JP2014126037A - Compression unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compression unit that can be easily maintained.SOLUTION: A compression unit 1 comprises: an electric motor 2 including a stator 21 and a rotor 22 rotated about an axis line by an interaction with the stator 21; a compressor 3 including a shaft 31 integrally connected to the rotor 22 and rotated about the axis line together with the rotor 22 and an impeller 32 provided to the shaft 31; an inner casing 4 that houses the electric motor 2 and the compressor 3 inside and can be divided into a plurality of parts in the circumferential direction of the axis line; and an outer casing 5 that houses the inner casing 4 inside so that it can be moved relatively in the axis line direction.

Description

  The present invention relates to a compression unit.

  As a compression unit in which a motor and a compressor are integrated, a centrifugal compressor and an electric motor for driving a rotor of the centrifugal compressor are provided. The centrifugal compressor and the electric motor are accommodated in a common airtight housing. Have been proposed (see Patent Document 1 below). The housing is divided and fixed to each other so as to be integrated.

  In such a compression unit, since the centrifugal compressor and the electric motor are integrally arranged in the housing, there is a merit that they can operate stably without being affected by external influences. Furthermore, the centrifugal compressor and the electric motor can be easily transported as a unit.

JP-T-2004-527893

  However, in the compression unit described in the above-mentioned Patent Document 1, it is necessary to divide the housing and take out the device at the time of maintenance of the device arranged in the housing such as the centrifugal compressor and the electric motor. Further, when the maintenance is completed, it is necessary to fix the divided housings to each other as in the original state. Therefore, there is a problem that disassembly and assembly of the housing are required, and maintenance is poor.

  The present invention has been made in view of such circumstances, and provides a compression unit that can be easily maintained.

In order to achieve the above object, the present invention employs the following means.
That is, the compression unit according to the present invention includes a stator and an electric motor having a rotor that rotates about an axis by magnetic interaction with the stator, and the rotor integrally connected to the rotor, and rotates about the axis together with the rotor. A compressor having a shaft and an impeller provided on the shaft; an inner casing in which the electric motor and the compressor are housed and divided into a plurality of circumferential directions of the axis; and the inner casing in the axial direction And an outer casing that is housed inside thereof so as to be relatively movable.

  In such a compression unit, when the inner casing moves relative to the outer casing in the axial direction, the inner casing is taken out from one side in the axial direction of the outer casing. When the inner casing is divided into a plurality of parts in the circumferential direction, the electric motor and the compressor integrated with each other are taken out via the rotor of the electric motor. Therefore, the inner casing can be removed from the outer casing and the inner casing as a single unit by moving the inner casing in the axial direction and dividing in the circumferential direction without dividing the outer casing, so that the maintenance of the motor and the compressor is easy. Can be done.

  Moreover, it is preferable that the compression unit which concerns on this invention is provided with the transport mechanism which enables the said inner casing to move relatively to the said axial direction with respect to the said outer casing.

  In such a compression unit, at the time of maintenance, since the inner casing can be easily taken out from the outer casing and the inner casing can be easily accommodated inside the outer casing by the transport mechanism, the maintainability can be improved.

  In the compression unit according to the present invention, the transport mechanism is provided on one of the outer peripheral side of the inner casing and the inner peripheral side of the outer casing, and the outer peripheral side of the inner casing and the inner peripheral side of the outer casing. A roller that contacts the other side and moves in the axial direction may be provided, and three or more of the rollers may be provided on the one side.

  In such a compression unit, since three or more transport mechanisms are provided in the circumferential direction on the outer circumferential side of the inner casing or the inner circumferential side of the outer casing, the inner casing is stable in the circumferential direction with respect to the outer casing. Can be moved in the axial direction. Therefore, the inner casing can be taken out and stored reliably and stably.

  In the compression unit according to the present invention, the inner casing may be divided into two in the vertical direction.

