JP2000205152A - Scroll compresser and assembling method and assembling device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely position a frame, the stator of an electric motor, and a sub-frame, and facilitate the regulation of the air gap by forming an outer diameter reference plane concentrically with the inside diameter on the circumferential surface of the core of the stator whose core is nipped by the frame and sub-frame for the electric motor. SOLUTION: An inside diameter reference plane 30a and an outside diameter reference plane 30b are formed on a sub-frame 30 for supporting a trochoid pump, which has a bearing 31 in the center, and a horizontal reference plane 30c is also formed thereon. An electric motor is formed of a stator 36a having a core nipped between a frame 25 and a sub-frame 30 and a rotor arranged within the stator 36a, and an outer diameter reference plane 36c is formed on the circumferential surface of the core of the stator 36a. This electric motor is placed on a pallet 38, a stator positioning means is set, and the outer diameter reference plane 36c is pressed by a pressing means to position the stator, and the sub-frame 30 is then positioned by use of a sub-frame positioning means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a structure, an assembling method, and an assembling apparatus for accurately assembling a frame, a stator of a motor, and a subframe.

[0002]

2. Description of the Related Art FIG. 18 is a sectional view showing the structure of a conventional scroll compressor. In the drawing, 1 is a cylindrical center shell having openings at both ends, and 2 and 3 are dish-shaped upper and lower end shells arranged to close both openings of the center shell 1, respectively. 3, a closed shell 4 is formed. Reference numeral 5 denotes a frame fixed to the inner surface of the side wall of the center shell 1 and provided with a first bearing portion 5a at the center. Reference numeral 6 denotes a spiral plate 6b formed on a base plate 6a fixedly supported on the upper end surface of the frame 5. The fixed scroll 7 is supported by the frame 5 so as to be swingable.
The scroll 6b of the fixed scroll 6 has a spiral direction opposite to that of the spiral 6b, and is formed with a spiral 7b forming a compression chamber 8 by being combined with each other.

A suction pipe 9 is disposed through the side wall of the center shell 1 and a suction pipe communicating between the inside and the outside of the closed shell 4. A suction pipe 9 is disposed through the upper end shell 2 and communicates with the discharge side of the compression chamber 8. A discharge pipe 11 communicating with the outside of the closed shell 4 is fixed to the inner surface of the side wall of the center shell 1, partitions the lower part of the closed shell 4 to form an oil reservoir 12, supports the trochoid pump 13, and supports a trochoid pump 13 at the center. 2, a sub-frame provided with a bearing 14 as a bearing portion, 15 is a lubricating oil stored in an oil reservoir 12, 16 is a first bearing portion 5a of the frame 5 and a bearing 14 at both ends, and an upper end is provided. An oil hole 16a is formed in the center of the main shaft connected to the orbiting scroll 7 so as to pass therethrough. Reference numeral 17 denotes a stator 17a carried on the upper end of the subframe 11 and the stator 17a
The motor is constituted by a rotor 17b disposed at the center of the rotor 17b. The main shaft 16 passes through the center of the rotor 17b and is integrated therewith.

In the scroll compressor configured as described above, first, when the electric motor 17 including the stator 17a and the rotor 17b is driven to rotate the main shaft 16, the base plate 7a of the orbiting scroll 7 is moved to the frame 5 The low-pressure refrigerant gas, which starts oscillating motion above and is introduced from the outside via the suction pipe 9, is sucked into the compression chamber 8 by the compression action of the scrolls 6, 7, and is compressed to produce the high-pressure refrigerant gas. After that, it is led out of the closed shell 4 through the discharge pipe 10.

However, in the scroll compressor configured as described above, the frame 5 and the sub-frame 1
1 is fitted to and fixed to the inner periphery of the center shell 1, so that the first bearing portion 5a and the bearing 14 that support the main shaft 16 are concentrically arranged. Since the cylindricity must be machined with high accuracy, the machining cost of the center shell 1 is increased, and the scroll compressor itself is expensive.

For this reason, for example, Japanese Patent Application Laid-Open No. 61-40472
In the scroll compressor disclosed in the above publication, the stator 17a of the electric motor 17 and the sub-frame 11 are integrated by fastening the frame 5 with bolts 18 through the stator 17a as shown in FIG. The configuration in which the first and second bearing portions 5a and 14 are concentrically arranged without processing the cylindricity of the center shell 1 with high accuracy by adopting a configuration in which they are fixed together.

[0007]

As described above, in the conventional scroll compressor, the stator 17a of the electric motor 17 and the sub-frame 11 are integrated with the frame 5 by fastening them with the through bolts 18, and only the frame 5 is centered. Although the first bearing portion 5a and the bearing 14 can be concentrically arranged without machining the cylindricity of the center shell 1 with high precision because the first shell portion 5 is fitted and fixed to the shell 1. In order to adjust the air gap of the electric motor 17, it is necessary to insert a clearance gauge between the stator 17a and the rotor 17b, for example, and there is a problem that workability is extremely poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a scroll compressor capable of accurately positioning a frame, a stator of a motor and a sub-frame, and easily adjusting an air gap. And an assembling method and an assembling apparatus thereof.

[0009]

According to a first aspect of the present invention, there is provided a scroll compressor in a compression chamber formed by combining a hermetic shell and a swirling refrigerant gas accommodated in the hermetic shell. A fixed scroll and an orbiting scroll that are gradually compressed and discharged, a frame fixed to the inner wall surface of the hermetic shell, supporting the fixed scroll and the orbiting scroll, and having a first bearing at a central portion; , A subframe having a second bearing portion coaxially with the first bearing portion, a stator having a core sandwiched between the frame and the subframe, and a rotor disposed at a central portion of the stator. And a rotor which is integrated with the rotor of the motor, and both ends of which are supported by first and second bearing portions and one end of which is a swinging scroll. Compressor having a main shaft connected to the stator and a through bolt that penetrates through the subframe and the stator core of the electric motor and fastens them to the frame, is formed on the outer peripheral surface of the stator core coaxially with the inner diameter. The outer diameter reference surface is provided.

