JP2003085673A - Gas detector and gas detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas detector of an insertion type having an attachable and detachable unit not generating erroneous signals to external equipment, and a gas detection system with excellent maintainability capable of highly reliable gas detection. SOLUTION: The gas detector is provided with a fixed side unit and a detection part unit freely attachably and detachably held by the fixed side unit. The fixed side unit is provided with a power introduction part and an external control circuit part for dispatching gas detection signals to the external equipment and the detection part unit is provided with a gas concentration detection part and a control part. In a state of mounting the detection part unit on the fixed side unit, introduced power is supplied to the control part through a branched route branched from a route of supply to the external control circuit part. In the gas detection system, a plurality of the gas detectors are connected to a common external equipment and at least one of the used gas detectors is the above-mentioned gas detector.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gas detection device and a gas detection system.

[0002]

2. Description of the Related Art As a certain type of gas detection device, there is known a gas detection device including a fixed side unit fixed to a wall or the like and a detection unit unit detachably held by the fixed side unit. ing.

In such a gas detection device, by providing the detection unit with components such as a sensor unit requiring maintenance such as parts replacement, the entire gas detection device can be installed from the installation position. Since the intended maintenance can be performed by removing only the detection unit without removing it, high maintainability can be obtained.

On the other hand, for example, when the concentration of the gas to be detected exceeds a certain level, an external control circuit section for transmitting a gas detection signal to an external device (hereinafter, also referred to as "gas detection signal for external device"). However, for example, the relay coil is provided with a signal transmission means consisting of a relay whose relay contact is switched by being demagnetized from a normal operating state in which the relay coil is excited. Based on the action of this signal transmission means, a gas detection signal for external equipment is provided. There is known a gas detector having a configuration for transmitting the following. However, in such a gas detector, if the detector unit is configured to be detachable, the following problems occur.

That is, when performing maintenance of the components provided in the detection unit, when the detection unit is detached from the fixed unit, the power switch of the detection unit (hereinafter referred to as "detection unit switch"). Is also turned off. However, as a result of the demagnetization of the relay coil by this operation, a gas detection signal for external equipment is erroneously issued.

Actually, for example, in a gas detection system in which a plurality of gas detection devices are connected to a common external device, a detection unit switch associated with a certain gas detection device is turned on.
There is a malfunction that the external device is activated by the gas detection signal for the external device due to the FF state.

[0007]

SUMMARY OF THE INVENTION The present invention has been made under the circumstances described above, and an object thereof is to be a pluggable type having a detachable unit and to be connected to an external device. Another object is to provide a gas detection device that does not generate an erroneous signal. Another object of the present invention is to provide a gas detection system having excellent maintainability and capable of highly reliable gas detection.

[0008]

A gas detector of the present invention comprises a fixed unit fixedly installed and a detector unit detachably held by the fixed unit. The side unit includes a power introduction unit and a signal transmission unit that is in a normal operation state when energized,
An external control circuit unit for transmitting a gas detection signal to an external device when the energized state of the signal transmission means is released by the gas detection signal being emitted, and the detection unit unit transmits the gas detection signal. It has a gas concentration detection unit and a control unit that manages the operating state of each component of the detection unit unit, and in the state where the detection unit unit is mounted on the fixed-side unit, through the power introduction unit. It is characterized in that the introduced electric power is supplied to the control section in the detection section unit via a branch path branched from a path supplied to the external control circuit section in the fixed unit.

In the gas detector of the present invention, the signal transmission means in the external control circuit section is a relay that is brought into a normal operating state by exciting the relay coil, and when the relay coil is demagnetized, the external A gas detection signal to the device may be transmitted. Also, the signal transmission means in the external control circuit unit is an optical switch that is brought into a normal operating state by the light emitting diode emitting light, and when the light emitting diode is turned off, a gas detection signal is transmitted to an external device. May be.

The gas detection system of the present invention is a gas detection system in which a plurality of gas detection devices are connected to a common external device, and at least one of the gas detection devices used is any one of claims 1 to 3. It is the gas detection device described in 1.

