JPH01320720A - Vacuum switch tube - Google Patents

Abstract

PURPOSE:To reduce material cost and processing cost for a vacuum switch tube and facilitate installation to equipment by forming vacuum switch tube elements for plural phases in one insulating plate. CONSTITUTION:A fixed side metallic vessel 6 and a movable side metallic vessel 7 are arranged coaxilly with each conductor 2 and 5 and contacts 3 and 4, and each end is joined in vacuum and air-tightly with an insulating plate 1, whereby they form three independent vacuum chambers. And using screws provided for each fixed conductor 2 for three phases, each conductor 2 is fixed to an opening/closing equipment main body, respectively, and using screws provided for each movable conductor 5, each conductor 5 is connected to the driving part of the vacuum opening/closing equipment. Also, each conductor 2 and 5 is connected to each phase of each main circuit so as to form a three-phase electric path. By inputting signals into the driving part of the vacuum opening/closing equipment, each conductor 5 shifts to open or close almost at the same time and turns on or turns off the three-phase electric path.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum switch tube used in vacuum switchgear such as vacuum circuit breakers and vacuum contactors.

[Conventional technology]

FIG. 4 is a vertical cross-sectional view showing a conventional vacuum switch tube disclosed in, for example, Japanese Patent Application Laid-Open No. 57-17526. A fixed conductor that is vacuum-tightly bonded at the through hole,
3 is a fixed contact, 4 is a movable contact, and 5 is a movable conductor. 1
0 is a cylindrical metal container whose one end is vacuum-tightly connected to the insulating plate 1, 8 is a bellows for driving the movable contact 4 and the movable conductor 5, and 9 is a cylindrical metal container whose one end is vacuum-tightly connected to the insulating plate 1. 9 is a bellows for driving the movable contact 4 and the movable conductor 5; This is a shield to suppress the amount of adhesion.

Insulating plate 1. Metal container 10. The bellows 8 and the like constitute an airtight vacuum container, and the fixed contact 3 and the movable contact 4 are placed in a high vacuum.

Next, the operation will be explained. When using vacuum switch tubes in vacuum switching equipment such as vacuum circuit breakers and vacuum contactors,
The fixed conductor 2 is fixed to the vacuum switch main body (not shown) using the screw (not shown) provided on the fixed conductor 2 of the vacuum switch tube, and the screw (not shown) provided on the movable conductor 5 is used to fix the fixed conductor 2 to the vacuum switch main body (not shown). (not shown) to connect the movable conductor 5 to the vacuum switch drive unit (
(not shown). Further, the fixed conductor 2 and the movable conductor 5 are each connected to the main circuit to form an electric path.

By inputting a signal to the drive section of the vacuum switch, the movable conductor 5 moves to open and close, thereby turning on and off the electric circuit.

Vacuum switches are commonly used in three-phase circuits.

Since the conventional vacuum switch tube has one configuration, one vacuum switch tube serves one phase, three vacuum switch tubes are required for one vacuum switch.

[Problem to be solved by the invention]

Conventional vacuum switch tubes are constructed as described above, so when used in a three-phase circuit that is used inside the shell, it is necessary to use three vacuum switch tubes for each switching device, and the vacuum The problem was that it required the cost of three switch tubes.

Furthermore, when attaching the vacuum switch tube to the switching equipment, there was a problem in that each of the three phases had to be attached separately.

This invention was made in order to solve the above-mentioned problems, and the purpose is to form three vacuum switch tubes into an integrated three-phase switch tube, and to obtain a vacuum switch tube that can be made at a lower price. shall be.

[Means to solve the problem]

The vacuum switch tube according to the present invention comprises a plurality of switch tube elements arranged in a vacuum vessel, each independently of the other, so that their contacts can be brought into contact and separated from each other, and integrated with a single insulating plate for a multi-phase vacuum. It is formed into a switch tube.

[For production]

In the vacuum switch tube according to the present invention, a plurality of vacuum switch tube elements are formed into an integrated multi-phase vacuum switch tube by a single insulating plate, so the material cost and processing cost of the vacuum switch tube are reduced. At the same time, attachment to equipment becomes easy.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a ceramic insulating plate, 2 is a fixed conductor that is vacuum-tightly bonded to a cylindrical fixed side metal container 6, 3 is a fixed contact that is bonded and fixed to the fixed conductor 2, and 4 is bonded to a movable conductor 5. The fixed movable contact 7 is a cylindrical movable side metal container that is vacuum-tightly connected to the bellows 8.

One ends of the fixed metal container 6 and the movable metal container 7 are each connected to the insulating plate 1 in a vacuum-tight manner.

Reference numeral 9 denotes a shield for suppressing the amount of contact evaporation material adhering to the surface of the insulating plate 1.

