The present invention relates to a ventilator, aiming easier cleanup even in the position mounted on the ceiling or wall. According to the present invention, a ventilator may comprise an outer casing having a mounting space in an inside thereof, an inner casing mounted in the mounting space of the outer casing, a blowing fan received in an inner space of the inner casing, and a motor rotating the blowing fan, wherein a wave-shaped flow path is formed on each inner wall surface of the inner casing.

A system includes an inlet duct disposed about an inlet axis, wherein the inlet duct is configured to direct an airflow along the inlet axis to a compressor inlet. The inlet includes an inlet heating system and a heating portion having a longitudinal axis that is substantially perpendicular to the inlet axis. The inlet heating system includes a first conduit substantially parallel to the longitudinal axis that is configured to distribute a heated fluid directly to the airflow via a first set of openings of a first end zone of the first conduit and a second set of openings of a second zone of the first conduit. The first end zone is configured to receive the heated fluid from a heating source, the second zone is coupled to the first end zone, and the second zone is configured to receive the heated fluid from the first end zone.

In the application disclosed are a wind shroud, which is used in a fan with a movable impeller, and a fan with the same. The wind shroud is integrally formed and comprises a body configured to be internally hollowed in an axial direction of the body for receiving the movable impeller. The body comprises an air inlet end and an air outlet end, and the air inlet end has an inner sidewall and an outer sidewall spaced apart from each other to form a silencing cavity for buffering the vibration generated when the movable impeller is rotated, so as to reduce the noise of the fan. In a direction from the air inlet end to the air outlet end, a distance between the inner sidewall of the air inlet end and the outer sidewall of the air inlet end first gradually increases, and then gradually decreases. In the above manner, where the wind shroud of the present application is applied to a fan, the noise problem of the fan can be effectively addressed.

One embodiment is a rotor system comprising a duct ring; a hub disposed centrally to the duct ring; first and second stators each connected between the duct ring and the hub; first and second control vanes rotatably connected to the first and second stators, respectively; a structural hoop having a first end connected to the first control vane and a second end connected to the second control vane, the structural hoop for translating rotation of the first control vane about a vane axis to the second control vane; and a mechanism for restricting at least one of forward-aft movement and side-to-side movement of the structural hoop relative to the duct ring.

The ideal design for a redundant orbitally driven electric ducted fan that can replace a family of current propeller and motor combinations in electric ducted fan designs by meeting air flow and pressure requirements while drawing less electric current to rotate and thus produce the required flow not only would reduce cost of operation over the life of the fan but opens new possibilities for electric powered vertical takeoff and landing vehicles with redundant drives improving safety of operation. The entry of flying machines using propellers and lifting fans such as hover bikes and quadcopters, manned or unmanned is driving a need to re-examine the application of force applied to rotate these fans to achieve a reduction in aircraft weight and increase flying time for a given battery charge or load of fuel.

Apparatus and methods are described including a left-ventricular assist device that includes a tube configured to traverse a subject's aortic valve, with a distal portion of the tube disposed within the subject's left ventricle. A frame is disposed within the distal portion of the tube. A pump disposed within the frame pumps blood through the tube. A distal-tip element defines a straight proximal portion that defines a longitudinal axis, and a curved distal portion that is shaped such as to curve in a first direction with respect to the longitudinal axis before passing through an inflection point and curving in a second direction with respect to the longitudinal axis, such that the curved distal portion defines a bulge on one side of the longitudinal axis. Other applications are also described.

In accordance with the inventive concepts, provided is a wearable device for personal thermal comfort. The device can take the form of a wearable fan comprising a U-shaped housing including a first arm having a central first axis and a second arm having a central second axis connected by an intermediate curved member. The device includes a first fan assembly disposed at a distal end of the first arm, comprising a fan, at least one air inlet, and least one air outlet directed off-axis from the first axis. The device can further include a second fan assembly disposed at a distal end of the second arm, comprising a fan, at least one air inlet, and least one air outlet directed off-axis from the second axis. The device can include a rear plate for cooling and/or heating. The device, in some embodiments, can be structured to be worn around a neck.

A handheld blower including a housing, an air duct defining a duct axis, the air duct including an air inlet and an air outlet opposite the air inlet, and a handle. The handle at least partially defining a battery receiving cavity configured to receive at least a portion of a battery pack therein, where the handle defines a grip axis, and where the grip axis is parallel to the duct axis.

A propeller-less unmanned aerial vehicle having a body having a plurality of channels, an inlet formed in the body and configured to allow air flow to enter the plurality of channels from an exterior of the body, an anechoic chamber formed in the body and coupled to the plurality of channels, a rotor comprising a plurality of angled fins located in the anechoic chamber, a control system configured to direct air flow within the plurality of channels, and one or more circular tubes coupled to the exterior of the body and in communication with the plurality of channels. The air flows into the body through the inlet, into the plurality of channels and the anechoic chamber, and exits through the one or more circular tubes to provide lift and directional control to the propeller-less unmanned aerial vehicle.

A hot fairing structure for a pre-diffuser includes a ring-strut-ring structure that comprises a multiple of hollow struts and a multiple of inlets to a respective diffusion passage, one of the multiple of inlets formed between each one of the multiple of hollow struts located between two diffusion passages.