CN101008405B - cooling fan - Google Patents

Abstract

A heat dissipation fan comprises a housing, a fan wheel and a circuit board. The housing has an air flow passage and a base. The base is arranged on one side of the airflow channel for bearing the circuit board. The impeller is rotatably coupled to the base and has a hub and a plurality of blades. The circuit board is provided with at least one heat-generating electronic element. In the axial direction of the shell, the heating electronic element protrudes out of the range of the fan wheel hub, and at least part of the heating electronic element is positioned at the downwind position of the blade, so that the heat energy generated by the heating electronic element is dissipated. The heat dissipation efficiency of the heating electronic element can be improved, the service life of the heat dissipation fan can be prolonged, and the turbulence and the noise of the heat dissipation fan can be reduced.

Description

cooling fan

technical field

The invention relates to a cooling fan, in particular to a cooling fan which arranges at least one heating electronic component at the downwind of the blades of the fan wheel, so as to improve the cooling efficiency of the heating electronic component and prolong the service life.

Background technique

Please refer to FIG. 1 , a conventional cooling fan includes a casing 1 , a fan wheel 2 and a circuit board 3 . The casing 1 is provided with an air passage 10 , an air inlet 11 , an air outlet 12 , a base 13 and a stator assembly 14 . The airflow channel 10 is used for accommodating the fan wheel 2 and allowing airflow to be input from the air inlet 11 and output from the air outlet 12 . The base 13 is disposed on the side of the air outlet 12 for carrying the circuit board 3 and the stator assembly 14 and combined with the fan wheel 2 . The fan wheel 2 is provided with a hub 21 , a shaft 22 , several blades 23 and a ring magnet 24 . The hub 21 is in an inverted bowl shape. The shaft 22 is located at the inner center of the hub 21 so as to be coupled to the base 13 with a dynamic fit. Each blade 23 is disposed on the outer peripheral surface of the hub 21 . The circuit board 3 is provided with an induction element 31 and at least one heating electronic element 32 for controlling the alternating excitation of the stator set 14 . During operation, the ring magnet 24 is used to induce the alternating excitation of the stator assembly 14 to drive the fan wheel 2 to rotate, and then the blades 23 drive airflow from the air inlet 11 side to the air outlet 12 side.

Generally speaking, the above-mentioned conventional cooling fan has the following disadvantages, for example: during the operation of the cooling fan, the heat-generating electronic components 32 of the circuit board 3 are transistors, for example, which use semi-conductive metal/non-metal mixed materials to control the current. thyristor direction. Therefore, during the operation of the heat-generating electronic component 32 , the material of the heat-generating electronic component 32 must consume some electric energy and convert it into heat energy. However, structurally, the heating electronic component 32 is located inside the base 13 and the hub 21 , and the heating electronic component 32 usually lacks a proper heat dissipation mechanism. If the heat energy of the heating electronic component 32 cannot be dissipated in time, the high temperature will reduce the operation stability of the heating electronic component 32 and even affect the service life of the cooling fan. Based on the above reasons, it is necessary to further improve the above-mentioned conventional cooling fan.

In view of this, the present invention improves the above-mentioned shortcoming by protruding a circuit board from a base to the leeward of the blades of the fan wheel, so that the airflow guided by each blade can simultaneously affect at least one heating electronic component on the circuit board. To dissipate heat. Therefore, the present invention can indeed relatively improve the heat dissipation efficiency of the heat-generating electronic components, and then relatively prolong the service life of the heat-dissipating fan.

Contents of the invention

The main purpose of the present invention is to provide a heat dissipation fan that protrudes at least one heat-generating electronic component of the circuit board from the base to the downwind of a blade of a fan wheel for heat dissipation, which can improve the heat-dissipating efficiency of the heat-generating electronic component and prolong the service life. .

The secondary purpose of the present invention is to provide a heat dissipation fan that protrudes at least one heat-generating electronic component of the circuit board from a base to the downwind of a blade of a fan wheel, and corresponds to a rib plate, which can reduce turbulent flow and noise.

