TWI712247B - Reduced thickness of cooling fan - Google Patents

Abstract

The present invention is a heat dissipation fan with a reduced thickness. It includes an outer casing, a stator assembly and a fan cover. The stator assembly includes a silicon steel sheet, a plurality of coils and a set of rings. The outer periphery of the silicon steel sheet is ring-shaped. A plurality of teeth are protrudingly provided for winding the plurality of coils, and the collar is sleeved on the plurality of teeth of the silicon steel sheet. The stator assembly of the present invention can be used for winding efficiency. The high outer winding machine improves the production efficiency, and the thickness of the stator assembly is smaller than the thickness of the existing stator assembly. There is no need to squeeze the multiple coils before assembling the cooling fan, which improves the yield of the cooling fan. Therefore, the present invention improves the existing The disadvantage of the technology is to provide a cooling fan with reduced thickness and simplified structure.

Description

Reduced thickness of cooling fan

The invention relates to a stator assembly, in particular to a cooling fan with reduced thickness and simplified structure.

Please refer to FIG. 6 and FIG. 7, the existing cooling fan 70 includes an outer casing 71, a stator assembly 72 and a fan cover 73, wherein the center of the outer casing 71 is fixed with a spindle 711, the stator assembly 72 Set in the outer shell 71 and surround the spindle 711, the fan blade cover 73 is combined with the outer shell 71 through a rotor 74 set on the spindle 711, and covers the stator assembly 72, when the stator The component 72 is energized to generate a magnetic field, which can drive the fan blade cover 73 to rotate and drive the air flow through the plurality of fan blades 731 of the fan blade cover 73 to achieve the effect of heat dissipation.

Furthermore, as shown in FIGS. 7 and 8, the stator assembly 72 of the existing cooling fan 70 includes a silicon steel sheet 721 and a plurality of coils 722. The silicon steel sheet 721 is shown in FIG. 8 and has a plurality of teeth 727. A plurality of teeth 727 are annularly projected on the inner periphery of the silicon steel sheet 721 and extend radially toward the center of the silicon steel sheet 721. A pocket 728 is formed between two adjacent teeth 727 for the plurality of teeth 727 When the coils 722 are respectively wound on the plurality of teeth 727, they are located in the pockets 728 on both sides of the wound teeth 727.

Since the plurality of teeth 721 are located on the inner periphery of the stator assembly 72, the distance between adjacent teeth 721 is small, that is, the space of each slot 728 is narrow, and an existing inner winding machine must be used when winding. To wind the plurality of coils 722, and the winding efficiency of the inner winding machine (the maximum value is about 1000 RPM) is generally lower than that of the existing outer winding machine (the maximum value is about 3000 RPM). Furthermore, due to the narrow space, As shown in FIG. 9, the plurality of coils 722 must extend along the axial direction (upper and lower sides of FIG. 8), resulting in a large overall thickness T ₀ of the stator assembly 72 of the existing cooling fan 70, resulting in a large volume of the existing cooling fan 70 In order to reduce the space occupied by the stator assembly 72 as much as possible during the assembly process of the existing cooling fan 70, the plurality of coils 722 will be squeezed, causing the upper and lower sides of each coil 722 to be broken. As a result, the effectiveness of the stator assembly 72 for generating a magnetic field is reduced, and the existing heat dissipation fan 70 has the disadvantage of poor yield.

In order to solve the disadvantages of the existing heat dissipation fan stator assembly being large in size, occupying space, and causing poor yield of the existing heat dissipation fan, the present invention provides a heat dissipation fan with a small thickness and a simplified thickness, which is further described as follows.

The present invention is a heat dissipation fan with a reduced thickness, which includes an outer casing, a stator assembly and a fan cover. The stator assembly is arranged in the outer casing, and the fan cover is rotatably combined with the outer casing. Covering the stator assembly, wherein the stator assembly includes: a silicon steel sheet, the silicon steel sheet is a ring-shaped structure, and has a plurality of teeth and a plurality of connecting parts, the plurality of teeth are annularly protruding on the silicon steel The outer periphery of the sheet, and a pocket is formed between two adjacent tooth parts, each connecting part connects two adjacent tooth parts of the silicon steel sheet, and the part of each tooth part close to the connecting part is tapered, so that The outer diameter and inner diameter of the silicon steel sheet have the smallest difference at the connecting part; a plurality of coils, the plurality of coils are respectively wound on the plurality of teeth of the silicon steel sheet, and are located on both sides of the wound teeth And a set of rings, which are sleeved on the plurality of teeth of the silicon steel sheet, and surround the outer side of the plurality of coils; each end of the teeth away from the center of the silicon steel sheet forms a convex An opening is formed between the flanges of two adjacent tooth parts. The width of the opening is smaller than the width of the corresponding slot; the inner periphery of the stator assembly is recessed with a plurality of grooves at intervals to make When the collar is sleeved on the silicon steel sheet, each groove abuts against the flange of one of the teeth, and the protruding part between two adjacent grooves extends into the opening between the corresponding two flanges.

