JPS605487Y2 - vacuum switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum switch, and particularly to improvements in its main circuit conductive portion.

The main circuit conductive part of a conventional vacuum switch is as shown in FIG. 1, and consists of a main circuit terminal 7' attached to an insulator tube 5' and a movable conductor 10' connected to a movable contact of a vacuum valve (not shown). The connection was made by a lead wire 1 having compatibility.

However, when the main circuit terminal and the movable conductor are connected by lead wires in this way, the diameter of the insulator tube 5' is changed to maintain a distance between the slack lead wire 1 and the inner surface of the insulator tube 5' as shown in the figure. This had the disadvantage of increasing the size of the paddle.

Furthermore, the conventional main circuit terminal includes a body part 7a' that passes through the mounting hole of the tube, a nut 7g' that is screwed into a screw provided on the outer periphery of this body part 7a', and a nut 7g' that protrudes from the body part 7a'. and an external terminal 7c' screwed onto the threaded part 7h', which is attached to the insulator tube 5' via the backing p, which not only increases the number of parts and increases the cost, but also increases the cost of the external terminal 7c. There is a drawback that the protrusion dimension from the end face of the bulge tube 5' becomes large, and the axial dimension of the vacuum switch becomes large.

In addition, in order to eliminate lead wire 1,
No., Jitko No. 52-49086, Jitko No. 51-5028
No. 3 and Japanese Patent Publication No. 44-28216, it has been proposed that the movable conductor of the vacuum valve and the main circuit terminal are connected by a sliding joint that fits into each other so as to be able to slide freely. However, in conventional vacuum switches of this type, a tulip-shaped contact as a fixed contact is attached to the main circuit terminal, and the main circuit terminal is screwed to a metal fitting fixed inside the hole. Ta.

However, the tulip-shaped contact has a structure in which a large number of finger-shaped contact pieces are arranged in an annular shape and is biased from the outside by a contact pressure spring, so the structure is complicated and difficult to assemble, and the contact pressure spring is not required. Therefore, it was inevitable that the outer diameter would increase and the radial dimension near the main circuit terminal would increase.

Furthermore, in conventional vacuum switches of this type, the main circuit terminal with the tulip contact attached had to be screwed from the outside to a metal fitting installed in the pipe, which increased the number of locations that needed to be kept airtight. This has the disadvantage that the number of parts increases and the structure becomes complicated.

In addition, in the above-mentioned conventional vacuum switch, it is possible to install the main circuit terminal integrally with the metal fitting that fixes the tube to the hole, but in this case, the tube is not fixed to the hole. It is necessary to assemble and attach the tulip contact in the space inside the metal fitting.

However, it is difficult to assemble the tulip contact in a narrow space due to its structure, so in this case, the diameter of the hole and the diameter of the metal fitting fixed to the hole must be increased to install the tube. Therefore, it is necessary to secure a large space inside the metal fitting, which inevitably increases the radial dimension of the vacuum switch.

Generally, in a vacuum switch, an insulating cylinder for driving the vacuum valve arranged to surround the vacuum valve and a spring holder provided on the insulating cylinder to receive the contact pressure spring and the shutoff spring of the vacuum valve are two members. The vacuum valve is operated by displacing the movable conductor by operating the insulating cylinder from the outside through an appropriate mechanism, and when opening the vacuum valve, the operating force of the disconnected cylinder is used. must be transmitted to the movable conductor of the vacuum valve.

However, in conventional vacuum switches, in order to transmit the operating force of the insulating tube for driving the vacuum valve to the movable conductor of the vacuum valve, a special member is attached to the movable conductor, and the spring retainer is brought into contact with the movable conductor. As a result, the number of parts was large and assembly was time-consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum switch that has a simple structure, a reduced number of parts, and a reduced axial and radial dimension.

In this invention, in order to achieve the above object, a female movable contact is provided on the movable conductor side of the vacuum valve, and a female cylindrical fixed contact that approaches and separates from the movable contact is provided on the main circuit terminal side. The two are brought into sliding contact.

The movable contact consists of a self-cutting contact type sliding contact that has a structure in which the peripheral wall of a bottomed cylindrical body with a screw hole is provided at the bottom and an axial slot, and the screw of the sliding contact A screw at the tip of the movable conductor is screwed into the hole to couple the sliding contact and the movable conductor.

In addition, when attaching the terminal to a paddle tube, the main circuit terminal integrally has a body portion passing through the hole, an external terminal projecting to the outside of the tube, and a cylindrical contact portion constituting the fixed contact. The terminal mounting is fixed in the hole with cement.

Furthermore, the end face of the movable contactor is a contact surface against which a member comes into contact when opening the vacuum valve, and the operating force of the insulating tube for driving the vacuum valve can be transferred to the movable conductor without the need for a special member. It is now possible to communicate.

If the fixed contact provided on the main circuit terminal side is formed into a cylindrical shape as described above, the structure of the main circuit terminal can be made very simple in combination with the integral structure of the main circuit terminal. In addition to simplifying the attachment of the main circuit terminal, it is possible to reduce the radial and axial dimensions of the vacuum switch.

In addition, by making the main circuit terminal into an integral structure and fixing it to the cement tube as described above, the number of parts to maintain airtightness can be reduced, simplifying the structure and increasing reliability. can.

Furthermore, if the movable contact coupled to the movable conductor of the vacuum valve is a self-blade contact type as described above, there is no need to assemble the movable contact, and the attachment of the movable contact to the movable conductor is a movable contact type. This can be done simply by screwing the screw at the tip of the movable conductor into the screw hole at the bottom of the child, which simplifies assembly.

Further, since the self-blade contact type sliding contact does not use a contact pressure spring, its outer diameter can be made small.

Therefore, it is possible to prevent the radial dimension of the vacuum switch tube from increasing and to downsize the vacuum switch.

In addition, as mentioned above, if the end face of the movable contact on the vacuum valve side is the contact surface that the insulating tube comes into contact with when opening the vacuum valve, a special member is used to transmit the operating force of the insulating tube to the movable conductor. Since there is no need to provide the same, the number of parts can be reduced and the structure can be simplified.

The present invention will be explained in detail below with reference to the illustrated embodiments.

FIG. 2 shows an embodiment of the present invention, in which 1 is a frame, and 2 and 3 are ring-shaped support plates fixed to the frame 1.

4 and 5 are insulator tubes that are in contact with the support plates 2 and 3, respectively, and are fixed to the frame 1;
and 5 are attached with main circuit terminals 6 and 7, respectively.

An insulating tube 8 for driving a vacuum valve is arranged in the space formed inside the insulator tubes 4, 5 and the frame 1, and this insulating tube 8 is slidably fitted to the inner peripheral surfaces of the support plates 2 and 3. There is.

A vacuum valve 9 with a fixed contact 9a and a movable contact 9b sealed in a vacuum container 9c and a fixed terminal 9d and a movable terminal 9e drawn out from both ends is housed inside the insulating tube 8, and the fixed terminal 9d of this vacuum valve is fitted into a hole 6b provided in the body portion 6a of the main circuit terminal 6.

A movable conductor 10 is connected to a movable terminal 9e of the vacuum valve 9 via a flanged joint 11.

The movable conductor 10 has a spring receiver fitted inside the insulating tube 8 near the end on the insulator tube 5 side, and a through hole 1 provided in the member 12.
It loosely penetrates through 2a and extends to the vicinity of the main circuit terminal 7, and is connected to the main circuit terminal 7 via the sliding contact 13.

A cutoff spring 14 is disposed between the member 12 and the container 9c of the vacuum valve 9, and the spring receiver is connected between the member 12 and the joint 1.
A contact pressure spring 15 is disposed between the flange portion 1 and the flange portion 1 .

