JP2002317766A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor for facilitating the positioning of a connection pipe, a suction pipe and a discharge pipe in the axial direction, assuring easy work for welding and brazing and producing an increase in bending strength of the suction pipe and the discharge pipe. SOLUTION: The hermetic compressor comprises a sealed container to which the suction pipe 8e for introducing a suction cooling medium to a compression part and the discharge pipe 9e for introducing a compression cooling medium in the compression part to the outside are connected, wherein connection pipe insertion holes 8b, 9b cylindrically protruded to the inside are provided in the sealed container and the connection pipes 8d, 9d with one ends inserted to the tips of the ends of protruded portions 8a, 9a and the other ends enlarged at the outside of the sealed container has connection portions 8c, 9c locked to the outer periphery edges of the connection pipe insertion holes 8b, 9b, the suction pipe 8e and/or the discharge pipe 9e being inserted and connected to the enlarged pipe portions 8c, 9c, the ends of the protruded portions 8a, 9a and the outer peripheries of the connection pipes 8d, 9d being joined to the outer peripheries of the connection pipe insertion holes 8b, 9b and the enlarged pipe portions 8c, 9c with welding 10, and the ends of the enlarge pipe portions 8c, 9c being joined to the suction pipe 8e and the discharge pipe 9e with brazing 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used for an air conditioner or the like, and more particularly, to an improvement in a piping structure such as a suction pipe and a discharge pipe connected to a closed container.

[0002]

2. Description of the Related Art A conventional hermetic compressor is shown in FIGS.
As shown in FIG. 6A and FIG. 6B, an electric motor 2 and a compression unit 3 are arranged in a closed container 1 including a bottomed cylindrical body 1a and a lid 1b. A fixed scroll 4 having a spiral wrap on a head plate;
The orbiting scroll 5 is configured to form a plurality of compression chambers 3a by meshing with each other, and a main frame 6 for fixedly supporting the fixed scroll 4 and the like.

[0003] A discharge chamber 7 in which the compressed refrigerant in the compression chamber 3a is discharged from a discharge port 4a formed substantially at the center of the fixed scroll 4, and a motor chamber for accommodating the motor 2 in the closed container 1. 2a, and the suction chamber 3b of the compression unit 3
A suction pipe 8 ′ for guiding the suctioned refrigerant is connected to the discharge chamber 7, and a discharge pipe 9 ′ for discharging the compressed refrigerant to the outside of the closed container 1 is connected to the discharge chamber 7.

[0006] FIG. 6A shows that the suction pipe 8 ′ and the discharge pipe 9 ′ made of a copper material are inserted into the insertion hole a of the closed container 1, and the suction tube 8 ′ and the FIG. 6 (B) shows a double structure in which the suction pipe 8 ′ and the discharge pipe 9 ′ are inserted into the insertion hole a ′ of the sealed container 1 through the connection pipe b, The airtight container 1 is joined to the connection pipe b, the suction pipe 8 ', and the discharge pipe 9' by brazing 11, respectively, to strengthen the joint.

[0005] However, the suction pipe 8 'having the above-described structure is used.
When the discharge pipe 9 'is made of a copper material (copper pipe), the copper pipe is easily damaged by bending or the like at the time of assembling the stator of the electric motor 2 at the time of assembling, etc., or at the time of transporting the machined parts. At the time of overload operation, the inside of the sealed container 1 becomes high pressure, and there is a possibility that a leak or a brazing portion may be damaged due to a differential pressure between inside and outside. In addition, when a high-pressure HFC refrigerant such as R410A, CO2 (carbon dioxide) refrigerant which does not destroy the ozone layer is used as a refrigerant, a stronger pressure resistance than when a conventional HCFC refrigerant is used for a suction pipe mechanism and a discharge pipe mechanism. Required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and facilitates axial positioning of a connecting pipe, a suction pipe, and a discharge pipe, and also facilitates welding and brazing operations. Further, it is an object of the present invention to provide a hermetic compressor which can be surely performed and can further increase the bending strength of a suction pipe and a discharge pipe.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An electric motor and a compression section are disposed in a closed container, and the suction refrigerant is guided to the compression section in the closed container. In a hermetic compressor in which a suction pipe is hermetically connected to a discharge pipe that leads the compressed refrigerant of the compression section to the outside of the hermetic container, a connecting pipe inserted into the hermetic container in a cylindrical shape is provided. A connection in which a hole is provided and one end is inserted to the tip of the protruding portion, and the other end is expanded in a tapered shape outside the closed vessel, and the expanded portion is engaged with the outer peripheral edge of the connection pipe insertion hole. A pipe is provided, and the suction pipe and / or the discharge pipe are inserted and connected to the expanding section, and the tip of the protruding portion and the outer peripheral section of the connecting pipe are connected to the outer peripheral section of the connecting pipe insertion hole and the expanding section, respectively. While joining by welding, the end of the expanded portion and the suction pipe and Or it has a structure joined by brazing and a discharge pipe.

