CN201486916U - Limiting structure of fan - Google Patents

Abstract

The utility model discloses a limit structure of fan, it has seted up an trompil on fan frame surface to be equipped with a bearing frame in fan frame inside. An impeller is accommodated in the fan frame and is pivoted with the bearing seat. And arranging a limiting piece on the fan frame and corresponding to the opening, so that the distance between the limiting piece and the impeller is smaller than the distance between the impeller blade and the fan frame. When the impeller moves out relative to the bearing seat, the impeller is stopped by the limiting piece, so that the mutual interference between the blades and the fan frame is avoided, and a reaction force is generated on the axis position of the impeller, so that the shaft lever of the impeller is kept on the same central axis with the bearing seat when the shaft lever is reset.

Description

Limiting structure of the fan

technical field

The utility model relates to a position-limiting structure, in particular to a position-limiting structure of a fan.

Background technique

With the vigorous development of high technology, the volume of chip electronic components in electronic equipment tends to be miniaturized, and the density per unit area is getting higher and higher, and its performance is continuously enhanced. Under these factors, its The total calorific value of electronic components increases almost year by year. If there is no good heat dissipation method to remove the heat energy generated by electronic components, these excessive temperatures will shorten the life of electronic components themselves, so how to remove these heat to avoid electronic components Overheating has always been a problem that cannot be ignored.

In order to solve the heat dissipation problem of electronic components, cooling fans are most commonly used to remove heat energy from electronic components. For example, in a notebook computer, a cooling fan is usually installed on the electronic components (such as chips, central processing units, integrated circuits, etc.) on the motherboard, and a heat exchange is achieved through the operation of the cooling fan. The air flow allows the electronic components to maintain their operating efficiency within a certain temperature range. At the same time, in order to consider the heat dissipation efficiency of the cooling fan and the thin design of the notebook computer, a side-blowing centrifugal fan (Blower Fan) is usually used to provide a high-pressure airflow for better heat dissipation. Effect.

Such a conventional centrifugal fan generally includes a casing, and a fan accommodated in the casing, and an air outlet is opened on one side of the casing. The fan is installed on a shaft cylinder in the casing, and there is an oil-impregnated bearing in the shaft cylinder, so that the fan is pivoted in the bearing with a rotating shaft, and after the rotating shaft passes through the bearing, the shaft cylinder A C-shaped buckle is provided on the bottom corresponding to the end of the rotating shaft, and the weight of the C-shaped buckle prevents the fan blade from coming out of the oil-impregnated bearing.

However, the structural design of the C-shaped buckle requires a certain space inside the shaft tube to accommodate the volume of the C-shaped buckle, so that the overall structure of the centrifugal fan cannot be thinner. And after running for a long time, its C-shaped clasp is easily worn out due to elastic fatigue, and still has the risk of loosening.

In addition, with the thinning of the internal space of the notebook computer, the height of the centrifugal fan is also greatly shortened. Therefore, there is a prior art of a centrifugal fan structure that does not use a C-shaped retaining ring. An air inlet is mainly provided on the upper and lower surfaces of the casing of the centrifugal fan, and the air is sucked into the casing from the air inlet through the operation of the fan blades, and the air is guided to the air outlet for blowing. In order to guide the airflow from the inside of the casing to the outside of the air outlet, the centrifugal fan will set the shaft cylinder and fan structure at an eccentric position, but the eccentric position is not at the center of the casing. In other words, after the shaft cylinder and the fan are arranged in an eccentric position, one side of the fan blade of the fan is wider than the housing, while the other side of the fan blade is shorter and wider than the housing. The distance forms a channel to guide the airflow.

