JP2534612Y2 - Explosion-proof wireless equipment - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an explosion-proof wireless device, and more specifically, for example, in an atmosphere where flammable chemicals or the like exist (hereinafter referred to as a hazardous area). TECHNICAL FIELD The present invention relates to an explosion-proof wireless device capable of using remote control of handled equipment while ensuring safety.

[Conventional technology]

Conventionally, remote operation of various handling equipment in hazardous areas
Usually, signal transmission is performed by a wire transmission system. In other words, the signal transmission cable is employed, and the signal transmission path is insulated from the outside. The electric field energy generated in the transmission cable is insulated from the outside world, and the transmission cable inner conductor and the like are inflammable in a hazardous area. By preventing contact with substances, safety by remote control is ensured.

However, in the case of the wired transmission system, there are problems that a signal transmission path such as a transmission cable obstructs a handling device and that the device itself does not move smoothly. Therefore, in order to avoid using the signal transmission cable in a dangerous place, it is necessary to rely on a manual operation. However, in the case of a manual operation, automation of the operation is required because there may be a problem such as an error in the operation of the device.

Therefore, attention has been paid to remote control using a wireless transmission method as remote control of various handling devices in a dangerous place. In the case of the transmission method, since a transmission cable is unnecessary, problems such as the signal transmission path obstructing a handling device,
There are many advantages that problems such as erroneous operation due to manual operation can be solved.

[Problems to be solved by the invention]

However, in the case of the wireless transmission method, since the wireless device itself and the antenna (antenna) are used, there are the following problems, which are not suitable for practical use. That is, there is a great risk of igniting a flammable substance (chemicals or the like) due to electric field energy generated in the wireless device main body or antenna power.

Since the antenna is configured to be led out to a dangerous place, it is likely that the antenna directly contacts the flammable substance.

In the case of the wireless transmission system, the ultra-high frequency band is used as the frequency band used.Thus, by using a coaxial cable antenna as the antenna, it is possible to reduce the size of the antenna itself and to maintain a certain level of strength in the antenna itself. However, there remains a problem in the strength of the upper half side of the doublet antenna, and it is difficult to stably fix the doublet antenna to the wireless device main body.
Therefore, the antenna easily swings, and the degree of contact with the flammable substance increases.

The present invention has been made in view of the above points, and a purpose thereof is to provide an explosion-proof wireless device that can be remotely operated by a wireless transmission method in a dangerous place.

[Means for solving the problem]

The explosion-proof wireless device according to the present invention as a means for achieving the above object includes a wireless device main body and a signal input / output unit in the wireless device main body housed and shielded in a magnetic box, and the radio device includes: The antenna connected to the main body is derived from the magnetic box, the derived antenna is covered with a rigid insulator such as hard glass, and the remote control of the handling equipment in an explosive atmosphere is performed via the signal input / output unit. Is made possible.

Here, in the above configuration, usually, the wireless device main body and the signal input / output unit are housed in separate magnetic boxes, and both are connected by a shielded wire. Also, if necessary, a net-like guard is provided on the surface of the antenna cover.

[Action]

The explosion-proof wireless device according to the present invention based on the above-described configuration is, for example, when used as an opening / closing instruction device for a chemical supply valve or the like in a flammable chemical plant, a sensor detects that the supplied chemical amount has been supplied to a tank or the like. When detected by
The detection signal is transmitted to a signal input / output unit, and the detection signal is
The outside is transmitted to the wireless device body shielded by the magnetic box. Then, through the wireless device main body, the outside is transmitted via an antenna protected by a rigid insulator such as hard glass, and when the detection signal is received by the remote control room, the reception signal is received by the remote control room. Based on the above, a chemical supply stop signal is transmitted, the antenna of the explosion-proof wireless device of the present invention, the opening / closing instruction device operates via the wireless device main body, so that the supply stop of the chemical can be instructed by remote control. Works.

When the opening / closing instruction device is installed in a non-hazardous area, the sensor side is an explosion-proof type according to the present invention, but the receiving side may be a general type. Of course, the reverse is also true.

Here, the outside of the signal input / output unit and the wireless device main body is housed and shielded by a magnetic box, so that even if there is an explosion inside the signal input / output unit and the wireless device main body, it can withstand. Since the radiation of electric field energy to the outside in the flammable / explosive atmosphere is prevented by the shield, the explosion of the flammable substance can be prevented. In addition, since the antenna is protected around by a rigid insulator such as hard glass, direct contact between the antenna and an explosive or flammable substance is prevented,
The explosion of the flammable substance can be prevented, and the antenna itself is given rigidity so that the antenna can be fixed to a wireless device or the like in a good condition.

