CN101818739A - blower fan - Google Patents

Abstract

A blower fan includes a housing, a stator, and a fan wheel. The shell seat is provided with an accommodating space, the stator and the fan wheel are arranged in the accommodating space, and the shell seat is further provided with an air inlet and an air outlet which are communicated with the accommodating space; the fan wheel is provided with a hub and a plurality of fan blades, and the fan blades are connected with the hub. Wherein one end of the top edge of the fan blade is an air inlet end, the air inlet end is close to the air inlet of the shell seat, an air gap is arranged between the top edge of the fan blade and the top of the shell seat, a shortest distance is arranged between the air inlet end of the top edge and the top of the shell seat, and the width of the air gap is between 0.3 and 2.0 millimeters. Therefore, turbulence and noise generation are reduced.

Description

blower fan

technical field

The invention relates to a blower fan, in particular to a blower fan that reduces turbulent flow and improves the overall air intake and output volume.

Background technique

Please refer to FIG. 1 for the existing blower fan, which includes a shell base 7, a stator 8 and a fan wheel 9. The shell base 7 is provided with a shaft tube 71, an air inlet 72, and an air outlet 73. The shaft tube 71 is arranged at the bottom of the housing base 7. The stator 8 is combined with the outer peripheral surface of the shaft tube 71. The fan wheel 9 A mandrel 91 is rotatably combined with the inner peripheral surface of the shaft tube 71 through a bearing; the air inlet 72 and the air outlet 73 are respectively opened on the top and side wall of the shell seat 7; the fan wheel 9 has a The hub 92 and several fan blades 93, the hub 92 has a top cover part 921, a ring wall part 922 and a ring plate 923, the mandrel 91 is located at the axial center of the top cover part 921, the ring wall part 922 The outer peripheral edge of the top cover portion 921 is bent axially downward, and the ring plate 923 is formed by bending one end of the ring wall portion 922 radially outward. The plurality of fan blades 93 are arranged at equal intervals on the end of the ring plate 923 . Thereby, when the conventional blower fan is working, the fan wheel 9 can suck in the outside air from the air inlet 72 at the same time, and drive the air to concentrate to the air outlet 73 by means of the fan blades 93 and send it out.

The top edge of the fan blade 93 and the ring plate 923 are respectively formed parallel to the top and the bottom of the housing seat 7, wherein an air gap (W) is left between the top edge of the fan blade 93 and the top of the housing seat 7 ), so as to avoid friction and collision between the fan wheel 9 and the shell seat 7 when it rotates; At this time, the internal gas pressure of the shell seat 7 often forces the gas to pass through the air gap (W) to form a reverse overflow towards the air inlet 72, which hinders the flow of external air into the air inlet 72, and then affects the overall performance of the existing blower fan. At the same time, the reverse overflow gas is also likely to interfere with the gas that wants to enter the shell seat 7 to form a turbulence phenomenon, so it is easy to increase the overall noise of the existing blower fan and reduce its overall output. Air volume. For the above reasons, the existing blower fan really needs to be improved.

Contents of the invention

The present invention provides a blower fan, which is mainly to reduce reverse overflow gas, avoid turbulent flow and noise when entering the air, and increase the overall air intake, which is the main purpose of the invention.

The present invention provides a blower fan, which mainly has a relatively smooth gas flow path when the blower fan is driven, so as to increase the overall air output and air intake, which is a secondary purpose of the invention.

In order to achieve the aforementioned object of the invention, the technical means used in the present invention and the effects that can be achieved by means of the technical means include:

A blower fan includes a shell base, a stator and a fan wheel. The housing base has an accommodating space, the stator and the fan wheel are arranged in the accommodating space, and a shaft tube is arranged in the accommodating space; the housing base is also provided with an air inlet and an outlet communicating with the accommodating space The air outlet; the stator is combined with the shaft tube of the casing; the fan wheel has a hub and several fan blades, the fan wheel is combined with the shaft tube of the casing, and the fan blades are connected with the hub.

Wherein one end of the top edge of the fan blade is an air inlet end, and the air inlet end is close to the air inlet port of the casing seat, and there is an air gap between the top edge of the fan blade and the top edge of the casing seat, and the wind inlet end of the top edge There is a shortest distance between the end and the top of the housing base, and the air gap width is between 0.3 mm and 2.0 mm.

Thereby, a reduced diameter is formed between the top edge of the fan blade and the top of the housing seat, so that the reversely overflowing gas is not easy to flow back to the air inlet through the air gap, thereby preventing the air inlet from being close to the fan blade Turbulence and noise are generated at the air inlet end of the fan, thereby increasing the overall air intake of the fan.

