JP2014002876A - Electromagnetically operated switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetically operated switching device capable of improving workability for adjusting contact pressure spring, eliminating fastening of a nut with a high torque to prevent loosening of the same with time, and preventing a movable rod from plastically deforming.SOLUTION: An electromagnetically operated switching device including: an electromagnetic operation device; a vacuum circuit breaker 7 to which driving force from the electromagnetic operation device is transmitted via a link mechanism; and a contact pressure spring 68 for keeping contact between a movable electrode 62 and a fixed electrode 61 in the vacuum circuit breaker at a predetermined contact pressure, further includes a circuit breaker lever 41 having one end thereof coupled to a drive rod 22 for transmitting the drive force from the electromagnetic operation device and the other end thereof coupled to an insulation rod 64 and rotatably supported by a shaft 40. The circuit breaker lever and the insulation rod are coupled by clamping the coupling part thereof with an anti-loosening nut 51 and a nut 66 both screwed to the insulation rod, and a coupling position on the insulation rod for the circuit breaker lever and the insulation rod is adjusted by the anti-loosening nut.

Description

  The present invention relates to an electromagnetically operated switchgear, and more particularly to an electromagnetically operated switchgear suitable for opening and closing a vacuum circuit breaker using the electromagnetic force of the electromagnetically operated device.

  In an electromagnetically operated switchgear that opens and closes an electrode by using the electromagnetic force of the electromagnetic operating device, the movable electrode becomes a fixed electrode when the main contact obtained by bringing the movable electrode into contact with the fixed electrode of the switchgear is turned on. It is necessary to press and maintain a predetermined contact pressure between both electrodes. Patent Document 1 discloses a mechanism for adjusting a stored amount of a contact pressure spring so as to maintain a predetermined contact pressure between both electrodes.

  This Patent Document 1 describes a contact pressure mechanism that accumulates a contact pressure spring disposed on a movable rod shaft that drives a movable electrode in a closed state and presses the movable electrode against the fixed electrode by this accumulated force. Yes. The amount of stored energy of the contact pressure spring described in Patent Document 1 is adjusted by the connection position between the movable rod and the drive lever.

  That is, in the mechanism for adjusting the contact pressure described in Patent Document 1, a thread is provided on the movable rod, and the drive lever is sandwiched between two adjustment nuts screwed to the movable rod, thereby driving the movable rod and the drive rod. The stored amount of the contact pressure spring in the closed state is adjusted by connecting the lever and adjusting the position where the two adjusting nuts are tightened.

Japanese Patent Laid-Open No. 11-40013

  However, in the mechanism for adjusting the contact pressure described in Patent Document 1 described above, it is necessary to simultaneously tighten the two adjustment nuts screwed to the movable rod for the adjustment, and workability is poor. There are drawbacks. Also, in order to prevent the adjustment nut from loosening over time due to long-term use, it is necessary to tighten the adjustment nut with a high torque. There is a risk of plastic deformation, and there is a drawback that the strength and reliability of the parts are lowered.

  The present invention has been made in view of the above points, and the object of the present invention is not only to improve the workability for adjusting the contact pressure spring but also to tighten the nut with high torque to prevent loosening with time. It is an object of the present invention to provide an electromagnetically operated switchgear that eliminates the need to perform the operation and that does not cause plastic deformation of the movable rod.

  In order to achieve the above object, an electromagnetically operated switchgear according to the present invention includes a movable iron core and a fixed iron core arranged opposite to each other, and a coil that separates or contacts the movable iron core and the fixed iron core according to electromagnetic force. The electromagnetic operating device having the movable electrode and the fixed electrode arranged opposite to each other transmits the driving force accompanying the electromagnetic force from the electromagnetic operating device via a link mechanism including a driving rod, a lever, a shaft, and an insulating rod. A vacuum circuit breaker that is separated or contacted, a movable rod connected to the movable electrode of the vacuum circuit breaker, and the insulating rod, and the contact of the movable electrode to the fixed electrode is set to a predetermined contact pressure. The lever is connected to the drive rod for transmitting a driving force from the electromagnetic operating device, the other end is connected to the insulating rod, and the shaft is connected to the shaft. The connection between the lever and the insulating rod is supported by rotation, and the connecting portion is sandwiched between a locking nut and a nut screwed to the insulating rod, and the locking nut The connecting position of the lever and the insulating rod on the insulating rod is adjusted.

  According to the present invention, not only the workability for adjusting the contact pressure spring is improved, but there is no need to tighten the nut with a high torque to prevent loosening over time, and the movable rod may be plastically deformed. There is an effect that an electromagnetically operated switchgear can be realized.

It is a front view which shows Example 1 of the electromagnetically operated switchgear of the present invention. It is a top view which shows Example 1 of the electromagnetically operated switchgear of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a partial cross section of a first embodiment of an electromagnetically operated switchgear according to the present invention. It is a perspective view which shows the state by which the lever and insulation rod which are employ | adopted as Example 1 of the electromagnetically operated switchgear of this invention are connected via the connection jig. It is sectional drawing which shows the use condition of the locking nut which consists of an eccentric nut with a wedge and a nut double nut with a keyway employ | adopted as Example 1 of the electromagnetically operated switchgear of this invention. It is a side view which shows partially Example 2 of the electromagnetically operated switchgear according to the present invention. FIG. 6 is a side view showing a part of a third embodiment of the electromagnetically operated switchgear according to the present invention.

  The electromagnetically operated switchgear of the present invention will be described below based on the illustrated embodiment. In addition, the code | symbol uses the same code | symbol for the same component in each Example.

  1 to 3 show a first embodiment of an electromagnetically operated switchgear according to the present invention.

  As shown in FIGS. 1 to 3, the electromagnetically operated switchgear 1 of the present invention includes a case 2 formed in a box shape, and the case 2 has an opening 3 on the front side. A front cover (not shown) is detachably fixed to the front side. In the case 2, a capacitor 6 that accumulates electric power for exciting the coil 5 of the electromagnet 4 around the electromagnet 4, and a coil from the capacitor 6 in response to a turn-on command or a cut-off command for the vacuum circuit breaker 7. And a control board 8 for controlling the direction of energization of the current supplied to 5 are arranged separately and independently.

  The electromagnet 4 is fixed to the front portion of the case 2 via ribs 9 using bolts and nuts, and the capacitor 6 and the control board 8 are separately fixed to opposite side surfaces of the case. That is, the capacitor 6 is fixed to the left side surface of the case 2 using a bolt and nut via a belt, and the control board 8 is fixed to the right side surface of the case 2 via a spacer 10 using bolts and nuts. Yes.

  Further, the case 2 houses an auxiliary contact 11 for sending the open / close state of the vacuum circuit breaker 7 to the outside, a state display unit 12 for displaying the open / close state, and a counter 13 for counting the number of open / close operations.

  On the other hand, the secondary plug 14 is fixed to the upper side of the case 2 with bolts and nuts, and the secondary plug 14 is connected to a power cable, a signal cable from a digital relay or an analog relay, and the like. It has become so. The cable 15 is connected to the auxiliary contact 11 and the control board 8.

  The control board 8 receives supply of power from the secondary plug 14 and receives a closing command or an opening command (breaking command) from a digital relay or an analog relay, and performs a logical operation for controlling the driving of the electromagnet 4. A control logic unit, a charge / discharge circuit for charging / discharging the capacitor 6, a relay, a relay contact, and the like for controlling the energization direction of the coil 5 are mounted.

  Further, a light-emitting diode 16 indicating that the charging of the capacitor 6 has been completed is mounted on the control board 8, and an “ON” push button for instructing the vacuum circuit breaker 7 to be turned on manually. A switch 17 and a “cut” push button switch 18 for outputting an opening command (break command) to the vacuum circuit breaker 7 by manual operation are mounted.

  The auxiliary contact 11, the state display unit 12, and the counter 13 are arranged on the side upper part of the electromagnet 4 as a state detection mechanism of the vacuum circuit breaker 7, and are fixed to the auxiliary switch base 55 on the plate 19.

  The fixed electrode 61 and the movable electrode 62 of the vacuum circuit breaker 7 use the driving rod 22, the pair of actuator levers 39, the shaft 40, and the pair of circuit breaker levers to drive the electromagnetic force generated from the electromagnet 4 of the electromagnetic actuator. 41. They are separated or contacted via a link mechanism comprising an insulating rod 63. The drive rod 22 includes a lower drive rod 22A connected to the operating lever 39 by a pin 38, a central drive rod 22B pin-connected to the lower drive rod 22A, and an upper drive rod 22C connected to the central drive rod 22B. The operation rods 22 (lower drive rod 22A, central drive rod 22B, upper drive rod 22C) 22 move from a pair of actuator levers 39, a shaft 40, a pair of circuit breaker levers 41, and an insulating rod 63. It is transmitted to the vacuum circuit breaker 7 through the link mechanism.

