Motor fan and motor

Abstract

The application provides a motor fan and a motor. The motor fan comprises a sleeve, a base and a plurality of fan blades. The sleeve is in the shape of a circular tube and is configured to be sleeved on an output shaft of the motor. The base is in the shape of a rotating body and is connected to an outer side wall of the sleeve, and the rotation axis of the base coincides with the axis of the sleeve. The fan blades are in the shape of a flat plate, are circumferentially distributed around the axis of the sleeve, are connected to the outer side wall of the sleeve and are connected to a target side of the base. The distance between the area of the target side, which is not connected to the fan blades, and the fan blades gradually increases along the extension direction of the strip-shaped connection area, which is the area of the target side connected to the fan blades. The scheme can improve the efficiency of the motor.

Description

Technical Field

[0001] This application relates to the field of motor heat dissipation technology, and in particular to a motor fan and a motor. Background Technology

[0002] To accelerate the heat dissipation of the motor, a motor fan is usually installed at the tail of the motor. How to optimize the motor fan to make the motor's heat dissipation efficiency higher is a relatively important issue.

[0003] Currently, the heat dissipation efficiency of a motor can generally be improved by increasing the diameter of the motor fan. Increasing the diameter of the motor fan increases the air intake of the motor, allowing more air to pass through the heat dissipation fins of the motor in the same amount of time, thus improving the motor's heat dissipation efficiency.

[0004] However, the rotation of the motor fan is driven by the output shaft of the motor. Increasing the diameter of the motor fan will increase the motor's air friction, resulting in greater motor losses and reduced motor efficiency. Utility Model Content

[0005] In view of this, the motor fan and motor provided in this application can improve motor efficiency.

[0006] According to a first aspect of the present application, a motor fan is provided, comprising: a sleeve, a base, and a plurality of fan blades; the sleeve is cylindrical and configured to be sleeved on the output shaft of a motor; the base is a rotating body and is connected to the outer side wall of the sleeve, and the rotation axis of the base coincides with the axis of the sleeve; the fan blades are flat and the plurality of fan blades are circumferentially distributed around the axis of the sleeve, the fan blades are connected to the outer side wall of the sleeve and to a target side of the base; along a strip-shaped connecting region gradually moving away from the extension direction of the sleeve, the distance between the area of ​​the target side not connected to the fan blade and the fan blade increases, wherein the strip-shaped connecting region is the area of ​​the target side connected to the fan blade.

[0007] In one possible implementation, the plane of symmetry of the fan blade perpendicular to the thickness direction of the fan blade is in the same plane as the axis of the sleeve.

[0008] In one possible implementation, the fan blade is a heptagonal flat plate, with a first side of the seven sides of the fan blade connected between a second side and a third side; the first side is connected to the target side surface, and the area of ​​the target side surface connected to the first side is the strip-shaped connection area; the second side is connected to the outer wall of the sleeve; along the strip-shaped connection area gradually away from the extension direction of the sleeve, the distance between the area of ​​the target side surface not connected to the first side and the third side increases.

[0009] In one possible implementation, the base surrounds the first end of the sleeve, and the plurality of fan blades are circumferentially distributed around the axis of the sleeve outside the second end of the sleeve; in the target cross section of the fan cut by the symmetry plane of any fan blade, the portions of the target side on both sides of the sleeve are straight segments, and the angle Q1 between the first side of any fan blade and the first axial direction of the sleeve is an acute angle, wherein the first axial direction is the direction from the origin of the end face of the second end of the sleeve to the origin of the end face of the first end of the sleeve.

[0010] In one possible implementation, in the target cross section, the supplementary angle Q2 between the first side and the third side of any fan blade is greater than Q1.

[0011] In one possible implementation, of the seven sides of the fan blade, the side that is not the first side and is adjacent to the second side is the fourth side; in the target cross section, the angle Q3 > Q2 between the fourth side of any fan blade and the second axial direction of the sleeve, wherein the second axial direction is the direction from the origin of the end face of the first end of the sleeve to the origin of the end face of the second end of the sleeve.