According to a second aspect of the present invention, there is provided a method of assembling a scroll compressor, comprising the steps of: positioning a frame with reference to a first bearing portion; Positioning the sub-frame with respect to the positioned frame with reference to the second bearing portion, and positioning the sub-frame with respect to the positioned frame, the stator of the motor being positioned. And fastening the sub-frame to the frame via bolts.

According to a third aspect of the present invention, there is provided an apparatus for assembling a scroll compressor, comprising: frame positioning means for positioning and holding a frame on which a stator and sub-frames of an electric motor are stacked, and a frame which is positioned. Motor stator positioning means for positioning the stator of the upper motor relative to the frame by pressing an outer diameter reference surface formed coaxially with the inner diameter on the outer peripheral surface of the core with respect to the frame, and the stator of the positioned motor A sub-frame positioning means for positioning the upper sub-frame relative to the frame by pressing an outer diameter reference surface set on the basis of the second bearing portion from the radial direction, and a bolt passing through the stator and the sub-frame of the electric motor. And a bolt fastening means for fastening to the frame through the intermediary.

According to a fourth aspect of the present invention, there is provided the scroll compressor assembling apparatus according to the third aspect, wherein the frame positioning means includes a positioning seat for supporting a horizontal reference surface formed on the frame and a projection protruding from the positioning seat. And a pallet provided with positioning pins which are fitted into positioning reference holes formed in the frame and formed in cooperation with the positioning seat to position the frame.

According to a fifth aspect of the present invention, there is provided the scroll compressor assembling apparatus according to the third aspect, wherein the stator positioning means of the electric motor is disposed at a predetermined interval in the circumferential direction and is moved in the radial direction. A plurality of stator moving mechanisms for moving the stator core of the electric motor to a predetermined position on the frame by pressing an outer diameter reference surface formed coaxially with the inner diameter on the outer peripheral surface thereof with a positioning member; A plurality of stator pressing mechanisms which are disposed correspondingly to the sides opposite to each of the stator moving mechanisms and move in the radial direction to press the stator of the electric motor against the positioning member with a pressing force smaller than the pressing force of the positioning member of the stator moving mechanism; It is composed of

According to a sixth aspect of the present invention, there is provided the scroll compressor assembling apparatus according to the fifth aspect, wherein the predetermined position on the frame is determined by setting the stator to a reference member provided on a pallet on which the frame is positioned. This is set by the contact of the moving mechanism.

According to a seventh aspect of the present invention, in the scroll compressor assembling apparatus according to the third aspect, the sub-frame positioning means is disposed at a predetermined interval in the circumferential direction and is moved in the radial direction. A plurality of sub-frame moving mechanisms for moving the sub-frame to a predetermined position on the stator of the electric motor by pressing an outer diameter reference surface formed coaxially with the second bearing portion on an outer peripheral surface thereof with a positioning member; A plurality of sub-frames which are disposed in correspondence with the respective sides opposite to each sub-frame moving mechanism and move in the radial direction to press the sub-frame against the positioning member with a pressing force smaller than the pressing force of the positioning member of the sub-frame moving mechanism. It comprises a frame pressing mechanism.

According to a third aspect of the present invention, in the scroll compressor assembling apparatus according to the third or seventh aspect, the sub-frame positioning means predicts a moving amount of the sub-frame generated when the through bolt is fastened. In addition, the sub-frame is moved to a predetermined position in consideration of the amount of movement.

According to a ninth aspect of the present invention, there is provided the scroll compressor assembling apparatus according to the third aspect, wherein the sub-frame positioning means comprises a first bearing of the frame and a second bearing of the sub-frame. When the allowable value for the inclination of the shaft center is different, the subframe is shifted from the frame center so that the inclination between the shaft center of the bearing part and the main shaft axis on the side with the smaller allowable value is smaller than the other. It is something to do.

According to a tenth aspect of the present invention, there is provided the scroll compressor assembling apparatus according to the third aspect.
The positioning setting of each positioning means is calibrated using a reference gauge having a surface simulating the horizontal reference surface and the outer diameter reference surface of the stator and the sub-frame of the motor and an outer diameter.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a structure of a scroll compressor according to Embodiment 1 of the present invention, FIG. 2 is a sectional view showing a structure of an assembling device of the scroll compressor in FIG. 1, and FIG. 3 is a frame of the assembling device in FIG. FIG. 4 is a perspective view showing a configuration of a positioning means, FIG. 4 is a perspective view showing a configuration of a stator positioning means of the electric motor of the assembling apparatus in FIG. 2, FIG. 5 is a perspective view showing a configuration of a subframe positioning means of the assembling apparatus in FIG. FIG. 6 is a sectional view showing a configuration of a frame measuring means of the assembling apparatus in FIG. 2,
7 is a cross-sectional view showing the configuration of the sub-frame measuring means of the assembling apparatus in FIG. 2, FIG. 8 is a cross-sectional view showing a state in which the frame, the stator of the electric motor and the sub-frame are assembled on a pallet as a frame positioning means, Is a schematic diagram for explaining a state in which the stator of the electric motor is deformed by fastening of the through bolt, FIG. 10 is a schematic diagram for explaining the effect of the deformation of the stator of the electric motor shown in FIG. 9 on the subframe, and FIG. FIG. 12 is a characteristic diagram showing an allowable range of misalignment and inclination required for the subframe from the relationship between misalignment and inclination of the subframe with respect to the frame, FIG. 12 is a schematic diagram showing the relationship between the subframe and the main axis, and FIG. FIG. 8 is a coordinate system diagram showing the relationship between the subframe, the frame in FIGS. That.

In the figure, reference numeral 21 denotes a cylindrical center shell having openings at both ends;
The upper and lower end shells, which are disposed so as to close the two openings 1 respectively, are provided.
Constitutes a closed shell 24. Reference numeral 25 denotes a first bearing 25 fixed to the inner surface of the side wall of the center shell 21 at the center.
8, the inner reference surface 25b formed coaxially with the first bearing portion 25a, and the horizontal reference surface 25c formed perpendicular to the axis of the first bearing portion 25a, as shown in FIG. Is provided. Reference numeral 26 denotes a fixed scroll having a spiral 26b formed on a base plate 26a fixed or supported directly or indirectly on the upper end surface of the frame 25. Reference numeral 27 denotes a fixed scroll supported on the base plate 27a so as to be swingable by the frame 25. The spiral 26b is an oscillating scroll in which the spiral direction is opposite and the spiral 27b forming the compression chamber 28 when combined with each other is formed.

