TWM553370U - Centrifugal fan and impeller thereof - Google Patents

Description

Centrifugal fan and its impeller

The present invention relates to a centrifugal fan and an impeller thereof.

As the technology in the electronics field continues to evolve, the performance of the electronic components produced continues to increase. However, in general, the performance of electronic components increases, and the amount of heat generated increases. This heat is constantly accumulated on the electronic components, causing the temperature of the electronic components themselves to rise. The temperature of electronic products is getting higher and higher, which is prone to instability and affects product reliability. Therefore, existing electronic products often use fans as heat sinks.

Centrifugal fans are one of the current common heat sinks. The fan draws in gas through the air inlets located on the upper surface and the lower surface of the outer casing, and then exhausts the airflow through the air outlet located at the side to take away the heat energy.

When the centrifugal fan is running, the ribs inside the fan blade or fan pass through a specific position to cause a periodic change in air pressure. The frequency of the change in air pressure is related to the number of blades of the fan, the number of internal ribs, and the number of revolutions. Since the centrifugal fan has a particularly high volume at this frequency, it is liable to cause an auditory discomfort and cause noise.

On the other hand, the conventional centrifugal fan, when adjusting its characteristics, for example, adjusting the period, frequency, etc., is generally complicated by designing the number of blades or designing the shape of the blade.

The above information disclosed in the background section is only for enhancing the understanding of the background of the present invention, and thus it may include information that does not constitute a related art known to those of ordinary skill in the art.

A primary object of the present invention is to overcome at least the above-mentioned deficiencies of the prior art, to provide a centrifugal fan and an impeller thereof which are less noisy and which are convenient to adjust.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows.

According to one aspect of the present disclosure, an impeller includes a hub, a plurality of blades, and one or more rings. The hub has a circumferential surface; a plurality of blades are disposed at intervals on the circumferential surface; the ring is coupled to the plurality of blades, and a center of the ring is on a central axis of the hub, and the ring is provided A wave structure formed by a plurality of peaks and a plurality of troughs.

According to an embodiment of the present invention, the peak of the wave structure protrudes outwardly along the diameter direction of the hub, and the valley is convex inward.

According to an embodiment of the present invention, among the plurality of blades, the distance between the ends of the two farthest blades is defined as the outer diameter D of the impeller, and the distance between the two peaks of the ring which are the farthest apart It is defined as the outer diameter d of the ring, wherein the relationship between the outer diameter d of the ring and the outer diameter D of the impeller satisfies: 50% D ≤ d ≤ D.

According to an embodiment of the present creation, the wave structure of the ring has an amplitude of 1 mm to 4 mm, and/or the number of waves is 13 to 23.

According to an embodiment of the present invention, the circular cross section has a circular, elliptical, """ or "[" shape.

According to an embodiment of the present creation, the number of the rings is plural, one of which is disposed at an outer end of the blade.

According to another aspect of the present invention, an impeller includes a hub and a plurality of blades. The hub has a circumferential surface; a plurality of blades are disposed at intervals on the circumferential surface, wherein the lengths of the adjacent two blades are different, and the lengths of the plurality of blades are configured such that the outer end faces of all the blades are connected The annular surface formed is a wave surface having a plurality of peak faces and a plurality of trough faces.

According to an embodiment of the present invention, the peak of the wave surface faces outwardly along the diameter direction of the hub, and the valley faces inwardly.

According to an embodiment of the present creation, the wave face has an amplitude of 1 mm to 4 mm, and/or the number of the wave faces is 13 to 23.

According to an embodiment of the present invention, the impeller further includes an outer ring disposed at an outer end of the upper surface of the plurality of blades, the outer ring having a shape conforming to a shape of the wave surface.

According to an embodiment of the present invention, the impeller further includes at least one inner ring disposed on an upper surface of the plurality of blades, the inner ring having a shape conforming to a shape of the wave surface.

According to another aspect of the present invention, a centrifugal fan includes an outer casing and an impeller according to the present invention, the outer casing having one or more air inlets, one or more air outlets, and an accommodation space, the air inlet, the air inlet The accommodating space is in communication with the air outlet; the impeller is disposed in the accommodating space of the outer casing.

