JP7492937B2 - switchboard - Google Patents

Description

The present invention relates to a switchboard used as a power distribution facility in, for example, a factory or building.

Distribution boards used as power receiving and distribution equipment in factories, buildings, etc. are generally configured as shown in FIG. 1. In FIG. 1, distribution board 10 includes housing 11 made of metal plate and door 12 that closes the opening of housing 11. Inside housing 11, monitoring and control devices (instruments, switches, relays, etc.) and main circuit devices (breakers, disconnectors, load switches, transformers, etc.) are stored. Also, in FIG. 1, monitoring sensors 13, monitoring lights 14, and monitoring cameras 15 are fixed to the inner wall of housing 11. Inside the interior space of housing 11, transformer 15 and power distribution section 16 are stored, and these are connected by lead-in wires 17 and wiring 18.

Such a switchboard 10 is shown, for example, in JP 2000-139006 A (Patent Document 1). In this Patent Document 1, a ventilation air flow path is formed by a lower intake hole equipped with a dust filter and louvers at the bottom of the switchboard body, an upper exhaust hole that is a hole opened in the front of the eaves protruding forward from the roof of the switchboard and covered with a louver, and a middle ventilation hole equipped with a dust filter at the partition between the ceiling and roof of the switchboard body, and a shielding plate with a U-shaped cross section and ventilation holes on the top and bottom faces is attached to protrude in front of the upper exhaust hole.

This configuration reliably prevents rainwater from entering the outdoor enclosed switchboard when heat generated inside the panel is removed by natural ventilation, and the flow of cooling air is not impeded even when it snows, and the interior can be easily inspected even in rainy weather.

JP 2000-139006 A

However, with regard to such switchboards, there is a demand for monitoring the inside of the switchboard in order to reduce the labor required for maintenance and management. To monitor the inside of the board, mounting fixtures such as surveillance cameras, surveillance sensors, and lighting for the surveillance cameras, as well as wiring to electrically connect these, are required.

Furthermore, these monitoring devices are not only installed when new switchboards are manufactured, but are also sometimes requested to be added to existing switchboards that have already been delivered. To install the monitoring devices, if it is a new switchboard, new dedicated mounting holes must be drilled, and if it is an existing switchboard, new mounting holes must be drilled as necessary in addition to the existing mounting holes.

In addition, there are live parts such as transformers inside the switchboard, and if the monitoring equipment or wiring were to fall, it could cause a ground fault or short circuit, which could lead to a power outage, so the monitoring equipment needs to be secured in place to prevent it from falling.

As such, when installing new monitoring equipment inside a housing, it takes a lot of time for the reasons mentioned above. In particular, with existing switchboards, it is necessary to temporarily shut down the switchboard in order to install new monitoring equipment inside the housing, which requires the work to be done in a short time.

The main objective of the present invention is to solve at least one of the above problems and provide a switchboard equipped with a monitoring device fixing device that can easily install monitoring devices for monitoring the inside of the switchboard in a short time.

The present invention is characterized by storing a permanent magnet in a fixed base on which a monitoring device is mounted, and by bringing this permanent magnet into close contact with a housing made of a magnetic metal of a switchboard, the fixed base on which the monitoring device is mounted is magnetically fixed to the housing.

According to the present invention, a permanent magnet is fixed to the fixed base on which the monitoring device is mounted, so that it can be easily attached to the switchboard housing at any position in a short time.

