Design method for reducing power consumption of cooling fan

Abstract

The invention provides a power consumption reduction design method of a cooling fan, which relates to the technical field of cooling fans and comprises the following steps: acquiring an outer frame, arranging a central column at the center of the outer frame, forming a first mounting hole and a second mounting hole in the central column from top to bottom, and forming a third mounting hole in the bottom of the second mounting hole; a magnet is mounted in the third mounting hole, and an elastic sheet is mounted on the magnet; a retaining ring, a gasket and a bearing are sequentially mounted in the first mounting hole from bottom to top; mounting a coil holder with a circuit board on the outer frame, then mounting a magnetic strip in the motor shell, and pressing the motor shell into the fan blades; the fan blade with the axis is installed on the outer frame, and the mushroom head at the lower end of the axis makes contact with the elastic piece. According to the invention, the magnet is mounted in the third mounting hole, and suction force can be provided for the mushroom head through the magnet, so that the perpendicularity of the axis is ensured, the friction between the axis and the inner wall of the bearing is reduced, the efficiency of the cooling fan is improved, the friction loss of the cooling fan is attenuated, and the effect of reducing power consumption is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation fans, and in particular to a design method for reducing power consumption of a heat dissipation fan. Background Art

[0002] The cooling fan is a key component of the cooling system. The lubrication of its bearings during the operation of the cooling fan is crucial to the life and stable operation of the fan. The cooling fan usually uses oil-containing bearings, which are self-lubricating bearings with lubricating oil impregnated in their own pores. They have the characteristics of low cost, vibration absorption, low noise, and no need to add lubricating oil for a long working time. They are particularly suitable for working environments that are difficult to lubricate or do not allow oil to be contaminated.

[0003] For example, the application with the authorization announcement number CN218669908U discloses a cooling fan with a central magnetic ring and an oil-containing bearing, which belongs to the technical field of cooling fans. It includes a fan frame, fan blades, and a motor that drives the fan blades to rotate. The fan frame is provided with a central column, and the fan blades are provided with an axis core that is inserted into the central column at one end and rotatably connected to the central column; the axis core and the central column are sequentially sleeved from top to bottom with an oil-containing bearing, a central magnetic ring and a ring buckle for fixing the axis core, and the inner wall of the central column is radially recessed to form a vertical groove for discharging gas in the central column. The fan of this solution runs smoothly, has a high oil retention, and a long service life.

[0004] In the above-mentioned cooling fan, centrifugal force is generated when the fan blades are running. Since the fan blades of the cooling fan only rely on the mushroom head structure at the lower end of the shaft core as a support point, the center of gravity of the fan blade assembly composed of the fan blades and the shaft core will fall between the shaft core and the oil-containing bearing. When the shaft core rotates, the shaft core is prone to swing, and the friction between the shaft core and the inner wall of the oil-containing bearing is large, which affects the heat dissipation efficiency of the cooling fan and increases the loss of the cooling fan. The cooling fan has high power consumption. Summary of the invention

[0005] The present invention provides a power consumption reduction design method for a cooling fan, which is used to solve the current technical problems that the friction between the shaft core and the inner wall of the oil-containing bearing is relatively large, which affects the cooling efficiency of the cooling fan and increases the loss of the cooling fan, and the power consumption of the cooling fan is relatively high.

[0006] In order to solve the above technical problems, the present invention discloses a method for designing a cooling fan to reduce power consumption, comprising the following steps:

[0007] Step 1: Get an outer frame, set a center column at the center of the outer frame, set a first mounting hole and a second mounting hole from top to bottom on the center column, and open a third mounting hole at the bottom of the second mounting hole;

[0008] Step 2: Install a magnet in the third mounting hole and install a spring on the magnet;

[0009] Step 3: Install the retaining ring, washer, and bearing in the first mounting hole from bottom to top;

[0010] Step 4: Install the wire rack with the circuit board on the outer frame, then install the magnetic strip into the motor housing and press the motor housing into the fan blades;

[0011] Step 5: Install the fan blade with the axis onto the outer frame, with the mushroom head at the lower end of the axis in contact with the spring.