In order to prevent the fan blade from coming out of the bearing, usually the air inlet of this type of centrifugal fan is designed with a smaller diameter in structural design, and the diameter of the air inlet is smaller than the outer diameter of the fan blade. The fan blade is stopped by the casing, and the rotating shaft of the fan blade is restricted from coming out of the bearing. However, this type of fan is small in size and relatively light in weight. If the casing itself restricts the rotation shaft of the fan from detaching from the bearing, the fan blades will inevitably collide with the casing. Because the distances between the fan blades and the two sides of the casing are different, the force arms when they collide with the casing are also different, so that the reaction forces on the two sides of the fan blades are also different. In this case, the light-weight fan is very likely to shift, shake or even get stuck in the bearing when the rotating shaft is reset due to the difference in the reaction force on the opposite sides of the fan blade, making the rotating shaft It cannot be kept on the same axis with the bearing, which will cause the rotation shaft and the bearing to interfere with each other, causing abnormal noise, unsmooth rotation, etc., and even worse, it will cause the function of fan rotation to fail, which will greatly increase the service life of the fan as a whole. shorten.

Therefore, how to solve the above-mentioned problems and deficiencies is the direction that relevant manufacturers engaged in this industry want to study and improve.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a limiting structure of the fan to improve the centrifugal fan. The casing itself restricts the rotation shaft of the fan from the bearing, so that the fan with too light weight is easy to be disengaged due to the blades facing each other. The reaction forces on the two sides are different, causing the rotating shaft to shift and shake when it is reset, causing the frictional loss between the rotating shaft and the bearing, and even the situation that the rotating shaft is locked in the bearing.

According to an embodiment of the present utility model, the position-limiting structure of a fan includes a fan frame, an impeller and a position-limiting member. Wherein, an opening is provided on the surface of the fan frame, and a bearing seat corresponding to the opening is provided inside the fan frame. And the impeller is arranged inside the fan frame, and the impeller has a hub and a plurality of blades arranged around the periphery of the hub, and the hub is provided with a shaft for pivoting in the bearing seat. Then the limiter is arranged on the fan frame and corresponds to the opening, and there is a first distance between the limiter and the hub, and a second distance between the blade and the fan frame, so that the first distance is smaller than the second distance. distance. When the impeller moves out relative to the bearing seat, the hub is stopped by the stopper to prevent the blade and the fan frame from interfering with each other, and a reaction force is generated at the axial center of the hub, so that the shaft remains in the same position as the bearing seat when it is reset. on the same central axis.

The utility model has the advantage that the limiter stops the hub of the impeller, prevents multiple blades on the periphery of the hub from colliding with the fan frame during operation, and the limiter is formed on the axis of the hub during the process of stopping the hub. A reaction force makes the shaft stay on the same central axis with the bearing seat when it is reset, so as to effectively improve the stability and smoothness of the impeller rotation. The detailed features and advantages of this utility model are described in detail below in the implementation manner, and its content is enough to make any person familiar with the related art understand the technical content of this utility model and implement it accordingly, and according to the content disclosed in this specification, the protection required With reference to the scope and accompanying drawings, anyone familiar with the related art can easily understand the aforementioned purpose and advantages of the present utility model.

Description of drawings

FIG. 1 is a schematic diagram of the appearance of a position-limiting structure of a fan according to an embodiment of the present invention;

Fig. 2 is a side sectional view of a position-limiting structure of a fan according to an embodiment of the present invention;

Fig. 3 is a side sectional view of the position-limiting structure of the fan turned upside down according to an embodiment of the present invention; and

Fig. 4 is a side sectional view of a position-limiting structure of a fan according to another embodiment of the present invention.

Description of main component symbols

10 fan frame

11 Bottom plate

12 side panels

121 Air outlet

13 cover

131 opening

14 accommodation space

15 bearing seat

151 bearing

152 Coils

153 magnets

20 impeller

21 wheels

211 bump

22 blades

23 shaft

30 limit pieces

31 connecting rib

32 bumps

D1 first distance

D2 second distance

Detailed ways

According to the position-limiting structure of the fan disclosed in the present invention, the fan referred to can be an axial fan (Axial Fan) or a centrifugal fan (Blower Fan), and the fan is applied to such as display card chipset, memory Modules or motherboard chipsets and other electronic devices that require heat dissipation. However, in the following embodiments of the present invention, a centrifugal fan is taken as an example, of course, the application products and scope of the present invention are not limited to the following embodiments.

Please refer to Figure 1 and Figure 2 at the same time. Wherein, FIG. 1 is a schematic diagram of the appearance of a position-limiting structure of a fan according to an embodiment of the present invention. Fig. 2 is a side sectional view of a position-limiting structure of a fan according to an embodiment of the present invention.

