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What is the size requirement for the "groove width" of the groove of the O-ring seal?

Release time:

2019-06-01 12:30

Source:

O-ringWhat is the size requirement for the "groove width" of the groove?
 
The groove design of the O-ring includes determining the shape, size, accuracy and surface roughness of the groove. Dongsheng sealing ring tells you to seal against the movement, and the relative movement clearance should be determined. O-ring groove design principle is: easy processing, reasonable size, accuracy is easy to ensure, O-ring assembly and disassembly is more convenient. The following is an example of the rectangular groove of the O-ring to explain the design requirements of the groove width, groove depth, gap, groove wall roughness, groove notch and groove bottom fillet size.
 
1. O-ring of the groove of the "groove width" design three elements: 1. groove width must be greater than the O-ring after compression deformation of the large diameter. 2. Must take into account the O-ring in the movement of heat caused by the expansion and the swelling caused by the medium. 3. It must be ensured that there is a certain space in the groove when reciprocating so that the O-ring can roll freely. It is generally believed that the cross-sectional area of the O-ring should be at least 85% of the cross-sectional area of the rectangular groove. In many cases, the groove width is 1.5 times the cross-sectional diameter of the O-ring.
 
Matters needing attention in the design of the "groove width" of the groove 2. the O-ring seal: the groove of the 1.O-ring seal should not be too narrow. If the cross-section of the O-ring seal fills the cross-section of the groove, the frictional resistance during movement It will be particularly large, because the O-ring seal cannot roll at some time, and it will also cause serious wear. 2. The groove should not be too wide, because when it is too wide, the O-ring seal has a large range of travel and is easy to wear. Especially when the static seal, if the working pressure is pulsating, then the static seal will be "not static", it will be in the inappropriate wide groove with the same pulsating frequency swimming, abnormal wear, O-ring soon damaged.
The importance of the groove wall roughness of the O-ring groove?
 
The groove design of the O-ring includes determining the shape, size, accuracy and surface roughness of the groove. Dongsheng sealing ring tells you to seal against the movement, and the relative movement clearance should be determined. O-ring groove design principle is: easy processing, reasonable size, accuracy is easy to ensure, O-ring assembly and disassembly is more convenient. The following is an example of the rectangular groove of the O-ring to explain the design requirements of the groove width, groove depth, gap, groove wall roughness, groove notch and groove bottom fillet size.
 
Roughness of groove wall roughness (O-ring for static sealing does not move during operation, so the roughness of groove wall is Ra = 6.33.2μm. For O-ring seals for reciprocating motion, the roughness of the rolling groove wall and groove bottom in the groove should be lower due to academic qualifications, and it is required to be below Ra = 160μm. O-rings for rotary motion are generally stationary, and the roughness of the shaft is required to be Ra = 0.40μm or polished.

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