[0011]

According to the gas detector of the present invention, even when the detector unit switch is in the OFF state, the drive power is maintained to be supplied to the fixed unit by the dedicated power supply path. As a result of maintaining the normal operation state of the signal transmission means in the section without releasing the energized state of the signal transmission means, the gas detection signal to the external device (external device gas detection signal) is not erroneously issued.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. 1 and 2 are explanatory views showing an example of the configuration of the gas detection device of the present invention, and FIG. 1 shows a state in which the detection unit is mounted on the fixed side unit, and FIG. , Shows that the detection unit is separated from the fixed unit. FIG. 3 is a block diagram for explaining the relationship between the components of the gas detector of this example. This gas detection device includes a fixed unit 10 fixed to a wall of a factory or other buildings,
The stationary unit 10 includes a detection unit 20 that is detachably held. In this example, the detection unit 20 has a configuration in which the detection unit 20 is engaged and mounted on the fixed unit 10 by a slide mounting mechanism, and is fixed by a screw.

The fixed-side unit 10 includes a bottom portion 11A and a chassis portion 11B which is continuous so as to extend in a direction perpendicular to the bottom portion 11A and has, for example, a screw hole, and an inner surface of the side portion 11B of the chassis portion 11. An external control circuit unit 30 that is disposed on the side and transmits a gas detection signal for an external device to an external device such as a ventilation fan,
A power introducing unit 15 for introducing drive power, which is provided on the bottom portion 11A of the chassis 11, and the power introducing unit 1
5 and a gas inlet / outlet portion 13 provided at a position adjacent to the gas supply port 5. In this example, the power introduction unit 15 is provided with a power switch related to the gas detection device that is turned on when drive power is introduced.

The fixed unit 10 has a power connecting portion 15A for supplying the drive power introduced through the power introducing portion 15 to the detecting portion unit 20 and a detected gas concentration at a constant level. A gas detection signal connection 18 for transmitting a gas detection signal transmitted from the detection unit 20 to the fixed unit 10 when a certain dangerous concentration level is exceeded, and an external device transmitted from the external control circuit unit 30. And a contact 19 for transmitting the gas detection signal to an external device.

The external control circuit section 30 includes a relay coil 32.
And a signal transmission means including a relay having a relay contact, and a relay control circuit 35 having the configuration shown in FIG. 4, for example. The relay, which is a signal transmitting means, maintains a normal operating state by exciting the relay coil 32. The relay control circuit 35 includes a transistor switch 37.

In the external control circuit section 30, when the gas detection signal is not transmitted, the transistor switch 37 of the relay control circuit 35 is turned on, the jumper 38 is energized to the contact 38a, and the relay coil 32 is excited. , The relay keeps normal operation. In this state, the external device gas detection signal is not transmitted from the external control circuit unit 30. On the other hand, when the gas detection signal is transmitted, the transistor switch 37 is not conducted, so that the relay coil 32 is demagnetized, whereby the relay contact of the relay in the normal operating state is switched, so that the external control circuit unit 30 is externally connected. A gas detection signal for equipment is transmitted.

The detection section unit 20 has an operation panel, and by transmitting an appropriate command signal to each component of the detection section unit 20 based on the input information input via the operation panel, A control unit 21 that manages the operating state of each component, and a pump unit 25 that acts to introduce and discharge the gas to be detected via the gas input / output unit 13 and the gas flow path connection unit 27 of the fixed unit 10.
And a sensor unit 26 that transmits a detection unit signal based on the introduced detection gas, and a detection gas concentration is calculated based on the detection unit signal from the sensor unit 26, and the detection gas concentration is at a constant level. And a gas concentration detection unit 22 that emits a gas detection signal when all of the above conditions are exceeded, and all of these components are integrally supported by the detection unit main body 20A.

The detection unit 20 further includes a power connection 24 for supplying the drive power introduced from the power introduction unit 15 of the fixed unit 10 to the detection unit 20 and a detected gas concentration. Display unit 28 for displaying
And a gas detection signal connection 22 made of, for example, a terminal plate for transmitting the gas detection signal transmitted from the gas concentration detection unit 22 to the external control circuit unit 30 of the fixed unit 10.
Have A and.

The control unit 21 is provided with a detection unit unit switch which is a switch for driving the detection unit unit 20 and which is turned on or off by being operated.

The sensor section 26 includes, for example, a semiconductor type sensor, a potentiostatic electrolytic type sensor, a diaphragm galvanic cell type sensor,
Various sensors such as a thermal particle generation type sensor can be appropriately used according to the type of gas to be detected. Therefore, the gas detection device is specifically, for example, methane gas, hydrogen gas,
Various gases such as oxygen gas, carbon monoxide gas, hydrogen sulfide gas, sulfur dioxide gas, nitric oxide gas, nitrogen dioxide gas, phosgene gas, Freon gas, ammonia gas, and silane gas are used as detection target gases (detection target gases). be able to.

