JP6180573B1 - Load tap changer - Google Patents

Abstract

An on-load tap switching device is provided that can prevent a situation in which an output torque of an energy storage drive mechanism that operates a switch that opens and closes during tap switching is insufficient. A load for transmitting a driving force from the crank plate to a switch by converting a displacement of a slider that is urged by a spring provided in an accumulator mechanism into a rotary motion. In the hour tap switching device, a plurality of drive rollers r1 to r5 are attached to the slider 5, and a roller contact surface having roller contact areas Sc1 to Sc8 with which any of the plurality of drive rollers contacts in the process of displacement of the slider is provided. By providing a driven part on the crank plate 20 side and replacing the driving roller in contact with the roller contact surface of the driven part in the course of displacement of the slider, the magnitude of the operating torque obtained at each rotational angle position of the crank plate can be increased. It can be set appropriately. [Selection] Figure 1

Description

  The present invention relates to a load tap changer installed in a power system.

  In order to adjust the voltage of each part, a load-time tap switching device is installed in the power system. The load tap changer switches the tap provided on the transformer uninterruptibly when the system voltage goes out of the allowable range, and operates to keep the system voltage within the allowable range. It has been known.

  As shown in Japanese Patent Application Laid-Open No. 2003-228688, the tap selector is a tap selector that alternately selects even and odd taps of a transformer and a tap that allows load current to flow. A switch that performs switching operation from the previously selected tap to the newly selected tap and a type that performs tap switching, an operation that sequentially selects a series of taps of the transformer, and a load current A selection switch that performs both the operation of switching the tap to be flowed from the previously selected tap to the newly selected tap is provided, and a tap that is switched by the operation of the selection switch is used. Yes.

  As described above, in the on-load tap switching device, various types of switches are used as opening / closing operations at the time of tap switching. These switches operate as quickly as possible (fast motion). Therefore, when a mechanical switch is used, it is essential to provide an operation mechanism for moving the switch at high speed.

  As an operation mechanism for rapidly moving the switch of the tap switching device, an energy storage drive mechanism that operates the switch by using the force generated when the force stored in the spring is released is often used. . The accumulator drive mechanism is driven by an accumulator mechanism that accumulates a spring using an electric motor or the like as a drive source, and an urging force of the spring that is generated when the accumulated spring is released, in one direction along one plane and A slider that is linearly displaced in the other direction, a crank plate that can be rotated about a rotation center axis orthogonal to the plane, and a linear displacement of the slider is converted into a rotational displacement and transmitted to the crank plate. A displacement transmission mechanism, and the switch is operated using the torque output from the rotating crank plate when the stored spring is released and the slider is displaced as the operating torque.

  As this type of energy storage drive mechanism, those shown in Patent Document 2 and Patent Document 3 are known. 8 to 10 schematically show the states of the respective parts in a series of operation processes of the energy storage drive mechanism disclosed in Patent Document 3, as an example. 8 to 10, reference numeral 1 denotes an energy storage drive mechanism, and reference numeral 2 denotes a frame that supports a main part of the energy storage drive mechanism 1. The illustrated accumulator drive mechanism 1 includes a box-shaped first slider 4 and a second slider 5 that are opposed to each other, are slidably supported by a frame 2, and are slid along a single plane. Displacement of the first slider 4 is arranged inside the second slider 5 in a state along the plane and arranged in a direction perpendicular to the sliding direction of the first and second sliders 4 and 5. And a pair of springs 6 and 6 (only one spring 6 is shown in FIGS. 8 to 10) and the first and second sliders with the frame 2 in between. A hollow rotary drive shaft 7 disposed on the opposite side, a long hole (not shown) provided in the first slider 4, and a long hole (not shown) provided in the second slider 5. A state in which the window portion provided in the frame 2 and the hollow portion of the rotary drive shaft 7 are penetrated. , The cam shaft 10 that converts the rotation of the operation shaft 8 into a reciprocating linear displacement and transmits it to the first slider 4, and the second that is to be displaced by the biasing force of the spring 6. A latch mechanism 11 that latches the slider 5 and a displacement transmission mechanism 12 that converts the slide displacement of the second slider 5 into a rotational displacement and transmits the rotational displacement to the rotational drive shaft 7 are provided. The operation shaft 8 is rotationally driven by an electric operating device (not shown) via an insulated drive shaft 9 (see FIG. 8C).

  The first slider 4 is arranged in parallel with each other and is framed through a pair of guide rods 14a and 14b slidably penetrating the side wall portion on one end side and the side wall portion on the other end side of the first slider 4. 2 is supported. The second slider 5 is arranged in parallel with each other inside the guide rods 14a and 14b, and is slidably passed through the side wall portion on one end side and the side wall portion on the other end side of the second slider 5. It is supported by the frame 2 via guide bars 15a and 15b.

  A pair of springs 6 and 6 arranged inside the second slider 5 spiral around the pair of guide rods 14a and 14b for guiding the first slider 4 along the axial direction of both guide rods. One end and the other end of each spring are provided so as to extend, and one end and the other end of a pair of spring receiving members (not shown) that are slidably fitted to the guide rods 14a and 14b. 2 is in contact with the inner surface of the side wall portion on one end side of the slider 5 and the inner surface of the side wall portion on the other end side of the second slider 5. Although not shown, one and the other of the pair of spring receiving members are pressed against the portions where the guide rods 14a and 14b of the side wall portion on one end side and the side wall portion on the other end side of the first slider 4 penetrate, respectively. A pair of spring drive portions is formed, and a power storage mechanism that stores and compresses the springs 6 and 6 in the process of sliding displacement of the first slider 4 by the spring drive portions and the spring receiving member. Is configured. The illustrated accumulator drive mechanism 1 is described in Patent Document 3 and the like and is already known, and thus detailed description of the configuration of the spring receiving member and the configuration of the spring drive unit and the like is omitted.

  As shown in FIG. 8A, the cam mechanism 10 is arranged in parallel with the longitudinal direction thereof oriented in a direction perpendicular to the longitudinal direction of the guide rods 14a, 14b, 15a, 15b. A pair of square columnar guides 16 and 16 fixed to the ceiling plate of one slider 4 and an eccentric disc 17 fixed to the operation shaft 8 with the center of rotation located at a position eccentric to the center. It is made up of. The eccentric disc 17 is disposed between the guides 16 and 16 with its outer peripheral surface being in contact with the opposing surfaces of the guides 16 and 16. The cam mechanism 10 displaces the first slider 4 by a fixed distance in one direction along the longitudinal direction of the guide rods 14a and 14b while the eccentric disk 17 rotates 180 degrees in one direction. While further rotating 180 degrees in one direction, the first slider 4 is linearly displaced by a certain distance in the other direction along the longitudinal direction of the guide rods 14a and 14b.

  The displacement transmission mechanism 12 is at a position eccentric to the operation shaft 8, a crank plate 20 (see FIG. 8C) fixed to the rotary drive shaft 7, a drive plate 21 fixed to the bottom surface of the second slider 5. One end and the other end are coupled to the drive plate 21 and the crank plate 20, respectively, and are composed of pins 22 connecting the drive plate 21 and the crank plate 20. The pin 22 is rotatably provided with respect to the drive plate 21 and the crank plate 20, and the drive plate 21 is slid to one side along the longitudinal direction of the guide rods 15a and 15b together with the second slider 5. When it is slid and displaced to the other side, the crank plate 20 is rotated together with the rotary drive shaft 7 by a certain angle in one direction and the other direction.

  The illustrated latch mechanism 11 is arranged at a corner portion on a support plate 32 (see FIGS. 8B and 8C) which is arranged with a gap in the sliding direction of the first and second sliders 4 and 5 and fixed to the frame 2. And a pair of latch levers 25 and 26 supported rotatably via pins 23 and 24, and recesses 20a and 20b formed on the outer periphery of the crank plate 20 in order to engage the tips of the latch levers 25 and 26. And a return spring 29 that urges the rear end portions of the latch levers 25 and 26 toward each other, and a latch release member 30 that is provided integrally with the first slider 4.

  The latch release member 30 is formed of, for example, a claw provided integrally with the first slider 4, and the set position (spring accumulation is completed) in the process in which the first slider 4 is displaced in one direction and the other direction. The latch levers 25 and 26 are engaged with the release member engaging portions 25a and 26a provided on the latch levers 25 and 26, respectively. By rotating it against the urging force of 29, the front ends of the latch levers 25 and 26 are removed from the recesses 20a and 20b so that the latch of the second slider 5 is released. In FIGS. 8A, 8C, 9A, 9C, 10A, and 10C, the latch levers 25 and 26 and the return spring 29 are not shown.

  The operation shaft 8 penetrating the rotation drive shaft 7 is coupled to an operation portion of a tap selection device (not shown) via a gear mechanism or the like, and tap selection operation by an odd-number tap selector and even-number tap according to the rotation. The tap selection operation by the selector is alternately performed. The rotation drive shaft 7 applies a rotational force to a switch (not shown) to cause the switch to open and close in a predetermined sequence.

