1. A liquid foam delivery device, comprising:a motor having a rotating shaft;
a linear transmission mechanism disposed at the rotating shaft;
a unidirectional input/output gas mechanism connected to the linear transmission mechanism; and
a unidirectional input/output liquid mechanism connected to the rotating shaft, wherein the unidirectional input/output liquid mechanism comprises an input/output liquid casing and a gear train, the input/output liquid casing has a liquid-receiving space as well as a liquid inlet and a liquid outlet which are in communication with the liquid-receiving space, the gear train is disposed in the liquid-receiving space to rotate when driven by the rotating shaft, so as to deliver a liquid admitted through the liquid inlet to the liquid outlet,
wherein the linear transmission mechanism comprises an eccentric wheel, a bearing and a reciprocating transmission component, the eccentric wheel is eccentrically fitted around the rotating shaft, the bearing is fitted around the eccentric wheel, the reciprocating transmission component is fitted around the bearing, and an outer rim of the reciprocating transmission component is provided with a push element, a protruding direction of the push element is perpendicular to an axial direction of the rotating shaft, the reciprocating transmission component pushes the unidirectional input/output gas mechanism in a reciprocating manner by the rotational motion of the rotating shaft and the eccentric wheel,
the unidirectional input/output gas mechanism comprises a suction cup component and a film unidirectional valve component, the suction cup component has an end portion connected to the reciprocating transmission component and has a sucking surface connected to the film unidirectional valve component, and the film unidirectional valve component includes a gas inlet and a gas outlet, the film unidirectional valve component comprises a first half valve adjacent to the suction cup component, a second half valve away from the suction cup component and a resilient film sheet, the first half valve is in communication with the suction cup component, the second half valve includes the gas inlet and the gas outlet, the first half valve and the second half valve together define a gas-receiving space, the gas-receiving space is in communication with the gas inlet and the gas outlet, and the resilient film sheet is disposed in the gas-receiving space, the second half valve has a second protruding opening portion in communication with the gas inlet and a second dented opening portion in communication with the gas outlet, the first half valve has a first dented opening portion opposite the second protruding opening portion and has a first protruding opening portion opposite the second dented opening portion, and the resilient film sheet has two resilient valves disposed between the first dented opening portion and the second protruding opening portion and between the first protruding opening portion and the second dented opening portion, respectively, the unidirectional input/output gas mechanism admits gas into the gas inlet and discharges gas from the gas outlet in a direction perpendicular to the rotating shaft through the linear reciprocating motion of the linear transmission mechanism.