JPS585412Y2 - rotating electric machine - Google Patents

Description

[Detailed explanation of the idea] This invention relates to cooling of a rotating electric machine with ventilation on both sides.

Conventionally, in rotating electric machines that adopt so-called double-sided ventilation in which cooling air is sent from both sides of the iron core in the axial direction, when installing an air cooler, two or more air coolers are installed due to the capacity of the cooler and space. ,,,The entire rotating electric machine was covered with a cover to form a ventilation path.

In this case, the price of the air cooler is higher than that of a single unit with the same capacity, and the disadvantage is that the overall size of the electric machine becomes larger due to the installation of multiple coolers and the cover for forming the cooling ventilation path. there were.

Also, for example, the external appearance of an open drip-proof rotating electric machine that does not require an air cooler and a completely enclosed internally cooled rotating electric machine is significantly different.
Each had to be designed separately.

Therefore, the purpose of this invention is to eliminate the drawbacks of the conventional type and to make it possible to achieve fully enclosed internal cooling with ventilation on both sides simply by installing a separately created cooling ventilation box in the basically designed open drip-proof rotating electric machine. shall be.

Next, to explain in detail with the drawings, FIGS. 1 and 2 show vertical cross-sectional views of a conventional rotating electric machine, in which rotation of a shaft 3 supporting a rotor 2 disposed inside a stator 1 is shown. Ventilation cylinders 4 are provided at both ends of the child.

In the case of an open-type electric machine, the air introduced from both sides by the ventilation shell 4 is discharged from the axial center of the machine after cooling the rotor and stator, but in the case of a completely enclosed type electric machine, the air is further fixed. It is cooled by coolers 6 on both sides attached to the child frame 5, and then guided to the ventilation shell again.

For this reason, in the case of a fully enclosed electric machine, the outer frame 7 of the rotating electric machine that forms the cooling ventilation passage becomes large.

In order to eliminate such conventional drawbacks, the present invention is constructed as shown in FIG. 3 and subsequent figures.

3A and 3S show a rotating electric machine 9 having an outer frame 21 on which a cooling ventilation box 8 according to the present invention is mounted.

The length of the cooling ventilation box 8 in the axial direction is approximately equal to the outer frame 21 of the rotating electric machine.

The air cooler 10 provided at one end of the cooling ventilation box 8 includes a relatively small number of air cooling pipes to which cooling water is supplied, for example, from the arrow side in Figure 3.

Note that this cooling pipe has a length substantially equal to the axial length of the electric machine outer frame 21.

Further, FIGS. 4A and 4S show an example in which a cooling ventilation box 8 is disposed in contact with the side of the rotating electric machine 11.

In this case, an outer frame 22 is used on the right or left side of the rotating electric machine 11, which is provided with an exhaust opening at the center, intake openings at both ends, and mounting means for mounting the cooling ventilation box 8 in contact therewith.

That is, depending on the installation location of the rotating electric machine 11, the cooling ventilation box can be attached to either the right side or the left side.

The interior of the cooling ventilation box 8 is shown in detail in FIGS. 5 and 6.

A heated air inlet 13 facing an exhaust port provided in the center of the electric machine is provided at the axial center of the bottom plate 12 of the cooling ventilation box 8, and a heated air inlet 13 facing the exhaust port provided at the center of the electric machine is provided at both ends of the outer frame 21 of the rotating electric machine in the axial direction. A cooling air outlet 14 is provided facing the intake port provided in the electric machine, and is arranged in contact with the outer frame of the electric machine.

The air led through the heated air inlet 13 rises and is introduced into the air cooler 10 provided on the other side and having a length approximately equal to the axial length of the outer frame 21 of the rotating electric machine, where it is cooled. The air cooler 10 is configured to be guided into the rotating electric machine through cooling air exhaust ports 14 at both ends in the longitudinal direction.

For this reason, two inverted triangular shielding plates 15 are attached in the axial direction to the lower end of the other side of the air cooler 10, which is arranged offset to one side of the cooling ventilation box 8.
Each outer side 16 of is attached to a rectangular shielding plate 17 for blocking and isolating the heated air inlet 13 and the cooling air outlet 14 and for spreading the heated air to the full length in the longitudinal direction of the air cooler 10. and sealed.

That is, the double-speed shield plates 15 and 17 are shield plates that isolate the heated air inlet 13 and the cooling air outlet 14, and may be formed of an integral sheet metal material, or may be made of a sheet metal material different from that of the embodiment. It may also be in the shape of

Each inner side 18 of the shielding plate 15 is sealed with one end of a chevron-shaped shielding plate 19 provided below the air cooler 10.

Furthermore, the other end and lower end of the shielding plate 19 and the shielding plate 1
The other three sides of 7 are the bottom plate 12 and outer plate 2 of the cooling ventilation box 8.
0 each mounting is sealed.

The attachment may be done by any method such as adhesion, pressure bonding, welding, or fitting as a means of sealing.

