JPS6320102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical totally enclosed external sector rotating machine in which the air in a frame surrounding the rotor is cooled by outside air blown by a fan.

FIG. 1 is a partial cross-sectional view of a conventional vertical fully enclosed external sector rotating machine. In the figure, a spider 12 is fixed to the center of the rotating shaft 10, and a rotor 14 is attached to the outer circumference of the spider 12. This rotor 14 is covered by a stator frame 16 provided around the rotating shaft 10, and faces a stator 20 fixed to a reinforcing arm 18 inscribed in the stator frame 16. An outside air intake section 22 is formed in the upper part of the stator frame 16.

This outside air intake section 22 is connected to the stator frame 16.
A frame 24 integrally formed on the upper part of the rotary shaft 10 covers the upper end of the rotating shaft 10, and an inlet 26 is formed over the entire circumference of the circumferential side of the frame 24. The frame 24 is provided with a ventilation cover 28 around the air inlet 26 to prevent rain from entering through the air inlet 26, and an upper end bracket 30 is provided inside the frame 24 above the air inlet 26. An air intake guide plate 32 is attached to the lower part of the air intake port 26. The intake guide plate 32 is connected to the stator frame 1
6, the intake passage 33 is bent at the middle part, the tip side forms a horizontal part, and the rear end side (attachment side) is inclined downward toward the attachment part. The intake guide plate 32 has a tip portion that covers the peripheral edge of an external fan 34 fixed to the rotating shaft 10. This external fan 34 rotates integrally with the rotating shaft 10 as the rotating shaft 10 rotates, and supplies outside air from the air intake port 26 to the stator frame 1 as shown by the arrow.
6 into a cooling pipe 36. Here, cooling pipe 3
6 are provided around the entire circumference of the frame 16.
The outside air that has passed through the cooling pipe 36 is exhausted from an exhaust port 38 formed at the lower end of the stator frame 16. On the other hand, the air inside the stator frame 16 is separated from the outside air by a ventilation partition plate 37 and
The cooling pipe 36 is circulated by a centrifugal fan 40 attached to the upper and lower ends of the cooling pipe 36.
It exchanges heat with the outside air flowing inside and is cooled. Note that the lower end bracket 42 provided at the lower end of the stator frame 16 is for installing a vertical fully enclosed external fan-shaped rotating machine.

In the vertical totally enclosed external fan-shaped rotary machine having the above-mentioned structure, ventilation noise is a problem. That is, the noise of rotating machines is broadly classified into electromagnetic noise and ventilation noise, and in medium-high speed machines, the ventilation noise caused by cooling fans is the main noise. Therefore, it is an important issue how to reduce the ventilation noise of a vertical totally enclosed external sector rotating machine. However, in the conventional structure described above, the cooling pipe 36 is connected to the stator frame 1.
6, the number of cooling pipes 36 in the radial direction centering on the rotating shaft 10 is smaller than the total number of cooling pipes 36, so that the radial direction is necessarily the flow path length. The intake passage 33 is short, and the cooling pipe 36 receives outside air almost directly from the outside fan 34. Moreover, the intake port 26
At the tip of the guide plate 32, the outside air entering from
When the cooling pipe 36 is reversed by 180 degrees, the air flow at the inlet of the cooling pipe 36 becomes turbulent, resulting in extremely loud noise.

The present invention was made in order to eliminate the drawbacks of the prior art, and an object of the present invention is to provide a vertical totally enclosed external fan-shaped rotary machine with low ventilation noise.