[0012] Preferably, in step 1, the diameter of the first mounting hole is greater than the diameter of the second mounting hole, the diameter of the second mounting hole is equal to the diameter of the third mounting hole, and the second mounting hole and the third mounting hole are designed as an integral part.

[0013] Preferably, in step 2, the magnet is cylindrical, the diameter of the magnet is not greater than the diameter of the third mounting hole, and the diameter of the magnet is not less than the diameter of the spring.

[0014] Preferably, the thickness of the magnet is equal to the depth of the third mounting hole.

[0015] Preferably, the axis includes the first connecting segment, the second connecting segment, the third connecting segment and the mushroom head from top to bottom, the central axes of the first connecting segment, the second connecting segment, the third connecting segment and the mushroom head are on the same straight line, and the first connecting segment, the second connecting segment, the third connecting segment and the mushroom head are integrally formed.

[0016] Preferably, the third connecting section is located at the connection between the first mounting hole and the second mounting hole, the diameter of the third connecting section is smaller than the diameter of the second connecting section, and the diameter of the third connecting section is smaller than the diameter of the upper end of the mushroom head.

[0017] Preferably, in step 5, the magnet size characteristic data is first obtained, and then the axis size is optimized based on the magnet size characteristic data. After the optimization is completed, the first connecting section is assembled to the center of the fan blade, and then the mushroom head is inserted into the bearing with the mushroom head facing downward, and the mushroom head slides downward until the mushroom head contacts the upper surface of the spring.

[0018] Preferably, the magnet size characteristic data includes the magnet diameter and the magnet thickness, and the ratio of the third connecting section diameter to the magnet diameter is 1.8:6.9.

[0019] Preferably, the ratio of the length of the third connecting section to the thickness of the magnet is 1.65:1.65, the ratio of the vertical distance from the lower surface of the second connecting section to the upper surface of the buckle to the thickness of the magnet is 0.3:1.65, and the ratio of the vertical distance from the upper surface of the mushroom head to the lower surface of the buckle to the thickness of the magnet is 1:1.65.

[0020] Preferably, in step 2, a magnet is first selected, and the actual magnetic induction intensity of the magnet is not less than the target magnetic induction intensity, and the target magnetic induction intensity is calculated by the following formula:

[0021]

[0022] Among them, B0 is the target magnetic induction intensity, m1 is the preset weight of the axis, π is the pi, π is 3.14, n is the preset maximum speed of the axis, r1 is the maximum diameter of the upper end of the mushroom head, is the magnetic permeability in vacuum, h1 is the thickness of the shrapnel, A1 is the cross-sectional area of ​​the shrapnel, is the magnetic permeability of the shaft material, μ s is the static friction coefficient between the lower end of the mushroom head and the upper surface of the shrapnel.

[0023] The technical solution of the present invention has the following advantages: The present invention provides a method for designing a cooling fan to reduce power consumption, which relates to the technical field of cooling fans, and includes the following steps: obtaining an outer frame, setting a central column at the center of the outer frame, setting a first mounting hole and a second mounting hole from top to bottom on the central column, and opening a third mounting hole at the bottom of the second mounting hole; installing a magnet in the third mounting hole, and installing a spring on the magnet; installing a buckle ring, a washer, and a bearing in the first mounting hole from bottom to top in sequence; installing a wire rack with a circuit board on the outer frame, sleeved with a magnetic strip on the outside of the wire rack, and covering a motor shell on the outside of the magnetic strip; installing a fan blade with an axis on the outer frame, and the mushroom head at the lower end of the axis contacts the spring. In the present invention, a magnet is installed in the third mounting hole, and the magnet can provide suction for the mushroom head, thereby ensuring the verticality of the axis, and at the same time strengthening the overall suction, reducing the friction between the axis and the inner wall of the bearing, improving the heat dissipation efficiency of the cooling fan, and attenuating the friction loss of the cooling fan, thereby achieving the effect of reducing power consumption.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the devices particularly pointed out in the written description and the drawings of the description.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of the steps of a method for designing power consumption reduction of a heat dissipation fan according to the present invention;

[0028] Figure 2 It is a schematic diagram of the existing cooling fan structure;

[0029] Figure 3 This is an exploded view of the existing cooling fan;

[0030] Figure 4 This is a schematic diagram of the heat dissipation fan structure in the present invention;

[0031] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0032] Figure 6 This is an exploded view of the heat dissipation fan in the present invention.