Alternatively, the housing base of the fan is further provided with a bottom plate, which is arranged on the bottom of the housing base and has a second air inlet, and the second air inlet communicates with the accommodating space. Each of the fan blades has a bottom edge respectively, one end of the bottom edge is an air inlet end, and the air inlet end is close to the second air inlet of the bottom plate, and there is an air gap between the bottom edge of the fan blade and the bottom plate , and there is a shortest distance between the air inlet end of the bottom edge and the bottom plate, and the air gap width is between 0.3 mm and 2.0 mm.

Alternatively, the fan wheel is additionally provided with a ring plate connected to one end of the hub. The ring plate has a bottom edge, the end of the bottom edge away from the hub is an air supply end, there is a gap between the bottom edge and the bottom of the shell base, and the air supply end of the bottom edge is connected to the bottom of the shell base. There is a shortest distance between them, and the width of the gap is between 0.3 mm and 2.0 mm. In this way, turbulent flow is avoided between the ring plate and the bottom of the shell seat, and wind shear noise is reduced.

The beneficial effect that the present invention can achieve is that a reduced diameter is formed between the top edge of the fan blade and the top of the casing seat or between the bottom edge of the fan blade and the bottom of the casing seat, so that the gas overflowing in the opposite direction does not It is easy to flow back to the air inlet through the air gap, thereby avoiding turbulent flow and noise at the air inlet end of the air inlet near the fan blade, thereby increasing the overall air intake of the fan; or by means of the ring plate of the fan wheel There is a gap between the bottom edge and the bottom of the fan casing, and there is a shortest distance between the air supply end of the bottom edge of the ring plate and the bottom of the casing to avoid turbulent flow between the ring plate and the bottom of the casing , reduce wind shear noise.

Description of drawings

Figure 1: A combined cross-sectional view of an existing blower fan and a schematic diagram of gas flow.

Fig. 2: A combined cross-sectional view and a schematic diagram of gas flow of the first embodiment of the blower fan of the present invention.

Fig. 3: Partial enlarged view of the fan blade and the top of the housing seat of the first embodiment of the blower fan of the present invention.

Fig. 4: A combined sectional view and a schematic diagram of gas flow of the second embodiment of the blower fan of the present invention.

Fig. 5: Partial enlarged view of the ring plate and the bottom of the housing base of the second embodiment of the blower fan of the present invention.

Fig. 6: A combined cross-sectional view and a schematic diagram of gas flow of the third embodiment of the blower fan of the present invention.

Fig. 7: Partial enlarged view of the bottom edge of the fan blade and the bottom plate of the third embodiment of the blower fan of the present invention.

Description of main component symbols:

1 Housing seat 10 Accommodating space 11 Shaft tube 110 Bearing 12 Cover plate

121 First air inlet 13 Air outlet 14 Bottom plate 141 Second air inlet 2 Stator

3-fan wheel 31 hub 311 top cover 312 ring wall 32 mandrel

33 ring plate 331 bottom edge 331a air supply end 34 fan blade 341 top edge

341a air inlet 341b air outlet 342 bottom edge 342a air inlet 342b air outlet

35 diversion curved surface 7 shell seat 71 shaft tube 72 air inlet 73 air outlet

8 stator 9 fan wheels 91 mandrel 92 hub 921 top cover

922 ring wall part 923 ring plate 93 fan blade

Detailed ways

In order to make the above-mentioned and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention are specifically cited below, together with the accompanying drawings, as follows:

Referring to FIG. 2 , the blower fan according to the first embodiment of the present invention includes a casing 1 , a stator 2 and a fan wheel 3 . in:

The housing base 1 has an accommodating space 10, the stator 2 and the fan wheel 3 are both arranged in the accommodating space 10; the accommodating space 10 is provided with a shaft tube 11, and the stator 2 is combined with the shaft tube 11 The outer peripheral surface, and the fan wheel 3 is rotatably arranged in the shaft tube 11 through a bearing 110; the housing base 1 is also provided with a cover plate 12 and an air outlet 13, and the cover plate 12 is assembled on the housing base 1 and the cover plate 12 is provided with a first air inlet 121, and the axis position of the first air inlet 121 is just opposite to the shaft tube 11, and the air outlet 13 is formed on the side wall of the shell seat 1 , and the first air inlet 121 and the air outlet 13 communicate with the accommodating space 10 .

The fan wheel 3 has a hub 31, a core shaft 32, a ring plate 33 and several fan blades 34; the hub 31 has a top cover portion 311 and a ring wall portion 312, and the core shaft 32 is arranged on the top cover The position of the axis of the portion 311 is used to correspondingly combine with the shaft tube 11; An inner space (not shown) is formed around together, and the stator 2 is accommodated in the inner space; the ring plate 33 is radially connected to one end of the ring wall portion 312 . The plurality of fan blades 34 are disposed on the end surface of the ring plate 33 , and there is an air inlet area (not shown) between the plurality of fan blades 34 and the ring wall portion 312 .

