JP2019013105A - Explosion proof power supply device - Google Patents

Abstract

To provide a compact explosion proof power supply device.SOLUTION: An explosion proof power supply device 1 of the present invention is the explosion proof power supply device 1 supplying power to an external device D, and has switching means 5 which switches between a supply of power to the external device D from a power source 3 and an interception, and control means 6 which controls the switching means 5 when receiving an instruction from operating means 7 provided to an exterior of the device 1 independently, within the device 1.SELECTED DRAWING: Figure 1

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 is supplied to an electric device such as a gas detector from the outside via an explosion-proof switch (for example, Patent Document 1) that mechanically switches between supply and interruption of electric power. Such an explosion-proof switch has a pressure- and explosion-proof structure in which, even if an explosion occurs inside the explosion-proof switch due to spark when switching the contacts of the switching unit, the explosion does not affect the outside of the explosion-proof switch.

JP-A-2006-154093

  The mechanically operated explosion-proof switch as described above needs to satisfy the standard in conformity with the “factory electrical equipment explosion-proof guideline” in order to realize a pressure-proof explosion-proof structure, and an increase in size cannot be avoided. In particular, in an explosive atmosphere, multiple electrical devices are often used, and in that case, a large explosion-proof switch is placed for each of the multiple electrical devices, so that devices including electrical devices and distribution cables are used. The degree of freedom in overall arrangement is reduced.

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

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

  The power source is preferably an external power source.

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

  Preferably, a plurality of the switching means are provided, and each of the plurality of switching means is configured to be able to switch between supply and interruption of power from the power source to each of the plurality of external devices.

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

  According to the present invention, a small explosion-proof power supply device can be provided.

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

  Hereinafter, an explosion-proof power supply device according to an 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 this embodiment is an explosion-proof power supply device that is used in an explosive atmosphere and supplies 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 including 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-proof explosion-proof structure defined in the “factory electrical equipment explosion-proof guidelines”. 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 operates 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 fixture, or the like is used. 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 external devices D to be connected is not limited to this, and one or more external devices may be connected.

  As shown in FIG. 1, the explosion-proof power supply device 1 includes a switching means 5 that switches between supply and interruption of power from the power supply 3 to the external device D, and an operation means 7 that is provided outside the apparatus 1 independently. When receiving the instruction, the apparatus 1 includes control means 6 for controlling the switching means 5. Since the explosion-proof power supply device 1 can be switched between supply and cut-off of electric power to the external device D by the operation means 7 provided outside the explosion-proof power supply device 1 independently, the mechanical explosion-proof which is inevitable to enlarge. The device can be downsized compared to the switch.

  The power supply 3 is a supply source of power supplied to the external device D. In this embodiment, the power source 3 is an external power source 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 accommodated in the explosion-proof power supply device 1 (inside the explosion-proof container 2) so that power can be supplied. 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 converting 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 without occupying space in an explosive atmosphere. Therefore, the explosion-proof power supply device 1 can be disposed far from the non-explosive atmosphere and in the vicinity of the external device D by using an AC power source as the external power source 3, which is from the viewpoint of cable routing. Moreover, it is advantageous from the viewpoint of the operability of the explosion-proof power supply device 1 and the external device D. When an external power source is used as the power source 3, a conventional mechanical explosion-proof switch requires wiring at an internal contact in the apparatus, 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. Therefore, even if an external power supply is used as the power supply 3, it is more wired than a mechanical explosion-proof switch. Therefore, it is possible to reduce the size of the apparatus. However, the power source is not limited to an external power source for supplying AC power as long as it is a source of power supplied to the external device D. For example, an external power source for DC power provided outside the explosion-proof power supply device It may be a power supply, or may be an internal power supply for supplying direct current 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 the voltage conversion means 4 for converting the AC voltage supplied from the power supply 3 into a DC voltage. The voltage conversion means 4 is accommodated in the explosion-proof power supply device 1 (inside the explosion-proof container 2), connected to the power source 3 so as to receive AC power, and connected to the switching means 5 and the control means 6 so as to be able to supply DC power. Is 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 unit 4 inside the device 1, it is not necessary to provide the voltage conversion unit in the external device D. Therefore, the size and cost of the external device D can be suppressed. However, the explosion-proof power supply device does not need to include 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 it is, the AC power may be supplied to the external device D, so the voltage conversion means 4 may not be provided.