Technical scheme of the present invention:

A cooling fan, which includes: a shell, which is provided with an air inlet, an air flow channel, an air outlet and a base, the air inlet and the air outlet are respectively located on two sides of the air flow channel, the base is located on On one side of the airflow passage, the base is provided with a gap; a fan wheel is rotatably combined with the base, and is provided with a hub and several blades; and a circuit board, which is carried on the base, And at least one heating electronic component and at least one extension are provided, the heating electronic component protrudes outside the range of the hub of the fan wheel in the axial direction of the housing, and is at least partially located at the leeward of the blade, so as to dissipate For heat energy generated by the heating electronic component, the extension protrudes radially outward from the circuit board to the hub of the fan wheel, the heating electronic component is arranged on the extension, and the extension and the heating electronic component protrude from the gap.

The advantages of the present invention are:

1. Since the extension of the circuit board protrudes radially outwards, at least the part of the heating electronic components on it protrudes to the downwind of each blade, so the heat dissipation efficiency of the heating electronic components can be improved and the use of the cooling fan can be extended life.

2. Since at least one heating electronic component on the circuit board protrudes to the downwind of each blade and corresponds to a rib with a notch, the turbulence and noise of the cooling fan can be reduced.

Description of drawings

Figure 1 is a cross-sectional view of a conventional cooling fan.

Fig. 2 is a three-dimensional exploded view of the first embodiment of the present invention.

Fig. 3 is a top view of the first embodiment of the present invention.

Fig. 4 is a sectional view of 4-4 of the first embodiment of the present invention.

Fig. 5 is a top view of the second embodiment of the present invention.

Fig. 6 is a top view of the third embodiment of the present invention.

Fig. 7 is a sectional view of the third embodiment of the present invention.

Detailed ways

In order to make the above-mentioned purpose, technical features and advantages of the present invention more obvious and understandable, the preferred embodiments of the present invention are specifically cited below, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to FIG. 2 , the first embodiment of the present invention is a cooling fan, which mainly includes a casing 1 , a fan wheel 2 and a circuit board 3 . The circuit board 3 maintains a specific relative assembly relationship with the casing 1 and the fan wheel 2 so as to relatively prolong the service life of the circuit of the circuit board 3 .

Please refer to FIGS. 2 and 3 , the casing 1 is provided with an airflow passage 10 , an air inlet 11 , an air outlet 12 , a base 13 and a stator assembly 14 . The airflow channel 10 is used for accommodating the fan wheel 2 . The air inlet 11 and the air outlet 12 are located on two sides of the airflow channel 10 respectively, and can be used to input airflow and output airflow respectively. The base 13 can be located on the side of the air outlet 12 or the air inlet 11 , and has several ribs 130 , a shaft tube 131 , at least one bearing 132 and at least one notch 133 . Each rib 130 is connected between the base 13 and the inner wall surface of the air flow channel 10 of the housing 1, and at least one rib 130 has a wire groove a and a wire gap b for accommodating the power cord of the circuit board 3 (Fig. not shown). The shaft tube 131 is integrally formed or assembled at the center of the base 13 for accommodating the bearing 132 . The notch 133 corresponds to the rib 130 , especially to the rib 130 having the wire slot a. The stator assembly 14 is fixed on the base 13 together with the circuit board 3 for generating alternating excitation.

The fan wheel 2 is provided with a hub 21 , a shaft 22 , several blades 23 and a ring magnet 24 . The hub 21 is in an inverted bowl shape. The shaft 22 is disposed at the center of the hub 21 so as to be inserted into the bearing 132 of the base 13 with a dynamic fit. Each blade 23 is arranged on the outer peripheral surface of the hub 21, and it is better to use axial flow blades. The ring magnet 24 is arranged on the inner wall of the hub 21 to induce the alternating excitation generated by the stator group 14 to drive the fan wheel 2 to rotate, and then the blades 23 drive the airflow from the side of the air inlet 11 to the 12 sides of the air outlet.

