rotation speed of the fan blade increases, the wind resistance increases, the spring on one side of the fan blade is further compressed, the compression amount increases, and the spring on the other side of the fan blade is stretched, and the stretching amount increases. At this time, the fan blade moves inward along the radial direction of the mounting groove, that is, the length of the fan blade extending out of the mounting groove decreases, and the rotation angle of the fan blade increases. When the rotation speed of the fan blade decreases, the wind resistance decreases, and the spring in the compressed state and the spring in the extended state both apply elastic force to the fan blade, causing the fan blade to move back. At this time, the fan blade moves outward along the radial direction of the mounting groove, that is, the length of the fan blade extending out of the mounting groove increases, and the rotation angle of the fan blade decreases. The present invention is provided with elastic components on both sides of the fan blade, and under the joint action of the elastic components on both sides, the rotation angle of the fan blade and the extension amount relative to the mounting groove can be adaptively adjusted according to the rotation speed of the fan blade, so that the heat dissipation device of the present invention has a better heat dissipation effect at low rotation speed and a lower wind resistance loss at high rotation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the heat dissipation device of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of a fan blade installed on a slot wedge of the present invention;

[0022] Figure 3 is a side view of a fan blade mounted on a slot wedge according to the present invention;

[0023] Figure 4 is a schematic diagram of the rotation angle of the fan blade when the fan blade of the present invention rotates;

[0024] Figure 5 It is a structural schematic diagram of the rotating structure of the present invention;

[0025] Figure 6 is a top view of the rotating structure of the present invention;

[0026] Figure 7 is a top view of the heat dissipation device with baffles installed according to the present invention;

[0027] Figure 8It is a structural schematic diagram of a heat dissipation device with baffles installed according to the present invention;

[0028] Fig. 9 is a top view of the heat dissipation device of the present invention without a baffle installed;

[0029] Fig.10 is a schematic diagram of the position of the fan blades of the present invention in the motor;

[0030] Fig.11 It is a relationship diagram between the motor efficiency improvement value and the motor speed of the present invention.

[0031] Figure numerals: 1, fixing groove; 2, fan blade; 3, slot wedge; 4, mounting groove; 5, elastic component; 6, rotating structure; 7, card slot; 8, baffle; 9, limiting surface; 10, opening; 11, bottom plate. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] Example 1

[0034] like Figure 1-Figure 5 As shown, this embodiment provides a heat dissipation device, including a fixing slot 1 and a fan blade 2, wherein a slot wedge 3 is arranged in the fixing slot 1; the slot wedge 3 is provided with a mounting slot 4, the fan blade 2 is inserted into the mounting slot 4, and the fan blade 2 can move along the radial direction of the slot wedge 3, and the radial direction of the slot wedge 3 is the direction in which the fan blade 2 extends relative to the mounting slot 4; elastic components 5 are respectively connected to both sides of the fan blade 2, and the elastic components 5 are used to adjust the rotation angle of the fan blade 2.

[0035] The fixed slot 1 and the slot wedge 3 have the same shape, both of which are cylindrical, and the slot wedge 3 fits the fixed slot 1. The slot wedge 3 is pressed into the fixed slot 1, and the slot wedge 3 can rotate clockwise or counterclockwise in the fixed slot 1. The first end of the fan blade 2 fits with the mounting slot 4, and the first end of the fan blade 2 is inserted into the mounting slot 4. The second end of the fan blade 2 is in a broken line shape, and the slot wedge 3 drives the fan blade 2 to rotate clockwise or counterclockwise.

[0036] When the fan blade 2 is stationary, the elastic components 5 on both sides of the fan blade 2 are at their original lengths. Under the joint action of the elastic components 5 on both sides of the fan blade 2, the fan blade 2 is fixed. The outer diameter of the fan blade 2 is the length of the fan blade 2 extending relative to the mounting slot 4. The radial direction of the slot wedge 3 is Fig. 9When the fan blade 2 rotates clockwise or counterclockwise, the spring on one side is in a compressed state, and the spring on the other side is in an extended state.

