JP5163961B2 - Electrical equipment - Google Patents

Description

  The present invention relates to an electric device, and more particularly, to an electric device that controls an object disposed in a casing that blocks electromagnetic waves.

  Conventionally, in an electromagnetically shielded room or building, electromagnetic waves generated in the room or building leak to the outside via cables such as power cables and signal lines that penetrate the electromagnetic shield layer of the room or building. And the electromagnetic wave leakage prevention structure which prevents that external electromagnetic waves penetrate | invade indoors is proposed (for example, refer patent document 1). Further, a waterproof structure of a cable lead-in portion that pulls a connection cable into the case body has been proposed (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 5-21981 JP 2002-44837 A

  In the electromagnetic wave leakage prevention structure described in Patent Document 1, the electromagnetic wave propagated to the electromagnetic shield layer can be shielded, but the electromagnetic wave propagated via the core wire of the shielded cable cannot be shielded, and the room or building There was a problem that electromagnetic waves leaked inside.

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide an electric device that can suppress leakage of electromagnetic waves into a casing that blocks electromagnetic waves.

  An electric device according to the present invention includes a casing that blocks electromagnetic waves, a box that blocks electromagnetic waves, and a control unit that controls an object disposed in the casing. The box is arranged in the housing. The control unit is arranged in the box. A hollow cylindrical member that communicates the inside and outside of the box is provided on the box. The electric device further includes a signal line made of an insulating material and a wiring. The signal line connects the control unit and the object. The wiring connects a power source and a control unit arranged outside the casing. The signal line is disposed through the inside of the cylindrical member. The wiring is arranged via a first filter attached to the housing and a second filter attached to the box.

  Preferably, the electric device includes a pipe portion made of an insulating material. A pipe part connects a control unit and a target object, and a working fluid for operating a target distribute | circulates. The tube portion is disposed through the inside of the cylindrical member.

  Preferably, the electric device includes another signal line made of an insulating material. The other signal lines connect the electric device arranged outside the housing and the control unit. The casing is provided with other hollow cylindrical members that communicate with the inside and outside of the casing. The other signal lines are disposed through the inside of the cylindrical member and the other cylindrical member.

  According to the electric device of the present invention, leakage of electromagnetic waves from the control unit to the internal space of the housing can be suppressed.

It is a schematic diagram which shows the structure of the electric apparatus which concerns on one embodiment of this invention. It is a perspective view which shows the structure of a box. It is a block diagram which shows the example of a connection of a control unit and a target object.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  In the embodiments described below, each component is not necessarily essential for the present invention unless otherwise specified. In the following embodiments, when referring to the number, amount, etc., unless otherwise specified, the above number is an example, and the scope of the present invention is not necessarily limited to the number, amount, etc.

  FIG. 1 is a schematic diagram showing a configuration of an electric device 1 according to an embodiment of the present invention. As shown in FIG. 1, the electric device 1 includes a housing 30. The housing 30 partitions the space 9 outside the housing 30 and the space 39 inside the housing 30, and separates the space 39 from the space 9. The housing 30 is formed of a conductive plate member. The casing 30 surrounding the space 39 blocks unnecessary electromagnetic waves from entering the space 39 from the space 9. The space 39 is formed as a shield room surrounded by walls, ceilings, and floors that do not transmit electromagnetic waves and shielded (shielded) from the electromagnetic waves.

  A box 20 is arranged in a space 39 in the housing 30. The box 20 partitions the space 29 inside the box 20 and the space 39, and separates the space 39 from the space 29. The box 20 is formed of a conductive plate member. The box 20 suppresses the electromagnetic wave generated in the space 29 inside the box 20 from leaking to the space 39 outside the box 20. The box 20 has a function as a shield box that blocks the propagation of electromagnetic waves from the space 29 to the space 39.

