6results about How to "Reduced separation loss" patented technology

A bidirectional air inlet three-dimensional flow fan driven by a coupler comprises a machine shell, an impeller is arranged in the center of the interior of the machine shell, the impeller is a three-dimensional flow impeller of a bidirectional air inlet structure, the impeller is fixed to a main shaft through a hub, the main shaft penetrates through the interior of the fan, and one end of the main shaft is connected with a motor through the coupler; the impeller comprises two front disc bodies, a shared rear disc body and a plurality of ternary twisted blades installed on the two sides of the rear disc body, the ternary twisted blade on any side is installed between the front disc body and the rear disc body, and the ternary twisted blades are evenly arranged on the two sides of the rear disc body in the circumferential direction at intervals and are in mirror symmetry. And the design molded line of the ternary twisted blade at the front disc body is deviated towards the rotating direction of the impeller compared with the design molded line at the rear disc body, so that the design molded line at the front disc body is not crossed with the design molded line at the rear disc body. The machining process of the blade is simpler, the production period and cost are reduced, and the air inflow of the fan is effectively increased through the design of bidirectional air inflow.

The utility model relates to the field of electronic equipment, in particular to a variable channel type heat dissipation cold plate which comprises an end cover and a heat dissipation cavity which jointly form a three-section type heat dissipation channel. The heat dissipation channel sequentially comprises a first heat dissipation channel section with the large width, a second heat dissipation channel section with the large width and a third heat dissipation channel section with the small width in the flow direction of cooling airflow. The first heat dissipation channel section is provided with a plurality of large-diameter hollow heat dissipation columns which are filled with phase change materials, the third heat dissipation channel section is provided with small-diameter solid heat dissipation columns which are densely arranged, and airflow transition is achieved between the first heat dissipation channel section and the third heat dissipation channel section through a flow guide plate of the second heat dissipation channel section; through the design of the differentiated heat dissipation columns, large-flow rapid heat dissipation is achieved in the first channel section, and the turbulence effect is enhanced in the third channel section; the heat dissipation efficiency and the temperature uniformity are remarkably improved by combining the transient heat absorption characteristics of the heat conduction boss in direct contact with a heat source and the phase change material; the structure is compact, and is especially suitable for heat dissipation requirements of high-power-density electronic equipment.

The utility model provides a flow guiding device of an air inlet of a centrifugal fan and the centrifugal fan, the flow guiding device is defined by a side wall rotating around the axis of the flow guiding device, and the side wall comprises a plane wall, a first curved surface wall, a second curved surface wall and a third curved surface wall which are sequentially connected in the axial direction; the plane wall is perpendicular to the axis of the flow guide device, the second end of the plane wall is tangentially connected with the first end of the first curved wall, the second end of the first curved wall is tangentially connected with the first end of the second curved wall, and the second end of the second curved wall is tangentially connected with the first end of the third curved wall; the position, with the minimum vertical distance from the axis of the flow guiding device, of the flow guiding device is located on the second curved surface wall or the third curved surface wall, and the minimum vertical distance is the throat diameter of the flow guiding device. According to the flow guiding device, the flowing state of the front disc of the impeller can be improved, the separation loss of airflow on the back faces of the blades at the front disc is obviously reduced, and the effects of reducing pneumatic loss and reducing noise are achieved.

The invention relates to the technical field of fans for power concentration motor train units, in particular to a traction ventilator with a wind sand abrasion prevention structure, which comprises an air inlet formed in the top end of a main air duct and an air inlet mounting plate movably mounted on the main air duct, and an abrasion prevention mechanism for preventing wind sand from abrading the inner wall of the main air duct is arranged in the main air duct. A noise reduction mechanism for reducing noise generated by operation of the fan is arranged in the main air duct, and a pressurization mechanism for increasing operation pressure of the fan is arranged in the main air duct. By arranging the anti-abrasion mechanism, sand and sand abrasion at the corner can be reduced, the centrifugal fan is suitable for the operation environment with severe sand and dust, by arranging the pressurization mechanism and adopting the mode of the centrifugal impeller and the double rows of guide blades (stationary blades), the separation loss of a low-speed area is reduced, the high pressure of the fan is guaranteed, and the efficiency is improved; the plate type blades with the sound level lower than A are adopted, matching between the blade outlet angle and the blade number is optimized, and the noise of the draught fan is greatly reduced.

This invention discloses a low-loss, high-efficiency grain threshing device, relating to the field of agricultural machinery and equipment technology. It includes a threshing drum, a concave screen, a forced-feed auger, and a flow guide hood. The concave screen is fitted around the outside of the threshing drum, the forced-feed auger is located at the feed end of the threshing drum, and the flow guide hood is fitted around the forced-feed auger and connected to the front end of the concave screen. The threshing drum is equipped with threshing elements. The threshing rods on the front, middle, and rear of the threshing drum are respectively a first threshing rod group, a second threshing rod group, and a third threshing rod group. The first threshing rod group consists of 3-4 rods per group, the second threshing rod group consists of 4-6 rods per group, and the third threshing rod group consists of 2-3 rods per group. The height of the second and third threshing rods is twice the height of the first threshing rod. The gap between the first and third threshing rods in the same group is greater than the gap between the second threshing rods in the same group. This invention is beneficial for improving threshing efficiency, reducing threshing losses, and achieving high-efficiency grain threshing with low loss.

The utility model provides a kind of animal serum sample collection device with precooling pipetting function, it is related to blood detection technical field, mainly for solving the problem of large blood sample separation loss in prior art. The animal serum sample collection device includes blood collection tube, pipette, cooling water jacket and pipette plunger, wherein, cooling water jacket is sleeved on blood collection tube, for cooling the blood in blood collection tube;Transparent pipette plunger can be sealingly inserted into blood collection tube, through the step hole is arranged in pipette plunger, small hole is slender in lower part, large hole in upper part can be inserted into pipette.The utility model separates serum, only about 1-3% of total serum is left in slender small hole, which greatly reduces the separation loss of serum sample.In addition, the utility model can also accurately remove gel layer to obtain pure blood cells, and the blood can be cooled to 2-8℃ within 3 minutes, to avoid blood clotting and other problems.