  In such a compression unit, since it is divided into two in the vertical direction, the inner casing (hereinafter referred to as the upper casing) disposed on the upper side has its own weight, and the inner casing (hereinafter referred to as the lower casing) disposed on the lower side. (Referred to as side casing). Therefore, since the upper casing can be stably provided on the upper side of the lower casing without using a fixing means or the like, a simple configuration can be achieved.

  The compression unit according to the present invention may include a cooling unit that cools the electric motor.

  In such a compression unit, since the cooling unit can cool the electric motor, the electric motor can be continuously operated normally.

  Further, in the compression unit according to the present invention, as the cooling portion, a circumferential flow path is formed between the inner circumferential side of the outer casing and the outer circumferential side of the inner casing, and the outer casing is disposed on the outer circumferential side of the circumferential flow path. An outer channel that is arranged and communicates with the circumferential channel may be formed.

  In such a compression unit, the fluid flowing through the outer flow path is affected by the external atmosphere. Therefore, when the temperature of the external atmosphere is low, the temperature of the fluid flowing through the outer flow path is low. Further, as the temperature of the fluid flowing through the outer flow path decreases, the temperature of the fluid flowing through the peripheral flow path communicating with the outer flow path also decreases. Thereby, the inner casing disposed on the inner circumferential side of the circumferential flow path, and further the electric motor disposed on the inner side of the inner casing can be reliably cooled.

  Further, in the compression unit according to the present invention, the outer unit has a casing body that opens toward one side in the axial direction, and a casing lid that can be opened and closed at the opening of the casing body. The lid may be detachably attached to one side in the axial direction of the inner casing.

  In such a compression unit, when the casing lid is removed from the casing body and moved to one side in the axial direction, the inner casing attached to the casing lid moves to one side in the axial direction together with the casing lid. Here, since the electric motor and the compressor are accommodated inside the inner casing, the electric motor and the compressor move to one side in the axial direction together with the casing lid and the inner casing. Therefore, the electric motor and the compressor can be easily taken out together with the casing lid.

  According to the compression unit of the present invention, the motor and the compressor can be taken out from the outer casing and the inner casing as a single unit by movement in the axial direction and division in the circumferential direction. Therefore, maintenance can be easily performed.

It is a schematic diagram explaining the structure of the compression unit which concerns on 1st embodiment of this invention. It is AA sectional drawing of FIG. It is a schematic diagram explaining the structure of the compression unit which concerns on 2nd embodiment of this invention.

(First embodiment)
Hereinafter, a compression unit according to a first embodiment of the present invention will be described with reference to the drawings.
Note that the compression unit according to the present embodiment is mounted on, for example, a ship that generates gas and oil on the ocean, or is installed on the ocean floor.

  The compression unit 1 includes an electric motor 2 having a rotor 22 that rotates about an axis, a compressor 3 that is integrally connected to the rotor 22 and that has a shaft 31 provided on the inner peripheral side of the rotor 22, the electric motor 2, and the compression An inner casing 4 that houses the machine 3, an outer casing 5 that houses the inner casing 4, and a transport mechanism 6 that can move the inner casing 4 in the axial direction relative to the outer casing 5. .

By this transport mechanism 6, the inner casing 4 can be taken out from one side in the axial direction with respect to the outer casing 5.
In this embodiment, the axial direction is the XY direction, one axial direction is the X side shown in FIG. 1, and the other axial direction is the Y side shown in FIG.

  The electric motor 2 includes a stator 21 and a rotor 22 provided integrally with a shaft 31 extending in the XY direction of the compressor 3.

  The stator 21 is disposed in the circumferential direction of the rotor 22. For example, a plurality of stator cores (not shown) arranged along the circumferential direction of the rotor 22, and stator windings (not shown) wound around the stator core. (Shown).

  The rotor 22 is provided in the circumferential direction of the shaft 31 extending in the X-Y direction. For example, a plurality of rotor cores (non-rotating cores) are provided apart from each other in the circumferential direction of the shaft 31 and extend in the X-Y direction. (Shown).

