JPS6344910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a case-encased switch, and more particularly to a connection structure between a fixed electrode portion within the switch and a conductor penetrating through the bushing.

Normally, when assembling a switch in a case, the bushing is fixed to the case, the internal mechanism is assembled within the case, and the conductor passing through the bushing is electrically connected to the fixed electrode section inside.

However, depending on the structure of the case, it may be difficult to assemble the internal mechanism inside the case.For this reason, it is preferable to set the internal mechanism inside the case in advance, but in this case, the conductor of the bushing There is a particular problem in this connection relationship, as it becomes difficult to connect the fixed electrode portion of the internal mechanism.

The present invention solves this problem by fixing an intermediate fixed electrode to a movable contact blade and a removably provided fixed contact in the case, and attaching a bushing with a connecting electrode corresponding to the intermediate fixed electrode to the case. By fixing it through the bushing, the conductor inside the bushing and the fixed electrode part of the internal mechanism can be connected with one touch without using bolts, etc., making it extremely easy to assemble as this type of switch. It is characterized by being able to eliminate troublesome connection work inside the case.

Hereinafter, an embodiment in which the present invention is embodied in a drum-shaped cased switch will be explained based on the drawings.
In the drawing, 1 is a drum-shaped switch case with a horizontal cylindrical shape, and has legs 2 at the bottom, mounting brackets 3 at the top, and horns 4 that also serve as handles on both sides of the center. There is.

Reference numeral 5 denotes a planar bushing fixing portion protruding from both sides of the case 1, 5a a through hole formed through the bushing fixing portion 5, and 6 both through holes 5.
It is a cylindrical bushing whose outer peripheral flange part 7 is fixed to the case 1 with a metal fitting 8 and bolts 9, and inside thereof there is a rod-shaped bushing whose inner end is a fitting convex part. Conductor 1 as connection electrode 10
1 is fixed through the hole. This conductor 11 is fixed to the bushing 6 by tightening a pair of rings 12 and 13 fitted around its outer periphery to a small diameter portion 15 on the inner periphery of the bushing 6 with a nut 14. 16 is a lead wire connected to the conductor 11 via a molded cone 17.

18 is an insulating tube that integrally covers the outer periphery of the connection electrode 10 except for the tip and the nut 14; 19 is filled between the outer periphery of the base end of the insulating tube 18 and the inner periphery of the bushing 6. It is a filler made of insulating material such as urethane.

Although the inside of the bushing 6 on the left side of FIG. 1 is not shown, it has the same structure as the bushing on the right side.

Reference numeral 20 denotes a rotating body provided for each phase at the axial center position of the switch case 1, and includes a movable contact blade 21.
is fixed. 22 is a movable contact blade 2 of each different phase.
This is an insulator installed between 1 and 1.

Reference numerals 23 and 24 denote first and second protective covers that are arranged and fixed to the outer periphery of the case 1 so as to face each other, and are cast molded from an insulating material and function as a barrier between the protective covers and the ground. Reference numerals 25 and 26 are support parts formed at mutually opposing ends of the protective covers 23 and 24 with the rotating body 20 at the center, and one end of each of the conductive metal fittings 27 and 28 is embedded and fixed by simultaneous casting. has been done. In addition, the protective cover 23,
24 is fixed to mounting portions inside the case 1 at both ends. 29 is a fixed contact fixed to one of the conductive metal fittings 27, into which the movable contact blade 21 is inserted and removed. Reference numeral 30 denotes a flexible conductor that can be expanded and contracted and connected between the other conductive metal fitting 28 and the movable contact blade 21. Therefore, when the movable contact blade 21 is inserted into the fixed contact 29, one of the conductive metal fittings 2
7, an electric path is formed which passes through the fixed contact 29, the movable contact blade 21, the flexible conductor 30, and the other conductive metal fitting 28, respectively.

In addition, since this embodiment is a single-break switch, the movable contact blade 21 may still become a live part even in the open state, so the second protective cover 2
A ground barrier portion 31 extending from the end of the first protective cover 23 toward the inner peripheral side of the first protective cover 23 is integrally formed. or,
In the case of a two-point switch, the contact blade 21 is completely movable.
Since it is open from the electric circuit, this barrier section 31 may be omitted.

32 is an arc extinguishing device fixed to the conductive metal fitting 31 via a mounting metal fitting 33 and arranged so as to cover the fixed contact 29 and the movable contact blade 21. 3
Reference numeral 4 denotes an electrode protection cover attached to a part of the fixed contactor 29 to protect the same phase.