Reference numeral 29 denotes a suction pipe disposed through the side wall of the center shell 21 and communicating between the inside and outside of the closed shell 24.
Although not shown, the discharge pipe penetrates through the upper end shell 22 and communicates the discharge side of the compression chamber 28 with the outside of the closed shell 24. 30 is a bearing 31 as a second bearing at the center.
And a sub-frame for supporting the trochoid pump 32. The sub-frame is formed at right angles to the axis of the bearing 31 and the inner diameter reference surface 30a and the outer diameter reference surface 30b formed coaxially with the bearing 31 as shown in FIG. A horizontal reference plane 30c is provided. Reference numeral 33 denotes an oil reservoir formed at a lower portion of the closed shell 24 and stores a lubricating oil 34. Both ends of the oil reservoir 35 are supported by the first bearing 25a and the bearing 31 of the frame 25, and the upper end is connected to the orbiting scroll 27. An oil hole 35a is formed through the center of the main shaft. Reference numeral 36 denotes an electric motor composed of a stator 36a having a core held between the frame 25 and the subframe 30, and a rotor 36b disposed at the center of the stator 36a via an air gap. The main shaft 35 penetrates and is integrated, and an outer diameter reference surface 36 formed coaxially with the inner diameter as shown in FIG.
c is provided. Reference numeral 37 denotes a through bolt which passes through the sub-frame 30 and the stator 36a and is screwed to the frame 25. These 21 to 37 constitute a scroll compressor.

Reference numeral 38 denotes a pallet as a frame positioning means, as shown in FIG. 3, a base plate 39, a cylindrical member 40 disposed at the center of the base plate 39 and carrying the frame 25 on the upper surface, Positioning holes (not shown) formed on the upper surface of the member 40 and formed in the frame 25
And a contact member 4 disposed on both sides of the cylindrical member 40 and contacting the side surface of the frame 25.
2, a positioning hole 43 formed in the base plate 39 and used for positioning in the apparatus main body, and a reference member 44 protruding from an edge of the base plate 39. After being drawn into the apparatus by the pallet pull-in means 45 shown in (1), the pallet is fixed by the pallet fixing means 46 through the positioning holes 43. 47 is a pallet 38
Frame measuring means for measuring the position and orientation of the frame 25 positioned above, which is incorporated in the casing 48 as shown in FIG.
It comprises a first sensor 49 for detecting the position 5b, a second sensor 50 for detecting the horizontal reference plane 25c of the frame 25, and a third sensor 51 for detecting the position of the casing 48.

Numeral 52 is a stator positioning means for the motor.
As shown in FIG. 4, an air cylinder 53 as a driving source, which is driven by the air cylinder 53 and moves in a radial direction of a stator 36 a of an electric motor 36 mounted on a pallet 38, causes an outer diameter reference surface of the stator 36 a to move. A pressing member 54 for pressing the pressing member 36c; and a stator moving mechanism 56 including a stopper 55 for restricting the amount of movement of the pressing member 54 by contacting the reference member 44 on the pallet 38 to set the stator 36a at a predetermined position. , Stator 36a
And an air cylinder 57 as a driving source having a driving force smaller than the driving force of the air cylinder 53, and a radius of the stator 36a driven by the air cylinder 57. By moving in the direction, a plurality of pairs of a stator pressing mechanism 59 including a pressing member 58 for pressing the stator 36a are arranged at predetermined intervals in the circumferential direction.

Reference numeral 60 denotes a sub-frame positioning means.
Linear actuator 6 as a driving source as shown in FIG.
1, and a pressing member 62 that is driven by the actuator 61 and moves in the radial direction of the sub-frame 30, thereby pressing the outer diameter reference surface 30b of the sub-frame 30.
The sub-frame moving mechanism 63 composed of
And an air cylinder 64 as a drive source having a driving force smaller than the driving force of the linear actuator 61, and a sub-frame 30 driven by the air cylinder 64. Moving in the radial direction of the sub-frame 3
A plurality of pairs of the sub-frame pressing mechanism 66 including a pressing member 65 for pressing 0 are arranged at predetermined intervals in the circumferential direction.

Reference numeral 67 denotes a sub-frame measuring means for detecting the position and posture of the sub-frame 30. The sub-frame measuring means 67 is incorporated in a casing 68 as shown in FIG. It comprises a sensor 69, a second sensor 70 for detecting the horizontal reference plane 30c of the sub-frame 30, and a third sensor 71 for detecting the position of the casing 68. Numeral 72 designates four through bolts 37 for connecting the subframe 30 and the stator 3 of the electric motor 36.
A bolt fastening means for simultaneously passing the sub-frame 30 and the stator 36 a to the frame 25 by simultaneously penetrating the frame 6 a and the frame 25. These 45 to 47, 52, 60, and 72 constitute a scroll compressor assembly device 73.

Next, a description will be given of a method of assembling the scroll compressor by the assembling device 73 of the scroll compressor configured as described above. Generally, when the fixed scroll 26 is incorporated, it is necessary to match the position and phase with the frame 25. Therefore, since the frame 25 is provided with a positioning hole (not shown) serving as a positioning reference, first, the frame 25 is palletized. 38, and the positioning holes are fitted to the positioning pins 41, whereby the frame 2
5 is accurately positioned on the pallet 38. In this state, as shown in FIG. 8, the motor stator 36a and the sub-frame 30 are stacked on the frame 25. Although not shown, the rotor 36b is installed. Lightly tighten at 37.

Next, after the pallet 38 is drawn into the inside of the apparatus by the pallet drawing means 45, the pallet 38 is accurately positioned and fixed to the apparatus through the positioning holes 43 provided in the pallet 38 by the pallet fixing means 46. Is done. In this state, the frame measuring means 47 shown in FIG. 6 moves to the measurement position, and first, the position of the casing 48 is detected by the third sensor 51, and the frame 2 is detected by the first and second sensors 49 and 50, respectively.
The position of the frame 25 is measured by detecting the inner diameter reference surface 25b and the horizontal reference surface 25c of No. 5. Next, the bolt 37 is loosened by the bolt fastening means 72 while maintaining the posture of each component, so that the stator 36a and the sub-frame 30 can move in the radial direction.

