JPH04121306U - Switchboard door locking device - Google Patents

Abstract

(57) [Summary] [Purpose] Interlock the door and input power circuit breaker of only one switchboard in a switchboard configured in rows, and other switchboards draw power from that input power circuit breaker. The purpose is to improve the safety of maintenance and inspection of each switchboard and to reduce the number of parts. [Structure] The door 4 of the main switchboard 1 is interlocked with the input power supply circuit breaker and is opened only when this circuit breaker is cut off, and the door 14 of the second switchboard 2 is interlocked with the input power circuit breaker. The lock device 16 inside the door 14 is unlocked and opened by pushing a push rod 6 provided inside the door 14.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a door locking device for a power distribution board in which one control unit is arranged in a row.

0002

[Conventional technology]

In recent years, where manufacturer responsibility has been pursued, safety requirements have become stricter. Even on the low-voltage switchboard, the door cannot be opened when the power line is live. Door locking devices have come to be installed to allow this.

0003 Figure 4 shows a so-called one control unit drawn from the same power source with three planes of 1A, 2A, and 3A. This is a front view of a row-by-panel configuration consisting of a switchboard, with a single-line connection diagram to explain the functions. It is depicted lying down. The switchboard 1A is equipped with an input power supply circuit breaker MCCB1, and other Power is drawn into the switchboards 2A and 3A via this input power circuit breaker MCCB1. In rare cases, it is connected to the branch circuit breakers 51, 52, 53 and the branch circuit electromagnetic switch 54. It is continued.

0004 In addition, H in the figure is a handle for opening/closing operation provided on the door of each switchboard.

[0005] The doors of switchboards 1A to 3A described above are all connected to the input power supply circuit breaker MCCB1. It is configured so that it can be opened and closed independently regardless of the on/off state. follow If the input power circuit breaker MCCB1 is turned on, open the door or close the door. If the input power supply circuit breaker MCCB1 is turned on while the It is dangerous as there is a possibility of touching it.

[0006] Figure 5 shows the commercially available parts for each board to prevent the risk of people coming into contact with exposed live parts. External handle with mechanical locking mechanism between the power distribution board case and door.For MH operated input power supply. Circuit breakers MCCB1 to MCCB3 are installed, and the switchboards are 1a, 2a, and 3a. It is. Input power supply circuit breakers MCCB1 to MCCB3 provided for each distribution board All of these can be turned on by operating the external handle only when the switchboard door is closed. Either one of the input power supply circuit breakers MCCB1 to MCCB3 can When the circuit breaker MCCB is on, close the door of the switchboard where the circuit breaker MCCB is installed. If the door cannot be opened and the door is open, Since the installed input power supply circuit breaker MCCB cannot be closed, exposure This solves the safety problem of people coming into contact with live parts.

[0007]

[Problem that the idea aims to solve]

By adopting the switchboard shown in Figure 5 described above, it is possible for people to come into contact with exposed live parts. Although this solves the safety problem of The external handle MH operated circuit breaker MCCB with locking mechanism is installed as the input power supply MCCB. This makes the switchboard expensive and reduces competitiveness in the market. Not only does it require a large amount of installation space, but it also requires a large amount of installation space.

[0008] This invention was developed in view of the above points, and it reduces the number of parts used and has a simple structure. The aim is to economically ensure the safety of switchboards using an inexpensive switchboard door locking device. It has been the target.

[0009]

[Means to solve the problem]

The means to solve the above problems in this invention is to install an input power supply circuit breaker for power distribution. The circuit breaker was shut off by performing the closing and shutting operations using the operating handle provided on the outside of the panel. The front panel consists of a main switchboard and a row of panels that can only open the door when Consists of a distribution board that draws in power from the input power supply circuit breaker, and these boards are adjacent to each other. A through hole is provided in the side wall of the adjacent casing of the switchboard to communicate with each other, and inside one of the casings A push rod is provided that is slidable and can freely move in and out of the through hole, and another adjacent housing. The door is equipped with a locking device having a release lever, and the push rod is used to lock the release lever. Open the doors in sequence from the main switchboard so that this locking device unlocks when is pressed. to unlock the door of the adjacent power distribution board before opening it.

