TW201400713A - Impeller - Google Patents

Abstract

An impeller of a cooling fan is disclosed. The impeller comprises a metal base, a shaft and a plurality of plastic vanes. The metal base has a shaft-coupling portion and an engaging portion distinct to the shaft-coupling portion. A plate portion is formed between the shaft-coupling portion and the engaging portion. The plate portion has a first plane and a second plane opposing the first plane. A permanent magnet is mounted on the first plane. The shaft has a fixed end coupled with the shaft-coupling portion of the metal base. Each vane has a coupling portion coupled with the engaging portion of the metal base. In such an arrangement, the impeller may be applied to electronic products with miniature design.

Description

Fan of cooling fan

The invention relates to a fan wheel of a heat dissipation fan, in particular to a fan wheel of a heat dissipation fan suitable for a thin design.

Today's electronic products are generally designed and developed in the direction of miniaturization. The cooling fans installed in various electronic products to provide a predetermined heat dissipation must also be designed to be lighter, thinner and shorter. Miniaturized electronic devices or electronic instruments.

Please refer to the first and second figures of the Republic of China, No. I293106, "Thin Fan" invention patent, which discloses a conventional cooling fan 8, which comprises a base 81, a fan wheel 82, A piece of magnet 83 and a shaft 84. The base 81 is provided with a shaft hole 811 and a coil set 812; the fan wheel 82 has a plurality of bent blades 821; the sheet magnet 83 is coupled to the bottom of the fan wheel 82; one end of the shaft 84 is rotatably The shaft hole 811 is coupled to the base 81, and the other end is coupled to the fan wheel 82. Thereby, the fan wheel 82 of the conventional cooling fan 8 is designed to be thinned for installation in various miniaturized electronic products.

The fan wheel 82 of the above-mentioned conventional heat dissipating fan 8 is generally formed by stamping a metal plate having a fan wheel shape, and then being bent on the outer periphery of the metal plate to form a plurality of blades of a predetermined angle. However, although the conventional fan wheel 82 can be miniaturized by using a metal plate, the conventional fan wheel 82 is formed in a complicated manner and must use too much metal material, so that the conventional fan is relatively easy to be used. Increase in manufacturing cost of wheel 82 Moreover, the shape of the plurality of blades formed by bending the metal sheet is not easily changed too much. Moreover, since the overall structure of the fan wheel 82 is made of a metal material, when the fan wheel 82 rotates, the load is relatively increased, which easily affects the overall operating efficiency. In addition, the angles of the blades formed by bending the outer circumference of the conventional fan wheel 82 are not completely consistent, and the wind blowing effect and the rotational balance of the conventional fan wheel 82 are more easily affected.

Moreover, as shown in Fig. 3, it is a new patent case of the "Miniature Fan Rotor" of the Republic of China No. M350746, which discloses another relatively thin design of a thinned fan wheel. The patent discloses a fan rotor 9 having a metal housing 91. The metal housing 91 is centrally coupled to a shaft 92, and a peripheral wall of the metal housing 91 integrally forms a metal blade bracket. 93. The metal blade bracket 93 is combined with a plastic blade portion 94. The main structure of the fan rotor 9 is a metal casing 91 and a metal blade bracket 93, so that a better structural strength can be maintained. The structure of the fan rotor 9 for driving the wind is a plastic blade portion 94 integrally formed of a plastic material. Therefore, the fan rotor 9 has the advantages of easy molding, effective reduction in manufacturing cost, and good wind driving effect, and the fan rotor 9 is provided. It is possible to achieve a thinner shape with better structural strength.

However, between the center of the metal casing 91 of the fan rotor 9 (ie, the portion for pivoting the shaft center 92) and the outer periphery of the metal blade bracket 93 (ie, the portion for bonding the plastic blade portion 94), It is not a complete planar structure, that is, a portion of the metal casing 91 that is in contact with the metal blade bracket 93 is a bulging hub portion 95, resulting in an increase in the overall axial height of the metal casing 91. When the fan rotor 9 is applied to various miniaturized electronic products, the hub portion 95 of the metal casing 91 easily causes an axial height. The increase, and thus occupying too much space inside the miniaturized electronic products, makes it difficult for electronic products to develop and design in the direction of miniaturization, so there is still a need for improvement.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a fan wheel for a heat dissipating fan having a metal substrate capable of effectively reducing the overall axial height for supply to various interiors of miniaturized electronic products for its primary object.

