Construction machinery hydraulic seal performance strain

In the process of the development of construction projects, the construction machinery operation plays an important role, mechanical engineering technology to become the enterprise development project construction of important research, engineering quality and production efficiency has an important influence. Fault diagnosis of hydraulic system provides direction is of great significance. Fault diagnosis of construction machinery hydraulic system, also need to apply to information monitoring hydraulic unit, only to find its combination of hydraulic systems running at the crux of the problem. Innovation and improvement of construction machinery hydraulic system maintenance and fault diagnosis technology, help improve the operation efficiency of hydraulic systems, ensuring the reliability of the hydraulic system operation.

Mechanical seals mechanical seal hydraulic seal during use is not able to withstand the axial force, if there is an axial force on the hydraulic seal mechanical seal mechanical seal is serious. Sometimes due to the pump axial force balance mechanism to improper design and manufacture, installation, use, etc., resulting in an axial force is not balanced out. Mechanical seals to withstand an axial force during operation gland temperature will be high, for the polypropylene-based media, will be melted at high temperatures, so the pump starts soon lose sealing effect, the pump stationary seal face appears intermittent spray leakage phenomenon.

Hydraulic seal mechanical seal ring is usually made dynamic and static ring, clamping element and the sealing element composition. Wherein the end face of the movable ring and stationary ring form a pair of friction, pressure ring by the liquid seal chamber face pressed to the end face of the stationary ring, and generate the appropriate pressure on the end face than the two rings and holding one pole thin liquid film to achieve the purpose of sealing. The pressing element to generate pressure, the pump can not operate in the state, but also to keep fit the end face, ensure the mechanical seal ring seal hydraulic medium does not leak, and to prevent impurities into the seal face. Mechanical seals hydraulic seals sealing element from the gap B ring seal and the shaft, and the role of static ring gland clearance C while the pump vibration, shock dampening effect. Mechanical seal in actual operation is not an isolated part, it is the combination with other components of the pump running up together, but the basic principle can be seen by the normal operation of the mechanical seal is conditional, for example: the shaft Clearance of not too large, otherwise it can not form a deputy friction pressure than the normal requirements; mechanical shaft seal mechanical seal hydraulic seal at the deflection can not have too much, or else face pressure will be uneven and so on. Only to meet external conditions like this, coupled with the good performance of the mechanical seal itself, to achieve the desired sealing effect.

Hydraulic seals: sealing ring when subjected to external forces generated stress, this stress will not permanently deform in a certain range, this condition is satisfied, a synthetic rubber is good. Commonly used are: FKM fluorine rubber / VITON DuPont, SIL silicone, NBR NBR, EPDM, HNBR, PU and so on;