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With regard to new battery research such as fuel cells and solar cells, MIT has been at the forefront of the world. Recently, a team from the MIT Department of Materials Science and Engineering published their research results: Lithium-ion batteries that can be "charged" in a matter of minutes.
This kind of battery differs from existing lithium batteries in that the electrolytes of ordinary lithium ion batteries or lithium polymer batteries are solid, and the electrolyte of such lithium ion batteries is a muddy black solid-liquid mixture. In the internal structure of the battery, half of the electrolyte "mud" acts as a positive electrode, and the other half of the "slurry" of different components acts as a negative electrode, separated by an ion membrane. To "charge" it is as simple as removing the discharged mud electrolyte and replacing it with a new electrolyte. The entire process takes only a few minutes.
This type of battery combines the advantages of lithium-ion batteries and lead-acid batteries: the electrolyte used is cheaper than traditional lithium-ion batteries, and the “charging time†is also short; the solid-liquid mixed electrolyte is also more portable and corrosive than the pure liquid state of lead-acid batteries. And the acidity is very weak, the unit energy density is also much larger than the lead-acid battery, weight has advantages. It is expected to replace the location of lead-acid batteries in automobiles and promote the development of new electric vehicles, or as a backup power source for power plants. The MIT press office described the application prospect of this kind of battery as a metaphor: “The charging of this kind of battery is as simple, fast and convenient as the refueling of natural gas as a fuel vehicle.â€
Turbine Centrifugal Fan
Features: Turbine centrifugal fan impeller adopts the international standard backward design, the perfect streamline structure, large openings into the center of the impeller inlet wind, the wind through the center port into the wind, resulting in a strong centrifugal force, by the backward tilt fan blades thrown off quickly Turbine structure design makes the wind turbine has a strong wind, wind pressure.
Highlights: Turbine centrifugal fan by the overload thermal motor protection of the outer rotor, high efficiency after the circular arc-shaped centrifugal impeller of two parts. All impeller mold production, high precision dynamic balancing machine calibration, with small size, high efficiency, air volume, small vibration, low noise, superior performance, easy installation and commissioning.
Application: Material: Made of PA6 plastic, plastic one molding process. Diameter size 155mm ~ 250mm.
Applications: Air purification equipment, factory equipment (printing equipment, chemical fiber equipment, etc.), medical equipment, fresh food cabinets, refrigeration cabinets, servo motors, inverters, pipe ventilation, dehumidifiers, etc.
Volute centrifugal fan:
Features: Volute centrifugal fan impeller driven by the motor rotation, the impeller blades forcing gas rotation, the gas to work, to increase its energy, the centrifugal force in the gas around the impeller thrown through the scroll casing will speed Can be converted into pressure energy, when the impeller gas is discharged, the impeller pressure is lower than the pressure inside the inlet, the new gas in the pressure difference under the action of inhalation impeller, the gas is continuously exported from the outlet.
Highlights: The fan is designed with a reasonable impeller angle according to the aerodynamics of air flow. Without any mechanical friction during operation, a reasonable blade shape line minimizes the noise. The optimized impeller minimizes the axial force and has an efficient impeller , And the static and dynamic balance correction, the machine running smoothly, without any damping device, the bearing amplitude is relatively small.
Application: Material: Aluminum die-casting frame, wind wheel made of galvanized sheet, surface black electrophoresis, size Diameter: 120mm ~ 160mm
Applications: Sterilizers, heat exchange systems, clean benches, air shower, laboratory equipment, etc.
choose the suitable fan
1, the first parameter to note are: air volume, total pressure, efficiency, sound pressure level, speed and motor power.
2, Centrifugal fan pressure can be divided into three categories: high pressure centrifugal fan P> 3000Pa, medium pressure centrifugal fan 1000≤P≤3000Pa and low pressure centrifugal fan P <1000Pa. Depending on the stupid physicality and chemical properties of the delivered gas and the use, etc., different types of centrifugal fans are selected.
3, taking into account the loss of air leakage pipeline system, calculation error, as well as the actual fan fan, wind pressure negative deviation, centrifugal fan selection, the general use of air flow rate of 1,05 ~ 1,1, wind pressure of 1,10 ~ 1,15 safety factor. In order to prevent long-term fan in low-efficiency operation, it is not appropriate to use excessive safety factor.
4, in order to make the fan stable operation, should make the fan work in the vicinity of its efficiency, the fan operating point is located in the performance curve of the full pressure peak point on the right (ie, gales side, and is generally located at full pressure peak 80%). Fan design efficiency of the selected conditions, not less than 90% of the fan efficiency.
5, the use of variable frequency fan, the total pressure loss should be calculated as the system rated pressure, but the fan motor power should be calculated on the additional 15% to 20%.
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