JP2015055489A - Gas detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas detector capable of adjusting the gas flow rate for each of a plurality of sensors.SOLUTION: The gas detector X includes a plurality of sensor units 10-50 having sensors 12-52 for detecting the variation of an external environment. The sensor units 10-50 include pumps 15-55 for sucking atmosphere gas, respectively. Even when inconvenience is caused by excessive suction force depending on the type of the sensor, the gas detector performs gas detection with an appropriate flow rate corresponding to the characteristic of each sensor by adjusting the flow rate of the atmosphere gas by adjusting the suction force by the pump for a desired sensor.

Description

  The present invention relates to a gas detector including a plurality of sensor units each having a sensor that detects a change in the external environment.

  Patent Document 1 discloses a gas detector including a plurality of sensors. This gas detector includes a sensor case in which a plurality of oxide semiconductor sensors are arranged, and the upstream side of the sensor case is connected to a sample suction port to which a sample gas container containing a sample gas is connected. . On the other hand, the downstream side of the sensor case was connected to a suction pump. The plurality of oxide semiconductor sensors were arranged in series so as to sequentially contact the introduced sample gas.

JP 2001-201436 A

  In the gas detector described in Patent Document 1, one suction pump is provided for a plurality of sensors arranged in series. In this case, the suction pump disposed downstream of the sensor case can suck a plurality of sensors and suck the sample gas from the upstream side to the downstream side of the sensor case. However, with this gas detector configuration, the flow rate of the sample gas could not be adjusted for each individual sensor.

  Accordingly, an object of the present invention is to provide a gas detector capable of adjusting a gas flow rate for each sensor among a plurality of sensors.

  In order to achieve the above object, a gas detector according to the present invention is a gas detector including a plurality of sensor units each having a sensor for detecting a change in the external environment, and the first characteristic configuration thereof is the respective sensor unit. In this point, a pump for sucking atmospheric gas is provided.

  In this configuration, both the sensor and the pump can be provided in each sensor unit. Thus, for example, when it is desired to vary the flow rate of the atmospheric gas for each sensor, the flow rate of the atmospheric gas can be easily varied for each sensor by varying the suction force of the pump provided in each sensor unit. it can.

  Therefore, even if an excessive suction force is applied depending on the type of sensor, the gas detector of the present invention adjusts the suction force by the pump to the desired sensor to adjust the flow rate of the atmospheric gas. Since it can be adjusted, gas detection can be performed at an appropriate flow rate according to the characteristics of each sensor.

  The second characteristic configuration of the gas detector according to the present invention is that each sensor unit includes a flow rate adjusting mechanism capable of adjusting the suction amount of the atmospheric gas.

  According to this configuration, the ambient gas can be sampled by adjusting the flow rate to an appropriate flow rate in real time for each sensor unit.

  The third characteristic configuration of the gas detector according to the present invention is that one gas inlet for sucking atmospheric gas from the outside is provided.

  According to this configuration, it is possible to perform gas detection with a plurality of gas sensors by sampling the atmospheric gas at a specific location.

  A fourth characteristic configuration of the gas detector according to the present invention is that each sensor unit includes a sensor block that supports the sensor, and adjacent sensor units are connected by gas flow passages that connect the sensor blocks. It is in.

  With this configuration, each sensor unit can be constructed around the sensor block, and the sensors can be connected in parallel with the sensor block as a base point. Therefore, for example, when it is not desired to operate only a desired sensor unit, in the sensor block of the corresponding sensor unit, if the atmospheric gas is not circulated to the sensor supported by the sensor block, each sensor block Since they are connected by a gas flow path, a sensor unit other than the corresponding sensor unit can be operated.

It is a perspective view which shows the external appearance of the gas detector of this invention. It is a block diagram which shows the outline | summary of a gas detector. It is a perspective view of a sensor unit. It is an exploded view of a sensor buffer. It is a principal part schematic of a gas detector.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present invention is a gas detector including a plurality of sensor units each having a sensor for detecting a change in the external environment. As shown in FIGS. 1-5, the gas detector X in this embodiment demonstrates the case where the five sensor units 10-50 are provided.

  The gas detector X may be any device as long as it is a portable aspect or an aspect that is installed indoors or outdoors on a wall surface. This embodiment demonstrates the case where it is set as the aspect of portability.