As described above, the explosion-proof wireless device of the present invention is such that the wireless device that is the source of electric field energy is stored and shielded in the magnetic box, and the antenna is protected by an insulator such as hard glass. With this feature, it imparts rigidity to the antenna and exerts an explosion-proof action in a hazardous area.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of the present invention.
The figure is a schematic front view of the device, and FIG. 2 is a plan view.

The explosion-proof wireless device of this embodiment is roughly composed of a wireless device main body 1, an antenna unit 2, and a signal input / output unit 3.

The wireless device main unit 1 uses a transmitter / receiver wireless device. The wireless device main unit 1 is integrated with a power supply 4 and the outside thereof is shielded by a magnetic box 5. An antenna (receiving / transmitting antenna) 6 and a signal input / output unit 3 are led out of the magnetic box 5.

The antenna unit 2 is a hollow cover made of a rigid insulator such as hard glass or ceramic, which is fixed upright detachably by sockets 7 and 7 in parallel with the antenna 6 and a magnetic box 5 for protecting the wireless device main unit 1. It is composed of a body 8. The antenna 6 has a configuration in which the periphery is covered by a hollow cover body 8. A mesh guard 9 made of a magnetic material is provided around the hollow cover 8 to guard the hollow cover 8.

The signal input / output unit 3 is arranged via a shield wire 10,
Like the wireless device main unit 1, it is configured to be shielded by a magnetic box 11 so that a signal is transmitted through a signal input / output terminal 12 to, for example, a chemical supply valve (not shown). It is configured. Where the shield wire
10 is about 500 mm long. By the way, each of the magnetic boxes 5 and 11 is grounded. Further, the wireless device main body 1 can be fixed to a machine frame or the like by mounting brackets 13, 13.

In this configuration, the magnetic boxes 5 and 11 are formed as a pressure-resistant explosion-proof type made of a box that can withstand a predetermined pressure. In the case of a safety-enhancing explosion-proof structure, the magnetic boxes 5 and 11 also have a box having a predetermined hermetic seal. In addition, it is needless to say that the explosion-proof structure is applied to other parts requiring explosion-proof by known means. In addition, it is obvious that the periphery of the magnetic boxes 5 and 11 has an insulating structure or the like.

In the explosion-proof wireless device of the present embodiment, the wireless device main body 1 is shielded, and the antenna (antenna) is used.
Since the antenna 6 is protected by a cover body 8 made of hard glass or the like and retains the transmission / reception function and imparts rigidity to the antenna itself, the antenna 6 itself is prevented from coming into contact with an electrically dangerous substance. At the same time, the antenna itself works so as to improve the state of fixation to a wireless device or the like.

It should be noted that the present invention is not limited to the above-described embodiments, but includes those which can be modified and implemented without departing from the scope of the present invention. Incidentally, the antenna may have a configuration molded with an insulator such as hard glass, or a configuration in which insulating glass or the like is sealed between the cover body and the antenna. In addition, it is natural that a cover body having no guard body may be used as the cover body, and a guard body other than a net-like body may be used as the guard body. Also, as a wireless device according to the present invention, it is embodied as a transmitter and a receiver, a transmitter is arranged in the center, a plurality of receivers are arranged around the transmitter, and various handling devices are arranged via the transmitter and the receiver. Of course, it is also possible to adopt a configuration in which the troll is performed.

[Effect of the invention]

As is clear from the above description, the explosion-proof wireless device of the present invention has a signal input / output unit and a wireless device whose outside is housed and shielded by a magnetic box, thereby preventing radiation of electric field energy. The antenna is
Since the surroundings are protected by an insulator such as hard glass, contact with dangerous substances is prevented, and the antenna itself is given rigidity so that it can be fixed well to a wireless device or the like. .

Therefore, according to the present invention, in various dangerous places,
There is an effect that an explosion-proof wireless device that can be remotely operated by a wireless transmission method can be provided.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a schematic front view of the device, and FIG. 2 is a plan view. DESCRIPTION OF SYMBOLS 1 ... Wireless apparatus main body part 2 ... Antenna part 3 ... Signal input / output part 4 ... Power supply 5 ... Magnetic substance box 6 ... Antenna (receiving and transmitting antenna), 7 ... Socket , 8
…… a hollow cover made of a rigid insulator such as hard glass,
9 ... net-like guard body, 10 ... shield wire, 11 ... magnetic box, 12 ... signal input / output terminal, 13 ... mounting bracket

Claims (2)

(57) [Scope of request for utility model registration] 1. A wireless device main body and a signal input / output unit of the wireless device main body are housed and shielded in a magnetic box, and an antenna connected to the wireless device main body is led out of the magnetic box. An explosion-proof wireless device, wherein the derived antenna is covered with a rigid insulator such as hard glass so that the handling device can be remotely operated in an explosive atmosphere via the signal input / output unit. 2. The explosion-proof radio device according to claim 1, wherein the radio device main body and the signal input / output unit are housed in separate magnetic boxes, and both are connected by a shielded wire.