JP2020108203A - Totally-enclosed rotary electric machine and leakage liquid detection structure - Google Patents

Abstract

To detect leakage of a liquid coolant on early stage in a totally-enclosed rotary electric machine comprising an external fan for machine inside.SOLUTION: A totally-enclosed rotary electric machine 100 comprises: a rotor 10 including a rotor shaft 11 extending in a horizontal direction and a rotor core 12; a stator 20 including a stator core 21 and a stator coil 22; a frame 30; two bearing brackets 35; two bearings 32; a cooler 40 including a cooling pipe 41 and a cooler cover 42; a fan mechanism 50 including an external fan 51 for machine inside which is provided at the outside of the frame 30, and a fan cover 54 including a lower reservoir 55 capable of temporarily holding a leakage liquid from the cooling pipe 41, and forming a closed space 40a together with the frame 30 and the cooler cover 42; and a leakage detection device for detecting the leakage liquid transferred from the cooler 40 into the fan cover 54.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fully-closed rotary electric machine and a leaked liquid detection structure thereof.

The fully-closed rotary electric machine includes a frame, or a cooler cover when a cooler is provided, and these forms a closed space. In order to cool the heat generating portions of the rotor and the stator, a cooling gas such as air is usually enclosed in the closed space and driven by a fan to circulate in the closed space. The cooling gas is cooled by a cooling medium such as outside air or a cooling liquid in a cooler, for example.

As a fan that drives the cooling gas, there are a self-powered fan that is attached to a rotor shaft and rotates together with the rotor shaft, and a self-powered fan that is driven by an external drive source such as another electric motor. ..

JP-A-63-107440

The cooler is often installed directly above the main body of the rotating electric machine, that is, the stator in the frame. In this case, leakage of the cooling liquid from the cooling pipe in the cooler becomes a problem. When the cooler is liquid cooling, there is a known method to detect the leakage of the cooling liquid from the cooling pipe at an early stage by receiving the cooling liquid below the cooling pipe regardless of whether it is a self-powered fan or a non-powered fan. (See Patent Document 1).

In a rotary electric machine provided with another power fan, the other power fan is usually provided on the outlet side of the cooler, that is, between the cooler and the return to the frame. That is, the cooling gas in the closed space is cooled while passing through the main body portion, then flows into the cooler, is cooled by the cooling medium (cooling liquid in the case of liquid cooling) in the cooler, and is cooled by the other force fan. It flows into the frame again.

By the way, when forming such a circulation flow path, the other force fan is arranged at a position higher than the cooler. Depending on the relationship between the circulation speed of the cooling gas by the other force fan and the size of the leaked droplets of the cooling liquid, the leaked cooling liquid may be sucked by the other force fan and transferred to the main body side. Alternatively, depending on how the cooling liquid leaks, the cooling liquid leaks so as to squirt upward, and the leaked cooling liquid is sucked by the other force fan and transferred to the main body side, and the height position is changed. It may remain around the relatively low body.

In such an event, if it is not recognized that the coolant has leaked, the operation of the rotating electric machine is continued, and the insulation around the main body is deteriorated. Eventually, leakage of the coolant will be confirmed when it is necessary to stop the rotating electric machine due to a periodical inspection or some other factor. Alternatively, the leakage of the cooling liquid may be suspected due to an abnormality on the cooling liquid source side, and the leakage of the cooling liquid may be finally confirmed. As described above, it takes time from the occurrence of leakage of the coolant to the confirmation, and when the electric motor continues to be operated during that period, a short circuit accident may occur in the rotating electric machine.

The above-mentioned problems are the same even in the case of a self-powered fan for the inside of the machine, which is provided outside the frame and is connected to the rotor shaft of the rotating electric machine itself by a belt or a gear. These are collectively referred to as in-flight external fans.

Therefore, it is an object of the present invention to detect early when a leakage of cooling liquid occurs in a fully-closed rotary electric machine having an internal fan.

