JP4847654B2 - Gas detection device and gas detection system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas detection device and a gas detection system.
[0002]
[Prior art]
As a certain type of gas detection device, for example, a gas detection device including a fixed side unit fixed to a wall and a detection unit detachably held by the fixed side unit is known.
[0003]
In such a gas detection device, for example, by providing components such as a sensor unit that requires maintenance such as component replacement in the detection unit, the entire gas detection device can be removed from the installation position. Since the intended maintenance can be performed by removing only the detection unit, high maintainability can be obtained.
[0004]
On the other hand, for example, when the concentration of the gas to be detected reaches a certain level or more, an external control circuit unit that transmits a gas detection signal to the external device (hereinafter also referred to as “gas detection signal for external device”), for example, A signal transmission means comprising a relay whose relay contact is switched by degaussing from a normal operating state in which the relay coil is excited is provided, and a gas detection signal for external equipment is transmitted based on the action of the signal transmission means. A gas detection device having a configuration is known. However, in such a gas detection device, when the detection unit is configured to be detachable, the following problems occur.
[0005]
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 also referred to as “detection unit switch”). )) Must be turned off, but this operation causes the relay coil to be demagnetized, and as a result, an external device gas detection signal is erroneously issued.
[0006]
Actually, for example, in a gas detection system in which a plurality of gas detection devices are connected to a common external device, a gas detection signal for an external device resulting from turning off a detection unit switch related to a certain gas detection device There is a malfunction that the external device is activated by.
[0007]
[Problems to be solved by the invention]
The present invention has been made based on the circumstances as described above, and the object thereof is a pluggable type equipped with a detachable unit, and does not generate an error signal to an external device. The object is to provide a gas detection device.
Another object of the present invention is to provide a gas detection system that has excellent maintainability and can perform highly reliable gas detection.
[0008]
[Means for Solving the Problems]
The gas detector of the present invention comprises a fixed side unit that is fixedly installed, and a detector unit that is detachably held by the fixed side unit,
The detection unit has a detection unit switch that turns the detection unit on or off.
The fixed-side unit includes a power introduction unit and a signal transmission unit that is in a normal operation state in an energized state. When the gas detection signal is generated and the energized state of the signal transmission unit is released, An external control circuit unit for transmitting a detection signal,
The detection unit has a gas concentration detection unit that transmits a gas detection signal, and a control unit that manages the operating state of each component of the detection unit.
In a state where the detection unit is mounted on the fixed side unit, the power introduced through the power introduction unit is detected via the branch path branched from the path supplied to the external control circuit unit in the fixed side unit. It is supplied to the control part in.
[0009]
In the gas detection device of the present invention, the signal transmission means in the external control circuit unit is composed of a relay that is brought into a normal operation state when the relay coil is excited, and the gas to the external device when the relay coil is demagnetized. A detection signal may be transmitted.
Further, the signal transmission means in the external control circuit unit is an optical switch that is brought into a normal operation state when the light emitting diode emits light, and a gas detection signal is transmitted to the external device when the light emitting diode is turned off. May be.
[0010]
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.
At least one of the gas detection devices used is the gas detection device according to any one of claims 1 to 3.
[0011]
[Action]
According to the gas detection device of the present invention, even when the detection unit switch is in the OFF state, the drive power supply is maintained by the dedicated power supply path to the fixed side unit. As a result of the signal transmission means maintaining the normal operation state without releasing the energized state of the transmission means, a gas detection signal (external device gas detection signal) for the external device is not erroneously issued.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
1 and 2 are explanatory views showing an example of the configuration of the gas detection device of the present invention. FIG. 1 shows a state in which the detection unit is mounted on the fixed side unit, and FIG. FIG. 4 shows a state where the detection unit is detached from the fixed unit. FIG. 3 is a block diagram for explaining the relationship between the components according to the gas detector of this example.
This gas detection apparatus includes a fixed side unit 10 fixed to a wall of a factory or other building, and a detection unit 20 that is detachably held by the fixed side unit 10.