0010 In addition, the input power circuit breaker can be turned on and off using the operation handle provided on the outside of the switchboard. A main switchboard whose door can only be opened when the circuit breaker is shut off. and a power distribution board that is configured in parallel with the main power distribution board and draws in power from the input power supply circuit breaker. In the door locking device of a switchboard consisting of There are through holes in the side walls of the side casings that communicate with each other, and it can be slid to the front side of one of the casings. A rod with a cam that can freely come out and retract is arranged in the through hole, and a rod with a cam that can be freely retracted is installed in the through hole side of the other adjacent housing. A cam operating rod that moves in contact with the tip of the cam-equipped rod is provided, and , the cam-equipped rod is supported by a cam case provided on the front side of the one housing. The integral cam, which is always urged toward the adjacent housing by a spring, protrudes from the door side. The cam operating rod is supported by a case provided on the front side of the other housing. and an operating rod supported in this case in a direction perpendicular to the cam operating rod. The cam operating rod is pressed by the cam-equipped rod. When the operation rod is opened, the operating rod is projected toward the door, and the door of one of the switchboards is When the door is closed, the cam is prevented from moving, and when the door opens, the cam-equipped rod is adjacent to the cam. A protrusion is provided that the tip of the cam comes into contact with when moving to the switchboard side, and the door of the row panel is closed. Make sure that the input power circuit breaker on the main switchboard cannot be turned on unless everything is closed.

[0011]

[Effect]

For switchboards with side-by-side configuration, open the door after shutting off the input power circuit breaker on the main switchboard. Unlock the door of the adjacent second switchboard from inside and move the door adjacent to this second switchboard. To lock the door of the third switchboard, open the door of the second switchboard and unlock it from inside. subordinate The door of each switchboard can only be opened when the input power circuit breaker is shut off. Extremely safe for maintenance and inspection.

0012 In other embodiments, when the door of the adjacent switchboard is open, the main The tip of the cam-equipped rod on the power panel side moves into the adjacent power distribution panel, and at this time, the cam-equipped rod The main switchboard door cannot be closed because the tip of the cam touches the protruding part of the door. stomach. When the adjacent switchboard door closes and the cam rod moves to its original position, the cam The tip disengages from the protrusion of the door, allowing the door to close. Therefore, adjacent power distribution The main switchboard door cannot be closed unless the panel door is closed, so the main switchboard door cannot be closed. Since the power supply circuit breaker cannot be closed, it is extremely safe for maintenance and inspection.

[0013]

【Example】

This invention is a power distribution system with a side-by-side arrangement that draws in power from the same input power source and supplies power. In the panel, an input power circuit breaker is installed on any one switchboard (hereinafter referred to as the main switchboard). A circuit breaker is installed so that the door can only be opened when this circuit breaker is disconnected. and connect it to another switchboard adjacent to this main switchboard (hereinafter referred to as the second switchboard). does not have a circuit breaker for the input power supply, and only when the main switchboard door is opened (input The power circuit breaker can be opened (in the cut-off state) to ensure safety during maintenance and inspections and to protect parts. This is an attempt at abbreviation.