  The control unit 10 is disposed in a space 29 in the box 20. The box 20 accommodates the control unit 10, and the control unit 10 is disposed in the box 20. The control unit 10 controls the object 40. Specifically, the object 40 is disposed in a space 39 inside the housing 30 and outside the box 20. The control unit 10 is connected to the object 40 by a signal line 51, and controls or monitors the object 40 by transmitting a control signal to and from the object 40.

  The signal line 51 that connects the control unit 10 and the object 40 is made of an insulating material. Typically, the signal line 51 is an optical fiber having a fibrous glass or resin material as a medium, and has a signal transmission capability when light is transmitted through the medium by total reflection or refraction.

  The box 20 is provided with a hollow cylindrical member 21 that communicates the inside and outside of the box 20. The cylindrical member 21 communicates a space 29 inside the box 20 and a space 39 outside the box 20. The signal line 51 is disposed through the inside of the cylindrical member 21.

  FIG. 2 is a perspective view showing the configuration of the box 20. As shown in FIG. 2, the box 20 has a ceiling part 24a, a floor part 24b, and a wall part 24c formed of a plate member made of a conductive material such as metal. The ceiling part 24a, the floor part 24b and the wall part 24c can be formed, for example, by forming a steel material and galvanizing it. Mounting feet 27 are provided so as to protrude downward from the floor 24b.

  The box 20 also includes a lid portion 25 that is an example of an opening / closing portion that covers the opening portion formed in the wall portion 24c and allows the opening portion to be opened and closed. The lid portion 25 is made of a conductive material such as a metal material. The lid portion 25 can be formed, for example, by forming a steel material and galvanizing it. The lid portion 25 is attached to the wall portion 24c by a hinge 25a so as to be rotatable around a predetermined axis. A lock 25b is provided to fix the lid 25 to the wall 24c when the lid 25 is closed. When the lid portion 25 is closed, the space 29 is surrounded by the ceiling portion 24a, the floor portion 24b, the wall portion 24c, and the lid portion 25, and the space 29 is electrically sealed.

  A gasket 26 is disposed on the inner surface of the lid portion 25 on the side facing the space 29. The gasket 26 is made of a conductive material and electrically seals between the lid portion 25 and the wall portion 24c. In the gasket 26, a gap is generated between the lid 25 and the wall 24c, and electromagnetic waves are prevented from leaking through the gap. That is, by pressing the gasket 26 against the wall portion 24c with the lid portion 25 closed, the gap between the lid portion 25 and the wall portion 24c is filled with the gasket 26. Thereby, electromagnetic waves can be prevented from passing through the gap between the lid portion 25 and the wall portion 24c. As the gasket 26, for example, shield fingers in which a metal material having a spring property such as beryllium copper is formed into an appropriate shape can be used.

  Cylindrical members 21 and 23 are formed so as to protrude from the wall 24c into the space 29 inside the box 20. The cylindrical members 21 and 23 are erected from a plate member that forms the box body 20, and communicate with the inside and outside of the box body 20 by being formed hollow. The cylindrical members 21 and 23 are illustrated in FIG. 1 so as to protrude from the box 20 toward the external space 39, and in FIG. 2, they protrude from the box 20 toward the internal space 29. It is shown as follows. The cylindrical members 21 and 23 may protrude from the box 20 into any of the inner and outer spaces 29 and 39, or may be formed to protrude into both the spaces 29 and 39.

  The through holes formed in the cylindrical members 21 and 23 are formed so as to extend sufficiently long with respect to the inner diameter, and are formed so as to sufficiently attenuate the electromagnetic waves passing through the inside. For example, if the length of the cylindrical members 21 and 23 (that is, the axial dimension in which the cylindrical shape extends) is 5 times or more the inner diameter of the through-hole, the cylindrical members 21 and 23 pass through the hollow cylindrical members 21 and 23. Electromagnetic waves can be made sufficiently small.