  In response to an instruction from the control unit 6, the switching unit 5 switches between supply and interruption of power from the power source 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 source 3 and the external device D, and is connected to the control means 6 so as to be communicable. In the present embodiment, the switching unit 5 is provided between the voltage conversion unit 4 and the external device D, and switches between power supply and interruption from the voltage conversion unit 4 to the external device D. However, the switching unit 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 power supply and cutoff from the power source 3 to the external device D. For example, it may be configured between the power supply 3 and the voltage conversion means 4 so as to switch between supply and interruption of power from the power supply 3 to the voltage conversion means 4.

  As shown in FIG. 1, the explosion-proof power supply device 1 includes 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 a 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 source 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 includes a plurality of (four in the illustrated example) switching means 5, so that each of the plurality (four in the illustrated example) of external devices D can be independently powered. Supply and shut-off can be switched. Since it is possible to switch between power supply and cutoff for each external device D, for example, when one external device D needs to shut down power for maintenance, without stopping the operation of the other external device D, Only that one external device D can be disconnected for maintenance. However, the number of switching means is not particularly limited as long as at least one switching means is provided.

  In the present embodiment, a known relay switch is used as the switching unit 5. The relay switch receives a relay control signal from the control means 6, switches on / off, and switches between supply and cut-off of power from the power supply 3 to the external device D. Adopting a relay switch as the switching means 5 is preferable in that it can stably switch between power supply and interruption. However, the switching means is not limited to a relay switch as long as it can switch between supply and interruption of power from the power source 3 to the external device D, and for example, a known switching circuit can also be used.

  The operating means 7 is remotely operated by acting on the operated means 8 provided inside the explosion-proof power supply device 1 (inside the explosion-proof container 2) from outside the explosion-proof power supply apparatus 1 (outside the explosion-proof container 2). Then, an 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 from the explosion-proof power supply device 1. More specifically, the operating means 7 is provided outside the explosion-proof container 2 without being in contact with the operated means 8 so as to be separated from the operated means 8 on which the operating means 7 acts. In the explosion-proof power supply device 1, since the operation means 7 is provided outside the explosion-proof container 2, wiring at the internal contact is not required unlike the mechanical explosion-proof switch, thereby reducing the space for wiring. Therefore, the apparatus can be reduced in size.

  In this embodiment, as shown in FIG. 2, the operating means 7 is a magnet that generates a magnetic field, and the operated means 8 is magnetic sensors 8a, 8b, and 8c that detect the action of the magnetic field of the magnet. The magnet that is the operation means 7 is configured to be movable back and forth with respect to the magnetic sensors 8 a, 8 b, and 8 c that are the operated means 8 outside the explosion-proof container 2. On the other hand, the magnetic sensors 8a, 8b, 8c, which are the operated means 8, are accommodated in the explosion-proof container 2 and connected to the control means 6 so as to be communicable. By bringing the magnet closer to the magnetic sensors 8a, 8b, and 8c, the magnetic sensors 8a, 8b, and 8c are turned on by detecting the magnetism acting through the explosion-proof container wall 2a that is magnetically permeable. A signal is transmitted to the control means 6. Further, by moving the magnet away from the magnetic sensors 8a, 8b, and 8c, the magnetic sensors 8a, 8b, and 8c stop sensing the magnetism and are turned off, and stop transmitting the magnetic sensing signal to the control means 6. By using a magnet as the operating means 7 and a magnetic sensor as the operated means 8, it is possible to use magnetism acting separately, so that the operating means 7 is directly connected to the operated means 8 inside the apparatus from the outside of the apparatus. There is no need for connection, the necessity of wiring caused by direct connection can be eliminated, and downsizing of the apparatus can be realized.

  In the present embodiment, the magnetic sensors 8a, 8b, and 8c are each a plurality of switching means 5 for selecting any one of a plurality (four in the illustrated example) of switching means 5 as a control target. (4 in the illustrated example) magnetic sensor 8a for switching means selection, magnetic sensor 8b for supply switching for switching the selected switching means 5 from the power cutoff state to the supply state, and the selected switching A cutoff switching magnetic sensor 8c for switching from the power supply state of the means 5 to the cutoff state is provided. When it is necessary to switch between supplying and shutting off power to the external device D, the switching means is selected by bringing the magnet closer to the switching means selection magnetic sensor 8a corresponding to the switching means 5 that needs to be switched. The magnetic sensor 8a detects the magnetism of the magnet and is turned on to transmit a signal for selecting the switching means 5 that needs to be switched as a control target to the control means 6. Next, for example, when supplying electric power to the external device D, the supply switching magnetic sensor 8b senses the magnetism of the magnet and is turned on by bringing the magnet close to the supply switching magnetic sensor 8b. A signal for switching from the shut-off state to the supply state is transmitted to the control means 6. Alternatively, in order to cut off the power to the external device D, the cut-off switching magnetic sensor 8c senses the magnetism of the magnet and is turned on by bringing the magnet close to the cut-off switching magnetic sensor 8c. 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 power supply to each of the plurality of external devices D can be switched independently of the power supply. Further, in the explosion-proof power supply device 1, the switching unit 5 is switched as a control target by switching the switching unit 5 that needs to be switched, and a step of switching between supply and interruption of power of the selected switching unit 5. By carrying out in two steps, it is possible to suppress erroneous operation of the switching means 5 and to perform switching more reliably.

