JP4800105B2 - Electromagnet device - Google Patents

Description

  The present invention relates to an electromagnet device related to a technique of pressing a connecting portion with plungers extending from a plurality of electromagnets.

Conventional circuit breaker such as a vacuum circuit breaker is more constructed a cutoff portion and the operation mechanism unit. For example, the blocking portion includes a fixed electrode and a movable electrode in a vacuum valve, and a rod extends outside the vacuum valve from these electrodes. The movable electrode is connected to the movable rod. The movable rod is connected to a mechanical operation mechanism through an insulating rod. The operating mechanism is operated to drive the movable rod, and the movable electrode is inserted into the fixed electrode.

  Since this operation mechanism part is mainly configured by combining a lever, a cam, a link, a shaft and the like, the mechanism part becomes complicated, and its assembly and maintenance are not easy.

  Therefore, recently, an electromagnet has been used in place of the operation mechanism. The electromagnet body has an exciting coil. When power is supplied to the excitation coil and the plunger is driven by the magnetic attractive force of magnetic flux generated when circulating in the magnetic path, and the one side lever is pressed, the other side lever is connected to the plunger via the fulcrum shaft. Pressing in the opposite direction, the movable rod is driven according to the drive of the insulating operation rod, and the movable electrode is inserted into the fixed electrode.

  When driving a plurality of vacuum circuit breakers with an electromagnet, in order to drive a plurality of vacuum circuit breakers with a single electromagnet, a large amount of exciting current is required, resulting in an increase in size. If the size is increased, there are restrictions on the arrangement in the apparatus, and there are models that cannot increase the size of the electromagnet. Therefore, an electromagnet device that uses a plurality of electromagnets to be adaptable to each model is known.

  In the electromagnet device using a plurality of electromagnets, as shown in FIG. 6, the plunger shafts 102 of the plurality of electromagnet devices 101 are connected via a connecting portion 103. That is, a plurality of through-holes 104 are formed in the connecting portion 103, the distal end portions of the plunger shafts 102 of the electromagnets are inserted into the through-holes 104, and the connecting portion 103 is sandwiched between the distal end portions to prevent the connecting portions 103 from being pulled out. A blocking unit 105 is disposed.

Then, by simultaneously operating the connecting portion 103 with the blocking portions 105 of the plurality of plunger shafts 102, the total magnetic attraction force of the plurality of plunger shafts 102 is used to fix the fixed electrode 106 and the movable electrode 107 of the vacuum circuit breaker. It is designed to be close to and away from. (For example, Patent Document 1 is known as a circuit breaker using an electromagnet device)
JP 2002-8498

  When the plurality of electromagnets are used, the most serious problem is that the stroke completion position of the plunger shaft 102 of each electromagnet, that is, the contact surface between the blocking portion 105 and the connecting portion 103 of each plunger must be matched exactly. That is. As described above, the blocking unit 105 is arranged so as to sandwich the connecting unit 103. However, the blocking unit 105 has an error in the stroke completion position of the plunger shaft 102 due to an accuracy error of each component. If 105 and the connection part 103 are fixed to a rigid part, distortion stress will be added to the connection part 103, Therefore The gap | interval is provided in the prevention part 105 which pinches | interposes the connection part 103, and the said distortion stress is relieved. For this reason, due to the gap, a time shift occurs in the pressing of the connecting portion 103 by the plunger shaft 102 of each electromagnet, so that the magnetic attractive force of the electromagnet cannot be fully exhibited, and the energy of the electromagnet is wasted. It was. An object of the present invention is to provide an electromagnet device that absorbs the error even when there is a slight error in the stroke completion position of the plunger shaft of each electromagnet, exhibits a sufficient magnetic attraction, and saves electromagnet energy. There is to do.

