JPS58108947A - Current collecting ring unit for rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce the size and to enhance the efficiency of a rotary electric machine by providing a both-side suction type centrifugal fan on the same shaft as two slip rings at the intermediate of the slip rings. CONSTITUTION:A both-side suction type centrifugal fan 8a is provided at the intermediate position of slip rings 6, 6' of a current collecting ring shaft 4a. Cooling air which is sucked from the exterior is fed through a ventilation passage 10a, is partly passed from the side faces of slip rings 6, 6' through the ventilation hole, is sucked from one side suction port of a both-side suction type centrifugal fan 8a, is then discharged circumferntially, and is then exhausted out of a room. The cooling air of the other part is fed from the passage 10a, the side face of the slip ring 6' and the ventilation hole, is sucked from the other side suction port of the fan 8a, is discharged circumferentially, and is then discharged out of the room.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current collecting ring device for a large-capacity rotating electric machine, and particularly to a cooling structure.

If the slip ring is not used as a current collector ring device for a large-capacity rotating electrical machine, the slip ring generates heat due to the application of the rotor current of the rotating electrical machine and friction with the electric brush, resulting in an extremely high temperature rise.

For this reason, it is necessary to actively cool the slip ring by providing ventilation. A ventilation cooling structure in a current collector ring device according to the prior art will be explained with reference to FIG.

The current collector ring device shown in FIG. 1 has a structure that is separate from the main body of a conventional rotating electric machine. Reference numeral 1 denotes a current collector ring cover, and the current collector ring device is housed in this chamber. The current collecting ring shaft 4 is connected to the main rotating shaft 2 of the rotating electric machine body through a coupling 3, and the other end is supported pivotally on a bearing stand 5. Slip rings 6I are insulated and installed at intervals on this current collecting ring shaft 4, and the slip ring lead 7.7+ derived from the slip ring 6.61 is from the middle of the slip ring 6.6I. It passes through the hollow part of the current collection ring shaft 4 and is further connected to the rotor winding part through the hollow part of the main rotating shaft 2. A single suction type centrifugal fan 8 is attached to the current collecting ring shaft 4 at a position between the slip ring 6I and the bearing stand 5. 9 is the intake hole filter.

1O is a ventilation passage, and 11 is a foundation. When this current collector ring device is operated, the current from the rotor winding described above passes through the slip ring lead 7#7e to the slip ring 6.6I.
The electric current passes through an electric brush (not shown) and is taken out to the outside. At this time, the slip rings 6 and 61 generate heat from the electric current, and the electric brush generates heat due to friction with the slip ring 6.6I. Cooling air sucked in from the outside by the rotation of the single-side suction type centrifugal fan 8 flows through the ventilation path 1O in the direction of the solid arrow, and flows over the surface of the slip ring 6.61 for cooling.

The cooling air that took away the heat from the slip ring 6.6I is only one t.
The air is sucked in from the side suction port of the twin fan, discharged in the circumferential direction, and exhausted to the outside. Such a draft cooling structure has the following disadvantages.

Namely: 1) In the structure of the conventional single-side suction type fan, the fan must be installed so that the curvature is in series with the slip ring in the axial direction. The ventilation path also becomes longer and more complex, increasing ventilation resistance. Therefore, the fan itself had to be made larger. This resulted in an increase in the size of the current collector ring device and an increase in power consumption due to the operation of the fan, reducing the efficiency of the rotating electric machine.

2) The downstream slip ring 61 of the cooling air has a lip on which conductive powder caused by abrasion of the electric brush generated in the upstream slip ring 6 is crawled and adhered, and compared to the upstream slip ring 6, it has a lip. The point is that the insulation resistance decreases faster.

The object of the present invention is to eliminate the above-mentioned drawbacks, downsize the current collector ring device, and increase the efficiency of the rotating electric machine.

According to the present invention, in order to achieve the above object, the structure of the current collecting ring device is as follows.

In other words, in a system in which two slip rings attached to the shaft of a rotating electrical machine are ventilated and cooled by a fan coaxial with the slip rings, a double-suction type centrifugal fan is installed coaxially with the slip rings in the middle of the slip ring 211f. The structure is such that air is sucked in from the side of each slip ring for ventilation cooling.

Next, the structure of a current collecting ring device for a rotating electric machine, which is an embodiment of the present invention, will be described with reference to the drawings. FIG. 2 is a longitudinal sectional view of a current collecting ring device for a rotating electric machine according to an embodiment of the present invention, in which the same parts as those shown in No. 11EI are given the same reference numerals. Further, the details of portion P in FIG. 2 are shown in FIG. 3 as a longitudinal sectional view. The most improved part of the embodiment of this invention is the use of a double suction type centrifugal fan,
This is the location where it is installed. In other words, in FIG.
It is equipped with 7 and 8a. In this structure, the cooling air taken in from the outside passes through the ventilation passage lon, and a portion of the cooling air flows through the sides of the slip lint and 61 through the ventilation holes 12 and 13.
and 12'*131 (Fig. 3), is sucked in from the suction port on one side of the double suction type centrifugal tube 77 m, is discharged in the circumferential direction, and then discharged outside. In addition, some other cooling air flows from the ventilation passage 10a to the slip ring 6I.
It passes through the ventilation hole 12ζ13' (FIG. 3) from the side surface of the fan, is sucked in from the suction port on the other side of the dual suction type centrifugal fan 8m, is discharged in the circumferential direction, and is then discharged to the outside.

Cooling air is used to cool the slip ring 6.6' through the ventilation hole ILI.
! '11311'3I will be passed through. In this structure, since the fan 8a is installed in the middle of the slip rings 6.6°1, that is, at the slip ring lead L7I11, there is no need to increase the distance between the slip rings 6.61. Rather, the ventilation path 10m is simplified and shortened in the axial direction, the current collection ring shaft 4m is also shortened, and the current collection ring device can also be shortened in the axial direction. In other words, this invention has the following effects compared to the conventional structure: 1. The ventilation path is simplified and shortened, reducing ventilation resistance. I7 An 1 cotton size can be made smaller.

2. Therefore, the efficiency of the rotating electrical machine can be improved, the rotating electrical machine can be made smaller, and costs can be reduced.

3. The reduction in insulation resistance caused by electric brush powder can be alleviated.

There is an advantage that

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a current collector ring device for a rotating electrical machine with a conventional structure.
FIG. 2 is a longitudinal sectional view of a current collecting ring device for a rotating electrical machine which is an embodiment of the present invention, and FIG. 713 is an lIMN diagram showing details of section P in FIG. 2. 4.4aH current collector ring shaft, 5; bearing stand, 6+6'; slip ring %7#71; slip ring ν grease, 8a; double suction type centrifugal fan, 9; intake hole filter, lQ, lo
a; Ventilation duct.

Claims (1)

[Claims] l) Two slip rings attached to the shaft of a rotating electric bridge are cooled by ventilation using a fan coaxially attached to the slip rings, and a double suction is installed between the two slip rings coaxially with the slip ring. 1. A current collector ring device for a rotating electrical machine, characterized by having a structure in which a centrifugal fan is provided to suck in air from the side surface of each slip ring to perform excessive wind cooling.