JP2531048Y2 - High pressure vacuum electromagnetic contactor - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an opening / closing drive shaft extending in a horizontal direction, an operating lever extending horizontally from the opening / closing drive shaft in a direction perpendicular to the drive shaft, and a vertically extending direction perpendicular to the drive shaft from the opening / closing drive shaft. A movable iron core extending as a main movable member of the drive mechanism, the tip of the movable iron is sucked by the fixed iron core of the drive electromagnet to rotate the open / close drive shaft, and the rod-shaped movable contact of the vacuum valve is made at the tip of the operation lever. The present invention relates to a high-pressure vacuum electromagnetic contactor configured to drive a child in a closed circuit in an axial direction thereof, and particularly to simplification of an open / close display means for displaying an open / closed state of a vacuum valve.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of the structure of a conventional high-pressure vacuum electromagnetic contactor of this kind. FIG. 3 is a front view of the high-pressure vacuum electromagnetic contactor, and FIG. 4 is a side view.

A high-pressure vacuum electromagnetic contactor (hereinafter also simply referred to as an electromagnetic contactor) has a control circuit section 2 in which a low-voltage control / auxiliary circuit is housed outside a right end of a frame 1 made of an insulating material. Inside, a vacuum valve 9 constituting a current switching unit and a drive mechanism for driving the vacuum valve 9 to open and close are provided. Main circuit terminals 4A and 4B extend rearward from the vacuum valve 9, and an external circuit is connected to the main circuit terminals 4A and 4B. On the other hand, the driving mechanism includes an opening / closing drive shaft 3 extending in the horizontal direction and having a rectangular cross section and, as shown in FIG. 5, being bolted to the flat lower surface of the opening / closing drive shaft 3 having a rectangular cross section and moving horizontally to the vacuum valve 9 side. Operation lever 6 extending, opening / closing drive shaft 3
And a plate-shaped movable core 7 bolted to the flat front surface and extending vertically downward as a main movable member. When a current is applied to the coil 10B of the driving electromagnet 10 when the electromagnetic contactor is closed, the attracting force acts between the fixed core 10A and the movable core 7, and the movable core 7 is attracted in the direction of the fixed core 10A.
The opening / closing drive shaft 3 is rotated in a counterclockwise direction, and the operating lever 6 pushes up the rod-shaped movable contact 9A of the vacuum valve 9 at its distal end to make contact with a fixed contact (not shown) in the vacuum valve 9. Here, the rod-shaped movable contact 9A and the operation lever 6
A flower pot-shaped member 16 interposed between the movable contact 9A and the lower end of the movable contact 9A is screwed into a metal block embedded in the insulator. A metal rod extends downward from the lower part of the bracket, and the driving force of the operation lever 6 is transmitted to the movable contact 9A via a spring 18 guided in the direction of expansion and contraction by the metal rod.

At this time, the open / close state of the vacuum valve 9 is shown in FIG.
3 shows an opening / closing hand 5 attached to the lower surface of an opening / closing drive shaft 3 having a rectangular cross section and having a leading end bent into an L-shape to form a hand, and a state attached to the front of the control circuit section 2 shown in FIG. It is displayed by the open / close display means including the display nameplate 11, and when the circuit is closed, the pointer portion of the open / close pointer 5 points to the lower half display "closed" of the status display nameplate 11, and when the circuit is open, it indicates the upper half display "open circuit". .

[0005]

Conventionally, in a high-pressure vacuum electromagnetic contactor, the opening and closing life of the main body excluding the control circuit section is 2 years.
Since it is as long as 500,000 times, the movable member in the drive mechanism has a sufficient margin in strength, and has a structure and a shape in which stress concentration is avoided to extend the service life.
It is relatively expensive in terms of cost and requires one rank higher in terms of performance and reliability than the one with a life of about 10,000 operations. In addition, the use of members that are difficult to work with or require special attention during work is inevitable. This applies not only to the movable member that transmits the driving force but also to the opening / closing display unit that does not transmit the driving force. Because of the necessity of reducing the thickness, a thin plate material is used, and the mass corresponding to the length from the open / close drive shaft to the status display nameplate becomes a load applied to the mounting portion to the open / close drive shaft. For this reason, even a seemingly simple member requires a considerable cost to manufacture it by providing a structure for providing strength and having a long life.

