JPH0514196Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sampling device suitable for a gas detection device incorporating a plurality of sensors.

(Prior art) For the purpose of inspecting the atmosphere inside a manhole or the like before starting work on the hole, sensor A detects multiple types of gases, such as hydrogen sulfide, oxygen, and carbon monoxide, as shown in Figure 3. ,B,C to main case D
A gas detection device installed at the

This gas detection device usually takes atmospheric gas into the sensor by natural inflow, but in some cases it is necessary to suck the gas with a pump and forcefully supply it to the sensors A, B, and C.

(Purpose) The present invention has been made in view of the above circumstances, and its purpose is to provide a gas sampling device suitable for a portable gas detection device.

(Summary of the invention) That is, the present invention is characterized by having a cap on one surface that fits each of a plurality of gas sensors arranged at one end of the gas detector main body, and at least one of the caps. One cap is airtightly fitted to the outer periphery of the sensor and forms a space between it and the front surface of the sensor, and is further provided with a through hole that communicates directly with the outside air and a through hole that connects to the suction port of the pump. The second feature is that gas can leak even when the sensor is fitted, and that a discharge port is provided that communicates with the discharge port of the pump.

(Example) Therefore, the details of the present invention will be explained below based on the illustrated example.

FIG. 1 shows an embodiment of the present invention, and the reference numeral 1 in the figure is a case that can be attached to and detached from the sensor section of the main body case D of the gas detection device. A member 3, a pump 4, and an electric wire 5 are housed therein, and a gas intake port 6 is made to protrude to the outside.

FIG. 2 shows an embodiment of the above-mentioned gas distributor and connecting member, in which reference numeral 2 denotes a gas distributor, and at a position facing one sensor B of the gas detection device, Two through holes 21 perpendicular to the sensor surface,
22 is bored (see A in the figure), one of the through holes 21 is connected to the gas intake port 6, one end of the other through hole 22 is connected to the suction port 41 of the pump 4, and another sensor A is connected to the suction port 41 of the pump 4. , C are provided with exhaust ports 24 and 25 that communicate with the gas passage 23 connected to the discharge port 42 of the pump 4 (FIG. 3).
A connecting member that connects each sensor of the gas detection device and the gas distributor 2. Caps 31, 32, and 33 are formed on one surface to fit with the outer circumference of the gas sensor, and the caps communicate with the gas intake port 6. cap 32
An O-ring 34 is provided on the inner surface of the sensor B to maintain airtightness with the sensor, and the depth is such that a constant gap is maintained between the sensor B and the front surface of the sensor B to form a chamber. And on the surface facing the pump suction port 41, these through holes 21,
Through-holes 35 and 36 corresponding to 22 are bored. On the other hand, the remaining caps 31 and 33 are provided with through holes 37 and 38 that fit into the tip of the distributor 2.
It is configured to communicate with gas exhaust ports 24 and 25 of the distributor 2. Note that the reference numeral 51 in the figure indicates a gasket for maintaining airtightness between the distributor 2 and the connecting member 3.

In this embodiment, when the connecting member 3 is fitted to the gas sensors A, B, and C of the gas detection device D,
The cap 32 is hermetically fitted to the outer peripheral surface of the sensor B via the O-ring 34, and the other caps 31, 3
3 and the relative positions of sensors A and B are determined. In this state, connect the distal end of the distributor 2 to the through hole 37 of the connecting member 3,
38, fit the case 1 into the measuring device D.

When the pump 4 is activated after completing such preparations, the pump 4 connects the sensor B and the cap 32.
External air is sucked in from the gas intake port 6 through the space partitioned by. Gas flowing in from the gas intake port 6 fills the space formed by the cap 32 and the sensor B, and flows into the suction port 41 of the pump 4 via the other through hole 36. This inflowing gas acts on sensor B located within the cap 32, and the concentration of the specific component is detected.

By the way, since this cap 32 is connected to the suction side of the pump 4, it flows into the sensor B through the shortest possible flow path, so that highly adsorbable substances such as hydrogen sulfide and hydrogen chloride, for example, Even if it is a gas, it will act on the sensor without causing a concentration change based on the flow path length.

The gas that has passed through the cap 32 is sent from the discharge port 42 of the pump 4 via the communication port 23 to the discharge port 24,
25 and discharged into caps 31 and 33, specific components are detected by sensors A and C located here, and then discharged to the outside through gaps between caps 33 and 34 and sensors A and C, etc. Also,
On the discharge side of the pump 4, the gas is distributed to a smaller number of gas outlets 24, 25 than the sensors of the gas detection device, so that the gas is evenly distributed to each sensor.

In this embodiment, the connecting member 3 and the distributor 2 are separated, but it is clear that the same effect can be achieved even if they are integrated.

Further, in this embodiment, one gas sensor is disposed on the pump suction side, but it is clear that the same effect can be achieved even if a plurality of gas sensors are disposed.

(Effects) As described above, the present invention has a cap on one surface that fits each of the plurality of gas sensors disposed at one end of the gas detector main body, and at least one of the caps The cap is airtightly fitted to the outer periphery of the sensor and forms a space between it and the front surface of the sensor, and is also provided with a through hole that communicates directly with the outside air and a through hole that connects to the suction port of the pump. Gas can leak even when the pumps are mated together, and a discharge port is provided that communicates with the discharge port of the pump, reducing the number of sensors connected to the pump discharge side to equalize gas distribution. At the same time, the suction side can act on the sensor without being adsorbed by the flow path components.
Furthermore, the reference position with the detection device is determined by the cap that fits on the pump suction side, so that the sensor and the cap can be reliably fitted without using a special positioning member.

[Brief explanation of the drawing]

Figures 1A and 2B are a perspective view and a top view of a device showing an embodiment of the present invention, Figures 2A and 2B are a cross-sectional view showing the main parts of the same device, and Figure 3 is a multi-gas It is a perspective view showing one example of a detection device. 1... Case, 2... Connection member, 3... Gas distributor, 4... Pump, 5... Power source, 6... Gas intake port, 24, 25... Gas outlet, 31, 3
2, 33... Cap, 34... O-ring, 3
5, 36...Through hole, 41...Suction port, 42...Discharge port.

Claims (1)

[Scope of utility model registration request] It has a cap on one side that fits each of a plurality of gas sensors arranged at one end of the gas detector main body, and at least one of the caps fits airtightly with the outer periphery of the sensor and is connected to the front surface of the sensor. A space is formed between the two caps, and a through hole that directly communicates with the outside air and a through hole that connects to the suction port of the pump are provided, and the other caps are designed to allow gas to leak even when the sensor is fitted. and a discharge port communicating with the discharge port of the pump.