Distribution panel

Abstract

The load required to manually rotate the operating shaft 51 in the power distribution panel is reduced. [Solution] The distribution panel includes an operating shaft 51 that rotates by manual operation, an opening / closing shaft 41 that rotates 90° in conjunction with the 180° rotation of the operating shaft 51, and a contact mechanism 42 that switches between a grounded state and an ungrounded state by the 90° rotation of the opening / closing shaft 41.

Description

Technical Field

[0001] The present disclosure relates to a switchboard.

Background Art

[0002] There has conventionally been proposed a switchboard in which in-board devices such as a circuit breaker or an earthing switch are housed in a housing. For example, Patent Document 1 discloses a configuration in which the opening / closing state of an earthing switch (ES) can be switched by rotating an operation shaft by manual operation of an operation handle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration of Patent Document 1, in order to switch the opening / closing state of the earthing switch, it is necessary to apply a large load to the operation shaft by manual operation. In view of the above circumstances, one aspect of the present disclosure aims to reduce the load required to rotate the operation shaft by manual operation.

Means for Solving the Problems

[0005] In order to solve the above problems, a switchboard according to one aspect of the present disclosure includes an operation shaft that rotates by manual operation, an opening / closing shaft that rotates by a second angle less than the first angle in conjunction with rotation of the first angle on the operation shaft, and a contact mechanism in which a grounded state and a non-grounded state are switched by rotation of the second angle on the opening / closing shaft.

Brief Description of the Drawings

[0006] [Figure 1] It is a cross-sectional view of a switchboard according to an embodiment. [Figure 2]This is a front view of the distribution panel, seen from the front. [Figure 3] This is a rear view of the distribution panel, seen from the back. [Figure 4] This is a magnified side view of the vicinity of the grounding switch. [Figure 5] This is a plan view of the grounding switch, seen from vertically above. [Figure 6] This is a perspective view of the interlocking mechanism. [Figure 7] This is a front view of the interlocking mechanism in an ungrounded state. [Figure 8] This is a front view of the interlocking mechanism in the grounded state. [Figure 9] This is an explanatory diagram illustrating the positional relationship between the regulating member and the opening / closing door. [Figure 10] This is an explanatory diagram of the locking hole and locking projection. [Figure 11] This is a cross-sectional view of the opening restriction mechanism in an ungrounded state. [Figure 12] This is a cross-sectional view of the opening restriction mechanism in a grounded state. [Figure 13] This is a cross-sectional view of the support member. [Modes for carrying out the invention]

[0007] The embodiments for implementing this disclosure will be described with reference to the drawings. The embodiments described below are exemplary embodiments that may be envisioned when implementing this disclosure. Therefore, the scope of this disclosure is not limited to the embodiments described below.

[0008] A: Embodiment Figure 1 is a cross-sectional view of a power distribution panel 100 according to one embodiment. The power distribution panel 100 in this embodiment is a power distribution device for distributing and interrupting power supplied from a power supply device (not shown). In the following description, three mutually orthogonal axes (X-axis, Y-axis, Z-axis) are assumed. The X-axis is an axis extending horizontally from the power distribution panel 100. The Y-axis is an axis extending in the depth direction from the power distribution panel 100. The XY plane is a plane parallel to the horizontal plane. The Z-axis is an axis extending vertically.

[0009] As illustrated in Figure 1, the power distribution panel 100 comprises a housing 10 and a plurality of internal components 20. The housing 10 is a hollow structure that houses the plurality of internal components 20. The housing 10 is formed of a conductor such as metal and is grounded. The plurality of internal components 20 include connecting cables 21, instrument current transformers 22, grounding switches 23, surge arresters 25, instrument transformers 26, main circuit busbars 27, and circuit breakers 29, etc. The grounding switches 23 and circuit breakers 29 constitute a switchgear for opening, closing, and protecting the power circuit.

[0010] The internal space of the enclosure 10 is divided into a wiring room 31, a busbar room 32, and a circuit breaker room 33. The wiring room 31 is the space located vertically downwards within the internal space of the enclosure 10. The connecting cables 21, instrument current transformers 22, grounding switches 23, surge arresters 25, and instrument voltage transformers 26 are installed in the wiring room 31. The busbar room 32 and the circuit breaker room 33 are located above the wiring room 31. The busbar room 32 is located in the +Y direction of the circuit breaker room 33. The main circuit busbar 27 is installed in the busbar room 32. In addition, circuit breakers 29 such as vacuum circuit breakers are installed in the circuit breaker room 33.

[0011] Figure 2 is a front view of the distribution panel 100 as seen from the -Y direction. As illustrated in Figures 1 and 2, an opening 11a and an opening 11b are formed in the wall-like portion of the housing 10 located in the -Y direction (hereinafter referred to as the "front section 11"). Opening 11a communicates with the wiring room 31, and opening 11b communicates with the circuit breaker room 33. Opening doors 12 and 13 are installed on the front section 11. Each of the opening doors 12 and 13 can be opened and closed relative to the housing 10.

[0012] The opening / closing door 12 is a plate-like member that switches between opening and closing the opening 11a corresponding to the wiring chamber 31. Specifically, the opening / closing door 12 has an edge located in the -X direction pivotally supported by the housing 10 by a hinge H and is openable and closable about a rotation axis along the Z axis. The opening / closing door 13 is a plate-like member that switches between opening and closing the opening 11b corresponding to the breaker chamber 33. Specifically, the opening / closing door 13 has an edge located in the -X direction pivotally supported by the housing 10 by a hinge H and is openable and closable about a rotation axis along the Z axis. The opening / closing door 12 is located below (-Z direction) the opening / closing door 13.

[0013] FIG. 3 is a rear view of the switchboard 100 as viewed from the +Y direction. As illustrated in FIGS. 1 and 3, openings 14a and 14b are formed in a wall-like portion (hereinafter referred to as the "rear surface portion 14") of the housing 10 located in the +Y direction. The opening 14a communicates with the busbar chamber 32, and the opening 14b communicates with the wiring chamber 31. A protective cover 15 and a protective cover 16 are installed on the rear surface portion 14.

[0014] The protective cover 15 is a plate-like member detachable from the housing 10 (rear surface portion 14). By attaching and detaching the protective cover 15 to and from the housing 10, the opening and closing of the opening 14a are switched. That is, the opening 14a is closed when the protective cover 15 is installed on the housing 10. The protective cover 15 is fixed to the housing 10 by a plurality of fasteners B such as bolts or screws, for example. A pair of handles 151 for the user to grip when attaching and detaching the protective cover 15 are installed on the outer wall surface of the protective cover 15.

[0015] The protective cover 16 is a plate-like member detachable from the housing 10. By attaching and detaching the protective cover 16 to and from the housing 10, the opening and closing of the opening 14b are switched. That is, the opening 14b is closed when the protective cover 16 is installed on the housing 10. The protective cover 16 is fixed to the housing 10 by a plurality of fasteners B such as bolts or screws, for example. A pair of handles 161 for the user to grip when attaching and detaching the protective cover 16 are installed on the outer wall surface of the protective cover 16.

[0016] The protective cover 15 is located above the protective cover 16. Also, the opening / closing door 12 and the protective cover 16 are located on opposite sides in the Y-axis direction with respect to the housing 10. That is, the opening / closing door 12 and the protective cover 16 face each other in the Y-axis direction with an interval corresponding to the internal space of the housing 10. The opening / closing door 13 and the protective cover 15 are located on opposite sides in the Y-axis direction with respect to the housing 10. That is, the opening / closing door 13 and the protective cover 15 face each other in the Y-axis direction with an interval corresponding to the internal space of the housing 10.

[0017] FIG. 4 is a side view showing an enlarged view of the vicinity of the grounding switch 23 in the internal space of the housing 10. In FIG. 4, the illustration of the release restriction mechanism 60 described later is omitted for convenience. FIG. 5 is a plan view of the grounding switch 23 as viewed from vertically above (+Z direction). The grounding switch 23 discharges the residual charge of each in-board device 20 by grounding the in-board devices 20 such as the connection cable 21.