The main design features of the blower fan of the present invention are: please refer to Fig. 2 and Fig. 3, each of the fan blades 34 has a top edge 341 respectively, and the two ends of the top edge 341 are respectively an air inlet end 341a and an air outlet The wind end 341b, the air inlet end 341a is the end of the top edge 341 close to the first air inlet 121, and the air outlet end 341b is the other end of the top edge 341, the top edge 341 and the shell base 1 There is an air gap between the cover plates 12, and the width of the air gap is between 0.3 and 2.0 mm, and the distance (T) from the air inlet end 341a to the cover plate 12 is not greater than the distance (T) from the air outlet end 341b to the cover plate 12 The distance (T′), the distance (T) is the shortest distance from the top edge 341 to the cover plate 12 .

Please refer to FIG. 3 again. During the working process of the blower fan of the present invention, outside air is sucked into the accommodation space 10 of the casing 1 from the first air inlet 121. When the fan blade 34 drives the gas toward the casing, When the air outlet 13 of 1 is flowing, the present invention forms an air flow channel with a reduced diameter between the fan blade 34 and the cover plate 12 and from the air outlet end 341b to the air inlet end 341a, thereby making the reverse direction The overflowing gas is not easy to flow back to the first air inlet 121 through the air gap, thereby avoiding turbulent flow at the first air inlet 121 close to the air inlet end 341 a and reducing wind shear noise.

4 and 5, the blower fan according to the second embodiment of the present invention also includes a casing 1, a stator 2 and a fan wheel 3, wherein the overall structure of the casing 1 and the stator 2 is the same as that of the aforementioned first embodiment. The same example will not be repeated. More specifically, the blower fan according to the second embodiment of the present invention can further have a smoother gas flow path to increase the overall air output and intake air volume. in:

The fan wheel 3 of the second embodiment of the present invention is also connected with the ring plate 33 at one end of the ring wall portion 312 of the hub 31, but the ring plate 33 and the ring wall portion 312 are joined at a non-right angle so that the ring The plate 33 is inclined outward and downward in the radial direction, so that the angle between the ring plate 33 and the ring wall portion 312 is larger than 90°. Moreover, the ring plate 33 has a bottom edge 331, the end of the bottom edge 331 away from the wheel hub 31 is an air supply end 331a, there is a gap between the bottom edge 331 and the bottom of the shell seat 1, and the width of the gap is between 0.3 to 2.0 millimeters, and there is a distance (D) between the air supply end 331a of the bottom edge 331 and the bottom of the shell seat 1, and the distance (D) is also the distance between the bottom edge 331 and the bottom of the shell seat 1 shortest distance. In addition, the connection between the ring plate 33 and the ring wall portion 312 is provided with a guide arc surface 35 , and the guide arc surface 35 is located at the bottom of the air inlet area.

Please refer to FIG. 5 again, the blower fan according to the second embodiment of the present invention reduces the gap between the bottom edge 331 and the bottom of the housing base 1 to 0.3 to 2.0 mm, so as to increase the distance between the bottom edge 331 and the housing base. The distance between the cover plates 12 of 1 makes the air flow channel between the cover plate 12 and the ring plate 33 in a diameter-expanding shape. Thereby, when the outside air is sucked into the air intake area from the first air inlet 121, the arc-shaped guide arc surface 35 guides the air to flow towards the fan blade 34, preventing the air from flowing between the ring wall portion 312 and the ring wall portion 312. A turbulent flow is formed between the plates 33, and at the same time, the diameter expansion design of the airflow channel from the guide arc surface 35 to the air outlet 13 not only makes the flow of the gas into the accommodating space 10 smoother, but also effectively improves the overall performance of the fan. At the same time, it can further avoid the formation of turbulent flow between the ring plate 33 and the bottom of the shell base 1, and reduce the wind shear noise.

Referring to FIG. 6 , the blower fan according to the third embodiment of the present invention also includes a casing 1 , a stator 2 and a fan wheel 3 . More specifically, the blower fan in the third embodiment of the present invention can be further selected to be a blower fan with two-way air intake. in:

The bottom of the shell seat 1 of the third embodiment of the present invention is further formed by a bottom plate 14; the shell seat 1 of this embodiment is provided with a first air inlet 121 on the cover plate 12, and is also provided with another bottom plate 14 at the same time. A second air inlet 141 , the first air inlet 121 and the second air inlet 141 are respectively arranged on the top and bottom of the housing 1 corresponding to the fan wheel 3 , and communicate with the air outlet 13 .