The insulating cylinder 8 is also connected via a lever 17 to a main shaft 16 of an operating mechanism (not shown), and when the main shaft 16 is rotated counterclockwise in the drawing during the closing operation, the insulating cylinder 8 is displaced to the left in Fig. 2. Then, the movable contact 9b of the vacuum valve is brought into contact with the fixed contact 9a via the contact pressure spring 15.

In addition, during the tripping operation, the insulating tube 8 is displaced to the right in FIG. It is separated from the fixed contact 9a.

FIG. 3 shows in detail an example of the structure near the main circuit conductive part according to the present invention. The mounting bracket 1 is fixed by the cement 19 filled in the cylindrical part 18a.
It is fixed to 8.

Reference numeral 20 denotes a ring-shaped packing that is compressed and arranged between the mounting fitting 18 and the flange 5b of the insulator tube 5 to prevent the flow of cement.

A recess 18b is provided in the end face of the mounting bracket 18, and the above-mentioned support plate 3 is fitted into this recess.

An appropriate number of mounting holes 18 are provided in the flange portion of the mounting bracket 18.
C is provided, and the frame 1 is inserted through this mounting hole.
The insulator tube 5 is attached to the frame 1 by bolts (not shown) that are screwed into the frame 1.

A terminal attachment hole 5C is provided at the end of the insulator tube 5 opposite to the attachment fitting 18.

The main circuit terminal 7 integrally includes a body portion 7a that passes through the terminal attachment hole 5c of the insulator tube 5, a flange 7b that faces the open end surface 5d of the terminal attachment hole 5c, and an external terminal portion 7c that protrudes to the outside. The external terminal portion 7c is provided with a hole 7d through which a bolt for attaching a terminal fitting passes.

Further, a cylindrical contact portion 7e constituting a fixed contact is protruded from the end of the body portion 7a.

The body 7a of the main circuit terminal is fitted into the terminal attachment hole 5c of the insulator tube 5, and the ring-shaped member 21 is fitted to the end of the body 7a on the flange 7b side.

A ring-shaped packing 22 is further arranged on the outside of the member 21, and the member 21 and the packing 22 are arranged in a recess 7f provided in the flange 7b, so that the flange 7b and the bushing 5
is pressed into contact with the end surface 5d.

The terminal attachment hole 5C of the insulator tube 5 is filled with cement 19, and the main circuit terminal 7 is hermetically fixed to the insulator tube 5 by this cement.

The gasket 22 is for maintaining airtightness and is usually made of nitrile rubber or the like.

Further, the ring-shaped member 21 is made of a resin such as polyacetal that does not deteriorate even if it comes into contact with the cement 19, and this member 21 prevents the cement 19 from touching the packing 22, thereby preventing the packing from being deteriorated by the cement. There is.

The ring-shaped member 21 also has a function as a spacer that maintains a gap d between the flange 7b and the end surface 5d of the insulator tube 5. By maintaining the gap d in this way, the flange 7b is caused to open due to thermal expansion. This prevents the pipe 5 from being pressed and destroyed.

On the other hand, the end of the movable conductor 10 connected to the movable contact of the vacuum valve has a structure in which the circumferential wall 13a of the bottomed cylinder is provided with axially extending splits 13b at equal intervals to give elasticity to the circumferential wall. A self-blade contact type sliding contact 13 is attached.

In the illustrated example, a threaded portion 10 a is provided at the end of the movable conductor 10 , and this threaded portion is screwed into a threaded portion 13 c provided at the bottom of the sliding contact 13 . The sliding contact 13 and the movable conductor 10 are fixed to each other by tightening a holding plate 23 disposed on the bottom surface with a bolt 24 screwed into the end of the movable conductor.

A protrusion 13d is formed inside the tip of the sliding contact 13, and the contact portion 7e of the main circuit terminal 7 is inserted into the sliding contact 13 so as to be in slidable contact with this protrusion. ing.

In the embodiment shown in FIG. 2, the structure of the main circuit conductive part on the insulator tube 4 side is the same as the structure of the main circuit conductive part on the insulator tube 4 side, except that the fixed terminal 9d of the vacuum valve is directly fixed to the main circuit terminal 6 without using a sliding joint. It is almost the same as that shown in Figure 3.

When the movable conductor connected to the movable contact of the vacuum valve is connected to the main circuit terminal by the sliding joint as described above, the distance between the sliding joint and the inner surface of the insulator tube 5 can be increased, so that the The diameter of the tube 5 can be reduced.

Further, since the main circuit terminal 7 is made into an integral structure and is fixed to the pipe with cement, the number of parts is reduced, and the number of assembly steps is reduced.

Furthermore, since there is no screw joint between the body portion 7a of the main circuit terminal and the external terminal portion 7c, the protrusion length of the external terminal portion 7c can be shortened.

In the embodiments described above, the main circuit terminal 7 may be manufactured by integral molding, or may be manufactured by integrating a plurality of members by welding or the like.

As described above, according to the present invention, the fixed contact provided on the main circuit terminal side is formed into a cylindrical shape, which, together with the integral structure of the main circuit terminal, simplifies the structure of the main circuit terminal. This makes it possible to simplify the attachment of the main circuit terminals and to reduce the radial and axial dimensions of the vacuum switch.

In addition, since the main circuit terminal has an integral structure and is fixed to the tube with cement, the number of parts to be provided with an airtight structure can be reduced, and the structure can be simplified and reliability can be improved.

Furthermore, in the present invention, the movable contact coupled to the movable conductor of the vacuum valve is made of a self-blade contact type sliding contact, and there is no need to assemble the movable contact, so the number of assembly steps can be reduced. can.

Moreover, since the movable contact can be attached to the movable conductor by simply screwing the screw at the tip of the movable conductor into the screw hole at the bottom of the movable contact, assembly can be simplified.

Further, since the self-blade contact type sliding contact does not require a contact pressure spring, its radial dimension can be reduced, and the radial dimension of the pipe can be prevented from increasing.

Furthermore, since the end surface of the sliding contact constituting the movable contact on the vacuum valve side is the contact surface against which the spring receiver comes into contact when opening the vacuum valve, the operating force of the insulating tube is transmitted to the movable conductor. There is no need to provide a special member for this, and there is an advantage that the number of parts can be reduced and the structure can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of the main circuit conductive part of a conventional vacuum switch; Fig. 2 is a sectional view showing an embodiment of the present invention;
The figure is an enlarged sectional view showing the main parts of an embodiment of the present invention. 5...Insulator tube, 7...Main circuit terminal, 7
a...Body part, 7c...External terminal part, 7
e...Contact part, 9...Vacuum valve, 1
0...Movable conductor, 13...Sliding contact, 19...Cement.

Claims (1)

[Scope of utility model registration request] a paddle tube; a vacuum valve disposed within the paddle tube; a movable conductor coupled to a movable contact of the vacuum valve; a fixed contact coupled to the main circuit terminal; a movable contact coupled to the movable conductor to move toward and away from the fixed contact; and a vacuum disposed inside the pipe so as to surround the vacuum valve. In a vacuum switch comprising an insulating cylinder for driving a valve, and a spring support member that is attached to the insulating cylinder and receives and receives a contact pressure spring and a cutoff spring of the vacuum valve, the movable contact has a screw on the bottom. It consists of a self-blade contact type sliding contact having a structure in which an axial cut is made in the peripheral wall of a bottomed cylindrical body provided with a hole, and a screw hole of the sliding contact is provided at the tip of the movable conductor. The movable conductor and the sliding contact are connected to each other by screwing together the movable conductor and the sliding contact. The terminal mounting of the tube is fixed to the hole with cement, and the end face of the sliding contact on the vacuum valve side is fixed to the hole when the vacuum valve is opened. The vacuum switch is characterized in that the spring receiver serves as a contact surface against which a member comes into contact.