  Returning to FIG. 1, the electric device 1 further includes a wiring 60 (wirings 61 to 63). A filter 71 as a first filter is attached to the housing 30. A filter 72 as a second filter is attached to the box 20. The filters 71 and 72 are electromagnetic wave filters that include a coil, a capacitor, and the like and can block electromagnetic waves having a specific frequency. For example, the filters 71 and 72 can be low-pass filters (high-cut filters) that can block high-frequency electromagnetic waves of 14 kHz or higher. A power source 91 is disposed in the space 9 outside the housing 30.

  The wiring 61 connects the power source 91 and the filter 71. The wiring 62 connects the filter 71 and the filter 72. The wiring 63 connects the filter 72 and the control unit 10. That is, the wiring 60 (wirings 61 to 63) connecting the power source 91 and the control unit 10 is arranged via the filters 71 and 72. Electric power is transported via the wiring 60, and electric power is supplied from the power source 91 to the control unit 10.

  In FIG. 1, the filter 71 is attached to the space 39 side inside the housing 30 and the filter 72 is attached to the space 39 side outside the box body 20. However, the configuration is not limited to this. The filters 71 and 72 can be arranged at arbitrary positions as long as they can sufficiently block electromagnetic waves leaking to the space 39 through the wiring 60. For example, the filter 71 may be attached to the space 9 side of the housing 30 and the filter 72 may be attached to the space 29 side of the box 20.

  According to the electric apparatus 1 described above, the signal line 51 that transmits a control signal from the control unit 10 to the target object 40 that is a controlled device or the signal that is detected by the target object 40 that is a measuring instrument is transmitted to the control unit 10. The signal line 51 to be made is made of an insulating material. Therefore, electromagnetic waves generated by the control unit 10 in the space 29 in the box 20 can be prevented from being transmitted to the space 39 outside the box 20 through the signal line 51.

  Further, the signal line 51 is disposed so as to penetrate the box 20 through the inside of the hollow cylindrical member 21. Therefore, the electromagnetic wave propagated from the space 29 into the through hole of the cylindrical member 21 is rapidly attenuated inside the through hole. The intensity of the electromagnetic wave transmitted through the through hole and propagating from the space 29 to the space 39 is extremely small as compared with the intensity of the electromagnetic wave in the space 29. That is, leakage of electromagnetic waves from the space 29 to the space 39 via the cylindrical member 21 is suppressed. The cylindrical member 21 has a radio wave shielding function that suppresses propagation of electromagnetic waves between the spaces 29 and 39.

  On the other hand, the wiring 60 for supplying power from the power supply 91 to the control unit 10 is made of a conductive material typified by a metal wire such as a copper wire, and therefore electromagnetic waves propagate through the wiring 60. However, even if the electromagnetic wave generated in the space 9 outside the housing 30 propagates through the wiring 61 disposed in the space 9, the electromagnetic wave leaks into the space 39 in the housing 30 because it is blocked by the filter 71. Is suppressed. Further, even if the electromagnetic wave generated in the space 29 in the box 20 propagates through the wiring 63 arranged in the space 29, it is blocked by the filter 72, so that leakage of the electromagnetic wave into the space 39 is suppressed. Yes.

  Accordingly, since leakage of electromagnetic waves from the spaces 9 and 29 to the space 39 can be suppressed, the space 39 is kept in a clean electromagnetic environment with few electromagnetic waves. As a result, it is avoided that electromagnetic waves adversely affect the devices arranged in the space 39 typified by the target object 40, causing malfunctions such as malfunction of the devices and increase in errors. be able to.

  The filters 71 and 72 that block electromagnetic waves generally have large external dimensions and are expensive. Therefore, in order to reduce the size and cost of the electric device 1, it is desirable to minimize the electromagnetic wave filter. In the electric device 1 according to the present embodiment, it is not necessary to use an electromagnetic wave filter for blocking electromagnetic waves via the signal line 51, and the electromagnetic wave filter is used only for the wiring 60. Therefore, in the present embodiment, the electric device 1 can be reduced in size and cost.

  When the signal line 51 is an optical fiber, the length of the signal line 51 capable of transmitting a signal is limited, so that it is difficult to dispose the control unit 10 at a position far from the object 40 (for example, 10 m or more). It is. That is, it is necessary to provide the control unit 10 near the object 40. In this case, the control unit 10 is arranged in the box body 20 that blocks electromagnetic waves as described above, and the electromagnetic wave generated by the control unit 10 can be prevented from leaking outside the box body 20. It is possible to suppress the electromagnetic wave generated by the control unit 10 arranged near the object 40 from affecting the object 40.

  As shown in FIG. 1, the electric device 1 further includes an object 42 as an actuator that receives supply of energy from the control unit 10 and converts the supplied energy into a final mechanical work. In addition, the electric device 1 includes a pipe portion 80. The pipe part 80 connects the control unit 10 and the object 42, and a working fluid such as water, oil or air for operating the object 42 circulates therethrough. The pipe part 80 is formed of an insulating material typified by a resin material. For the material of the tube portion 80, for example, any insulating material such as vinyl chloride, nylon, polyurethane, and fluororesin can be applied. The pipe part 80 can be a flexible resin hose.

  A hollow cylindrical member 22 that communicates the inside and outside of the box body 20 is erected on the box body 20. The pipe portion 80 is disposed so as to penetrate the inside of the cylindrical member 22. The through hole formed in the cylindrical member 22 is formed so as to extend sufficiently long with respect to the inner diameter, and is formed so as to sufficiently attenuate the electromagnetic wave passing through the inside. For example, the cylindrical member 22 is formed so that the length of the cylindrical member 22 (that is, the axial dimension in which the cylindrical shape extends) is five times or more the inner diameter dimension of the through hole.

  In this way, since the pipe portion 80 through which the working fluid for operating the object 42 that is an actuator is made of an insulating material, the electromagnetic waves generated by the control unit 10 in the space 29 in the box 20 are Propagation through the tube 80 to the space 39 outside the box 20 can be avoided.

  Moreover, the pipe part 80 is arrange | positioned so that the box 20 may be penetrated via the inside of the hollow cylinder member 22. FIG. Since the cylindrical member 22 is formed so that the electromagnetic wave passing through the inside of the hollow cylindrical member 22 is sufficiently small, the electromagnetic wave propagated from the space 29 into the through hole of the cylindrical member 22 is suddenly generated inside the through hole. Attenuates. The intensity of the electromagnetic wave transmitted through the through hole and propagating from the space 29 to the space 39 is extremely small as compared with the intensity of the electromagnetic wave in the space 29. That is, leakage of electromagnetic waves from the space 29 to the space 39 via the cylindrical member 22 is suppressed.

  Accordingly, since leakage of electromagnetic waves from the spaces 9 and 29 to the space 39 can be further suppressed, the space 39 is kept in a cleaner electromagnetic environment with less electromagnetic waves. As a result, it is more effective that electromagnetic waves adversely affect the devices arranged in the space 39 typified by the target object 42, causing malfunctions such as malfunctions of the devices and increased errors. Can be avoided.

  As shown in FIG. 1, the electric device 1 further includes a signal line 53 as another signal line that connects the electric device 92 disposed outside the housing 30 and the control unit 10. The control unit 10 and the electric device 92 outside the housing 30 are connected by the signal line 53. For example, the electrical device 92 is a monitor or an alarm device, and outputs the state in which the control unit 10 controls each device to the outside of the housing 30 and monitors the control unit 10 from the outside of the housing 30. Can do. In addition, for example, the electric device 92 disposed outside the housing 30 is a computer, and a command such as a change of a control setting value can be input to the control unit 10 from an input device such as a keyboard.