[0008] In addition, the vicinity of the connection pipe insertion hole on the outer surface of the closed container is flattened.

Further, the suction pipe and / or the discharge pipe are inserted into the expanded portion by press fitting.

Further, one end of the connection pipe is connected to a suction section of the compression section, and a seal member is provided at a contact portion between the outer circumference of the connection pipe and the compression section.

Further, the suction pipe and / or the discharge pipe are formed such that the distal end thereof has a small diameter, and is inserted up to the distal end of the connection pipe inside the closed container.

Further, the connection pipe is made of an iron-based material, and the suction pipe and the discharge pipe are made of a copper-based material.

Further, a high pressure HFC refrigerant such as R410A and CO2 refrigerant is used as the refrigerant.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as examples. FIG. 1 is a sectional view of a hermetic compressor according to the present invention, and FIG. 2 is an enlarged sectional view of a main part according to the present invention. In the figure, the hermetic compressor has a motor 2 and a compression section 3 arranged in a closed vessel 1 having a bottomed cylindrical body 1a and a lid 1b, and the compression section 3 has a spiral shape on a head plate. The fixed scroll 4 includes a fixed scroll 4, an orbiting scroll 5 that meshes with the fixed scroll 4 to form a plurality of compression chambers 3 a, a main frame 6 that fixedly supports the fixed scroll 4, and the like.

A discharge chamber 7 for discharging the compressed refrigerant in the compression chamber 3a from a discharge port 4a formed in a substantially central portion of the fixed scroll 4, and a motor chamber for housing the motor 2 in the closed container 1. 2a, and the suction chamber 3b of the compression unit 3
A suction mechanism 8 for guiding the suctioned refrigerant is connected to the discharge chamber 7, and a discharge mechanism 9 for discharging the compressed refrigerant to the outside of the closed container 1 is connected to the discharge chamber 7.

The suction mechanism 8 and / or the discharge mechanism 9
Is provided with connection pipe insertion holes 8b, 9b provided with cylindrically projecting portions 8a, 9a inward in the closed container 1, and one end is inserted to the tip of the projecting portions 8a, 9a. A connection pipe 8 whose end is expanded in a tapered shape outside the closed vessel 1 and whose expanded portions 8c, 9c are engaged with the outer peripheral edges of the connection pipe insertion holes 8b, 9b.
d, 9d, and a suction pipe 8e and / or a discharge pipe 9e are inserted and connected to the expanded pipe sections 8c, 9c, and the distal ends of the protruding sections 8a, 9a and the outer peripheral portions of the connection pipes 8d, 9d are connected to each other. Connection tube insertion holes 8b, 9
b, the outer peripheral portion and the expanded portions 8c, 9c are joined by welding 10, respectively, while the distal end of the expanded portions 8c, 9c and the suction tube 8e and / or the discharge tube 9e are joined by brazing 11. Has become.

The outer surface of the closed container 1 (for example, the lid 1
b) The vicinity of the connection pipe insertion holes 8b, 9b is made into a flat part 1b ', and the protruding parts 8a, 9a are machined into a cylindrical shape by pressing. Into the connection pipe insertion holes 8b, 9b, and the suction pipe 8e.
And / or while the discharge pipe 9e is inserted into the expanded pipe sections 8c, 9c by press fitting, the closed vessel 1 and the connection pipes 8d, 9d are inserted.
By using a copper material for the suction pipe 8e and the discharge pipe 9e, the connection pipes 8d, 9d, the suction pipe 8e, and the discharge pipe 9e can be easily positioned in the axial direction. The work of welding 10 and brazing 11 can be performed easily and reliably, and the bending strength of the suction pipe 8e and the discharge pipe 9e can be increased.

FIG. 3 shows another embodiment of the present invention. One end of the connection pipe 8d on the suction mechanism 8 side is connected to the suction chamber 3b of the compression section 3, and the connection pipe 8d is connected to the suction chamber 3b. By providing the sealing member 12 at the contact portion between the outer peripheral portion and the compression portion 3, the joint between the closed container 1 and the suction pipe 8e is reinforced in the same manner as described above.

