JPS61266047A - Rotary electric machine having outer fan - Google Patents

Abstract

PURPOSE:To improve the cooling property of a rotary electric machine by forming a cutout at the housing side of a fan cover, and opposing the cutout and the terminal box of the housing outside through a gap. CONSTITUTION:The housing 1 of a full-sealed outer fan type rotary electric machine has a heat sink fin 3 on the outside, and a terminal box 2 secured thereto. A fan 5 secured to the rotational shaft projected from the end of the housing 1 is coated with a fan cover 6. this cover 6 has a cutout 8 at the side opposed to the housing 1, and a gap 9 formed between the bottom 8A and the box 2. As a result, cooling air generated by the fan 5 is fed between fins 3. In this case, the cooling air fed between the fins 3 is exhausted externally from the gap 9 before or after colliding with the box 2, and does not reversely flow to an inlet 3C. Accordingly, the air is flowed uniformly between the fins formed on the entire periphery, thereby effectively cooling the fins.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating electrical machine having an external fan, and relates to a C, #fK fully enclosed external fan-shaped rotating electrical machine.

[Background of the invention]

A conventional fully enclosed external fan-shaped rotating electric machine is shown in FIG.

Here, the housing 1 has a stator (not shown) inside and has cooling fins 8 extending outward in the axial direction, to which the terminal box 2 is fixed. A fan 5 is fixed to one end of the rotating shaft 4. The fan 5 has its outer periphery 5A and side surfaces 5B covered with a fan cover 6. The fan cover 6 has an air intake port on the front surface 6A for introducing cooling air), and the other end of the cylindrical shape covers the radiation fins 3 of the housing 1 and has an exhaust port 6B.

When the fan 5 rotates during operation of the totally enclosed external fan-shaped rotating electric machine constructed in this manner, cooling air flows as shown by the arrow in the figure due to the action of the fan 5.

Here, it is desirable that the cooling air uniformly flow between the radiation fins 8 to a position on the opposite side of the fan 50 of the housing I.

However, the terminal box 2 provided outside the housing 1 naturally obstructs the flow of cooling air. In other words,
The cooling air that has collided with the terminal box 2 or the mounting seat pressure of the terminal box 2 flows backward, and the cooling air inlet portion 3C of the radiation fin 3 obstructs the flow to the passage 3A between the other radiation fins 8.

Therefore, the passage 8 AVi terminal box 2 between the radiation fins 3
Even though the passage 3B is not blocked by the terminal box 2, the amount of cooling air is small due to the effect of the passage 3B being blocked by the terminal box 2. In addition, even in one passage 3B, the cooling air stagnates when it is returned in a normal manner, making it impossible to obtain a sufficient effective cooling effect.

[Purpose of the invention]

In view of the above-mentioned drawbacks, the present invention provides a 7-uncover for a completely enclosed external fan-shaped rotating electrical machine with good cooling performance.

(Summary of the Invention) The image of the present invention consists of a housing having a terminal box on the outside, a rotating shaft extending outward through a bracket located at the end of the housing, and a fan fixed to the rotating shaft. In a rotating electric machine having an outer fan having a fan cover that covers the outer periphery and sides of the fan, a notch is provided on the side facing the fan cover, and a gap is formed between the notch and the terminal box. The reason is that they are facing each other.

Therefore, the cooling air is discharged outward from the gap between the notch and the terminal box, so that the ventilation effect between the radiation fins is improved, and the ventilation between other radiation fins is also improved.

[Embodiments of the invention]

An embodiment of the present invention will be explained based on FIGS. 1 and 2.

Here, the parts indicated by the same reference numerals as in FIG. 5 are the same members, so the explanation will be omitted. The fan cover 6 has a notch 8 on the side facing the housing 1. This notch 8
is located on the side opposite to terminal-2, and this bottom surface 8A
A gap 9 is provided between the terminal box 2 and the terminal box 2.

In the rotating electric machine having such a configuration, the operation will be explained next. When the fan 5 is driven during operation, cooling air is sucked into the interior of the fan cover 6 through the intake hole. Next, this cooling air is No Ujing 1
It is sent between the heat dissipation fins 8 provided on the outer periphery of the radiator. Therefore, in the passage 3B of the radiation fins 3 on the side facing the terminal box 2, the cooling air that has entered between these radiation fins 3 is discharged from the terminal box 2.
Before or after the collision, it is ejected to the outside through the gap 9.

Therefore, since the cooling air does not flow backward at the cooling air inlet portion 3C of the radiation fins 3, the cooling air flows uniformly between the radiation fins 8 provided around the entire circumference. Therefore, the radiation fins 3 are effectively cooled by the cooling air, so that the cooling performance of the single-rotation room unit is improved. Furthermore, the cooling air does not stagnate between the terminal box 2 and the radiation fins 3 facing each other, but flows outward, so that the cooling performance is improved. Furthermore, even if the two terminal box external conductor lead-in openings 10 are fixed to the housing 1 so as to face the fan cover 6, the notch 8 provided in the fan cover 6 will not obstruct the work of pulling in the external conductors. do not have.

Another embodiment of the present invention includes a trap as shown in FIG. 8 and FIG.
The fan cover 6 is provided with a notch 8, and the terminal box 2 is inserted into the notch 8 through a gap 9.

With such a configuration, the terminal box 2 can prevent foreign matter from entering the fan 5 from the notch 8, which has the effect of further increasing safety.

It should be noted that the present invention is not limited to a rotating electric machine having seven lunges, and it goes without saying that the nozzle 1 may be attached to a horizontal fully-enclosed fan-shaped machine with a foot.

〔Effect of the invention〕

As explained above, in the present invention, a notch is provided on the side of the fan cover that faces the housing, and this notch and the terminal box are arranged to face each other with a gap between them, so that the cooling air flows through the terminal box. It can flow well between the heat dissipation fins on the side where it is located, and can also flow uniformly between the heat dissipation fins.

Therefore, there is an effect of improving the cooling performance of the rotating electric machine.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a side view of Fig. @1, Fig. 3 is a front view of a rotating electrical machine showing another embodiment of the invention, Fig. 1 is a FIG. 5 is a side view of the figure, and FIG. 5 is a front view of a conventional rotating electric machine. 1 is the housing, 2 is the terminal box, and 3 is the radiation fin. 4 is a rotating shaft, 5 is a fan, 6 is a 7-uncover, 7 is a bracket, 8 is a notch, 9 is a gap, and 5A-5B are the outer periphery and side surfaces of the fan, respectively. $1 Figure 弗.

Claims (1)

[Claims] 1. A housing having a terminal box on the outside, a bracket located at the end of this housing, a rotating shaft passing through this bracket and extending outward, a fan fixed to this rotating shaft, and In a rotating electric machine having a fan cover that covers the outer periphery and side surfaces of the fan, the fan cover has a notch on the side facing the housing, and the notch and the terminal box have a gap. A rotating electric machine having external fans that are opposite to each other. 2. The rotating electric machine having an external fan according to claim 1, wherein the terminal box is inserted into the notch.