JPH05326257A - Device for manual operation of solenoid - Google Patents

Abstract

PURPOSE:To make it possible to release a moving iron core from attraction without energizing an electromagnetic coil. CONSTITUTION:A moving iron core 17 is housed in an electromagnetic coil 13 in a way that it is movable. The moving iron core 17 is provided with a permanent magnet 18 so that it will be attracted and held by a stationary iron core 14 in the case of deenergization. A demagnetization ring 21 reducing the attraction force of the permanent magnet 18 is idly fit in the gap (f) between the moving iron core 17 and the electromagnetic coil 13. To release the moving iron core 17 from attraction, the demagnetization ring 21 is so positioned that the permanent magnet 18 is shielded and its magnetic flux PHIm is short-circuited. The short circuit of the magnetic flux PHIm reduces the attraction force of the permanent magnet 18, making it possible to quickly and easily release the moving iron core 17 from the stationary iron core 14 by hand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a movable iron core is urged in a suction direction, maintains the suction state even if the urging is released, and when the movable iron core is returned to its original position, it is urged in the opposite direction. The present invention relates to a manual operation device for a self-holding solenoid, which is configured so that a self-holding solenoid can be returned by closing.

[0002]

2. Description of the Related Art Generally, a self-holding solenoid (hereinafter,
A solenoid is used to attract the movable iron core when the current supplied to the solenoid coil of the solenoid is in the positive direction, and once the movable iron core is attracted, the movable iron core is attracted even if the energization is stopped. When the movable core is held at the position and the attraction of the movable core is released, a reverse current is applied to the electromagnetic coil to restore the movable core from the attracted position to the original position. After being sucked once, the electromagnetic coil is held at the suction position without being energized to reduce the power consumed by the solenoid.

The solenoid disclosed in, for example, Japanese Utility Model Publication No. 61-38166 is generally well known, and its schematic structure will be described with reference to FIG. In FIG. 6, reference numeral 1 denotes a bottomed cylindrical magnetic yoke, and a fixed iron core 3 having a permanent magnet 2 fixed to the top is attached to the center of the bottom of the inner side surface thereof. A guide cylinder 4 is fitted toward the opening end side of the magnetic yoke 1, and a movable iron core 5 is inserted into the guide cylinder 4 so as to be slidably movable along the axis of the magnetic yoke 1. An electromagnetic coil 6 wound around a coil bobbin (not shown) is fitted and inserted outside the guide cylinder 4 in a space between the magnetic yoke 1 and the auxiliary yoke 7. Closed at. Further, the movable iron core 5 is displaced between the movable iron core 5 and the fixed iron core 3 by a biasing force of a return spring (not shown) so as to keep a predetermined space in a direction away from the fixed iron core 3, and is received by a stopper (not shown) to adjust the stroke. The solenoid 8 is configured in the manner described above.

The operation of the solenoid 8 is as follows. When a forward current is applied to the electromagnetic coil 6, the magnetic yoke 1 → the fixed iron core 3
→ Movable iron core 5 → Guide cylinder 4 → Auxiliary yoke 7 forms a closed magnetic path, and the magnetic flux flowing in the closed magnetic path causes the movable iron core 5 to move to the fixed iron core 3 side and the permanent magnet 2 of the fixed iron core 3.
Suctioned and held on top. If the power supply is cut off while the movable iron core 5 is attracted, the movable iron core 5 is held at the attracting position by the magnetic attraction force of the permanent magnet 2 without requiring a holding current. Next, when the movable iron core 5 is separated from the fixed iron core 3 (suction is released), a reverse current is applied to the electromagnetic coil 6, and a magnetic flux flows in the closed magnetic circuit in a direction to return the movable iron core 5 to its original position, thereby causing a permanent magnet. Cancel the magnetic flux of 2. As a result, the attraction force of the permanent magnets 2 on the movable iron core 5 is reduced, the attraction of the movable iron core 5 with the fixed iron core 3 is released, and the movable iron core 5 is rapidly returned to the original position by the force of the return spring.