In this gas detecting device, each of the sensor section 26 and the pump section 25, which are the constituent elements of the detecting section unit 20, requires maintenance.

The detection unit 20 is the fixed unit 10.
By being attached to the power unit 15A of the fixed unit 10 and the power unit 2 of the detection unit 20
4 are electrically connected to each other, whereby the power introduction unit 15
From the above, a dedicated branch power supply path 16B for directly supplying the drive power to the control unit 21 is formed. Therefore, the drive power introduced through the power introduction unit 15 is transmitted through the main power supply path 16A of the power supply path 16 to the external control circuit unit 30.
And is supplied to the control unit 21 via a branch power supply path 16B branched from the main power supply path 16A.

Further, the gas flow path is formed by connecting the gas input / output section 13 of the fixed side unit 10 and the gas flow path connecting section 27 of the detection section unit 20. Figure 2
In Fig. 3, the flow of the gas to be detected in the detection unit 20 is indicated by an arrow, and in Fig. 3, the flow of the gas to be detected between the components of the gas detection apparatus is indicated by a dotted line.

Then, the gas detection signal connection portion 18 of the fixed unit 10 and the gas detection signal connection portion 22A of the detection unit unit 20 are electrically connected to each other to transmit the gas detection signal. The detection signal path 23 is formed, whereby the state where the gas concentration detection unit 22 and the external control circuit unit 30 are electrically connected is achieved.

According to the gas detecting device having such a structure, the gas detecting operation is performed as follows. The gas detection device includes a fixed unit 10 and a detection unit 20.
Is mounted, the drive power is introduced through the power introduction unit 15 to turn on the power switch, and by turning on the detection unit unit switch related to the detection unit unit 20, the gas detection operation is performed. Done,
During the gas detection operation, the gas to be detected introduced through the gas inlet / outlet portion 13 is supplied to the sensor portion 26 by the action of the pump portion 25.

Then, in the gas concentration detection unit 22 which receives the detection unit signal transmitted from the sensor unit 26 based on the supplied detection target gas, the detection target gas concentration is calculated based on this detection unit signal, The value is displayed on the display unit 28. Further, in the gas concentration detection unit 22, when the obtained gas concentration to be detected exceeds a dangerous level which is a constant level, a gas detection signal is transmitted.

In this way, when the gas detection signal is transmitted from the gas concentration detection unit 22, the relay coil in the external control circuit unit 30 is demagnetized, whereby the external device detection gas signal for external device is generated. Is emitted.

According to the gas detecting apparatus as described above, the driving power introduced through the power introducing unit 15 supplies the driving power to the external control circuit unit 30 of the fixed unit 10, the main power supply path. Branch power supply path 1 branched from 16A
Since the control unit 21 of the detection unit unit 20 is supplied via 6B, when the detection unit unit switch is turned off, the branch power supply path 16B is cut off. However, since the main power supply path 16A is not interrupted and the drive power is supplied to the external control circuit section 30 by the main power supply path 16A, the relay coil 3 in the external control circuit section 30 is not supplied.
As a result of not demagnetizing No. 2 and maintaining the relay in the normal state, the gas detection signal for external equipment is not erroneously issued.

Therefore, regardless of the state of the power switch, the fixed unit 10 to the detection unit 20
Since it can be removed without any adverse effect, the desired maintenance can be performed by removing only the detection unit 20 and high maintainability can be obtained.

Further, even during the maintenance of the detection unit 20, the operation of each component of the fixed unit 10 can be continued, so that the time required for starting the gas detection apparatus immediately after the maintenance is shortened. can do.

This gas detector can be miniaturized, and in fact, for example, the width of the side portion 11B of the chassis 11 in the fixed unit 10 can be 70 mm.

This gas detection device is used, for example, for centralized control, and is a gas detection system in which a plurality of gas detection devices, each of which has a different type of gas as a gas to be detected, are connected to a common external device. Can be suitably used as a gas detection device constituting the. According to the gas detection system including a plurality of such gas detection devices, it is caused by turning off the detection unit unit switch related to the detection unit unit of the gas detection device for detecting a certain gas. Since it is possible to prevent the gas detection signal for external equipment from being emitted, even if another gas detection device is in the gas detection operation, it is possible to remove the detection unit unit only for the gas detection device and perform maintenance. it can.
Therefore, excellent maintainability can be obtained and highly reliable gas detection can be performed.

