JP3130738B2 - Terminal box structure of hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor,
In particular, it relates to a terminal box structure mounted on the outer surface of the shell.

[0002]

2. Description of the Related Art In a hermetic compressor, a refrigerant compressor and an electric motor for driving the refrigerant are housed in a single hermetic container, and the refrigerant returning from the outside is returned to the container or shell, and the refrigerant is compressed. It is compressed to a high pressure and sent out, and is now widely used.

In such a hermetic compressor, it is natural that an electric wire or a cable for supplying electricity to the electric motor must be provided through the shell. The terminal at the tip is provided in a terminal box fixed to the shell, and is finally relayed here to a lead wire connected to an AC power supply. An example of a conventional terminal box structure of such a hermetic compressor is shown in FIGS.
This will be described with reference to FIG.

Referring to FIG. 3, a hermetic compressor 1 has a motor and a compressor main body housed in a container or shell 3 supported by legs 2 projecting from the bottom surface.
Only the terminal box 4 is visible. FIG. 4 is a cross-sectional view of FIG.
FIG. 5 is an enlarged view of a part, and FIG. 5 is a cross-sectional view along the line IV-IV in FIG. A terminal box 4 is provided surrounding the terminal box. The terminal box 4 is fixed to the shell 3 by spot welding or the like, but the gap between the two is closed by a gasket 5. The glass terminal 6 connected to the cable of the electric motor (motor) penetrates the shell 3,
This is surrounded by a gasket 5, and terminals of lead wires 7a and 7b are inserted into terminal studs thereof.
These are protected by a box-shaped cover 8 having a hole through which the lead wires 7a and 7b pass (hereinafter, also referred to as a box cover). The box cover 8 is removed for inspection or the like.

In addition to the former conventional terminal box structure shown in FIGS. 3 to 5, each terminal stud in the terminal box is housed by a housing cover as described in Japanese Utility Model Laid-Open No. 5-61474. A terminal box structure of a refrigerant compressor, which is configured so as to surround and enclose silicon rubber in the storage cover, is also known.

[0006]

However, in the former hermetic compressor, the terminal box 4 is mounted on the shell 3 of the hermetic compressor via the gasket 5, but the terminal box 4 of the hermetic compressor is not used. Not only is the shell 3 a separate member, but also the box cover 8 is a separate member. If no special measures are taken, there is a possibility that a small gap may occur. Moisture, dust, and the like invade and adhere to the terminal studs of the glass terminal 6, causing electrical trouble. On the other hand, according to the latter terminal box structure, each of the terminal studs is embedded with the silicone rubber in the storage cover, so the above-mentioned problem is improved.However, when the terminal box is assembled so as not to be displaced by vibration or the like. Since a separate means for firmly fixing the storage cover is required, and moisture or dust is allowed to enter the terminal box, an electrical trouble will occur if the insulation by silicon rubber is broken for any reason. Probability is high. Therefore, the present invention provides a terminal box structure of a hermetic compressor having a good sealing performance so that moisture and dust do not enter the terminal box, and which does not cause insulation failure, contact failure, etc. due to dew condensation at a wire connection portion. It is intended to provide.

[0007]

In order to achieve the above-mentioned object, a terminal box structure according to the present invention provides a hermetic compressor having a shell for hermetically housing a compressor and an electric motor. A terminal portion through which an electric wire extending to the electric motor is connected and a connection terminal pin protrudes outward;
A gasket that surrounds the terminal portion and is in close contact with the outer surface of the shell and that integrally forms a cylindrical wall that surrounds the connection terminal pin; and a front open terminal box disposed along the periphery of the gasket. A box-shaped cover removably mounted in the terminal box and surrounding the cylindrical wall of the connection terminal pin and the gasket; and an end connected to the connection terminal pin and penetrating the terminal box and the cover. And a sealing material filled in the cylindrical wall and burying the connection terminal pins and the ends of the lead wires.

[0008]