[0014] Figure 1 is a cross-sectional view of the main parts of an embodiment of the present invention, and (A) in the same figure shows the door of the main switchboard closed. The same figure (B) shows the opened state. In these figures, 1 and 2 are husbands. each main switchboard and second switchboard, these main switchboard 1 and second switchboard 2 are They have casings 3 and 13 and doors 4 and 14, respectively, and the front surfaces of the doors touch each other in a straight line. They are arranged to form a row board. 5 and 15 are opposite side walls of the casings 3 and 13 The mounting member for attaching the push rod 6 and push rod 7 provided in the figure is shown. pushlo The pad 6 is attached to the mounting member 5, is slidable on the bearing 8, and is prevented from coming off by a retaining pin. The push rod 7 is attached to a mounting bracket 9 attached to the mounting member 15. The push rod 6 and the push rod 7 are provided so as to be slidable and prevented from coming off. One end is in a straight line so that it can be seen through the through hole 10 provided in the side wall where the casings 3 and 13 are in contact with each other. It is located in 16 is a locking device (snatch lock) having a release lever 17 At this time, the receiver 19 and the chain attached to the receiver mounting base 18 provided on the door 14 of the second switchboard 2 are connected. be locked. This locking is automatically performed when the door 14 is completely closed. release lever 17 is provided on the other end side of the push rod 7 and pushes the push rod 6 to the right side in the figure. When the release lever 17 is pushed via the push rod 7, the release lever 17 is moved as shown in FIG. 1(B). Then, the snatch lock between the engaging claw 20 and the receiver 19 is released. this pussy The switch rod 6 cannot be operated unless the door 4 of the main switchboard 1 is opened; cannot be opened unless the input power supply circuit breaker MCCB1 in Figure 3 is shut off. When opening the door 14 of the power distribution board 2, the power is always turned off. subordinate Therefore, each switchboard can be maintained and inspected in a safe condition at all times. Figure 2 shows another example of this invention. This is a cross-sectional view of the main parts showing an example. The input power circuit breaker cannot be turned on unless the breaker is closed.

[0015] Figure 2 (A) shows a state in which the doors of the main switchboard 1 and the second switchboard 2 are closed; (B) shows a state in which both doors can be opened. In addition, if there is a machine with the same name or similar to that in Figure 1, Functional parts are given the same reference numerals and explanations are omitted.

[0016] In these figures, 27 is a case fixed to the housing 13, and 28 is a case 27. The operating rod is in contact with a receiver 29 fixed to the door 14 provided through the When the door 14 is opened and closed, it appears at the front and rear of the case 27. 30 is the process of the operating rod 28 This is a restriction snap ring. 31 is provided through the case 27 and is connected to the case 2. The cam operating rod is biased by a spring 32 stretched between the case 27 and the cam operating rod. The operating rod is operated via a bell crank 34 that rotates around a shaft 33 fixed to the 28. The cam operation section 35 is configured by 27 to 34 described above. ing.

[0017] 36 is a protrusion fixed to the door 4 of the main switchboard, 37 is a cam protruding from the door 4 side, It reciprocates within the cam case 38 fixed to the housing 3, contacts the protrusion 36, and closes the door 4. prevent the closure of 39 is a rod with a cam to which the cam 37 is attached, and the boundary surface 4 between the plates If the cam operating rod 31 is in contact with the It is operated against the tension of the spring 41. The cam part 42 is connected by 36 to 41 described above. It consists of

[0018] Next, to explain the operation, when the door 14 of the second switchboard 2 is open, the 2(B), the operating rod 28 can protrude forward, so the bell The cam operating rod 31 connected by the crank 34 is moved by the spring 32 as shown in the figure. The cam-equipped rod is pulled by the spring 41 because it is pulled to the right and moves. 39 and cam 37 also move to the right inside the cam case 38. Therefore, try to close door 4 Then, the protrusion 36 fixed to the door 4 hits the protrusion of the cam 37 and can be closed. I can't.

[0019] When the door 14 is closed, the operating rod 28 is held by a receiver 29 fixed to the door 14. The cam operating rod 31 is pushed into the spring 3 through the bell crank 34. With a cam pushed out to the left in the figure against the tension of 2 and pulled by a spring 41. Since the rod 39 is pushed, the cam 37 moves to the left inside the cam case 38 and is fixed to the door 4. The protrusion 36 that has been removed no longer touches the protrusion of the cam 37, and as shown in FIG. 1(A), Door 4 can be closed. The input power supply circuit breaker for the main switchboard 1 is shown in Figure 3. This is done using an external handle MH with a mechanical locking mechanism, and power distribution other than the main switchboard After closing the door, the panel must be unlocked from inside the adjacent switchboard as shown in Figure 1. The configuration is such that it cannot be opened. The locking device in this case does not necessarily have to be the one shown in Figure 1. There is no need to manually unlock the door from inside the panel.

[0020] Figure 3 is a front view of a power distribution board showing an application example of the door locking device according to the present invention. Single-wire connections are overlaid to illustrate functionality. In addition, the same parts as Figures 4 and 5 are given the same reference numerals and their explanations will be omitted.

[0021] Figure 3 (A) shows the main switchboard 1b, where the input power supply circuit breaker MCCB1 is installed, at the left end. A total of three switchboards, including other switchboards 2b and 3b, constitute one control unit. Ru. A door consisting of a cam part 42 and a cam operating part 35 is located at the top of the adjacent joint of each switchboard. A locking device was provided, and a door locking device shown in Figure 1 was provided near the center of the joint. It shows the case. Components with the same names as those in Figures 1 and 2 are given the same reference numerals. Ru. If the door of the switchboard 3b is not closed by the door locking device on the top, the door of the switchboard 2b will not be closed. The door of switchboard 1b cannot be closed unless the door of switchboard 2b is closed. In addition, the input power supply circuit breaker MCCB1 is connected to the switchboard 1b. It cannot be loaded unless the door is closed.

[0022] In addition, when opening the door, turn off the input power circuit breaker MCCB1 and then close the power distribution board. If the door 1b is opened and the locking device 16 of the adjacent switchboard 2b is not released, the switchboard 2 If door b cannot be opened, the chain will be locked unless the door of switchboard 2b is opened and the release mechanism is operated. The door of the switchboard 3b cannot be opened by unlocking the door.

[0023] Figure 3(B) shows the switchboard 2 located in the center of the three-sided switchboard that constitutes one control unit. This is an example where an input power supply circuit breaker MCCB1 is provided at c. of each switchboard The door locking device provided at the top of the joint part is connected to the two cam parts provided on the power distribution board 2c. It is operated by the operation parts provided on the switchboards 1c and 3c adjacent to both sides of 2c. Also, a locking device 16 is installed near the center of the joint of each switchboard. Both are provided so that they can be released by opening the door of the switchboard 2c.

[0024] Therefore, as in Figure 3 (A), the input power cannot be turned on unless the door is closed. Switchboards 1c and 3 adjacent to both sides of the main switchboard 2c where the circuit breaker MCCB1 is installed Unless the door c is closed, the door of the switchboard 2c cannot be closed, and Shuts off input power circuit breaker MCCB1, which cannot be shut off unless the door is closed. If you do not open the door of switchboard 2c and operate the release mechanism, you will be able to unlock it and move the doors on both sides. The doors of switchboards 1c and 3c that are in contact cannot be opened.

[0025] In this way, all the units that make up one control unit share the input power supply circuit breaker. If not after closing the switchboard door, turn on the input power circuit breaker MCCB1. In addition, the door of any panel must be disconnected from the input power supply circuit breaker MCCB1. This must be done after opening the door of the power distribution board where the input power supply circuit breaker MCCB1 is installed. Because the battery cannot be opened, there is a risk of electric shock if a person comes into contact with the exposed live parts. Accidents are completely preventable.

[0026] In addition, in the above explanation, the power supply for input power to multiple power distribution boards that constitute one control unit is used. Mechanical locking mechanism used as a circuit breaker between the casing and door of an expensive commercially available switchboard We have described the case where a molded rotary circuit breaker with external handle operation is used, but this A circuit breaker will not close or shut off unless the door of the switchboard where the circuit breaker is installed is closed. Any type of circuit breaker may be used as long as it is disabled. .

[0027] In addition, although the application example is described for a row of three-sided boards, in the case of a row of boards with multiple sides. Also, it can be applied no matter where the input power panel is located in a row of multiple panels. can.

[0028]

[Effect of the idea]

The door locking device for a power distribution board according to the present invention has a simple mechanism as described above. If the door of another adjacent switchboard is not closed, the door of that switchboard cannot be closed. Do not open the door of the switchboard before opening other adjacent switchboards. Since the door of the control unit cannot be opened, it is impossible to open the door of the unit. The input power panel in the row panel consisting of the front panel switchboard is connected only when the door is closed. When adopting a circuit breaker that can disconnect or a switch that can open and close, , if the door is left open because you forgot to close it, or if a person comes into contact with the exposed live parts after opening the door. Accidents such as electric shock can be completely prevented.

[0029] In addition, the door locking device of the switchboard according to the present invention is separated at the interface between the switchboards. For example, it is easy to handle the switchboard by dividing it into individual panels, making it easier to adjust connections after installation, etc. It has various practical effects, such as eliminating the need for any troublesome work.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, in which (A) shows a state in which the door is closed, and (B) shows a state in which the door is opened.

FIG. 2 is a sectional view of a main part of another embodiment of the present invention, in which (A) shows a state in which the door is prevented from closing, and (B) shows a state in which the door is unlocked.

[Fig. 3] A front view of a power distribution board showing an example of application of the present invention.
(A) shows an example of application of the present invention, and (B) shows another example of application of the present invention.

[Figure 4] Front view of conventional power distribution board

[Figure 5] Front view of another conventional switchboard that is an improved version of the switchboard shown in Figure 4.

[Explanation of symbols]

1...Main switchboard 2...Second switchboard 3, 13...Housing 4,14...door 5, 15...Mounting member 6...Push rod 7...Push stick 9...Mounting bracket 10...Through hole 16...Lock device 17...Release lever 18... Receiver mounting stand 19...Receiving money 27...Case 28...Operation rod 30...Snap ring 31...Cam operating rod 32, 41...Spring 33...axis 34...bell crank 35...Cam operation section 36...Protruding part 37...cam 38...Cam case 39...Rod with cam 40...Boundary surface between switchboards 42...Cam part MCCB…Input power supply circuit breaker

Claims (2)

[Scope of utility model registration request] [Claim 1] A main switchboard in which an input power supply circuit breaker is turned on and off using an operating handle provided on the outside of the switchboard, and a door can be opened only when the circuit breaker is cut off, and the main switchboard. The switchboards are arranged in rows and draw power from the input power circuit breaker, and the side walls of the adjacent casings of the switchboards adjacent to each other in the rows of boards are provided with through holes that communicate with each other, and the holes in one of the casings are provided with through holes that communicate with each other. A locking device is provided on the door of another adjacent casing, and a locking device having a release lever is provided on the door of another adjacent housing, and when the release lever is pressed with the pushrod, A door locking device for a power distribution board, characterized in that the locking device unlocks the door. [Claim 2] A main switchboard in which an input power circuit breaker can be turned on and off using an operating handle provided on the outside of the switchboard, and a door can be opened only when the circuit breaker is cut off; and the main switchboard. In a door locking device for a power distribution board comprising a power distribution board which is arranged in a row and draws power from the input power circuit breaker, through holes communicating with each other are formed in the side walls of adjacent casings of the power distribution boards adjacent to each other in the row of panels. A cam-equipped rod is provided on the front side of one of the casings and is slidable and retractable into the through-hole, and a cam-equipped rod that abuts the tip of the cam-equipped rod is disposed on the through-hole side of the other adjacent casing. The cam operating rod is supported by a cam case provided on the front side of one of the casings, is always urged toward the adjacent casing by a spring, and is integrated with the cam operating rod. The cam has a cam that protrudes from the door side, and the cam operating rod is supported by a case provided on the front side of the other housing, and is supported by the case in a direction perpendicular to the cam operating rod. The cam operating rod is connected to an operating rod with a bell crank, and when the cam operating rod is pressed by the cam-equipped rod, the operating rod projects toward the door, and the door of one of the switchboards is connected to the door when the door is closed. A door locking device for a power distribution board, characterized in that the door locking device for a power distribution board is provided with a protruding portion that prevents the movement of the cam in the state and is brought into contact with the tip of the cam when the door is opened and the rod with the cam moves toward the adjacent power distribution board.