TWI648473B - fan - Google Patents

Abstract

A fan includes: a shroud, which is a setting surface; a drive unit, which is provided on the shroud; and a blade group, which is provided on the drive unit, and the blade group has a plurality of blades. The blade group has a set diameter; and a casing, which covers the blade group and the driving unit, a first air outlet between the casing and the shroud, and the first air outlet has a width, The width is a set distance, and a mask of the casing has a second air outlet, and the ratio of the set distance to the set diameter is between a first predetermined ratio and a second predetermined ratio.

Description

fan

A fan, especially a fan capable of providing positive pressure exhaust circulation.

The ceiling circulation fan is an energy-saving and comfortable fan that can increase the air-conditioning set temperature. However, the existing ceiling circulation fan has the disadvantages of poor circulation efficiency, being too prominent and unattractive, and unable to resist static pressure and safety factors.

In addition to the above-mentioned shortcomings, the existing ceiling circulation fan still has three problems to be faced, one is space, the other is performance, and the third is height.

The space problem is that if the ceiling circulation fan is installed on the light steel frame, the whole machine will protrude from the light steel frame, the installation is limited, and it is susceptible to static pressure and stall.

The performance problem is a demand for higher efficiency after the amendment of related regulations, but the existing ceiling circulation fan system cannot meet the demand for higher efficiency.

The height problem is that the ceiling circulation fan has a thin and thin development and design requirement, and the existing ceiling circulation fan system cannot meet the thin and thin requirement.

As mentioned above, there is still room for improvement in how to overcome the above-mentioned shortcomings and problems, and make the existing ceiling circulation fan comply with the thinning and improving the efficiency.

The invention provides a fan. The fan includes: a shroud, which is a setting surface; a drive unit, which is provided on the shroud; and a blade group, which is provided on the drive unit and the blade. The group has a plurality of blades, the blade group has a set diameter; a hub is provided on the shroud, the shroud has a flow guiding structure, and the driving unit is surrounded by the flow guiding structure and the hub , The drive unit has a shaft Center, the axis is coupled to the blade group, and the blades are arranged on the hub; and a casing, which covers the blade group and the driving unit, and a first section is arranged between the casing and the shroud. An air outlet, the first air outlet has a width, the width is a set distance, and a mask of the casing has a second air outlet; wherein the ratio of the set distance to the set diameter is between a first predetermined ratio and a second predetermined Between the ratios, the first predetermined ratio is 0.1; the second predetermined ratio is 0.3.

10‧‧‧ Shroud

100‧‧‧ diversion structure

11‧‧‧Drive unit

110‧‧‧rotation shaft

111‧‧‧Stator set

112‧‧‧rotor set

13‧‧‧ blade set

130‧‧‧ Wheel

131‧‧‧ Blade

1310‧‧‧ Leading edge

1311 ‧ ‧ ‧

1312‧‧‧arc

12‧‧‧shell

120‧‧‧first air outlet

121‧‧‧second air outlet

A ~ P‧‧‧Curve

R‧‧‧Maximum thickness

S‧‧‧Max camber

SH‧‧‧Set distance

SD‧‧‧set diameter

SL‧‧‧string length

20‧‧‧ Shroud

200‧‧‧ diversion structure

21‧‧‧Drive unit

23‧‧‧ Blade Set

22‧‧‧shell

220‧‧‧ Orifice

221‧‧‧second air outlet

FIG. 1 is a schematic diagram of a first embodiment of a fan according to the present invention.

Figure 2 is a graph of the width of an air inlet and the air volume at multiple speeds.

Figure 3 is a graph of the width of an air inlet and the air volume at multiple speeds.

Figure 4 is a graph of the width of the air inlet and the attenuation range.

Figure 5 is a graph of static pressure and air volume.

Figure 6 is a schematic diagram of a 4-digit NACA.

FIG. 7 is a schematic diagram of a second embodiment of a fan according to the present invention.

The following is a description of specific embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

Please refer to FIG. 1 for reference. The present invention is a fan. This embodiment is an inner rotor fan, which has a shroud 10, a driving unit 11, a casing 12, and a blade group 13.

The shroud 10 is a setting surface, and the setting surface may be a wall surface, a ceiling, a light steel frame, or a flat plate fixing surface. The deflector cover 10 is used for fixing a deflector structure 100. The diversion structure 100 is located at the center of the diversion cover 10. The diversion structure 100 has a curved surface and forms a diversion area with the diversion cover 10. A hub 130 is disposed on one end of the flow guiding structure 100.

The driving unit 11 is surrounded by the flow guiding structure 100 and the hub 130. The driving unit 11 may be a thin motor. The driving unit 11 has a rotating shaft 110, a certain sub-group 111 and a rotor group 112. The rotating shaft 110 is disposed through the center of the stator group 111 and is fixed to the hub 130. The rotor group 112 surrounds the stator group 111 and is connected to one of the rotating shafts 110. The ends are pivoted to each other.

The blade group 13 has a plurality of blades 131, or the blade group 13 has a plurality of blades 131 and the above-mentioned hub 130, which are integrated with each other. The blades 131 are located on the outer peripheral side of the hub 130. The blade 131 is an asymmetric thickness airfoil or has an airfoil. The airfoil is a National Aviation Advisory Committee (NACA) airfoil or a streamline asymmetric shape. Count NACA airfoil or 6 digit NACA airfoil. In another embodiment, the hub 130 and the stator group 111 can be considered as one body, but it is not limited. The hub 130 is provided on the driving unit 11, and the driving unit 11 drives the blade group 13 to rotate the blade group 13.

In other embodiments, the driving unit 11 has a shaft center, the shaft center is D-shaped, the shaft center is coupled to the blade group; or the driving unit 11 has a housing, and the hub 130 is glued to the housing ; Or the driving unit 11 has a housing, and the hub 130 is combined with the housing by a fixing member or a tenon fastener; or the blade set 13 is coupled with the driving unit 11 by a ring-shaped reverse tooth.

Please refer to FIG. 6 for reference. If the blade 131 is a 4-digit NACA number, the blade 131 has a string length (SL). The blade 131 has a leading edge 1310, an arc 1312, and a trailing edge 1311. The chord length SL is a straight line distance from the leading edge 1310 to the trailing edge 1311. The arc 1312 is the bending distance from the leading edge 1310 to the trailing edge 1311. As shown in FIG. 6, at the position of 4/10 of the chord length SL, it is the maximum thickness R of the blade 131, and the maximum thickness R is about 12% of the chord length SL. At this position, it is the maximum camber S of the blade 13, and the maximum camber S is about 8% of the chord length SL. The casing 12 is used to cover the blade group 13 and the driving unit 11. There is a first air outlet 120 between the casing 12 and the shroud 10. The first air outlet 120 may be an air outlet or an air inlet. A mask of the casing 12 has a second air outlet 121. The second air outlet 121 may be an air inlet or an air outlet. For example, if the first air outlet 120 is an air inlet, the second air outlet 121 is an air outlet. Conversely, if the first air outlet 120 is an air outlet, the second air outlet 121 is an air inlet.

The first air outlet 120 has a width, the width is a set distance SH (short for set height), and the blade group 13 has a set diameter SD (short for set diameter), and the ratio of the set distance to the set diameter is between the first Between the predetermined ratio and the second predetermined ratio between.

The ratio between the set distance and the set diameter is greater than or equal to a first predetermined ratio, and the ratio between the set distance and the set diameter is less than or equal to a second predetermined ratio. The first predetermined ratio is 0.1, and the second predetermined ratio is 0.3.

For example, if the distance is set to SH and the diameter is set to SD. The first predetermined ratio ≦ SH / SD ≦ the second predetermined ratio.

The invention can be arranged on a setting surface, such as a wall surface, a ceiling or a light steel frame. Because the blade 131 of the present invention has an asymmetric thickness airfoil or NACA airfoil, it will not cause stall phenomenon under strong turbulent flow field or high static pressure, and can drive sufficient air volume.

In addition, since the blade group 13 of the present invention is a multi-winged flat thin blade, the thickness of the mandrel and the blade can be reduced. This makes the overall fan thinner.

In addition, the blade set 13 of the present invention has a design that can be reversed to provide a double cycle of exhaust or suction. When the blade group 13 is not turned over, it provides a positive pressure exhaust circulation. The above-mentioned first air outlet 120 is an air inlet, and the above-mentioned second air outlet 121 is an air outlet.

When the blade group 13 is reversed, it provides a negative pressure suction cycle. The first air outlet 120 is an air outlet, and the second air inlet 121 is an air inlet.

Please refer to Figure 2, which is a graph of the width of the air inlet (mm) and the air volume (CMM) at multiple speeds. In this embodiment, the blade group 13 is 14 inches. The curve A indicates the blade group 13 at 1000 revolutions (rpm). Curve B indicates the blade group 13 at 900 rpm. The curve C indicates the blade group 13 at 600 rpm. The curve D indicates the blade group 13 at 300 rpm. As shown in FIG. 2, when the width (mm) of the air inlet reaches 60 mm, the blade group 13 at each rotation speed reaches a better air volume.

Please refer to Figure 3 for reference, which is a graph of the width of the air inlet (mm) and the air volume (CMM) at multiple speeds. The width of the air inlet (mm) is the above-mentioned set distance SH (set height for short) ). In this embodiment, the blade group 13 is 20 inches. The curve E indicates the blade group 13 at 300 rpm. Curve F indicates the blade group 13 at 600 rpm. The curve G indicates the blade group 13 at 1000 rpm. The curve H indicates the blade group 13 at 1200 rpm. The curve I indicates the blade group 13 at 1500 rpm. The curve J indicates the blade group 13 at 1800 rpm. As shown in FIG. 3, when the width (mm) of the air inlet reaches 100 mm, the blade group 13 at each rotation speed achieves a better air volume.