  The accumulator drive mechanism 1 shown in FIGS. 8 to 10 operates as follows. If the operation shaft 8 is rotated in the clockwise direction in FIGS. 8 to 10A, the eccentric disk rotates in the clockwise direction in accordance with the rotation of the operation shaft 8, and the first slider 4 is moved in the drawing. Slide displacement to the right. The spring 6 is compressed along with the sliding displacement of the first slider 4. At this time, the second slider 5 is urged by the spring 6 to try to displace it in the right direction in the drawing and to rotate the crank plate 20 counterclockwise. However, as shown in FIG. Since the rotation of the crank plate 20 in the counterclockwise direction is prevented by the engagement between the lever 25 and the recess 20a of the crank plate 20, the second is connected to the crank plate 20 via the drive plate 21 and the pin 22. The displacement of the second slider 5 is also prevented (the second slider 5 is latched). At this time, since the second slider 5 holds the stopped state, the spring 6 is stored with the displacement of the first slider 4. FIG. 9 shows a state in which the spring 6 is being stored (a state where the eccentric disk is rotated about 90 degrees from the state of FIG. 8).

  When the first slider 4 is displaced rightward in the drawing and reaches a set position set immediately before the displacement reaches the maximum value, the latch release provided on the first slider 4 is released. The member 30 pushes the release member engaging portion 25a of the latch lever 25 to remove the tip of the latch lever 25 from the recess 20a. Thereby, since the latch of the second slider 5 is released, the second slider 5 is quickly slid (linearly displaced) in the right direction in the drawing by the biasing force of the spring 6. The slide displacement of the second slider 5 is converted into a rotational displacement by the displacement transmission mechanism 12 and transmitted to the crank plate 20 fixed to the rotary drive shaft 7, so that the crank plate 20 together with the rotary drive shaft 7 is shown in FIG. In (B), it is rotated counterclockwise. By the rotation of the rotary drive shaft 7, for example, a series of opening / closing operations of the switch when switching the tap from the odd-numbered tap to the even-numbered tap is performed. When the crank plate 20 is rotated to the limit position shown in FIG. 10, the tip of the latch lever 26 is engaged with the recess 20b provided in the clamp plate 20, and the crank plate 20 is rotated clockwise in the drawing. This prevents the second slider 5 from being displaced in the left direction in the drawing.

  When the operation shaft 8 is further rotated 180 degrees, the first slider 4 is slid in the left direction in the drawing. In the course of the slide displacement of the first slider 4, the spring 6 is stored again. When the first slider 4 reaches the set position in the process of sliding to the left, the latch release member 30 engages with the release member engaging portion 26a of the latch lever 26, and the tip of the latch lever 26 is moved to the crank plate 20. Therefore, the second slider 5 is quickly slid leftward in the drawing by the biasing force of the spring 6. Due to the sliding displacement of the second slider 5, the crank plate 20 is rotated in the clockwise direction together with the rotary drive shaft 7. By the rotation of the rotary drive shaft 7, a series of operations of the switch when the tap is switched from the even tap to the odd tap is performed.

  In Patent Document 4, a displacement transmission mechanism that converts the linear displacement of the second slider 5 into a rotational displacement and transmits the rotational displacement to the crank plate 20 is stored in a configuration different from that shown in FIGS. A force drive mechanism is disclosed. The accumulator drive mechanism disclosed in Patent Document 4 is a discharge slider corresponding to the second slider 5 and a flywheel (corresponding to the crank plate 20) coupled to the drive shaft corresponding to the rotary drive shaft 7. ), A Y-shaped guide slot provided on the flywheel, and a bracket fixed to the release slider, which is rotatably supported so that the release slider is linearly displaced and fitted into the guide slot. And a roller to be moved.

  In the accumulator drive mechanism disclosed in Patent Document 4, the guide slot and the roller constitute a displacement transmission mechanism that converts the linear displacement of the discharge slider into a rotational displacement and transmits it to the flywheel. The roller has a diameter corresponding to the width of the guide slot, and displaces the roller together with the discharge slider while being guided by the guide slot while the discharge slider is linearly displaced by the biasing force of the spring. Thus, the flywheel and the drive shaft are rotated to cause the tap changer to perform a series of operations.

JP 2004-319975 A JP-A-11-54342 JP 2013-77731 A Japanese Patent No. 4669901

  As described above, the accumulator drive mechanism 1 used in the conventional on-load tap changer shown in FIGS. 8 to 10 is a process in which the second slider 5 is linearly displaced by the urging force of the spring 6. Then, the drive plate 21 attached to the second slider 5 pushes the single pin 22 fixed to the crank plate 20 at a position spaced apart from the operation shaft 8, whereby the crank plate 20 Is configured to rotate together with the rotary drive shaft 7.

  In this case, the output torque of the accumulator drive mechanism 1 (torque output from the crank plate 20 via the rotary drive shaft 7) is the force applied from the spring 6 to the pin 22 via the slider 5 and the pin 22 is operated. It is determined by the product of the component in the direction perpendicular to the straight line connecting the center of the shaft 8 and the distance between the pin 22 and the operating shaft 8. The driving force applied to the pin 22 from the spring 6 via the slider 5 once increases immediately after opening the spring and then tends to attenuate as the spring expands. When the distance between them is constant, the characteristic of the output torque τ of the accumulator drive mechanism 1 with respect to the rotation angle θ of the rotary drive shaft is that of the rotary drive shaft 7 as shown by the curve a in FIG. The rotation angle range gradually decreases from the middle to the end.

  Therefore, in the conventional on-load tap switching device configured to receive the driving force of the spring 6 by the single pin 22 over the entire range of the rotation angle range of the crank plate 20, FIG. As indicated by the curve b, when the load torque applied to the crank plate 20 from the switch side increases at the end of the switching operation, the accumulating drive mechanism 1 generates a torque of a magnitude necessary for causing the switch to move at high speed. May not be able to be output, and there is a risk that normal switching operation cannot be performed.

  A flywheel (crank plate) that rotates a roller attached to a bracket fixed to a release slider (second slider) together with a rotary drive shaft as in the energy storage drive mechanism disclosed in Patent Document 4. In the case where the displacement of the slider is transmitted to the rotary drive shaft by being fitted in the guide slot provided in the guide slot and displaced together with the release slider while guiding the roller by the guide slot, Depending on the shape, the output torque of the energy storage drive mechanism can be adjusted to some extent. However, in the energy storage drive mechanism shown in Patent Document 4, there is a limit to increasing the curvature of the guide slot in order to smoothly displace the roller along the guide slot. It is difficult to cope with the case where the operating torque required by the switch shows a sudden change as in b.

  Further, in the energy storage drive mechanism disclosed in Patent Document 4, one roller contacts the guide surface of the same guide slot for a long time in the process of causing the switch of the on-load tap switching device to perform a series of operations. As a result, the wear of the guide surface of the guide slot progresses early and the life of the energy storage drive mechanism may be shortened.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an on-load tap switching device in which a mechanical switch that opens and closes when a tap is switched is operated by an accumulator drive mechanism. An object of the present invention is to prevent the output torque of the energy storage drive mechanism from being insufficient and the life of the energy storage drive mechanism from being shortened.

In the present specification, at least the following first to seventh inventions are disclosed in order to achieve the above object.
(1) First invention The first invention disclosed in the present application is a switch that performs an opening / closing operation when switching taps of a transformer, and a storage that outputs an operation torque necessary for operating the switch. The present invention is directed to an on-load tap switching device including a force drive mechanism. In the on-load tap switching device targeted by the present invention, the energy storage drive mechanism includes an energy storage mechanism for storing a spring, a slider driven by the spring and linearly displaced along a plane, A crank plate arranged so as to face the slider and extending in a direction perpendicular to the plane and rotating as a rotation center axis, and linear displacement of the slider is converted into rotational displacement and transmitted to the crank plate And a displacement transmission mechanism for outputting an operation torque from the crank plate.

  In the present invention, the displacement transmission mechanism includes a plurality of driving rollers disposed in a space between the slider and the crank plate and supported by the slider, and a plurality of driving rollers in the course of linear displacement of the slider. At least one driven portion fixed to the crank plate with a roller contact surface that contacts any one of the side surfaces facing the space, and any of the driving rollers in the process of linear displacement of the slider The crank plate is rotated by pressing the driven part in the displacement direction of the slider in contact with only the roller contact surface existing on the front side in the displacement direction of the slider. In the present invention, the drive roller that pushes the driven portion is replaced every time the crank plate rotates by a set angle in the process of linear displacement of the slider, and the switch is operated at each rotation angle position of the crank plate. In order to obtain the required operating torque, the positional relationship between the driving rollers, the positional relationship between the driving rollers and the roller contact surface, the profile of the roller contact surface, each part of the roller contact surface, and the crank The distance from the center of rotation of the plate is set.

