JPH0481581A - Enclosed motor compressor - Google Patents

Abstract

PURPOSE:To prevent any insulation failure in a conductive pin connecting part by covering the connecting part between a conductive pin and a lead wire and an insulating member with insulable resin with heat resistance, and making this resin stick fast to an inner surface of a metallic outer ring. CONSTITUTION:A feeding terminal 3 is installed in an opening 2 installed in a part of a hermetically sealed vessel 1. This feeding terminal 3 is provided with a metallic outer ring 6 being fitted in the opening 2 and a conductive pin being supported by this metallic outer ring 6 via a glass sealing part 5, and connected to a lead wire 9 out of an inner part of the hermetically sealed vessel 1. Here, a connecting part between the conductive pin 4 and the lead wire 9 and the glass sealing part 5 are covered with heat resisting insulating rubber 11. Then, this insulating rubber 11 is stuck close to an inner surface of the metallic outer ring 6. With this constitution, any possible insulating failure in the connecting part 4a of the conductive pin 4 is thus preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hermetic electric compressor that prevents poor insulation at terminals inside a hermetic container.

BACKGROUND OF THE INVENTION In recent years, with the regulation of the use of fluorocarbon gas used as a refrigerant gas in hermetic electric compressors, R-134a, R=152a, etc. are considered promising as alternative refrigerant gases. However, among these alternative refrigerant scum, when the compression, expansion, and condensation processes are repeated in a mixed state with refrigerating machine oil, water molecules may eventually be liberated from the refrigerant gas and generated. If these water molecules adhere to the power supply member of the power supply terminal to which voltage is applied, a short circuit current may flow, causing many dangers.

An example of a conventional hermetic electric compressor will be described below with reference to the drawings.

FIG. 2 shows a sectional view of a power supply terminal of a conventional hermetic electric compressor.
A power supply terminal 3 is provided.

This power supply terminal 3 has a conductive pin 4 inserted therethrough and held therein corresponding to each lead wire provided in the sealed container 1, and each conductive pin 4 is connected to a metal outer ring 6 through a glass sealing hole 5. As a result of being supported in the hole 7, the conductive pins 4 are electrically insulated from each other. The metal outer ring 6 is supported while being fitted into the opening 2 of the airtight container 1, and an insulation deterioration prevention plate 8 is in contact with the periphery of the metal outer ring 6 from the inside of the airtight container 1. It is provided. The insulation deterioration prevention plate 8 is made of flame-retardant resin, and metal powder and foreign matter generated from the sliding parts of the electric compressor, such as bearings and connecting rods, are prevented from coming into contact with the insulation deterioration prevention plate 8 and the metal outer ring 6. This prevents intrusion into the space.

Problems to be Solved by the Invention However, in the conventional configuration as described above, the conductive pin 4 and the glass sealing part 5 of macromolecules such as the metal powder and foreign matter
Can refrigerant gas molecules and refrigerating machine oil molecules easily penetrate, causing leakage current to flow due to deterioration of the insulation between the conductive bottles 4 and deterioration of the surface insulation of the glass sealing part 5? This had the disadvantage that the glass holding the pin 4 melted and the power supply terminal was destroyed.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a sealed electric pressure machine that prevents insulation failure at the conductive pin connection portion.

Means for Solving the Problem In order to solve this problem, the closed type electric compressor of the present invention is provided with an opening in a part of the closed container that seals and stores the electric motor and the compression means driven by the motor. , a power supply terminal for supplying power to the electric motor is provided in the opening, and the power supply terminal includes a metal outer ring that fits into the opening;
A plurality of conductive pins are supported by the metal outer ring via an insulating member and connected to lead wires from inside the sealed container, and a connection portion between the plurality of conductive pins and the lead wire and the insulating member are provided. It is characterized in that it is integrally covered with a heat-resistant insulating resin, and this resin is brought into close contact with the inner surface of the metal outer ring.

Function: With this configuration, the periphery of the connecting part where the conductive pin and the lead wire are combined is sealed with a heat-resistant and insulating resin, and the M resin is brought into close contact with the inner surface of the metal outer ring. The contact part is insulated and sealed to isolate the conductive pin connection part from metal powder generated from motor bearings, pressurized stoves, etc., and trace moisture in refrigerating machine oil. Accidents such as terminal damage can be prevented.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIG. In the drawings, the same reference numerals as in the conventional example indicate the same members, and detailed explanation thereof will be omitted. A connecting spring terminal 10 is attached to the tip of each lead wire 9 drawn out from an electric motor for driving the compression means (not shown in FIG. 1), and each connecting spring terminal 10 is connected to a conductive pin connecting portion 4a.

The conductive pin 4 is insulated and held in the hole 7 of the metal outer ring 6 via the glass seal 5 as in the conventional example, and is connected to an external power source to supply power to the electric motor. Reference numeral 11 denotes a heat-resistant insulating rubber 11 that integrally covers the # branch portions of each of the plurality of lead wires 9 and the connection spring terminal 10 and the connection portion between the connection spring terminal 10 and the conductive pin 4, and It is provided so as to be in close contact with the inner surface.

With this configuration, the power supply terminal portion including the connecting portion between the lead wire 9 and the conductive pin 4 located inside the hermetic container 1 and the glass sealing hole 5 is connected to the trace amount of water contained in the refrigerating machine oil present inside the hermetic container 1. As a result, it is possible to prevent accidents such as damage to the terminal portion due to poor insulation between the conductive bottles 4 and sparks.

Note that the materials constituting the power supply terminal 3 for the purpose described above do not need to be limited to the materials described in the above embodiments, and the conductive pins 4 in the holes 7 of the metal outer ring 6 may be sealed with glass sealing material. However, other insulating members may be used.
In addition, although the heat-resistant insulating rubber 11 was used as the member for sealing the periphery of the connecting portion between the conductive pin 4 and the lead wire 9, other I! Fat may also be used.

Effects of the Invention As described above, according to the present invention, in a power supply terminal for a hermetically sealed electric compressor equipped with a power generator and a compression means, heat resistance and insulation are provided around the connecting portion where the conductive pin and the lead wire are connected. By sealing with a resin that holds the resin and tightly adhering the resin to the inner surface of the metal outer ring, the connection between the lead wire and the conductive pin is insulated and sealed, preventing metal powder and refrigerating machine oil generated from motor bearings, compressor connecting rods, etc. It is possible to isolate the conductive pin connection part from trace amounts of moisture inside, and prevent accidents such as poor insulation between the conductive pins and damage to the terminal part due to sparks.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a power supply terminal for a hermetic electric compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional power supply terminal. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Opening part, 3... Power supply terminal, 4... Conductive pin, 5... Glass sealing part,
6... Metal outer ring, 9... Lead wire, 10... Connection spring terminal, 11... Heat resistant insulating rubber. Agent Yoshihiro Morimoto # Telephone/Picture 2 Figure 1

Claims (1)

[Claims] 1. An opening is provided in a part of an airtight container that seals and stores an electric motor and a compression means driven by the electric motor, and a power supply terminal for supplying power to the electric motor is provided in this opening, and this power supply terminal is connected to the opening. a metal outer ring that fits into the metal outer ring, and a plurality of conductive pins supported by the metal outer ring via an insulating member and connected to a lead wire from inside the sealed container, the plurality of conductive pins and the lead wire. A hermetic electric compressor comprising integrally covering the connecting portion with the insulating member and the insulating member with a heat-resistant insulating resin, and bringing the resin into close contact with the inner surface of the metal outer ring.