  The electromagnet 4 includes a movable iron core 20, a fixed iron core 21, a coil 5, a central drive rod 22B, two movable flat plates 23 and 24, permanent magnets 25, iron-made covers 26 and 27 formed in a cylindrical shape, and an iron support plate. 28, a fixed rod 29, and the like, and the coil 5 is housed in a coil bobbin 31 disposed between the support plate 30 and the cover 27.

  The central drive rod 22 </ b> B is disposed in the central portion of the electromagnet 4, and is disposed along the vertical direction. The upper side of the central drive rod 22 </ b> B is inserted into the through hole 32 of the movable flat plate 24, and the lower side is in the through hole 33 of the cover 27. It is inserted and configured to be movable up and down and slidable. Furthermore, the movable iron core 20 and the movable flat plates 23 and 24 are fixed to the outer peripheral surface of the central drive rod 22B using nuts. As described above, the lower portion of the central drive rod 22B is connected to the lower portion via the pin 34. The drive rod 22A is connected.

  The central drive rod 22B is provided with two large and small movable plates 23 and 24. This increases the facing distance between the upper movable plate 23 and the iron cover 26, thereby making the iron cover 26 larger. This is to reduce the leakage magnetic flux to the head.

  The movable iron core 20 and the two movable flat plates 23 and 24 guided and supported by the central drive rod 22B are fastened with a double nut 50 including an eccentric nut with a wedge and a nut with a key groove on the upper drive rod 22C. It is fixed to the stepped portion generated at the connecting portion between the central drive rod 22B and the upper drive rod 22C.

  Further, a support plate 35 is connected to the lower side of the central drive rod 22B, and a ring-like shape that draws a circle centering on the axis of the central drive rod 22B is provided between the support plate 35 and the base 36. A blocking spring 37 is attached.

  The shut-off spring 37 applies an elastic force for separating the movable iron core 20 from the fixed iron core 21 to the central drive rod 22B via the support plate 35. A permanent magnet 25 is disposed around the movable iron core 20, and the permanent magnet 25 is fixed to the support plate 30. The fixed iron core 21 is fixed to the cover 27 using bolts.

  The pair of operating levers 39 connected to the lower side of the lower drive rod 22A via pins 38 is an element of a link mechanism that converts the transmission direction of the driving force accompanying the electromagnetic force generated from the electromagnet 4. The side opposite to the side connected by the pin 38 is connected to the shaft 40, and a pair of circuit breaker levers 41 are connected to the three phases via the shaft 40 (see FIG. 2). .

  The pair of circuit breaker levers 41 are rotatably supported by a connecting jig 42 via pins 67, and the connecting jig 42 is further provided with an insulating rod 64 in a through hole (not shown) in the axial direction. The insulating rod 64 is provided with a thread, and is screwed into the insulating rod 64 via a locking nut 51 and a spring washer 65, for example, a double nut consisting of an eccentric nut with a wedge and a nut with a keyway. The connecting jig 42 is sandwiched from above and below by the nut 66 and connected.

  FIG. 4 shows a state in which the pair of circuit breaker levers 41 and the insulating rod 64 described above are connected via the connecting jig 42.

  As shown in the figure, the circuit breaker lever 41 and the insulating rod 64 are connected to a square note connecting jig 42 having a through hole in the axial direction by connecting the circuit breaker lever 41 via a pin 67. This is done by inserting an insulating rod 64 into the through hole of the jig 42, which is not shown in FIG. 4, but a locking nut screwed to the insulating rod 64 and a nut via a spring are connected. The jig 42 is sandwiched and connected.

  In addition, a contact pressure spring 68 for keeping the movable electrode 62 in contact with the fixed electrode 61 at a predetermined contact pressure is incorporated in the insulator 43 disposed between the insulating rod 64 and the movable rod 46. The upper side of the insulator 43 is connected to the movable feeder 45 through the flexible conductor 44 and is also connected to the movable rod 46 of the vacuum circuit breaker 7. The movable rod 46 is connected to the movable electrode 62 of the vacuum circuit breaker 7, and the fixed electrode 61 is disposed opposite to the movable electrode 62. The fixed electrode 61 is connected to a fixed rod 63.

  The fixed rod 63 is connected to the fixed feeder 47, the upper contactor 48 is connected to the fixed feeder 47, the lower contactor 49 is connected to the movable feeder 45, and each contactor 48, 49 has a distribution line or the like. The power cable is to be connected.