  In the above configuration, "a crank plate is formed by pressing any driven part in the slider displacement direction while either driving roller is in contact with only the roller contact surface existing on the front side of the slider displacement direction during the linear displacement of the slider." The purpose of “rotating the shaft” is to eliminate the configuration in which the crank plate is rotated by displacing the drive roller while being guided by the guide slot provided on the crank plate side. That is, in the present invention, a slot (groove) in which each drive roller is fitted and restrained is not formed in a region through which each drive roller passes in the process of linear displacement of each drive roller together with the slider. In addition, a driven part is provided.

  In the above configuration, the “operating torque necessary for operating the switch at each rotation angle position of the crank plate” is preferably more than the load applied to the crank plate from the switch side. The operation torque necessary for operating the switch at the rotational angle position does not always have to be greater than the load torque applied to the crank plate from the switch side. When the rotation speed of the crank plate becomes sufficiently high during the operation of the switch and the inertia of the rotating system including the crank plate is sufficiently exerted, the operation torque (accumulation drive) output from the slider through the crank plate Even if the output torque of the mechanism is slightly lower than the load torque, the switch can be operated without any trouble.

  When configured as described above, by adjusting the positional relationship between the plurality of drive rollers, the positional relationship between the plurality of drive rollers and the roller contact surface, and the profile of the roller contact surface, The operating torque output by the accumulator drive mechanism at the rotation angle position can be adjusted as appropriate, preventing the situation where the output torque of the accumulator drive mechanism is insufficient during the tap switching process. The switching operation of the switching device can be performed without hindrance.

  In addition, as described above, when the crank roller is rotated at a set angle in the course of linear displacement of the slider, the drive roller that pushes the driven part is replaced. Since the time for each drive roller to contact the roller contact surface can be shortened in the process of performing this operation, the burden on each part of the drive roller and the roller contact surface is reduced and the life of the energy storage drive mechanism is extended. Can be planned.

(2) Second invention A second invention disclosed in the present application is applied to the first invention. In the present invention, a plurality of unit sections arranged in the displacement direction of the slider are arranged in the displacement section of the slider. In addition, a roller contact area corresponding to each of the plurality of unit sections is set on the roller contact surface, and a predetermined drive roller among the plurality of drive rollers is set while each slider is displaced in each unit section. It is comprised so that the roller contact area | region corresponding to a unit area may be contacted.

  With this configuration, the driving roller that pushes the driven portion each time the crank plate rotates by a set angle during the linear displacement of the slider can be replaced in a predetermined order, and the roller contact surface profile and the roller By appropriately setting the correspondence between the distance between each part of the contact surface and the rotation center of the crank plate, the roller contact area set on the roller contact surface and the unit section set on the slider displacement section, A desired operation torque can be output at each rotation angle position of the crank plate.

(3) Third invention In the third invention disclosed in the present application, the energy storage drive mechanism is arranged so as to be opposed and supported so as to be slidable in one direction and the other direction along one plane. A first and second sliders, a cam mechanism for transmitting the rotation of the operating shaft to the first slider to reciprocate the first slider in accordance with the rotation of the operating shaft driven by the operating device, A spring provided between the first slider and the second slider that accumulates energy in the process of displacing the first slider in one direction and the other direction and biases the second slider in one direction and the other direction. And a crank plate provided so as to be able to rotate with an axis extending in a direction perpendicular to the plane as a rotation center axis, and a displacement of the second slider caused by the biasing force of the spring is converted into a rotational displacement. Change transmitted to the crank plate A position transmission mechanism and configured to output an operation torque from the crank plate.

  In this case, the displacement transmission mechanism is arranged in a space between the second slider and the crank plate, and makes contact with any of the plurality of driving rollers and the plurality of driving rollers supported by the second slider. Any one of a plurality of driving rollers in a process in which the second slider linearly displaces, having a roller contact surface on a side surface facing the space and fixed to the crank plate. Is configured to rotate the crank plate by touching only the roller contact surface existing on the front side in the displacement direction of the slider and pushing the driven portion in the displacement direction of the second slider. The driving roller that pushes the roller contact surface is switched every time the crank plate rotates by a set angle in the course of the linear displacement of the second slider in each direction, and the switch is operated at each rotation angle position of the crank plate. In order to obtain the necessary operating torque, the positional relationship between the driving rollers, the positional relationship between the driving rollers and the roller contact surface, the profile of the roller contact surface, and each part of the roller contact surface And a distance between the rotation center of the crank plate and the center of rotation.

  When configured as described above, the switch can be operated by rotating the crank plate in one direction and the other direction while the second slider is displaced in one direction and the other direction. When rotating in any direction, the same effect as that obtained by the first invention can be obtained.

(4) Fourth invention The fourth invention is applied to the third invention. In the present invention, the displacement direction of the slider is included in the displacement section when the second slider is linearly displaced in each direction. A plurality of unit sections arranged in a row are set, and a roller contact area corresponding to each of the plurality of unit sections is set on the roller contact surface of the driven part, and a plurality of drivings are performed while the slider is displaced in each unit section. A predetermined driving roller of the rollers is configured to contact a roller contact area corresponding to each unit section.

  In the case of the above configuration, the angular rotation of the crank plate set in the process of linear displacement of the slider in both cases of displacing the second slider in one direction and displacing in the other direction. The driving roller that pushes the driven part each time can be changed in a predetermined order, the profile of the roller contact surface, the distance between each part of the roller contact surface and the rotation center of the crank plate, and the roller contact surface By appropriately setting the correspondence between the roller contact area to be set and the unit section set as the slider displacement section, a desired operation torque can be output at each rotational angle position of the crank plate.

(5) Fifth Invention The fifth invention is applied to the third invention or the fourth invention. In the present invention, linear displacement in each direction of the second slider is converted into rotational displacement. Three or more driving rollers are provided to transmit to the crank plate, and the linear displacement in one direction of the second slider and the linear displacement in the other direction are converted into rotational displacements and transmitted to the crank plate. All the driving rollers to be used are arranged symmetrically with respect to a reference plane perpendicular to the displacement direction of the second slider at a position where the second slider is divided into two in the displacement direction.

  With this configuration, the characteristics of the operating torque with respect to the rotation angle of the crank plate can be made the same regardless of whether the second slider is displaced in one direction or in the other direction. it can. Further, in both cases of displacing the second slider in one direction and displacing in the other direction, three or more driving rollers sequentially contact a predetermined region of the roller contact surface of the driven part, Since the displacement of the second slider is converted into a rotational displacement, the time for each driving roller to contact the roller contact surface in the process of causing the switch to perform a series of operations for tap switching can be shortened. And the burden concerning each part of a roller contact surface can be reduced, and the lifetime of an energy storage drive mechanism can be extended.

(6) Sixth Invention The sixth invention is applied to the third invention or the fourth invention. In the present invention, linear displacement in one direction of the second slider is converted into rotational displacement. A total of five drive rollers are provided as drive rollers used to transmit to the crank plate and the second slider to convert the linear displacement in the other direction into the rotational displacement and transmit it to the crank plate. One of the five driving rollers is one of the driving rollers used to convert the linear displacement of the second slider in one direction into a rotational displacement and transmit it to the crank plate. The displacement transmission mechanism is configured to function as a common roller that also serves as one of the driving rollers used to convert the linear displacement of the second slider in the other direction into rotational displacement and transmit it to the crank plate. In this case, the five drive rollers are in a state where the central axis of the common roller is positioned on a reference plane orthogonal to the displacement direction of the second slider at a position that bisects the second slider in the displacement direction. The reference plane is symmetrical with respect to the plane of symmetry.

  As described above, one of the five driving rollers is one of the driving rollers used for converting the linear displacement of the second slider in one direction into the rotational displacement and transmitting it to the crank plate. If the second slider is configured to function as a common roller that also serves as one of the driving rollers used to convert the linear displacement in the other direction into the rotational displacement and transmit it to the crank plate, the number of driving rollers Thus, the displacement transmission mechanism can have a simple configuration.