  Adjacent sensor units are connected to each other by a pipe 60 through which ambient atmospheric gas flows, and a gas flow passage 70 is formed for flowing ambient atmospheric gas from the upstream sensor unit 10 to the downstream sensor unit 50 in order. The

For example, in the sensor unit 10, the sensor block 11 is formed with a locking hole portion connected to the pipe 60 on the upstream side where the atmospheric gas sucked from the intake port 1 flows in and on the downstream side where the atmospheric gas flows out. . That is, the sensor block 11 is formed with an upstream side locking hole portion 11a into which atmospheric gas flows and a downstream side locking hole portion 11b from which atmospheric gas flows out. In the said upstream side locking hole part 11a and the downstream side locking hole part 11b, each connects with the 1st piping 61 and the 2nd piping 62 (FIG. 5).
The pipe 60 is locked in the locking hole by the O-ring 16.

In the present embodiment, a case where one intake port 1 is formed will be described, but the present invention is not limited to such a mode. For example, an air inlet may be formed for each sensor unit, and the atmosphere gas at different locations may be sampled from each air inlet. When one intake port 1 is formed as in the present embodiment, the atmosphere gas at a specific location can be sampled and gas detection can be performed with a plurality of gas sensors. If the plurality of gas sensors are different from each other, gas detection corresponding to the characteristics of each gas sensor can be performed.
On the other hand, when an air inlet is formed for each sensor unit, it is possible to perform multipoint detection that can sample the atmospheric gas at different locations. About a detection aspect, you may comprise so that it can switch whether detection of a specific place or multipoint detection is performed. In this case, it may be configured to be able to switch between one or a plurality of intake ports for sucking in atmospheric gas.

  The sensor unit 10 is supported by a sensor block 11 and includes a sensor 12 that detects a change in the external environment, a flow sensor 13 that measures the flow rate of the atmospheric gas, and a sensor buffer 14 that buffers the atmospheric gas. Further, the gas detector X of the present invention includes a pump 15 that sucks the atmospheric gas downstream of the sensor 12 in the sensor unit 10. The atmospheric gas that has flowed into the sensor block 11 passes through the branch path 71 branched from the gas flow path 70 and flows into the sensor 12, and flows down through the flow sensor 13 and the sensor buffer 14.

  The other sensor units have the same configuration, that is, the sensor unit 20 includes a sensor block 21, a sensor 22, a flow sensor 23, a sensor buffer 24, and a pump 25. The sensor block 21 includes an upstream side locking hole 21a and a downstream side. A locking hole 21b is formed. The second piping 62 is connected to the upstream locking hole 21a, and the third piping 63 is connected to the downstream locking hole 21b.

  The sensor unit 30 includes a sensor block 31, a sensor 32, a flow sensor 33, a sensor buffer 34, and a pump 35, and an upstream locking hole 31 a and a downstream locking hole 31 b are formed in the sensor block 31. A third pipe 63 is connected to the upstream side locking hole 31a, and a fourth pipe 64 is connected to the downstream side locking hole 31b.

  The sensor unit 40 includes a sensor block 41, a sensor 42, a flow sensor 43, a sensor buffer 44, and a pump 45, and an upstream locking hole 41 a and a downstream locking hole 41 b are formed in the sensor block 41. The fourth pipe 64 is connected to the upstream side locking hole 41a, and the fifth pipe 65 is connected to the downstream side locking hole 41b.

  Further, the sensor unit 50 includes a sensor block 51, a sensor 52, a flow sensor 53, a sensor buffer 54, and a pump 55, and an upstream locking hole 51a and a downstream locking hole 51b are formed in the sensor block 51. The fifth pipe 65 is connected to the upstream side locking hole 51a. Since the sensor unit 50 is the most downstream unit, the downstream locking hole 51b may be configured so that the atmospheric gas does not flow downstream. Therefore, the downstream side locking hole 51b may be sealed, and the downstream side locking hole part may not be provided.

Adjacent sensor units 10 to 50 are connected by gas flow passages 70 connecting the respective sensor blocks 11 to 51.
As described above, each of the sensor blocks 11 to 51 supports the sensors 12 to 52, and the sensor blocks 11 to 51 are connected to adjacent sensor units via the pipe 60. With this configuration, the sensor units 10 to 50 can be constructed around the sensor blocks 11 to 51, and the sensors 12 to 52 can be connected in parallel with the sensor blocks 11 to 51 as a base point. Therefore, for example, when it is not desired to operate only a desired sensor unit, in the sensor block of the corresponding sensor unit, if the atmospheric gas is not circulated to the sensor supported by the sensor block, each sensor block Since 11-51 are connected by the piping 60, sensor units other than a corresponding sensor unit can be operated.

The atmospheric gas that has flowed into the sensor blocks 21 to 51 passes through the branch paths 72 to 75 branched from the gas flow path 70 and flows into the sensors 22 to 52, respectively, and flows through the flow sensors 23 to 53 and the sensor buffers 24 to 54, respectively. Flow down.
It is possible to output a signal including information such as a flow rate from the flow sensors 13 to 53. At this time, monitoring is performed by connecting to an external device that can receive the signal and display information such as a flow rate. Thus, clogging of piping due to dirt or the like, failure of the pump unit, etc. can be detected at an early stage.

