JP7219114B2 - Rotating electric machine - Google Patents

Description

The present invention relates to a rotating electric machine such as a motor and a generator, and more particularly to a rotating electric machine provided with a heat exchanger for exchanging heat with internal circulating air that cools a stator and a rotor in the upper part of the main body of the rotating electric machine.

An example of a general rotating electric machine having a heat exchanger for exchanging heat with internal circulating air for cooling the stator and rotor, provided in the upper portion of the rotating electric machine main body will be described with reference to FIGS. 7 and 8. FIG.
FIG. 7 is a schematic configuration diagram showing the overall configuration of a general rotary electric machine, and FIG. 8 is an explanatory diagram explaining the flow of internal circulating air for cooling the stator and rotor.

In FIG. 7, reference numeral 1 denotes a main body (rotating electric machine main body) of a rotating electric machine 100 such as a motor (electric motor) or a generator. ). 4a is the shaft of the rotor 4, and 5 are bearings provided on both sides of the housing 2 for supporting the shaft 4a.

6 exchanges heat between the internal circulation air (internal circulation refrigerant) heated by cooling the stator 3 and the rotor 4 and the external air (external refrigerant) that is cooling air introduced from the outside, A heat exchanger that cools circulating air with outside air. One end of the heat exchanger 6 is connected to an intake duct 7 for introducing outside air, and the other end is connected to an exhaust duct 8 for discharging the outside air after passing through the heat exchanger 6. It is connected.

A large number of pipes (heat transfer tubes) 6a are arranged in the heat exchanger 6 so that the external air introduced from the intake duct 7 flows to the exhaust duct 8 side. An impeller 9 is provided in the air intake duct 7. The impeller 9 is attached to the end of the shaft 4a of the rotor 4 and is rotated as the rotor 4 rotates. 10 is an air intake provided in the intake duct 7, and 11 is a partition plate for partitioning the suction side and the discharge side of the impeller 9. As shown in FIG.

When the impeller 9 rotates, external air is taken into the intake duct 7 from the air intake port 10 and sucked into the impeller 9 as indicated by the solid line arrow a. The air sucked into the impeller 9 is pressurized by the impeller 9 and discharged radially as indicated by the solid line arrow b to flow through the intake duct 7 . When this air reaches the heat exchanger 6, it flows into each of the pipes 6a arranged in the heat exchanger 6, passes through the pipes 6a, reaches the exhaust duct 8, and It is discharged to the outside such as the atmosphere from the duct 8 .

When the air introduced from the outside flows through the pipe 6a of the heat exchanger 6, the stator 3 and the rotor 4 in the main body 1 of the rotating electrical machine are cooled, and heat is exchanged with the internal circulating air whose temperature has risen. The air is cooled by the air introduced from the outside and circulated to the stator 3 and rotor 4 side again.

This configuration will be described in detail with reference to FIG. FIG. 8 is a schematic diagram for explaining how internal circulating air flows inside the rotary electric machine main body 1 and inside the heat exchanger 6. As shown in FIG.
A rotor 4 is disposed on the inner diameter side of a stator 3 in the main body 1 of the rotary electric machine, and an inner fan 12 constituted by an axial fan or the like is provided on each shaft 4a on both sides of the rotor 4. . On the other hand, the rotor 4 has axial passages 4b and a number of radial passages (not shown) communicating with the axial passages 4b on the inner peripheral side thereof. A large number of radial passages through which the internal circulation air passes are formed in the axial direction.

When the rotor 4 rotates, the air (internally circulated air) in the housing 2 is pressurized by the inner fan 12 and flows in the axial direction. It flows through the connected radial flow passages to cool the rotor 4 and then flows through the radial flow passages formed in the stator 3 . The air pressurized by the inner fan 12 flows through a gap (air gap) between the stator 3 and the rotor 4, and from there flows into a large number of radial flow passages provided in the axial direction of the stator 3. . The stator 3 is also cooled by the air flowing through the radial flow paths of the stator 3 .

The air that has cooled the stator 3 and the rotor 4 flows into the heat exchanger 6 as indicated by solid line arrows c and d in FIG. pass between the pipes 6a (see FIG. 6). When the high-temperature internal circulating air passes through the heat absorbing portion 13, it exchanges heat with the low-temperature external air flowing through the pipe 6a. The internal circulation is repeated in which the pressure is increased and supplied to the rotor 4 and the stator 3 again.