In order to achieve the above-mentioned object, a fully-closed rotating electric machine according to the present invention includes a rotor having a rotor shaft extending in a horizontal direction, a rotor core attached to an outer side in a radial direction of the rotor shaft, and the rotating body. A stator having a stator core provided through a gap on the outside in the radial direction of the child core, a stator having a stator winding penetrating the stator core, and surrounding the stator on the outside in the radial direction of the stator. Provided above the frame, two bearing brackets attached to both ends of the frame, two bearings attached to the bearing bracket to rotatably support the rotor shaft, and above the frame. A cooling pipe having a cooling pipe through which the cooling liquid passes, a cooling device cover for housing the cooling pipe, an external fan for the in-machine provided outside the frame, and a cooling liquid leaking from the cooling pipe. A fan mechanism having a lower cover capable of temporarily holding a leaked liquid and a fan cover forming a closed space in cooperation with the frame and the cooler cover; and a fan mechanism from the cooler to the inside of the fan cover. And a leakage detection device for detecting the leakage liquid that has migrated to.

Further, the leak liquid detecting structure according to the present invention is provided on a rotor, a stator, a frame, two bearing brackets, two bearings, and above the frame, and includes a cooling pipe and the cooling pipe. A cooler having a cooler cover for accommodating the above, an external fan for the inside of the machine provided on the outside of at least one of the coolers in the axial direction, and an external fan for the inside of the machine, which accommodates the frame and the cooler cover. A fan mechanism having a fan cover that forms a closed space, and a leak liquid detection structure for detecting leak liquid that has moved from the cooler into the fan cover, of the fully-closed rotary electric machine, wherein the leak The fan cover is provided with a leak detection device for detecting liquid, and the fan cover has a lower pool capable of temporarily holding the leaked liquid which is the cooling liquid leaked from the cooling pipe.

According to the present invention, in a fully-closed rotary electric machine having an external fan for in-machine use, it is possible to detect the leakage of the cooling liquid at an early stage.

FIG. 3 is a sectional view taken along the line I-I of FIG. 2 showing the configuration of the fully-closed rotary electric machine according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 showing the configuration of the fully-closed rotary electric machine according to the first embodiment. FIG. 9 is a sectional view taken along the line III-III of FIG. 4 showing the configuration of the fully-closed rotary electric machine according to the second embodiment. FIG. 4 is a lateral cross-sectional view taken along the line IV-IV of FIG. 3 showing the configuration of a fully-closed rotary electric machine according to a second embodiment. It is a fragmentary longitudinal section showing composition of a fan mechanism of a full-closed type rotary electric machine concerning a 3rd embodiment.

Hereinafter, a rotating electric machine and a leaked liquid detection structure thereof according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 is a sectional view taken along the line I-I of FIG. 2 showing the configuration of the fully-closed rotary electric machine according to the first embodiment, and FIG. 2 is a sectional view taken along the line II-II of FIG. Is.
The fully-closed rotary electric machine 100 includes a rotary electric machine body 110, a cooler 40, a fan mechanism 50, and a leak liquid detection structure 80.

The rotary electric machine body 110 includes a rotor 10, a stator 20, two bearings 32, a frame 30, and two bearing brackets 35. The rotor 10 has a rotor shaft 11 extending in the horizontal direction and a cylindrical rotor core 12 attached to the outside of the rotor shaft 11 in the radial direction. The stator 20 has a cylindrical stator iron core 21 provided radially outside the rotor iron core 12 via a gap and a stator winding 22 axially penetrating the stator iron core 21. A cylindrical or rectangular parallelepiped frame 30 is provided so as to surround the outer side of the stator 20 in the radial direction. Bearing brackets 35 are attached to both ends of the frame 30, respectively. The bearing bracket 35 statically supports the bearing 32 that rotatably supports the rotor shaft 11.

A cooler 40 is mounted on the frame 30. The cooler 40 has a plurality of cooling pipes 41 and a cooler cover 42 that houses the cooling pipes 41. A cooling gas such as air for cooling the rotating electric machine main body 110 flows through a space inside the cooler cover 42 outside the cooling pipe 41, and a cooling water or the like is cooled inside the cooling pipe 41 for cooling the cooling gas. Liquid passes through. The cooler cover 42 has a rectangular parallelepiped outer shape. The space inside the cooler cover 42 communicates with the space inside the frame 30 via a cooler inlet opening 43 formed in the lower surface of the cooler cover 42. A cooler outlet opening 44 is formed on each of both side portions of the cooler cover 42 that face each other in the axial direction.

A fan mechanism 50 is arranged on each side of the cooler cover 42 in the axial direction. Each fan mechanism 50 has an internal fan 51 and a fan cover 54. The in-machine external fan 51 has a plurality of blades 52, a drive shaft 53a, and a power unit 53b. The plurality of blades 52 are housed in the fan cover 54.