According to an embodiment of the present invention, the number of the air inlets is one, and the shape of the air inlet is wavy; or the number of the air inlets is plural, and the plurality of air inlets are arranged in a ring shape, and the plurality of inlets are arranged in a ring shape. The outer shape of the tuyere is wavy.

According to an embodiment of the present invention, the outer casing includes a base and an upper cover, the outer casing includes a base and an upper cover, the base includes a bottom plate and a flow channel wall, and the bottom end of the flow channel wall is connected to the periphery of the bottom plate and has a notch, The gap is used as the air outlet, the upper cover is connected to the top end of the flow channel wall, and the upper cover, the bottom plate and the flow channel wall enclose the accommodating space, and the air inlet is disposed on the upper cover and/or the bottom plate, the flow path The inner wall of the wall is a wave surface.

According to an embodiment of the present invention, the circumference of the upper cover corresponds to the air outlet and/or the flow path position is wavy.

According to the above technical solution, the creation has at least one of the following advantages and positive effects:

The impeller and the centrifugal fan formed by the present invention can control or adjust the fan characteristics by changing the height or the number of peaks of the wave structure or the wave surface due to the inclusion of a wave structure or a wave surface, without the need of the prior art. It is very convenient to design the fan blade shape or redesign the number of fan blades; at the same time, the creation operation has low noise and improves the sound quality.

Example embodiments will now be described more fully with reference to the drawings. However, the example embodiments can be embodied in a variety of forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete, and the concept of the example embodiments Those skilled in the art. The same element symbols in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Impeller embodiment 1

1 to 4, FIG. 1 is a schematic perspective view showing an embodiment of the impeller according to the present invention; FIG. 2 is a rear view of FIG. 1; FIG. 3 is a front view of FIG. 1; Top view of Figure 1.

As shown in FIGS. 1 to 4, the impeller 1 of this embodiment includes a hub 10, a plurality of blades 11, and one or more rings 12.

The hub 10 can have a conventional construction having a circumferential surface and a central axis.

A plurality of blades 11 are disposed on the circumferential surface of the hub 10 at a distance from each other. In the present creation, the number of the blades 11 is not limited, and may be arbitrarily increased or decreased according to actual needs. Each of the blades 11 has a windward side, a leeward side opposite to the windward side, an leeward upper surface and a lower surface connecting the windward side, an inner end surface close to the central axis of the hub 10, and an outer end surface remote from the central axis.

The ring 12 is connected to a plurality of blades 11 and the center of the ring 12 is on the central axis of the hub 10. The ring 12 can be made of metal material or plastic. When the ring 12 and the blade 11 are made of the same material, the two can be integrally molded by injection molding or the like. Of course, the present creation is not limited thereto, and in other embodiments, the two may be connected together by other means, for example, by a connector.

The cross-sectional shape of the ring 12 is circular (as shown in Fig. 1), and the cross-sectional shape of the ring 12 may be other shapes such as an ellipse, a "]" or a "[" shape.

As shown in FIG. 3, the specific arrangement position of the ring 12 can be determined according to the following relationship: among the plurality of blades 11, the distance between the ends of the two farthest blades 11 is defined as the outer diameter D of the impeller, and the circle The distance between the two most distant peaks of the ring 12 is defined as the outer diameter d of the ring. In an embodiment, the relationship between the outer diameter d of the ring and the outer diameter D of the impeller satisfies: 50% D ≤ d ≤ D, for example, d = 70% D, which is not limited thereto.

As shown in Figs. 1 to 3, the ring 12 is provided with a wave structure which can be formed by a plurality of peaks and a plurality of troughs. The crests of the wave structure project outwardly, i.e., project away from the central axis of the hub 10, and the troughs of the wave structure bulge inward. That is, it protrudes toward the center axis of the hub 10. In other embodiments, the direction in which the peaks and troughs are convex is not necessarily limited to the direction of the diameter, but may also be at an angle to the diameter direction, depending on the particular needs.

The wave heights of the plurality of peaks may be the same or different; the wave heights of the plurality of valleys may be the same or different. In this creation, the wave height of all the peaks and the wave height of all the troughs are the same as an example.