A second object of the present invention is to provide a fan wheel for a heat dissipating fan, which is constructed by combining a metal substrate with a plastic blade to form a fan wheel structure, thereby having both advantages of thinning and better structural strength.

The fan wheel of the cooling fan of the present invention mainly comprises a metal substrate, a central shaft and a plurality of plastic blades. The metal substrate has a shaft connecting portion and a joint portion away from the shaft connecting portion, and a bent flat plate portion is formed between the shaft connecting portion and the joint portion, and the bent flat plate portion has an opposite first plane And a second plane, the first plane is provided with a permanent magnet; the central shaft is provided with a fixing end, the fixing end is coupled to the shaft connecting portion of the metal substrate; the plurality of plastic blades have a coupling portion, the coupling The joint is combined with the joint of the metal substrate.

The coupling portion of the plurality of plastic blades is an annular covering portion, and the annular covering portion is coupled to the joint portion of the metal substrate.

The joint portion of the metal substrate may be provided with a plurality of perforations, and the plurality of plastic blades integrally combine the plurality of perforations, and the coupling portions of the plurality of plastic blades integrally join the plurality of perforations. Wherein the plurality of perforations of the joint portion of the metal substrate are preferably disposed in an annular arrangement adjacent to the outer periphery of the metal substrate Position, the plurality of perforations have a spacing from each other.

The joint portion of the metal substrate may be provided with a zigzag outer periphery on the outer periphery of the metal substrate, and the coupling portions of the plurality of plastic blades integrally cover the zigzag outer periphery of the joint portion of the metal substrate.

The joint portion of the metal substrate may be formed with a bent portion formed by bending from the outer periphery of the metal substrate, and the coupling portion of the plurality of plastic blades integrally wraps the joint portion of the metal substrate segment. Preferably, the coupling portion of the plurality of plastic blades simultaneously covers the upper surface and the lower surface of the bending portion of the plurality of plastic blades; or the bending portion may further be provided with a through hole, the plurality of plastic blades The coupling portion covers the through hole of the bending section.

The joint portion of the metal substrate may be provided with a continuous bending section, and the coupling portions of the plurality of plastic blades integrally cover the continuous bending section of the joint portion of the metal substrate. Preferably, the coupling portion of the plurality of plastic blades simultaneously covers the upper surface and the lower surface of the continuous bending portion of the plurality of plastic blades; or the continuous bending portion of the joint portion of the metal substrate is preferably from the metal The outer periphery of the substrate extends axially and then extends radially outward; or alternatively, at least one of the axially extending portion and the radially extending portion of the continuous bending portion is further provided with a through hole, the plurality of plastic blades The coupling portion covers the through hole of the continuous bending section.

The joint portion of the non-bent flat portion of the metal substrate and the metal substrate may be coplanar.

The joint portion of the non-bending flat portion of the metal substrate and the metal substrate may be non-coplanar. Wherein the unbent flat portion of the metal substrate has a first axial height in an axial direction of the axial portion of the metal substrate, the joint portion of the metal substrate has a second axial height, the second axial height And the The ratio of the first axial height may be 1.1 to 8.5, preferably 1.1 to 4.

The first plane and the second plane of the metal substrate may be bare. Alternatively, the first plane or the second plane of the metal substrate may also be coated with a plastic film or a rustproof film.

The fixed end of the central shaft is flat or not protruded from the second plane of the metal substrate.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to Figures 4, 5 and 6, the fan wheel of the heat dissipation fan of the present invention comprises a metal substrate 1, a central axis 2 and a plurality of plastic blades 3; the central axis 2 is coupled to the central portion of the metal substrate 1, The plurality of plastic blades 3 are bonded to the periphery of the metal substrate 1.