The drive shaft 53a passes through the side plate 54w of the fan cover 54 on the side facing the power unit 53b in the direction parallel to the rotation axis of the rotating electric machine body 110 from the power unit 53b such as an electric motor, and is located inside the fan cover 54. It is extended. The plurality of blades 52 are attached to a drive shaft 53a and are integrally driven by a power unit 53b to rotate. As the in-machine external fan 51, cooling gas is sucked in from the outside in the axial direction, and from the inside in the radial direction in the radial direction. It has the function of a centrifugal fan that discharges to the outside.

The fan cover 54 accommodates the plurality of blades 52 and forms a closed space 40a together with the cooler cover 42 and the frame 30.

The fan cover 54 has a cylindrical outer shape with its axis oriented in the horizontal direction. It has two side plates 54v and 54w that are arranged in the axial direction so as to face each other and that have substantially the same shape and the same size, and a tubular plate 54r that connects the outer edges of these side plates 54v and 54w. Further, the outer shape of the entire fan cover 54 is a shape in which a cylindrical portion and the discharge portion 54c are combined.

A suction opening 54 a is formed in the side plate 54 v facing the cooler 40. The suction opening 54 a is connected to the cooler outlet opening 44 via the inlet connection portion 56. The space inside the fan cover 54 communicates with the space inside the cooler cover 42 via the inlet connection portion 56.

As shown in FIG. 2, the fan cover 54 has a radially outer end of the plurality of blades 52 on the radially outer side of the plurality of blades 52 so as to be radially spaced from the radially outer end of the plurality of blades 52. Is formed so as to surround the plurality of wings 52 in the circumferential direction. The fan cover 54 is connected to the outlet connection portion 57 at the discharge portion 54c which is the downstream side portion of the flow. The end portion of the outlet connection portion 57 opposite to the connection end with the fan cover 54 is connected to the frame 30, and the space inside the fan cover 54 and the outlet connection portion 57 is inside the frame 30 via the frame inlet opening 31. It communicates with the space.

The part of the fan cover 54 facing the lowermost ends of the plurality of blades 52 forms a lower pool 55 capable of temporarily holding the leaked liquid when the cooling liquid leaks.

The leak liquid detecting structure 80 has a fan cover 54 in which the lower pool 55 is formed and a leak detecting device 70. The leak detection device 70 has a lead-out pipe 71 and a detector 72. The upper end of the outlet pipe 71 is connected to the lowermost end of the lower pool 55, and the lower end is connected to the detector 72.

Examples of the method of the detector 72 include an optical detection method, a current detection method, a capacitance change method, and a magnetic field change method. Either method may be used, or another method may be used.

Next, the operation of the fully-closed rotary electric machine and the leaked liquid detection structure thereof according to the present embodiment will be described.

Now, it is assumed that a leakage of a cooling liquid such as cooling water flowing inside the cooling pipe 41 of the cooler 40 occurs. In this case, if the leaked droplets of the cooling liquid are sufficiently large, they drop downward and the leak is detected.

On the other hand, when the cooling liquid leaks so as to squirt upward, or when the leaked droplets of the cooling liquid are smaller than such a size, the rate of dropping downward is reduced and the cooling medium is driven by the fan mechanism 50. The proportion of the cooling gas that circulates inside the closed space 40a and moves toward the fan mechanism 50 increases. That is, the coolant leaked from the cooling pipe 41 rides on the flow of the cooling gas, rises inside the cooler cover 42, flows out from the cooler outlet opening 44, and is sucked in via the inlet connection portion 56. It flows into the fan cover 54 through the opening 54a. The cooling gas containing the droplets that has flowed into the fan cover 54 flows into the flow path between the plurality of blades 52 and flows radially outward, and from the flow path between the blades 52, the cooling gas of the blades 52 and the fan cover 54 flows. It flows out into the radially outer space 54b between the tubular plate 54r.

A part of the liquid droplets that have flowed into the radially outer space 54b along with the flow of the cooling gas further flow along with the flow of the cooling gas and move to the discharge portion 54c, and pass through the outlet connection portion 57 to the frame inlet. It flows into the frame 30 through the opening 31. In addition, the remaining portion of the droplets flows down the side plates 54v and 54w of the fan cover 54 or the inner surface of the tubular plate 54r to the lower pool 55 in the fan cover 54, and temporarily stays in the lower pool 55 as a leak liquid. ..