1 is a cross-sectional view showing a configuration of a switchboard to which the present invention is applied. 1 is a side view of a surveillance device fixing device according to a first embodiment of the present invention; FIG. 2B is a top view of the surveillance device fixing device shown in FIG. 2A. FIG. 2 is an explanatory diagram showing the state in which the surveillance device fixing device is attached to the wall surface of the housing of the switchboard. FIG. 11 is a side view of a surveillance device fixing device according to a second embodiment of the present invention; FIG. 3B is a top view of the surveillance device fixing device shown in FIG. 3A. 11 is a cross-sectional view showing a cross section of a fixing base forming a surveillance equipment fixing device according to a third embodiment of the present invention. FIG. 11 is a cross-sectional view showing a cross section of a modified example of a fixing base forming a surveillance equipment fixing device. FIG. 13 is a cross-sectional view showing a cross section of a fixing base and a fixing portion of a surveillance device fixing part which form a surveillance device fixing device according to a fourth embodiment of the present invention; FIG. 13 is a cross-sectional view showing a cross section of a modified example of the fixing portion of the fixing base and the surveillance equipment fixing part that form the surveillance equipment fixing device. FIG. FIG. 13 is an explanatory diagram showing an attachment state of a surveillance equipment fixing device and a housing according to a fifth embodiment of the present invention. FIG. 9 is a cross-sectional view showing a cross section of the surveillance device fixing device shown in FIG. 8 . 9 is a cross-sectional view showing a cross section of a modified example of the surveillance device fixing device shown in FIG. 8 . FIG. 13 is an explanatory diagram showing the mounting state of a surveillance equipment fixing device and a housing according to a sixth embodiment of the present invention. FIG. 13 is an explanatory diagram showing the mounting state of a surveillance equipment fixing device and a housing according to a seventh embodiment of the present invention. FIG. 13 is an explanatory diagram showing the mounting state of a surveillance equipment fixing device and a housing according to an eighth embodiment of the present invention. FIG. 14 is an exploded view of the wire winding mechanism shown in FIG. 13 . 15 is a cross-sectional view illustrating an operating state of the winding mechanism of the surveillance equipment fixing device shown in FIG. 14.

The following describes in detail an embodiment of the present invention with reference to the drawings. However, the present invention is not limited to the following embodiment, and the scope of the present invention includes various modifications and applications within the technical concept of the present invention.

In FIG. 1, the switchboard 10, which may be placed outdoors, has a housing 11 made of magnetic metal and an opening/closing door 12 that closes the opening of the housing 11. Inside the housing 11, as described above, are housed monitoring and control devices consisting of meters, switches, relays, etc., and main circuit devices consisting of circuit breakers, disconnectors, load switches, transformers, etc. All or part of these function as power receiving and distribution equipment.

In addition, a surveillance sensor 13, surveillance lighting 14, and surveillance camera 15 are fixed to the inner wall of the housing 11, and function as surveillance equipment. However, surveillance equipment is not limited to these and also includes other surveillance sensors, etc. Furthermore, a transformer 15 and a power distribution unit 16 are housed in the internal space of the housing 11, and these are connected by a lead-in line 17 and wiring 18.

Next, the surveillance device fixing device of this embodiment will be described for such a distribution board 10. Figures 2A and 2B show the side and top of the surveillance device fixing device 20 of this embodiment, and Figure 2C shows the surveillance device fixing device 20 fixed to the housing 11 of the distribution board 10.

In Figures 2A and 2B, a mounting portion 23 for mounting a monitoring device 22 (here, a temperature sensor) is provided on one side of a fixed base 21 in the form of a rectangular flat plate made of metal or synthetic resin. The fixed base 21 and the mounting portion 23 are formed integrally, or are integrated by fixing screws, fixing rivets, or the like. In this embodiment, the mounting portion 23 is formed in a concave shape and the monitoring device 22 is stored inside, but the shape of the mounting portion 23 is not limited to this, and it is sufficient that the configuration allows the monitoring device 22 to be attached.

On the other side of the fixed base 21, two fixed pedestals 25, each housing a permanent magnet 24, are provided in the longitudinal direction of the rectangular fixed base 21. The fixed base 21 and the fixed pedestal 25 are either integrally formed or integrated with fixing screws, fixing rivets, or the like. The fixed pedestal 25 is annular and houses a circular permanent magnet 24 inside, which is firmly fixed to the housing of the fixed pedestal 25 with a synthetic adhesive.

