JP2003187660A - Sealed terminal for electronic equipment and its mounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulator terminal for a sealed type electronic equipment of which an assembly method is extremely simple with a packing system of an excellent sealing property and reliability. <P>SOLUTION: A drum-shaped inner pedestal is set halfway along a through-hole from an insertion part at one end part of an insulator to a pedestal at the other end, and a bolt terminal with a brim insertion-coupled with the inner pedestal is put through the through-hole and is fastened with a nut. For fixing of a top lid and the insulator of the electronic equipment, a ring-shaped concave groove and a longitudinal concave groove are provided at an outer periphery of the insulator insertion part, the insertion part is put through a top lid hole with a protrusion, into which a presser bar spring leaf and a ring-shaped coil spring are put, the latter inserted into the ring-shaped concave groove, and are fastened and fixed with a pressing screw fitted to the presser bar spring leaf. For maintaining airtight seal of the insulator with the bolt terminal and the top lid, a first packing is arranged between the insulator and the bolt terminal, a second packing between the bolt terminal brim part and the inner pedestal inside the insulator, and a third and a fourth packings between the insulator and the top lid. Rotation of the bolt terminal is stopped by insertion-coupling of the bolt terminal brim part and the inner pedestal as well as that of the insulator longitudinal groove and the top lid hole protrusion. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed insulator terminal used in electric equipment such as a capacitor and its mounting structure, and is applicable to low voltage, small capacity to high voltage, large capacity. The present invention relates to an insulator terminal.

[0002]

2. Description of the Related Art Conventionally, as a sealed type insulator terminal for electric equipment, as shown in FIG. 8, one having a structure of a metallicon treated insulator terminal has been generally used. That is, the opening portion at one end is a cylindrical insertion portion 31, a through hole 32 is provided in the center portion, a metal layer 33 is formed on the upper side surface by metallikon treatment, and a metal layer 34 for fixing the body is also formed on a predetermined periphery by metallikon treatment. Bolt terminal 3 with a collar using the insulator 35
6, the flange portion 37 and the metal layer on the upper side surface are soldered, and a base ring 38 formed in an annular shape on the metal layer 34 for fixing the main body by drawing is attached to the cylindrical insertion portion 31 and the solder. Integrate by attaching. Next, an annular groove 41 is formed by drawing on the periphery of the circular opening 40 provided in the upper lid 39 of the container that houses the electric device body inside,
One end of the base ring is soldered and fixed in the annular groove. A washer 42, a spring washer 43, and a nut 44 are attached to the tip of the flanged bolt terminal. The flanged bolt terminal 36 and the lead wire 45 are connected by welding or the like, and the lead wire is protected by an insulating sleeve 46.

[0003]

The sealed insulator terminal and its mounting structure used in conventional electric equipment such as capacitors are as described above, and the insulator 35 and the bolted terminal 3 with a collar are as described above.
Since the 6 and the base ring 38 and the upper lid 39 are integrally fixed to each other only by soldering, a large stress is applied to the connection work between the flanged bolt terminal 36 and the external connection terminal (not shown), If it is used in that state, there is a problem that the sealing performance is impaired due to variations in soldering work at the time of assembling the insulator, deterioration of the strength of the solder and metallikon over time, and oil leakage and gas leakage occur. Further, in the manufacturing process of integrally fixing the insulator 35, the flanged bolt terminal 36, the base ring 38, and the upper lid 39 by soldering, the solder contains lead metal which is harmful to the environment. Abolition or reduction is desirable.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a sealed type insulator terminal for an electric device and a mounting structure thereof for a packing system having a good sealing property and high reliability. Is provided.