  Next, a description will be given, with reference to FIG. 5, of the locking nut 51 including the double nut of the eccentric nut with a wedge and the nut with a keyway. In FIG. 5, an insulating rod 64 is inserted into the through hole of the connecting jig 42, and a locking nut 51 made up of an eccentric nut with a wedge and a double nut with a keyway is screwed into the insulating rod 64. The state which has clamped the connection jig | tool 42 is shown.

  As shown in the figure, the loosening prevention nut 51, which is a double nut of a wedged eccentric nut and a keyway nut according to this embodiment, shifts the core in order to give one nut the role of a wedge (shaft The wedge-shaped eccentric nut 51A, which has a convex machining (in which the center O and the axis P of the screw hole P are displaced), and a concave concave machining with a taper in order to serve as the other nut keyway. It consists of a keyed nut 51B.

  By tightening both of them using a locking nut 51 comprising a double nut of an eccentric nut and a key groove nut (tightening a concave-convex nut), the wedge functions smoothly, and what kind of vibration and vibration Can withstand.

  In this embodiment configured as described above, the contact pressure of the movable electrode 62 when the vacuum circuit breaker 7 is closed (the state shown in FIG. 3) is adjusted by the position of the connecting jig 42. The position of the connecting jig 42 is adjusted by the position of a locking nut 51 made up of a double nut consisting of an eccentric nut with a wedge and a nut with a keyway, and the connecting jig 42 is fixed by a spring washer 65 and a nut 66.

  Therefore, as in the present embodiment, by using the locking nut 51 composed of a double nut of a wedged eccentric nut and a keyway nut, the wedged eccentric nut and the keyway screwed to the insulating rod 64 are used. It is no longer necessary to simultaneously tighten the two locking nuts 51 and 66, which are composed of double nuts with attached nuts. If the position of the tool 42 is fixed, fastening can be performed only by moving the nut 66, and workability in tightening with the nut 66 can be improved. In addition, it is possible to suppress the shift of the adjustment position of the connecting jig 42 with time, and to apply a high torque to the tightening of the locking nut 51 and the nut 66 including the double nut of the eccentric nut with a wedge and the nut with a key groove. Since it is not necessary to apply, the plastic deformation of the threaded portion can be suppressed even if the readjustment of the electrode contact pressure is repeated.

  Therefore, according to this embodiment, not only the workability for adjusting the contact pressure spring is improved, but it is not necessary to tighten the nut with a high torque to prevent loosening over time, and the movable rod is plastically deformed. There is an effect that it is possible to realize an electromagnetically operated switchgear that is not likely to be.

  In this embodiment, as the locking nut, a locking nut 51 composed of a double nut consisting of an eccentric nut with a wedge and a nut with a keyway is used. Uses a slit type that grips the mating thread with spring force, or a nut with a gripping function added to the spring structure of the inner nut with a tapered inner / outer double structure nut that reliably captures both sides of the thread. You can also

  FIG. 6 shows a second embodiment of the electromagnetically operated switchgear according to the present invention.

  In the electromagnetically operated switchgear according to this embodiment shown in the figure, the breaker lever 41 and the insulating rod 64 are connected to each other with the breaker lever 41 having an L-shaped cross section having a through hole in the axial direction. The insulation rod 64 is inserted into the through-hole of the circuit breaker lever 41, and the locking nut 51 and the spring washer 65 are composed of a double nut consisting of an eccentric nut with a wedge and a nut with a keyway screwed into the insulation rod 64. A nut 66 via the pin is sandwiched and connected to the circuit breaker lever 41.

  That is, in this embodiment, the operating device lever 39 and the circuit breaker lever 41 of the first embodiment are replaced with one lever 70 and the connecting jig is removed, and the other configuration is the same as that of the first embodiment. .

  Even in the configuration in which one lever 70 and the insulating rod 64 are directly connected as in the present embodiment, a locking nut 51 composed of a double nut of an eccentric nut with a wedge and a nut with a key groove is used for fastening. By using, effects similar to those of the first embodiment described above can be obtained.

  FIG. 7 shows a third embodiment of the electromagnetically operated switchgear according to the present invention.

  The electromagnetically operated switchgear according to the present embodiment shown in the figure is different from the spring washer 65 and the nut 66 in the configuration of the first embodiment in that an eccentric nut with a wedge and a nut with a keyway are also provided at the lower part of the connecting jig 42. The locking nut 51A composed of a double nut is used. Other configurations are the same as those of the first embodiment.

  In the present embodiment configured as described above, the same effects as those of the first embodiment can be obtained.

