Power reduction design method for heat dissipation fan

Abstract

The application provides a power consumption reduction design method of a heat dissipation fan, relates to the technical field of heat dissipation fans and comprises the following steps: obtaining an outer frame, arranging a center column at the center of the outer frame, arranging a first mounting hole and a second mounting hole on the center column from top to bottom, and arranging a third mounting hole at the bottom of the second mounting hole; mounting a magnet in the third mounting hole and mounting an elastic sheet on the magnet; mounting a clasp, a gasket and a bearing in the first mounting hole from bottom to top in sequence; mounting a wire frame with a circuit board on the outer frame, then mounting a magnetic strip into a motor shell, and pressing the motor shell into a fan blade; mounting the fan blade with a shaft into the outer frame, and making the mushroom head at the lower end of the shaft contact the elastic sheet. In the application, the magnet is mounted in the third mounting hole, the mushroom head can be provided with suction force by the magnet, the perpendicularity of the shaft is ensured, the friction between the shaft and the inner wall of the bearing is reduced, the efficiency of the heat dissipation fan is improved, the friction loss of the heat dissipation fan is attenuated, and the effect of reducing power consumption is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation fans, in particular to a power consumption reduction design method of a heat dissipation fan. BACKGROUND

[0002] The heat dissipation fan is a key component of a heat dissipation system, and the lubrication of the bearing during the operation of the heat dissipation fan is crucial to the service life and stable operation of the fan. The heat dissipation fan usually adopts an oil-containing bearing. The oil-containing bearing is a bearing that realizes self-lubrication by containing lubricating oil in its own pores. It has the characteristics of low cost, vibration absorption, low noise, and no need to add lubricating oil during a long working time, and is particularly suitable for working environments that are not easy to lubricate or do not allow oil contamination.

[0003] For example, the application with the authorized announcement number CN218669908U discloses a heat dissipation fan with a middle magnetic ring and an oil-containing bearing, which belongs to the technical field of heat dissipation 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 center column, and the fan blades are provided with a shaft core that is inserted into the center column at one end and is rotationally connected to the center column. The shaft core and the center column are sequentially sleeved with an oil-containing bearing, a middle magnetic ring, and a ring buckle from top to bottom for fixing the shaft core. The inner wall of the center column is recessed radially to form a vertical groove for discharging gas in the center column. The fan runs stably, has a high oil retention amount, and has a long service life.

[0004] In the above-mentioned heat dissipation fan, the fan blades generate centrifugal force during operation. Since the fan blades of the heat dissipation fan rely only on the mushroom head structure at the lower end of the shaft core as the support point, the center of gravity of the fan blade assembly composed of the fan blades and the shaft core falls between the shaft core and the oil-containing bearing. When the shaft core rotates, the shaft core is prone to oscillation, 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 heat dissipation fan and increases the loss of the heat dissipation fan, resulting in high power consumption of the heat dissipation fan. SUMMARY

[0005] The present application provides a power consumption reduction design method for a heat dissipation fan to solve the technical problem that 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 heat dissipation fan and increases the loss of the heat dissipation fan, resulting in high power consumption of the heat dissipation fan.

[0006] To solve the above technical problems, the present application discloses a power consumption reduction design method for a heat dissipation fan, which includes the following steps:

[0007] Step 1: Obtain an outer frame, and set a center column in the center of the outer frame. The center column is provided with a first mounting hole and a second mounting hole from top to bottom, and a third mounting hole is formed at the bottom of the second mounting hole.

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

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

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

[0011] Step 5: install the fan blade with the shaft on the outer frame, and the mushroom head at the lower end of the shaft is in contact with the spring sheet.

[0012] Preferably, in step 1, the first mounting hole diameter is larger than the second mounting hole diameter, the second mounting hole diameter is equal to the third mounting hole diameter, and the second mounting hole and the third mounting hole are designed in one piece.

[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 sheet.

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

[0015] Preferably, the shaft includes a first connecting section, a second connecting section, a third connecting section, and a mushroom head from top to bottom, the central axes of the first connecting section, the second connecting section, the third connecting section, and the mushroom head are on the same straight line, and the first connecting section, the second connecting section, the third connecting section, and the mushroom head are designed in one piece.

[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 upper end diameter of the mushroom head.