The present invention provides a rotor provided on a rotating shaft, a cylindrical frame that covers the rotor, a stator provided in the frame and facing the rotor, and a stator provided in the frame and provided in the frame. a cooler that cools the air circulating therein; an inlet provided in the frame to take in outside air to be sent to the cooler;
An air intake passage communicating between an air intake and a cooler, and an external fan provided on the rotating shaft to send outside air taken in from the air intake to the cooler via the intake passage. In the completely enclosed external fan-shaped rotary machine, the air inlets are formed at one end in the axial direction of the frame on three sides of four directions that are spaced apart by 90 degrees around the rotation axis, and the cooler is connected to the four directions. is provided on the outside of the frame along the axial direction of the frame on the other side of the frame, and the air inlet passage communicates with the internal space of the part of the frame where the air inlet is formed, and the air inlet is connected to the upper part of the cooler. It is characterized by the fact that it is provided with a ventilator, thereby reducing noise caused by ventilation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a vertical totally enclosed external fan-shaped rotary machine according to the present invention will be described in detail with reference to the accompanying drawings. Note that the same reference numerals are given to the parts corresponding to the parts explained in the prior art, and the explanation thereof will be omitted.

FIG. 2 is a plan view of an embodiment of the vertical fully enclosed external fan-shaped rotating machine according to the present invention, and FIG. 3 is a partially sectional front view of the embodiment. As shown in FIG. 2, the stator frame 44 of the vertical fully enclosed external sector rotating machine according to the embodiment of the present invention has a square cross section, unlike the conventional cylindrical shape, and supports a bearing housing 46 at the upper end. An upper end bracket 48 is secured. Further, at the upper end of the stator frame 44, intake covers 50, 52, and 54 are attached to three of the four sides, and a cover 56 forming an intake passage is attached to the other side. It is provided.

The air intake covers 50, 52, and 54 are provided along the side surface of the stator frame 44 to cover an air inlet 58 formed in the stator frame 44, and are open at the bottom to guide outside air into the stator frame 44. I'm starting to be able to do it. The inlet port 58 is formed by opening (not shown) a portion of the stator frame 44 that faces the inlet covers 50, 52, and 54. Further, below the cover 56, an air cooler 60 is attached to the side surface of the stator frame 44 along the axial direction. This air cooler 60 has a large number of cooling pipes 36 supported by support plates 62 and 64 fixed to the reinforcing arm 18 of the stator frame 44, and is further provided with an auxiliary plate 66 that extends into the upper part of the stator frame 44. The air in the stator frame 44 is circulated so that the air in the stator frame 44 and the air in the lower part are not mixed too much, so that the inside of the stator frame 44 can be evenly cooled.

Inlet passage 68 formed by cover 56
The outside air entering the air intake passage 68 is appropriately bent by a ventilation guide plate 70 attached to the upper end of the air cooler 60 and guided to the air cooler 60. By choosing the shape and number of the ventilation guide plates 70, it is possible to prevent a stagnation part or a vortex part from occurring in the air flow within the intake passage 68. Note that the intake passage 68 has an intake guide plate 72 attached to the reinforcing arm 18 formed on the inlet side (rotating shaft 10 side), and this intake guide plate 7
2 is bent downward so as to cover the inner peripheral edge of the outer fan 34, and the outer fan 34 covers the intake covers 50, 5.
The intake passage 6 efficiently and smoothly flows the outside air that has entered the internal space 73 of the stator frame 44, which is the part facing each intake port 58 provided inside the stator frame 44.
It is now possible to send it to 8th. Also,
A partition plate 74 is connected to the outer fan 34 on the reinforcing arm 18.
This is to prevent the rotational noise of the rotating machine and electromagnetic noise from leaking outside.

In the vertical fully enclosed external fan-shaped rotating machine configured as described above, as the rotating shaft 10 rotates, the external fan fan 3
4 rotates integrally with the rotating shaft 10, and sucks outside air into the stator frame 44 through air inlets 58 formed on the side surfaces in three directions at the upper end of the stator frame 44. The outside air sucked by the outside fan 34 is sent from the internal space 73 into the air intake passage 68 by the outside fan 34 as shown by the arrow.
The air flows along the ventilation guide plate 70 while being prevented from turbulence, and is guided to the cooling pipe 36 of the air cooler 60. The outside air flowing through the cooling pipe 36 exchanges heat with the air inside the stator frame 44 which is being circulated as shown by the arrow by the centrifugal fan 40 that rotates due to the rotation of the rotating shaft 10, thereby cooling the air inside the stator frame 44. Thereafter, it is discharged into the atmosphere from the exhaust port 38.