FIG. 4 shows still another embodiment of the present invention, in which the distal end side of the discharge pipe 9e on the discharge mechanism 9 side is formed to have a small diameter, and the inside of the closed vessel 1 of the connection pipe 9d is formed. With the configuration in which the distal end is inserted, the joint between the sealed container 1 and the discharge pipe 9e is strengthened in the same manner as described above.

In addition, the refrigerant does not destruct the ozone layer.
410A, high pressure HFC such as CO2 (carbon dioxide) refrigerant
When a refrigerant is used, a higher pressure resistance is required for the suction mechanism 8 and the discharge mechanism 9 than when a conventional HCFC refrigerant is used. However, the structure of the present invention can sufficiently withstand the strength.

In the above-mentioned structure, the vicinity of the connection pipe insertion holes 8b, 9b on the outer surface of the closed vessel 1 is made a flat portion 1b ', and the protruding portions 8a, 9a are machined into a cylindrical shape by pressing. From the outside of the container 1, the connection pipes 8d, 9d are inserted into the connection pipe insertion holes 8b, 9b, and the suction pipe 8e and / or the discharge pipe 9e are inserted into the expansion pipe sections 8c, 9c by press fitting. , Iron material in the closed container 1 and the connection pipes 8d, 9d,
By using a copper material for the suction pipe 8e and the discharge pipe 9e, the connection pipes 8d, 9d, the suction pipe 8e, and the discharge pipe
9e axial positioning is easy and the welding
The hermetic compressor can easily and reliably perform the operations of 10 and brazing 11, and can increase the bending strength of the suction pipe 8e and the discharge pipe 9e.

[0022]

As described above, in the present invention, the connecting pipe, the suction pipe and the discharge pipe can be easily positioned in the axial direction, and the welding and brazing operations can be performed easily and reliably. The hermetic compressor can increase the bending strength of the pipe and the discharge pipe.

[Brief description of the drawings]

FIG. 1 is a transverse sectional view of a hermetic 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 an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing still another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part of a hermetic compressor showing a conventional example.

FIG. 6 is an enlarged sectional view of a main part showing a conventional example, in which (A) is a first example and (B) is a second example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 1a Body 1b Lid 2 Electric motor 3 Compressor 3a Compression chamber 3b Suction chamber 4 Fixed scroll 4a Discharge port 5 Orbiting scroll 6 Main frame 7 Discharge chamber 8 Suction mechanism 8a, 9b Projection 8b, 9b Connection pipe insertion hole 8c, 9c Expanding section 8d, 9d Connecting pipe 8e Suction pipe 9 Discharge mechanism 9e Discharge pipe 10 Welding 11 Brazing 12 Sealing material

Claims (7)

[Claims] 1. An electric motor and a compression section are arranged in a closed container, and a suction pipe for guiding the suction refrigerant to the compression section is led out of the closed section to the outside of the closed container. In a hermetic compressor in which discharge pipes are hermetically connected, the hermetic container is provided with a connection pipe insertion hole projecting inwardly in a cylindrical shape, and one end is inserted up to the tip of the protruding portion. The end is expanded in a tapered shape outside the closed container,
The pipe expansion section is provided with a connection pipe which is engaged with an outer peripheral edge of the connection pipe insertion hole, the suction pipe and / or the discharge pipe are inserted and connected to the expansion pipe section, and the tip of the projecting portion and the connection pipe outer peripheral section are connected. And the outer peripheral portion of the connection pipe insertion hole and the expanded pipe portion are respectively joined by welding, and the distal end of the expanded pipe section and the suction pipe and / or the discharge pipe are joined by brazing. And hermetic compressor. 2. The hermetic compressor according to claim 1, wherein the outer surface of the hermetic container is made flat near the connection pipe insertion hole. 3. The hermetic compressor according to claim 1, wherein the suction pipe and / or the discharge pipe are inserted into the expanded pipe section by press fitting. 4. An end of the connecting pipe is connected to a suction section of the compression section, and a sealing material is provided at an abutting section between the outer peripheral section of the connection pipe and the compression section. The hermetic compressor as described. 5. The suction pipe and / or the discharge pipe are formed to have a small diameter at a tip end thereof, and are inserted up to a tip of the connection pipe inside the sealed container. Hermetic compressor. 6. The connection pipe according to claim 1, wherein an iron-based material is used for the connection pipe, and a copper-based material is used for the suction pipe and the discharge pipe. The hermetic compressor as described. 7. The hermetic compressor according to claim 1, wherein a high-pressure HFC refrigerant such as R410A or CO2 refrigerant is used as the refrigerant.