JPH0614410Y2 - electromagnetic switch - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic switch, and more particularly to an electromagnetic switch having an improved engagement structure between an armature and a yoke.

2. Description of the Related Art For example, an electromagnetic switch used for conducting / interrupting a large current, especially a DC circuit, has an insulating material with a high thermal conductivity inside for the purpose of preventing damage due to an arc when a contact is interrupted and prolonging its life. A sealed contact device in which a characteristic gas is enclosed to enhance arc extinction is used, and an electromagnet device is used to drive a movable electrode of the sealed contact device.

FIG. 4 is a sectional view showing the structure of the electromagnetic switch 1 according to the conventional technique. In the electromagnetic switch 1, a sealed contact device 3 and an electromagnet device 4 are fixed on an insulating base 2 realized by ceramics or the like, and a cover member 5 such as glass or plastic is externally fitted to these.

In the sealed contact device 3, a movable contact 6 and a fixed contact 7 are arranged in the sealed container 5 so as to come into contact with and separated from each other, and a movable shaft 8 to which the movable contact 6 is fixed is separated from the sealed container 5. A drive arm 12 extending from the electromagnet device 4 abuts on the top portion 9 of the movable shaft 8 extending outward and protruding, and presses the top portion 9 of the movable shaft 8 in a direction indicated by an arrow a (downward in FIG. 4). . This pressing force is given by the angular displacement of the armature 13 connected to the drive arm 12.

The electromagnet device 4 includes an iron core 1 around which an electromagnetic coil 14 is wound.
5, a magnetic circuit is formed by the yoke 16, and when the electromagnetic coil 14 is excited, the Amati 13 is angularly displaced in the direction of the arrow a and presses the top 9 of the movable shaft 8 via the drive arm 12. To drive. At this time, the bellows 17 is also pressed and bent.

Due to the displacement of the movable shaft 8, the movable contact 6 and the fixed contact 7 come into contact with each other, and the circuit becomes conductive. When the pressing force is removed, the movable shaft 8
Is displaced upward by the pressure of the insulating gas charged in the sealing container 5 under high pressure and the spring restoring force of the bellows 17, and the circuit is cut off. The arc generated at the time of interruption is cooled by the insulating gas that is high-pressure sealed in the sealing container 5, and the pair of permanent magnet pieces 1 provided on the outer periphery of the sealing container 5.
Due to the magnetic blowout action of 8a and 18b, quick arc extinction is achieved.

FIG. 5 is a perspective view showing an engaging structure of the armature 13 and the yoke 16 of the electromagnet device 4 used in the conventional technique. A pair of fitting projections 19a, 19 for locking the plate-shaped t2 Ammatia 13 is attached to an end portion 16a of the yoke 16 formed of an L-shaped magnetic material such as a soft iron piece having a plate thickness t1 and a width n.
b is provided, and a pair of notches 20a and 20b are provided in the end portion 13a of the amateur 13 corresponding to the pair of fitting protrusions 19a and 19b. The notches 20a, 20b of the amateur 13 are fitted into the fitting protrusions 19a, 19b, and then the upper ends of the fitting protrusions 19a, 19b are caulked so that the amateur 13 can be angularly displaced with the notches 20a, 20b as fulcrums. It is locked to the end 16a of the yoke 16,
In this way, the main part of the electromagnet device 4 including the iron core 15 and the electromagnetic coil 14 is formed.

Problems to be Solved by the Invention However, the electromagnet device 4 as described above is provided by the Amati 1
In order to maintain the engagement between 3 and the yoke 16, a pair of fitting protrusions 19a and 19b must be formed on the yoke 16 and a pair of notches 20a and 20b on the armature 13 must be formed by machining. It was very troublesome and contributed to the increase in production costs. Further, since the plate thicknesses t1 and t2 of the armature 13 and the yoke 16 are large, both the height h of the fitting protrusions 19a and 19b and the depth l of the notches 20a and 20b must be large. The cross-sectional area s decreases. In order to compensate for this, there is a problem when the electromagnet device 4 becomes large in size, and it has been a technical subject to eliminate such a problem.

An object of the present invention is to solve the above-mentioned problems and to provide an electromagnetic switch which can reduce the production cost with a simple structure and can downsize the device.

