JP2017137845A - Screw compressor and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate gap adjustment in an air gap of a motor, in a screw compressor of a three-point supporting structure.SOLUTION: A screw compressor 1 includes: a compressor body 2; a motor 5 which has a motor casing 10, a rotator 7, a stator 8, and a motor shaft portion 31 coaxially with a rotor shaft portion 21 of a screw rotor 3 on a load side and extending to an opposite load side; a motor side bearing 32 which supports an opposite load side end portion 15 of the motor shaft portion; a motor side bearing casing 40 which stores the motor side bearing so as to adjust an axial position on the opposite load side of the motor shaft portion, and is attached to the motor casing 10 so as to adjust a position; and a plurality of through-holes 50 for inserting/extracting a gap adjusting member 55 detachably inserted into an air gap 13 between the rotator and the stator of the motor, which is provided on at least one of the motor side bearing casing and the motor casing, and is arranged so as to oppose to the air bag in an axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a screw compressor.

  Patent Document 1 discloses a screw compressor that supports a shared rotor shaft in which a rotor shaft of a screw rotor and a rotor shaft of a motor extend coaxially by a rotor side roller bearing, an intermediate roller bearing, and a motor side roller bearing. A point support structure is disclosed.

JP 2002-122084 A

  In the screw compressor disclosed in Patent Document 1, centering that depends on the component accuracy and processing accuracy of the shared rotor shaft and the assembly accuracy between the shared rotor shaft and the three bearings is performed. If the shaft core does not match between the shaft and the bearing, the bearing load increases. If the axis of the motor and the stator are not aligned, the air gap between the rotor and the stator becomes uneven, and a strong magnetic force is generated in a narrow gap in the air gap. . As a result, the bearing load increases and the life and reliability of the bearing decreases.

  In particular, in a screw compressor having a three-point support structure, since the processing error and assembly error of the rotor, stator, shaft, bearing, and casing constituting the motor are accumulated and the accumulated error becomes large, the motor air gap It is difficult to adjust the gap.

  Therefore, the technical problem to be solved by the present invention is to facilitate the gap adjustment in the air gap of the motor in the screw compressor having the three-point support structure.

  In order to solve the above technical problem, according to the present invention, the following screw compressor is provided.

That is, the screw compressor
A compressor body in which a screw rotor is housed in a rotor casing;
A motor having a motor casing, a rotor, a stator, and a motor shaft portion that is coaxial with the rotor shaft portion of the screw rotor on the load side and extends to the opposite load side;
A motor-side bearing that supports the non-load side of the motor shaft;
A motor-side bearing casing that accommodates the motor-side bearing and is attached to the motor casing so as to be position-adjustable so as to adjust the axial center position of the motor shaft portion on the non-load side;
A through hole for inserting and removing a gap adjusting member that is detachably inserted into an air gap between the rotor and stator of the motor, and is at least one of the motor side bearing casing and the motor casing And a plurality of through holes arranged to face the air gap in the axial direction.

  According to the above configuration, a plurality of gap adjustment members are detachably inserted into the air gap through a plurality of through holes, whereby the gap in the motor air gap can be made uniform, and the gap adjustment in the motor air gap is easy. Can be done.

  In addition to the above features, the present invention can have the following features.

  At least three of the through holes are provided substantially evenly in the circumferential direction of the shaft core. According to the said structure, the gap adjustment in the air gap of a motor can be performed easily.

  A position adjusting unit for adjusting the position of the motor side bearing casing is provided. According to the said structure, the gap adjustment operation | work with the air gap of a motor performed resisting the magnetic force from a stator becomes easy.

An assembly method of the screw compressor of the present invention is an assembly method of the screw compressor,
The rotor fixed to the motor shaft is attached to the stator fixed to the motor casing, and the rotor casing and the motor casing are coupled,
The motor side bearing is attached to the non-load side of the motor shaft,
The motor side bearing casing is mounted on the motor casing so as to accommodate the motor side bearing,
Inserting the gap adjustment member into the air gap through each of the through holes, and adjusting the gap in the air gap,
Fixing the motor side bearing casing to the motor casing;
The gap adjusting member inserted into the air gap is taken out through each of the through holes.

  According to the above method, the screw compressor is roughly assembled, a plurality of gap adjusting members are inserted into the air gap, the gap adjustment at the air gap is performed, the motor side bearing casing is fixed to the motor casing, and then all gap adjustments are made. The member is removed. Therefore, the gap adjustment in the air gap of the motor can be easily performed.

  According to the present invention, in a screw compressor having a three-point support structure, gap adjustment at the air gap of the motor can be easily performed.

The cross-sectional view of the screw compressor which concerns on 1st Embodiment of this invention. The side view of the screw compressor shown in FIG. The principal part expanded sectional view explaining the assembly method of the screw compressor shown in FIG. The principal part expanded sectional view explaining the assembly method of the screw compressor following FIG. The principal part expanded sectional view explaining the assembly method of the screw compressor following FIG. The principal part expanded sectional view explaining the assembly method of the screw compressor following FIG. The principal part expanded sectional view explaining the assembly method of the screw compressor following FIG. The principal part expanded sectional view explaining the assembly method of the screw compressor following FIG. The cross-sectional view of the screw compressor which concerns on 2nd Embodiment of this invention. The side view of the screw compressor shown in FIG.

  First, the screw compressor 1 which concerns on 1st Embodiment of this invention is demonstrated, referring FIGS. 1-8.

  Drawing 1 is a figure showing roughly the cross section of screw compressor 1 concerning a 1st embodiment. This screw compressor 1 is an oil-free screw compressor. A pair of screw rotors 3 made up of a male rotor and a female rotor that mesh with each other in an oil-free state are accommodated in a rotor casing 4 of the compressor body 2. A rotor-side bearing casing 24 is attached to one end of the rotor casing 4. A connecting flange portion 18 of the motor casing 10 of the motor 5 is attached to the other end portion of the rotor casing 4. The motor casing 10 includes a motor casing body 6 and a cooling jacket 9. A cooling jacket 9 is detachably attached to the motor casing body 6. A motor side bearing casing 40 and a bearing retainer 45 are attached to the motor side wall portion 16 of the cooling jacket 9.

  A gas discharge port (not shown) is formed on the motor 5 side of the rotor casing 4, and a gas suction port (not shown) is formed on the rotor side bearing casing 24 side of the rotor casing 4. Usually, the male rotor is rotationally driven by the motor 5. Due to the rotational drive of the motor shaft portion 31 of the motor 5, the male rotor shaft portion of the male rotor rotates, and further, the female rotor shaft portion of the female rotor rotates so as to synchronize with the male rotor shaft portion via the timing gear.

  The motor 5 is a drive source for rotating the rotor shaft portion 21 (usually a male rotor shaft portion) of the screw rotor 3. The rotation speed of the motor 5 is controlled by an inverter (not shown), and the motor 5 is operated at a high speed rotation exceeding 20000 rpm. A rotor (rotor) 7 and a stator (stator) 8 of the motor 5 are accommodated in the motor chamber 12 of the motor casing 10. The rotor 7 of the motor 5 is fixed to the outer peripheral portion of the motor shaft portion 31. The stator 8 is disposed outside the rotor 7 so as to be separated from the rotor 7 and is attached to the inner peripheral portion of the motor casing 10 (the cooling jacket 9 in the present embodiment). An air gap 13 having a minute gap (for example, about 1 mm) is formed between the rotor 7 and the stator.

  In the motor casing 10, the cooling jacket 9 is disposed between the stator 8 and the motor casing body 6. The cooling jacket 9 is attached to the inner peripheral portion of the motor casing main body 6 and tightened with a plurality of bolts in a state where the flange portions are in contact with each other, whereby the cooling jacket 9 is integrally fixed to the motor casing main body 6. ing. The cooling jacket 9 is formed with a cooling passage for flowing a coolant such as cooling water, cooling oil or cooling gas. The outer peripheral part of the cooling jacket 9 and the inner peripheral part of the motor casing body 6 are sealed with packing.

  As shown in FIG. 3, the rotating shaft 11 includes a rotor shaft portion 21 of the screw rotor 3 and a motor shaft portion 31 of the motor 5, which are separate bodies. As shown in FIG. 4, the rotor shaft portion 21 and the motor shaft portion 31 extend coaxially in the horizontal direction (lateral direction). That is, the motor shaft portion 31 is coaxial with the rotor shaft portion 21 on the load side and extends to the opposite load side. The shaft diameter of the motor shaft portion 31 of the motor 5 is larger than the shaft diameter of the rotor shaft portion 21 of the screw rotor 3. A connecting hole 36 for inserting the connecting end portion 26 on the motor 5 side of the rotor shaft portion 21 is formed in the motor shaft portion 31 having a large diameter. An insertion hole 33 having a smaller diameter than the connection hole 36 is formed in the motor shaft portion 31. Due to the insertion hole 33 and the connection hole 36, the inside of the motor shaft portion 31 penetrates in the axial direction. A screw hole 27 is formed in the rotor shaft portion 21 on the motor 5 side of the connecting end portion 26.