In FIG. 7, reference numeral 14 denotes an opening through which the shaft 4a of the rotor 4 passes, and 15 denotes a gap between the opening 14 and the shaft 4a. The shaft 4a is configured to be rotatable without coming into contact with the intake duct 7. As shown in FIG. Further, the outer surface of the housing 2 is provided with an auxiliary equipment storage box (not shown) for storing power supply terminals, electric wires connected thereto, and the like.

As this kind of prior art, there is the one described in Japanese Patent Application Laid-Open No. 2000-152562 (Patent Document 1). Further, examples of the seal structure for the portion through which the shaft penetrates include those described in Japanese Patent Application Laid-Open No. 2016-16802 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2013-209974 (Patent Document 3).

JP-A-2000-152562 Japanese Unexamined Patent Application Publication No. 2016-16802 JP 2013-209974 A

In the above patent document 1 and the one described with reference to FIG. 7, the gap 15 is formed in the portion where the shaft 4a of the rotor 4 passes through the intake duct 7. As shown in FIG. Further, in the air intake duct 7 , noise such as blade passing frequency sound generated by the impeller 9 and turbulent sound due to a sharp deflection of the air flowing in the air intake duct 7 is generated.

A gap 15 between the shaft 4a of the rotor 4 and the opening 14 is close to noise sources such as the impeller 9 and the deflector, and is likely to be a propagation path of noise to the outside. Therefore, by making the gap 15 as small as possible and increasing the reflection of sound from the vicinity of the gap 15 into the air intake duct 7, the noise leaking to the outside of the air intake duct 7 is reduced, thereby realizing a low-noise rotary electric machine. 100 is possible.

Therefore, in order to prevent the noise generated inside the air intake duct 7 from propagating to the outside of the air intake duct 7, it is conceivable to take measures to reduce the gap 15 between the shaft 4a and the opening 14. FIG. Further, as a means for reducing the gap 15, it is conceivable to provide a sealing means as described in Patent Document 2 and Patent Document 3 above.

Patent Document 2 describes disposing a multi-layered seal ring having a divided portion on the rotary shaft in order to reduce the gap between the shaft and the opening. Further, Patent Document 3 describes a configuration in which an arc-shaped seal ring that can be moved toward the center of the shaft by a thermoswitch (driving member) is arranged on the outer circumference of the shaft.

The structure of Patent Document 2 is complicated because it is necessary to dispose seal rings having one or more divided portions in the circumferential direction in two or more layers. In addition, because of the structure in which the seal ring is fixed to the shaft with a binding band, the unbalance of the shaft tends to increase.

Further, in the above patent document 3, during normal operation, the seal ring is separated from the shaft so as not to hinder the rotation of the shaft, and when the temperature becomes higher than that during normal operation, the seal ring is pressed against the shaft by a thermoswitch. to ensure airtightness between the shaft and the seal ring. For this reason, the seal ring cannot be fixed and sealed without contacting the shaft at an arbitrary position. cannot be kept small. In addition, driving members such as thermoswitches are required to drive the seal ring, which complicates the structure.

Furthermore, none of the above patent documents considers fixing the seal ring at an arbitrary position without contacting the shaft so that the gap between the opening and the shaft can be arbitrarily adjusted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electric machine which has a simple structure and is capable of arbitrarily adjusting the gap between the shaft of the rotor and the opening of the air intake duct, thereby reducing the noise leaking from the air intake duct to the outside. That's what it is.

In order to achieve the above object, the present invention provides a rotary electric machine main body having a stator and a rotor inside a housing, a heat exchanger installed outside the housing, and introducing outside air into the heat exchanger. An air intake duct, an impeller provided in the air intake duct and rotated by the shaft of the rotor, and an opening formed in the air intake duct through which the shaft passes, cooling the stator and the rotor. In the rotary electric machine configured such that the internally circulated refrigerant is cooled by exchanging heat with the external refrigerant flowing into the heat exchanger, a sound insulation seal that reduces a gap between the opening and the shaft is provided in the air intake duct. , wherein the sound insulation seal includes an upper arc seal arranged on the upper side and having an elongated positioning groove, a lower arc seal arranged on the lower side, and a fixing for fixing the upper arc seal to the intake duct A screw and an adjusting screw for attaching the lower arc seal to the upper arc seal and adjusting the gap between the upper arc seal and the lower arc seal are provided.

