JPH0330225A - Vacuum switch tube - Google Patents

Abstract

PURPOSE:To prevent deterioration in withstand voltage characteristic of each contact by providing through holes on a moving electrode and on a guide so that direction pins that run perpendicular to each other in an axial direction, can be inserted therein at the same time, and thereby maintaining a moving contact and a fixed contact opened at the time of inserting the pin. CONSTITUTION:On a moving electrode 4 and on a guide 7A, through holes 11, 12 are provided so as to insert therein direction pins that run perpendicular to each other in an axial direction at the same time, while a moving contact 5 and a fixed contact 3 are maintained opened at the time of inserting the pin. Rubbing of the moving contact 5 and the fixed contact 3 with one another at the time of integrating a vacuum switch tube A into a switch gear main body, can be prevented for sure. withstand voltage characteristic of each contact 3, 5 is thus improved, and strict work control or withstand voltage aging after mounting is no more necessary.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a vacuum switch tube used in vacuum switching equipment such as vacuum circuit breakers and vacuum contactors. (Prior Art) FIG. 3 is a sectional view showing a conventional vacuum switch tube disclosed in, for example, Japanese Patent Application Laid-Open No. 56-42923. In the figure, A is a vacuum switch tube, 1 is a vacuum vessel, and 2 is a A fixed electrode is hermetically fixed to one end of the vacuum container 1; 3 is a fixed contact bonded to the inner end of the fixed electrode 2; 4 is a fixed contact that is hermetically supported to the other end of the vacuum container 1 via a bellows 6; A movable electrode 7 having a movable contact 5 at its inner end is a cylindrical guide fixed to the outside of the other end of the vacuum vessel l in order to guide the movable electrode 4 in the axial direction.

Fig. 4 shows a switch main body B such as a vacuum circuit breaker to which the vacuum switch tube A is attached, 8 is a fixed end plate (molded frame, etc.) that screws the fixed electrode 2 ends, and 9 is a movable A drive rod 10 screw-coupled to the outer end of the electrode 4 is a drive unit that operates the drive rod 9.

Next, the operation will be explained.

First, if a short-circuit accident or the like occurs and an excessive current flows in the current path connected to the vacuum switch tube A, the drive unit 10 pulls the drive rod 9, and the movable contact 5 is forcibly moved from the fixed contact 3 by 1:. separate. This opening operation is repeated several 10 times to tens of thousands of times depending on the current capacity.

By the way, since the vacuum chamber 1 of the vacuum switch tube A is maintained in a vacuum, the movable electrode 4 is always urged in the closing direction via the bellows 6 according to the pressure difference with atmospheric pressure, and each movable contact 5 and the fixed contact 3 continue to be in contact with each other, and this contact state is maintained even during the installation work of the vacuum switch tube A to the switch main body B.

[Problem to be solved by the invention]

Since the conventional vacuum switch tube is constructed as described above, when it is assembled into the switch main body B, the contacts 3.5 are in contact with each other, especially the drive rod 9 of the movable electrode 4. When connecting by screwing in each of these contacts 3
．． There were problems such as friction and wear between the contacts 3 and 5, which deteriorated the withstand voltage characteristics between the contacts 3 and 5. In addition, when trying to prevent such deterioration of withstand voltage characteristics,
This required very strict work management or voltage aging after installation, which caused problems such as a significant drop in productivity.

This invention was made in order to solve the above-mentioned problems, and by holding each contact in an open state during the installation work on the switch main body, it prevents friction and wear between each contact. The purpose of this invention is to obtain a vacuum switch tube that can reliably prevent deterioration of withstand voltage characteristics.

[Means to solve the problem]

In the vacuum switch tube according to the present invention, the movable electrode and the guide are provided with through holes into which directional pins perpendicular to the axial direction can be inserted at the same time, and when the pins are inserted, the movable contact and the fixed contact are in an open state. It was designed so that it could be maintained.

[For production]

The pin in this invention is designed so that the movable contact separates from the fixed contact when the movable electrode and guide are inserted into the through holes, thereby preventing the contacts from rubbing against each other when assembled to the switch main body. This prevents deterioration of the withstand voltage characteristics of each contact. [Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. 1st
In the figure, 7A is a movable electrode 4 fixed to the vacuum container 1.
A guide for guidance, 11 is a through hole drilled in the guide 7A in a direction perpendicular to the axial direction thereof, and 12 is a through hole bored in the movable electrode 4 in a direction perpendicular to the axial direction thereof. Each of these through holes 11, 12 is formed so that a gap 14 of a predetermined width is created between the fixed contact 3 and the movable contact 5 when pins 13 as shown in FIG. It has become.

Next, the operation will be explained. First, when attaching the vacuum switch tube A to the switch main body B, the fixed electrode 2 is attached to the fixed side end plate 8 of the switch main body B by tightening screws. Next, the movable electrode 4 is connected to the drive rod 9 of the switch main body B by screwing. Furthermore, when carrying out this work, pins 3 are inserted into each of the through holes 11 and 12 as shown in Fig. 2. Therefore, the fixed contact 3 and the movable contact 5 are maintained in an open state via the gap l4, and these contacts 35 are prevented from rubbing against each other. As a result, it is possible to prevent deterioration of the withstand voltage characteristics of each contact 3.5 as in the conventional case. Furthermore, if the value of the gap 14 when the pin 13 is inserted is set to be the same as the value of the specified gap when the vacuum switch tube A is used, then this vacuum switch tube A can be set to the switch body B.
Adjustment of the gap 14 after installation can be omitted.

Furthermore, after the installation to switch body B is completed, pin 1
By removing 3, the opening/closing operation can be performed automatically.

〔Effect of the invention〕

As described above, according to the present invention, the movable electrode and the guide are provided with through holes into which the directional pins perpendicular to the axial direction can be inserted at the same time, so that the movable contact and the fixed contact are opened when the pins are inserted. Since the vacuum switch tube was designed to be maintained in the separated state, when installing the vacuum switch tube into the switch body,
This has the effect of reliably preventing the movable contact and the fixed contact from rubbing against each other, thereby improving the withstand voltage characteristics of each of the contacts.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a vacuum switch tube according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the main part of Fig. 1, and Fig. 3 is a sectional view showing a conventional vacuum switch tube. FIG. 4 is a side view showing the switch main body to which the vacuum switch tube of FIG. 3 is attached. 1 is a vacuum container, 2 is a fixed electrode, 3 is a fixed contact, 4 is a movable electrode, 5 is a movable contact, 6 is a bellows, 7A is a guide, 1
1.12 is a through hole. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed electrode that is hermetically fixed to one end of the vacuum vessel and has a fixed contact at the inner end; and a movable electrode that is airtightly penetrated and supported by the other end of the vacuum vessel via a bellows and has a movable contact at the inner end. electrode and to guide this movable electrode.
In a vacuum switch tube including a cylindrical guide fixed to the outside of the other end of the vacuum container, the movable electrode and the guide are provided with a direction perpendicular to the axial direction when the movable contact and the fixed contact are in an open state. A vacuum switch tube characterized by having through-holes into which pins can be inserted at the same time.