JPH0749712Y2 - Sealed contact device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sealed contact device that is preferably implemented in a power switch such as an electromagnetic switch.

2. Description of the Related Art Sealed contact devices prevent the metal of contact points and contact support members from evaporating and scattering to contaminate the inside due to the arc heat generated when a large current, especially a direct current, is interrupted, and reduce the insulation and life. In order to protect the gas, an electrically insulating gas with a high thermal conductivity such as hydrogen (H ₂ ) is sealed in a sealed container at high atmospheric pressure, and a permanent magnet piece is placed facing the outer wall across the container. With the cooling capacity and the blowout action by the movement of the arc based on the Lorentz force in the magnetic field due to the permanent magnet pieces, the generated arc is quickly extinguished, and the reliability of the contact device is improved and the service life is extended. ing.

The opening / closing operation of such a sealed contact device is a generally used method in which an electromagnet is used to cause the movable electrode to respond to the suction or release operation of the armature.

FIG. 6 is a cross-sectional view showing a structure of a sealed contact device 1 according to the prior art with a part of the structure omitted. The sealed contact device 1 includes a sealed contact portion 3, an electromagnet portion 4, and a drive portion 5 in an insulating case 2.
And are arranged. The sealed contact portion 3 includes a sealed container 3a,
A movable electrode 3c protruding outward from a guide member 3b arranged on the upper side thereof is provided, and a pair of arc blowout permanent magnet pieces 3d, 3e are arranged to face each other in contact with the outer wall of the sealing container 3a. Surrounded by 3f. An insulating cap 3g is fitted on the head of the movable electrode 3c and is in contact with the lower surface of the tip portion 5c of the drive member 5a, which will be described later.

The electromagnet portion 4 is composed of a substantially L-shaped yoke 4a, an iron core 4b, a coil 4c wound around the iron core 4b, and an armature 4e whose end is supported by a long piece 4d of the yoke 4a. Also, the long piece
One end of a substantially V-shaped hinge spring 4f is fixed to 4d, and the other end is in pressure contact with the end of the armature 4e.

The drive unit 5 is formed of a drive member 5a and a leaf spring material 5b interposed between the drive member 5a and the armature 4e. The tip portion 5d of the leaf spring member 5b contacts the step portion 5e formed on the drive member 5a, and the spring load of the leaf spring member 5b is applied to the step portion 5e. When the armature 4e is in the suction position, the armature 4e and the drive member
5a is linked only via the leaf spring material 5b, the spring force of the leaf spring material 5b is maximized, and when the armature 4e is in the released state, the armature 4e and the driving member 5a are directly linked to each other, and Spring material
The spring force of 5b is minimal.

FIG. 7 is a sectional view showing the peripheral structure of the armature 4e and the driving member 5a in order to show the operation of the sealed contact device 1 according to the conventional technique. In FIG. 7, parts corresponding to those in FIG. 6 are designated by the same reference numerals.

When the contact is opened, that is, when the armature 4e is released, the maximum spring force of the leaf spring material 5b is applied to the armature 4e, and only the armature 4e first collides with the driving member 5a while maintaining the contact state of the contact. 7 gradually moves upward and contacts the driving member 5a, and then the driving member 5a receiving the kinetic energy of the armature 4e moves to the release position together with the armature 4e. The pressing force on the insulating cap 3g, which is a portion, is removed, and the displacement speed of the movable electrode 3c to the upper side in FIG. 7, that is, the contact opening speed is relatively high, and the contacts are quickly interrupted.

However, in the above-described operation, when the armature 4e is released, the pushing force of the armature 4 is applied to the position where the spring load of the leaf spring material 5d acts, that is, the position closer to the movable electrode 3c than the step 5e. It is necessary to add, and if the drive member 5a is deformed such as warped,
As shown in FIG. 7, a gear gap Δd is generated between the driving member 5a and the armature 4e, and the push-up force of the armature 4e acts on the point a opposite to the movable electrode 3c with the spring load point c interposed therebetween. If you do, the situation changes completely.

