JP7053176B2 - Explosion-proof power supply - Google Patents

Description

The present invention relates to an explosion-proof power supply device that supplies power to an external device.

In an explosive atmosphere, electric power such as a gas detector is supplied with electric power from the outside via an explosion-proof switch (for example, Patent Document 1) that mechanically switches between supply and cut of electric power. Such an explosion-proof switch has a pressure-resistant explosion-proof structure in which even if an explosion occurs inside the explosion-proof switch due to a spark when the contact of the switching unit is switched, the influence of the explosion does not extend to the outside of the explosion-proof switch.

Japanese Unexamined Patent Publication No. 2016-154093

Explosion-proof switches that are mechanically operated as described above must meet the standards in accordance with the "Factory Electrical Equipment Explosion-Proof Guidelines" in order to realize a pressure-resistant explosion-proof structure, and their size cannot be avoided. In particular, in an explosive atmosphere, multiple electrical devices are often used, and in that case, by arranging a large explosion-proof switch for each of the multiple electrical devices, devices including electrical devices and distribution cables are installed. The degree of freedom of overall placement is reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a compact explosion-proof power supply device.

The explosion-proof power supply device of the present invention is an explosion-proof power supply device that supplies electric power to an external device, and is a switching means for switching between supply and cutoff of electric power from the power source to the external device, and an operation independently provided outside the device. A control means for controlling the switching means upon receiving an instruction from the means is provided inside the apparatus.

Further, the power source is preferably an external power source.

Further, it is preferable that the device is provided with a voltage conversion means for converting the AC voltage supplied from the power source into the DC voltage.

Further, it is preferable that a plurality of the switching means are provided, and each of the plurality of switching means can be configured to be able to switch between supplying and shutting off the power supply from the power source to each of the plurality of external devices.

Further, it is preferable that the electric power supplied from the power source can be supplied to another explosion-proof power supply device.

According to the present invention, it is possible to provide a small explosion-proof power supply device.

It is a schematic diagram which shows the structure of the explosion-proof power supply device which concerns on one Embodiment of this invention. It is a schematic diagram which shows the structure of the operation means and the operated means of the explosion-proof power supply device of FIG.

Hereinafter, the explosion-proof power supply device according to the embodiment of the present invention will be described with reference to the accompanying drawings. However, the explosion-proof power supply device of the present invention is not limited to the following embodiments.

As shown in FIG. 1, the explosion-proof power supply device 1 of the present embodiment is an explosion-proof power supply device that is used in an explosive atmosphere and supplies electric power to an external device D outside the explosion-proof power supply device 1. The explosion-proof power supply device 1 has an explosion-proof structure provided with an explosion-proof container 2 so that it can be used in an explosive atmosphere. In the present embodiment, the explosion-proof power supply device 1 has a pressure-resistant explosion-proof structure defined in the “factory electrical equipment explosion-proof guideline”. However, the explosion-proof power supply device 1 may have an explosion-proof structure that does not ignite the surrounding explosive atmosphere, and may have another explosion-proof structure such as an internal pressure explosion-proof structure.

The external device D is a device that is used in an explosive atmosphere and is operated by being supplied with electric power from the outside of the device D such as the explosion-proof power supply device 1. The external device D is not particularly limited, and for example, a known gas detector, pressure transmitter, lighting device, or the like is used. Further, in the present embodiment, an example in which four external devices D can be connected to the explosion-proof power supply device 1 is shown, but the number of connected external devices D is not limited to this, and one or more external devices D may be connected.

As shown in FIG. 1, the explosion-proof power supply device 1 is provided with a switching means 5 for switching between supply and cut of power from the power supply 3 to the external device D, and an operating means 7 independently provided outside the device 1. When the instruction is received, the control means 6 for controlling the switching means 5 is provided inside the device 1. Since the explosion-proof power supply device 1 can switch between supplying and shutting off power to the external device D by an operating means 7 independently provided outside the explosion-proof power supply device 1, it is inevitable to increase the size of the mechanical explosion-proof power supply device 1. The size of the device can be reduced compared to the switch.

