Negative pressure absorption device and respiratory anesthesia machine

The utility model is applicable to the field of medical equipment, and provides a negative pressure absorption device and a respiratory anaesthesia machine, the negative pressure absorption device comprises a Laval nozzle, a first receiving chamber, a conversion channel with gradually increased inner diameter, a second receiving chamber, a diffusion channel and a first injection port communicated with the first receiving chamber, the second injection opening is communicated with the second receiving chamber; wherein the small inner diameter end of the switching channel is communicated with the first receiving chamber, and the large inner diameter end of the switching channel is communicated with the second receiving chamber. According to the negative pressure absorption device provided by the embodiment of the utility model, the negative pressure absorption device comprises two stages of assemblies, so that the suction amount can be doubled, and the overall performance is improved. 本实用新型适用于医疗设备领域，提供了一种负压吸收装置及