[0037] Since the fan blades 2 are on the circumference, the fan blades 2 will be affected by the centripetal force during the rotation process, and the centripetal force on the fan blades 2 is positively correlated with the rotation speed. Figure 4 As shown, when the rotation speed of the blade 2 increases, the centripetal force on the blade 2 increases. The blade 2 moves inward along the radial direction of the mounting groove 4, and the outer diameter of the blade 2 decreases. The rotation angle θ of the blade 2 increases, and the spring connected to the blade 2 and in a compressed state is further compressed, and the compression amount increases; the spring connected to the blade 2 and in an extended state is further extended, and the extension amount increases. When the rotation speed of the blade 2 decreases, the centripetal force on the blade 2 decreases. The blade 2 moves outward along the radial direction of the mounting groove 4, and the outer diameter of the blade 2 increases. The rotation angle θ of the blade 2 decreases, and the spring connected to the blade 2 and in a compressed state is extended, and the compression amount decreases; the spring connected to the blade 2 and in an extended state is shortened, and the extension amount decreases.

[0038] The elastic component 5 of this embodiment may be a spring or a torsion spring, which is not limited here.

[0039] A heat dissipation device provided in this embodiment includes a fixed groove 1 and a fan blade 2, wherein a slot wedge 3 is arranged in the fixed groove 1; the slot wedge 3 is provided with a mounting groove 4, the fan blade 2 is inserted into the mounting groove 4, and the fan blade 2 can move along the radial direction of the slot wedge 3, and the radial direction of the slot wedge is the direction in which the fan blade extends relative to the mounting groove; elastic components 5 are respectively connected to both sides of the fan blade 2, and the elastic components 5 are used to adjust the rotation angle of the fan blade 2. The slot wedge 3 is placed in the fixed groove 1, and then the fan blade 2 is inserted into the mounting groove 4 on the slot wedge 3. The slot wedge 3 rotates clockwise or counterclockwise in the fixed groove 1, driving the fan blade 2 to rotate clockwise or counterclockwise. When the fan blade 2 is stationary, the elastic components 5 on both sides of the fan blade 2 are at their original length, which plays a fixing role on the fan blade 2. When the fan blade 2 rotates counterclockwise, the spring on one side of the fan blade 2 is compressed, and the spring on the other side of the fan blade 2 is stretched. When the rotation speed of the fan blade 2 increases, the wind resistance increases, the spring on one side of the fan blade 2 is further compressed, the compression amount increases, and the spring on the other side of the fan blade 2 is stretched, and the stretching amount increases. At this time, the fan blade 2 moves inward along the radial direction of the mounting groove 4, that is, the length of the fan blade 2 extending out of the mounting groove 4 decreases, and the rotation angle of the fan blade 2 increases. When the rotation speed of the fan blade 2 decreases, the wind resistance decreases, and the spring in the compressed state and the spring in the extended state both apply elastic force to the fan blade 2, so that the fan blade 2 moves back. At this time, the fan blade 2 moves outward along the radial direction of the mounting groove 4, that is, the length of the fan blade 2 extending out of the mounting groove 4 increases, and the rotation angle of the fan blade 2 decreases. The present invention is provided with elastic components 5 on both sides of the fan blade 2. Under the joint action of the elastic components 5 on both sides, the rotation angle of the fan blade 2 and the extension amount relative to the mounting groove 4 can be adaptively adjusted according to the rotation speed of the fan blade 2, so that the heat dissipation device of the present invention has a good heat dissipation effect at low speeds, and the wind resistance loss at high speeds is low.

[0040] Example 2

[0041] like Figure 1-Figure 5 As shown, this embodiment provides a heat dissipation device, including a fixing slot 1 and a fan blade 2, wherein a slot wedge 3 is arranged in the fixing slot 1; the slot wedge 3 is provided with a mounting slot 4, the fan blade 2 is inserted into the mounting slot 4, and the fan blade 2 can move along the radial direction of the slot wedge 3, and the radial direction of the slot wedge 3 is the direction in which the fan blade 2 extends relative to the mounting slot 4; elastic components 5 are respectively connected to both sides of the fan blade 2, and the elastic components 5 are used to adjust the rotation angle of the fan blade 2.

[0042] The fixed groove 1 and the slot wedge 3 are clearance-matched to radially limit the blade 2. After the slot wedge 3 is inserted into the fixed groove 1, it is ensured that the slot wedge 3 can drive the blade 2 to rotate. The assembly inner diameter of the fixed groove 1 is slightly larger than the assembly outer diameter of the slot wedge 3. There is a certain amount of clearance between the fixed groove 1 and the slot wedge 3, so that a clearance fit is formed between the fixed groove 1 and the slot wedge 3, thereby limiting the blade 2 in the radial direction and preventing the blade 2 from excessive radial movement.