The limiting structure of the fan disclosed in the present invention includes a fan frame 10 , an impeller 20 and a limiting member 30 . Wherein, the structure of the fan frame 10 generally includes a bottom plate 11 , a plurality of side plates 12 standing on the periphery of the bottom plate 11 , and a cover plate 13 covering the side plates 12 . An accommodating space 14 is formed between the bottom board 11 , the plurality of side boards 12 and the cover board 13 . In addition, a bearing seat 15 located in the accommodating space 14 is disposed on the bottom plate 11 , and the bearing seat 15 and the bottom plate 11 can be integrally formed. And a bearing 151 is arranged inside the bearing seat 15 , and a coil 152 surrounds the outside, and at least one magnet 153 is arranged relative to the coil 152 . However, the electrodynamic interaction produced by the above-mentioned coil 152 and magnet 153 belongs to the general existing technology, and is not a technical feature of the present invention, so its detailed structural composition will not be repeated.

In addition, one side plate 12 of the fan frame 10 defines an air outlet 121 for guiding the airflow generated by the rotation of the impeller 20 to be blown out through the air outlet 121 . In addition, the cover plate 13 defines an opening 131 , and the opening position of the opening 131 corresponds to the installation position of the bearing seat 15 .

The impeller 20 is accommodated inside the accommodating space 14 of the fan frame 10 , and the impeller 20 has a hub 21 and a plurality of blades 22 arranged around the hub 21 . And a shaft 23 is provided in the hub 21 , so that the shaft 23 is correspondingly installed in the bearing 151 of the bearing housing 15 . The hub 21 and the plurality of blades 22 are driven to form a rotary motion through the pivoted shaft structure of the shaft 23 and the bearing 151 .

The limiting member 30 is disposed on the fan frame 10 and corresponds to the opening 131 of the cover plate 13 . A plurality of connecting ribs 31 are mainly disposed on the periphery of the limiting member 30 , and are connected to the inner wall of the opening 131 of the cover plate 13 by these connecting ribs 31 . And a protrusion 32 protrudes from one side of the limiting member 30 , so that the protruding position of the protrusion 32 corresponds to the top of the hub 21 .

It is particularly worth noting that there is a first distance D1 between the protrusion 32 and the hub 21, and there is a second distance D2 between the cover plate 13 and the blade 22, so that the first distance D1 is smaller than the second distance. D2. In other words, when the fan frame 10 is placed normally, its bearing seat 15 is located at the bottom of the fan frame 10 , and the impeller 20 is pivotally connected to the bearing seat 15 . In this way, when the hub 21 is in operation, the rotating blades 22 will not collide with the cover plate 13 of the fan frame 10 due to the second distance D2 between the cover plate 13 and the blades 22 .

If the same fan frame 10 is turned over, as shown in FIG. 3 , it is a side cross-sectional view of the position-limiting structure of the fan according to an embodiment of the present utility model turned upside down. After the fan frame 10 is overturned, the bearing seat 15 is turned upside down above the fan frame 10 , and the impeller 20 pivotally connected to the bearing seat 15 is located below the fan frame 10 . So that the shaft 23 of the impeller 20 will slide out from the bearing 151, as in this way, the protrusion 32 of the stopper 30 can be stopped at the axial center position of the hub 21, so that the shaft 23 and the bearing seat 15 Keep on the same central axis, thereby preventing the impeller 20 from coming out of the bearing housing 15 .

In addition, because the first distance D1 between the protrusion 32 and the hub 21 is smaller than the second distance D2 between the cover plate 13 and the blade 22 , when the fan frame 10 is turned upside down, except that the protrusion 32 can stop on the hub 21 In addition to preventing the impeller 20 from detaching from the bearing seat 15, it can also prevent the rotating blade 22 from hitting the cover plate 13, causing damage to the blade 22 or interference to stop the rotation.

