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Some key points about Danfoss hydraulic pumps
Release date:
2023-04-03
Source:
Danfoss hydraulic pump manufacturers believe that the power element serves as the system's primary source of power and is an indispensable core component. Hydraulic systems rely on hydraulic pumps as their power element, delivering precise flow rates and pressure to meet operational demands.
Danfoss Hydraulic Pump Manufacturers consider the power component to be the system's vital source of energy, making it an indispensable core element. In hydraulic systems, a hydraulic pump serves as the power unit, supplying the system with both flow rate and pressure. The hydraulic pump converts mechanical energy—delivered by a prime mover (such as an electric motor or internal combustion engine)—into pressure energy within the working fluid, effectively acting as an energy-transformation device. Consequently, the performance of the hydraulic pump directly influences the reliability and stability of the entire hydraulic system.
Hydraulic pumps operate based on the principle of changing sealed volumes, which is why they are commonly referred to as positive-displacement hydraulic pumps.
Danfoss Hydraulic Pump The manufacturer defines the basic characteristics of hydraulic pumps as:
1. There are several sealed spaces that can change periodically.
2. The pressure of the liquid in the tank must be equal to or greater than atmospheric pressure.
3. There is a corresponding traffic allocation mechanism.
Danfoss Hydraulic Pump Manufacturers believe that the proper selection of hydraulic pumps is crucial for reducing energy consumption in hydraulic systems, enhancing system efficiency, minimizing noise, improving operational performance, and ensuring reliable system operation. Given the distinct features of various hydraulic pumps—each with unique designs, functions, and operating principles—they should be chosen carefully based on the specific application requirements.
The development of hydraulic pumps is trending toward higher pressure and greater speed, while simultaneously placing stricter demands on minimizing leakage. To prevent hydraulic oil from escaping, two primary sealing methods are employed: static seals and dynamic seals. These mechanisms help either entirely block or significantly reduce the leakage of hydraulic fluid from inside the pump chamber—preventing it from spilling outward—as well as keeping external dust and contaminants from entering the pump cavity.
Danfoss Hydraulic Pump Manufacturers generally believe that static seals in hydraulic pumps can achieve the ideal condition of zero leakage through proper design and planning, while dynamic seals are much harder to perfect in this regard, as even minimal relative movement between mating surfaces can create opportunities for leakage. To address external leakage—a critical concern—static seals are typically designed to prevent any leaks at all, whereas dynamic seals focus on limiting the rate of leakage over a given time period. Mechanical seals, as a type of dynamic seal, offer several key advantages: they deliver low leakage rates, minimize material consumption, and ensure reliable performance; they also feature reduced frictional power loss and boast an exceptionally long service life. Moreover, this practical innovation is highly versatile, making it suitable for applications ranging from low-speed to high-speed operations, as well as environments involving extreme temperatures, high pressures, and challenging conditions.
Danfoss hydraulic pump manufacturers believe that high-speed hydraulic pumps cannot be made very compact due to the limitations imposed by the high rotational speed of the input shaft and the strength of the transmission torque, resulting in extremely high linear velocities. Additionally, these pumps operate under high sealing pressures and elevated temperatures, making conventional rotary oil seals inadequate for the demands. As a result, mechanical seals emerge as an excellent solution—utilizing a sealing mechanism created through relative rotation. This design effectively isolates the pump’s external working fluid from the surrounding environment. During operation, the rotating (moving) ring spins along with the shaft, while the stationary (fixed) ring remains securely mounted inside the end cover. The dynamic seal is achieved via gradual friction between the mating surfaces of these two rings, forming a reliable sealing interface that ensures efficient dynamic sealing performance.
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