JP4929510B2 - Explosion-proof wireless power supply - Google Patents

Description

  The present invention relates to an explosion-proof non-contact power feeding device that feeds electric equipment in a hazardous area in a non-contact state.

  As a self-propelled vehicle that travels along a predetermined movement route, there is an electric self-propelled vehicle that receives power supply from a rail arranged along the movement route in a non-contact manner. Electric self-propelled vehicles are used, for example, for transporting parts in factories.

An electric self-propelled vehicle is equipped with a non-contact power feeding device including a coil and electrical components, and the magnetic energy generated in the coil by electromagnetic induction between the power feeding line in the rail to which a high-frequency current is supplied is supplied to an electric power such as a capacitor It converts into electric power through components and drives power sources, such as a motor (for example, refer to patent documents 1). The coil needs to be disposed close to the rail, and is wound around the iron core having a U-shaped cross-section straddling the rail and stored in the coil storage portion. Electrical components such as capacitors other than the coils are stored in the electrical component storage unit.
JP 2002-320347 A

  However, there are cases where mechanical equipment that supplies parts carried by an electric self-propelled vehicle is installed in a hazardous area such as a flammable gas atmosphere. None of the parts had an explosion-proof structure.

  The object of the present invention is to allow the coil storage part and the electrical part storage part to have an explosion-proof structure without increasing the cost and the complexity of the structure leading to an increase in the size of the apparatus, and can be used in a hazardous area. An object of the present invention is to provide an explosion-proof non-contact power feeding device.

  As means for solving the above-described problems, the explosion-proof non-contact power feeding device of the present invention includes a coil housing portion and an electrical component housing portion. The coil storage unit has a safety explosion-proof structure and stores the coil. The electrical component storage unit has a pressure explosion-proof structure or an internal pressure explosion-proof structure, and stores electrical components.

  Among the explosion-proof structures, the explosion-proof structure is designed to withstand the explosion pressure and prevent the flame from explosion from igniting the gas outside the container when the gas that has entered the container explodes. It is required for a container for storing electrical equipment that can be a source. The internal pressure explosion-proof structure is a structure in which a positive pressure is applied to the inside of the container by a protective gas such as air, nitrogen gas, or carbon dioxide gas so that an external atmosphere does not enter the container. The safety explosion-proof structure improves the insulation performance of electrical equipment that is not likely to become an ignition source during normal operation, and prevents damage due to temperature rise and external force. It is a simpler structure than the structure.

  In the configuration of the present invention, the coil that does not serve as an ignition source is housed in the storage section of the safety explosion-proof structure, and the electrical component that becomes the obvious ignition source is housed in the storage section of the pressure-proof explosion-proof structure or the internal pressure explosion-proof structure. Each of the two storage units having different storage items has a structure corresponding to the danger level of the storage items, and necessary and sufficient safety is maintained.

  The structure of this invention WHEREIN: You may further provide the terminal storage part of a safe explosion-proof structure. The terminal storage unit incorporates a terminal block for electrical connection between the coil and the electrical component. Even when the coil stored in the coil storage unit and the electrical component stored in the electrical component storage unit are electrically connected by the terminal block stored in the terminal storage unit, the structure is not complicated. It is possible to prevent an increase in cost and an increase in size of the apparatus.

  The coil storage unit, terminal storage unit, and electrical component storage unit may be integrally connected in this order, and the terminal storage unit is connected integrally with the coil storage unit, and the electrical component storage unit is stored in the terminal box. May be.

  Furthermore, the coil storage portion may be partially filled with resin by providing a space. Without interfering with electromagnetic induction of the coil, the insulation performance of the coil can be maintained, the coil can be fixed inside the coil housing portion, and the coil housing portion can have a safety explosion-proof structure.

  According to the present invention, the coil storage part and the electrical component storage part have a structure capable of maintaining necessary and sufficient safety according to the risk of each stored item, resulting in an increase in cost and an increase in the size of the apparatus. An explosion-proof structure can be obtained without complicating the structure.

  FIG. 1 is a diagram showing a schematic configuration of an explosion-proof contactless power supply device according to an embodiment of the present invention. An explosion-proof contactless power supply device 10 according to the present invention includes a coil storage unit 1, a terminal storage unit 2, and an electrical component storage unit 3.