FIG. 8 is a diagram schematically showing the operation in this case. Referring also to FIG. 7, a pushing force Fa from the armature 4e indicated by an upward arrow acts on the point a of the driving member 5a.
Point c is the spring load point, and the spring load Fc of the leaf spring material 5d is applied in the direction indicated by the downward arrow. Point b is a driving member
At the contact point between the tip 5b of 5a and the insulating cap 3g, the movable electrode
The restoring force Fc of 3c acts as shown by the upward arrow.
A point d is a fulcrum position of the unillustrated armature 4e, which is a fulcrum point between the armature 4e and the yoke 4a.

As shown in FIG. 8, the armature is located on the side opposite to the point b on which the restoring force of the movable electrode 3c is applied, that is, on the side of the fulcrum position d of the armature 4e across the point c to which the spring load Fc of the leaf spring material 5d is applied. 4e
When the contact point a of the drive member 5a exists, the moment represented by Fa · l−Fb · m (1) acts on the drive member 5a by the release operation of the armature 4e with the point c as the fulcrum. In the first equation, l,
m shows the distance between the points c-a and the point c-b, respectively.

Due to the action of the moment, the driving member 5a generates a rotational force Fd about the point c as a fulcrum. The direction of this force Fd is opposite to that of the force Fb acting on the tip 5b of the drive member 5a.
It works to push 3c downward in Fig. 7. Therefore, the restoring force Fb of the movable electrode 3c is attenuated, the contact opening speed decreases, and the performance of the sealed contact device is impaired. Therefore, this is a problem to be solved in the conventional technique.

An object of the present invention is to solve the above technical problems and to provide a sealed contact device in which a contact position between an armature and a driving member caused by deformation of the driving member is held constant, and stable and high-speed operation is ensured. Is to provide.

Means for Solving the Problems The present invention is directed to a sealed container in which a fixed contact and a movable contact are enclosed and a head of a movable electrode integral with the movable contact is projected above, an electromagnet having an armature, and a movable container. The end part is angularly displaceable around the base part, and the free end part pushes / releases the head part of the movable electrode in the axial direction. In a sealed contact device including a spring member that elastically urges in a proximity direction, a protrusion is formed at a position in contact with the other of at least one of the armature and the drive member, and the protrusion. In the sealed contact device, the formation position of is set to the movable electrode side with respect to the spring load point acting on the driving member.

The sealed contact device according to the present invention has a protrusion formed at a position where it comes into contact with the other of at least one of the armature and the drive member, and the position of the movable electrode is higher than the spring load point acting on the drive member. By setting to the push-up point side,
When the armature is released, that is, when the movable electrode is opened, the force that acts in the direction of obstructing it is eliminated, and a stable operation is realized.

Embodiment 1 FIG. 1 is a sectional view showing the structure of a sealed contact device 1 according to an embodiment of the present invention. The sealed contact device 11 includes a sealed contact portion 13, an electromagnet portion 14, and a drive portion 15 arranged in an insulating case 12. The sealed contact portion 13 has a fixed contact (not shown) and a movable contact (not shown) arranged therein to face each other, and a sealed container 13a in which an electrically insulating gas such as hydrogen gas is sealed under high pressure, and an upper portion of the sealed container 13a. The guide member 13b provided and the sealed container 13a
A pair of arc-extinguishing permanent magnet pieces 13c, 13d arranged in contact with the outer periphery of the sealing container 13a and the permanent magnet pieces 13c, 13d.
It is formed from each part such as a yoke 13e surrounding d.
A movable electrode 13f connected to a movable contact (not shown) penetrates through the bellows 13g provided on the guide member 13b and the guide member 3b to protrude to the upper end of the guide member 13b, and the insulating cap 13h fitted to the head thereof. Is the tip of the drive member 15a described later.
It is in contact with the lower surface of 15b.

