JP2909984B1 - Manufacturing method of compressor and pipe expansion jig used for manufacturing method - Google Patents

Abstract

A compressor interposed in a refrigeration cycle,
By connecting the one end of the liner and the heat medium inlet of the compression chamber without using a means of press-fitting, it is not necessary to cut one end of the liner before press-fitting, and at the same time, the surface of one end of the liner is cut off. This eliminates the risk of the resulting small pieces entering the compression chamber. SOLUTION: One end of a cylindrical liner 4 is connected to a heat medium inlet 2 communicating with a compression chamber of a compression element inside a closed vessel 1. A copper tube is used for the liner 4, and one end 4 of the liner 4 is used.
The connection between 1 and the heat medium inlet 2 is performed by pressing the cylindrical wall of the liner 4 from the inside to the outside in the radial direction to increase the diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly to a compressor interposed in a refrigeration cycle of an air conditioner.

[0002]

2. Description of the Related Art In a compressor of this type, a heat medium outlet of an accumulator for accumulating a heat medium in a pressurized state and a heat medium inlet communicating with a compression chamber of a compression element disposed inside a closed container are provided. As means for communication, a measure has been taken in which one end of a cylindrical liner is connected to a heat medium inlet communicating with a compression chamber, and the other end of the liner is connected to a heat medium outlet of an accumulator.

Conventionally, a connection between one end of the liner and a heat medium inlet communicating with the compression chamber has a structure in which one end of a cylindrical iron liner is press-fitted into the heat medium inlet after cutting. I was

[0004]

However, it is cumbersome to cut one end of the iron liner before press-fitting it into the heat medium inlet, which has been a factor of high cost. Further, when one end of the liner is press-fitted into the heat medium inlet, there is a possibility that a small piece generated by shaving one end surface of the liner at the time of press-fitting may enter the compression chamber.

On the other hand, a tube forming the heat medium outlet of the accumulator is fitted in the other end of the liner connected to the heat medium inlet, and the tube and the other end of the liner are joined by brazing. Is done. For this reason, when an iron liner is used, it is necessary to previously apply copper plating to a brazing portion of the liner so that brazing can be performed easily and reliably.

The present invention has been made under the above circumstances. By connecting one end of the liner to the heat medium inlet of the compression chamber without using a means of press-fitting, one end of the liner before press-fitting is connected. It is an object of the present invention to provide a compressor that does not require cutting of a portion and that does not cause a situation in which a small piece generated by shaving one end surface of a liner enters a compression chamber.

Another object of the present invention is to provide a compressor in which it is not necessary to perform an operation such as previously applying copper plating to a brazing portion of a liner.

[0008]

SUMMARY OF THE INVENTION A compressor according to the present invention is manufactured.
In the manufacturing method , a heat medium inlet communicating with the compression chamber is formed in a compression element disposed inside the closed container, and one end of a cylindrical liner is connected to the heat medium inlet,
The manufacturing method of a compressor heat medium outlet of the accumulator is connected to the other end portion of the liner, the liner one
Copper tube whose outer diameter is slightly smaller than the inner diameter of the heat medium inlet
And one end thereof is inserted into the heat medium inlet at a predetermined position without press-fitting.
After inserting the pipe expansion jig into this liner,
The part inserted into the heat medium inlet from the inside in the radial direction
Press outward to expand diameter, press-connect liner to heat medium inlet
After that, pull out the expansion jig and attach it to the other end of the liner.
Insert the heat medium outlets of the heater and accumulator, and
The heat medium outlet of the accumulator, the other end of the liner, and the collar
Is joined by brazing .

According to the present invention, at the connection point between one end of the cylindrical liner and the heat medium inlet, one end of the liner is
The liner cylinder wall is pressed radially outward from the inside to expand the diameter, so that the liner is pressed against the peripheral wall surface of the heat medium inlet. There is no room to enter the room. In addition, since the liner is made of copper that can be easily and reliably brazed, it is not necessary to perform a process of previously applying a copper plating to a brazed portion of the liner.