[0018] As illustrated in FIGS. 4 and 5, the grounding switch 23 includes an opening / closing shaft 41 and a contact mechanism 42. The opening / closing shaft 41 is a columnar structure elongated in the X-axis direction. The opening / closing shaft 41 is rotatably supported about a central axis along the X-axis. That is, the opening / closing shaft 41 is rotatably installed in the housing 10. A gear 43 is installed at the end of the opening / closing shaft 41 located in the +X direction. The gear 43 is a bevel gear coaxially installed on the opening / closing shaft 41.

[0019] The contact mechanism 42 is composed of a plurality (three) of movable contacts 44. Each of the plurality of movable contacts 44 is an elongated conductor, for example, composed of a pair of conductive plates. The plurality of movable contacts 44 are installed on the opening / closing shaft 41 with an interval in the X-axis direction. Each movable contact 44 is an elongated conductor extending in the radial direction of the opening / closing shaft 41. Therefore, each movable contact 44 rotates about the opening / closing shaft 41 in conjunction with the rotation of the opening / closing shaft 41.

[0020] As illustrated in Figures 4 and 5, the internal space of the distribution panel 100 is equipped with a plurality (3) of fixed contacts 45 corresponding to different movable contacts 44. The plurality of fixed contacts 45 are positioned spaced apart in the +Y direction with respect to the opening / closing shaft 41 and are arranged with spacing between them in the X direction. Each fixed contact 45 is a conductor electrically connected to the equipment 20 inside the panel (e.g., a connecting cable 21).

[0021] The grounding switch 23 (contact mechanism 42) can be switched between a grounded state and an ungrounded state. In the ungrounded state, as illustrated in Figures 4 and 5, each movable contact 44 and each fixed contact 45 are electrically insulated from each other by being separated. Specifically, in the ungrounded state, the multiple movable contacts 44 are upright in the +Z direction from the opening / closing shaft 41. As described above, in the ungrounded state, the fixed contacts 45 do not contact the movable contacts 44, so each fixed contact 45 is not grounded.

[0022] On the other hand, the grounded state is a state in which each movable contact 44 and each fixed contact 45 are in contact with each other, as illustrated by dashed lines in Figures 4 and 5. Specifically, in the grounded state, multiple movable contacts 44 extend from the opening / closing shaft 41 in the +Y direction. As described above, in the grounded state, the fixed contacts 45 are in contact with the movable contacts 44, so the equipment 20 inside the panel (for example, the connecting cable 21) is grounded via each fixed contact 45, each movable contact 44 and the housing 10.

[0023] As described above, the angle between the direction in which each movable contact 44 extends in the grounded state and the direction in which each movable contact 44 extends in the ungrounded state is 90°. In other words, a 90° rotation of the opening / closing shaft 41 switches the contact mechanism 42 from one state to the other.

[0024] [Operation mechanism 50] As illustrated in Figure 1, an operating mechanism 50 is installed inside the housing 10. The operating mechanism 50 is a mechanism for a user of the distribution panel 100 (e.g., an operator or maintenance person) to manually switch the grounding switch 23 from a grounded state to an ungrounded state. The operating mechanism 50 includes an operating shaft 51, an operating handle 52, and an interlocking mechanism 53.

[0025] The operating shaft 51 is a cylindrical structure that is elongated in the direction of the Y-axis. That is, the operating shaft 51 and the opening / closing shaft 41 intersect (specifically, are orthogonal) with each other. The operating shaft 51 is supported so as to be rotatable about a central axis along the Y-axis. As described above, the operating shaft 51 is rotatably installed within the housing 10.

[0026] As illustrated in Figures 2 and 5, a display window 17 and a shaft hole 18 are formed in the front portion 11 of the housing 10, between the opening 11a (opening / closing door 12) and the opening 11b (opening / closing door 13). The display window 17 and the shaft hole 18 are spaced apart from each other in the direction of the X axis. The display window 17 is a rectangular opening for displaying the status of the contact mechanism 42 (grounded / ungrounded). Specifically, when the contact mechanism 42 is in the grounded state, the word "ON" is displayed in the display window 17, and when the contact mechanism 42 is ungrounded, the word "OFF" is displayed in the display window 17. The display of the status of the contact mechanism 42 will be described later. The display window 17 may be covered by a light-transmitting plate-like member.

[0027] The shaft hole 18 is a circular opening into which the operating shaft 51 is inserted. The end of the operating shaft 51 located in the -Y direction passes through the shaft hole 18 and protrudes to the outside of the housing 10. The operating handle 52 is connected to the end of the operating shaft 51 that protrudes to the outside of the housing 10. Specifically, the operating handle 52 is a long member perpendicular to the operating shaft 51. As illustrated by the dashed line in Figure 2, a user of the distribution board 100 can rotate the operating shaft 51 by rotating the operating handle 52 around the operating shaft 51 while gripping the operating handle 52. Specifically, a user can rotate the operating shaft 51 by 180° (angle θ1) by rotating the operating handle 52 180°. As described above, the operating shaft 51 is rotated by manual operation.

[0028] As illustrated in Figures 4 and 5, a gear 54 is installed at the end of the operating shaft 51 that is located opposite the operating handle 52 (in the +Y direction). The gear 54 is a bevel gear installed coaxially with the operating shaft 51. Gears 43 and 54 mesh with each other. Therefore, the opening / closing shaft 41 of the grounding switch 23 rotates in conjunction with the rotation of the operating shaft 51 by the user's manual operation.

[0029] The tooth ratio between gear 43 and gear 54 is set such that the rotation angle θ2 of the opening / closing shaft 41 is less than the rotation angle θ1 of the operating shaft 51 (θ2 < θ1). For example, the number of teeth of gear 43 is set to twice the number of teeth of gear 54. Therefore, when the operating shaft 51 is rotated 180° by manual operation of the operating handle 52, the opening / closing shaft 41 rotates 90° in conjunction with that rotation. As described above, in conjunction with the rotation of the operating shaft 51 by angle θ1, the opening / closing shaft 41 rotates by an angle θ2 that is less than angle θ1. As previously stated, the state of the contact mechanism 42 switches from one to the grounded state and the other to the other by a 90° (=θ2) rotation of the opening / closing shaft 41. That is, by the user's manual operation of rotating the operating handle 52 by 180°, the contact mechanism 42 switches from one to the grounded state and the other to the other.

[0030] As described above, in this embodiment, the contact mechanism 42 switches from a grounded state and an ungrounded state to the other state by the rotation of the opening / closing shaft 41 which is linked to the rotation of the operating shaft 51, and the rotation angle θ2 of the opening / closing shaft 41 is less than the rotation angle θ1 of the operating shaft 51. Therefore, compared to a configuration in which the operating shaft 51 and the opening / closing shaft 41 rotate at the same angle, the load required to rotate the operating shaft 51 by manual operation can be reduced. Note that angle θ1 is an example of a "first angle", and angle θ2 is an example of a "second angle".

[0031] When the grounding switch 23 is ungrounded, there is a possibility that electric charge may remain on the internal equipment 20, such as the connecting cable 21. To prevent users from coming into contact with the internal equipment 20 in the ungrounded state, the opening of the door 12 is prevented when the grounding switch 23 is ungrounded. That is, the door 12 is kept closed when the grounding switch 23 is ungrounded. On the other hand, the residual charge on the internal equipment 20 is eliminated by the transition from the ungrounded state to the grounded state, thus reducing the risk of electric shock or other dangers caused by users coming into contact with the internal equipment 20. Therefore, when the grounding switch 23 is grounded, the opening of the door 12 is permitted. When the door 12 is open, users can perform maintenance work on the internal equipment 20 (e.g., inspection or replacement) through the opening 11a. The interlocking mechanism 53 in Figure 1 is a mechanism for linking the switching of the status indicator of the grounding switch 23 (grounded state / ungrounded state) and the switching of whether the door 12 can be opened or not to the status of the grounding switch 23.

