What is the basic principle of hydraulic pump?

For hydraulic pumps, when the cam rotates to the descending part of the curve, the spring forces the plunger down to create a degree of vacuum where the oil in the tank enters the sealed volume at atmospheric pressure. Cam plunger so that the constant rise and fall, the sealing volume decreases and increases periodically, the pump will continue to absorb oil and oil discharge, so as to achieve the purpose of work. With the continuous use of such products, hydraulic pumps have also received more attention, then the basic working principle of hydraulic pump which aspects? What is the specific situation? What is the basic principle of hydraulic pump Hydraulic pump is a type of hydraulic components to provide pressurized hydraulic fluid, is a pump. Its function is to convert the mechanical energy of the power machine into the pressure energy of the liquid. Output flow can be adjusted according to the needs of the variable pump, called the quantitative pump can not be adjusted. Hydraulic system commonly used pump gear pump, vane pump and plunger pump 3 kinds. Gear pump: smaller, simple structure, less stringent requirements on the cleanliness of oil, the cheaper prices; but the pump shaft by the unbalanced force, serious wear and tear, leakage larger. Vane pump: divided into double-acting vane pump and single-action vane pump. This pump flow uniform, smooth operation, low noise, work pressure and volumetric efficiency than the gear pump, the structure is more complex than the gear pump. Piston pump: high volumetric efficiency, small leakage, can work under high pressure, mostly for high-power hydraulic system; but the structure is complex, high requirements of materials and processing precision, the price is expensive, the oil cleanliness requirements. Generally in the gear pump and vane pump can not meet the requirements of the plunger pump. There are some other forms of hydraulic pumps, such as screw pumps, but not as good as the above three kinds of universal. Of course, its function is to convert the mechanical energy of the power machine into liquid pressure energy, which is the most important. Whether a type of product can exist in the market for a long time not only needs the needs of the market, but more importantly is the promotion and innovation of such products. Nowadays, the social product is updated very fast, and the elimination of a lot of times is instantaneous . For such products as hydraulic pump, it faces the opportunity and pressure coexist, so the reality should cause enough attention of relevant personnel.