The power source 3 is a power supply source for supplying electric power to the external device D. In the present embodiment, the power supply 3 is an external power supply located outside the explosion-proof power supply device 1 (outside the explosion-proof container 2), as shown in FIG. The external power supply 3 is connected to the voltage conversion means 4 housed inside the explosion-proof power supply device 1 (inside the explosion-proof container 2) so as to be able to supply electric power. As the external power source 3, for example, an AC power source such as a commercial AC power source in a non-explosive atmosphere can be used. In that case, the external power supply 3 and the voltage conversion means 4 are connected via an AC power supply cable. Since the AC power supply cable can be formed thinner than the DC power supply cable, it can be freely routed in an explosive atmosphere without occupying space. Therefore, by using an AC power supply as the external power supply 3, the explosion-proof power supply device 1 can be arranged in the vicinity of the external device D far away from the non-explosive atmosphere, which is from the viewpoint of cable routing. Further, it is advantageous from the viewpoint of operability of the explosion-proof power supply device 1 and the external device D. Further, when an external power source is used as the power source 3, if it is a conventional mechanical explosion-proof switch, wiring at an internal contact is required in the device, and it is necessary to secure a space for the wiring. However, as described below, the explosion-proof power supply device 1 is provided with the operating means 7 independently outside the device, so that even if an external power supply is used as the power supply 3, it is for wiring as compared with the mechanical explosion-proof switch. Since the space can be reduced, the size of the device can be reduced. However, the power source is not limited to the external power source for supplying AC power as long as it is the source of power to be supplied to the external device D. For example, the external power source for supplying DC power provided outside the explosion-proof power supply device. It may be a power source or an internal power source for supplying DC power (for example, a lithium ion battery) provided inside the explosion-proof power supply device.

As described above, the explosion-proof power supply device 1 includes a voltage conversion means 4 for converting an AC voltage supplied from the power supply 3 into a DC voltage inside the device 1. The voltage conversion means 4 is housed inside the explosion-proof power supply device 1 (inside the explosion-proof container 2), is connected to the power supply 3 so as to receive AC power, and is connected to the switching means 5 and the control means 6 so as to be able to supply DC power. Will be done. The voltage conversion means 4 is not particularly limited, but a known AC / DC converter can be used. Since the explosion-proof power supply device 1 includes the voltage conversion means 4 inside the device 1, it is not necessary to provide the voltage conversion means in the external device D, so that it is possible to suppress the increase in size and cost of the external device D. However, the explosion-proof power supply device may not have the voltage conversion means 4 when the DC power supply power supply is used as the power supply 3 as described above, and the external device D includes the voltage conversion means. If so, the voltage conversion means 4 may not be provided because the AC power may be supplied to the external device D.

The switching means 5 receives an instruction from the control means 6 and switches between supplying and shutting off the power supply from the power supply 3 to the external device D. As shown in FIG. 1, the switching means 5 is provided inside the explosion-proof container 2 between the power supply 3 and the external device D, and is communicably connected to the control means 6. In the present embodiment, the switching means 5 is provided between the voltage conversion means 4 and the external device D, and switches between the supply and cutoff of electric power from the voltage conversion means 4 to the external device D. However, the switching means is not limited to the present embodiment as long as it is provided between the power source 3 and the external device D and can switch between the supply and the cutoff of the power from the power source 3 to the external device D. For example, it may be provided between the power supply 3 and the voltage conversion means 4 so as to switch between supplying and cutting off the power from the power supply 3 to the voltage converting means 4.

As shown in FIG. 1, the explosion-proof power supply device 1 is provided with a plurality of switching means 5, and each of the plurality of switching means 5 supplies and cuts off power from the power supply 3 to each of the plurality of external devices D. And can be switched. Each of the plurality of switching means 5 is provided in parallel with each other between the power supply 3 (voltage conversion means 4 in the illustrated example) and each of the plurality of external devices D. The explosion-proof power supply device 1 is provided with a plurality of switching means 5 (four in the illustrated example), so that power can be independently supplied to each of the plurality of (four in the illustrated example) external devices D. You can switch between supply and cutoff. Since it is possible to switch between power supply and cutoff for each external device D, for example, when one external device D needs power cutoff for maintenance, the operation of the other external device D is not stopped. Only the one external device D can be separated and maintained. However, the number of the switching means is not particularly limited as long as it is provided with at least one.

As the switching means 5, a known relay switch is used in this embodiment. The relay switch receives the relay control signal from the control means 6 and switches on / off to switch between supplying and shutting off the power from the power supply 3 to the external device D. It is preferable to adopt a relay switch as the switching means 5 in that the power supply and the cutoff can be stably switched. However, the switching means is not limited to the relay switch as long as it can switch between supplying and shutting off the power from the power supply 3 to the external device D, and for example, a known switching circuit can be used.

The operating means 7 is remotely controlled by acting on the operated means 8 provided inside the explosion-proof power supply device 1 (inside the explosion-proof container 2) from the outside of the explosion-proof power supply device 1 (outside the explosion-proof container 2). The instruction is sent to the control means 6 via the operated means 8. As shown in FIG. 1, the operating means 7 is provided outside the explosion-proof power supply device 1 independently of the explosion-proof power supply device 1. More specifically, the operating means 7 is provided outside the explosion-proof container 2 away from the operated means 8 on which the operating means 7 acts and without contacting the operated means 8. In the explosion-proof power supply 1, since the operating means 7 is independently provided outside the explosion-proof container 2, wiring at internal contacts is not required unlike a mechanical explosion-proof switch, thereby reducing the space for wiring. Therefore, the size of the device can be reduced.

