JPH0799656B2 - Sealed contact device - Google Patents

Description

The present invention relates to a sealed contact device suitable for a relay for a power load, an electromagnetic switch, and the like.

[Conventional technology]

There is a conventional sealed contact device having the following structure, which will be described with reference to FIG.

Reference numeral 1 denotes a sealed container, and a body 1a formed of a heat-resistant insulating material such as ceramic, an end plate 1b formed of a metal material and fixed by closing one end of the body 1a in the axial direction and the axial direction. And a yoke 1c that closes the other end of the. Then, an electrically insulating gas such as hydrogen gas is sealed in a high pressure (for example, 2 atm) from a trachea 1f connected to cover a pore 1g formed in the yoke 1c, and then the trachea 1f is pressure-bonded to form an airtight space. The lead wire 1h is connected to the trachea 1f. The outer wall of the body 1a and the yoke 1c are arranged so that the pair of permanent magnets 1d face each other.
It is sandwiched between facing pieces.

A fixed electrode 2 is made of a metal material such as acid-free copper and has a base end fixed to the yoke 1c and a fixed contact 2a fixed to the tip thereof.

Reference numeral 3 denotes a movable electrode, which is formed of a metal material such as acid-free copper in a rod shape, and has a movable contact 3a fixed to the fixed contact 2a in the sealed container 1 at one end 3b thereof.

Reference numeral 4 denotes a terminal member, which is a cylindrical member having a flange portion 4a made of a copper alloy metal material in a radial direction orthogonal to the axial direction of the movable electrode 3, and is inserted into the other end 3c of the movable electrode 3 from the flange portion 4a side. The cylindrical portion 4b is fixed to the outer periphery of the other end 3c of the movable electrode 3. And, although not shown, the flange portion 4a
A conductor wire is connected to a part of an extension of the.

Reference numeral 5 denotes a cap, which is made of a metal or a synthetic resin material and has a bottomed cylindrical shape, and is fitted into the cylindrical portion 4b of the terminal member 4. Then, the spherical top 5a is pressed by a driving means (not shown), the movable electrode 3 is driven, and the movable contact 3a comes into contact with and separates from the fixed contact 2a.

Reference numeral 6 denotes a bearing, which is formed of a synthetic resin material in a substantially cylindrical shape, and the through hole serves as a guide when the movable electrode 3 is inserted and the movable electrode 3 operates, and the outer surface is orthogonal to the axial direction thereof. Has a holding portion 6a protruding in the radial direction.

Reference numeral 7 denotes a cylindrical portion, which is formed of a metal material in a cylindrical shape and surrounds the bearing 6 so that the movable electrode 3 can be inserted therethrough, and an end plate of the sealed container 1.
One end of the movable electrode 3 provided in 1b is hermetically coupled to the peripheral edge of the insertion hole 1e.

Numeral 8 is a bellows, which is formed in a bellows shape with a corrugated corrugation on a thin metal cylinder, one end of which is airtightly fixed to the movable electrode 3 near the peripheral edge of the insertion hole 1e formed in the end plate 1b, and the other end of which is It is airtightly fixed to the end portion of the tubular portion 7 by a bellows retainer 9 described later. Therefore, in detail, the airtight space of the sealed container 1 is configured together with the above-mentioned portion to maintain the airtightness.

Reference numeral 9 denotes a bellows retainer, which is made of a metallic material and has a disc-like shape having an inner hole, and the other end of the bellows 8 is sandwiched between the ends of the tubular portion 7 and airtightly fixed. The bearing 6 is inserted and positioned so that the outer surface thereof is closely attached to the inner hole of the bellows retainer 9.

Reference numeral 10 denotes a bearing retainer, which is formed in a disk shape by forming an inner hole made of a metal material and having a thick portion on the outer periphery, and the inner hole is closely attached to the outer surface of the bearing 6 to position the bearing 6 At the same time, a thick portion is fixed to the bellows retainer 9 so as to retain the bearing 6 by pressing the holding portion 6a of the bearing 6 together with the bellows retainer 9 in the axial direction.

Reference numeral 11 denotes a return spring, which has a coil shape, is surrounded by the movable electrode 3, and is disposed between the flange portion 4a of the terminal member 4 and the bearing retainer 10. When the movable electrode 3 operates and the flange portion 4a of the terminal member 4 compresses the return spring 11, the movable electrode 3 receives the return force.

Reference numeral 12 denotes a stopper, which is formed by providing a disk portion 12a having an insertion hole for the cap 5 and a counter leg piece 12b extending in mutually opposite directions with respect to the center of the disk portion 12a by a metal material. Flange 4a of terminal member 4 with a certain distance
A facing leg piece 12b is fixed to the tubular portion 7 or the bellows retainer 9 so as to face the.

Next, the operation will be described. When the pressing force of the non-illustrated driving means acts on the top portion 5a of the cap 5, the movable electrode 3 is guided and driven by the through hole of the bearing 6, and the movable contact 3a fixed to one end 3b of the movable electrode 3 becomes the fixed contact 2a. It closes and becomes conductive. Then, when the pressing force is removed, the movable electrode 3 is restored by the restoring force of the restoring spring 11 and the restoring force based on the pressure difference between the inside and outside of the sealed container 1, and the movable contact 3a is separated from the fixed contact 2a. The flange portion 4a of the terminal member 4 is the disk portion of the stopper 12.
The return position of the movable electrode 3 is regulated by contacting the 12a. In addition, the arc generated at the time of opening is extinguished by the cooling ability of the insulating gas sealed in the sealed container 1 at high pressure and the blow-off action of the arc moving by the Lorentz force based on the magnetic field created by the permanent magnet 1d. The long life and reliability of the contacts are improved.

[Problems to be Solved by the Invention]

In the above-mentioned conventional sealed contact device, the movable electrode 3 is restored by removing the pressing force of the driving means, and the flange portion 4a of the terminal member 4 contacts the disk portion 12a of the stopper 12 to move the movable electrode. When the return position of 3 is regulated, the rigid bodies directly collide with each other, and the collision acceleration at that time is large. Therefore, the bellows 8 fixed to the movable electrode 3 causes buckling and causes cracks. It was.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the collision acceleration and prevent malfunctions of the bellows when the movable electrode is returned and the return position is regulated by the stopper. An object is to provide a sealed contact device.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the sealed contact device of the present invention is a sealed container in which an airtight space is formed by sealing an electrically insulating gas inside, and a fixed electrode provided with a fixed contact at the tip,
A movable electrode having a movable contact at one end that contacts and separates from a fixed contact in a sealed container, a terminal member fixed to the other end of the movable electrode, a stopper that regulates the return position of the movable electrode, and the movable electrode are inserted. In a sealed contact device comprising a tubular portion and a bellows having one end fixed to a movable electrode and the other end fixed to a tubular portion, a protrusion is provided on the stopper, and the return position of the movable electrode is regulated. A cushioning member is provided between the terminal member and the protrusion so as to partially contact the protrusion and reduce the return speed of the movable electrode as the degree of contact increases.

[Action]

In the sealed contact device according to the present invention, the stopper is provided with the protruding portion, and the cushioning member is arranged between the terminal member and the protruding portion, so that the cushioning member can be projected before the movable electrode is restricted in the return position. Part of the movable electrode, and moreover, as the degree of contact increases, the return speed of the movable electrode is slowed down, so that the collision acceleration when the movable electrode is stationary due to its restricted return position is reduced. The fixed bellows does not buckle and crack.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In addition, the substantially same members as those in the conventional example are denoted by the same reference numerals, and only different points from the conventional example will be described.

The difference is that the structure of the stopper 12 and the cushioning member 13
Is attached.

The stopper 12 is provided with about eight protrusions 12c having a height of about 0.25 mm and a diameter of about 1 mm along the circumference on the inner side surface of the disk portion 12a.

The cushioning member 13 is formed of, for example, a silicon rubber material into a disk shape having a center hole, and the terminal member 4 is formed in the center hole.
The cylindrical portion 4b is inserted to be disposed between the flange portion 4a of the terminal member 4 and the protruding portion 12c of the stopper 12. And
Opposing leg pieces 12b of the stopper 12 are fixed to the tubular portion 7 or the bellows 8 so that the disk portion 12a of the stopper 12 and the cushioning member 13 face each other at a predetermined distance.

In such a sealed contact device, when the pressing force of the non-illustrated driving means is removed and the movable electrode 3 is restored by the restoring force of the restoring spring 11 and the restoring force based on the pressure difference between the inside and outside of the sealing container 1. First, the cushioning member 13 includes the protrusion 12 provided on the stopper 12.
Partially abuts c. That is, the cushioning member 13 has the protrusion 1
First, the tip portion of 2c comes into contact with the tip portion, and thereafter, the degree of contact with the tip portion of the protrusion 12c is gradually increased. However, the cushioning member 13 is made of a silicon-based rubber material, and as the degree of contact with the protruding portion 12c increases, the cushioning member 13 has a spring force that is closer to the property of a rigid body. The return speed of is gradually reduced. And finally, the restoring force of the movable electrode 3 and the buffer member 13
The return of the movable electrode 3 is regulated when the spring force is balanced, and the movable electrode 3 is stopped. However, the speed of the movable electrode 3 at that time is slowed by the above action. The collision acceleration is small.

By the way, the number of the protrusions 12c at this time is related to the collision acceleration. That is, if there is no protrusion 12c, the entire surface of the buffer member 13 contacts the surface of the disk portion 12a of the stopper 12, so that one strong spring determined by the buffer member 13 is acting. Then, since the movable electrode 3 is stopped immediately after the buffer member 13 contacts the stopper 12, the collision acceleration does not become small.

On the other hand, when there are a plurality of protrusions 12c, the cushioning member 13
The number of springs is distributed in parallel to the positions where each of the projections 12c abuts, but since the contact is partial, only the portion of the cushioning member 13 near the projections 12c contributes as a spring. Therefore, the spring at the position of each protruding portion 12c does not become one strong spring in which there is no protruding portion 12c evenly distributed to the number of protruding portions 12c. Will act as a much weaker spring. The spring force per protrusion 12c is weakest when the number is one, and becomes stronger as the number increases. Therefore, it becomes strongest when the number of protrusions 12c is extremely increased and extends over the entire surface of the cushioning member 13, but this also means that the entire surface of the cushioning member 13 contacts the stopper 12, and the total spring force thereof is projected. This is equivalent to the case where there is no part 12c. On the other hand, if the number is too small, the total spring force is too weak and the projection 12c becomes the buffer member 13.
Then, the entire surface of the buffer member 13 comes into contact with the stopper 12 as well. That is, in order to gradually reduce the returning speed of the movable electrode 3 to reduce the collision acceleration, there is an appropriate number of the protrusions 12c. However, the number of them depends on the shapes and materials of the protrusions 12c and the cushioning member 13, as well as the restoring force of the movable electrode 3 and so on, and therefore is determined according to the contents of each.

In the present embodiment, the relationship between the speed of the movable electrode 3 and the collision acceleration when the buffer member 13 contacts the protrusion 12c is shown in FIG.
FIG. 2 shows the number of 12c changed, and the collision acceleration is almost the same in the case of two protrusions 12c as in the case without the protrusions 12c. Since there is not much difference with eight, about eight is considered appropriate. Of course, even when only the buffer member 13 is provided without the protrusion 12c, the collision acceleration is much smaller than that in the case where the terminal member 4 directly collides with the stopper 12 as in the conventional example. I can confirm.

As described above, by providing the protrusion 12c on the stopper 12 and disposing the cushioning member 13 between the terminal member 4 and the protrusion 12c, the cushioning member 13 is provided before the movable electrode 3 is regulated in the return position. Partially abuts the protruding portion 12c, and further, as the degree of abutment increases, the return speed of the movable electrode 3 slows down, so that the collision acceleration when the movable electrode 3 is restrained at its return position and becomes stationary becomes small. , Therefore the movable electrode 3
This eliminates the problem that the bellows 8 fixed to the wall buckles and cracks.

In addition, in the present embodiment, the stopper 12 is provided with a plurality of protrusions 12c over the circumference on the inner side surface of the disc portion 12a, but instead of the protrusion 12c, the disc portion is also formed. A similar effect can be achieved by providing one strip-shaped protrusion over the circumference on the inner surface of 12a.

〔The invention's effect〕

Since the sealed contact device of the present invention is configured as described above,
By providing the stopper with the protrusion and disposing the cushioning member between the terminal member and the protrusion, the cushioning member partially abuts on the protrusion before the return position of the movable electrode is regulated, and Since the return speed of the movable electrode is slowed down as the contact degree increases, the collision acceleration when the movable electrode is stationary at the return position is restricted, and therefore the bellows fixed to the movable electrode buckles. This eliminates the problem of causing wake cracks.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG. 2 is a view showing the relationship between the speed of the movable electrode and the collision acceleration when the cushioning member of the above embodiment comes into contact with the protruding portion. The figure is a front sectional view showing a conventional example. 1 ... Sealing container, 2 ... Fixed electrode, 2a ... Fixed contact, 3 ... Movable electrode, 3a ... Movable contact, 4 ... Terminal member, 7 ... Cylindrical part, 8 ... Bellows, 12 ... … Stopper, 12c …… Projection, 13 …… Cushioning member.

Claims (1)

[Claims] 1. A sealed container in which an electrically insulative gas is sealed to form an airtight space, a fixed electrode having a fixed contact at a tip thereof, and a movable contact which comes into contact with and separates from the fixed contact in the sealed container. A movable electrode provided at one end, a terminal member fixed to the other end of the movable electrode, a stopper that restricts the return position of the movable electrode, a tubular portion through which the movable electrode is inserted, one end having the movable electrode and the other end having a tubular shape. A sealed contact device comprising: a bellows fixed to each of the portions; and a protrusion provided on the stopper, wherein the movable electrode partially abuts the protrusion before the return position is regulated. A sealed contact device, wherein a cushioning member that slows the return speed of the movable electrode as the degree of contact increases is disposed between the terminal member and the protrusion.