JP2016169809A - Rotating machine and balance adjustment method of rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating machine that can adjust the rotation balance of a rotating body while restraining the nonuniformity of a magnetic field in a magnetic bearing.SOLUTION: A rotating machine comprises: a rotating shaft; a thrust magnetic bearing configured to receive a thrust load of the rotating shaft by applying a magnetic force to a thrust collar provided on the rotating shaft; and at least one balance weight attached to the thrust collar. The balance weight is made of a non-magnetic material.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a rotating machine and a balance adjusting method of the rotating machine.

In a rotating machine, a balance weight may be used to adjust the rotational balance of the rotating body.
For example, Patent Document 1 includes thrust disks that are attached in the vicinity of both ends of a main shaft, and are configured to receive a thrust load by applying a reverse electromagnetic force to these thrust disks. A magnetic bearing rotating electrical machine having a bearing is disclosed. In this magnetic bearing rotating electrical machine, in order to adjust the rotational balance of the main shaft, a set screw as a balance weight is attached to and detached from a female screw provided at a predetermined interval in the circumferential direction at the peripheral portion of the thrust disk. ing.

JP-A-9-261920

  In the thrust magnetic bearing, in order to support the rotating shaft, a magnetic attractive force is applied to a thrust collar (thrust disk) provided on the rotating shaft by a magnetic field formed by an electromagnet. However, when a balance weight is attached to the thrust collar, depending on the material constituting the balance weight, the magnetic field formed by the electromagnet becomes uneven due to the influence of the balance weight, and the support of the rotating shaft by the thrust magnetic bearing may be unstable. There is a possibility.

  In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a rotating machine capable of adjusting the rotational balance of a rotating body while suppressing non-uniform magnetic fields in a magnetic bearing.

(1) A rotating machine according to at least one embodiment of the present invention includes:
A rotation axis;
A thrust magnetic bearing configured to receive a thrust load of the rotating shaft by applying a magnetic force to a thrust collar provided on the rotating shaft;
And at least one balance weight attached to the thrust collar,
The balance weight is made of a nonmagnetic material.

  According to the configuration of (1) above, since the balance weight is made of a non-magnetic material, the magnetic field for generating a magnetic force acting on the thrust collar is almost dependent on whether the balance weight is attached to the thrust collar. It does not change. Therefore, the rotational balance of the rotating body can be adjusted while suppressing the non-uniformity of the magnetic field in the magnetic bearing.

(2) In some embodiments, in the configuration of the above (1), the at least one balance weight is accommodated in a recess formed in the thrust collar.
According to the configuration of the above (2), the concave portion is formed in the thrust collar and the balance weight is accommodated in the concave portion. Therefore, peripheral members (for example, an electromagnet or a casing for forming a magnetic field, etc.) when the thrust collar rotates. ).

(3) In some embodiments, in the configuration of the above (2), the recess is formed on the outer peripheral surface of the thrust collar.
Normally, when a magnetic force is applied to the thrust collar, a relatively strong magnetic field is formed on the inner peripheral side of the thrust collar, and a relatively weak magnetic field is formed on the outer peripheral side of the thrust collar. According to the configuration of (3) above, since the concave portion to which the balance weight is attached is formed on the outer peripheral surface of the thrust collar, the influence of the concave portion on the magnetic field formed in the magnetic bearing can be reduced.
Further, since electromagnets for forming a magnetic field are usually arranged on both sides of the thrust collar in the axial direction, it may be difficult to access the thrust collar from the axial direction. In this respect, according to the configuration of (3) above, since the concave portion for attaching the balance weight is formed on the outer peripheral surface of the thrust collar, access to the concave portion is relatively easy. For this reason, for example, it becomes easy to attach and remove the balance weight to the recess.
In the configuration (3), the recess for attaching the balance weight is formed on the outer peripheral surface of the thrust collar, so the balance weight is attached to the outermost peripheral side of the thrust collar. In this case, since the centrifugal force acting on the rotating body is larger than when the balance weight is arranged on the inner peripheral side, balance adjustment can be performed effectively.

(4) In some embodiments, in the configuration of (3) above,
On the outer peripheral surface of the thrust collar, a plurality of balance holes as the recesses are formed at different positions in the circumferential direction of the thrust collar,
Each balance weight is accommodated in one of the balance holes.
According to the configuration of (4) above, since a plurality of balance holes are formed at different circumferential positions, it is possible to appropriately select the mounting position of the balance weight from the plurality of balance holes among the plurality of balance holes. In addition, a plurality of balance weights can be attached to the thrust collar. Therefore, the rotation balance can be adjusted appropriately by appropriately selecting the number or position of the balance weights to be attached.

