Fan blade opening and closing impeller and heat dissipation fan with same

Abstract

This invention provides an impeller with openable and closable blades and a cooling fan incorporating the same. The cooling fan includes a fan frame and an impeller. The impeller is rotatably mounted on the fan frame and includes a hub, a plurality of fan blades, and a first magnetic element and a plurality of second magnetic elements that can magnetically attract each other. The hub has an inner peripheral wall and an outer peripheral wall with a plurality of connecting parts. The fan blades have connected rod seats and shafts rotatably connected to the connecting parts. The rod seats have mounting parts. The first magnetic elements are located on the inner peripheral wall, and each of the second magnetic elements is located in its respective mounting part. Each fan blade can be magnetically attracted to the first magnetic element through the second magnetic element across the hub and thus folded together. Each fan blade can also be unfolded by the hub rotating. This achieves a dual effect of being both cool and fun, while ensuring that each fan blade can reliably fold together.

Description

Technical Field

[0001] This invention relates to cooling fans, and more particularly to impellers with openable and closable blades and cooling fans having such impellers. Background Technology

[0002] The cooling fan mainly includes a fan frame and an impeller rotatably mounted within the fan frame. The impeller has a hub and a plurality of blades connected to the periphery of the hub. When the impeller is driven to rotate relative to the fan frame, the airflow generated by the rotation of each blade can carry away the heat generated by the electronic heating element, thereby achieving a heat dissipation effect.

[0003] However, the impellers of existing cooling fans are all integrally molded into the hub, which means that the existing impellers only have the simple and fixed function of being driven to rotate, which is too monotonous and boring, and therefore needs to be improved.

[0004] Therefore, how to improve the deficiencies of the prior art is a major issue that the inventors of this application urgently need to solve. Summary of the Invention

[0005] (a) Technical problems to be solved The purpose of this invention is to provide an impeller with openable and closable blades and a cooling fan incorporating the impeller, allowing the blades to unfold during rotation and retract after rotation stops. To achieve the above objective, this invention adopts the following technical solution: (II) Technical Solution To achieve the above objectives, this application provides an impeller with openable and closable blades, comprising: a hub having a surrounding wall, the surrounding wall having an inner peripheral wall and an outer peripheral wall facing each other, the surrounding wall having a plurality of connecting portions on the outer peripheral wall; a plurality of blades, each blade having a rod seat and a shaft connected to each other, each blade being rotatably connected to each of the connecting portions by the shaft, each rod seat having a mounting portion; a first magnetic element disposed on the inner peripheral wall; and a plurality of second magnetic elements disposed on each of the mounting portions, the first magnetic element and the second magnetic elements being magnetically attracted to each other; wherein each blade can be folded relative to the hub by magnetic attraction between the second magnetic element and the first magnetic element across the surrounding wall, and each blade can also be unfolded relative to the hub by the hub starting to rotate.

[0006] This application also provides a cooling fan with an impeller whose blades can be opened and closed, comprising: a fan frame having a bushing member; and an impeller with openable and closable blades as described above, rotatably disposed on the bushing member; wherein the impeller with openable and closable blades can rotate relative to the fan frame.

[0007] (III) Beneficial Effects Compared with the prior art, this application has the following advantages: each fan blade has the dual function of being driven to rotate and swinging relative to the hub, thus creating a cool and interesting effect, and each fan blade can even be retracted. Attached Figure Description

[0008] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0009] Figure 1 A three-dimensional schematic diagram of the cooling fan assembly in this application.

[0010] Figure 2 This is a three-dimensional exploded view of the cooling fan in this application.

[0011] Figure 3 This is a partial three-dimensional schematic diagram of the cooling fan of this application when viewed from below.

[0012] Figure 4 This is a cross-sectional view of the cooling fan in this application.

[0013] Figure 5 This is a top view of the cooling fan of this application with the fan blades extended.

[0014] Figure 6 This is a top view of the cooling fan of this application after the fan blades are retracted.