  The coil storage part 1 is a resin-made container which exhibits a substantially U-shaped cross section as an example. The rail 20 is located in the recess in the cross section of the coil storage unit 1. The terminal accommodating part 2 is a metal housing as an example. The electrical component storage unit 3 is a flameproof container, and includes an electrical component storage box 3C and a terminal box 3D, each having an independent pressure-proof structure. The coil storage unit 1 is integrally attached to the terminal storage unit 2. The terminal storage unit 2 and the electrical component storage unit 3 are connected by a cable 4.

  The rail 20 is disposed along a predetermined movement route on which the electric self-propelled vehicle should travel in a dangerous area such as a factory in an explosive gas atmosphere.

  The electrical component storage unit 3 stores electrical components such as a capacitor that become an apparent ignition source. For this reason, the electrical component storage unit 3 is a general explosion-proof explosion-proof container, and includes a pressure-proof explosion-proof structure retracting device 3 </ b> A including a pressure-proof packing through which the cable 4 penetrates a part of the wall surface. The electrical component storage unit 3 includes another pull-in metal fitting 3B (pressure-resistant explosion-proof structure) through which a cable for connecting the electrical component to a load device such as a motor passes.

  FIG. 2 is a cross-sectional view of a main part of the explosion-proof contactless power feeding device of the present invention. The coil storage unit 1 stores a pickup coil 5 and an iron core 6 therein. The pickup coil 5 is a coil according to the present invention wound around an iron core 6 and generates magnetic flux by electromagnetic induction between the rail 20 and a power supply line 21 that is supplied with a high-frequency current.

  The pick-up coil 5 and the iron core 6 do not generate sparks or arcs during normal operation and energization, and do not become a high temperature. For this reason, the coil accommodating part 1 can be made into a safe explosion-proof structure. Therefore, the inside of the coil storage portion 1 stores the pickup coil 5 and the iron core 6, and then is provided with a space 11 in a part and filled with the resin 1 </ b> A. The resin 1A improves the insulation performance of the pickup coil 5 and the iron core 6, and prevents danger due to temperature rise and damage due to external force.

  Moreover, since the coil storage part 1 is provided with the space 11 and filled with resin, it does not have a resin-filled explosion-proof structure. For this reason, the coil storage part 1 does not need to satisfy the complicated standard requirements of the resin-filled explosion-proof structure.

  Since the pickup coil 5 is covered with the resin 1A in the coil housing part 1 of the resin casing, the pickup coil 5 is fixed without being disturbed by electromagnetic induction with the power supply line 21.

  The coil housing part 1 does not necessarily have a safety explosion-proof structure by filling the resin 1A. On the condition that the electromagnetic induction between the pickup coil 5 and the feeder line 21 is not hindered, the coil housing part 1 can be made into a safety explosion-proof structure by an arbitrary method. Moreover, the pickup coil 5 wound around the iron core 6 at the time of resin molding of the coil housing portion 1 can also be inserted.

  The terminal storage part 2 is a metal housing as an example, and stores the terminal block 7 and the terminal box 8. The coil storage unit 1 is fixed to the terminal storage unit 2 via mounting screws 12. The inside of the coil housing part 1 and the inside of the terminal housing part 2 communicate with each other through communication holes 13 and 14. A wiring 15 having one end connected to the pickup coil 5 passes through the communication holes 13 and 14. A part of the wall surface of the terminal storage unit 2 is provided with a retractable device 9 having a pressure-proof explosion-proof structure including a pressure-resistant packing. The retracting device 9 does not necessarily have a pressure-proof explosion-proof structure, and may have a safety explosion-proof structure. The cable 4 passes through the pressure-resistant packing of the retracting device 9.

  The terminal block 7 electrically connects the wiring 15 and the cable 4. The terminal box 8 is a casing made of a metal flat plate and houses the terminal block 7. Since the terminal block 7 does not generate sparks or arcs during normal operation and energization, and does not become high temperature, there is no possibility of becoming an ignition source. For this reason, the terminal accommodating part 2 can be made into a safety explosion-proof structure. Therefore, the terminal storage unit 2 stores the terminal block 7 in a state of being surrounded by the terminal box 8. The terminal box 8 improves the insulation performance of the terminal block 7 and prevents danger due to temperature rise and damage due to external force.