The leaked liquid that has accumulated in the lower pool 55, that is, the leaked cooling liquid is guided to the detector 72 via the outlet pipe 71 of the leak detection device 70, and the generation of the leaked liquid is reliably detected.

As described above, according to the present embodiment, in the fully-closed rotating electric machine having the external fan for the inside of the machine, the leakage of the cooling liquid occurs, including the case of the upward leakage in the cooler which has not been conventionally assumed. If it does, this can be detected early.

[Second Embodiment]
3 is a sectional view taken along the line III-III of FIG. 4 showing the configuration of the fully-closed rotary electric machine according to the second embodiment, and FIG. 4 is a sectional view taken along the line IV-IV of FIG. Is.

The second embodiment is a modification of the first embodiment. In the second embodiment, the fully-closed rotary electric machine 101 has two sets of outlet cells 61, which are not provided in the first embodiment, and an outlet connection portion 62 connected to the outlet cell 61. Further, the fan mechanism 50a does not have the outlet connection portion 57 in the first embodiment. Except for the portions related to these, it is the same as in the first embodiment.

Each outlet cell 61 is arranged adjacent to the fan cover 54 in the axial direction between the fan cover 54 and the power unit 53b.

In the first embodiment, the cooling gas is discharged from the fan cover 54 by the flow in the circumferential direction passing through the discharge portion 54c at the radially outer portion. However, in the second embodiment, the cooling gas is discharged. Since the cooling gas is discharged from the fan cover 54 by the flow toward the outlet cells 61 that are adjacent in the axial direction, the side plates 54v and 54w of the fan cover 54 have a substantially circular shape.

An outflow opening 58a of the fan cover 54 is formed in the side plate 54w on the outlet cell 61 side of the two side plates 54v and 54w of the fan cover 54. The outflow opening 58a formed in the side plate 54w occupies most of the area of the side plate 54w.

Here, when viewed from the in-machine external fan 51 side, the portion of the side plate 54w that seems to project from the tubular plate 54r toward the drive shaft 53a of the in-machine external fan 51, that is, toward the inner side in the radial direction. It will be called the opening edge portion 58. The projecting width of the opening edge portion 58 is formed to be small above the outflow opening 58a and larger than the upper portion for temporarily holding the leaked cooling liquid below the outflow opening 58a, that is, near the lower pool 55. Has been done.

The part of the fan cover 54 facing the lowermost ends of the plurality of blades 52 forms a lower pool 55 capable of temporarily holding the leaked liquid when the cooling liquid leaks.

The outlet cell 61 has two substantially disk-shaped side plates 61v and 61w that spread in a direction perpendicular to the rotation axis and face each other, and a tubular plate 61r that connects these.

The drive shaft 53a of the fan mechanism 50a penetrates the side plate 61w of the outlet cell 61 on the side opposite to the fan cover 54, and extends into the fan cover 54.

An inflow opening 61a is formed in the side plate 61v of the outlet cell 61 on the fan cover 54 side so as to correspond to the outflow opening 58a of the fan cover 54. The space inside the fan cover 54 communicates with the space inside the outlet cell 61 through the outflow opening 58a and the inflow opening 61a. When the fan cover 54 and the outlet cell 61 are integrally manufactured, the side plate 54w of the fan cover 54 on the outlet cell 61 side and the side plate 61v of the outlet cell 61 on the fan cover 54 side are configured by one plate. Good.

An outlet opening 61b is further formed below the inlet opening 61a in the side plate 61v of the outlet cell 61 on the fan cover 54 side. An outlet connection portion 62 connects the outflow opening 61b and the frame inlet opening 31. The space inside the outlet cell 61 communicates with the space inside the frame 30 via the outlet connecting portion 62. The outflow opening 61b may be formed in a portion other than the side plate 61v, that is, the side plate 61v or the tubular plate 61r.

The leak liquid detection structure 80 has the fan cover 54 in which the lower pool 55 is formed and the leak detection device 70, as in the first embodiment. The leak detection device 70 has a lead-out pipe 71 and a detector 72, one end of the lead-out pipe 71 is connected to the lowermost end of the lower pool 55, and the other end is connected to the detector 72. ..

Next, the operation of the fully-closed rotary electric machine and the leaked liquid detection structure thereof according to the second embodiment will be described.

