Switching device

Abstract

To enable the suction force to a movable iron core of a coil to be secured without increasing the size of a connection member and an opening / closing switching device.SOLUTION: An opening / closing switching device comprises a main circuit unit which can switch a power source that supplies power to a load apparatus between a first power source and a second power source, and a control unit which can control switching of the power source that supplies power to the load apparatus. The control unit includes a first solenoid 32b, a second solenoid 32c, and a connection member 32ac. Each of a movable iron core of the first solenoid and a movable iron core of the second solenoid includes a main part whose diameter is maximum, an arm part which is configured so as to have a smaller diameter than the main part on the connection member side with respect to the main part, and a groove part which is provided in the arm part so as to connect the connection member to the arm part. By conducting electricity to a coil and moving the movable iron core such that at least a portion of the main part moves in the coil, a power source that supplies power to the load apparatus can be switched.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a changeover switchgear. [Background technology]

[0002] There is known a changeover switchgear that switches the power source for supplying power to a load device between a commercial power source as a first power source and a distributed power source as a second power source. This changeover switchgear is generally switched by a solenoid, as described in Patent Document 1. For example, it is known that when a movable iron core is attracted into a magnetized coil by energizing the solenoid coil, a crossbar is interlocked with this to switch the changeover switchgear. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-272077

[0004] When current is applied to the coil, the movable core moves as it is attracted to the inside of the magnetized coil. If the diameter of the movable core is approximately the same as or slightly smaller than the diameter of the inside of the coil, the attractive force is greater, and the movable core is attracted with even greater force. On the other hand, if the diameter of the movable core is approximately the same from the end on the connecting member side to the end on the solenoid side, the diameter of the end of the movable core on the connecting member side will also be larger, which will result in the size of the connecting member to which the movable core is connected and other components related to the connecting member. Ultimately, this will result in the entire changeover switchgear becoming larger. Summary of the Invention [Problem to be solved by the invention]

[0005] The inventors of the present invention have diligently studied this point and have attempted to solve it. The problem that the present invention aims to solve is to ensure the attractive force of the coil to the movable core without increasing the size of the connecting member or the changeover switchgear. [Means for solving the problem]

[0006] In order to solve the above problems, there is provided a changeover switchgear including a first power source side terminal portion connectable to a first power source, a second power source side terminal portion connectable to a second power source, a load side terminal portion connectable to a load device, a main circuit unit capable of switching the power source for supplying power to the load device between the first power source and the second power source, and a control unit capable of controlling the switching of the power source for supplying power to the load device, wherein the control unit controls a first solenoid having a coil and a movable iron core, a second solenoid having a coil and a movable iron core, and a switching circuit between the coil of the first solenoid and the coil of the second solenoid. The switching switch device comprises a connecting member that connects the movable iron core of the first solenoid and the movable iron core of the second solenoid, and each of the movable iron cores of the first solenoid and the second solenoid has a main portion that is the largest diameter, an arm portion that is configured to be smaller in diameter than the main portion on the connecting member side of the main portion, and a groove portion provided in the arm portion for connecting the connecting member to the arm portion, and is capable of switching the power source that supplies power to the load equipment by passing current through the coil and moving the movable iron core so that at least a part of the main portion moves within the coil.

[0007] It is also preferable that a part of the main portion of the movable core always remains inside the coil.

[0008] It is also preferable that the maximum diameter of the movable core is substantially the same as the maximum inner diameter of the coil. [Effects of the Invention]