[0005]

The solenoid having the above-mentioned structure is used, for example, as a brake releasing device for an electric shutter or as a driving means for a closing / closing device in a circuit breaker. However, the solenoid does not have any means for manually operating the movable iron core from the outside in the event of a power failure or failure of equipment using the solenoid, so for example, in an emergency, the brake of the electric shutter is manually released to release the shutter. In some cases, it could not be closed.

In order to solve the above-mentioned problems, for example, an emergency power source (such as a storage battery) is specially installed in a device such as an electric shutter, in case of a power failure accident or inspection of the device.
It is conceivable to supply the emergency power supply to a solenoid to drive it. However, installing the emergency power supply in each device not only poses an economic problem, but also the installation space is damaged due to the increase in the size of the equipment used, and maintenance / maintenance is not possible.
There were various problems such as time-consuming management.

In view of the above problems, the present invention is provided with means for operating the movable iron core of the solenoid manually and quickly from the outside. An object is to provide a manual operation device for a self-holding solenoid that can be smoothly operated.

[0008]

In order to solve the above problems, a solenoid manual operating device according to the present invention comprises a hollow cylindrical yoke and a pair of magnetic members disposed on both sides of a permanent magnet. A movable iron core disposed on the shaft core of the movable iron core so as to be movable in the axial direction thereof, and an electromagnetic coil housed and arranged inside the magnetic yoke outside the movable iron core with a predetermined gap between the movable iron core and the movable iron core. In the gap between the electromagnetic coil and the movable iron core, when the movable iron core is attracted, a fixed iron core for attracting and returning the movable iron core, the outer peripheral edge of which is fitted inside the lower end of the magnetic yoke, is provided below the electromagnetic coil. Open the periphery of the permanent magnet,
When the movable core is restored, the demagnetization ring is loosely fitted so as to surround the peripheral edge of the permanent magnet over one magnetic member of the movable core, and the movable core is provided at the end of the demagnetization ring in the direction away from the permanent magnet side. In a loosely fitted state, a degaussing ring holding cylinder made of a non-magnetic material that protrudes outward from the end of the movable iron core, and further, on the end side in the direction away from the fixed iron core of the movable iron, An operation button for manual insertion (suction) for arranging the movable iron core at a predetermined distance and pushing the movable iron core to the fixed iron core side by manual operation for suctioning, and the manual insertion operation button For return to the original position of the movable core, which is fitted and held so as to move with the demagnetization ring and is always in contact with the protruding end of the demagnetization ring holding cylinder to move the demagnetization ring to a position where the permanent magnet can be surrounded when the movable core is de-sucked. With the operation button of Are you.

[0009]

According to the above construction, when the movable iron core of the solenoid is manually operated during a power failure or the like, the movable iron core is manually placed with a space between the fixed iron core and the end located on the opposite side. The closing operation button is manually pushed against the force of the compression spring toward the movable iron core side, and the movable iron core is moved to the fixed iron core side, so that the movable iron core is attracted to the fixed iron core by the attraction force of the permanent magnet. In addition, when the suction of the movable iron core is manually released, the demagnetization ring is pushed by pushing the return operation button and the peripheral edge of the permanent magnet inserted between the pair of magnetic members forming the movable iron core. The magnetic flux of the permanent magnets is looped (short-circuited) by the demagnetization ring to reduce the magnetic flux of the permanent magnets by moving them to the magnetic members and surrounding the magnetic members, thereby weakening the attractive force of the permanent magnets. Movable iron Since it is possible to automatically return to the original position by the force of the return spring, at the power failure or the like, it is convenient because the manual operation of the self-hold solenoid can be performed quickly and easily.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, 11 is a self-holding solenoid equipped with the manual operation device of the present invention. Reference numeral 12 denotes a cylindrical bobbin around which the electromagnetic coil 13 is wound.
At one open end (lower part in FIG. 1), a recessed hole 14a for accommodating a lower part of a movable iron core 17 described later and a vertical hole a through which a movable rod 19 projecting to the lower part of the movable iron core 17 penetrates are provided. The fixed iron core 14 is provided, and the other open end (upper side in FIG. 1)
An auxiliary yoke 15 is arranged above the bobbin 12 so as not to close the hollow hole of the bobbin 12. On the outside of the electromagnetic coil 13, a hollow cylindrical magnetic yoke 16 surrounding the coil 13 is fitted and held on the auxiliary yoke 15 and the fixed iron core 14. Then, as shown in FIG. 1, the fixed iron core 14 is fitted and held in the lower opening end of the magnetic yoke 16 via the cushioning material in the lower portion of the bobbin 12, and the auxiliary yoke 15 has the seal member placed on the upper portion thereof. It is mounted and fixed on the bobbin 12 by a retaining ring 15a which is fixed to the inside of the upper opening end of the magnetic yoke 16 through.

