JPH02277996A - Once through blower - Google Patents

Abstract

PURPOSE:To reduce noise and to improve the aerodynamic characteristic by forming a zone with a uniform flow passage cross section at a blade rear edge side of an inter-blade flow passage bounded adjoining blades. CONSTITUTION:In an once through blower in which an impeller 10 is constituted by mounting a plurality of blades 1 between side plates 2, a zone S with a uniform flow passage cross section is formed at a blade rear edge side of an inter-blade flow passage 11 bounded by the adjoining blades 1. Thus, flow between the blades is stabilized, separation of flow is reduced and effective flow passage area is expanded. Thus, aerodynamic characteristic is improved and noise is reduced.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a once-through fan suitable for an air conditioner.

(Prior Art) An example of a conventional cross-flow fan of this type is shown in FIGS. 5 and 6.

In Figures 5 and 6, 1 is a blade, 2 is a side plate, 3 is a support ring, 4 is a rotating shaft, 5 is a bearing, 6 is a motor, 7 is a casing, 8 is a stabilizer, and 9 is a discharge air path. .

Both ends of the wing 1 are fixed to a side plate 2, and the middle part thereof is supported by a plurality of support rings 3 arranged at predetermined intervals in the axial direction. Further, these blades 1 are arranged at equal intervals along the circumferential direction, and the inter-blade flow path 11 defined by adjacent blades 1 is configured to gradually decrease from the inlet to the outlet. .

A rotating shaft 4 fixed to the side plate 2 and extending in the axial direction is rotatably supported by the casing 7 via a bearing 5, and one rotating shaft 4 is interlocked with a mokuro.

Therefore, when the motor 6 is driven, the rotating shaft 4, the side plate 2,
The impeller 10 constituted by the blade 1 and the support ring 3 rotates in the direction shown by the white arrow in FIG.
While passing through the air, the air is energized and pressurized, and is blown out through the discharge air path 9.

(Problem to be solved by the invention) This type of once-through fan has a relatively large air volume and is quiet, so it is widely used for blowing out conditioned air. Improvement was expected.

(Means for Solving the Problems) The present invention was invented to solve the above problems, and the gist thereof is to construct a vane+R wheel by attaching a large number of wings to the side panels. (1) A one-flow blower characterized in that a region having a constant cross-sectional area of the flow path is formed on the trailing edge side of the blade in the inter-blade flow path bounded by the adjacent blades.

(Function) In the present invention, since the above configuration is provided, the flow between the blades is stabilized and flow separation is reduced, so the effective flow path area is expanded, and thus the aerodynamic characteristics are improved and noise is reduced at the same time. do.

(Example) One embodiment of the invention is shown in FIGS. 1 and 2.

A region S with a constant cross-sectional area of the flow path is formed on the blade trailing edge side of the large flow path 11 that is limited by the adjacent H1.

The chord length of this 1 is e, the cross-sectional area of the flow passage between blades is a, and the flow passage between M
When the distance from the entrance of No. 1 to the measurement point is χ, a/p
The relationship between
It remains almost constant over /3.

The other configurations are the same as the conventional ones shown in the 5th edition and in FIG.

Note that the song '1LpAB in FIG. 2 shows an example of a conventional once-through blower.

Therefore, the specific parking sound K PAS(d
The relationship between [1(A)) and the flow coefficient ψI-D2 is the third
It is shown by curve A in the figure, and as is clear from comparing it with that of the conventional one (curve B), the larger the flow coefficient, the smaller the specific noise. Moreover, the pressure coefficient ψ of the once-through blower of the present invention
The relationship between S and the flow coefficient φL (12) is shown by curve &IA in Figure 4, and if you compare it with the conventional one (curve B), it is clear that the pressure coefficient has improved over the entire flow range. There is.

(Effects of the Invention) In the present invention, since a region with a constant cross-sectional area of the flow path is formed on the trailing edge side of the blade-to-blade flow path that is limited by adjacent blades, the flow between the blades is stabilized and flow separation is reduced. This increases the effective flow path area, thus improving aerodynamic properties and reducing noise at the same time.

[Brief explanation of drawings]

FIGS. 1 and 2 show one embodiment of the present invention, in which No. 10 is a sectional view showing a flow path between blades, and FIG. 2 is a diagram showing changes in the cross-sectional area of the flow path. Fig. 3 is a diagram showing noise characteristics, Fig. 4 is a diagram showing aerodynamic characteristics, Fig. 5 is a partial longitudinal cross-sectional view of a conventional mass flow blower, and Fig. 6 is the Vl-Vl line in Fig. 5. FIG.

Claims (1)

[Claims] A once-through blower comprising a number of blades attached between side plates to form an impeller, characterized in that a region with a constant cross-sectional area of the flow path is formed on the trailing edge side of the blade of the flow path between the blades, which is limited by the adjacent blades. Once-through blower.