Causes and solutions of hydraulic system leakage

The cause of the hydraulic system leakage

(1) Caused by design and manufacturing defects;

(2) Looseness of pipe joints caused by impact and vibration;

(3) Dynamic seals and mating parts wear each other (especially hydraulic cylinders);

(4) The oil temperature is too high and the rubber seal is incompatible with the hydraulic oil and deteriorates.

Solution of hydraulic system leakage measures

I. Solutions to design and manufacturing defects:

1, the selection of hydraulic components often in the hydraulic system leakage plays a decisive influence. In the selection and improvement of the product in line with the good selection of the best, the best selection of cheap principle.

2. Reasonable design of mounting surface and sealing surface: radial scratches shall not be allowed on the surface, and the pretightening force of the connecting screw shall be large enough to prevent surface separation.

3. In the process of manufacturing and transportation, it is necessary to prevent key surfaces from colliding and scratching. At the same time, the assembly debugging process should be strictly monitored to ensure the assembly quality. 4, do not get rid of the potential leakage of some hydraulic systems, must be eliminated.

Second, reduce the impact and vibration: in order to reduce the impact and vibration of the pipe joint loose caused by the hydraulic system leakage, can take the following measures: (1) use shock support to fix all pipes in order to absorb impact and vibration; (2) Use low impact valve or accumulator to reduce the impact; (3) Properly arrange the pressure control valve to protect all components of the system; (4) to reduce the use of the number of pipe joints, pipe joints as far as possible with welding; Use straight threaded joints, tee joints and elbows instead of taper pipe threaded joints; Try to use oil return blocks instead of each piping; For the use of the highest pressure, the use of bolt torque and plug torque during installation, to prevent the joint surface and sealing pieces are nibbled; Install pipe fittings correctly.

Three, reduce the wear and tear of the moving seals: most of the moving seals are precisely designed, if the moving seals are qualified for processing, installation, use reasonable, can ensure a long time relatively leak-free work.

From the design point of view, the designer can adopt the following measures to extend the life of the moving seal: 1. Eliminate the side load on the piston rod and drive shaft seal; 2. 2. Protect the piston rod with dust ring, protective cover and rubber cover to prevent impurities such as abrasive and dust from entering; 3. Design and select appropriate filtration devices and easy-to-clean oil tanks to prevent dust accumulation in the oil; 4. Keep the speed of piston rod and shaft as low as possible.

Iv. Requirements for static seals: The static seals prevent oil leakage between the rigid fixed surfaces. Reasonable design of seal groove size and tolerance, so that the installed seal to a certain degree of extrusion deformation to plug with the surface of the micro depression, and increase the internal stress of the seal to higher than the sealed pressure. When the stiffness or bolt preload is not large enough, the mating surface will be separated under the action of oil pressure, resulting in clearance or increase the clearance that may exist from the beginning because the sealing surface is not flat enough. With the movement of the surface, static seal becomes a dynamic seal. Rough mating surfaces will wear out seals, and varying gaps will nibble away at the edges of seals.

5. Control oil temperature to prevent deterioration of sealing parts: 1. High oil temperature of sealing parts will shorten the service life. 2, the use of oil and seal material compatibility is not reasonable.