The invention of claim 1 connects a plurality of electromagnets that drive plungers provided in the magnetic path body by magnetic flux generation means, and plunger shafts connected to the plungers of these electromagnets, to the electromagnet connecting portion, In the electromagnet device that drives each plunger and presses the electromagnet connecting portion by the plunger shaft ,
When the plunger shaft adjusts the pressing time during which each plunger shaft presses the electromagnet connecting portion between the plunger and the electromagnet connecting portion, and an error occurs in the stroke completion position of each plunger shaft, the error is generated. An adjustment spring that absorbs water is disposed.

According to a second aspect of the present invention, in the electromagnet device according to the first aspect, the adjustment spring is interposed between a pair of support seats attached to the plunger shafts, and the plunger shafts are used for the electromagnets. A support seat is further attached to an end portion that is inserted into the through hole of the communication portion and penetrates the through hole.

A third aspect of the present invention is the electromagnet device according to the first or second aspect, wherein a coil spring is used as the adjustment spring.

According to the electromagnet device of the present invention , the stroke of each plunger shaft is completed by adjusting the pressing time during which each plunger presses the connecting portion by the adjusting means arranged between the plunger and the connecting portion. Even if an error occurs in the position, the error is absorbed and the pressing force of all the plungers is transmitted almost simultaneously to the connecting portion, so that the magnetic attraction force of the magnet can be fully exerted and the magnet can be saved. it can.

According to the electromagnetic device of the present invention, while the plunger has reached the fast adjusting spring in the plunger is released presses the contact portion while against the spring pressure of the adjusting spring, from said plunger Since the delayed other plungers press the adjustment spring , the pressing force of all the plungers is transmitted to the connecting portion via the adjustment spring.

An embodiment of the present invention will be described with reference to FIGS. Figure 1 is a plan view of a vacuum circuit breaker according to the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 3 is an enlarged view of a main part of FIG. 2, FIG. 4 is the cross section of the electromagnet 3 A, 3 B 5A is a plan view of the lever, and FIG. 5B is a side view of the lever.

  1 and 2, the vacuum circuit breaker 1 is plunger-connected to the vacuum valves 2A, 2B, and 2C of each phase and the plurality of electromagnets 3A and 3B and the electromagnets 3A and 3B having the plunger according to the present invention. The electromagnet device 3 is composed of a lever 21 and the like.

  The vacuum valves 2A, 2B, and 2C of the respective phases are supported by the support 4 having the disconnecting contacts 5 and 6 below the movable part of the vacuum valve and the fixed part up, respectively. It arrange | positions in the front side on the trolley | bogie 7 so that the contacts 5 and 6 may become front facing. The first electromagnet 3A is disposed on the rear side between the vacuum valves 2A and 2B, and the second electromagnet 3B is disposed on the rear side between the vacuum valves 2B and 2C.

  A fixed electrode 8 and a movable electrode 9 are arranged in the vacuum valves 2A, 2B and 2C (hereinafter referred to as vacuum valve 2), and the fixed rod 10 and the movable rod 11 protrude from the electrodes 8 and 9 outside. ing. The movable rod 11 is movable in the axial direction by a bellows 12. An insulating operation rod 14 is connected to the movable rod 11 via an insulating portion 13 made of an insulator.

  As shown in FIG. 3, the insulating operation rod 14 includes a contact pressure adjusting spring 15 that presses the movable electrode 9 against the fixed electrode 8. The contact pressure adjusting spring 15 and the metal fitting seat 16 are inserted into the insulating operation rod 14, and further, the through hole 18 (FIG. 5) of the blocking connecting shaft 17 of the lever 21 described later is inserted. The distal end portion of the insulating operation rod 14 is a threaded distal end portion 14A. The support seat 20 is fastened to the threaded tip 14A with a nut 19 to prevent the lever 21 from being detached from the insulating operation rod 14.