In the present creation, the impeller 1 may include a ring 12 (as shown in Fig. 1), and may also include a plurality of rings 12 (as shown in Fig. 12 includes two). In the case where the impeller 1 of the present invention has a plurality of rings 12, one of the rings 12 may be disposed at the outer end of the blade 11. Wherein the ring 12 is disposed at the outer end of the blade 11 including a plurality of cases: for example, when the lengths of the plurality of blades 11 (from the inner end to the outer end of the blade 11) are the same, all of the rings 12 can be The crests are connected to the outer end portions of the upper surfaces of the plurality of blades 11; alternatively, all or part of the troughs of the rings 12 may be coupled to the outer or outer end faces of the upper surfaces of the plurality of blades 11.

In an embodiment, the amplitude (peak to valley distance) of the wave structure of the ring 12 may be between 1 mm and 4 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc., and the present invention is not limited thereto. The amplitude of the wave structure is related to the blade diameter of the blade. The smaller the blade diameter of the blade, the smaller the amplitude of the wave structure. Those skilled in the art can design the amplitude according to the specific design requirements. The number of waves in the wave structure (one wave connected to one wave and one wave in one wave) is 13 to 23, for example, 19, and so on.

The impeller 1 of this embodiment can change the characteristics of the impeller such as flow rate, power, noise, and the like by changing the amplitude or the number of the wave structure at the time of manufacture, so that the characteristics of the impeller can be easily controlled and adjusted.

Impeller embodiment 2

Referring to Fig. 5, Fig. 5 is a perspective view showing another embodiment of the impeller of the present invention. As shown in Fig. 5, the impeller 1 of this embodiment includes a hub 10 and a plurality of blades 11.

The hub 10 can have a conventional construction having a circumferential surface and a central axis.

A plurality of blades 11 are spaced apart from each other on the circumferential surface of the hub 10. In this embodiment, the lengths of the adjacent two blades 11 are different, and the lengths of the plurality of blades 11 are designed such that the annular faces formed by connecting the outer end faces of all the blades 11 have a plurality of peak faces and The wave surface of multiple troughs. The wave heights of the respective peak faces may be the same or different; similarly, the wave heights of the plurality of wave faces may be the same or different. In this creation, the wave height of all the crest faces and the wave heights of all the troughs are the same as an example.

In the diametrical direction along the hub 10, the crests forming the wave faces project outwardly, i.e., project away from the central axis of the hub 10, and the troughs project inwardly, i.e., project toward the central axis of the hub 10. In other embodiments, the direction in which the peaks and troughs are convex is not necessarily limited to the direction of the diameter, but may also be at an angle to the diameter direction, depending on the particular needs.

The amplitude of the wave face of the ring 12 (the distance from the peak face to the trough face) may be between 1 mm and 4 mm, for example 1 mm, 1.5 mm, 2 mm, 2.5 mm, and the like. The number of waves in the wave (one wave face connected to one wave face and one wave face) is 13 to 23, for example, 19, and so on.

The impeller 1 of this embodiment can change the characteristics of the impeller such as flow rate, power, noise, and the like by changing the length difference between the blades at the time of manufacture. Therefore, this creation can easily control and adjust the characteristics of the impeller. The impeller 1 of this embodiment has similar effects to the impeller shown in Fig. 1 described above.

Impeller embodiment 3

6 to 11 , FIG. 6 is a schematic perspective view showing another embodiment of the impeller according to the present invention; FIG. 7 is a rear view of FIG. 1; FIG. 8 is a front view of FIG. 1; Fig. 10 is a plan view showing a modification of the impeller shown in Fig. 6; and Fig. 11 is a view showing another modification of the impeller shown in Fig. 6.

Further, as shown in FIGS. 6 to 9, further, an outer ring 13 is provided at an outer end portion of each of the blades 11 of the impeller 1 shown in FIG. 5, which is provided on the upper surfaces of the plurality of blades 11. The outer end portion has a shape in which the outer ring 13 conforms to the shape of the wave surface. The structure of the outer ring 13 can be the same as that of the ring 12 shown in Fig. 1.

