When the cooling temperature Te is 200K and the compression piston spring stiffness kcs is 20N/mm, the inflation pressure Par increases from 1MPa to 1.8MPa, and the resonance frequency f of the compressor increases from 46Hz to 55Hz. It can be seen that the cooling temperature is When Te is increased from 140K to 250K, the resonance frequency of the compressor is increased from 51 Hz to 53 Hz. Therefore, the resonance frequency is not only related to the stiffness of the leaf spring, but also related to the inflation pressure and the cooling temperature. This is because the resonance frequency of the compressor is close to the natural frequency of the compressor, and the natural frequency can be calculated by the following formula: fnc=12Ï€kcs+kcgasmc(1) where kcgas is the gas spring stiffness; mc is the mass of the compression piston assembly. When the inflation pressure increases, the gas spring stiffness increases, the natural frequency of the compressor increases, and the resonance frequency increases. When the refrigeration temperature decreases, the gas spring stiffness decreases, the natural frequency of the compressor decreases, and the resonance frequency decreases. Displacement Phase Test and Analysis of Refrigerator In the free piston Stirling refrigerator, the displacement phase difference between the ejector (expansion piston) and the compression piston has an extremely important influence on the refrigeration performance of the whole machine. In the experiment, the displacement displacement of the compression piston and the ejector is simultaneously measured by the strain gauge type displacement sensor. Generally, the lower the cooling temperature, the larger the displacement of the ejector is than the displacement phase of the compression piston. Refrigeration performance test and analysis of the refrigerator The change of the refrigeration capacity of the refrigerator with the refrigeration temperature was tested by changing the inflation pressure and the input work. As shown in the figure, the cooling capacity changes with the cooling temperature when the input work Pin is 150W under different inflation pressures. It can be seen that there is an optimal inflation pressure for a fixed refrigerator, and the optimal inflation pressure of the refrigerator is 1.5 MPa. With the increase of input power, the cooling capacity of the whole machine increases. Under the input power of 250W, the cooling capacity is 40W at 200K. With the increase of cooling temperature, the cooling capacity of the whole machine increases linearly, and the increase slope below 180K is smaller than The increasing slope above 200K indicates that the refrigerator is suitable for operation in the temperature range above 200K. Nitrogen Generator For Food Preservation Nitrogen Generator For Food Preservation,Industrial Liquid Nitrogen Generator,Nitrogen Generator For Industrial High Purity,Nitrogen Generator Overseas For Hospital Jiangsu Minnuo Group Co.,Ltd , https://www.mingngroupcn.com
Experimental Discussion on the Latest Form of Piston Cold Compressor Air Compressor
Experimental research and analysis of linear compressor resonance frequency test and analysis Free piston Stirling refrigerator adopts moving magnetic linear compressor. According to the simple harmonic vibration theory, the compression piston has the largest amplitude and the highest motor efficiency when operating at the resonant frequency. As shown, when the input rms current Irms is kept at 9A and the operating frequency is 52 Hz, the compression piston displacement SC reaches a maximum of 13 mm, so the resonance frequency of the compressor is 52 Hz.