[0043] like Figure 6 As shown, the heat dissipation device further includes a rotating structure 6, and a plurality of the fixing grooves 1 are circumferentially arranged on the outer side wall of the rotating structure 6.

[0044] The rotating structure 6 is a hollow cylinder, and the end face of the rotating structure 6 is a circular ring structure. A plurality of fixed grooves 1 are arranged circumferentially on the outer wall of the rotating structure 6, and the shape of the fixed grooves 1 is cylindrical. A plurality of slot wedges 3 can be put into the corresponding fixed grooves 1 at one time, and the rotating structure 6 rotates, driving the plurality of fan blades 2 to rotate, forming airflow in the motor, thereby dissipating heat from the motor, reducing the power consumption loss of the motor, and improving the efficiency of the motor.

[0045] In this embodiment, 7 fixing grooves 1 are circumferentially arranged on the outer wall of the rotating structure 6, a slot wedge 3 is arranged in each fixing groove 1, and the heat dissipation device includes 7 fan blades 2 in total.

[0046] The fixed slot 1 and the slot wedge 3 of this embodiment are clearance-matched to radially limit the fan blade 2. The heat dissipation device also includes a rotating structure 6, and a plurality of the fixed slots 1 are circumferentially arranged on the outer wall of the rotating structure 6. There is a certain amount of clearance between the fixed slot 1 and the slot wedge 3, so that a clearance fit is formed between the fixed slot 1 and the slot wedge 3, thereby limiting the fan blade 2 in the radial direction and preventing the fan blade 2 from excessive radial movement. Multiple slot wedges 3 are placed in the corresponding fixed slots 1 at one time, and the rotating structure 6 rotates, driving the multiple fan blades 2 to rotate, forming airflow in the motor, thereby dissipating the heat of the motor, reducing the power consumption loss of the motor, and improving the efficiency of the motor.

[0047] Example 3

[0048] like Figure 1-Figure 5 As shown, this embodiment provides a heat dissipation device, including a fixing slot 1 and a fan blade 2, wherein a slot wedge 3 is arranged in the fixing slot 1; the slot wedge 3 is provided with a mounting slot 4, the fan blade 2 is inserted into the mounting slot 4, and the fan blade 2 can move along the radial direction of the slot wedge 3, and the radial direction of the slot wedge 3 is the direction in which the fan blade 2 extends relative to the mounting slot 4; elastic components 5 are respectively connected to both sides of the fan blade 2, and the elastic components 5 are used to adjust the rotation angle of the fan blade 2.

[0049] like Figure 6 As shown, the heat dissipation device further includes a rotating structure 6, and a plurality of the fixing grooves 1 are circumferentially arranged on the outer side wall of the rotating structure 6.

[0050] like Figure 7-Figure 8 As shown, a clamping groove 7 is formed at the end surface of the fixing groove 1 close to the rotating structure 6 , and a blocking piece 8 is arranged in the clamping groove 7 .

[0051] The fixing grooves 1 extend along the axial direction of the rotating structure 6 and are evenly distributed on the outer side wall of the rotating structure 6 . The distances between adjacent fixing grooves 1 are equal, so that the fan blades 2 are evenly distributed on the outer side of the rotating structure 6 .

[0052] The rotating structure 6 is in the shape of a cylinder, and the fixed groove 1 is provided with a clamping groove 7 at the positions of the two end surfaces close to the rotating structure 6. The clamping groove 7 is in the shape of a ring, and the blocking piece 8 is inserted into the clamping groove 7. Under the action of the blocking pieces 8 on both sides of the fixed groove 1, the slot wedge 3 is fixed in the axial direction of the fixed groove 1, and the slot wedge 3 is prevented from axially jumping in the fixed groove 1.

[0053] When the rotating structure 6 rotates, the blade 2 will deviate under the action of inertia, and the blade 2 exerts a force on the slot wedge 3. Since the baffle blocks in the axial direction, the slot wedge 3 can only move in the radial direction of the installation slot 4, and cannot move in the axial direction of the installation slot 4. Since the blade 2 is inserted into the installation slot 4 on the slot wedge 3, the blade 2 can be prevented from axially jumping.