[0012] In one possible implementation, of the seven sides of the fan blade, the side that is not the second side and is adjacent to the fourth side is the fifth side, the side that is not the fourth side and is adjacent to the fifth side is the sixth side, and the side between the sixth side and the third side is the seventh side; in the target cross section, the angle Q4 between the fifth side and the sixth side of any fan blade is an obtuse angle, the sixth side is perpendicular to the axis of the sleeve, and the seventh side is parallel to the axis of the sleeve.

[0013] In one possible implementation, Q4 < Q1 + 90°, and the length L2 of the sixth side is greater than the length L1 of the seventh side.

[0014] In one possible implementation, Q1, Q2, Q3, Q4, the length L1 of the sixth side, and the length L2 of the seventh side satisfy the following formulas: 1.1*Q1≤Q2≤1.2*Q1; 1.3*Q1≤Q3≤1.35*Q1; 0.7*Q1+90°≤Q4≤0.8*Q1+90°; L2=0.75*L1.

[0015] According to a second aspect of the embodiments of this application, a motor is provided, including a motor fan as described in the first aspect or any implementation thereof.

[0016] As can be seen from the above technical solution, the motor fan includes a sleeve, a base, and multiple fan blades. The sleeve is sleeved on the output shaft of the motor, and the spiral-shaped base is connected to the outer wall of the sleeve. The flat fan blades are connected to the target side of the base and to the outer wall of the sleeve, so that there is a strip-shaped connection area in the target side that is connected to the fan blades. Along the strip-shaped connection area, the distance between the area of ​​the target side that is not connected to the fan blades and the fan blades increases. During the use of the motor fan, the output shaft can drive the sleeve to drive the base and multiple fan blades to rotate. Therefore, compared to a motor fan where there is no gap between the target side and the fan blades along the aforementioned extension direction, in the motor fan of this application, the distance between the area where the target side is not connected to the fan blades along the aforementioned extension direction and the fan blades gradually increases. That is, the distance between the target side and the fan blades along the aforementioned extension direction changes from no gap to a gap, and this gap gradually increases along the aforementioned extension direction, so that more of the air generated by the rotation of the fan blades can flow away from the axis of the sleeve through the gap between the target side and the fan blades. Considering that the multiple heat dissipation fins of the motor are circumferentially distributed on the outer surface of the machine body around the axis of the output shaft, The motor fan is mounted on the output shaft at the rear of the machine body, and the outer casing of the motor fan has a fan cover with an internal space connected to the gap between the heat dissipation fins. Moving more air away from the axis of the sleeve allows more air to flow from inside the fan cover to the gap between the heat dissipation fins, thereby accelerating the dissipation of heat transferred from the machine body to the heat dissipation fins. Compared to increasing the airflow to the gap between the heat dissipation fins by increasing the diameter of the motor fan, the motor fan in this application can increase the airflow to the gap between the heat dissipation fins without increasing the diameter, reducing motor wind friction, thereby reducing motor losses and improving motor efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a motor provided in one embodiment of this application;

[0018] Figure 2 This is a cross-sectional view of a motor provided in one embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of a motor fan according to an embodiment of this application;

[0020] Figure 4 This is a cross-sectional view of a motor fan according to an embodiment of this application;

[0021] Figure 5 It is a local fluid pressure cloud map inside the motor of the first type of motor fan with existing technology;

[0022] Figure 6 This is a partial fluid pressure cloud map inside the motor of a motor fan that has been installed according to an embodiment of this application;

[0023] Figure 7It is a local fluid velocity vector cloud map inside the motor of the first type of motor fan with existing technology;

[0024] Figure 8 It is a local fluid velocity vector cloud map inside the motor of a motor fan that has been installed according to an embodiment of this application;

[0025] Figure 9 This is a comparison chart of the friction loss of motors with three different types of motor fans installed.

[0026] Figure 10 This is a comparison chart of the noise levels of motors with three different types of motor fans installed.

[0027] Figure 11 This is a comparison chart of the temperatures of motors equipped with three different types of motor fans.

[0028] List of reference numerals in the attached diagram:

[0029] 1: Body; 2: Output shaft; 3: Heat dissipation fins

[0030] 4: Fan cover; 6: Sleeve; 7: Base

[0031] 71: Target side 8: Fan blade 81: First side

[0032] 82: Second side 83: Third side 84: Fourth side

[0033] 85: Fifth side 86: Sixth side 87: Seventh side Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0035] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] As mentioned earlier, to accelerate motor heat dissipation, a motor fan is usually installed at the rear of the motor. Optimizing this motor fan to improve heat dissipation efficiency is a crucial issue. Currently, increasing the fan diameter is a common way to improve heat dissipation. Increasing the fan diameter increases the airflow into the motor, allowing more air to pass through the cooling fins within the same timeframe, thus improving heat dissipation efficiency. However, since the fan's rotation is driven by the motor's output shaft, increasing the fan diameter increases air friction, leading to greater motor losses and reduced efficiency.

[0037] In this embodiment, the motor fan includes a sleeve, a base, and multiple fan blades. The sleeve is fitted onto the output shaft of the motor. The spiral-shaped base is connected to the outer wall of the sleeve. The flat fan blades are connected to the target side of the base and to the outer wall of the sleeve, creating a strip-shaped connection area on the target side that connects to the fan blades. This strip-shaped connection area gradually moves away from the extension direction of the sleeve, increasing the distance between the area on the target side not connected to the fan blades and the fan blades. During operation, the output shaft drives the sleeve to rotate the base and multiple fan blades. Therefore, compared to a motor fan where there is no gap between the target side and the fan blades along the aforementioned extension direction, in this motor fan, the distance between the area on the target side not connected to the fan blades along the aforementioned extension direction increases. That is, the distance between the target side and the fan blades changes from no gap to a gap along the aforementioned extension direction, and this gap gradually increases along the aforementioned extension direction. This allows more of the airflow generated by the fan blade rotation to flow away from the axis of the sleeve through the gap between the target side and the fan blades. Considering that multiple cooling fins of the motor are circumferentially distributed around the axis of the output shaft on the outer surface of the machine body... The motor fan is mounted on the output shaft at the rear of the machine body, and the outer casing of the motor fan has a fan cover with an internal space connected to the gap between the heat dissipation fins. Moving more air away from the axis of the sleeve allows more air to flow from inside the fan cover to the gap between the heat dissipation fins, thereby accelerating the dissipation of heat transferred from the machine body to the heat dissipation fins. Compared to increasing the airflow to the gap between the heat dissipation fins by increasing the diameter of the motor fan, the motor fan in this application can increase the airflow to the gap between the heat dissipation fins without increasing the diameter, reducing motor wind friction, thereby reducing motor losses and improving motor efficiency.

[0038] The motor fan and motor provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] This application provides a motor fan that is applied to a motor, specifically it can be installed at the tail end of the motor. Figure 1 This is a schematic diagram of the structure of a motor provided in one embodiment of this application. Figure 2 This is a cross-sectional view of a motor provided in one embodiment of this application. For example... Figure 1 and Figure 2 As shown, the motor includes a body 1, an output shaft 2, multiple heat dissipation fins 3, and a fan cover 4. The output shaft 2 is rotatably connected inside the body 1, and both ends of the output shaft 2 extend outside the body 1. Multiple heat dissipation fins 3 are distributed in a circle around the axis of the output shaft 2 on the outer surface of the body 1. The length direction of the heat dissipation fins 3 is parallel to the axis direction of the output shaft 2. There are gaps between adjacent heat dissipation fins 3. The fan cover 4 is installed at the tail of the body 1. The tail end of the output shaft 2 is located inside the fan cover 4. An air inlet hole for air intake is opened through the side wall of the fan cover 4 opposite to the motor fan. The gap between the inside of the fan cover 4 and the aforementioned heat dissipation fins 3 is connected.

