JPH073223B2 - Hermetic compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly to a compressor suitable for suppressing the amount of spatter generated in the sealing welding of a steel plate hermetic container.

[Conventional technology]

FIG. 5 shows an example of the structure of the compressor. Reference numeral 1 denotes a compressor body, which is composed of a cylinder 1a, the above bearing 1b, a lower bearing 1c, a roller 1d, a crankshaft 1e, etc.
The rotor of the electric motor 1f is joined to the upper extension of the crankshaft 1e. 2 is a closed container, and the closed container 2
Is mainly composed of a cylindrical case 2a, and a lid-like upper chamber 2b and a lower chamber 2c are press-fitted and joined to the upper and lower sides of the case 2a, and then the respective welded portions 2d are sealed and welded to each other, and the compressor body 1
Is a structure in which the closed container 2 is housed in the closed container 2.

The sealing welding of the cylindrical container and the lid of the compressor is performed by press-fitting the lid into the container, and using the MAG method or the like for the power supply in this press-fitting section, and using the filler wire to be supplied as an electrode, a so-called loose consumption type. Overflow welding of the press-fitted portion is mainly used by the electrode.

After manufacturing the case 2a by rounding a steel plate and joining a part of the overlap by resistance welding, perfect inner diameter accuracy was not obtained at that time, and a step 2e was generated as shown in FIG. The stepped portion 2e remains as the gap 3 in the state where the lower chambers 2b and 2c are press-fitted. Further, as shown in FIG. 7, during the sealing welding, the welding heat causes a gap 3 due to thermal expansion between the case 2a and the chambers 2b, 2c in the forward direction of the welding bead 4. In these gaps, in the welding using the conventional consumable electrode using the MAG power source as shown in FIG. 8, the spatter 6 caused by the droplets of the filler wire 5 is scattered as shown by the arrow. , A part of the approach to the inside of the compressor.

[Problems to be solved by the invention]

The above-mentioned conventional technology, a minute gap generated in the press-fitting portion due to heat during welding, or a gap generated from plastic deformation of the closed container itself may cause spatter during welding to enter the closed container. Has a problem that there is a high possibility of causing a lock or the like.

It is an object of the present invention to provide a method for welding a hermetically sealed container for a compressor, in which the generation of spatter that causes biting, locking, etc. of the sliding portion of the compression mechanism is greatly reduced.

[Means for solving problems]

The above-mentioned object consists of a cylindrical body made of a steel plate plastically worked body and a lid body press-fitted into the cylindrical body, and the cylindrical body and the lid body are welded by using a non-consumable lid body and a filler wire. It is achieved by having a part.

[Action]

The welding method, which mainly uses welding with non-consumable electrodes, melts the base material and the filler wire that are close to each other by press-fitting, etc., and causes them to flow to an appropriate place for sealing welding. Unlike the conventional welding with consumable electrodes, the parts do not generate droplets, and it is possible to suppress the generation of droplets due to the collision of the droplets. Therefore, it is possible to prevent the intrusion into the compressor from the slight gap existing in the welded part of spatter or the gap generated by thermal expansion during welding. It becomes possible to solve the problem of impairing reliability.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4.

Reference numeral 11 denotes a case having a built-in compressor body, 12 denotes an upper or lower chamber press-fitted and joined to the case 11, and a hermetic compressor 10 constituted by these is a substantially horizontal welding machine (not shown).
It is held by the chuck 13. 14 is a torch with a built-in non-consumable electrode such as a plasma power supply. The torch is supported by the end surface 11a of the case 11 at an arbitrary angle θ, an arbitrary distance W and arbitrary aiming positions α, β, γ.

As described above, after the compressor 10 and the torch 14 are set at appropriate relative positions, sealing welding is performed using appropriate welding specifications.

FIG. 3 shows a sectional view of the essential parts of a compressor equipped with the present invention.
The broken lines show the shapes of the case 11 and the chamber 12 before welding.
That is, the base material of the intersection line portion of the case is melted by heating by the arc 15 generated from the torch, and while the melted portion forms the molten pool 16, a part of the chamber 12 is melted and brought into a co-attached state. Further, by inserting the filler 17 into the co-melting molten pool 16 thus formed, the weld bead is overlaid by the filler, so that the same welding strength as the conventional one can be obtained.

FIG. 4 is a micrograph showing the cross-sectional structure of the welded portion of the compressor of the present invention.

〔The invention's effect〕

According to the filler-equipped co-welding using the non-consumable electrode according to the present invention, the generation of spatter due to the droplets generated by the conventional consumable electrode using the filler wire and the droplets generated by the collision of the droplets is almost eliminated. Since it is not seen, there is no spatter that enters the inside of the compressor through the gap generated by the case accuracy and the welding heat, and it is possible to obtain a very good welded seal of the closed container. Therefore, the compressor according to the present invention can eliminate the factors that impede the operational reliability of the sliding portion due to the combination of high precision parts such as biting, lock accident, wear due to oil film breakage, etc., in combination with spatter intrusion, so that high quality is achieved. There is an effect that a fully enclosed compressor can be obtained.

[Brief description of drawings]

FIG. 1 is a top view of a compressor equipped with the present invention, FIG. 2 is a side view of the essential parts of a compressor equipped with the present invention, and FIG. 3 is a sectional view of the essential parts of a compressor equipped with the present invention. FIG. 4 is a micrograph showing the cross-sectional structure of the welded portion of the compressor of the present invention, FIG. 5 is a longitudinal sectional view of a conventional compressor, FIG. 6 is a top view of FIG. 5, and FIG. FIG. 8 is a sectional view of an essential part of a container used in the compressor, and FIG. 8 is a sectional view of an essential part of a conventional compressor. 10 ... Fully enclosed compressor, 11 ... Case, 11a ... Case end face, 12 ... Upper or lower chamber, 13 ... Welder chuck, 14 ... Torch, 15 ... Arc, 16 ... Melting Pool, 17 ... Filler wire, 18 ... Weld bead, θ,
α, β, γ ... Aim of torch, W ... Distance between torch and weld.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Watanabe 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Tochigi Plant, Hitachi Ltd. (56) Reference JP-A-63-71584 (JP, A)

Claims (1)

[Claims] 1. A welded body comprising a cylindrical body made of a plastically worked steel plate and a cover body press-fitted into the cylindrical body, wherein the cylindrical body and the cover body are formed by using non-consumable electrodes and filler wires. A hermetic compressor having a portion.