JP2013008551A - Explosion-proof electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an explosion-proof electric apparatus capable of attaining miniaturization and lightness of the apparatus and sufficiently supplying power to an intrinsically-safe circuit by reducing wiring inductance and capacitance between the intrinsically-safe circuit and an intrinsically-safe related circuit at a negligible state.SOLUTION: A intrinsically-safe circuit section 1 for internally storing an LED board 11 and an intrinsically-safe related circuit section 2 with a resin filled explosion-proof structure for internally storing cables 25, a power source 21, and the intrinsically-safe circuit 22 are detachably arranged in the explosion-proof electric apparatus. A first connection section 15 and a second connection section 23 are exposed to respective attaching and detaching surfaces of the intrinsically-safe circuit section 1 and the intrinsically-safe related circuit section 2. The first connection section 15 and the second connection section 23 are electrically connected each other, and the intrinsically-safe circuit section 1 and the intrinsically-safe related circuit section 2 are also combined.

Description

  The present invention relates to an explosion-proof electrical device that is installed in a hazardous area, such as an explosion-proof lighting device.

  Even in a hazardous area with an explosive gas atmosphere such as a petrochemical plant, lighting may be required when working in a dark place or at night. When a discharge lamp such as a fluorescent lamp or an HID lamp is used as a light source for an explosion-proof lighting device used in a hazardous area, devices such as a starter, an ignition device and a ballast are required, and the configuration becomes large and large. Requires power consumption.

  Therefore, an explosion-proof illumination device using an LED as a light source has been proposed (for example, see Patent Document 1). The LED light source and the branch cable for introducing a power source are accommodated in a container having a pressure and explosion proof structure.

JP 2005-093246 A

  However, in the conventional explosion-proof illumination device, there is a problem that the apparatus becomes large and heavy when the LED light source, the power supply circuit, and the like are housed in a flameproof explosion-proof container. In addition, when an intrinsically safe explosion-proof structure is used as an explosion-proof structure, the safety device (all of the circuit is the safety circuit (sparks or heat generated in normal and specific failure conditions will ignite the target explosive gas atmosphere). LED light source, which is an electrical device made up of non-circuits.) Can be installed in hazardous areas, but the safety-related devices (the safety-related circuits (both the safety circuit and the non-safety circuit) Electrical equipment) that is configured with a circuit that does not have the possibility of the non-safety circuit having an adverse effect on the safe circuit) cannot be installed in the hazardous area, and must be installed in the non-hazardous area. There is. Therefore, the wiring inductance and capacitance between the LED light source (the present safety circuit) and the present safety related device (the present safety related circuit) are increased, the current value is limited by the conditions of the intrinsically safe explosion-proof structure, and a sufficient amount of light is obtained. There is a problem that can not be. Such a problem is not limited to explosion-proof lighting equipment, but is a general problem for explosion-proof electrical equipment having an intrinsically safe explosion-proof structure.

  The object of the present invention is to reduce the size and weight of the device, and to reduce the wiring inductance and capacitance between the safety circuit and the safety related circuit to a negligible level so that sufficient power is supplied to the safety circuit. The object is to provide explosion-proof electrical equipment that can be supplied.

  The explosion-proof electrical device according to the present invention includes a safety circuit portion, a safety related circuit portion, and a coupling member. The main safety circuit unit houses the main safety circuit therein and includes a first connection part for supplying power to the main safety circuit. The safety related circuit unit is a safety related circuit in which a second connection part is electrically connected, and is electrically connected to the safety circuit via the second connection part and the first connection part. The connected safety circuit is housed inside and has a predetermined explosion-proof structure. The coupling member detachably couples the safety circuit portion and the safety related circuit portion so that the first surface of the safety safety circuit portion faces the second surface of the safety safety related circuit portion.

  According to this configuration, the safety circuit portion storing the safety circuit and the safety circuit portion having a predetermined explosion-proof structure storing the safety related circuit are detachable.

  In this configuration, the predetermined explosion-proof structure can be a resin-filled explosion-proof structure or a pressure-proof explosion-proof structure. In addition, the specified explosion-proof structure may be a safety explosion-proof structure, the safety related circuit shall be a resin-filled explosion-proof structure, and the safety explosion-proof terminal block may be provided on the non-safety circuit side of the safety related circuit. it can.

  Moreover, it is preferable that this safety related circuit part is provided with the power supply connected to a safety related circuit. In this case, the power source can be a resin-filled explosion-proof structure, and a terminal block having a safety explosion-proof structure can be provided on the input side and output side of the power source.

