JP2013090469A - Canned motor and vacuum pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a canned motor capable of sufficiently cooling a core of a stator and a coil end with a simple constitution.SOLUTION: A canned motor 1 according to the present invention has: a casing 2; a can 5 with an airtight structure provided in the case 2 and housing a rotator 10 mounted to a shaft 9; and a stator 4 arranged in a stator space 4A isolated by the can 5 in the casing 2. The casing 2 is provided with: first vent holes 11 communicating with the stator space 4A and introducing air outside the casing 2 to the stator space 4A; and a fan 13 for blowing air to the first vent holes 11. Second vent holes 12 for exhausting air in the casing 2 are provided at an opposite side position of the casing 2 across the can 5.

Description

  The present invention relates to a canned motor used for driving a vacuum pump, for example.

Conventionally, a canned motor in which a rotor portion is hermetically used is used as a motor for driving a vacuum pump.
FIG. 3 is a cross-sectional view showing an internal configuration of a conventional canned motor described in Patent Document 1. As shown in FIG.

  As shown in FIG. 3, the canned motor 101 has a cylindrical motor frame 102, one end of which is press-fitted into the side of the pump mounting flange 103 and welded, and the other end is attached to the anti-load side flange 104. It is press-fitted and welded.

  A jacket 105 is provided on the outer periphery of the motor frame 102. The jacket 105 is formed in a cylindrical shape, and is arranged with a gap A between the outer periphery of the motor frame 102.

One end of the jacket 105 is press-fitted into the pump mounting flange 103 and welded, and the other end is press-fitted into the anti-load side flange 104 and welded.
Two sockets 106 communicating with the gap A are welded to the jacket 105.

  One of these two sockets 106 is connected to a cooling water inlet pipe (not shown), and the other is connected to a cooling water outlet pipe (not shown). That is, the water cooling chamber is configured by the gap A surrounded by the outer periphery of the motor frame 102, the inner periphery of the jacket 105, the pump mounting flange 103, and the anti-load side flange 104.

A stator 107 is fixed to the inner wall of the motor frame 102, and a cylindrical can 108 is inserted into the inner cylindrical surface of the stator 107.
One end of the can 108 is press-fitted and welded to the inner diameter portion of the pump mounting flange 103, and the other end is press-fitted and welded to the anti-load side flange 104.

  An annular groove 109 is formed on the motor side surface of the pump mounting flange 103, and a closing plate 110 is press-fitted into the opening of the annular groove 109 on the stator 107 side to the inner diameter portion of the pump mounting flange 103. A void B is formed.

  The pump mounting flange 103 is provided with two plug holes 111 communicating with the gap B (one is omitted in the figure), one of which is connected to the cooling water inlet pipe described above, and the other is cooled. Connected to water outlet piping. Thus, a water cooling chamber is constituted by the gap B in the pump mounting flange 103.

A disc-shaped anti-load side cover 113 is fixed to the outer side surface of the anti-load side flange 104 with bolts 114 with an O-ring 112 interposed, and the inside of the pump chamber (not shown) and the can 108 when the vacuum pump is attached. It is comprised so that the sealing state in the inside of a room | chamber may be ensured.
A rotator 115 is provided inside the can 108, and the rotator 115 is press-fitted into a rotating shaft 116 directly connected to a rotating shaft of a vacuum pump (not shown).

  According to the canned motor 101 having such a structure, heat from the vacuum pump (not shown) transmitted to the pump mounting flange 103 and eddy current loss generated in the can 108 and transmitted to the pump mounting flange 103 are caused. The heat is cooled by the cold water flowing into the gap A between the outer periphery of the motor frame 102 and the jacket 105, and can be efficiently discharged to the outside by the cold water flowing into the gap B in the pump mounting flange 103. It is possible to suppress the temperature rise of the canned motor 101 as a whole.

On the other hand, in the invention described in Patent Document 2, a water flow regulating member is provided in the water cooling jacket so that the cooling water flows spirally.
However, the above-described conventional technique requires components that constitute the cooling water flow path and needs to have a structure that requires airtightness, which causes an increase in cost.

