CN1360321A - Terminal equipment of electric appliance - Google Patents

Abstract

A terminal device for an electrical appliance, which has an outer lead-out terminal rod with a convex edge at the center, and is composed of an outer insulating terminal base and an inner insulating terminal base, one of which is provided with a concave portion and the other is provided with a convex portion as a concave-convex part fit to fit each other, and a spot-faced insulated terminal seat is formed on the above-mentioned outer insulating seat so that the flange part of the above-mentioned external lead-out terminal rod cannot rotate. The shell of the through hole with the seat in a non-rotatable state, and the fixing mechanism for fixing the above-mentioned externally drawn terminal rod on the above-mentioned shell through the above-mentioned insulating terminal seat; Concave-convex parts that cooperate with each other are embedded. The terminal device has an excellent function of preventing the rotation due to the turning torque, prevents the reduction of the function of the terminal part caused by human error, has excellent assembly processability due to the simple structure, is convenient to use, and can also reduce the price.

Description

Electrical Terminal Devices

technical field

The present invention relates to a terminal device of an electrical appliance, in particular to a capacitor for power transmission used to improve power factor, and a terminal device for electrical appliances such as capacitors of various power lines.

Background technique

Conventionally, the structure of the terminal part for communicating the electric characteristics of the capacitor to the outside, such as a capacitor for power transmission, is as disclosed in KOKAI Publication No. 57-97930 and JP-KOKAI Publication No. 9-129489.

The structure thereof will be described with reference to FIGS. 8-10 . The structure of the terminal device of the electrical component published in the Publication No. 57-97930 is shown in FIG. 8 and FIG. 9 . In Fig. 8 and Fig. 9, 11 is the metal shell of the main body of the electrical device, and what is shown in the figure is its upper cover part. 11a is an opening protruding from the peripheral portion of the metal shell 11, and 12 is a bolt whose head 12a is inside the shell 11 and passes through the opening 11a. 13 is a silicone rubber packing, which is inserted between the bolt 12 and the opening 11a of the metal box 11. 14 is a fixed ring disposed on the outer circle of the packing 13 inside the metal shell 11, made of a laminated plate, and used to restrain the deformation of the packing 13 during terminal assembly. 15 is an insulating plate passing through the bolt 12 between the fixing ring 14 and the head 12a of the bolt 12, made of a laminated plate, used to restrain the deformation of the filler 13 to the inner side of the metal box 11, that is, downward. 16 is an anti-rotation part inserted between the insulating plate 15 and the head 12a of the bolt 12, and 17 is an insulator passing through the bolt 12 on the outside of the metal shell, which is used to restrain the deformation of the packing 13 to the outside of the metal shell. At the same time, there are a plurality of protruding claws 17 a on the bottom of the insulator 17 , which cooperate with the recesses 11 b integrally formed around the periphery of the opening 11 a of the metal shell 11 .

After the above other parts have been assembled, the nut 18 is tightened to the state shown in FIG. 8 , and finally the head portion 12a of the bolt 12 and the anti-rotation fitting 16 are fixed by soldering 20 . As a result, when a nut or the like is fastened to the bolt 12 outside the terminal, the bolt 12 does not rotate.

The above configuration realizes a terminal that not only bears the necessary load but also has stable sealing performance and has high mechanical strength against rotational torque.

The structure of the electrical insulator-shaped terminal disclosed in JP-P9-129489 Announcement is shown in FIG. 10 . Figure 10. On the insulator 21, only the insulator press-in part 21a is processed and formed, and the metal shell is drawn and processed on the upper plate 25 to integrally form a stepped cylindrical part 26, and a packing 27 is placed in the step-shaped part, and the insulator press-in part of the insulator 21 21a is pressed into the small-diameter cylindrical portion 26a with the stepped cylindrical portion 26, and the insulator 21 and the upper plate 25 are integrated and fixed. That is to say, the external terminal parts such as the insulator 21 and the terminal rod 22 are fixed on the upper plate 25 by pressing the insulator press-in part 21a into the stepped cylindrical part 26, and the terminal rod 22 is realized by the stress of its pressing. Stop rotation and fix.

