JP2572406Y2 - Gas sampling equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas sampling apparatus for introducing a sample gas from a sample gas source into a gas analyzer, for example, for quantitatively analyzing the sample gas.

[0002]

2. Description of the Related Art In the above gas sampling apparatus,
In order to perform high-precision gas analysis, calibration of the apparatus using a calibration gas is performed prior to gas analysis. Conventionally, as shown in FIG. A supply pipe 14 for the calibration gas A is connected to the introduction pipe 13 so that the calibration gas A is supplied to the gas analyzer 12 as necessary.

[0003]

However, according to such a supply mode of the calibration gas A, the sample gas S is disturbed at the junction 14a of the calibration gas supply pipe 14 with respect to the sample gas S introduction pipe 13. For example, when analyzing the engine exhaust gas, the exhaust gas before and after the explosion is mixed with the exhaust gas at the time of the engine explosion, and further, the calibration gas A staying at the junction 14a gradually mixes with the sample gas S, and the engine explosion occurs. There was a problem that it was not possible to quantitatively analyze the exhaust gas itself at the time or the exhaust gas before and after the explosion. Further, when the calibration gas A is supplied, the sample gas S is drawn into the calibration gas A, and the sample gas S is mixed into the calibration gas A, so that there is a problem that accurate calibration of the apparatus cannot be performed.

[0004] The present invention has been made in view of such circumstances, and solves the above-mentioned inconvenience when introducing a calibration gas to achieve a high-speed response of gas analysis. It is intended to provide a sampling device.

The gas sampling apparatus according to the present invention, which has achieved the above-mentioned object, has a gas introducing pipe provided around the outer periphery of a gas introducing pipe for introducing a sample gas into a gas analyzer. A calibration gas supply pipe is provided in a state where a double pipe is formed, and the sample gas introduction port of the gas introduction pipe is set to be located inside the calibration gas supply pipe with respect to the calibration gas outlet of the supply pipe. There is.

[0005]

According to the above feature, the calibration gas is supplied to the sample gas introduction port, so that the sample gas is made turbulent or the calibration gas is retained in the sample gas introduction pipe. The factor disappears, and only the sample gas is introduced into the gas analyzer in a laminar flow state. On the other hand, since the inlet for the sample gas is refrained from the outlet for the calibration gas, the calibration gas is shielded around the inlet for the sample gas when the calibration gas is supplied. , Only the calibration gas is supplied.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a principle diagram of a gas sampling device for analyzing, for example, engine exhaust gas.
Denotes an engine as a sample gas source, 2 denotes a cell-type gas analyzer for quantitatively analyzing exhaust gas (sample gas) S discharged from the engine 1, and 3 denotes a gas analyzer for introducing the sample gas S into the gas analyzer 2. The gas inlet tube 4 is a sample suction pump. Reference numeral 5 denotes a supply line for the calibration gas A, and a supply line 6 for the calibration gas A in a state in which the outer periphery of the gas introduction tube 3 and the gas introduction tube 3 constitute a double tube.
While the supply pipes 8 and 9 for the zero gas and the span gas with the solenoid valve 7 are merged.
10 is connected to the calibration gas inlet port a of the supply pipe 6, and the calibration gas outlet port b of the supply pipe 6 is made to protrude from the exhaust gas inlet port c of the gas introduction pipe 3 so that the calibration gas A is The gas is introduced into the gas analyzer 2 from the inlet c which is located inward of the outlet b.

According to the above configuration, the calibration gas A is supplied to the gas analyzer 2 through the exhaust gas introduction port c, and the factors that cause the sample gas S to be turbulent or the calibration gas A to stay there are caused by the introduction of the exhaust gas. By removing the sample gas S from the pipe 3, only the sample gas S is introduced into the gas analyzer 2 in a laminar flow state. Good quantitative analysis can be performed.

On the other hand, since the introduction port c of the sample gas S is set inward with respect to the outlet b of the calibration gas A, the introduction port c of the sample gas S is supplied by the calibration gas A when the calibration gas A is supplied. The shield is shielded, and accurate calibration is completed by supplying only the calibration gas A to the gas analyzer. Incidentally, a gas introduction tube 3 having an inner diameter of 2 mm and an outer diameter of 3 mm is used, and 5 liters of gas is sucked into the analyzer 2 per minute. 4mm and outer diameter 6
mm, the inlet b of the exhaust gas is laid down about 10 mm inward with respect to the outlet a of the calibration gas, and
When 7 liters of calibration gas was flowed per minute, supply of only calibration gas without mixing of exhaust gas was achieved.

[0009]

As described above, the gas sampling apparatus of the present invention supplies the calibration gas to the gas inlet of the sample gas introduction pipe, and the turbulence and calibration of the sample gas are introduced into the sample gas introduction pipe. The elimination of the junction for the calibration gas, which is a cause of gas stagnation, makes it possible to introduce only the sample gas into the gas analyzer in a laminar flow state. Exhaust gas can be quantitatively analyzed with good responsiveness. Also, the sample gas inlet is kept inward of the calibration gas outlet, and the sample gas inlet is shielded around the sample gas inlet when the calibration gas is supplied. Only calibration gas is supplied to the gas analyzer,
The instrument was calibrated correctly.

[Brief description of the drawings]

FIG. 1 is a principle view of a gas sampling device according to the present invention.

FIG. 2 is a principle diagram of a conventional gas sampling device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sample gas source, 2 ... Gas analyzer, 3 ... Sample gas inlet pipe, 6 ... Calibration gas supply pipe, b ... Calibration gas outlet, c ... Sample gas inlet.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 1/22 G01N 1/00 101

Claims (1)

(57) [Scope of request for utility model registration] A gas supply pipe for introducing a sample gas from a sample gas source into a gas analyzer is provided with a supply pipe for a calibration gas in a state where the gas introduction pipe forms a double pipe with the gas introduction pipe. A gas sampling apparatus, wherein a sample gas inlet of the gas inlet tube is provided inside the calibration gas supply tube with respect to a calibration gas outlet of the supply tube.