[0009] In the present invention, the attractive force of the coil to the movable core can be ensured without increasing the size of the connecting member or the changeover switch device. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a changeover switching device according to an embodiment. [Figure 2] 2 is a front view of the changeover switchgear shown in FIG. 1, with the cover open. [Figure 3] 2 is a front view of the changeover switchgear shown in FIG. 1 disassembled into a switch and a control unit, with the cover closed. [Figure 4] 2 is an exploded perspective view of the changeover switchgear shown in FIG. 1 disassembled into a switch and a control unit, with the cover closed. [Figure 5] FIG. 10 is a perspective view showing an example in which some of the cases of three lined-up switches are removed. [Figure 6] FIG. 2 is a side view of a switch showing an example in which a part of the case is removed. [Figure 7] 10A and 10B are diagrams illustrating an example before and after connecting the connecting members. [Figure 8] 8A and 8B are diagrams showing an example of the state before and after connecting the connecting members, as seen from a different direction from that shown in FIG. 7. [Figure 9] FIG. 2 is a perspective view of the switcher switch device with the second case removed. [Figure 10] FIG. 2 is a perspective view showing an example of a main circuit unit, a first case, and a switching unit. [Figure 11] FIG. 11 is an exploded perspective view of the switching unit shown in FIG. [Figure 12] FIG. 12 is an exploded perspective view of the switching portion shown in FIG. [Figure 13] 10A and 10B are diagrams illustrating an example of how the switching unit moves. [Figure 14] FIG. 12 is a diagram of the first solenoid shown in FIG. [Figure 15] FIG. 15 is an exploded perspective view of the first solenoid shown in FIG. 14. [Figure 16] FIG. 1 is a perspective view of an example of a movable core. [Figure 17] FIG. 17 is a side view of the movable core shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the invention is described below. In the following description of the diverter switchgear 1, the side that faces the installation location when installed is referred to as the installation surface side, and the side opposite the installation surface side is referred to as the front side. The diverter switchgear 1 of the embodiment can automatically switch the power source that supplies power to the load equipment between a first power source and a second power source during a power outage or the like. Therefore, as can be seen from FIGS. 1 to 4 , the diverter switchgear 1 of the embodiment includes a main circuit unit 10 that can switch the power source that supplies power to the load equipment between the first power source and the second power source, and a control unit 30 that controls the switching of the power source that supplies power to the load equipment.

[0012] 5 and 6, this changeover switchgear 1 includes a main circuit unit 10 having a first power-supply side terminal portion 11 connectable to a first power source, a second power-supply side terminal portion 12 connectable to a second power source, and a load side terminal portion 13 connectable to a load device. More specifically, the main circuit unit 10 includes the first power-supply side terminal portion 11 to which a first power source (e.g., a commercial power source) located on one side is connected, the second power-supply side terminal portion 12 to which a second power source (e.g., a distributed power source) located on the other side is connected, and the load side terminal portion 13 to which a load device is connected. In the example shown in FIG. 1, the end portion of the first power-supply side terminal portion 11 (the end portion on which terminal screw 11c is attached), the end portion of the second power-supply side terminal portion 12 (the end portion on which terminal screw 12c is attached), and the end portion of the load side terminal portion 13 (the end portion on which terminal screw 13c is attached) are covered with a terminal cover 19 to prevent accidental contact therewith. Examples of distributed power sources include those that use renewable energy such as solar power generation and wind power generation, as well as fuel cells and storage batteries.

[0013] The main circuit unit 10 of the embodiment is provided with a switch 14 in which a first fixed contact 11a of the first power supply side terminal portion 11, a second fixed contact 12a of the second power supply side terminal portion 12, and a movable contact 13a of the load side terminal portion 13 are housed in a case 14a. The switches 14 may be connected in the number of poles required, but in the example shown in Figures 1 to 4, three switches 14 are connected to form a three-pole main circuit unit 10.

[0014] 6, the first power supply side terminal portion 11 of the embodiment has a first fixed contact 11a at one end and a screw hole 11b at the other end into which a terminal screw 11c for connecting an electric wire is screwed. The second power supply side terminal portion 12 has a second fixed contact 12a at one end and a screw hole 12b at the other end into which a terminal screw 12c for connecting an electric wire is screwed.

[0015] The load side terminal portion 13 of the embodiment includes a movable contactor 13e having two movable contacts 13a used to contact the first fixed contact 11a of the first power source side terminal portion 11 and the second fixed contact 12a of the second power source side terminal portion 12, a rotating member 13d that can switch the contact destination of the held movable contact 13a between the first fixed contact 11a and the second fixed contact 12a by rotating, and a terminal 13f having a screw hole 13b that is electrically connected to the movable contactor 13e via an electrical circuit member at one end and into which a terminal screw 13c for connecting an electric wire is screwed at the other end.

[0016] When the movable contact 13a comes into contact with the first fixed contact 11a of the first power source terminal 11, the first power source terminal 11 and the load terminal 13 are electrically connected via the movable contact 13a, and therefore it becomes possible to supply power from the first power source connected to the first power source terminal 11 to the load device connected to the load terminal 13. Furthermore, when the movable contact 13a comes into contact with the second fixed contact 12a of the second power source terminal 12, for the same reason, it becomes possible to supply power from the second power source to the load device.