  Next, the electromagnet device 3 will be described. The electromagnet device 3 includes a lever 21 having a connecting portion (shaft) 23 for communicating the first and second electromagnets 3A and 3B and the plunger shaft 44 of the first and second electromagnets 3A and 3B, The second electromagnets 3A and 3B include an adjustment spring 49 as an adjustment means for adjusting the operation timing of the connecting portion 23 by the plunger shaft 44.

  As shown in FIG. 4, the first and second electromagnets 3 </ b> A and 3 </ b> B form a magnetic path main body 31 with a cylindrical magnetic enclosure. An upper end magnetic path 32 and a lower end magnetic path 33 are arranged at the upper and lower ends of the magnetic path main body 31 so as to block the respective ends. A magnetic path 34 is formed by the magnetic path main body 31 and the end magnetic paths 32 and 33. Annular recesses 32A and 33A are formed on the inner surfaces of the end magnetic paths 32 and 33, and the ends of the cylindrical magnetic path main body 31 are fitted into the annular recesses 32A and 33A. An axial magnetic path 35 that protrudes along the axial direction toward the lower end magnetic path 33 is formed in the upper end magnetic path 32. It can be said that the axial magnetic path 35 is a fixed magnetic path or a fixed iron core. An axial hole 36 is formed in the axial magnetic path 35 and the end magnetic paths 32 and 33. The axial magnetic path 35 is attached to the upper end magnetic path 32 by a bolt 37. An intermediate magnetic path portion 38 protruding in the inner diameter direction from the middle of the magnetic path main body is formed, and forms a part of the magnetic path 34. The axial magnetic path 35 may be omitted and the end magnetic path 32 may be used as a fixed iron core.

  A first exciting coil 39 is disposed between the upper end magnetic path 32 and the intermediate magnetic path 38 facing the axial magnetic path 35. Between the lower end magnetic path 33 and the intermediate magnetic path section 38, a starting magnet 40 and a second excitation coil 41 made of a ring-shaped permanent magnet are arranged. A support fitting 42 is disposed between the starting magnet 40 and the second excitation coil 41. The starter magnet 40 and the second exciting coil 41 are supported between the lower end magnetic path 33 and the intermediate magnetic path section 38 by the support fitting 42. The support fitting 42 is disposed and supported in the lower end magnetic path 33.

  A plunger 43 is disposed on the inner peripheral side of the first excitation coil 39, the second excitation coil 41, and the starting magnet 40. The plunger 43 can also be referred to as a movable magnetic path or a movable iron core. The axial dimension of the plunger 43 is shorter than the axial dimension of the axial magnetic path 35. Plunger shafts 44 are attached to both ends of the plunger 43. The plunger shaft 44 extends through the shaft hole 36 to the outside. The shape of the shaft hole 36 is an axial passage arbitrarily formed according to the shape of the plunger shaft 44 such as an ellipse other than a round shape or a polygonal shape. The protruding contact surface 45 on the upper surface of the plunger 43 that contacts the lower surface of the axial magnetic path 35 is formed on an uneven surface and disperses the magnetic flux Φ.

  When an exciting current in the same direction is supplied to the first exciting coil 39 and the second exciting coil 41, the magnetic flux Φ generated by this exciting current circulates in the magnetic path 34 via the intermediate magnetic path portion 38 and the starting magnet 40, An electromagnetic attractive force is generated between the axial magnetic path 35 and the plunger 43, and the plunger 43 is attracted and held by the axial magnetic path 35. Further, when the exciting current of the second exciting coil 41 is reversed, an electromagnetic repulsive force is generated between the axial magnetic path 35 and the plunger 43 and instantaneously moves downward.

  Next, the lever 21 that connects the plunger shaft 44 of the first and second electromagnets 3A and 3B and the insulating operation rod 14 of the vacuum valves 2A, 2B, and 2C will be described.