[0040] Based on the aforementioned motor, the motor fan can be installed inside the fan cover 4 and connected to the tail of the output end, so that when the motor is working, rotating the output shaft 2 can drive the motor fan to rotate, and then the air outside the fan cover 4 can enter the fan cover 4 through the air inlet and then flow into the gap between the heat dissipation fins 3, so as to accelerate the dissipation of heat transferred from the body 1 to the heat dissipation fins 3 and accelerate the heat dissipation of the motor.

[0041] Figure 3 This is a schematic diagram of the structure of a motor fan according to an embodiment of this application, as shown below. Figure 3 As shown, the motor fan includes: a sleeve 6, a base 7, and multiple fan blades 8; the sleeve 6 is cylindrical and is configured to fit onto the output shaft 2 of the motor, specifically, the sleeve 6 can fit onto the tail of the output shaft 2; the base 7 is a rotating body, connected to the outer wall of the sleeve 6, and the axis of rotation of the base 7 coincides with the axis of the sleeve 6; the multiple fan blades 8 are circumferentially distributed around the axis of the sleeve 6, connected to the outer wall of the sleeve 6, and connected to the target side 71 of the base 7; the fan blades extend gradually away from the extension direction of the sleeve 6 along the strip-shaped connection area (this extension direction can be as follows). Figure 3 And introduced later Figure 4 As shown by arrow m in the figure, the distance between the area of ​​the target side 71 that is not connected to the fan blade 8 and the fan blade 8 increases. The strip-shaped connecting area is the area of ​​the target side 71 that is connected to the fan blade 8.

[0042] In this embodiment, the motor fan includes a sleeve 6, a base 7, and multiple fan blades 8. The sleeve 6 is sleeved on the output shaft 2 of the motor. The spiral-shaped base 7 is connected to the outer wall of the sleeve 6. The flat fan blades 8 are connected to the target side 71 of the base 7 and to the outer wall of the sleeve 6, so that there is a strip-shaped connection area in the target side 71 that is connected to the fan blades 8. The distance between the area of ​​the target side 71 that is not connected to the fan blades 8 and the fan blades 8 gradually increases along the extension direction of the sleeve 6. During the use of the motor fan, the output shaft 2 can drive the sleeve 6 to rotate the base 7 and the multiple fan blades 8. Therefore, compared to a motor fan where there is no gap between the target side 71 and the fan blade 8 along the aforementioned extension direction, in the motor fan of this application, the distance between the area where the target side 71 is not connected to the fan blade 8 along the aforementioned extension direction and the fan blade 8 gradually increases. That is, the distance between the target side 71 and the fan blade 8 changes from no gap to a gap along the aforementioned extension direction, and this gap gradually increases along the aforementioned extension direction, so that more of the air generated by the rotation of the fan blade 8 can flow away from the axis of the sleeve 6 through the gap between the target side 71 and the fan blade 8. Considering that the multiple heat dissipation fins 3 of the motor are circumferentially distributed around the axis of the output shaft 2 on the outside of the body 1, The surface, the motor fan is mounted on the output shaft 2 at the rear of the body 1, and the motor fan cover has a fan cover 4 that connects the internal space with the gap between the heat dissipation fins 3. More airflow moves away from the axis of the sleeve 6, which allows more air to flow from the inside of the fan cover 4 to the gap between the heat dissipation fins 3, thereby accelerating the dissipation of heat transferred from the body 1 to the heat dissipation fins 3. Compared with increasing the diameter of the motor fan to increase the airflow to the gap between the heat dissipation fins 3, the motor fan in this application can increase the airflow to the gap between the heat dissipation fins 3 without increasing the diameter, reducing motor wind friction, thereby reducing motor loss and improving motor efficiency.