Conventional examples have the following problems. As shown in Figure 8, in the electrical component terminal device disclosed in the Publication No. 57-97930, in order to prevent the rotation of the bolt 12, a stop component 16 is inserted between the insulating plate 15 and the bolt head 12a, and the The stop part 16 must be fixed to the head 12a of the bolt with solder 20 around it. Therefore, the number of parts is very large, and at the same time, the small concave portion 11b must be formed on the metal shell 11 and the corresponding small protrusion-shaped claw 17a of the insulator must be processed. Furthermore, the nut 18 is tightened from the outside, so it is also possible to remove it from the outside. Customers using these components may run the risk of removing the nut 18 due to human error.

The insulator-shaped terminal device of the electrical appliance shown in the Japanese Patent Application Publication No. 9-129489 is to apply deep-drawing processing on the upper plate 25 to form a stepped cylindrical portion 26, and then press the insulator pressing-in portion 21a of the insulator 21 into the stepped cylindrical portion. The insulator 21 and the upper plate 25 are mounted and fixed integrally in the small-diameter cylindrical portion 26a of the cylindrical portion 26. Therefore, the fixing of the terminal rod 22 is only maintained by press-fit stress. That is to say, the size of the small-diameter cylindrical part 26a formed by deep drawing on the upper plate 25 must be exactly the same as the size of the insulator press-in part 21a. Part 26a is incompletely fixed. For the same reason, it cannot be said that the circular press-fit part can resist the turning torque mechanically.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a terminal device of an electrical appliance, which has an excellent function of preventing rotation due to turning torque, prevents the reduction of the function of the terminal part caused by human error, and has the advantages of simple structure and The excellent assembly manufacturability brought by it is convenient to use and the price can also be reduced.

The terminal device of the electrical appliance of the present invention is characterized in that it has an outer lead-out terminal rod with a convex edge in the center, and is composed of an outer insulating terminal base and an inner insulating terminal base, one of which is provided with a concave portion and the other is provided with a convex portion. part as a concave-convex fitting part to fit each other and form a spot-faced hole on the above-mentioned outer insulating terminal base so that the flange part of the above-mentioned externally drawn terminal rod is in a non-rotating state of the insulating terminal base. The external insulation terminal block is in a non-rotatable through-hole casing, and the fixing mechanism for fixing the above-mentioned external lead terminal rod to the casing by means of the above-mentioned insulating terminal block; the above-mentioned internal insulation terminal block is arranged inside and outside the through-hole of the above-mentioned casing and the above-mentioned outer insulating terminal block and make them fit in the mutual concave and convex parts.

According to the terminal device of an electric appliance of the present invention, by providing a flange portion at the center of the terminal rod and providing a spot facing hole on the insulating terminal base, the external terminal rod can be prevented from rotating due to the rotational torque. In addition, the convex part of the insulating terminal base penetrates the through hole of the housing in a state where the outer insulating terminal base cannot rotate, so that the rotation caused by the rotational torque of the outer insulating terminal base or the housing can be prevented, and as a result, the terminal device of the electrical appliance can be completely prevented. The rotation of another part due to the rotational torque.

Therefore, there are no other parts that may be removed by the user outside the shell, which can completely prevent damage to the terminal device structure of the electrical appliance due to human errors. At the same time, the outer insulating terminal seat and the shell , Inner insulating terminal bases can be squeezed together to form a terminal device, so the structure is simple, the assembly process is superior, the use is also convenient, and the price can also be reduced.

In addition, according to the terminal device of the electrical appliance of the present invention, thermosetting resin is used, and its heat resistance is better than that of general plastic materials. Compared with plastic materials, it can prevent the insulation terminal block from being deformed or melted due to heat.

In addition, thermosetting resin has higher withstand voltage and leakage resistance than general plastic materials. Compared with insulated terminal blocks using general plastic materials, the size of insulating terminal blocks is small, and even if the terminal part is stained with water, it is water-resistant and conductive. Sex is also superior.