Moreover, in such a prior art, although the stator core is cooled comparatively easily, it is difficult to cool the coil end.
In addition, there is a problem that it cannot be operated in an environment where cooling water cannot be used.

JP-A-5-223097 Japanese Patent Laid-Open No. 10-318197

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide a canned motor capable of sufficiently cooling a stator core and a coil end with a simple configuration. Is to provide at a low cost.

The present invention, which has been made to achieve the above object, includes a casing, an airtight can that is provided in the casing and accommodates a rotor attached to a shaft, and is fixed by the can in the casing. A stator disposed in the child space, and the casing is provided with an introduction vent for introducing air outside the casing into the stator space, communicating with the stator space, It is a canned motor provided with the ventilation means which ventilates with respect to the ventilation hole of the said casing.
The present invention is also effective when the casing is provided with a vent hole for communicating with the stator space and exhausting the air in the stator space to the outside of the casing.
Further, the present invention provides a casing, an airtight structure can which is provided in the casing and accommodates a rotor attached to a shaft, and a fixed member disposed in a stator space isolated by the can in the casing. A discharge vent for communicating with the stator space and discharging the air in the stator space to the outside of the casing. It is a canned motor provided with suction means for sucking air in the vicinity.
The present invention is also effective when the casing is provided with an introduction vent that communicates with the stator space and introduces air outside the casing into the stator space.
The present invention is also effective in the case where the introduction vent and the discharge vent are provided at positions opposite to each other across the can in the casing.
Further, the present invention is a vacuum pump that includes any of the above-described canned motors and is configured to be driven by the canned motor.

In the case of the present invention, the casing is provided with an introduction vent that communicates with the stator space and introduces air outside the casing into the stator space, and blows air to the vent of the casing. Because the cooling air introduced into the stator space can directly cool the stator core, coil end, and can, the cooling efficiency of the stator, coil end, and can jumps dramatically. Improve.
In particular, since the coil end can be directly air-cooled, the heat removal effect is high. Further, by directly cooling the inner part of the casing or the like, heat transfer from the bearing that supports the motor drive shaft can be more efficiently removed.
In addition, according to the present invention, there is no need for parts constituting the cooling water flow path, the cost can be reduced, and the system can be operated even in an environment where the cooling water cannot be used.
In the present invention, when the casing is provided with a vent hole for communicating with the stator space and discharging the air in the stator space to the outside of the casing, the casing is continuously provided in the casing. Since the cooling air is introduced and continuously discharged from the discharge vent, the cooling is always performed by new cooling air, and each part can be efficiently cooled.
In the present invention, the casing is provided with a discharge vent that communicates with the stator space and discharges the air in the stator space to the outside of the casing. Since the suction means for sucking the air in the stator space is provided, the heated air in the casing is discharged to the outside of the casing through the discharge vent, so that the inside of the casing is cooled. be able to.
In this case, if the casing is provided with an introduction vent that communicates with the stator space and introduces air outside the casing into the stator space, the cooling air is supplied from the introduction vent of the casing. Is continuously introduced into the stator space, and the cooling core can directly and continuously cool the stator core, coil ends, and cans. Can be improved.
In the case of the present invention, in the casing, when the introduction vent and the discharge vent are provided at positions opposite to each other with the can interposed therebetween, the cooling air from the air blowing means or the cooling air from the suction means is generated. Since it flows smoothly in the casing, cooling can be performed more efficiently.
Thus, according to the present invention, a vacuum pump including a canned motor that can sufficiently cool the stator core and the coil end with a simple configuration can be provided at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, the canned motor which can fully cool the core and coil end of a stator with simple structure can be provided at low cost.

(A): Sectional view showing the internal configuration of the embodiment of the canned motor according to the present invention (b): Partial sectional view showing the operation of the canned motor (A): Cross-sectional view showing the internal configuration of another embodiment of the canned motor according to the present invention (b): Partial cross-sectional view showing the operation of the canned motor Sectional drawing which shows the internal structure of the conventional canned motor

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1A is a cross-sectional view showing the internal configuration of the embodiment of the canned motor according to the present invention, and FIG. 1B is a partial cross-sectional view showing the operation of the canned motor.

