JPH03229992A - Cross flow air blower - Google Patents

Abstract

PURPOSE:To reduce noise while maintaining high efficiency of an air blower by keeping clearance between the tip of a tongue part of a stabilizer and an outer periphery of a cross slow fan constant, and using a through porous structure member at the tongue part of the stabilizer. CONSTITUTION:A single body 3 of impeller consisting of a plural number of blend 1 and an end plate which supports and fixes each blend 1 is mounted at the center. Air passage is formed around it by a rear guide 4 and a stabilizer 5. Clearance between the tip of a tongue part of the stabilizer 5 and an outer periphery of a cross slow fan is kept constant. A through porous structure member is used at least in a part of the tongue part of the stabilizer 5. It is possible to create irregularity of air which flows among particles which form porous material, disperse air flow, and suppress delicate fluctuation of pressure. Thus, it is possible to reduce noise without deteriorating air feed performance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cross-flow blower device installed in an air conditioner or the like.

Prior Art Structure of a conventional cross-flow blower device
As shown in Japanese Patent No. 41696, it has a configuration as shown in FIG. In other words, an impeller unit 13 consisting of a plurality of blends 11 and support end plates 12 that support and fix each blend 11 is placed in the center, and around it an air flow path is formed by a rear guider 14 and a stabilizer 15. 16 and an air outlet 17. In other embodiments, for example, as shown in Japanese Patent Application Laid-open No. 14020/1983, as shown in FIGS. 6 and 7. The structure is as follows. In other words, the tongue ridge line of the stabilizer 15 is fixed so that the tip of the tongue of the stabilizer 15 continuously changes on a circumference concentric with the rotation axis of the cross flow fan within the length range of the impeller; and the rotation axis of the cross flow fan. The tongue ridges are parallel to each other, and the length of each ridge line is 115 or more of the total length of the impeller alone, and does not exceed the total length. Problems to be solved by the invention with a cross-flow blower device with defined lines However, the former cross-flow blower device with the configuration of the conventional example (mainly problems such as high noise and low efficiency compared to other blower devices) The noise generated in the vicinity of the stabilizer 15 is the loudest singular sound caused by the fan, and it has become necessary to suppress its generation. The number Z of blends 11 in 13 and the number of revolutions per minute n (r, p,
It is expressed by the following equation using the product of m) and its multiple k, and is usually called blade pitch sound.

bυ In general, the number of Blend 11 blades is large.Furthermore, the higher the rotation speed per minute, the higher the frequency of the blade pitch sound, which often occurs in the frequency band that is easiest to hear within the audible range. Therefore, it has become necessary to take measures to reduce this.
Vortices are generated and the behavior of these vortices has a large effect on air blowing performance.

The surface of the tongue that faces the fan may change irregularly in the longitudinal direction into an uneven shape. There is a risk that the air volume, pressure characteristics, and efficiency will decrease, which poses a problem.The present invention (in view of the above-mentioned conventional problems) provides a cross-flow blower device that produces extremely low noise while maintaining high blower efficiency. It is something.

Means for Solving the Problems In order to solve the above problems, the cross-flow blower device of the present invention
& a cross-flow fan formed by combining a plurality of individual impellers each having a plurality of blends each having a certain length arranged in a cylindrical shape in the direction of a rotating shaft; a motor that connects one end of the cross-flow fan and drives the rotation; a rear guider that supports and fixes the other end of the crossflow fan and the motor and forms a part of the flow path; The outlet is configured with a stabilizer having a tongue at a position close to and facing the cross-flow fan, and the plate is arranged so that the gap between the tip of the stabilizer tongue and the outer periphery of the cross-flow fan is constant. This cross-flow blower is characterized in that at least a portion thereof is made of a penetrating porous structural material.

As another means, there is also a cross-flow blowing device in which at least a portion of the stabilizer tongue is made of a non-penetrating porous structure material instead of a penetrating porous structure material.

Effects of the present invention (by adjusting the timing and overlap of the blade and pitch sounds of each individual impeller), by using a porous material in the tongue of the stabilizer, we create irregularities in the air flowing between the particles and disperse it. It is also possible to suppress subtle pressure fluctuations.These impeller pitch sounds with different timing interfere with each other (input and cancel each other out, making it audible and indistinguishable from other fluid noises. The noise level can be significantly reduced.However, the shape of the stabilizer itself remains unchanged.Noise reduction can be achieved without degrading the air blowing performance.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, the stabilizer 5 is provided so that the tip of the tongue is located on a concentric circle spaced apart from the center of the impeller 3 by a gap S, and a part or all of the tongue of this stabilizer is penetrated. It has a porous structure. Figure 2 is an enlarged view of part A, showing the flow of air near the tongue (above). To explain this in detail, the flow flows between the particles forming the porous material.
The flow is becoming irregular. This is because when molding porous materials, the pitch between the particles is unequal and they are arranged.Also, a similar effect occurs even if particles of different sizes and shapes are blended and molded. By making the flow irregular between the fan blades and the stabilizer in this way, the blade pitch noise is reduced.In addition, the penetrating porous material makes use of the slight inflow and outflow of air to create a thin It also has the effect of stabilizing the behavior and suppressing pressure fluctuations. Fig. 4 tQ shows a comparative frequency analysis between the conventional example and the product of the present invention. As shown in the figure, it is possible to reduce the nz sound, which is the single blade pitch sound. In another embodiment, a porous material is used in the tongue of the stabilizer on the side facing the fan.

The opposite side is constructed with a non-penetrating porous structure using a general resin material, as shown in FIG. In this structure,
The structure allows for two-color molding of porous material and general resin material, and also increases the strength of the stabilizer.

A similar effect can be obtained regarding the blade pitch sound.

Effects of the Invention E. By using a porous material for at least a portion of the tongue of the stabilizer, it is possible to reduce blade pitch noise that is unpleasant to the ear, and to provide a quiet air conditioning blower. At the same time, it will be possible to significantly improve efficiency, which has been limited by noise reduction.

[Brief explanation of drawings]

Fig. 1 is a cross-section of a main part of a cross-flow blower according to an embodiment of the present invention; Fig. 2 is a schematic diagram of the same; Fig. 3 is a cross-section of a main part showing another embodiment; Fig. 4(a). (b) is a comparative frequency analysis model; FIGS. 5 and 6 are partially cutaway perspective views of conventional examples; and FIG. 7 is a cross-sectional view of the same essential parts.

Claims (1)

[Claims] (1) A cross-flow fan formed by combining a plurality of single impellers each having a plurality of blends each having a certain length arranged in a cylindrical shape in the direction of the rotation axis, and a motor that connects one end of the cross-flow fan and drives the rotation. , a rear guider that supports and fixes the other end of the cross-flow fan and the motor and forms a part of the flow path; and a rear guider that is located near the downstream front surface of the cross-flow fan and forms another part of the flow path; and a stabilizer that constitutes an air outlet together with the rear guider and has a tongue at a position close to and opposite to the cross-flow fan, maintaining a constant gap between the tip of the stabilizer tongue and the outer periphery of the cross-flow fan, and . A cross-flow blower device, wherein at least a portion of the stabilizer tongue portion is made of a penetrating porous structural material. (2) The cross-flow blower device according to claim 1, wherein the stabilizer tongue is made of a non-penetrating porous structural material instead of the penetrating porous structural material.