(5) In some embodiments, in the configuration of (4) above,
The balance hole is a screw hole in which a female screw is formed,
The balance weight is formed with a male screw that is screwed into the female screw.
According to the configuration of the above (5), since the balance hole and the balance weight are formed by the female screw and the male screw, the balance weight can be prevented from jumping out in the circumferential direction when the rotary shaft rotates by tightening the screw. .
Further, according to the configuration of (5) above, the balance hole and the balance weight are formed by the female screw and the male screw, so that the rotational balance of the rotating body can be accurately adjusted by the depth to which the screw is attached.

(6) In some embodiments, in the configuration of (2) or (3) above,
On the outer peripheral surface of the thrust collar, slots as the concave portions are continuously formed in the circumferential direction,
The at least one balance weight is accommodated in the slot.
According to the configuration of (6) above, since the circumferentially continuous slot is formed as the concave portion, it is due to the presence of the concave portion as compared with the case where a plurality of holes (balance holes) are provided as the concave portion at intervals in the circumferential direction. The influence on the magnetic field can be reduced. For example, in the case where a plurality of balance holes are provided as recesses at intervals in the circumferential direction, if the balance (mass volume) of each balance weight is increased from the viewpoint of improving the rotational balance adjustment capability of each balance weight, The volume of the hole increases, and the balance hole may affect the distribution of the magnetic field in the circumferential direction. On the other hand, in the configuration of (6) above, even if the mass (volume) of each balance weight is increased, the slots as the recesses are continuous in the circumferential direction. The impact on the distribution is small.
In the configuration (6), the balance weight can be arranged at an arbitrary position in the circumferential direction in the slot formed continuously in the circumferential direction, so that the rotation balance can be adjusted flexibly.

  (7) In some embodiments, in the configuration of (2), the recess is formed on an axial end surface of the thrust collar.

(8) In some embodiments, in any one of the configurations (1) to (7),
The rotating machine is a motor-integrated compressor in which a compressor and a motor for driving the compressor are accommodated in the same casing.
In a compressor in which the motor and the compressor are housed in separate casings, the motor rotation shaft and the compressor rotation shaft may be connected via a coupling. In this case, the rotation balance is adjusted. The balance weight for this purpose can be provided on the flange portion of the coupling. However, in a motor-integrated compressor accommodated in the same casing, the rotating shafts may be coupled without using a coupling.
In the configuration (8), even in a motor-integrated compressor in which a flange portion is not provided in the connecting portion of the rotating shaft, the rotation balance can be adjusted by using the thrust collar effectively.

(9) In some embodiments, in the configuration of (8) above,
The thrust magnetic bearing is provided between the compressor and the motor.
According to the configuration of (9) above, since the thrust magnetic bearing is provided between the compressor and the motor, it is possible to adjust the rotational balance in the thrust collar disposed between the compressor and the motor. For this reason, compared with the case where the balance weight is arranged near one end of the rotating shaft, the weight balance along the axial direction of the rotating body is improved, and the rotating balance of the rotating body can be easily adjusted.

(10) A rotating machine balance adjustment method according to at least one embodiment of the present invention includes:
A rotation axis;
A thrust magnetic bearing configured to receive a thrust load of the rotating shaft by applying a magnetic force to a thrust collar provided on the rotating shaft,
Attaching at least one balance weight made of a non-magnetic material to the thrust collar;

  According to the method of (10) above, since the balance weight is made of a non-magnetic material, the magnetic field that generates the magnetic force acting on the thrust collar is almost dependent on whether the balance weight is attached to the thrust collar. It does not change. Therefore, the rotational balance of the rotating body can be adjusted while suppressing the non-uniformity of the magnetic field in the magnetic bearing.

  According to at least one embodiment of the present invention, a rotating machine capable of adjusting the rotational balance of a rotating body while suppressing non-uniform magnetic field in a magnetic bearing is provided.

It is a mimetic diagram showing the whole structure of a rotary machine (motor integrated compressor) concerning one embodiment. It is a figure which shows the structure of the thrust collar which concerns on one Embodiment. It is sectional drawing in the balance weight mounting part of the thrust collar shown in FIG. It is a figure which shows the structure of the thrust collar which concerns on one Embodiment. It is sectional drawing in the balance weight mounting part of the thrust collar shown in FIG. It is a figure which shows the structure of the thrust collar which concerns on one Embodiment. It is sectional drawing in the balance weight mounting part of the thrust collar shown in FIG.

  Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.

  In the following embodiments, a motor-integrated compressor will be described as an example of a rotating machine. However, the present invention can be applied not only to a motor-integrated compressor, but also to a rotary machine including a compressor and a motor in a separate casing from the motor.

  First, a rotating machine according to an embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating the overall structure of a motor-integrated compressor 1 that is a rotating machine according to an embodiment. As shown in the figure, the motor-integrated compressor 1 includes a compressor 2 and a motor 4 for driving the compressor 2, and the compressor 2 and the motor 4 are accommodated in the same casing 6. ing. The casing 6 includes a motor casing portion 6A that surrounds the motor 4 on the outer periphery of the motor 4, a compressor casing portion 6B that surrounds the compressor 2 on the outer periphery of the compressor 2, and portions 6C and 6D at both ends in the axial direction. Composed. The motor-integrated compressor 1 includes a rotating shaft 3 and a thrust magnetic bearing 8.

  The rotation shaft 3 of the motor-integrated compressor 1 includes a motor rotation shaft 30 and a compressor rotation shaft 32 connected to the output shaft. The rotational force generated by the motor 4 is transmitted to the compressor 2 via the rotary shaft 3.

  In one embodiment, the motor 4 is an induction motor having a rotor conductor 34 attached to the motor rotating shaft 30 and a stator 36 fixed to the inner peripheral surface of the casing 6 on the outer peripheral side of the rotor conductor 34. is there. When a current is passed through the coils constituting the stator 36, a rotating magnetic field is formed, and an induced current flows through the rotor conductor 34, so that the motor rotating shaft 30 is guided and rotated.

  In the compressor 2 that is rotationally driven by the motor 4, the fluid sucked from the inlet 38 is compressed (pressurized) by centrifugal force when passing through the impeller 40 provided on the compressor rotating shaft 32, and is then passed through the outlet 42. And sent to the outside of the compressor 2.

  Radial magnetic bearings 44 (44A to 44C) for supporting the rotating shaft 3 are provided on both sides of the motor 4 in the axial direction of the rotating shaft 3. The radial magnetic bearings (44 </ b> A to 44 </ b> C) cause the rotating shaft 3 to float by applying an attractive force along the radial direction to the rotating shaft 3 by electromagnetic force generated by energizing the electromagnet. Bear the load.

In the motor-integrated compressor 1 shown in FIG. 1, the thrust magnetic bearing 8 is provided between the compressor 2 and the motor 4.
The thrust magnetic bearing 8 includes at least one electromagnet 50 provided on the side of the thrust collar 10 provided on the rotary shaft 3 (two electromagnets (50a, 50b) provided on both sides of the thrust collar 10 in the example shown in FIG. )including. When the coils of the electromagnets (50a, 50b) are energized, the electromagnets are excited to generate electromagnetic force, and an attractive force is applied to the thrust collar 10 that is a magnetic material, thereby forming a gap between the electromagnet and the thrust collar 10. The thrust collar 10 is lifted as shown. Thus, the thrust magnetic bearing 8 is configured to receive a thrust load of the rotating shaft 3 by applying a magnetic force to the thrust collar 10 provided on the rotating shaft 3.

An access port 56 provided through the casing 6 along the radial direction of the rotary shaft 3 is formed in a portion of the casing 6 corresponding to the thrust magnetic bearing 8 in the axial direction of the rotary shaft 3.
Therefore, the outer peripheral side of the thrust collar 10 can be accessed via the access port 56 provided in the casing 6, and the balance weight described below can be easily attached to the recess provided in the thrust collar 10. it can.

  Next, a thrust collar 10 according to some embodiments will be described with reference to FIGS. 1 and 2 to 7. 2, 4 and 6 are diagrams each showing a configuration of a thrust collar according to an embodiment. 3, 5, and 7 are cross-sectional views of the balance collar mounting portion of the thrust collar shown in FIGS. 2, 4, and 6, respectively, and FIG. 3 is a cross-sectional view along the direction orthogonal to the rotation axis. FIG. 5 is a cross-sectional view along the rotation axis radial direction, and FIG. 7 is a cross-sectional view along the rotation axis direction.

