JPS59203325A - Vacuum switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a vacuum switch that is used for wiring electrical circuits, has a pair of contacts in a vacuum container, and opens and closes the contacts by electromagnetic drive from the outside.

[Background technology]

As shown in Figure 1, a general vacuum switch has a pair of contacts 2 and 3 facing each other in a vacuum container 1 made of an insulator, and both contacts have a conductive wire that penetrates the side wall of the vacuum container 1 and is inserted into the container. The ends of the rods 4, 5 are fixed. The one conductive rod 4 is not shown. In this case, a bellows frame 6 is provided between the vacuum container 1 and the conductive rod 4, which can keep the inside of the container 1 airtight and allow the conductive rod 4 to move in the axial direction.

In the vacuum switch having such a structure, the contacts 2.3 are normally in the closed state, but in such a state, the operation mechanism (not shown) begins to move. This arc is maintained by the generation of metal vapor from the cathode, for example, the contact 5 side, and when the current reaches zero, the generation of metal vapor stops, the arc can no longer be maintained, and the interruption is completed.

In such a vacuum switch, a bellow flamm 6 is constructed between the vacuum container 1 and the movable conductive rod 4, so that the bellow flamm 6 also moves as the conductive rod 4 moves, so that the vacuum switch can be opened and closed. The mechanical life of the device was limited by the bellows 7 and the driving force of the conductive rod 4 increased, making it necessary to increase the size of the operating mechanism (not shown).

〔the purpose〕

The present invention has been made in view of the above points, namely, a plunger is configured to face a fixed side contact in a vacuum container and can freely move back and forth, and this plunger is magnetically driven from the outside. The purpose of this invention is to improve the mechanical life of the contact mechanism of a vacuum switch by forming a conductive path through a spring, and to reduce the size and power consumption of the operating mechanism.

[Disclosure of the invention]

(Example) One example of the present invention will be described based on FIG.
The container is a vacuum container made of an insulating material, has an airtight structure, and has a protrusion 10a on the side facing an electromagnetic device to be described later, on which the magnetic body of the plunger moves.

Reference numeral 11 denotes a fixed side contact, which is located inside the vacuum vessel 10 and is composed of a contact portion 11& and a conductive rod 11b, one end of which penetrates the vacuum vessel 1o and is led out to the outside. The penetrating portion fixes the two together so that the inside of the container can be kept airtight. 12 is a plunger, and one end is the fixed side contact 1
It has a movable side contact 12a facing 1H, and the other end is a magnetic body 1.
2b, which are connected by a conductive rod 12C. The magnetic body 12b is the protrusion 10 of the vacuum container 1o.
It is housed in the inner space of a so that it can move freely back and forth. Reference numeral 13 denotes a plate spring, one end of which is fixed between the conductive rod 12C of the plunger 12 and the magnetic body 12b as shown in FIG. It passes through and leads out to the outside.

This penetration part is fixed to be kept airtight within the container,
It serves as the fulcrum for the operation of the plate spring. Furthermore, the plate spring biases the force in the direction of the arrow X on the plunger No. 12, keeps the contact closed, and secures a predetermined contact pressure.
C, and when a voltage is applied to this coil 14C, the magnetic body 1'2b of the plunger 12 is magnetically driven. Further, the protrusion 10a of the vacuum vessel 1° is inserted into the through hole 14d of the coil frame 14b. These detailed views are shown in FIG. A permanent magnet 15 is disposed on the extension axis of the plunger 12 at a position opposite to the magnetic body 12b, and is also connected to the yoke 14 of the electromagnet device 14 on the same axis.
Al is stuck. Furthermore, the direction of magnetization is the same as the axis of the plunger 12.

(Operation) Next, the operation of the present invention will be explained based on FIG. 2. The figure shows the plunger 12 being attracted to the permanent magnet 15 and the contact being opened. Now, when a voltage is applied to the coil 14C to generate a magnetomotive flux B in the opposite direction to the magnetic flux direction A of the permanent magnet 15, the magnetic flux of the permanent magnet 15 is attenuated and the plunger 12
is no longer able to be held by suction and is opened, and is urged by a force in the direction of the arrow X by the leaf spring 13, bringing the movable contact 12a of the plunger 12 into contact with the fixed contact 11a, and the closing operation is completed. Next, by reversing the voltage application direction of the coil 14C and superimposing the magnetomotive flux by the coil 14C and the magnetomotive flux by the permanent magnet 15 in the same direction, an attractive force is created between the magnetic plate 12b of the plunger 12 and the permanent magnet 15. , the plunger 12 moves in the opposite direction to the arrow direction X, and the two are attracted to each other, resulting in the opening operation. Even after the coil 14C is de-energized, the permanent magnet 15 maintains the open state.

〔effect〕

As described above, the present invention comprises a plunger that can freely reciprocate in opposition to a fixed contact in a vacuum container, a magnetic plate in this plunger, and a plate spring that holds the contact closed and serves as an external conduction path. In addition, an electromagnetic device that magnetically drives the plunger from the outside and a permanent magnet that holds the plunger in the open position are configured, so the electrical path from the movable contact to the outside of the container can be made using a leaf spring. , compared to the conventional structure in which a bellows frame is constructed between a conductive rod having a movable side contact and a vacuum vessel, the mechanical opening/closing life is increased, and
The driving force required to open and close the contacts can be reduced, the operating mechanism can be downsized, and power consumption can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a conventional example, FIG. 2 is a sectional view of a main part of a vacuum switch of the present invention, and FIG. Figure 4 is a partially enlarged sectional view of the same left side. Patent applicant Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takemoto (and 2 others) Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A vacuum container, a fixed contact located inside the container and having one end led out to the outside, and a reciprocating plunger having one end as a movable contact facing the fixed contact and the other end having a magnetic material. , a leaf spring for keeping the contact closed and serving as an external lead-out electrical path, an electromagnet device for magnetically driving the magnetic plate of the plunger from outside the vacuum container, and a permanent magnet disposed at a position facing the magnetic plate of the plunger. A vacuum switch characterized by comprising: