CN106194786B - Fan reaches hand dryer including it - Google Patents

Abstract

The invention provides a fan and a hand dryer comprising the fan, wherein the fan comprises an impeller, a motor and a fan shell, the fan shell comprises a first shell for accommodating the motor and a second shell for accommodating the impeller, and the first shell and the second shell are fixedly connected up and down and are communicated with each other; two relative air outlets, each are seted up to the one end that first casing was kept away from the second casing the air outlet is formed by the incision of an extroversion slope, the incision includes two oblique sides, each oblique side with contained angle A between the axial of first shell is 0 ~ 45 degrees, contained angle B between the oblique side of an oblique side in the air outlet and another adjacent air outlet is 15 ~ 45 degrees. The invention enlarges the air outlet area of the fan shell, effectively reduces the air resistance in the running process of the fan, and can effectively improve the air flow of the motor under lower input power. And simultaneously, the volume of the fan is further reduced.

Description

Fan reaches hand dryer including it

Technical Field

The invention relates to a fan and a hand dryer comprising the same, in particular to a fan shell.

Background

Prior art fans typically include a housing and a motor and impeller mounted within the housing. As shown in fig. 1, the casing 1 includes a motor housing 11 that houses the motor and an impeller housing 12 that houses the impeller. The impeller housing 12 and the motor housing 11 are integrally connected. The impeller housing 12 is provided with openings 13 for air inlet and correspondingly the motor housing 11 is provided with openings 14 for air outlet. The openings 14 are formed by cutouts parallel to the axis of the motor housing 11 and are evenly distributed around the outer circumferential surface of the motor housing 11.

When the fan is in operation, the impeller is driven by the motor to generate a high pressure airflow to be discharged from the opening 14. Such a fan is commonly used in appliances such as hand dryers, vacuum cleaners and the like in real life. For example, a fan for a hand dryer requires a large air outlet flow rate, can blow dry water on hands quickly, and requires a fan volume as small as possible, thereby reducing the occupied space of a toilet. However, the air resistance of the high pressure air flow discharged from the air outlet is large and the air flow rate is small in the conventional blower. If the flow is increased, the input power of the fan must be increased. Therefore, the overall efficiency of the motor is not high and the size of the fan is large.

In view of the above, the present invention is directed to a fan with high efficiency and small size.

Disclosure of Invention

The invention provides a fan, which comprises an impeller, a motor and a fan shell, and is characterized in that: the fan shell comprises a first shell for containing the motor and a second shell for containing the impeller, and the first shell and the second shell are fixedly connected up and down and are communicated with each other;

two relative air outlets, each are seted up to the one end that first shell was kept away from the second shell the air outlet is formed by the incision of an outward slope, the incision includes two oblique sides, each oblique side with contained angle A between the axial of first shell is 0 ~ 45 degrees, the circumference span on incision base is 135 ~ 165 degrees.

Preferably, the inclined side edge (or the extension line thereof) of each air outlet and the bottom edge (or the extension line thereof) thereof intersect at a first point and a second point, the first points of the two air outlets are adjacently arranged, and in a radial plane passing through the bottom edges of the air outlets, an included angle B between a connecting line connecting the center of the first housing and the first points of the two air outlets is 15-45 degrees.

Preferably, each air outlet has a height H1, the height from the top of the air outlet to the bottom of the first housing is H2, and the ratio between H1 and H2 is 20/77.3-46/77.3.

Preferably, the included angle B is 45 degrees, and the ratio between H1 and H2 is 43/73.

Preferably, the first housing is a hollow cylinder, and an end cover is fixedly connected to an end of the cylinder far away from the second housing.

Preferably, the end cover is provided with a boss, and a through hole is formed in the boss and used for accommodating a bearing.

Preferably, the second housing includes a circular ring-shaped wall, one end of the circular ring-shaped wall is connected with the first housing through a flange, and the other end of the circular ring-shaped wall is connected with a bottom cover.

Preferably, an air inlet is formed at the center of the bottom cover.

The invention also provides a hand dryer which is characterized by comprising the fan.

The positive progress effects of the invention are as follows: according to the invention, through specially designing the shape and structure of the air outlet, the area of the air outlet of the fan shell is enlarged, the air resistance in the running process of the fan is effectively reduced, and the air flow of the motor can be effectively improved under the condition of lower input power. And simultaneously, the volume of the fan is further reduced.

For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.

Drawings

Fig. 1 is a perspective view of a prior art blower housing.

FIG. 2 is a perspective view of a fan housing of the present invention.

FIG. 3 is a front view of a fan housing of the present invention.

FIG. 4 is a top view of a fan housing of the present invention.

Fig. 5 is a perspective view of the fan of the present invention.

Fig. 6 is a schematic structural view of the fan of fig. 5 with the second housing removed.

FIG. 7 is a table of performance parameters for a prior art wind turbine.

FIG. 8 is a table of performance parameters for a wind turbine employing the present invention.

Detailed Description

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings. The drawings are only for reference and illustration purposes and are not intended to limit the invention. The dimensions shown in the figures are for clarity of description only and are not to be taken as limiting the scale.

The fan according to an embodiment of the present invention, which may be used in an electric appliance such as a hand dryer, includes an impeller, a motor (not shown), and a fan housing. Referring to fig. 2 to 4, the fan housing 2 includes a first housing 21 and a second housing 22, the first housing 21 accommodating the motor, and the second housing 22 accommodating the impeller. The first housing 21 and the second housing 22 are fixedly connected up and down and communicate with each other. Preferably, the second housing 22 comprises an annular wall having one end connected to the first housing 21 via the flange 23 and the other end connected to a bottom cover 221. An air inlet 222 is opened at a central position of the bottom cover 221 for introducing air. In addition, in the embodiment, the first housing 21 is a hollow cylinder, and an end cap 213 is fixed to an end of the cylinder away from the second housing 22. The end cap 231 is provided with a boss 214, and a through hole (not shown) is formed in the boss 214 for accommodating a bearing.

Two opposite air outlets 211 are formed at an end of the first housing 21 away from the second housing 22, and each air outlet 211 is formed by an outwardly inclined cut. The notch includes two oblique sides 212 and a bottom side, and an included angle a between each oblique side 212 and the first housing 21 in the axial direction is 0 to 45 degrees, i.e., an included angle a between one oblique side 212 and a line P in fig. 2 to 4 is 0 to 45 degrees. The line P is parallel to the axis of the first housing 21.

As shown in fig. 4, the inclined side 212 (or an extension line thereof) of each air outlet 211 intersects with the bottom side (or an extension line thereof) at a first point and a second point, the first points of the two air outlets 211 are adjacently arranged, an included angle B between a connecting line connecting the center of the first housing 21 and the first points of the two air outlets 211 is 15 to 45 degrees, and a circumferential span of each air outlet 211 (i.e., a circumferential span between the first point and the second point of each air outlet 211) is 135 to 165 degrees in a radial plane passing through the bottom sides of the air outlets 211. Preferably, the circumferential width of the bottom edge of each air outlet 211 is 150 degrees, and the included angle B is 30 degrees. The bottom edge of the cutout is substantially perpendicular to the axis of the first housing 21. By adopting the matching of the included angle A and the included angle B in the range, the wind resistance can be effectively reduced, the air flow is increased, and the input power and the rotating speed of the fan are reduced, so that the efficiency of the fan is improved, and the service life of the fan is prolonged. In addition, when the diameter of the wind drum of the fan is reduced to be less than 90 cm, the requirements on flow and pressure can be met.

Further, each air outlet 211 has a height H1, the height from the top of the air outlet 211 to the bottom of the first housing is H2, and the ratio between H1 and H2 is 20/77.3-46/77.3. The use of such a range of ratios results in a significant and economical increase in air flow and decrease in input power.

Particularly, when the included angle B is 45 degrees and the ratio between H1 and H2 is 43/73, the maximum flow of the fan can reach 40L/S, and meanwhile, the input power of the fan is obviously reduced and is reduced from 736W to 571W; the rotating speed of the fan is reduced, and the rotating speed is reduced from the original 33978Rpm to 32226 Rpm; the fan efficiency is also increased. This improves the life of the fan, and is a significant breakthrough especially for fans with a blower diameter of less than 90 cm.

As shown in fig. 5 and 6, the fan further includes a motor 3, a diffuser 5, and an impeller 6 assembled in the fan housing 2. The motor 3 is installed in the first housing 21, and includes a commutator 4 and brushes 7, the commutator 4 is installed in the first housing 21 and connected to the boss 214, and the two brushes 7 are disposed on the end cap 213 and aligned with two sides of the commutator 4, respectively. The diffuser 5 and the impeller 6 are sequentially disposed at the bottom of the motor 3 and are accommodated in the second housing 22. The impeller 6 is fixed to the rotor of the motor 3 so as to generate an air flow as it rotates, and the diffuser 5 is located downstream of the impeller 6 in the air flow direction.

As further shown in fig. 7 and 8, as the diameters of the air inlets of the fan housing of the prior art fan and the fan housing of the fan of the present invention are both 31.7mm, the input power required by the fan of the present invention is significantly less than that required by the prior art fan, and accordingly the efficiency of the fan of the present invention is significantly higher than that of the prior art fan.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. The utility model provides a fan, includes impeller, motor and fan casing, its characterized in that: the fan shell comprises a first shell for containing the motor and a second shell for containing the impeller, and the first shell and the second shell are fixedly connected up and down and are communicated with each other;

two relative air outlets are opened to the one end that first shell is kept away from the second shell, each air outlet is formed by an outward sloping incision, the incision includes two oblique sides and a base, each oblique side with the contained angle A between the axial of first shell is 0 ~ 45 degrees, the circumference span of incision base is 135 ~ 165 degrees, each air outlet's height is H1, the top of air outlet to the height of first shell bottom is H2, and the ratio between H1 and the H2 is 20/77.3 ~ 46/77.3.

2. The fan according to claim 1, wherein the oblique side edge or the extension line of the oblique side edge of each air outlet and the base edge or the extension line of the base edge of each air outlet intersect at a first point and a second point, the first points of the two air outlets are adjacently arranged, and an included angle B between a line connecting the center of the first housing and the first points of the two air outlets is 15-45 degrees in a radial plane passing through the base edges of the air outlets.

3. The fan as claimed in claim 2 wherein the included angle B is 45 degrees and the ratio between H1 and H2 is 43/73.

4. The fan of claim 1 wherein the first housing is a hollow cylinder and an end cap is affixed to an end of the cylinder distal from the second housing.

5. The blower of claim 4 wherein the end cap defines a boss, the boss defining a through hole therein for receiving a bearing.

6. The blower of claim 1, wherein the second housing comprises an annular wall flanged to the first housing at one end and a bottom cover at the other end.

7. The fan as claimed in claim 6, wherein an air inlet is formed at a central position of the bottom cover.

8. Hand dryer, characterized in that it comprises a fan according to any of claims 1-7.

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