The fixed base 20, surveillance equipment 21, mounting portion 22, permanent magnet 23, and fixed base 24 are therefore integrated together to form the surveillance equipment fixing device 20. As shown in FIG. 2C, the surveillance equipment fixing device 20 is fixed by an operator to any predetermined position on the wall surface of the housing 11 of the switchboard 10 by the magnetic force of the permanent magnet 23. It goes without saying that the permanent magnet 23 has a magnetic force capable of holding the surveillance equipment fixing device 20 in a fixed position.

In this way, the monitoring equipment fixing device 20 is fixed to any predetermined position on the wall surface of the housing 11 of the switchboard 10 by the magnetic force of the permanent magnet 23, so it can be easily attached to the housing 11 of the switchboard 10 in a short time.

Next, we will explain the second embodiment of the present invention. This embodiment differs from the first embodiment in that the shape of the permanent magnets 23 is rectangular and there are four of them. Note that the same reference numbers indicate the same components, so the explanation will be omitted unless necessary.

In Figures 3A and 3B, on the other side of the rectangular fixed base 21, four rectangular fixed pedestals 27 housing permanent magnets 26 inside are arranged in two rows in parallel along the longitudinal direction of the fixed base 21. In this way, the number of permanent magnets 26 has been increased from two to four compared to the first embodiment, so that heavy surveillance equipment can be adequately held.

The fixed base 21 and the fixed base 27 are either integrally formed or are integrated with each other using fixing screws, fixing rivets, etc. The fixed base 27 is rectangular and houses a rectangular permanent magnet 26 inside. The permanent magnet 26 is firmly fixed to the housing of the fixed base 27 with a synthetic adhesive.

The fixed base 20, surveillance equipment 21, mounting portion 22, permanent magnet 26, and fixed base 27 are therefore integrated together to form the surveillance equipment fixing device 20. As with FIG. 2C described above, the surveillance equipment fixing device 20 is fixed by an operator to any predetermined position on the wall surface of the housing 11 of the switchboard 10 by the magnetic force of the permanent magnet 26. It goes without saying that the permanent magnet 26 has a magnetic force capable of holding the surveillance equipment fixing device 20 in a fixed position.

In this way, the surveillance equipment fixing device 20 is fixed to any predetermined position on the wall surface of the housing 11 of the switchboard 10 by the magnetic force of the permanent magnets 23, so it can be easily attached to the housing 11 of the switchboard 10 in a short time. In addition, since the number of permanent magnets 26 is large at four, it is possible to adequately hold the heavy surveillance equipment 22.

In the first and second embodiments, if the magnetic attraction of the permanent magnets 24, 26 is lost and the monitoring equipment fixing device 20 falls, it may come into contact with the transformer 15 or the like, causing a ground fault or short circuit, which may lead to a power outage or the like. For this reason, it is advisable to strengthen the attraction force. For this reason, the following configuration is proposed in this embodiment.

In FIG. 4, a yoke (yoke) 28 made of a magnetic material and having a bottomed cylindrical shape (cap shape) formed to surround the permanent magnets 24, 26 is provided on the permanent magnets 24, 26. The yoke 28 is composed of a peripheral surface portion 28S that surrounds the outer periphery of the permanent magnets 24, 26, and a flat surface portion 28F that is connected to the peripheral surface portion 28S. The peripheral surface portion 28S and the flat surface portion 28F can form a bottomed cylindrical shape. Note that the yoke 28 is a bottomed cylindrical shape in the case of the permanent magnet 24, and a bottomed rectangular cylindrical shape in the case of the permanent magnet 26.

Therefore, by using the permanent magnets 24, 26 in combination with the yoke 28, the magnetic flux does not leak into the atmosphere, but is concentrated on the side of the housing 11 with which the yoke 28 comes into contact, greatly improving the magnetic force. The material of this yoke 28 can be a magnetic material such as pure iron with few impurities or low-carbon steel (low-carbon steel).