[0017] Preferably, in step 5, the magnet size characteristic data is obtained first, then the shaft size is optimized based on the magnet size characteristic data, after optimization, the first connecting section is assembled to the center of the fan blade, then the mushroom head is inserted into the bearing downward, and the mushroom head is slid downward until the mushroom head is in contact with the upper surface of the spring sheet.

[0018] Preferably, the magnet size characteristic data includes the diameter of the magnet and the thickness of the magnet, and the ratio of the diameter of the third connecting section to the diameter of the magnet 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 snap ring 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 snap ring to the thickness of the magnet is 1:1.65.

[0020] Preferably, in step 2, the magnet is selected first, 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] Wherein, B0 is the target magnetic induction intensity, m1 is the preset weight of the shaft core, π is the circular constant, π is 3.14, n is the preset maximum rotating speed of the shaft core, r1 is the maximum diameter of the upper end of the mushroom head, μ0 is the magnetic permeability in vacuum, h1 is the thickness of the elastic sheet, A1 is the cross-sectional area of the elastic sheet, μ1 is the magnetic permeability of the shaft core material, μ s is the static friction coefficient between the lower end of the mushroom head and the upper surface of the elastic sheet.

[0023] The technical scheme of the present application has the following advantages: the present application provides a power consumption reduction design method for a heat dissipation fan, relates to the technical field of heat dissipation fans, and comprises the following steps: obtaining an outer frame, arranging a center column at the center of the outer frame, arranging a first mounting hole and a second mounting hole on the center column from top to bottom, and arranging a third mounting hole at the bottom of the second mounting hole; mounting a magnet in the third mounting hole and mounting an elastic sheet on the magnet; mounting a clasp, a washer and a bearing in the first mounting hole from bottom to top in sequence; mounting a wire frame with a circuit board on the outer frame, sleeving a magnetic strip outside the wire frame, and covering a motor shell outside the magnetic strip; mounting a fan blade with a shaft core on the outer frame, and making the mushroom head at the lower end of the shaft core contact with the elastic sheet. In the present application, the magnet is mounted in the third mounting hole, the mushroom head can be provided with suction force by the magnet, the perpendicularity of the shaft core is ensured, the overall suction force is strengthened, the friction between the shaft core and the inner wall of the bearing is reduced, the heat dissipation efficiency of the heat dissipation fan is improved, the friction loss of the heat dissipation fan is attenuated, and the effect of reducing power consumption is achieved.

[0024] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by means of the devices particularly pointed out in the written description and the accompanying drawings.

[0025] The technical scheme of the present application will be further described in detail below with the aid of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate embodiments of the present application and explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0027] Figure 1 It is a step schematic diagram of the power consumption reduction design method for the heat dissipation fan of the present application;

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

[0029] Figure 3 It is an exploded view of the existing heat dissipation fan;

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

[0031] Figure 5 Figure is an enlarged view of A in the present application Figure 4

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

[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 piece; 8, clasp; 9, washer; 10, bearing; 11, circuit board; 12, wire holder; 13, magnetic strip; 14, motor shell; 15, fan blade; 16, shaft; 17, mushroom head; 18, first connecting section; 19, second connecting section; 20, third connecting section. DETAILED DESCRIPTION

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

[0035] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and does not mean to indicate or imply the order or sequence, nor to limit the present application, which is only to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions and technical features of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0036] Example 1:

[0037] The power consumption design method of the heat dissipation fan provided by the embodiments of the present application, as shown in the figure, includes the following steps: Figures 1-6

[0038] Step 1: get the outer frame 1, the center column 2 is arranged in the center of the outer frame 1, the first mounting hole 3 and the second mounting hole 4 are arranged from top to bottom in the center column 2, and the third mounting hole 5 is arranged 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 piece 7 on the magnet 6;

[0040] Step 3: install the clasp 8, the washer 9 and the bearing 10 in the first mounting hole 3 from bottom to top in sequence;​​

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

[0042] Step 5: install the fan blade 15 with the shaft 16 on the outer frame 1, and the mushroom head 17 at the lower end of the shaft 16 is in contact with the elastic sheet 7;

[0043] In step 1, the first mounting hole 3 has a diameter larger than that of the second mounting hole 4, the second mounting hole 4 has a diameter equal to that of the third mounting hole 5, and the second mounting hole 4 and the third mounting hole 5 are designed in one piece;