Another feature of the present invention is a rotating electric machine main body including a stator and a rotor in a housing, a heat exchanger installed outside the housing, and an intake duct for introducing outside air to the heat exchanger. an impeller provided in the air intake duct and rotated by the shaft of the rotor; and an opening formed in the air intake duct through which the shaft penetrates. The refrigerant becomes an internally circulating refrigerant that circulates in the housing and the heat exchanger, and the internally circulating refrigerant is cooled by exchanging heat with the external refrigerant that flows from the intake duct into the heat exchanger by the impeller. In the rotating electric machine constructed, a sound insulation seal is provided in the air intake duct to reduce the gap between the opening and the shaft, and the sound insulation seal is disposed on the upper side and has an elongated hole-shaped positioning groove. a lower arc seal disposed below; a fixture for fixing the upper arc seal to the intake duct; attaching the lower arc seal to the upper arc seal; adjustment means capable of adjusting the interval, a protrusion formed at one circumferential end of the upper arc seal and the lower arc seal, and at the other circumferential end of the upper arc seal and the lower arc seal It is provided with a concave portion formed at a position facing the convex portion.

According to the present invention, it is possible to obtain a rotary electric machine that can arbitrarily adjust the gap between the rotor shaft and the opening of the air intake duct with a simple structure, and that can reduce noise leaking from the air intake duct to the outside. be.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows Example 1 of the rotary electric machine of this invention. FIG. 2 is an exploded perspective view of a portion of the sound insulation seal shown in FIG. 1; FIG. 3 is an enlarged perspective view of the vicinity of the tightening surface shown in FIG. 2; FIG. 2 is a rear view of the sound insulation seal shown in FIG. 1; FIG. 2 is a front view of the sound insulation seal shown in FIG. 1; FIG. 6 is a front view of the sound insulation seal shown in FIG. 1 and is a diagram for explaining a case where the shaft diameter is larger than that in FIG. 5 ; It is a front view showing a general rotary electric machine, and is a diagram showing only an air intake duct portion in a cross section. FIG. 4 is an explanatory diagram illustrating the flow of internal circulating air in a general rotary electric machine;

A specific embodiment of the rotating electrical machine of the present invention will be described below with reference to the drawings. It should be noted that portions denoted by the same reference numerals in each figure indicate the same or corresponding portions.

Embodiment 1 of the rotating electric machine of the present invention will be described with reference to FIGS. 1 to 6. FIG. The basic configuration of the rotating electrical machine 100 is similar to that of the general rotating electrical machine shown in FIGS. 7 and 8, and the same components are denoted by the same reference numerals.

FIG. 1 is a front view showing the rotating electric machine of the first embodiment. The rotary electric machine 100 of the first embodiment also has a structure of the rotary electric machine main body 1 similar to that of the general rotary electric machine shown in FIGS. ) is provided on the upper part of the housing 2 of the rotary electric machine main body 1 for cooling the internally circulating refrigerant such as the air for cooling the rotary electric machine main body 1 . In addition, an intake duct 7 for introducing external air (external refrigerant) such as air in the atmosphere to the heat exchanger 6 and an exhaust duct 8 for discharging the external air flowing out from the heat exchanger 6 are provided.

A shaft 4a of the rotor 4 is rotatably supported by a bearing 5, and one end thereof passes through an opening 14 (see FIG. 7) formed in the air intake duct 7 and is connected to the impeller 9 in the air intake duct. It is

The shaft 4a of the rotor 4 of the rotating electrical machine 100 is connected to the rotating shaft of a driven device (for example, a pump) that is driven by the rotating electrical machine 100 so as to be aligned with each other. Therefore, the housing 2 of the rotary electric machine 100 is fixed to an installation surface such as a foundation or a frame to prevent relative displacement between the shaft 4a of the rotor 4 and the rotating shaft of the driven device during operation. there is

The stator 3 is fixed to the inside of the housing 2, and the heat exchanger 6, power supply terminals, electric wires, etc. are stored outside the housing 2. ) etc. are also provided. The heat exchanger 6 and the accessory storage box are detachably fixed to the housing 2 with bolts or the like.

Inside the housing 2 and inside the heat exchanger 6, flow paths are formed for circulating the internally circulating refrigerant such as air for cooling the stator 3 and the rotor 4 (see FIG. 8). . Inside the heat exchanger 6 , heat is exchanged between the internally circulating refrigerant and the external air introduced from the air intake duct 7 .

That is, the external air is led from an intake duct 7 arranged upstream of the heat exchanger 6, passes through a large number of pipes (heat transfer tubes) 6a arranged in the heat exchanger 6, and then flows through the heat exchanger 6. It is discharged from an exhaust duct 8 arranged on the downstream side. The internally circulating refrigerant, which has reached a high temperature by cooling the stator 3 and the rotor 4, enters the heat exchanger 6 and passes through the space between the pipes 6a. During this passage, the high-temperature internally circulating refrigerant exchanges heat with the low-temperature external air flowing through the pipe 6a, is cooled, and then returns to the housing 2 again.

In the first embodiment, in order to suppress leakage of noise generated in the air intake duct 7 from the opening 14 of the air intake duct 7 through which the shaft 4a of the rotor 4 penetrates, the air intake near the opening 14 is provided. A sound insulation seal 16 is provided in the duct 7. - 特許庁The sound insulation seal 16 comprises an upper arc seal 16a and a lower arc seal 16b. The upper arc seal 16a is fixed to the air intake duct 7 by a fixing screw (fixture) 17, and the lower arc seal 16b is attached to the upper arc seal 16a with an adjusting screw. It is connected to (adjusting means) 18 so as to be suspended. A convex portion 19 is formed on the rear side of the circumferential end portion of the upper arc seal 16a.

Next, a specific configuration of the sound insulation seal 16 will be described with reference to FIGS. 2 to 4. FIG. 2 is an exploded perspective view of the sound insulation seal portion shown in FIG. 1, FIG. 3 is an enlarged perspective view of the vicinity of the tightening surface shown in FIG. 2, and FIG. 4 is a rear view of the sound insulation seal 16 shown in FIG.

A gap 15 is formed between the shaft 4a of the rotor 4 and the opening 14. To reduce the gap 15, the sound insulation seal is provided on the outside air side of the intake duct 7 near the opening 14. 16 are provided. The sound insulation seal 16 includes the upper arc seal 16a, the lower arc seal 16b, the fixing screw 17 and the adjusting screw 18. As shown in FIG.

As shown in FIG. 2, the upper circular arc seal 16a is provided with a plurality of (two in this example) parallel positioning grooves 21. A fixing screw 17 is passed through the positioning grooves 21 to After being arranged on the outside air side of the air intake duct 7 , it is fixed to the air intake duct 7 with the fixing screw 17 . The positioning grooves 21 are elongated in the vertical direction, and a plurality of (two in this example) are formed in parallel. be done.

The lower arcuate seal 16b is fixed to the upper arcuate seal 16a by an adjusting screw 18 so that its position can be adjusted in the vertical direction. That is, the upper arc seal 16a is formed with a groove 22 for installing an adjusting screw and a vertical through-hole for passing the adjusting screw 18 therethrough. A threaded hole 23 for screwing the adjusting screw 18 is formed in the attached surface 24 . By adjusting the screwing amount of the adjusting screw 18 into the threaded hole 23, the lower arc seal 16b is positioned in a suspended state with respect to the upper arc seal 16a, and the upper arc seal 16a and the lower arc seal 16b are positioned. is configured to be able to adjust its position in the vertical direction.

In addition, convex portions 19 are formed on the surface of the intake duct 7 side at both circumferential ends (tightening surfaces 25) of the upper arc seal 16a, and both circumferential ends (tightening surfaces 25) of the lower arc seal 16b are formed. 24) is formed with a concave portion 20 that fits into the convex portion 19 on the surface on the intake duct 7 side. The convex portion 19 and the concave portion 20 form a spigot structure, and the convex portion 19 and the concave portion 20 are configured so as to be fitted to the tightening surfaces 24 and 25 of the upper arc seal 16a and the lower arc seal 16b.