  An engagement recess 39 (for example, a key groove having a rectangular cross section and a concave shape) is formed in the inner peripheral portion of the coupling hole 36 of the motor shaft portion 31. A coupling member 29 (for example, a key) is fitted in the engagement recess 39 of the connection hole 36, and the motor shaft portion 31 and the rotor shaft portion 21 are integrally connected.

  As shown in FIG. 7, the screw portion of the fastening bolt 34 is screwed into the screw hole 27 of the connecting end portion 26. The motor shaft portion 31 and the rotor shaft portion 21 are fastened by tightening the motor shaft portion 31 in the axial direction with the fastening bolt 34. Thus, the motor shaft portion 31 and the rotor shaft portion 21 are integrally connected by the coupling member 29, and the motor shaft portion 31 and the rotor shaft portion 21 are fastened by the fastening bolts 34.

  As shown in FIG. 1, the opposite side of the motor 5 in the rotor shaft portion 21 is supported by a rotor side bearing 22 disposed in a rotor side bearing casing 24. The motor shaft 5 side of the rotor shaft portion 21 is supported by an intermediate bearing 23 disposed in the rotor casing 4. That is, the rotor shaft portion 21 is supported by the rotor-side bearing 22 and the intermediate bearing 23 in both ends. The anti-load side end 15 located on the anti-load side of the motor shaft portion 31 is supported by a motor-side bearing 32 disposed in the motor-side bearing casing 40. Therefore, the screw compressor 1 has a three-point support structure in which the rotary shaft 11 composed of the rotor shaft portion 21 and the motor shaft portion 31 is supported at three locations of the rotor side bearing 22, the intermediate bearing 23, and the motor side bearing 32. It has.

  The rotor-side bearing 22 is composed of, for example, a thrust bearing (4-point contact ball bearing) and a radial bearing (roller bearing). The intermediate bearing 23 includes, for example, a radial bearing (roller bearing) and a thrust bearing (4-point contact ball bearing). The motor side bearing 32 is comprised from a radial bearing (deep groove ball bearing), for example.

  A shaft seal portion (not shown) is provided in the rotor shaft portion 21 between the rotor-side bearing 22 and the screw rotor 3 and in the rotor shaft portion 21 between the screw rotor 3 and the intermediate bearing 23, respectively. It has been.

  The motor side bearing casing 40 includes a bearing support portion 41 that protrudes inward of the motor casing 10. The motor side bearing 32 is supported by the bearing support portion 41. The inner ring of the motor-side bearing 32 is positioned so as not to move in the axial direction by a locking nut arranged at the non-load-side end 15 of the motor shaft 31. A spring member 44 (for example, a wave spring) is disposed between the outer ring of the motor side bearing 32 and the holding portion 46 of the bearing holder 45. Since the outer ring of the motor side bearing 32 is pressed by a spring member 44 (for example, a wave spring), the outer ring of the motor side bearing 32 is elastically held and can be displaced in the axial direction. That is, the motor side bearing 32 is assembled to the motor side bearing casing 40 so as to allow axial displacement of the outer ring. According to this configuration, even if the motor shaft portion 31 expands and contracts due to thermal expansion, it is possible to prevent an excessive load from being applied to the motor-side bearing 32.

  A motor side bearing casing 40 is attached to the cooling jacket 9 of the motor casing 10. The motor-side bearing casing 40 is fixed to the cooling jacket 9 by tightening the support flange portion 42 of the motor-side bearing casing 40 with a plurality of bolts in contact with the motor-side end surface 17 of the cooling jacket 9. The space between the motor side end surface 17 of the cooling jacket 9 and the inner side surface of the support flange portion 42 of the motor side bearing casing 40 is sealed by packing.

  A bearing retainer 45 is attached to the motor side bearing casing 40 so as to close the opening of the motor side bearing casing 40. The bearing retainer 45 is fixed to the motor-side bearing casing 40 by tightening the retaining flange portion 47 of the bearing retainer 45 with a plurality of bolts in a state where the retaining flange portion 47 is in contact with the support flange portion 42 of the motor-side bearing casing 40. The gap between the inner peripheral portion of the bearing support portion 41 of the motor side bearing casing 40 and the outer peripheral portion of the pressing portion 46 of the bearing retainer 45 is sealed with packing. Accordingly, the opening 35 of the cooling jacket 9 of the motor casing 10 is closed by the motor side bearing casing 40 and the bearing retainer 45.