  In this embodiment, a magnet and a magnetic sensor are used as the operating means 7 and the operated means 8. However, the operating means 7 acts on the operated means 8, and the operating means 7 changes the operated means 8. As long as an instruction can be sent to the control means 6 via the communication device, the signal transmission device and the signal reception device such as a wireless LAN or infrared communication may be used.

  When the control unit 6 receives an instruction from the operation unit 7 via the operated unit 8, the control unit 6 transmits a control signal to the switching unit 5 to control the switching unit 5. As shown in FIG. 1, the control means 6 is connected to the voltage conversion means 4 so as to be able to receive electric power, and is connected to the switching means 5 and the operated means 8 so as to be able to communicate with each other. In the present embodiment, the control unit 6 detects the magnetic action of the magnets 8a, 8b when the magnet as the operation unit 7 is brought close to the magnetic sensors 8a, 8b, 8c as the operated unit 8. , 8c, receiving a magnetic sensing signal and transmitting a relay control signal to the relay switch which is the switching means 5, thereby switching on / off of the relay switch to supply and cut off the power to the external device D. Switch. In this embodiment, the control means 6 is configured to transmit a relay control signal to the relay switch after continuously receiving a magnetic sensing signal from the magnetic sensors 8a, 8b, and 8c for a predetermined time. Therefore, even if the magnet is unexpectedly brought close to the magnetic sensors 8a, 8b, and 8c (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 as a time longer than the time from when the magnet is arranged in the magnetic detection range of the magnetic sensors 8a, 8b, and 8c until the control means 6 receives the magnetic detection signal. .5 seconds or more, preferably 1 second or more, more preferably 2 seconds or more. The control means 6 is not particularly limited, and a known central processing unit (CPU) can be used. In the present embodiment, the control unit 6 is supplied with power via the voltage conversion unit 4, but may be supplied with power from another power source such as a battery.

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

  Further, as shown in FIG. 1, the explosion-proof power supply device 1 may be configured to be able to supply power supplied from the power supply 3 to another explosion-proof power supply device 10. In the present embodiment, the explosion-proof power supply device 1 is connected to another explosion-proof power supply device 10 outside the device 1 without converting the AC voltage supplied from the external power source into the device 1 into a DC voltage by the voltage conversion means 4. Supply. The other explosion-proof power supply 10 is configured in the same manner as the explosion-proof power supply 1. Since the explosion-proof power supply 1 can supply power to the other explosion-proof power supply 10, it is necessary to supply power from an external power supply in a non-explosive atmosphere to a plurality of locations in the explosive atmosphere. However, the use of the explosion-proof power supply device 1 eliminates the need to route power cables in parallel at each of the plurality of bases, and connects the plurality of bases in series via the explosion-proof power supply device 1 to distribute the power cables. The search 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 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 supply can be supplied to other explosion-proof power supply devices. For example, the AC voltage supplied from the external power supply is converted into a DC voltage. Then, DC power may be supplied to another explosion-proof power supply device, or DC power supplied from an internal power supply may be supplied to another explosion-proof power supply device. The other explosion-proof power supply device may have a structure different from that of the explosion-proof power supply device.

DESCRIPTION OF SYMBOLS 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 Operation means 8 Operated means 8a Switching means selection magnetic sensor 8b Supply switching magnetic sensor 8c Shutoff switching magnetic sensor 9 Display means 10 Other explosion-proof power supply D External equipment

Claims (5)

An explosion-proof power supply that supplies power to external equipment,
A switching means for switching between supply and interruption of power from the power source to the external device;
A control means for controlling the switching means upon receiving an instruction from an operating means provided independently outside the apparatus;
Provided inside the device,
Explosion-proof power supply. The explosion-proof power supply device according to claim 1, wherein the power supply is an external power supply. The explosion-proof power supply device according to claim 1 or 2, further comprising voltage conversion means for converting an AC voltage supplied from the power source into a DC voltage. A plurality of the switching means are provided,
Each of the plurality of switching means is configured to be capable of switching between power supply and cutoff 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 power supplied from the power supply can be supplied to another explosion-proof power supply device.

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