Fan performance can be adjusted based on real-time operating conditions. The fan can include a plurality of blades operatively connected to a rotor. The blades can extend radially outward from the rotor to a tip. A housing can substantially surround the fan. The housing can have an inner peripheral surface that defines an inner diameter. The inner peripheral surface can include a first portion and a second portion downstream of the first portion. The first portion can be adjacently upstream of the plurality of blades, and the second portion can be substantially aligned with the plurality of blades. A plurality of actuators being distributed in a circumferential direction of the housing. The actuators can be operatively positioned to cause the inner diameter of the first portion or the second portion to be altered. As a result, one or more performance characteristics of the fan can be changed.

A vane arm assembly for a gas turbine engine is provided including: a vane arm having a first end, a second end opposite the first end, and an aperture proximate the second end, the aperture being defined by an aperture wall; a vane stem extending through the aperture of the vane arm; a mechanical fastener retaining a position of the vane arm in the longitudinal direction of the vane stem; and an impedance clip partially enclosing a portion of the second end of the vane arm to provide redundant position retention of the vane arm in the longitudinal direction of the vane stem.

The present invention relates to a back flow prevention apparatus for a ventilator including: a shield part including an upper plate that covers one side of the ventilator through which indoor air is suctioned, a lower plate provided to a center of the upper plate, and a plate opening provided in the lower plate; and an opening/closing part fixed to the lower plate, and configured to close the plate opening by a self weight thereof and open the plate opening by a suction force of the ventilator, wherein the lower plate is formed at a lower position than the upper plate.

The present disclosure is directed to a shroud assembly for a gas turbine. The shroud assembly includes a casing and a shroud. The shroud includes a radially outer wall engaged with the casing. A radially inner wall integrally couples to the radially outer wall. The radially inner wall and the radially outer wall collectively define a pair of axially opposed cavities. The radially inner wall moves radially outward toward the casing when one or more gas turbine blades contact the radially inner wall.

Fan performance can be adjusted based on real-time operating conditions. The fan can include a plurality of blades operatively connected to a rotor. The blades can extend radially outward from the rotor to a tip. A housing can substantially surround the fan. The housing can have an inner peripheral surface that defines an inner diameter. The inner peripheral surface can include a first portion and a second portion downstream of the first portion. The first portion can be adjacently upstream of the plurality of blades, and the second portion can be substantially aligned with the plurality of blades. A plurality of actuators being distributed in a circumferential direction of the housing. The actuators can be operatively positioned to cause the inner diameter of the first portion or the second portion to be altered. As a result, one or more performance characteristics of the fan can be changed.

A vane arm assembly for a gas turbine engine is provided including: a vane arm having a first end, a second end opposite the first end, and an aperture proximate the second end, the aperture being defined by an aperture wall; a vane stem extending through the aperture of the vane arm; a mechanical fastener retaining a position of the vane arm in the longitudinal direction of the vane stem; and an impedance clip partially enclosing a portion of the second end of the vane arm to provide redundant position retention of the vane arm in the longitudinal direction of the vane stem.

A personal fanning assembly for cooling a user includes a shell that defines an interior space. The shell has a back that is open. A panel is coupled to the shell and defines a recess and a chamber in the interior space. The recess is configured to insert an electronic device of a user. Each of a plurality of holes that is positioned in the shell and the panel is configured to align with a respective functional element of the electronic device. A blower, which is coupled to the shell and positioned in the chamber, is configured to force air through an orifice that is positioned in a front of the shell onto the user. A plurality of slats extends between opposing edges of the orifice. The slats are positioned to shield the blower and are configured to direct the air that is forced through the orifice.

A cooling system for providing streamlined airflow is provided. The system includes a fan assembly that includes an inlet side and an outlet side. The fan assembly also includes an inlet fan guard connector located at the inlet side of the fan assembly and an outlet fan guard connector located at the outlet side of the fan assembly. The fan assembly also includes a lever housings located between the inlet fan guard connector and the outlet fan guard connector and a slots oriented between the lever housings and the inlet fan guard connector and the outlet fan guard connector, the plurality of slots configured to secure an additional modular component.

A bleed valve assembly of a gas turbine engine includes two or more valve segments extending circumferentially around a central longitudinal axis of the gas turbine engine, and a first splice bracket spanning a first joint between a first valve segment and a second valve segment of the two or more valve segments. The first splice is bracket secured to the first valve segment and the second valve segment. A second splice bracket spans a second joint between the first valve segment and the second valve segment. The second splice bracket is secured to the first valve segment and the second valve segment.

A vacuum pump, vacuum pump arrangement and method are disclosed. The vacuum pump comprises: at least one rotor; and a stator, an inlet for receiving gas during operation; and an exhaust for exhausting the gas. The vacuum pump comprises a shaft extending through a centre of said pump and comprising a plate mounted on an end of the shaft towards the inlet. The vacuum pump comprises control circuitry configured to control an axial position of the plate, a change in axial position of the plate providing a change in inlet conductance of gas to the vacuum pump. The plate is mounted such that it extends beyond the inlet in at least some axial positions of the rotor such that the plate is not on the same side of the inlet as the stator.