In addition, thermosetting resins have higher hardness than ordinary plastic materials, and are less likely to shake compared to insulating terminal blocks made of ordinary plastic materials. At the same time, compared with insulating terminal blocks made of ceramic insulators, even It is not easy to break when the tightening force exceeds the design value.

According to the terminal device of the electrical appliance of the present invention, the first seal is used between the bottom of the countersink hole and the flange, and the second seal is used between the shell and the external insulating terminal block to improve the tightness inside the shell and ensure the seal. The unique structure is simple and the assembly process is superior.

Description of drawings

Fig. 1 is a side sectional view of a terminal device according to Embodiment 1 of the present invention.

Fig. 2 (a) is a front view of the middle part of the external lead terminal rod in Embodiment 1 of the present invention, and Fig. 2 (b) is a top view of the external lead terminal rod.

3( a ) is a top view of the outer insulating terminal base of Embodiment 1 of the present invention, ( b ) is its side view, ( c ) is its bottom view, and ( d ) is its side sectional view.

Fig. 4(a) is a side view of the upper cover part of the capacitor case according to Embodiment 1 of the present invention, and Fig. 4(b) is a plan view of the upper cover part thereof.

5( a ) is a plan view of an insulating terminal base in a capacitor terminal portion according to Embodiment 1 of the present invention, ( b ) is a side view thereof, and ( c ) is a cross-sectional view thereof.

Fig. 6 is a side sectional view showing the structure of a capacitor terminal device according to Embodiment 2 of the present invention.

7( a ) is an enlarged view in B of FIG. 6 , and (b) is a horizontal cross-sectional view of the gasket portion in part B of FIG. 6 .

Fig. 8 is a side sectional view of a conventional example.

Fig. 9 is a bottom view of a conventional example.

Fig. 10 is a side sectional view of another conventional example.

In the figure, 1-external lead terminal rod, 1a-flange part of terminal rod, 1b-threaded part of terminal rod, 2-outer insulating terminal seat, 2a-spot facing outer insulating terminal seat, 2b-through hole of outer insulating terminal seat, 2c-Protruding part of outer insulating terminal seat, 2d-Groove, 3-Internal insulating terminal seat, 3b-Through hole of inner insulating terminal seat, 3c-Concave part of inner insulating terminal seat, 4-Nut, 5-Flat washer, 6-Capacitor Shell, 6c-capacitor case through hole, 7-Second sealing washer, 8-First sealing washer.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a cross-sectional view of the structure of a terminal device of an electric appliance according to Embodiment 1 of the present invention.

The terminal device of the electric appliance in this embodiment is a capacitor terminal part, and the capacitor case 6 is a metal shell, and a plurality of capacitor elements are housed inside it. The terminal portion shown in FIG. 1 is provided on the upper cover portion of the housing 6 .

The terminal device of this electrical equipment, namely the terminal of capacitor, is contained in the loam cake of capacitor case 6 and is provided with lead-out bar 1, outer insulating terminal base 2, inner insulating terminal base 3, nut 4 and flat washer 5.

FIG. 2 is a front view and a bottom view of the externally drawn terminal rod 1 . As shown in FIG. 2 , the externally led terminal rod 1 has a threaded portion 1b at the upper and lower ends and a flange portion 1a in the middle. The cross-sectional shape of the flange portion 1a is a regular hexagon, and the outer diameter of the threaded portion 1b is smaller than the diameter of the circle inscribed in the regular hexagon.

FIG. 3 is a top view, a front view, a bottom view and a sectional view of the outer insulating terminal block 2 . As shown in FIG. 3, the outer insulating terminal block 2 is cylindrical, and a spot facing hole 2a with a regular hexagonal cross-section is made in its center, and a through hole 2b with a circular cross section is formed in its inner part following the spot facing. Meanwhile, a convex portion 2c having a square cross section is provided on the bottom surface thereof.

FIG. 4 is a sectional view and a top view of the opening of the upper cover of the capacitor case 6 . As shown in FIG. 4 , there is a square opening 6 c on the upper cover of the capacitor case 6 . The shape and size of the square opening 6c can allow the convex portion 2c of the square section of the outer insulating terminal base 2 to be embedded therein.

FIG. 5 is a plan view, a front view and a side sectional view of the inner insulating terminal block 3 . As shown in Figure 5, the inner insulating terminal block 3 has a concave portion 3c that can be embedded in the convex portion 2c of the outer insulating terminal block 2, and in the center of the concave portion there is a circular through hole that penetrates the threaded portion 1b of the outer lead terminal rod 1 3b.

The terminal portion of the capacitor of this embodiment composed of these components has the following structure. That is, the outer insulating terminal block 2 and the inner insulating terminal block 3 are embedded with the concave and convex parts 2c, 3c and fitted together, and the outer lead terminal rod 1 is passed through the through hole 2b of the outer insulating terminal block 2 and the inner insulating terminal block 3, 3b, fix the lower side threaded part 1b of the externally drawn terminal rod 1 with a nut and a flat washer 5 inside and outside the opening 6c provided on the upper cover of the capacitor electric housing 6 .

A method of manufacturing the capacitor terminal portion of this embodiment will be described below. Insert the external lead terminal rod 1 into the spot facing hole 2a of the external insulating terminal base 2, and at the same time fix the external lead terminal rod 1 in the inner direction on the bottom of the spot facing hole, since the cross section of the spot facing hole 2a is a regular hexagon, it is also fixed. The direction of rotation of the outgoing terminal rod 1 is indicated. Next, insert the convex portion 2c with a square cross-section formed on the bottom surface of the outer insulating terminal base 2 into the opening 6c of the upper cover of the capacitor case 6 with the same cross-sectional shape, and simultaneously fix the rotation direction of the outer insulating terminal base. Then, the concave portion 3c formed in the inner insulating terminal block 3 having the same cross-sectional shape as the opening 6c is fitted from the inside of the capacitor case 6 to the convex portion 2c of the outer insulating terminal block 2 passing through the opening 6c. Then, make the threaded part 1b of the externally drawn terminal rod 1 pass through the circular through hole 3b formed in the center of the above-mentioned recessed part 3c, and use a suitable nut 4 and flat washer 5 on the threaded part 1b that has passed through to draw the externally drawn terminal rod. 1. The outer insulating terminal block 2, the capacitor shell 6, and the inner insulating terminal block 3 are fixed into one body.

This structure can prevent the rotation of the outer insulating terminal block 2, because the convex part 2c of the square section of the outer insulating terminal block 2 is embedded in the square opening 6c formed on the upper cover of the capacitor case 6. And because the cross-section formed on the outer insulating terminal base 2 is a square protrusion 2c that is inserted into the square through hole 6c formed on the upper cover of the capacitor case 6, so it can fully ensure that the outer terminal rod 1 is connected with the capacitor case. 6. Insulation between the upper covers.

Moreover, the square cross-sectional convex portion 2c provided on the bottom surface of the outer insulating terminal base 2 cooperates with the concave portion 3c of the inner insulating terminal base 3, and the threaded portion of the outer lead-out terminal rod 1 passing through the outer insulating terminal base 2 and the inner insulating terminal base 3 1b Screw on the nut 4 to fix it, so it can completely prevent the externally drawn terminal rod 1 and the externally insulated terminal base 2 from being pulled out, and at the same time realize the stable fixing of the externally insulated terminal base 2, and can also fully ensure the externally drawn Electrical insulation between the terminal rod 1 and the upper cover of the capacitor case 6 .

In addition, due to the countersink hole 2a of the regular hexagonal cross-section of the outer insulating terminal base 2, although the outer lead-out terminal rod 1 is inserted into the outer insulating terminal base 2, the convex edge of the regular hexagonal cross-section provided on the outer lead-out terminal rod 1 The part 1a is inserted along the regular hexagonal cross-section spot facing hole 2a provided on the outer insulating terminal base 2, and the bottom of the regular hexagonal spot spotting hole at the end point acts as a stop to the inner side of the capacitor case, so that it can be fixed on the capacitor shell. effect on the site.