In the aforementioned heat dissipation fan with reduced thickness, the flange of each tooth portion of the stator assembly is in an arc shape.

Furthermore, in the aforementioned heat dissipation fan with reduced thickness, the number of teeth and slots of the silicon steel sheet of the stator assembly is an integer multiple of six.

Preferably, in the aforementioned heat dissipation fan with a reduced thickness, the silicon steel sheet of the stator assembly has twelve teeth and twelve pockets.

In the aforementioned heat dissipation fan with reduced thickness, each coil of the stator assembly is wound on one of the teeth, and is located in the pockets on both sides of the teeth.

With the above technical features, the stator assembly of the heat dissipation fan with the reduced thickness of the present invention can use an outer winding machine with higher winding efficiency when winding, thereby improving production efficiency. Further, because the outer periphery of the silicon steel sheet has a relatively large space Large, after winding the plurality of coils, the overall thickness of the stator assembly is smaller than that of the stator assembly of the existing cooling fan. Therefore, there is no need to squeeze the plurality of coils before assembling the cooling fan to prevent the plurality of coils from being damaged , To further improve the yield of the heat dissipation fan. In summary, the present invention effectively improves the disadvantages of the prior art, thereby providing a heat dissipation fan with a reduced thickness and a simplified structure.

10: Silicon steel sheet

11: Teeth

111: flange

12: container

13: opening

14: Connection part

20: coil

30: collar

31: Groove

40: outer shell

401: Mandrel

50: fan blade cover

501: Rotor

51: fan blade

70: cooling fan

71: outer shell

711: Mandrel

72: stator assembly

721: silicon steel sheet

722: Coil

727: tooth

728: container

73: fan blade cover

731: fan blade

74: Rotor

T, T ₀ : thickness

Figure 1 is an exploded perspective view of a preferred embodiment of the present invention.

Fig. 2 is a perspective view of a stator assembly according to a preferred embodiment of the present invention.

Fig. 3 is a perspective exploded view of the stator assembly of the preferred embodiment of the present invention.

4 is a perspective view of the silicon steel sheet of the stator assembly of the preferred embodiment of the present invention.

Fig. 5 is a side view of the appearance of the stator assembly of the preferred embodiment of the present invention.

Fig. 6 is a perspective view of a conventional cooling fan.

Fig. 7 is an exploded perspective view of a conventional cooling fan.

Fig. 8 is a perspective view of the silicon steel sheet of the stator assembly of the existing cooling fan.

Fig. 9 is a side view of the appearance of a stator assembly of a conventional cooling fan.

In order to understand the technical features and practical effects of the present invention in detail, and to implement it in accordance with the content of the specification, the preferred embodiment shown in the drawings is further described in detail as follows: The present invention is a heat dissipation fan with a reduced thickness. The preferred embodiment is shown in FIGS. 1 to 3, which includes an outer casing 40, a stator assembly, and a fan cover 50, wherein: as shown in FIG. 1, a spindle is fixed in the center of the outer casing 40 401. The stator assembly is arranged in the outer shell 40 and surrounds the spindle 401, and the fan blade cover 50 is combined with the outer shell 40 through a rotor 501 set on the spindle 401, and covers the stator assembly The rotor 501 is located between the stator assembly and the spindle 401. When the stator assembly is energized to generate a magnetic field, it can drive the fan blade cover 50 to rotate, and drive airflow through the plurality of fan blades 51 of the fan blade cover 50. In order to achieve the effect of heat dissipation, the stator assembly includes a silicon steel sheet 10, a plurality of coils 20 and a set of rings 30.

As shown in FIG. 4, the silicon steel sheet 10 is a ring-shaped structure and has a plurality of teeth 11 and a plurality of connecting portions 14. Each tooth 11 is protruded on the outer periphery of the silicon steel sheet 10 in a radial direction. And spaced apart from other tooth portions 11, so that the plurality of tooth portions 11 are arranged in a ring shape and projected on the outer periphery of the silicon steel sheet 10, and a pocket 12 is formed between two adjacent tooth portions 11, and further, each tooth The end of the part 11 away from the center of the silicon steel sheet 10 forms a flange 111. The flange 111 is arc-shaped, so that an opening 13 is formed between the flanges 111 of two adjacent tooth parts 11, and the width of the opening 13 is smaller than The width of the pocket 12; each connecting portion 14 connects two adjacent tooth portions 11 of the silicon steel sheet 10, and the portion of each tooth portion 11 close to the connecting portion 14 is tapered to make the silicon steel sheet 10 outside The diameter and the inner diameter have the smallest difference at the connecting portion 14.

Preferably, the number of teeth 11 of the silicon steel sheet 10 and the number of corresponding pockets 12 are integer multiples of six, because the single-phase electricity should pass through the teeth 11 of the integer multiple of two, and the three-phase electricity should be connected. Through the teeth 11 of integral multiples of three, therefore, if the silicon steel sheet 10 has teeth 11 of integral multiples of six, it can After winding the plurality of coils 20, it is applicable to connect single-phase electricity or three-phase electricity. In the preferred embodiment of the present invention, the silicon steel sheet 10 has twelve teeth 11 and correspondingly form twelve capacitors. Slot 12.

As shown in FIGS. 2, 3, and 5, the plurality of coils 20 are respectively wound on the plurality of teeth 11 of the silicon steel sheet 10, and are located in the pocket 12 corresponding to the wound tooth 11, and each coil 20 It can be wound on one of the teeth 11, or on two or more adjacent teeth 11, as shown in FIG. 3. In the preferred embodiment of the present invention, each coil 20 is wound on one of the teeth. On the tooth 11 and located in the pocket 12 on both sides of the tooth 11, the tooth 11 and the flange 111 of the adjacent tooth 11 can prevent the coil 20 from passing through the opening 13 on both sides of the tooth 11 It slips off from the silicon steel sheet 10, and since the space on the outer periphery of the silicon steel sheet 10 is greater than the space on the inner periphery, when the coils 20 of the same number of turns are wound, the plurality of coils 20 do not need to travel to the silicon steel sheet. The upper and lower sides of the sheet 10 extend substantially to reduce the overall thickness T of the stator assembly.

As shown in Figures 2, 3 and 5, the collar 30 is sleeved on the plurality of teeth 11 of the silicon steel sheet 10, and surrounds the outer side of the plurality of coils 20, and the inner part of the collar 30 A plurality of grooves 31 are recessed at intervals on the periphery, so that when the collar 30 is sleeved on the silicon steel sheet 10, each groove 31 abuts against the flange 111 of one of the teeth 11, so that the collar 30 The inner periphery of the silicon steel sheet 10 matches the shape of the outer periphery of the silicon steel sheet 10, and the protruding part between the two adjacent grooves 31 extends into the opening 13 formed between the corresponding two flanges 111 to further prevent the plurality of coils 20 from falling off .

With the above technical features, the stator assembly of the heat dissipation fan with reduced thickness of the present invention can use an outer winding machine with higher winding efficiency when winding, thereby improving production efficiency. Further, as shown in FIG. 5, because the silicon steel sheet The outer periphery of 10 has a large space. After winding the plurality of coils 20, when the same number of coils 20 are wound, the overall thickness T of the stator assembly is smaller than the thickness T ₀ of the stator assembly 72 of the existing cooling fan 70 Therefore, there is no need to squeeze the plurality of coils 20 before assembling the cooling fan, which prevents the plurality of coils 20 from being damaged and further improves the yield of the cooling fan. In summary, the present invention effectively improves the disadvantages of the prior art. In order to provide a cooling fan with reduced thickness and simplified structure.

The above are only the preferred embodiments of the present invention, and do not limit the present invention in any form. Anyone with ordinary knowledge in the relevant technical field can use the present invention without departing from the scope of the technical solution proposed by the present invention. The disclosed technical content has partially changed or modified equivalent embodiments without departing from the technical solution content of the present invention, and all still fall within the scope of the technical solution of the present invention.

10: Silicon steel sheet

20: coil

30: collar

40: outer shell

401: Mandrel

50: fan blade cover

501: Rotor

51: fan blade

Claims (5)

A heat dissipation fan with a reduced thickness includes an outer casing, a stator assembly, and a fan cover. The stator assembly is arranged in the outer casing. The fan cover is rotatably combined with the outer casing and covers the stator The assembly, wherein the stator assembly includes: a silicon steel sheet, the silicon steel sheet is a ring-shaped structure, and has a plurality of teeth and a plurality of connecting parts, the plurality of teeth are annularly projected on the outer periphery of the silicon steel sheet Each of the connecting portions is connected to two adjacent teeth of the silicon steel sheet, and the part of each tooth near the connecting portion is tapered, so that the silicon steel sheet The outer and inner diameters have the smallest difference at the connecting part; a plurality of coils, the plurality of coils are respectively wound on the plurality of teeth of the silicon steel sheet, and are located in the pockets on both sides of the wound teeth ; And a set of rings, which are sleeved on the plurality of teeth of the silicon steel sheet, and surround the outer side of the plurality of coils; each end of the teeth away from the center of the silicon steel sheet forms a flange, and An opening is formed between the flanges of two adjacent tooth parts, the width of the opening is smaller than the width of the corresponding groove; the inner periphery of the ring is recessed with a plurality of grooves at intervals so that the ring is sleeved On the silicon steel sheet, each groove abuts against the flange of one of the teeth, and the protruding part between two adjacent grooves extends into the opening between the corresponding two flanges. The heat dissipation fan with a reduced thickness according to claim 1, wherein the flange of each tooth portion of the stator assembly is in an arc shape. The heat dissipation fan with reduced thickness as described in claim 1 or 2, wherein the number of teeth and slots of the silicon steel sheet of the stator assembly is an integer multiple of six. The heat dissipation fan with a reduced thickness as described in claim 3, wherein the silicon steel sheet of the stator assembly has twelve teeth and twelve pockets. The heat dissipation fan with a reduced thickness as described in claim 3, wherein each coil of the stator assembly is wound on one of the teeth and located in the pockets on both sides of the teeth.

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