JP2002048082A - Method of assembling two-cylinder rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the conventional problem lowering the working efficiency due to the overlap of assembling work process in the conventional method of assembling a two-cylinder rotary compressor that parts around a cylinder are temporarily assembled for centering and the assembly is disassembled and reassembled after measuring the positional relational dimension between assembling parts, practically, a problem that the dimension can not be reproduced for centering when assembling a crank shaft and a roller, and to solve the problem that an accurate part working process is necessary in order to provide a reference of the positional relation to the parts. SOLUTION: The relational dimension between the inner wall surface of a second cylinder and the outer peripheral surface of an auxiliary shaft part of a crank shaft is measured, and while centering of the second cylinder inner wall surface is performed with an optimal clearance in relation to the previously measured maximum outer circle dimension between the peripheral surface of the auxiliary shaft part of the crank shaft in the condition that a roller is fitted in a lower eccentric part of the crank shaft. Thereafter, the roller is arranged, and finally, the auxiliary bearing is fastened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a two-cylinder rotary compressor having a crankshaft having two eccentric portions and two cylinders.

[0002]

2. Description of the Related Art A two-cylinder rotary compressor has a structure of an electric motor unit in an upper part in a closed container and a compression mechanism part in a lower part.
The compression mechanism portion includes a crankshaft having two eccentric portions directly connected to the electric motor portion, and a main bearing, a first cylinder, a partition plate, a second cylinder, and an auxiliary bearing from the electric motor side. When the crankshaft supported by the auxiliary bearing rotates, the rollers in each cylinder rotate eccentrically to perform a compression operation.

[0003] Conventional methods for assembling compression mechanism parts include:
As shown in Japanese Patent Publication No. 5-2837, first, rollers are fitted into the upper eccentric portion and the lower eccentric portion of the crankshaft, respectively, and the respective eccentricities are respectively fitted to the outer peripheral surfaces of the main shaft portion and the sub shaft portion. The maximum outer circle dimension of the roller fitted into the part is measured for both the upper eccentric part and the lower eccentric part. Next, the main bearing and the first cylinder are aligned and fastened with fixing bolts based on the measured maximum outer circle dimension data of the roller. After that, the partitioning plate and the second cylinder are arranged and arranged on the assembly centered up to the first cylinder based on the maximum outer circle dimension data of the rollers, respectively.
Align and fasten with fixing bolts.

Then, a dimension related to the position of the second cylinder inner wall surface with respect to the main bearing inner wall surface of the first cylinder assembly and a size related to the positional relationship of the second cylinder inner wall surface to the outer wall surface of the first cylinder assembly are determined. Measure. afterwards,
Loosen the bolts, remove the first cylinder assembly, and insert the rollers and crankshaft into the first cylinder assembly.

Next, the partition plate and the second cylinder are mounted again, and the inner wall surface of the main bearing and the inner wall surface of the second cylinder, which are measured earlier,
The alignment is reproduced to the positional relationship between the outer wall surface of the first cylinder assembly and the inner wall surface of the second cylinder, fastened with fixing bolts, and finally the auxiliary bearing is assembled.

As another known example, Japanese Patent Publication No. 8-182
As described in Japanese Patent Laid-Open Publication No. H10 (1995), a method of assembling the main bearing and the first cylinder, and separately aligning the sub-bearing and the second cylinder, and then disposing the crankshaft, the partition plate, and the rollers to assemble the bearing alignment products. Are known.

[0007]

However, in the former method in the prior art, the components such as the second cylinder are temporarily aligned through a member instead of a crankshaft which is actually mounted on a compressor, and the assembly is performed. After measuring the positional relationship between the parts, the assembly is disassembled and reassembled. For this reason, since the assembly work steps are duplicated, the work becomes complicated, and the work efficiency is poor.

Further, when the crankshaft and the rollers are actually assembled, there is a problem that the dimensions cannot be reproduced and aligned. In addition, a special assembling apparatus for measuring a positional relationship dimension is required, and a high-precision component processing step is required because a reference for the positional relationship is provided for the component.

In the latter method, the proper clearance with the cylinder cannot be confirmed when the crankshaft and the rollers are actually mounted. Therefore, the quality such as the compression performance becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a method of assembling a two-cylinder rotary compressor having a high efficiency in assembling work by preventing a decrease in compressor performance due to factors in assembling accuracy. The purpose is to provide.

[0011]

According to the present invention, a roller is fitted into an upper eccentric portion and a lower eccentric portion of a crankshaft, respectively, and is fitted into the outer peripheral surfaces of a crankshaft main shaft portion and a sub shaft portion and the eccentric portion. The maximum outer circle dimension of each roller is measured for both the upper eccentric portion and the lower eccentric portion, and then, the upper eccentric portion and the roller 1 are measured first by combining the main bearing and the first cylinder. After the inner wall surface of the first cylinder is aligned with the appropriate clearance and fastened to the maximum outer circle dimension, the crankshaft, rollers, partition plate, and second cylinder are arranged in this order, and the inner wall surface of the second cylinder and the crankshaft While measuring the relational dimension with the outer peripheral surface of the countershaft, it is appropriate for the maximum outer circle dimension with the outer peripheral surface of the countershaft of the crankshaft with the roller fitted in the lower eccentric part of the crankshaft measured earlier After aligning the inner wall surface of the second cylinder with the clearance, the first cylinder The assembly is equipped with bolts, rollers are mounted, and finally, the sub-bearings are fastened. Since variations in the assembly accuracy of the first cylinder, the second cylinder and the crankshaft can be suppressed, Uniform and high-precision assembly is possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The configuration of the two-cylinder rotary compressor according to the present embodiment shown in FIG. 1 includes an electric motor unit and a compression mechanism unit in a sealed container 1. The compression mechanism is
It has a configuration having two eccentric portions between the main bearing 5 and the sub bearing 10, and is directly connected to the electric motor portion by the crankshaft 4.

The electric motor section includes a stator 2 fixed to the closed casing 1 by shrink fitting or the like and a rotor 3 fixed to the crankshaft 4. The compression mechanism section includes, from the motor side, a main bearing 5 that supports the crankshaft 4, a first compression chamber 6,
It is composed of a partition plate 7, a second compression chamber 8, an auxiliary bearing 10, and a muffler 11.

The first compression chamber 6 and the second compression chamber 8 are respectively provided with cylinders 6a and 8b, eccentric portions 4a of the crankshaft 4,
4b, rollers 9a and 9b are fitted respectively, and a vane (not shown) is provided as a partition of a compression chamber, and the rollers 9a and 9b perform eccentric rotation with the rotation of the crankshaft 4 to perform compression. Has become. These compression mechanisms are composed of a sealed container 1 and a main bearing outer wall surface 5 inscribed therein.
a is welded and fixed.

Next, a method of assembling the compression mechanism will be described in detail with reference to FIGS. First, as shown in FIG. 2, rollers 9 are attached to the upper and lower eccentric portions 4a and 4b of the crankshaft 4, respectively.
While rotating the crankshaft 4 with the a and 9b fitted, the main shaft outer peripheral surface 4c and the sub shaft outer peripheral surface 4c of the crankshaft 4 are rotated.
The maximum outer circle dimensions of the rollers 9a and 9b are measured with reference to d (the relationship shown in both directions in FIG. 2).

These measured values are temporarily stored by a storage means in an assembling apparatus (or centering apparatus) for performing the assembling method in the present embodiment, for use in a process described later.

Next, as shown in FIG. 3, the main bearing 5 and the first cylinder 6a are combined and temporarily fastened with bolts 12a from the main bearing 5 side, and the roller 9a with respect to the previously measured crankshaft main shaft portion 4c is used as a reference. The first cylinder 6a is aligned with an appropriate clearance between the inner wall surface 6b of the first cylinder and the outer wall surface 9c of the roller 9a with respect to the maximum outer circle dimension and fastened with bolts 12a to form a first cylinder assembly.

Thereafter, as shown in FIG. 4, the crankshaft 4 is inserted and mounted on the first cylinder assembly 13 with the roller 9a fitted in the upper eccentric portion 4a. Then, as shown in FIG. 5, the partition plate 7 and the second cylinder 8b are superimposed on the first cylinder 6a in this order, and the two mounting holes 14 provided in the second cylinder 8b and the through holes 7a of the partition plate 7 are used. Bolt 12
b, the second cylinder 8b and the partition plate 7 are temporarily fastened to the first cylinder 6a from the second cylinder side. Here, since the second cylinder 8b is temporarily fastened, it must be fastened after setting an appropriate clearance.

Therefore, the crankshaft 4 in which the roller 9a is fitted into the upper eccentric portion 4a of the crankshaft 4 is mounted on the first cylinder assembly 13, and the partition plate 7 and the second cylinder 8b are temporarily fastened. In this state, the main bearing inner wall surface 5a is brought into contact with the main shaft outer peripheral surface 4c of the crankshaft 4, and the main bearing inner wall surface 5a is contacted.
A state in which the clearance between a and the outer peripheral surface 4c of the main shaft portion of the crankshaft 4 is maintained.

Next, while measuring the positional relationship between the inner wall surface 8c of the second cylinder 8b and the outer peripheral surface 4d of the sub shaft portion of the crankshaft 4 in the X and Y directions, the crankshaft 4 is rotated. In order to provide a predetermined clearance between the inner wall surface 8c of the second cylinder 8b and the measured dimension of the maximum outer circle of the roller 9b with reference to the sub shaft portion 4d of the crankshaft 4, the main bearing inner wall surface 5a and the crankshaft 4 Main shaft outer surface 4
c and the first cylinder assembly 13 and the crankshaft 4 in a state where the clearance between the main bearing inner wall surface 5a and the main shaft portion outer peripheral surface 4c of the crankshaft 4 is eliminated are moved together and aligned. The first cylinder assembly 13 and the second cylinder 8b are fastened with the bolts 12b.

Thereafter, the roller 9b is fitted into the lower eccentric portion 4b of the crankshaft 4, and then the sub bearing 10 is inserted and aligned in the sub shaft portion 4d of the crankshaft 4, and the mounting hole provided therein is provided. Fasten from 10a with bolt 12c (FIG. 6).

As described above, the assembly is performed in order from the main bearing 5, the alignment between the main bearing 5 and the inner wall surface 6 b of the first cylinder 6 a, the roller 9 a fitted into the upper eccentric portion 4 a of the crankshaft 4, Appropriate clearance between the inner wall surface 6b of the first cylinder 6a and the appropriate clearance between the inner wall surface 8c of the second cylinder 8b and the roller 9b fitted into the lower eccentric portion 4b of the crankshaft 4, and the auxiliary bearing 10 and the second The alignment with the inner wall surface 8c of the cylinder 8b is set.

Accordingly, in assembling the compressor according to the present embodiment, it is possible to improve duplication work such as temporary assembly using parts as temporary parts and assembly with parts incorporated in actual machines, and to reduce man-hours. As a result, sufficient assembly accuracy is guaranteed.

Further, since the parts are stacked in order from the main bearing, the setting of the assembling process is facilitated, the automation can be easily achieved, and the assembling work efficiency is improved.

[0025]

As described above, according to the present invention, the accuracy can be checked for each assembly process of the compression mechanism, and the compressor can be assembled with high accuracy. Can be prevented, and a compressor of stable quality can be manufactured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a two-cylinder vertical rotary compressor according to the present invention.

FIG. 2 is a diagram illustrating a measurement state of a maximum outer circle dimension of a roller fitted into an eccentric portion of a crankshaft according to the present invention.

FIG. 3 is a sectional view of a state where the main bearing and the first cylinder according to the present invention are assembled.

FIG. 4 is a cross-sectional view showing a state where a crankshaft and rollers are inserted into an assembly according to the present invention.

FIG. 5 is a sectional view of a state where the partition plate and the second cylinder according to the present invention are assembled.

FIG. 6 is a cross-sectional view of the entire compression mechanism according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Closed container 2 ... Stator 3 ... Rotor 4 ... Crankshaft 5 ... Main bearing 6 ... 1st compression chamber 6a ... 1st cylinder 6b ... 1st cylinder inner wall surface 7 ... Partition plate 8 ... 2nd compression chamber 8b ... 2nd Cylinder 8c: Second cylinder inner wall surface 9a, 9b: Roller 10: Secondary bearing 11: Silencer 12: Bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Senda, inventor 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Inside the Cooling and Refrigerating Dept., Hitachi, Ltd. F-term in Hitachi, Ltd. Cooling Division (Reference) 3H029 AA04 AA13 AB03 BB32 CC17

Claims (2)

[Claims] 1. A method for assembling a two-cylinder rotary compressor having a crankshaft having an electric motor portion and two eccentric portions directly connecting the electric motor portion and the compression mechanism portion inside a closed container, wherein the crankshaft is The upper eccentric part and the lower eccentric part are fitted with rollers, and the maximum outer circle dimension of each roller fitted into the eccentric part with respect to the main shaft part and the sub shaft part of the crankshaft is measured. A first cylinder assembly, which is a combination of a main bearing for bearing the main shaft portion and a first cylinder forming a compression chamber corresponding to the upper eccentric portion, has a maximum size of a roller fitted in the upper eccentric portion. The first cylinder is aligned with the main bearing on the basis of the outer circle dimension and assembled. The assembled first cylinder assembly is assembled with the crankshaft, the roller, the first cylinder and the lower cylinder. Pressure corresponding to eccentric part A partition plate separating the second cylinder forming the contraction chamber, and the second cylinder are arranged in order, and a relational dimension between the inner wall surface of the second cylinder and the outer peripheral surface of the countershaft portion of the crankshaft is measured. Then, the inner wall surface of the second cylinder is adjusted so as to have an appropriate clearance with respect to the maximum outer circle dimension with respect to the outer peripheral surface of the sub shaft portion of the crankshaft in a state where the roller is fitted in the lower eccentric portion measured earlier. Wherein the second cylinder is centered and fastened to the first cylinder assembly, and the sub-bearing is aligned and fastened.
How to assemble a cylinder rotary compressor. 2. The method for assembling a two-cylinder rotary compressor according to claim 1, wherein said crankshaft, said roller, said partition plate, and said second cylinder are sequentially mounted on said first cylinder assembly. Then, when the second cylinder is fastened to the first cylinder assembly, the inner wall surface of the main bearing and the outer peripheral surface of the main shaft portion of the crankshaft are brought into contact with each other to make the inner wall surface of the main bearing and the outer peripheral surface of the main shaft portion. A method of aligning the inner wall surface of the second cylinder and fastening the second cylinder to the first cylinder assembly in a state where the clearance between the two cylinders is eliminated.