Some knowledge points of Danfoss hydraulic pump
Danfoss hydraulic pumpManufacturers believe that the power component plays a role in providing power source for the system and is an indispensable core component of the system. The hydraulic system uses a hydraulic pump as a power component to provide a certain flow and pressure for the system. The hydraulic pump converts the mechanical energy output by the prime mover (electric motor or internal combustion engine) into the pressure energy of the working fluid, which is an energy conversion device. The performance of the hydraulic pump will directly affect the reliability and stability of the hydraulic system. Hydraulic pumps all work on the principle of sealing volume change. Therefore, it is generally called a positive displacement hydraulic pump.
Danfoss hydraulic pumpManufacturers believe that the basic characteristics of hydraulic pumps:
1. There are several sealed spaces that can change periodically.
2. The pressure of the liquid in the tank needs to be equal to or greater than atmospheric pressure.
3. There is a corresponding traffic distribution mechanism.
Danfoss hydraulic pumpManufacturers believe that the reasonable selection of hydraulic pumps is essential to reduce the energy consumption of the hydraulic system, improve the efficiency of the system, reduce noise, improve work performance, and maintain the reliable operation of the system. Due to the outstanding characteristics of various hydraulic pumps, their structure, function and working methods are different, so the appropriate hydraulic pump should be selected according to different occasions.
The development of hydraulic pump is moving in the direction of high pressure and high speed, and it also puts forward higher requirements for the leakage of hydraulic pump. There are two main forms to prevent hydraulic oil leakage: static seal and dynamic seal, which are used to prevent or reduce the leakage of hydraulic oil in the hydraulic pump cavity to the outside of the pump cavity, while preventing external dust and foreign matter from entering the pump cavity.
Danfoss hydraulic pumpThe manufacturer believes that in general, the static seal of the hydraulic pump may achieve the ideal condition of zero leakage through legal planning, but it is difficult to achieve zero leakage for the dynamic seal, because any relative displacement of the contact surface creates the conditions for the leakage of the joint surface. The external leakage of the hydraulic pump as an important purpose, often pleading static seal is not allowed to leak, while the dynamic seal is given the purpose of leakage per unit time. As a form of dynamic seal, mechanical seal has the following advantages: low leakage, low material consumption, reliable use; low friction power consumption; long service life; the utility model has a wide range of applications and can be applied to low speed, high speed, high temperature, high temperature, high pressure.
Danfoss hydraulic pump manufacturers believe that high-speed hydraulic pump due to the high speed of the input shaft and transmission torque strength constraints, can not be very small, so the line speed is very high. In addition, the sealing pressure is high and the working temperature is high, so the rotating oil seal cannot meet the requirements. Therefore, mechanical sealing is a good solution. Sealing device formed by relative rotation. This isolates the external working fluid of the hydraulic pump from the external end. When the hydraulic pump works, the moving ring rotates with the shaft, and the fixed ring is firmly fixed in the end cover. Through the mutual friction of the mating surfaces of the progressive fixed ring, the sealing end face is formed to complete the dynamic seal.