[0015] Explanation of icon numbers: Detailed Implementation

[0016] The detailed description and technical content of this application are illustrated below with reference to the accompanying drawings. However, the accompanying drawings are for reference and illustration only and are not intended to limit this application.

[0017] This application provides an impeller with openable and closable blades and a cooling fan having therein, such as Figure 1 and Figure 2 As shown, the cooling fan (hereinafter referred to as "cooling fan") of this application with an openable and closable impeller includes: a fan frame 100 and an impeller (hereinafter referred to as "impeller") 300 with openable and closable blades. It should be noted that the stator and rotor assembly are omitted in the figures of this application.

[0018] A support frame 1 is installed inside the fan frame 100, and the support frame 1 is as follows: Figure 2 A bushing component 2 is shown.

[0019] like Figures 1 to 4As shown, the impeller 300 is rotatably mounted on the bushing component 2 and includes: a hub 3, a plurality of fan blades 4, a first magnetic element M1, and a plurality of second magnetic elements M2, enabling the impeller 300 to rotate relative to the fan frame 100. The aforementioned stator and rotor assembly, which is omitted from the figure, is disposed between the hub 3 and the bushing component 2. A circuit board, also omitted from the figure, is electrically connected to the stator and rotor assembly.

[0020] The hub 3 has a cover plate (not indicated) and a surrounding wall 31 connected to the outer edge of the cover plate. The surrounding wall 31 has an inner peripheral wall 31a and an outer peripheral wall 31b that are opposite to each other. The hub 3 has a plurality of connecting parts 32 arranged at intervals around the outer peripheral wall 31b. Each fan blade 4 is rotatably connected to each connecting part 32.

[0021] It should be noted that the structure of the connecting part 32 and the structure of the part of the fan blade 4 that is rotatably connected to the connecting part 32 are not limited in this application, as long as the fan blade 4 can rotate relative to the connecting part 32 after connection. For example, as shown in the figure, the fan blade 4 can have a protruding shaft 45, and the connecting part 32 can be provided with a corresponding shaft hole 322 for rotatably connecting the shaft 45; of course, in other embodiments not shown in the figure, the connecting part 32 can also be formed into a rod-shaped structure, and the fan blade 4 can be provided with a corresponding hole-shaped structure, so that the rod-shaped structure can be rotatably connected to the hole-shaped structure. This application does not limit this, and this embodiment will use the former as an example for explanation, which will be described in detail below.

[0022] The connecting part 32 can be of various feasible structures, as long as it can be rotatably connected to the shaft 45. This application does not limit this. In this embodiment, a lug protruding from the outer peripheral wall 31b is used as an example for explanation. The shaft hole 322 is opened through the lug.

[0023] The fan blade 4 is specifically provided with a rod seat 46 and the aforementioned shaft 45 connected to each other. The rod seat 46 protrudes from one wing surface of the fan blade 4 and has an end face 461 that is bent from each other and a plurality of seat sidewalls 462. Each seat sidewall 462 surrounds and is connected to the outer edge of the seat end face 461. The aforementioned shaft 45 is vertically connected to the seat end face 461, so that the rod seat 46 is located between the shaft 45 and the wing surface of the fan blade 4. In this way, each fan blade 4 is rotatably connected to each connecting part 32 with its shaft 45 as the axis, so that each fan blade 4 can rotate relative to each connecting part 32. The rod seat 46 also has a groove 4641, and the groove 4641 passes through at least one sidewall 462 to form a notch 4642, so that the groove 4641 can communicate with the outside through the notch 4642. The groove 4641 can be defined as a mounting part 464 (specifically, the groove 4641 and at least one notch 4642 are together defined as the mounting part 464), in other words, the rod seat 46 has a mounting part 464.

[0024] In addition, such as Figure 2 , Figure 5 and Figure 6 As shown, the fan blade 4 has a root portion 41, and a shaft 45 and a rod seat 46 together extend linearly from the root portion 41 onto the aforementioned airfoil surface of the fan blade 4 (e.g., the inner airfoil surface of the inner and outer airfoil surfaces). The shaft 45 includes a necked-down rod 452, and preferably also includes an inverted body 453. The two ends of the necked-down rod 452 are bridged between the inverted body 453 and the seat end face 461 of the rod seat 46, and the outer diameter of the necked-down rod 452 is smaller than the maximum outer diameter of the inverted body 453.