The amplitude and the number of waves of the wave structure in the outer ring 13 can have various changes: the impeller 1 shown in Fig. 6 has an amplitude of 2.5 mm and the number of waves is 17; the impeller 1 shown in Fig. 10 has an amplitude It is 1 mm and the number of waves is 13. The impeller 1 shown in Fig. 11 has an amplitude of 4 mm and a wave number of 19.

Impeller embodiment 4

Further, as shown in Fig. 12, the impeller 1 further includes an inner ring 14 which is disposed on the upper surface of the plurality of blades 11, and the inner ring 14 has a shape conforming to the shape of the wave surface. The structure of the inner ring 14 can be the same as that of the ring 12 shown in Fig. 1. The number of inner rings 14 may also be plural.

Centrifugal fan implementation

Referring to FIG. 13 to FIG. 17 , FIG. 13 is a perspective view showing a three-dimensional structure of an embodiment of the centrifugal fan according to the present invention; FIG. 14 is a three-dimensional structure of the centrifugal fan according to another embodiment of the present invention. FIG. 15 is a schematic perspective view of the base; FIG. 16 is a schematic perspective view of the upper cover; and FIG. 17 is a schematic perspective view of another upper cover.

As shown in Figs. 13 and 16, the centrifugal fan of the present invention comprises a casing 2 and the impeller 1 of the present invention. The outer casing 2 includes a base and an upper cover 20, and the base includes a bottom plate 21 and a flow path wall 22. The bottom end portion of the flow path wall 22 is connected to the periphery of the bottom plate 21, and the flow path wall 22 has a notch for making a tuyere 24. The upper cover 20 is connected to the upper end of the flow channel wall 22. The upper cover 20, the bottom plate 21 and the flow channel wall 22 define an accommodating space, and the impeller 1 is disposed in the accommodating space.

As shown in Fig. 15, the bottom plate 21 is provided with three air inlets 23, and the three air inlets 23 are formed in a ring shape, and the outer shape of the air inlet port 23 has a wave shape. In some other embodiments, only one circular air inlet 23 or no air inlet may be disposed on the bottom plate 21. The inner side of the flow path wall 22, that is, the surface defining the flow path, is also wavy.

As shown in Fig. 16, the upper cover 20 is provided with a circular air inlet 23, and the air inlet 23 is wavy.

As shown in Fig. 17, the upper cover 20 has a wave shape corresponding to the peripheral edge 202 of the air outlet 24. Further, the edge 201 of the upper cover 20 corresponding to the flow channel wall 22 is also wavy. In one embodiment, the undulating edge 201 can conform to the inner wave shape of the flow channel wall 22.

When the fan is running, air enters the fan interior through the air inlet 23, and the air inlet 23, the periphery of the upper cover 20, and the inner side of the flow channel wall 22 are designed to be wave-shaped, which can assist in controlling and adjusting the characteristics of the fan such as flow rate and frequency.

The characteristics of the frequency of the centrifugal fan of the present invention are easily controlled, and the details are as follows:

The centrifugal fan of the present invention (using the impeller as shown in Fig. 6) and the conventional centrifugal fan (see Fig. 18, including the hub 10, the plurality of blades 11 and the ring 18, without a wave structure) are in the same condition. Bottom: The speed is 6000 rpm, the number of blades is 59, and their respective frequencies are as follows:

The conventional new centrifugal fan has a fan blade frequency of 5900 Hz (6000/60*59).

The fan frequency of the centrifugal fan (if wave period = 13) in one embodiment of the present invention may be:

1300Hz (6000/60*13).

The blade frequency of the centrifugal fan (if wave period = 19) in another embodiment of the present creation may be:

1900Hz (6000/60*19).

The blade frequency of the centrifugal fan (if wave period = 23) in still another embodiment of the present invention may be:

2300Hz (6000/60*23).

Therefore, under the same conditions, the fan frequency of the conventional new centrifugal fan is fixed; and the fan frequency of the centrifugal fan of the present invention can be changed by the period of the wave structure (the number of waves of the wave or The number of troughs is controlled.

The centrifugal fan of the present invention has controllable effects on noise and sound quality.

