JPH0512692U - Turbo Juan - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to improve the efficiency by relaxing the separation phenomenon of the air flowing on the blade surface of a turbofan to increase the air volume and static pressure. In a turbofan having a plurality of blades 6 arranged on a main plate 1, a plurality of circular concave surfaces 8 are formed at arbitrary positions on the front surface 7 of the blades 6. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a turbofan, and its purpose is to alleviate the separation phenomenon of the air flowing on the blade surface to increase the air volume and static pressure and improve the fan efficiency.

[0002]

[Prior art and problems]

 A conventional technique will be described with reference to FIGS. A conventional turbofan is provided with blades 2 formed on a main plate 1 with a constant arc surface. In the figure, e is the inside of the blade and f is the outside of the blade. Therefore, the air sucked from the suction port 3 flows through the passage 5 between the blades, but since the blade shape is an arc surface, the front surface 4 of the blade 2 is peeled off. Therefore, in the air flow indicated by the arrow U in FIG. 7, almost no air flows on the surface side of the blades, resulting in poor fan efficiency.

[0003]

[Means for Solving the Problems]

 The turbofan of the present invention is a turbofan in which a plurality of blades 6 are arranged on a main plate 1, and a plurality of circular concave surfaces 8 are formed at arbitrary positions on the front side 7 surface of the blades 6. It is characterized by having done.

[0004]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4, 1 is a main plate, 6 is a blade arranged on the main plate 1, and a passage 5 is formed between the suction port 3 and the blade. Further, as shown in FIGS. 2 to 4, a plurality of circular recessed surfaces 8 are formed at arbitrary points on the front surface 7 of the blade 6. In the figure, 9 indicated by an arrow indicates the rotation direction of the turbo fan. FIG. 6 shows another embodiment, in which a vertically long concave surface 10 is formed instead of the circular concave surface 8 shown in FIGS.

[0005]

[Action]

 Next, the operation of the present invention will be described. When the turbofan of the present invention is rotated, the air sucked from the suction port 3 is discharged from the outer periphery of the turbofan by the blades 6 and is blown. At this time, the flow of air on the front surface 7 side of the blade is disturbed by the circular concave surface 8 and mixed with the air flowing through the passage 5 to receive energy supplied to the front surface 7 surface of the front surface 7 to cause separation. Are alleviated to generate an air flow, and the air basin area of the passage 5 is increased.

As shown in FIG. 4, the range of the circular concave surface 8 formed on the blade 6 cannot be unconditionally determined because it varies depending on the fan shape. For example, when the circular concave surface 8 is formed in the range of 1 / L × 100 = 60% from the inner end e of the blade 6, its effect is exhibited, and the fan characteristic as shown in FIG. Was obtained. In this figure, the characteristic A shows the relationship between the air volume and the static pressure of the fan in the present invention, and the characteristic B shows the relationship between the air volume and the static pressure of the conventional fan. Although the concave shape of the blade used for the comparison of the fan characteristics is circular, the same result is obtained even when the concave shape is elongated.

[0007]

[Effect of the device]

 As described above, according to the present invention, since a plurality of concave surfaces 8 or 10 are formed at arbitrary positions on the front surface 7 surface of the blade 6, the air flow on the front surface 7 of the blade is disturbed. The air is mixed with the air flowing outside and flows to the discharge side. Therefore, compared with the conventional one, the effective passage area is increased, the air volume and the static pressure are increased, the fan efficiency can be improved, and the practical effect is great.

[0008]

[Brief description of drawings]

FIG. 1 is a plan view of a turbofan of the present invention.

FIG. 2 is a perspective view of the blade shown in FIG.

3 is a cross-sectional view taken along line CC of the blade shown in FIG.

FIG. 4 is a cross-sectional view taken along line CC of the blade shown in FIG.

FIG. 5 is a characteristic diagram showing a relationship between an air flow rate of a turbo fan and static pressure.

FIG. 6 is a perspective view of a blade according to another embodiment of the present invention.

FIG. 7 is a plan view of a conventional turbo fan.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a perspective view of a conventional blade.

[Explanation of symbols]

1 Main plate. 2 feathers. 3 Suction port.
4 Front side of the blade. 5 passages. 6 feathers.
7 Front side of the blade. 8 Circular concave surface. 9 Direction of rotation. 10 Vertically long concave surface. e Inside the blade.
f Outside of the blade.

Claims (1)

[Scope of utility model registration request] 1. A turbofan having a plurality of blades 6 arranged on a main plate 1, wherein a plurality of circular concave surfaces 8 are formed at arbitrary positions on a front surface 7 of the blades 6. Is a turbo fan.