When the leakage of the cooling liquid occurs in the cooling pipe 41 of the cooler 40, the leaked droplets of the cooling liquid ride on the flow of the cooling gas, flow into the fan cover 54, and then flow from the flow path between the blades 52. The process is similar to that of the first embodiment until it flows into the space between the blade 52 and the tubular plate 54r.

The cooling gas including the droplets that have flowed out into the space between the blade 52 and the fan cover 54 flows into the outlet cell 61 from the outflow opening 58a, and then flows out from the outflow opening 61b of the outlet cell 61 to the outlet connection portion 62, Further, it flows into the frame 30 through the frame inlet opening 31.

The outflow opening 58a of the side plate 54w in which the outflow opening 58a is formed in the fan cover 54 is formed leaving an opening edge portion 58 near the outer edge of the side plate 54w of the fan cover 54.

The outflow opening 58a is sufficiently large, and the opening edge 58 of the side plate 54w of the fan cover 54 only slightly protrudes toward the flow path side. Therefore, the opening edge 58 increases the pressure loss of the flow of the cooling gas. Is small.

On the other hand, the liquid droplets that flow into the space between the blades 52 and the fan cover 54 along with the radially outward flow of the cooling gas are scattered outward in the radial direction, so that the fan cover such as the cylindrical portion 54r is mainly used. It collides with the radially outer portion in 54. The liquid droplets that collide with the radially outer portion of the fan cover 54 try to move to the outlet cell 61 side due to the flow of the cooling gas, but the opening edge portion 58 hinders the transfer from the fan cover 54 to the outlet cell 61. Most of them remain in the fan cover 54. As a result, the droplets flow down the tubular portion 54r of the fan cover 54 or the side plates 54v and 54w to the lower pool 55 in the fan cover 54, and temporarily stay in the lower pool 55. Further, as a result of suppressing the outflow of the droplets to the outside of the fan cover 54, the amount of the leaked cooling liquid that moves to the lower pool 55 increases, so that the detection of the leaked liquid can be further accelerated.

[Third Embodiment]
FIG. 5 is a partial vertical cross-sectional view showing the configuration of the fan mechanism of the fully-closed rotary electric machine according to the third embodiment. The third embodiment is a modification of the second embodiment.

In the third embodiment, the fan mechanism 50b has a transition prevention plate 59 connected to the edge of the outflow opening 58a. Other than this, it is the same as the second embodiment.

The transition prevention plate 59 has a partially conical shape in which the axis is oriented in the direction of the drive shaft 53a, and the outer opening end 59a, which is the end on the smaller diameter side, has the outflow opening 58a of the opening edge 58. Connect with the part of. The transition prevention plate 59 extends from the outer open end 59a toward the blade 52 and increases in diameter to the inner open end 59b which is the end on the larger diameter side. The curved surface shape of the migration prevention plate 59 is preferably a shape that does not increase the pressure loss when the cooling gas passes.

The shape of the migration prevention plate 59 is not limited to the partial conical shape, and a streamlined curved surface along the flow is preferable. Further, the outer opening end 59a may be in contact with the tubular plate 54r at a part of the periphery thereof.

In the fan mechanism 50b of the fan mechanism of the fully-closed rotary electric machine according to the third embodiment configured as described above, by providing the transition prevention plate 59 on the fan cover 54, the transition from the fan cover 54 to the outlet cell 61 is performed. Liquid droplets further hinder the transfer, the amount of the leaking liquid temporarily retained in the lower pool 55 is further increased, and the occurrence of the leakage of the cooling liquid can be detected earlier.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention.

For example, in the embodiment, the case where a centrifugal fan or an axial flow fan is used as the in-machine external fan has been described as an example, but the present invention is not limited to this. A mixed flow fan may be used as long as it forms a lower pool at the bottom of the fan cover.

Further, in the embodiment, the case where the outer shape of the cooler cover is a rectangular parallelepiped is shown as an example, but the present invention is not limited to this. The outer shape of the fan cover is not limited to the cylindrical shape. In other words, a part of the liquid droplets that have moved from the cooling cover to the inside of the fan cover due to the flow of the cooling gas can be temporarily held inside the fan cover, and the temporarily held leaked liquid is discharged from that part to the outside of the fan cover. Any shape is acceptable.

Further, in the embodiment, the case where the fan mechanism is provided on both sides of the cooler with the cooler interposed is shown as an example, but the present invention is not limited to this. The flow of the cooling gas may be formed only in one axial direction from the cooler, and the fan mechanism may be provided in only one side.

Further, in the embodiment, the case where the in-machine external fan is a multi-force type that is driven by external power is shown as an example, but the present invention is not limited to this. For example, it may be a case of a self-powered fan for internal use that is provided outside the frame and is connected to the rotor shaft of the rotating electric machine itself by a belt or a gear.

Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and the gist of the invention.

10... Rotor, 11... Rotor shaft, 12... Rotor core, 20... Stator, 21... Stator core, 22... Stator winding, 30... Frame, 31... Frame inlet opening, 32... Bearing, 35... Bearing bracket, 40... Cooler, 40a... Closed space, 41... Cooling pipe, 42... Cooler cover, 43... Cooler inlet opening, 44... Cooler outlet opening, 50, 50a, 50b... Fan mechanism, 51... Inside the machine External fan, 52... Blades, 53a... Drive shaft, 53b... Power part, 54... Fan cover, 54a... Suction opening, 54b... Radial outer space, 54c... Discharge part, 54r... Cylindrical plate, 54v, 54w... Side plate, 55... Lower pool, 56... Inlet connection part, 57... Outlet connection part, 58... Opening edge part, 58a... Outflow opening, 59... Migration prevention plate, 59a... Outer opening end, 59b... Inner opening end, 61... Outlet cell, 61a... Inflow opening, 61b... Outflow opening, 61r... Cylindrical plate, 61v, 61w... Side plate, 62... Exit connection part, 70... Leak detection device, 71... Outlet pipe, 72... Detector, 80... Leak Liquid detection structure, 100, 101... Fully-closed rotating electric machine, 110... Rotating electric machine body

Claims (7)

A rotor having a rotor shaft that extends in the horizontal direction and a rotor core that is attached to the outer side of the rotor shaft in the radial direction;
A stator having a stator core provided radially outside the rotor core via a gap, and a stator winding penetrating the stator core;
A frame arranged so as to surround the stator on a radially outer side of the stator;
Two bearing brackets attached to both ends of the frame,
Two bearings attached to the bearing bracket to rotatably support the rotor shaft;
A cooler that is provided above the frame and has a cooling pipe through which a cooling liquid passes, and a cooler cover that houses the cooling pipe,
In combination with the external fan for in-flight provided outside the frame and a lower pool capable of temporarily holding the leaked liquid which is the coolant leaked from the cooling pipe, together with the frame and the cooler cover. A fan mechanism having a fan cover forming a closed space;
A leak detection device that detects leak liquid that has moved into the fan cover from the cooler,
A fully-closed rotating electric machine comprising: The internal external fan is a radial type that sucks cooling gas from the axial direction and flows out to the radial outside.
The fan cover has a suction opening for suction in the axial direction, and a discharge portion that communicates with the frame.
The fully-closed rotary electric machine according to claim 1, wherein: The leak detection device,
A lead-out pipe for leading out the leaked liquid transferred from the cooler to the lower pool, from the lower pool,
A detector that receives and detects the leaked liquid that has passed through the outlet pipe,
The fully-closed rotary electric machine according to claim 1 or 2, further comprising: The fully closed rotary electric machine according to any one of claims 1 to 3, wherein the discharge portion of the fan cover is formed along a circumferential direction on a radially outer side of the in-machine external fan. .. An outlet cell arranged on the opposite side of the fan cover in the axial direction of the cooler,
An outlet connection portion that connects the outlet cell and the frame,
The fully-closed rotary electric machine according to any one of claims 1 to 3, further comprising: The fully closed rotary electric machine according to claim 5, wherein a transition prevention plate is provided at an outflow opening of the fan cover that communicates the fan cover with the outlet cell. A cooler having a rotor, a stator, a frame, two bearing brackets, two bearings, a cooling pipe provided above the frame, and a cooler cover for housing the cooling pipe. An outer fan for an in-machine provided outside at least one axial direction of the cooler, and a fan cover for accommodating the outer fan for the in-machine and forming a closed space together with the frame and the cooler cover. A leaking liquid detection structure for detecting a leaking liquid that has moved into the fan cover from the cooler of a fully-closed rotating electric machine including a fan mechanism,
Equipped with a leak detection device for detecting the leaked liquid,
The fan cover has a lower pool capable of temporarily holding a leaked liquid which is a coolant leaked from the cooling pipe.
Leakage liquid detection structure characterized by the following.

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