JPH02179242A - Cooling mechanism of rotating electric machine - Google Patents

Abstract

PURPOSE:To reduce noises caused by air to be exhausted and to promote vane efficiency and cooling effect by providing wind guides between a radial fan and a casing and rectifying an air to be exhausted from the wind guides. CONSTITUTION:Wind guides 7 are fixed to a casing 3 so that it increases continuously in the revolving direction between the peripheral surface of a radial fan and the circumferential surface of the casing 3, and exhaust ports 4 of an air are made between two wind guides 7. When a rotating electric machine operates, a shaft 2 revolves, a blade 1a of the radial fan rotating with the rotating of the shaft, and the inside of the rotating electric machine is cooled. An air depriving heat occuring in the rotating electric machine through a stator and a rotor is guided by the wind guides 7 to pass through a path indicated by short dashed lines, and it is rectified by the wind guides 7 to exhaust from the exhaust ports 4 to the outside of the rotating electric machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling mechanism for a rotating electric machine.

[Conventional technology]

3 and 4 show a conventional cooling mechanism for a rotating electrical machine. Each is a sectional view taken along line m-■ in FIG.

In the IV-mV cross-sectional views of FIG. 3, reference numeral 1 in these figures is a radial fan, and a plurality of blades 1a are fixed to a shaft 2 radially outward in the radial direction. Further, 3 is a casing, 4 is a discharge port, 5 is a stator, and 6 is a rotor, each of which is provided at one position as shown in the figure.

In the following configuration 1, when the rotary electric machine is activated by a known action and the shaft 2 rotates, the radial fan top and its blades 1a also rotate, sucking outside air, The heat generated inside the rotating electric machine is removed through the stator 5 and rotor 6, and is discharged to the outside of the rotating electric machine through the exhaust port 4. The interior of the rotating electric machine is thus cooled.

[Problem that the invention seeks to solve]

However, the conventional cooling mechanism described above has a problem in that the air discharged from the outlet 4 is turbulent, and the discharged air generates a large amount of noise.

This invention was made to solve the above-mentioned problems, and its purpose is to reduce the noise generated by the exhausted air.

[Means for solving problems]

To achieve the above object, a rotary electric machine according to the present invention has a radial fan consisting of a plurality of blades fixed to the casing of the rotary electric machine and concentrically with a predetermined spacing in the radial direction to the shaft of the rotary electric machine. The cooling mechanism for the electric machine includes at least one wind guide disposed between the inner circumferential surface of the casing and the outer circumferential surface of the radial fan, the gap between the inner circumferential surface and the radial fan being , having a wind guide arranged so as to increase continuously in the direction of rotation of the radial fan, and having an air outlet between the largest part of the interval and the smallest part of the interval. It is.

Further, the above-mentioned wind guide is a single wind guide that is disposed over almost the entire circumference between the outer peripheral surface of the radial fan and the inner peripheral surface of the casing, and air is allowed to flow between one end and the other end of the wind guide. Alternatively, a plurality of wind guides may be arranged at equal intervals, and the space between adjacent ends may be used as an air outlet.

[Embodiment 1] An embodiment of a cooling mechanism for a rotating electrical machine according to the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 is a sectional view taken along line I-1 in Figure 2.
N cross-sectional views are shown, and in these figures, the same reference numerals as in FIG. 2 indicate the same configuration as in FIG. and the inner peripheral surface of the casing 3 at equal intervals with a predetermined interval,
Inside each one! Same wl with 4 sides and radial 77n1
llg is identified in the casing 3 so as to continuously increase in the direction of rotation of the radial fan 10,
An air outlet 4 is formed between these two wind guides 7.

In the above configuration, when the known rotary electric machine operates, the shaft 2 rotates, and the blades 1a of the radial fan 1 rotate accordingly.

As in the prior art described above, the interior of the rotating electrical machine is cooled. At this time, the air that has passed through the stator 5 and rotor 6 and has taken away the heat generated inside the rotating electric machine is guided to the wind guide 7, passes through the path shown by the broken line in FIG. 2, and is rectified by the wind guide 7. It is discharged from the discharge port 4 to the outside of the light electric machine.

In addition, in the above embodiment, two wind guides were provided, but one
Three wind guides may be provided over almost the entire circumference between the outer circumferential surface of the radial 77 and the inner circumferential surface of the casing 3, and a discharge port may be provided between one end and the other. The above wind guides may be arranged at predetermined intervals, and the spaces between adjacent ends may be used as exhaust ports.

[Effects of the Invention] As explained above, according to the present invention, a wind guide is provided between the radial fan and the casing, and the air discharged by the wind guide is rectified, so that the noise generated by the discharged air is reduced. It has the advantage that it is smaller than before. The rectification also has the advantage of increasing the blade efficiency of the radial fan and improving the cooling effect.

[Brief explanation of the drawing]

1 and 2 are sectional views taken along line 1-1 in FIG. 2, sectional views taken along line II-II in FIG. 1, and FIGS. 3 and 4 show conventional examples, respectively. l11- in Figure 4
FIG. 1 is a sectional view, and FIG. 3 is a sectional view taken along IV-IV in FIG. 1.1 Radial fan 1!1...Blade 2...Shaft 3...Casing 4...Discharge port a...Fist-style guide

Claims (1)

[Claims] 1. A rotary electric machine having a radial fan consisting of a plurality of blades concentrically fixed to the shaft of the rotary electric machine with a predetermined spacing in the radial direction from the casing of the rotary electric machine. In the cooling mechanism, at least one wind guide is disposed between an inner circumferential surface of the casing and an outer circumferential surface of the radial fan, the distance between the inner circumferential surface and the radial fan being equal to the distance between the inner circumferential surface and the radial fan. It has a wind guide arranged so as to increase continuously in the direction of rotation of the fan, and an air outlet is provided between the largest part of the interval and the smallest part of the interval. Features a cooling mechanism for rotating electric machines. 2. One wind guide is arranged along almost the entire circumference between the outer peripheral surface of the radial fan and the inner peripheral surface of the casing, and the space between one end and the other end serves as an air outlet. A cooling mechanism for a rotating electric machine according to claim 1. 3.Claim 1, wherein a plurality of wind guides are arranged at equal intervals, and an air outlet is provided between each adjacent end.
Cooling mechanism for the described rotating electrical machine.