[0043] Furthermore, since the motor fan of this application can reduce motor losses and achieve cost savings, and the integrated and modular design of the motor fan makes the motor fan feasible.

[0044] In one possible implementation, such as Figure 3 As shown, the plane of symmetry of the fan blade 8 perpendicular to the thickness direction of the fan blade 8 is in the same plane as the axis of the sleeve 6.

[0045] Therefore, compared to the fact that the symmetrical plane of the fan blade 8 is not on the same plane as the axis of the sleeve 6, more of the air generated by the rotation of the fan blade 8 in this application can flow away from the sleeve 6, so as to avoid the wind vortex and backflow phenomenon between the fan blades 8 as much as possible, increase the air volume flowing to the gap between the heat dissipation fins 3, and improve the heat dissipation efficiency of the cooling fan for the motor.

[0046] In one possible implementation, such as Figure 3As shown, the fan blade 8 is a heptagonal flat plate. The first side 81 of the seven sides of the fan blade 8 is connected between the second side 82 and the third side 83. The first side 81 is connected to the target side 71, and the area of ​​the target side 71 connected to the first side 81 is a strip-shaped connection area. The second side 82 is connected to the outer wall of the sleeve 6. Along the strip-shaped connection area, gradually moving away from the extension direction of the sleeve 6, the distance between the area of ​​the target side 71 not connected to the first side 81 and the third side 83 increases. Thus, all sides of the fan blade 8 are straight, which facilitates the production of the fan blade 8.

[0047] It should be noted that each apex corner of the fan blade 8 can be processed as a rounded corner or a square corner, etc., and this application embodiment does not limit this.

[0048] In one possible implementation, such as Figure 3 As shown, the base 7 surrounds the first end of the sleeve 6, and the aforementioned multiple fan blades 8 are circumferentially distributed around the axis of the sleeve 6 outside the second end of the sleeve 6. Figure 4 This is a cross-sectional view of a motor fan according to an embodiment of this application, as shown. Figure 3 and Figure 4 As shown, the target cross-section (i.e., the cross-section of the fan obtained by the aforementioned symmetry plane of any one of the fan blades 8) is... Figure 4 In the cross-section of the motor fan, the target side 71 is in the form of straight segments on both sides of the sleeve 6. The angle Q1 between the first side 81 of the fan blade 8 and the first axial direction of the sleeve 6 is an acute angle. The first axial direction is the direction from the origin of the end face of the second end of the sleeve 6 to the origin of the end face of the first end of the sleeve 6.

[0049] In this embodiment, in the target cross section obtained by cutting the symmetrical plane of any fan blade 8 (hereinafter referred to as the target fan blade), the portion of the target side 71 on both sides of the sleeve 6 is a straight segment, and the angle Q1 between the first side 81 of the fan blade 8 and the first axial direction of the sleeve 6 is an acute angle. Thus, the target side 71 gradually tilts away from the axis of the sleeve 6 along the first axial direction. After the motor fan is installed on the motor, the first axial direction is from the motor fan towards the body 1. The tilt of the target side 71 can minimize the generation of wind vortex and backflow near the inner wall of the motor fan cover 4, thereby allowing more air generated by the rotation of the fan blade 8 to flow towards the heat dissipation fin 3 through the gap between the target side 71 and the fan blade 8, improving the heat dissipation efficiency of the cooling fan for the motor.

[0050] It should be noted that the specific size of Q1 can be set by adjusting the angle and outer contour of the end cap of the body 1 at the tail of the body 1, and this embodiment of the application does not limit this.

[0051] In one possible implementation, such as Figure 3 and Figure 4As shown, in the target cross section, the supplementary angle Q2 between the first side 81 and the third side 83 of the target fan blade is greater than Q1. Therefore, Q2 is larger, which can make the distance between the area of ​​the target side 71 that is not connected to the fan blade 8 and the fan blade 8 increase faster along the above-mentioned extension direction. This allows more air generated by the rotation of the fan blade 8 to flow towards the heat dissipation fin 3 through the gap between the target side 71 and the fan blade 8, thereby improving the heat dissipation efficiency of the cooling fan for the motor.

