Externally-hung gas sampling probe for vehicle-mounted gas detection instrument

Abstract

The invention discloses an externally-hung gas sampling probe for a vehicle-mounted gas detection instrument. The externally-hung gas sampling probe comprises a probe shell, a front-end dust filter, a filter, a rear-end dust filter, a gas path switching structure and a controller, wherein the front-end dust filter, the filter, the rear-end dust filter, the gas path switching structure and the controller are arranged in the probe shell; the gas path switching structure comprises a forward conducting channel and a reverse purifying channel which can be switched; the controller is connected with the gas path switching structure so as to control the conduction of the forward conduction channel or the reverse purification channel; when the forward conducting channel is conducted, a to-be-sampled environmental gas sequentially passes through the front-end dust filter, a buffer space formed in the probe shell, the forward conducting channel and the rear-end dust filter to complete collection; and when the reverse purification channel is conducted, the to-be-sampled environmental gas sequentially penetrates through the rear-end dust filter, the reverse purification channel, the filter, the buffer space and the front-end dust filter to discharge a residual gas in the buffer space. Compared with the prior art, the externally-hung gas sampling probe can collect the clean to-be-sampled environmental gas.

Description

technical field [0001] The invention relates to the technical field of sampling probes, in particular to an external gas sampling probe used for a vehicle-mounted gas detection instrument. Background technique [0002] The gas detected by the gas detection instrument is mostly poisonous and harmful gas. The sampling gas path of the vehicle-mounted gas detection instrument is closed and does not come into contact with the gas in the vehicle. Generally, the gas detection instrument is placed in the vehicle, and the gas sampling probe Installed outside the vehicle to complete gas sampling. [0003] The patent document with the application number 201820288163.8 discloses a sampling probe for a vehicle-mounted gas detector, including a probe filter, a probe heater and an internal gas path. The probe filter is located at the front end of the sampling probe, which is uneven The mesh structure is used to collect the sample to be tested. The probe heater is located inside the probe ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a plug-in gas sampling probe for vehicle-mounted gas detection instruments, so as to solve the problem in the prior art that the residual ambient gas cannot be discharged and the collection is polluted. Ambient gas, causing inaccurate test results

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