[0054] In this embodiment, the fixed slot 1 is provided with a clamping slot 7 at the end surface close to the rotating structure 6, and a baffle 8 is provided in the clamping slot 7. Under the action of the baffles 8 on both sides of the fixed slot 1, the slot wedge 3 is fixed in the axial direction of the fixed slot 1, preventing the slot wedge 3 from axially jumping in the fixed slot 1. Since the fan blade 2 is inserted into the mounting slot 4 on the slot wedge 3, the fan blade 2 can be prevented from axially jumping.

[0055] Example 4

[0056] like Figure 1-Figure 5 As shown, this embodiment provides a heat dissipation device, including a fixing slot 1 and a fan blade 2, wherein a slot wedge 3 is arranged in the fixing slot 1; the slot wedge 3 is provided with a mounting slot 4, the fan blade 2 is inserted into the mounting slot 4, and the fan blade 2 can move along the radial direction of the slot wedge 3, and the radial direction of the slot wedge 3 is the direction in which the fan blade 2 extends relative to the mounting slot 4; elastic components 5 are respectively connected to both sides of the fan blade 2, and the elastic components 5 are used to adjust the rotation angle of the fan blade 2.

[0057] like Figure 6 As shown, the heat dissipation device further includes a rotating structure 6, and a plurality of the fixing grooves 1 are circumferentially arranged on the outer side wall of the rotating structure 6.

[0058] A limiting surface 9 is provided between the fixing groove 1 and the outer side wall of the rotating structure 6 , and the limiting surface 9 is adapted to the side surface of the fan blade 2 .

[0059] An opening 10 is formed on the end surface of the rotating structure 6 , and the opening 10 is used for installing a driving member.

[0060] The driving member of this embodiment is a rotor of a motor, which is installed in the opening 10 and connected to the inner wall of the rotating structure 6. The motor is plugged into a power cord, and when the motor is started, the rotor drives the rotating structure 6 to start rotating, and the rotating structure 6 drives the fan blades 2 to rotate.

[0061] like Figure 5 and Figure 8 As shown, the outer side wall of the rotating structure 6 is provided with a limiting surface 9, and the limiting surface 9 is adapted to the side of the fan blade 2. The limiting surface 9 is located between the fixed groove 1 and the arc-shaped outer side wall of the rotating structure 6. The limiting surface is an arc-shaped surface with a certain curvature, and the first end of the limiting surface is connected to the edge of the fixed groove 1, and the second end is connected to the outer side wall of the rotating structure 6. When the fan blade 2 rotates with the slot wedge 3, the limiting surface 9 can clamp the side of the fan blade 2, thereby limiting the rotation angle of the fan blade 2. When the side of the fan blade 2 abuts against the limiting surface 9, the rotation angle of the fan blade 2 reaches the maximum value, and the fan blade 2 cannot continue to move. The maximum value of the rotation angle ranges from 40 degrees to 45 degrees. In this embodiment, the maximum value of the rotation angle of the fan blade 2 is 45 degrees as an example. The limiting surface 9 allows the fan blade 2 to rotate within an angle range, and the angle range is preferably 0-45 degrees to prevent the rotation angle of the fan blade 2 from being too large.

[0062] Notches are provided at both ends of the fixing groove 1, and the notches are located on the end faces of the rotating structure 6, and the shape of the notches is a part of a circle. Adjusting the size of the notches can adjust the maximum value of the rotation angle of the fan blade 2. The larger the notch, the larger the maximum value of the rotation angle of the fan blade 2; the smaller the notch, the smaller the maximum value of the rotation angle of the fan blade 2.

[0063] In this embodiment, a limiting surface is arranged between the fixed groove 1 and the outer side wall of the rotating structure 6, and the limiting surface is adapted to the side of the fan blade 2. An opening 10 is provided on the end face of the rotating structure 6, and the opening 10 is used to install a driving member. The limiting surface is an arc-shaped surface with a certain curvature, and the first end of the limiting surface is connected to the edge of the fixed groove 1, and the second end is connected to the outer side wall of the rotating structure 6. When the fan blade 2 rotates with the slot wedge 3, the limiting surface 9 can clamp the side of the fan blade 2, thereby limiting the rotation angle of the fan blade 2. When the side of the fan blade 2 abuts against the limiting surface 9, the rotation angle of the fan blade 2 reaches the maximum value, and the fan blade 2 cannot continue to move.