Means for Solving the Problems The present invention provides (a) a sealed contact device 33, which is a sealed container 35 in which a high-pressure gas is sealed, a fixed contact 37 provided in the sealed container 35, and a sealed contact. The fixed contact 37 has a movable contact 36 provided in the container 35 and capable of contacting / separating from the fixed contact 37, and one end to which the movable contact 36 is fixed.
A movable shaft 38 extending to the opposite side, a bellows 47 through which the movable shaft 38 is inserted, and both ends of which are respectively connected to the sealing container 35 and the movable shaft 38; A sealed contact device 33 having a pair of permanent magnet pieces 48a, 48b that act to magnetically blow off the arc generated between the contact 37 and the movable contact 36, and (b) one side of the sealed contact device 33. Of the electromagnet device 34 disposed on one side (for example, on the left side of FIG. 1), an iron core 45, an electromagnetic coil 44 wound around the iron core 45, and a yoke 46 connected to the iron core 45.
Has a support end 46a arranged side by side with the magnetic attraction end 45b of the iron core 45, and at least the support end 46a.
Is a yoke 46 formed in a plate shape perpendicular to the radial direction of the movable shaft 38 of the sealed contact device 33, and an armature 43 for pressing and driving the top portion 39 of the movable shaft 38. The yoke 46 is provided on the portion 43a.
A plurality of pairs of protrusions 49a, 49c; 49b, 49d are formed on both sides in the thickness direction of the support end portion 46a of each of the protrusions 49a, 49c; 49b, 49d. Having amatia 43
It is an electromagnetic switch characterized by including and.

The embodiment of the present invention is directed to each pair of protrusions 49a, 49c;
Of the protrusions 49b and 49d on the side closer to the iron core 45
It is characterized in that a and 49b are made larger than the other protrusions 49c and 49d.

According to the present invention, at least the support end portion 46a of the yoke 46 of the electromagnet device 34 is provided at the movable shaft 38 of the sealed contact device 33.
Is formed in a plate shape perpendicular to the radial direction (the left-right direction of FIGS. 1 and 3) (the direction perpendicular to the paper surface of FIGS. 1 and 3). , A structure in which a plurality of pairs of projections 49a, 49c; 49b, 49d formed on the base end portion 43a of the Amasia 43 are fitted, whereby the Amasia 43 is resistant to vibration and shock.
It is possible to prevent problems such as displacement and dropout of the.

Further, according to the present invention, the plate-like support end portion 46a of the yoke 46 is fitted between the plurality of pairs of protrusions 49a, 49c; 49b, 49d as described above. The magnetic path area in the vicinity of the protrusions 49a, 49c; 49b, 49d and the support end portion 46a can be increased, that is, the magnetic resistance can be reduced.
Therefore, miniaturization is possible. In particular, the movable axis 38 of the sealed contact device 33 used in the electromagnetic switch
The magnetic attraction force by the iron core 45 of the Amachia 43 required to drive the slab is not only the contact pressure between the fixed contact 37 and the movable contact 36 in the sealed contact device 33 but also the sealed container 35.
This is the sum of the reaction forces due to the high pressure gas enclosed therein, and therefore the efficiency of the electromagnet device 34 needs to be improved, and the present invention, as described above, includes the protrusions 49a, 49c; 49b, 49d and the support end portion 46a. This is convenient because the magnetic resistance in the vicinity of can be reduced.

Embodiment FIG. 1 is a sectional view showing the structure of an electromagnetic switch using an electromagnet device according to an embodiment of the present invention. The electromagnetic switch 31 is
A sealing contact device 33 and an electromagnet device 34 are fixed on an insulating base 32 made of ceramics or the like, and a cover member 35 made of glass or plastic covers these components.

A movable contact 36 is provided in the sealed container 35 of the sealed contact device 33.
And the fixed contact 37 are arranged to face each other so as to come into contact with and separate from each other,
The movable shaft 38, to which the movable contact 36 is fixed, has the sealing container 35.
From the electromagnet device 34 abuts on the top 39 of the movable arm 3.
The top portion 39 of No. 8 is pressed in the direction indicated by arrow b (downward in FIG. 1). This pressing force is given by the angular displacement of the armature 43 connected to the drive arm 42. The features of the present invention are:
The mating structure between the armature 43 and the yoke 46, which is a supporting piece, is improved and simplified, which will be described later.

The electromagnet device 34 includes an iron core 4 around which an electromagnetic coil 44 is wound.
When a magnetic circuit is formed by 5 and the yoke 46 and the electromagnetic lever 44 is excited, the amacia 43 is angularly displaced in the direction of arrow b, and the top 39 of the movable shaft 38 is moved through the drive arm 42. Press to drive. At this time, the bellows 47 is pressed and bends together. The movable contact 3 is moved by the displacement of the movable shaft 38.
6 and the fixed contact 37 come into contact with each other, and the circuit becomes conductive. When the pressing force is removed, the movable shaft 38 is displaced upward by the pressure of the insulating gas charged in the sealing container 35 under high pressure and the spring restoring force of the bellows 47, and the circuit is cut off.