The electromagnet section 14 is a substantially L-shaped yoke 14a made of a magnetic material such as soft iron, and an iron core whose base end is fixed to its short piece 14b.
14c, an exciting coil 14d wound around an iron core 14c, and an armature 14e made of a magnetic material such as soft iron. The base end 14f of the armature 14e is the long piece 1 of the yoke 14a.
It is rotatably supported by 4g, and the tip portion 14h is rotatably supported with the fulcrum position as a fulcrum. In order to ensure the support of the base end portion 14f of the armature 14e, a hinge spring 14 having a generally V shape is used.
One end of i is fixed to the long piece 14e of the yoke 14a, and the other end thereof is pressed against the base end 14f.

The drive unit 15 is formed of a drive member 15a made of an electrical insulating material having a low specific gravity and high strength such as polycarbonate, and a leaf spring material 15b interposed between the drive member 15a and the armature 14e. The tip end portion of the leaf spring material 15b abuts on a step portion 15c formed on the drive member 15a, and the base end portion 15h thereof is fixed to the base end portion 14f of the armature 14e. As a result, the spring load of the leaf spring member 15b is applied to the contact point of the step portion 15c.

FIG. 2 shows the drive member 15a used in this embodiment
FIG. 14 is a perspective view seen from the side of the armature 14e shown in the figure. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals. The drive member 15a has a generally V-shape with a narrow width in the longitudinal direction, that is, from the base end portion 15d to the tip end portion 15e, and the lower surface 15g of the tip end portion 15e is in contact with the insulating cap 13h shown in FIG.
A protrusion 15f, which is a feature of the present invention, is formed at a position where it comes into contact with the tip portion 14h of the armature 14e shown in FIG.

3 (1) to 3 (4) are diagrams showing the operation of this embodiment. In FIG. 3, parts corresponding to those in FIGS. 1 and 2 above are designated by the same reference numerals.

In Fig. 3 (1), the armature 14e is in the suction position, the tip 14h of the armature 14e is attracted to the iron core 14c, and the driving member 15a is moved by the spring force of the leaf spring material 15b through the insulating cap 13h. 13c is pressed in the direction of arrow A, and the contact not shown is in a conductive state. The armature 14e and the driving member 15a are linked only via the leaf spring material 15b, and a minute gap Δg is formed between the projection 15f formed on the driving member 15a and the tip portion 14h.

In Fig. 3 (2), the excitation to the coil 14d is cut off and the
The state immediately after releasing 4e is shown. The suction force of the iron core 14c is lost, and the spring force of the leaf spring material 15b becomes maximum, so that the armature 14e
The front end portion 14h is pivotally displaced in the direction indicated by the arrow B about the base end portion 14f as an axis. In this state, the contact state of the contact is still maintained, and the tip portion 14h of the armature 14e is driven by the driving member 15
It rapidly approaches the projection 15f provided on a.

FIG. 3 (3) shows the tip portion 14h of the armature 14e and the driving member 15
It shows a state in which the protrusion 15f provided on a is in contact, and the armature 14e and the driving member 15a are directly linked. The kinetic energy of the idle running armature 14e is transmitted to the driving member 15a, and the driving member 15a pivots extremely quickly together with the armature 14e to the direction indicated by the arrow C with the base end 14f as a fulcrum, that is, the releasing position. Displace. Here, the contact point p2 between the tip portion 14h of the armature 14e and the protrusion 15f in this embodiment is located on the movable electrode 13c side of the spring load point of the leaf spring material 15b, that is, the point p1 on the step portion 15c. It should be noted that the provision of the protrusion 15f ensures that the drive member 15a and the armature 14e abut at the position p2 even if the drive member 15a and the armature 14e are deformed due to warping or distortion. The contact point p between the insulating cap 13h provided on the head of the movable electrode 13c and the tip 15e of the driving member 15a is
The restoring force of the movable electrode 13c acts on 3.

FIG. 3 (4) shows that the armature 14e and the drive member 15a are linked to each other and swung to the release position. The contacts are opened and the circuit is broken.

FIG. 4 is a diagram schematically showing the operation of this embodiment. FIG. 4 shows the same state as that shown in FIG. 3 (3), and corresponding parts are designated by the same reference numerals.

Referring also to FIG. 3 (3), an upward force F1 is applied to the contact point p2 between the tip 14h of the armature 14e and the projection 15f, and the tip 15e of the drive member 15a and the insulating cap 13h are contacted. Contact p2
The restoring force F2 of the movable electrode 13c acts on each of them in the direction shown in the figure. On the other hand, the point p1 is the point of application of the spring load F3 of the leaf spring material 15b on the step portion 15c of the drive member 15a. Force F1, F2 and force F3
The direction is opposite to that of, and as a result, a moment represented by F1 · a1 + F2 · a2 (2) acts on the driving member 15a with the point p1 as the fulcrum. In the second equation, a
1, a2 indicate the distances between points p1 and p2 and between points p1 and p2, respectively. Due to the action of the moment, the driving member 15a moves to the point p
A rotational force with the fulcrum of 1 acts, and the drive member 15a is extremely quickly displaced to the release position shown in FIG. 3 (4).

Comparing FIG. 4 according to the present embodiment with FIG. 8 according to the above-mentioned conventional technique, it is clear that the point of action of force at the time of release is completely different. At the time of operation, the force that reduces the restoring force of the movable electrode, which has been found in the prior art, does not occur at all, so it is possible to perform extremely high-speed contact breaking operation, and the sealed contact with significantly improved reliability. The device can be realized.

Although the projection 15f is provided on the drive member 15a in order to improve the point of action of force in the above-described embodiment, as shown in FIG. 5, the tip portion 14h of the armature 14e facing the drive member 15a is opposed.
You may make it form the protrusion 14j. As a result, a conventional drive member 15a can be used, and its molding is simplified.

As described above, in the sealed contact device according to the present invention, the protrusion is formed at the position where it abuts on the other side of at least one of the armature and the drive member, and the spring load acting on the drive member at that position. It was set so as to be closer to the movable electrode than the point.
Therefore, even if an unfavorable deformation such as warpage occurs in the driving member during use, there is no force to reduce the restoring force of the movable electrode during the release operation of the armature, so an extremely high-speed contact breaking operation can be performed. It is possible to realize a sealed contact device which is remarkably improved in reliability, and its effect is extremely large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a sealed contact device 11 according to an embodiment of the present invention, FIG. 2 is a perspective view showing the shape of a driving member 15a thereof, and FIGS. Diagram showing the operation of the embodiment,
FIG. 4 is a diagram schematically showing the operation of this embodiment, and FIG. 5 is a perspective view showing the shape of an armature 14e of another embodiment of the present invention,
FIG. 6 is a cross-sectional view showing the structure of a conventional sealed contact device 1, FIG. 7 is a view showing the structure around the armature 4e and drive member 5a, and FIG. 8 is a conventional sealed contact. It is a figure which shows operation | movement of the apparatus 1 typically. 11 ... Sealed contact device, 13 ... Sealed contact part, 13a ... Sealing container, 13c ... Movable electrode, 13h ... Insulation cap, 14 ...
Electromagnet part, 14c ... iron core, 14e ... armature, 14h ... armature tip, 14j ... protrusion provided on the armature tip, 15a ... drive member, 15b ... leaf spring material, 15f ... drive Projection provided on the member

Claims (1)

[Scope of utility model registration request] 1. A sealed container in which a fixed contact and a movable contact are enclosed and a head of a movable electrode integral with the movable contact is projected at an upper portion, an electromagnet having an armature, and a free end portion being a base end portion. Is freely angularly displaceable around the movable electrode, and the free end pushes / releases the head of the movable electrode in the axial direction, and the armature and the movable electrode driver are elastically moved toward each other. In a sealed contact device including a spring member for urging the spring member, a protrusion is formed at a position in contact with the other of at least one of the armature and the drive member, and the formation position of the protrusion is the drive position. A sealed contact device characterized in that it is set on the movable electrode side with respect to a spring load point acting on a member.