35 is fixed to the buried side end portions of the conductive metal fittings 27 and 28, and its base end is connected to the support portions 25 and 28.
26, each having a plurality of grooves 35a as fitting recesses, is a tulip-shaped intermediate fixed electrode, and by assembling the bushing 6 to the case 1, the connection electrode 10 in the bushing be inserted. Note that after this intermediate fixed electrode 35 is fixed to the conductive metal fitting 27, it is attached to the support part 2.
5 and 26 were cast and fixed at the same time.

Reference numeral 36 denotes a protruding portion integrally formed on the supporting portions 25 and 26 so as to surround both the intermediate fixed electrodes 35 at a certain distance, and for increasing the withstand voltage. It wraps around the inner periphery and the outer periphery of the insulating tube 18 with a space in between.

Therefore, both the protective covers 23 and 24, to which the intermediate fixed electrode 35 has been cast and fixed in advance, are attached to the movable contact blade 2.
If both bushings 6 are fixed to the case 1 after being assembled into the case 1 together with other internal mechanisms such as No. 1, the connection electrode 10 in the bushing 6 is inserted into the intermediate fixed electrode 35 and Fixed contact 2
9 or the movable contact blade 21 and the conductor 11 in both bushings 6 are ensured to be energized. In this way, the fixed electrode part of the internal mechanism of the case 1 and the conductor 11 of the bushing 6 can be connected by simply assembling the bushing 6, which eliminates the troublesome connection and assembly work inside the case, making assembly very easy. can be done.

In this embodiment, the intermediate fixed electrode 35 is cast and fixed to the supporting parts 25 and 26 at the same time, so that the intermediate fixed electrode 35 can be assembled very easily.

Further, in this embodiment, the protrusion 36 and the bushing 6
At the same time, an insulating tube 18 is provided around the outer periphery of the connecting electrode 10, and the insulating tube 1
8 is also made to overlap with the protruding part 36, so even if the insulation distance is not large, the small insulation distance can be effectively used to ensure reliable insulation, and this part can be made more compact, thereby increasing the overall size. can be made compact. Furthermore, since the intermediate fixed electrode 35 is formed into a tube shape into which the rod-shaped connection electrode 10 is inserted, a sufficient contact area can be ensured even if the axes of the electrodes 35 and 10 do not coincide, which can prevent current conduction. There is no danger of falling into this situation.

As exemplified above in the embodiments, the present invention fixes the intermediate fixed electrode electrically connected to the fixed contact in the case to the support member made of an insulating material fixed in the case, and The intermediate fixed electrode is provided with a fitting recess or a fitting protrusion, and the support member is integrally formed with a protrusion that surrounds the outer periphery of the tip protrusion of the intermediate fixed electrode at a slight interval. The connection electrode of the bushing fixed to the case is provided with another fitting convex part or fitting concave part that fits into the fitting convex part or fitting convex part of the intermediate fixed electrode when the bushing is attached to the case. This has the excellent effect of eliminating the troublesome connection work inside the case and making assembly extremely easy.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the spirit of the invention, for example, by reversing the uneven relationship between the intermediate fixed electrode and the connection electrode.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an air switch embodying the present invention, and FIG. 2 is a front view showing a fixed contact and an intermediate electrode. Switch case 1, bushing 6, connection electrode 10 having a fitting protrusion or fitting recess, support parts 25, 2
6. Fixed contact 29, intermediate fixed electrode 35 having a fitting recess or fitting protrusion, and a protrusion 36.

Claims (1)

[Claims for Utility Model Registration] 1. An intermediate fixed electrode electrically connected to a fixed contact in a case is fixed to a support member made of an insulating material fixed in the case, and the intermediate fixed electrode is is provided with a fitting concave portion or a fitting convex portion, and further has a protrusion integrally molded on the support member to surround the outer periphery of the tip protrusion of the intermediate fixed electrode at a slight interval, and is fixed to the case. The connecting electrode of the bushing is provided with another fitting convex portion or fitting concave portion that fits into the fitting concave portion or fitting convex portion of the intermediate fixed electrode when the bushing is attached to the case. Switch in case. 2. The cased switch according to claim 1, wherein the bushing has an inner end that surrounds the outside of the protrusion of the support member and wraps with the protrusion. 3. The cased switch as set forth in claim 1 of the utility model registration claim, wherein the intermediate fixed electrode is cast simultaneously on the support member. 4. The case-enclosed switch according to claim 1, wherein the intermediate fixed electrode has a tube shape, and the connecting electrode is a rod-shaped thing inserted into the intermediate fixed electrode. 5. The case-enclosed switch according to claim 1, wherein the connecting electrode has an insulating tube that wraps with the protruding part of the support member on the outer periphery of the connecting electrode other than the insertion part.