As shown in FIG. 5, the lever 21 is two support plates 21A, made of 21B, the two support plates 21A, side cross-sectional arcuate transverse direction of the breaker for connection axis 17 in front of the 21B It is formed, the through hole 18 is provided in the circuit breaker for connection axis 17. A lateral electromagnet connecting portion (shaft) 23 having a circular arc cross section is formed at the rear of the support plates 21A and 21B. The electromagnet connecting portion 23 includes first and second electromagnets 3A and 3B. A through hole 24 for inserting the plunger shaft 44 is provided. A plurality of through holes 25 for attaching the lever 21 to the fulcrum shaft 22 (FIG. 3) are provided in the middle part before and after the support plates 21A and 21B. The lever 21 including the support plates 21A and 21B is provided with the fulcrum shaft 22. Are attached with bolts 26 and nuts 27.

As shown in FIG. 3, the plunger shaft 44 of the electromagnets, the support seat 47, inserts the adjustment spring 49 and the support seat 48, further through holes 24 and the support seat 51 of the electromagnets for communicating portion 23 of the lever 21 inserted through and tightened in the nut 50 to the distal end of the plunger shaft 44, for connecting the plunger shaft 44 of each electromagnet electromagnets for communicating portion 23 of the lever 21.

Breaker for contact axis 17 of the lever 21 is in communication with the insulated operating rod 14 of each phase vacuum valve 2. The fulcrum shaft 22 extends from the front side to the back side of the paper, is rotatably supported by a chassis (not shown) of the vacuum circuit breaker, and serves as a fulcrum.

  The two support plates 21A and 21B of the lever 21 are configured so that the thickness portion T is disposed in the plunger driving direction. Here, the thickness portion T is shorter than the width portion W in the direction perpendicular to the plunger drive direction, and is configured in the same direction as the plunger drive direction. Compared to the case where the width portion W is arranged in the height direction, if the thickness portion T is arranged in the height direction as in the present invention, the height direction is not increased, and the center of gravity of the electromagnet device and the vacuum circuit breaker is lowered. The vibration at the time of opening and closing the vacuum circuit breaker can be reduced, and the earthquake resistance can be improved.

Next, the operation of the electromagnet device 3 will be described. When an exciting current in the same direction is supplied to the first exciting coil 39 and the second exciting coil 41 of the first and second electromagnets 3A and 3B, the generated magnetic flux Φ passes through the intermediate magnetic path portion 38 and the starting magnet 40. The plunger 43 of the first and second electromagnets 3A and 3B is attracted to and contacts the axial magnetic path 35 by the magnetic attractive force of the generated magnetic flux circulating in the magnetic path 34. When an exciting current is supplied to the second exciting coil 41 so as to generate a magnetic flux repelling the magnetic flux Φ generated by the first exciting coil, a magnetic flux repelling the magnetic flux Φ circulating in the magnetic path is generated in the plunger 43. jar 43 is driven in the axial direction (downward) instantaneously by the repulsive force, the plunger shaft 44 to press the electromagnets for communicating portion 23 of the lever 21 downward via the adjusting spring 49. When electromagnets for communicating portion 23 is pressed downward, the lever 21 is rotated about the pivot shaft 22, via a contact-pressure adjusting spring 15 breaker contact axis 17 of the lever 21 is rotated upward The movable rods of the vacuum valves 2A, 2B, and 2C are driven upward, and the movable electrode 9 is inserted into the fixed electrode 8.

First, second electromagnets 3A, if the time lag to the pressing of the electromagnets for communication section 23 by the plunger 43 of 3B has occurred, for example, from the first plunger shaft 44A of the second plunger shaft 44B If the move is delayed, in the prior art, a first plunger shaft 44A pushes the faster connection portion 23 and the second plunger 44B, lever before the second plunger shaft 44B presses the electromagnets for communicating portion 23 during 21 but there is a risk to complete the operation, in the present invention the adjustment spring 49 is to first plunger shaft 44A pushes the electromagnets for contact portion 23 while pushing the spring pressure of the adjusting spring 49, the second plunger shaft 44B delayed from the first plunger shaft 44A presses the adjusting spring 49 transmits, electromagnets 3A, the pressing force generated by the 3B via the adjustment spring 49 to electromagnets for communicating portion 23 The Since that, the electromagnets 3A, be sufficiently use magnetic repulsion force for driving the 3B plunger, can reduce this amount electricity consumption, it is possible to save energy of the electromagnet. In addition, the electromagnet device can be reduced in size.

