JP2001082354A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability on holding of airtightness by partitioning a discharge chamber on the high pressure side and an electric motor chamber on the low pressure side from each other by a main frame, to reduce the number of parts, and to reduce the number of assembling works. SOLUTION: A scroll compressor is formed such that an electric motor and a compression part 3 driven by the electric motor are situated in a closed contained 1 consisting of a closed end cylindrical drum body 1a and a cover body 1b, a compression part 3 is formed into a plurality of compression chambers by engaging a fixed scroll, having a spiral lap, and a swirl scroll with an end plate, a discharge chamber 11 for compression gas discharged through a discharge port 4a formed in the end plate of the fixed scroll 4 and a low pressure electric motor chamber 2a to contain the electric motor are partitioned from each other, and a main frame 10 to slidably support the swirl scroll is provided. A step part 10a notched downward is formed throughout the whole of the outer peripheral surface of the main frame 10 and the tip surface of a drum body 1a is securely adhered to the step part 10a through an annular packing.

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 mounting structure of a main frame and a hermetic container which separate a high-pressure discharge chamber and a low-pressure motor chamber and maintain airtightness.

[0002]

2. Description of the Related Art As shown in FIG. 4, for example, a conventional scroll compressor has a cylindrical body 1a having a bottom and an opening on one side, and a lid body.
1b, a motor 2 and a compression unit 3 driven by the motor 2 are arranged on the left and right sides, and the compression unit 3 is fixed to a fixed scroll 4 having a spiral wrap on the inner surface of a head plate.
And the orbiting scroll 5 are engaged with each other to form a plurality of compression chambers 6, and the orbiting drive shaft 5a of the orbiting scroll 5
Shaft 9 having a lubricating oil supply passage 8 penetrating from the left end to the right end by forming a crankshaft into which the lubricating oil is inserted and rotating and driving.
And the main frame 10 that supports the crankshaft constitutes a scroll compressor.

[0003] The inside of the closed container 1 is
A low pressure side and a high pressure side are divided by a compression unit 3 including 10 and the fixed scroll 4, and the high pressure side is defined as a discharge chamber 11 of a compressed gas discharged from a discharge port 4 a provided at the center of the end plate of the fixed scroll 4. The low-pressure side is an electric motor room 2a that houses the electric motor 2, and constitutes an internal low-pressure scroll compressor. At the same time as the low-pressure refrigerant gas is sucked into the motor room 2a through the suction pipe 12 connected to the motor room 2a,
The compressed gas sucked into the compression section 3 and compressed by the compression section 3 is discharged to the outside from the discharge pipe 13 via the discharge chamber 11.

In the above configuration, the main frame 10
The contact surface between the outer peripheral surface of the fixed scroll 4 and the inner peripheral surface of the body 1a is joined by spot welding. However, a slight gap is formed in the contact surface, and refrigerant gas on the high pressure side leaks to the low pressure side. As a result, there is a problem that the compression efficiency is reduced. As a countermeasure, for example, a disk-shaped partition wall 14 'is provided on the discharge chamber 11 side, and a central portion of the partition wall 14' is joined to the fixed scroll 4, and an outer peripheral portion of the partition wall 14 'is provided between the body 1a and the lid 1b. The partition wall 14 'and the entire periphery of the distal end of the lid 1b are sealed by welding to hermetically separate the high-pressure side and the low-pressure side.

However, in the case of the above configuration, the partition 1
The joint between 4 'and fixed scroll 4 needs precision,
Further, an annular packing 14a is required to prevent gas leakage at the joint. In this case, there is a problem in that the structure becomes complicated and the number of parts increases, so that reliability and cost are disadvantageous.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a main frame that divides a high-pressure side discharge chamber and a low-pressure side motor chamber to improve the reliability of maintaining airtightness. It is another object of the present invention to provide a scroll compressor capable of reducing the number of parts and reducing the number of assembling steps.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises an electric motor and a compression unit driven by the electric motor in a closed container having a bottomed cylindrical body and a lid. The fixed scroll and the orbiting scroll having a spiral wrap on the end plate of the same compression portion form a plurality of compression chambers by meshing with each other, and are discharged from discharge ports provided in the end plate of the fixed scroll. A high-pressure discharge chamber for compressed gas, and a low-pressure motor chamber that houses the motor, and a main frame that slidably supports the orbiting scroll. The outer peripheral surface is provided with a stepped portion which is notched downward over the entire circumference, and the stepped portion is closely fixed to the tip end surface of the body through an annular packing.

In addition, the packing is made of heat-resistant carbon.

Further, the packing is made of a copper material.

[0010] Further, the distal end surface of the lid is separated from the packing and fixed to the outer periphery of the body by welding.

Further, the main frame is pressed against the body and fixed by a plurality of spot weldings.

Further, the spot welding is a projection welding.

[0013]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of the present invention, and FIG. In the figure, a cylindrical body 1a with a bottom that opens on one side and a lid
1b and a motor 2 in a closed container 1
The compression unit 3 driven by is arranged up and down, and the compression unit 3 is
The fixed scroll 4 having a spiral wrap on the inner surface of the end plate and the orbiting scroll 5 are meshed with each other to form a plurality of compression chambers 6, and the orbiting drive shaft of the orbiting scroll 5
A scroll compressor is formed by a shaft 9 having a lubricating oil supply passage 8 penetrating from the upper end to the lower end, and a main shaft 10 supporting the crankshaft 7. Make up.

In the closed container 1, the main frame
A low pressure side and a high pressure side are divided by a compression unit 3 including 10 and the fixed scroll 4, and the high pressure side is defined as a discharge chamber 11 of a compressed gas discharged from a discharge port 4 a provided at the center of the end plate of the fixed scroll 4. The low-pressure side is an electric motor room 2a that houses the electric motor 2, and constitutes an internal low-pressure scroll compressor. At the same time as the low-pressure refrigerant gas is sucked into the motor room 2a through the suction pipe 12 connected to the motor room 2a,
The compressed gas sucked into the compression section 3 and compressed by the compression section 3 is discharged to the outside from the discharge pipe 13 via the discharge chamber 11.

The main frame 10 is provided with a stepped portion 10a which is notched downward over the entire circumference on the outer peripheral surface, and is closely fixed to the tip end surface of the body 1a through an annular packing 14 in the stepped portion 10a. ing.

Further, by employing a structure using heat-resistant carbon for the packing 14, the occurrence of scratches on the main frame 10 and the body 1a and the like is suppressed, and the heat from the high-pressure side under a high temperature is sufficiently endured. be able to.

The use of a copper material for the packing 14 facilitates the processing of the packing 14 and is advantageous in cost.

Further, the distal end surface of the lid 1b is fixed to the outer peripheral portion of the body 1a by welding 15 while being slightly separated from the packing 14 in a range where the main frame 10 and the body 1a overlap. Thereby, the packing 14 can be protected from heat during welding.

The main frame 10 is connected to the body 1a.
, And fixed by a plurality of projection welding (point welding) 16.

In the above construction, a stepped portion 10a which is notched downward over the entire outer periphery of the main frame 10 is provided, and an annular packing 14 is interposed in the stepped portion 10a.
By adopting a configuration in which the pressure chamber is tightly fixed to the distal end surface of 1a, gas leakage from the discharge chamber 11 on the high pressure side to the motor chamber 2a on the low pressure side can be prevented, and the reliability of airtightness can be improved. The scroll compressor has a reduced number of parts and a reduced number of assembly steps.

[0021]

As described above, according to the present invention, a stepped portion is provided on the outer peripheral surface of the main frame, and the stepped portion is cut down over the entire circumference, and an annular packing is interposed in the stepped portion to closely contact the tip end surface of the body. By adopting a fixed configuration, gas leakage from the high-pressure side discharge chamber to the low-pressure side motor room can be prevented, the reliability of airtightness can be improved, the number of parts can be reduced, and the number of assembly steps can be reduced. The scroll compressor can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing an embodiment of the present invention.

FIG. 3 is a development view of a main part showing an embodiment of the present invention.

FIG. 4 is a side sectional view of a scroll compressor showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 1a Body 1b Lid 2 Electric motor 2a Motor room 3 Compression part 4 Fixed scroll 4a Discharge port 5 Orbiting scroll 5a Orbital drive shaft 6 Compression chamber 7 Crankshaft 8 Lubricating oil passage 9 Shaft 10 Main frame 11 Discharge chamber 12 Suction Pipe 13 Discharge pipe 14 Packing 15 Welding 16 Projection welding

Claims (7)

[Claims] An electric motor and a compression unit driven by the electric motor are arranged in a closed container having a bottomed cylindrical body and a lid, and the compression unit is provided with a spiral wrap on a head plate. A scroll and an orbiting scroll mesh with each other to form a plurality of compression chambers, a high-pressure discharge chamber for compressed gas discharged from a discharge port provided in the end plate of the fixed scroll, and a low-pressure motor housing the motor And a main frame for partitioning the chamber and slidably supporting the orbiting scroll. A scroll compressor having a ring packing interposed therebetween and closely fixed to a tip end surface of the body. 2. The scroll compressor according to claim 1, wherein said packing is made of heat-resistant carbon. 3. The scroll compressor according to claim 1, wherein said packing is made of a copper material. 4. The scroll compressor according to claim 1, wherein a distal end surface of the lid is fixed to the outer periphery of the body by welding while being separated from the packing. 5. The scroll compressor according to claim 1, wherein a front end surface of the lid is within a range where the main frame and the body overlap. 6. The scroll compressor according to claim 1, wherein the main frame is pressed against the body and fixed by a plurality of spot weldings. 7. The scroll compressor according to claim 5, wherein said spot welding is projection welding.