Comparison of the advantages and disadvantages of centrifugal pumps and gear pumps

I don't need to be very professional, just tell me the liquid suitable for delivery, any obvious shortcomings, etc. Sincerely!

Simply put: Centrifugal pumps have high efficiency and large delivery capacity, but low pressure. Not suitable for liquids with particularly high viscosity. The gear pump has low efficiency, but has high pressure, a certain self-priming ability, and a wide range of adjustable working conditions. Suitable for liquids with high viscosity.

It's not the same thing, there's no way to compare it

1 Gear pumps generally transport liquids with relatively high viscosity media, such as some oils. Centrifugal pumps have the characteristics of high speed, small size, light weight, high efficiency, large flow, simple structure, pulsation-free infusion, stable performance, easy operation and convenient maintenance. Generally, centrifugal pumps are preferred when the process conditions can be met. 2 The gear pump relies on the rotation of the gear to suck and discharge the liquid through the seal of the gear and the pump body. The centrifugal pump relies on the high-speed rotation of the motor to throw the liquid out of the flow channel inside the impeller.

There is a flow channel inside the impeller of the centrifugal pump to throw the liquid out. It has high efficiency and large delivery capacity, but low pressure. Not suitable for liquids with particularly high viscosity. Gear pumps have low efficiency, but high pressure and a certain self-priming ability. They are suitable for liquids with high viscosity, such as various oils. The biggest disadvantage of gear pumps is their high noise.

The centrifugal pump has a large delivery capacity, while the gear pump has a small delivery capacity.

The centrifugal pump relies on a high-speed rotating impeller to cause the liquid to obtain centrifugal force. The liquid is thrown out and thrown into the volute of the pump and then exported. The gear pump relies on the tooth grooves of the gear and the pump casing to form a sealed cavity. The liquid is squeezed out of this cavity. The gear pump can achieve accurate metering because the volume of the gear groove is constant. The centrifugal pump relies on the action of the rotating impeller on the liquid to transfer the mechanical energy of the prime mover to the liquid. Due to the action of the centrifugal pump, when the liquid flows from the impeller inlet to the outlet, its speed energy and pressure energy are increased. The liquid discharged by the impeller passes through the pressure chamber, and most of the velocity energy is converted into pressure energy and then transported out along the discharge pipeline. At this time, a vacuum or low pressure is formed at the impeller inlet due to the discharge of liquid. The liquid in the suction pool is forced into the inlet of the impeller under the action of liquid surface pressure (atmospheric pressure). Therefore, the rotating impeller continuously sucks in and discharges liquid. Centrifugal pumps are generally used to transport large amounts of liquid, and their characteristics are:: Great output. When a low lift is required, a single-stage or two-stage pump is generally used. When a high lift is required, a multi-stage pump (level 3 or above) is generally used. The gear pump is a positive displacement rotary pump. Its working principle is that one of the driving gears in a pair of meshing gears is driven by the motor to rotate, and the other driven gear meshes with the driving gear to rotate. When the two teeth gradually separate, the volume of the working space gradually increases, forming a partial vacuum. The liquid is sucked in through the suction pipe under the action of atmospheric pressure. The sucked liquid is squeezed and pushed out by the gear along the inner wall of the pump body. When the main and driven gears continue to rotate, the pump continues to suck in and discharge liquid. Gear pumps are generally used as metering pumps, which have small handling capacity but high lift. The dosage is easy to control. Type Centrifugal Pump Gear Pump Non-Positive Displacement Pump Positive Displacement Pump Flow Uniformity Uneven Constancy Becomes Constant with Pipeline Characteristics Wide Range, Easy to Reach Large Flow Small Flow Pressure Head Size Not Easily Achievable High Pressure Head Higher Pressure Head Efficiency Slightly Lower High Operation Flow Adjustment Small Amplitude Adjustment Use an Outlet Valve, Use the bypass valve to adjust the large flow rate, adjust the speed, and self-priming effect. Generally, there is no need to start the outlet valve. Close the outlet valve and fully open it. It is easy to repair and simple. The structure and cost are simple, cheap and compact, and requires high applicable range. The flow rate pressure head has a wide application range. Low pressure is suitable for small flow rate. High pressure head, high flow rate, is not suitable for high viscosity. Suitable for conveying high viscosity.

1 Centrifugal pumps generally transport liquids with relatively low viscosity media, such as some oils. Centrifugal pumps have the characteristics of high speed, small size, light weight, high efficiency, large flow rate, simple structure, pulsation-free infusion, stable performance, easy operation and convenient maintenance. Generally, centrifugal pumps are preferred when the process conditions can be met. 2 The gear pump is a process that relies on the rotation of the gear to suck in and discharge the liquid through the gear mesh and the seal of the pump body. It can provide higher pressure. Gear pumps are not suitable for liquids containing particulate matter.

Thank you everyone, your opinions are very helpful to me.

Centrifugal pumps and gear pumps are different types of pumps. The centrifugal pump is suitable for transporting low-viscosity (clean water) materials. Its efficiency is relatively low and the flow range is large. Domestic centrifugal pumps for general use are very cheap. For special occasions, imported centrifugal pumps dominate the world. Imports The gear pump is quite expensive to transport materials with relatively high viscosity, or lubricating materials (oils), and the outlet pressure is generally very high. The general application effect of domestic gear pumps is good, but it is not ideal under special working conditions (high temperature, high viscosity). Domestic gear pumps are cheap, but imports are expensive.