As shown in FIG. 1, the movable iron core 17 is provided with a first magnetic member b on the fixed iron core 14 side and a second magnetic member c on the auxiliary yoke 15 side, and
A permanent magnet 18 is formed between these two magnetic members b and c, and when assembled, as shown in FIG.
The first magnetic member b is fitted and held in a locking step portion d formed in the substantially central portion of the movable rod 19 penetrating the vertical hole a of the fixed iron core 14, and then, from the upper end of the movable rod 19, the first magnetic member b is inserted. The permanent magnet 18 is loosely mounted on the first magnetic member b, and finally, the screw portion e provided on the upper side of the movable rod 19 is mounted.
The second magnetic member c is attached to the movable rod 1 as shown in FIG.
9 is assembled by screwing the second magnetic member c onto the second magnetic member c without projecting the bobbin 12 around which the electromagnetic coil 13 is wound.
Is movably fitted in the hollow hole of the above with a predetermined gap f maintained.

Reference numeral 20 denotes a bottomed cylindrical bearing member fixed to the lower side of the fixed iron core 14 via a retaining ring g, and a through hole communicating with the vertical hole a of the fixed iron core 14 is bored in the bottom surface of the center portion thereof. The movable rod 19 is satisfactorily penetrated and supported together with the vertical hole a. 21
Is a degaussing ring fitted in the gap f between the outer periphery of the movable iron core 17 and the hollow hole of the bobbin 12, and this degaussing ring 21
As shown in FIG. 1, an upper end of the auxiliary demagnetization ring holding cylinder 22 formed in a cylindrical shape using a non-magnetic material such as brass is attached to the auxiliary yoke at the outer peripheral edge of the second magnetic member c of the movable iron core 17. The movable iron core 17 is loosely fitted and held by being fitted at a position corresponding to 15. At this time, the demagnetization ring 21
As shown in FIG. 1, the connection between the lower end of the magnet and the holding cylinder 22 is such that the joint h between the degaussing ring 21 and the holding cylinder 22 is connected to the permanent magnet 18 before the movable iron core 17 is attracted. The permanent magnet 18 and the movable iron core 1 are matched with the upper edge.
7 and a part of the first magnetic member b is the demagnetization ring 21.
When the movable iron core 17 is attracted to the fixed iron core 14 as shown in FIG. 2, the lower edge of the degaussing ring 21 is located on the upper edge side of the permanent magnet 18, and The degaussing ring 21 is set so as not to surround the permanent magnet 18.

The loose fitting position of the demagnetization ring 21 with respect to the movable iron core 17 before and after the attraction of the movable iron core 17 is as follows.
The biasing force of the ring return spring 23 inserted between the lower end of the degaussing ring 21 and the fixed iron core 14, and the degaussing ring holding cylinder 22.
It is set by a cap 24, which will be described later, of the solenoid 11 that abuts on the upper end of the solenoid 11 and regulates its upward movement. And
The cap 24 is a collar formed on the periphery of the upper opening end of the outer casing case 25 that covers and houses the magnetic yoke 16 having the solenoid main body A including the fixed and movable iron cores 14 and 17 and the electromagnetic coil 13 from the outside. It is screwed to a screw portion 27 on the outer periphery of the portion 26.

The outer case 25 is a solenoid body A.
The lower end of the magnetic yoke 16 having a built-in can be closed by the bearing member 20 by engaging the lower end of the magnetic yoke 16 with the engaging portion 28 in the lower portion of the outer casing 25.
Further, since the upper opening end is formed so as to be closed by the cap 24 screwed to the screw portion 27 on the outer periphery of the collar portion 26, the solenoid main body A can be reliably protected from intrusion of water or dust. As shown in FIG. 1, the cap 24 screwed to the collar portion 26 has the screw portion 2 of the collar portion 26.
7, an outer cylinder 29 having a threaded portion screwed therein and an inner cylinder 30 slidably contacting the inner peripheral surface of the upper opening end of the jacket case 25.
And a manual return operation button 31 of the movable iron core 17 which is fixedly inserted into the inner cylinder 30 by receiving the upper edge of the demagnetization ring holding cylinder 22, and the inner circumference of the opening end of the demagnetization ring holding cylinder 22. The manual return operation button 31 is slidably fitted to the surface,
It is configured by a manual insertion operation button 32 of the movable iron core 17 that is irremovably locked to the cap 24, and by screwing the cap 24 into the outer case 25, the cap 24 can be manually returned and manually inserted. Since the operation buttons 31 and 32 are integrally provided so as not to be pulled out, the solenoid 11 can be closed satisfactorily in a state where the upper portion of the solenoid 11 can be manually operated.

In FIG. 1, 33 is a movable iron core 17
And a bearing member 20. The original position return spring of the movable iron core 17 is inserted between the movable iron core 17 and the bearing member 20, and the operation button return 34 is inserted between the cushioning material 35 fixed to the upper end of the movable iron core 17 and the manual insertion operation button 32. A spring 36 is a mounting member provided on a device (not shown) of the solenoid 11. The solenoid 11 is, for example, inserted into the through hole 37 of the mounting member 36 and provided from the lower side of the body of the casing 25 to the upper side thereof. It can be attached by screwing the tightening nut 38 into the threaded portion. Further, 39 is a locking step portion for restricting the downward movement range of the holding tube 22 provided substantially at the center of the outer periphery of the body of the degaussing ring holding tube 22, and this locking step portion 39 is the upper end of the auxiliary yoke 15. When the movable iron core 17 is attracted, the position of the demagnetization ring 21 when the movable iron core 17 is attracted is determined by the first and second magnetic members b, whose peripheral edges are located above and below the permanent magnet 18, as shown in FIG. It is set so that it can be surrounded by c.

Next, the operation of the device of the present invention will be described. When the solenoid 11 is first operated by energization, a forward current in the direction of attracting the movable core 17 to the fixed core 14 is supplied to the electromagnetic coil 13 in FIG.
As a result, the magnetic yoke 16 → the auxiliary yoke 15 → the degaussing ring 21 → the first magnetic member b of the movable iron core 17 → the fixed iron core 1
4, a magnetic flux flowing in this closed magnetic path exerts an attractive force on the movable iron core 17, and the movable iron core 17 is attracted to the fixed iron core 14 side against the force of the home position return spring 33. Suction to the fixed iron core 14.

In this way, when the movable iron core 17 is attracted to the fixed iron core 14, the movable rod 19 fitted to the movable iron core 17 also moves at the same time, and a load member (not shown) connected to the tip of the movable rod 19 (for example, an electric motor). Shutter brake on,
Operate the release lever or the circuit breaker closing / tripping rod).

The movable iron core 14 is fixed to the fixed iron core 17.
Even if the electromagnetic coil 13 is de-energized, the magnetic flux of the permanent magnet 18 continues to be transmitted into the closed magnetic circuit, so that the movable iron core 17 is attracted by the permanent magnet 18 as shown in FIG. Is retained.

As described above, the solenoid 11 overcomes the force of the original position return spring 33 by the attraction force of the permanent magnet 18 and maintains the self-holding state even after the energization of the electromagnetic coil 13 is cut off. It is a thing.

Next, the case where the load member is returned to the state before the movable iron core 17 is sucked, that is, the original position will be described. In this case, the attraction force of the permanent magnet 18 that holds the movable iron core 17 on the fixed iron core 14 by suction may be reduced so that the force of the home position return spring 33 may be overcome. In the state of FIG. 2, a current that is smaller than the energizing current at the time of attraction and has a reverse energizing direction is instantaneously applied to the electromagnetic coil 13 to induce a magnetic flux that cancels the magnetic flux of the permanent magnet 18. Therefore, when the attractive force of the permanent magnet 18 to the movable iron core 17 decreases or becomes zero, the movable iron core 17 is released from the fixed iron core 14 due to the urging force of the return spring 33, and as shown in FIG. As shown, it is returned to the original position by being received by the lower end edge of the manual insertion operation button 32 via the cushioning material 35.

The movable iron core 17 is first released from the attracted state with the fixed iron core 14 by the above-mentioned operation, and is rapidly returned to the original position by the urging force of the return spring 33. As a result, the load member (not shown) connected to the movable rod 19 can be returned to the original position.

Next, a description will be given of a case where the solenoid 11 is manually sucked or restored when a power failure occurs, inspection of equipment or the like. First, in a state before the movable iron core 17 shown in FIG. 1 is sucked, the movable iron core 17 is pushed down against the force of the original position return spring 33 by pushing the manual closing operation button 32 constituting the cap 24 with a finger or the like. Then, the movable iron core 17 is attracted to the fixed iron core 14 using the attraction force of the permanent magnet 18, as shown in FIG. As described above, in the present invention, when the movable iron core 17 is manually sucked, the cap 24 coated to protect the upper portion of the solenoid 11 from the intrusion of water or the like should not be pulled out at the upper portion of the movable iron core 17. The movable iron core 17 can be easily attracted to the fixed iron core 14 by a simple operation such as pressing the manual insertion operation button 32 that is fitted and held in the.

Next, a case will be described in which the movable iron core 17 sucked by the fixed iron core 14 is manually released to return to the original position. In this case, as shown in FIG. 2, the manual return operation button 31 of the cap 24 is pushed down while the movable iron core 17 is attracted to the fixed iron core 14.
Then, the operation button 31 moves down in cooperation with the manual closing operation button 32 that is retained and fitted in the button 31 in a non-removable manner, and descends, and the demagnetization ring holding cylinder 22 that is in contact with the lower end of the return operation button 31.
Is lowered against the force of the ring return spring 23, and the locking step portion 39 of the demagnetization ring holding cylinder 22 causes the auxiliary yoke 15 to move.
When the upper end of the holding cylinder 22 comes into contact with the holding cylinder 22 as shown in FIG.
As shown in FIG. 4, the degaussing ring 21 fitted on the magnet reaches the position surrounding the permanent magnet 18 straddling the first and second magnetic members b and c of the movable iron core 17.

As described above, when the degaussing ring 21 surrounds the permanent magnet 18, a part of the magnetic flux of the permanent magnet 18 becomes a part of the magnetic flux of the permanent magnet 18 → the first magnetic member b → the degaussing as shown in FIG. The magnetic flux Φa will flow along the route from the ring 21 to the second magnetic member c. That is, the magnetic flux Φm of the permanent magnet 18 is
A part of it loops (short circuit) due to the presence of the degaussing ring 21.
Is divided into the magnetic flux Φa flowing through the degaussing ring 21,
The magnetic flux does not contribute to the attractive force of the permanent magnet 18. Therefore, the attraction force of the permanent magnet 18 is reduced by the split magnetic flux Φa, and when the force of the home position return spring 33 is overcome, the movable iron core 17 can be easily returned to the home position.

As described above, when the movable iron core 17 is manually returned to its original position, the present invention uses the degaussing ring 21 to short-circuit a part of the magnetic flux of the permanent magnet 18 so that it does not contribute as an attractive force. Therefore, the movable iron core 17 can be easily manually returned by the force of the original position return spring 33 overcoming the reduced attraction force of the permanent magnet 18. In FIGS. 1 and 2, when the movable iron core 17 is attracted and returned by energization, the demagnetization ring 21 is not arranged so as to loop with the movable iron core 17 as described above. There is no possibility that the suction force is reduced to hinder the suction / return operation of the movable iron core 17.

[0026]

As described above, according to the present invention, even if the positive current is applied to the electromagnetic coil to attract the movable iron core to the fixed iron core, and after the attraction of the movable iron core is stopped, the current is stopped. When the movable core is returned to its original position by holding the attracted state by the attractive force of the permanent magnets provided on the iron core, on the contrary, a reverse current is applied to the electromagnetic coil to attract and hold the movable iron core. In a solenoid that reduces the suction force of to return the movable iron core to its original position,
A gap of a predetermined size is formed between the movable core and the electromagnetic coil, and a degaussing ring for short-circuiting the magnetic flux of the permanent magnet provided in the movable core is loosely fitted in the gap so as to be movable along the movable core. , When the movable iron core is manually returned, the demagnetization ring is moved to a position surrounding the permanent magnet of the movable iron core, and with this demagnetization ring, the magnetic flux of the permanent magnet is short-circuited so that the attractive force is reduced. It is convenient because the solenoid can be easily operated manually at the time of power failure or inspection before starting work.

Further, in the manual operating device of the present invention, a degaussing ring is loosely fitted between the movable iron core and the electromagnetic coil so as not to hinder the movement of the movable iron core, and the degaussing ring is a solenoid. Since it can be easily moved from the outside, the solenoid can be manually operated from the outside quickly and surely even in the event of a power failure, etc.
It can be operated well.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a self-holding solenoid having a manual operation device according to the present invention.

FIG. 2 is a vertical sectional view showing a suction state of the self-holding solenoid shown in FIG.

FIG. 3 is a vertical cross-sectional view of a self-holding solenoid showing a state in which a movable iron core is attracted to a fixed iron core by the manual operating device of the present invention.

FIG. 4 is a vertical cross-sectional view of the self-holding solenoid showing a state in which the movable manual core is released from the fixed core by operating the manual operating device of the present invention to return the movable core to the original position.

FIG. 5 is a perspective view showing a main part of a movable iron core.

FIG. 6 is an explanatory diagram showing a schematic configuration of a conventional self-holding solenoid.

[Explanation of symbols]

 11 Solenoid 13 Electromagnetic Coil 14 Fixed Iron Core 17 Movable Iron Core 18 Permanent Magnet 21 Degaussing Ring 22 Degaussing Ring Holding Tube 24 Cap 31 Manual Return Operation Button 32 Manual Insertion Operation Button b First Magnetic Member c Second Magnetic Member f Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichiro Mochizuki 1 Aichi-cho, Aichi-cho, Kasugai-shi, Aichi Prefectural company (72) Inventor Takehide Miyajima 1-ichi Aichi-cho, Kasugai-shi, Aichi Aichi-denki Co., Ltd.

Claims (2)

[Claims] 1. A movable iron core is movably arranged in an electromagnetic coil, and a fixed iron core for attracting and returning the movable iron core is provided in one of the moving directions of the movable iron core, and a magnetic field is closed outside the fixed iron core and the electromagnetic coil. In a solenoid formed by inserting a road-shaped magnetic yoke, the movable iron core includes a pair of magnetic members,
Formed by a permanent magnet interposed between the magnetic members,
When the movable iron core is inserted into the electromagnetic coil with a predetermined gap from the inner peripheral surface of the coil and the movable iron core is manually returned to the gap between the movable iron core and the electromagnetic coil, the first, A manual operation device for a solenoid, wherein a demagnetization ring for short-circuiting a magnetic flux of a permanent magnet inserted between the second magnetic members is loosely movably fitted. 2. A ring return spring for urging the degaussing ring in a direction in which the degaussing ring is always moved away from the position of the permanent magnet, and a degaussing ring on the opposite side of the ring return spring are connected to the gap where the degaussing ring is loosely fitted. And a demagnetization ring holding cylinder made of a non-magnetic material that is fitted into the movable iron core, and the demagnetization ring holding cylinder is fitted on the top of the demagnetization ring against the return spring to a position surrounding the peripheral edge of the permanent magnet. A pushable manual operation button is attached, and by this manual operation button, the demagnetization ring is moved to a position where the permanent magnet of the movable iron core can be surrounded, the magnetic flux of the permanent magnet is short-circuited, and the movable iron core is fixed. 2. The manual operating device for a solenoid according to claim 1, wherein the attraction force for the solenoid is reduced to return to the original position.