  The terminal housing portion 2 has an opening on the opposite side of the surface facing the mounting surface of the coil housing portion 1, and includes a lid 2A that closes the opening. The lid body 2A is fixed to the terminal storage portion 2 together with the flange portion 8A of the terminal box 8 via a fixing screw 31 having a locking structure.

  With the above configuration, the coil storage unit 1 and the electrical component storage unit 3 have a structure capable of maintaining necessary and sufficient safety according to the risk of each stored item, thereby increasing the cost and the size of the device. An explosion-proof structure can be obtained without complicating the structure to be invited.

  The electrical component storage unit 3 may have an arbitrary explosion-proof structure, such as an internal pressure explosion-proof structure, on the condition that a predetermined explosion-proof performance can be satisfied even when an electrical component that becomes an obvious ignition source such as a capacitor is stored. it can. Moreover, the terminal storage part 2 can be stored in the terminal storage part 2 by making the terminal storage part 2 into a pressure-proof explosion-proof structure.

  FIG. 3 is a cross-sectional view of an explosion-proof contactless power supply device according to another embodiment of the present invention. The explosion-proof non-contact power feeding device 110 according to this embodiment is configured by integrally mounting an electrical component storage unit 301 on the bottom surface of the terminal storage unit 2. The electrical component storage unit 301 is a container having a pressure-proof explosion-proof structure. As an example, the electrical component storage unit 301 is fixed to the terminal storage unit 2 together with the lid body 2 </ b> A and the terminal box 8 via the L-shaped metal fitting 32 with a fixing screw 31. Thereby, in the explosion-proof non-contact power feeding apparatus 110, the coil storage unit 1, the terminal storage unit 2, and the electrical component storage unit 301 are integrally connected in this order.

  The electrical component storage unit 301 stores electrical components such as a capacitor 302. A terminal box 8 is disposed in the terminal storage portion 2. Terminal blocks 7 and 305 are accommodated in the terminal box 8. The terminal block 7 connects the wiring 15 connected to the pickup coil 5 and the input wiring 311 connected to the capacitor 302. The terminal block 305 connects the output wiring 312 connected to the capacitor 302 and the external wiring 313.

  The interior of the electrical component storage unit 301 communicates with the interior of the terminal box 8 via the wiring lead-in member 303. An input wiring 311 and an output wiring 312 pass through the wiring drawing member 303. The external wiring 313 is exposed to the outside of the terminal storage portion 2 through the retractable device 304 having a pressure-proof explosion-proof structure. Note that the lead-in metal fitting 304 may have a safety explosion-proof structure like the pull-in device 9.

  The electrical component storage unit 301 has an opening on the surface opposite to the surface facing the mounting surface of the lid 2A, and includes a lid 321 that closes the opening. The lid 321 is fixed to the electrical component storage unit 301 by a fixing screw 322 having a locking structure.

  In this configuration, the terminal block 305 can be stored together with the terminal block 7 in the terminal box 8 in the terminal storage unit 2, and the terminal box to be provided in the electrical component storage unit 301 can be made unnecessary. In addition, a capacitor 302 that forms a resonance circuit together with the pickup coil 5 can be disposed close to the pickup coil 5.

  FIG. 4 is a cross-sectional view of an explosion-proof contactless power supply device according to still another embodiment of the present invention. The explosion-proof contactless power supply device 120 according to this embodiment extends a central portion of a lid 421 that closes the bottom surface of the terminal storage portion 2 downward, and an electrical component storage portion 401 is disposed in the extended portion. It is configured. The electrical component storage unit 401 is a container having a pressure-proof explosion-proof structure, and is fixed through an L-shaped metal fitting 432 attached to the lid 421 with a fixing screw 431 as an example. As a result, in the explosion-proof non-contact power feeding device 120, the terminal storage unit 2 is integrally connected to the coil storage unit 1, and the electrical component storage unit 401 is stored in the terminal box 8.

  The electrical component storage unit 401 stores electrical components such as the capacitor 402. The terminal box 8 houses the terminal blocks 7 and 407. The terminal block 7 connects the wiring 15 connected to the pickup coil 5 and the input wiring 411 connected to the capacitor 402. The terminal block 407 connects the wiring 15 connected to the pickup coil 5, the output wiring 412 connected to the capacitor 402, and the external wiring 413.