Please refer to Figure 4, which is a graph showing the width of the air inlet (mm) and the attenuation range. The curve L indicates the blade group 13 at 900 rpm. The curve H indicates the blade group 13 at 1000 rpm. The curve M indicates the blade group 13 at 600 rpm. Curve N indicates the blade group 13 at 300 rpm. As shown in Figure 4, when the width of the air inlet (mm) reaches 74mm, the attenuation range of the blade group 13 at each speed reaches 90%. And when the width of the air inlet (mm) reaches 100, the attenuation range of the blade group 13 at each speed reaches 95%.

Please refer to Figure 5, which is a graph of static pressure (mmAq) and air volume (CMM). The curve Q represents an existing fan, which is used for an existing ceiling circulation fan. The curve P represents the blade group 13 of the present invention. As shown in Fig. 5, the curve Q is unable to resist a pressure of 1 mmAq or more. The curve P indicates that the blade group 13 of the present invention can resist a pressure of 1 mmAq or more.

Please refer to FIG. 7 for reference. The present invention is a second embodiment of a fan. The fan has a shroud 20, a driving unit 21, a housing 22, a flow guiding structure 200, and a blade group 23.

The shroud 20 is a setting surface. The guide structure 200 is fixed to the guide hood 20. The driving unit 21 is fixed to the shroud 20. The blade group 23 is fixed on the outer rotor of the driving unit 21 and is an outer rotor fan.

In this embodiment, the blade group 23 is fixed to the end of the rotor outside the driving unit 21 with a fixing member.

The casing 22 covers the blade group 23 and the driving unit 21. A first tuyere (not shown) is provided between the casing 22 and the shroud 20. A mask of the casing 22 has a perforated plate 220, and the perforated plate 220 has at least one second air outlet 221.

The effects to be achieved in this embodiment are as shown in Figures 2 to 5 above, so they are not described in detail here, and they will be described first.

To sum up, the blade system of the present invention has a flip design, and can achieve the effect of exhaust or suction double circulation. The invention does not cause a stall phenomenon under a strong turbulent flow field or a high static pressure, but can promote a sufficient air volume.

The specific embodiments described above are only used to illustrate the features and effects of the present invention, rather than to limit the implementable scope of the present invention. Under the spirit and technical scope, any equivalent changes and modifications made by using the content disclosed in the present invention should still be covered by the scope of patent application described below.

Claims (13)

A fan includes: a shroud, which is a setting surface; a drive unit, which is provided on the shroud; and a blade group, which is provided on the drive unit, and the blade group has a plurality of blades, The blade set has a set diameter; a hub is attached to the shroud, the shroud has a flow guide structure, the drive unit is surrounded by the flow guide structure and the hub, and the drive unit has a A shaft center, the shaft center being coupled to the blade group, the blades being provided on the hub; and a housing covering the blade group and the driving unit, the housing and the shroud having A first air outlet, the first air outlet has a width, the width is a set distance, a mask of the casing has a second air outlet; wherein the ratio of the set distance to the set diameter is between the first predetermined ratio and the first Between two predetermined ratios, the first predetermined ratio is 0.1; the second predetermined ratio is 0.3. The fan according to item 1 of the scope of patent application, wherein the ratio of the set distance to the set diameter is greater than or equal to the first predetermined ratio; the ratio of the set distance to the set diameter is less than or equal to the second predetermined ratio. The fan according to item 1 of the scope of patent application, wherein the installation surface is a wall surface, a ceiling, a light steel frame or a flat plate fixing surface. The fan according to item 1 of the patent application scope, wherein the shroud has a flow guiding structure, and the flow guiding structure is located at the center of the shroud. The fan according to item 4 of the scope of patent application, wherein the flow guiding structure has a curved surface. The fan according to item 1 of the patent application scope, wherein the driving unit is a thin motor. The fan according to item 1 of the patent application scope, wherein the blade group has a plurality of blades and a hub, and the blades are arranged on the hub. The fan according to item 1 of the patent application scope, wherein the blades have an airfoil or an asymmetric airfoil, and the airfoil has a NACA airfoil or a streamline asymmetric shape. The fan according to item 1 of the scope of patent application, wherein the driving unit has a rotating shaft, a certain sub-group and a rotor group, the rotating shaft system is arranged in the center of the stator group, and the rotor group is surrounded by the stator group; The blade group has a hub and a plurality of blades, and the blade systems are located on the outer peripheral side of the hub; the hub system is coupled to the rotor group. The fan according to item 4 of the scope of patent application, wherein the guide structure and the guide cover form a guide area. The fan according to item 1 of the patent application scope, wherein the driving unit has a rotating shaft, a certain sub-group and a rotor group. The fan according to item 1 of the scope of patent application, wherein the rotor group is surrounded by the stator group and is pivotally connected to one end of the rotating shaft. The fan according to item 1 of the patent application scope, wherein the blade group is fixed on a rotor outside the driving unit.