[0017] In addition, when the power source for supplying power to the load device is switched between the first power source and the second power source, the movable contactor 13e is rotated by rotating the rotating member 13d. In this way, the contact point of the movable contact 13a can be switched between the first fixed contact 11a and the second fixed contact 12a, and the source of power supply to the load device can be switched between the first power source and the second power source.

[0018] In the embodiment, the case 14a constituting the outer casing of the switch 14 houses the first fixed contact 11a of the first power source side terminal 11, the second fixed contact 12a of the second power source side terminal 12, and the movable contact 13a of the load side terminal 13. By connecting a plurality of switches 14 each having such a case 14a, it is possible to configure the main circuit unit 10. When adjacent switches 14 are connected to each other, the rotating members 13d of the switches 14 are also connected, and all of the connected rotating members 13d are structured to move in unison.

[0019] For this reason, the case 14a of the switch 14 is provided with an opening 14b that allows a portion of the rotating member 13d to protrude outside the case 14a. At least one of the switches 14 adjacent to this switch 14 is provided with an opening 14c in its case 14a that allows a portion of the rotating member 13d of the adjacent switch 14 to enter. The openings 14b and 14c may be provided at positions that allow the rotating members 13d of the adjacent switches 14 to engage with each other and rotate.

[0020] Openings 14b and 14c may be large enough to cover the entire surface of case 14a, but from the perspective of preventing foreign matter from entering switch 14, openings 14b and 14c are preferably approximately the same size as the portion of rotating member 13d that protrudes from case 14a in a side view. If openings 14b and 14c are the same size, rotating member 13d will rub against case 14a when rotating, so it is preferable to leave a slight gap between them. Also, openings 14b and 14c are preferably circular.

[0021] In any case, for a switching device 1 having a plurality of "switches 14 each having a first power source side terminal portion 11, a second power source side terminal portion 12, a load side terminal portion 13, and a case 14a," it is preferable that the load side terminal portion 13 is provided with a rotating member 13d that rotatably holds the movable contact 13e, and that for at least one switch 14, a portion of the rotating member 13d protruding from an opening 14b provided in the case 14a of the switch 14 engages with the rotating member 13d located within the case 14a of the adjacent switch 14.

[0022] More specifically, the present invention relates to a power supply circuit including a first power source side terminal portion 11 connectable to a first power source and having a first fixed contact 11a, a second power source side terminal portion 12 connectable to a second power source and having a second fixed contact 12a, a load side terminal portion 13 connectable to a load device and having a movable contactor 13e with a movable contact 13a, and a case 14a that houses the first fixed contact 11a, the second fixed contact 12a, and the movable contact 13a therein, and a contact point of the movable contact 13a is arranged between the first fixed contact 11a and the second fixed contact 12a. The switching switchgear 1 is preferably provided with a plurality of switches 14 each capable of switching the power source for supplying electricity to a load device between a first power source and a second power source by switching, wherein the load side terminal portion 13 is provided with a rotating member 13d that rotatably holds a movable contact 13e, and wherein a portion of the rotating member 13d protruding from an opening 14b provided in a case 14a of at least one switch 14 engages with the rotating member 13d located in the case 14a of an adjacent switch 14. With this configuration, in the switching switchgear 1 provided with a plurality of switches 14, it is possible to simultaneously switch a plurality of switches 14 (a plurality of poles) of the switching switchgear 1 without inserting small connecting parts to fill gaps between the members that rotate when switching the switches 14 of the switching switchgear 1.

[0023] In addition, it is preferable that a control unit 30 capable of controlling the switching of the power supply to the load equipment by applying a load to the rotating member 13d is arranged adjacent to the switch 14, and that this control unit 30 is configured to engage with the rotating member 13d protruding from an opening 14b provided in the case 14a of the adjacent switch 14.

[0024] To facilitate connection of the rotating members 13d of adjacent switches 14, it is preferable to provide a recess or a protrusion on the connecting portion 13g of the rotating members 13d so that the rotating members 13d can be connected together by inserting the protrusion of one rotating member 13d into the recess of the other rotating member 13d (see FIGS. 7 and 8). It is also preferable to provide a recess or a protrusion on the connecting portion 13g so that the contact area is larger than when the connecting portion 13g is flat, as this makes it easier to transmit force.

