Pressure & Speed & Flow & Efficiency of Hydraulic Pump


Hydraulic pump is the power component of hydraulic system. This article introduces Pressure & Speed & Flow & Efficiency of Hydraulic Pump. AJA Technology is a hydraulic pumps and motors manufacturer. Welcome to inquire.

.

The hydraulic pump is the power component of the hydraulic system. Its function is to provide pressure oil to the hydraulic system. From the perspective of energy conversion, it converts the mechanical energy output by the prime mover into the pressure energy of the liquid that is easy to transport. The hydraulic motor belongs to the actuator, which can convert the pressure energy of the input liquid into the mechanical energy of the rotation of the output shaft, which is used to drag the load to do work. According to the structure, hydraulic pumps and hydraulic motors can be divided into gear type, vane type, plunger type and other types.

Hydraulic Pump Pressure

The working pressure of the hydraulic pump refers to the pressure at which the pump outputs or inputs the oil during actual work, which is determined by the external load. The rated pressure refers to the highest pressure that can run continuously according to the test standard under normal working conditions. Its size is limited by the service life. If it is operated beyond the rated pressure, the service life of the pump will be shorter than the designed service life. When the working pressure is greater than the rated pressure, it is called overload.

Rotating Speed

The working speed refers to the actual rotation speed of the pump when it is working. The rated speed refers to the highest speed that can run normally for a long time under the rated pressure. If the pump exceeds the rated speed, it will cause insufficient oil absorption, generate vibration and loud noise, and the parts will suffer from cavitation damage and shorten the service life. The minimum stable speed is the lowest speed allowed for the pump to operate normally. At this speed, the volumetric efficiency of the pump does not decrease significantly, and it can work normally; the motor does not crawl.

Displacement Flow

Displacement refers to the volume of liquid discharged from the change of the geometric size of the sealed cavity for each revolution of the pump, and the common unit is ml/r. Displacement can be changed by adjustment to become variable pump, displacement can not be changed into quantitative pump. Actual flow refers to the flow at the outlet when the pump is operating. The general unit is L/min. Due to the internal leakage of the pump itself, the actual flow rate is less than the theoretical flow rate. Since the motor itself also has internal leakage, in order to achieve the specified speed, in order to compensate for the leakage, the input actual flow rate must be greater than the theoretical flow rate. It can be seen that the displacement is a natural property of the pump and is not affected by the use environment; the flow rate changes accordingly with the speed or the variable of the oil pump.

Efficiency

Volumetric efficiency, for a hydraulic pump, refers to the ratio of its actual flow to the theoretical flow. Generally, the ratio of the flow at the rated pressure of the hydraulic pump at the same speed to the flow at no load of the oil pump is taken. For hydraulic motors, it refers to the ratio of its theoretical flow to actual flow. Mechanical efficiency, for hydraulic pumps, refers to the ratio of its theoretical torque to the actual input torque. The actual output torque of the hydraulic motor is the torque after the theoretical torque overcomes the friction, so its mechanical efficiency is the ratio of the actual output torque to the theoretical torque. Overall efficiency refers to the ratio of the output power of the pump to the input power. The overall efficiency is equal to the product of the volumetric efficiency and the mechanical efficiency.

 

AJA Technology is a hydraulic pumps and motors manufacturer. We meet the needs of users with continuous innovation, high-quality products and perfect services. Our products can help you build your low pressure hydraulic system.If you have any questions about hydraulic pumps or hydraulic systems, please call or email us. We are more than happy to serve you.

 

 
480 Views

Comments