JPH08261197A - Impeller for multiblade blower - Google Patents

Abstract

PURPOSE: To improve noise performance of a blower by reducing separation of a blow out flow generated in a negative pressure surface of a blade member when the blower is driven, and suppressing generation of a turbulent blow air sound, in an impeller for a multiblade blower using a rectangular blade member. CONSTITUTION: In an impeller for a multiblade blower formed by mounting many rectangular blade members 1 in the periphery of a disk-shaped partitioning plate 2, a sectional shape of the rectangular blade member 1 is formed of two curved surfaces 1a, 1b, further to form a connecting part 1c of the two curved surfaces bent in a chevron shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller for a multiblade blower used for air conditioners and the like.

[0002]

2. Description of the Related Art A multi-blade blower is installed and used in many air conditioners, and its impeller generally has a large number of rectangular blade members 11 and a circle of a plurality of disc-shaped partition plates 12. Although it is formed by being attached to the circumference, the cross-sectional shape of the conventional rectangular blade member 11 is formed in an arc shape as shown in FIG. 5, and is A ° for providing the performance suitable for the housing to be housed. Was formed so as to have a mounting angle of B ° and an exit angle of B °.

However, when the blower is driven, the conventional blade member 11 is on the curved surface on the positive pressure surface side of the outlet with respect to the main flow a'which is blown out through the blade member 11 when the blower is driven, as shown in FIG. The flow b'follows, but the flow c'on the curved surface on the suction side cannot follow and causes separation d ', resulting in turbulent flow and turbulent noise. There was a problem of worsening.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional techniques, the present invention has been devised in the impeller for a multi-blade blower by devising the cross-sectional shape of the rectangular blade member so that the blowout flow when the blower is driven is improved. It is an object of the present invention to provide an impeller that can reduce the separation generated on the negative pressure surface of the blade member, suppress the generation of turbulent air flow noise, and improve the noise performance of the blower. is there.

[0005]

The structure of the impeller of the present invention made for the purpose of solving the above problems is a multi-blade formed by attaching a large number of rectangular blade members to the circumference of a disk-shaped partition plate. In an impeller of a blower, a rectangular blade member has a cross-sectional shape formed by two curved surfaces, and a connecting portion of the two curved surfaces is bent in a "V" shape.

[0006]

The blade member of the impeller of the present invention has a sectional shape of 2
It is formed by a curved surface, and the connecting portion of the two curved surfaces is "he".
Since it is bent into a letter shape, it is possible to reduce separation on the negative pressure surface of the blade member when the blower is driven,
Turbulent blast noise is suppressed and noise performance is improved.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.
1 is a front view of an impeller of an example of the present invention, FIG. 2 is a partially enlarged cross-sectional view of an impeller member used in the impeller of the present invention, and FIG. 3 is a state of blowout flow in a multiblade fan using the impeller of the present invention. FIG. 4 is a partial enlarged cross-sectional view showing the performance characteristics of a multiblade fan using the impeller of the present invention and a conventional multiblade fan.

In the drawing, 1 is a rectangular blade member, 2 is a disk-shaped partition plate, 3 is a shaft plate, 4 is a boss plate,
A large number of blade members 1 are mounted on the circumference of a plurality of disk-shaped partition plates 2, and shaft plates 3 and boss plates 4 are mounted on both sides thereof to form an impeller. In the present invention, however. Since the blade member 1 is devised to improve the noise performance when the blower is driven, the blade member 1 will be described in detail below.

That is, the blade member 1 according to the present invention has a rectangular shape similar to the conventional one, but is not an arc shape, and its cross-sectional shape is formed into two curved surfaces 1a and 1b, and The connecting portion 1c of the two curved surfaces 1a and 1b is bent into a "V" shape, and when mounted on the disc-shaped partition plate 2, the disc-shaped partition plate 2 is attached to the disc-shaped partition plate 2 in the same manner as the conventional blade member 11. Set the installation angle of A to A ° and the exit angle to B °.

By doing so, the state of the flow passing through the blade member 1 and blowing out when the blower is driven is shown in FIG.
As shown in, the flow b on the pressure side and the flow c on the pressure side of the curved surface 1b of the vane member 1 with respect to the flow of the main flow a
Are in a parallel state, and peeling d on the suction surface is less likely to occur. As a result, turbulence is less likely to occur, turbulence noise is reduced, and the noise performance of the blower can be improved.

Actually, the performance characteristics of a multiblade fan using the impeller of the present invention and a multiblade fan using a conventional impeller were compared, and the impeller of the present invention was used as shown in the chart of FIG. Compared with the conventional impeller, the multi-blade blower used
It was confirmed that noise was reduced by 1.5 dB to 2.5 dB with the same air volume.

[0012]

The present invention is as described above, and a blade is formed by using a rectangular blade member whose cross-sectional shape is formed by two curved surfaces, and the connecting portion of the two curved surfaces is bent in a "V" shape. By configuring the vehicle, it is possible to reduce the separation that occurs on the negative pressure surface of the blade member when the blower is driven, and it is possible to suppress the generation of turbulent noise due to the separation, thus improving the noise performance of the blower. Can be achieved.

[Brief description of drawings]

FIG. 1 is a front view of an impeller of an example of the present invention.

FIG. 2 is a partially enlarged sectional view of a blade member used in the impeller of the present invention.

FIG. 3 is a partially enlarged sectional view showing a state of blowout flow in a multiblade blower using the impeller of the present invention.

FIG. 4 is a chart comparing performance characteristics of a multiblade fan using the impeller of the present invention and a conventional multiblade fan.

FIG. 5 is a partially enlarged sectional view of a blade member used in a conventional multi-blade blower.

6 is a partially enlarged cross-sectional view showing a state of blowout flow in an impeller using the blade member of FIG.

[Explanation of symbols]

 1 Blade member 1a, 1b Curved surface 1c Joint part of both curved surfaces 2 Disc-shaped partition plate 3 Axial plate 4 Boss plate a Main flow of blow b Flow on positive pressure surface of blade member c Flow on negative pressure surface of blade member d Flow separation on the suction side of the blade member

Claims (1)

[Claims] 1. A multi-blade fan impeller formed by mounting a large number of rectangular blade members on the circumference of a disk-shaped partition plate, wherein the rectangular blade member has a cross-sectional shape formed by two curved surfaces.
An impeller for a multi-blade transmitter, characterized in that the connecting portion of the two curved surfaces is bent in a "V" shape.