The structure around the tightening surfaces 24, 25 will be described in more detail with reference to the enlarged perspective view shown in FIG. In this embodiment, the convex portion 19 is formed on the surface of the air intake duct 7 side at the circumferential end portion of the upper arc seal 16a, at a position on the inner diameter side. In addition, the radial width of the projection 19 is set to a width that can cover the outer diameter side of the gap 15 (the outer diameter side of the opening 14), so that the noise generated in the air intake duct 7 can be dissipated from the gap 15. The noise is reflected by the upper arc seal 16a and the lower arc seal 16b, and the convex portion 19 and the concave portion 20 so as to prevent the noise from propagating to the outside.

That is, a gap is formed between the tightening surfaces 24 and 25 in order to adjust the inner diameter of the sound insulating seal 16, and the noise that leaks from this gap is reflected by the convex and concave portions 20. It is configured to block sound by

In this embodiment, the convex portion 19 extends from the innermost diameter portion of the upper arc seal 16a toward the outer diameter direction to about half the radial width of the upper arc seal 16a (the radial width of the tightening surface 25). is set up to the position of Since it is sufficient for the convex portion to extend beyond the outer diameter side of the gap 15, the width of the convex portion may be the same as the radial width of the upper arc seal 16a.

The concave portion 20 is formed on the surface of the lower arc seal 16b on the side of the air intake duct 7 at the circumferential end of the lower arc seal 16b, at the position on the inner diameter side. That is, the concave portion 20 is formed in the portion facing the convex portion 19 on the tightening surface 24 of the lower arc seal 16b. It is formed slightly larger than the projection 19 so that it can be fitted.

FIG. 4 is a rear view of the sound insulation seal 16 shown in FIG. 2, and is a view of the sound insulation seal 16 seen from the intake duct 7 side. In FIG. 4, the position of the opening 14 of the intake duct 7 is indicated by a dashed line, and the shaft 4a of the rotor is also illustrated. As shown in FIG. 4, the gap 15 between the opening 14 of the intake duct 7 and the shaft 4a must be relatively large so as to absorb assembly errors. There was a problem that the noise leaked and the noise of the entire rotary electric machine increased.

In contrast, in this embodiment, by providing the sound insulation seal 16 in the opening 14, the gap between the inner diameter of the sound insulation seal 16 and the shaft 4a can be greatly reduced as shown in FIG. 5 and 6, even if the diameter of the shaft 4a is different, the inner diameter of the sound insulation seal 16 can be adjusted by the adjustment screw 18 according to the diameter of the shaft 4a. Therefore, even when shafts 4a having different diameters are used, it is possible to greatly reduce the gap between the inner diameter of the sound insulating seal 16 and the shaft 4a. Therefore, according to the present embodiment, most of the noise that is about to leak from the gap 15 is reflected by the sound insulating seal 16, and the leakage of the noise to the outside can be suppressed.

In addition, in this embodiment, in order to adjust the inner diameter of the sound insulating seal 16, a gap is required between the tightening surface 25 of the upper arc seal 16a and the tightening surface 24 of the lower arc seal 16b. Noise may leak. However, in this embodiment, a protrusion 19 and a recess 20 in which the protrusion 19 is fitted are formed on the inner diameter side of the tightening surfaces 24 and 25 (the circumferential ends of the upper and lower arc seals). Therefore, the noise that is about to leak from the gap 15 can be reflected by the convex portion 19 and the concave portion 20 as well.

Therefore, according to this embodiment, the inner diameter of the sound insulation seal 16 can be arbitrarily adjusted by the adjusting screw 18, so that the gap 15 through which noise leaks can be greatly reduced, and furthermore, the tightening surfaces 24 and 25 can be reduced. The effect of reducing the noise leaking from the gap is also obtained.

The convex portion 19 provided on the upper circular arc seal 16a is not limited to the side of the air intake duct 7, and may be provided on the side opposite to the air intake duct 7, or may be provided in the central portion in the axial direction. When the convex portion 19 is provided in the axially central portion of the upper arc seal 16a, the concave portion provided in the lower arc seal 16b has a hole shape.
Alternatively, the convex portion 19 may be provided on the lower arc seal 16b and the concave portion 20 may be provided on the upper arc seal 16a.

Furthermore, although the sound insulating seal 16 has been described as being divided into two, one upper circular arc seal 16a and one lower circular arc seal 16b, it is not limited to being divided into two, and may be divided into three or more. be. For example, the sound insulation seal 16 may be composed of one upper arc seal 16a and a plurality of (for example, two) lower arc seals 16b.

