JPS61157791A - Turbo-blower - Google Patents

Abstract

PURPOSE:To reduce the air flow noise by partitioning the annular wind path on the outercircumference of casing spirally with a partition board then fixing a tapered muffler member thereby forming a wind collecting section having gradually increasing cross-section in the direction of wind and a muffler section having constant cross-section. CONSTITUTION:An annular wind path 5 is provided on the outercircumference of casing 2 while surrounding a motor 4 and partitioned in spiral through a partition board 6 surrounding approximately entire outercircumference. A tapered muffler member 7 having gradually decreasing axial dimension is fixed to the end section of said partition board 6 to form a wind collecting section 5a having gradually increasing cross-section in the direction of wind and a muffler section 5b having constant cross-section and communicating with said section 5a. Consequently, the air flow noise can be reduced efficiently through compact structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a turbo blower that can reduce ventilation noise with a compact structure.

[Prior art and its problems]

Turbo blowers generally have a silencer installed in the middle of the ventilation piping to reduce ventilation noise, but this has the disadvantage that not only does it take up more space to install, but it also requires a lot of work.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a turbo blower that can reduce ventilation noise with a compact structure.

[Key points of the invention]

In order to achieve the above object, the present invention surrounds an impeller with a casing divided in the axial direction and a casing cover,
Attached to the casing, an annular air passage is provided on the outer periphery of the casing, surrounding the outer periphery of the supported drive motor, and this air passage is partitioned into a spiral shape by a partition plate that goes around the circumferential direction, and at the end of this partition plate. A tapered sound damping member whose axial dimension gradually decreases is attached to the section to form a wind collecting section whose cross-sectional area gradually increases in the direction of air flow and a sound damping section with a constant cross-sectional area that communicates with this section, and this damping ventilation noise is eliminated. This is something I tried to reduce.

[Embodiments of the invention]

FIG. 1 and FIG. 2 show an embodiment of this invention.
A turbo-type impeller 1 is surrounded by a casing 2 divided in the axial direction and a casing cover 8, and a drive motor 4 of the impeller 1
is attached to and supported by the casing 2. An annular air passage 5 is provided on the outer periphery of the casing 2 so as to surround the outer periphery of the motor 4 . As shown in FIG. 8, the air passage 5 is partitioned into a spiral shape by a partition plate 6 that goes around the circumferential direction, and has an axial dimension at the end of the partition plate 6, as shown in FIG. A tapered sound deadening member 7 whose diameter gradually decreases is attached to the road wall with an adhesive or the like, thereby forming a wind collecting part 5a whose cross-sectional area gradually increases in the air blowing direction and a sound deadening part 5b which communicates with the wind collecting part 5a and which has a constant cross-sectional area. It is formed. A partition wall 8 is provided between the terminal end of the partition plate 6 and the sound deadening member 7, and a discharge port 9 is provided in front of the partition wall 8. A suction port 3a is provided at the center of the cover 8.

According to the above embodiment, the wind accompanying the rotary wheel of the impeller 1 is combined at the wind collecting section 5a, passes through the silencing section 5b, and is discharged from the discharge port 9, and the ventilation noise can be absorbed and reduced by the silencing section 5b. I am now able to do it. The length of the sound muffling section 6b in the air blowing direction is approximately one circumference of the annular air blowing passage 5, and the sound absorbing area is large, so that the sound can be efficiently muffled. The cross-sectional area of the air passage 5 gradually increases or becomes constant depending on the air volume, and since there are no midpoints or sharp bends in the air passage 5, ventilation resistance is small, thereby preventing a decrease in blower efficiency.

Further, the sound deadening member 7 of the sound deadening part 5b can be easily formed by simply cutting one side of a material of a certain thickness diagonally, and by using this sound deadening member 7 and the spiral partition plate 6, the air duct 5 Since the axial dimension of can be made constant, the structure of the casing 2 can also be simplified. Furthermore, since the air passage 5 is provided on the outer peripheral side of the motor 4, a compact structure with good space efficiency can be achieved.

〔Effect of the invention〕

According to this invention, in a turbo blower, an annular air passage is provided in the outer periphery of the casing surrounding the impeller, surrounding the outer periphery of the drive motor, and the air passage is spirally connected with a partition plate that goes around the circumferential direction. At the same time, a tapered sound deadening member whose axial dimension gradually decreases is attached to the end of the partition plate to create a wind collection part whose cross-sectional area gradually increases in the air blowing direction and a sound deadening part with a constant cross-sectional area that communicates with it. As a result, ventilation noise can be effectively reduced with a compact structure.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a side view of FIG. The figure is a perspective view of the sound deadening member of FIGS. 1 and 8. DESCRIPTION OF SYMBOLS 1... Impeller, 2... Casing, 8... Cover, 4... Motor, 5... Air duct, 5a... Air collection part, 5b... Silence part, 6... - Partition plate, 7... Sound deadening member. Page 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1) In a blower in which a turbo-type impeller is surrounded by a casing divided in the axial direction and a casing cover, and a drive motor for the impeller is attached to and supported by the casing, an annular shape is provided on the outer periphery of the casing surrounding the outer periphery of the motor. A ventilation path is provided, and this ventilation path is partitioned into a spiral shape by a partition plate that goes around the circumference, and a tapered sound damping member whose axial dimension gradually decreases is attached to the end of this partition plate, so that the airflow direction is A turbo-type blower characterized by forming a wind collecting part with a gradually increasing cross-sectional area and a noise-reducing part with a constant cross-sectional area communicating with the wind collecting part.