JPH0963837A - Electromagnet for closing circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method or structure for easily preventing the lateral shift of a nonmagnetic spacer being inserted between the lower surface of a plunger and a ferromagnetic plate for supporting the plunger on the lower surface thereof in an electromagnet. SOLUTION: In place of a conventional method for preventing lateral shift of a spacer by fastening the spacer to a supporting plate by means of screws, a new method is employed for preventing lateral shift of a spacer by fitting the spacer in any one component of electromagnet except the spacer 7. For example, a flat recess is made in the upper surface of a supporting plate 6a and the spacer 7 is fitted therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker closing electromagnet device used for opening and closing an electromagnetically operated circuit breaker or the like, and more particularly to a solenoid coil and an inside of the solenoid coil. A plunger that reciprocates in the direction to move in and out of the lower end face of the solenoid coil, a main yoke that forms an external magnetic path between the end faces of the solenoid coil, and a support plate made of a ferromagnetic material that supports the plunger on the lower end face of the plunger. And an auxiliary yoke composed of a magnetic path made of a ferromagnetic material that connects this support plate to the main yoke, and a spacing plate made of a non-magnetic material inserted between the lower end surface of the plunger and the support plate of the auxiliary yoke. The present invention relates to an electromagnet device for closing a circuit breaker, which includes

[0002]

2. Description of the Related Art FIGS. 6 and 7 show an example of the structure of a conventional electromagnet device of this type, and FIG. 8 shows an electromagnetic operation type circuit breaker using the electromagnet device of the structure shown in FIGS. A switching system diagram is shown. The electromagnet device 1 includes a solenoid coil 2, a plunger 3 that axially reciprocates inside the solenoid coil 2 to move in and out a lower end surface of the solenoid coil 2, and an external magnetic path between both end surfaces of the solenoid coil 2. An auxiliary yoke 6 including a main yoke 5, a support plate 6a made of a ferromagnetic material such as a steel plate for supporting the plunger 3 at its lower end surface, and a magnetic path 6b connecting the support plate 6a to the main yoke 5, and a plunger. The spacing plate 7 inserted between the lower end surface of the base plate 3 and the support plate 6a, and in this example, a cylindrical cover 9 for preventing dust from adhering to the plunger 3 exposed below the main yoke 5. It consists of and. A plunger rod 11 is attached to the upper surface side of the plunger 3, and the plunger rod 11 is connected to the operation rod 26 of the vacuum circuit breaker 21 via the link mechanism 31 shown in FIG. The operation of this electromagnet device 1 is as follows.

When a voltage is applied to the solenoid coil 2 and a current is caused to flow, when the current value at the beginning of energization is small, the magnetic flux passing through the plunger 3 is mainly the support plate 6a and the magnetic path as shown by Φ ₁ in FIG. The magnetic flux Φ ₁ causes the plunger 3 to be attracted to the support plate 6a by flowing through an auxiliary yoke composed of 6b and 6b (since there is a gap g between the plunger 3 and the lower end surface 5C of the main yoke 5). When the current of the solenoid coil 2 increases with the passage of time, the auxiliary yoke 6
Since the magnetic path cross-sectional area of is small, magnetic saturation is reached immediately and the attractive force between the plunger 3 and the support plate 6a is suppressed to a substantially constant value, while the magnetic flux flowing from the plunger 3 to the lower end plate 5C of the main yoke 5 is reduced. Φ ₂ increases as the current value increases, and the driving force that pulls the plunger 3 upward increases as the current value increases. When the upward driving force of the plunger 3 exceeds the attraction force between the plunger 3 and the support plate 6a, the plunger 3 separates from the support plate 3a and moves upward, that is, in the direction of the arrow P. When the plunger 3 moves in the P arrow direction, the driving force is transmitted to the operating rod 26 of the vacuum circuit breaker 21 via the plunger rod 11 attached to the upper surface of the plunger 3 and the link mechanism 31.
The operating rod 26 moves in the Q direction. Operating rod 2
When 6 moves in the Q direction, the main movable contact 22 moves the contact spring 2
It is pushed downward via 5, contacts the main fixed contact 23, and the vacuum circuit breaker 21 is turned on. The plunger 3 is the support plate 6a.
The current of the solenoid coil 2 when it moves upwards away from the axis differs depending on the cross-sectional area of the narrowest magnetic path of the auxiliary yoke 6,
Increasing the narrowest path cross-sectional area, the magnetic path becomes long time to reach the saturation point, the current of the solenoid coil 2 when start moving is increased, the driving force is increased after the started moving, the vacuum interrupter 21 The throwing force transmitted to the operating rod 26 of No. 2 becomes large, and it is possible to overcome the strong contact spring 25 and bring the movable main contact 22 to the final closed position. However, if the throwing force is too strong, the impact force remaining at the final closed position becomes too large. Therefore, with the auxiliary yoke 6 alone, the setting of the narrowest magnetic path cross-sectional area causes
A method of adjusting the current value when the compression spring 12 starts to move is used by reducing the current value when the movement starts. A spacing plate 7 made of a non-magnetic material is inserted between the lower surface of the plunger 3 and the support plate 6a. However, if the spacing plate 7 is not provided, the spacing plate 7 will be separated from the lower surface of the plunger 3 and the upper surface of the support plate 6a. The suction force between the two changes depending on how well it hits.
When the plunger 3 starts moving, the current of the solenoid coil 2 changes, the driving force after moving changes, and the throwing force transmitted to the operating rod 26 varies. This is to prevent the abnormal arcing from occurring suddenly when it comes into contact with the fixed main contact 23, resulting in abnormal wear of the main contact.

[0004]

In the conventional electromagnet device, when a non-magnetic spacing plate for stabilizing the solenoid coil current when the plunger starts to move is inserted between the lower surface of the plunger and the support plate, As shown in FIG. 7, the spacing plate 7 was fixed to the upper surface of the support plate 6a with a screw 8 to prevent lateral displacement of the spacing plate. However, in this lateral deviation prevention method, the area of the spacing plate becomes unnecessarily large in order to prevent the screw 8 from colliding with the lower surface of the plunger 3, and the screw tightening causes a problem that the work takes time. was there.

It is an object of the present invention to provide a lateral deviation preventing method or structure capable of easily preventing lateral deviation in the electromagnet device having the structure described at the beginning without increasing the area of the spacing plate.

[0006]

In order to solve the above problems, according to the present invention, as described in claim 1, a spacer plate inserted between the lower end surface of the plunger and the support plate of the auxiliary yoke is provided. The lateral deviation is prevented by fitting the spacing plate into any of the electromagnet constituent members excluding the spacing plate.

Specifically, as described in claim 2, the constituent member of the electromagnet device into which the spacing plate is fitted and its portion are set as the upper surface of the supporting plate of the auxiliary yoke, and the upper surface of the auxiliary yoke supporting plate is set to the upper surface of the auxiliary yoke supporting plate. As described in 1, form a flat concave surface having a peripheral shape capable of fitting the spacing plate with almost no gap, or
Alternatively, as described in claim 4, a flat concave surface having a peripheral shape that creates a gap with the peripheral edge of the spacing plate is formed, and a circular boss for positioning the spacing plate is erected on this concave surface.

Alternatively, when a cylindrical cover for preventing dust from adhering to the plunger surface exposed below the main yoke is attached as described in claim 5,
The component member of the electromagnet device into which the gap plate is fitted and its portion may be the lower end surface of the cover.

[0009]

As described above, if the spacing plate is prevented from being laterally displaced by fitting the spacing plate into any of the electromagnet device constituent members excluding the spacing plate, the space required for the conventional screw tightening is reduced. The area of the partition plate can be reduced. Further, the assembly time of the electromagnet device is shortened by the time required for the screw tightening work, and the assembly cost is reduced.

If the constituent members of the electromagnet device into which the spacing plate is fitted and the parts thereof are the upper surface of the auxiliary yoke support plate, a concave surface for fitting is formed on the upper surface of the support plate, so that the upper surface of the conventional support surface is It eliminates the need for detailed work such as hole alignment for screw tightening, which was necessary to prevent lateral slippage of the
Side slip prevention is easily possible. When the spacing plate is fitted on the upper surface of the support surface, a flat concave surface having a peripheral shape that allows the spacing plate to be fitted on the upper surface of the support surface with almost no gap is formed to fit the spacing plate. Since it is necessary to match the shape with the peripheral shape of the concave surface, a press punching die or the like may be used for manufacturing the spacer depending on the peripheral shape of the concave surface, so that the spacer alone may be slightly expensive. Therefore, the lateral deviation can be prevented extremely easily.