In addition, the cross-section of the flange portion 1a of the outgoing terminal rod 1 is preferably a regular polygon such as a regular triangle, a square, or a regular hexagon, and may not be a regular polygon. In addition, non-circular shapes such as ellipses can also be used. Correspondingly, the cross-section of the countersunk hole 2a on the outer insulating terminal base 2 can also be a polygon such as a regular triangle, a square, and a regular hexagon, even if it is not a regular polygon. In addition, it can be processed into a non-circular shape such as an ellipse. However, if it is processed into a shape larger than a regular octagon, the anti-rotation effect on the rotation torque will be reduced, so it is not recommended.

In addition, the concavo-convex portions of the outer insulating terminal block 2 and the inner insulating terminal block 3 can also be processed in reverse. That is, it is also possible to process the outer insulating terminal block 2 into a concave part, and the inner insulating terminal block 3 matched with it to be processed into a convex part. Furthermore, the cross-section of the concavo-convex portion may be non-circular such as a polygon other than a quadrangle or an ellipse. The corresponding through hole of the capacitor case 6 may be a polygon other than a quadrangle or a non-circle such as an ellipse. The outer shape of the inner insulating terminal block 3 is shown as a circle, but even if it is a shape other than a circle, its function will not be affected.

The fixing mechanism can also use riveting instead of nuts. The insulating terminal blocks 2, 3 are desirably machined from a thermosetting resin.

Since thermosetting resin has superior heat resistance than general plastic materials, it can be compared with general plastic materials when soldering to prevent loosening of nuts and when heat is generated due to abnormally large currents passing through the terminal rods in internal components. Prevents deformation and melting of insulating terminal blocks caused by heat.

In addition, an external voltage is generally applied to the terminal device, which must have the withstand voltage performance and leakage resistance performance between the potential part and the ground wire, but the general plastic material has a low voltage resistance and requires a large insulation distance. Therefore, if ordinary plastic materials are used to make the insulating terminal base, its size will be relatively large. On the contrary, the thermosetting resin has high pressure resistance, so a large insulation distance is not required, and the size of the insulating terminal base can be reduced compared with the insulating terminal base made of ordinary plastic materials. At the same time, the thermosetting resin has good leakage resistance. In other words, even if moisture adheres to the terminal device, the leakage voltage of the insulating surface is high, so it has excellent water resistance and conductivity.

Furthermore, the thermosetting resin has higher hardness than ordinary plastic materials, so it is difficult to shake compared with the insulating terminal blocks of ordinary plastic materials, and compared with the insulating terminal blocks of ceramics and other electric ceramics, even if the tightening force is higher than Above the design value, it is not easy to break.

Fig. 6 and Fig. 7 are embodiment 2 of the present invention, and the difference with embodiment 1 is that the first sealing washer 8 is sandwiched between the flange part 1a and the bottom of the spot facing hole 2a, and the capacitor case 6 is connected to the outer insulating terminal The second sealing gasket 7 is sandwiched between the seats 2. At the same time, the size of the outer circle of the inscribed circle of the hexagonal section of the flange part 1a is larger than the outer circle size of the first sealing gasket 8, and the outer insulation terminal seat 2 The periphery of the convex portion 2c on the bottom surface of the bottom surface is provided with a groove 2d in which the second sealing gasket 7 is embedded.

As shown in FIG. 6 and FIG. 7, the size of the flange portion 1a of the outgoing terminal rod 1 is designed to be larger than that shown in Embodiment 1, so that the first sealing gasket 8 can be easily inserted. At the same time, since the above-mentioned groove 2d determines the position of the second sealing gasket 7, the airtightness in the capacitor casing 6 is improved, and the shape to ensure the airtightness is simple, and the other parts can be fixed into one body, and the assembly work is simple and easy. .