Next, adjustment of the mounting position of the sound insulation seal 16 in the first embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 and 6 are front views of the sound insulation seal 16, and the shaft 4a of the rotor 4 is also illustrated in these figures. It also shows a state of fixing to an intake duct (not shown) using fixing screws 17 .

FIG. 5 shows the case where the diameter of the shaft 4a is small. In this case, the fixing screw 17 is used to position the upper arc seal 16a in the vertical direction in order to reduce the gap between the shaft 4a and the inner diameter of the sound insulation seal 16. FIG. That is, by vertically moving the position of the positioning groove 21 formed in the upper arc seal 16a with respect to the fixing screw 17, the inner diameter of the upper arc seal 16a is adjusted and positioned so as to be sufficiently close to the shaft 4a. Fix by tightening the fixing screw 17 . At this time, the gap between the upper circular arc seal 16a and the shaft 4a is determined in consideration of the vibration and displacement of the shaft 4a during operation.

Next, the adjusting screw 18 is used to position the lower arc seal 16b in the vertical direction. That is, the adjustment screw 18 is adjusted so that the inner diameter of the lower arcuate seal 16b is sufficiently close to the shaft 4a for positioning. In this embodiment, the lower arc seal 16b is held in a suspended state by the adjusting screw 18 due to its gravity. Therefore, if the adjusting screw 18 is screwed into the screw hole 23 (see FIG. 2), the lower arc seal 16b will move upward, and if the adjusting screw 18 is turned in the loosening direction, the lower arc seal 16b will move downward. , the position of the lower arc seal 16b can also be determined arbitrarily and easily.

When the diameter of the shaft 4a is small, the gap between the tightening surfaces 24 and 25 is as small as S1, as shown in FIG. On the other hand, when the diameter of the shaft 4a is large, as shown in FIG. 6, the gap between the tightening surfaces 24 and 25 is increased to S2. Therefore, according to the present embodiment, even if the diameter of the shaft 4a is different, the gap between the sound insulation seal 16 and the shaft 4a can be arbitrarily adjusted, and noise in the intake duct 7 can be suppressed from leaking to the outside. be able to.

In the above-described embodiment, two positioning grooves 21 are formed in parallel in the vertical direction, but the positioning grooves 21 are not limited to being formed in the vertical direction, and may be formed in an oblique direction. In this case, it is possible to adjust the fixed position of the upper arc seal 16a obliquely. Further, if the positioning groove 21 formed in the vertical direction is formed to have a width slightly larger than the diameter of the cylindrical portion of the fixing screw 17, the position in the vertical direction can be adjusted and the position in the horizontal direction can also be finely adjusted.

Next, the operation of the rotating electric machine 100 of this embodiment will be described.
The rotor 4 (see FIG. 8) of the rotary electric machine 100 shown in FIG. 1 is rotated by electric power. When the rotor 4 rotates, the impeller 9 attached to the end of the shaft 4a also rotates. high pressure. Therefore, external air flows into the impeller 9 from the upstream side of the intake duct 7 and external air is discharged from the downstream side of the impeller 9 . This external air then flows into the heat exchanger 6 and flows through the pipes (heat transfer tubes) 6 a that are arranged in the heat exchanger 6 .

On the other hand, the heat generated by the stator 3 (see FIG. 8) and the rotor 4 is absorbed by the internally circulating refrigerant (internally circulating air), and this internally circulating refrigerant flows into the heat exchanger 6 and flows through the pipe 6a. flow over the outer surface. At this time, the internally circulating refrigerant is cooled by exchanging heat with the external air flowing through the pipe 6a. The external air whose temperature has risen by drawing heat from the internally circulating refrigerant flows through the exhaust duct 8 and is then discharged to the atmosphere. The flow of internally circulating coolant is the same as in the general rotating electric machine described with reference to FIG.

In the air intake duct 7 , noises such as blade passing frequency noise generated by the impeller 9 and turbulence noise caused by a sharp deflection of the air flowing through the air intake duct 7 are generated. The generated noise is radiated from the openings of the intake duct 7 and the exhaust duct 8, but the gap 15 between the shaft 4a of the rotor 4 and the opening 14 receives the noise from the impeller 9 and the deflector. It is close to the source and tends to be a propagation path for noise to the outside. Therefore, by making the gap 15 as small as possible and increasing the reflection of sound from the vicinity of the gap 15 into the air intake duct 7, the noise leaking to the outside of the air intake duct 7 can be reduced. Electric machine 100 becomes possible.

In this embodiment, since the sound insulation seal 16 is provided in the gap 15 between the shaft 4a of the rotor 4 and the opening 14, the area of the gap 15 can be reduced. Further, according to this embodiment, the area of the gap can be reduced without improving the processing accuracy of the opening 14 formed in the air intake duct 7, so that the cost can be reduced and the assembling efficiency can be improved. Therefore, since the amount of reflection of sound in the vicinity of the gap 15 can be increased with an inexpensive structure, a rotating electrical machine capable of reducing noise leaking from the inside of the exhaust duct 8 to the outside can be obtained.

When the shaft 4a of the rotor 4 is supported by a slide bearing, the shaft 4a is floated and supported by an oil film. In this case, it is necessary to position the sound insulation seal 16 in consideration of the floating amount with respect to the rotating shaft position at rest. On the other hand, by adopting the structure of this embodiment, a spacer having a thickness corresponding to the floating of the shaft 4a is interposed between the shaft 4a and the upper arc seal 16a at the time of assembly, and then the upper arc seal 16a is inserted. is positioned and fixed, the gap between the sound insulating seal 16 and the shaft 4a can be easily adjusted in consideration of the amount of floating caused by the oil film of the shaft 4a.

Further, when the shaft 4a is supported by a slide bearing, the trajectory of the contact vibration changes according to the rotation speed of the shaft 4a. For this reason, the sound insulation seal 16 is arranged so that the gap between the shaft 4a and the shaft 4a is slightly large. If the sound insulation seal 16 comes into contact with the sound insulation seal 16, the sound insulation seal 16 is scraped off to prevent damage to the shaft 4a. Therefore, by making the sound insulating seal 16 made of resin, it is possible to further reduce the gap between the sound insulating seal 16 and the shaft 4a.

As the material of the sound insulation seal 16, a resin having a high density is preferable because it can enhance the sound insulation effect, and a resin material mixed with talc (talc) or metal powder is preferable. It is also preferable to use POM (polyacetal) as the resin material. In addition, resins such as ABS resin and PP (polypropylene) may be used.

In addition, in this embodiment, an example in which the inner peripheral surface of the sound insulating seal 16 is formed in a simple circular arc shape has been described. ) may be used. By configuring the inner peripheral surface of the sound insulation seal 16 as an annular uneven portion in this way, even if the shaft 4a and the sound insulation seal 16 come into contact with each other, the contact area becomes small and the contact rigidity becomes low. Damage to 16 and shaft 4a can be suppressed.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, in the above embodiments, the case where the rotary electric machine is an electric motor has been described, but the same can be applied to the case where the rotary electric machine is a generator. Moreover, in the above embodiment, the fixing screw and the adjusting screw are used to attach the sound insulating seal.
Furthermore, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations.

1: rotary electric machine main body, 2: housing,
3: stator, 4: rotor, 4a: shaft, 4b: axial passage,
5: bearing, 6: heat exchanger, 6a: pipe (heat transfer tube),
7: intake duct, 8: exhaust duct, 9: impeller,
10: air intake, 11: partition plate, 12: inner fan, 13: heat absorbing part,
14: opening, 15: gap,
16: sound insulation seal, 16a: upper arc seal, 16b: lower arc seal,
17: Fixing screw (fixture), 18: Adjusting screw (adjusting means),
19: convex portion, 20: concave portion,
21: positioning groove, 22: groove,
23: screw hole, 24, 25: tightening surface, 100: rotary electric machine.