The arc generated at the time of interruption is cooled by an insulating gas having a high thermal conductivity such as hydrogen (H ₂ ) that is high-pressure sealed in the sealing container 35, and a pair of permanent magnets provided on the outer periphery of the sealing container 35. Due to the magnetic blowout action of the magnet pieces 48a and 48b, a rapid arc extinction is achieved. In the sealed contact device 33, the fixed contact 37 and the movable contact 36 are provided in the sealed container 35, and the movable contact 36 can contact / separate from the fixed contact 37. The movable contact 36 is fixed to one end of the movable shaft 38, and the movable shaft 38 extends to the side opposite to the fixed contact 37 (upward in FIG. 1). The movable shaft 38 is inserted through the bellows 47, and both ends of the bellows 47 are connected to the sealing container 35 and the movable shaft 38.

FIG. 2 is a perspective view showing an engaging structure of the armature 43 and the yoke 46 of the electromagnet device 34 according to the embodiment of the present invention.
The armature 43 is arranged so as to face the iron core 45 around which the electromagnetic coil 44 is wound, and a plurality (four in this embodiment) are provided at the base end portion 43a that engages with the support end portion 46a of the yoke 46 of the armature 43. The protrusions 49a, 49b, 49c, 49d are formed so as to be convex toward the side facing the yoke 46 by, for example, pressing. The protrusions 49a to 49d are frustoconical and have an inclined surface 55 that tapers from the Amasia 43 toward the yoke 46. As described above, the engaging structure of the Amasia 43 and the yoke 46 according to the present invention is
The feature is that the armature 43 is mounted on the yoke 46 and is slidably supported, and unlike the conventional technique, the engagement by caulking is not required, and the structure is very simple. The end portion 46a of the yoke 46 is fitted into the space d1 between the protrusions 49 thus formed.

Referring again to FIG. 1, the base end portion 43a of the armature 43 is placed on the end portion 46a of the yoke 46 in this manner, and the support spring 50 having a small spring force presses the base end portion 43a. It is supported so as to be angularly displaceable, with the base end portion 43a being substantially the center.

The drive arm 42 is made of, for example, a low specific gravity and high strength insulating material such as polyether sulfone (PES), and the L-shaped end portion 42a is angularly displaceable by the Amasia 43 at the base end portion 43a. Supported. Drive arm 42
Is wide at the end 42a and gradually narrows to extend in the direction of the movable shaft 38, and the final end is movable shaft 38.
It is provided so that the top portion 39 can be pressed.

Due to the spring force of the leaf spring 52, one end of which is fixed to the base end portion 43a of the armature 43 and the other end of which is suspended in the recess 51 provided in the drive arm 42, when the armature 43 is in the release position, The tip portion 43b is in contact with the intermediate portion 42a of the drive arm 42. At this time, the spring force of the leaf spring 52 is minimum. In this state Amasia 43
And the drive arm 42 are directly linked to each other to operate.

On the other hand, when the armature 43 is in the suction position, the tip of the drive arm 42 presses the movable shaft 38 and the leaf spring 52 functions to secure contact, and the tip of the armature 43 is located at the intermediate portion of the drive arm 42. Apart from 42a, the armature 43 and the drive arm 42 are linked only via the leaf spring 52. In this state, the leaf spring 52 is in the most bent state. That is, the spring force is in the maximum state.

FIG. 3 is an enlarged cross-sectional view around the protrusions 49a and 49c.
In the above-described embodiment, the plurality of protrusions 49a, 49b, 49c, 49d arranged on the base end portion 43a of the Amasia 43 are arranged.
Among them, by making the protrusions 49a, 49b on the side close to the iron core 45 large and the other protrusions 49c, 49d small,
The difference between the force with which the protrusions 49a and 49b are attracted to the yoke 46 and the force with which the protrusions 49c and 49d are attracted to the yoke 46 is added to the force with which the Amasia 43 is attracted to the iron core 45. The pressing force acting is further increased.

In the electromagnet device 34, the yoke 46 is connected to the iron core 45, and the yoke 46 has a support end portion 46 a arranged side by side with the magnetic attraction end portion 45 b of the iron core 45. York 46
Of the movable contact shaft 38 of the sealed contact device 33 in the radial direction (left-right direction in FIGS. 1 and 3).
Is formed in a plate shape that is perpendicular to (in the plane of the paper of FIGS. 1 and 3). The Amatia 43 attaches the top 39 of the movable shaft 38 to
It is pressed and driven via the drive arm 42. A pair of protrusions 49a and 49c and another pair of protrusions 49b and 49d are formed at the base end portion 43a of the Amasia 43. Two sets of protrusions 49a, 49c; 49b, 4 forming these pairs
9d are formed on both sides of the support end portion 46a in the thickness direction (left-right direction in FIG. 1). Each of these protrusions 49
As is clear from FIG. 3, a, 49c; 49b, 49d have inclined surfaces 55 that are separated from the yoke 46 as they become the tips, that is, as they go downward in FIG.