(7) 7th invention 7th invention showed an example of the preferable structure of the displacement transmission mechanism provided in the energy storage mechanism of the on-load tap switch which concerns on 3rd invention, In this invention, it is a displacement The transmission mechanism has the following configurations [A] to [E].
[A] The plurality of drive rollers include a rotation center axis of the crank plate and are orthogonal to the first reference plane from a first reference plane (P1-P1) that is a plane along the displacement direction of the second slider. The first and second are arranged symmetrically with respect to the second reference plane (P2-P2), which is a plane perpendicular to the first reference plane and located at a position spaced apart by a certain distance in the direction. Drive rollers (r1 and r2), the first and second drive rollers (r1 and r2) and the first reference plane (P1-P1), and the central axis is the second reference plane Between the third drive roller (r3) arranged in a state of being positioned on (P2-P2), and between the first and second drive rollers (r1 and r2) and the third drive roller (r3). A third reference which is a plane extending in parallel with the first reference plane (P1-P1) The central axis is positioned on the plane (P3-P3), and the second reference plane (P2-P2) is a plane of symmetry, which is greater than the distance between the first and second drive rollers (r1 and r2). It consists of fourth and fifth drive rollers (r4 and r5) which are arranged symmetrically with a space therebetween.
[B] The first and second drive rollers (r1 and r2) have a higher first drive roller (r1) than the second drive roller (r2) when the second slider is displaced in one direction. It arrange | positions so that it may be located in the front side of the displacement direction of 2 sliders.
[C] The fourth drive roller (r4) is arranged on the same side as the second drive roller (r2) with respect to the second reference plane (P2-P2), and the fifth drive roller (r5) is It is arranged on the same side as the first drive roller (r1) with respect to the second reference plane (P2-P2).
[D] The first to fourth unit sections arranged in order along the one direction are set in the displacement section when the second slider is displaced in the one direction, and the second slider is displaced in the other direction. Fifth to eighth unit sections arranged in order along the other direction are set in the displacement section when the operation is performed.
[E] The roller contact surface of the driven part is the first roller contact with which the first driving roller (r1) contacts when the second slider is in the first unit section in the process of displacing in the one direction. Region (Sc1) and the second roller contact region where the third drive roller (r3) contacts when the second slider is in the second unit section in the course of displacement of the second slider in the one direction (Sc2) and the third roller contact area (Sc3) where the first drive roller (r1) contacts when the second slider is in the third unit section in the process of the second slider being displaced in one direction. ), And a fourth roller contact area (Sc4) with which the fourth drive roller (r4) contacts when the second slider is in the fourth unit section in the course of displacement of the second slider in one direction. The second slider is in the fifth unit section in the process of displacing in the other direction. When the second slider is in the sixth unit section in the course of the displacement of the second slider in the other direction and the fifth roller contact area (Sc5) where the second drive roller (r2) contacts The sixth roller contact area (Sc6) with which the third drive roller (r3) contacts and the second slider is in the seventh unit section in the process of the second slider being displaced in the other direction. The seventh roller contact area (Sc7) with which the second driving roller (r2) contacts, and the second slider is in the eighth unit section in the process of the second slider being displaced in the other direction. And an eighth roller contact area (Sc8) with which the drive roller (r5) contacts.

  If the displacement transmission mechanism is configured as described above, the operation torque required for the switch is complicated, for example, as shown by the curve c in FIG. It is possible to easily cope with the case where the characteristic is shown.

  According to the present invention, the torque output by the energy storage drive mechanism at each rotational angle position of the crank plate can be appropriately set, so that the output torque of the energy storage drive mechanism is insufficient during the tap switching process. This can be prevented and the tap switching operation can be performed without any trouble.

  Further, according to the present invention, the driving roller that pushes the driven portion is replaced every time the crank plate rotates by a set angle in the process of linear displacement of the slider. It is possible to shorten the time that each driving roller contacts the roller contact surface in the process of performing the operation, thereby reducing the burden on each part of the driving roller and the roller contact surface, and extending the life of the energy storage drive mechanism. be able to.

FIG. 1 is a front view showing a configuration example of a main part of an energy storage drive mechanism used in an embodiment of the present invention. (A) And (B) is operation | movement explanatory drawing which showed the state of each part in a different operation | movement process of the energy storage drive mechanism shown in FIG. (A) And (B) is operation | movement explanatory drawing which showed the state of each part in the other different operation | movement process of the energy storage drive mechanism shown in FIG. (A) And (B) is operation | movement explanatory drawing which showed the state of each part in the other different operation | movement process of the energy storage drive mechanism shown in FIG. (A) And (B) is operation | movement explanatory drawing which showed the state of each part in the other different operation | movement process of the energy storage drive mechanism shown in FIG. (A) And (B) is operation | movement explanatory drawing which showed the state of each part in the other different operation | movement process of the energy storage drive mechanism shown in FIG. (A) is a graph schematically showing an example of output torque characteristics of the accumulator drive mechanism used in a conventional on-load tap switching device, and an example of load torque characteristics applied to the accumulator drive mechanism; B) is a graph schematically showing an example of output torque characteristics of the energy storage drive mechanism shown in FIG. 1 and an example of characteristics of load torque applied to the energy storage drive mechanism. The state of each part in one operation process of the accumulator drive mechanism used in the conventional on-load tap switching device is shown, (A) is a top view, (B) is a crank plate provided therein The top view of the part of a latch mechanism, (C) is a longitudinal cross-sectional view. FIGS. 9A and 9B show the state of each part in another operation process of the energy storage drive mechanism shown in FIG. 8, wherein FIG. 8A is a top view, and FIG. FIG. 2C is a longitudinal sectional view. FIG. 9 shows the state of each part in yet another operation process of the energy storage drive mechanism shown in FIG. 8, (A) is a top view, and (B) is a part of the crank plate and latch mechanism provided therein. A top view and (C) are longitudinal sectional views.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 6 show that, in the on-load tap changer according to the present embodiment, the linear displacement of the slider is the rotational displacement of each part of the accumulator drive mechanism that operates the switch that opens and closes when the tap is changed. The structure of the part of the displacement transmission mechanism 12 which converts and transmits to a crank board is shown.

  1 to FIG. 6, the same reference numerals as those in FIG. 8 to FIG. 10 are attached to the same parts as those of the conventional energy storage drive mechanism 1 shown in FIG. 8 to FIG. is there. In this embodiment, the displacement transmission mechanism 12 that transmits the linear displacement of the second slider 5 to the rotational displacement and transmits it to the crank plate 20 has a configuration different from that of the conventional example. Other configurations include a point that the shape of the crank plate 20 is changed, a point that the position of the latch mechanism 11 is changed, and a roller in which the latch release member 30 is rotatably supported by the first slider 4. Except for this point, it is the same as the conventional example shown in FIGS. 8 to 10, and is a basic mechanism for moving the second slider 5 to the left and right by driving the operating shaft 8 and accumulating the spring 6. The configuration and operation are the same as in the conventional example. In FIG. 1 to FIG. 6, illustrations of the first slider 4, the spring 6 that biases the second slider 5, the cam mechanism 10 that biases the spring 6, and the like are omitted. In the description, FIGS. 8 to 10 are also referred to as necessary.

  The accumulator drive mechanism 1 used in the present embodiment is arranged so as to be opposed and slidably displaced in one direction and the other direction along one plane, similarly to the accumulator drive mechanism 1 shown in FIGS. The first slider 4 and the second slider 5 supported by the cam mechanism, and a cam mechanism for transmitting the rotation of the operation shaft to the first slider 4 so as to reciprocate the first slider 4 as the operation shaft 8 rotates. 10 and the first slider 4 and the second slider 5 are provided between the first slider 4 and the second slider 5 so that the first slider 4 is displaced in one direction and the other direction, and the second slider 5 is moved in one direction. In order to store the spring 6 until the first slider 4 reaches the set position in the course of the displacement of the first slider 4 in one direction and the other direction, respectively. 2 slider 5 is latched and the first slider 4 is set A latch mechanism 11 for releasing the latch of the second slider 5 when the position is reached, and the second slider 5 so as to be opposed to the second slider 5, along the displacement direction of the first and second sliders 4 and 5. A crank plate 20 provided so as to be able to rotate with an axis extending in a direction orthogonal to the plane as a rotation center axis, and a rotary drive shaft 7 provided so as to rotate together with the crank plate 20 and applying a rotational force to the switch; A displacement transmission mechanism that converts the linear displacement of the second slider 5 into a rotational displacement and transmits it to the crank plate 20 is configured to output an operation torque from the crank plate 20 through the rotary drive shaft 7. . In the illustrated example, the crank plate 20 is provided in a state of sharing the operation shaft 8 and the rotation center axis. The crank plate 20 and the rotation drive shaft 7 are provided with holes that share the axis with the rotation center axis, and an operation shaft 8 that drives the tap selector in a state that these holes pass through the holes freely. It has been.

  The latch mechanism 11 is arranged with a gap in the sliding direction of the first and second sliders 4 and 5, and a corner portion is rotated via pins 23 and 24 on a support plate fixed to a frame (not shown). A pair of L-shaped latch levers 25 and 26 supported movably, recesses 20a and 20b formed on the outer periphery of the crank plate 20 to engage the tips of the latch levers 25 and 26, a latch lever 25, 26, and a latch release member 30 fixed to the first slider 4. The latch release member 30 is moved when the first slider 4 is displaced in one direction and the other direction to the set position (position where the spring is fully charged) (when the operation shaft is rotated by a set angle). By engaging the latch levers 25 and 26 and rotating the latch levers 25 and 26 against the biasing force of the spring 29, the ends of the latch levers 25 and 26 are removed from the recesses 20a and 20b, and the second. The latch of the slider 5 is released.

  In the present embodiment, the shape of the crank plate 20 is changed from that shown in FIGS. 8 to 10, and is formed so as to exhibit a symmetrical shape with respect to one plane including the axis of the operation shaft 8. Has been. The position of the latch mechanism 11 is also changed. In the example shown in FIGS. 8 to 10, the latch release member 30 is formed of a claw provided on the first slider 4. However, in this embodiment, the latch release member 30 rotates to the first slider 4. It consists of a freely supported roller.

  Also in this embodiment, when the second slider 5 slides from left to right in FIGS. 1 to 6, the displacement transmission that rotates the crank plate 20 in the direction of the arrow shown in FIG. 2A (clockwise in the figure). A mechanism 12 is provided. In the example shown in FIGS. 8 to 10, the crank plate 20 is shown to rotate counterclockwise when the second slider 5 slides from the left to the right in the drawing, whereas FIG. In FIG. 6 to FIG. 6, an arrow is shown so that the crank plate 20 rotates clockwise when the second slider 5 slides from the left to the right in the drawing. This is because the direction of viewing the displacement transmission mechanism is different from that in FIGS. The relationship between the sliding direction of the second slider 5 and the rotation direction of the crank plate 20 is the same in this embodiment and in the examples shown in FIGS.

  The displacement transmission mechanism 12 used in this embodiment includes a plurality of drive rollers r1 to r5 that are disposed in a space between the second slider 5 and the crank plate 20 and are rotatably supported by the second slider 5. Driven portions 40 and 41 are disposed in a space between the second slider 5 and the crank plate 20 and fixed to the crank plate 20 side. On each side surface of the driven parts 40 and 41 facing the space between the second slider 5 and the crank plate 20, any one of the driving rollers r1 to r5 in the process in which the second slider 5 is linearly displaced. Are formed, and the driving rollers r1 to r5 and the driven parts 40 and 41 cooperate to convert the linear displacement of the second slider into the rotational displacement of the crank plate 20.

  In the displacement transmission mechanism 12 used in the present embodiment, any one of the driving rollers r1 to r5 is in the process of linear displacement of the second slider 5 and only the roller contact surface existing on the front side in the displacement direction of the second slider 5. The crank plate 20 is rotated by pushing the driven part 40 or 41 in the direction of displacement of the second slider 5 in contact with the slider.

  More specifically, the first to fifth drive rollers r1 to r5 are arranged on the bottom surface (surface opposite to the first slider) of the second slider 5 in a direction parallel to the rotation center axis of the crank plate 20. It is rotatably attached via a rotating shaft extending in the direction. In the drawing showing the present embodiment, the second slider 5 is shown by a chain line in FIG. 1, but the second slider 5 is not shown in FIGS.

  In the illustrated example, the driven portions 40 and 41 that cooperate with the driving rollers r1 to r5 are arranged in a space between the second slider 5 and the crank plate 20 and are fixed to the crank plate 20. ing. The driven parts 40 and 41 are provided so as not to contact the second slider 5, and the second parts are arranged on the side surfaces of the driven parts 40 and 41 facing the space between the second slider 5 and the crank plate 20. The first to fifth drive rollers r1 to r5 are in contact with each other at a position away from the center of rotation of the crank plate 20 in the process in which the slider 5 (see FIG. 1) linearly moves in the right and left directions in the drawing. First to eighth roller contact regions Sc1 to Sc8 are formed, and the second slider 5 is linearly displaced in each direction (right direction or left direction in the drawing) on the roller contact surface of the driven parts 40 and 41. The driving rollers that contact and transmit the driving force to the crank plate 20 are appropriately switched (the combination of the driving roller that contacts the crank plate 20 and the roller contact surface of the driven portion is appropriate for transmitting the driving force to the crank plate 20). Switch to And the distance between the contact point between the driving roller that applies driving force to the crank plate 20 and the roller contact surface of the driven portion and the rotation center axis O of the crank plate 20 is The positional relationship between the plurality of driving rollers r1 to r5 and the positional relationship between the plurality of driving rollers r1 to r5 and the roller contact surfaces Sc1 to Sc8 of the driven parts 40 and 41 so as to change with rotation. And the profiles of the roller contact surfaces Sc1 to Sc8.

  The illustrated driven portion 40 includes an axis of the operation shaft 8 and is formed to have a V-shape that is symmetrical with respect to a plane that bisects the crank plate 20 in the circumferential direction. It is fixed in the center. The other driven portion 41 is formed to have a triangular prism shape, and the apex of the triangle is the opening of the V-shaped driven portion 40 at the center in the circumferential direction of the outer peripheral portion of the crank plate 20. It is fixed to the side.

  The plurality of driving rollers attached to the bottom surface of the second slider 5 include first and second driving rollers r1 and r2, a third driving roller r3, and fourth and fifth driving rollers r4 and r5. It is made up of.

  Among the drive rollers, the first and second drive rollers r1 and r2 include a first reference plane P1- that includes the rotation center axis of the crank plate 20 and is a plane along the displacement direction of the second slider 5. A fixed position (example shown in the figure) that is located at a position spaced apart from P1 by a certain distance in a direction perpendicular to the first reference plane (in a direction away from the operation axis 8) and set on the second slider 5 Then, the second reference plane P2-P2, which is a plane orthogonal to the first reference plane P1-P1, is positioned at the position where the second slider 5 is divided into two equal parts in the displacement direction). They are arranged in plane symmetry with a narrow interval to prevent.

  The third driving roller r3 is positioned between the first and second driving rollers r1 and r2 and the first reference plane P1-P1, and the central axis is on the second reference plane P2-P2. It is arranged in a state where it is positioned.

  The fourth and fifth drive rollers r4 and r5 are planes extending between the first and second drive rollers r1 and r2 and the third drive roller r3 in parallel with the first reference plane P1-P1. The center axis line is positioned on three reference planes P3-P3 (see FIG. 1), and the second reference plane P2-P2 is set as a symmetry plane. The distance between the first and second drive rollers r1 and r2 Are arranged symmetrically with a sufficiently large space between them.

  Among these drive rollers, the first and second drive rollers r1 and r2 are such that the first drive roller r1 is second than the second drive roller r2 when the second slider 5 is displaced in one direction. The slider 5 is disposed so as to be positioned on the front side in the displacement direction. The fourth drive roller r4 is arranged on the same side as the second drive roller r2 with respect to the second reference plane P2-P2, and the fifth drive roller r5 is placed on the second reference plane P2-P2. In contrast, it is arranged on the same side as the first drive roller r1.

  In the present embodiment, the first to fourth unit sections arranged in order along the one direction are set in the displacement section when the second slider 5 is displaced in one direction (right direction in the drawing). The fifth to eighth unit sections arranged in order along the other direction are set in the displacement section when the slider 5 is displaced in the other direction (left direction in the drawing).

  In FIG. 1, the second reference plane P2-P2 happens to include the rotation center axis of the crank plate 20, but the second reference plane P2-P2 is placed on the second slider 5. Since this is a plane orthogonal to the first reference plane P1-P1 at the set fixed position (in this embodiment, the position where the second slider 5 is divided into two in the displacement direction), the second reference plane P2-P2 Is displaced together with the second slider 5 along with the linear displacement of the second slider 5.

  In FIG. 1, the fourth driving roller r4 and the fifth driving roller r5 seem to be fitted in the recesses 20a and 20b formed on the outer periphery of the crank plate 20, respectively. The driving roller r4 and the fifth driving roller r5 are provided so as not to directly contact the crank plate 20 (at a position in front of the crank plate 20 in FIG. 1). The fifth drive roller r5 does not fit into the recesses 20a and 20b.

  In the illustrated example, the roller contact surface provided on the side surface of the driven parts 40 and 41 provided on the crank plate 20 is the first unit in the process in which the second slider 5 is displaced in one direction (right direction). A first roller contact area Sc1 that the first drive roller r1 contacts when in the section and a third drive roller when in the second unit section in the process of the second slider 5 being displaced in one direction The second roller contact area Sc2 in contact with r3 and the third roller contact area in which the first drive roller r1 contacts when the second slider 5 is in the third unit section in the process of displacement in one direction. Sc3, the fourth roller contact region Sc4 that the fourth drive roller r4 contacts when the second slider 5 is in the fourth unit section in the process of the second slider 5 being displaced in one direction, and the second slider 5 In the fifth unit section in the process of displacement in the direction (left direction) When the second slider 5 is in the sixth unit section in the process of displacing the second slider 5 in the other direction and the fifth roller contact area Sc5 with which the second drive roller r2 contacts A sixth roller contact region Sc6 with which the third drive roller r3 contacts, and a second drive roller when the second slider 5 is in the seventh unit section in the process of the second slider 5 being displaced in the other direction. The seventh driving roller r5 comes into contact with the seventh roller contact area Sc7 in contact with r2 and when the second slider 5 is in the eighth unit section in the process in which the second slider 5 is displaced in the other direction. It consists of an eighth roller contact area Sc8. In the illustrated example, the third roller contact region Sc3 and the seventh roller contact region Sc7 are formed on the side surface of the driven portion 41 having a triangular prism shape, and the other roller contact surfaces Sc1, Sc2, Sc4, Sc5, Sc6 and Sc8. Is formed on the side surface of the V-shaped driven part 40.

The operation of the energy storage drive mechanism 1 used in the present embodiment will be described with reference to FIGS. 2 to 6 and FIG. 7 (B).
2 to 6 show the operation of the latch mechanism and the displacement transmission mechanism in the process in which the second slider 5 (not shown in FIGS. 2 to 6) is linearly displaced from left to right on the drawing. It is. In these drawings, among the driving rollers r1 to r5, the driving roller that is in contact with any roller contact surface of the driven portion and transmits the driving force to the crank plate 20 is shown in black.

  FIG. 7B shows the torque characteristics required by the switch operated by the energy storage drive mechanism 1 according to this embodiment, and the second slider 5 of the energy storage drive mechanism 1 according to this embodiment. 4 schematically shows the characteristics of the operating torque output from the crank plate 20 through the rotary drive shaft 7 in the process of displacement in the right direction with respect to the rotation angle θ of the crank plate 20. In FIG. 7 (B), the curve b shows the characteristic of the load torque applied to the crank plate 20 from the switch side at each rotational angle position of the crank plate 20, and the curve c shows the energy storage drive mechanism 1 according to the present embodiment. Indicates the characteristics of the operating torque output at each rotational angle position of the crank plate 20.

  FIG. 2A shows a state before the second slider 5 is urged by a spring. In this state, the latch lever 25 is engaged with the recess 20 a formed on the outer periphery of the crank plate 20, and the latch release member 30 is engaged with the latch lever 26. The rotation angle position of the crank plate 20 at this time (the rotation angle position of the rotary drive shaft 7) is defined as θ1. In this state, the fifth driving roller r5 is in contact with the eighth roller contact area Sc8 of the driven portion 40 and holds the crank plate 20 in a stationary state.

  From the state of FIG. 2A, the operating shaft 8 is driven by an electric actuator, and the cam mechanism 10 similar to the cam mechanism 10 used in the energy storage driving mechanism 1 shown in FIGS. When the first slider 4 (not shown in FIGS. 2 to 6) is displaced to the right and the spring 6 is urged, the second slider 5 is urged to the right. One drive roller r1 contacts the first roller contact area Sc1 on the roller contact surface, but the crank plate 20 is latched by the latch lever 25 and cannot rotate.

  When the first slider 4 is displaced to a position where the accumulation of the spring 6 is completed, the latch release member 30 reaches a position where it comes into contact with the latch lever 25 as shown in FIG. The rotational angle position of the crank plate 20 at this time is θ2. The rotation angle position θ2 is substantially the same as the rotation angle position θ1. When the first slider 4 is further displaced after the state shown in FIG. 2B is reached, the latch release member 30 rotates the latch lever 25 to release the latch of the crank plate 20. The displacement of the slider 5 is started. FIG. 3A shows a state immediately after the latch is released and the second slider 5 starts to be displaced. The rotation angle position of the crank plate 20 at this time (same as the rotation angle position of the rotary drive shaft 7 that applies a rotational force to the switch) is defined as θ3.

  In the state of FIG. 3A, the second slider 5 is in the first unit section set at the beginning of the displacement section when it is displaced in the right direction. When the second slider 5 is displaced in the first unit section, the first driving roller r1 comes into contact with the first roller contact area Sc1 formed at the tip of the driven portion 40, and the crank plate 20 The driving force is transmitted to Since the distance between the contact point between each first roller r1 and the first roller contact area Sc1 and the rotation center O of the crank plate 20 is relatively large, the crank plate 20 outputs a relatively large torque.

  When the second slider 5 is displaced to the end point of the first unit section, as shown in FIG. 3B, the third drive roller r3 is positioned closer to the center of rotation of the crank plate 20 than the first roller contact area Sc1. It is in contact with the second roller contact area Sc2 formed at a close position. The rotational angle position of the crank plate 20 at this time is θ4. In the process in which the crank plate 20 is displaced from θ3 to θ4, the distance between the contact between the first roller r1 and the first roller contact region Sc1 and the rotation center O of the crank plate 20 is the rotation of the crank plate 20. Accordingly, the torque that is output from the crank plate 20 (the output torque of the energy storage drive mechanism 1) is reduced with the rotation of the crank plate 20 as shown by the curve c in FIG. 7B. Gradually getting smaller.

  The second slider 5 enters the second unit section after rotating the crank plate 20 to the rotational angle position θ4 shown in FIG. FIG. 4A shows a state immediately after the second slider 5 enters the second unit section. The rotational angle position of the crank plate 20 at this time is θ5. When the second slider 5 enters the second unit section, as shown in FIG. 4A, the second driving roller r3 is formed closer to the center axis than the tip of the driven part 40. The state is switched to the state in which the crank plate 20 is driven in contact with the roller contact area Sc2. In the process in which the second slider 5 is displaced in the second unit section (the process in which the crank plate 20 is rotated from θ5 to θ6), the third roller r3 is moved as shown in FIGS. The driving force is transmitted to the crank plate 20 while maintaining the state in contact with the second roller contact area Sc2.

  The distance between the contact point between the third roller r3 and the second roller contact region Sc2 and the rotation center O of the crank plate 20 is equal to the contact point between the first roller r1 and the first roller contact region Sc1 and the crank. Since the distance between the center of rotation of the plate 20 and the rotation center O is shorter, the transition region (the crank plate 20 rotates from θ4 to θ5) when the second slider 5 moves from the first unit section to the second unit section. In the process), the output torque of the energy storage drive mechanism 1 decreases.

  In the process in which the second slider 5 displaces the second unit section (the process in which the crank plate 20 rotates from θ5 to θ6), the contact between the third roller r3 and the second roller contact area Sc2 and the crank plate 20 The distance from the center of rotation O increases as the crank plate 20 rotates. During this time, the distance between the third roller r3 and the second roller contact area Sc2 is accumulated in the spring. As the energy released is released (the spring is extended) and the urging force of the spring is attenuated accordingly, the output torque of the accumulator drive mechanism is slightly as shown by the curve c in FIG. Decreases gradually. As a result, the output torque of the accumulator drive mechanism is slightly lower than the load torque indicated by the curve b. At this time, the rotational speed of the crank plate 20 is still sufficiently high. The load can be driven without any trouble.

  When the crank plate 20 rotates to the position θ6 shown in FIG. 4B, the first drive roller r1 comes into contact with the third roller contact area Sc3 provided in the driven portion 41, and the second drive roller r1 comes into contact with the second roller contact area Sc3. The slider 5 reaches the end point of the second unit section. FIG. 5A shows a state in which the second slider 5 has been displaced slightly to the right from the end point of the second unit section, and the crank plate 20 has reached the rotational angle position θ7. From this state, the second slider 5 enters the third unit section. In the process in which the second slider 5 is displaced in the third unit section, the driving force is transmitted to the crank plate 20 while the first driving roller r1 is in contact with the third roller contact area Sc3.

  Since the distance between the contact point between the first driving roller r1 and the third roller contact area Sc3 and the rotation center of the crank plate 20 is long, the second slider 5 is moved from the second unit section to the third unit section. In the transitional region (the process in which the crank plate 20 rotates from θ6 to θ7), the output torque of the energy storage drive mechanism 1 increases. While the second slider 5 moves in the third unit section (while the crank plate 20 rotates from θ7 to θ8), the contact between the first drive roller r1 and the third roller contact area Sc3 and the crank plate 20 Although the distance from the rotation center of the spring does not substantially change, the urging force attenuates with the extension of the spring, so that the output torque of the energy storage drive mechanism 1 gradually attenuates.

  When the crank plate 20 rotates to the position θ8 shown in FIG. 5B, the fourth driving roller r4 comes into contact with the fourth roller contact area Sc4 provided in the driven portion 40, and the second driving roller r4 comes into contact with the second roller contact area Sc4. The slider 5 reaches the end point of the third unit section.

  FIG. 6A shows a state in which the second slider 5 has slightly passed the end point of the third unit section and the crank plate 20 has reached the position θ9. From this state, the second slider 5 enters the fourth unit section. In the process in which the second slider 5 is displaced in the fourth unit section, the driving force is transmitted to the crank plate 20 with the fourth driving roller r4 in contact with the fourth roller contact area Sc4. Since the distance between the contact point between the fourth driving roller r4 and the fourth roller contact area Sc4 and the rotation center of the crank plate 20 is short, the second slider 5 is moved from the third unit section to the fourth unit section. In the transition region during the transition to (the process in which the crank plate 20 rotates from θ8 to θ9), the output torque of the energy storage drive mechanism 1 decreases. While the second slider 5 moves in the fourth unit section, the distance between the contact point between the fourth drive roller r4 and the fourth roller contact area Sc4 and the rotation center of the crank plate 20 hardly changes. Since the urging force of the spring attenuates with the extension of the spring, the output torque of the energy storage drive mechanism 1 gradually decreases.

  When the second slider 5 reaches the end point of the fourth unit section and the crank plate 20 reaches the position of θ10 shown in FIG. 6, the latch lever 26 engages with the recess 20b of the crank plate 20 and the second A series of operations when the slider 5 is displaced rightward in FIG.

  When the second slider 5 is displaced in the left direction in FIG. 1, the second slider 5 is displaced from the fifth unit section to the eighth unit section set in order in the displacement direction. Then, the crank plate 20 is rotated counterclockwise in the drawing.

  When the second slider 5 is in the fifth unit section, the second drive roller r2 contacts the fifth roller contact area Sc5 and rotates the crank plate 20, so that the second slider 5 is the sixth unit section. When in the section, the third drive roller r3 contacts the sixth roller contact area Sc6 and rotates the crank plate 20.

  When the second slider 5 reaches the end point of the sixth unit section, the second driving roller r2 comes into contact with the seventh roller contact area Sc7, and the second slider 5 enters the seventh unit section. Then, the crank plate 20 is rotated in a state where the second driving roller r2 is in contact with the seventh roller contact area Sc7. When the second slider 5 reaches the end point of the seventh unit section, the fifth drive roller r5 comes into contact with the eighth roller contact area Sc8, and the second slider 5 enters the eighth unit section. Then, the crank plate 20 is rotated while the fifth drive roller r5 is in contact with the eighth roller contact area Sc8.

  In the above embodiment, the energy storage drive mechanism obtained when the first slider 4 displaces the first unit section to the fourth unit section and when the first slider 4 displaces the fifth unit section to the eighth unit section. The output torque of 1 is appropriately adjusted by appropriately setting the combination of the driving roller and the roller contact surface that transmits the driving force to the crank plate 20 in each region and the profile (shape) of the roller contact surface. can do. Therefore, energy storage drive is performed by appropriately setting the positional relationship between the plurality of driving rollers, the positional relationship between the plurality of driving rollers and the driven portion, and the profile of the roller contact surface of the driven portion. The characteristic of the output torque of the mechanism 1 (curve c in the example shown in FIG. 7B) is approximated to the characteristic of the torque (load torque) required by the switch (curve b in the example shown in FIG. 7B) to open and close It is possible to prevent the torque for driving the switch from being insufficient in the process of causing the switch to perform a series of operations.

  In the above embodiment, five drive rollers are attached to the second slider 5, but the number of drive rollers to be attached to the second slider 5 and the positions where the plurality of drive rollers are provided require a switch. The operating torque can be appropriately changed according to the characteristics of the operating torque. Similarly, the profile of the roller contact surface with which each drive roller is brought into contact can be appropriately changed according to the operation torque required by the switch. Even when the same output torque characteristics are obtained, the number of drive rollers and the profile of the roller contact surface are not limited, and various modifications can be made.

  In the above description, the position between the drive rollers is approximated so as to approximate the characteristic of the torque required in the process of the switching operation of the switch and the characteristic of the output torque (operation torque) of the accumulator drive mechanism 1. The relationship, the positional relationship between the plurality of driving rollers and the driven part, and the profile of the roller contact surface of the driven part are set, but the switch is operated at each rotational angle position of the crank plate 20 Therefore, the output torque characteristic of the accumulator drive mechanism 1 does not necessarily need to be approximated to the characteristic of torque required in the process in which the switch performs the switching operation.

  In the above embodiment, the two driven parts 40 and 41 are provided in order to provide the crank plate 20 with a roller contact surface having a predetermined roller contact area, but the number of driven parts having a roller contact surface is as follows. As long as it is optional and a roller contact surface having a necessary roller contact area can be formed, only one driven part may be provided.

  In order to convert the linear displacement in each direction of the second slider 5 into a rotational displacement and transmit it to the crank plate 20 as in the above embodiment, three drive rollers r1, r3, r4 or r2, r3, If r5 is provided so that the driving roller that pushes the driven part is replaced every time the crank plate 20 rotates by a set angle in the process of the linear displacement of the second slider 5, Since the time for each drive roller to contact the roller contact surface can be shortened in the process of causing the switch to perform a series of operations, the burden on each part of the drive roller and roller contact surface is reduced and the energy storage drive mechanism The lifetime can be extended.

  As described above, similarly to the conventional example shown in Patent Document 4, the driving roller that linearly displaces together with the slider 5 is fitted into the guide slot provided on the crank plate side, and the driving roller is guided by the guide slot. However, when the crank plate 20 is rotated by converting the linear displacement of the slider 5 into a rotational displacement by linearly displacing the slider 5 in order to smoothly displace the roller along the guide slot, Since there is a limit to increasing the curvature, it is difficult to cope with a case where the operating torque required by the switch shows a relatively sudden change.

  Therefore, in the present invention, the use of the guide slot is eliminated, and any of the driving rollers r1 to r5 is in contact with only the roller contact surface existing on the front side in the displacement direction of the slider 5 in the process of linear displacement of the slider 5. The crank plate 20 is configured to rotate by pushing the drive units 40 and 41 in the displacement direction of the slider 5.

  Accordingly, when a portion regarded as a slot is formed around the roller contact surface of the driven portion provided on the crank plate 20 side, the width dimension of the portion regarded as the slot is set sufficiently large, and the driving roller When the driven portion is pushed to rotate the crank plate, the driving roller is prevented from coming into contact with the roller contact region located on the rear side in the displacement direction of the slider.

  For example, in the illustrated example, the interval between the roller contact areas Sc2 and Sc6 is set larger than the diameter of the drive roller r3, and the drive roller r3 pushes the roller contact area Sc2 so that the crank plate 20 is rotated clockwise in the drawing. When rotating, the drive roller r3 is prevented from contacting the roller contact area sc6.

  In the above embodiment, the linear displacement in one direction of the second slider 5 is converted to the rotational displacement and transmitted to the crank plate 20 and the linear displacement in the other direction of the second slider 5. A total of five drive rollers r <b> 1 to r <b> 5 are provided as drive rollers used for transmission to the crank plate 20, and one of the drive rollers r <b> 3 is provided in one direction of the second slider 5. One of the driving rollers used for converting the linear displacement into a rotational displacement and transmitting it to the crank plate 20 and the linear displacement of the second slider 5 in the other direction into the rotational displacement and transmitting it to the crank plate 20 The displacement transmission mechanism 12 is configured to function as a common roller that also serves as one of the drive rollers used in the above. The five driving rollers r1 to r5 are arranged such that the central axis of the common roller r3 is on a reference plane P2-P2 perpendicular to the displacement direction of the second slider 5 at a position that bisects the second slider 5 in the displacement direction. Are positioned symmetrically with the reference plane P2-P2 as the symmetry plane.

  With this configuration, the characteristics of the operating torque with respect to the rotation angle of the crank plate 20 are the same regardless of whether the second slider 5 is displaced in one direction or in the other direction. be able to.

  Further, in either case of displacing the second slider 5 in one direction or in the other direction, three driving rollers (r2, r3, r4 or r1, r3, r5) are driven parts 40. , 41 in order to convert the displacement of the second slider 5 into a rotational displacement in order to come into contact with a predetermined region of the roller contact surface of each of the roller rollers in the process of causing the switch to perform a series of operations for tap switching. It is possible to shorten the time during which the roller contacts the roller contact surface, thereby reducing the burden on the drive roller and each part of the roller contact surface and extending the life of the energy storage drive mechanism. Moreover, if comprised as mentioned above, the number of drive rollers can be saved and the displacement transmission mechanism 12 can be comprised compactly.

  In the above embodiment, three drive rollers are used to convert the linear displacement of each direction of the second slider 5 into a rotational displacement and transmit it to the crank plate 20. The displacement transmission mechanism 12 can be configured to use four or more drive rollers to convert linear displacement in each direction into rotational displacement and transmit it to the crank plate 20.

  In the above embodiment, since the operation shaft 8 driven by the electric operation device or the like passes through the rotation drive shaft 7 and is connected to the tap selector, the operation shaft 8 and the crank plate 20 have their respective axes. If the operation shaft 8 does not need to pass through the rotary drive shaft 7 due to the positional relationship between the operation shaft 8 and the tap selector, the axis of the crank plate 20 and the operation shaft are arranged. It is not always necessary to match the 8 axis.

  In the example shown in FIGS. 8 to 10, the energy storage mechanism is configured to store the spring by the displacement of the first slider 4 that is linearly displaced with the rotation of the operation shaft 8. The biasing mechanism may be configured to store the spring by compressing or extending the spring by a member that is operated and displaced by an operating device such as an electric operating device. It is not limited to the one shown in FIG.

DESCRIPTION OF SYMBOLS 1 Energy storage drive mechanism 2 Frame 4 1st slider 5 2nd slider 6 Spring 7 Rotation drive shaft (axis which drives a switch)
8 Operation shaft operated to store spring 9 Insulated drive shaft 10 Cam mechanism 11 Latch mechanism 12 Displacement transmission mechanism 14a, 14b Guide rod 15a, 15b Guide rod 16 Guide 17 Eccentric disc 20 Crank plate 21 Drive plate 22 Pins 20a, 20b Recesses 25, 26 provided on the outer periphery of the crank plate 25, 26 Latch lever 29 Return spring 30 Latch release member 40, 41 Driven portion r1 to r5 Drive roller Sc1 to Sc8 Roller contact roller formed on the driven portion Contact area P1-P1 First reference plane P2-P2 Second reference plane P3-P3 Third reference plane

Claims (7)

A switch that opens and closes when switching the tap of the transformer; and an accumulator drive mechanism that outputs an operation torque necessary to operate the switch, and the accumulator drive mechanism stores the spring An energy storage mechanism, a slider that is driven by the spring and linearly displaced along one plane, and an axis that is disposed so as to face the slider and extends in a direction perpendicular to the plane rotates around a rotation center axis. And a displacement transmission mechanism for converting a linear displacement of the slider into a rotational displacement and transmitting it to the crank plate, and configured to output the operation torque from the crank plate. In the on-load tap changer,
The displacement transmission mechanism includes a plurality of driving rollers disposed in a space between the slider and the crank plate and supported by the slider, and a plurality of the driving rollers in a process in which the slider linearly displaces. At least one driven part fixed to the crank plate having a roller contact surface that contacts any one of the side surfaces facing the space, and any of the driving rollers in the process of linear displacement of the slider The crank plate is configured to rotate by pushing the driven portion in the displacement direction of the slider in contact with only the roller contact surface existing on the front side in the displacement direction of the slider,
Necessary for operating the switch at each rotation angle position of the crank plate, and the driving roller that pushes the driven portion is replaced every time the crank plate rotates by a set angle in the process of linear displacement of the slider. So as to obtain various operating torques, the positional relationship between the plurality of driving rollers, the positional relationship between the plurality of driving rollers and the roller contact surface, the profile of the roller contact surface, and the roller contact surface And a distance between each part of the crank plate and the center of rotation of the crank plate is set.   A plurality of unit sections arranged in the displacement direction of the slider are set in the displacement section of the slider, and a roller contact area corresponding to each of the plurality of unit sections is set on the roller contact surface. 2. The structure according to claim 1, wherein a predetermined driving roller of the plurality of driving rollers is in contact with a roller contact area corresponding to each unit section while displacing the unit section. Tap switching device when loaded. A switch that performs an opening / closing operation when switching taps of the transformer, and an energy storage drive mechanism that outputs an operation torque necessary for operating the switch, the energy storage drive mechanism being disposed oppositely. The first and second sliders supported so as to be slidable in one direction and the other direction along one plane, and the first slider is reciprocally displaced along with the rotation of the operation shaft driven by the operating device. And a cam mechanism for transmitting the rotation of the operating shaft to the first slider, and the first slider is provided between the first slider and the second slider. A spring that accumulates energy in the process of displacement and biases the second slider in one direction and the other direction, and an axis that is arranged to face the slider and extends in a direction perpendicular to the plane rotates around I can do it And a displacement transmission mechanism that converts the displacement of the second slider generated by the biasing force of the spring into a rotational displacement and transmits the rotational displacement to the crank plate. In the on-load tap switching device configured to output the operation torque,
The displacement transmission mechanism is disposed in a space between the second slider and the crank plate, and contacts a plurality of driving rollers supported by the second slider and any of the plurality of driving rollers. And at least one driven portion fixed to the crank plate with a roller contact surface facing the space, and in the course of linear displacement of the second slider, Any one of them is configured to rotate the crank plate by pressing only the driven part in the displacement direction of the second slider in contact with only the roller contact surface existing on the front side in the displacement direction of the slider. ,
Each time the crank plate rotates at a set angle in the course of the linear displacement of the second slider in each direction, the driving roller that pushes the roller contact surface is replaced, and the switch at each rotation angle position of the crank plate The positional relationship between the plurality of driving rollers, the positional relationship between the plurality of driving rollers and the roller contact surface, and the profile of the roller contact surface so that the operation torque necessary for operating the roller is obtained. And a distance between each part of the roller contact surface and the rotation center of the crank plate is set,
An on-load tap changer.   A plurality of unit sections arranged in the displacement direction of the slider are set in a displacement section when the second slider is linearly displaced in each direction, and a roller contact area corresponding to each of the plurality of unit sections is set in the covered section. It is set on the roller contact surface of the drive unit so that a predetermined drive roller of the plurality of drive rollers contacts a roller contact area corresponding to each unit section while the slider displaces each unit section. The on-load tap switching device according to claim 3, wherein the tap switching device is loaded. Three or more driving rollers are provided to convert linear displacement in each direction of the second slider into rotational displacement and transmit it to the crank plate,
All the driving rollers used to convert the linear displacement in one direction of the second slider and the linear displacement in the other direction into a rotational motion and transmit them to the crank plate, divide the second slider in the displacement direction in two minutes. 5. The on-load tap switching device according to claim 3, wherein the tap switching device is loaded symmetrically with a reference plane orthogonal to the displacement direction of the second slider as a symmetry plane at a position where the second slider moves. A linear displacement in one direction of the second slider is converted to a rotational displacement and transmitted to the crank plate, and a linear displacement in the other direction of the second slider is converted into a rotational displacement. A total of five drive rollers are provided as drive rollers used for transmission to the crank plate, and one of the five drive rollers is a straight line in one direction of the second slider. It functions as a common roller that serves as one of the drive rollers used to transmit the displacement to the crank plate and one of the drive rollers used to transmit the linear displacement in the other direction of the second slider to the crank plate. The displacement transmission mechanism is configured as follows,
The five drive rollers are in a state in which the central axis of the common roller is positioned on a reference plane orthogonal to the displacement direction of the second slider at a position that bisects the second slider in the displacement direction. 5. The on-load tap switching device according to claim 3, wherein the tap switching device is placed symmetrically with respect to the reference plane as a symmetry plane. The plurality of driving rollers include a rotation center axis of the crank plate and are orthogonal to the first reference plane from a first reference plane (P1-P1) that is a plane along the displacement direction of the second slider. The first and the second are arranged symmetrically with respect to the second reference plane (P2-P2), which is a plane perpendicular to the first reference plane, and is positioned at a certain distance in the direction. Two driving rollers (r1 and r2), the first and second driving rollers (r1 and r2), and the first reference plane (P1-P1), and a central axis is the first axis A third driving roller (r3) disposed on a second reference plane (P2-P2), the first and second driving rollers (r1 and r2), and a third driving roller ( r3) is flat with the first reference plane (P1-P1). The first and second drive rollers (r1) have a central axis positioned on a third reference plane (P3-P3), which is a plane extending in the direction, and the second reference plane (P2-P2) is a plane of symmetry. And r2) fourth and fifth drive rollers (r4 and r5) arranged in plane symmetry with an interval larger than the interval between them,
The first and second driving rollers (r1 and r2) are configured such that the first driving roller (r1) is more than the second driving roller (r2) when the second slider is displaced in one direction. 2 is arranged so as to be located on the front side in the displacement direction of the slider,
The fourth drive roller (r4) is disposed on the same side as the second drive roller (r2) with respect to the second reference plane (P2-P2), and the fifth drive roller (r5). Is disposed on the same side as the first drive roller (r1) with respect to the second reference plane (P2-P2),
First to fourth unit sections arranged in order along the one direction are set in a displacement section when the second slider is displaced in the one direction, and the second slider is displaced in the other direction. The fifth to eighth unit sections arranged in order along the other direction are set in the displacement section at the time,
The roller contact surface of the driven portion is a first roller with which the first driving roller (r1) contacts when the second slider is in the first unit section in the process of displacing in the one direction. When the second slider is in the second unit section in the course of the displacement of the second slider in the one direction with the contact area (Sc1), the third driving roller (r3) contacts Two roller contact areas (Sc2) and the first driving roller (r1) when the second slider is in the third unit section in the course of displacement of the second slider in the one direction. A third roller contact area (Sc3) that contacts the fourth drive roller (Sc3) when the second slider is in the fourth unit section in the course of displacement of the second slider in the one direction. r4) is in contact with the fourth roller contact area (Sc 4) and a fifth roller contact area (Sc5) with which the second driving roller (r2) contacts when the second slider is in the fifth unit section in the process of displacing in the other direction; A sixth roller contact area (Sc6) with which the third driving roller (r3) contacts when the second slider is in the sixth unit section in the course of displacement of the second slider in the other direction. And a seventh roller contact region (2) where the second drive roller (r2) contacts when the second slider is in the seventh unit section in the process of displacing the second slider in the other direction. Sc7) and the eighth roller contact with which the fifth driving roller (r5) contacts when the second slider is in the eighth unit section in the process of the second slider being displaced in the other direction. Having a region (Sc8),
The on-load tap switching device according to claim 3.

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