  The signal line 53 is made of an insulating material. Typically, the signal line 53 is an optical fiber having a fibrous glass or resin material as a medium, and has a signal transmission capability when light is transmitted through the medium by total reflection or refraction. Yes.

  A hollow cylindrical member 23 that communicates the inside and the outside of the box body 20 is erected on the box body 20. The casing 30 is provided with a cylindrical member 33 as another cylindrical member. The cylindrical member 33 is formed in a hollow shape and communicates with the inside and outside of the housing 30. The signal line 53 is disposed through the inside of the cylindrical members 23 and 33. The through holes formed in the cylindrical members 23 and 33 are formed so as to extend sufficiently long with respect to the inner diameter, and are formed so as to sufficiently attenuate electromagnetic waves passing through the inside. For example, the cylindrical members 23 and 33 are formed so that the length of the cylindrical members 23 and 33 (that is, the axial dimension in which the cylindrical shape extends) is five times or more the inner diameter dimension of the through hole.

  In this way, since the signal line 53 is made of an insulating material, electromagnetic waves generated in the space 9 outside the housing 30 are prevented from leaking into the space 39 inside the housing 30 through the signal line 53. it can. And it can avoid that the electromagnetic waves which the control unit 10 generate | occur | produces in the space 29 in the box 20 are propagated to the space 39 outside the box 20 along the signal line 53.

  Further, the signal line 53 is disposed so as to penetrate the box 20 through the inside of the hollow cylinder member 23 and to penetrate through the housing 30 via the inside of the hollow cylinder member 33. The cylindrical members 23 and 33 are formed so that the electromagnetic waves passing through the hollow cylindrical members 23 and 33 are sufficiently small. Therefore, the electromagnetic wave propagated from the space 29 into the through hole of the cylindrical member 23 and the electromagnetic wave propagated from the space 9 into the through hole of the cylindrical member 33 are rapidly attenuated inside the through hole. The intensity of the electromagnetic wave that is transmitted through the through hole and propagates from the space 9, 29 to the space 39 is extremely small compared to the intensity of the electromagnetic wave in the space 9, 29. That is, leakage of electromagnetic waves from the spaces 9 and 29 to the space 39 via the cylindrical members 23 and 33 is suppressed.

  Accordingly, since leakage of electromagnetic waves from the spaces 9 and 29 to the space 39 can be further suppressed, the space 39 is kept in a cleaner electromagnetic environment with less electromagnetic waves. As a result, electromagnetic waves adversely affect the devices arranged in the space 39 typified by the objects 40 and 42, and problems such as malfunctions of the devices and increased errors occur. This can be avoided more effectively.

  FIG. 3 is a block diagram illustrating a connection example between the control unit 10 and the object 41. As shown in FIG. 3, the control unit 10 arranged inside the box 20 includes an optical repeater 11 that converts an electrical signal into an optical signal and relays it, and an I / O unit that inputs and outputs control signals and data. 12 and an air solenoid valve 13 for supplying air to an air cylinder 42 disposed in a space 39 outside the box 20. Further, the control unit 10 receives inputs from the pressure switch 14 for measuring the pressure of the air flowing through the air hoses 81 to 83 connected to the air solenoid valve 13 and the optical fiber sensor 41 disposed in the space 39 outside the box 20. And an optical fiber amplifier 15 for amplifying the optical signal.

  The air cylinder 42 is an example of an actuator, and is driven using the pressure of air supplied from the air solenoid valve 13 via the air hoses 81 and 82. The optical fiber sensor 41 is an example of a sensor that detects a physical quantity to be measured and converts it into a signal that can be easily processed. The optical fiber sensor 41 converts the detected physical quantity into an optical signal. The optical signal is transmitted to the optical fiber amplifier 15 via a signal line 51 connecting the optical fiber sensor 41 and the optical fiber amplifier 15.