In the present embodiment, as shown in FIG. 2, the operating means 7 is a magnet that generates a magnetic field, and the operated means 8 is a magnetic sensor 8a, 8b, 8c that detects the action of the magnetic field of the magnet. The magnet, which is the operating means 7, is configured to be able to move forward and backward with respect to the magnetic sensors 8a, 8b, and 8c, which are the operating means 8, outside the explosion-proof container 2. On the other hand, the magnetic sensors 8a, 8b, and 8c, which are the operated means 8, are housed inside the explosion-proof container 2 and are communicably connected to the control means 6. By moving the magnet closer to the magnetic sensors 8a, 8b, 8c, the magnetic sensors 8a, 8b, 8c sense the magnetism acting through the magnetically permeable explosion-proof container wall 2a and turn on, and magnetically sense the magnetism. The signal is transmitted to the control means 6. Further, by moving the magnet away from the magnetic sensors 8a, 8b, 8c, the magnetic sensors 8a, 8b, 8c do not detect the magnetism and are turned off, and the transmission of the magnetic sensing signal to the control means 6 is stopped. By using a magnet as the operating means 7 and using a magnetic sensor as the operated means 8, magnetism acting apart from each other can be used. Therefore, the operating means 7 can be directly connected to the operated means 8 inside the device from the outside of the device. There is no need to connect, the need for wiring caused by direct connection can be eliminated, and the device can be miniaturized.

In the present embodiment, the magnetic sensors 8a, 8b, and 8c each correspond to a plurality of switching means 5 for selecting one of a plurality of (four in the illustrated example) switching means 5 as a control target. (4 in the illustrated example) switching means selection magnetic sensor 8a, supply switching magnetic sensor 8b for switching from the power cutoff state to the supply state of the selected switching means 5, and the selected switching. It is provided with a magnetic sensor 8c for switching the cutoff for switching from the power supply state of the means 5 to the cutoff state. When it is necessary to switch between supplying and shutting off power to the external device D, the switching means can be selected by bringing the magnet closer to the switching means selection magnetic sensor 8a corresponding to the switching means 5 requiring switching. The magnetic sensor 8a senses the magnetism of the magnet and turns on, and transmits a signal for selecting the switching means 5 that needs to be switched as the control target to the control means 6. Next, for example, when supplying power to the external device D, by bringing the magnet closer to the supply switching magnetic sensor 8b, the supply switching magnetic sensor 8b senses the magnetism of the magnet and turns on, and the power is turned on. A signal for switching from the cutoff state to the supply state is transmitted to the control means 6. Alternatively, when cutting off the power to the external device D, by moving the magnet closer to the cutoff switching magnetic sensor 8c, the cutoff switching magnetic sensor 8c senses the magnetism of the magnet and turns on, and the power is turned on. A signal for switching from the supply state to the cutoff state is transmitted to the control means 6. In this way, in the explosion-proof power supply device 1, each of the plurality of switching means 5 can be operated independently of each other, and the supply and cutoff of electric power to each of the plurality of external devices D can be independently switched. Further, in the explosion-proof power supply device 1, the switching of the switching means 5 includes a step of selecting the switching means 5 that needs to be switched as a control target and a step of switching between supplying and cutting off the power of the selected switching means 5. By carrying out in two stages, it is possible to suppress an erroneous operation of the switching means 5 and perform switching more reliably.

As the operating means 7 and the operated means 8, a magnet and a magnetic sensor are used in the present embodiment, but the operating means 7 acts on the operated means 8 and the operating means 7 operates the operated means 8. As long as the instruction can be sent to the control means 6 via the control means 6, the present invention is not particularly limited thereto, and may be, for example, a signal transmitting device and a signal receiving device such as a wireless LAN or infrared communication.