As described above, since air flows along the ventilation guide plate 70 in the intake passage 68, there are no air stagnation areas, fewer vortices are generated, the generation of air turbulence is reduced, and ventilation noise is reduced. I can do it. Furthermore, by gathering the cooling pipes 36 on one side inside the stator frame 44 as in the embodiment, the total number of cooling pipes 36 is concentrated on this one side. The number of air passages in the radial direction increases, which not only makes it possible to lengthen the intake passage 68 whose flow path length is in the radial direction, but also allows the ventilation guide plate 70 to be provided within the intake passage 68. The sound-absorbing area (area to which a sound-absorbing material can be attached, such as the inner surface of the cover 56 or the surface of the ventilation guide plate 70) is increased, and the sound-dampening effect can be enhanced. Furthermore, by forming the stator frame 44 into a rectangular shape as in the embodiment, the opening area of the air inlet 58 formed in the stator frame 44 becomes large, and the flow rate of the cooling air (outside air) can be increased. Note that the intake covers 50, 52, and 54 provided on the three sides of the stator frame 44 are
By extending it to the lower part of the stator frame 44, it is possible to lengthen the ventilation passage and improve the noise reduction effect. The inlet cover covers three side surfaces of the stator frame 44, thereby shielding electromagnetic noise and also functioning as a sunshade when the rotating machine is installed outdoors.

FIG. 4 is a partial sectional view showing another embodiment of the vertical totally enclosed external fan-shaped rotating machine according to the present invention. In FIG. 4, the stator frame 44 is provided with an outer wall side surface 76 along the outer surface on the other side of the inlet port 58, and a ventilation passage 78 is formed to allow outside air to circulate. By doing so, the electromagnetic noise generated in the rotating machine is completely blocked by the outside air passing through the outer wall side surface 76 and the ventilation passage 78, and the noise reduction effect can be further enhanced.

In addition, although the case where the cross-sectional shape of the stator frame 44 was square was demonstrated in the said Example, the cross-section of the stator frame 44 does not need to be square.

As explained above, according to the present invention, ventilation noise can be reduced by providing the ventilation guide in the intake passage.

[Brief explanation of the drawing]

FIG. 1 is a front partial cross-sectional view of a conventional vertical totally enclosed external sector rotating machine, FIG. 2 is a plan view of an embodiment of the vertical totally enclosed external sector rotating machine according to the present invention, and FIG. FIG. 4 is a partial cross-sectional view of another embodiment of the vertical totally enclosed external fan-shaped rotary machine according to the present invention.
10... Rotating shaft, 14... Rotor, 16, 44...
...Stator frame, 20...Stator, 26,5
8...Intake port, 37, 72...Intake guide plate, 3
3,68...Intake passage, 34...Outside fan, 6
0... Air cooler, 70... Ventilation guide plate, 73
...Inner space.

Claims (1)

[Claims] 1. A rotor provided on a rotating shaft, a cylindrical frame covering the rotor, a stator provided in the frame and facing the rotor, and a stator provided in the frame. a cooler for cooling the air circulating within the frame; an air inlet provided in the frame to take in outside air to be sent to the cooler; an air intake passage communicating the air inlet and the cooler; In a vertical fully-enclosed external fan-shaped rotating machine having an external fan provided on the rotating shaft and sending outside air taken in from the air inlet to the cooler via the air intake passage, the air inlet is located in the frame. The cooler is formed on three sides of four directions at 90 degree intervals around the rotating shaft at one end in the axial direction, and the cooler is attached to the frame along the axial direction of the frame in the other one of the four directions. A vertical totally-enclosed external fan-shaped rotating device, characterized in that the air inlet passage is provided on the outside of the cooler, and the air inlet passage communicates with the internal space of the portion of the frame where the air inlet is formed, and is provided at the upper part of the cooler. Machine. 2. The vertical fully-enclosed external fan-shaped rotary machine according to claim 1, wherein an inlet guide plate is provided at the entrance of the intake passage, the tip of which covers the inner circumferential edge of the external fan.