JP2001227470A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of centering adjustment of a rotation shaft. SOLUTION: In this hermetic compressor, a main frame 2, a sub frame 3, a compressing mechanism part 4 mounted to the main frame, a motor part 5 to drive the compressing mechanism part, a rotation shaft 6 one end of which is journalled to the rotation bearing 2a of the main frame and other end of which is journalled to the sub-bearing 3a of the sub-frame in order to transmit the rotatory power of the motor part to the compressing mechanism part, and an oil pump 7 provided at the other end of the rotation shaft are contained and disposed in an enclosure equipped with a suction pipe 1a and a discharge pipe 1b, an oil feeding passage is provided in the rotation shaft, and a lubricant filled in the enclosure through the oil feeding passage is fed to the rotation bearing and the sub-bearing by the pump. Since the sub-frame is divided into sub-bearing part 31 having the sub-bearing and a shell assembling part 32 fixed to the enclosure, the centering adjustment of the rotation shaft can be easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor, and more particularly, to a bearing for a rotary shaft for transmitting a rotational force of a motor to a compression mechanism.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a hermetic compressor is mounted on a main frame 2, a sub-frame 3, and a main frame 2 in a closed vessel 1 having a suction pipe 1a and a discharge pipe 1b. Compression mechanism 4, an electric motor 5 for driving the compression mechanism 4, and one end of the main frame 2 for transmitting the rotational force of the electric motor 5 to the compression mechanism 4.
The rotary shaft 6 is rotatably supported by a rotary bearing 2a provided on the sub-frame 3 and the other end is rotatably supported by a sub-bearing 3a provided on the sub-frame 3. The oil pump 7 is supported and accommodated, and an oil supply passage 6 a is provided in the rotary shaft 6.
The lubricating oil sealed in the closed container 1 is supplied to the rotary bearing 2a and the sub-bearing 3a through the a. The centering of the rotary shaft 6 is performed when the sub-frame 3 is fixed to the closed container 1. As a method of fixing the sub-frame 3 to the closed container 1, a welding method is generally adopted. However, it is difficult to perform centering adjustment of the rotary shaft 6 by the welding method, which causes noise and vibration.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a hermetic compressor capable of easily performing centering adjustment of a rotating shaft.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a main frame, a sub-frame, and a compression mechanism mounted on the main frame in a closed container having a suction pipe and a discharge pipe. An electric motor section for driving the compression mechanism section, and one end provided on a rotary bearing provided on the main frame for transmitting the rotational force of the electric motor section to the compression mechanism section, and the other end provided on the sub-frame. A rotary shaft that is supported by the auxiliary bearing, and an oil pump that is provided at the other end of the rotary shaft and that is supported by the sub-frame.
In the hermetic compressor, an oil supply passage is provided in the rotary shaft, and the rotary pump and the sub-bearing are configured to supply lubricating oil sealed in the sealed container to the rotary bearing and the sub-bearing through the oil supply passage by the oil pump. The hermetic compressor includes a sub-bearing having a sub-bearing and a shell assembly to which the sub-bearing is attached and fixed to the hermetic container.

[0005] While an insertion hole is provided in the sub-bearing portion, a screw hole corresponding to the insertion hole is provided in the shell assembling portion, and a screw is screwed into the screw hole from the insertion hole to form the sub-bearing portion into a shell. It is a hermetic compressor fixed to the assembly part.

[0006] A hermetic compressor in which the diameter of the insertion hole has a size provided with a clearance for adjusting the centering of the rotary shaft.

The hermetic compressor is provided with a gap between the outer peripheral surface of the sub-bearing portion and the inner peripheral surface of the hermetic container, which is larger than the clearance provided in the insertion hole.

The hermetic compressor is provided with a gas passage hole for passing gas sucked from the suction pipe in the auxiliary bearing portion and an oil passage hole for passing lubricating oil sealed in the closed container.

[0009] A hermetic compressor in which the shell assembly portion is fixed to the hermetic container by welding.

A hermetic compressor in which the shell assembly is formed in a ring shape.

[0011] The hermetic compressor is an hermetic compressor in which the outer periphery of the shell assembly portion is formed in an L-shaped cross section.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hermetic compressor according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view showing a main part of an embodiment of a hermetic compressor according to the present invention, and FIG. 2 is an enlarged exploded perspective view of the main part. As shown in FIG. 1, the hermetic compressor according to the present invention includes a main frame 2 and a sub-frame 3 in a hermetically sealed container 1 having a suction pipe 1a and a discharge pipe 1b.
And a compression mechanism 4 mounted on the main frame 2
An electric motor unit 5 for driving the compression mechanism unit 4, and one end rotatably supported by a rotary bearing 2 a provided on the main frame 2 for transmitting the rotational force of the electric motor unit 5 to the compression mechanism unit 4. A rotary shaft 6 whose end is rotatably supported by a sub-bearing 3 a provided on the sub-frame 3, and an oil pump 7 provided at the other end of the rotary shaft 6 and supported by the sub-frame 3 are housed and arranged, An oil supply passage 6a is provided in the rotary shaft 6, and the oil pump 7 supplies lubricating oil sealed in the closed container 1 to the rotary bearing 2a and the sub-bearing 3a via the oil supply passage 6a. . And the sub-frame 3
Is formed in a ring shape with the sub-bearing portion 31 having the sub-bearing 3a, and is fixed to the airtight container 1.
1 is divided into a shell assembly part 32 to which the screw 8 is attached.

Further, as shown in FIG.
A pump mounting hole 3b for mounting the sub-bearing 3a and the oil pump 7 is formed at the center of 1 and an insertion hole having a clearance around the periphery thereof having a clearance required for centering adjustment of the rotary shaft. 31a, a gas passage hole 31b for passing gas sucked from the suction pipe 1a, and an oil passage hole 31c for passing lubricating oil sealed in the closed container 1 are formed. The insertion hole 31 is provided between an outer peripheral surface 31 d of the auxiliary bearing portion 31 and an inner peripheral surface 1 c of the closed container 1.
A gap larger than the clearance provided in a is provided. On the other hand, the shell mounting portion 32 is provided with a screw hole 32a corresponding to the insertion hole 31a,
2b is formed in an L-shaped cross section, and the inner peripheral surface 1c of the closed container 1
To facilitate welding.

Next, the procedure for assembling the above structure will be described. It is assumed that the main frame 2, the compression mechanism 4, the electric motor 5, and the rotary shaft 6 have already been assembled in the closed container 1. Hereinafter, the incorporation of the sub-frame 3 and the oil pump 7 will be described. First, the shell assembly section 32
Is welded to a predetermined position on the inner peripheral surface 1c of the closed container 1 at a predetermined angle. The welding of the shell assembly portion 32 may be performed before the main frame 2, the compression mechanism portion 4, the electric motor portion 5, the rotating shaft 6, and the like are assembled in the closed container 1. Next, the rotating shaft 6 is inserted into the sub-bearing 3a of the sub-bearing portion 31, the screw 8 is inserted through the insertion hole 31a, screwed into the screw hole 32a, and temporarily fixed. Next, oil pump 7
Is connected to the rotary shaft 6 and mounted in the pump mounting hole 3b. Next, the motor unit 5 is rotated, the centering is adjusted, and the screw 8 is fully tightened. Next, the hermetically sealed container 1 is sealed and completed.

[0015]

As described above, according to the hermetic-type compressor of the present invention, the main frame, the sub-frame, and the compression mechanism mounted on the main frame are provided in the hermetically sealed container having the suction pipe and the discharge pipe. Part, an electric motor part for driving the compression mechanism part, and one end supported by a rotary bearing provided on the main frame for transmitting the rotational force of the electric motor part to the compression mechanism part, and the other end to the sub-frame. A rotary shaft that is supported by a sub-bearing provided on the rotary shaft, and an oil pump that is provided at the other end of the rotary shaft and that is supported by the subframe. A hermetic compressor in which lubricating oil sealed in the hermetic container is supplied to the rotary bearing and the sub-bearing through the oil supply passage by the oil pump, wherein the sub-frame has the sub-bearing. Department and Since the auxiliary bearing portion is mounted and divided into a shell assembly portion fixed to the closed container, the centering adjustment of the rotating shaft is easy, and the hermetic compressor with reduced noise and vibration is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of an embodiment of a hermetic compressor according to the present invention.

FIG. 2 is an enlarged exploded perspective view showing a main part of an embodiment of the hermetic compressor according to the present invention.

FIG. 3 is a side sectional view showing a main part of a conventional hermetic compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 1a Suction pipe 1b Discharge pipe 1c Inner peripheral surface of closed container 1 Main frame 2a Rotation bearing 3 Subframe 3a Sub bearing 3b Pump mounting hole 4 Compression mechanism part 5 Electric motor part 6 Rotation shaft 6a Oil supply passage 7 Oil pump 8 Screw 31 Secondary bearing portion 31a Insertion hole 31b Gas passage hole 31c Oil passage hole 31d Outer peripheral surface 32 Shell assembling portion 32a Screw hole 32b Outer periphery of shell assembling portion 32

Claims (8)

[Claims] 1. A main frame, a sub-frame, a compression mechanism mounted on the main frame, an electric motor for driving the compression mechanism, and an electric motor in an airtight container having a suction pipe and a discharge pipe. A rotating shaft that is rotatably supported at one end by a rotary bearing provided on the main frame and that has the other end supported by a sub-bearing provided on the sub-frame to transmit the rotational force to the compression mechanism; And an oil pump supported by the sub-frame is provided at the other end of the rotary shaft. An oil supply passage is provided in the rotary shaft, and the oil pump is sealed in the closed container via the oil supply passage. In the hermetic compressor configured to supply the lubricating oil to the rotary bearing and the sub-bearing, the sub-frame is provided with the sub-bearing portion having the sub-bearing, and the sub-bearing portion is attached and fixed to the hermetic container. Ruche Hermetic compressor, characterized by comprising divided form into the assembling portion. 2. An insertion hole is provided in the auxiliary bearing portion, and a screw hole corresponding to the insertion hole is provided in the shell assembly portion.
The hermetic compressor according to claim 1, wherein a screw is screwed into the screw hole from the insertion hole to fix the sub-bearing portion to the shell assembly portion. 3. The hermetic compressor according to claim 2, wherein the diameter of the insertion hole is set to a size provided with a clearance for adjusting the centering of the rotating shaft. 4. A clearance between the outer peripheral surface of the sub-bearing portion and the inner peripheral surface of the closed container is provided with a gap larger than a clearance provided in the insertion hole. Hermetic compressor. 5. The sub-bearing portion is provided with a gas passage hole for passing gas sucked from the suction pipe and an oil passage hole for passing lubricating oil sealed in the closed container. The hermetic compressor according to claim 1. 6. The hermetic compressor according to claim 1, wherein the shell assembly is fixed to the hermetic container by welding. 7. The hermetic compressor according to claim 1, wherein the shell assembly is formed in a ring shape. 8. The hermetic compressor according to claim 1, wherein an outer periphery of said shell assembly portion is formed in an L-shaped cross section.