[0025] When assembling the fan blade 4 onto the wheel hub 3, as follows Figures 2 to 4 As shown, the shaft 45 is inserted through the corresponding connecting part 32, extending from one side of the connecting part 32 to the other side. This allows the necking rod 452 to be inserted into the shaft hole 322, and also causes the buckle 453 to protrude and buckle against the other side of the connecting part 32. In this way, each fan blade 4 can rotate relative to the connecting part 32 with the necking rod 452 as the axis.

[0026] The first magnetic element M1 is disposed on the aforementioned inner peripheral wall 31a, such that the first magnetic element M1, which may be in a ring shape, is located inside the hub 3. The first magnetic element M1 may be a magnet (e.g., a permanent magnet or electromagnet) or a magnetically attracted metal (e.g., an iron ring). This application does not limit this, as long as the first magnetic element M1 can magnetically attract the second magnetic element M2 to each other.

[0027] Each second magnetic element M2 is disposed in each mounting portion 464 (or groove 4641), and each second magnetic element M2 is exposed to the outer peripheral wall 31b through each notch 4642. Furthermore, the notches 4642 of each rod seat 46 are adjacent to (or close to) the outer peripheral wall 31b of the hub 3 when the fan blade 4 is in the unfolded state. The second magnetic element M2 can be a magnetically attracted metal (e.g., an iron ring) or a magnet (e.g., a permanent magnet or electromagnet). This application does not limit this, as long as the second magnetic element M2 can magnetically attract the first magnetic element M1.

[0028] In other words, the first magnetic element M1 and the second magnetic element M2 can be a magnet and the magnetically attracted metal, the magnetically attracted metal and the magnet, or both of them can be magnets.

[0029] like Figure 4 and paired Figure 5As shown, when the user turns on the power of the cooling fan or controls the cooling fan to start running, the impeller 300 will rotate relative to the fan frame 100. At this time, one of the blades 4 will be subjected to wind force, so that each blade 4 can rotate relative to each connecting part 32 with the neck extension rod 452 as the axis, thereby causing each blade 4 to unfold relative to the hub 3. It should be noted that since the shaft 45 is set at the root 41, the rotation angle of the blade 4 will be limited because the root 41 abuts against the hub 3, that is, each blade 4 will only swing at an angle relative to the hub 3.

[0030] like Figure 4 and paired Figure 6 As shown, when the user turns off the power of the cooling fan, the impeller 300 will stop rotating (so there is no centrifugal force generated by rotation). At this time, since there is a magnetic attraction between each second magnetic element M2 and the first magnetic element M1 through the enclosure 31, each fan blade 4 will retract relative to the hub 3 due to the magnetic attraction.

[0031] Therefore, since the fan blades 4 of the cooling fan are not integrally formed with the hub 3, but can swing (expand or retract) relative to the hub 3 under different conditions, the fan blades 4 of this application have the dual functions of being driven to rotate and swinging relative to the hub 3, thus having a cool and interesting effect. More specifically, since the fan blades 4 use magnetic attraction to swing relative to the hub 3 to retract, this application also has the effect of reliably retracting the fan blades 4.

[0032] like Figure 2 , Figure 5 and Figure 6 As shown, it should be specifically noted that the root 41 of the fan blade 4 has a first blade angle 411 and a second blade angle 412 spaced apart from each other, and the aforementioned shaft 45 and rod seat 46 are preferably arranged together adjacent to the first blade angle 411.

[0033] Therefore, when each fan blade 4 is in such a state Figure 6 When the fan blades are in the retracted state as shown, the first blade angle 411 of each fan blade 4 will swing to abut against the outer peripheral wall 31b of the hub 3 due to magnetic attraction; when each fan blade 4 is in the retracted state as shown Figure 5 In the unfolded state shown, each fan blade 4 will swing due to the centrifugal force during rotation until the second blade angle 412 abuts against the outer peripheral wall 31b of the hub 3. In other words, the swing angle of the fan blade 4 can be limited by the first blade angle 411 and the second blade angle 412 abutting against the outer peripheral wall 31b.

