Throttle flow stability of the impact of those factors? Regardless of the type of orifice, the flow characteristics of the orifice to meet the general flow formula, that is q = KA T Δpm. Throttle orifice in the throttle flow through the cross-sectional area AT set, often require flow through the AT q to maintain stability, so that the implementing agencies to obtain a stable speed. However, the flow through the throttle valve is actually stable, but also with the following factors. ①before and after the throttle pressure difference Δp. When AT is constant, with the change of Δp, the flow rate q through the valve also changes, that is, the flow rate is unstable. Hydraulic system load often unscheduled, the load changes, the actuator pressure changes with the actuator connected to the throttle before and after the pressure difference Δp that changes, the flow will also change. Thin-walled hole m value of the smallest, so the load changes on the impact of thin-walled hole is also the smallest. ② oil temperature. Changes in oil temperature caused by changes in the viscosity of the oil, the general formula of the orifice flow K value changes, so that the flow changes. Obviously, the longer the orifice, the greater the impact; thin blade hole length is short, the most sensitive to temperature changes. ③ choke blocking and the minimum steady flow. Experiments show that in the pressure drop, oil temperature and viscosity and other factors remain unchanged, when the throttle opening is small, the flow will be unstable or even stop the phenomenon, a phenomenon known as blockage. The main reasons for the blockage are as follows: the high velocity flow at the orifice produces local high temperature, which causes the oil to oxidize and form the gum and precipitate, and even cause the ashes of the combustion of the carbon in the oil. These products are combined with the original impurities in the oil. Flow surface gradually form the adhesion layer, it continues to accumulate and continue to be washed away by high-speed flow, the flow is constantly fluctuating, the blocking layer appears blocked when the plug flow. Blocking causes system actuators to run at an uneven speed, so the throttle has a minimum flow limit that works fine (ie no flow and no more than 10% change in flow rate), the minimum steady flow of the throttle. In practice, there are two measures to prevent the throttle valve from clogging. ①oil to be precision filter. Practice has proved that, 5 ~ 10 μm filtration accuracy can significantly improve the blocking phenomenon. To remove iron pollution, the use of magnetic filters better. ② throttle the pressure across the appropriate. Large pressure drop, throttling energy loss, high temperature; the same flow, the pressure drop corresponding to a small flow area, easy to cause obstruction. The design is generally take pressure difference Δp = 0.2 ~ 0.3MPa. Read related articles hydraulic mechanism to reduce the impact of hydraulic shock method of hazardous liquids flow through the gap and constant ideal liquid flow cavitation and harm Author: Shengzhou Wei Delong Pumps XHB rotary piston pump, XHB rotor pump Widely used in oil depots, oil, unloading, cleaning the ideal pump, but also sewage treatment, filter press dedicated pump. Copyright: Reprinted "Throttle flow stability of the influencing factors?" Article must be linked to indicate the author and the original source and the statement, if you have any questions about this article, please submit to the author, will be the first time deal with.
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