[0064] Example 5

[0065] like Figure 1-Figure 5As shown, this embodiment provides a heat dissipation device, including a fixing slot 1 and a fan blade 2, wherein a slot wedge 3 is arranged in the fixing slot 1; the slot wedge 3 is provided with a mounting slot 4, the fan blade 2 is inserted into the mounting slot 4, and the fan blade 2 can move along the radial direction of the slot wedge 3, and the radial direction of the slot wedge 3 is the direction in which the fan blade 2 extends relative to the mounting slot 4; elastic components 5 are respectively connected to both sides of the fan blade 2, and the elastic components 5 are used to adjust the rotation angle of the fan blade 2.

[0066] like Figure 6 As shown, the heat dissipation device further includes a rotating structure 6, and a plurality of the fixing grooves 1 are circumferentially arranged on the outer side wall of the rotating structure 6.

[0067] When the rotating structure 6 is stationary, the elastic components 5 on both sides of the blade 2 fix the blade 2. When the rotating structure 6 rotates clockwise, the blade 2 will deviate in the counterclockwise direction, the elastic component 5 on one side of the blade 2 will be compressed, and the elastic component 5 on the other side of the blade 2 will be stretched. When the rotating structure 6 rotates counterclockwise, the blade 2 will deviate in the clockwise direction, the elastic component 5 on one side of the blade 2 will be stretched, and the elastic component 5 on the other side of the blade 2 will be compressed.

[0068] When the speed increases, the wind resistance increases, the rotation angle of the blade 2 increases, and the blade 2 moves inward along the radial direction of the mounting groove 4, that is, the length of the blade 2 extending relative to the mounting groove 4 decreases, and the elastic components 5 on both sides of the blade 2 will be further compressed or stretched. Since the edge of the fixing groove 1 is provided with a limited surface, when the side of the blade 2 abuts against the limited surface, the limited surface clamps the blade 2, and the rotation angle of the blade 2 reaches the maximum value at this time. The maximum value of the rotation angle ranges from 40 degrees to 45 degrees. In this embodiment, the maximum value of the rotation angle is 45 degrees as an example.

[0069] When the rotation speed decreases, the wind resistance decreases, the elastic force of the elastic component 5 pushes the fan blade 2 back, the rotation angle of the fan blade 2 decreases, and the fan blade 2 moves outward along the radial direction of the installation groove 4, that is, the length of the fan blade 2 extending relative to the installation groove 4 increases.

[0070] Since the elastic components 5 are connected to both sides of the fan blade 2, the rotating structure 6 can automatically adjust the outer diameter of the fan blade 2 when rotating clockwise or counterclockwise. After the motor is started, the rotating structure 6 starts to drive the fan blade 2 to rotate. The fan blade 2 generates airflow during the rotation process, and the airflow passes through the surface of the motor, thereby dissipating the heat of the motor.

[0071] The heat dissipation device further includes a bottom plate 11 , to which the rotating structure 6 is connected. A first end of the elastic component 5 is connected to the fan blade 2 , and a second end of the elastic component 5 is connected to the bottom plate 11 .

[0072] The rotating structure 6 and the bottom plate 11 are coaxially arranged, and the rotating structure 6 can be fixed to the bottom plate 11 or detachably connected to the bottom plate 11, which is not limited here. In combination with the elastic components 5 on both sides of the fan blades 2, the fan blades 2 can be fixed to the bottom plate 11. In this embodiment, the shape of the bottom plate 11 is circular as an example, and the fan blades 2 can rotate circumferentially along the outer periphery of the bottom plate 11. The elastic component 5 can be a spring or a compression spring, which is not limited here.

[0073] like Figure 3 and Figure 6 As shown, the diameter of the slot wedge 3 is d1, the diameter of the fixing slot 1 is d2, and 1.05≤d2 / d1<1.1.

[0074] The diameter of the slot wedge 3 and the diameter of the fixed slot 1 are set according to the above formula, so that the diameter of the slot wedge 3 is slightly smaller than the diameter of the fixed slot 1, and the slot wedge 3 and the fixed slot 1 form a clearance fit. There is a certain amount of clearance between the slot wedge 3 and the fixed slot 1, so as to ensure that the fan blade 2 will not have excessive radial movement when rotating in the fixed slot 1.