[0032] Figure 6 is a perspective view of the interlocking mechanism 53. Figures 7 and 8 are front views of the interlocking mechanism 53. Figure 7 shows the interlocking mechanism 53 when the contact mechanism 42 is ungrounded, and Figure 8 shows the interlocking mechanism 53 when the contact mechanism 42 is grounded.

[0033] As illustrated in Figures 6 to 8, the interlocking mechanism 53 comprises a display member 55, a regulating member 56, and a connecting member 57. The display member 55, the regulating member 56, and the connecting member 57 are structures formed separately from each other, for example by press-forming a metal plate, and are installed in the internal space of the housing 10.

[0034] The display member 55 is a component for displaying the status (grounded state / ungrounded state) of the grounding switch 23. The display member 55 is installed on the operating shaft 51 and includes a display unit 551 and a display unit 552. That is, each of the display unit 551 and the display unit 552 is installed on the operating shaft 51. The display unit 551 is the part that represents the grounded state. Specifically, the display unit 551 is formed with the word "On" indicating the grounded state, for example by direct printing or by attaching a printed sticker. The display unit 552 is the part that represents the ungrounded state. Specifically, the display unit 552 is formed with the word "Off" indicating the ungrounded state, for example by direct printing or by attaching a printed sticker. Note that the display unit 551 is an example of a "first display unit", and the display unit 552 is an example of a "second display unit".

[0035] The display units 551 and 552 are installed at positions radially separated from the operating shaft 51 when viewed from the axial direction (Y-axis direction) of the operating shaft 51. The distance from the operating shaft 51 to the display unit 551 is equal to the distance from the operating shaft 51 to the display unit 552. That is, the display units 551 and 552 are located on the circumference of a circle centered on the operating shaft 51. Therefore, the display units 551 and 552 move in the circumferential direction around the operating shaft 51 in conjunction with the rotation of the operating shaft 51. In other words, the display units 551 and 552 rotate by the same angle θ1 around the operating shaft 51 in conjunction with the rotation of the operating shaft 51 by the same angle θ1.

[0036] Display units 551 and 552 are located on opposite sides of the operating shaft 51 when viewed from the axial direction (Y-axis direction) of the operating shaft 51. Specifically, the angle between the imaginary line extending from the operating shaft 51 to display unit 551 and the imaginary line extending from the operating shaft 51 to display unit 552 is 180°. That is, the operating shaft 51 is located between display units 551 and 552. Therefore, the positions of display units 551 and 552 alternate in conjunction with the 180° (θ1) rotation of the operating shaft 51.

[0037] As illustrated in Figure 7, when the contact mechanism 42 is ungrounded, the display unit 552 is positioned so that it can be seen through the display window 17. Specifically, the display unit 552 is located inside the display window 17 when viewed from the direction of the Y axis. Therefore, users of the distribution board 100 can confirm that the contact mechanism 42 is ungrounded by viewing the display unit 552 through the display window 17. However, when the contact mechanism 42 is ungrounded, the display unit 551 is located behind the front part 11 of the housing 10. Therefore, users of the distribution board 100 cannot see the display unit 551.

[0038] On the other hand, when the contact mechanism 42 is in a grounded state, the display unit 551 is positioned in a location visible through the display window 17, as illustrated in Figure 8. Specifically, the display unit 551 is located inside the display window 17 when viewed from the direction of the Y axis. Therefore, users of the distribution board 100 can confirm that the contact mechanism 42 is in a grounded state by viewing the display unit 551 through the display window 17. Note that when the contact mechanism 42 is in a grounded state, the display unit 552 is located behind the front part 11 of the housing 10. Therefore, users of the distribution board 100 cannot see the display unit 552.

[0039] As described above, in this embodiment, the display unit 551 and the display unit 552 move circumferentially in conjunction with the rotation of the operating shaft 51. Therefore, it is possible to switch between displaying the grounded state by the display unit 551 (Figure 8) and displaying the ungrounded state by the display unit 552 (Figure 7) in conjunction with the rotation of the operating shaft 51. Furthermore, since the operating shaft 51 is used for both switching the state of the contact mechanism 42 (grounded state / ungrounded state) and switching the state display, the configuration of the power distribution panel 100 can be simplified compared to a configuration in which switching the state of the contact mechanism 42 and switching the state display are realized by separate mechanisms.

[0040] In this embodiment, the display units 551 and 552 rotate by 180° in conjunction with the 180° rotation of the operating shaft 51. Therefore, it is possible to alternately position each of the display units 551 and 552 at a specific position (specifically, the position of the display window 17). That is, the user can check the display unit 551, which indicates the grounded state, and the display unit 552, which indicates the ungrounded state, at the same position. Specifically, it is possible to selectively position either the display unit 551 or the display unit 552 at a position visible through the display window 17 in conjunction with the rotation of the operating shaft 51. Therefore, the user can visually confirm whether the contact mechanism 42 is in a grounded state or an ungrounded state by looking at the display window 17.

[0041] The restricting member 56 of the interlocking mechanism 53 is a plate-shaped structure for switching whether the opening / closing door 12 can be opened or not. The restricting member 56 is supported by the housing 10 by a rotation axis A parallel to the operating shaft 51 and is rotatable in the XZ plane about the rotation axis A. The connecting member 57 is a link mechanism that connects the display member 55 and the restricting member 56. Specifically, one end of the connecting member 57 is pivotally supported by the display member 55, and the other end of the connecting member 57 is pivotally supported by the restricting member 56. Therefore, when the display member 55 rotates due to the rotation of the operating shaft 51, the restricting member 56 also rotates about the rotation axis A. As described above, the restricting member 56 moves (specifically rotates) in conjunction with the rotation of the operating shaft 51.

[0042] As illustrated in Figures 7 and 8, the regulating member 56 is connected to the display member 55 (and further to the operating shaft 51) via a connecting member 57 such that the regulating member 56 rotates by 90° in conjunction with a 180° rotation of the operating shaft 51. In other words, the regulating member 56 rotates by an angle θ3 less than the angle θ1 in conjunction with a rotation of the operating shaft 51 by an angle θ1.

[0043] Specifically, the restricting member 56 rotates between a restricting position Pa and a release position Pb in conjunction with the rotation of the operating shaft 51. The restricting position Pa is the position that prevents the opening of the door 12. As illustrated in Figure 7, the restricting member 56 is in the restricting position Pa when the contact mechanism 42 is not grounded. On the other hand, the release position Pb is the position that allows the opening of the door 12. As illustrated in Figure 8, the restricting member 56 is in the release position Pb when the contact mechanism 42 is grounded. In conjunction with the rotation of the operating shaft 51 by an angle θ1 (=180°), the restricting member 56 rotates by an angle θ3 (=90°) from one of the restricting position Pa and the release position Pb to the other.

[0044] Figure 9 is an explanatory diagram of the positional relationship between the restricting member 56 and the opening / closing door 12. As illustrated in Figure 9, a locking member 121 is installed on the opening / closing door 12. The locking member 121 is a long plate-shaped structure that protrudes in the +Y direction from the inner wall surface of the opening / closing door 12 facing the +Y direction. A notch 122 is formed on the side surface of the locking member 121. As illustrated in Figures 7 and 9, when the restricting member 56 is in the restricted position Pa, a part of the restricting member 56 is located inside the notch 122 of the locking member 121. That is, the restricted position Pa is the position of the restricting member 56 when it engages with the locking member 121. As can be understood from Figure 9, when the restricting member 56 is in the restricted position Pa, the opening of the opening / closing door 12 is prevented by the engagement of the restricting member 56 and the locking member 121.

[0045] On the other hand, rotation linked to the operating shaft 51 moves the restricting member 56 to the release position Pb shown in Figure 8. When the restricting member 56 is in the release position Pb, it is located away from the locking member 121 in the +Z direction. In other words, when the restricting member 56 moves to the release position Pb, the engagement between the restricting member 56 and the locking member 121 is released. Therefore, the opening and closing door 12 can be opened and closed without being blocked by the restricting member 56. That is, when the restricting member 56 is in the release position Pb, the opening and closing door 12 is permitted to be opened.

[0046] As described above, in this embodiment, when the contact mechanism 42 is in a grounded state (i.e., a safe state in which no charge remains on the equipment 20 inside the panel), the regulating member 56 is positioned at the release position Pb, allowing the opening / closing door 12 to be opened. On the other hand, when the contact mechanism 42 is in an ungrounded state (for example, when charge remains on the equipment 20 inside the panel), the regulating member 56 is positioned at the regulating position Pa, preventing the opening / closing door 12 from being opened. Therefore, it is possible to prevent the opening / closing door 12 from being opened (and furthermore, prevent users from contacting the equipment 20 inside the panel) while charge remains on each of the equipment 20 inside the panel. In addition, the operating shaft 51 is used for both switching the state of the contact mechanism 42 (grounded state / ungrounded state) and switching whether the opening / closing door can be opened or closed. Therefore, the configuration of the power distribution panel 100 can be simplified compared to a configuration in which the switching of the state of the contact mechanism 42 and the switching of whether the opening / closing door can be opened or closed are realized by separate mechanisms.

[0047] In this embodiment, the restricting member 56 rotates in conjunction with the rotation of the operating shaft 51. Therefore, compared to a configuration in which the restricting member 56 moves in parallel in conjunction with the rotation of the operating shaft 51, the configuration for moving the restricting member 56 can be simplified. Also, the angle θ3 of the restricting member 56 is less than the angle θ1 of the operating shaft 51. Therefore, compared to a configuration in which the restricting member 56 rotates by the same angle as the operating shaft 51, the range of movement of the restricting member 56 can be reduced. As a result of the reduced range of movement of the restricting member 56, miniaturization of the power distribution panel 100 can be easily achieved.

[0048] [Opening regulation mechanism 60] As illustrated in Figure 1, an opening restriction mechanism 60 is installed inside the housing 10. The opening restriction mechanism 60 is a mechanism for switching whether or not the protective cover 15 and protective cover 16 can be removed. The opening restriction mechanism 60 switches whether or not the protective cover 15 and protective cover 16 can be removed in conjunction with the rotation of the opening / closing shaft 41 (or the rotation of the operating shaft 51) of the grounding switch 23. Specifically, when the grounding switch 23 is in an ungrounded state, the opening restriction mechanism 60 prevents the removal of the protective cover 15 and protective cover 16. On the other hand, when the grounding switch 23 is in a grounded state, the opening restriction mechanism 60 allows the removal of the protective cover 15 and protective cover 16.

[0049] As illustrated in Figure 3, multiple locking holes 71 are formed on the periphery of each of the protective cover 15 and protective cover 16. In addition, multiple locking protrusions 72 are provided on the periphery of each of the openings 14a and 14b on the rear surface 14 of the housing 10. There is a one-to-one correspondence between the multiple locking holes 71 and the multiple locking protrusions 72.

[0050] Figure 10 is an explanatory diagram of the locking hole 71 and the locking projection 72. As illustrated in Figure 10, the locking hole 71 is formed in an elongated manner in the Z-axis direction. Specifically, the locking hole 71 is a through hole (a so-called "daruma hole") formed by a combination of a small diameter portion 711 and a large diameter portion 712. The inner diameter of the small diameter portion 711 is less than the inner diameter of the large diameter portion 712. The small diameter portion 711 is located in the +Z direction relative to the large diameter portion 712.

[0051] When the protective cover 15 is fixed to the housing 10 by the fasteners B, the locking projection 72 of the housing 10 is inserted into the locking hole 71 of the protective cover 15. The locking projection 72 is a projection that includes a support column 721 and a tip portion 722. The tip portion 722 is a disc-shaped part that is formed to be larger in diameter than the support column 721. The outer diameter of the tip portion 722 is less than the inner diameter of the large diameter portion 712 and greater than the inner diameter of the small diameter portion 711. When the protective cover 15 is installed on the housing 10, the support column 721 is located inside the small diameter portion 711. In the above state, the tip portion 722 cannot pass through the small diameter portion 711, so even if all the fasteners B are removed, the protective cover 15 cannot be removed from the housing 10. On the other hand, with all fasteners B removed, when the protective cover 15 is moved in the +Z direction relative to the rear portion 14 of the housing 10, the support column 721 moves inside the large-diameter portion 712, allowing the tip portion 722 to pass through the large-diameter portion 712. Therefore, the protective cover 15 can be removed from the housing 10.

[0052] As described above, the protective cover 15 can be removed from the housing 10 by moving it in the +Z direction parallel to its plate surface. In other words, in order for a user of the distribution board 100 to remove the protective cover 15 from the housing 10, the protective cover 15 must be moved in the +Z direction. Although the above explanation has focused on the protective cover 15 for convenience, the protective cover 16 can also be removed from the housing 10 in the same way by moving it in the +Z direction parallel to its plate surface. In other words, in order for a user of the distribution board 100 to remove the protective cover 16 from the housing 10, the protective cover 16 must be moved in the +Z direction.

[0053] As described above, in this embodiment, the protective cover 15 is removed from the housing 10 by moving the protective cover 15 in the +Z direction parallel to the plate surface of the protective cover 15. Therefore, compared to a configuration in which the protective cover 15 rotates around a pivot axis (e.g., a hinge) along the edge of the protective cover 15, the space required for removing the protective cover 15 can be reduced. The same effect is achieved for the protective cover 16.

[0054] The release restriction mechanism 60 prevents the removal of the protective cover 15 by restricting its movement in the +Z direction relative to the housing 10. The release restriction mechanism 60 also prevents the removal of the protective cover 16 by restricting its movement in the +Z direction relative to the housing 10. As illustrated in Figure 1, the release restriction mechanism 60 comprises a restricting lever 61, a restricting lever 62, and a rotating disc 63.

[0055] As illustrated in Figure 5, the rotating disc 63 is a plate-shaped member installed at the end of the opening / closing shaft 41 located in the +X direction. Specifically, the rotating disc 63 is installed on the opening / closing shaft 41 such that the thickness direction of the rotating disc 63 is parallel to the axial direction of the opening / closing shaft 41. Specifically, the rotating disc 63 is fixed to a gear 43 installed at the end of the opening / closing shaft 41. Therefore, the rotating disc 63 rotates together with the opening / closing shaft 41 about a central axis along the X axis. As illustrated in Figure 1, the regulating lever 61 extends diagonally upward from the rotating disc 63 toward the protective cover 15. The regulating lever 62 extends diagonally downward from the rotating disc 63 toward the protective cover 16.

[0056] Each of the restrictor levers 61 and 62 is a long, plate-shaped member. Each of the restrictor levers 61 and 62 is installed with its thickness direction aligned with the X-axis. The base end of the restrictor lever 61 is pivotally supported on the turntable 63 at a position eccentric to the center of the opening / closing shaft 41. Similarly, the base end of the restrictor lever 62 is pivotally supported on the turntable 63 at a position eccentric to the center of the opening / closing shaft 41. Therefore, when the turntable 63 rotates together with the opening / closing shaft 41, each of the restrictor levers 61 and 62 moves. In other words, each of the restrictor levers 61 and 62 moves in conjunction with the rotation of the turntable 63.

[0057] As described above, according to this embodiment, by supporting the ends of the restricting levers 61 and 62 at positions eccentric with respect to the center of the opening / closing shaft 41 on the rotating disc 63, it is possible to move the restricting levers 61 and 62 in conjunction with the rotation of the opening / closing shaft 41. The base ends of each of the restricting levers 61 and 62 may be pivotally supported on the opening / closing shaft 41 or the gear 43. In other words, the rotating disc 63 may be omitted. Note that the restricting lever 61 is an example of a "first restricting lever," and the restricting lever 62 is an example of a "second restricting lever."

[0058] Figures 11 and 12 are cross-sectional views of the switchboard 100 focusing on the open restriction mechanism 60. Figure 11 shows the open restriction mechanism 60 when the contact mechanism 42 is ungrounded, and Figure 12 shows the open restriction mechanism 60 when the contact mechanism 42 is grounded.

[0059] As illustrated in Figures 11 and 12, the housing 10 includes a support member 73 along the Z-axis (vertical direction). The support member 73 is a support column that constitutes the housing 10. Figure 13 is a cross-sectional view of the support member 73. Figure 13 shows a cross-section of the support member 73 parallel to the XY plane near the regulating lever 61.

[0060] As illustrated in Figure 13, an insertion hole 731 is formed in the support member 73. The insertion hole 731 is a through hole that penetrates the support member 73 in the Y-axis direction and is formed to be elongated in the Z-axis direction. The regulating lever 61 is inserted into the insertion hole 731 of the support member 73. The inner wall surface of the insertion hole 731 faces the outer wall surface of the regulating lever 61 with a gap between them.

[0061] Furthermore, as illustrated in Figures 11 to 13, a guide hole 611 is formed in the restrictor lever 61. The guide hole 611 is an elongated oval through hole formed along the longitudinal direction of the restrictor lever 61. On the other hand, a guide pin 732 is installed in the housing 10. The guide pin 732 is a cylindrical member installed in the support member 73 so that its central axis is aligned with the X-axis. The guide pin 732 is inserted into the guide hole 611 of the restrictor lever 61. Therefore, the movement of the restrictor lever 61 is restricted in the longitudinal direction of the guide hole 611. In other words, the guide pin 732 installed in the housing 10 is used as a guide to restrict the movement of the restrictor lever 61. The restrictor lever 61 is held in place with the guide pin 732 inserted into the guide hole 611 by a fastener 736, such as a clip.

[0062] In the above explanation, we have focused on the restricting lever 61 for convenience, but a similar configuration is adopted for the restricting lever 62. For example, as illustrated in Figures 11 and 12, the restricting lever 62 is inserted into an insertion hole 733 formed in the support member 73. In addition, a guide hole 621 is formed in the restricting lever 62 along its longitudinal direction, and a guide pin 734 installed in the support member 73 is inserted into the guide hole 621.

[0063] As described above, the restricting levers 61 and 62 move in conjunction with the rotation of the opening / closing shaft 41 in the grounding switch 23. As illustrated in Figure 11, when the contact mechanism 42 is ungrounded, the restricting lever 61 is in the restricting position Qa1. The restricting position Qa1 is the position where the removal of the protective cover 15 is prevented by the restricting lever 61. As described above, in order to remove the protective cover 15, it is necessary to move the protective cover 15 in the +Z direction. The restricting position Qa1 is the position where the tip 612 of the restricting lever 61 interferes with the protective cover 15 when the protective cover 15 installed on the housing 10 moves in the +Z direction. Figure 11 shows the region R1 in the Y-axis direction where the protective cover 15 is located. When the restricting lever 61 is in the restricting position Qa1, the tip 612 of the restricting lever 61 protrudes into region R1. Therefore, the tip 612 of the restricting lever 61 contacts the inner wall surface of the protective cover 15, preventing the protective cover 15 from moving in the +Z direction. As described above, when the contact mechanism 42 is in an ungrounded state, the restricting lever 61 in the restricting position Qa1 prevents the removal of the protective cover 15.

[0064] Furthermore, when the contact mechanism 42 is not grounded, the restricting lever 62 is located in restricting position Qa2. Restricting position Qa2 is the position where the removal of the protective cover 16 is prevented by the restricting lever 62. As mentioned above, in order to remove the protective cover 16, it is necessary to move the protective cover 16 in the +Z direction. Restricting position Qa2 is the position where the tip 622 of the restricting lever 62 interferes with the protective cover 16 when the protective cover 16 installed on the housing 10 moves in the +Z direction. When the restricting lever 62 is in restricting position Qa2, the tip 622 of the restricting lever 62 protrudes into the region R2 where the protective cover 16 exists in the Y-axis direction. Therefore, the tip 622 of the restricting lever 62 abuts against the inner wall surface of the protective cover 16, preventing the protective cover 16 from moving in the +Z direction. As described above, when the contact mechanism 42 is in an ungrounded state, the regulating lever 62 at the regulating position Qa2 prevents the removal of the protective cover 16.

[0065] As illustrated in Figure 12, when the contact mechanism 42 is grounded, the restrictor lever 61 is in the release position Qb1. The release position Qb1 is the position in which the removal of the protective cover 15 is permitted without being prevented by the restrictor lever 61. Specifically, the release position Qb1 is the position in which the tip 612 of the restrictor lever 61 does not interfere with the protective cover 15 when the protective cover 15 installed on the housing 10 moves in the +Z direction. When the restrictor lever 61 is in the release position Qb1, the tip 612 of the restrictor lever 61 is located outside the region R1. Therefore, the protective cover 15 can move in the +Z direction without coming into contact with the tip 612 of the restrictor lever 61. As described above, when the contact mechanism 42 is grounded, the removal of the protective cover 15 is permitted when the restrictor lever 61 is in the release position Qb1.

[0066] Furthermore, when the contact mechanism 42 is grounded, the restricting lever 62 is in the release position Qb2. The release position Qb2 is the position in which the removal of the protective cover 16 is permitted without being prevented by the restricting lever 62. Specifically, the release position Qb2 is the position in which the tip 622 of the restricting lever 62 does not interfere with the protective cover 16 when the protective cover 16 installed on the housing 10 moves in the +Z direction. When the restricting lever 62 is in the release position Qb2, the tip 622 of the restricting lever 62 is located outside the region R2. Therefore, the protective cover 16 can move in the +Z direction without coming into contact with the tip 622 of the restricting lever 62. As described above, when the contact mechanism 42 is grounded, the removal of the protective cover 16 is permitted when the restricting lever 62 is in the release position Qb2.

[0067] As described above, in this embodiment, when the contact mechanism 42 is in a grounded state (i.e., a safe state), the regulating lever 61 is positioned in the release position Qb1, allowing the protective cover 15 to be removed. On the other hand, when the contact mechanism 42 is in an ungrounded state (for example, when charge remains on the equipment 20 inside the panel), the regulating lever 61 is positioned in the regulating position Qa1, preventing the removal of the protective cover 15. Therefore, it is possible to prevent the removal of the protective cover 15 (and furthermore, prevent users from contacting the equipment 20 inside the panel through the opening of the housing 10) when charge remains on the equipment 20 inside the distribution board 100. In addition, the opening / closing shaft 41 is used for both switching the state of the contact mechanism 42 (grounded / ungrounded) and switching whether the protective cover 15 can be removed or not. Therefore, the configuration of the distribution board 100 can be simplified compared to a configuration in which the switching of the state of the contact mechanism 42 and the switching of whether the protective cover 15 can be removed or not are realized by separate mechanisms. Furthermore, according to this embodiment, the same effect can be achieved with respect to the protective cover 16.

[0068] In this embodiment, in particular, since the locking projection 72 installed on the housing 10 is inserted into the locking hole 71 of the protective cover 15, the protective cover 15 needs to be moved in the +Z direction in order to remove it. Therefore, the removal of the protective cover 15 can be effectively prevented by the restricting lever 61. Also, in this embodiment, since the restricting lever 61 is inserted into the insertion hole 731 of the support member 73, unintentional movement of the restricting lever 61 (for example, swinging in the direction of the X axis) is suppressed. Therefore, the removal of the protective cover 15 can be effectively prevented by the restricting lever 61.

[0069] B: Modification The following are examples of specific modifications that may be added to each of the embodiments exemplified above. Two or more embodiments may be arbitrarily selected from the following examples and merged as appropriate, provided they do not contradict each other.

[0070] (1) In the above-described embodiment, a configuration in which the display member 55 and the regulating member 56 are connected by a connecting member 57 (link mechanism) was illustrated. However, the configuration for making the rotation angle θ3 of the regulating member 56 smaller than the rotation angle θ1 of the operating shaft 51 is not limited to the above example. For example, a configuration in which a gear installed on the display member 55 and a gear installed on the regulating member 56 are meshed together may be used to make the regulating member 56 move in conjunction with the rotation of the operating shaft 51 such that the angle θ3 is less than the angle θ1. Alternatively, the rotation angle θ3 of the regulating member 56 may be the same as the rotation angle θ1 of the operating shaft 51.

[0071] (2) In the above-described embodiment, a configuration was shown in which the regulating member 56 rotates in conjunction with the rotation of the operating shaft 51, but the manner in which the regulating member 56 moves is not limited to the above examples. For example, the regulating member 56 may move in parallel in the XZ plane in conjunction with the rotation of the operating shaft 51.

[0072] (3) In the above embodiment, a distribution board 100 having the following configuration was provided as an example. [Configuration 1] The opening / closing shaft 41 rotates by an angle θ2 (<θ1) in conjunction with the rotation of the operating shaft 51 by an angle θ1. [Configuration 2] A configuration in which the display on the display member 55 switches in conjunction with the rotation of the operating shaft 51. [Configuration 3] A configuration in which the opening and closing of the door is switched in conjunction with the rotation of the operating shaft 51. [Configuration 4] The regulating levers (61, 62) move in conjunction with the rotation of the opening / closing shaft 41 (operating shaft 51), thereby switching whether or not the protective covers (15, 16) can be removed.

[0073] One or more components selected from configurations 1 through 4 may be omitted. For example, for configuration 1, components 2 through 4 are not required and may be omitted. For configuration 2, components 1, 3, and 4 are not required and may be omitted. For configuration 3, components 1, 2, and 4 are not required and may be omitted. For example, in configuration 2 or configuration 3, the opening / closing axis 41 may rotate by the same angle as the operating axis 51.

[0074] Configurations 1 through 3 are not essential for Configuration 4 and may be omitted. For example, in Configuration 4, a configuration in which the operating shaft 51 rotates due to manual operation by the user, or a configuration in which the opening / closing shaft 41 is linked to the operating shaft 51, may be omitted. For example, in Configuration 4, a configuration in which the opening / closing shaft 41 rotates due to mechanical external force transmitted to the opening / closing shaft 41 from an external device (a configuration that does not require manual operation), or a configuration in which the operating shaft 51 is omitted, are also conceivable.

[0075] (4) The notation "the nth" (where n is a natural number) in this application is used solely as a formal and convenient label to distinguish each element in notation, and has no substantive meaning whatsoever. Therefore, there is no room for restrictive interpretation of the position or order of each element based on the notation "the nth".

[0076] C: Note From the embodiments illustrated above, for example, the following configurations can be understood. For the sake of easier understanding of each embodiment, the reference numerals in the drawings are conveniently included in parentheses below; however, the inclusion of these reference numerals does not mean that this disclosure is limited to the illustrated embodiments.

[0077] C-1: Pattern A Switchboards in which internal components such as circuit breakers or earthing switches are housed in a casing have been proposed for some time. For example, Japanese Patent Publication No. 4698741 discloses a configuration in which the open / closed state of an earthing switch (ES) can be switched by rotating an operating shaft through manual operation of an operating handle. However, in the configuration of Japanese Patent Publication No. 4698741, a large load must be applied to the operating shaft by manual operation in order to switch the open / closed state of the earthing switch. Considering these circumstances, aspect A of this disclosure aims to reduce the load required to rotate the operating shaft by manual operation.

[0078] A switchboard (100) according to one aspect of the present disclosure (Aspect A1) includes an operating shaft (51) that rotates by manual operation, an opening / closing shaft (41) that rotates by a second angle (θ2) less than the first angle (θ1) in conjunction with the rotation of the operating shaft (51), and a contact mechanism (42) that switches between a grounded state and an ungrounded state by the rotation of the opening / closing shaft (41) by the second angle (θ2). According to the above aspect, in a configuration in which the contact mechanism (42) switches from one to the other between a grounded state and an ungrounded state by the rotation of the opening / closing shaft (41) in conjunction with the rotation of the operating shaft (51), the rotation angle of the opening / closing shaft (41) (second angle (θ2)) is less than the rotation angle of the operating shaft (51) (first angle (θ1)). Therefore, compared to a configuration in which the operating shaft (51) and the opening / closing shaft (41) rotate at the same angle, the load required to rotate the operating shaft (51) by manual operation can be reduced.

[0079] In a specific example of embodiment A1 (embodiment A2), the device further includes a first display unit (551) installed on the operating shaft (51) to indicate the grounded state, and a second display unit (552) installed on the operating shaft (51) to indicate the ungrounded state, wherein the first display unit (551) and the second display unit (552) move in the circumferential direction around the operating shaft (51) in conjunction with the rotation of the operating shaft (51). According to the above embodiment, the first display unit (551) and the second display unit (552) move in the circumferential direction in conjunction with the rotation of the operating shaft (51). Therefore, it is possible to switch between the display of the grounded state by the first display unit (551) and the display of the ungrounded state by the second display unit (552) in conjunction with the rotation of the operating shaft (51). Furthermore, since the operating shaft (51) is used for both switching the state of the contact mechanism (42) (grounded state / ungrounded state) and switching the state display, the configuration of the distribution board (100) can be simplified compared to a configuration in which the switching of the state of the contact mechanism (42) and the switching of the state display are realized by separate mechanisms.

[0080] In a specific example of embodiment A2 (embodiment A3), the first display unit (551) and the second display unit (552) rotate by a first angle (θ1) about the operating shaft (51) in conjunction with the rotation of the operating shaft (51) by a first angle (θ1), and the first angle (θ1) is 180°. According to the above embodiment, the first display unit (551) and the second display unit (552) rotate by 180° in conjunction with the 180° rotation of the operating shaft (51). Therefore, it is possible to alternately position each of the first display unit (551) and the second display unit (552) at specific positions. That is, the user can check the first display unit (551) which represents the grounded state and the second display unit (552) which represents the ungrounded state at the same position.

[0081] In a specific example of embodiment A3 (embodiment A4), the device further comprises a housing (10) with a display window (17) formed therein. When the contact mechanism (42) is in the grounded state, the first display unit (551) is positioned in a location visible through the display window (17), and when the contact mechanism (42) is in the ungrounded state, the second display unit (552) is positioned in a location visible through the display window (17). According to the above embodiment, it is possible to selectively position either the first display unit (551) or the second display unit (552) in a location visible through the display window (17) in conjunction with the rotation of the operating shaft (51). Therefore, the user can visually confirm whether the contact mechanism (42) is in the grounded state or the ungrounded state by looking at the display window (17).

[0082] In any specific example of embodiments A1 to A4 (embodiment A5), the invention further comprises an openable / closable door (12) and a restricting member (56) that moves in conjunction with the rotation of the operating shaft (51), wherein the restricting member (56) is positioned in a restricting position (Pa) that prevents the opening of the door (12) when the contact mechanism (42) is in the ungrounded state, and in a release position (Pb) that allows the opening of the door (12) when the contact mechanism (42) is in the grounded state. According to the above embodiment, when the contact mechanism (42) is in the grounded state (i.e., a safe state in which no charge remains on the equipment (20) inside the panel), the restricting member (56) is positioned in the release position (Pb), making the door (12) openable. On the other hand, when the contact mechanism (42) is in an ungrounded state (for example, when charge remains on the equipment (20) inside the panel), the regulating member (56) is positioned at the regulating position (Pa), preventing the opening of the door (12). Therefore, it is possible to prevent the door (12) from being opened (and furthermore, prevent users from contacting the equipment (20) inside the panel) while charge remains on each piece of equipment (20) inside the panel. In addition, the operating shaft (51) is used for both switching the state of the contact mechanism (42) (grounded state / ungrounded state) and switching whether the door (12) can be opened or closed. Therefore, the configuration of the power distribution panel (100) can be simplified compared to a configuration in which the switching of the state of the contact mechanism (42) and the switching whether the door (12) can be opened or closed are achieved by separate mechanisms.

[0083] In a specific example of embodiment A5 (embodiment A6), the restricting member (56) rotates between the restricting position (Pa) and the release position (Pb) in conjunction with the rotation of the operating shaft (51). In the above embodiment, the restricting member (56) rotates in conjunction with the rotation of the operating shaft (51). Therefore, compared to a configuration in which the restricting member (56) moves in parallel in conjunction with the rotation of the operating shaft (51), the configuration for moving the restricting member (56) can be simplified.

[0084] In a specific example of embodiment A6 (embodiment A7), the regulating member (56) rotates by a third angle (θ3) which is less than the first angle (θ1), in conjunction with the rotation of the operating shaft (51) by the first angle (θ1). In the above embodiment, the rotation angle of the regulating member (56) (third angle (θ3)) is less than the rotation angle of the operating shaft (51) (first angle (θ1)). Therefore, compared to a configuration in which the regulating member (56) rotates by the same angle as the operating shaft (51), the range of movement of the regulating member (56) can be reduced. As a result of the reduced range of movement of the regulating member (56), miniaturization of the power distribution board (100) can be easily achieved.

[0085] C-2: Phenomenon B Switchboards in which internal equipment such as circuit breakers or grounding switches are housed in an enclosure have been proposed in the past. For example, Japanese Patent Publication No. 6946915 discloses a configuration in which a grounding switch can be operated even when the opening door is closed. If the opening door of the switchboard is opened while the grounding switch is in an ungrounded state, there is a possibility that a worker's body may come into contact with internal equipment in the switchboard that still has residual charge. Considering these circumstances, one aspect of this disclosure aims to prevent the removal of the protective cover in an ungrounded state (and furthermore, prevent users from coming into contact with internal equipment through the opening of the enclosure).

[0086] A switchboard (100) according to one aspect of the present disclosure (Aspect B1) comprises a housing (10), a rotatably installed opening / closing shaft (41), a contact mechanism (42) installed inside the housing (10) which switches between a grounded state and an ungrounded state by rotation of the opening / closing shaft (41), protective covers (15, 16) which are detachably installed on the housing (10) and which close an opening (14a) of the housing (10), and restricting levers (61, 62) which move in conjunction with the rotation of the opening / closing shaft (41), wherein the restricting levers (61, 62) are positioned in a restricting position (Qa1) which prevents the removal of the protective covers (15, 16) when the contact mechanism (42) is in the ungrounded state, and in a release position (Qb1) which allows the removal of the protective covers (15, 16) when the contact mechanism (42) is in the grounded state. In the above embodiment, when the contact mechanism (42) is in a grounded state (i.e., a safe state in which no charge remains on the equipment (20) inside the panel), the restricting levers (61, 62) are positioned in the release position (Qb1), making the protective covers (15, 16) removable. On the other hand, when the contact mechanism (42) is ungrounded (for example, when charge remains on the equipment (20) inside the panel), the restricting levers (61, 62) are positioned in the restricting position (Qa1), preventing the removal of the protective covers (15, 16). Therefore, it is possible to prevent the removal of the protective covers (15, 16) when charge remains on the equipment (20) inside the panel of the distribution board (100) (and furthermore, prevent users from contacting the equipment (20) inside the panel through the opening (14a) of the housing (10). Furthermore, the opening / closing shaft (41) is used for both switching the state of the contact mechanism (42) (grounded / ungrounded) and switching whether the protective covers (15, 16) can be removed or not. Therefore, the configuration of the distribution board (100) can be simplified compared to a configuration in which the switching of the state of the contact mechanism (42) and the switching of whether the protective covers (15, 16) can be removed or not are achieved by separate mechanisms.

[0087] In a specific example of embodiment B1 (embodiment B2), the protective cover (15,16) is removable from the housing (10) by movement in a first direction (+Z) parallel to the plate surface of the protective cover (15,16), and the restricting position (Qa1) is the position where the restricting levers (61,62) interfere with the protective cover (15,16) when the protective cover (15,16) installed on the housing (10) moves in the first direction (+Z). According to the above embodiment, the protective cover (15,16) is removed from the housing (10) by movement in a first direction (+Z) parallel to the plate surface of the protective cover (15,16). Therefore, compared to a configuration in which the protective cover (15,16) rotates around a rotation axis along the edge of the protective cover (15,16), the space required for removing the protective cover (15,16) can be reduced.

[0088] In a specific example of embodiment B2 (embodiment B3), the protective cover (15, 16) has an elongated locking hole (71) in the first direction (+Z), and a locking projection (72) installed on the housing (10) is inserted into the locking hole (71). In the above embodiment, since the locking projection (72) installed on the housing (10) is inserted into the locking hole (71) of the protective cover (15, 16), in order to remove the protective cover (15, 16), it is necessary to move the protective cover (15, 16) in the first direction (+Z). Therefore, the removal of the protective cover (15, 16) can be effectively prevented by the restricting levers (61, 62).

[0089] In any specific example of embodiments B1 to B3 (embodiment B4), the housing (10) is provided with a support member (73) oriented vertically, and the restricting levers (61, 62) are inserted into insertion holes (731) formed in the support member (73). In the above embodiment, since the restricting levers (61, 62) are inserted into the insertion holes (731) of the support member (73) constituting the housing (10), unintentional movement (e.g., swinging) of the restricting levers (61, 62) is suppressed. Therefore, the removal of the protective cover (15, 16) can be effectively prevented by the restricting levers (61, 62).

[0090] In any specific example of embodiments B1 to B4 (embodiment B5), the restricting levers (61, 62) have elongated guide holes (611) in the longitudinal direction of the restricting levers (61, 62), and guide pins (732) installed in the housing (10) are inserted into the guide holes (611). In the above embodiments, the guide pins (732) installed in the housing (10) are inserted into the guide holes (611) of the restricting levers (61, 62). Therefore, the movement of the restricting levers (61, 62) is restricted in the longitudinal direction of the guide holes (611). In other words, the guide pins (732) installed in the housing (10) can be used as guides to restrict the movement of the restricting levers (61, 62).

[0091] In any specific example of embodiments B1 to B5 (embodiment B6), a rotating disc (63) is further provided at the end of the opening / closing shaft (41), and the ends of the regulating levers (61, 62) are supported on the rotating disc (63) at a position eccentric with respect to the center of the opening / closing shaft (41). According to the above embodiments, by supporting the ends of the regulating levers (61, 62) at a position eccentric with respect to the center of the opening / closing shaft (41) on the rotating disc (63), it is possible to move the regulating levers (61, 62) in conjunction with the rotation of the opening / closing shaft (41).

[0092] In any specific example of embodiments B1 to B6 (embodiment B7), the protective covers (15, 16) include a first protective cover (15) and a second protective cover (16) installed at different positions, and the regulating levers (61, 62) include a first regulating lever (61) and a second regulating lever (62) installed at different positions. In a specific example of embodiment B7 (embodiment B8), the first restricting lever (61) is positioned in a restricting position (Qa1) that prevents the removal of the first protective cover (15) when the contact mechanism (42) is in the ungrounded state, and in a release position (Qb1) that allows the removal of the first protective cover (15) when the contact mechanism (42) is in the grounded state. The second restricting lever (62) is positioned in a restricting position (Qa2) that prevents the removal of the second protective cover (16) when the contact mechanism (42) is in the ungrounded state, and in a release position (Qb2) that allows the removal of the second protective cover (16) when the contact mechanism (42) is in the grounded state. According to the above configuration, it is possible to prevent the removal of the first protective cover (15) or the second protective cover (16) of the distribution board (100) while there is residual charge in the internal equipment (20) (and furthermore, prevent users from contacting the internal equipment (20) through the opening (14b) of the housing (10). In addition, the opening / closing shaft (41) is used for both switching the state of the contact mechanism (42) (grounded state / ungrounded state) and switching whether the first protective cover (15) or the second protective cover (16) can be removed or not. Therefore, the configuration of the distribution board (100) can be simplified compared to a configuration in which the switching of the state of the contact mechanism (42) and the switching whether the first protective cover (15) or the second protective cover (16) can be removed or not are realized by separate mechanisms.

[0093] In any specific example of embodiments B1 to B8 (embodiment B9), an operating shaft (51) that rotates by manual operation is further provided, and the opening / closing shaft (41) rotates in conjunction with the rotation of the operating shaft (51). In the above embodiments, the contact mechanism (42) can be switched from one to the other between a grounded state and an ungrounded state by rotating the opening / closing shaft (41) by manually operating the operating shaft (51). Furthermore, the operating shaft (51) is used for both switching the state of the contact mechanism (42) (grounded state / ungrounded state) and switching whether the protective covers (15,16) can be removed or not. Therefore, the configuration of the distribution board (100) can be simplified compared to a configuration in which the switching of the state of the contact mechanism (42) and the switching of whether the protective covers (15,16) can be removed or not are realized by separate mechanisms.

[0094] In a specific example of embodiment B9 (embodiment B10), the opening / closing shaft (41) rotates by a second angle (θ2) which is less than the first angle (θ1), in conjunction with the rotation of the operating shaft (51) by a first angle (θ1). According to the above embodiment, the rotation angle of the opening / closing shaft (41) (second angle (θ2)) is less than the rotation angle of the operating shaft (51) (first angle (θ1)). Therefore, compared to a configuration in which the operating shaft (51) and the opening / closing shaft (41) rotate at the same angle, the load required to rotate the operating shaft (51) by manual operation can be reduced.

[0095] In a specific example of embodiment B9 or embodiment B10 (embodiment B11), the device further includes a first display unit (551) installed on the operating shaft (51) to indicate the grounded state, and a second display unit (552) installed on the operating shaft (51) to indicate the ungrounded state, wherein the first display unit (551) and the second display unit (552) move in a circumferential direction around the operating shaft (51) in conjunction with the rotation of the operating shaft (51). According to the above embodiment, the first display unit (551) and the second display unit (552) move in a circumferential direction in conjunction with the rotation of the operating shaft (51). Therefore, it is possible to switch between the display of the grounded state by the first display unit (551) and the display of the ungrounded state by the second display unit (552) in conjunction with the rotation of the operating shaft (51). Furthermore, since the operating shaft (51) is used for switching the state of the contact mechanism (42) (grounded / ungrounded), switching the state indicator, and switching whether the protective covers (15, 16) can be removed or not, the configuration of the distribution board (100) can be simplified compared to a configuration in which the switching of the state of the contact mechanism (42), the switching of the state indicator, and the switching of whether the protective covers (15, 16) can be removed or not are realized by separate mechanisms.

[0096] In any specific example of embodiments B9 to B11 (embodiment B12), the housing (10) further comprises an openable / closable door (12) installed on the housing (10) and a restricting member (56) that moves in conjunction with the rotation of the operating shaft (51), wherein the restricting member (56) is positioned in a restricting position (Pa) that prevents the opening of the openable / closable door (12) when the contact mechanism (42) is in the ungrounded state, and in a release position (Pb) that allows the opening of the openable / closable door (12) when the contact mechanism (42) is in the grounded state. According to the above embodiments, when the contact mechanism (42) is in the grounded state (i.e., in a safe state), the restricting levers (61, 62) are positioned in the release position (Qb1), making the protective covers (15, 16) removable, and the restricting member (56) is positioned in the release position (Pb), making the openable / closable door (12) open. On the other hand, when the contact mechanism (42) is in an ungrounded state (for example, when charge remains on the equipment (20) inside the panel), the regulating levers (61, 62) are positioned in the regulating position (Qa1) to prevent the removal of the protective covers (15, 16), and the regulating member (56) is positioned in the regulating position (Pa) to prevent the opening of the opening / closing door (12). Therefore, it is possible to prevent the protective covers (15, 16) and the opening / closing door (12) from being opened (and furthermore, prevent users from contacting the equipment (20) inside the panel) while charge remains on each piece of equipment (20) inside the panel. In addition, the operating shaft (51) is used for switching the state of the contact mechanism (42) (grounded / ungrounded), switching whether the protective covers (15, 16) can be removed, and switching whether the opening / closing door (12) can be opened or closed. Therefore, compared to a configuration in which the switching of the state of the contact mechanism (42), the switching of whether the protective covers (15, 16) can be removed or not, and the switching of whether the opening / closing door (12) can be opened or not are achieved by separate mechanisms, the configuration of the distribution board (100) can be simplified. [Explanation of Symbols]

[0097] 100…Distribution panel, 10…Housing, 11…Front section, 12…Opening / closing door, 121…Locking member, 122…Notch, 13…Opening / closing door, 14…Rear section, 15…Protective cover, 151…Handle, 16…Protective cover, 161…Handle, 17…Display window, 18…Shaft hole, 20…Internal equipment, 21…Connecting cable, 22…Instrument current transformer, 23…Grounding switch, 25…Lightning arrester, 26…Instrument transformer, 27…Main circuit bus, 29…Circuit breaker, 31…Wiring room, 32…Bus room, 33…Circuit breaker room, 41…Opening / closing shaft, 42…Contact mechanism, 43…Gear, 44…Movable contact, 45…Fixed 50...Constant contact, 51...Operating mechanism, 52...Operating shaft, 53...Interlocking mechanism, 54...Gear, 55...Display member, 551...Display unit, 552...Display unit, 56...Restricting member, 57...Connecting member, 60...Opening restricting mechanism, 61...Restricting lever, 611...Guide hole, 612...Tip, 62...Restricting lever, 621...Guide hole, 622...Tip, 63...Rotating disc, 71...Locking hole, 711...Small diameter part, 712...Large diameter part, 72...Locking projection, 721...Support column, 722...Tip, 73...Support member, 731, 733...Insertion hole, 732, 734...Guide pin.

Claims

1. A rotating shaft operated by manual operation, An opening / closing shaft that rotates by a second angle less than the first angle in conjunction with the rotation of the operating shaft by a first angle, A contact mechanism in which a grounded state and an ungrounded state are switched by the rotation of the opening / closing shaft by the second angle, A distribution board equipped with the following features.

2. A first display unit is installed on the operating shaft to indicate the grounding state, A second display unit is installed on the aforementioned operating shaft to indicate the ungrounded state. Furthermore, The first and second display units move in a circumferential direction around the operating shaft in conjunction with the rotation of the operating shaft. A power distribution panel according to claim 1.

3. The first display unit and the second display unit rotate by a first angle around the operating shaft in conjunction with the rotation of the operating shaft by a first angle. The first angle is 180°. The power distribution panel according to claim 2.

4. The enclosure further includes a display window, When the contact mechanism is in the grounded state, the first display unit is positioned in a location visible through the display window. When the contact mechanism is in the ungrounded state, the second display unit is positioned in a location visible through the display window. A power distribution panel according to claim 3.

5. A door that can be opened and closed, A restricting member that moves in conjunction with the rotation of the aforementioned operating shaft and Furthermore, The aforementioned restraining member is When the contact mechanism is in the ungrounded state, it is positioned in a restricting position that prevents the opening of the door. When the contact mechanism is in the grounded state, it is positioned in the release position that allows the opening of the door. A power distribution panel according to claim 1.

6. The restricting member rotates between the restricting position and the release position in conjunction with the rotation of the operating shaft. A power distribution panel according to claim 5.

7. The regulating member rotates by a third angle less than the first angle in conjunction with the rotation of the operating shaft by the first angle. A power distribution panel according to claim 6.

Images