[0044] In step 2, the magnet 6 is in a cylindrical shape, the diameter of the magnet 6 is not larger than that of the third mounting hole 5, and the diameter of the magnet 6 is not smaller than that of the elastic sheet 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 heat dissipation fan includes an outer frame 1, a center column 2 is arranged at the center of the outer frame 1, a first mounting hole 3 and a second mounting hole 4 are sequentially arranged in the center column 2 from top to bottom, a spring 7 is arranged at the bottom of the second mounting hole 4, a clasp 8, a washer 9 and a bearing 10 are sequentially arranged in the first mounting hole 3 from bottom to top, a wire rack 12 is sleeved outside the center column 2, a circuit board 11 is arranged at the bottom of the wire rack 12, a magnetic strip 13 is sleeved outside the wire rack 12, a motor shell 14 is arranged outside the magnetic strip 13, a fan blade 15 is arranged outside the motor shell 14, a shaft 16 is arranged at the center of the fan blade 15, the shaft 16 and the fan blade 15 are connected to form a fan blade 15 assembly, the lower end of the shaft 16 penetrates through the through hole at 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 heat dissipation fan is upward, and the center point of the metal part of the wire rack 12 is downward, so that a magnetic pressure difference is formed, since the wire rack 12 is a fastener and the magnetic strip 13 is a movable part, the entire fan blade 15 assembly is subjected to a downward suction force, so that the fan blade 15 is adsorbed, the existing heat dissipation fan utilizes the suction force between the magnetic strip 13 and the wire rack 12 to ensure the normal operation of the fan, however, centrifugal force is generated during the operation of the heat dissipation fan, since the mushroom head 17 at the lower end of the shaft 16 is used as a support point for the fan blade 15, but the mushroom head 17 is not subjected to a magnetic suction force, therefore, the center of gravity of the fan blade 15 assembly still falls between the shaft 16 and the bearing 10, the shaft 16 is prone to rubbing against the inner wall of the bearing 10 during rotation, the friction between the shaft 16 and the bearing 10 is large, the heat dissipation efficiency of the heat dissipation fan is affected, meanwhile, the loss of the heat dissipation fan is increased, the power consumption of the heat dissipation fan is increased, in order to solve the above problems, the present application designs a heat dissipation fan capable of reducing power consumption, and the design method comprises the following steps: first, an outer frame 1 is obtained, a center 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 the center column 2 from top to bottom, a third mounting hole 5 is formed at the bottom of the second mounting hole 4; a magnet 6 is installed in the third mounting hole 5, and a spring 7 is installed on the magnet 6; a clasp 8, a washer 9 and a bearing 10 are sequentially installed in the first mounting hole 3 from bottom to top; the wire rack 12 with the circuit board 11 is installed on the outer frame 1, then the magnetic strip 13 is installed in the motor shell 14, and the motor shell 14 is pressed into the fan blade 15;The fan blade 15 with shaft 16 is installed onto the outer frame 1. The mushroom head 17 at the lower end of the shaft 16 contacts the spring 7. The outer frame 1, spring 7, retaining ring 8, washer 9, bearing 10, wire frame 12, circuit board 11, magnetic strip 13, motor housing 14, shaft 16, and fan blade 15 can all use components from existing cooling fans. Only a third mounting hole 5 needs to be machined at the bottom of the second mounting hole 4, and then the magnet 6 is installed into the third mounting hole 5. By placing the magnet 6 below the shaft 16, the magnet 6 can attract the shaft 16 through strong magnetism, ensuring the perpendicularity of the shaft 16. The verticality of the fan blade 15 assembly is improved. In addition to the attraction between the magnetic strip 13 and the wire frame 12, the attraction between the magnet 6 and the shaft 16 is strengthened, enhancing the overall attraction. When the cooling fan is installed sideways, this application improves the surface contact friction between the existing cooling fan shaft 16 and the inner wall of the bearing 10 to point contact friction between the shaft 16 and the spring piece 7. This reduces the frictional force on the shaft 16, improves the cooling fan's performance, reduces its own frictional losses, increases heat dissipation efficiency, reduces power consumption, and extends the cooling fan's lifespan.

[0047] Example 2

[0048] Based on the above embodiment 1, as follows Figures 4-6 As shown, the shaft 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. 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. The first connecting segment 18, the second connecting segment 19, the third connecting segment 20 and the mushroom head 17 are designed as a single piece.

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

[0050] In step 5, first obtain the size feature data of magnet 6, then optimize the size of shaft 16 based on the size feature data of magnet 6. After optimization, assemble the first connecting section 18 to the center of fan blade 15, then insert mushroom head 17 downward into bearing 10, and slide mushroom head 17 downward until mushroom head 17 contacts the upper surface of spring piece 7.

[0051] The dimensional characteristics of magnet 6 include the diameter and thickness of magnet 6, and the ratio of the diameter of the third connecting segment 20 to the diameter of 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 clasp 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 clasp 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 shaft 16 is optimized by obtaining the size feature data of the magnet 6. Specifically, the ratio of the diameter a of the third connecting section 20 to the diameter b of the magnet 6 is 1.8:6.9; the ratio of the length c of the third connecting section 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 section 19 to the upper surface of the clasp 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 clasp 8 to the thickness d of the magnet 6 is 1:1.65. By optimizing the size of the shaft 16, the friction on the shaft 16 can be further reduced, thereby improving efficiency and reducing power consumption.

[0054] Embodiment 3

[0055] Based on Embodiment 1 or 2, in step 2, the 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:

[0056]

[0057] wherein B0 is the target magnetic induction intensity, m1 is the preset weight of the shaft 16, π is the circular constant, π is 3.14, n is the preset maximum rotating 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 elastic sheet 7, and A1 is the cross-sectional area of the elastic sheet 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 elastic sheet 7.

[0058] The working principle and beneficial effects of the technical scheme are as follows: in step 2, based on the parameters of the existing heat dissipation fan component, the target magnetic induction intensity of the magnet 6 can be accurately calculated through the above formula, and then the actual magnetic induction intensity of the magnet 6 to be selected is measured by using 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 shaft center 16 through strong magnetism, so that the perpendicularity of the shaft center 16 is ensured, thereby improving the perpendicularity of the fan blade 15 assembly as a whole, and the surface contact friction between the shaft center 16 and the inner wall of the bearing 10 is improved into point contact friction between the shaft center 16 and the elastic sheet 7, so that the friction force borne by the shaft center 16 is reduced, the performance of the heat dissipation fan is improved, the friction loss of the heat dissipation fan itself is attenuated, the heat dissipation efficiency is improved, the power consumption of the heat dissipation fan is reduced, and the service life of the heat dissipation fan is prolonged.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, they can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] Although the embodiments of the present application have been disclosed as above, they are not limited to the application and implementation listed in the specification and embodiments, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A power-saving design method for a cooling fan, characterized in that, Includes the following steps: Step 1: Obtain the outer frame (1), set the center column (2) in the center of the outer frame (1), set the first mounting hole (3) and the second mounting hole (4) from top to bottom in the center column (2), and open the third mounting hole (5) at the bottom of the second mounting hole (4); Step 2: Install the magnet (6) in the third mounting hole (5) and install the spring piece (7) on the magnet (6); Step 3: Install the retaining ring (8), washer (9), and bearing (10) sequentially from bottom to top in the first mounting hole (3); Step 4: Install the wire frame (12) with 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). The mushroom head (17) at the lower end of the shaft (16) contacts the spring (7). The shaft (16) includes a first connecting section (18), a second connecting section (19), a third connecting section (20), and a mushroom head (17) from top to bottom. 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 integrally molded. 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 upper diameter of the mushroom head (17). In step 5, first obtain the size characteristic data of the magnet (6), then optimize the size of the shaft (16) based on the size characteristic data of the magnet (6). After optimization, assemble the first connecting section (18) to the center of the fan blade (15), and then insert the mushroom head (17) downward into the bearing (10). The mushroom head (17) slides downward until the mushroom head (17) contacts the upper surface of the spring piece (7). The dimensional characteristics of the magnet (6) include the diameter and 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; The ratio of the length of the third connecting segment (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 segment (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. In step 2, a magnet (6) is first selected. The actual magnetic induction intensity of the magnet (6) is not less than the target magnetic induction intensity, which is calculated using the following formula: ； in, The target magnetic flux density, The preset weight of the axis (16), Pi Take 3.14, The preset maximum speed of the shaft (16) The maximum diameter at the top of the mushroom head (17) is the maximum diameter. Permeability in vacuum The thickness of the spring (7) The cross-sectional area of ​​the spring piece (7) is... The permeability of the material of the axis (16) is is the static friction coefficient between the lower end of the mushroom head (17) and the upper surface of the spring piece (7).

2. The power-saving design method for a cooling fan 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 piece.

3. The power-saving design method for a cooling fan 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 piece (7).

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

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