Further, on the upper surface of the auxiliary yoke support plate, a flat concave surface having a peripheral shape which forms a gap with the peripheral edge of the spacing plate is formed, and a circular boss for positioning the spacing plate is erected on this concave surface. If the spacing plate is fitted to the circular boss to prevent lateral displacement, the spacing plate can be obtained at a low cost because the peripheral shape of the spacing plate is less restricted. Further, a plurality of small and simple spacing plates can be used to provide the same function as one conventional spacing plate.

When a cylindrical cover is attached to the main yoke to prevent dust from adhering to the surface of the plunger exposed below the main yoke, the constituent members of the electromagnet device in which the gap plate is fitted and its portion are attached. If the lower end surface of the cover is used, the dust-proof cover is made into a cylindrical shape, so a step hole for fitting the spacing plate may be formed on the lower end surface side of this cylinder. The cheapest and simplest possible lateral slip prevention is possible.

[0013]

1 and 2 show a first embodiment of the present invention. In this embodiment, an example of the shape of the concave surface formed on the upper surface of the support plate 6a when the spacing plate 7 is fitted on the upper surface of the support plate 6a of the auxiliary yoke is shown. The concave surface has a rectangular peripheral shape, and as the spacing plate 7, a rectangular or strip-shaped non-magnetic plate having a width equal to the short side b (long side a) of the square is used as the long side a of the square.
Cut into the same length as (short side b) and fit. Although various methods can be used to form the rectangular concave surface, in order to prevent lateral displacement, it is sufficient that the intervals between the two opposite sides of the rectangular shape satisfy desired values, and the shapes of the four corners are not particularly limited. For example, by using an end mill machine as a machine tool and forming a concave surface in a shape as shown in FIG. 2C instead of the rectangular shape as shown in FIG. Can be crowded.

FIG. 3 shows a modification of the first embodiment. In this modification, when the spacer is fitted on the upper surface of the auxiliary yoke support plate, a gap is provided between the peripheral edge of the spacer and the peripheral edge of the concave surface to facilitate the formation of the peripheral shape of the spacer. An example of is shown. A circular boss 13 is erected on the bottom surface of the concave surface by a method such as spot welding, and the circular boss 13 is attached to the circular boss 13.
It has a square spacing plate that is smaller than a square concave surface and has holes of the same diameter as the above. Since the size of the gap between the spacing plate and the peripheral edge of the concave surface does not need to be strict, there is an advantage that the spacing plate can be obtained at low cost.

FIG. 4 and FIG. 5 show a second embodiment of the present invention. This embodiment is a component of an electromagnet device in which a spacing plate is fitted when a cylindrical cover made of a non-magnetic material is attached to prevent dust from adhering to the plunger surface exposed below the main yoke. An example of the fitting structure in the case where that portion is the lower end surface of the cover is shown. The cover 9 has its upper end face side fitted into the anchor on the lower face of the lower end plate 5C of the main yoke 5, and its lower end face comes into contact with the upper face of the support plate 6a by its own weight to fulfill the role of dust proof. As shown in FIG. 5, the lower end surface of the cover 9 can be fitted into the lower end surface of the cover 9 by cutting the lower end surface slightly deeper than the thickness of the outer cover 7. Although the thickness of the spacing plate 7 is exaggerated in FIG. 5, it is actually a thin non-magnetic disc made of stainless steel or the like, which is formed by press punching.

[0016]

According to the present invention, the non-magnetic spacing plate inserted between the lower surface of the plunger of the electromagnet device and the upper surface of the ferromagnetic support plate of the auxiliary yoke is prevented from lateral displacement by the above method or structure. The effect described in (1) is obtained. In the lateral deviation prevention method according to claim 1, the lateral deviation prevention method is one in which the spacing plate is fitted into any of the electromagnet device constituent members excluding the interval plate, so that the lateral deviation is prevented by tightening the screws to the support plate. Compared with the above method, the area of the spacing plate can be made smaller, and since the fitting takes almost no time, the assembly time of the electromagnet device can be shortened, and the cost of the electromagnet device can be reduced in terms of material and assembly man-hours.

In the lateral deviation prevention structure according to the second aspect of the present invention, since the concave surface for fitting is formed on the upper surface of the support plate, there is no need for fine work such as hole alignment for screwing on the upper surface of the support plate, and lateral deviation prevention Is now possible. Claim 3
In the lateral deviation prevention structure described, lateral deviation is prevented by fitting the spacing plate into the concave surface of the upper surface of the support plate without any gap.
Although the spacing plate alone may be expensive in view of the circumferential shape of the spacing plate and the dimensional accuracy of the circumferential shape, a separate member is not required to prevent lateral displacement, so the number of components required for the configuration of the electromagnet device is reduced. The cost can be minimized and the cost can be reduced in terms of inventory management.

