JPH0528935Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention is a so-called fully enclosed self-cooling system in which an air cooler cooled by a cooling liquid is placed above the stator, and is used for horizontal axis rotating electric machines. It is something.

[Conventional technology]

A conventionally known rotating electric machine of this type is shown in FIG. In FIG. 3, 1 is a rotor provided at the center of the rotating shaft 20, 2 is a cooling fan provided on the rotating shaft 20, 3 is a stator consisting of a stator core 5 and a stator wire ring 6, and 4 is a stator provided at the center of the rotating shaft 20. A stator box frame, 7 is a wind guide, 8 is a bearing device that supports the rotating shaft 20, 9 is an intake hole provided in the ceiling plate 14 of the stator box frame 4, 10 is also an exhaust hole, and 11 is a cold water , a cooler that cools the air. Reference numerals 12 and 13 denote duct covers that constitute a ventilation passage 24 on the stator box frame 4. Arrows indicate the flow of cooling air.

Next, the ventilation operation will be explained.

The air cooled by the cooler 11 passes through the intake hole 9
through the cooling fan 2, and is forcibly pushed into the interior, as shown by the arrow in Figure 3.
The iron core, coil parts, etc. of the rotating electric machine are cooled and discharged to the outer periphery of the stator iron core 5, and reach the cooler 11 again through the exhaust hole 10 in the upper part of the iron core 5.

[The problem that the idea aims to solve]

Conventional rotating electric machines have a horizontal axis, and the stator box frame 4
Since the cooler 11 is installed at the top of the machine, in the unlikely event that the cooler malfunctions, that is, if the cooling pipe 11a leaks water, water droplets will flow directly into the machine, where the iron core and wire rings are located, along the air flow. There was a serious problem of infiltration.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a rotating electric machine that can prevent water from leaking from the cooler from entering the machine even if the cooler is installed above the stator.

[Means to solve the problem]

The rotating electric machine according to this invention has a box-like structure, houses a rotor with a horizontal shaft and a stator corresponding to it, has suction ports at the axial ends of both side plates, and has a suction port for the stator. A stator box frame with an open upper part of the iron core, and a ceiling plate having a first vent provided on the stator box frame excluding the upper part of the iron core of the stator and opened at the same axial position as the suction port. a first ventilation duct having an opening formed at its widthwise end; provided on the outside of the side plate of the stator box frame; A second ventilation duct has a passage extending from the outside of the stator to the suction port, and in the middle of this passage, the second ventilation duct has a jamb plate for bending the wind in the axial direction. The air conditioner is provided with a cooler that is placed above the first ventilation duct in the ventilation path formed between the airflow duct and the first ventilation opening, and that cools the air with a cooling liquid.

[Effect]

The rotating electric machine in this invention bends the wind that has passed through the cooler in the width direction within the first ventilation duct through the first ventilation opening, and then passes through the widthwise end opening of the first ventilation duct. , the flow is guided into the second ventilation duct and bent in the axial direction, and the flow is lowered in the second ventilation duct and the flow is bent in the axial direction before reaching the suction port.

Therefore, even if there is water leakage from the cooler, the wind is bent many times during the journey from the cooler to the suction port, so water droplets, which have a large inertia compared to air, cannot be folded in the same way as the wind flow. Eventually, the air left at the bottom of the second ventilation duct and free of water droplets will be sucked into the stator box frame through the suction port.

[Example of idea]

An example of this invention is shown below in Figures 1 and 2.
This will be explained based on FIGS. 4 and 5. In addition,
In FIG. 4, illustration of the wire wheels etc. are omitted for convenience.

In the figure, reference numeral 15 has a box-like structure, and houses a rotor 1 with a horizontal axis and a stator 3 corresponding thereto. The stator box frame 16 is provided on the ceiling plate 22 of the stator box frame 15 at both ends in the axial direction, except for the stator core 5 portion, and the stator box frame 16 is covered with the ceiling plate 22 other than the upper part of the iron core 5. The first ventilation duct 19 has the same width as the width of the stator box frame 15.
The first opening is at the same axial position as 8.
A ventilation hole 25 is formed at the widthwise end of the first ventilation duct 16, and a second ventilation hole is formed by opening the widthwise end entirely; 17 is the stator box frame 15.
It is vertically provided outside the widthwise ends of both side plates 23 and the first ventilation duct 16, and its upper part communicates with the second ventilation port 25 in the width direction, and its lower part communicates with the suction port 18 in the width direction. The second ventilation duct 27 is configured to bend the wind from the second ventilation port 25 to the suction port 18 in the axial direction.
A third vent is opened between the vertical passage between the vent 25 and the suction port 18, displaced in the axial direction from the line connecting the second vent 25 and the suction port 18; 21 is a stator; An exhaust port 24 is opened at the top of the iron core 5, and a ventilation passage 24 communicates between the exhaust port 21 and the first ventilation port 19, and is covered with the duct covers 12 and 13. A cooler placed on the ceiling plate 16a of the ventilation duct 16, located in the ventilation path 24 and interposed between both duct covers 12 and 13; 28 is a drain plug provided at the bottom of the second ventilation duct 17; It is. Reference numeral 29 denotes an eighth ventilation hole 27 located in the middle of the vertical passage of the second ventilation duct 17 and at the same height as the ceiling plate 22 of the stator box frame 15.
This is a cutting board that closes off a part of the vertical passage in the second ventilation duct 17, leaving a portion of the vertical passage in the second ventilation duct 17, and prevents the wind from going straight from the second ventilation port 25 to the suction port 18. Note that the other configurations are the same as those of the conventional one, so explanations will be omitted.

