According to the disclosure, a pump unit includes a vibration sensor or a noise sensor, and a controller may control a driving operation of a pump driving unit on the basis of vibration data or noise data. Furthermore, in case that pump driving units are provided, control is performed to adjust a fault threshold value in consideration of influence of vibration or noise therebetween, and thus the reliability of detection or diagnosis of a fault of a pump can be improved, and the safety of an operator can be promoted.

A sleeping system is provided, including an air bladder and a diaphragm pump. The diaphragm pump communicates with the air bladder. The diaphragm pump includes a base, a first inlet, a first outlet, a first noise-eliminating foam, a pump body and a cover. The first inlet is formed on the base. The first outlet is formed on the base. The first noise-eliminating foam is disposed in the base. The cover is connected to the base and covers the pump body, wherein air flow passes through the first inlet into the base and travels through the pump body and the first noise-eliminating foam, and leaves the diaphragm pump through the first outlet to be infused into the air bladder.

Inlet silencer for a volumetric compressor, characterized in that the inlet silencer (1) comprises a housing (2) having at least one inlet (3) and at least one outlet (4), wherein at least one partition wall (6) dividing the housing (2) into at least a first chamber (7) and a second chamber (8) is provided in the housing (2), wherein one chamber (7, 8) connects to the inlet (3) and one chamber (7, 8) connects to the outlet (4), wherein at least one opening (9) connecting both chambers (7, 8) is arranged in the partition wall (6).