  The inside of the electrical component storage unit 401 communicates with the inside of the terminal box 8 via the wiring drawing member 403. An input wiring 411 and an output wiring 412 pass through the wiring drawing member 403. The external wiring 413 is exposed to the outside of the terminal storage unit 2 via the retracting device 405. The retracting device 405 may have a safety explosion-proof structure like the retracting device 9.

  The electrical component storage unit 401 has an opening on a surface opposite to the surface facing the inner surface of the lid 421, and includes a lid 441 that closes the opening. The lid 441 is fixed to the electrical component storage unit 401 by a fixing screw 442.

  Even in this configuration, the capacitor 402 that constitutes a resonance circuit together with the pickup coil 5 can be disposed close to the pickup coil 5.

  In addition, since the electrical component storage unit 401 is stored in the terminal box 8 that is closed with a locking structure, the fixing screw 442 need not have a locking structure, and the structure of the electrical component storage unit 401 is simplified. As a result, the electrical component storage unit 401 can be reduced in weight and size, and the cost can be reduced, leading to reduction in the weight and size of the explosion-proof non-contact power feeding device itself and cost.

  FIG. 5 is a plan view and a cross-sectional view of a wiring drawing member used in the explosion-proof non-contact power feeding device shown in FIGS. 3 and 4. The wiring drawing member 303 shown in FIG. 3 is a resin fixing metal fitting and includes guide plates 331 and 341 therein. The guide plate 331 has a disk shape made of resin. In the guide plate 331, an injection hole 332 is formed at the center, and a plurality of wiring holes 333 are formed around the injection hole 332. The guide plate 341 has a disk shape made of resin. The guide plate 341 is formed with a plurality of wiring holes 342 that face the wiring holes 333 of the guide plate 331.

  The wiring drawing member 303 is fixed by screwing a nut 340 after screwing into a predetermined screw hole. In this state, the wiring is made to pass through the wiring holes 333 and 342, and then the resin 350 is filled into the inside from the injection hole 332.

  Since the inside of the wiring drawing member 303 is filled with resin after the wiring penetrates, the explosion-proof performance is maintained on both sides of the wiring drawing member 303.

  The wiring drawing member 403 shown in FIG. 4 can also be configured in the same manner as the wiring drawing member 303.

  The above embodiments are merely examples, and the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present invention.

It is a figure which shows the structure of the outline of the explosion-proof non-contact electric power feeder which concerns on embodiment of this invention. It is sectional drawing of the principal part of the explosion-proof non-contact electric power feeder of this invention. It is sectional drawing of the explosion-proof non-contact electric power feeder which concerns on another embodiment of this invention. It is sectional drawing of the explosion-proof non-contact electric power feeder which concerns on another embodiment of this invention. It is the top view and sectional drawing of the wiring drawing-in member used for the explosion-proof non-contact electric power feeder shown in FIG.3 and FIG.4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil accommodating part 2 Terminal accommodating part 3 Electrical component accommodating part 3, 3B, 9 Retraction instrument 5 Pickup coil (coil)
7 Terminal block 8 Terminal box 20 Rail 21 Feed line

Claims (5)

A coil storage unit for storing the coil, and an electrical component storage unit for storing the electrical component,
An explosion-proof non-contact power feeding device in which the coil housing portion has a safety explosion-proof structure and the electrical component housing portion has a pressure-proof explosion-proof structure or an internal pressure explosion-proof structure.   2. The explosion-proof non-contact type according to claim 1, further comprising a terminal housing part having a safety explosion-proof structure, wherein a terminal box containing a terminal block for electrically connecting the coil and the electrical component is housed in the terminal housing part. Power supply device.   The explosion-proof non-contact power feeding device according to claim 2, wherein the coil housing portion, the terminal housing portion, and the electrical component housing portion are integrally connected in this order.   The explosion-proof non-contact power feeding device according to claim 2, wherein the terminal housing portion is integrally connected to the coil housing portion, and the electrical component housing portion is housed in the terminal box.   The explosion-proof non-contact power feeding device according to any one of claims 1 to 4, wherein the coil housing portion is partially filled with resin with a space.

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