  A plurality of through holes 50 are provided in the support flange portion 42 of the motor side bearing casing 40. The plurality of through holes 50 penetrate the support flange portion 42 in the axial direction. The plurality of through holes 50 are arranged so as to face the air gap 13 formed between the rotor 7 and the stator 8 in the axial direction. The plurality of through holes 50 are provided substantially evenly in the circumferential direction of the shaft core. The plurality of through holes 50 are at least three, preferably four. As shown in FIG. 2, the four through holes 50 are arranged substantially evenly at an angle of 90 degrees in the vertical and horizontal positions.

  The plurality of through holes 50 are holes for inserting and removing the gap adjusting member 55 that is detachably inserted into the air gap 13. When the gap of the air gap 13 is about 1 mm, for example, a rod-shaped gap adjusting member 55 having a rectangular cross section having a thickness of about 0.9 mm and a width of 4 mm is used. The gap adjusting member 55 has a length that can be inserted up to about half of the axial length of the air gap 13, for example. By inserting a plurality of gap adjusting members 55 into the air gap 13 through the through holes 50, the gap of the air gap 13 can be adjusted uniformly. In this way, the axial center position of the motor shaft portion 31 on the side opposite to the load can be adjusted. After performing the gap adjustment of the air gap 13, all of the gap adjusting members 55 are taken out, and all of the through holes 50 are closed with screw plugs or other plugs, whereby the motor chamber 12 is closed.

  According to the said structure, the gap adjustment in the air gap 13 of the motor 5 can be easily performed by inserting the several gap adjustment member 55 in the air gap 13 so that attachment or detachment is possible through the several through-hole 50. FIG.

  Next, a method for assembling the screw compressor 1 will be described.

  As shown in FIGS. 3 and 4, the connecting end portion 26 of the rotor shaft portion 21 is inserted into the connecting hole 36 of the motor shaft portion 31 including the rotor 7, and the coupling member 29 of the connecting end portion 26 is connected to the connecting hole. It fits in 36 engaging recesses 39. Thereby, the rotating shaft 11 in which the motor shaft portion 31 and the rotor shaft portion 21 are integrally connected is formed.

  As shown in FIGS. 5 and 6, the motor casing 10 is attached to the rotor casing 4 such that the inner peripheral portion of the stator 8 is along the outer peripheral portion of the rotor 7. After positioning so that the stator 8 faces the rotor 7 accurately, the coupling flange portion 18 of the motor casing 10 is fixed to the other end portion of the rotor casing 4 by a plurality of bolts. Thereby, although the stator 8 is positioned with respect to the rotor 7, the gap of the air gap 13 is not equal.

  As shown in FIG. 7, a motor-side bearing 32 is attached to the non-load-side end 15 of the motor shaft 31 and is fixed with a locking nut. At the same time, the fastening bolt 34 is inserted into the insertion hole 33 and the screw hole 27, and the screw portion of the fastening bolt 34 is screwed into the screw hole 27 of the connecting end portion 26. By tightening the motor shaft portion 31 in the axial direction by the fastening bolt 34, the rotor shaft portion 21 and the motor shaft portion 31 are fastened. As a result, the rotating shaft 11 extending coaxially and integrated with the rotor shaft portion 21 and the motor shaft portion 31 is configured.

  As shown in FIG. 8, the motor-side bearing casing 40 is attached to the cooling jacket 9 through the opening 35. A motor-side bearing 32 attached to the non-load-side end 15 of the motor shaft portion 31 is supported by the bearing support portion 41. The gap adjusting members 55 are inserted through the through holes 50 of the motor side bearing casing 40 until the plurality of gap adjusting members 55 are inserted into the air gap 13. Thereby, the gap of the air gap 13 is adjusted equally. In this way, the axial center position of the motor shaft portion 31 on the side opposite to the load is adjusted. This adjustment is performed before the support flange portion 42 of the motor side bearing casing 40 is fixed to the motor side end surface 17 of the cooling jacket 9. The motor-side bearing casing 40 is bolted to the cooling jacket 9 with the support flange portion 42 of the motor-side bearing casing 40 in contact with the motor-side end surface 17 of the motor side wall portion 16 of the cooling jacket 9. Thereby, the motor side bearing casing 40 is fixed to the cooling jacket 9 of the motor casing 10.

