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How do you determine the displacement of a gear pump?

In the field of hydraulics, many layers of information and reality coexist and define each other. A gear pump is itself dependent on its environment and interacts with everything else. But for the whole system to work, everything must be in its place and well oiled. So how can you be sure that the displacement of a gear pump is well defined and corresponds to its intended use? Find the answer here.

Gear pumps

Before we look at the displacement of these pumps, let's start by describing them. What is a gear pump? A gear pump is, to begin with, a pump that uses the combined profile of two gearwheels to initiate liquid displacement in a motor. These pumps are exclusively coupled to hydraulic motors and can only be used in hydraulics. They are therefore, logically, hydraulic pumps. There are two types of pump: simple pumps and internal pumps. A simple pump uses a rotor and a pinion, both of which drive each other to create a space to draw in the liquid product and inject it into our system.

The product being pumped then moves around this rotor/pinion pair until it reaches the outlet in the valves, which depend on it to operate. Internal pumps are used in the automotive and industrial sectors. They use a positive displacement principle. The pump is fitted with a card containing a double gear. This double gear combines a rotor with external gears and a pinion with internal gears, as well as a crescent to evacuate the liquid. As in the simple model, the interaction of the two parts here creates a suction effect, the purpose of which is to inject the displaced liquid into the crescent. These two pumps have their own advantages, interests and fields of application.

However, what unites them is the simplicity of their mechanics and the fact that their structure is compact, simple and therefore durable. What's more, these qualities make them highly energy-efficient and therefore very attractive for many specific professional applications in the industrial, technical or automotive fields.

Now that we've narrowed down our subject a little, let's look at what we're talking about today, namely the displacement of these pumps. What are they and how can we define them? Find out here!

The displacement of gear pumps

Using these pumps makes it fairly easy to estimate the pressure limits they will have to withstand in use. Their nature and construction mean that they are only useful in certain contexts, and pressures are often kept below certain extreme values.

As a result, their maximum pressure often remains below 200 bar, which has an impact on the displacement they need to operate. Common displacements for these pumps range from 0.25 cm3 to 250 cm3 for the most powerful.

These displacement volumes imply maximum operating pressures of 125 to 250 bar (for the higher ranges).

As we have seen, displacement is determined by how the pump will be used, which in turn has an impact on the maximum operating pressure bars the pump will have to withstand.

You therefore need to know the maximum pressure the pump will have to withstand in order to calibrate its displacement accordingly.

Here we have seen how to estimate and recognise the displacement of a hydraulic gear pump. See you soon for new articles!

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