According to the above construction, since the gasket and its cylindrical wall which are in close contact with the outer surface of the shell surround the terminal portion and its connecting terminal pins, the sealing material filled in the cylindrical wall is free from moisture, dust and the like. Even if the flow is completely shut off and the temperature of the shell is lowered, dew condensation does not occur on the connection terminal pins, and dew condensation occurs on the outer surface of the filling sealing material and the outer peripheral surface of the cylindrical wall. Moreover, since the cylindrical wall is surrounded by a box-shaped cover, the connection terminal pins are double protected, so that even if the insulation by the filling sealing material in the cylindrical wall is broken, the connection terminal pins are somewhat protected. Protection is possible. In this way, the electricity from the lead wire completely flows to the internal electric motor via the connection terminal pin and the terminal portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. Referring to FIGS. 1 and 2 showing a preferred embodiment of the present invention, a glass terminal (terminal portion) 13 is penetrated into a through hole 11a of a shell of a hermetic compressor 10, that is, a compressor shell 11, and a seat or a nut is provided. 13a. Wire 1 from glass terminal 13
3b and 13c extend to a motor (not shown),
Connection terminal (connection terminal pin) 1 electrically connected to these
3 d and 13 e protrude outside the compressor shell 11. The gasket 15, which is in close contact with the outer surface of the compressor shell 11, integrally forms a cylindrical wall 15a surrounding the connection terminals 13d, 13e in contact with the circumferential surface of the seat 13a.

As shown in FIG. 2, a rectangular terminal box 17 which is open at both ends and surrounds the gasket 15 is fixed to the compressor shell 11 by spot welding via its tongue 17a. Are formed with holes 17b and 17c for passing lead wires. The box cover 19 inserted into the terminal box 17 has spring hooks 19a integrally formed on both sides thereof. As can be understood from FIG.
Is inserted into the terminal box 17, the spring hooks 19a engage with the slots 17d on both sides of the terminal box 17 and are fixed. And terminal box 17
The ends of the lead wires 21 passing through the holes 17b and 17c are engaged with the connection terminals 13d and 13e, and the contact portion is filled with a sealing material 23 such as a silicone sealant from above. The sealing material 23 is fully packed to the outer end of the cylindrical wall 15a, and the lead wire 21 extends through the notch of the cylindrical wall 15a, the bottom notch 19b of the box cover 19, and the holes 17b, 17c of the terminal box 17. Is out.

As described above, the sealing member 23 covers the cylindrical wall 1 of the gasket 15 so as to cover the connection terminals 13d and 13e.
Since it is filled in the inside 5a, even if moisture or the like enters through the box-shaped cover 19, it is prevented from entering the inside of the cylindrical wall 15a, and around the connection terminals 13d and 13e. No condensation occurs. Therefore, electrical troubles such as abnormal contact and poor insulation are effectively prevented. Then, the box cover 19 can be easily removed by pulling the box cover 19 outward while pushing the spring hook 19a from the outside with a finger, and it is easy to determine whether or not cracks in the sealing material 23 and gaps due to poor adhesion have occurred. Will be inspected.

[0012]

According to the present invention, an integral cylindrical wall is formed in a gasket surrounding a terminal portion and a connecting terminal pin therefrom, and the inside thereof is filled with a sealing material and solidified, so that fixing means for accommodating the sealing material is provided. It is possible to reliably prevent the flow of moisture, dust, and the like without special need, and to prevent the occurrence of dew condensation on the connection terminal pins.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a terminal box structure according to a preferred embodiment of the present invention.

FIG. 2 is a schematic exploded perspective view of a main part for describing an assembling process of the terminal box structure of the embodiment of FIG. 1;

FIG. 3 is a perspective view conceptually showing a conventional hermetic compressor having a terminal box structure.

FIG. 4 is an enlarged perspective view of a part III in FIG. 3;

5 is a sectional view taken along the line IV-IV in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Hermetic compressor, 11 ... Compressor shell (shell), 11a ... Through-hole, 13 ... Glass terminal (terminal part), 13b, 13c ... Electric wire, 13d, 13e ... Connection terminal (connection terminal pin), 15 ... Gasket , 15a: cylindrical wall, 17: terminal box, 19: box cover (box-shaped cover), 21: lead wire, 23: sealing material.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-61474 (JP, U) JP-A 4-88319 (JP, U) JP-A 60-128420 (JP, U) JP-A 57- 113481 (JP, U) Shokai Sho 56-26875 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 3/08 F25B 49/02 560

Claims (1)

(57) [Claims] 1. A hermetic compressor having a shell for hermetically housing a compressor and an electric motor, wherein an electric wire penetrating through the through hole of the shell and extending to the electric motor is connected, and a connection terminal pin protrudes outward. A terminal part provided, a gasket surrounding the terminal part, being tightly attached to the outer surface of the shell, and integrally formed with a cylindrical wall surrounding the connection terminal pin;
A terminal box having an open front disposed along the periphery of the gasket, a box-shaped cover removably mounted in the terminal box and surrounding the connection terminal pins and the cylindrical wall of the gasket; and the connection terminal. A lead having an end connected to a pin and extending to the outside through the terminal box and the cover; and a sealing material filled in the cylindrical wall and embedding the ends of the connection terminal pin and the lead. A terminal box structure of a hermetic compressor characterized by having: