What Is the Operating Point of the Slurry Pump?

What Is the Operating Point of the Slurry Pump?

A slurry pump is a centrifugal pump from the working principle. Conceptually, it refers to a machine that increases the energy of solid and liquid mixed media through the action of centrifugal force (the rotation of the pump's impeller), and converts electrical energy into A device for the kinetic and potential energy of a medium.

Working conditions refer to the working conditions of power equipment under certain conditions, that is, the correlation between various parameters. Each type of slurry pump has its own unique performance curve at a certain speed. The performance curve reflects the potential working capacity of the slurry pump itself. To achieve this effect when the slurry pump is in use, the outlet of the pump must be equipped with a pipeline to transport the liquid medium to a high place instead of spraying the pump head on the nameplate without connecting the pipeline. Then, for a specific slurry pump system, where does the slurry pump work on the performance curve? This is the problem of determining the operating point of the slurry pump.

What is the operating point of the slurry pump?

Understanding the significance of the operating conditions of the centrifugal slurry pump can better select the type of slurry pump. The condition of the slurry pump refers to the actual water output Q, head H, shaft power when the slurry pump is running N, efficiency n, etc., drawing these values on the head curve, power curve, and efficiency curve becomes a specific point. Because the slurry pump is connected to the pipeline, it must be restricted by the pipeline. The intersection of the characteristic curve of the slurry pump and the characteristic curve of the pipeline is the operating point of the slurry pump, which is also called the operating point. The operating point of the slurry pump reflects the instantaneous working condition of the slurry pump.

In addition to the capacity of the slurry pump itself, the specific location of the operating point of the slurry pump depends on other factors. The working condition of the slurry pump depends on three factors: the performance of the slurry pump, the performance of the pipeline, and the difference between the water level in and out of the pool. The change of any of these factors will change the operating point of the slurry pump, and the operating point of the slurry pump device is actually moving within a considerable range. There are two factors that determine the operating point of the slurry pump: ① inherent working capacity of the slurry pump; ② working environment of the slurry pump, such as the operating point of all the slurry pump products when the sewage is transported based on clearwater That is, the boundary conditions such as the layout of the pipeline system of the slurry pump and the changes in the water level of the pool and water tower.

It must be noted that there is a difference between the head (total head) indicated on the slurry pump label and the outlet head (actual head) during use. This is due to the resistance loss when the water flows through the water pipe and near the pipeline. Therefore, the actual head of the slurry pump is generally 10% to 20% lower than the total head, and the water output is correspondingly reduced. Therefore, in actual use, it can only be estimated according to 80% ~ 90% of the head and flow indicated on the sign.

The choice of supporting power for centrifugal slurry pumps can be selected according to the power indicated on the label. In order to make the slurry pump start quickly and safely, the power of the power machine can also be slightly greater than the power required by the slurry pump. Generally, It is better to be about 10% higher; if you have power, when purchasing a slurry pump, you can choose a matching slurry pump according to the power of the power machine.

In practical applications, the operating point of the pump: vane pumps such as centrifugal pumps are expressed by flow rate and corresponding head; volumetric pumps such as reciprocating pumps are expressed by pressure difference and corresponding flow amount: when expressed by the performance curve of the pump, the vane The intersection of the pump's flow and head curve, the pressure difference and flow curve of the positive displacement pump and the resistance curve of the pump discharge system is the operating condition point of the pump.

In summary, the operating point is an interval range, which refers to the working condition under certain conditions, that is, the correlation between various parameters. The determination of the operating conditions of the slurry pump is to determine the head H, the flow rate Q, the power N and the efficiency η of the slurry pump device during actual operation under the conditions of the slurry pump model, pipeline layout and inlet and outlet water levels. In order to check whether the selected slurry pump is economical and reasonable.

The operating point of the slurry pump is the intersection of the characteristic curve of the slurry pump and the characteristic curve of the pipeline. At the highest point of the efficiency of the slurry pump, the operating point increases with the increase of the pump flow rate. The operating point of the pump with the highest efficiency when loaded. The outlet valve is only a part of the characteristics of the pipeline. The opening degree of the valve has a certain regulating effect on the pipeline characteristics. This effect can be reflected on the pressure gauge at the outlet of the slurry pump. Generally, the valve opening degree is the best when it corresponds to the rated head. Operating point.

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