In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic operation type switchgear, 2 ... Case, 3 ... Opening, 4 ... Electromagnet, 5 ... Coil, 6 ... Capacitor, 7 ... Vacuum circuit breaker, 8 ... Control board, 9 ... Rib, 10 ... Spacer, 11 ... Auxiliary Contact, 12 ... Status display section, 13 ... Counter, 14 ... Secondary plug, 15 ... Cable, 16 ... Light emitting diode, 17 ... "On" pushbutton switch, 18 ... "Off" pushbutton switch, 19 ... Plate 20 ... movable iron core, 21 ... fixed iron core, 22 ... drive rod, 22A ... lower drive rod, 22B ... center drive rod, 22C ... upper drive rod, 23, 24 ... movable flat plate, 25 ... permanent magnet, 26, 27 ... Cover, 28, 30, 35 ... support plate, 29 ... fixed rod, 31 ... coil bobbin, 32, 33 ... through hole, 34, 38, 67 ... pin, 36 ... base, 37 ... shut-off spring, 39 ... lever for actuator -40 ... Shaft 41 ... Circuit breaker lever 42 ... Connection jig 43 ... Insulator 44 ... Flexible conductor 45 ... Movable feeder 46 ... Movable rod 47 ... Fixed feeder 48 ... Upper contactor 49 ... Lower contactor 50 ... Double nut 51 ... Loosening prevention nut 51A ... Eccentric nut 51B ... Nut with keyway 55 ... Auxiliary switch base 61 ... Fixed electrode 62 ... Movable electrode 63 ... Fixed rod 64 ... Insulating rod, 65 ... spring washer, 66 ... nut, 68 ... contact pressure spring, 70 ... lever.

Claims (6)

An electromagnetic operating device having a movable iron core and a fixed iron core arranged opposite to each other and a coil for separating or contacting the movable iron core and the fixed iron core according to electromagnetic force, and a movable electrode and a fixed electrode arranged opposite to each other, A vacuum circuit breaker in which a driving force associated with the electromagnetic force from the electromagnetic operating device is transmitted via a link mechanism including a drive rod, a lever, a shaft, and an insulating rod and separated or contacted; and a movable electrode of the vacuum circuit breaker; A contact pressure spring disposed between the movable rod connected to the insulating rod and maintaining the contact of the movable electrode with the fixed electrode at a predetermined contact pressure;
The lever has one end connected to the drive rod that transmits a driving force from the electromagnetic operating device, the other end connected to the insulating rod, and is rotatably supported by the shaft.
The connection between the lever and the insulating rod is such that the connecting portion is sandwiched between a locking nut and a nut screwed into the insulating rod, and the locking nut holds the above-mentioned on the insulating rod. An electromagnetically operated switchgear characterized in that a connecting position between a lever and the insulating rod is adjusted. The electromagnetically operated switchgear according to claim 1,
The lever and the insulating rod are connected by connecting the lever to a square connecting jig having a through hole in the axial direction via a pin and inserting the insulating rod into the through hole of the connecting jig. And a nut through a spring washer and the locking nut that is screwed to the insulating rod are connected by sandwiching the connecting jig. An electromagnetically operated switchgear characterized in that its position is adjusted. The electromagnetically operated switchgear according to claim 1,
The connection between the lever and the insulating rod is such that the lever is formed in an L-shaped section having a through hole in the axial direction, the insulating rod is inserted into the through hole of the lever, and the insulating rod A locking nut and a nut through a spring washer are connected by sandwiching the lever, and the connection position of the lever and the insulating rod is adjusted by the locking nut. An electromagnetically operated switchgear. The electromagnetically operated switchgear according to claim 1,
The lever and the insulating rod are connected by connecting the lever to a square connecting jig having a through hole in the axial direction via a pin and inserting the insulating rod into the through hole of the connecting jig. And the two locking nuts screwed to the insulating rod are connected by sandwiching the connecting jig, and the position of the connecting jig is adjusted by the locking nut. An electromagnetically operated switchgear characterized by the above. The electromagnetically operated switchgear according to any one of claims 1 to 4,
The electromagnetically operated switchgear characterized in that the locking nut is a double nut comprising an eccentric nut with a wedge and a nut with a keyway. The electromagnetically operated switchgear according to claim 5,
The double nut consisting of the eccentric nut with a wedge and the nut with a keyway has an eccentric nut with a wedge that has been offset by shifting the center of the nut and a concave recess with a taper on the other nut. An electromagnetically operated switchgear characterized by comprising a keyed nut.

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