7, one end of the fan blade 34 of this embodiment is directly connected to the ring wall portion 312 of the hub 31, and each of the fan blades 34 has a top edge 341 and a bottom edge 342 respectively, and the top edge 341 and the bottom edge 342 respectively. The aforementioned first embodiment also has the air inlet end 341a and the air outlet end 341b, which will not be repeated here; in addition, the two ends of the bottom edge 342 of each fan blade 34 are respectively an air inlet end 342a and an air outlet end 342b, the air inlet end 342a is the end of the bottom edge 342 close to the second air inlet 141, and the air outlet end 342b is the other end of the bottom edge 342, there is an air gap between the bottom edge 342 and the bottom plate 14 The width of the air gap is between 0.3 and 2.0 mm, and the distance (H) from the air inlet end 342 a to the bottom plate 14 is not greater than the distance from the air outlet end 342 b to the bottom plate 14 . Moreover, the distance (H) from the air inlet end 342 a to the bottom plate 14 in this embodiment is equal to the distance from the air outlet end 342 b to the bottom plate 14 , so that the bottom edge 342 and the bottom plate 14 are parallel to each other.

During the working process of the blower fan of the present invention, external air is sucked into the accommodation space 10 of the housing base 1 from the first air inlet 121 and the second air inlet 141 at the same time, and the top edge 341 and bottom of the fan blade 34 are reduced The width of the air gap between the edge 342 and the cover plate 12 and the bottom plate 14, so that the gas overflowing in the opposite direction is not easy to flow back to the first air inlet 121 and the second air inlet 141 through the air gap, thereby avoiding The first air inlet 121 and the second air inlet 141 generate turbulence and wind shear noise near the air inlet ends 341a and 342a, so as to improve the overall air inlet efficiency.

Claims (9)

1. A blower fan, characterized in that it comprises: A shell seat is provided with a cover plate and an air outlet, the cover plate is arranged on the top of the shell seat and has a first air inlet, and the first air inlet and air outlet are connected to an accommodating space of the shell seat Pass; a stator disposed in the accommodating space; and a fan wheel, arranged in the accommodating space, the fan wheel has a hub and several fan blades, the fan blades are connected to the hub and each of the fan blades has a top edge; Wherein one end of the top edge of the fan blade is an air inlet end, the air inlet end is close to the first air inlet port of the cover plate, there is an air gap between the top edge of the fan blade and the cover plate of the housing base, and There is a shortest distance between the air inlet end of the top edge and the cover plate, and the width of the air gap is between 0.3 mm and 2.0 mm. 2. The blower fan according to claim 1, wherein the other end of the top edge of each fan blade is an air outlet end, and the distance between the air inlet end and the cover plate is not greater than the distance between the air outlet end and the air outlet end. distance between covers. 3. The blower fan according to claim 1 or 2, characterized in that, the shell seat is further provided with a bottom plate, the bottom plate is arranged on the bottom of the shell seat and has a second air inlet, and the second air inlet is connected to the The accommodating spaces are connected. 4. The blower fan according to claim 3, wherein each of the fan blades has a bottom edge, one end of the bottom edge is an air inlet end, and the air inlet end is close to the second air inlet of the bottom plate There is an air gap between the bottom edge of the fan blade and the bottom plate, and there is a shortest distance between the wind inlet end of the bottom edge and the bottom plate, and the width of the air gap is between 0.3 mm and 2.0 mm. 5. The blower fan according to claim 4, wherein the other end of the bottom edge of the fan blade is an air outlet end, and the distance between the air inlet end of the bottom edge and the bottom plate is not greater than the bottom edge The distance between the air outlet end and the bottom plate. 6. The blower fan according to claim 1 or 2, wherein the hub has a top cover portion and a ring wall portion, and the ring wall portion is formed by bending axially downward from the outer peripheral edge of the top cover portion , and the fan wheel is additionally provided with a ring plate, which is radially connected to one end of the ring wall portion. 7. The blower fan according to claim 6, wherein the ring plate has a bottom edge, the end of the bottom edge far away from the hub is an air supply end, and there is a gap between the bottom edge and the bottom of the shell seat There is a gap, and there is a shortest distance between the air supply end of the bottom edge and the bottom of the shell seat, and the width of the gap is between 0.3 mm and 2.0 mm. 8 . The blower fan according to claim 6 , wherein the included angle between the ring plate and the ring wall portion is greater than 90°, and the ring plate is inclined outward and downward in the radial direction. 9 . 9 . The blower fan according to claim 6 , wherein the fan wheel is further provided with a flow guiding arc surface, and the flow guiding arc surface is formed at the connection between the ring plate and the ring wall. 10 .

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