[0052] In one possible implementation, such as Figure 3 and Figure 4 As shown, among the seven sides of the fan blade 8, the side that is not the first side 81 and is adjacent to the second side 82 is the fourth side 84; in the target cross section, the angle Q3 > Q2 between the fourth side 84 of the target fan blade and the second axis direction of the sleeve 6, where the second axis direction is the direction from the origin of the end face of the first end of the sleeve 6 to the origin of the end face of the second end of the sleeve 6.

[0053] Therefore, a larger Q3 allows more air to be drawn towards the motor fan along the aforementioned first axis, resulting in a larger airflow from the motor fan and improving the motor fan's heat dissipation efficiency.

[0054] In one possible implementation, such as Figure 3 and Figure 4 As shown, among the seven sides of the fan blade 8, the side that is not the second side 82 and is adjacent to the fourth side 84 is the fifth side 85, the side that is not the fourth side 84 and is adjacent to the fifth side 85 is the sixth side 86, and the side between the sixth side 86 and the third side 83 is the seventh side 87. In the target cross section, the angle Q4 between the fifth side 85 and the sixth side 86 of the target fan blade is an obtuse angle, the sixth side 86 is perpendicular to the axis of the sleeve 6, and the seventh side 87 is parallel to the axis of the sleeve 6.

[0055] Therefore, the sixth side 86 perpendicular to the axis of the sleeve 6 and the seventh side 87 parallel to the axis of the sleeve 6 can facilitate the determination of the inner and outer diameters of the circumference of all the fan blades 8 in the motor fan, and thus facilitate the determination of the size of the motor fan.

[0056] In one possible implementation, such as Figure 3 and Figure 4 As shown, Q4 < Q1 + 90°, which is larger than Q1. A smaller Q4 can reduce the pressure transmitted to the connection between the fifth side 85 and the sixth side 86 when air is drawn into the motor fan along the first axis direction, thereby reducing the wear of the fan blades 8 and extending the service life of the motor fan.

[0057] In one possible implementation, such as Figure 3 and Figure 4 As shown, the length L2 of the sixth side 86 is greater than the length L1 of the seventh side 87.

[0058] Therefore, L2 > L1, which means that the difference between the outer diameter D2 and the inner diameter D1 of the circular track surface formed after the sixth side 86 rotates around the axis of the sleeve 6 is greater than twice L1. The large difference between D2 and D1 can drive more air from outside the fan cover 4 into the fan cover 4 and flow to the motor fan when the fan blade 8 rotates, thereby improving the efficiency of the motor fan in cooling the motor.

[0059] In one possible implementation, such as Figure 3 and Figure 4 As shown, Q1, Q2, Q3, Q4, L1, and L2 satisfy the following formula:

[0060] 1.1*Q1≤Q2≤1.2*Q1

[0061] 1.3*Q1≤Q3≤1.35*Q1

[0062] 0.7*Q1+90°≤Q4≤0.8*Q1+90°

[0063] L2 = 0.75 * L1

[0064] Optionally, after determining Q1, Q2, Q3, Q4, L1, and L2, the distance L2 between the first end of the second side 82 of the fan blade 8 (the end where the second side 82 connects to the first side 81) and the first end of the sleeve 6 can be determined by strength simulation, and the distance L3 between the second end of the second side 82 of the fan blade 8 (the end where the second side 82 connects to the fourth side 84) and the second end of the sleeve 6 can be determined. Under the condition of mild stress, L2 and L3 are minimized.