When the fan is running, a peak (FFT) associated with the number of blades is generated. The frequency corresponding to the peak is the blade frequency. Generally, the higher the peak, the greater the influence on the noise and sound quality, and the closer the peak appears to the center (FFT). The peak, the highest area of the hill, has a greater influence on the noise and the prominence ratio caused by the blade 11. The closer the peak appears to the right (high frequency), the greater the impact on the sound quality sharpness. By adjusting the parameters of the wave structure in the centrifugal fan of the present invention, the frequency of the blade 11 can be adjusted according to actual use requirements, thereby more effectively improving noise and sound quality.

The volume of swirling air of the blade 11 in the centrifugal fan of the present invention can be fine-tuned (associated with the parameters of the wave structure) to help improve fan characteristics.

The centrifugal fan of the present invention is under the same conditions as the conventional fan, for example, the outer diameter of the fan is 61.5 mm, the number of blades is 59, and the height of the blade is 3.5 mm. The volume of the respective rotating air is as follows:

Original air volume - fan blade 11 volume = fan blade rotating air volume

The volume of rotating air of a conventional fan: 11188.5-3875 = 7313.5 (mm ³ )

The volume of rotating air of a centrifugal fan (if wave period = 19, amplitude = 2) in one embodiment of the present invention may be:

11188.5-3800 = 7388.5 (mm ³ )

The volume of rotating air of a centrifugal fan (if wave period = 19, amplitude = 3) in another embodiment of the present invention may be:

11188.5-3760 = 7428.5 (mm ³ )

The volume of rotating air of a centrifugal fan (if wave period = 19, amplitude = 4) in still another embodiment of the present invention may be:

11188.5-3719 = 7469.5 (mm ³ )

Therefore, under the same conditions, the volume of the rotating air of the conventional new centrifugal fan is fixed, and the volume of the rotating air of the centrifugal fan can be adjusted by changing the amplitude of the wave (the height of the peak to the trough) depending on the demand situation.

When the centrifugal fan is operated, the rotation of the blade 11 will drive the air movement in the rotating volume. The volume of the rotating air will affect the flow generated when the blade 11 rotates, so the change of the volume of the rotating air will affect the flow of the fan. In general, an increase in the volume of the rotating air will contribute to the increase in flow.

In the above embodiments, relative terms such as "upper" or "lower" may be used to describe the relative relationship of one element to another. It will be understood that if the illustrated device is flipped upside down, the components described above will become "down" components. The terms "a", "an", "the" and "said" are used to mean the presence of one or more elements/parts. The terms "comprising", "including" and "having" are used to mean an inclusive meaning and are meant to include additional components and the like in addition to the listed components. "First" and "Second" are used only as markers, not as a limitation on the number of objects.

It should be understood that the present application does not limit its application to the detailed structure and arrangement of the components presented herein. The present creation can have other embodiments and can be implemented and executed in a variety of ways. The foregoing variations and modifications are within the scope of the present invention. It is to be understood that the disclosure disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or apparent in the drawings. All of these different combinations constitute a number of alternative aspects of the present work. The embodiments described herein illustrate the best manner known for implementing the present work and will enable those skilled in the art to utilize the present invention.

1‧‧‧ Impeller
10‧‧·wheels
11‧‧‧ fan leaves
12‧‧‧ Ring
13‧‧‧Outer Ring
14‧‧‧ Inner Ring
18‧‧‧ Ring
2‧‧‧ Shell
20‧‧‧Upper cover
201‧‧‧ edge
202‧‧‧ Periphery
21‧‧‧floor
22‧‧‧flow wall
23‧‧‧Air inlet
24‧‧‧air outlet
D‧‧‧ outer diameter of the ring
D‧‧‧ impeller outer diameter