In this example, the detection unit 20 is mounted on the stationary unit 10 by being engaged by a slide mounting mechanism, and is fixed by a screw.
[0013]
The fixed-side unit 10 is arranged on the inner surface side of the chassis 11 composed of a bottom 11A and a side 11B having, for example, a screw hole and the like, extending continuously in a direction perpendicular to the bottom 11A, and the side 11B of the chassis 11. For example, an external control circuit unit 30 that transmits an external device gas detection signal to an external device such as a ventilation fan, and a power introduction unit 15 that is provided on the bottom 11A of the chassis 11 and that introduces drive power And a gas inlet / outlet part 13 provided at a position adjacent to the electric power introduction part 15.
In this example, the power introduction unit 15 is provided with a power switch related to a gas detection device that is turned on when drive power is introduced.
[0014]
The fixed unit 10 includes a power connection unit 15A for supplying the driving power introduced through the power introduction unit 15 to the detection unit 20, and a dangerous concentration at which the detected gas concentration is a constant level. Gas detection signal connection unit 18 for transmitting a gas detection signal transmitted from detection unit 20 to the fixed unit 10 when the level is exceeded, and external device gas detection transmitted from external control circuit unit 30 And a contact 19 for transmitting a signal to an external device.
[0015]
The external control circuit unit 30 includes a signal transmission means including a relay having a relay coil 32 and a relay contact, and a relay control circuit 35 having a configuration shown in FIG. 4, for example.
The relay which is a signal transmission means maintains a normal operation state when the relay coil 32 is excited.
The relay control circuit 35 includes a transistor switch 37.
[0016]
In the external control circuit unit 30, when no gas detection signal is 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, whereby the relay is activated. Maintain normal operating conditions. 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, since the transistor switch 37 is not turned on, the relay coil 32 is demagnetized, thereby switching the relay contact of the relay in a normal operation state, thereby causing the external control circuit unit 30 to externally switch. An instrument gas detection signal is transmitted.
[0017]
The detection unit 20 has an operation panel, and by transmitting appropriate command signals to the respective components of the detection unit 20 based on input information input through the operation panel, the respective components A control unit 21 that manages the operation state of the gas generator, a pump unit 25 that operates to introduce and discharge the gas to be detected through the gas inlet / outlet unit 13 and the gas flow path connection unit 27 of the fixed side unit 10, and A sensor unit 26 for transmitting a detection unit signal based on the detected gas and a detected gas concentration based on the detection unit signal from the sensor unit 26, and when the detected gas concentration exceeds a certain level The gas concentration detection part 22 which transmits a gas detection signal is provided, and all these components are integrally supported by 20 A of detection part unit main bodies.
[0018]
The detection unit 20 further displays a power connection unit 24 for supplying driving power introduced from the power introduction unit 15 of the fixed side unit 10 to the detection unit 20 and the detected gas concentration. Display unit 28 and a gas detection signal connection unit 22A made of, for example, a terminal plate for transmitting a gas detection signal transmitted from the gas concentration detection unit 22 to the external control circuit unit 30 of the fixed unit 10. is doing.
[0019]
The control unit 21 is provided with a detection unit switch that is a switch for driving the detection unit 20 and is turned on or off by operation.
[0020]
Various sensors such as a semiconductor sensor, a constant potential electrolytic sensor, a diaphragm galvanic cell sensor, and a thermal particleization sensor can be appropriately used for the sensor unit 26 according to the type of gas to be detected.
Therefore, the gas detection device specifically includes, for example, methane gas, hydrogen gas, oxygen gas , carbon monoxide gas, hydrogen sulfide gas, sulfur dioxide gas, nitrogen monoxide gas, nitrogen dioxide gas, phosgene gas, Freon gas, ammonia gas, silane gas. Various gases such as those described above can be used as detection target gases (detected gases).