Further , the present invention is applicable to a method for manufacturing a compressor according to the present invention.
The pipe expansion jig has an outer diameter approximately equal to the inner diameter at one end of the liner.
With a cylindrical body and can be inserted and retracted into the cylindrical body
And a circular cone at the top of the cylinder.
By forming slit-shaped cuts in multiple places
An elongated claw is formed, and the inner surface of the tip of the elongated claw is
The ring formed is expanded by the forward movement of the cone.
It is to be done .

[0011]

1 is a partially cutaway front view showing an embodiment of a compressor A according to the present invention, FIG. 2 is a cross-sectional view in which a main part of FIG. 1 is enlarged, and FIG. FIG. 4 is a perspective view of a tube expanding jig B shown in a sectional view.

A compressor A shown in FIG. 1 has an electric motor (not shown) and a compression element (not shown) disposed below the electric motor inside a cylindrical closed container 1. Are driven by an electric motor. The compression element is provided with a compression chamber (not shown), and a heat medium inlet 2 communicating with the compression chamber is provided in a casing 3 of the compression element. This casing 3 is made of a casting.

As shown in detail in FIG. 2, one end 41 of a cylindrical liner 4 is connected to the heat medium inlet 2 and the other end 42 of the liner 4 is connected to the heat medium outlet 5 of the accumulator 5.
1 are connected by being fitted inside. Further, the other end 42 of the liner 4 and the pipe 52
And the cylindrical collar 12 provided in the closed container 1 and externally fitted to the other end portion 42 of the liner 4 are joined by brazing. It is.

Here, the liner 4 is formed of a copper tube (which may be a copper tube). At the connection point between the one end 41 of the liner 4 and the heat medium inlet 2, the cylindrical wall of the one end 41 of the liner 4 inserted into the heat medium inlet 2 is radially outward from the inside as indicated by the arrow P. By pressing and expanding the diameter, it is pressed against the peripheral wall surface 21 of the heat medium inlet 2. Therefore, the outer diameter of the one end portion 41 of the liner 4 before the diameter expansion is slightly smaller than the inner diameter of the heat medium inlet 2.

When the one end 41 of the liner 4 is connected to the heat medium inlet 2 in this manner, a small piece generated by shaving off the surface of the liner 4 when the liner 4 is connected enters the compression chamber. There is no room for Also, since a copper tube is used for the liner 4, the other end 42 of the liner 4, the tube 52, and the collar 12
When brazing is easily and surely performed, it is not necessary to apply a copper plating to the brazing portion of the liner 4 in advance.

The pipe expanding jig B shown in FIG. 4 has a metal cylindrical body 71 and a cone 72 having a tapered tip portion 73. Has slit-shaped cuts 74 formed at a plurality of positions in the circumferential direction, and a plurality of elongated claw pieces 7 are provided between the cuts 74.
5 are formed. The diameter of the smallest diameter portion 73a of the tapered tip portion 73 of the cone 72 is slightly smaller than the diameter of the annular portion formed by the tip inner surfaces of the plurality of claw pieces 75, and The diameter 73b of the largest diameter portion of the tapered tip portion 73 of the cone 72 is larger than the diameter of the annular portion formed by the inner surfaces of the tip portions of the plurality of claw pieces 75.

FIG. 3 shows a state in which one end 41 of the liner 4 inserted into the heat medium inlet 2 is expanded by using the pipe expanding jig B. As shown in FIG.
In addition, a cylindrical body 71 having an outer diameter substantially equal to the inner diameter of one end of the liner 4 is inserted in a loose fit state so that the claw pieces 75 face the inner surface of the one end 41 of the liner 4, and A cone 72 is inserted into the body 71, and a tapered tip portion 73 of the cone 72 protrudes into an annular portion formed by inner surfaces of tip portions of the plurality of claw pieces 75. In this state, when the cone 72 is pressed and pushed in as indicated by an arrow X, the tip 73 of the cone 72 slides against the inner surfaces of the tips of the plurality of claws 75 and the claw 75
Press and expand. When the plurality of claw pieces 75 are pushed and spread in this way, the claw pieces 75 press the cylindrical wall of the one end 41 of the liner 4 from the inside to the radial outside as indicated by the arrow P described in FIG. The cylindrical wall expands in diameter and comes into pressure contact with the peripheral wall surface 21 of the heat medium inlet 2.