  As shown in FIG. 1, the bearing retainer 45 is mounted on the motor-side bearing casing 40 with the spring member 44 interposed. The bearing retainer 45 is bolted to the motor side bearing casing 40 in a state where the retaining flange portion 47 of the bearing retainer 45 is in contact with the support flange portion 42 of the motor side bearing casing 40. Thereby, the bearing retainer 45 is fixed to the motor side bearing casing 40, and the adjusted gap of the air gap 13 is fixed. And after all the gap adjustment members 55 are taken out from each of the through holes 50, all the through holes 50 are closed with screw plugs or other plugs.

  According to the above assembling method, the screw compressor 1 is roughly assembled, a plurality of gap adjusting members 55 are inserted into the air gap 13, the gap is adjusted in the air gap 13, and the motor side bearing casing 40 is fixed to the motor casing 10. After that, all the gap adjusting members 55 are taken out. Therefore, the gap adjustment in the air gap 13 of the motor 5, that is, the adjustment of the axial center position of the motor shaft portion 31 on the non-load side can be easily performed.

In addition, as a modification of the above assembling method, the following modes can be adopted.
That is, the stator 8 attached to the motor casing 10 is attached to the rotor 7 attached to the motor shaft portion 31 with a plurality of gap adjusting members 55 interposed in the air gap 13 in advance. The casing 4 and the motor casing 10 are combined,
The motor side bearing 32 is attached to the non-load side end 15 of the motor shaft portion 31,
The motor side bearing casing 40 is mounted and fixed to the motor casing 10 so as to accommodate the motor side bearing 32,
An assembly method in which all of the gap adjusting member 55 interposed in the air gap 13 is taken out through the through hole 50 may be employed.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, components having the same functions as the components in the first embodiment are given the same reference numerals, and redundant descriptions are omitted.

  The screw compressor 1 according to the second embodiment adjusts the position of the motor-side bearing casing 40, that is, the motor-side bearing 32, thereby adjusting the position of the motor shaft 31 on the side opposite to the load of the motor shaft 31. 60.

  The position adjustment unit 60 includes an adjustment protrusion 61 and an adjustment screw 62. The adjustment screw 62 includes a screw portion and a head portion. The adjustment protrusion 61 protrudes outward from the outer surface of the motor side wall portion 16 of the cooling jacket 9 and has a screw hole to be screwed with the screw portion of the adjustment screw 62. The position adjusting unit 60 is disposed at four locations so as to face the contact surface 65 of the motor side bearing casing 40. For example, as shown in FIG. 10, in order to adjust the position of the motor-side bearing casing 40 in the up / down / left / right directions, the position adjusting portions 60 are respectively arranged at predetermined positions in the up / down / left / right directions. The end of the adjustment screw 62 of the position adjustment unit 60 is in contact with the contact surface 65 of the motor side bearing casing 40.

  Since a strong magnetic force is generated from the permanent magnet of the stator 8 of the motor 5, it is necessary to perform a gap adjustment operation in the air gap 13 against the strong magnetic force. In the screw compressor 1 including the position adjusting unit 60, the vertical adjustment position of the motor side bearing casing 40 is adjusted by appropriately moving the four adjustment screws 62 that are in contact with the contact surface 65. Can do. Therefore, the position of the motor-side bearing 32 accommodated in the motor-side bearing casing 40 can be easily adjusted, and the gap adjustment work in the air gap 13 is facilitated.

  The configuration of the position adjustment unit 60 is not limited to the above embodiment. For example, each of the vertical position adjusting unit and the left / right position adjusting unit is provided, and one vertical elastic adjusting unit facing the vertical position adjusting unit and one horizontal adjusting unit facing the left / right position adjusting unit. It can also be set as an aspect provided with an elastic adjustment part. The up-down elastic adjustment unit and the left-right elastic adjustment unit bias the motor-side bearing casing 40 toward the up-down position adjustment unit and the left-right position adjustment unit against the magnetic force from the stator 8. An elastic body configured to provide power. Therefore, it is possible to adjust each position of the motor-side bearing casing 40 in the vertical direction and the horizontal direction by using two adjustment screws of the vertical position adjustment unit and the horizontal position adjustment unit.