In the lateral deviation prevention structure according to the fourth aspect of the present invention, lateral deviation prevention of the spacing plate fitted in the concave surface of the upper surface of the support plate is performed by the circular boss standing on the concave surface, and the circumferential edge of the spacing plate and the concave surface peripheral edge are formed. Since a gap is allowed to exist between the gap plates, there are few restrictions on the peripheral shape of the gap plate and the dimensional accuracy of the peripheral shape, and the gap plate can be inexpensively obtained. In the lateral deviation prevention structure according to claim 5, since the spacer plate is processed into the dustproof tubular cover and fitted into the lower end surface side, the recess for fitting can be easily formed, and the fitting structure is inexpensive. Obtainable.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnet device showing a first embodiment of a spacing plate lateral deviation prevention structure according to the present invention.

2A and 2B show an example of a concave shape of the upper surface of a support plate for fitting the spacing plate in the spacing plate lateral deviation prevention structure shown in FIG. 1, in which FIG. 2A is a top view, FIG. FIG. 6C is a diagram showing a more practical shape example of a concave surface having the same lateral deviation prevention effect as the concave shape shown in FIG.

3 is a diagram showing an example of a concave shape of the upper surface of the support plate for fitting the spacing plate in the spacing plate lateral deviation prevention structure shown in FIG. 1 and a lateral deviation prevention method for the fitted spacing plate;
(A) is a top view, (b) is a BB cross-section arrow view in (a).

FIG. 4 is a sectional view of an electromagnet device showing a second embodiment of the spacing plate lateral deviation prevention structure according to the present invention.

5 is an enlarged view of a main part in the cross-sectional view of FIG.

FIG. 6 is a cross-sectional view of an electromagnet device showing a conventional example of a spacing plate lateral displacement prevention structure.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a switching system diagram of a vacuum circuit breaker using the electromagnet device shown in FIGS. 6 and 7.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnet device 2 Solenoid coil 3 Plunger 5 Main yoke 6 Auxiliary yoke 6a Support plate 6b Magnetic path 7 Spacing plate 8 Screw 9 Cover 11 Plunger rod 12 Compression spring 13 Circular boss

Claims (5)

[Claims] 1. A solenoid coil, a plunger for reciprocating inside the solenoid coil in the axial direction of the solenoid coil to move in and out of a lower end face of the solenoid coil, and an external magnetic path between both end faces of the solenoid coil. An auxiliary yoke composed of a yoke, a support plate made of a ferromagnetic material for supporting the plunger on the lower end surface of the plunger, and a magnetic path made of a ferromagnetic material connecting the support plate to the main yoke; and a lower end surface of the plunger. In an electromagnet device for closing a circuit breaker configured by using a spacer plate made of a non-magnetic material, which is inserted between the supporting plate of the auxiliary yoke and the supporting plate of the auxiliary yoke. For preventing lateral displacement of the spacing plate by inserting the spacing plate into any of the electromagnet constituent members excluding the spacing plate. Electromagnet device. 2. The electromagnet device for closing a circuit breaker according to claim 1, wherein the constituent members of the electromagnet device into which the spacing plate is fitted and the parts thereof are the upper surface of the support plate of the auxiliary yoke. 3. The auxiliary yoke support plate according to claim 2, wherein the upper surface of the auxiliary yoke support plate into which the spacing plate is fitted is for fitting.
An electromagnet device for closing a circuit breaker, characterized in that a flat concave surface having a peripheral shape that allows a space plate to be fitted therein with substantially no space is formed. 4. The one according to claim 2, wherein the upper surface of the auxiliary yoke support plate into which the spacing plate is fitted is for fitting.
A flat concave surface having a peripheral shape that creates a gap with the peripheral edge of the spacing plate is formed, and a circular boss for positioning the spacing plate is erected on the concave surface. Electromagnetic device. 5. The gap plate is fitted in the main yoke according to claim 1, when a cylindrical cover for preventing dust from adhering to the plunger surface exposed below the main yoke is attached to the main yoke. An electromagnet device for closing a circuit breaker, characterized in that a component of the electromagnet device and its portion are used as a lower end surface of a cover.