Roller pump is a hydraulic component, which is composed of double-row roller, the pump body and an eccentric shaft pump body has a cylindrical cavity, the middle of an eccentric shaft, between the shaft and the pump body for the two rows of cylindrical Roller. Due to the eccentric shaft, relative eccentric direction in different positions with the same volume between the two rollers are also different; with this volume difference, coupled with the appropriate valve plate, oil absorption and drainage can be achieved. Advantages The main advantage of a flexible vane pump is that it can be installed in the most convenient locations for special applications. Unlike centrifugal pumps, they do not have to be limited to the overflow side, which is installed below the liquid level. They can therefore be installed in a safe place above the ground, thus avoiding the possibility of the pump or pipe being tripped or damaged by the vehicle. Another advantage is the reservoir configuration, which may not have a matching bottom outlet flange or valve if the reservoir (typically a barrel and can) is provided by an outside supplier. Some containers, such as rubber-lined reservoirs, can not open at the bottom; flexible pump can solve this problem by using a simple hose connection at the top of the reservoir. This tank can be installed either on the ground can also be installed under the ground, and do not set overflow inlet. Easy to use for the first time is also an important advantage of a flexible impeller pump, especially if there are unskilled operators during start-up. The start-up and subsequent operation of the flexible impeller pump only requires switching without a complicated start-up procedure. The Benefits of Roller Pump Maintenance Pumps are carefully arranged to simplify maintenance. The flexible impeller pump is installed above the liquid level to allow for emptying during maintenance, no longer having to be connected to the pipe, or full of fluid in the pump during service, resulting in fluid spillage when the end cap is opened. In contrast, the submersible pump is generally immersed in liquid easily forgotten until failure! Immersed in viscous, repulsive or corrosive liquids when they need to be repaired. It is therefore almost impossible to repair such a sealed pump, at least more than to repair a flexible impeller pump. Factors that affect the self-priming performance of flexible impeller pumps are baffles, air leaks and internal leaks. The outlet-side normally closed valves and baffles prevent the inlet side from creating a partial vacuum. Leakage of air on the inlet side and internal leakage of the impeller to the inlet side will prevent the formation of a partial vacuum (ensuring that the inlet fittings are sealed). For example, long-term abrasive belt materials cause serious scratches on the pump body The resulting leak. However, if the impeller is made of rubber, it adapts to the worn pump body shape because the rubber material is not significantly worn and flexible. Therefore, flexible pump impeller than other types of pumps (such as gear pumps) to maintain its long-term self-priming performance and volumetric efficiency must be retained between the rigid parts of a fixed gap. Flexible pump is a type of positive displacement pump rotor pump, because the elastic rotor blades to run flexibly named, also known as flexible rotor pump, flexible impeller pump. The earliest design dates back more than half a century ago when it was mainly used to clean the barges of oil and water in the tanks and flush the decks. However, due to its excellent performance and elastomer technology, flexible pumps are increasingly used in various industrial fields. Flexible pump has both the main features of positive displacement pumps, but also a special volume pump. Pulse-free flow, with the outlet pressure, the viscosity of the medium to reduce the flow characteristics and centrifugal pumps similar. In many industrial applications, centrifugal pumps are mostly used as a substitute for centrifugal pumps to solve problems that can not be solved by centrifugal pumps (media that can not be transported or working conditions that can not be adapted). There are many advantages of flexible impeller pumps in handling viscous fluids over centrifugal pumps. This paper discusses the working principle of the flexible vane pump and its many advantages in terms of installation, maintenance and use. Positive displacement pumps such as flexible vane pumps are used as a replacement for centrifugal pumps in many industrial applications. The flexible impeller pump, which was invented about 60 years ago, has obvious advantages over viscous pumps in handling viscous fluids. After the impeller turns the eccentric cam, the volume of the cavity per unit decreases. As the cell volume increases through the inlet tube, a partial vacuum is created and the atmosphere forces the fluid into the cavity. As the volume decreases through the outlet tube, the fluid is forced out of the cavity into the outlet tube. The key to flexible viscometer delivery of viscous fluids is that the flow rate is proportional to pump speed. There are two important things to consider here. The first is the friction loss inside the pump itself and the second is the frictional loss between the fluid and the pump inlet wall. Loss of pump friction increases fluid viscosity and results in a drastic drop in centrifugal pump performance. Although viscous friction can be reduced by reducing pump speed, decreasing centrifugal speed can result in a drastic reduction in pump performance, as centrifugal pump performance relies primarily on the speed at which the fluid passes through the impeller. Practical applications of fluid viscosity are limited up to 200-300 cP. The flexible impeller pump can reduce the internal friction loss caused by the viscosity by reducing the pump speed. The pump impeller blades can automatically adjust to speed, fluid viscosity and different pressures. How to get fluid into the pump is a major issue when transporting fluids. The pressure drop caused by the friction loss inside the inlet pipe is an important factor that hinders the fluid from entering the pump. To reduce friction losses, the size of the inlet pipe must increase with increasing viscosity. In addition, the inlet pipe should be as short as possible and not be bent. The harder the fluid is, the more difficult it is for the pump to lift the fluid. If the viscosity is too high, a supply tank with an overflow hopper should be installed above the pump position to provide a positive pressure head for the fluid.
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