A mobile device case is described. The mobile device case includes a housing configured to retain a mobile device and an active cooling system integrated into the housing. The active cooling system configured to use vibrational motion to cool a surface of the mobile device.

A circulator is described that is configured to circulate liquids such as water, chemical mixtures, suspensions and the like. The circulator has an oscillation shaft disposed within, for example concentrically disposed within, a support tube that is used to mount the circulator to a support structure. Locating the oscillation shaft within the support tube makes the circulator more compact, achieves better alignment of the oscillation shaft and the support tube, and makes the circulator stronger compared to a circulator where the oscillation shaft is not disposed within a support tube. In one embodiment, the circulator can be used to create a continuous flow of water in a body of water including around marinas, areas around docks, and waterfronts.

A circulator is described that is configured to circulate liquids such as water, chemical mixtures, suspensions and the like. The circulator has an oscillation shaft disposed within, for example concentrically disposed within, a support tube that is used to mount the circulator to a support structure. Locating the oscillation shaft within the support tube makes the circulator more compact, achieves better alignment of the oscillation shaft and the support tube, and makes the circulator stronger compared to a circulator where the oscillation shaft is not disposed within a support tube. In one embodiment, the circulator can be used to create a continuous flow of water in a body of water including around marinas, areas around docks, and waterfronts.

A method of producing a flow of a fluid through a passage (24) defined in a rigid frame (22) comprises selectively actuating a flexible membrane (38) disposed across a midpoint of the passage (24) with an actuating system in a manner which produces a wave-like motion in the membrane (38) thereby causing a peristaltic movement of the fluid through the passage (24).

A method of producing a flow of a fluid through a passage (24) defined in a rigid frame (22) comprises selectively actuating a flexible membrane (38) disposed across a midpoint of the passage (24) with an actuating system in a manner which produces a wave-like motion in the membrane (38) thereby causing a peristaltic movement of the fluid through the passage (24).

A rotary fan system with dual rotation axes, wherein a driving arm rotates about a first axis, and trailing arm rotates about a second axis.

An air flow generating device includes an enclosing wall, a frame sheet, a cover film, and a vibrating part. The frame sheet is disposed inside an air flow passage formed by the enclosing wall and closely contacts the air flow passage by its periphery. The cover film includes a central connection portion fixed to a central portion of the frame sheet, and a plurality of movable cover portions connected to the central connection portion. The cover film is between the frame sheet and an outlet of the air flow passage. The movable cover portions selectively cover a plurality of through holes of the frame sheet. The vibrating part is fixed on the frame sheet. When the vibrating part vibrates, the central portion and the central connection portion move together with the vibrating part so that the movable cover portions seal the through holes or move relative to the through holes.

An air flow generating device includes an enclosing wall, a frame sheet, a cover film, and a vibrating part. The frame sheet is disposed inside an air flow passage formed by the enclosing wall and closely contacts the air flow passage by its periphery. The cover film includes a central connection portion fixed to a central portion of the frame sheet, and a plurality of movable cover portions connected to the central connection portion. The cover film is between the frame sheet and an outlet of the air flow passage. The movable cover portions selectively cover a plurality of through holes of the frame sheet. The vibrating part is fixed on the frame sheet. When the vibrating part vibrates, the central portion and the central connection portion move together with the vibrating part so that the movable cover portions seal the through holes or move relative to the through holes.

A blowing apparatus includes a housing including an accommodating space and one or more blowing holes and a vibration apparatus in the accommodating space, wherein the vibration apparatus includes a first active vibration member, a second active vibration member connected to an inner lateral surface of the housing and connected to intersect with the first active vibration member, and a passive vibration member between the one or more blowing holes and the first active vibration member and connected to the first active vibration member.

A mobile power device capable of detecting gas is disclosed and includes a main body, a gas detection module, a driving and controlling board, a power module and a microprocessor. The main body includes a ventilation opening, a connection port and an accommodation chamber. The ventilation opening is in communication with the accommodation chamber. The gas detection module and the driving and controlling board are disposed within the accommodation chamber. The gas detection module, the power module and the microprocessor are fixed on and electrically connected to the driving and controlling board. The power module is capable of storing an electric energy and outputting the electric energy outwardly. The microprocessor enables the gas detection module to detect and operate. The microprocessor converts the detection information of the gas detection module into a detection data, which is stored and transmitted to the mobile device or an external device.