The circuit board 3 is a rigid printed circuit board in the shape of a fan-shaped sheet or a rectangular sheet. The circuit board 3 is provided with at least one extending portion 30 , at least one inductive element 31 and at least one heating electronic element 32 . The circuit board 3 is fixed on the base 13 , preferably near the notch 133 of the rib 130 . The extension portion 30 radially protrudes outward from the circuit board 3 , and protrudes onto the rib 130 outside the notch 133 . The inductive element 31 is arranged in one side of the circuit board 3 and corresponds to the bottom end surface of the ring magnet 24 of the fan wheel 2 along the axial direction of the casing, so the inductive element 31 can detect the polarity of the ring magnet 24 Variety. The heating electronic component 32 is disposed on one side of the extension portion 30 of the circuit board 3 , and is preferably disposed on the side of the extension portion 30 close to the fan wheel 2 . The heating electronic element 32 is used for processing the signal detected by the inductive element 31 so as to further output an alternating current to the stator set 14 . The heating electronic element 32 is preferably a transistor or an integrated circuit package (IC), such as a field-effect transistor (field-effect transistor, FET) or a metal-oxide semiconductor (metal-oxide semiconductor, MOS).

Please refer to Figures 3 and 4, when the cooling fan is assembled, the hub 21 of the fan wheel 2 corresponds to the base 13 of the housing 1 in the axial direction, and the sensing element 31 of the circuit board 3 moves along the housing. The axial direction corresponds to the bottom end surface of the ring magnet 24 of the fan wheel 2 . Furthermore, the extension portion 30 of the circuit board 3 protrudes radially outward from the notch 133 to the outside of the hub 21 , and can be selected to protrude only partly or completely to the outside of the hub 21 according to requirements. Furthermore, the extension portion 30 preferably corresponds to the rib plate 130 having the wire groove a and the wire notch b. At this time, at least part or all of the heating electronic components 32 on the extension portion 30 are located at the leeward of each blade 23 .

When the cooling fan is running, the heating electronic element 32 of the circuit board 3 generates an alternating current to the stator set 14 according to the detection signal of the induction element 31, so that the stator set 14 generates an alternating magnetic field to drive the fan wheel 2 turn. The blades 23 of the fan wheel 2 immediately drive the air flow from the air inlet 11 to the air outlet 12 . Since the heating electronic component 32 is at least partially located at the downwind of each blade 23 , the airflow driven by each blade 23 can dissipate the heat energy generated by the heating electronic component 32 . Therefore, the temperature rise of the heating electronic component 32 can be effectively avoided, and the stability and rated output power of the heating electronic component 32 can be avoided from being affected, thereby relatively prolonging the service life of the cooling fan. Furthermore, when the heating electronic component 32 of the extension part 30 is located on the rib plate 130 with the wire groove a, it will help to relatively reduce the turbulence and noise generated by the heating electronic component 32 in contact with the airflow, thereby increasing the The use quality of the cooling fan.

Please refer to Fig. 5, the structure of the second embodiment of the present invention is basically the same as that of the first embodiment, the difference is that the circuit board 3 of the second embodiment is circular, and the circuit board 3 expands the extension according to product requirements. The protruding area of the part 30 makes the extension part 30 protrude to the adjacent position of the rib plate 130, so as to further arrange more heat-generating electronic components 32 on the extension part 30, and at least partially position it on each blade. 23 downwind for effective heat dissipation. Furthermore, the circuit board 3 is provided with a coupling hole 33 at the center, so as to be sleeved on the shaft tube 131 of the base 13 . Therefore, the second embodiment not only further increases the heat dissipation efficiency of the heat-generating electronic component 32 , but also relatively improves the assembly reliability of the circuit board 3 .