[0065] The airflow conditions within the electric motor fan using this application and the first type of electric motor fan in the prior art are as follows:

[0066] Figure 5 This is a local fluid pressure cloud map inside the motor of the first type of motor fan with existing technology. It is mainly used to show the pressure distribution of the flowing air inside the fan shroud 4 included in the motor. Figure 6 It is a local fluid pressure cloud map inside the motor of a motor fan that has been installed according to an embodiment of this application. It is mainly used to show the pressure distribution of the flowing air inside the fan shroud 4 included in the motor. Figure 7 This is a local fluid velocity vector cloud map of the motor of the first type of motor fan with existing technology. It is mainly used to show the velocity vector of the flowing air within the fan shroud 4 included in the motor. Figure 7 The four regions A, B, C, and D exhibited several noticeable eddies and backflow phenomena. Figure 8It is a local fluid velocity vector cloud map inside the motor of a motor fan that has been installed according to an embodiment of this application. It is mainly used to show the velocity vector of the flowing air inside the fan shroud 4 included in the motor.

[0067] contrast Figure 5 and Figure 6 and compare Figure 7 and Figure 8 It can be seen that, compared with the prior art, the motor fan in this application can make the part of the air with higher pressure in the fan cover 4 further away from the axis of the sleeve 6, and the motor fan in this application can make more air flow in the fan cover 4 to the heat dissipation fins 3 of the motor, so as to avoid the generation of eddies and backflow phenomena in the fan cover 4 as much as possible.

[0068] The following is a comparison of the friction loss, motor noise, and motor temperature rise of a motor equipped with a motor fan according to one embodiment of this application, a motor equipped with a first type of motor fan from the prior art, and a motor equipped with a second type of motor fan from the prior art:

[0069] Figure 9 This is a comparison diagram of the friction loss of motors equipped with the three different types of motor fans described above. Line a shows the friction loss of the motor equipped with the first type of motor fan from the prior art when the outer diameter of the motor fan is different; line b shows the friction loss of the motor equipped with the second type of motor fan from the prior art when the outer diameter of the motor fan is different; and line c shows the friction loss of the motor equipped with the motor fan of one embodiment of this application when the outer diameter of the motor fan is different. Figure 10 This is a comparison diagram of the noise levels of motors equipped with the three different types of motor fans described above. Line d shows the noise level of the motor equipped with the first type of motor fan from the prior art when the outer diameter of the motor fan is different; line e shows the noise level of the motor equipped with the second type of motor fan from the prior art when the outer diameter of the motor fan is different; and line f shows the noise level of the motor equipped with the motor fan from one embodiment of this application when the outer diameter of the motor fan is different. Figure 11 This is a comparison chart of the temperatures (specifically, the motor bearing temperatures) of motors equipped with the three different types of motor fans described above. Line g is used to show the temperature of the motor equipped with the first type of motor fan in the prior art when the outer diameter of the motor fan is different. Line h is used to show the temperature of the motor equipped with the second type of motor fan in the prior art when the outer diameter of the motor fan is different. Line k is used to show the temperature of the motor equipped with the motor fan of one embodiment of this application when the outer diameter of the motor fan is different.

[0070] It should be noted that the outer diameter of the motor fan in one embodiment of this application is the outer diameter D2 mentioned above.

[0071] from Figure 9 , Figure 10 and Figure 11 It can be seen that the motor with the motor fan of one embodiment of this application has lower friction loss, noise and temperature, and better performance.

[0072] This application also provides an electric motor, which includes the above-described motor fan.

[0073] The specific implementation method of the motor has been described above, and will not be repeated here.

[0074] It should be noted that the motor in this embodiment includes the motor fan in the previous embodiment and has corresponding beneficial effects, which will not be repeated here.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0076] Finally, it should be noted that the above are merely preferred embodiments of this application, used only to illustrate the technical solution of this application, and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application are included within the scope of protection of this application.