The gas detecting device and the gas detecting system of the present invention can be suitably used, for example, in a semiconductor manufacturing process.

Various modifications can be made in the present invention. For example, in the gas detection device, the signal transmission means of the external control circuit unit in the fixed unit is in a normal operating state by the light emitting diode emitting light, for example, an optical switch such as a photo coupler,
The gas detection signal for the external device may be transmitted when the light emitting diode is turned off. Also in the gas detection device having such a configuration, as in the gas detection device in which the signal transmission means is a relay, it is possible to obtain the operational effect of not generating an erroneous signal to an external device.

If the fixed unit has the power introduction section and the external control circuit section, and the detection section unit has the control section, the constituent elements constituting each unit are limited. is not.

[0036]

According to the gas detector of the present invention, even if the detector unit switch is in the OFF state, the drive power is maintained to be supplied to the fixed unit by the dedicated power supply path, and therefore the external unit is not required to operate. As a result of maintaining the normal operation state of the signal transmitting means without releasing the energized state of the signal transmitting means in the control circuit section, the gas detection signal to the external device is not erroneously issued.

Further, according to the gas detection system of the present invention, it is possible to prevent an external device from malfunctioning due to turning off the detection unit unit switch of the detection unit unit of the gas detection device having the above characteristics. Since this can be prevented, excellent maintainability can be obtained and highly reliable gas detection can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a configuration of a gas detection device of the present invention, and is an explanatory view showing a state in which a detection unit is mounted on a fixed side unit.

FIG. 2 is an explanatory diagram showing a state in which a detector unit is separated from a fixed unit in the gas detector of FIG.

FIG. 3 is a block diagram for explaining a relationship between respective constituent elements of the gas detection device of FIG.

4 is an explanatory circuit diagram showing a relay control circuit in an external control circuit unit according to the gas detection device of FIG.

[Explanation of symbols]

10 Fixed unit 11 chassis 11A bottom 11B side 13 Gas input / output section 15 Power introduction section 15A power connection 16 Power supply route 16A Main power supply line 16B branch power supply path 18 Gas detection signal connection 19 contacts 20 Detection unit 21 Control unit 22 Gas concentration detector 22A Gas detection signal connection 23 Gas detection signal path 24 Power connection 25 Pump section 26 Sensor section 27 Gas flow path connection 28 Display 30 External control circuit 32 relay coils 35 Relay control circuit 37 Transistor switch 38 jumpers 38a contact

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2F073 AA40 AB07 AB12 BB04 BC01                       CC08 EE11 EF01 FF17 GG01                 2G060 AA02 AE19 HC10 HD07                 5C086 AA02 DA01 DA08 DA10 FA16                 5C087 AA02 AA03 AA11 BB03 BB74                       DD07 DD33 EE08 EE20 FF01                       FF04 GG56 GG66 GG70 GG83

Claims (4)

[Claims] 1. A stationary unit fixedly installed,
The fixed unit includes a detection unit that is detachably held by the fixed unit, and the fixed unit includes a power introduction unit and a signal transmission unit that is in a normal operating state in an energized state, and emits a gas detection signal. And an external control circuit unit for transmitting a gas detection signal to an external device when the energized state of the signal transmission means is released by the gas concentration detection unit for transmitting a gas detection signal. And a control unit that manages the operation state of each component of the detection unit unit, and when the detection unit unit is attached to the fixed unit, the power introduced through the power introduction unit is , Is supplied to the control unit in the detection unit via a branch path branched from a path supplied to the external control circuit unit in the fixed unit. It is detected apparatus. 2. The signal transmission means in the external control circuit section is a relay that is brought into a normal operating state by exciting the relay coil, and when the relay coil is demagnetized, a gas detection signal is transmitted to an external device. The gas detection device according to claim 1, wherein the gas detection device is provided. 3. The signal transmission means in the external control circuit section is an optical switch which is brought into a normal operation state by the light emitting diode emitting light, and when the light emitting diode is turned off, a gas detection signal is transmitted to an external device. The gas detection device according to claim 1, wherein: 4. In a gas detection system in which a plurality of gas detection devices are connected to a common external device, at least one of the gas detection devices used is any one of claims 1 to 3.
A gas detection system comprising the gas detection device according to claim 3.