An object of the present invention is to provide a high-pressure vacuum electromagnetic contactor in which the cost required for the configuration of the long-life open / close display means is significantly reduced.

[0007]

In order to solve the above-mentioned problems, in the present invention, an opening / closing drive shaft extending in a horizontal direction, an operating lever extending horizontally from the opening / closing drive shaft in a direction perpendicular to the drive shaft, and A movable iron core extending vertically from the opening / closing drive shaft in a direction perpendicular to the drive shaft is provided as a main movable member of the drive mechanism, and the distal end of the movable iron core is attracted by the fixed iron core of the drive electromagnet to rotate the open / close drive shaft, thereby performing an operation. A high-pressure vacuum electromagnetic contactor configured to drive the rod-shaped movable contact of the vacuum valve in the axial direction at the tip end of the lever in a closed circuit manner, wherein the operating lever extends horizontally from the opening / closing drive shaft also to the anti-vacuum valve side, The valve side may be an electromagnetic contactor constituting an opening / closing indicator for indicating the opening / closing state of the vacuum valve, or an auxiliary switch for opening / closing a low-pressure control / auxiliary circuit of the high-pressure vacuum electromagnetic contactor may be opened / closed. A plate-shaped lever which is assumed to be an electromagnetic contactor stuck arrow nameplate plate-like lever, or which serve as the opening and closing guide and a mark is fixed to the movable iron core.

[0008]

With the opening / closing pointer formed by extending the operation lever toward the anti-vacuum valve side of the opening / closing drive shaft, the mounting portion of the operation lever to the opening / closing drive shaft makes the large-mass movable contact of the vacuum valve resist spring force. Has the necessary strength to bring it to the final contact state, so that even if the mass corresponding to the length reaching the position of the status display nameplate on the By appropriately forming the parts and the like, it is possible to configure an opening / closing pointer part that does not cause a problem in strength or life in the attachment part. Therefore, a special opening / closing guide, unlike the conventional case, is not required, and the cost for the opening / closing display means can be greatly reduced.

Further, in the case where the plate-shaped lever for driving the auxiliary switch to open and close also serves as an opening / closing pointer, the plate-shaped lever itself has a structure and strength to withstand a life of 2.5 million times. The lever itself serves as an opening / closing indicator only by sticking an arrow nameplate or marking on the, and no separate opening / closing indicator is required, thereby further reducing the cost for configuring the opening / closing display means.

[0010]

FIG. 1 shows a first embodiment of the present invention. This embodiment shows an embodiment of the first means in the above [Means for Solving the Problems]. In the drawing, the same members as those in FIG. 5 are denoted by the same reference numerals.

An operating lever 12 according to the present invention is mounted on the lower surface of the opening / closing drive shaft 3 having a rectangular cross section. The operating lever 12 extends from the opening / closing drive shaft 3 to the vacuum valve 9 side to transmit a driving force to a movable contact (9A in FIG. 4) of the vacuum valve 9 and an opening / closing display nameplate of the control circuit unit 2. 11 (see FIG. 3) to form an opening / closing pointer.
It is formed from a single plate.

When a current is applied to the coil 10B of the driving electromagnet 10 when the electromagnetic contactor is closed, the movable iron core 7 is attracted by the fixed iron core 10A and the opening / closing drive shaft 3 rotates counterclockwise in FIG. Then, the movable contact (9A in FIG. 4) of the vacuum valve 9 is driven upward in the axial direction at the tip of the operation lever 12. At this time, the arm 12b moves to the position indicated by the solid line in FIG.
Refers to "closed circuit". At the time of opening, the tripping device of the drive mechanism (not shown) operates, the link mechanism holding the open / close drive shaft 3 in the closed state is broken, the operation lever 12 returns to the position indicated by the one-dot chain line, and the arm 12b is turned off. Display of status display nameplate 11: Indicates "open circuit".

FIG. 2 shows a second embodiment of the present invention. This embodiment shows an embodiment of the second means in the above [Means for Solving the Problems]. In this embodiment, as in the case of the conventional high-pressure vacuum electromagnetic contactor, the auxiliary switch 2A accommodated in the control
An L-shaped lever 8 made of a plate for opening / closing drive from the side is fixed to one side of the L-shape using bolts on a surface of a movable core 7 attached to the front surface of the opening / closing drive shaft 3 having a rectangular cross section. A short columnar boss fixed near the tip of the other side of the L-shape is inserted into a long hole of an operation lever integral with the operation shaft for driving the contact operation shaft of the auxiliary switch 2A to open and close. By moving this short columnar boss together with the movable iron core 7 in the vertical direction in FIG. 3B, the operation lever of the auxiliary switch 2A swings around the contact operation axis, and the auxiliary switch 2A opens and closes. Will be

Although not shown in detail here, the lever 8 is formed by bending both sides of the width and forming a round groove in the longitudinal direction in order to obtain necessary strength and life with a relatively thin plate material. Deformation such as formation of a concave portion is performed. Therefore, by attaching an arrow nameplate as shown in the figure or attaching a mark to the lever 8 and moving the lever 8 together with the movable iron core 7, the arrow of the nameplate or the mark changes to the state display nameplate 11.
(At this time, the amount of movement is slightly larger than the amount of movement of the bolt 17 that attaches the movable iron core 7 to the opening / closing drive shaft 3 in the direction parallel to the plane of the paper), according to the closing position or opening position of the electromagnetic contactor. Display of status display nameplate 11: Indicates "closed circuit".

[0015]

According to the present invention, since the high-pressure vacuum electromagnetic contactor is constructed as described above, the following effects can be obtained.

In the high pressure vacuum electromagnetic contactor according to the first aspect,
There is no need to separately manufacture an opening / closing indicator having a structure and strength that can withstand a long life and attach it to the opening / closing drive shaft as in the related art, so that the cost for configuring the opening / closing display means is greatly reduced.

In the high pressure vacuum electromagnetic contactor according to claim 2,
Attach the arrow nameplate to the lever that opens and closes the auxiliary switch,
Alternatively, the lever also serves as an opening / closing indicator only by adding a mark, thereby further reducing the cost for configuring the opening / closing display means.

[Brief description of the drawings]

FIG. 1 is a diagram showing the configuration of an open / close display means according to a first embodiment of the present invention, wherein FIG. 1 (a) is a side view and FIG.
Is the bottom view

FIGS. 2A and 2B are views showing a configuration of an open / close display means according to a second embodiment of the present invention, wherein FIG. 2A is a front view and FIG.
Is the bottom view

FIG. 3 is a front view showing a conventional configuration example of a high-pressure vacuum electromagnetic contactor to which the present invention is applied;

FIG. 4 is a side view showing a conventional configuration example of a high-pressure vacuum electromagnetic contactor to which the present invention is applied.

5A and 5B are diagrams showing a configuration example of a conventional open / close display means, wherein FIG. 5A is a side view and FIG. 5B is a bottom view.

[Explanation of symbols]

 2A auxiliary switch 3 opening / closing drive shaft 5 opening / closing guide 7 movable iron core 8 operating lever 9 vacuum valve 9A movable contact 10 drive electromagnet 11 status display nameplate 12 operation lever 14 arrow nameplate

Claims (2)

(57) [Scope of request for utility model registration] An open / close drive shaft extending in a horizontal direction, an operation lever extending horizontally from the open / close drive shaft in a direction perpendicular to the drive shaft, and a movable core extending vertically from the open / close drive shaft in a direction perpendicular to the drive shaft. Provided as the main movable member of the drive mechanism, the tip of the movable iron core is attracted by the fixed iron core of the drive electromagnet to rotate the open / close drive shaft, and the rod-shaped movable contact of the vacuum valve is moved in the axial direction at the tip of the operation lever. In a high-pressure vacuum electromagnetic contactor configured to drive in a closed circuit, the operating lever extends horizontally from an opening / closing drive shaft to an anti-vacuum valve side, and the anti-vacuum valve side constitutes an opening / closing indicator for displaying an open / closed state of the vacuum valve. High pressure vacuum electromagnetic contactor characterized by the above-mentioned. 2. A high-pressure vacuum electromagnetic contactor according to claim 1, wherein a plate-like lever for opening and closing an auxiliary switch for opening and closing a low-pressure control / auxiliary circuit of said high-pressure vacuum electromagnetic contactor is movable. A high-pressure vacuum electromagnetic contactor fixed to an iron core and having an arrow nameplate attached to the plate-like lever or having a mark to serve as an opening / closing pointer.