When the pipe sealing ring is used for the cylindrical annular gap seal, if the sealing groove of the sealing ring is opened on the shaft, the nominal outer diameter of the sealing ring is equal to the outer diameter of the shaft; if the sealing groove of the sealing ring is opened on the shaft On the coupling member, the nominal inner diameter of the sealing ring is equal to the outer diameter of the shaft. The form, size and tolerance of the groove, surface roughness, etc. must be determined strictly in accordance with relevant standards.
The tolerance between the shaft and the hole (sealing gap) depends on the working pressure of the working medium, the hardness of the sealing ring, and the nominal diameter of the sealing ring (丫-shaped and V-shaped sealing ring) or the diameter of the section (0-shaped sealing ring). Standard selection. When the O-ring seal is used for the flat Ihl seal, the outer diameter of the O-ring seal should satisfy D, a(d}+2H) (d, the seal aperture, B is the minimum width of the fixed groove, and its size is 0. The cross-sectional diameter of the seal is related).
When the working pressure is 1OMYa, in order to prevent the 0-shaped sealing ring from being squeezed into the gap, a retaining ring can be arranged on the bearing surface of the 0-shaped sealing ring of the machine tool such as the pipe cutting machine and the numerical control pipe cutting machine, and the material of the retaining ring is PTFE. Ethylene, nylon 6, etc., the hardness is higher than the 0-shaped sealing ring 4 because the Y-shaped and V-shaped sealing ring only seals in one direction. If two-way sealing is required, two sealing rings need to be provided, and the two sealing rings are installed facing away from each other. The lip is facing the high pressure side.
In general, the Y-shaped seal ring can be used without a support ring, but in the case where the working pressure of the medium changes greatly and the relative sliding speed is high, a support ring is used to fix the seal ring. In order to apply the working pressure to the inner and outer lips of the sealing ring at the same time, to open the lip, several small holes must be made in the supporting ring. When the V-shaped sealing ring cannot be loaded from the axial direction, it can be installed by the slit (450), but the slits of the plurality of V-shaped rings should be staggered from each other to avoid affecting the sealing effect. When installing the sealing ring, it is convenient to install and not cut the sealing ring, and it should be in all parts that pass. For the end of the cylinder and the piston rod, the chamfer of 15-300 should be processed, and the chamfer should have sufficient length. Pay attention to the cleaning of the sealing ring to prevent the inclusion of iron filings, dust, cotton yarn and other debris during installation.