  In the electric motor 2, when a current supplied from the outside flows through the stator 21, a rotating magnetic field is generated around the stator 21. As a result, an induced current is generated in the rotor 22 by the magnetic interaction between the stator 21 and the rotor 22, and the rotor 22 rotates about the axis together with the shaft 31 of the compressor 3.

  The compressor 3 includes a shaft 31 extending in the XY direction and an impeller 32 provided on the outer peripheral surface of the shaft 31.

  The shaft 31 extends from the X side of the compressor 3 to the Y side of the electric motor 2. Further, as described above, the rotor 22 of the electric motor 2 is provided in the circumferential direction of the shaft 31. Thereby, the compressor 3 is integrally connected to the rotor 22 of the electric motor 2 via the shaft 31.

  The impeller 32 rotates with the shaft 31 to compress and pressurize the fluid passing through the impeller 32 by centrifugal force.

A pair of radial magnetic bearings 36A and 36B are provided in the circumferential direction at both ends of the shaft 31 in the XY direction. Further, a radial magnetic bearing 36 </ b> C is provided in the circumferential direction between a portion of the shaft 31 where the electric motor 2 is provided and a portion where the compressor 3 is provided. The radial magnetic bearings 36 </ b> A, 36 </ b> B, 36 </ b> C support a load that acts on the shaft 31 in the radial direction.
In the present embodiment, three radial magnetic bearings 36A, 36B, and 36C are provided in the axial direction.

  Further, a thrust bearing 37 is provided in the circumferential direction between the portion of the shaft 31 where the compressor 3 is provided and the portion where the radial magnetic bearing 36C is provided. The thrust bearing 37 supports a load acting on the shaft 31 in the XY direction.

  Further, a seal mechanism (not shown) for preventing the fluid on the compressor 3 side from moving to the electric motor 2 side is provided on the outer periphery of the shaft 31 in the vicinity of the thrust bearing 37.

  As shown in FIGS. 1 and 2, the inner casing 4 is formed in a bottomed cylindrical shape. The inner casing 4 is divided into two in the circumferential direction, which is divided in the vertical direction in the present embodiment, and has an upper casing 41 and a lower casing 46 disposed below the upper casing 41.

  In the upper casing 41, convex portions 41 </ b> A and 41 </ b> B projecting upward are formed apart from each other in the XY direction at a portion where the compressor 3 is disposed on the inner peripheral side thereof.

  A suction port 44 that is a through hole penetrating in the vertical direction is formed in the convex portion 41A. Further, a discharge port 45 that is a through hole penetrating in the vertical direction is formed in the convex portion 41B.

  The outer casing 5 has a casing body 51 that opens to the X side, and a casing lid 56 that is provided at the opening of the casing body 51 so as to be openable and closable.

  The casing main body 51 has a cylindrical portion 52 formed in a cylindrical shape, and a bottom portion 53 provided at an end portion on the Y side of the cylindrical portion 52.

  The cylindrical portion 52 is formed with a suction port 54 penetrating in the vertical direction at a portion corresponding to the suction port 44 formed in the convex portion 41 </ b> A of the inner casing 4. Further, a discharge port 55 penetrating in the vertical direction is formed in the cylindrical portion 52 at a portion corresponding to the discharge port 45 formed in the convex portion 41 </ b> B of the inner casing 4.

The suction port 54 of the outer casing 5 and the suction port 44 of the inner casing 4 are connected via a convex portion 41 </ b> A of the inner casing 41. For example, the upper end of the convex portion 41 </ b> A may be configured to contact the inner peripheral surface of the outer casing 5, or the packing may be interposed between the upper end of the convex portion 41 </ b> A and the inner peripheral surface of the outer casing 5. Good.
The outlet 55 of the outer casing 5 and the outlet 44 of the inner casing 4 are also connected via the convex portion 41B of the inner casing 41 in the same manner as described above.

