JPH05256261A - Closed type electric motor-driven compressor - Google Patents

Abstract

PURPOSE:To perform assembly easily and at low cost while preventing a spark and a short-circuit due to metal powder floated in lubricating oil in a closed jacket, by sealing a connection part between lead wires of an electric motor and conductive pins of a glass terminal with a heat shrinkage insulating casing. CONSTITUTION:A glass terminal 5 comprising conductive pins 6, substrate 7 and a glass sealed hole part 8 is closely fixed to a through hole of a sealed jacket 1. On the other hand, connecting spring terminals 12 coated with heat shrinkage insulating jackets 11 are arranged in an opposite motor side point end in lead wires 9 of an electric motor. In the case of fixedly press-fitting the conductive pins 6 to the connecting spring terminals 12, the heat shrinkage insulating jackets 11 are positioned so as to closely adhere to the glass sealed part 8. Thus in the case of heating the terminal part 5 or an electric motor- driven compressor total unit, the heat shrinkage insulating jacket 11 is contracted, thus to completely seal a connection part insulated between the connecting spring terminal 12 and the conductive pin 6. A spark and a short- circuit due to metal powder or the like, floated in lubricating oil in the sealed jacket 1, are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small hermetic electric compressor used in a domestic refrigerator.

[0002]

2. Description of the Related Art In recent years, various improvements have been made in hermetic electric compressors in pursuit of higher reliability and long-term durability. The glass terminal for power supply and the lead wire spring terminal of the electric motor are connected. Partial insulation is also one of the major issues.

Hereinafter, an example of a glass terminal connecting portion of a conventional hermetic electric compressor will be described with reference to the drawings.
3 and 4 are a cross-sectional view of a hermetic electric compressor and a cross-sectional view of a main part. The compression element 2 and the electric motor 3 are housed inside the closed casing 1, and the electric motor 3 is press-fitted and connected to the conductive pin 6 of the glass terminal 5 via the lead wire 4. The glass terminal 5 includes a conductive pin 6, a substrate 7 and a glass sealing portion 8, and is hermetically fixed in the through hole of the hermetic casing 1. On the other hand, at the tip of the lead wire 4 opposite to the motor side, the connection spring terminal 1 inserted in the cluster 9 is inserted.
0, and is press-fitted and fixed to the conductive pin through the through hole of the cluster 9.

In the hermetic electric compressor configured as described above, from the outside of the hermetic casing 1 through the conductive pin 6, the connection spring terminal 10 and the lead wire 4,
A rated voltage is applied to the electric motor 3 to drive the compression element 2 to suck and compress the working refrigerant.

[0005]

However, in the above structure, the conductive pin and the connection spring terminal 10 are connected.
Of the iron powder, copper powder, which is not insulated from the other adjacent press-fitting connection parts and the lubricating oil 13 enclosed in the hermetically sealed casing 1, and which floats in the lubricating oil 11. There is a possibility that sparks and electric leakage may occur between the conductive pins 6 due to a small amount of water or the like, and an accident such as breakage of the glass terminal 5 may occur.

In view of the above problems, the present invention provides a hermetic electric compressor which completely insulates and hermetically seals the connection portion between the conductive pin and the connection spring terminal and has an easy and inexpensive assembly property.

[0007]

In order to solve the above problems, in the hermetic electric compressor of the present invention, the connection spring terminal of the lead wire is covered with a heat-shrinkable insulating jacket, and the connection spring terminal is The heat-shrinkable jacket insulates and seals the connecting portion between the conductive pin and the connecting spring terminal by heating after pressing and fixing the conductive pin.

[0008]

With the above structure, the present invention completely prevents the spark and the electric leakage caused by the metal powder floating in the lubricating oil in the hermetically sealed casing by completely insulating and sealing the connecting portion of the conductive pin and at a low cost. And easy assembly can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic electric compressor according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. Figure 1
FIG. 2 is a cross-sectional view of a main part of a glass terminal and a lead wire connection spring terminal according to an embodiment of the present invention, and FIG.

In FIGS. 1 and 2, a glass terminal 5 including a conductive pin 6, a substrate 7 and a glass sealing portion 8 is hermetically fixed in a through hole of a hermetic casing 1.

On the other hand, the lead wire 4 of the electric motor 3 has a connection spring terminal 12 covered with a heat-shrinkable insulating jacket 11 at the tip opposite to the motor side, and the connection spring terminal 12 is press-fitted and fixed to the conductive pin 6. The heat-shrinkable insulating jacket 11
Is positioned so as to be in close contact with the glass sealing portion 8, and when the terminal portion 5 or the entire hermetic electric compressor is heated, the heat-shrinkable insulating jacket 11 shrinks and the connection spring terminal 12 and , The connecting portion 6a of the conductive pin 6 is completely insulated and sealed.

In the hermetic electric compressor constructed as described above, the connecting portion 6a between the conductive pin 6 and the connecting spring terminal 12 is formed.
Is easily and completely hermetically connected, so that the metal powder and a small amount of water present in the lubricating oil 13 in the hermetically sealed casing 1 do not enter the connecting portion 6a, and the terminal portion is damaged by sparking and electric leakage. It is possible to prevent such accidents.

[0013]

As described above, according to the present invention, by sealing the connecting portion of the electric motor and the glass terminal with the heat-shrinkable insulating jacket, the metal powder and the trace amount of water floating in the lubricating oil in the sealed jacket are sealed. However, it does not invade the connection part and prevents accidents such as electric leakage and damage to the terminal part due to sparks.
It is cheap and easy to assemble.

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view of a terminal portion of a hermetic electric compressor and a motor lead wire connection spring terminal according to an embodiment of the present invention before assembly.

FIG. 2 is a cross-sectional view after assembly of FIG.

FIG. 3 is a sectional view of a conventional hermetic electric compressor.

FIG. 4 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 1 Sealed Jacket 2 Motor Lead Wire 5 Glass Terminal 6 Conductive Pin 6a Conductive Pin Connection Part 11 Heat Shrinkable Insulation Jacket 12 Connection Spring Terminal

Claims (1)

[Claims] 1. A hermetically-sealed casing having a compression element and an electric motor housed therein, and a power-supplying glass terminal that is fixed to a part of the hermetically-sealed casing by penetrating the same in advance. , A substrate, a glass sealing part, and a conductive pin, the electric motor includes a lead wire connected to the conductive pin, and a tip end of the lead wire on the side opposite to the motor is covered with a heat-shrinkable insulating jacket. A hermetic electric compressor having a connection spring terminal, wherein the heat-shrinkable insulating jacket insulates and seals the connection spring terminal and a connection portion of a conductive pin.