Fig. 1 is a perspective view showing the structure of an impeller according to an embodiment of the present invention. Fig. 2 is a rear view of Fig. 1. Fig. 3 is a front view of Fig. 1. Fig. 4 is a plan view of Fig. 1. Fig. 5 is a front elevational view showing another embodiment of the impeller of the present invention. Fig. 6 is a perspective view showing another embodiment of the impeller of the present invention. Figure 7 is a rear view of Figure 6. Figure 8 is a front view of Figure 6. Figure 9 is a plan view of Figure 6. Fig. 10 is a view showing a modification of the impeller shown in Fig. 6. Fig. 11 is a view showing another modification of the impeller shown in Fig. 6. Fig. 12 is a front elevational view showing another embodiment of the impeller of the present invention. Fig. 13 is a perspective view showing the three-dimensional structure of an embodiment of the centrifugal fan according to the present invention. Fig. 14 is a perspective view showing the three-dimensional structure of an embodiment of the centrifugal fan of the present invention viewed from another angle. Fig. 15 is a perspective view showing the structure of the base in the centrifugal fan shown in Fig. 13. Fig. 16 is a perspective view showing the structure of an upper cover of the centrifugal fan shown in Fig. 13. Fig. 17 is a perspective view showing the structure of another upper cover of the centrifugal fan shown in Fig. 13. Figure 18 is a schematic perspective view of a conventional centrifugal fan.

1‧‧‧ Impeller

10‧‧·wheels

11‧‧‧ fan leaves

12‧‧‧ Ring

Claims (15)

An impeller comprising: a hub having a circumferential surface; a plurality of blades disposed on the circumferential surface spaced apart from each other; and one or more rings connected to the plurality of blades, and The center of the ring is on the central axis of the hub, and the ring is provided with a wave structure formed by a plurality of peaks and a plurality of troughs. The impeller according to claim 1, wherein the peak of the wave structure protrudes outward in a diameter direction along the hub, and the valley protrudes inward. The impeller according to claim 2, wherein among the plurality of blades, the distance between the ends of the two farthest blades is defined as the outer diameter of the impeller, and the two peaks of the ring are the farthest apart The distance between the two is defined as the outer diameter of the ring, wherein the outer diameter of the ring is less than or equal to the outer diameter of the impeller and greater than or equal to 0.5 times the outer diameter of the impeller. The impeller according to claim 1, wherein the wave structure of the ring has an amplitude of 1 mm to 4 mm, and/or the number of the waves is 13 to 23. The impeller according to claim 1, wherein the circular cross section has a circular, elliptical, """ or "[" shape. The impeller according to claim 1, wherein the number of the rings is plural, one of which is disposed at an outer end of the blade. An impeller comprising: a hub having a circumferential surface; and a plurality of blades spaced apart from each other on the circumferential surface, wherein lengths of adjacent two blades are different, and lengths of the plurality of blades are configured The annular surface formed by connecting the outer end faces of all the blades is a wave face having a plurality of crest faces and a plurality of trough faces. The impeller according to claim 7, wherein the peak of the wave face protrudes outward in a diameter direction along the hub, and the trough protrudes inwardly. The impeller according to claim 7, wherein the wave surface has an amplitude of 1 mm to 4 mm, and/or the number of the wave faces is 13 to 23. The impeller according to claim 7, further comprising: an outer ring disposed at an outer end of the upper surface of the plurality of blades, the outer ring having a shape conforming to a shape of the wave surface. The impeller according to claim 7 or 10, further comprising: at least one inner ring respectively disposed on the plurality of blade upper surfaces, the inner ring having a shape conforming to the shape of the wave surface. A centrifugal fan includes: a casing having one or more air inlets, one or more air outlets, and an accommodating space, the air inlet, the accommodating space being in communication with the air outlet And an impeller according to any one of the items 1 to 11, which is disposed in the accommodating space of the outer casing. The centrifugal fan according to claim 12, wherein the number of the air inlets is one, and the shape of the air inlet is wavy; or the number of the air inlets is plural, and the plurality of air inlets are arranged The shape of the outer side of the plurality of air inlets is wavy. The centrifugal fan of claim 12, wherein the outer casing comprises a base and an upper cover, the base comprises a bottom plate and a flow channel wall, the bottom end of the flow channel wall is connected to the periphery of the bottom plate and has a notch, The gap is used as the air outlet, the upper cover is connected to the top end of the flow channel wall, and the upper cover, the bottom plate and the flow channel wall enclose the accommodating space, and the air inlet is disposed on the upper cover and/or the bottom plate, the flow path The inner wall of the wall is a wave surface. The centrifugal fan of claim 14, wherein a circumference of the upper cover corresponds to the air outlet and/or the flow path is wavy.