  An annular seal member 59 is provided between the end portion on the X side of the cylindrical portion 52 and the casing lid 56. The casing lid 56 is fixed to the cylindrical portion 52 via a seal member 59.

  The casing lid 56 is detachably attached to the upper casing 41 and the lower casing 46 of the inner casing 4. In the present embodiment, the casing lid 56 is attached to the upper casing 41 and the lower casing 46 by, for example, screwing of bolts and nuts (not shown).

  Further, a circumferential space portion S <b> 1 continuous in the circumferential direction is formed between the cylindrical portion 52 of the outer casing 5 and the upper casing 41 and the lower casing 46 of the inner casing 4. Further, an end space portion S2 communicating with the circumferential space portion S1 is formed between the bottom portion 53 of the outer casing 5 and the upper casing 41 and the lower casing 46 of the inner casing 4.

  The transport mechanism 6 is provided on the outer peripheral side of the upper casing 41 and the lower casing 46 of the inner casing 4 and is disposed in the peripheral space S1. The transport mechanism 6 includes a plurality of roller portions (rollers) 61 provided along the outer peripheral side of the upper casing 41 and the lower casing 46 of the inner casing 4 and the center of each roller portion 61. And a shaft portion 62 extending in the circumferential direction.

  In the present embodiment, the transport mechanism 6 configured as described above is provided as a pair of upper rollers 66 spaced apart in the circumferential direction on the upper casing 41 of the inner casing 4, and further on the lower casing 46 of the inner casing 4. A pair of lower rollers 67 are provided apart from each other in the circumferential direction.

  The upper roller 66 and the lower roller 67 are provided on the same plane orthogonal to the XY direction, and are provided in the vicinity of both ends of the inner casing 4 in the XY direction.

  Further, the upper roller 66 and the lower roller 67 rotate around the respective shaft portions 62, rotate on the inner peripheral surface of the outer casing 5, and move in the XY direction. Thereby, the inner casing 4 is movable relative to the outer casing 5 in the XY direction.

  Next, the operation of the compression unit 1 configured as described above will be described.

  When electric power is supplied to the electric motor 2 from the outside, a rotating magnetic field is generated in the stator 21. As a result, an induced current is generated in the rotor 22 by the magnetic interaction between the stator 21 and the rotor 22, and the rotor 22 rotates about the axis together with the shaft 31 of the compressor 3.

  Here, in the compressor 3, the impeller 32 provided on the shaft 31 rotates as the shaft 31 rotates.

  On the other hand, the fluid introduced into the compression unit 1 from the suction port 54 of the outer casing 5 is introduced to the compressor 3 disposed inside the inner casing 4 through the suction port 44 of the inner casing 4. The fluid introduced into the compressor 3 passes through the impeller 32 and is compressed and pressurized by centrifugal force.

  Then, the compressed and pressurized fluid passes through the discharge port 45 of the inner casing 4 and is discharged from the discharge port 55 of the outer casing 5 to the outside of the compression unit 1.

  Next, a maintenance procedure in the compression unit 1 configured as described above will be described.

  First, the casing lid 56 of the outer casing 5 is removed from the casing body 51, and the casing lid 56 is moved toward the X side.

  Here, in the inner casing 4 integrated with the casing lid 56, the upper roller 66 and the lower roller 67 provided on the outer peripheral side of the outer casing 5 move along the inner casing 4 with the movement of the casing lid 56 of the outer casing 5. The peripheral surface is rotated and moved in the XY direction. Thereby, the inner casing 4 is pulled out from the casing body 51 of the outer casing 5 in the X direction.

  Next, the bolts and nuts of the upper casing 41 and the lower casing 46 of the inner casing 4 are unscrewed from the casing lid 56 of the outer casing 5, and the casing lid 56 is removed from the upper casing 41 and the lower casing 46.