[0033] In the figure: 1. outer frame; 2. center column; 3. first mounting hole; 4. second mounting hole; 5. third mounting hole; 6. magnet; 7. spring; 8. retaining ring; 9. gasket; 10. bearing; 11. circuit board; 12. wire rack; 13. magnetic strip; 14. motor housing; 15. fan blade; 16. axis; 17. mushroom head; 18. first connecting section; 19. second connecting section; 20. third connecting section. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Embodiment 1:

[0037] The embodiment of the present invention provides a method for designing a cooling fan to reduce power consumption. Figure 1-Figure 6 As shown, the following steps are included:

[0038] Step 1: Obtain an outer frame 1, set a center column 2 at the center of the outer frame 1, set a first mounting hole 3 and a second mounting hole 4 from top to bottom on the center column 2, and open a third mounting hole 5 at the bottom of the second mounting hole 4;

[0039] Step 2: Install the magnet 6 in the third mounting hole 5, and install the spring 7 on the magnet 6;

[0040] Step 3: Install the buckle 8, the washer 9, and the bearing 10 in the first mounting hole 3 from bottom to top;

[0041] Step 4: Install the wire rack 12 with the circuit board 11 on the outer frame 1, then install the magnetic strip 13 into the motor housing 14, and press the motor housing 14 into the fan blade 15;

[0042] Step 5: Install the fan blade 15 with the shaft 16 onto the outer frame 1, and the mushroom head 17 at the lower end of the shaft 16 contacts the spring 7;

[0043] In step 1, the diameter of the first mounting hole 3 is greater than the diameter of the second mounting hole 4, the diameter of the second mounting hole 4 is equal to the diameter of the third mounting hole 5, and the second mounting hole 4 and the third mounting hole 5 are designed to be integrally formed;

[0044] In step 2, the magnet 6 is cylindrical, the diameter of the magnet 6 is not greater than the diameter of the third mounting hole 5, and the diameter of the magnet 6 is not less than the diameter of the spring 7;

[0045] The thickness of the magnet 6 is equal to the depth of the third mounting hole 5 .