[0025] As can be seen from the above, the main circuit unit 10 preferably includes a plurality of switches 14 each having a first power supply side terminal portion 11, a second power supply side terminal portion 12, a load side terminal portion 13, and a case 14a, and the rotating members 13d of the switches 14 are connected in a fitted state, allowing the switches 14 to move in conjunction with each other when the power source is switched. In this way, the rotating members 13d can be easily connected to each other, and the switches 14 can be easily connected.

[0026] In this embodiment, in order to standardize parts, the rotating members 13d of the three switches 14 have the same shape, and a convex portion provided on one surface of the rotating member 13d can be inserted into a concave portion provided on the other surface of the rotating member 13d. In this way, it is preferable that the shape of one surface of the rotating member 13d has concaves and convexes that correspond to the shape of the other surface.

[0027] Of course, the shape of the rotating member 13d may be configured to differ for each switch 14, or the shape of the rotating member 13d of one switch 14 may be configured to differ from the shape of the rotating member 13d of the other switches 14. For example, in a configuration in which three switches 14 are connected, the rotating member 13d of the central switch 14 may be provided with both a recessed portion and a protruding portion, but the rotating members 13d of the switches 14 at both ends may be provided with either a recessed portion or a protruding portion.

[0028] In the embodiment, the rotating member 13d of the switch 14 adjacent to the control unit 30 has a recess provided on its side, into which the connecting member 41 provided on the control unit 30 is inserted. In the embodiment, the connecting member 41 and the rotating member 13d are configured to rotate integrally. Therefore, by rotating the connecting member 41, the rotating member 13d rotates, and the contact destination of the movable contact 13a of the movable contactor 13e can be switched between the first fixed contact 11a and the second fixed contact 12a.

[0029] In this embodiment, the rotating member 13d has an engaging portion with a recess that is approximately rectangular when viewed from the direction of the rotation axis. To connect using this engaging portion, the connecting member 41 has an engaged portion at its end that is approximately rectangular and has a shape corresponding to the engaging portion of the rotating member 13d. However, the engaging portion and engaged portion may have any shape as long as they can engage with each other.

[0030] Furthermore, in this embodiment, in order to increase the load from the connecting member 41 to the rotating member 13d while reducing the size of the control unit 30, the cross section of the connecting member 41 perpendicular to the rotation axis is configured so that the cross section of the end of the connecting member 41 on the rotating member 13d side is larger than the cross section of the central part of the connecting member 41, thereby increasing the contact area between the rotating member 13d and the connecting member 41.

[0031] Incidentally, with regard to the connection between the rotating members 13d, even if the structure is such that the connection is made only by the engagement of the connecting portions 13g, the load of the connecting member 41 can be applied to the rotating members 13d, but a small gap will occur between the rotating members 13d that are engaged with each other.

[0032] This gap can have an effect when multiple rotating members 13d are connected together. Specifically, a misalignment occurs between the movement of the rotating member 13d located away from the connecting member 41 and the movement of the connecting member 41, which may prevent the load of the connecting member 41 from being applied properly.

[0033] Therefore, it is preferable to provide an insertion hole in the rotating member 13d, and to insert the inserting member 15 into the insertion hole of the rotating member 13d of the adjacent switch 14. If an insertion hole is provided in the rotating member 13d, and the inserting member 15 is inserted into the insertion hole so as to connect the rotating members 13d to be coupled, it is possible to restrict the movement of the rotating member 13d in a direction perpendicular to the axial direction of the inserting member 15. Therefore, it is possible to suppress the influence of a misalignment in the movement of the connecting member 41 and the rotating member 13d caused by a gap occurring between the rotating members 13d.

[0034] The position of the insertion hole of the rotating member 13d may be any position as long as the inserting member 15 can be inserted so as to connect the rotating members 13d that are to be coupled, but it is preferable to configure the insertion hole so that the inserting member 15 passes through the rotation center of the rotating member 13d. For example, when the rotating member 13d rotates around the engaging portion and / or the engaged portion, it is preferable to form the insertion hole in the engaging portion and / or the engaged portion that is the rotation center.

[0035] By inserting inserting member 15 into an insertion hole provided in the engaging portion and / or the engaged portion, it becomes easier to restrict the movement of rotating member 13d in directions perpendicular to the axial direction of inserting member 15 in all directions, making it easier to deal with misalignment in the movements of connecting member 41 and rotating member 13d. Furthermore, by providing inserting member 15 at the position of the center of gravity of rotating member 13d, it is expected that misalignment in the movement of rotating member 13d will be further suppressed.