In the present invention, the case where the coil spring is used as the adjusting spring 49 as the adjusting means for the pressing time (pressing force time) during which the plunger presses the connecting portion of the lever is shown, but the pressing force of each plunger shaft 44A, 44B is shown. Since the time only has to be adjusted, the adjusting means may be any means that can adjust the pressing time of the plunger such as rubber and flexible synthetic resin member in addition to the coil spring . In addition to the above-described embodiments, it goes without saying that the present invention can also be used for electromagnetic devices of switches such as load switches, disconnecting parts, vacuum switches, and the like. Moreover, it is applicable also when using the magnet which uses a permanent magnet. As described above, according to the electromagnet device of the present invention, the magnetic repulsion force is increased by the provision of the pressing time adjusting means, and the electromagnet device can be reduced in size or energy saving.

The top view of the vacuum circuit breaker concerning the embodiment of the present invention. Sectional drawing of the principal part of FIG. The enlarged view of the principal part of FIG. Cross section of electromagnet device (A) is a top view of a lever, (B) is a side view of a lever. Explanatory drawing of a prior art example.

DESCRIPTION OF SYMBOLS 1 ... Vacuum circuit breaker 2, 2A, 2B, 2C ... Vacuum valve, 3 ... Electromagnet apparatus, 3A, 3B ... Electromagnet with a plunger, 8 ... Fixed electrode, 9 ... Movable electrode, 10 ... Fixed side rod, 11 ... Movable rod, 12 ... Bellows, 13 ... Insulator, 14 ... Insulating operation rod, 14A ... Tip with screw, 15 ... Contact pressure adjusting spring, 16 ... Bracket seat, 17 ... Contact shaft for circuit breaker, 18 ... Through hole, DESCRIPTION OF SYMBOLS 19 ... Nut, 20 ... Support seat, 21 ... Lever, 22 ... Supporting shaft, 23 ... Electromagnetic stone connection part, 24, 25 ... Through-hole, 26 ... Screwed bolt, 27 ... Nut, 31 ... Magnetic path main body, 32 ... upper end magnetic path, 32A ... annular recess, 33 ... lower end magnetic path, 33A ... annular recess, 35 ... axial magnetic path, 36 ... axial hole, 37 ... bolt, 38 ... intermediate magnetic path, 39 ... First exciting coil, 40 ... starting magnet, 41 ... second exciting coil 42 ... Bracket, 43 ... plunger, 44 ... plunger shaft, 45 ... contact surface, 46 ... nut, 47, 48 ... support seat, 49 ... adjusting spring, T ... thickness portion, [Phi ... flux.

Claims (3)

A plurality of electromagnets for driving plungers provided in the magnetic path body by the magnetic flux generating means, and plunger shafts connected to the plungers of these electromagnets are connected to the electromagnet connecting portion, and each plunger is driven to In the electromagnet device that presses the electromagnet connecting portion by a plunger shaft,
When the plunger shaft adjusts the pressing time during which each plunger shaft presses the electromagnet connecting portion between the plunger and the electromagnet connecting portion, and an error occurs in the stroke completion position of each plunger shaft, the error is generated. An electromagnet device characterized in that an adjustment spring that absorbs water is disposed. The adjustment spring is interposed between a pair of support seats attached to each plunger shaft,
2. The electromagnet device according to claim 1 , wherein each plunger shaft is inserted into a through hole of the electromagnet connecting portion, and a support seat is further attached to an end portion penetrating the through hole. . The electromagnet device according to claim 1, wherein the adjustment spring is a coil spring.

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