  The arrangement of the through holes 50 is not limited to the above embodiment. The through hole 50 can also be provided in the motor side wall 16 so as to penetrate the motor side wall 16 of the cooling jacket 9 (that is, the motor casing 10). Further, the through hole 50 penetrates through the portion where the support flange portion 42 of the motor side bearing casing 40 and the motor side wall portion 16 of the cooling jacket 9 (that is, the motor casing 10) overlap each other. It can also be provided in both parts 16.

  The configuration of the motor casing 10 is not limited to the above embodiment. The motor casing body 6 may extend to the support flange portion 42 of the motor side bearing casing 40, and the motor side wall portion of the motor casing body 6 may be in contact with the support flange portion 42 of the motor side bearing casing 40. In this case, the motor side bearing casing 40 is attached to the motor casing body 6.

  The structure of the rotating shaft 11 is not limited to the said embodiment. The rotary shaft 11 can be configured such that the shaft diameter of the rotor shaft portion 21 is larger than the shaft diameter of the motor shaft portion 31. Moreover, the rotating shaft 11 can also be made into one shaft body with which the rotor shaft part 21 and the motor shaft part 31 are comprised continuously. The present invention can also be applied to an oil-cooled screw compressor 1 in which cooling oil is introduced into the rotor chamber of the rotor casing 4.

1: Screw compressor 2: Compressor body 3: Screw rotor 4: Rotor casing 5: Motor 6: Motor casing body 7: Rotor (rotor)
8: Stator (stator)
9: Cooling jacket 10: Motor casing 11: Rotating shaft 12: Motor chamber 13: Air gap 15: Anti-load side end 16: Motor side wall 17: Motor side end 18: Coupling flange 21: Rotor shaft 22: Rotor Side bearing 23: Intermediate bearing 24: Rotor side bearing casing 26: Connection end 27: Screw hole 29: Coupling member 31: Motor shaft 32: Motor side bearing 33: Insertion hole 34: Fastening bolt 35: Opening 36: Connection Hole 38: Fastening nut 39: Engaging recess 40: Motor-side bearing casing 41: Bearing support portion 42: Support flange portion 44: Spring member 45: Bearing retainer 46: Presser portion 47: Presser flange portion 50: Through hole 55: Gap Adjustment member 60: Position adjustment part 61: Adjustment protrusion 62: Adjustment screw 65: Contact surface

Claims (4)

A compressor body in which a screw rotor is housed in a rotor casing;
A motor having a motor casing, a rotor, a stator, and a motor shaft portion that is coaxial with the rotor shaft portion of the screw rotor on the load side and extends to the opposite load side;
A motor-side bearing that supports the non-load side of the motor shaft;
A motor-side bearing casing that accommodates the motor-side bearing and is attached to the motor casing so as to be position-adjustable so as to adjust the axial center position of the motor shaft portion on the non-load side;
A through hole for inserting and removing a gap adjusting member that is detachably inserted into an air gap between the rotor and stator of the motor, and is at least one of the motor side bearing casing and the motor casing A screw compressor comprising: a plurality of through-holes provided to be opposed to the air gap in the axial direction. The screw compressor according to claim 1,
A screw compressor, wherein at least three of the through holes are provided substantially evenly in the circumferential direction of the shaft core. In the screw compressor according to claim 1 or 2,
A screw compressor comprising a position adjusting unit for adjusting the position of the motor side bearing casing. A compressor body in which a screw rotor is housed in a rotor casing;
A motor having a motor casing, a rotor, a stator, and a motor shaft portion that is coaxial with the rotor shaft portion of the screw rotor on the load side and extends to the opposite load side;
A motor-side bearing that supports the non-load side of the motor shaft;
A motor-side bearing casing that accommodates the motor-side bearing and is attached to the motor casing so as to be position-adjustable so as to adjust the axial center position of the motor shaft portion on the non-load side;
A through hole for inserting and removing a gap adjusting member that is detachably inserted into an air gap between the rotor and stator of the motor, and is at least one of the motor side bearing casing and the motor casing A screw compressor assembly method comprising: a plurality of through holes provided to face the air gap in an axial direction;
The rotor fixed to the motor shaft is attached to the stator fixed to the motor casing, and the rotor casing and the motor casing are coupled,
The motor side bearing is attached to the non-load side of the motor shaft,
The motor side bearing casing is mounted on the motor casing so as to accommodate the motor side bearing,
Inserting the gap adjustment member into the air gap through each of the through holes, and adjusting the gap in the air gap,
Fixing the motor side bearing casing to the motor casing;
An assembly method of a screw compressor, wherein the gap adjusting member inserted into the air gap is taken out through each of the through holes.

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