First, the flow Q (m3 / h or m3 / s) Centrifugal pump flow is the centrifugal pump liquid delivery capacity, refers to the unit of time the volume of liquid delivered by the pump. Pump flow depends on the size of the pump structure (mainly the diameter of the impeller and the width of the blade) and speed. During operation, the actual amount of liquid that the pump can deliver is also related to the resistance of the tubing and the pressure required. Second, head H (m) Centrifugal pump lift, also known as the pump head, refers to the weight of a single fluid pump obtained by the energy. Pump head size depends on the structure of the pump (such as the size of the impeller diameter, the bending of the blade, etc. The current pressure on the pump can not be made from the theoretical calculations, the general test method to determine the pump lift With the experimental determination, that is, at the pump inlet with a vacuum gauge, the outlet with a pressure gauge, if not counting the difference between the two sections of the kinetic energy (ie Δu2 / 2g = 0), excluding the energy loss between the two sections f1-2 = 0), the pump head can be calculated by the following formula Note the following two points: (1) where p2 is the pressure gauge reading at the pump outlet (Pa); p1 is the vacuum gauge reading at the pump inlet Pressure, Pa). (2) Pay attention to distinguish between two different concepts of lift head (head) and lift height of the centrifugal pump.Head is the energy obtained after pumping the unit weight of the fluid through the pump.In a pipeline system, two sections (Including pump) listed Bernoulli formula and finishing Available where H is the head, and lifting height refers only to Δz a Example 2-1 is now measured the head of a centrifugal pump working fluid 20 ℃ water , Measured flow rate of 60m / h, the pump inlet vacuum gauge reading -0.02M pa, exit pressure gauge reading 0.47Mpa (gauge pressure), known vertical distance between the two tables 0.45m If the pump suction pipe and extrusion pipe diameter the same, try to calculate the pump lift. , H = 0.45mp = 0.47Mpa = 4.7 * 10Pa p = -0.02Mpa = -2 * 10Pa H = 0.45 + = 50.5m Third, the efficiency of the pump in the liquid transport process, the shaft power is greater than the liquid discharged to the pipeline from The power obtained at the impeller consumes part of the power due to volume loss and mechanical loss of hydraulic losses, while the efficiency of the centrifugal pump reflects the degree of utilization of the external energy by the pump.The efficiency value of the pump depends on the type, size, structure, Manufacturing accuracy and the nature of liquid transport. Large pump efficiency value higher, the smaller the value of small pump efficiency. Fourth, the shaft power N (W or kW) Pump shaft power that pump shaft power, its value can be pump Effective power Ne and efficiency η calculation, that is
Saliva Collection Kit
This product is used in collecting high-quality DNA/RNA samples from saliva and can be used in various biological experiments such as enzymatic hydrolysis, PCR, and next-generation sequencing. It is widely used for the collection and preservation of specimens in hospitals, scientific research institutions, and families. The collection process is easy and painless, and will not cause any damage or discomfort to the human body.
Features
♦ Contactless sample collection, less risk for healthcare workers.
♦ Suitable for all kinds of people, easy method to collect samples.
♦ Easy to use, non-invasive collection.
♦ Use medical PP material.
The Saliva Collection Kit is a complete kit made out of 100% polypropylene.
The funnel has been engineered to be intuitively easy to use and specifically designed to reduce user self-collection error by preventing flowback.
When saliva is captured in a sterile container, COVID-19 is stable at room temperature for up to seven days without the need for expensive reagents.
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