  Next, when the upper casing 41 of the inner casing 4 is removed from the lower casing 46, the upper portions of the electric motor 2, the compressor 3, the radial magnetic bearings 36A, 36B, 36C, and the thrust bearing 37 are exposed from the lower casing 46. . Then, the electric motor 2, the compressor 3, the radial magnetic bearings 36A, 36B, and 36C and the thrust bearing 37 are taken out from the lower casing 46, and maintenance of these devices is performed.

  After the maintenance, the electric motor 2, the compressor 3, the radial magnetic bearings 36A, 36B, and 36C and the thrust bearing 37 are accommodated in the lower casing 46. Then, the upper casing 41 is disposed on the lower casing 46, and both the upper casing 41 and the lower casing 46 are attached to the casing lid 56 of the outer casing 5 by screwing bolts and nuts.

  Next, the electric motor 2, the compressor 3, the radial magnetic bearings 36A, 36B, and 36C, the thrust bearing 37, the inner casing 4 and the casing lid 56 of the outer casing 5 integrated as described above are connected to the casing body of the outer casing 5. 51 is moved in the Y direction. The compression unit 1 is assembled by moving the inner casing 4 to a predetermined position and attaching the casing lid 56 of the outer casing 5 to the casing body 51.

  In the compression unit 1 configured as described above, when the casing lid 56 of the outer casing 5 is moved toward the X side, the inner casing 4 fixed to the casing lid 56 is also moved toward the X side. That is, the inner casing 4 is taken out from the X side of the casing body 51 of the outer casing 5. Next, when the upper casing 41 of the inner casing 4 is removed from the lower casing 46, the compressor 3, the electric motor 2 provided integrally with the shaft 31 of the compressor 3, and the radial magnetic bearings 36 </ b> A and 36 </ b> B provided on the shaft 31. , 36C and the thrust bearing 37 are taken out. Therefore, the compressor 3, the electric motor 2, the radial magnetic bearings 36A, 36B, and 36C and the thrust bearing 37 are integrated by moving the inner casing 4 in the XY direction and dividing in the circumferential direction without dividing the outer casing 5. Take out and maintain easily.

  During maintenance, the upper roller 66 and the lower roller 67 provided on the inner casing 4 rotate on the inner peripheral surface of the outer casing 5 and move toward the X side, so that the inner casing 4 can be easily moved from the outer casing 5. Can be taken out. Further, after the maintenance is completed, the upper roller 66 and the lower roller 67 rotate on the inner peripheral surface of the outer casing 5 and move toward the Y side, so that the inner casing 4 can be easily accommodated in the outer casing 5. can do. Therefore, the inner casing 4 can be easily taken out and accommodated, so that maintainability can be improved.

Conventionally, two bearings for supporting the shaft 31 may be provided at both ends of the shaft 31 extending in the axial direction. In this case, although maintainability can be improved, it is more susceptible to shaft vibration than in the case where three bearings are provided, and the operating range such as the rotational speed of the compressor 3 is limited. Further, in the case of a configuration in which the shaft is coupled between the electric motor 2 and the compressor 3, the drawing work from both sides is difficult.
On the other hand, according to the present embodiment, although three bearings (radial magnetic bearings 36A, 36B, 36) are provided, the maintainability can be improved and the shaft vibration is stronger than the case where two bearings are provided. There is no need to limit the operating range.

  Furthermore, since the upper roller 66 and the lower roller 67 are provided in a total of four on the same plane perpendicular to the XY direction, the inner casing 4 maintains a stable state in the circumferential direction with respect to the outer casing 5. And move in the XY direction. Therefore, the compressor 3, the electric motor 2, the radial magnetic bearings 36 </ b> A, 36 </ b> B, 36 </ b> C and the thrust bearing 37 accommodated in the inner casing 4 and the inner casing 4 can be reliably and stably taken out.

  Further, since the inner casing 4 is divided into two in the vertical direction, the upper casing 41 is disposed on the upper side of the lower casing 46 by its own weight. Therefore, since the upper casing 41 can be stably provided on the upper side of the lower casing 46 without using a fixing means or the like, a simple configuration can be achieved.