[0021]
In this gas detection device, each of the sensor unit 26 and the pump unit 25 which are components of the detection unit 20 needs maintenance.
[0022]
By attaching the detection unit 20 to the fixed unit 10, the power connection 15 </ b> A of the fixed unit 10 and the power connection 24 of the detection unit 20 are electrically connected, thereby introducing power. A dedicated branch power supply path 16B for supplying drive power directly from the unit 15 to the control unit 21 is formed.
Accordingly, the drive power introduced through the power introduction unit 15 is supplied to the external control circuit unit 30 through the main power supply path 16A of the power supply path 16, and is branched from the main power supply path 16A. It is supplied to the control unit 21 via the power supply path 16B.
[0023]
Further, the gas flow path is formed by connecting the gas inlet / outlet part 13 of the fixed unit 10 and the gas flow path connecting part 27 of the detection unit 20.
In FIG. 2, 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 each component of the gas detection device is indicated by a dotted line.
[0024]
And the gas detection signal path | route for transmitting the gas detection signal by connecting the gas detection signal connection part 18 of the stationary unit 10 and the gas detection signal connection part 22A of the detection part unit 20 electrically. 23 is formed, thereby achieving a state in which the gas concentration detection unit 22 and the external control circuit unit 30 are electrically connected.
[0025]
According to the gas detection device having such a configuration, the gas detection operation is performed as follows.
In the gas detection device, the detection unit 20 is mounted on the fixed side unit 10 and the power switch is turned on by introducing drive power through the power introduction unit 15. The gas detection operation is performed by setting the unit switch to the ON state. During this gas detection operation, the gas to be detected introduced to the sensor unit 26 through the gas inlet / outlet unit 13 by the action of the pump unit 25. Supplied against.
[0026]
And in the gas concentration detection part 22 which received the detection part signal transmitted from the sensor part 26 based on the supplied to-be-detected gas, a to-be-detected gas density | concentration is calculated based on this detection part signal, and the value is set. It is displayed on the display unit 28.
In addition, the gas concentration detection unit 22 transmits a gas detection signal when the obtained concentration of the gas to be detected exceeds a certain dangerous concentration level.
[0027]
As described above, 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 gas detection signal is generated from the external control circuit unit 30. .
[0028]
According to the gas detector as described above, the driving power introduced through the power introduction unit 15 branches from the main power supply path 16A for supplying the driving power to the external control circuit unit 30 of the fixed side unit 10. The branch power supply path 16B is cut off when the detection unit switch is turned off because the control unit 21 of the detection unit 20 is supplied via the branched power supply path 16B. However, the main power supply path 16A is not cut off, and the driving power is supplied to the external control circuit unit 30 by the main power supply path 16A. As a result of the relay coil 32 in 30 being not demagnetized and maintaining the relay in a normal state, the external device gas detection signal is not erroneously issued.
[0029]
Accordingly, the detection unit 20 can be detached from the stationary unit 10 without any problem without being restricted by the state of the detection unit switch , and the intended maintenance can be performed by removing only the detection unit 20. Therefore, high maintainability can be obtained.
[0030]
Further, since the operation of each component related to the stationary unit 10 can be continued even during the maintenance of the detection unit 20, the time required to start up the gas detection device immediately after the maintenance is completed can be shortened. it can.
[0031]
This gas detection device can be reduced in size, and in practice, for example, the width of the side portion 11B of the chassis 11 in the fixed unit 10 can be set to a size of 70 mm.
[0032]
This gas detection device is used for centralized management, for example, and constitutes a gas detection system in which a plurality of gas detection devices each using a different type of gas are connected to a common external device. It can be suitably used as a gas detection device.
According to the gas detection system including a plurality of such gas detection devices, the detection unit switch related to the detection unit of the gas detection device for detecting a certain kind of gas is turned off. Therefore, even if another gas detection device is in the gas detection operation, the detection unit of the gas detection device alone can be removed and maintenance can be performed. it can. Therefore, excellent maintainability can be obtained, and highly reliable gas detection can be performed.
