JPH031870Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) In gas insulated busbars and other electrical equipment, sliding contacts are used for conductor connections. This contactor is generally covered with a shield in order to alleviate the electric field between the opposing electrodes. The present invention relates to such a shielded contact device.

(Prior art) Fig. 1 shows an example of a conventional device, in which 1 is a contact piece;
Reference numeral 2 denotes a contact piece holder, which consists of two chrysanthemum seats 3 and 4 whose tips are spaced apart from each other in circumference, and the contact pieces 1 are housed in a plurality of notches 3a and 4a provided on the circumference, respectively. has been done. 5 is a spring for tightening the contact piece. Reference numeral 6 denotes a fixed conductor, and a contact piece holder 2 is fixed to the tip of the fixed conductor with a bolt 7. A movable conductor 8 is bridged with the fixed conductor 6 by a contact piece 1. Note that the head of the bolt 7 may also be used as a guide for the movable conductor 8. 9 is a shield. This shield 9 has a cylindrical shape and has a base 9a fixed to the fixed conductor 6. In the case of a gas insulated bus bar, the entire busbar is housed in a grounded container 11 filled with an insulating gas 10 such as SF ₆ gas at a predetermined pressure.

(Problems to be Solved by the Invention) Although the above configuration is useful in its own way, the inner diameter of the tip 9b of the shield 9 cannot be made smaller than the maximum outer diameter L of the contact piece 1 due to the structure. In addition, since the electric field strength of the shield 9 is determined by the radius of curvature of the tip 9b, it is necessary to increase this in order to lower the electric field, and from this point of view, the shield 9
It is necessary to increase the outer diameter of the In addition, the shield 9 has to be manufactured by casting or the like, and the cost is relatively high.

(Means for solving the problems) In view of these points, this proposal divides the shield into two parts, covers the contact piece from the outside, and supports it with a shield holder configured as a chrysanthemum seat for holding the contact piece. At the same time, the head of the fastener of the shield is set to be lower than the height of the outer surface of the shield. The purpose of this is to reduce the outer diameter of the shield and downsize the device without deteriorating the withstand voltage characteristics.

(Function) Since the shield is divided into two parts, it covers the contact from both sides, and is attached to the shield holding part that is part of the chrysanthemum seat for supporting the contact. The electric field can be relaxed because it is set to less than

(Example) The present invention will be explained below with reference to the drawings. FIG. 2 shows one embodiment of the present invention, and 21 is a shield.
This shield 21 is composed of shield pieces 22 and 23 that are divided into two in the axial direction, and are configured so that their joints are fitted together. As shown in FIG. 3, recessed holes 24 and 25 are provided at one location (or at two locations on opposing sides). 26 is a shield holding part, as shown in FIG.
1 piece of notch 3a (or 2 pieces on the opposite side)
After extending this part, as shown in Figure 3.
It is constructed by bending it 90 degrees. This shield holding portion 26 is provided with a hole 27 . Reference numeral 28 designates conductive fasteners such as blind rivets inserted into the holes 24, 25, and 27. Others 1st
The same reference numerals as in the figures indicate the same or corresponding parts.

Therefore, when assembling the one shown in FIG.
2 and 23 are brought to the center from the left and right and fitted together on the contact piece 1, and the recessed holes 24 and 25 are aligned with the hole 27 of the shield holding part 26, and a conductive fastener 28 such as a blind rivet is attached. The shield 21 is fixed to the holding part 26 by inserting it from the outside.
The head of the fastener 28 is connected to the shield 2 by the recess.
2, 23 or less. This device is fastened to the fixed conductor 6 with a bolt 7.

According to this embodiment, since the shield pieces 22 and 23 are placed over the contact piece 1 from the left and right sides, the ends 22a and 23a of the shield are made smaller than the maximum outer diameter of the contact piece 1, that is, the ends 22a and 23a of the shield are placed on the conductors 6 and 8. The radius of curvature can be increased in close proximity. Therefore, the electric field at the end of the shield can be relaxed, and the withstand voltage performance is improved. As a result, in the case of the same withstand voltage, the outer diameter of the shield can be made smaller than that of the conventional device, and the device can be downsized. Therefore, when used as a gas-insulated bus bar, etc., it means that the insulation distance can be increased if the diameter of the grounding container 11 is kept the same, and the diameter of the grounding container can be reduced if the withstand voltage is the same. Further, the shield 21 can be pressed and can be used to reduce costs. Furthermore, blind rivets 28
When the shield 21 is fixed to the holding part 26 by the above method, the potential of the shield 21 can be reliably fixed.

FIG. 5 shows another embodiment of the present invention, in which a blind rivet 2 is attached to the shield holding part 26 separately without fitting the two divided shield pieces 22 and 23 together.
8 and 29 are shown attached.

FIG. 6 shows the main part of yet another embodiment of the present invention,
A notch 61 is made in the chrysanthemum seat 3 as shown in FIG. 6B, and this is made to stand up as shown in FIG. 6A to form a shield holding portion. According to this embodiment, the diameter of the chrysanthemum seat 3 can be the same as the conventional one.

Although the shield 21 has been described above as being divided into two parts by cutting along a plane perpendicular to the longitudinal axis, it goes without saying that the shield 21 may also be cut along a plane along the longitudinal axis.
In this case, it goes without saying that care must be taken to ensure that the outer surface of the joint portion of the shield piece has a smooth curved surface that does not disturb the electric field.

(Effect of the invention) As detailed above, according to the present invention, the shield is divided into two parts, and a shield holding part is formed on the chrysanthemum seat as a support for supporting the contact piece, and the shield holding part is supported there, and the shield is fastened. Since the head of the shield is set to be lower than the height of the outer surface of the shield, the outer diameter of the shield can be reduced without deteriorating the withstand voltage performance. In addition, it is possible to utilize a press-formed shield.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a conventional device, Fig. 2 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is a partial side view of Fig. 2. , 5th
The figure is a longitudinal cross-sectional view showing only the main parts of another embodiment of the present invention, and Figure 6 shows only the main parts of another embodiment of the present invention, where A is a partial longitudinal cross-section and B is a chrysanthemum showing the manufacturing process. It is a partial front view of a seat. 1: Contact piece, 3, 4: Chrysanthemum seat, 3a, 4a: Notch, 6, 8: Conductor, 21: Shield, 26:
Shield holding part.

Claims (1)

[Scope of utility model registration request] In a device that accommodates and receives contact pieces that bridge conductors in notches equally spaced on the circumference of two chrysanthemums whose tips are separated, at least one of the chrysanthemums One notch is removed and a shield holding part with a hole is formed at the tip of this part, and a shield divided into two parts, each having a hole with a recess, is brought into contact with the shield support part, and the hole in the shield and the shield support part are brought into contact with each other. fixing the shield to the shield support part by inserting a fastener into a hole in the part;
A contact device with a shield, characterized in that the head of the fastener is lower than the height of the outer surface of the shield.