JP6960367B2 - Fully enclosed fan-shaped rotary electric machine and fan cover - Google Patents

Description

The present invention relates to a fully enclosed external fan type rotary electric machine and an external fan cover thereof.

The rotary electric machine includes a rotor and a stator, and usually also includes a frame for accommodating the rotor core and the stator. Further, normally, both ends of the frame in the axial direction are closed by bearing brackets. The bearing bracket statically supports the bearing that rotatably supports the rotor. In a fully closed rotary electric machine, a closed space is formed by a frame, a bearing bracket, and a bearing.

Due to the operation of the rotary electric machine, iron loss is generated in the rotor core and the stator core, and copper loss is generated in the stator winding, and heat is generated due to these losses. Therefore, it is necessary to remove the heat generated in the closed space from the closed space.

For this reason, there is an example in which a cooling pipe is provided in a closed space, and as a cooling medium in the cooling pipe, for example, water or outside air is allowed to flow and the cooling pipe is cooled through the pipe wall of the cooling pipe. Further, there is an example in which heat is removed through the surface of the frame without providing a cooling pipe. In this case, it is common to provide fins on the surface of the frame to secure a larger heat transfer area.

Japanese Patent No. 5797183

In the method of releasing heat through the surface of the frame, when the heat transfer between the outside air and the heat transfer of the frame surface is performed by forced convection heat transfer, in general, in order to forcibly send the outside air to the frame surface, the rotor shaft It is common to attach an external fan to the part outside the frame. Further, an outer fan cover is provided around the outer fan so that the outside air driven by the outer fan flows along the surface of the frame. Further, the fins on the surface of the frame are arranged so as to extend in the axial direction so as not to disturb the flow of the outside air forcibly sent in the axial direction.

For example, in a rotary electric machine installed in a dust environment such as for crushing rocks, if it is not cleaned regularly, there will be a problem that vibration is generated due to eccentricity due to the adhesion of dust and the air volume is reduced. In such a case, removing the outer fan cover integrally in the axial direction places a heavy load on the workplace, and it is also necessary to secure a space in the axial direction.

In such a case, it is desired to have a configuration in which the outer fan can be accessed without removing the outer fan cover integrally. Further, when an abnormality such as vibration is found, it is desirable to have a configuration in which the surroundings of the outer fan can be easily confirmed.

Therefore, an object of the present invention is to facilitate the handling of the outer fan cover of a fully enclosed external fan type rotary electric machine.

In order to achieve the above object, the fully enclosed external fan-shaped rotary electric machine according to the present invention has a rotor shaft extending in the horizontal direction and rotatably supported, and a rotor core provided on the radial outer side of the rotor shaft. A stator having a rotor, a cylindrical stator core provided on the radial outer side of the rotor core, a stator winding penetrating the stator core in the axial direction, and a stator of the stator. A frame arranged on the outer side in the radial direction to house the rotor core and the stator, and two bearings supporting the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core in between. , The two bearing brackets that are brought close to each other so as to close both ends in the axial direction of the frame and support each of the bearings, and one of the bearing brackets of the rotor shaft that is attached to the outer side in the axial direction. An outer fan that supplies outside air to the radial outer surface of the frame and an end plate that covers the outer fan so as to form a flow path for the outside air to the radial outer surface of the frame and has a suction port for the outside air. The outer fan cover is provided with an outer fan cover having a side cover portion arranged on the outer side in the radial direction of the outer fan, and the side surface cover portions are two symmetrical to each other with respect to a vertical plane passing through the rotation center of the rotor shaft. It has groups, and each group is characterized by having a plurality of portions that can be moved in the circumferential direction.

Further, the outer fan cover according to the present invention provides a rotor having a rotor shaft, a stator, a frame, two bearings, two bearing brackets, and an outside that supplies outside air to the radial outer surface of the frame. An outer fan cover in a fully enclosed external fan type rotary electric machine provided with a fan, the end of which covers the outer fan so as to form a flow path of the outside air to the radial outer surface of the frame and in which the suction port for the outside air is formed. It has a plate and a side cover portion arranged on the outer side in the radial direction of the outer fan, and the side cover portion has two groups symmetrical with respect to a vertical plane passing through the rotation center of the rotor shaft. However, each group is characterized in that each has a plurality of portions that can be moved in the circumferential direction.

According to the present invention, it is possible to facilitate the handling of the outer fan cover of the fully enclosed external fan type rotary electric machine.

It is a vertical cross-sectional view which shows the structure of the fully enclosed fan-shaped rotary electric machine which concerns on embodiment. It is a conceptual perspective view which shows the structure of the outer fan and the outer fan cover of the fully closed outer fan type rotary electric machine which concerns on embodiment. It is a perspective view which shows the structure of the outer fan cover which concerns on embodiment. It is a conceptual cross-sectional view which shows the normal attachment state of the side plate in the outer fan cover which concerns on embodiment. It is a conceptual cross-sectional view which shows the state of the side cover part when the upper part of the outer fan cover which concerns on embodiment is opened. It is a conceptual cross-sectional view which shows the state of the side cover part when the lower part of the outer fan cover which concerns on embodiment is opened.

Hereinafter, a fully enclosed fan-shaped rotary electric machine and an outer fan cover thereof according to an embodiment of the present invention will be described with reference to the drawings. Here, parts that are the same as or similar to each other are designated by a common reference numeral, and duplicate description will be omitted.

FIG. 1 is a vertical cross-sectional view showing the configuration of a fully enclosed fan-shaped rotary electric machine according to an embodiment. The fully enclosed external fan type rotary electric machine 200 includes a rotor 10, a stator 20, a coupling side bearing 30a, an anti-coupling side bearing 30b, a frame 40, a coupling side bearing bracket 45a, an anti-coupling side bearing bracket 45b, an outer fan 55, and an outer fan. It has a cover 100. Here, a case where the fully enclosed fan-shaped rotary electric machine 200 is a cage type induction motor is shown as an example.

The rotor 10 has a rotor shaft 11 extending horizontally in the rotation axis direction, a rotor core 12 provided on the radial outer side of the rotor shaft 11, and a plurality of conductor portions 13. The rotor shaft 11 is rotatably supported by an anti-coupling side bearing 30a and a coupling side bearing 30b, respectively, at two locations sandwiching the rotor core 12 in the axial direction. At one end of the rotor shaft 11, a coupling portion 11a such as a flange is provided for coupling with a drive target when the rotary electric machine is an electric machine or with a prime mover when the rotary electric machine is a generator. There is. Here, the direction of the bonding portion 11a in the axial direction is referred to as a bonding side, and the opposite direction is referred to as an antibonding side.

The plurality of conductor portions 13 are arranged at intervals in the circumferential direction. Each conductor portion 13 has a conductor bar that axially penetrates the vicinity of the radial surface of the rotor core 12 and a short-circuit ring that connects all the conductor bars to each other on both outer sides of the rotor core 12 in the axial direction to short-circuit them. Has.

An inner fan 15 is attached to the rotor shaft 11 between the rotor core 12 and the antibonding side bearing 30b in the axial direction. The inner fan 15 shown in FIG. 1 shows the case of a centrifugal fan.

The stator 20 has a stator core 21 and a stator winding 22. The stator core 21 is provided on the radial outer side of the rotor core 12 and has a cylindrical shape. A plurality of slots (not shown) extending in the rotation axis direction are formed on the inner surface of the stator core 21 in the radial direction at intervals in the circumferential direction, and the stator winding 22 penetrates into each slot. ..

The rotor core 12 and the stator 20 are surrounded by a frame 40 arranged radially outward. A bonding side bearing bracket 45a and an antibonding side bearing bracket 45b are attached to both ends of the frame 40 in the rotation axis direction. The coupling side bearing 30a and the anti-coupling side bearing 30b that rotatably support both side portions of the rotor shaft 11 sandwiching the rotor core 12 are fixedly supported by the coupling side bearing bracket 45a and the anti-coupling side bearing bracket 45b, respectively. There is.

The frame 40, the coupling side bearing bracket 45a and the anti-coupling side bearing bracket 45b, the coupling side bearing 30a and the anti-coupling side bearing 30b form a closed space 40a together with each other. The closed space 40a is filled with a cooling gas (inside air) such as air.

The frame 40 is formed with at least one frame ventilation passage 41 extending in the axial direction in order to circulate the cooling gas. When a plurality of frame ventilation passages 41 are formed, the plurality of frame ventilation passages 41 are arranged at intervals in the circumferential direction. An inlet opening 42 is formed on the anti-bonding side and an outlet opening 43 is formed on the coupling side in the portion of the frame 40 where the frame ventilation passages 41 are formed. The space 40c in the passage in each frame ventilation passage 41 communicates with the heat generating side space 40b on the rotor core 12 and the stator 20 side via the inlet opening 42 and the outlet opening 43, and is one of the closed spaces 40a. Form a part.

A plurality of fins (not shown) are formed on the outer surface of the frame 40 except for the region where the frame ventilation passage 41 is formed.

The cooling gas is driven by the inner fan 15 and circulates in the closed space 40a to cool the rotor core 12, the stator 20, and the like. That is, the cooling gas driven by the inner fan 15 flows into the frame ventilation passage 41 from the inlet opening 42, flows axially toward the coupling side in the passage inner space 41c, and heat-generating side space from the outlet opening 43. It flows out to the joint side portion of 40b.

The cooling gas that has flowed into the coupling side portion of the heat generating side space 40b flows into the rotor core 12 and the stator 20 side, and after cooling these, flows out to the anti-bonding side portion of the heating side space 40b. It flows into the inner fan 15 again.

An outer fan 55 is attached to a portion of the rotor shaft 11 axially outside the bearing 30b on the antibonding side. The outer fan cover 100 is provided so as to surround the outer fan 55. The outer fan cover 100 has an end plate 110 and a side cover portion 120. The end plate 110 is circular and is arranged on the outer side in the axial direction of the outer fan 55 to form a suction port 110a for taking in outside air. The side cover portion 120 is connected to the periphery of the end plate 110 and extends in an axial direction in a cylindrical shape. The portion of the side cover portion 120 opposite to the end plate 110 in the axial direction overlaps with the frame 40 in the axial direction, and a gap is provided between the inner surface of the side cover portion 120 and the outer surface of the frame 40. 110b is formed.

When the cross-sectional shape of the frame 40 is circular, the shape of the end plate 110 is circular as described above, but is not limited to circular. That is, it is appropriate to determine the shape according to the cross-sectional shape of the frame 40 so that the size of the gap 110b is substantially constant in the circumferential direction. At this time, when the fins are formed in a range overlapping in the axial direction, the gap dimension between the top of the fin and the inner surface of the side cover portion 120 is set as the dimension of the gap 110b.

FIG. 2 is a conceptual perspective view showing the configuration of the outer fan and the outer fan cover of the fully enclosed external fan type rotary electric machine according to the embodiment. Further, FIG. 3 is a perspective view showing the configuration of the outer fan cover.

The outer fan cover 100 has a plurality of side plate holding portions 130, a plurality of connecting members 140, and a plurality of support members 150 in addition to the end plate 110 and the side surface cover portion 120 described above.

The end plate 110 and the side cover portion 120 form a curved surface that divides the space around the outer fan 55 into a space inside the outer fan cover 100 and a space outside the outer fan cover 100. Further, the side plate holding portion 130, the connecting member 140, and the supporting member 150 have a function of supporting the end plate 110 and the side cover portion 120 and transmitting their own weights to the frame 40.

The plurality of side plate holding portions 130 are substantially annular structures, and are provided at three locations at intervals in the axial direction, and each is arranged with its central axis parallel to the rotation axis and substantially coaxially. ing. The number of side plate holding portions 130 installed may be two or three or more.

The plurality of connecting members 140 extend in the axial direction and are arranged at intervals in the circumferential direction. The plurality of connecting members 140 connect the plurality of side plate holding portions 130 to each other. The plurality of connecting members 140 and the plurality of side plate holding portions 130 connected to each other form one cylindrical cage-shaped shape.

The plurality of support members 150 connect the plurality of connecting members 140 having a basket shape and the plurality of side plate holding portions 130 to the frame 40 with their axes horizontal. Specifically, each of the plurality of support members 150 has a rectangular plate shape, one side of which is connected to the connecting member 140, and the other side of which is connected to the outer surface of the frame 40. The shape of the support member 150 is not limited to the rectangular plate shape, and may be another shape. Further, it may be tubular as long as it extends in the axial direction and has a certain width.

FIG. 4 is a conceptual cross-sectional view showing a normal mounting state of the side cover portion of the outer fan cover according to the embodiment. FIG. 5 is a conceptual cross-sectional view showing a state of the side cover portion when the upper portion of the outer fan cover is opened. Further, FIG. 6 is a conceptual cross-sectional view showing a state of the side plate when the lower part of the outer fan cover is opened. In each figure, the side plate holding portion 130 and the connecting member 140 are indicated by solid lines, and the side cover portion 120 is indicated by a broken line for easy understanding in the illustration.

The side cover 120 is divided into two groups that are symmetrical with respect to the central vertical plane. Here, the central vertical plane is a vertical plane including the central axis of a coupling in which a plurality of connecting members 140 and a plurality of side plate holding portions 130 are connected to each other to form a cylindrical cage shape, that is, left and right. It is a vertical plane in the center. Each group has an upper side plate 121 and a lower side plate 122.

On the upper side of each upper side plate 121, an upper side plate joint portion 121a extending in the axial direction is provided. The upper side plate connecting portion 121a is detachable and detachable so as to be in close contact with the upper partition member 135 described later.

A sealing member 123 extending in the axial direction is attached to the outside of the upper portion of each lower side plate 122. Further, on the upper side of each lower side plate 122, a lower side plate connecting portion 122a extending in the axial direction is provided. The lower side plate connecting portion 122a is detachable and detachable so as to be in close contact with the upper partition member 135, which will be described later. Further, the lower side of each lower side plate 122 can be connected to the lower partition member 134 described later so as to be in close contact with each other.

The connecting member 140 has a rectangular cross section and extends in a rod shape in the axial direction. 4 to 6 show a case where four connecting members 140 are provided. Further, a lower partition member 134 extending in the axial direction is provided at the lowermost portion, and an upper partition member 135 extending in the axial direction is provided at the uppermost portion.

Each side plate holding portion 130 has an inner annular member 131, a lower half inner storage member 132, a lower half outer storage member 133, and a lower partition member 134. 4 to 6 show a front view of the annular holding member 130, and each part of the annular holding member 130 has a depth, that is, a width in the axial direction. Further, as a conceptual diagram, each of the inner annular member 131, the lower half inner storage member 132, and the lower half outer storage member 133 is shown by a curved line, but each has a width in the radial direction. The axial and radial widths of the inner annular member 131, the lower half inner storage member 132, and the lower half outer storage member 133 are required to ensure in-plane and out-of-plane bending rigidity, respectively. Has dimensions.

The inner annular member 131 is an annular member. In the lower half inner storage member 132 and the lower half inner storage member 132, the lower half inner storage member 132 is first arranged on the radial outer side of the lower half of the inner annular member 131, and further lower on the outer side in the radial direction. The semi-outer storage member 133 is arranged. As a result, an arc-shaped inner receiving portion 132a is formed which is sandwiched between the inner annular member 131 and the lower half inner storage member 132 in the radial direction and is partitioned by the lower partition member 134 at the lowermost portion. Further, in the radial direction, an arc-shaped outer receiving portion 133a is formed which is sandwiched between the lower half inner storage member 132 and the lower half outer storage member 133 and is partitioned by the lower partition member 134 at the lowermost portion.

Each inner receiving portion 132a can store each upper side plate 121. Further, each outer receiving portion 133a can store each lower side plate 122.

As shown in FIG. 4, the upper side plate 121 is connected to the upper partition member 135 in the normal mounting state. Further, the lower side plate 122 is connected to the lower partition member 134. The upper side plate 121, the lower side plate 122, and the seal member 123 sandwiched between them form a side cover portion 120 that covers the radial outside of the outer fan 55.

When accessing the outer fan 55 from above for maintenance or the like, as shown in FIG. 5, the upper side plate 121 is rotated around the upper side plate 121 by disconnecting the upper side plate joint portion 121a from the upper partition member 135. It is slid in the direction and stored in the inner receiving portion 132a. As a result, the upper part of the outer fan 55 on the outer side in the radial direction is in an open state, leaving the inner annular member 131. As a result, the outer fan 55 can be easily accessed from above. It is also possible to remove only one upper side plate joint portion 121a and open only one side.

When accessing the outer fan 55 from below, as shown in FIG. 6, the lower side plate 122 is slid in the circumferential direction, and the lower side plate connecting portion 122a is connected to the upper partition member 135 above. As a result, the lower part of the outer fan 55 on the outer side in the radial direction is in an open state, leaving the inner annular member 131. As a result, the outer fan 55 can be easily accessed from below. In FIG. 6, both of the lower side plates 122 are moved upward, but it is also possible to move only one of them.

As described above, according to the present embodiment, the outer fan cover of the fully enclosed external fan type rotary electric machine can be easily handled.

[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 of a cage type induction motor is shown as an example of the fully enclosed fan-shaped rotary electric machine, but the present invention is not limited to this, and a winding type induction type rotary electric machine or a synchronous rotary electric machine may be used.

Further, in the embodiment, the case where the inner fan 15 is mounted between the rotor core 12 and the anti-coupling side bearing 30b is shown, but the inner fan 15 is the rotor core 12 and the anti-coupling side bearing 30a. It may be installed in between. Alternatively, it may be attached to both sides of these.

Further, in the embodiment, the case where the side cover portion 120 has two parts of the upper side plate 121 and the lower side plate 122 on each of the left and right sides is shown as an example, but if there are a plurality of parts, it is also possible to have three or more parts. good.