As shown in FIG. 1 to FIG. 7, in some embodiments, the thrust collar 10 of the motor-integrated compressor 1 is formed with a recess 14, and at least one balance weight 12 is accommodated in the recess 14. The The balance weight 12 is made of a nonmagnetic material.
By configuring the balance weight with a non-magnetic material, the magnetic field that generates the magnetic force that acts on the thrust collar 10 hardly changes depending on whether the balance weight 12 is attached to the thrust collar 10 or not. Therefore, the rotational balance of the rotating body can be adjusted while suppressing the non-uniformity of the magnetic field in the thrust magnetic bearing 8.
Further, by forming the recess 14 in the thrust collar 10 and accommodating the balance weight 12 in the recess 14, the thrust collar 10 does not interfere with surrounding members when rotating.

  Examples of the nonmagnetic material constituting the balance weight 12 include a resin, a nonmagnetic metal such as nonmagnetic stainless steel (for example, SUS304, SUS305, 305M, SUS316, or SUS310S) or aluminum.

  In the embodiment shown in FIGS. 2 to 3 and 4 to 5, the recess 14 is formed on the outer peripheral surface 20 of the thrust collar 10. As described above, since the recess 14 for attaching the balance weight 12 is formed on the outer peripheral surface 20 of the thrust collar 10, the influence of the recess 14 on the magnetic field formed in the thrust magnetic bearing 8 can be reduced.

  Moreover, the recessed part 14 may be formed in the axial direction end surface 22 of the thrust collar 10 like embodiment shown in FIGS.

In the embodiment shown in FIGS. 2 to 3, the outer peripheral surface 20 of the thrust collar 10 is formed with a plurality of balance holes 16 as recesses 14 at different positions in the circumferential direction of the thrust collar 10. And accommodated in any one of the balance holes 16.
On the other hand, in the embodiment shown in FIGS. 6 to 7, the axial end surface 22 of the thrust collar 10 is formed with a plurality of balance holes 16 as the recesses 14 at different positions in the circumferential direction of the thrust collar 10. The weight 12 is accommodated in one of the balance holes 16. The balance hole 16 may be provided on the peripheral edge portion of the axial end surface 22 of the thrust collar 10. By arranging the balance hole 16 at the peripheral edge of the thrust collar 10, it is possible to reduce the influence of the balance hole 16 (recess 14) on the magnetic field formed in the thrust magnetic bearing 8.

In the embodiment shown in FIGS. 2 to 3 and 6 to 7, the balance hole 16 formed in the outer peripheral surface 20 or the axial end surface 22 of the thrust collar 10 is a screw hole in which a female screw is formed. Further, the balance weight 12 accommodated in the balance hole 16 is formed with a male screw that is screwed into a female screw formed in the balance hole 16.
In this way, by forming the balance hole 16 and the balance weight 12 with the female screw and the male screw, it is possible to suppress the balance weight 12 from jumping out in the circumferential direction when the rotary shaft 3 rotates by tightening the screw. Further, by forming the balance hole 16 and the balance weight 12 with a female screw and a male screw, the rotational balance of the rotating body including the rotating shaft 3 can be accurately adjusted according to the depth to which the screw is attached.

In the embodiment shown in FIGS. 4 to 5, a slot 18 is continuously formed in the circumferential direction as a recess 14 on the outer peripheral surface of the thrust collar 10, and at least one balance weight 12 is accommodated in the slot 18. Yes.
By forming the circumferentially continuous slot 18 as the recess 14, the presence of the recess 14 affects the magnetic field compared to the case where a plurality of holes (balance holes) are provided as the recess 14 at intervals in the circumferential direction. Can be relaxed.

  A hole 24 for fixing the balance weight 12 accommodated in the slot 18 is formed in the outer peripheral surface 20 of the thrust collar 10 shown in FIGS. The balance weight 12 is also formed with a fixing hole 26, and the balance weight 12 is fixed inside the slot 18 by a bolt 28 or the like through the hole 26 and the hole 24 formed in the thrust collar 10. Can do.

The slot 18 is a portion corresponding to the position where the hole 24 is formed in the circumferential direction of the thrust collar 10, and a portion between the narrow portion 17 and the narrow portion 17. And a large portion 19 having a wide width.
When the balance weight 12 shown in FIGS. 4 to 5 is attached, the balance weight 12 is inserted into the slot 18 through the large portion 19 having a relatively wide width, and moved in the slot 18 to the small width portion 17 in the circumferential direction. Then, the balance weight 12 is fixed to the slot 18 by fastening with bolts 28 or the like in the holes 24 and 26.
Although the balance weight 12 shown in FIGS. 4 to 5 has a block shape, the shape of the balance weight 12 is not limited as long as it can be accommodated in the slot 18. Therefore, the balance weight 12 having an appropriate mass (volume) can be selected and installed in the slot 18 as necessary.