[0033]
The gas detection device and gas detection system of the present invention can be suitably used, for example, in a semiconductor manufacturing process.
[0034]
Various modifications can be made in the present invention.
For example, in the gas detector, the signal transmission means of the external control circuit unit in the fixed unit is made into a normal operation state when the light emitting diode emits light, for example, an optical switch such as a photocoupler, and the light emitting diode is turned off. The gas detection signal for the external device may be transmitted when it is done.
Also in the gas detection device having such a configuration, it is possible to obtain an operational effect that an error signal is not issued to an external device, similarly to the gas detection device in which the signal transmission means is a relay.
[0035]
In addition, as long as the fixed side unit has a power introduction unit and an external control circuit unit, and the detection unit has a control unit, the components constituting each unit are not limited.
[0036]
【The invention's effect】
According to the gas detection device of the present invention, even when the detection unit switch is in the OFF state, the drive power supply is maintained by the dedicated power supply path to the fixed side unit. As a result of the signal transmission means maintaining the normal operation state without releasing the energized state of the transmission means, a gas detection signal for an external device is not erroneously issued.
[0037]
In addition, according to the gas detection system of the present invention, it is possible to prevent an external device from malfunctioning due to the detection unit switch related to the detection unit of the gas detection device having the above characteristics being turned off. As a result, excellent maintainability can be obtained, and highly reliable gas detection can be performed.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating an example of a configuration of a gas detection device according to the present invention, and is a diagram illustrating a state in which a detection unit is attached to a stationary unit.
FIG. 2 is an explanatory diagram showing a state where a detection unit is detached from a fixed unit in the gas detection device of FIG.
FIG. 3 is a block diagram for explaining the relationship between each component related to the gas detection device of FIG. 1;
4 is an explanatory circuit diagram illustrating a relay control circuit in an external control circuit unit according to the gas detection device of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Fixed side unit 11 Chassis 11A Bottom part 11B Side part 13 Gas inlet / outlet part 15 Power introduction part 15A Power connection part 16 Power supply path 16A Main power supply path 16B Branch power supply path 18 Gas detection signal connection part 19 Contact point 20 Detection part Unit 21 Control unit 22 Gas concentration detection unit 22A Gas detection signal connection unit 23 Gas detection signal path 24 Power connection unit 25 Pump unit 26 Sensor unit 27 Gas flow channel connection unit 28 Display unit 30 External control circuit unit 32 Relay coil 35 Relay control circuit 37 Transistor switch 38 Jumper 38a Contact

Claims (4)

A fixed-side unit that is fixedly installed, and a detection unit that is detachably held by the fixed-side unit,
The detection unit has a detection unit switch that turns the detection unit on or off.
The fixed-side unit includes a power introduction unit and a signal transmission unit that is in a normal operation state in an energized state. When the gas detection signal is generated and the energized state of the signal transmission unit is released, An external control circuit unit for transmitting a detection signal,
The detection unit has a gas concentration detection unit that transmits a gas detection signal, and a control unit that manages the operating state of each component of the detection unit.
In a state where the detection unit is mounted on the fixed side unit, the power introduced through the power introduction unit is detected via the branch path branched from the path supplied to the external control circuit unit in the fixed side unit. A gas detection device that is supplied to a control unit. The signal transmission means in the external control circuit section is composed of a relay that is brought into a normal operation state when the relay coil is excited, and a gas detection signal is transmitted to an external device when the relay coil is demagnetized. The gas detection device according to claim 1. The signal transmission means in the external control circuit section is composed of an optical switch that is brought into a normal operation state when the light emitting diode emits light, and a gas detection signal is transmitted to an external device when the light emitting diode is turned off. The gas detection device according to claim 1. In a gas detection system in which a plurality of gas detection devices are connected to a common external device,
A gas detection system, wherein at least one of the gas detection devices used is the gas detection device according to any one of claims 1 to 3.

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