The metal substrate 1 is provided with a shaft joint portion 11 and a joint portion 12 remote from the shaft joint portion 11. The shaft joint portion 11 is a structural design that can be used for fixing the center shaft 2. In the embodiment, the shaft joint portion 11 is a fixing hole for fixing the center shaft 2; the joint portion 12 is used for For the combination of the plurality of plastic blades 3, the joint portion 12 can be combined with the integrally formed plastic blade 3, and is in various different embodiments (see the following for details).

The metal substrate 1 forms a non-bending flat portion 13 (not including the shaft portion 11 and the joint portion 12) between the shaft portion 11 and the joint portion 12, thereby making the flat portion without bending 13 has a first plane opposite 131 and a second plane 132, wherein the first plane 131 is provided with a permanent magnet 14.

Moreover, the first plane 131 and the second plane 132 of the non-bent flat portion 13 of the metal substrate 1 may be bare, or may be covered with a non-bending flat portion 13 such as a plastic film or a rustproof film. A metal plate 1 is preferably a plate body made of a magnetically permeable material. When used to bond the permanent magnets 14, the metal substrate 1 can be used as a magnetic sealing plate.

The center shaft 2 is provided with a fixing end 21 which is coupled to the shaft joint portion 11 of the metal substrate 1 and the fixing end 21 of the center shaft 2 and the shaft joint portion 11 of the metal substrate 1 are fixed. The bonding method can be, for example, injection molding, snapping, locking, welding, tight fitting, bonding, and the like. The embodiment shown in FIG. 5 discloses that the fixing end 21 of the center shaft 2 is welded, tightly fitted or adhered to the shaft joint portion 11 of the metal substrate 1; the embodiment shown in FIG. 7 reveals The fixing end 21 of the center shaft 2 is fastened to the shaft joint portion 11 of the metal substrate 1 by a buckle; the embodiment shown in FIG. 8 discloses that the fixing end 21 of the center shaft 2 is formed by using an injection molding package. Covering the shaft joint portion 11 of the metal substrate 1. Moreover, the fixed end 21 of the central shaft 2 is preferably flattened or not protruded from the second plane 132 of the metal substrate 1 as shown in FIG. 5 to further reduce the axial height of the metal substrate 1. The fan wheel of the heat dissipation fan of the invention is more suitable for use in miniaturized electronic products.

The plurality of plastic blades 3 have a coupling portion 31 and a wind portion 32. The coupling portion 31 is coupled to the joint portion 12 of the metal substrate 1. The coupling portion 31 of the plurality of plastic blades 3 can be formed by injection molding. In combination with the structural design of the joint portion 12 of the metal substrate 1, the coupling portion 31 may be a plurality of cladding segments as shown in FIGS. 5 and 6 (described later in detail) or a ring shape as shown in FIGS. 9 to 13 The covering portion (described in detail later) is used to improve the manufacturing and assembly convenience, and it is easier to ensure that the plurality of plastic blades 3 form a predetermined predetermined angle, and the plastic blade 3 can also make more shape changes. In order to enhance the driving effect and have better rotational balance.

The embodiment of the coupling portion 12 of the metal substrate 1 of the present invention and the coupling portion 31 of the plastic blade 3 can be roughly divided into the following embodiments:

Referring to FIGS. 5 and 6, the first embodiment is disclosed. The bonding portion 12 of the metal substrate 1 is provided with a plurality of through holes 121, and the plurality of through holes 121 are disposed adjacent to the metal substrate in an annular arrangement. a portion of the outer peripheral edge, and the plurality of perforations 121 have a spacing therebetween; and the plurality of plastic blades 3 are integrally formed by injection molding to form the perforations 121 of the joint portion 12 of the metal substrate 31, and the plurality of plastic blades 3 The coupling portion 31 is a plurality of cladding segments 311 for each of the plastic blades 3 to cover the plurality of through holes 121. Furthermore, the coupling portion 31 of the present embodiment may also be an annular covering portion designed to integrally cover the plurality of through holes 121 of the joint portion 12 of the metal substrate 1 by the annular covering portion; The plurality of plastic blades 3 are tightly coupled to the metal substrate 1, and the plurality of plastic blades 3 are effectively prevented from being loosened or even peeled off.

