What is the appropriate speed of the melt pump

Today will discuss in depth the problem of the speed ratio of the melt pump.

When the displacement of the melt pump is necessary, because there is a correlation between the displacement and the speed ratio,

Q=q*n

Therefore, the height of the speed ratio immediately jeopardizes the size of the total flow of the gear pump.

If the speed ratio is too low, the amount of oil provided by the system software will be small, which will cause insufficient oil suction by the pump, causing noise, cavitation and other conditions.

If the speed ratio is too high, then the amount of oil provided by the system software will be insufficient, but the total flow will be reduced. Secondly, if the speed ratio of the gear oil pump is too high, the damage to the working pressure of the system software will increase, so the speed ratio of the gear oil pump should be Set in an effective indoor space.

Glossary

The rated speed ratio n is under the rated working pressure. According to the test results, it is strongly recommended that the speed ratio can be operated continuously for a long time and maintain high operation efficiency.

The maximum speed ratio n is the maximum speed ratio for the short-term operation allowed by the service period and characteristics under the rated working pressure.

The minimum speed ratio n is to ensure that the hydraulic gear pump works reliably, and the operation efficiency is not too low. The minimum speed ratio allowed.

People choose the gear oil pump speed ratio must be in the marked value section required on the template, otherwise it will make the gear oil pump work unstable.

From the above definition, people can also see that the speed ratio of the gear oil pump must be selected according to the rated speed ratio. Try not to choose the maximum speed ratio standard value. At this time, when the rated working pressure is 20MPa, it can be selected according to the rated speed ratio. This speed ratio is selected.

The standard value of high capacity and efficiency. This standard value is very important. It is the key parameter of hydraulic oil pumps. High capacity and low efficiency will cause the implementation of components to be weak and unable to increase the working pressure. Therefore, it is necessary to ensure that the gear oil pump has a high capacity Efficiency mark value. 92% on this table is a relatively high standard value.

So what is high-capacity efficiency? High-capacity efficiency refers to the ratio of the total flow under pressure to the total flow under full-load working pressure. The pressure refers to the working pressure when the component is loaded, and the full-load working pressure refers to the working pressure when there is no load. These two ratios mean that the capacity is high and efficient. Because part of the oil leaks in the gear oil pump, the total flow under pressure is somewhat larger than the total flow at full load.

It is the technical parameter of several types of common pumps. The speed ratio section on the graph means that the selected section can be used. Usually, it is not necessary to choose a larger or a smaller value. The marked value is standard.

In terms of high efficiency, melt pumps are highly efficient, vane pumps are second, gear oil pumps are more, and screw pumps are less.