The fluid enters the pump head of the peristaltic pump and is accumulated between the two rollers to form a "fluid pillow." This is followed by a brief interruption, as the latter section of the pump tube is again blocked by the roller, again forming a "fluid pillow". This cycle reciprocates, creating a pulsating, rather than smooth, continuous fluid.
If this pulsation is not desired, a pump head with an adjustable degree of pump tubing can be used, which reduces the pulsation by 25%, as this slows the flow between the fluid pillows. However, some applications have stricter pulsation restrictions on peristaltic pumps. For it, the 25% pulsation reduction is not enough. In this case, consider using the other four measures to further reduce the pulsation: pump head shape with staggered locking and more rollers; multi-pump head with staggered pulsation; pulsation damper; and replacement The configuration of the discharge pipe. Timing also requires that the degree of locking is maximized when the roller is at the top dead center (TDC) of the pump head. However, some pump heads have six to eight rollers and are designed with staggered locking—that is, when the degree of locking is maximized, the rollers have turned away from the top dead center of the pump head. The combination of these two designs can be used to eliminate pulsations.
Two pump tube cards (or pump tube beds) with staggered locking can be directly installed in different directions of the pump head, which can make the pump tubes in the two pump tube beds alternately reach the maximum locking degree, the rollers are Just opposite the top dead center. The inlet is divided into two passages by a three-way joint, and the two passages are combined into one at the outlet by a three-way joint. This allows the fluid to pulsate alternately to the tee joint at the outlet. Since six to eight rolls are installed, the volume in the fluid pillow and the volume of the flow are almost the same. Thus, each fluid pillow in one channel can just fill the discontinuity in the other channel. As the roller is increased, the frequency of the fluid pulsation increases while the amplitude is reduced. In this way, the pulsation can be substantially eliminated. This method is especially suitable for fluids with a flow rate below 460 ml/min.
For fluids with a flow rate above 460 ml/min, it is also possible to install two pump tube cards (or pump tube beds) with staggered locks, albeit with a slightly lesser effect. The two pump heads can be connected in parallel. Both pump heads are designed to lock out exactly when the roller is at the top dead center (TDC) of the pump head; however, it is required that the rotational positions of the two rotors are exactly offset from each other. The best effect is achieved when the pump head position staggered to a distance of 50% of the roller distance. In this configuration, the rollers do not simultaneously reach the top dead center, so fluid pillows and interruptions alternate between adjacent channels. If the inlet and outlet ends of each channel are connected by a three-way joint, the fluid pillow in one channel can just fill the shut-off portion at the outlet of the other channel. However, such a pump head produces a volume ratio of the fluid pillow to the flow interruption portion that is larger than that of the pump head with six to eight rollers. In this way, a plurality of fluid pillows from adjacent channels overlap each other, and the degree of pulsation can only be reduced by 80-95%.
Pulsation buffer
A pulsation damper can be placed on the effluent line to reduce pulsation. When the pulsating fluid flows into the buffer vessel, the air pockets accumulated above the liquid absorb the pulsating waves by 90%, so that the fluid tends to be gentle in the damper.
It is not difficult to make a buffer container suitable for various pump tube sizes and a suitable size joint. The exit position of the bumper should be close to the inlet position or higher than the inlet position. The outlet and inlet locations should be close to the bottom of the vessel to collect air from the top of the vessel.
Changing the configuration of the pump tube flow channel also reduces pulsation. Multiply the length of the drain tube and use a softer pump tube material such as silicone rubber to reduce pulsation by up to 60%. A softer pump tube contributes to the absorption of fluid pulsations, while a longer drain line increases friction. Increasing friction increases the back pressure, thereby squeezing a number of pulsating fluids together to reduce pulsation.
Whitening keywords
Whitening
After all, Asians still appreciate pure white and flawless skin, with some spots on it, even if it is whiter, it is not so pure, and the whiter the skin, the more blemish-like spots appear. Therefore, spot removal is the top priority for whitening, and the complexion needs to be even and translucent in order to be proud of the whitening arena.
Whitening Gold
Glycyrrhizin is an active substance extracted from Glycyrrhiza glabra. It is known as "whitening gold" because of its powerful whitening effect. It is the most powerful ingredient found in vitro for whitening. Its ability to inhibit tyrosinase activity is better than Hydroquinone is 16 times higher and 1164 times higher than "arbutin".
Cosmetic whitening
Cosmetics can achieve the purpose of whitening from different angles by adding different functional ingredients.
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