Referring to FIG. 9 , a second embodiment is disclosed, wherein the joint portion 12 of the metal substrate 1 is provided with a zigzag outer peripheral edge 122 on the outer periphery of the metal substrate 1; and, the plurality of plastic blades 3 An annular covering portion 312 is connected to one end, and the coupling portion 31 of the plurality of plastic blades 3 is the annular covering portion 312, and the annular covering portion 312 is formed by injection molding. The sawtooth outer peripheral edge 122 of the joint portion 12 of the metal substrate 1 is integrally covered; thereby, the plurality of plastic blades 3 can be effectively prevented from being loosened or even peeled off; In the embodiment of FIGS. 5 and 6, the plastic blade 3 of the present embodiment can be designed by using the annular covering portion 312 such that the plurality of plastic blades 3 are more closely coupled to the metal substrate 1.

Referring to FIG. 10, a third embodiment is disclosed, wherein the joint portion 12 of the metal substrate 1 is provided with a bent portion 123 formed by bending from the outer periphery of the metal substrate 1, wherein The bending section 123 may extend obliquely from the outer periphery of the metal substrate 1 to various angles (such as tilting upward or downward, etc.); and one end of the plurality of plastic blades 3 is connected to an annular covering portion 313. The coupling portion 31 of the plurality of plastic blades 3 is the annular covering portion 313, and the annular covering portion 313 integrally covers the bending portion 123 of the joint portion 12 of the metal substrate 1 by injection molding. Preferably, the annular covering portion 313 simultaneously covers the upper surface and the lower surface of the bending portion 123 (mainly in the drawing direction); or the bending portion 123 may be provided with a through hole (not drawn) The annular covering portion 313 can simultaneously cover the through holes of the bending portion 123, thereby providing a more stable bonding effect; thereby, the same can effectively prevent the radial deformation of the plurality of plastic blades 3 Loose or even falling off; further, compared to the embodiment as shown in Figures 5, 6 and 9, due to the bending of this embodiment The 123 series is coated on the annular covering portion 313 of the plastic blade 3, so that the bending portion 123 can be completely replaced by the annular covering portion 313 without increasing the axial height of the metal substrate 1. Covering the inside, thereby effectively increasing the bonding area between the plastic blade 3 and the metal substrate 1, so that the plurality of plastic blades 3 can be more compact than the embodiments as shown in Figures 5, 6 and 9. Combine the metal Substrate 1.

Referring to FIG. 11, a fourth embodiment is disclosed, wherein the joint portion 12 of the metal substrate 1 is provided with a continuous bending section 124, preferably from the outer periphery of the metal substrate 1. After extending axially, the outer side of the plurality of plastic blades 3 is also connected to an annular covering portion 314. The coupling portion 31 of the plurality of plastic blades 3 is the annular package. In the covering portion 314, the annular covering portion 314 integrally covers the continuous bending portion 124 of the joint portion 12 of the metal substrate 1 by injection molding, and the annular covering portion 314 preferably covers the continuous portion at the same time. The upper surface and the lower surface of the bending section 124 (mainly in the drawing direction); or at least one of the axially extending portion and the radially extending portion of the continuous bending section 124 may be provided with a through hole. The annular covering portion 314 can simultaneously cover the through holes of the continuous bending section 124 to provide a more stable bonding effect; for example, as shown in FIG. 12, the continuous bending section 124 is disclosed. The axial extending portion is provided with a through hole 125 for covering the annular covering portion 314, as shown in FIG. The axially extending portion and the radially extending portion of the continuous bending portion 124 are provided with through holes 125 for covering the annular covering portion 314; thereby, the diameters of the plurality of plastic blades 3 can be effectively prevented. In the case of loosening or even falling off; in addition, compared to the embodiment as shown in Figures 5, 6 and 9, since the continuous bending section 124 of the present embodiment is wrapped around the ring of the plastic blade 3 The covering portion 314 can be completely covered by the annular covering portion 314 even under the premise that the axial height of the metal substrate 1 is not increased, thereby effectively increasing the plastic blade 3 Bonding the metal substrates 1 to each other to bond the plurality of plastic blades 3 more closely to the metal substrate 1; Compared with the embodiment of FIG. 10, the bonding area between the plastic blade 3 and the metal substrate 1 can be further effectively improved to greatly enhance the plurality of plastic blades 3 and the metal substrate. The stability between the 1 is stable.