  A signal line 53 is connected to the optical repeater 11. The signal line 53 is disposed so as to penetrate the box 20, is further disposed so as to penetrate the housing 30 illustrated in FIG. 1, and is connected to the electric device 92 disposed in the space 9 outside the housing 30. Yes.

  In the configuration shown in FIG. 3, the air hoses 81 to 83 and the signal lines 51 and 53 are all made of an insulating material, and are disposed through the inside of the cylindrical members 21 to 23 erected from the box 20. Yes. The wirings 62 and 63 are made of a conductive material typified by a metal wire such as a copper wire, and electromagnetic waves can propagate through the wirings 62 and 63. However, even if the electromagnetic wave generated in the space 29 in the box 20 propagates through the wiring 63 disposed in the space 29, it is blocked by the filter 72.

  Therefore, electromagnetic waves generated in the space 29 in the box body 20 can be prevented from being transmitted to the space 39 outside the box body 20 through the signal lines 51 and 53, the air hoses 81 to 83, or the wirings 61 and 62. Further, leakage of electromagnetic waves from the space 29 to the space 39 via the cylindrical members 21 to 23 is suppressed. Therefore, leakage of electromagnetic waves from the space 29 to the space 39 can be suppressed.

  The configuration of the control unit 10 is not limited to the configuration shown in FIG. For example, a control unit 10 including any device for controlling equipment to be controlled, such as switches, valves such as a control valve for controlling devices by air or hydraulic pressure, solenoid valves, controllers, sensors, etc. It is possible to provide. The equipment to be controlled may be a hydraulic cylinder in addition to the air cylinder 42 shown in FIG.

  Further, as shown in FIG. 1, a plurality of control units 10 may be arranged in a space 39 inside the housing 30. In this case, the preparation unit and the setup device that are used only when setting the electric device 1 and are not used when the electric device 1 is operated can be used as one control unit 10. Further, the regular device and the abnormality monitoring device used when the electric device 1 is operated can be the other control unit 10. The one control unit 10 and the other control unit 10 can be arranged in separate boxes 20.

  In this way, if the devices included in the control unit 10 are classified by use and arranged in separate boxes 20, power is supplied only to the preparation and setup devices when necessary. Can do. That is, when the electric apparatus 1 is operated, it is not necessary to supply power to the preparation and setup devices. Therefore, no electromagnetic waves are generated from the preparation and setup equipment during operation of the electrical apparatus 1. Therefore, leakage of electromagnetic waves generated by the control unit 10 into the space 39 can be further suppressed.

  Although the embodiment of the present invention has been described as above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Electric device 9, 29, 39 Space, 10 Control unit, 20 Box, 21, 22, 23, 33 Cylindrical member, 30 Case, 40, 41, 42 Target object, 51, 53 Signal line, 60, 61 , 62, 63 wiring, 71, 72 filter, 80 pipe section, 91 power supply, 92 electrical equipment.

Claims (3)

A housing that blocks electromagnetic waves,
A box that is disposed in the housing and blocks electromagnetic waves;
A control unit that is disposed in the box and controls an object disposed in the housing;
The box is provided with a hollow cylindrical member that communicates the inside and outside of the box, and further,
A signal line made of an insulating material for connecting the control unit and the object;
A wiring for connecting the power supply and the control unit arranged outside the housing;
The signal line is disposed through the inside of the cylindrical member,
The said wiring is an electrical apparatus arrange | positioned via the 1st filter attached to the said housing | casing and the 2nd filter attached to the said box. A pipe portion made of an insulating material for connecting a working fluid for connecting the control unit and the object and operating the object;
The electric device according to claim 1, wherein the tube portion is disposed through the inside of the cylindrical member. Other signal lines made of an insulating material for connecting the control unit and the electric equipment arranged outside the housing,
The casing is provided with other hollow cylindrical members communicating with the inside and outside of the casing,
The electric device according to claim 1, wherein the other signal line is disposed so as to penetrate through the inside of the cylindrical member and the other cylindrical member.

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