In addition, by making the fixed bases 25 and 27 shown in Figures 2A and 3A from a magnetic material, the fixed bases 25 and 27 can also function as a yoke.

Figure 5 shows a modified version of Figure 4. In this modified version, the permanent magnets 24, 26 are sandwiched between multiple plate-shaped yokes 29. This is particularly suitable for rectangular permanent magnets 26. Even in this form, by combining the permanent magnets 26 with the yokes 29, the magnetic flux is concentrated on the side of the housing 11 where the yokes 29 come into contact, greatly improving the attractive force. The material of this yoke 29 can also be a magnetic material such as pure iron with few impurities or low-carbon steel (low-carbon steel).

Next, the connection structure between the fixed pedestals 25, 27 and the fixed base 21 in the first and second embodiments will be described.

In FIG. 6, the fixed threaded portion (male) 30 is attached by a fixing method such as welding to the side of the fixed bases 25 and 27 facing the fixed base 21. Meanwhile, the fixed threaded portion (female) 31 is formed by tapping or the like on the side of the fixed base 21 facing the fixed bases 25 and 27. Then, by rotating the fixed bases 25 and 27, the fixed threaded portion (male) 30 can be screwed into the fixed threaded portion (female) 31, and the fixed bases 25 and 27 can be joined to the fixed base 21.

Similarly, in FIG. 7, a fixed screw portion (male) 32 is attached by a fixing method such as welding to the side of the fixed base 21 facing the fixed pedestals 25, 27. Meanwhile, a fixed screw portion (female) 33 is formed by tapping or the like on the side of the fixed pedestals 25, 27 facing the fixed base 21. Then, by rotating the fixed pedestals 25, 27, the fixed screw portion (female) 33 can be screwed into the fixed screw portion (male) 32, and the fixed pedestals 25, 27 and the fixed base 21 can be joined.

In this way, the fixed base 21 and the fixed pedestals 25, 27 are screwed together to form an integrated unit, so that the fixed base 21 and the fixed pedestals 25, 27 can be easily joined together.

In the first and second embodiments, the monitoring equipment fixing device 20 is magnetically attached to the housing 11 of the switchboard 10 by the permanent magnets 24, 26. However, if the monitoring equipment fixing device 20 falls off the housing 11 for some reason, it may come into contact with the transformer 15 or the like, causing a ground fault or short circuit, which may lead to a power outage or the like. For this reason, the following configuration is proposed in this embodiment.

In FIG. 8, a wire 34, which is a connecting member, is attached to the surveillance equipment fixing device 20, and a hook 35 is attached to the tip of this wire 34 on the side opposite the surveillance equipment fixing device 20. The hook 35 is hooked into a hook engagement hole 36 formed in the housing 11. The length of the wire 34 is determined so that the surveillance equipment fixing device 20 will not come into contact with the transformer 15, etc., when it falls off the housing 11. A chain, etc., can be used instead of the wire 34.

Therefore, even if the monitoring equipment fixing device 20 falls off for some reason and falls to the position shown by the solid line as shown by the dashed line, the monitoring equipment fixing device 20 does not come into contact with the transformer 15, etc., and therefore it is possible to avoid phenomena such as a ground fault or short circuit causing a power outage, etc.

In addition, Figures 9 and 10 show the configuration for attaching the wire 34 to the surveillance equipment fixing device 20. In Figure 9, a wire engagement portion 37 is formed on the side surface of the fixing bases 25, 27, and the tip of the wire 34 is inserted into a wire engagement hole 38 formed in this wire engagement portion 37, thereby attaching the wire 34.

In addition, in FIG. 10, a wire engagement hole 39 is formed next to the fixing screw (female) 33 of the fixing bases 25, 27, and the tip of the wire 34 is inserted into this wire engagement hole 39 to attach the wire 34.

In this way, in this embodiment, even if the monitoring device fixing device 20 falls off the housing 11 for some reason, the wire 34 prevents the monitoring device fixing device 20 from coming into contact with the transformer 15, etc., and therefore it is possible to avoid the risk of a ground fault or short circuit causing a power outage, etc.

In the embodiment shown in FIG. 8, the lengths of the wires 34 must be uniform so that the monitoring equipment fixing device 20 does not fall and come into contact with the transformer 15, etc., which is expected to increase the number of labor hours. For this reason, the following configuration is proposed in this embodiment.

In FIG. 11, the hook engagement hole 36 and the surveillance equipment fixing device 20 are connected by a coil-shaped expandable connecting member 40 instead of the wire 34. The expandable coil-shaped connecting member 40 may be a metal coil spring or a strap wire coil made of a coil-shaped wire (e.g., stainless steel wire) coated with a synthetic resin (e.g., urethane).

Therefore, as shown by the dashed line, even if the hook engagement hole 36 and the surveillance equipment fixing device 20 are separated, the expandable connecting member 40 can extend to connect the hook engagement hole 36 and the surveillance equipment fixing device 20.

Even if the surveillance equipment fixing device 20 falls off for some reason and falls to the position shown by the solid line, the expandable connecting member 40 will contract, returning the surveillance equipment fixing device 20 to a position where it does not come into contact with the transformer 15, etc., thereby preventing a ground fault or short circuit that could cause a power outage. Furthermore, there is no need to make the lengths of the wires 34 the same as shown in Figure 5, which helps prevent an increase in labor hours.

In the embodiment shown in FIG. 11, the hook engagement hole 36 and the surveillance equipment fixing device 20 are connected by a coil-shaped expandable connecting member 40. However, with this method, if the distance between the hook engagement hole 36 and the surveillance equipment fixing device 20 is large, the expandable connecting member 40 will also be long, so if the surveillance equipment fixing device 20 falls, it is expected that it will come into contact with the transformer 15, etc. For this reason, the following configuration is proposed in this embodiment.

In FIG. 12, the wire 34 between the hook engagement hole 36 and the surveillance equipment fixing device 20 is wound around a winding mechanism (so-called a cord reel) 41. The winding mechanism 41 has the function of winding or unwinding the wire 34. As shown by the dashed line, even if the hook engagement hole 36 and the surveillance equipment fixing device 20 are separated, the wire 34 wound around the winding mechanism 41 can be unwound to connect the hook engagement hole 36 and the surveillance equipment fixing device 20.

In addition, even if the surveillance equipment fixing device 20 falls off for some reason and falls to the position shown by the solid line, the winding mechanism 41 winds up the wire 34, so the surveillance equipment fixing device 20 does not come into contact with the transformer 15, etc., and it is possible to avoid phenomena such as a ground fault or short circuit causing a power outage. In this way, even if the distance between the hook engagement hole 36 and the surveillance equipment fixing device 20 is large, if the surveillance equipment fixing device 20 falls, the action of the winding mechanism 41 can prevent it from coming into contact with the transformer 15, etc.

In the embodiment shown in FIG. 12, a winding mechanism 41 is provided midway along the wire 34 between the hook engagement hole 36 and the surveillance device fixing device 20. However, since the winding mechanism 41 is exposed, it is anticipated that it may cause mechanical interference with external devices and cease to function. For this reason, the following configuration is proposed in this embodiment.

In FIG. 13, for example, a winding mechanism 42 is built into the fixing bases 25, 27 of the surveillance equipment fixing device 20. The winding mechanism 42 is provided in one of the fixing bases 25, 27, but since the winding mechanism 42 only needs to be stored inside the surveillance equipment fixing device 20, it is not limited to being inside the fixing bases 25, 27. For this reason, the winding mechanism 42 is intentionally drawn in the longitudinal direction in FIG. 13 to facilitate understanding.

