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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

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Dongguan Minz Rubber & Plastics Co., Ltd.

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Discussion on the phenomenon of "point" of rubber O-ring specifications and materials

Release time:

2019-05-29 12:30

Source:

On RubberO-ringThe phenomenon of "point-eating" of specifications and materials
 
Since the rubber is substantially incompressible, the volume of the o-ring seal must be less than the volume of the groove preventing the seal, otherwise excess rubber will be squeezed out of the interstices between adjacent metal elements. For typical hydraulic mechanical applications in the seal, the groove is generally 65-70 percent of the space filled by the seal ring gauge. However, the experiment proves that the O-ring seal has better effect in high-pressure gas application, more groove filling and higher extrusion degree.
 
1. what is the "extrusion" effect? What problems will be caused by insufficient extrusion and groove filling process? The sealing ring structure extrusion and insufficient groove filling degree may cause sexual decompression damage, that is, the frequency of decompression will occur, and excessive extrusion and groove filling will also make the working temperature higher, and the o-type seal is intended to expand when it comes into contact with certain media. Anti-extrusion seal, as mentioned above, the performance of the rubber sealing ring material is generally similar to that of a very viscous fluid. Under the action of operating pressure, the rubber sealing material will be squeezed into the gap on the low-pressure side of the shell. This effect is called "extrusion".
 
2. what is "point"? Will the working pressure affect the damage of the sealing material of the rubber seal ring? When the pressure is relatively gradually reduced, the rubber will recover and will not cause any damage to the surface. However, in response to a rapidly changing pressure cycle, the amount of rubber extruded does not have sufficient time to recover before the gap is closed, and is extruded out of the groove. Each subsequent pressure cycle will lead to more extrusion of the rubber sealing ring material, resulting in the failure of the sealing effect of the sealing ring. However, this process is called "point phagocytosis". In the dynamic application of the more common gap, although the sealing extrusion between adjacent metal sealing elements is inevitable, the extrusion gap formed by the assembly screw is also likely to occur in the static flange type sealing application.
 
O-type rubber sealing ring standardized application and form advantages
 
Rubber seals are widely used in various mechanical equipment seals, in the prescribed temperature, pressure, and different liquid and gas media, in the static or moving state of the sealing effect, but also to ensure the normal operation of the mechanical system. Dongsheng seals tell you that O-shaped rubber seals are suitable for all kinds of laser machinery and equipment, and are also one of the application sealing components for automobiles, hardware, electronic appliances, machinery and various instruments.
1. what are the advantages of O-type rubber sealing ring specifications and seal forms?
 
1. Compared with the seal, the O-type rubber sealing ring is suitable for a variety of sealing specifications and also has the form of dynamic and static sealing state;
 
2. At the same time, it is suitable for a variety of sealing motion forms, such as reciprocating motion, combined sealing operation, rotary motion, and axial reciprocating motion;
 
3, suitable for a variety of materials, size and groove have been standardized, strong interchangeability;
 
4. O-ring is already a standardized sealing element, so the design is simple, the structure is small, and the assembly and disassembly are convenient;
 
5, the rubber seal section structure is simple, and has a self-sealing effect, reliable sealing performance;
 
6, the rubber material can be properly combined with a variety of formulations to achieve the sealing effect of oil, water, air and various chemical media;
 
7. Suitable for a variety of different sealing media: oil, water, gas, chemical media or other mixed media;
 
8. The temperature of rubber material is wide, and the general use temperature is -45 ℃ ~ 260 ℃.

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