Further, based on the respective embodiments of the fifth, sixth, ninth, tenth and eleventh drawings, the fan wheel of the heat dissipating fan of the present invention can be roughly divided into two types of embodiments. The first and second embodiments shown in FIGS. 5, 6 and 9 wherein the non-bent flat portion 13 of the metal substrate 1 and the joint portion 12 of the metal substrate 1 are coplanar, more specifically, In the axial direction of the shaft portion 11 of the metal substrate 1, the unbent flat portion 13 of the metal substrate 1 has a first axial height H1, and the joint portion 12 of the metal substrate 1 has a second axial height H2. The ratio of the second axial height H2 to the first axial height H1 is 1; and the third and fourth embodiments shown in FIGS. 10 and 11 , wherein the metal substrate 1 has no bent flat portion 13 The joint portion 12 with the metal substrate 1 is non-coplanar, whereby, as described above, it is possible to provide better bond stability, and more specifically, in the axial direction of the shaft joint portion 11 of the metal substrate 1, The non-bending flat portion 13 of the metal substrate 1 also has a first axial height H1, and the joint portion 12 of the metal substrate 1 also has a second axial height H2 based on not exceeding the overall axial height of the plastic blade 3. For the judgment principle, the ratio of the second axial height H2 to the first axial height H1 may be 1.1 to 8.5, preferably 1.1 to 4, to reach To enhance the bonding stability between the plurality of plastic blades 3 and the metal substrate 1.

The fan wheel of the cooling fan of the present invention can be applied to, for example, an axial flow type cooling fan, a blower type cooling fan or a horizontal convection fan. Taking a blower type cooling fan as an example, the fan wheel of the present invention is rotatably mounted on Inside a frame (not shown), a motor (not shown) is used to drive the fan wheel to rotate (the detailed structure and operation mode of the motor-driven fan wheel of the cooling fan are provided in the technical field of the cooling fan) It is generally understood by those skilled in the art that the heat dissipating fan can be installed in various miniaturized electronic products to provide better heat dissipation for the heat source generated by various miniaturized electronic products.

The metal substrate 1 of the fan wheel of the heat dissipation fan of the present invention is mainly characterized in that the shaft portion 11 of the metal substrate 1 and the joint portion 12 (including the coupling portion 31 of the plurality of plastic blades 3) can form the The flat plate portion 13 is bent; thereby, the first joint portion 131 and the second flat surface 132 are formed between the axial joint portion 11 and the joint portion 12 of the metal substrate 1 , wherein the first plane 131 and the second plane 132 does not have any structure similar to the ridge of the hub, so that the axial height of the metal substrate 1 can be effectively reduced. Therefore, the fan wheel of the cooling fan of the present invention can be more suitably installed inside various miniaturized electronic products without occupying the Minimize the space inside the electronic products to facilitate the development of various electronic products in the direction of miniaturization.

Furthermore, the fan wheel of the heat dissipation fan of the present invention is mainly composed of the metal substrate 1 and a plurality of plastic blades 3. The metal substrate 1 can adopt a thin plate structure, so that the fan wheel of the present invention can still use the metal substrate 1 to retain better structural strength while being thinned; and the wind-driven structure portion of the fan wheel of the present invention uses plastic. The plastic blade 3 made of the material can also effectively reduce the manufacturing cost, and the fan wheel of the present invention has the advantages of both thinning and structural strength.

The design of the non-bending flat plate portion 13 of the metal substrate 1 of the fan wheel of the heat dissipation fan of the present invention, the fan wheel having the metal substrate 1 capable of being effectively reduced The overall axial height of the fan wheel of the cooling fan of the present invention has an effect suitable for use in a thinned electronic product.