  Further, each sensor unit or a desired sensor unit may be provided with a flow rate adjusting mechanism capable of adjusting the suction amount of the atmospheric gas based on such flow rate information (not shown). Thereby, it is possible to perform sampling of the atmospheric gas by adjusting the flow rate in real time for each sensor unit.

  The atmospheric gas discharged from the pumps 15 to 55 is discharged from the exhaust port 2 to the outside of the gas detector X via the exhaust passages 81 to 85 provided for each sensor unit and the out buffer 80.

  Each of the sensor units 10 to 50 includes sensors 12 to 52 that detect changes in the external environment. As such a sensor, a gas sensor such as an oxygen sensor, a CO sensor, a city gas sensor, and an LP gas sensor can be used, but is not limited thereto.

  The gas sensor may be in any form as long as it detects the gas to be detected. For example, an oxygen sensor can detect oxygen gas, a CO sensor can detect carbon monoxide gas generated by incomplete combustion, and a city gas sensor can detect a leak gas such as hydrocarbon gas. A semiconductor sensor element, a contact combustion sensor element, an electrochemical sensor, and the like can be used.

  The gas detector X receives an alarm signal from the calculation means when a later-described calculation means (not shown), for example, determines that the sensor 12 continuously detects the detected gas at the alarm level or higher. It is connected with the sound emission part (not shown) which emits. The sound emitting unit may be incorporated in the gas detector X.

The calculation means includes a concentration calculation unit (not shown) that calculates the detected gas concentration based on the output of the sensor 12 that detects the detected gas. Further, when the sensor 12 continuously detects the detected gas concentration equal to or higher than the alarm level, the calculation means controls to transmit an alarm signal to the sound emitting unit and issue an alarm by the sound emitting unit.
Note that the gas detector X of the present invention may be configured so that a display unit (not shown) for displaying the result of the calculation means is provided in the housing so that the concentration of the gas to be detected can be displayed.

  As in the present invention, in each of the sensor units 10 to 50, by providing the pumps 15 to 55 for sucking atmospheric gas downstream of the sensors 12 to 52, both the sensor and the pump can be provided in each sensor unit. . Thereby, for example, when it is desired to vary the flow rate of the atmospheric gas for each sensor, the suction force of the pump provided in each sensor unit may be varied. Therefore, in the gas detector X according to the present invention, since the flow rate of the atmospheric gas can be adjusted by adjusting the suction force by the pump with respect to a desired sensor, the gas detection is performed at an appropriate flow rate according to the characteristics of each sensor. It can be performed.

[Another embodiment 1]
In the embodiment of the gas detector X described above, a configuration including a pyrolysis furnace may be employed (not shown). For example, unsaturated fluorocarbons that are not to be detected may be detected by the sensors 12 to 52 due to the generation of hydrogen fluoride by thermal decomposition. If a pyrolysis furnace is provided as in this configuration so that the gas generated by decomposition in the pyrolysis furnace can be detected by the sensors 12 to 52, it is determined whether or not a gas component outside the detection target is included. be able to.

  The pyrolysis furnace may be disposed upstream of the sensor blocks 11 to 51, or may be disposed only in a desired sensor block among the sensor blocks 11 to 51.

[Another embodiment 2]
In the above-described embodiment, the pumps 15 to 55 for sucking the atmospheric gas are provided downstream of the sensors 12 to 52, but not limited thereto, the pumps 15 to 55 are provided upstream of the sensors 12 to 52, It is good also as a structure which attracts | sucks and supplies atmospheric gas.

  INDUSTRIAL APPLICABILITY The present invention can be used for a gas detector provided with a plurality of sensor units each having a sensor that detects a change in the external environment.

X Gas detector 1 Intake port 10-50 Sensor unit 11-51 Sensor block 12-52 Sensor 15-55 Pump 70 Gas flow path

Claims (4)

A gas detector comprising a plurality of sensor units having sensors for detecting changes in the external environment,
In each sensor unit, a gas detector provided with a pump for sucking atmospheric gas.   The gas detector according to claim 1, wherein each sensor unit is provided with a flow rate adjusting mechanism capable of adjusting the suction amount of the atmospheric gas.   The gas detector according to claim 1, further comprising one intake port for sucking atmospheric gas from outside. Each sensor unit includes a sensor block that supports the sensor,
The gas sensor as described in any one of Claims 1-3 which the adjacent sensor unit is connected by the gas flow path which connects each sensor block.

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