When the control means 6 receives an instruction from the operation means 7 via the operated means 8, the control means 6 transmits a control signal to the switching means 5 to control the switching means 5. As shown in FIG. 1, the control means 6 is connected to the voltage conversion means 4 so as to receive electric power, and is communicably connected to the switching means 5 and the operated means 8, respectively. In the present embodiment, the control means 6 senses the magnetic action of the magnet when the magnet, which is the operating means 7, is brought close to the magnetic sensors 8a, 8b, 8c, which are the operated means 8, magnetic sensors 8a, 8b. , 8c receives a magnetic sensing signal and transmits a relay control signal to the relay switch which is the switching means 5, thereby switching the relay switch on / off to supply and cut off the power to the external device D. To switch. In the present embodiment, the control means 6 is configured to transmit the relay control signal to the relay switch after continuously receiving the magnetic sensing signal from the magnetic sensors 8a, 8b, 8c for a predetermined time. Therefore, even if the magnet is suddenly brought close to the magnetic sensors 8a, 8b, 8c within a predetermined time (within a predetermined time), the relay switch is not immediately switched, so that erroneous operation of the relay switch is suppressed. can do. The predetermined time can be appropriately set to be longer than the time from when the magnet is arranged within the magnetic detection range of the magnetic sensors 8a, 8b, 8c to when the control means 6 receives the magnetic detection signal, for example, 0. It can be set to .5 seconds or longer, preferably 1 second or longer, and more preferably 2 seconds or longer. The control means 6 is not particularly limited, and a known central processing unit (CPU) or the like can be used. Further, although the control means 6 is supplied with electric power via the voltage conversion means 4 in the present embodiment, electric power may be supplied from another power source such as a battery.

As shown in FIG. 1, the explosion-proof power supply device 1 may include a display means 9 for displaying the state of the switching means 5. The display means 9 is housed inside the explosion-proof container 2 so as to be visible from the outside of the explosion-proof container 2, and is communicably connected to the control means 6. The display means 9 displays, for example, which of the plurality of switching means 5 is currently selected as the control target, and whether the selected switching means 5 is in the power supply state or the cutoff state. Can be done. As the display means 9, for example, a known LED display or display lamp can be adopted.

As shown in FIG. 1, the explosion-proof power supply device 1 may be further configured so that the electric power supplied from the power supply 3 can be supplied to another explosion-proof power supply device 10. In the present embodiment, the explosion-proof power supply device 1 transfers the AC voltage supplied from the external power supply into the device 1 to another explosion-proof power supply device 10 outside the device 1 without converting it into a DC voltage by the voltage conversion means 4. Supply. Further, the other explosion-proof power supply device 10 is configured in the same manner as the explosion-proof power supply device 1. Since the explosion-proof power supply device 1 can supply power to another explosion-proof power supply device 10, there is a case where it is necessary to supply power from an external power source in a non-explosive atmosphere to a plurality of bases in the explosive atmosphere. However, by using the explosion-proof power supply device 1, it is not necessary to route power cables in parallel at each of a plurality of bases, and a plurality of bases are connected in series via the explosion-proof power supply device 1 to distribute the power cable. The cable space can be reduced. Further, since the external device D can be connected to the other explosion-proof power supply device 10, it is possible to easily supply and cut off the power to many external devices D. The explosion-proof power supply device is not limited to this embodiment as long as the power supplied from the power source can be supplied to another explosion-proof power supply device. For example, the AC voltage supplied from the external power supply is converted into a DC voltage. Then, the DC power may be supplied to the other explosion-proof power supply device, or the DC power supplied from the internal power supply may be supplied to the other explosion-proof power supply device. Further, the other explosion-proof power supply device may have a structure different from that of the explosion-proof power supply device.

1 Explosion-proof power supply device 2 Explosion-proof container 2a Explosion-proof container wall 3 Power supply 4 Voltage conversion means 5 Switching means 6 Control means 7 Operating means 8 Operated means 8a Switching means selection magnetic sensor 8b Supply switching magnetic sensor 8c Breaking switching magnetic sensor 9 Display means 10 Other explosion-proof power supply device D External device

Claims (5)

An explosion-proof power supply that supplies power to external devices
A switching means for switching between power supply and cutoff from the power supply to external devices,
Upon receiving an instruction from an operating means independently provided outside the device, a control means for controlling the switching means and a control means.
An operated means that receives an action remotely from the operating means and sends an instruction to the controlling means is provided inside the device.
The power source is an external power source.
The operating means is a magnet, and the operated means is a magnetic sensor.
Explosion-proof power supply. An explosion-proof power supply that supplies power to external devices
A switching means for switching between power supply and cutoff from the power supply to external devices,
Upon receiving an instruction from an operating means independently provided outside the device, a control means for controlling the switching means and a control means.
Inside the device,
The power source is an external power source arranged in a non-explosive atmosphere and connected to the explosion-proof power supply device used in the explosive atmosphere via a cable .
Explosion-proof power supply. The explosion-proof power supply device according to claim 1 or 2, further comprising a voltage conversion means for converting an AC voltage supplied from the power source into a DC voltage inside the device. A plurality of the switching means are provided.
Each of the plurality of switching means is configured to be able to switch between supplying and shutting off power from the power source to each of the plurality of external devices.
The explosion-proof power supply device according to any one of claims 1 to 3. The explosion-proof power supply device according to any one of claims 1 to 4, wherein the electric power supplied from the power supply can be supplied to another explosion-proof power supply device.

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