When the cooling ventilation box 8 having the above configuration is mounted on a double-sided ventilation type rotating electric machine (having ventilation fans on both sides in the axial direction), the heated air heated inside the electric machine from the axial center of the machine flows as shown by the arrow in Fig. 5. As shown in , it rises upwards or along the shielding plate 17 to the full length in the longitudinal direction of the air cooler 10, or it rises upwards along the chevron-shaped shielding plate 19 and then bends almost at right angles. Proceeds in a direction perpendicular to the axis, then bends in the direction perpendicular to the axis, proceeds downward, is cooled by the air cooler 10, and then descends further downward or along the chevron-shaped shielding plate 19, and enters the rotating electricity through the cooling air outlet 14. be guided.

This cooled air cools the rotor and stator by a ventilation fan (see No. 4 in FIG. 1) attached to the rotor portion of the rotating electrical machine, and is led to the cooling ventilation box 8 again.

At this time, the air below the chevron-shaped shielding plate 19 is
As shown by the arrow in the figure, it takes a slight detour to reach the cooler 10.

Next, the functions and effects of this invention will be described.

According to the present invention, the length of the air cooling pipe provided in the air cooler can be increased in the axial direction compared to the conventional one.
The number of cooling pipes can at least increase the heat dissipation area of the cooling pipes.

Furthermore, according to the present invention, the heated air can be spread over the entire longitudinal length of the air cooler, making it possible to effectively utilize the heat dissipation area of the air cooler.

Therefore, it is possible to reduce the height and width dimensions of the air cooler.

In a cooling ventilation box equipped with an air cooler that has been reduced in size in this way, the air cooler is placed on one side as described above, and heated air is supplied to the entire longitudinal length of the air cooler. Since the ventilation passage is formed so as to expand and circulate, it is possible to fully demonstrate the cooling effect by expanding the heat dissipation area of the cooler, and to reduce the required volume of the cooling ventilation box to the necessary minimum. It can be done.

Therefore, by simply installing one cooling ventilation box like this, you can easily convert a standard open type rotating electric machine with double-sided ventilation to a fully enclosed internally cooled type rotating electric machine, which is not only extremely economical, but can also be made to meet your needs. Since the cooling ventilation box can be mounted above or on the side of the electric machine, there is an effect of increasing the degree of freedom in the mounting location of the rotating electric machine.

Also, even if a cooling ventilation box is attached to the outer frame of an electric machine like this,
Since the volume of the cooling ventilation box is minimized, the volume of the entire electric machine frame including the cooling section is significantly reduced compared to the conventional one.

Further, according to the present invention, the lower part of the air cooler 10 provided in the cooling ventilation box 8 does not directly open to the center of the electric machine, but instead has a chevron-shaped source shield plate 19 as a ventilation guide plate and an inverted triangular shield plate 15. Since the air cooler 1 is shielded by
There is no possibility that water droplets condensed on the electrical equipment will drip onto the live parts of the central part of the electrical equipment, so there is no need for any special structure for drip-proofing. It can be applied to electrical equipment, and the effect of further downsizing can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional rotating electric machine, Fig. 2 is a plan longitudinal cross-sectional view, Fig. 3a and Fig. 3 are a front view and a side view showing an embodiment of the present invention, and Fig. 4 FIG. 5 is a partially cutaway perspective view of the cooling ventilation box according to the present invention as seen from the other side, and FIG. 6 is a front view and a side view showing another embodiment. FIG. 3 is a perspective view of the cooling ventilation box. 1: stator, 2: rotor, 3: shaft, 4: ventilation layer, 8: cooling ventilation box, 10: air cooler, 12: bottom plate, 13: heated air inlet, 14: cooling air outlet, 15: Triangular shielding plate, 17: Rectangular shielding plate, 19: Yamagata source shielding plate, 20: Outer plate, 21.22: Outer frame.

Claims (1)

[Scope of utility model registration request] A stator, a rotor having ventilation cylinders on both sides in the axial direction, and an electric machine outer frame that supports the stator and rotor and has an exhaust port provided in the center in the axial direction and an intake port provided in both ends in the axial direction. A rotating electrical machine comprising: a bottom plate disposed in contact with the outer frame and having a heated air inlet facing the exhaust port provided in the outer frame and a cooling air outlet facing the intake port; an axis of the bottom plate; A chevron-shaped source shielding plate sealed on one side of the heated air inlet provided in the center of the direction, an air cooler disposed in the axial direction on the upper part of the chevron-shaped source shielding plate, and the other side of the air cooler. and the other end of the chevron-shaped source shield plate to isolate the heated air inlet and the cooling air outlet and to spread the heated air in the longitudinal direction of the air cooler; A rotating electric machine characterized in that a cooling ventilation box made of an outer plate that covers a shielding plate, an air cooler, and a bottom plate and is arranged in a sealed manner with each shielding plate to form a ventilation path is disposed in contact with the shielding plate.