Sampling flow guide structure of exhalation valve

The sampling flow guide structure comprises a sampling pipe front end and a sampling pipe rear end, a front end ventilation cavity channel is formed in the sampling pipe front end, and a rear end ventilation cavity channel is formed in the sampling pipe rear end; one end of the sampling pipe front end is provided with a front end buffer cavity communicated with the front end ventilation cavity channel, and one end of the sampling pipe rear end is provided with a rear end buffer cavity communicated with the rear end ventilation cavity channel; an exhaling high-pressure sampling flow guide assembly is arranged in the front-end buffer cavity, and an exhaling low-pressure sampling flow guide assembly is arranged in the rear-end buffer cavity; the exhalation high-pressure sampling flow guide assembly is communicated with the sampling seat exhalation high-pressure air inlet, and the exhalation low-pressure sampling flow guide assembly is communicated with the sampling seat exhalation low-pressure air inlet. Accordi