Next, the stator positioning means 52 of the electric motor shown in FIG. 4 starts operating. First, each air cylinder 53 of both stator moving mechanisms 56 is driven, and each pressing member 5 is moved.
4 moves in the radial direction of the stator 36a,
The outer diameter reference surface 36c of the stator 36a is pressed, and the stopper 55 comes into contact with the reference member 44 provided on the pallet 38 and stops. Next, each air cylinder 57 of both stator pressing mechanisms 59 is driven, and each pressing member 58 moves in the radial direction of the stator 36a and presses the outer peripheral surface of the stator 38a. To position the stator 36a. At this time,
Since the driving force of the air cylinder 53 on the stator moving mechanism 56 side is set larger than that of the air cylinder 57 on the stator pressing mechanism 59 side, the stator 36a is not pushed back to the stator moving mechanism 56 side, It is always positioned at the desired position. Although not shown, both pressing members 5
The movement amounts of the stators 4 and 58 are measured by measuring units provided in the stator moving mechanism 56 and the stator pressing mechanism 59, respectively, and based on the results, the outer diameter of the stator 36a and the position of the shaft center are detected.

Next, the operation of the sub-frame positioning means 60 shown in FIG. 5 starts. Sub-frame positioning means 6
0 is retracted upward during non-working, and when performing positioning work, it is lowered to a working position by a vertical drive mechanism (not shown) with a guide and brought into a state as shown in FIG.
The sub-frame 30 whose initial position is not fixed is roughly positioned by the linear actuator 61 and the air cylinder 64 so as not to interfere with the sub-frame 30, and then the sub-frame measuring means 67 shown in FIG. The position of the casing 68 is detected by the sensor 70, and the horizontal reference surface 30c and the inner diameter reference surface 30a of the sub-frame 30 are detected by the first and third sensors 69 and 71, respectively.
And the position of the sub-frame 30 is measured.

Then, from the position of the frame 25 measured by the frame measuring means 47 and the position of the sub-frame 30 measured by the sub-frame measuring means 67, the amount of misalignment between the two is calculated. Frame moving mechanism 6
3 is driven, and each pressing member 62 is moved in the radial direction of the sub-frame 30 by the sub-frame 3.
It moves and stops while pressing the 0 outer diameter reference surface 30b. At this time, since each pressing member 65 presses the outer peripheral surface of the sub frame 30 from the radial direction of the sub frame 30 by each air cylinder 64 of the sub frame pressing mechanism 66, the sub frame 30 Following and positioned at a desired position. At this time,
Linear actuator 6 on sub-frame moving mechanism 63 side
1 can be realized because the driving force is set to be larger than that of the air cylinder 64 on the sub-frame pressing mechanism 66 side. When the linear actuator 61 moves forward, the air cylinder 64 is pushed back, and the linear actuator 61 is pushed.
Is retracted, the air cylinder 64 presses the sub-frame 30 against the pressing member 62.

Here, the significance of how important it is to position the sub-frame 30 with respect to the frame 25 will be described with reference to FIGS. First, the relationship between the attitude of the bearing and the efficiency of the scroll compressor will be described. Generally, the form of the radial bearing used for the scroll compressor is a plain bearing, a rolling bearing, and a pivot bearing. It is a well-known fact that, for long life and smooth rotation of the rotating shaft, the angle between the bearing and the rotating shaft must be less than the allowable amount, and the fact that the rotating shaft rotates smoothly is mechanical. Needless to say, the loss can be reduced, and the efficiency of the scroll compressor can be improved. Further, the allowable amount varies depending on the type of the bearing, and the pivot bearing is the largest, and the rolling bearing and the sliding bearing are smaller in this order.

In the two-end support structure such as the scroll compressor according to the first embodiment, the angle between the main shaft 35 of the two bearings, ie, the first bearing 25a and the bearing 31 (second bearing). Must be equal to or smaller than the respective allowable inclination amounts. FIG. 11 shows the permissible amounts of the misalignment and the inclination required of the bearing 31 by taking the misalignment and the inclination of the bearing 31 with respect to the first bearing portion 25a on the horizontal axis and the vertical axis, respectively. Now, a case where the allowable inclination amount of the bearing 31 is smaller than that of the first bearing portion 25a, as in the case where the first bearing portion 25a is a pivot bearing and the bearing 31 is a rolling bearing, will be described with reference to FIG. The relationship between the bearing 31 and the main shaft 35 will be described.

In FIG. 12, (A) shows a state in which both the misalignment and the inclination are 0 (indicated by a point a in FIG. 11). From this state, only the inclination of the bearing 31 is increased with the misalignment of 0. (Indicated by point b in FIG. 11) is shown in FIG.
A state in which the misalignment has increased (indicated by a point c in FIG. 11) is shown in FIG. These FIGS. 12 (A), (B),
As can be seen from (C), when the misalignment increases, the angle between the main shaft 35 and the bearing 31 increases. However, in the scroll compressor according to the first embodiment, the inclination between the first bearing portion 25a and the bearing 31 is different from that of the frame 25,
In general, it is difficult to reduce the value to 0 because it is determined by accumulating the accuracy of the components of the stator 36a of the electric motor 36 and the subframe 30. Therefore, in order to satisfy the allowable inclination amount of the bearing 31, it is necessary to minimize the misalignment.

Here, the positioning of the sub-frame with respect to the frame 25 will be described in detail. The first shown in FIG.
And the second sensor 49, 50 is the position of the frame 25,
The posture is determined by the first and second sensors 69 and 70 shown in FIG.
Measures the position and orientation of the sub-frame 30, and measures the positions of the casings 48 and 68 at the time of measurement by the third sensors 51 and 71 shown in FIGS. 6 and 7, respectively.
Now, the coordinates of the apparatus main body are 0-x, y, z, and the coordinates in the casing of the frame measuring means 47 are 0fh-xfh, yfh,
Assuming that zfh and the coordinates in the casing of the subframe measuring means 67 are 0sfh-xsfh, ysfh, and zsfh,
These relationships are as shown in FIG.

