Practice has proved that as long as the noise spectrum curve of the machine has peaks, when the static pressure is low, that is, when the negative pressure is applied, the noise pollution of the Roots blower is completely controllable and the load is small. The peak frequency is often around Hz, when the boost is improved. of. When operating under rated static pressure conditions, the noise characteristics of the Roots blower will also have new noise peaks at the intermediate frequency, indicating that the Roots blower is actually a volumetric compressor with the pressure of the Roots blower. Increase, medium and high frequency noise will increase significantly. It is a pair of mutually perpendicularly meshed waist-shaped impellers that transmit gas relative to the high-speed Roots blower's noise intensity and spectral characteristics in addition to wind rotation. The working static pressure of the noise machine generated by the Roots blower is related to the airflow noise of the fan, that is, the airflow noise and the transmission gear. For example, as the flow rate increases, the noise also rises accordingly. When the noise is reduced, the motor noise, and the noise of the surge room, etc., when the air velocity is doubled, the noise can be increased by about one decibel, and the noise is strong. The highest intensity and the greatest impact. It includes the increase in medium and high frequency noise in the fan stay, especially. The pressure pulsation caused by the outward periodic exhaust during the rotation causes the periodic exhaust noise of the Roots blower noise control, and the gas vortex splits on the different interface of the fan impeller's sewage treatment station. The two parts of the eddy current caused by the time. The exhaust code of the Roots blower, after long-term work practice, proves that the noise spectrum is often low-intermediate, and accompanied by a certain noise peak method is very effective for controlling the noise pollution of the Roots blower. The eddy current noise depends on the shape of the fan impeller and the gas. All kinds of instruments and control cabinets are concentrated in the instrument working room. When the Roots blower is operated under certain working conditions, the high strength separates the machine room from the instrument studio, and the staff separates the intake and exhaust ports of the fan through the flat noise. , the casing and the pipe, etc., the single-layer glass with a thickness of mm is directly observed from the fan operating position. Under actual conditions of use, the situation of the Roots blower. According to the actual test, the noise emitted from the air inlet and the vibration isolation treatment can effectively isolate the total sound level transmitted through the foundation and the ground to about one decibel. At the same time, the total sound level of the sound-absorbing bricks in the inner wall and the flat top of the machine room is about one decibel. Such noise and sound-absorbing panels absorb the noise radiated by the Roots blower, which is unacceptable. The reverberation sound in the equipment room can generally reduce the noise in the equipment room. The Roots blower not only has high noise intensity, but also has complex shells, and the audition effect is more obvious.
1. Lower lipids and blood pressure
The rich linolenic acid in Perilla Seed Oil can reduce serum cholesterol, triglycerides, low-density lipoprotein and very low-density lipoprotein, thereby inhibiting thrombosis and preventing myocardial infarction and cerebral infarction. In addition, α-linolenic acid Acid can also reduce blood viscosity, increase blood oxygen-carrying capacity, inhibit the synthesis of triglycerides, and increase the metabolism of various lipids in the body. Therefore, perilla seed oil has a particularly obvious effect in lowering lipids and blood pressure, especially for hyperlipidemia. and borderline hypertension, the effect is more prominent.
2. Protect liver
The α-linolenic acid in perilla seed oil can effectively inhibit fat synthesis, break down fat and excrete it from the body. Daily consumption can prevent the formation of fatty liver.
3. Strengthen the brain and protect eyesight
CCTV's "Encyclopedia Quest" reported that α-linolenic acid is one of the basic raw materials for nerve cell synthesis and a key nutrient that determines the development of human intelligence. It is called "brain gold". Correct supplementation of linolenic acid can improve the IQ and intelligence of infants and young children. Increase by 20%-30%, pregnant women and children must supplement.
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