JPH11210657A - Compressor assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate correct positioning of a stator, a flame, and a rotary shaft by eliminating an influence exerted on coaxial positioning of an annular passage of the stator and flame main bearing part in a machining accuracy of a casing for fixing the stator. SOLUTION: A reference guide bar 18 is positioned on an axial core of collect chucks 19, 22. When a collet chucks B21 and a collect chuck D24 are moved in an arrow direction, a collect chuck A21 and a collet chuck C23 are moved in a direction apart from an axial core of the reference guide bar 18, and the collet chuck B21 and a collet chuck D24 are moved to a direction approaching to the axial core of the reference guide bar 18. The reference guide bar 18,a stator annular passage 25, a flame main bearing 26 are constrained, and positioning is carried out. An end surface of a casing 2 is supported by a floating mechanism part 17 provided on an assembly pallet 21. It is thus possible or prevent reduction of positioning accuracy of the stator 11 and the flame 8 caused by machining accuracy of the casing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary machine such as a compressor and, more particularly, to a scroll compressor for an air conditioning and refrigeration system.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor has a motor portion formed of an annular stator fixed in a cylindrical casing, a cylindrical rotor inserted in an annular passage of the stator, and a fixed scroll. A compression mechanism formed of a frame having a rotating shaft concentrically fitted with the orbiting scroll, the Oldham ring, the rotor, and a main bearing located at the upper part of the rotor and rotatably fixing the rotating shaft, and the lower part of the rotor And an auxiliary bearing for rotatably fixing the rotating shaft.

[0003]

In order to obtain the highest operating efficiency of the scroll compressor, the distance between the passage walls of the stator and the rotor should be as uniform as possible. In addition, if the interval is not uniform, a magnetic attraction force is generated in the motor section during operation, and the bearing load increases, which may shorten the life of the main bearing and the sub bearing. Therefore, the rotor must be held so that this spacing is uniform. Also, the inclination between the axis of the rotating shaft and the axis of each of the main bearing and the sub-bearing greatly affects the reliability of the bearing portion. If the inclination exceeds an allowable value, the life of the main bearing and the sub-bearing is reduced. That is, the axis of the stator and the axis of the main bearing and the axis of the sub-bearing must be accurately matched.

[0004]

In order to solve the above-mentioned problems, the present invention uses a plurality of collet chucks based on a round bar-shaped reference guide bar penetrating through an annular passage of a stator and a main bearing of a frame. The coaxial positioning of the annular passage of the stator and the main bearing portion of the frame is performed, and at the same time, an annular portion having a quadrant or semicircular cross section (hereinafter referred to as a floating mechanism portion) and a circumference of the floating mechanism section cross section Using an assembly pallet provided with a quadrant or semicircular part that fits with the floating mechanism so that it can move smoothly in the direction, the machining accuracy of the casing to which the stator is fixed is equal to the annular passage of the stator. It is characterized by eliminating the effect on the coaxial positioning of the main bearing of the frame.

[0005]

Embodiments of the present invention will be described below.

FIG. 1 shows an embodiment of a scroll compressor according to the present invention. The overall structure of the scroll compressor has a structure in which a compression mechanism section 3, a motor section 10, and an auxiliary bearing are built in a closed casing 1.

The compression mechanism 3 has a fixed scroll 4 with a spiral wrap standing on a head plate, and a orbiting scroll 5 with a spiral wrap standing on a head plate to mesh with the fixed scroll 4.
Ring 6 for preventing rotation of the orbiting scroll 5
The fixed scroll 4 is fixed to the frame 8, the orbiting scroll 5 is fitted concentrically with the rotating shaft 9, and the Oldham ring 6 is supported by the frame 8.

The upper part of the rotating shaft 9 is rotatably fixed by a main bearing 7 fitted to a frame 8, the rotor 12 is fixed to the middle part by concentric outer fitting, and the lower part is a sub bearing. 13 are rotatably fixed. The sub bearing 13 is fitted and fixed to the casing 2.

In assembling the compressor, first, the stator 11 is fitted and fixed to the casing 2 by shrink fitting or the like. Next, as shown in FIG. 2, the reference guide bar 18 for securing the axis of the frame collet chuck 19 and the stator collet chuck 22 is inserted into the stator annular passage 25 and the frame main bearing portion 26, and the stator Collet chuck 22 and collet chuck 19 for frame
, The coaxial positioning of the stator annular passage 25 and the frame main bearing 26 is performed.

A reference guide bar 18 is located on the axis of the collet chucks 19 and 22. When the collet chuck B21 and the collet chuck D24 move in the direction of the arrow, the collet chucks A21 and C23 are tapered by the taper. The collet chuck B21 and the collet chuck D24 move in a direction approaching the axis of the reference guide bar 18, in a direction away from the axis of the reference guide bar 18, and restrain and position the reference guide bar 18, the stator annular passage 25, and the frame main bearing 26. I do.

Since the stator 11 is fixed to the casing 2, the end face of the casing 2 is
, The positioning accuracy of the stator 11 and the frame 8 due to the processing accuracy of the casing 2 can be prevented from lowering.

The floating mechanism 17 is an annular body having a quadrant cross section. The assembling pallet 16 has a quadrant that fits into the floating mechanism 17. The floating mechanism 17 can move smoothly in the circumferential direction of its cross section, and even if the casing 2 is deformed, the stator 1
1 and the frame 8 can be accurately positioned. After the positioning, the frame 8 is fixed by a method such as welding.

After assembling the compression mechanism 3 and fixing the rotor 12 by shrink fitting or the like, the auxiliary bearing 13 is fixed to the casing 2, and the upper cap 14 and the lower cap 15
Is closed and completed.

[0014]

According to the present invention, accurate positioning of the stator 11, the frame 8, and the rotating shaft 9 can be easily performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a scroll compressor according to the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of positioning of a stator and a frame.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Casing, 3 ... Compression mechanism part, 4 ...
Fixed scroll, 5 orbiting scroll, 6 ... Oldham ring, 7 ... main bearing, 8 ... frame, 9 ... rotating shaft, 10 ...
Motor part, 11 stator, 12 rotor, 13 auxiliary bearing, 14 upper cap, 15 lower cap, 16 assembly pallet, 17 floating mechanism part, 18 reference guide bar, 19 collet chuck for frame, 20 ...
Collet chuck A, 21 ... Collet chuck B, 22
... Collet chuck for stator, 23 ... Collet chuck C, 24 ... Collet chuck D, 25 ... Circuit annular passage, 26 ... Frame main bearing.

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kazuya Ishigami 4-6-1 Kanda Surugadai, Chiyoda-ku, Tokyo Inside Hitachi, Ltd. (72) Inventor Kazuo Sakurai 390 Muramatsu, Shimizu-shi, Shizuoka Pref. Within the business division

Claims (1)

[Claims] 1. A motor section comprising a stator fixed in a cylindrical casing, a rotor inserted into an annular passage of the stator, and a rotating shaft of the rotor rotatable on both sides of the rotor. A method of assembling a compressor having a main bearing and a sub-bearing supported on a plurality of collet chucks, the method comprising: A method of assembling a compressor, comprising positioning a stator and the main bearing portion using a reference guide bar for securing a core.