Further, the first and second sensors 49, 50
25 / first bearing 25a measured by
Is Off and the inclination is θf, the frame coordinate system O
f-xf, yf, zf are obtained. If the position of the subframe 30 and the bearing 31 measured by the first and second sensors 69 and 70 is Osf and the inclination is θsf, the subframe coordinate system is Osf-xsf, ysf, zs.
f is required. At this time, the relative inclination between the frame 25 and the sub-frame is θsf−θf,
Must be less than or equal to Δ as shown in FIG. Therefore, in order to align the axis with the frame 25 and the first bearing 25a, the positioning target position of the subframe 30 and the bearing 31 is the point P on the zf axis of the frame coordinate system. That is, the vector ε ₀ = the vector Osf · P is used as the initial misalignment amount, and the sub-frame 30 is moved by the sub-frame positioning means 60 so that the | vector ε | approaches 0, and finally ε _O <ξ. As the sub-frame 30
Position.

After positioning the stator 36a of the electric motor 36 and the sub-frame 30 with respect to the frame 25 in this manner, the sub-frame 30 is pressed down again,
The bolt 37 is fastened by the bolt fastening means 72 to complete the assembly. Each measuring means 4 for the assembled product
Based on the data measured at 7 and 67, the coaxiality of the frame 25 and the sub-frame 30 and the stator 36a of the electric motor 36
After calculating the air gap amount between the motor and the rotor 36b and determining the finishing accuracy as a product, the finished product data is stored by storage means (not shown). Thereafter, the measuring means 47, 67, the positioning means 52, 60, etc. are returned to the predetermined original positions, the pallet 38 fixed by the pallet fixing means 46 is released, and is carried out of the apparatus by the pallet retraction means 45. Thus, a series of assembling operations are completed.

Here, the influence of the deformation of the stator 36a of the electric motor 36 when the through bolt 37 is fastened will be described. Generally, the stator 36a is shown in FIG.
9 is formed by stacking sheet metals as shown in FIG.
As shown in (B), it is greatly deformed so as to contract in the axial direction. The contraction in the axial direction is such that the portion of the through bolt 37 on which the axial force acts is locally contracted. As a result, as shown schematically in FIG. It deforms into a wavy shape in which the vicinity of the surface is depressed. FIGS. 10B and 10C are schematic views showing the sub-frame 30 expanded in the circumferential direction, and FIG.
FIG. 10C shows a deformation mode in a case where the number of foot members 30d is three, which is smaller than that of the through bolts 37, for comparison.

The through bolt 37 and the foot member 30d
Are arranged at equal intervals, the axial force 74 due to the fastening of the through bolt 37 is generated in the vicinity of the bolt seating surface, so that the deformation near the bolt seating surface is concave and the space between the through bolts 37 is convex. become. When the number of the foot members 30d is three, the phase of the deformation mode does not match the phase of the arrangement of the foot members 30d, and a moment 75 as shown in FIG. 10C is generated. Deformation occurs. This deformation not only deteriorates the flatness of the horizontal reference plane 30c, but also causes extra stress on the bearing 31 and shortens the life of the bearing. On the other hand, the foot member 3
If 0d is the same number as four through bolts 37, FIG.
As shown in FIG. 10B, the moment received by each foot member 30d is substantially zero, and the upper surface does not deform as shown in FIG.

As described above, according to the first embodiment, since the outer diameter reference surface 36c formed coaxially with the inner diameter is provided on the outer peripheral surface of the core of the stator 36a, the outer diameter reference surface 36c is formed between the stator 36a and the rotor 36b. A pallet 38 as a frame positioning means for positioning and holding the frame 25 and a stator 36a on the positioned frame 25 are formed on the outer peripheral surface of the core coaxially with the inner diameter. By pressing the outer diameter reference surface 36c positioned in the radial direction, the stator positioning means 52 for positioning with respect to the frame 25 and the sub-frame 30 on the positioned stator 36a are moved outside the bearing 31 set on the basis of the bearing 31. Sub-frame positioning for positioning with respect to the frame 25 by pressing the diameter reference surface 30b from the radial direction Since a stage 60, the frame 2
5. The stator 36a and the sub-frame 30 can be accurately positioned and the air gap can be easily adjusted. Furthermore, the reference member 4 provided on the pallet 38
4, since the positioning can be performed at the position where the stopper 55 of the stator positioning means 52 abuts and stops, the accumulation of positioning errors can be minimized, and the positioning can be set at a low cost with a simple structure. become.

Embodiment 2 In the first embodiment, it has been described that the sub-frame 30 is moved by the sub-frame positioning means 60 so that the vector Osf · P approaches 0, and positioning is performed. Due to the deformation of the stator 36a, the sub-frame 30 tilts and its posture changes, and as shown in FIG. 14, there is a possibility that the sub-frame 30 shifts from the position P to the position P '. Therefore, in the second embodiment, the position shift is corrected to improve the positioning accuracy.

The deformation of the stator 36a generally has large variations among components, but the reproducibility is good when focusing on one component. Utilizing this, the following correction step is added to the subframe positioning step. That is, while the positions of the frame 25 and the sub-frame 30 are measured by the frame measuring means 47 and the sub-frame measuring means 67, the through bolts 37 are fastened once and the movement amount of the sub-frame 30 is measured. At this time, subframe 3
0 moves from the Osf position to the Osf 'position. When the sub-frame 30 is aligned, only the sub-frame 30 moves, and the positions of the stator 36a and the through bolts 37 do not change. Bolt 37
The action point of the axial force hardly changes, and the influence of the change in the axial direction hardly changes. Therefore, the vector Osf · Osf ′ obtained by the movement of the sub-frame 30 is obtained.
Is considered equivalent to the vector PP · P ′, and the positioning target of the sub-frame 30 is set to the position P ″ obtained by subtracting the vector PP · P ′ from the position of P. The sub-frame 30 moves to the position P and is positioned at a regular position.

As described above, according to the second embodiment, when the through bolt 37 is fastened, the amount of movement of the sub-frame caused by the deformation of the stator 36a is measured in advance, and the sub-frame is moved to a position taking this amount of movement into account. Since the movement of the stator 30 is performed, the positioning can be performed with higher accuracy without being affected by the deformation of the stator 36a.

Embodiment 3 FIG. 15 is a schematic diagram showing the relationship between the first bearing portion and the bearing and the main shaft in the third embodiment, and FIG. 16 is a diagram for explaining a bearing positioning target position in consideration of the attitude of the bearing in FIG. Now, FIG.
Assuming that the inclination of the bearing 31 with respect to the first bearing portion 25a is α as shown in FIG. 5A, the first and second embodiments are assembled as shown in FIG. The angle between the bearing portion 25a and the main shaft 35 is 0,
The angle between the bearing 331 and the main shaft 35 is α. However, for example, when the first bearing portion 25a is a pivot bearing and the bearing 31 is a rolling bearing, the angle between the bearing 31 having a small inclination allowance and the main shaft 35 is reduced, and FIG.
It is desirable to make the state as shown in FIG. If this is expressed in the apparatus coordinate system, the only difference is that the positioning target position of the bearing 31 is changed from P to q as shown in FIG. Therefore, in the third embodiment, the first
When the allowable value for the inclination of the main shaft 35 is different between the bearing portion 25a of the sub-frame 30 and the bearing 31 of the sub-frame 30, the sub-axis is set so that the inclination between the axis of the smaller allowable value and the axis of the main shaft 35 is smaller than the other. The frame 30 is positioned off the axis of the frame 25.

As described above, according to the third embodiment, the inclination with respect to the axis of the main shaft 35 can be made smaller with respect to the bearing having the smaller inclination allowance. In addition to reducing the mechanical loss, the life of the bearing can be prolonged. The first bearing 25
a, if the bearing 31 are both sliding bearings, each tilt allowance [psi _1, by internally dividing the slope alpha of the bearing 31 by [psi ₂ with respect to the first bearing portion _{25a, β = α × ψ 1} / (ψ 1 +
ψ ₂ ) and γ = α × ψ ₂ / (ψ ₁ + ψ ₂ )
Positioning may be performed as shown in (D), and the position of q ′ shown in FIG.

Embodiment 4 FIG. 17 is a perspective view showing a configuration of a reference gauge applied to a scroll compressor assembling apparatus according to the fourth embodiment. In the figure, reference numeral 76 denotes a reference gauge configured as shown in the figure,
In the upper stage corresponding to the above, the inner diameter reference surface 3 of the sub-frame 30
0a and a simulated inner diameter reference surface 76c simulating the horizontal reference surface 30c, respectively, and a middle stage corresponding to the stator 36a simulates an outer diameter reference surface 36c of the stator 36a. A simulated outer diameter reference surface 76c having a slightly larger diameter is further provided in the frame 2
5 is a horizontal reference surface 25c of the frame 25
A simulated horizontal reference surface 76d and a simulated inner diameter reference surface 76e for simulating the inner diameter reference surface 25b are formed, respectively. Although not shown, the reference gauge 76 is used by being placed on the pallet 38. A positioning hole to be fitted to 41 is also formed at a predetermined position.

Next, the calibration of the measurement system of the apparatus using the reference gauge 76 configured as described above will be described. First, when the reference gauge 76 is placed on the pallet 38 and loaded into the assembling apparatus 73, the calibration mode is entered upon detecting that the reference gauge 76 has been loaded by a reference gauge / work discrimination sensor (not shown). Then, the frame measuring means 4
7 rises, the subframe measuring means 67 descends, and the stator moving mechanism 56 and the stator pressing mechanism 59 of the stator positioning means 52 of the electric motor move forward, so that the respective sensors become the simulated reference surfaces 76a to 76e of the reference gauge 76. Directly or indirectly, and each sensor outputs a measured value.

At this time, since the simulated outer diameter reference surface 76c has a slightly larger diameter than the outer diameter reference surface 36c of the stator 36a, the reference member 44 on the pallet 38 when the stator moving mechanism 56 advances. And the air cylinder 53 of the stator moving mechanism 56,
Since each output of the air cylinder 57 of the stator pressing mechanism 59 is set uniformly by switching the air pressure, no trouble occurs. Then, the measurement values output from the sensors as described above are compared with the data such as the coaxiality and the height of the reference gauge 76 which have already been input, and the measurement system is calibrated. Alternatively, for example, the ambient temperature may be monitored by a temperature measuring element (not shown), and if a certain temperature change occurs, an alarm or the like may be issued to perform a new calibration.

As described above, according to the fourth embodiment, the horizontal reference surface 25c and the inner diameter reference surface 25b of the frame 25 are provided.
The simulated horizontal reference surface 76d and the simulated inner diameter reference surface 76e that respectively simulate the outer diameter reference surface 3
A simulated outer diameter reference surface 76c simulating the inner reference surface 30a and the horizontal reference surface 3
0c and a reference gauge 7 on which a simulated inner diameter reference surface 76a and a simulated horizontal reference surface 76b are respectively formed.
Since the calibration of the measurement system of the apparatus is performed by using the method 6, highly reliable positioning can be performed.

[0049]

As described above, according to the first aspect of the present invention, a gradual compression is performed in a compression chamber formed by combining a sealed shell and a swirling refrigerant gas stored and sucked in the sealed shell. A fixed scroll and an orbiting scroll, which are fixed to the inner wall surface of the hermetic shell, support the fixed scroll and the orbiting scroll, and have a first bearing portion at the center, and a predetermined distance from the frame. A motor having a sub-frame having a second bearing coaxially arranged with the first bearing, a stator having a core sandwiched between the frame and the sub-frame, and a rotor disposed at the center of the stator. , And both ends are respectively supported by first and second bearing portions and one end is connected to the orbiting scroll. An outer diameter reference surface formed coaxially with an inner diameter on an outer peripheral surface of a stator core in a scroll compressor including a shaft, a subframe and a through bolt that penetrates a core of a stator of an electric motor and fastens the same to the frame. Is provided, it is possible to provide a scroll compressor capable of easily adjusting the air gap.

