JP2000027757A - Hermetic terminal for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic terminal for compressor capable of securing the insulating strength between connecting terminals of a hermetic terminal without lowering the pressure resistance of a sealed container of the compressor. SOLUTION: A flat surface 2 is provided in an upper part of an outer surface of a cylindrical sealed container 1 forming a case of a sealed compressor. Holes for insertion of plural connecting terminals 5a, 5b, 5c of hermetic terminal are directly drilled in the sealed container 1 at positions close to a rod 6 provided in the flat surface 2 while projecting therefrom. The plural connecting terminals 5a-5c of the hermetic terminal are inserted for sealing in the condition that a part thereof is embedded and other parts thereof are projected out of the flat surface 2. A terminal cover 3 is made of an electrically insulating material such as rubber, and provided with a terminal chamber for housing the connecting terminals 5a-5c of the hermetic terminal. A drawing port 8 for drawing a lead wire connected to a terminal of an overload relay and a lead wire connected to the connecting terminal is formed in a lower end of the terminal cover 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic terminal of a compressor using a flammable refrigerant such as a hydrocarbon (HC) refrigerant.

[0002]

2. Description of the Related Art As a power terminal of a compressor, a commercially available hermetic terminal is prepared. For example, in a vertical compressor, a hermetic terminal hermetically mounted in a fitting hole at the top of a compressor container is known. I have. FIG. 4 shows an example.

[0003] In Fig. 4, reference numeral 1 denotes a cylindrical hermetic container forming an outer cover of a hermetic compressor, and a flat surface 2 is provided on an upper portion of an outer surface of the container. Reference numeral 6 denotes a rod provided on the flat surface 2 of the closed container 1 so as to protrude therefrom. Reference numeral 5 denotes a sealed terminal which embeds a part of the closed container 1 close to the rod and protrudes the other part outside the flat surface 2. The hermetic terminal is provided with a plurality of hermetic terminal connection terminals 5a, 5b, 5c protruding therefrom.

[0004] Reference numeral 3 denotes a terminal cover provided with a terminal chamber 31 for accommodating the sealed terminal 5, and this terminal cover is formed of an electrically insulating material such as rubber or plastic. A hole formed in the 32 terminal cover 3 and penetrating in the vertical direction. The inner diameter is slightly larger than the outer diameter of the rod 6. Reference numeral 33 denotes a protector chamber formed integrally with the terminal cover 3 to house an overload relay (not shown). A lower end of the protector chamber holds the overload relay so as to be in close contact with the outer surface of the sealed container 1. A part 9 is provided.

Reference numeral 7 denotes a discharge port of the compressor, 8 denotes an outlet through which a lead wire connected to a terminal of the overload relay or a lead wire connected to the connection terminals 5a, 5b, 5c of the sealed terminal 5 is drawn. Is formed at the lower end. 4 is the terminal cover-3 and the sealed container 1
Numeral 61 denotes a nut which passes through the hole 41 of the gasket 4 and is screwed to the rod 6.

In this structure, the hole 41 of the gasket 4
And the hole 32 of the terminal cover 3 is inserted into the rod 6, and the terminal cover 3 is tightened with the nut 62, so that the terminal cover is air-tightly fixed to the sealed container 1, and no moisture or the like enters the terminal cover 3. That is what it is. On the flat surface 2 of the closed container 1,
The sealing terminal 5, which is a connection terminal of the hermetic terminal shown in FIG. 5B, is inserted and sealed in the hole 51 shown in the front view of FIG. 5A.

[0007]

When a hydrocarbon (HC) refrigerant or the like is used in a hermetic compressor, during operation, conductive sludge precipitates and adheres to the connection terminal of the hermetic terminal, and gradually decreases. There is a possibility that the dielectric strength between them will be reduced and eventually short-circuit will occur. There is a danger of explosion due to spark ignition due to short-circuiting of some refrigerants, and such a situation must be avoided at all costs.

In a rotary compressor, in particular, since the pressure inside the closed vessel 1 is high, the pressure resistance of the closed vessel 1 must be as high as possible. Drilling a hole 51 corresponding to the sealed terminal of a commercially available hermetic terminal in 2 was disadvantageous in terms of strength against pressure.

Accordingly, an object of the present invention is to provide a hermetic terminal of a compressor which ensures the dielectric strength between the connection terminals of the hermetic terminal and does not reduce the pressure resistance of the hermetic container of the compressor.

[0010]

According to a first aspect of the present invention, there is provided a hermetic terminal for a compressor, comprising a plurality of holes formed on an outer surface of a cylindrical hermetic container forming a casing of the compressor. The connection terminal of the hermetic terminal was hermetically inserted into each of the holes.

According to a second aspect of the present invention, there is provided a hermetic terminal for a compressor, wherein a plurality of holes are arranged in the outer surface of a cylindrical hermetic container forming an outer casing of the compressor so as to be arranged at vertices of an equilateral triangle. The connection terminals of the hermetic terminal are hermetically inserted into the respective holes.