Therefore, depending on the placement direction of the fan frame 10, the impeller 20 can generate a reaction force against the axial center of the hub 21 through the projection 32 of the stopper 30, so that the shaft 23 is reset. It can be kept on the same central axis with the bearing seat 15. Furthermore, the impeller 20 is stably fixed in the accommodating space 14 of the fan frame 10 to effectively prevent the blades 22 from colliding with the cover plate 13 of the fan frame 10 and avoid any damage or unsmooth operation of the blades 22 .

Therefore, when the impeller 20 is rotating, the shaft 23 can be firmly kept on the central axis of the bearing seat 15 through the structural design of the limiter 30, so as to prevent the shaft 23 of the impeller 20 from breaking away from the bearing seat 15, and Prevent the rotating blades 22 from colliding with the fan frame 10 . In this way, the surrounding air can be sucked into the accommodation space 14 of the fan frame 10 through the opening 131 through the stably rotating blades 22, and then blow the airflow through the air outlet 121 of the fan frame 10 through the blades 22, thereby removing Thermal energy of associated electronic devices.

Please also refer to FIG. 4 , which is a schematic side sectional view of a position-limiting structure of a fan according to another embodiment of the present invention. The structure of this embodiment is substantially the same as that of the above-mentioned embodiments, and only the differences will be described below. According to the limiting structure of the fan disclosed in the utility model, a protrusion 211 is provided on one side of the hub 21, so that there is a first distance D1 between the protrusion 211 and the limiting member 30, and the blade 22 and the cover plate 13 have a second distance D2 between each other, so that the first distance D1 is smaller than the second distance D2.

The first distance D1 between the protrusion 211 and the stopper 30 is designed to be smaller than the second distance D2 between the blade 22 and the cover plate 13, when the pair of impellers 20 moves relative to the bearing seat 15, the protrusion of the hub 21 211 is stopped by the limiting member 30 to prevent the rotating blade 22 from colliding with the cover plate 13 , causing damage to the blade 22 or interference to stop the rotation.

According to the function of the limiting structure of the fan disclosed in the utility model, the limiting member arranged at the opening of the fan frame is used to prevent the blades of the impeller from interfering with the fan frame, and when the hub collides with the limiting member, the The limiting member generates a reaction force at the axial center of the hub, so that when the shaft is reset, it can be kept on the same central axis as the bearing seat, so that the shaft can rotate stably and smoothly in the bearing.

Although the utility model is disclosed above with the foregoing embodiments, it is not intended to limit the utility model. Without departing from the spirit and scope of the utility model, all changes and modifications are within the scope of patent protection of the utility model.

Claims (5)

1. the limit structure of a fan is characterized in that, the limit structure of this fan includes: the fan frame, and the surface has perforate, and is provided with a pair of bearing support that should perforate in fan frame inside; Impeller is arranged on this fan frame inside, and this impeller has a wheel hub and a plurality of blade that is located on this wheel hub periphery, has one in this wheel hub in order to be hubbed at the axostylus axostyle in this bearing support; And bounding means, be arranged on this fan frame and to should perforate, this bounding means and this wheel hub have one first distance apart, this blade then has a second distance apart with this fan frame, and this first distance is less than this second distance, when relative this bearing support of this impeller shifts out, this wheel hub is subjected to the backstop of this bounding means, preventing that this blade and this fan frame from interfering mutually, and on the shaft core position of this wheel hub, produce a reaction force, when making this axostylus axostyle reset and this bearing support remain on the same central axis.

2. the limit structure of fan as claimed in claim 1 is characterized in that, this bounding means also comprises projection, and this projection is corresponding mutually with this wheel hub, and this first distance is formed between this projection and this wheel hub.

3. the limit structure of fan as claimed in claim 1 is characterized in that, this wheel hub also comprises a projection, and this projection is corresponding mutually with this bounding means, and this first distance is formed between this projection and this bounding means.

4. the limit structure of fan as claimed in claim 1 is characterized in that, this bounding means also comprises at least one connection rib, and this connection rib is connected in this tapping of this fan frame.

5. the limit structure of fan as claimed in claim 1 is characterized in that, this bearing support also comprises bearing, articulates mutually with this axostylus axostyle, and is arranged with coil in the outer rim of this bearing support, corresponds to this coil and is provided with at least one magnet.

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