How can I reduce the pulsation amplitude during Injection Pump pumping?
The fluid enters the Pump Pump pump and is then pumped between the two rollers to form a "fluid pillow". Followed by a brief flow, because the back of a pump tube was blocked by the roller, once again the formation of "fluid pillow." So the cycle, it will form a pulsating, rather than smooth continuous fluid.
If you do not want this pulsation, you can use the pump pump lock adjustable degree of the Pump Pump head, which can reduce the degree of pulse 25%, because it makes the fluid pillow between the degree of slow down. However, in some applications, the pulse limits imposed by Injection Pump are more stringent. For this reason, the 25% reduction in pulsation is not enough. In this case, consider the other four measures to further reduce the pulsation: the use of staggered locking and more rollers of the Injection Pump pump head shape; with a staggered pulse with a multi-Injection Pump pump head; the use of pulsating buffer And the replacement of the discharge pipe. Timing also requires that the lock is exactly the same when the roller is at the TDC of the Pump Pump head. However, some of the injection pumps are loaded with six to eight rollers, and the design also adds staggered locking - that is, when the lock is at its maximum, the rollers have been diverted from the top of the Injection Pump The The combination of these two designs can be used to eliminate pulsation.
Two pump tubing cards (or pump tubing) with staggered locking can be mounted directly in different directions of the Pump Pump head, which allows the pump tubing in the two pump tubes to alternately reach the maximum degree of lock- The rollers are located just opposite the top dead center. With a three-way connector will be divided into two channels into the channel, at the exit and then a three-way connector will be two channels into one. This allows the fluid to flow alternately to the outlet of the tee joint. With six to eight rollers, the volume of the fluid pillow is almost the same as the volume of the cutoff. Thus, each fluid pillow in a channel can just fill the cut-off portion of the other channel. As a result of the increase in the roller, so the fluid pulse frequency increases at the same time the amplitude is reduced. In this way, the pulsation can be substantially eliminated. This approach is particularly suitable for fluids with flow rates below 460 ml / min.
For fluids with a flow rate of 460 ml / min or more, it is also possible to install two tubing cards (or pump tubing) with staggered locking, although the effect is slightly less. The two Injection Pump tubing heads can be connected in parallel. Both of the Pump Pump heads are designed to have the greatest degree of locking when the roller is at the TDC of the Pump Pump head but requires the rotation of the two rotors Just staggering each other. When the injection pump position is staggered to reach 50% of the roller distance when the best results. In this configuration, the rollers do not reach the top dead center at the same time, so that fluid pincers and interrupts are alternated between adjacent two channels. If the inlet and outlet ends of each channel are connected by means of a tee joint, the fluid pillow in one channel can just fill the cut-off portion of the other channel outlet. However, the volume ratio of the fluid pillow and the cut-off portion of the Injection Pump pump head is larger than the volume ratio produced by the Injection Pump with six to eight rolls. In this way, multiple fluid pillows from adjacent passages overlap each other, and the degree of pulsation can only be reduced by 80-95%.
The pulsation buffer may be mounted on the outlet line to reduce pulsation. When the pulsating fluid flows into the buffer vessel, the cavitation above the liquid absorbs the pulsating wave by 90%, so that the fluid tends to be gentle in the buffer.
It is not difficult to make a buffer container suitable for a variety of Injection Pump tubing sizes and a suitable size connector. The outlet position of the buffer should be close to the inlet position or above the inlet position. The outlet and inlet positions should be close to the bottom of the container to collect the air in the upper part of the container.
Changing the configuration of the Injection Pump tubing flow channel also reduces pulsation. Doubling the length of the drain pipe, and the use of silicone rubber such a soft Injection Pump pump material can also reduce the pulse up to 60%. A softer pump tube helps to absorb fluid pulsation, while longer drain lines can increase friction.