As shown in FIG. 1A, the canned motor 1 according to the present embodiment is attached to a wall surface 50 of a vacuum pump, for example, and has a cylindrical casing 2, for example.
A cover 3 is attached to one open end of the casing 2 so as to close the open end.
A stator 4 is attached and fixed to, for example, an inner wall in the casing 2.

On the other hand, a cylindrical can 5 is provided in the central portion of the casing 2.
The can 5 divides the inside of the casing 2 into a rotor space 10A and a stator space 4A.

In the can 5, a shaft 9 rotatably supported by a bearing 7 attached to the flange portion 2 a of the inner wall of the casing 2 on the vacuum pump side and a bearing 8 attached to the flange portion 3 a of the inner wall of the cover 3. Is provided.
The shaft 9 is connected to a rotating shaft (not shown) of a vacuum pump, and a rotor 10 is attached to a portion in the vicinity of the stator 4 around the shaft 9.

  Furthermore, a vent described below is provided in the side wall of the casing 2. In the case of the present embodiment, the vent has a first vent 11 that is an introduction vent and a second vent 12 that is a discharge vent.

  In the case of the present invention, the position where the vent is provided is not particularly limited. However, from the viewpoint of further improving the heat dissipation effect, a position close to the heat generating portion, for example, as shown in FIG. It is preferable to provide the 1st ventilation hole 11 connected to 4 A of stator spaces near 4 coil end 4a.

In the case of the present embodiment, the first vent holes 11 are provided in the vicinity of the two coil ends 4 a of the stator 4.
In the case of the present invention, from the viewpoint of further improving the heat dissipation effect, the second side wall portion of the casing 2 opposite to the side wall portion of the casing 2 provided with the first vent 11 is sandwiched between the second side wall portion of the casing 2 and the second side wall portion. More preferably, a vent 12 is provided.
In addition, the number of the 1st and 2nd vent holes 11 and 12 may be one or more.

Further, in the present embodiment, a fan (air blowing means) 13 is provided in the vicinity of the first vent 11 provided in the casing 2.
In this case, the positions of the fan 13 and the first vent hole 11 are set so that the first vent hole 11 faces the blowing portion of the fan 13, respectively.

In the present embodiment having such a configuration, when the canned motor 1 is operated, heat is generated by the following heat source, and the heat is transmitted through the following path.
・ Heat generation at the core of the stator 4 → casing 2
-Heat generation at coil end 4a-> core portion of stator 4-> casing 2
-Heat generation of can 5-> cover 3 and casing 2
・ Heat generation of bearing 7 → casing 2
・ Heat generation of bearing 8 → cover 3
-Heat generation of the rotor-> shaft 9-> bearings 7, 8-> cover 3 and casing 2
・ Load side heat generation → Shaft 9 → Bearings 7 and 8 → Cover 3 and casing 2

  In the present embodiment, the outer portion of the casing 2 and the cover 3 can be cooled by operating the fan 13 and blowing air. As a result, the heat generated by the canned motor 1 itself and a part of the heat transmitted from the load side are cooled.

  In addition, in the present embodiment, as shown in FIG. 1B, the cooling air 20 is introduced into the stator space 4A from the first vent 11 of the casing 2. Since the cooling air 20 can directly cool the core portion of the stator 4, the coil end 4 a, and the can 5, the cooling efficiency of the stator 4, the coil end 4 a, and the can 5 can be dramatically improved.

In particular, since the coil end 4a can be directly air-cooled, the heat removal effect is high. Further, by directly cooling the inner part of the casing 2 and the cover 3, heat transfer from the bearings 7 and 8 can be removed more efficiently.
Along with this, the heat generation of the rotor 10 and the heat generation on the load side that are removed through the bearings 7 and 8 can be more efficiently removed.