  Furthermore, when the safety circuit is composed of LEDs, the safety circuit section includes a window portion that distributes light emitted from the LEDs to the outside on a surface facing the first surface. be able to.

  In addition, a connection member for electrically connecting the first connection portion and the second connection portion is provided, and the coupling member is a safety circuit portion on the first end side in the first surface and the second surface. And a safety member related circuit part and a hinge that supports the first and second surfaces in a separable and rotatable manner, and a fastening member that fastens the second end side of the first surface and the second surface to each other. It is preferable to arrange the connecting portion and the second connecting portion on the first end side.

  According to the present invention, the device can be reduced in size and weight, and the wiring inductance and capacitance between the safety circuit and the safety related circuit can be reduced to a negligible level, and sufficient power can be supplied to the safety circuit. Can supply.

1 is a partially broken perspective view of an explosion-proof electrical device according to an embodiment of the present invention. It is a block diagram of the safety related circuit of the explosion-proof electrical device. (A) And (B) is a figure which shows the example of the attachment or detachment state of the safety circuit part and this safety related circuit part in the explosion-proof electrical equipment. (A)-(C) are figures which show the example of the connection part of the explosion-proof electrical equipment which concerns on embodiment of this invention. (A)-(C) are block diagrams which show the example of the connection state of the explosion-proof type electric equipment which concerns on embodiment of this invention. (A)-(C) are block diagrams of the explosion-proof electrical equipment which concerns on another embodiment of this invention.

  Hereinafter, an explosion-proof electrical device according to an embodiment of the present invention will be described with reference to the drawings, taking an explosion-proof illumination device as an example.

  As shown in FIG. 1, the explosion-proof lighting device 10 includes a safety circuit portion 1 and a safety related circuit portion 2. The main circuit portion 1 has a substantially rectangular parallelepiped shape and houses two LED boards 11 as an example. As an example, each LED substrate 11 is mounted with eight LEDs 12 arranged in two rows along the longitudinal direction together with the lens 13.

  The upper surface 1A is provided with a window portion 14 made of a translucent plate material such as glass. The window 14 faces the lens 13 and distributes the light emitted from the LED 12 to the outside. The first connection portion 15 electrically connected to the LED substrate 11 is exposed on the bottom surface 1B side.

  The safety circuit portion 1 accommodates only the LED substrate 11 on which the LED 12 with low power consumption is mounted, and is not required to have impact resistance according to the explosion-proof standard, and can be configured in a small size.

  The safety related circuit unit 2 has a substantially rectangular parallelepiped shape and accommodates the cable 25, the power source 21, and the safety related circuit 22 in an electrically connected state. The interior of the safety related circuit portion 2 is exposed from the side surface 2B perpendicular to the upper surface 2A, with the second connection portion 23 electrically connected to the safety related circuit 22 exposed to the upper surface 2A side. In this state, the resin 24 is filled so as to cover the periphery of the cable 25, the power source 21, and the safety related circuit 22, and a resin-filled explosion-proof structure is formed. By making the safety related circuit portion 2 into a resin-filled explosion-proof structure, the explosion-proof lighting device 10 is set to zone 0 (a place where an explosive atmosphere exists continuously or for a long time or frequently in a normal state). It can be installed in all hazardous areas including A gap is provided between the upper surface of the resin 24 and the upper surface 2A of the safety related circuit portion 2, and the second connection portion 23 is exposed in this gap. The cable 25 is electrically connected to the power source 21 in the safety related circuit unit 2.

  In addition, the 1st connection part 15 and the 2nd connection part 23 can be comprised with a connector as an example.

  As an example, the power source 21 is supplied with AC power (for example, AC 100 V) on the input side, and outputs DC power (for example, DC 24 V) from the output side. By supplying DC power from an external power source to the explosion-proof lighting device 10, the power source 21 can be omitted. However, an AC power supply is generally used as the external power supply. If the power consumption is the same, the current consumption decreases as the voltage increases. Therefore, it is more efficient to use the internal power supply 21.

  The safety circuit portion 1 and the safety circuit portion 2 have the same planar shape, and the bottom surface (first surface) 1B of the safety circuit portion 1 and the upper surface (second surface) of the safety circuit portion 2 The surface 2) is detachably coupled to the surface 2A.