Next, the ventilation operation will be explained. In the diagram, the arrow indicates the wind flow, the dashed arrow indicates the wind flow on the other side of the wall, the mark symbol indicates the direction of the wind toward the front, the ○ symbol indicates the direction of the wind toward the front, and the symbol indicates the direction of the wind toward the front. indicates the wind flow in the opposite direction to the circle mark.

Due to the pushing force of the cooling fan 2, the heated air passes through the ventilation ducts of the rotor 1, stator wire 6, and stator core 5, and is discharged to the outer periphery of the stator core 5, and the upper part of this core The air enters the ventilation passage 24 through the exhaust port 21 of the cooling device, is cooled by cold water in the cooler 11, passes through the first ventilation port 19, descends, and enters the first ventilation duct 16. Here, the air is largely bent in the axial direction as shown in FIG. 4B, passes through the second ventilation holes 25 on both sides of the first ventilation duct 16, and is further bent in the width direction as shown in FIG. 4C. It then enters the second ventilation duct 17, descends through the third ventilation port 27, and is bent in the axial direction as shown in FIG. 4D to reach the suction port 18. When entering the machine after passing through the suction port 18, it is further bent by 90° and advances in the axial direction to reach the cooling fan 2.

In the unlikely event that there is a water leakage accident in the cooler 11, water droplets will fall with the wind flow, but
Since the water droplets are bent many times before reaching the second ventilation duct 17, the water droplets, which have a large inertia compared to air, cannot follow the flow of the wind and eventually fall to the bottom of the second ventilation duct 17 and remain. The wind will be sucked into the cabin with most of the water droplets removed.

Note that the water droplets that have fallen to the bottom of the second ventilation duct 17 are discharged to the outside of the rotating electric machine by the drain plug 28.

[Effect of idea]

As described above, according to this invention, the air discharged from the outer periphery of the stator core and passed through the cooler descends and enters the first ventilation duct on the ceiling plate of the stator box frame, and then flows in the width direction. After being bent, it descends in the second ventilation duct, is bent in the axial direction, passes through the suction port, enters the stator box frame, and then passes through the cooling fan to reach the core and wire parts. As a result, the flow of air is bent many times before reaching the air inlet, and even if water leaks from the cooler, water droplets will remain in the second ventilation duct, preventing the air from being drawn into the cabin. Since it does not contain water droplets, it is possible to obtain a highly reliable rotating electrical machine without any problems such as wire insulation failure.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a fully enclosed rotating electric machine according to an embodiment of the invention, and FIG. 2 is a cross-sectional view taken along the line - in FIG. 1. , FIG. 3 is a longitudinal cross-sectional view of a conventional fully enclosed rotating electric machine, FIG. 4 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 5 is a cross-sectional view taken along the first V-V line. It is. DESCRIPTION OF SYMBOLS 1...Rotor, 3...Stator, 5...Stator core, 6...Stator coil, 11...Cooler, 15...
...Stator box frame, 16...First ventilation duct, 16
a...The ceiling board, 17...Second ventilation duct,
18... Suction port, 19... First ventilation port, 21...
...Exhaust port, 23...Stator box frame side plate, 24...
...Ventilation duct, 25...Second ventilation port (width direction end opening of first ventilation duct, 27...Third ventilation port,
29...Fusagi board. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A stator that is configured in a box shape and houses a rotor with a horizontal axis and a stator corresponding thereto, has suction ports at the axial ends of both side plates, and has an opening at the top of the iron core of the stator. The box frame is provided on the stator box frame excluding the upper part of the iron core of the stator, and has a first vent in the ceiling plate that is opened at the same axial position as the suction port, and has an opening at the widthwise end. A first ventilation duct having a shape formed therein is provided on the outside of the side plate of the stator box frame, and hangs down on the outside of the stator box frame through the width direction end opening of the first ventilation duct, and A second ventilation duct has a passage leading to the suction port, and in the middle of this passage, a second ventilation duct has a jamb plate that bends the wind in the axial direction, and a second ventilation duct is connected from the upper part of the iron core of the stator to the first ventilation port. in the ventilation passage formed between the first
A cooler is mounted on the upper part of the ventilation duct and cools the air with a cooling liquid, and the air discharged from the upper part of the iron core of the stator is passed through the cooler and the first vent to the first air duct. The flow is bent in the width direction in the ventilation duct, and after passing through the width direction end opening of the first ventilation duct, it is guided to the second ventilation duct, and the flow is bent in the axial direction, and the flow is bent in the axial direction. A rotating electric machine in which the inside of a ventilation duct is lowered and the flow is folded in the axial direction, and then the flow is brought to the above-mentioned suction port.