5results about How to "Improve flow field distribution" patented technology

The application provides a coiled tube heat exchanger using spherical clamping strips to fix tube bundles, and belongs to the technical field of heat exchange equipment, and comprises a central cylinder and a plurality of clamping strips with spherical protrusions arranged on the outer wall of the central cylinder. The upper surface of the clamping strip is provided with a spherical protrusion structure, and adjacent spherical protrusions constitute a heat exchange tube positioning element. The spacing between the spherical structures is optimized to match the arrangement of the tube bundles, and the outer surface of the central cylinder is wound with heat exchange tubes. The clamping strip with the spherical protrusion adopts a reverse stamping process in the manufacturing process, so that the processing surface is located on the non-contact side of the heat exchange tube, effectively avoiding direct friction damage of the processing defects to the tube wall. The spherical streamline structure reduces the turbulence intensity when the shell side fluid flows around, effectively reduces the shell side pressure drop while ensuring the positioning accuracy of the heat exchange tube, and improves the heat transfer efficiency of the heat exchanger. The clamping strip with the spherical protrusion omits the independent welding area required by the traditional tube clamp, thereby reducing the material consumption of the clamping strip.

This invention relates to the field of fuel cell technology and discloses a fuel cell heat dissipation system and control method for active balancing heat dissipation in unmanned aerial vehicles (UAVs). The fuel cell heat dissipation system includes a UAV heat dissipation assembly and an active balancing control subsystem. The UAV heat dissipation assembly includes a liquid cooling circuit and rotors disposed at the tips of multiple heat dissipation arms. The liquid cooling circuit includes coolant channels disposed inside the multiple heat dissipation arms. The coolant channels include in-arm liquid inflow pipes and in-arm liquid return pipes. Multiple in-arm liquid inflow pipes are arranged close to the inner side of the heat dissipation arms, and the multiple inflow pipes converge at the tips of the heat dissipation arms and connect to the in-arm liquid return pipes. The inflow pipes have an S-shaped variable diameter pipe structure, and their arrangement density gradually decreases from the root to the tip of the heat dissipation arm. The active balancing control subsystem includes a sensor group, an actuator group, and a controller. This invention can improve the reliability and flight safety of the UAV thermal management system.

The application discloses a bogie bottom drag reduction cladding plate and a high-speed train bogie, and the cladding plate comprises a torsion bar cladding plate for cladding a torsion bar of a bogie frame, a first cladding plate for connecting a cross beam on one side of the torsion bar, and a second cladding plate for connecting a cross beam on the other side of the torsion bar. The first cladding plate and the torsion bar cladding plate form a first flow guide slope, the second cladding plate and the torsion bar cladding plate form a second flow guide slope, and the flow guide directions of the first flow guide slope and the second flow guide slope are symmetrically arranged. The application guides the airflow originally acting on the region near the center pin hole and the torsion bar to the lower side of the torsion bar cladding plate, optimizes the partial cladding and flow guide of the originally complex and abrupt bottom profile near the center pin hole and the torsion bar, forms a relatively continuous bottom flow guide surface, weakens the direct interference between the airflow and the complex components of the bottom, reduces the local flow separation, backflow and vortex intensity, improves the bogie bottom flow field distribution, and further achieves the purpose of reducing the aerodynamic drag of the bogie region.

This disclosure relates to the field of pharmaceutical equipment technology. One embodiment of this disclosure provides an air jet mill with a collection structure for pharmaceutical use, comprising: a separation tank, an exhaust port, a pulverizer, and a connecting pipe. The exhaust port is located at the top of the separation tank, the connecting pipe is located on the pulverizer, the pulverizer is connected to the bottom of the separation tank through the connecting pipe, the discharge pipe is located at the bottom of the separation tank, and a collection and discharge assembly is located inside the separation tank and the discharge pipe. The separation assembly is located at the top inside the separation tank and includes an inner frame, which is fixed inside the separation tank and extends to the outside of the separation tank at one end. A rotating shaft is rotatably connected to the bottom of the inner frame. This technical solution solves the technical problem in the prior art where non-integrated collection systems result in long material transport paths and easy retention of fine particles on the inner wall of the pipe. Especially when processing viscous or hygroscopic drugs, the retained material may absorb moisture and clump, affecting subsequent collection efficiency and powder purity.

The utility model belongs to the technical field of vortex pump hydraulic design relates to a vortex pump's impeller structure, including pump body and impeller, the pump body includes water inlet, water outlet, snail room flow channel and pump end, the impeller includes wheel disc and blade, the impeller sets up in pump end, its blade bottom protrudes into the snail room flow channel of pump body, the structural design of impeller satisfies following condition: b2: the numerical range of D2 is 0.2 0.24, L: the numerical range of D2 is 0.33 0.41, wherein, b2 is the height of impeller blade, D2 is the outer diameter of impeller, L is the vertical distance of blade bottom end to water inlet. The vortex pump's impeller structure provided by the utility model can improve the hydraulic performance of vortex pump, shorten the development cycle and save the development cost.