[0046] The working principle and beneficial effects of the above technical solution are as follows: Figure 2 , Figure 3As shown, the existing cooling fan includes an outer frame 1, a central column 2 is arranged at the center of the outer frame 1, a first mounting hole 3 and a second mounting hole 4 are arranged in sequence from top to bottom in the central column 2, a spring piece 7 is arranged at the bottom of the second mounting hole 4, a buckle ring 8, a washer 9, and a bearing 10 are arranged in sequence from bottom to top at the bottom of the first mounting hole 3, a wire rack 12 is sleeved on the outside of the central column 2, a circuit board 11 is arranged at the bottom of the wire rack 12, a magnetic strip 13 is sleeved on the outside of the wire rack 12, a motor housing 14 is installed on the outside of the magnetic strip 13, a fan blade 15 is arranged on the outside of the motor housing 14, a shaft 16 is arranged at the center of the fan blade 15, and a shaft The core 16 is connected with the fan blade 15 to form a fan blade 15 assembly. The lower end of the shaft core 16 passes through the through hole in the center of the bearing 10 and contacts the upper surface of the spring 7. The center point of the magnetic strip 13 of the existing cooling fan is biased upward, and the center point of the metal part of the wire frame 12 is biased downward, thereby forming a magnetic pressure difference. Since the wire frame 12 is a fastener and the magnetic strip 13 is a movable part, the wire frame 12 causes the entire fan blade 15 assembly to be subjected to a downward suction force, thereby adsorbing the fan blade 15. The existing cooling fan uses the suction between the magnetic strip 13 and the wire frame 12 to ensure the normal operation of the fan, but Yes, centrifugal force is generated when the cooling fan is running. Since the fan blade 15 is supported by the mushroom head 17 at the lower end of the shaft 16, but the mushroom head 17 is not subjected to magnetic attraction, the center of gravity of the fan blade 15 assembly still falls between the shaft 16 and the bearing 10. When the shaft 16 rotates, it is easy to rub against the inner wall of the bearing 10. The friction between the shaft 16 and the bearing 10 is large, which affects the heat dissipation efficiency of the cooling fan and increases the loss of the cooling fan. The power consumption of the cooling fan increases. In order to solve the above problems, the present application designs a cooling fan that can reduce power consumption. The design method includes the following steps: first obtain an outer frame 1, set a center column 2 at the center of the outer frame 1, set a first mounting hole 3 and a second mounting hole 4 from top to bottom on the center column 2, and open a third mounting hole 5 at the bottom of the second mounting hole 4; install a magnet 6 in the third mounting hole 5, and install a spring 7 on the magnet 6; install a buckle 8, a washer 9, and a bearing 10 in the first mounting hole 3 from bottom to top; install a wire rack 12 with a circuit board 11 on the outer frame 1, and then install the magnetic strip 13 into the motor housing 14, and press the motor housing 14 into the fan blade 15;The fan blade 15 with the shaft 16 is installed on the outer frame 1, and the mushroom head 17 at the lower end of the shaft 16 contacts the spring 7. Among them, the outer frame 1, the spring 7, the buckle 8, the gasket 9, the bearing 10, the wire rack 12, the circuit board 11, the magnetic strip 13, the motor housing 14, the shaft 16, and the fan blade 15 can all use the components of the existing cooling fan. It is only necessary to process a third mounting hole 5 at the bottom of the second mounting hole 4, and then install the magnet 6 to the third mounting hole 5. By arranging the magnet 6 below the shaft 16, the magnet 6 can attract the shaft 16 through strong magnetism, thereby ensuring the verticality of the shaft 16, thereby The verticality of the fan blade 15 assembly as a whole is improved. In addition to the suction between the magnetic strip 13 and the wire frame 12, the suction between the magnet 6 and the axis 16 strengthens the overall suction. When the cooling fan is installed sideways, the present application can improve the surface contact friction between the axis 16 of the existing cooling fan and the inner wall of the bearing 10 to the point contact friction between the axis 16 and the spring 7, thereby reducing the friction force on the axis 16, improving the performance of the cooling fan, attenuating the friction loss of the cooling fan itself, improving the heat dissipation efficiency, reducing the power consumption of the cooling fan and extending the service life of the cooling fan. ;

[0047] Example 2

[0048] On the basis of the above-mentioned embodiment 1, Figure 4-Figure 6 As shown, the axis 16 includes a first connecting segment 18, a second connecting segment 19, a third connecting segment 20 and a mushroom head 17 from top to bottom, and the central axes of the first connecting segment 18, the second connecting segment 19, the third connecting segment 20 and the mushroom head 17 are on the same straight line, and the first connecting segment 18, the second connecting segment 19, the third connecting segment 20 and the mushroom head 17 are integrally formed;

[0049] The third connecting section 20 is located at the connection between the first mounting hole 3 and the second mounting hole 4. The diameter of the third connecting section 20 is smaller than the diameter of the second connecting section 19. The diameter of the third connecting section 20 is smaller than the diameter of the upper end of the mushroom head 17.

