How to prevent O ring seal twisting damage?

Hello, Lei Mingxin sealing ring, the fillet at the outer mouth of the sealing ring groove is designed to prevent scratching during the assembly of the O-ring. It generally has a smaller fillet radius, i.e., r=. This avoids the formation of a sharp edge in the area, prevents the O-ring from squeezing out, and allows the ring to be placed stably.

Lei Mingxin sealing ring" The fillet at the bottom of the groove is mainly designed to avoid stress concentration there. For the value of the radius of the fillet, the dynamic sealing groove can be taken r=, and the static sealing groove can be taken as half of the cross-sectional diameter of the o-ring, that is, r=d 2

In order to prevent the twisting damage of the O-ring, Pinzhuo recommends that the following points should be paid attention to when designing.

1) The concentricity of the installation groove of the O-ring seal should be considered from two aspects: convenient processing and no distortion.

2) The cross-sectional size of the O-ring seal should be uniform, and the sealing part should be fully coated with lubricating oil or grease during each installation. In some cases, a lubricated-soaked felt ring fueling device can also be used.

3) Increase the cross-sectional diameter of the O-ring sealing ring, and the cross-sectional diameter of the O-ring for dynamic sealing should generally be greater than that of the O-ring for static sealing; In addition, o-rings should not be used as seals for large diameter pistons.

4) When the O-ring seal is also torsioned and damaged at low pressure, the seal can be used to protect the retaining ring.

5) Reduce the surface roughness of the cylinder barrel and piston rod.

6) O-ring seals are made of materials with low coefficient of friction.

7) The O-ring can be replaced by a sealing ring that is not easy to twist.

In general, there are several situations in this situation:

First, the speed of movement is too fast. Method: Lip seal was used instead.

Second, there is eccentric movement. Method: Eliminate eccentric movements.

3. The roughness of the sliding surface is uneven. Method: Roughness of the sliding surface.

Fourth, twist during installation. Method: Pay attention to the installation and apply grease.

For rubber O-rings, deformation means that air tightness is not guaranteed, although it does not seem to be a big problem, it often leads to the leakage of the hydraulic system, and in serious cases, even machine failure, property and even personal **. How do we avoid O-ring deformation?

First of all, it is necessary to do a good job in the selection of rubber O-rings, its friction coefficient must be low, lubrication must be in place, and the contact surface must be smooth, not rough and stained. During the installation process, it is necessary to ensure the coaxiality of the installation, and the eccentricity must not be too large, and at the same time, it is also necessary to ensure the rationality of the sealing system, and the size error can not be too large.

O-ring sealing ring, referred to as O-ring, is a kind of rubber ring with a circular cross-sectional shape. O-rings are the most widely used seals in hydraulic and pneumatic systems. O-rings have good sealing performance, which can be used for both static sealing and dynamic sealing; Not only can it be used alone, but it is an essential part of many combined sealing devices.

It has a wide range of applications and, if the material is chosen properly, can meet the requirements of a wide range of media and a wide range of motion conditions. O-ring is a kind of extrusion seal, the basic working principle of the extrusion seal is to rely on the elastic deformation of the seal, causing contact pressure on the sealing contact surface, the contact pressure is greater than the internal pressure of the sealed medium, then no leakage occurs, otherwise leakage occurs.