Claims (15)

A rotary electric machine main body including a stator and a rotor in a housing, a heat exchanger installed outside the housing, an air intake duct for introducing external air to the heat exchanger, and a heat exchanger provided in the air intake duct. an impeller rotated by the shaft of the rotor ; and an opening formed in the air intake duct through which the shaft passes; In a rotating electric machine configured such that an internally circulating refrigerant to be cooled is cooled by exchanging heat with an external refrigerant flowing into a heat exchanger,
A sound insulation seal is provided in the air intake duct to reduce a gap between the opening and the shaft;
The sound insulation seal is
an upper arc seal disposed on the upper side and having an elongated hole-shaped positioning groove;
a lower arc seal disposed on the underside;
a fixing screw for fixing the upper arc seal to the intake duct;
A rotary electric machine, comprising: an adjusting screw capable of attaching the lower arcuate seal to the upper arcuate seal and adjusting a gap between the upper arcuate seal and the lower arcuate seal. In the rotary electric machine according to claim 1,
A rotary electric machine, wherein the positioning grooves are elongated in the vertical direction and are formed in parallel. A rotary electric machine main body including a stator and a rotor in a housing, a heat exchanger installed outside the housing, an air intake duct for introducing external air to the heat exchanger, and a heat exchanger provided in the air intake duct. An impeller rotated by the shaft of the rotor, and an opening formed in the intake duct through which the shaft passes, wherein the rotor has a horizontal axis, and when the rotor rotates, Refrigerant in the housing becomes internally circulating refrigerant that circulates in the housing and in the heat exchanger, and this internally circulating refrigerant exchanges heat with the external refrigerant flowing into the heat exchanger from the air intake duct by the impeller and is cooled. In a rotating electrical machine configured to
A sound insulation seal is provided in the air intake duct to reduce a gap between the opening and the shaft;
The sound insulation seal is
an upper arc seal disposed on the upper side and having an elongated hole-shaped positioning groove;
a lower arc seal disposed on the underside;
a fixture that secures the upper arc seal to the intake duct;
adjusting means for attaching the lower arc seal to the upper arc seal and adjusting the interval between the upper arc seal and the lower arc seal;
a convex portion formed at one circumferential end of the upper arc seal and the lower arc seal;
A rotary electric machine, comprising: a concave portion formed at a position facing the convex portion at the other circumferential end portion of the upper arc seal and the lower arc seal. In the rotary electric machine according to claim 3,
A rotary electric machine, wherein the positioning groove is formed in a vertical direction. The rotating electric machine according to claim 3 or 4,
A rotary electric machine, wherein a plurality of the positioning grooves are formed in parallel. In the rotating electric machine according to any one of claims 3 to 5,
The rotary electric machine, wherein the sound insulation seal is composed of one upper arc seal and one lower arc seal. In the rotating electric machine according to any one of claims 3 to 5,
The rotary electric machine, wherein the sound insulation seal is composed of one upper arc seal and a plurality of lower arc seals. In the rotating electric machine according to any one of claims 3 to 5,
The adjusting means for adjusting the gap between the upper arc seal and the lower arc seal is an adjusting screw provided vertically on the upper arc seal, and this adjusting screw is inserted into a threaded hole formed in the circumferential end of the lower arc seal. A rotary electric machine, wherein the gap between the upper arc seal and the lower arc seal can be adjusted by adjusting the amount of screwing into the upper and lower arc seals. In the rotary electric machine according to claim 8,
A rotary electric machine, wherein the upper arc seal is formed with a groove in which the adjustment screw is installed and a vertical through hole through which the adjustment screw is passed. In the rotating electric machine according to any one of claims 3 to 5,
A fixing tool for fixing the upper arc seal to the air intake duct is a fixing screw, and the position of the upper arc seal is fixed to the air intake duct by the positioning groove and the fixing screw so that the position of the upper arc seal can be adjusted. electric machine. In the rotating electric machine according to any one of claims 3 to 5,
The rotary electric machine, wherein the convex portion is formed on the intake duct side at one circumferential end of the upper arc seal and the lower arc seal. In the rotary electric machine according to claim 11,
The rotary electric machine, wherein the convex portion is formed on the inner diameter side of the upper circular arc seal or the lower circular arc seal, and the outer diameter side of the convex portion is formed radially outward from the opening. In the rotary electric machine according to claim 12,
The convex portion is provided from the innermost portion of the upper circular arc seal or the lower circular arc seal toward the outer diameter direction to a position about half of the radial width of the upper circular arc seal or the lower circular arc seal. Rotating electric machine. In the rotary electric machine according to claim 11,
A rotary electric machine, wherein the convex portion is formed on an upper arc seal. In the rotating electric machine according to any one of claims 3 to 5,
A rotary electric machine, wherein an inner peripheral surface of the sound insulation seal is provided with an annular concave-convex portion in an axial direction.

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