[0050] In step 5, the size characteristic data of the magnet 6 is first obtained, and then the size of the axis 16 is optimized based on the size characteristic data of the magnet 6. After the optimization is completed, the first connecting section 18 is assembled to the center of the fan blade 15, and then the mushroom head 17 is inserted downward into the bearing 10, and the mushroom head 17 slides downward until the mushroom head 17 contacts the upper surface of the spring 7;

[0051] The dimensional characteristic data of the magnet 6 include the diameter of the magnet 6 and the thickness of the magnet 6 , and the ratio of the diameter of the third connecting section 20 to the diameter of the magnet 6 is 1.8:6.9;

[0052] The ratio of the length of the third connecting section 20 to the thickness of the magnet 6 is 1.65:1.65, the ratio of the vertical distance from the lower surface of the second connecting section 19 to the upper surface of the buckle 8 to the thickness of the magnet 6 is 0.3:1.65, and the ratio of the vertical distance from the upper surface of the mushroom head 17 to the lower surface of the buckle 8 to the thickness of the magnet 6 is 1:1.65.

[0053] The working principle and beneficial effects of the above technical solution are as follows: in step 5, the size of the axis 16 can be optimized by obtaining the size characteristic data of the magnet 6. Specifically, the ratio of the diameter a of the third connecting segment 20 to the diameter b of the magnet 6 is 1.8:6.9; the ratio of the length c of the third connecting segment 20 to the thickness d of the magnet 6 is 1.65:1.65, the ratio of the vertical distance e from the lower surface of the second connecting segment 19 to the upper surface of the buckle 8 to the thickness d of the magnet 6 is 0.3:1.65, and the ratio of the vertical distance f from the upper surface of the mushroom head 17 to the lower surface of the buckle 8 to the thickness d of the magnet 6 is 1:1.65. By optimizing the size of the axis 16, the friction of the axis 16 can be further reduced, thereby improving efficiency and reducing power consumption.

[0054] Example 3

[0055] On the basis of Embodiment 1 or 2, in step 2, a magnet 6 is first selected, and the actual magnetic induction intensity of the magnet 6 is not less than the target magnetic induction intensity, and the target magnetic induction intensity is calculated by the following formula:

[0056]

[0057] Wherein, B0 is the target magnetic induction intensity, m1 is the preset weight of the shaft 16, π is the pi, π is 3.14, n is the preset maximum speed of the shaft 16, r1 is the maximum diameter of the upper end of the mushroom head 17, is the magnetic permeability in vacuum, h1 is the thickness of the spring 7, A1 is the cross-sectional area of ​​the spring 7, is the magnetic permeability of the material of the shaft 16, μ s is the static friction coefficient between the lower end of the mushroom head 17 and the upper surface of the spring 7.

[0058] The working principle and beneficial effects of the above technical solution are as follows: in step 2, based on the parameters of the existing cooling fan components, the target magnetic induction intensity of the magnet 6 can be accurately calculated by the above formula, and then the actual magnetic induction intensity of the magnet 6 to be selected is measured by a magnetic field strength measuring instrument. When the actual magnetic induction intensity of the magnet 6 is not less than the target magnetic induction intensity, the magnet 6 is selected. The magnet 6 can attract the axis 16 through strong magnetism, thereby ensuring the verticality of the axis 16, thereby improving the verticality of the fan blade 15 assembly as a whole, and can improve the surface contact friction between the axis 16 and the inner wall of the bearing 10 to the point contact friction between the axis 16 and the spring 7, thereby reducing the friction force on the axis 16, improving the performance of the cooling fan, attenuating the friction loss of the cooling fan itself, improving the heat dissipation efficiency, reducing the power consumption of the cooling fan and extending the service life of the cooling fan.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for reducing power consumption of a cooling fan, characterized in that: The following steps are involved: Step 1: Obtain an outer frame (1), set a center column (2) at the center of the outer frame (1), set a first mounting hole (3) and a second mounting hole (4) on the center column (2) from top to bottom, and open a third mounting hole (5) at the bottom of the second mounting hole (4); Step 2: Install a magnet (6) in the third installation hole (5), and install a spring (7) on the magnet (6); Step 3: Install the retaining ring (8), the washer (9), and the bearing (10) in the first mounting hole (3) from bottom to top; Step 4: Install the wire rack (12) with the circuit board (11) on the outer frame (1), then install the magnetic strip (13) into the motor housing (14), and press the motor housing (14) into the fan blade (15); Step 5: Install the fan blade (15) with the shaft (16) onto the outer frame (1), and the mushroom head (17) at the lower end of the shaft (16) contacts the spring (7).