Further, the embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments and modifications thereof are included in the scope and the gist of the invention as well as the invention described in the claims and the equivalent scope thereof.

10 ... Rotor, 11 ... Rotor shaft, 11a ... Coupling, 12 ... Rotor core, 13 ... Conductor, 15 ... Inner fan, 20 ... Stator, 21 ... Stator core, 22 ... Stator winding, 30a ... Coupling side bearing, 30b ... Anti-coupling side bearing, 40 ... Frame, 40a ... Closed space, 40b ... Heat generating side space, 40c ... Passage space, 41 ... Frame ventilation path, 42 ... Inlet opening, 43 ... Exit opening, 45a ... Coupling side bearing bracket, 45b ... Anti-coupling side bearing bracket, 55 ... Outer fan, 100 ... Outer fan cover, 110 ... End plate, 110a ... Suction port, 110b ... Gap, 120 ... Side cover, 121 ... Upper side plate, 121a ... upper side plate joint, 122 ... lower side plate, 122a ... lower side plate joint, 123 ... seal member, 130 ... side plate holding part, 131 ... inner annular member, 132 ... lower half inner storage member, 132a ... inner receiving part, 133 ... Lower half outer storage member 133a ... Outer bearing part, 134 ... Lower compartment member, 135 ... Upper compartment member, 140 ... Connecting member, 150 ... Support member, 200 ... Fully enclosed external fan-shaped rotary electric machine

Claims (6)

A rotor shaft having a rotor shaft extending in the horizontal direction and rotatably supported, and a rotor having a rotor core provided on the radial outer side of the rotor shaft.
A stator having a cylindrical stator core provided on the radial outer side of the rotor core and a stator winding penetrating the stator core in the axial direction.
A frame arranged outside the stator in the radial direction and accommodating the rotor core and the stator, and
Two bearings that support the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core in between,
Two bearing brackets that are brought close to each other to close both ends of the frame in the axial direction and support each of the bearings.
An external fan attached to one axially outer side of the bearing bracket of the rotor shaft to supply outside air to the radial outer surface of the frame.
The outer fan is covered so as to form a flow path of the outside air to the radial outer surface of the frame, the end plate on which the outside air suction port is formed, and the side cover portion arranged on the radial outer side of the outer fan. With an outer fan cover,
With
The side cover portion has two groups symmetrical with respect to a vertical plane passing through the center of rotation of the rotor shaft, and each group has a plurality of portions that can move in the circumferential direction. Fully enclosed fan-shaped rotary electric machine. The side cover portion has an upper side plate and a lower side plate, and has an upper side plate and a lower side plate.
The outer fan cover is
A plurality of side plate holding portions, which are arranged at intervals in the axial direction and in which the upper side plate and the lower side plate are formed so as to be movable in the circumferential direction, respectively.
A plurality of connecting members arranged at intervals in the circumferential direction and extending in the axial direction to support the plurality of side plate holding portions, and a plurality of connecting members.
The fully enclosed fan-shaped rotary electric machine according to claim 1. Each of the plurality of side plate holding portions
An annular inner annular member coupled to the plurality of connecting members and
A lower half inner storage member arranged on the radial outer side of the lower half of the inner annular member to form an inner receiving portion together with the inner annular member.
A lower half outer storage member which is arranged on the outer side in the radial direction of the lower half inner storage member and forms an outer receiving portion together with the lower half inner storage member.
2. The fully enclosed fan-shaped rotary electric machine according to claim 2. An upper partition member for connecting the upper ends of the plurality of side plate holding portions is further provided.
A detachable joint with the upper partition member is provided on the upper side of each of the upper side plates.
A detachable joint with the upper partition member is provided on the upper side of each of the lower side plates.
The fully enclosed fan-shaped rotary electric machine according to claim 2 or 3. The fully enclosed fan-shaped rotary electric machine according to any one of claims 2 to 4, wherein a sealing member extending in the axial direction is provided on the inner surface near the upper side of each of the lower side plates. Outside in a fully enclosed fan-shaped rotary electric machine including a rotor having a rotor shaft, a stator, a frame, two bearings, two bearing brackets, and an outer fan that supplies outside air to the radial outer surface of the frame. It ’s a fan cover,
An end plate that covers the outer fan so as to form a flow path of the outside air to the radial outer surface of the frame and has a suction port for the outside air.
The side cover portion arranged on the outer side in the radial direction of the outer fan, and
Have,
The side cover portion has two groups symmetrical with respect to a vertical plane passing through the center of rotation of the rotor shaft, and each group has a plurality of portions that can move in the circumferential direction.
The outer fan cover is characterized by that.

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