45results about How to "Avoid air turbulence" patented technology

A foreign particle eliminating function and durability of an engine may be improved by an intake duct system having a cyclone duct including a cyclone module for generating torque of air, wherein the cyclone module includes: a central shaft; a plurality of cyclone blades that are formed outward from the central shaft; and a turbulence preventing device that is formed at a downstream side of the central shaft of the cyclone module so as to prevent turbulence of the air that has passed the cyclone blade.

A flutter test model is provided that utilizes a novel approach for fixing wing elements to an elastic spar, resulting in reduced airflow disturbance. A test wing has an elastic spar that simulates the elasticity of a wing of an actual airplane, and a plurality of wing elements that simulate the external shape of the wing of the actual airplane. A pair of fore and aft anchor members are fixed to the elastic spar by bolts, the wing element that is formed by stereolithography is fitted around the anchor members from the wing tip side, and the wing element is fastened to the anchor members by bolts that run through the wing element from the wing tip side. A weight, which is a tungsten rod, is housed in a weight support hole formed in the wing element. The anchor members and the bolts are not exposed on the surface of the wing element and the airflow over the surface of the test wing is not disturbed when a flutter test is carried out in a wind tunnel, thereby enhancing the accuracy of the flutter test.

A magnetic head supporting apparatus having a magnetic head for reading and writing information on a magnetic disc, a slider for mounting said magnetic head, and a suspension for supporting the slider. An IC chip for controlling a signal of the magnetic head is mounted on a heat insulating substrate, and the heat insulating substrate is mounted to the suspension.

An aerodynamic reducer for a trailer comprising one or more sheet members which are secured to the lower ends of at least some of the cross-members positioned beneath the floor of the trailer. The sheet members enclose the space between at least some of the cross-members.

The invention discloses a constant-temperature and constant-humidity test machine. The constant-temperature and constant-humidity test machine comprises a test machine casing, wherein a test box is arranged in the test machine casing, the test box comprises a box body and a test chamber which is arranged in the box body, a circulating air duct is formed between the box body and the test chamber, the circulating air duct is communicated with the test chamber, gas uniform distribution devices are respectively arranged at an air inlet and an air outlet of the circulating air duct, each gas uniform distribution device comprises a first meshed plate and a second meshed plate which are sequentially arranged towards the interior of the circulating air duct, a plurality of mesh holes are respectively formed in the first meshed plate and the second meshed plate, and the hole diameters of the mesh holes of the second meshed plate are sequentially reduced from the upper part to the lower part, or the number of the mesh holes of the second meshed plate is sequentially reduced from the upper part to the lower part. The flow speed of gas from the upper part to the lower part can be controlled through the first meshed plate and the second meshed plate so as to ensure uniform gas flow in the test chamber and avoid air flow turbulence phenomena. As a result, the constant-temperature and constant-humidity test machine can meet the requirement of low-flow rate tests.

A speaker system includes a main speaker and a subordinate speaker arranged around the main speaker. A pseudo-spherical wave is generated around the main speaker as a whole such that both speakers are vibrated in the frequency range of piston vibration and are in phase and that the propagation speed of a sound wave produced by the vibration of the subordinate speaker is preferably lower than the propagation speed of a sound wave produced by the vibration of the main speaker.

The invention discloses a dryer ventilating device and further provides a dryer using the ventilating device. The dryer ventilating device comprises a main air pipe (1) and fans (2). Air outlets (21)of the fans (2) are formed in the wall of the main air pipe (1) and communicate with the interior of the main air pipe (1). According to the dryer ventilating device, parts such as impellers which arearranged in an air channel are omitted, and the mode that the fans generate airflow and drive air is adopted, so that the stable air pressure and air speed are formed in the main air pipe, and the drying process is stably conducted advantageously; and meanwhile, the outlet air pipe does not need to be lengthened, and thus energy saving is better achieved.

The invention discloses a method and a device for protecting harmful bacteria and viruses in a densely populated area, and belongs to the technical field of pathogenic bacteria and virus protection. According to the protection method, a single person enters a closed room for the single person so as to be subjected to cross infection protection. The protection device comprises a closed room where the single person is located alone, wherein a door, an air inlet and an exhaust pipe are arranged on the closed room; a negative pressure air suction cavity connected with the exhaust pipe is formed inthe closed room; a first sterilization device is arranged at the air inlet; and a second sterilization device is arranged on the exhaust pipe. According to the method and the device for protecting the harmful bacteria and the viruses in the densely populated area provided by the invention, by arranging the closed room where the single person is located alone, air entering the closed room and airexhausted out of the closed room are treated through the sterilization device, so that the air entering the closed room and the air exhausted out of the closed room are safe, a comfortable and safe environment space can be provided for people in the densely populated area, and pathogenic bacteria and virus cross infection is prevented. The protection device provided by the invention is reasonablein structure and low in cost, and the protection device and method are suitable for application and popularization.