The fan wheel of the heat dissipation fan of the present invention can utilize the composition of the metal substrate 1 and the plurality of plastic blades 3, so that the fan wheel of the heat dissipation fan of the invention has both thinning and good structural strength.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

〔this invention〕

1‧‧‧Metal substrate

11‧‧‧Axis joint

12‧‧‧Combination Department

121‧‧‧Perforation

122‧‧‧Sawtooth outer circumference

123‧‧‧Bend section

124‧‧‧Continuous bending section

125‧‧‧through hole

13‧‧‧No bending flat part

131‧‧‧ first plane

132‧‧‧ second plane

14‧‧‧ permanent magnet

2‧‧‧ center axis

21‧‧‧Fixed end

3‧‧‧Plastic blades

31‧‧‧ coupling

311‧‧‧covered section

312‧‧‧Ring Cover

313‧‧‧Circular covering

314‧‧‧Ring Cover

32‧‧‧The Ministry of Wind

H1‧‧‧First axial height

H2‧‧‧second axial height

[study]

8‧‧‧ cooling fan

81‧‧‧Base

811‧‧‧Axis hole

812‧‧‧ coil set

82‧‧‧fan wheel

821‧‧‧Bent fan blades

83‧‧‧Slice magnet

84‧‧‧ shaft

9‧‧‧Fan rotor

91‧‧‧Metal housing

92‧‧‧Axis

93‧‧‧Metal leaf bracket

94‧‧‧Plastic fan blade

95‧‧‧ Hub

Figure 1: An exploded perspective view of a conventional thin fan.

Figure 2: A cross-sectional view of a conventional thin fan.

Figure 3: A cross-sectional view of a conventional thinned fan.

Fig. 4 is a perspective view showing the fan wheel of the heat dissipation fan according to the first embodiment of the present invention.

Fig. 5 is a sectional view showing the combination of the fan wheel of the heat radiating fan of the first embodiment of the present invention.

Fig. 6 is a top plan view showing a fan wheel of a heat dissipation fan according to a first embodiment of the present invention.

Fig. 7 is a partial schematic view showing the fixing of the metal substrate and the central axis of the fan wheel of the cooling fan of the present invention (1).

Figure 8: Metal substrate and central axis of the fan wheel of the cooling fan of the present invention A partial schematic diagram of each other (2).

Fig. 9 is a top plan view showing a fan wheel of a heat dissipation fan according to a second embodiment of the present invention.

Fig. 10 is a sectional view showing the combination of a fan wheel of a heat radiating fan according to a third embodiment of the present invention.

Figure 11 is a sectional view showing the combination of the fan wheel of the heat radiating fan of the fourth embodiment of the present invention.

Fig. 12 is a sectional view showing a combination of a through-hole of a continuous bending section of a fan wheel of a cooling fan according to a fourth embodiment of the present invention (1).

Fig. 13 is a sectional view showing a combination of a through-hole of a continuous bending section of a fan wheel of a cooling fan according to a fourth embodiment of the present invention (2).

1‧‧‧Metal substrate

11‧‧‧Axis joint

12‧‧‧Combination Department

121‧‧‧Perforation

13‧‧‧No bending flat part

131‧‧‧ first plane

132‧‧‧ second plane

14‧‧‧ permanent magnet

2‧‧‧ center axis

21‧‧‧Fixed end

3‧‧‧Plastic blades

311‧‧‧covered section

31‧‧‧ coupling

32‧‧‧The Ministry of Wind

Claims (23)