Three through holes are bored in one insulating plate 1, and a fixed conductor 2 and a movable conductor 5 are formed along the central axis of each through hole.
and a fixed contact 3. fixedly bonded to the tip of each of these conductors.
A movable contact 4 is arranged.

A cylindrical shield 9 is used to cover the contact area between the fixed contact 3 and the movable contact 4.
is covered.

Fixed side metal container6. The movable metal container 7 is arranged concentrically with each conductor and contact, and one end of each is tightly connected to the insulating plate 1 under vacuum, thereby forming three independent vacuum chambers. Since the distance between the three metal containers varies depending on the voltage conditions of the circuit used, the insulating plate 1 is used to ensure the necessary distance.

Furthermore, the axial lengths of the fixed metal container 6 and the movable metal container 7 are made to be approximately the same, so that the position of the insulating plate 1 is approximately in the middle of the entire vacuum switch tube.

Next, the operation will be explained. When the vacuum switch tube according to the present invention is used in a three-phase vacuum switchgear, screws (not shown) provided on each of the three fixed conductors 2 are used to open and close each fixed conductor 2. Each movable conductor 5 is connected to the drive part of the vacuum switch (not shown) using screws (not shown) provided on each movable conductor 5. do. Also, each fixed conductor 2
' and each movable conductor 5 is connected to each phase of the main circuit, forming a three-phase electric circuit. By inputting a signal to the drive section of the vacuum switch, each movable conductor 5 moves almost simultaneously to open and close in conjunction with the operation of the drive section, thereby turning on and off the three-phase electric circuit.

Furthermore, the insulating plate 1 is positioned approximately in the middle of the axial length of the vacuum switch tube by making the lengths of the fixed metal container 6 and the movable metal container 7 almost the same. This is to provide mechanical strength during handling and opening/closing. Further, such a structure prevents the main circuit wiring and the opposing charging portion from coming close to each other. For example, in a conventional vacuum switch tube, as shown in FIG. 4, there is a possibility that the wiring connected to the fixed conductor 2 and the metal container 10 of the movable charging section are close to each other.

Fixed contacts for each phase of three phases3. Since the movable contacts 4 are each housed in an independent vacuum container, even if the negative phase loses its vacuum seal and vacuum deteriorates, as long as the other two phases remain vacuum-tight, the three-phase It will not develop into a short circuit. Therefore, it is also possible to subsequently perform the switching on and off of the three-phase electric circuit.

Generally, the main circuit of a three-phase vacuum switchgear is often arranged so that the axis center line of each of the three phases is a straight line. Therefore, the vacuum switch tube of the present invention is also arranged such that the vacuum switch tubes for each phase are connected in series so that the axis center line connecting the three phases is a straight line, as shown in FIG.

In addition, in the above embodiment, the structure of the vacuum switch tube is explained in which the main circuit arrangement of the vacuum switch is adapted to three phases in which each phase is arranged in a straight line. However, for example, when it is desired to shorten the width In some cases, the phase axis is divided into equal triangular parts so that the centers of the respective phase axes are separated by 120 degrees. In this case, as shown in FIG. 3, the vacuum switch tube according to the present invention is also divided into equal triangular parts so that the centers of the axis of each phase are separated by 120 degrees, thereby making it easier to attach the tube to the switching equipment.

In addition, in the above embodiment, a three-phase case was explained, but
When used in a vacuum switchgear with multiple phases other than three-phase, the number of metal containers and other components disposed on one insulating plate 1 may be changed in accordance with the required number of phases.

〔Effect of the invention〕

As described above, according to the present invention, vacuum switch tube elements for multiple phases each having a contact member arranged in an independent vacuum chamber are formed into an integrated vacuum switch tube for multiple phases using a single insulating plate. Therefore, the multi-phase vacuum switch tube can be made inexpensively, and it can be easily installed in a multi-phase vacuum switching device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a vacuum switch tube according to an embodiment of the present invention, FIG. 2 is a plan view of the vacuum switch tube, FIG. 3 is a plan view showing another embodiment of the invention, and FIG. The figure is a longitudinal sectional view showing a conventional vacuum switch tube. 1 is an insulating plate, 2 is a fixed conductor, 3 is a fixed contact, 4 is a movable contact, 5 is a movable conductor, 6 is a fixed metal container, and 7 is a movable metal container. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation

Claims (1)

[Claims] In a vacuum switch tube in which a circuit is turned on and off by the contact/separation operation of contacts in a vacuum container, a plurality of vacuum switch tube elements each having a plurality of vacuum switch tube elements disposed inside each independent vacuum container so that the contacts can be connected/separated are integrated. A vacuum switch tube characterized in that it is formed into an integrated multi-phase vacuum switch tube using two insulating plates.