[0036] In the embodiment, a recess is provided on one side of the rotating member 13d, and a protrusion is provided on the other side. The protrusion of the rotating member 13d of one switch 14 is inserted into the recess of the rotating member 13d of another switch 14, and a connecting pin is inserted as the insertion member 15 into the insertion hole provided in the rotating member 13d. By configuring the protrusion of the rotating member 13d to be inserted into the recess of the rotating member 13d and the connecting pin inserted into the insertion hole to suppress misalignment between the rotating members 13d, it is possible to suppress separation between the rotating members 13d. Note that in the case where the connected state of the rotating members 13d is not visible from the outside of the switch device 11 as in the embodiment, it is particularly preferable that misalignment between the rotating members 13d can be suppressed.

[0037] Furthermore, it is preferable that the load side terminal portion 13 is provided with a rotating member 13d that rotates to switch the power source for supplying power to the load device between the first power source and the second power source, and that the control unit 30 is provided with a connecting member 41 that fits with the rotating member 13d and a handle attachment portion 42 that can be used to attach a handle 81 to the connecting member 41. In this way, the connecting member 41 having the handle attachment portion 42 and the rotating member 13d are fitted together and move in conjunction with each other, thereby enabling the power source to be switched.

[0038] Furthermore, when the handle 81 is attached to the handle attachment portion 42, it is preferable that the connecting member 41 and the rotating member 13d be linked together to switch the power supply by moving the handle 81, and when the handle 81 is not attached to the handle attachment portion 42, it is preferable that the connecting member 41 and the rotating member 13d be linked together to switch the power supply by moving the connecting member 41 with an electrical force generated by the control unit 30. In this way, it is only necessary to move the connecting member 41 whether performing an electrical operation or a manual operation, which makes it possible to reduce the number of parts.

[0039] Next, we will explain in detail the control unit 30. The control unit 30, which is connected to the main circuit unit 10, is connected to the side of the main circuit unit 10. This control unit 30 can perform control to switch the power supply source to the load side terminal section 13 of the main circuit unit 10 between the first power source and the second power source.

[0040] The control unit 30 of the embodiment has a main outer shell formed by a case member 31. The case member 31 of the embodiment is box-shaped and made up of a first case 31a and a second case 31b, and houses a switching unit 32 and a switch unit 33 (see FIG. 9). However, the switch unit 33 is not essential to the control unit 30, and it is sufficient if it houses at least the switching unit 32.

[0041] In the embodiment, the first case 31a of the control unit 30 and the switch 14 adjacent to the first case 31a are fixed with screws or the like, thereby fixing the main circuit unit 10 and the control unit 30. In the embodiment, the switches 14 are also fixed to each other by using screws that penetrate all of the switches 14 constituting the main circuit unit 10 and the first case 31a.

[0042] In the embodiment, the switching unit 32 provided in the control unit 30 includes a switching section 32a, a first solenoid 32b, a second solenoid 32c, a first relay unit 32d, and a second relay unit 32e (see Figures 10 and 11).

[0043] In the embodiment, the first relay unit 32d includes a circuit board 32dc to which a relay 32db is connected via a connector 32da. The second relay unit 32e includes at least a circuit board 32ec to which a relay 32eb is connected via a connector 32ea. These relay units, together with a switch unit 33 (described later), control the flow of electricity to the solenoid coil.

[0044] The switching unit 32a of the embodiment has an operating pin 32aa inserted through its center, and includes a support base 32ab that supports each component, a connecting member 32ac that can connect the first movable iron core 32ba provided in the first solenoid 32b and the second movable iron core 32ca provided in the second solenoid 32c to its ends, the operating pin 32aa inserted through the connecting member 32ac, a switching member 32ad through which the operating pin 32aa is inserted together with the connecting member 32ac, a connecting member 41 inserted through the switching member 32ad, and a display member 32ae through which the connecting member 41 is inserted together with the switching member 32ad (see Figures 11 to 13).

[0045] In this embodiment, the first solenoid 32b includes a first coil 32bb, a first fixed core provided within the coil, a first movable core 32ba that moves with a portion inserted within the first coil 32bb, and a frame 32bc that covers the first coil 32bb. The second solenoid 32c includes a second coil, a second fixed core provided within the second coil, a second movable core 32ca that moves with a portion inserted within the second coil, and a frame 32cc that covers the second coil. In each solenoid, the movable core is disposed so as to protrude from the end of the coil opposite the end where the fixed core is provided.

[0046] The switching performed automatically by the changeover switchgear 1 of the embodiment is performed using two solenoids (first solenoid 32b and second solenoid 32c). Each solenoid has at least a coil, a movable iron core, and a fixed iron core. When electricity is applied to the coil of the solenoid, the inside of the energized coil is magnetized, and an attractive force acts to move the movable iron core toward the inside of the coil.

[0047] The difference between the outer diameter of the movable core and the inner diameter of the coil affects the strength of the force that attracts the movable core. For example, the attracting force can be strengthened by making the outer diameter of the movable core located inside the coil approximately the same size as the inner diameter of the coil.

[0048] On the other hand, the switching device 1 of the embodiment has a connecting member 32ac arranged between a first solenoid 32b and a second solenoid 32c arranged opposite to each other, and is provided with a mechanism that moves the connecting member 32ac toward the solenoid including the coil (for example, the first solenoid 32b) when current is applied to the coil located on one side of the connecting member 32ac, and moves the connecting member 32ac toward the solenoid including the coil (for example, the second solenoid 32c) when current is applied to the coil located on the other side (see FIG. 13). With this configuration, it is possible to switch the power source applied to the load.

[0049] With this configuration, when the connecting member 32ac moves to one solenoid side (for example, the first solenoid 32b side), the movable iron core on the other solenoid side (for example, the second solenoid 32c side) is pulled by the connecting member 32ac and pops out of the coil.

[0050] Movement of the linking member 32ac moves the connecting member 41 connected to the rotating member 13d, but if the portion of the movable core near the linking member 32ac is large, it becomes difficult to compact the mechanism for achieving this movement. More specifically, if the portion of the movable core near the linking member 32ac is large, it becomes difficult to compact the size of components located between the first solenoid 32b and the second solenoid 32c, such as the linking member 32ac, and the components covering them. As a result, it becomes difficult to compact the size of the control unit 30. For this reason, it is preferable to make the portion of the movable core near the linking member 32ac smaller. However, if the entire movable core is made smaller, it becomes difficult to ensure a large force to attract the movable core.

[0051] In order to maintain the magnitude of the force that attracts the movable iron core while achieving a compact configuration, it is preferable that the movable iron core be configured to include a main portion 321 which is the part with the largest diameter and at least a part of which is movable within the coil, an arm portion 322 which is configured to have a smaller diameter than the main portion 321 and is closer to the connecting member 32ac than the main portion 321, and a groove portion 323 provided in the arm portion 322 to connect the connecting member 32ac to the arm portion 322.

[0052] More specifically, the changeover switchgear 1 includes a first power source side terminal portion 11 connectable to a first power source, a second power source side terminal portion 12 connectable to a second power source, a load side terminal portion 13 connectable to a load device, a main circuit unit 10 capable of switching the power source for supplying power to the load device between the first power source and the second power source, and a control unit 30 capable of controlling the switching of the power source for supplying power to the load device, wherein the control unit 30 controls a first solenoid 32b having a coil and a movable iron core, a second solenoid 32c having a coil and a movable iron core, and a second solenoid 32c having a coil and a movable iron core, and a first solenoid 32b having a movable iron core and a second solenoid 32c having a movable iron core and a second solenoid 32b having a movable iron core and a second solenoid 32c having a movable iron core and a second solenoid 32b having a movable iron core and a second solenoid 32c having a movable iron core and a first solenoid 32b having a movable iron core and a second solenoid 32c having a movable iron core and a second ... and a connecting member 32ac that connects the movable iron core of solenoid 32c, wherein each of the movable iron cores of first solenoid 32b and second solenoid 32c has a main portion 321 that is the largest diameter portion, an arm portion 322 that is configured to have a smaller diameter than main portion 321 on the connecting member 32ac side of main portion 321, and a groove portion 323 that is provided in arm portion 322 for connecting connecting member 32ac to arm portion 322, and wherein the power source that supplies power to the load device can be switched by passing current through the coil to move the movable iron core so that at least a part of main portion 321 moves within the coil. With this configuration, the attractive force of the coil to the movable iron core can be ensured without increasing the size of connecting member 32ac or the switching switchgear 1.

[0053] Furthermore, it is preferable that a part of the main part 321 of the movable iron core always remains inside the coil, which makes it easy to ensure the magnitude of the force at the timing when current flows through the coil and the movable iron core starts to move.

[0054] It is also preferable that the maximum diameter of the movable core is substantially the same as the maximum inner diameter of the coil, which makes it easier to ensure the magnitude of the force that moves the movable core when a current is passed through the coil.

[0055] It is preferable that when the movable core moves maximally toward the coil, at least half of the area of ​​the movable core that protrudes from the coil is arm portion 322. It is even more preferable that when the movable core moves maximally toward the coil, at least 70% or at least 90% of the area of ​​the movable core that protrudes from the coil is arm portion 322.

[0056] Furthermore, when a frame body covering the coil is provided outside the coil, it is preferable to configure it so that when the movable core moves to the maximum extent toward the coil, 80% or more of the area of ​​the movable core that protrudes from the frame body toward the connecting member 32ac side is the arm portion 322. It is even more preferable to configure it so that when the movable core moves to the maximum extent toward the coil, 90% or more or the entire area of ​​the movable core that protrudes from the frame body toward the connecting member 32ac side is the arm portion 322 (see FIGS. 14 and 15).

[0057] The movable core of the embodiment has a groove 323 in the arm 322, which has a smaller outer diameter than the remaining portion and into which a part of the connecting member 32ac is inserted (see FIGS. 14 to 17). In the embodiment, the outer diameter of the part of the arm 322 excluding the groove 323 is made substantially the same, but the outer diameter of part of the arm 322 may also be made different from that of the part other than the groove 323, for example, by making the outer diameter of the part that engages with the connecting member 32ac larger than that of the remaining portion in order to increase the contact area with the connecting member 32ac. However, it is preferable that the outer diameter of the arm 322 excluding the groove 323 be made substantially the same, since this makes it easier to reduce the size of parts between the two solenoids (see FIGS. 16 and 17).

[0058] However, the main portion 321 of the movable core in this embodiment does not extend to the end on the coil side. The movable cores shown in Figures 16 and 17 are configured so that their outer diameters gradually decrease toward the end on the coil side. More specifically, the movable cores shown in Figures 16 and 17 have a truncated cone-shaped end on the coil side. This shape corresponds to the shape of the fixed core located inside the coil.

[0059] Here, the energization signal to the coil will be described. The energization of the coil may be triggered by the relay unit detecting the presence or absence of energization from the first power source or the second power source, or by the relay unit detecting the lapse of a predetermined time period. For example, when there is energization from the first power source but not from the second power source, the first coil 32bb is energized, and switching is made to the first power source side. When there is no energization from the first power source but there is energization from the second power source, the second coil is energized, and switching is made to the second power source side.

[0060] Typically, the first power source, which is a commercial power source, is configured to take priority over the second power source, which is a distributed power source. For example, when both the first power source and the second power source are energized, the first power source is given priority, and the first coil 32bb is energized, switching to the first power source. Therefore, the second power source is used when there is no energization from the first power source but there is energization from the second power source.

[0061] However, if the coil continues to be energized as long as the relay unit continues to detect energization from each power source, there is a risk of the coil burning out. If the coil burns out, the control unit 30 will no longer be able to perform automatic switching. For this reason, it is preferable to configure the coil so that it is energized only for a certain period of time after the relay unit detects energization from each power source. In this embodiment, the switch unit 33 plays a role in energizing the coil only for a certain period of time after the relay unit detects energization from each power source.

[0062] For example, a switch can be connected to each relay unit, and when the switch is pressed by the operating pin 32aa that moves as a result of the movement of the connecting member 32ac caused by the attraction of the movable iron core after the coil is energized, the mechanism stops the energization of the coil. In this case, when the switch is not pressed, the energization of the coil is permitted, so when the coil is energized on the side where the switch is not pressed, the switch switches to that side.

[0063] Here, an example of switching using the control unit 30 will be described. However, the explanation will be given by taking an example in which the power source supplied to the load device by the control unit 30 is switched from the second power source to the first power source. Note that the flow of operation is similar even when switching from the first power source to the second power source, so the explanation of that example will be omitted.

[0064] First, an example of electrical switching will be described. When switching is performed electrically, a current is applied to the first coil 32bb of the first solenoid 32b. This generates a magnetic field inside the first coil 32bb, which magnetizes the first movable core 32ba and attracts it to the first fixed core. As the first movable core 32ba is attracted, the connecting member 32ac, to which the tip of the first movable core 32ba is connected, moves toward the first power source (see FIG. 13).

[0065] This movement of the coupling member 32ac causes the operation pin 32aa inserted through the coupling member 32ac to move toward the first power source. When the operation pin 32aa moves, the angle of the switching member 32ad through which the operation pin 32aa is inserted changes. This change in the angle of the switching member 32ad changes the angle of the connection member 41 communicated with the switching member 32ad. This change in the angle of the connection member 41 causes the rotating member 13d of the switch 14 fitted to the connection member 41 to rotate. The rotation of the rotating member 13d causes the movable contact 13a of the load side terminal 13, which contacts the second fixed contact 12a of the second power source side terminal 12, to contact the first fixed contact 11a of the first power source side terminal 11. The change in the angle of the connection member 41 also changes the angle of the indicator member 32ae, which is communicated with the connection member 41. The change in the angle of the indicator member 32ae indicates that the load side terminal 13 is connected to the first power source side terminal 11.

[0066] Next, an example of manual switching will be described. In the case of manual switching, switching is performed using a handle 81 that can be attached to and detached from the changeover switch device 1. The connecting member 41 has a handle attachment part 42 at the end opposite to the end where the switch 14 is fitted. It is preferable that unused handles 81 can be fixed to the side of the changeover switch device 1, etc., so that the handle 81 is not lost after being removed from the handle attachment part 42. In the example shown in Fig. 1, the handle 81 can be inserted into a protrusion provided on the control unit 30 and fixed.

[0067] When switching manually, first, the handle 81 is attached to the handle attachment portion 42. The handle 81 is tilted from the second power source side to the first power source side. Tilt of the handle 81 changes the angle of the connecting member 41. Changing the angle of the connecting member 41 rotates the rotating member 13d of the switch 14 fitted to the connecting member 41. Rotation of the rotating member 13d causes the movable contact 13a of the load side terminal 13, which contacts the second fixed contact 12a of the second power source side terminal 12, to contact the first fixed contact 11a of the first power source side terminal 11. Changing the angle of the connecting member 41 also changes the angle of the indicator member 32ae, which is connected to the connecting member 41. Changing the angle of the indicator member 32ae indicates that the load side terminal 13 is connected to the first power source side terminal 11, just like in the example above. When the operation is completed, the handle 81 can be removed from the handle attachment portion 42. Thereafter, the cover 38 is moved so that the handle attachment portion 42 is covered with the cover 38 .

[0068] The changeover switchgear 1 of the embodiment is attached to a box for storing electrical and electronic equipment. The box for storing electrical and electronic equipment is used to store electrical and electronic equipment such as circuit breakers, switches 14, transformers, relays, communication devices, measuring devices, control devices, sensor devices, air conditioners, and servers in the box body, and refers to, for example, a distribution board, a switchboard, a control panel, a high-voltage power receiving equipment (including a cubicle-type high-voltage power receiving equipment), a system rack, etc.

[0069] Although the present invention has been described above by taking the embodiments as examples, the present invention is not limited to the above-described embodiments and can be embodied in various forms. [Explanation of symbols]

[0070] 1. Switchgear 10 Main circuit unit 11 First power supply side terminal section 12 Second power supply side terminal section 13 Load side terminal 30 Control Unit 32ac connecting member 32b First solenoid 32c Second solenoid 321 Main Section 322 Arm 323 Groove

Claims

1. A changeover switchgear including a first power source side terminal portion connectable to a first power source, a second power source side terminal portion connectable to a second power source, a load side terminal portion connectable to a load device, a main circuit unit capable of switching a power source for supplying power to the load device between the first power source and the second power source, and a control unit capable of controlling the switching of the power source for supplying power to the load device, The control unit a first solenoid having a coil and a movable core; a second solenoid having a coil and an armature; a connecting member that connects the movable iron core of the first solenoid to the movable iron core of the second solenoid between the coil of the first solenoid and the coil of the second solenoid; Equipped with The movable core of the first solenoid and the movable core of the second solenoid are The connector includes a main portion having a maximum diameter, an arm portion configured to have a smaller diameter than the main portion on the connecting member side, and a groove portion provided in the arm portion for connecting the connecting member to the arm portion, A switching switch that can switch the power source supplying power to a load device by passing current through the coil and moving the movable core so that at least a part of the main part moves within the coil.

2. 2. The changeover switch device according to claim 1, wherein a part of the main portion of the movable core always remains inside the coil.

3. 3. The changeover switch device according to claim 1, wherein the maximum diameter of the movable core is substantially the same as the maximum inner diameter of the coil.

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