According to the second aspect of the present invention, the step of positioning the frame with reference to the first bearing portion, and the step of positioning the stator of the electric motor on the outer peripheral surface of the core with respect to the positioned frame, coaxially with the inner diameter. A step of positioning via the formed outer diameter reference surface, and a step of positioning the sub-frame with respect to the positioned frame with reference to the second bearing portion;
And a step of fastening the positioned stator and subframe of the motor to the frame via bolts, so that a method of assembling a scroll compressor capable of accurately positioning the frame, the stator of the motor and the subframe is provided. Can be provided.

According to the third aspect of the present invention, the frame positioning means for positioning and holding the frame on which the stator and the subframes of the motor are stacked, and the stator of the motor on the positioned frame are provided. The stator positioning means of the electric motor for positioning the outer diameter reference surface formed coaxially with the inner diameter on the outer peripheral surface of the core with respect to the frame by pressing it radially, Sub-frame positioning means for positioning the outer diameter reference surface set on the basis of the bearing portion 2 as a reference from the radial direction with respect to the frame, and the stator of the electric motor and the sub-frame are fastened to the frame via bolts. With the bolt fastening means, the frame, the stator of the electric motor and the sub-frame It is possible to provide an assembly device for every well can be positioned scroll compressor.

According to a fourth aspect of the present invention, in the third aspect, the frame positioning means includes a positioning seat for supporting a horizontal reference surface formed on the frame, and a frame formed so as to protrude from the positioning seat. The use of a pallet with a positioning pin that fits into the set positioning reference hole and cooperates with the positioning seat to position the frame, thus assembling a scroll compressor that can accurately position the frame with a simple structure. An apparatus can be provided.

According to a fifth aspect of the present invention, in the third aspect, the stator positioning means of the electric motor is disposed at a predetermined interval in the circumferential direction and is moved in the radial direction to move the stator positioning means of the electric motor. A plurality of stator moving mechanisms for moving the outer surface of the motor to a predetermined position on the frame by pressing an outer diameter reference surface formed coaxially with the inner diameter with a positioning member; And a plurality of stator pressing mechanisms that are disposed corresponding to the respective sides and move in the radial direction to press the stator of the electric motor against the positioning member with a pressing force smaller than the pressing force of the positioning member of the stator moving mechanism. It is possible to provide a scroll compressor assembling apparatus that accurately positions a stator of an electric motor and easily adjusts an air gap.

According to a sixth aspect of the present invention, in the fifth aspect, the predetermined position on the frame is such that the stator moving mechanism abuts a reference member provided on a pallet on which the frame is positioned. Therefore, it is possible to provide a scroll compressor assembling apparatus capable of accurately positioning the stator with a simple structure.

According to a seventh aspect of the present invention, in the third aspect, the sub-frame positioning means is disposed at a predetermined interval in the circumferential direction and is moved in the radial direction to move the sub-frame to its outer peripheral surface. A plurality of sub-frame moving mechanisms for moving an outer diameter reference surface formed coaxially with the second bearing portion with a positioning member to a predetermined position of a stator of the electric motor, and each sub-frame moving mechanism of the sub-frame And a plurality of sub-frame pressing mechanisms that are disposed corresponding to the opposite sides and move in the radial direction to press the sub-frame against the positioning member with a pressing force smaller than the pressing force of the positioning member of the sub-frame moving mechanism. Therefore, it is possible to provide a scroll compressor assembling apparatus capable of accurately positioning the sub-frame.

According to an eighth aspect of the present invention, in the third or seventh aspect, the sub-frame positioning means predicts the amount of movement of the sub-frame generated when the through bolt is fastened and takes into account the amount of movement. Since the sub-frame is moved to the predetermined position, it is possible to provide a scroll compressor assembling apparatus capable of positioning the sub-frame with higher accuracy.

According to a ninth aspect of the present invention, in the third aspect, the sub-frame positioning means allows the first bearing portion of the frame and the second bearing portion of the sub-frame to allow for the inclination of the axis. When the values are different, the sub-frame is shifted from the axis of the frame so that the inclination between the axis of the bearing portion and the axis of the main shaft on the side of the smaller tolerance is smaller than the other, so that the sub-frame is positioned. It is possible to provide a scroll compressor assembling apparatus capable of obtaining a scroll compressor with small mechanical loss.

According to a tenth aspect of the present invention, in the third aspect, the reference gauge having a surface simulating the horizontal reference surface and the outer diameter reference surface of the frame, the stator of the motor and the sub-frame, and the outer diameter is provided. Since the positioning setting of each positioning means is calibrated by using the same, it is possible to provide a scroll compressor assembling apparatus capable of easily calibrating the measurement system.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a scroll compressor according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of an assembly device of the scroll compressor in FIG.

FIG. 3 is a perspective view showing a configuration of a frame positioning means of the assembling apparatus in FIG. 2;

FIG. 4 is a perspective view showing a configuration of a stator positioning means of the electric motor of the assembling apparatus in FIG. 2;

FIG. 5 is a perspective view showing a configuration of a sub-frame positioning unit of the assembling apparatus in FIG. 2;

FIG. 6 is a sectional view showing a configuration of a frame measuring means of the assembling apparatus in FIG. 2;

FIG. 7 is a sectional view showing a configuration of a sub-frame measuring means of the assembling apparatus in FIG. 2;

FIG. 8 is a cross-sectional view showing a state in which the frame, the stator of the electric motor, and the subframe are assembled on a pallet as frame positioning means.

FIG. 9 is a schematic diagram for explaining a state in which the stator of the electric motor is deformed by fastening the through bolt.

FIG. 10 is a schematic diagram for explaining an effect of a deformation of a stator of the electric motor shown in FIG. 9 on a subframe.

FIG. 11 is a characteristic diagram showing an allowable range of misalignment and inclination required for a subframe based on a relationship between misalignment and inclination of a subframe with respect to a frame.

FIG. 12 is a schematic diagram showing a relationship between a subframe and a main shaft.

FIG. 13 is a coordinate system diagram showing a relationship between a frame and a sub-frame, each measurement unit in FIGS. 6 and 7, and an apparatus main body.

FIG. 14 is a diagram for explaining correction of a positional shift of a sub-frame due to fastening with through bolts according to the second embodiment.

FIG. 15 is a schematic diagram showing a first bearing portion and a relationship between a bearing and a main shaft in a third embodiment.