  As shown in FIG. 2, the safety related circuit 22 includes a constant voltage control circuit 222, a fuse from the input side connected to the non-safety circuit (for example, the power supply 21) toward the output side connected to the safety circuit. 221, a voltage limiting circuit 223 and a current limiting circuit 228 are provided.

  The voltage limiting circuit 223 is configured by connecting a shunt voltage limiting circuit 223B and a voltage detection circuit 223C in parallel with the output short circuit 223A, respectively, between the power supply lines for the safety circuit. The output short circuit 223A is made of, for example, a semiconductor such as a thyristor, and has an input terminal connected between the shunt voltage limiting circuit 223B and the voltage detection circuit 223C, and receives the detection voltage input from the voltage detection circuit 223C. The output short circuit 223A shorts between the power supply lines when the detected voltage exceeds a predetermined operating voltage, and prevents the output voltage exceeding the reference voltage from being output to the safety circuit. The shunt voltage limiting circuit 223B is configured by, for example, a Zener diode, and maintains the voltage between both ends at a Zener voltage that is a constant voltage.

  When the output voltage, which is the voltage between the power supply lines, varies, the voltage of the voltage detection circuit 223C varies, and the detection voltage input to the input terminal of the output short circuit 223A varies. That is, the detection voltage input to the output short circuit 223A is a value obtained by subtracting the Zener voltage (limit voltage) from the output voltage. The voltage detection circuit 223C is configured by a resistor, for example, and indirectly detects the output voltage as a detection voltage obtained by subtracting the limit voltage from the output voltage.

  The fuse 221 is provided based on a standard requirement for the voltage limiting circuit 223. The current limiting circuit 228 is configured by a resistor, for example, and limits the output current value supplied to the safety circuit to a current value or less determined by the standard.

  The constant voltage control circuit 222 includes a voltage control circuit 222A, a feedback resistor 222B, a reference voltage circuit 222C, and a voltage error amplification circuit 222D. The detection voltage of the voltage detection circuit 223C in the voltage limiting circuit 223 is input to the voltage error amplification circuit 222D via the feedback resistor 222B. The voltage error amplifier circuit 222D compares the detection voltage input via the feedback resistor 222B with a reference voltage generated by the reference voltage circuit 222C, and supplies a differential voltage signal obtained by amplifying the difference between the two to the voltage control circuit 222A. The voltage control circuit 222A controls the output voltage based on the differential voltage signal from the voltage error amplification circuit 222D. Feedback control is performed so that the output voltage indirectly detected by the voltage detection circuit 223C matches the reference voltage.

  As shown in FIG. 3 (A), the safety circuit portion 1 and the safety related circuit portion 2 are formed with locking claws 16 and locking grooves 26 as coupling members of the present invention at four locations as an example. Has been. After the locking claw 16 is inserted into the interior of the safety related circuit portion 2 from the upper surface 2A, the safety circuit portion 1 is moved in the horizontal direction relative to the safety related circuit portion 2, thereby The part 1 and the safety related circuit part 2 are detachably coupled.

  In the safety related circuit portion 2, a gap is formed between the upper surface 2A and the resin 24, and the first connection portion 15 and the second connection portion 23 are electrically connected in the gap. The cable 5 is stored. The cable 5 corresponds to the connecting member of the present invention.

  As shown in FIG. 3 (B), the hinge 3 disposed on one end side of each of the bottom surface 1B of the safety circuit portion 1 and the top surface 2A of the safety related circuit portion 2 and the other end portion side. The safety circuit portion 1 and the safety related circuit portion 2 can be detachably coupled via the set screw 4. The hinge 3 and the set screw 4 correspond to the coupling member of the present invention.

  The hinge 3 supports the safety circuit portion 1 and the safety related circuit portion 2 so as to be separable and rotatable. After the main safety circuit portion 1 and the main safety related circuit portion 2 are rotatably supported via the hinge 3, the first connection portion 15 and the second connection portion 23 are electrically connected via the cable 5. Connecting. The first connecting portion 15 and the second connecting portion 23 are arranged close to the end portions where the hinges 3 are arranged on the bottom surface 1B and the top surface 2A, thereby shortening the cable 5 and wiring. Inductance and capacitance can be reduced.

  As shown in FIG. 4A, one of the first connection portion 15 and the second connection portion 23 may be a plug shape and the other may be a socket shape. Further, as shown in FIGS. 4B and 4C, one of the first connection portion 15 and the second connection portion 23 may be formed of an elastic member that presses against the other. When the safety circuit part 1 and the safety related circuit part 2 are combined, the first connection part 15 and the second connection part 23 are electrically connected to each other by mechanical contact, and connected. The member can be omitted.

  As shown in FIG. 5, the amount of illumination light can be increased by connecting a plurality of explosion-proof illumination devices. When the amount of illumination light is increased in all dangerous places including zone 0, as shown in FIG. 5 (A), a plurality of explosion-proof lighting devices 10 are connected using screws or slide mechanisms, and each explosion-proof type. Each of the cables 25 of the lighting device 10 is connected to an external power source.

  Zone 1 (places that can often create explosive atmospheres under normal conditions) or Zone 2 (less likely to produce explosive atmospheres under normal conditions and lasts only a short time even if generated) In the case where the amount of illumination light is increased at a place not to be used, the explosion-proof illumination device 110 having the configuration shown in FIG. 6A can be connected as shown in FIG. The safety-related circuit portion 2 of the explosion-proof lighting device 110 has a safety-explosion-proof structure, and the power supply 21 and the safety-related circuit 22 are individually made into a resin-filled explosion-proof structure in the safety-related circuit portion 2, and the cable 25, power supply 21 and the safety related circuit 22 are connected by terminal blocks 30 to 32 having a safety explosion-proof structure. Note that the terminal block 33 on the output side (the safety circuit side) of the safety circuit 22 does not need to have a safety explosion-proof structure.

  Similarly, in zone 1 and zone 2, the explosion-proof lighting device 120 shown in FIG. 6B and the explosion-proof lighting device 130 shown in FIG. 6C are connected as shown in FIG. 5C. You can also. As with the explosion-proof lighting device 120, the safety-related circuit portion 2 of the explosion-proof lighting device 130 has a safety-increasing structure, and the safety-related circuit 22 inside the safety-related circuit portion 2 has a resin-filled explosion-proof structure. The terminal block 32 is a terminal block with a safety explosion-proof structure.

  In the explosion-proof illumination devices 110 to 130, since each wiring is detachable from the terminal blocks 30 to 33, the degree of freedom of wiring is improved.

  The safety related circuit unit 2 may have a pressure-proof explosion-proof structure.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1-Honan circuit part 2-Honan related circuit part 5-Cable (connection member)
10-Explosion-proof lighting equipment 11-LED board (this safety circuit)
12-LED
15-first connection portion 16-locking claw (coupling member)
21-Power supply 22-Honan related circuit 23-Second connection part 24-Resin 26-Locking groove (coupling member)

Claims (8)

A main safety circuit portion that houses the main safety circuit and includes a first connection portion for supplying power to the main safety circuit;
A safety related circuit in which a second connection portion is electrically connected and is electrically connected to the safety circuit through the second connection portion and the first connection portion. And a safety circuit related to the specified explosion-proof structure,
A coupling member that detachably couples the safety circuit portion and the safety circuit portion with the first surface of the safety circuit portion facing the second surface of the safety circuit portion; ,
Explosion-proof electrical equipment.   The explosion-proof electrical device according to claim 1, wherein the predetermined explosion-proof structure is a resin-filled explosion-proof structure.   The explosion-proof electrical device according to claim 1, wherein the predetermined explosion-proof structure is a pressure-proof explosion-proof structure.   The predetermined explosion-proof structure is a safety-explosion-proof structure, the safety-related circuit is a resin-filled explosion-proof structure, and a terminal block having a safety-explosion-proof structure is provided on the non-safety circuit side of the safety-related circuit. 1. Explosion-proof electrical equipment described in 1.   The explosion-proof electrical device according to any one of claims 1 to 3, further comprising a power source connected to the safety related circuit in the safety related circuit unit.   The safety related circuit unit further includes a power source connected to the safety related circuit, the power source is made of a resin-filled explosion-proof structure, and a terminal block having a safety explosion-proof structure is provided on the input side and the output side of the power source. The explosion-proof electrical device according to claim 4. The safety device is composed of LEDs,
The explosion-proof electrical device according to any one of claims 1 to 6, wherein the safety circuit portion includes a window portion that distributes the light emitted from the LED to the outside on a surface facing the first surface. . A connection member for electrically connecting the first connection portion and the second connection portion;
The coupling member includes a hinge that supports the safety circuit portion and the safety related circuit portion separably and rotatably on the first end side of the first surface and the second surface, respectively. A fastening member that fastens the second end side of the first surface and the second surface to each other;
The explosion-proof electrical device according to any one of claims 1 to 7, wherein the first connection portion and the second connection portion are disposed on the first end portion side.

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