50results about How to "Reduce air pressure loss" patented technology

The invention relates to a large-size lightbox ball, comprising a ball body, a support and an inflating device, wherein the ball body is made by clipping a high-strength composite flexible material according to a special spherical surface and then splicing the clipped materials; the support is arranged at the lower part of the ball body and comprises a bottom ring, a bottom beam, a first stand column, a second stand column, a third stand column, a strut, a tying ring and a top ring; and the inflating device is arranged on the support. Compared with the prior art, the large-size lightbox ball disclosed by the invention has the advantages of large spherical angle, a wider information propagation range, high integral lateral stability and wind resistance of a ball body structure, longer service life, and capability of reducing the consumed energy for compensating air pressure losses, and the support can be designed into different shapes according to the requirements on activity styles on the premise of preserving a consistent top ring form.

The invention relates to closed-circuit tunnels used for aerodynamic researches, sportsmen-parachutists training and other purposes. The inventive closed-circuit tunnel comprises a confuser, a working area, a diffuser, one or several return channels, a blower unit and turning bends having different flow deflection angle, wherein the bend having the smaller flow deflection angle is placed in a high-speed flow cross-section, whereas the bend having the greater flow deflection angle is arranged in a low flow speed cross-section. In a preferred embodiment, the tunnel comprises a first turning bend containing one turning gut for turning the airflow at 60 degrees, a second turning bend containing two turning guts for turning the airflow at 120 degrees, and a third turning bend containing three turning guts for turning the airflow at 180 degrees. The invention makes it possible to reduce air pressure losses, the drive power and a specific amount of metal per structure.

The invention discloses a novel PVC super-transparent thin film coiling device. The Novel PVC super-transparent thin film coiling device comprises a rack, rollers connected to the two ends of the rack correspondingly, lifting tables symmetrically arranged on the two sides of the rollers, and cross beams located above the rollers. Pressurization rollers are arranged above the rollers. Two bearing seats are symmetrically arranged at the two ends of the rollers. A first synchronizing shaft and a second synchronizing shaft are connected to the two bearing seats correspondingly in a sleeved mode. The ends, far away from the rollers, of the two bearing seats are symmetrically provided with a first swing device and a second swing device correspondingly. A first holding frame and a second holding frame are symmetrically connected to the first synchronizing shaft and the second synchronizing shaft through the first swing device and the second swing device correspondingly. A sliding rail is arranged between a first synchronous gear and a bear and slidably connected with an L-shaped hook plate. Lifting devices are symmetrically arranged on the side, far away from the L-shaped hook plate, of the rack and are connected with pipe hook plates. One sides of the lifting devices are provided with lever mechanisms. An inclined plate with a limiting switch is arranged between the L-shaped hook plate and the pipe hook plates. A first cylinder is arranged above the inclined plate. A controller is arranged above the first cylinder.

This invention relates to a kind of arrangement structure of cooling fin that can smoothly discharge condensed water that condense on the surface of the cooling fin. The feature of the superthin tube heat-exchanger is that hollow level header can make refrigerant flow through; several refrigerant tubes insert in the level header, so it can distribute the refrigerant that flow in the level header; cooling fin that set between the vertical refrigerant tubes said above. In this heat exchanger, several cooling fins are fixed between the above vertical refrigerant tubes with a certain distance. This invention can discharge the condensed water flow from top of the refrigerant tube more easy. This invention can achieve another effect that it can reduce the air pressure losing of the flowing air on the effect of the fan, and prevent the heat reducing.