Further, in the present embodiment, the cooling air 20 is continuously introduced into the casing 2 and continuously discharged from the second vent 12, so that cooling is always performed by the new cooling air 20. Therefore, each part can be cooled more efficiently.
Moreover, according to this Embodiment, the components which comprise a cooling water flow path are unnecessary, and while being able to aim at cost reduction, it can drive | operate also in the environment where cooling water cannot be used.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above embodiment, the cooling air 20 is introduced from the first vent 11 and the cooling air 20 is discharged from the second vent 12. However, the present invention is not limited to this, and the second It is also possible to introduce the cooling air 20 from the air vent 12 and discharge the cooling air 20 from the first air vent 11.

Further, the arrangement position of the fan 13 is not limited to the above embodiment, and the fan 13 can be arranged on the counterload side of the motor, that is, on the cover 3 side.
In this case, it is preferable to provide an introduction side vent in the cover 3.
Furthermore, in addition to the 1st and 2nd ventilation holes 11 and 12, a new ventilation hole can also be added.

2 (a) and 2 (b) show another embodiment of the present invention. Hereinafter, the same reference numerals are given to the portions corresponding to the above-described embodiment, and the detailed description thereof will be omitted.
The canned motor 1 </ b> A of the present embodiment includes, for example, a fan 13 </ b> A whose air blowing direction is opposite to that of the fan 13 described above as suction means.
And the 2nd ventilation hole 12 which is a ventilation | gas_flowing ventilation hole is provided in the vicinity of the two coil ends 4a of the stator 4, respectively.

Furthermore, from the viewpoint of further improving the heat dissipation effect, the first vent hole 11 is formed on the side wall portion of the casing 2 on the opposite side of the can 5 with respect to the side wall portion of the casing 2 provided with the second vent hole 12. Is provided.
In addition, the number of the 1st and 2nd vent holes 11 and 12 may be one or more.

  In the present embodiment having such a configuration, by operating the fan 13A and sucking air, the heated air in the casing 2 is discharged to the outside of the casing 2 through the second vent 12. Therefore, the inside of the casing 2 can be cooled.

  Furthermore, in the present embodiment, as shown in FIG. 2B, the cooling air 20 is continuously introduced into the stator space 4 </ b> A from the first vent 11 of the casing 2, and is fixed by the cooling air 20. Since the core portion, the coil end 4a, and the can 5 of the child 4 can be directly and continuously cooled, the cooling efficiency of the stator 4, the coil end 4a, and the can 5 can be dramatically improved.

Since other configurations and operational effects are the same as those of the above-described embodiment, detailed description thereof is omitted.
The present invention can be applied to both the built-in type and the stand-alone type.

DESCRIPTION OF SYMBOLS 1 ... Canned motor 2 ... Casing 3 ... Cover 4 ... Stator 4a ... Coil end 4A ... Stator space 5 ... Can 9 ... Shaft 10 ... Rotor 10A ... Rotor space 11 ... 1st vent (Introduction vent) )
12 ... Second vent (exhaust vent)
13 ... Fan (air blowing means)

Claims (6)

A casing,
An airtight can that houses a rotor mounted in the casing and attached to the shaft;
A stator disposed in a stator space isolated by the can in the casing,
The casing is provided with an introduction vent that communicates with the stator space and introduces air outside the casing into the stator space, and blows air to the introduction vent of the casing. A canned motor provided with means.   2. The canned motor according to claim 1, wherein the casing is provided with a discharge vent that communicates with the stator space and discharges air in the stator space to the outside of the casing. A casing,
An airtight can that houses a rotor mounted in the casing and attached to the shaft;
A stator disposed in a stator space isolated by the can in the casing,
The casing is provided with a discharge vent that communicates with the stator space and discharges the air in the stator space to the outside of the casing, and the stator space via the discharge vent. A canned motor provided with suction means for sucking air inside.   The canned motor according to claim 3, wherein the casing is provided with an introduction vent that communicates with the stator space and introduces air outside the casing into the stator space.   5. The canned motor according to claim 2, wherein in the casing, the introduction vent and the discharge vent are provided at positions opposite to each other with the can interposed therebetween. It has the canned motor of any one of Claims 1 thru / or 5,
A vacuum pump configured to be driven by the canned motor.

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