Claims

1. A motor fan, characterized in that, include: Sleeve (6), base (7) and multiple fan blades (8); The sleeve (6) is in the shape of a round tube and is configured to be sleeved on the output shaft (2) of the motor; The base (7) is in the shape of a rotating body. The base (7) is connected to the outer wall of the sleeve (6), and the axis of rotation of the base (7) coincides with the axis of the sleeve (6). The fan blade (8) is flat, and the plurality of fan blades (8) are circumferentially distributed around the axis of the sleeve (6). The fan blade (8) is connected to the outer wall of the sleeve (6) and to the target side (71) of the base (7). As the strip-shaped connection area gradually moves away from the extension direction of the sleeve (6), the distance between the area of ​​the target side (71) that is not connected to the fan blade (8) and the fan blade (8) increases, wherein the strip-shaped connection area is the area of ​​the target side (71) that is connected to the fan blade (8).

2. The motor fan according to claim 1, characterized in that, The plane of symmetry of the fan blade (8) perpendicular to the thickness direction of the fan blade (8) is in the same plane as the axis of the sleeve (6).

3. The motor fan according to claim 2, characterized in that, The fan blade (8) is in the shape of a heptagonal plate, and the first side (81) of the seven sides of the fan blade (8) is connected between the second side (82) and the third side (83); The first side (81) is connected to the target side (71), and the area in the target side (71) that is connected to the first side (81) is the strip-shaped connecting area; The second side (82) is connected to the outer wall of the sleeve (6); As the strip-shaped connecting area moves away from the extension direction of the sleeve (6), the distance between the area of ​​the target side (71) that is not connected to the first side (81) and the third side (83) increases.

4. The motor fan according to claim 3, characterized in that, The base (7) surrounds the first end of the sleeve (6), and the plurality of fan blades (8) are circumferentially distributed around the axis of the sleeve (6) outside the second end of the sleeve (6); In the target cross section of the fan obtained by the symmetry plane of any fan blade (8), the target side (71) on both sides of the sleeve (6) is a straight segment, and the angle Q1 between the first side (81) of any fan blade (8) and the first axial direction of the sleeve (6) is an acute angle, wherein the first axial direction is the direction from the origin of the end face of the second end of the sleeve (6) to the origin of the end face of the first end of the sleeve (6).

5. The motor fan according to claim 4, characterized in that, In the target cross section, the supplementary angle Q2 between the first side (81) and the third side (83) of any fan blade (8) is greater than Q1.

6. The motor fan according to claim 5, characterized in that, Of the seven sides of the fan blade (8), the side that is not the first side (81) and is adjacent to the second side (82) is the fourth side (84); In the target cross section, the angle Q3 > Q2 between the fourth side (84) of any fan blade (8) and the second axial direction of the sleeve (6), wherein the second axial direction is the direction from the origin of the end face of the first end of the sleeve (6) to the origin of the end face of the second end of the sleeve (6).

7. The motor fan according to claim 6, characterized in that, Of the seven sides of the fan blade (8), the side that is not the second side (82) and is adjacent to the fourth side (84) is the fifth side (85), the side that is not the fourth side (84) and is adjacent to the fifth side (85) is the sixth side (86), and the side between the sixth side (86) and the third side (83) is the seventh side (87). In the target cross section, the angle Q4 between the fifth side (85) and the sixth side (86) of any fan blade (8) is an obtuse angle, the sixth side (86) is perpendicular to the axis of the sleeve (6), and the seventh side (87) is parallel to the axis of the sleeve (6).

8. The motor fan according to claim 7, characterized in that, Q4 < Q1 + 90°, and the length L2 of the sixth side (86) is greater than the length L1 of the seventh side (87).

9. The motor fan according to any one of claims 7-8, characterized in that, Q1, Q2, Q3, Q4, the length L1 of the sixth side (86), and the length L2 of the seventh side (87) satisfy the following formula: 1.1*Q1≤Q2≤1.2*Q1; 1.3*Q1≤Q3≤1.35*Q1; 0.7*Q1+90°≤Q4≤0.8*Q1+90°; L2 = 0.75 * L1.

10. An electric motor, characterized in that, Includes the motor fan as described in any one of claims 1-9.

Images