36results about How to "Improve airflow efficiency" patented technology

A midframe portion (313) of a gas turbine engine (310) is presented and includes a compressor section with a last stage blade to orient an air flow (311) at a first angle (372). The midframe portion (313) further includes a turbine section with a first stage blade to receive the air flow (311) oriented at a second angle (374). The midframe portion (313) further includes a manifold (314) to directly couple the air flow (311) from the compressor section to a combustor head (318) upstream of the turbine section. The combustor head (318) introduces an offset angle in the air flow (311) from the first angle (372) to the second angle (374) to discharge the air flow (311) from the combustor head (318) at the second angle (374). While introducing the offset angle, the combustor head (318) at least maintains or augments the first angle (372).

A cooling system is provided for a transition (420) of a gas turbine engine (410). The cooling system includes a cowling (460) configured to receive an air flow (111) from an outlet of a compressor section of the gas turbine engine (410). The cowling (460) is positioned adjacent to a region of the transition (420) to cool the transition region upon circulation of the air flow within the cowling (460). The cooling system further includes a manifold (121) to directly couple the air flow (111) from the compressor section outlet to an inlet (462) of the cowling (460). The cowling (460) is configured to circulate the air flow (111) within an interior space (426) of the cowling (460) that extends radially outward from an inner diameter (423) of the cowling to an outer diameter (424) of the cowling at an outer surface.

An offset butterfly valve with a valve body, air flow conduit extending there through, and an offset rotatably mounted valve plate. The air flow conduit has with no interruptions to impede air flow there through. Cross sections along any location of the conduit are essentially round and of equal diameter while the valve plate is the shape of an oblique cross section of the conduit and rotatably mounted therein. The valve plate axis of rotation is offset with respect to the center of the valve plate and further offset with respect to a center of the conduit. Rotation of the valve plate within the conduit is accomplished by providing two opposing indentations on the interior of the conduit which accommodate the maximum diameter dimension of the valve plate when the valve plate is rotated to an open position. The indentations do not interrupt air flow through the conduit or the sealing of the valve plate periphery which may be easily machined to seal with a sealing surface of the interior of the conduit. A valve plate shaft may be contained within the valve body or may be accesses by removable side mount blocks. Various activation, biasing, or latching mechanisms may be included on the valve plate shaft and the valve may be utilized as a check or a positive shut-off valve.

A midframe portion (113) of a gas turbine engine (110) is provided, including a compressor section (112) with a last stage blade (124). The compressor section (112) is configured to introduce a radial velocity component into an air flow (111) such that the air flow is discharged from the compressor section (112) at a mixed direction based on a combined longitudinal velocity component and radial velocity component. The midframe portion (113) further includes a manifold (121) to directly couple the air flow from an outlet of the compressor section (112) to an inlet of a respective combustor head (118) of the gas turbine engine (110).

A bi-directional single-phase motor includes a stator, a rotor and a control circuit. The rotor is coupled to the stator and rotates along a first direction or a second direction. The control circuit is disposed in the stator and has a first inductive element and a second inductive element. When the first inductive element is on and the second inductive element is off, the rotor rotates along the first direction. When the first inductive element is off and the second inductive element is on, the rotor rotates along the second direction.

The negative gauge pressure dynamic convection system for artificial limb system is to be attached to a residual limb of an amputee. The device provides thermal energy transfer from within an artificial limb to the ambient atmosphere through regulated cyclical differential pressure airflow into the sealed environment between both the residuum and the inside of the suspension liner of an artificial limb and as an alternate embodiment between the rigid socket and the outside of the suspension liner or a combination of both. The system may include a multi-ply surface area multiplying textile layer; a limb-conformable convection suspension liner; an artificial limb socket with an over-molded enclosure for system components; a convection manifold assembly; a convection control system, which includes a continuously operating airflow generation device, and a rising edge triggered negative gauge pressure regulation device, such as an electromechanical binary airflow proportioning device, or an alternate mechanical binary airflow proportioning device.

The invention relates to the technical field of fans, and particularly relates to a blade, an axial flow fan blade and a fan. The blade comprises a pressure surface, a suction surface, a blade root part, a blade top part, a front edge part and a rear edge part, wherein a cylindrical surface where the blade root part is located is defined as a blade root element surface, a cylindrical surface wherethe blade top part is located is defined as a blade top element surface, a cylindrical surface located between the blade root element surface and the blade top element surface is a 1/2 element surface, and a cylindrical surface located between the blade top element surface and the 1/2 element surface is a 3/4 element surface; and the maximum distance between the front edge part and the rear edgepart at the blade root element surface is l1, the maximum distance between the front edge part and the rear edge part at the 1/2 element surface is l2, the maximum distance between the front edge partand the rear edge part at the 3/4 element surface is l3, the maximum distance between the front edge part and the rear edge part at the blade top element surface is l4, and the values of 11, 12, 13 and 14 gradually increases. The outlet air speed can be effectively increased, the pneumatic performance of the blade is matched with a motor, and the air volume of the fan made of the blade is guaranteed.

The invention relates to the technical field of ventilation of mines or tunnels, and provides an unpowered ventilation device and tunnel, which comprise a ventilation duct and a blower assembly, wherein a first air inlet and a second air inlet are arranged on the ventilation duct; the blower assembly comprises a rotary fan and a vortex impeller, the rotary fan is arranged in an inner cavity of theventilation duct, a fan direction of the rotary fan is in an extending direction of the ventilation duct, the vortex impeller is arranged outside the ventilation duct, and the rotary fan is in transmission connection with the vortex impeller; and the vortex impeller is driven by air flow of the ventilation duct to rotate unidirectionally, and the rotary fan is driven by the vortex impeller to rotate unidirectionally. The vortex impeller rotates along with the air flow outside the ventilation duct, so that the fan direction of the rotary fan is guaranteed to be stable, and an air flow direction in the ventilation duct is guaranteed to be stable; in addition, the blower assembly can transfer kinetic energy of the air flow in different directions outside the ventilation duct to the rotary fan, so that the efficiency of the blower assembly is improved and the ventilation efficiency in the ventilation duct is improved.