The relationship between flow rate and displacement of melt g

The flow rate and displacement of the melt gear pump are two important parameters that have a close relationship with each other. The following is a detailed explanation of these two parameters:

1、 Displacement of Melt Gear Pump

The displacement of a melt gear pump refers to the volume of molten material discharged by the meshing of the gears during each revolution of the melt pump. The units are usually cc/r (cubic centimeters per revolution), cm ³/r (cubic centimeters per revolution), or ml/r (milliliters per revolution). This parameter directly reflects the amount of melt that the melt pump can transport per revolution and is an important indicator of the specifications of the melt pump.

2、 Flow rate of melt gear pump

The flow rate of a melt gear pump refers to the volume of melt conveyed by the melt pump per unit time, usually measured in cm ³/min (cubic centimeters per minute), cc/min (cubic centimeters per minute), or l/min (liters per minute). The flow rate depends on the displacement and speed of the melt pump, and can be calculated using the following formula:

Theoretical volumetric flow rate=displacement x rotational speed

Furthermore, if it is necessary to calculate the mass flow rate of the melt pump (i.e. the mass of melt transported per unit time), the density of the melt also needs to be considered. The calculation formula is:

Theoretical mass flow rate=theoretical volume flow rate x melt density

3、 The relationship between flow rate and displacement

From the above definition and calculation formula, it can be seen that the flow rate of the melt gear pump is directly proportional to its displacement. At a constant speed, the larger the displacement, the greater the flow rate; On the contrary, the smaller the displacement, the smaller the flow rate. Therefore, when choosing a melt gear pump, it is necessary to determine the appropriate displacement based on the actual conveying requirements to ensure that the flow rate is met.

4、 The difference between actual traffic and theoretical traffic

It should be noted that due to factors such as clearance and leakage inside the melt gear pump, the actual flow rate may be lower than the theoretical flow rate. Therefore, in practical applications, it may be necessary to adjust the design or operating parameters of the pump according to the actual situation to obtain the required flow rate.

5、 Application examples

Taking the 100CC melt gear pump as an example, when the speed of the melt gear pump is 30 revolutions per minute and the material density is 1, its hourly output can be calculated by the following formula:

Hourly output (KG/H)=CC × rpm × 60 × ρ/1000

Substitute numerical value: 100 × 30 × 60 × 1/1000=180KG/H

This indicates that the melt gear pump can deliver 180 kilograms of melt per hour under given conditions.

In summary, the flow rate and displacement of the melt gear pump are two closely related parameters that together determine the conveying capacity of the melt pump. When selecting and using a melt gear pump, it is necessary to fully consider these two parameters as well as the actual application requirements.

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