That is, the opening at one end is the insertion portion 2, the opening at the other end is the pedestal portion 3, and the inner pedestal portion 4 is provided in the middle of the terminal hole 5 penetrating from the insertion portion 2 to the pedestal portion 3. Three
Has a curved concave portion, the inner pedestal portion 4 has a concave shape with a step and the opening portion has a drum shape, and an annular groove 6 and an annular convex portion 2c are provided on the outer peripheral portion of the body of the insertion portion 2. Collar part 1 penetrating through the insulator 1 and the terminal hole 5 of the insulator 1 and fitted into the inner pedestal part 4.
0a, which is fixed to the pedestal portion 3 with the nut 20 via the packing seat plate 17, and the bolt terminal 1
A packing seat plate 17 having an opening hole that fits into 0, a ring-shaped first packing 11 arranged in a space between the recess of the pedestal portion 3 and the bolt terminal 10, and a periphery of the opening 9 into which the insulator 1 is inserted. The ring-shaped second packing 14 arranged in the space between the upper lid 8 of the electric device having the annular step portion 8a and the lower surface flat portion 2b of the annular convex portion 2c of the insulator insertion portion 2, and the inner pedestal portion 4 of the insulator 1. Ring-shaped third packing 12 arranged in the space formed by the bottom of the bolt terminal 10 and the packing groove 10b provided in the jaw 10a of the bolt terminal 10, and the coil spring wound around the annular groove 6 of the insulator 1. A hermetically sealed insulator terminal of an electric device and a mounting structure thereof are characterized in that a spring seat plate 15 for fitting and holding 16 is integrally fixed to an upper lid 8.

Further, the annular convex portion 2 of the insertion portion 2 of the above-mentioned insulator 1 is used.
a tip has a step, and the step and the upper lid 8 of the electric device
A ring-shaped fourth packing 13 is disposed in a space formed by the plane of the annular stepped portion 8a around the periphery of the opening 9, and a sealed insulator terminal for an electric device and its mounting structure.

Further, the opening of the inner pedestal portion 4 of the insulator 1 is polygonal, and the collar portion 10a of the bolt terminal 10 is formed.
Is a shape in which the concave portion of the polygon fits, and a sealed insulator terminal for an electric device and a mounting structure thereof.

Then, one or a plurality of recessed grooves intersecting with the annular recessed groove 6 provided in the insertion portion of the insulator 1 are provided, and a projection 9a fitted into the recessed groove is provided in the opening 9 of the upper lid 8. A sealed insulator terminal for an electric device and a structure for mounting the same.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The flange 10a of the bolt terminal 10 has the same shape so that the opening of the inner pedestal 4 of the insulator 1 can be fitted into the drum-shaped recess 4a, and the packing groove provided in the flange 10a. A third portion 10b between the flat portion 4b of the inner pedestal portion 4;
The packing 12 is attached, and the pedestal portion 3 of the insulator 1 has a curved bottom portion 3a, a packing seat plate 17, and the insulator 1 described above.
The first packing 11 is attached between the bolt terminal 10 and the packing seat plate 17, and the bolt terminal 10 is tightened with a washer, a spring washer, and a nut at a specified tightening torque. Next, the insulator 1 and the upper lid 8 of the electric device are attached by the fourth packing 13 in the space between the tip step portion 2b of the annular convex portion 2a of the insulator 1 and the flat surface 8b of the annular step portion around the opening of the upper lid. Also, the second packing 14 is attached to the space between the inner side surface of the annular stepped portion 8a at the peripheral edge of the opening of the upper lid and the lower plane portion of the annular convex portion 2a of the insulator 1 insertion portion,
The insertion portion of the insulator 1 is put into the opening 9 of the upper lid 8 and the spring seat plate 1
5 and the coil spring 16 are attached. The coil spring 16 is wound around the annular recessed groove portion 6 of the insertion portion 2 of the insulator 1 and then tightened with a set screw 15a provided on the spring seat plate 15 at a specified tightening torque to be integrally fixed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a drawing of an embodiment of a sealed insulator terminal for electric equipment according to the present invention, (a) is a partial sectional view, (b) is a disassembled component sectional view, and FIG. 2 is an insulator. In the drawings of one embodiment,
(A) is a plan view and a perspective view from above, (b) is a partial front sectional view and a broken perspective view of an intermediate portion, (c) is a bottom view and a perspective view from the bottom. 3A and 3B are drawings of another embodiment of the insulator 1, where FIG. 3A is a plan view, FIG. 3B is a partial front sectional view, and a broken perspective view of an intermediate portion, and FIG. 3C is a bottom view. . 4 is a drawing of another embodiment of the insulator 1,
(A) is a partial front sectional view, (b) is a bottom view and a perspective view from the bottom. 5A and 5B are drawings of an embodiment of the opening portion of the upper lid 8, where FIG. 5A is a plan view and FIG. 5B is a sectional view. Figure 6
Is a spring seat plate 15 for spring retainer in which a push screw 23 is screwed in.
2A is a side view of the embodiment, FIG. 1A is a cross-sectional view, and FIG. FIG. 7 is an embodiment of the coil spring 16 and is a perspective view from above.

The insulator 1 is made of an insulating material made of alumina as a main component and having excellent physical and mechanical characteristics. The insulator 1 has an annular semicircular groove 6 at one end opening on the outer periphery of the body and one or more vertical halves. It has a circular groove 7 and further has an annular convex portion 2a on the outer peripheral portion of the body
Insertion part 2 consisting of tip step part 2b and bottom surface flat part 2c
And has a drum-shaped concave portion 4a and a flat surface portion 4b in the middle of the terminal hole 5 (FIG. 2) or a polygonal concave portion 23a.
And an inner pedestal 4 having a flat portion 23b (FIG. 3),
The other end opening forms a pedestal portion 3 composed of a cylindrical concave portion 3a and a conical curved surface seat portion 3b, and a terminal hole 5 is provided in the central portion. In addition, the bolt terminal 10 passes through the terminal hole to the inner pedestal portion 4, and has a drum-shaped concave portion 4a and a flat surface portion 4b (FIG. 2).
Fitting or polygonal recess 23a and flat surface 23
b (FIG. 3) and has a collar portion 10a having a packing groove 10b, a tip portion having a screw portion for external connection, and an electrical device on the lower rear side of the collar portion 10a. It is a conductor for connecting a lead wire or the like.

An upper lid 8 for sealing a container for accommodating a main body of an electric device is provided with an opening 9 with a projection which fits into one or a plurality of vertical grooves 7 of the above-mentioned insulator 1. An annular step portion 8a and a flat surface portion 8b are formed on the peripheral edge of the portion 9 by drawing. The ring-shaped coil spring 16 is formed by joining a metal wire tension coil spring having a diameter that fits in the annular groove 6 into a ring shape. The spring seat plate 15 has an annular groove 6
It is a metal plate with a semi-groove for fitting and pressing the ring-shaped coil spring 16 attached to the above so as not to come off. The ring-shaped first packing 11 on the pedestal portion side is a contact surface between the conical curved surface seat portion 3b of the insulator 1, the bolt terminal 10 and the packing seat plate 17, and the third packing 12 on the inner pedestal portion is the collar portion 10
The contact surface between the packing groove 10b of a and the flat surface portion 4b of the drum-shaped concave portion 4a of the insulator 1 or the flat surface portion 23b of the polygonal concave portion 23a, and the fourth packing 13 on the insertion portion side are the same as the stepped flat portion 2b of the insulator 1. Annular step 8a around the opening 9 of the upper lid 8
Of the second packing 14 on the contact surface with the flat surface 8b of the upper lid 8
The inner surface of the annular step portion 8a around the opening 9 and the insulator insertion portion 2
This is for preventing oil and gas filling the electric equipment main body container from leaking through the contact surface with the lower surface flat portion 2c, and the cylindrical recess 3a and the conical curved surface seat 3b of the insulator pedestal portion. The diameter of the bolt terminal 10, the packing groove portion of the collar portion 10a, the annular convex portion 2a of the insulator 1, and the inner side surface of the annular step portion 8a at the peripheral edge of the opening 9 of the upper lid 8 have predetermined dimensional accuracy required by each packing described above. Is formed in consideration of.

Next, the procedure for assembling this insulator terminal will be described. First, the bolt terminal 10 is attached to the insulator 1. The ring-shaped third packing 12 is fitted into the packing groove 10b of the bolt terminal 10 having the drum-shaped collar portion 10a and the packing groove 10a in the collar portion, and the bolt terminal is attached to the inner pedestal portion 4 of the terminal hole 5. The first packing 11 and the packing seat plate 1 to the bolt terminals protruding from the insulator base portion 3.
7, through the washer and the spring washer, the first packing 11 is inserted to the conical curved surface seat portion 3b, the nut 20 is screwed into the thread portion of the bolt terminal 10, and the packing is tightened and fixed with a specified torque. Next, the ring-shaped fourth packing 13 is arranged on the annular step plane 8b formed on the periphery of the opening 9 of the upper lid 8, and the ring-shaped second packing 14 is arranged concentrically on the inner surface of the annular step 8a. The insertion portion 2 of the insulator 1 is inserted into the upper lid 8 so that the vertical groove 7 of the insulator 1 and the projection 9a of the opening 9 of the upper lid fit together,
A spring seat plate 15 with a push screw 26 is attached to the insertion portion 2 of the insulator 1.
, The ring-shaped coil spring 16 is extended and wound around the annular recessed groove 6 of the insulator 1, and then the push screw 26 is uniformly tightened with the specified torque to fix the upper lid 8 and the insulator terminal. .

The concave dimensions of the cylindrical concave portion 3a of the pedestal portion 3 of the insulator, the conical portion dimensions of the conical curved surface seat portion 3b, and the bolt terminal 10
The diameter dimension of the first packing 11 is the packing groove dimension of the drum-shaped collar portion 11a or the polygonal collar portion 23a of the bolt terminal 10 is the third packing 12, and the step dimension of the tip step portion 2a of the insulator insertion portion 2 is the fourth. Since the packing 13 and the concave size of the inner side surface of the annular step portion 8a around the opening 9 of the upper lid 8 are determined in consideration of the dimensional accuracy so as not to hinder the packing compression rate with the second packing 14, A constant packing compression ratio is obtained.

The inner pedestal portion of the terminal hole 5 is a drum-shaped concave portion 4a or a polygonal concave portion 23a, and the flange portion of the bolt terminal 10 is formed with a convex portion shaped to fit into the concave portion. It is possible to prevent the bolt terminal 10 and the insulator 1 from rotating by inserting the flange portion 10 and tightening the bolt terminal 10 and the nut 20 with a specified torque. Further, the insert portion 2 of the insulator 1 is provided with one or a plurality of vertical grooves 7, the upper lid is provided with a projection 9a which fits into the vertical groove 7, and the insulator insert portion 2 is inserted into the upper lid, By assembling and fixing, the insulator 1 and the upper lid 8 can be prevented from rotating. Therefore, the bolt terminal 10 is the insulator 1
Then, the upper lid 8 is clamped and fixed without rotating. Also,
It is possible to prevent the bolt terminal 10 and the insulator 1 from rotating in the tightening work at the time of external connection.

In the above embodiment, the first to fourth four
I used one packing, but depending on the application, the fourth
It is also possible to remove and use the packing.

[0017]

EFFECTS OF THE INVENTION The insulator terminal of the hermetically sealed electric device according to the present invention has the above-mentioned structure, so that the assembling work is easy and there is no variation in the work, and the annular flat portion of the insulator insertion portion is tightened with a prescribed tightening torque. By abutting against the annular flat surface portion around the upper lid opening portion, the annular step portion can be prevented from being distorted, stable leakage can be prevented, and the quality can be improved. Especially, the first and third packings are attached to the pedestal part and the inner pedestal part of the insulator.
Further, by adopting a structure in which the fourth and second packings can be mounted on the insertion side of the insulator, more stable leakage prevention can be obtained as compared with the single mounting. In addition, the packing material of the sealed insulator terminal for electric equipment, the material with excellent weather resistance to the outside air on the outside of the equipment, and the packing of the material suitable for oil or gas to fill the inside of the equipment, respectively. They can be selected and mounted, which further stabilizes quality improvement. Also, by stretching the ring-shaped coil spring and winding it around the annular groove of the insulator, the force that tightens the push screw becomes the horizontal elastic force of the coil spring, and the insulator is fixed to the upper lid with a uniform force. effective. Further, there is an effect that excessive tightening of the push screw can be prevented and local cracking of the insulator due to external impact force, thermal expansion strain of the metal and the insulator, and the like can be prevented. In addition, the parts can be reused and can be manufactured at low cost. Furthermore, it has the effect of not using lead metal, which is harmful to the global environment and working environment, and has great industrial and practical value.

[Brief description of drawings]

1A and 1B are drawings of an embodiment of a sealed insulator terminal for an electric device according to the present invention, where FIG. 1A is a partial sectional view and FIG. 1B is a sectional view of an exploded part.

2A and 2B are drawings of an embodiment of the insulator 1, wherein FIG. 2A is a plan view and a perspective view from above, FIG. 2B is a partial front cross-sectional view and a perspective cutaway view of an intermediate portion, and FIG. FIG. 3A is a bottom view and a perspective view from the bottom.