[0034] It should also be noted that when the cooling fan of this application moves from the retracted state to the extended state, since the centrifugal force of the aforementioned rotation is greater than the aforementioned magnetic attraction, each fan blade 4 can break free from the influence of the magnetic attraction and rotate relative to each connecting part 32.

[0035] In summary, the impeller with openable and closable blades and the cooling fan with them in this application can indeed achieve the expected purpose and effect, and can solve the deficiencies of the prior art. Therefore, this patent application is filed.

[0036] The above description is merely a preferred embodiment of this application and does not limit the scope of this application. All equivalent structural changes made based on the description and drawings of this application are similarly included within the scope of this application.

Claims

1. An impeller with openable and closable blades, characterized in that, include: A hub having a wall having an inner peripheral wall and an outer peripheral wall opposite to each other, the wall having a plurality of joints on the outer peripheral wall; A plurality of fan blades, each of the fan blades being provided with a rod seat and a shaft connected to each other, each of the fan blades being rotatably connected to each of the connecting parts by the shaft, and each of the rod seats having a mounting part; A first magnetic attraction element is disposed on the inner peripheral wall; as well as A plurality of second magnetic elements are disposed on each of the mounting portions, and the first magnetic element and the second magnetic element can magnetically attract each other; Each of the fan blades can be magnetically attracted to the first magnetic element through the second magnetic element across the wall and thus retracted relative to the hub. Each of the fan blades can also be extended relative to the hub as the hub begins to rotate.

2. The impeller with openable and closable blades according to claim 1, characterized in that: One side of the fan blade has a protruding rod seat, the rod seat has an end face that is bent against each other and at least one side wall, the shaft is vertically connected to the end face of the seat, the mounting part forms a notch in the side wall of the seat, and the second magnetic element is exposed to the outer peripheral wall through the notch.

3. The impeller with openable and closable blades according to claim 1, characterized in that: The mounting portion is a groove formed in the rod seat, and the notch communicates with the groove.

4. The impeller with openable and closable blades according to claim 1, characterized in that: The first magnetic element and each of the second magnetic elements are respectively a magnet and a magnetically attracted metal.

5. The impeller with openable and closable blades according to claim 1, characterized in that: The first magnetic element and each of the second magnetic elements are two magnets that can magnetically attract each other.

6. The impeller with openable and closable blades according to claim 1, characterized in that: The fan blade has a root, and the rod seat and the shaft are both located at the root.

7. The impeller with openable and closable blades according to claim 1, characterized in that: The shaft includes a necking rod and a buckle body connected to one end of the necking rod. The connecting part has a shaft hole. The necking rod is inserted into the shaft hole from one side of the connecting part, and the buckle body is buckled onto the other side of the connecting part.

8. The impeller with openable and closable blades according to claim 1, characterized in that: Each of the connecting parts is arranged around the outer peripheral wall at intervals.

9. The impeller with openable and closable blades according to claim 1, characterized in that: The fan blade has a root, and the fan blade has a first blade angle and a second blade angle spaced apart from each other at the root. Each fan blade is provided with a shaft near the first blade angle.

10. The impeller with openable and closable blades according to claim 1, characterized in that: Each of the fan blades can be brought into contact with the outer peripheral wall by the second blade angle due to wind force, and each of the fan blades can also be brought into contact with the outer peripheral wall by the first blade angle when retracted relative to the hub.

11. The impeller with openable and closable blades according to claim 1, characterized in that: Each of the fan blades can start rotating via the hub and use the centrifugal force of rotation to expand relative to the hub, which is greater than the magnetic attraction force.

12. A cooling fan with an impeller having openable and closable blades, characterized in that, include: A frame with a bushing component; as well as An impeller with openable and closable blades as described in any one of claims 1 to 11, rotatably disposed on the bushing member; The impeller with openable and closable fan blades can rotate relative to the fan frame.

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