The joining strength and airtightness when the one end 41 of the liner 4 is connected to the heat medium inlet 2 in this manner are the same as those when the iron tube described at the beginning is press-fitted into the heat medium inlet and connected. Performance was secured.

When the one end 41 of the liner 4 is connected to the heat medium inlet 2 using the means described with reference to FIG. 3, the number and length of the claw pieces 75 provided on the cylindrical body 71 of the expansion jig B are determined. The position of the claw piece 75 in the axial direction with respect to the liner 4 during the pipe expanding operation, the pipe expansion allowance of the one end 41 of the liner 4, and the like can be freely changed as desired.

[0020]

As described above, the production of the compressor according to the present invention is described .
The manufacturing method is to adjust the outer diameter of one end of the liner to the inside of the heat medium inlet.
Formed into a slightly smaller diameter copper tube, one end of which is a heat medium inlet
After inserting the pipe expansion jig to the specified position without press-fitting
Part inserted into the liner and inserted into the heat medium inlet
Press the part from the inside to the outside in the radial direction to expand the
Press connection to the heat medium inlet, then pull out the expansion jig,
Heater outlet of collar and accumulator at the other end of inner
Insert the heat medium outlet of the accumulator and the liner
And the other end of the collar and the end of the collar
The liner as in the case of press-fit connection to the heat medium inlet.
It is not necessary to perform cutting work on the liner when press-fitting the liner.
Strips generated by scraping the surface of the liner invade the compression chamber.
No problem such as
Eliminates the hassle of copper plating
To reduce manufacturing costs and ensure compressor performance.
Can be increased. Further, manufacturing of the compressor according to the present invention
The pipe expansion jig used for the fabrication method is approximately the same as the inside diameter of one end of the liner.
A cylindrical body having the same outer diameter, and inserted into the cylindrical body
And a retractable cone.
Form slit-shaped cuts at multiple locations in the circumferential direction
To form an elongated claw, and the tip of this elongated claw is
The ring formed on the inner surface expands due to the forward movement of the cone
So that when the cone is inserted, it is elongated
By expanding the annular part formed on the inner surface of the tip of the nail piece
The liner can be reliably expanded and fixed, and expanded
The structure of the jig itself is simple and the operation is also pushing the cone
It's simple .

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing an embodiment of a compressor of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an explanatory view showing a connection procedure of a liner in a cross section.

FIG. 4 is a perspective view of a tube expanding jig.

[Explanation of symbols]

 A Compressor 1 Closed container 2 Heat medium inlet 4 Liner 5 Accumulator 6 Brazing point 21 Peripheral wall surface of heat medium inlet 41 One end of liner 42 Other end of liner 51 Heat medium outlet 52 Tube part

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F04B 39/12 101 F04C 29/00 F25B 43/00 B21D 39/06

Claims (2)

(57) [Claims] 1. A compression element disposed inside a closed container,
A heat medium inlet communicating with the compression chamber is formed, and one end of a cylindrical liner is connected to the heat medium inlet,
The manufacturing method of a compressor heat medium outlet of the accumulator is connected to the other end portion of the liner, the liner one
Copper tube whose outer diameter is slightly smaller than the inner diameter of the heat medium inlet
And one end thereof is inserted into the heat medium inlet at a predetermined position without press-fitting.
After inserting the pipe expansion jig into this liner,
The part inserted into the heat medium inlet from the inside in the radial direction
Press outward to expand diameter, press-connect liner to heat medium inlet
After that, pull out the expansion jig and attach it to the other end of the liner.
Insert the heat medium outlets of the heater and accumulator, and
The heat medium outlet of the accumulator, the other end of the liner, and the collar
And an end portion of the compressor, characterized by brazing the
Manufacturing method . 2. An expansion pipe used in the method for manufacturing a compressor according to claim 1.
A jig having an outer diameter substantially equal to the inner diameter of one end of the liner;
Cylindrical body having a diameter and can be inserted and retracted into and out of the cylindrical body
And the top of the cylindrical body
By forming slit-shaped cuts at multiple locations
An elongated nail piece is formed, and the inner surface of the tip of the elongated nail piece is formed.
The ring formed by the above is expanded by the forward movement of the cone.
A pipe expanding jig characterized by being performed .