A fan of a heat dissipating fan, comprising: a metal substrate having a shaft connecting portion and a joint portion away from the shaft connecting portion, wherein the shaft connecting portion and the joint portion form a flat portion without bending The non-bending flat portion has an opposite first plane and a second plane, the first plane is provided with a permanent magnet; a central shaft, the central shaft is provided with a fixing end, and the fixing end is coupled with the metal substrate And a plurality of plastic blades, wherein the plurality of plastic blades have a coupling portion, and the coupling portion is coupled to the joint portion of the metal substrate. The fan wheel of the heat dissipating fan according to the first aspect of the invention, wherein the coupling portion of the plurality of plastic blades is an annular covering portion, and the annular covering portion is coupled to the joint portion of the metal substrate. The fan wheel of the heat dissipating fan of claim 1 or 2, wherein the joint portion of the metal substrate is provided with a plurality of perforations, and the coupling portions of the plurality of plastic blades integrally join the plurality of perforations. The fan wheel of the heat dissipating fan of claim 3, wherein the plurality of perforations of the joint portion of the metal substrate are disposed in an annular arrangement at a portion adjacent to an outer circumference of the metal substrate, the plurality of perforations being between each other With spacing. The fan wheel of the heat dissipating fan of claim 1 or 2, wherein the joint portion of the metal substrate is provided with a zigzag outer periphery on the outer periphery of the metal substrate, and the coupling portion of the plurality of plastic blades is integrally provided. A serrated outer periphery of the joint portion of the metal substrate is covered. The fan wheel of the heat dissipating fan of claim 1 or 2, wherein the joint portion of the metal substrate is provided with a bent portion formed by bending from a periphery of the metal substrate, the plurality of plastics The coupling portion of the blade integrally covers the bent portion of the joint portion of the metal substrate. The fan wheel of the heat dissipation fan of claim 6, wherein the coupling portion of the plurality of plastic blades simultaneously covers the upper surface and the lower surface of the bending segments of the plurality of plastic blades. The fan wheel of the heat dissipation fan of claim 6, wherein the bending section is provided with a through hole, and the coupling portion of the plurality of plastic blades covers the through hole of the bending section. The fan wheel of the heat dissipating fan of claim 1 or 2, wherein the joint portion of the metal substrate is provided with a continuous bending section, and the coupling portion of the plurality of plastic blades integrally covers the joint portion of the metal substrate Continuous bending section. The fan wheel of the heat dissipation fan of claim 9, wherein the coupling portion of the plurality of plastic blades simultaneously covers the upper surface and the lower surface of the continuous bending section of the plurality of plastic blades. The fan wheel of the heat dissipating fan of claim 9, wherein the continuous bending section of the joint portion of the metal substrate extends axially from the outer periphery of the metal substrate and then extends radially outward. The fan wheel of the heat dissipation fan of claim 9, wherein at least one of the axially extending portion and the radially extending portion of the continuous bending portion is provided with a through hole, and the coupling of the plurality of plastic blades The portion covers the through hole of the continuous bending section. A fan wheel of a cooling fan according to claim 3, wherein The joint portion of the non-bent flat portion of the metal substrate and the metal substrate is coplanar. The fan wheel of the heat dissipation fan of claim 5, wherein the joint portion of the non-bent flat portion of the metal substrate and the metal substrate is coplanar. The fan wheel of the heat dissipating fan according to claim 6, wherein the joint portion of the non-bending flat portion of the metal substrate and the metal substrate is non-coplanar. The fan wheel of the heat dissipation fan of claim 15, wherein the unbent flat portion of the metal substrate has a first axial height in an axial direction of the axial portion of the metal substrate, and the metal substrate The joint has a second axial height, and the ratio of the second axial height to the first axial height is 1.1 to 8.5. The fan wheel of the heat dissipation fan of claim 16, wherein the ratio of the second axial height to the first axial height is 1.1 to 4. The fan wheel of the heat dissipating fan according to claim 9, wherein the joint portion of the non-bending flat portion of the metal substrate and the metal substrate is non-coplanar. The fan wheel of the heat dissipation fan of claim 18, wherein the unbent flat portion of the metal substrate has a first axial height in an axial direction of the axial portion of the metal substrate, and the metal substrate The joint has a second axial height, and the ratio of the second axial height to the first axial height is 1.1 to 8.5. The fan wheel of the heat dissipation fan according to claim 19, wherein the ratio of the second axial height to the first axial height is 1.1 to 4. The fan wheel of the heat dissipation fan of claim 1 or 2, wherein the first plane and the second plane of the metal substrate are bare. The fan wheel of the heat dissipation fan according to claim 1 or 2, wherein the first plane or the second plane of the metal substrate is covered with a plastic film or a rustproof film. The fan wheel of the heat dissipation fan of claim 1 or 2, wherein the fixed end of the central shaft is flat or not protruded from the second plane of the metal substrate.