  The balance adjustment method according to the embodiment of the rotary machine (motor-integrated compressor 1) described above includes a step of attaching at least one balance weight 12 made of a non-magnetic material to the thrust collar 10.

In the balance adjustment method according to the embodiment, first, in consideration of the weight balance of the rotating body including the rotating shaft 3, the mounting position of the balance weight 12 in the recess 14 provided in the thrust collar 10 and the weight of the balance weight 12 to be mounted. (Volume) and number are determined.
Next, the rotation shaft 3 is rotated so that the position at which the balance weight 12 is mounted on the thrust collar 10 is aligned with the position of the access port 56.
Then, the balance weight 12 is inserted into the recess provided in the thrust collar 10 from the access port 56 and fixed with screws or bolts.

The above-described motor-integrated compressor 1 compresses mining gas contained in resources mined in a gas field or oil field existing underground or on the seabed, and pumps the gas to, for example, an external processing facility or storage facility. It may be a compressor used for the above.
Further, the motor-integrated compressor 1 may be configured to be used by being installed in water such as the seabed or lake bottom.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The form which added the deformation | transformation to embodiment mentioned above and the form which combined these forms suitably are included.

In this specification, an expression representing a relative or absolute arrangement such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial”. Represents not only such an arrangement strictly but also a state of relative displacement with tolerance or an angle or a distance to obtain the same function.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
In this specification, expressions representing shapes such as quadrangular shapes and cylindrical shapes not only represent shapes such as quadrangular shapes and cylindrical shapes in a strict geometric sense, but also within a range where the same effects can be obtained. In addition, a shape including an uneven portion or a chamfered portion is also expressed.
In this specification, the expression “comprising”, “including”, or “having” one constituent element is not an exclusive expression for excluding the existence of another constituent element.

DESCRIPTION OF SYMBOLS 1 Motor-integrated compressor 2 Compressor 3 Rotating shaft 4 Motor 6 Casing 8 Thrust magnetic bearing 10 Thrust collar 12 Balance weight 14 Recess 16 Balance hole 17 Narrow part 18 Slot 19 Large part 20 Outer peripheral surface 22 Axial end face 24 Hole 26 Hole 28 Bolt 30 Motor rotating shaft 32 Compressor rotating shaft 34 Rotor conductor 36 Stator 38 Inlet 40 Impeller 42 Outlet 44 Radial magnetic bearing 50 Electromagnet 56 Access port

Claims (10)

A rotation axis;
A thrust magnetic bearing configured to receive a thrust load of the rotating shaft by applying a magnetic force to a thrust collar provided on the rotating shaft;
And at least one balance weight attached to the thrust collar,
The rotating machine is characterized in that the balance weight is made of a non-magnetic material.   The rotating machine according to claim 1, wherein the at least one balance weight is accommodated in a recess formed in the thrust collar.   The rotating machine according to claim 2, wherein the recess is formed on an outer peripheral surface of the thrust collar. On the outer peripheral surface of the thrust collar, a plurality of balance holes as the recesses are formed at different positions in the circumferential direction of the thrust collar,
The rotating machine according to claim 3, wherein each of the balance weights is accommodated in one of the balance holes. The balance hole is a screw hole in which a female screw is formed,
The rotating machine according to claim 4, wherein the balance weight is formed with a male screw that is screwed into the female screw. On the outer peripheral surface of the thrust collar, slots as the concave portions are continuously formed in the circumferential direction,
The rotating machine according to claim 2 or 3, wherein the at least one balance weight is accommodated in the slot.   The rotary machine according to claim 2, wherein the recess is formed on an axial end surface of the thrust collar.   The said rotary machine is a motor integrated compressor with which the compressor and the motor for driving this compressor were accommodated in the same casing, The Claim 1 thru | or 7 characterized by the above-mentioned. Rotating machine.   The rotating machine according to claim 8, wherein the thrust magnetic bearing is provided between the compressor and the motor. A rotation axis;
A thrust magnetic bearing configured to receive a thrust load of the rotating shaft by applying a magnetic force to a thrust collar provided on the rotating shaft,
A method for adjusting the balance of a rotating machine, comprising the step of attaching at least one balance weight made of a non-magnetic material to the thrust collar.

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