FIG. 3 is a drawing of another embodiment of the insulator 1, (a)
Is a plan view, (b) is a partial front cross-sectional view, and a cutaway perspective view of an intermediate portion, and (c) is a bottom view.

FIG. 4 is a drawing of another embodiment of the insulator 1, (a)
Is a partial front sectional view, (b) is a bottom view and a perspective view from the bottom.

FIG. 5 is a drawing of one embodiment of the opening portion of the upper lid 8,
(A) is a plan view and (b) is a sectional view.

6A and 6B are front views of an embodiment of a spring seat plate into which a push screw is screwed in, FIG. 6A is a sectional view, and FIG. 6B is a perspective view from above.

FIG. 7 is an upper perspective view of an embodiment of the coil spring.

FIG. 8 is a partial cross-sectional view of a conventional insulator-type terminal.

[Explanation of symbols]

1 insulator 2 Insert 2a annular protrusion 2b Tip step 2c Lower surface flat section 3 pedestal 3a Cylindrical recess 3b Conical curved surface seat 4 Inner pedestal 4a drum-shaped recess 4b Drum-shaped flat surface 5 terminal holes 6 annular groove 7 vertical groove 8 Top lid 8a Annular step 8b annular plane 9 openings 9a protrusion 10 volt terminal 10a jaw 10b packing groove 11 First packing 12 Third packing 13 Fourth packing 14 Second packing 15 Spring seat plate 16 coil spring 17 Packing seat plate 18 washers 19 spring washers 20 nuts 21 Lead wire 22 Insulation sleeve 23 Inner base (polygon) 23a Recess (polygon) 23b Flat part (polygon) 24 Lead wire 25 Insulation coating 26 push screw 31 circular insert 32 through holes 33 metal layer 34 Metal layer for fixing the body 35 insulator 36 Bolt Terminal with Collar 37 collar part 38 base ring 39 Upper lid 40 circular opening 41 groove 42 washer 43 Spring washer 44 nuts 45 Lead wire 46 Insulation sleeve

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5G331 AA08 BB11 BB33 CA02 DA04                       FA03

Claims (4)

[Claims] 1. An opening portion at one end is used as an insertion portion and an opening portion at the other end is used as a pedestal portion, an inner pedestal portion 4 is provided in the middle of a terminal hole penetrating from the insertion portion to the pedestal portion, and the bottom portion of the pedestal portion is curved. An insulator having a recessed portion, an inner pedestal portion having a stepped shape, an opening portion having a drum shape, and an annular groove and an annular protrusion portion provided on the outer peripheral portion of the body of the insertion portion, and an insulator of the insulator. A bolt seat that has a flange portion that penetrates the terminal hole and that fits into the inner pedestal portion and is fixed to the pedestal portion with a nut through the packing seat plate, and a packing seat plate that has an opening hole that fits into the bolt terminal A ring-shaped first packing arranged in a space between the recess of the pedestal part and the bolt terminal, and an upper lid of an electric device having an annular stepped portion at the periphery of the opening into which the insulator is inserted and an annular convex part of the insulator insertion part. A ring-shaped second packing arranged in the space between the lower plane part and the inner pedestal of the insulator. Ring-shaped third packing arranged in the space formed by the bottom part of the bolt terminal and the packing groove provided in the jaw of the bolt terminal, and a spring seat for fitting and holding the coil spring wound in the annular groove of the insulator. A sealed insulator terminal for an electric device and a structure for mounting the same, wherein a plate and an upper lid are integrally fixed. 2. A ring-shaped fourth portion is formed in a space formed by the step and the plane of the annular step portion at the periphery of the upper lid opening of the electric device. A sealed insulator terminal for an electric device characterized by arranging packing and its mounting structure. 3. An electric machine characterized in that the shape of the opening of the inner pedestal portion 4 of the insulator 1 is polygonal, and the jaw 10a of the bolt terminal 10 is shaped to fit into the polygonal recess. Equipment sealed insulator terminal and its mounting structure. 4. One or more recessed grooves intersecting with the annular recessed groove provided in the insertion portion of the insulator are provided, and a projection that fits into the recessed groove is provided in the opening of the upper lid. Sealed insulator terminal for electrical equipment and its mounting structure.