The difference between the manufacturing method of the capacitor terminal in Embodiment 2 and the capacitor terminal manufacturing method in Embodiment 1 is as follows: Before inserting the externally drawn terminal rod 1 into the countersink hole 2a of the external insulating terminal base 2, the external insulating terminal base 2 must The bottom of the formed spot facing part 2a is fitted with the first sealing gasket 8 sandwiched between the flange part 1a and the bottom of the spot facing hole 2a, and the convex part 2c of quadrilateral cross section formed by the bottom surface of the outer insulating terminal base 2 is inserted into its cross section. Before the through hole 6c on the upper cover of the capacitor case 6 with the same shape, the second sealing gasket 7 sandwiched between the bottom surface of the outer insulating terminal block 2 and the capacitor case 6 is embedded in the groove 2d on the bottom surface of the outer insulating terminal block 2 .

In addition, the insulating terminal blocks 2 and 3 in the second embodiment may be made of thermosetting resin, or may be made of thermoplastic resin or ceramics other than thermosetting resin.

In this way, the airtightness inside the case is higher, and the structure for ensuring the airtightness is simple, and the assembling workmanship is excellent.

Claims (7)

1. the arrangements of terminal of an electrical equipment is characterized in that having:

At central part the external leading-out terminal rod of convex edge is arranged,

By external insulation terminal base and interior insulating end stroma constituted, one of them is provided with recess and another is provided with protuberance and cooperate the insulating end stroma make it chimeric mutually and form the spot-facing that the convex edge that makes above-mentioned external leading-out terminal rod can not rotary state on above-mentioned external insulation stool as jog

Have the protuberance that makes above-mentioned insulating end stroma and run through the shell that above-mentioned outer end stroma is in through hole that can not rotary state,

With by above-mentioned insulating end stroma above-mentioned external leading-out terminal rod is fixed on fixed mechanism on the above-mentioned shell;

The jog that cooperatively interacts at the above-mentioned inner stroma of inside and outside configuration of the through hole of above-mentioned shell and outer end stroma and setting-in.

2. the arrangements of terminal of an electrical equipment is characterized in that having:

At central part the external leading-out terminal rod of convex edge is arranged,

By external insulation terminal base and interior insulating end stroma constituted, one of them be provided with recess and another be provided with protuberance as concavo-convex auxiliary section make it can not to rotate mutually chimeric, on above-mentioned external insulation terminal base, form the convex edge that makes above-mentioned external leading-out terminal rod and be in spot-facing that can not rotary state and form the through hole that an end of above-mentioned external leading-out terminal rod is run through and make bottom the above-mentioned spot-facing and the insulating end stroma of above-mentioned concavo-convex auxiliary section connection

Have the protuberance that makes above-mentioned insulating end stroma run through above-mentioned external insulation terminal base be in through hole that can not rotary state shell and

By above-mentioned insulating end stroma is that above-mentioned external leading-out terminal rod is fixed on fixed mechanism on the above-mentioned shell;

Inside and outside the through hole of above-mentioned shell configuration above-mentioned in insulating end stroma and above-mentioned external insulation terminal base and setting-in the jog that cooperatively interacts, and in above-mentioned insulating end stroma and above-mentioned shell and above-mentioned external insulation terminal base with above-mentioned convex edge with said fixing mechanism is crowded is fitted together.

3. the arrangements of terminal of electrical equipment according to claim 1 is characterized in that the insulating end stroma makes with thermosetting resin.

4. the arrangements of terminal of electrical equipment according to claim 1 is characterized in that being equipped with between the 1st seal washer, shell and the external insulation terminal base between spot-facing bottom and the convex edge the 2nd seal washer is housed,

5. according to the arrangements of terminal of claim 1,2 or 3 described electrical equipment, it is characterized in that convex edge and spot-facing are corresponding mutually polygons, and protuberance and through hole are corresponding mutually polygons.

6. according to the arrangements of terminal of claim 1,2,3 or 4 described electrical equipment, it is characterized in that fixed mechanism is screw thread and nut.

7. according to the arrangements of terminal of claim 1,2,3 or 4 described electrical equipment, it is characterized in that fixed mechanism is riveted joint.

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