  As described above, the inner casing 4 is taken out from the X side of the outer casing 5. The inner casing 4 is fixed to a casing lid 56 that is a member on the X side among members constituting the outer casing 5. Therefore, when the inner casing 4 is fixed to the casing lid 56, the work can be performed on the taken-out X side, so that workability can be improved. Therefore, since the center position of the shape in which the upper casing 41 and the lower casing 46 of the inner casing 4 are combined with the center position of the outer casing 5 can be accurately aligned, the assembly accuracy can be improved.

  Further, the suction port 54 of the outer casing 5 and the suction port 44 of the inner casing 4 are connected via a convex portion 41A. Similarly, the discharge port 55 of the outer casing 5 and the discharge port 45 of the inner casing 4 are connected via a convex portion 41B. Since the convex portions 41A and 41B are formed so as to protrude from the inner casing 4 toward the outer casing 5, the convex portions 41A and 41B move when the inner casing 4 moves in the XY direction. Therefore, the workability can be improved.

(Second embodiment)
Hereinafter, with reference to the drawings, a compression unit 201 according to the second embodiment of the present invention will be described with reference to FIG.
In this embodiment, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The compression unit 201 according to the present embodiment further includes a cooling unit 7 that supplies a gas for cooling the electric motor 2. As the cooling unit 7, a peripheral flow path 71 is formed between the inner peripheral side of the outer casing 5 and the outer peripheral side of the inner casing 4, and an outer flow path 72 is formed on the outer peripheral side of the peripheral flow path 71.

  A circumferential space portion S1 and an end space portion S2 formed between the inner casing 4 and the outer casing 5 serve as a circumferential flow path 71.

  The cylindrical portion 52 of the outer casing 5 is formed with a convex portion 57 that protrudes outward in the radial direction. The convex portion 57 is formed with a first space portion S11 that communicates with the circumferential space portion S1 formed between the inner casing 4 and the outer casing 5 and extends radially outward. The convex portion 57 is formed with a second space portion S12 that communicates with the first space portion S11 and extends in the XY direction. Further, the convex portion 57 is formed with a third space portion S13 that communicates with the second space portion S12 and extends radially inward.

  The first space portion S11, the second space portion S12, and the third space portion S13 serve as an outer flow path 72 disposed on the outer peripheral side of the peripheral flow path 71.

  In the compression unit 201 configured as described above, for example, when the compression unit 201 is installed in a place where the temperature of the external atmosphere is low, such as in the sea or in a cold region, the fluid flowing through the outer flow path 72 is influenced by the external atmosphere. In response, the temperature decreases. In addition, since the circumferential flow path 71 communicates with the outer flow path 72, the temperature of the fluid flowing through the circumferential flow path 71 decreases as the temperature of the fluid flowing through the outer flow path 72 decreases. Therefore, it is possible to reliably cool the inner casing 4 disposed on the inner peripheral side of the circumferential flow path 71 and further the electric motor 2 disposed on the inner side of the inner casing 4.

  The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above embodiment, the case where the transport mechanism 6 is provided on the outer peripheral side of the inner casing 4 has been described as an example. However, the present invention is not limited to this, and the transport mechanism 6 may be provided on the inner peripheral side of the outer casing 5. In this case, when the roller rotates on the outer peripheral surface of the inner casing 4, the inner casing 4 can move relative to the outer casing 5 in the XY direction.

  In the present embodiment, an example has been described in which a total of four upper rollers 66 and lower rollers 67 are provided on the same plane orthogonal to the XY direction. However, the present invention is not limited to this, and if there are a total of three upper rollers 66 and lower rollers 67 on the same plane orthogonal to the XY direction, the inner casing 4 is on the same plane orthogonal to the XY direction. Are stably supported by the outer casing 5. Furthermore, the present invention may include one or two rollers.

  Moreover, although the structure which has the roller part 61 and the axial part 62 as the transport mechanism 6 was demonstrated, this invention is not restricted to this, It faces to the XY direction at the outer peripheral side of the inner casing 4 or the outer peripheral side of the outer casing 5. A configuration may be provided in which a rail extending in the direction is provided. Or the structure provided in the outer peripheral side of the inner side casing 4 or the outer peripheral side of the outer side casing 5 in the tire which rotates toward a XY direction may be sufficient. Further, the outer peripheral member of the inner casing 4 and the inner peripheral member of the outer casing 5 may be formed of materials having a low friction coefficient so that the slidability in the XY direction is improved. Furthermore, the transport mechanism 6 may not be provided.

  Moreover, although the inner casing 4 was demonstrated taking the example of the structure divided | segmented into the upper casing 41 and the lower casing 46, this invention is not restricted to this, You may divide | segment into several in another direction. In this case, the divided inner casings may be fixed to each other by fixing means such as bolts and nuts and housed in the outer casing 5. Moreover, after taking out from the outer casing 5, if the screw | thread of a volt | bolt and a nut is removed, the inner casing 4 will be divided | segmented and the electric motor 2 and the compressor 3 can be taken out.

  Further, in the above-described embodiment, the case where the circumferential flow channel 71 and the outer flow channel 72 are formed in the compression unit 1 as the cooling unit 7 has been described as an example. However, the present invention is not limited to this, and the cooling unit 7 may have a heat exchanger or fins.

  In the above embodiment, the seal mechanism is taken as an example to prevent the fluid on the compressor 3 side from moving to the electric motor 2 side. However, the present invention is not limited to this, and a seal mechanism may be provided on the inner peripheral side of the inner casing 4, and a shielding plate may be provided between the compressor 3 and the electric motor 2.

DESCRIPTION OF SYMBOLS 1 ... Compression unit 2 ... Electric motor 3 ... Compressor 4 ... Inner casing 5 ... Outer casing 6 ... Transport mechanism 7 ... Cooling part 21 ... Stator 22 ... Rotor 31 ... Shaft 32 ... Impeller 51 ... Casing body 56 ... Casing lid 61 ... Roller Part (roller)
71 ... Circumferential channel 72 ... Outer channel

Claims (7)

An electric motor having a stator and a rotor that rotates about an axis by magnetic interaction with the stator;
A compressor integrally connected to the rotor and having a shaft rotating around the axis together with the rotor and an impeller provided on the shaft;
An inner casing which accommodates the electric motor and the compressor inside thereof and can be divided into a plurality of parts in the circumferential direction of the axis;
A compression unit comprising: an outer casing for accommodating the inner casing therein so as to be relatively movable in the axial direction. The compression unit according to claim 1,
A compression unit comprising a transport mechanism that allows the inner casing to move relative to the outer casing in the axial direction. The compression unit according to claim 2,
The transport mechanism is provided on one of the outer peripheral side of the inner casing and the inner peripheral side of the outer casing, and is in contact with the other of the outer peripheral side of the inner casing and the inner peripheral side of the outer casing toward the axial direction. Has a moving roller,
3. The compression unit according to claim 1, wherein three or more rollers are provided on the one side. The compression unit according to any one of claims 1 to 3,
The compression unit characterized in that the inner casing can be divided into two in the vertical direction. In the compression unit according to any one of claims 1 to 4,
A compression unit comprising a cooling unit for cooling the electric motor. The compression unit according to claim 5,
As the cooling unit,
A circumferential flow path is formed between the inner peripheral side of the outer casing and the outer peripheral side of the inner casing,
A compression unit, characterized in that an outer flow path is formed on the outer casing and communicated with the peripheral flow path. The compression unit according to any one of claims 1 to 6,
The outer casing has a casing main body that opens toward one side in the axial direction, and a casing lid that is provided at the opening of the casing main body so as to be opened and closed.
The compression unit, wherein the casing lid is detachably attached to one side in the axial direction of the inner casing.

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