Pneumatic noise elimination device

Abstract

The invention discloses a pneumatic noise elimination device which comprises a micro air pump. An exhausting opening is formed in the top of the micro air pump, an air extraction opening is formed in one side of the exhausting opening, and a pneumatic noise elimination ring matched with the exhausting opening is arranged at the top end of the exhausting opening. The pneumatic noise elimination ring comprises a three-way connector which is installed on the outer side of the top end of the exhausting opening and matched with the exhausting opening, a silica gel hose matched with the three-way connector is arranged between the two ends of the top of the three-way connector in a sleeved mode, and a plurality of micro gaps are formed in the outer side of the silica gel hose. The device has the beneficial effects that the silica gel hose is provided with a plurality of micro gaps, thus the acoustic resistance of the micro gaps can be improved by using the principle that the acoustic resistance is inversely proportional to the square of the aperture, and the sound absorption effect of the micro gaps can be effectively improved. In addition, gas exhausted by the micro air pump flows oppositely in the pneumatic noise elimination ring through the three-way connector and collides at a convergent point, thus energy loss is generated, and the starting sound production capacity can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a pneumatic noise elimination device. Background technique [0002] End-tidal partial pressure of carbon dioxide is one of the important respiratory indicators, which can reflect not only ventilation function, but also circulation and pulmonary blood flow. According to the different analysis methods of gas samples, end-tidal carbon dioxide partial pressure monitoring can be divided into mainstream type and side flow type. Among them, the side-flow monitoring method of end-tidal carbon dioxide partial pressure needs to use a micro gas sampling pump to sample the exhaled gas of the human body, and pump the sampled gas into the sensor gas chamber for concentration analysis. [0003] However, during the sampling process, the traditional miniature gas sampling pump will generate relatively large aerodynamic noise at the exhaust port of the air pump, which will easily have a...

AI Technical Summary

Problems solved by technology

[0003] However, during the sampling process, the traditional miniature gas sampling pump will generate relatively large aerodynamic noise at the exhaust port of the air pump, which will easily have an adverse effect on the user's mood and even health status. Therefore, in order to effectively eliminate the noise, the present invention A ring-mounted sound-absorbing structure is designed to effectively eliminate the generated aerodynamic noise

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