Effect of the Invention As described above, according to the electromagnetic switch of the present invention, the base end portion 43a of the armature 43 of the electromagnet device 34 has a plurality of pairs of plate-like support ends 46a of the yoke 46 on both sides in the thickness direction. Since a pair of projections 49a, 49c; 49b, 49d are formed and the plate-like support end portion 46a of the yoke 46 is fitted between the projections 49a, 49c; 49b, 49d forming a pair, Amatia 4 against vibration and shock
It is possible to prevent the problem that the 3 is displaced or comes off.

Further in accordance with the present invention, these protrusions 49a, 49c;
The magnetic resistance area can be reduced by increasing the magnetic path area between 49b and 49d and the support end portion 46a of the yoke 46, and thus the efficiency of the electromagnet can be improved.
In particular, this is because the sealed contact device 3 of the electromagnetic switch of the present invention.
The electromagnetic attraction force, which is the driving force of the armature 43 that presses and drives the movable shaft 38 of No. 3, is sealed in the sealing container 35 and the contact pressure between the fixed contact 37 and the movable contact 36 of the sealed contact device 33, and is sealed in the bellows 47. Since it is necessary to add the reaction force acting on the movable shaft 38 to the reaction force, it is important to improve the efficiency of the electromagnet, and the present invention can be suitably implemented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of an electromagnetic switch 31 using an electromagnet device 34 according to an embodiment of the present invention, and FIG. 2 is a diagram showing an armature 43 and a yoke 46 of an electromagnet device 34 according to an embodiment of the present invention. FIG. 3 is a perspective view showing the engaging structure, and FIG. 3 shows protrusions 49a and 49c.
FIG. 4 is an enlarged cross-sectional view of the vicinity, FIG. 4 is a cross-sectional view showing the structure of an electromagnetic switch using an electromagnet device according to the related art, and FIG. 5 is an engaging structure between an armature and a yoke of the electromagnet device according to the related art. It is a perspective view. 31 ... Electromagnetic switch, 33 ... Sealing contact device, 34 ... Electromagnet device, 37 ... Movable shaft, 42 ... Drive arm, 43 ... Amachia, 46 ... Yoke, 44 ... Electromagnetic coil, 45 ... Iron core, 4
8 ... Leaf spring, 49a, 49b, 49c, 49d ... Protrusion,
50 ... Support spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromichi Inoue 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References: 59-145006 (JP, U) JP, U) JP 60-43645 (JP, B2)

Claims (2)

[Scope of utility model registration request] 1. (a) A sealed contact device 33, which comprises a sealed container 35 in which gas is sealed under high pressure, a fixed contact 37 provided in the sealed container 35, and a fixed contact 37 provided in the sealed container 35. The fixed contact 37 has a movable contact 36 that can contact / separate from the fixed contact 37, and one end to which the movable contact 36 is fixed.
A movable shaft 38 extending to the opposite side, a bellows 47 through which the movable shaft 38 is inserted, and both ends of which are respectively connected to the sealing container 35 and the movable shaft 38; A sealed contact device 33 having a pair of permanent magnet pieces 48a, 48b that act to magnetically blow off the arc generated between the contact 37 and the movable contact 36, and (b) one side of the sealed contact device 33. Of the electromagnet device 34 disposed on one side (for example, on the left side of FIG. 1), an iron core 45, an electromagnetic coil 44 wound around the iron core 45, and a yoke 46 connected to the iron core 45.
Has a support end 46a arranged side by side with the magnetic attraction end 45b of the iron core 45, and at least the support end 46a.
Is a yoke 46 formed in a plate shape perpendicular to the radial direction of the movable shaft 38 of the sealed contact device 33, and an armature 43 for pressing and driving the top portion 39 of the movable shaft 38. The yoke 46 is provided on the portion 43a.
A plurality of pairs of protrusions 49a, 49c; 49b, 49d are formed on both sides in the thickness direction of the support end portion 46a of each of the protrusions 49a, 49c; 49b, 49d. Having amatia 43
An electromagnetic switch characterized by including and. 2. Each pair of protrusions 49a, 49c; 49b,
Of the 49d, the protrusions 49a, 49b on the side closer to the iron core 45
2. The electromagnetic switch according to claim 1, wherein each of the protrusions has a larger size than the other protrusions 49c and 49d.