[0075] The rated speed of the motor is 3000r / min. At this time, the radial rotation angle of the fan blade 2 is θ2, the maximum rotation angle is θ1, θ2<θ1, and the outer diameter of the fan blade 2 is D2. Refer to the parameters at this time to make a fan blade 2 with a non-adjustable area. Control the motor to run at the lowest speed point, the speed at the low speed point is 1800r / min, at this time the rotation angle of the fan blade 2 is θ3, the outer diameter of the fan blade 2 is D3, θ3<θ2, D3>D2. At this time, the diameter of the fan blade 2 is large, and the heat dissipation capacity is strong. After the motor runs stably for a period of time, the performance will not be affected by the heat of the motor.

[0076] The motor is controlled to run at a high speed point, the speed at the high speed point is 3600r / min, at this time, the rotation angle of the fan blade 2 is θ4, the outer diameter of the fan blade 2 is D4, θ1>θ4>θ2, D4<D2, at this time the outer diameter of the fan blade 2 is small, and the wind resistance loss is small. According to experiments, the heat dissipation device of this embodiment can adaptively adjust the outer diameter of the fan blade 2. In the high speed working range above the rated speed, compared with the fan blade 2 designed with reference to the rated speed point size parameters, the heat dissipation device of this embodiment can improve the motor efficiency.

[0077] like Fig.10 As shown, this embodiment also provides a motor, including the heat dissipation device described in any one of Embodiments 1 to 5. The motor will emit heat during operation, and the heat dissipation device can adaptively adjust the rotation angle and outer diameter of the fan blade 2 according to the speed of the motor, thereby increasing the air volume and improving the heat dissipation efficiency when the motor rotates at a low speed; and reducing the wind resistance loss and improving the motor efficiency when the motor rotates at a high speed, for example, when the motor speed is greater than the rated speed. Fig.11As shown, the motor efficiency improvement value of this embodiment is positively correlated with the motor speed, that is, the greater the motor speed, the greater the motor efficiency improvement value. The motor with the heat dissipation device of this embodiment has a higher motor efficiency under high speed conditions.

[0078] The diameter of the slot wedge 3 of the heat dissipation device of this embodiment is d1, and the diameter of the fixed slot 1 is d2, 1.05≤d2 / d1<1.1. The diameter of the slot wedge 3 and the diameter of the fixed slot 1 are set according to the above formula, so that the diameter of the slot wedge 3 is slightly smaller than the diameter of the fixed slot 1, and the slot wedge 3 and the fixed slot 1 form a clearance fit, thereby preventing the fan blade 2 from having excessive radial jump when rotating in the fixed slot 1.

[0079] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0080] It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would then be positioned "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0081] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, 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, characterized in that: It includes a fixing slot and a fan blade, wherein a slot wedge is arranged in the fixing slot; the slot wedge is provided with a mounting slot, the fan blade is inserted into the mounting slot, and the fan blade can move along the radial direction of the slot wedge, and the radial direction of the slot wedge is the direction in which the fan blade extends relative to the mounting slot; elastic components are respectively connected to both sides of the fan blade, and the elastic components are used to adjust the rotation angle of the fan blade.

2. The heat dissipation device according to claim 1, characterized in that: The fixing groove and the slot wedge are clearance-matched to radially limit the fan blade.

3. The heat dissipation device according to claim 1, characterized in that: It also includes a rotating structure, and a plurality of the fixing grooves are circumferentially arranged on the outer side wall of the rotating structure.

4. The heat dissipation device according to claim 1, characterized in that: The diameter of the slot wedge is d1, the diameter of the fixing slot is d2, and 1.05≤d2 / d1<1.

1.

5. The heat dissipation device according to claim 3, characterized in that: A clamping groove is formed at the end surface of the fixing groove close to the rotating structure, and a blocking piece is arranged in the clamping groove.

6. The heat dissipation device according to claim 3, characterized in that: A limiting surface is arranged between the fixing groove and the outer side wall of the rotating structure, and the limiting surface is adapted to the side surface of the fan blade.

7. The heat dissipation device according to claim 3, characterized in that: An opening is formed on the end surface of the rotating structure, and the opening is used for installing a driving member.

8. The heat dissipation device according to claim 3, characterized in that: It also includes a bottom plate, to which the rotating structure is connected, a first end of the elastic component is connected to the fan blade, and a second end of the elastic component is connected to the bottom plate.

9. The heat dissipation device according to any one of claims 1 to 8, characterized in that: The maximum value of the rotation angle ranges from 40 degrees to 45 degrees.

10. A motor, characterized in that: A heat dissipation device comprising any one of claims 1 to 9.

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