In this way, in this embodiment, the winding mechanism 42 is not exposed to the outside, so it is possible to avoid the risk of it causing mechanical interference with external equipment and causing it to malfunction. Of course, it goes without saying that it functions in the same way as the winding mechanism 41 shown in Figure 12.

Next, the specific configuration of the winding mechanism 42 will be described with reference to Figures 14 and 15. Figure 14 shows the winding mechanism 42 in an exploded state. Also, Figure 15 shows the right half of the winding mechanism 42 detached from the housing 11, and the left half of the winding mechanism 42 attached to the housing 11.

In FIG. 14, a cylindrical storage case 43 with a bottom is fixed to the surface of the fixed base 21 opposite the mounting portion 23 (see FIG. 2A). The storage case 43 corresponds to the fixed pedestals 25, 27. A support shaft 43A is fixed to the center of the storage case 43, and a wire withdrawal hole 43B is formed in the side wall of the storage case 43.

The winding section 44 is inserted into the support shaft 43A, and the wire 34 is wound around it so that it can be wound and unwound. The winding section 44 is composed of a bobbin 44A, a power spring 44B, and a bobbin side stopper 44C. When the wire 34 is unwound, the bobbin 44 rotates and the power spring 44B is wound and stored. When the bobbin side stopper 44C allows the bobbin 44A to rotate, the power spring 44B causes the bobbin 44A to rotate in the reverse direction, allowing the wire 34 to be wound. This operation will be described later.

A stopper 45A is formed on the winding section 44 side of the internal base 45, and permanent magnets 24, 26 are fixed to the opposite side. The stopper 45A frictionally engages with the bobbin side stopper 44C of the winding section 44 to prevent the bobbin 44A from rotating, and when the frictional engagement is released, allows the bobbin 44A to rotate.

A stopper return spring 46 is disposed on the side of the internal base 45 facing the permanent magnets 24 and 26, and moves the stopper 45A in the axial direction in response to the positions of the permanent magnets 24 and 26 relative to the housing 11.

Finally, the lid cover 47, which holds the stopper return spring 46, the internal base 45, and the winding portion 44 in the storage case 43, is fixed to the storage case 11 so as to seal the opening of the storage case 11. An opening 47A is formed in the center of the lid cover 47 through which the permanent magnets 24 and 26 appear and disappear.

Figure 15 shows the assembled state, with the right half showing the winding mechanism 42 detached from the housing 11 and the left half showing the winding mechanism 42 attached to the housing 11.

First, when the surveillance equipment fixing device 20 is not fixed to the housing 11 (right half), the permanent magnets 24, 26 are detached from the housing 11, and the internal base 45 is moved toward the bobbin 44A by the stopper return spring 46. Therefore, the stopper 45A is in an open state without frictional engagement with the bobbin side stopper 44C. Therefore, the bobbin 44A can also rotate, and the wire 34 can be paid out. When the wire 34 is paid out, a return force is charged in the charging spring 44B.

Next, when the surveillance equipment fixing device 20 is fixed to the housing 11 (left half), the permanent magnets 24, 26 are attracted to the housing 11, the stopper return spring 46 is compressed, and the internal base 45 moves toward the housing 11. As a result, the stopper 45A is in frictional engagement with the bobbin side stopper 44C, preventing the bobbin side stopper 44C from rotating. Therefore, the bobbin 44A cannot rotate.

If the surveillance equipment fixing device 20 falls off for some reason, the permanent magnets 24, 26 will come off the housing 11, and the internal base 45 will move towards the bobbin 44A by the stopper return spring 46. As a result, the stopper 45A will be released from the frictional engagement with the bobbin side stopper 44C and will be in an open state, and the bobbin 44A will rotate due to the return force of the energy storage spring 44B, allowing the wire 34 to be wound up.