16 is a diagram for explaining a bearing positioning target position in consideration of the bearing posture in FIG.

FIG. 17 is a perspective view showing a configuration of a reference gauge applied to an assembling apparatus of a scroll compressor according to a fourth embodiment.

FIG. 18 is a cross-sectional view illustrating a configuration of a conventional scroll compressor.

FIG. 19 is a cross-sectional view illustrating a configuration of a conventional scroll compressor different from that of FIG. 18;

[Explanation of symbols]

24 closed shell, 25 frame, 25a first bearing, 25b, 30a inner diameter reference surface, 25c, 30c
Horizontal reference plane, 26 fixed scroll, 27 swing scroll, 30 sub-frame, 30b, 30c outer diameter reference plane, 31 bearing (second bearing part), 35 main shaft, 36
Motor, 36a stator, 36b rotor, 37 through bolt, 38 pallet, 44 reference member, 47 frame measuring means, 52 stator positioning means, 60
Subframe positioning means, 67 Subframe measuring means.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiaki Iwasaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3H029 AA02 AA14 AA21 AB03 BB31 BB32 BB33 CC02 CC07 CC08 CC09 CC10 3H039 AA03 AA04 AA12 BB07 BB08 CC01 CC11 CC32 CC33 CC34

Claims (10)

[Claims] A sealed scroll, a fixed scroll and an orbiting scroll for gradually compressing and discharging a refrigerant gas contained in the sealed shell and drawn in a compression chamber formed by combining swirls; and the closed shell. A frame fixed to an inner wall surface of the frame and supporting the fixed scroll and the orbiting scroll and having a first bearing portion at a center portion; and a frame disposed at a predetermined distance from the frame and coaxial with the first bearing portion. A sub-frame having a second bearing portion thereon, a motor having a stator having a core held between the frame and the sub-frame, and a rotor disposed at the center of the stator; and a motor integrated with the rotor of the motor. A main shaft supported at both ends by the first and second bearing portions and having one end connected to the orbiting scroll; In a scroll compressor having a sub-frame and a through bolt for penetrating a stator core of an electric motor and fastening the same to the frame, an outer diameter reference surface formed coaxially with an inner diameter on an outer peripheral surface of the stator core is provided. A scroll compressor characterized by being provided. 2. A step of positioning a frame with reference to a first bearing portion, and a step of positioning a stator of an electric motor with respect to the positioned frame via an outer diameter reference surface formed coaxially with an inner diameter on an outer peripheral surface of a core. Positioning the sub-frame with respect to the positioned frame with reference to the second bearing portion; and fastening the positioned stator and sub-frame of the electric motor to the frame via bolts. A method for assembling a scroll compressor. 3. A frame positioning means for positioning and holding a frame on which a stator and subframes of an electric motor are stacked, and an inner diameter of an outer peripheral surface of a core of the stator of the electric motor on the positioned frame. A stator positioning means of the motor for positioning the frame relative to the frame by pressing an outer diameter reference surface formed coaxially from the radial direction, and a sub-frame on the positioned stator of the motor based on the second bearing portion. Sub-frame positioning means for positioning the outer diameter reference surface relative to the frame by pressing the outer diameter reference surface in a radial direction, and bolt fastening means for fastening the stator of the electric motor and the sub-frame to the frame via bolts; An assembly device for a scroll compressor, comprising: 4. A frame positioning means, comprising: a positioning seat formed on a frame for supporting a horizontal reference surface; and a positioning reference hole protruding from the positioning seat and fitted in a positioning reference hole formed on the frame, the frame being provided with the positioning seat. 4. The scroll compressor assembling apparatus according to claim 3, wherein the pallet includes a positioning pin that cooperates to position the frame. 5. The stator positioning means of the electric motor is disposed at a predetermined interval in the circumferential direction and is moved in the radial direction so that the stator core of the electric motor is formed on its outer peripheral surface coaxially with the inner diameter. A plurality of stator moving mechanisms for moving the surface to a predetermined position on the frame by pressing the surface with a positioning member, and the stator of the electric motor is disposed corresponding to each side opposite to each of the stator moving mechanisms and radially arranged. 4. A plurality of stator pressing mechanisms for moving and pressing a stator of the electric motor against the positioning member with a pressing force smaller than a pressing force of a positioning member of the stator moving mechanism. Assembly equipment for scroll compressors. 6. The frame according to claim 5, wherein the predetermined position on the frame is set by bringing a stator moving mechanism into contact with a reference member provided on a pallet on which the frame is positioned. Assembly equipment for scroll compressors. 7. The sub-frame positioning means is disposed at a predetermined interval in the circumferential direction and is moved in the radial direction to move the sub-frame to the outer diameter reference surface formed coaxially with the second bearing portion. A plurality of sub-frame moving mechanisms for moving the motor to a predetermined position on the stator of the electric motor by pressing the surface with a positioning member; and a plurality of radii disposed corresponding to the opposite sides of the sub-frame moving mechanisms of the sub-frame. A plurality of sub-frame pressing mechanisms for moving the sub-frame in a direction and pressing the sub-frame against the positioning member with a pressing force smaller than a pressing force of a positioning member of the sub-frame moving mechanism. 3. The scroll compressor assembling apparatus according to 3. 8. The sub-frame positioning means predicts an amount of movement of the sub-frame generated when the through bolt is fastened and moves the sub-frame to a predetermined position in consideration of the amount of movement. The scroll compressor assembling device according to claim 3 or 7, wherein: 9. When the allowable value for the inclination of the axis is different between the first bearing portion of the frame and the second bearing portion of the sub-frame, the sub-frame positioning means is provided for the bearing portion having the smaller allowable value. 4. The scroll compressor assembling apparatus according to claim 3, wherein the sub-frame is positioned so as to be shifted from the axis of the frame so that the inclination of the axis and the axis of the main shaft is smaller than the other. 10. The positioning setting of each positioning means is calibrated by using a reference gauge having an outer diameter and a surface simulating each horizontal reference surface and an outer diameter reference surface of a frame, a stator of a motor, and a subframe. 4. The scroll compressor assembling apparatus according to claim 3, wherein: