JP2549052Y2 - Cross flow fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cross flow fan used for an air conditioner and the like, and more particularly, to a cross flow fan with improved ventilation performance.

(Prior art)

FIG. 4 shows an example of a conventional crossflow fan which is the background of the present invention. The cross flow fan 1 used for such an air conditioner or the like has a large number of blades 3 disposed between a pair of concentric annular plates 2 having a hollow inside as shown in FIG. It is a resin molded product using the same. Normally, as shown in FIG. 5, a plurality of the cross flow fans 1 are connected and used in the blade span direction as a single unit J.

[Problems to be solved by the invention]

In such a conventional cross-flow fan 1, the hollow end face 4 of the annular plate 2 on the side where the blade 3 is not disposed is shown on one side with respect to the fan center line 7 as shown in FIG. ), The edge was formed without any processing.

Therefore, as shown in FIG. 5, when a plurality of cross flow fans 1 are connected and used in the blade span direction, the rotation of the cross flow fan 1 causes the cross flow fan 1 to rotate from the outer peripheral side toward the inside thereof. When the wind supplied in parallel to the plate 2 passes through the hollow portion of the annular plate 2, its flow velocity distribution is disturbed by frictional resistance due to the edge of the hollow portion end face 4. Therefore, there is a problem that not only the flow velocity distribution becomes non-uniform and the air blowing performance is reduced, but also the total air volume is reduced.

Accordingly, it is an object of the present invention to provide a cross flow fan in which the flow velocity distribution is made uniform under the same air flow as in the past, thereby increasing the total air flow.

[Means for solving the problem]

In order to achieve the above object, the main means adopted in the present invention is a plurality of resin-molded cross flow fans in which a number of blades are arranged on one surface of a hollow concentric annular plate in the blade span direction. A cross-flow fan having a point that a chamfering is performed so that an end face of a hollow portion of the annular plate is asymmetrical.

[Action]

According to the present invention, the surface of the annular plate on which the blades are not disposed on the end surface of the hollow portion is chamfered more than the surface on which the blades are disposed. The frictional resistance at the end face of the hollow portion against the wind passing through the portion is reduced.

Therefore, the wind passing through the hollow portion of the annular plate is
It is possible to pass through the hollow portion of the annular plate without disturbing the flow velocity distribution at the end face of the hollow portion.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is an enlarged sectional view of a main part of a cross flow fan according to an embodiment of the present invention, and FIG. 2 is a diagram showing a case where the above cross flow fan is used and a case where a conventional cross flow fan is used. FIG. 3 is a correlation characteristic diagram showing the flow velocity distribution, and FIG. 3 is a correlation characteristic diagram between the air volume and the rotation speed.

In the following description, the same elements as those of the conventional crossflow fan 1 shown in FIG. 4 or FIG. The following embodiments are merely specific examples of the present invention, and do not limit the technical scope of the present invention.

This embodiment differs from the conventional crossflow fan 1 in that, as shown in FIG. 1, the blade 3 is provided at the hollow end face 5 on the side of the annular plate 2 where the blade 3 is not provided. The side that is not
Is that the chamfer has been made larger than that of the surface on which is disposed.

Next, the correlation characteristics of the flow velocity distribution between the cross flow fan 6 in which the hollow end face 5 is chamfered in an arc shape and the conventional cross flow fan 1 in which the hollow end face 4 is not processed at all are examined. The results are shown in FIG.

Here, 0 mm on the horizontal axis corresponds to the center X (the center of one crossflow fan J) of the annular plate serving as the reference shown in FIG. 5 and the upstream annular plate, and 35 mm means 55 mm corresponds to the center Z between the reference annular plate and one of the downstream annular plates.

According to this, when the crossflow fan 6 of the present embodiment is used as compared with the case where the conventional crossflow fan 1 is used, the distance between the both ends of the annular plate is about 10 mm.
% Of the flow velocity distribution was improved.

FIG. 3 shows the result of examining the correlation characteristics between the air flow rate and the rotation speed of the cross flow fan 6 of the present embodiment and the conventional cross flow fan 1. According to this, it was recognized that the air volume at the same rotation speed increased by about 3% when the cross flow fan 6 of the present embodiment was used.

From the above results, it was found that the frictional resistance at the hollow end face 5 was reduced by performing the arc-shaped chamfering on the hollow end face 5, and as a result, the flow velocity distribution was improved and the total air volume was increased.

Note that the chamfer is not limited to the arc shape, and C-chamfering is also possible if necessary.

[Effect of the invention]

According to the present invention, a plurality of resin-molded cross flow fans each having a plurality of blades arranged on one surface of a hollow concentric annular plate are connected in the blade span direction. The chamfering of the end of the hollow part is asymmetric, so that the turbulence of the flow velocity distribution of the wind passing through the cross flow fan is reduced, so that the air velocity can be made uniform and the total air volume can be increased. It can provide an excellent cross flow fan.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a cross flow fan according to an embodiment of the present invention, and FIG. 2 is a flow velocity distribution in a case where the cross flow fan is used and in a case where a conventional cross flow fan is used. FIG. 3 is a correlation characteristic diagram between the air flow rate and the number of revolutions, FIG. 4 is a schematic front view of a conventional cross flow fan which is a background of the present invention, and FIG. FIG. 6 is a schematic configuration diagram in the case where a complicated number of flow fans are connected in the blade span direction, and FIG.
It is sectional drawing in the -A arrow direction. [Description of Signs] 1 ... Cross-flow fan 2 ... Circular plate 3 ... Blade 4 ... Hollow end face 5 ... Hollow end face 6 ... Cross flow fan.

Claims (1)

(57) [Scope of request for utility model registration] 1. A method comprising connecting a plurality of resin-molded cross flow fans, each having a plurality of blades arranged on one surface of a hollow concentric annular plate, in the blade span direction. A cross-flow fan characterized by chamfering so that the end face of the hollow portion is asymmetric.