When the wire 34 is wound up, the monitoring equipment fixing device 20 does not come into contact with the transformer 15, etc., so it is possible to avoid phenomena such as ground faults or short circuits that could cause power outages. In addition, because the winding mechanism 42 is not exposed to the outside, it is possible to avoid the risk of mechanical interference with external equipment causing it to stop functioning.

As described above, the present invention is characterized by storing a permanent magnet in a fixed base on which a monitoring device is mounted, and by bringing this permanent magnet into close contact with a housing made of a magnetic metal of a switchboard, the fixed base on which the monitoring device is mounted is magnetically fixed to the housing.

With this, the permanent magnet is fixed to the fixed base on which the monitoring equipment is mounted, so it can be easily installed at any position on the distribution board housing in a short amount of time.

The present invention is not limited to the above-mentioned embodiments, but includes various modified examples. The above-mentioned embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace other configurations with respect to the configuration of each embodiment.

10...distribution board, 11...housing, 12...opening and closing door, 13...surveillance sensor, 14...surveillance lighting, 15...surveillance camera, 16...power distribution section, 17...incoming line, 18...wiring, 20...surveillance equipment fixing device, 21...fixed base, 22...surveillance 22 sensor, 23...mounting section, 24, 26...permanent magnet, 25, 27...fixed base, 28, 29...yoke, 30, 32...fixing screw (male), 31, 33...fixing screw (female), 34...wire, 35...hook, 36...hook engagement hole, 40...elastic connecting member, 41, 42...winding mechanism.

Claims (7)

A distribution board including a housing formed of a metal plate made of a magnetic material, an opening/closing door for closing an opening of the housing, a power receiving/distribution device housed inside the housing, and a monitoring device fixing device having a monitoring device for monitoring the power receiving/distribution device,
The surveillance equipment fixing device includes at least a fixing base on which the surveillance equipment is attached and a permanent magnet provided on the fixing base,
The permanent magnet is brought into close contact with the housing, and the fixing base to which the monitoring device is attached is magnetically fixed to the housing ;
The surveillance equipment fixing device is composed of a fixed base, a mounting part provided on one side of the fixed base to which the surveillance equipment is attached, and the fixed base provided on the other side of the fixed base and housing the permanent magnet therein;
The permanent magnet is provided with a yoke that concentrates magnetic flux between the permanent magnet and the housing.
A switchboard characterized by: The switchboard according to claim 1,
The yoke is a cylindrical yoke that surrounds the permanent magnet.
A switchboard characterized by: The switchboard according to claim 1,
The yoke is a plate-shaped yoke that sandwiches the permanent magnet.
A switchboard characterized by: The switchboard according to claim 1,
The fixed base and the fixed seat are integrated with each other by a screw fastener.
A switchboard characterized by: A distribution board including a housing formed of a metal plate made of a magnetic material, an opening/closing door for closing an opening of the housing, a power receiving/distribution device housed inside the housing, and a monitoring device fixing device having a monitoring device for monitoring the power receiving/distribution device,
The surveillance equipment fixing device includes at least a fixing base on which the surveillance equipment is attached and a permanent magnet provided on the fixing base,
The permanent magnet is brought into close contact with the housing, and the fixing base on which the monitoring device is attached is magnetically fixed to the housing;
the surveillance equipment fixing device is composed of a fixed base, a mounting part provided on one side of the fixed base for mounting the surveillance equipment, and the fixed base provided on the other side of the fixed base and housing the permanent magnet therein;
The surveillance equipment fixing device is connected to the housing via a connecting member,
The connecting member is a wire, one end of the wire is connected to the monitoring equipment fixing device,
The other end of the wire is connected to a hook, and the hook is hooked into a hook engagement hole formed in the housing.
A switchboard characterized by: The switchboard according to claim 5,
The wire is a stretchable coiled wire.
A switchboard characterized by: The switchboard according to claim 5,
The wire between the surveillance device fixture and the hook is wound around a winding mechanism.
A switchboard characterized by:

Images