Electric heating – Metal heating – By arc
Reexamination Certificate
2001-11-21
2003-08-05
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S125110
Reexamination Certificate
active
06603096
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a welding apparatus and a method thereof for a hermetic compressor, and in particular to a welding apparatus and a method thereof for a hermetic compressor which are capable of decreasing a welding time and improving a welding quality.
2. Description of the Prior Art
FIG. 1
is a longitudinal sectional view illustrating a general hermetic compressor.
The general hermetic compressor includes a casing
11
, a compressing unit
31
placed inside the casing
11
and compressing a refrigerant, and a driving unit
41
installed at the upper portion of the compressing unit
31
and operating the compression unit
31
.
The driving unit
41
includes a stator
43
fixed at the inner circumference of the casing
11
and connected to a power source, a rotor
45
installed rotatable inside the stator
43
, and a rotation shaft
47
fixed at the center of the stator
43
and transmitting a rotation force of the rotor
45
to the driving unit
41
.
The compressing unit
31
includes a cylinder
33
forming a compressing chamber
49
in which the refrigerant is sucked and compressed, and a roller
35
fixed at the rotation shaft
47
, placed inside the cylinder
33
so as to be eccentric and compressing the refrigerant while rotating inside the cylinder
33
.
The casing
11
has a cylinder shape opened up and down, a suction pipe
13
sucking the refrigerant into the compressing chamber
49
is installed at the lower portion of the casing
11
, and an upper cap
17
and a lower cap
15
are respectively combined at the opened upper and lower portions of the casing
11
in order to seal up the casing
11
.
A discharge pipe
19
is installed at the upper cap
17
in order to discharge the refrigerant, and a plurality of power terminals
21
are installed at a certain portion of the upper cap
17
in order to supply power to the driving unit
41
.
The plurality of power terminals
21
are supported by the upper cap
17
through a terminal supporting member
23
and surrounded by an insulating tube
25
so as to penetrate the terminal supporting member
23
. And, the power terminal
21
is electrically connected to the stator
43
inside the casing
11
by a lead wire
27
Herein, the terminal supporting member
23
is made of a metal material, and the insulating tube
25
is made of a glass material for insulation.
In the meantime, the upper cap
17
and the lower cap
15
are permanently combined to the casing
11
by welding in order to prevent leakage of the refrigerant from the compressing unit
31
.
In a method and an apparatus for welding the upper cap
17
and the lower cap
15
to the casing
11
, a MIG (metal inert gas) welding apparatus or a MAG (metal active gas) welding apparatus generating and welding arc by continuously supplying an electrode wire and using argon (A) gas or argon+helium (He) gas as an inert gas for protecting the arc is used.
FIG. 2
is a front view illustrating an arrangement of a welding torch of a welding apparatus of the conventional hermetic compressor.
In the conventional welding apparatus, a first welding torch
101
and a second welding torch
103
are placed at the circumference region of the casing
11
so as to be corresponded each other in the radius direction about the center of the casing
11
and a driving unit (not shown) rotating the casing
11
or the welding torches
101
,
103
in welding.
In the conventional welding apparatus, an upper cap
17
and a lower cap
15
are respectively inserted into the upper and lower portions of the casing
11
, the first and the second welding torches
101
,
103
are at 180 degrees at the circumference of the casing
11
so as to be faced each other, when the driving unit is operated, the casing
11
or the welding torches
101
,
103
is/are rotated, accordingly the electric welding can be performed through the first welding torch
101
and the second welding torch
103
.
However, in the above-mentioned conventional welding apparatus, because the welding is performed by the two welding torches, the casing or the welding torch has to rotate in a 180-degrees arc at least, the welding time is increased, accordingly a productivity is lowered.
When a welding apparatus includes not less than three welding torches, heat generated in welding is excessively transmitted to the insulating tube through the upper cap and the insulation supporting member, accordingly crack can be occurred in the insulating tube as the glass material.
In addition, when welding stress occurs by the variation of a current and a voltage applied to each welding torch due to characteristics of the electric welding, because an additional means for coping with the situation is not included, accordingly lots of errors can occur.
SUMMARY OF THE INVENTION
In order to solve above-mentioned problems, it is an object of the present invention to provide a welding apparatus and a method thereof for a hermetic compressor which are capable of decreasing shapely a welding time and improving a productivity by installing not less than three welding torches.
In addition, it is another object of the present invention to provide a welding apparatus and a method thereof for a hermetic compressor which are capable of minimizing an error rate by lowering transmittance of heat generated in a welding torch to a power terminal by controlling the welding torch so as to pass the power terminal only one time.
In order to achieve the above-mentioned objects, a welding apparatus for a hermetic compressor includes a plurality of welding torches placed at the circumference of a casing at regular intervals, a driving unit rotating the casing or the welding torches and a control means controlling a current and a voltage applied to the welding torches according to welding conditions and the driving unit.
The hermetic compressor further includes a display unit displaying information about a detection result of the current and the voltage supplied to the welding torch and information about the welding state in real time.
The welding apparatus for the hermetic compressor includes three welding torches respectively placed at 180 degrees at the circumference of the casing
11
in which an upper cap is inserted.
Two of the three welding torches placed at both sides of a power terminal of the upper cap are installed at 60 degrees from the center of the power terminal.
The welding apparatus for the hermetic compressor includes four welding torches placed at 90 degrees at the circumference of the casing.
The driving unit rotates the welding torches or the casing.
The control means includes a power supply unit applying power to each welding torch, a current and voltage detecting unit detecting a current and a voltage applied to each welding torch, a welding condition setting unit setting a welding condition by including an upper limit of the current and the voltage applied to each welding torch, a heat input outputting unit outputting a heat input transmitted to the upper cap with the detecting result of the current and voltage detecting unit, and a control unit controlling the welding torch and the driving unit according to an electric signal of the heat input outputting unit and an electric signal applied from the welding condition wetting unit.
In order to achieve the above-mentioned object, a welding method for a hermetic compressor in accordance with the present invention includes a first step for setting a welding condition according to characteristics of a hermetic compressor and loading a casing having an inserted upper cap to a welding position, a second step for starting a welding by applying power to a welding torch, operating a driving unit and rotating the welding torch or the casing at a fixed speed when the casing is loaded to the welding position, a third step for detecting a current and a voltage applied to the welding torch and outputting a heat input transmitted from the welding torch to the upper cap in accordance with the detected electric signal when the welding is started in
Lee In Gi
Lee Sun Han
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
Shaw Clifford C.
LandOfFree
Welding apparatus and method thereof for hermetic compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Welding apparatus and method thereof for hermetic compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Welding apparatus and method thereof for hermetic compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3117343