According to a third aspect of the present invention, there is provided a hermetic terminal for a compressor, wherein a plurality of holes are linearly arranged at equal intervals on an outer surface of a cylindrical hermetic container forming a casing of the compressor. The connection terminals of the hermetic terminal are hermetically inserted into the respective holes.

In this way, it is possible to obtain a compressor hermetic terminal which ensures the dielectric strength between the connection terminals of the hermetic terminal and does not reduce the pressure resistance of the hermetically sealed container of the compressor.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments with reference to the drawings. FIG. 1 shows a hermetic terminal of the compressor of the present invention. In FIG. 1, the same components as those in FIG. 4 are denoted by the same reference numerals.

In FIG. 1, reference numeral 1 denotes a cylindrical hermetic container forming an outer cover of a hermetic compressor, and a flat surface 2 is provided on an upper outer surface of the container. Reference numeral 6 denotes a rod provided on the flat surface 2 of the closed container 1 so as to protrude therefrom.
The other portions protrude outside the flat surface 2 and are provided with a plurality of connection terminals 5a, 5b, and 5c for hermetic terminals.

Reference numeral 3 denotes a terminal cover formed of an electrically insulating material such as rubber or plastic and provided with a terminal chamber 31 for accommodating the connection terminals of the hermetic terminals. The terminal cover 3 is made of an electrically insulating material such as rubber. Made of material. A hole formed in the 32 terminal cover 3 and penetrating in the vertical direction. The inner diameter is slightly larger than the outer shape of the rod 6. Reference numeral 33 denotes a protector chamber formed integrally with the terminal cover 3 to house an overload relay (not shown). A lower end of the protector chamber holds the overload relay so as to be in close contact with the outer surface of the sealed container 1. A part 9 is provided.

7 is a discharge port of the compressor, 8 is a lead wire or connection terminal 5 connected to a terminal of the overload relay.
These are outlets for extracting lead wires connected to the terminals a, 5b, and 5c, and are formed at the lower end of the terminal cover 3. Reference numeral 4 denotes a gasket interposed between the terminal cover-3 and the sealed container 1, and 61 denotes a nut that passes through the hole 41 of the gasket 4 and is screwed to the rod 6.

The conventional example shown in FIG. 4 is provided with a sealed terminal 5 in which a plurality of connection terminals are hermetically inserted on the flat surface 2 on the upper surface of the outer surface of the sealed container 1, whereas the embodiment of the present invention shown in FIG. In the example, the connection terminals 5a, 5b, and 5c protrude outside the flat surface 2 and directly connect to a plurality of hermetic terminals.
Is provided. That is, the connection terminals 5a, 5b, 5 of the plurality of hermetic terminals are directly provided on the flat surface 2.
A hole for sealingly inserting c is formed.

FIG. 2 (A) shows a flat surface 2 of a closed container 1.
FIG. 2B shows a state in which a plurality of holes are arranged and drilled so as to form the vertices of an equilateral triangle, and as shown in FIG. At this time, the distance between the connection terminals is set as large as possible.

FIG. 3 (A) shows a flat surface 2 of a closed container 1.
FIG. 3B shows a state in which a plurality of holes are arranged and drilled at equal intervals on a straight line, and as shown in FIG. Insert and seal. At this time, the distance between the connection terminals can be set relatively large.

In this embodiment, an example is described in which the hermetic terminal is mounted on the upper flat surface of the outer surface of the closed container. However, the hermetic terminal may be mounted on the side surface of the closed container.

[0022]

As described above, according to the present invention, holes for sealingly inserting the connection terminals of a plurality of hermetic terminals are formed directly on the flat surface of the sealed container of the compressor so as to increase the distance between the connection terminals. The hermetic terminal connection terminals are hermetically inserted into each hole, ensuring dielectric strength between the hermetic terminal connection terminals.
In addition, it is possible to obtain a compressor hermetic terminal that does not reduce the pressure resistance of the sealed container of the compressor.

[Brief description of the drawings]

FIG. 1 is a hermetic terminal of the compressor of the present invention.

FIG. 2 is an embodiment of a hermetic terminal of the present invention.

FIG. 3 shows another embodiment of the hermetic terminal of the present invention.

FIG. 4 is a hermetic terminal of a conventional compressor.

FIG. 5 is a conventional hermetic terminal.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical airtight container which forms the envelope of a compressor 2 Flat surface of the upper part of the outer surface of a container 3 Terminal cover 4 Gasket 5 Sealing terminal 5a-5c Hermetic terminal connection terminal 6 Rod 7 Discharge port 8 Lead wire outlet 31 Terminal Chamber 32 Terminal cover hole 33 Protector chamber 61 Nut

Claims (3)

[Claims] 1. A compressor comprising a plurality of holes formed in an outer surface of a cylindrical hermetic container forming an outer casing of a compressor, and a connection terminal of a hermetic terminal being hermetically inserted into each of the holes. Hermetic terminal. 2. The hermetic terminal of a compressor according to claim 1, wherein the plurality of holes are arranged and formed so as to be vertices of an equilateral triangle. 3. The hermetic terminal of a compressor according to claim 1, wherein the plurality of holes are arranged and formed at equal intervals on a straight line.