Please refer to Figures 6 and 7, the structure of the third embodiment of the present invention is basically the same as that of the first embodiment, the difference is that the circuit board 3' of the third embodiment is a flexible printed circuit board, and the circuit board 3 'has at least one extension 30', an inductive element 31' and at least one heating electronic element 32', on the other hand, the circuit board 3' can also be a combination of rigid and flexible printed circuit boards, such as the circuit board The main body of 3' is a rigid printed circuit board, while its extension 30' is a flexible printed circuit board, and vice versa. Since the thickness of the flexible printed circuit board is relatively smaller than that of the rigid printed circuit board, the thickness space saved by using the flexible printed circuit board for the extension part 30' can be used for arranging a larger-sized heating electronic component 32'. In addition, at least one balance sheet 15 can also be arranged on the circuit board 3', and the balance sheet 15 can be used to prevent the circuit board 3' from warping. The balancing piece 15 is made of magnetically permeable material (such as iron or iron alloy), and corresponds to the ring magnet 24 . When the fan wheel 2 rotates, a magnetic attraction balance force can be formed between the balance piece 15 and the ring magnet 24 . Therefore, the third embodiment not only increases the heat dissipation efficiency and assembly margin of the heat-generating electronic component 32 , but also relatively improves the rotation balance of the fan wheel 2 .

As mentioned above, in view of the disadvantages of the heat-generating electronic components 32 of the conventional heat dissipation fan located within the scope of the base 13 and the hub 21, and usually lacking a proper heat dissipation mechanism, it is easy to be overheated and burned, etc., the present invention separates the circuit board 3 from the base 13 The blades 23 protrude radially outward to the leeward of the fan wheel 2 , so that the airflow guided by each blade 23 can be used to dissipate heat from the heat-generating electronic components 32 on the circuit board 3 at the same time. Therefore, the present invention can indeed reduce the temperature rise of the heat-generating electronic component 32 , thereby relatively prolonging the service life of the heat-dissipating fan.

Claims (10)

1. radiation fan, it comprises:

One housing, it is provided with a wind inlet, an air-flow path, an exhaust outlet and a pedestal, and this wind inlet and exhaust outlet lay respectively at two sides of this air-flow path, and this pedestal is located at a side of this air-flow path, and this pedestal is provided with a breach;

One impeller, rotating being combined on this pedestal, and be provided with a wheel hub and several blades; And

One circuit board, it is carried on this pedestal, and be provided with at least one heat-generating electronic elements and at least one extension part, this heat-generating electronic elements this housing axially on protrude out to outside the scope of this impeller wheel hub, and be positioned at the leeward of this blade to small part, in order to dispersing the heat energy that this heat-generating electronic elements produces, this extension part is protruded out to outside the impeller wheel hub by this circuit board radially outward, this extension part is provided with this heat-generating electronic elements, and this extension part and heat-generating electronic elements are convexly set in this breach.

2. radiation fan according to claim 1 is characterized in that: described circuit board is rigid printed circuit board or flexible printed wiring board.

3. radiation fan according to claim 1 is characterized in that: described heat-generating electronic elements is located at the side of this extension part near this impeller.

4. radiation fan according to claim 1, it is characterized in that: described pedestal is provided with several floors, each floor is connected between this pedestal and the air-flow path internal face, has a floor at least corresponding to this breach, and this extension part and heat-generating electronic elements are protruded out on this floor.

5. radiation fan according to claim 4 is characterized in that: described pedestal has a floor with a metallic channel and a lead breach at least, and for the power line of this circuit board of guiding, and the breach of this pedestal is corresponding to the floor of this tool metallic channel.

6. radiation fan according to claim 1 is characterized in that: described pedestal is provided with a central siphon and at least one bearing, and this central siphon is located at this pedestal central authorities, and each bearing is placed in this central siphon, combines with this impeller.

7. radiation fan according to claim 1 is characterized in that: described circuit board central authorities are provided with a joining hole that is placed on this pedestal central siphon.

8. radiation fan according to claim 1 is characterized in that: described circuit board is provided with a sense cell at least, establishes a ring magnet in the wheel hub of this impeller in addition, and this sense cell is corresponding to an end of this ring magnet.

9. radiation fan according to claim 1 is characterized in that: described heat-generating electronic elements is transistor or intergrated circuit potted element.

10. radiation fan according to claim 9 is characterized in that: described heat-generating electronic elements is field-effect transistor or metal-oxide semiconductor (MOS).

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