2. The method for designing a cooling fan to reduce power consumption according to claim 1, characterized in that: In step 1, the diameter of the first mounting hole (3) is greater than the diameter of the second mounting hole (4), the diameter of the second mounting hole (4) is equal to the diameter of the third mounting hole (5), and the second mounting hole (4) and the third mounting hole (5) are designed as an integral molding.

3. The method for designing a cooling fan to reduce power consumption according to claim 1, characterized in that: In step 2, the magnet (6) is cylindrical, the diameter of the magnet (6) is not greater than the diameter of the third mounting hole (5), and the diameter of the magnet (6) is not less than the diameter of the spring (7).

4. The method for designing a cooling fan to reduce power consumption according to claim 3, characterized in that: The thickness of the magnet (6) is equal to the depth of the third mounting hole (5).

5. The method for designing a cooling fan to reduce power consumption according to claim 1, characterized in that: The axis (16) includes, from top to bottom, a first connecting section (18), a second connecting section (19), a third connecting section (20) and a mushroom head (17); the central axes of the first connecting section (18), the second connecting section (19), the third connecting section (20) and the mushroom head (17) are on the same straight line; the first connecting section (18), the second connecting section (19), the third connecting section (20) and the mushroom head (17) are designed to be integrally formed.

6. The method for designing a cooling fan to reduce power consumption according to claim 5, characterized in that: The third connecting section (20) is located at the connection between the first mounting hole (3) and the second mounting hole (4), the diameter of the third connecting section (20) is smaller than the diameter of the second connecting section (19), and the diameter of the third connecting section (20) is smaller than the diameter of the upper end of the mushroom head (17).

7. The method for designing a cooling fan to reduce power consumption according to claim 6, characterized in that: In step 5, the size characteristic data of the magnet (6) is first obtained, and then the size of the axis (16) is optimized based on the size characteristic data of the magnet (6). After the optimization is completed, the first connecting section (18) is assembled to the center of the fan blade (15), and then the mushroom head (17) is inserted downward into the bearing (10), and the mushroom head (17) slides downward until the mushroom head (17) contacts the upper surface of the spring (7).

8. The method for designing a cooling fan to reduce power consumption according to claim 7, characterized in that: The dimensional characteristic data of the magnet (6) include the diameter of the magnet (6) and the thickness of the magnet (6), and the ratio of the diameter of the third connecting section (20) to the diameter of the magnet (6) is 1.8:6.

9.

9. The method for designing a cooling fan to reduce power consumption according to claim 8, characterized in that: The ratio of the length of the third connecting section (20) to the thickness of the magnet (6) is 1.65:1.65, the ratio of the vertical distance from the lower surface of the second connecting section (19) to the upper surface of the buckle (8) to the thickness of the magnet (6) is 0.3:1.65, and the ratio of the vertical distance from the upper surface of the mushroom head (17) to the lower surface of the buckle (8) to the thickness of the magnet (6) is 1:1.

65.

10. The method for designing a cooling fan to reduce power consumption according to claim 1, characterized in that: In step 2, a magnet (6) is first selected, and the actual magnetic induction intensity of the magnet (6) is not less than the target magnetic induction intensity. The target magnetic induction intensity is calculated by the following formula: Wherein, B0 is the target magnetic induction intensity, m1 is the preset weight of the shaft (16), π is the circumference of a circle, π is 3.14, n is the preset maximum rotation speed of the shaft (16), r1 is the maximum diameter of the upper end of the mushroom head (17), is the magnetic permeability in vacuum, h1 is the thickness of the spring (7), A1 is the cross-sectional area of ​​the spring (7), is the magnetic permeability of the material of the shaft (16), μ s is the static friction coefficient between the lower end of the mushroom head (17) and the upper surface of the spring sheet (7).

Images