Vacuum pump oil seal installation method
First, the oil seal in the shell hole installation method
Oil seal assembly shell surface roughness, surface quality is particularly important. In the assembly should be checked whether the debris on the inner wall, scratches, dust and sand casting, etc., should be used Special tooling will be a smooth seal into the shell seat seat hole.
Second, the oil seal installed in the shaft diameter of the oil seal is usually smaller than the shaft diameter, the formation of a certain amount of interference in the assembly of the oil seal can easily lead to lip damage. To prevent damage to the lip seal, the general use of conical shoulder or cone tooling assembly. The shaft with a thread, groove, spline, the use of tapered shaft shoulder assembly is invalid, and the need to use special assembly tools to protect the lip seal, that is, in the thread, groove, spline at a protective sleeve, to avoid Oil seal lip is sharp axis, thread, groove and spline damage.
Third, the skeleton seal installation procedures and assembly considerations:
1, received from the seal assembly, must be kept clean. Seal before installation Do not tear the wrapping paper too early to prevent debris from adhering to the oil seal surface and into the work.
2, do a good job before machining inspection procedures, oil seal the size of the various parts of the shaft and cavity size is consistent. Shaft and cavity end face processing to be smooth, chamfering no damage and burrs, to clean the assembly site. Shaft and seat hole should be processed with 15 degrees to 30 degrees of assembly chamfering, especially within the angle, can not have a slope, the proposed assembly of parts using fillet-shaped chamfer. In the shaft at the loading part can not have burrs, sand, iron filings and other debris, to prevent accidental damage to the lip seal, the cavity size and seal diameter and width to fit.
3, check the lip seal has no damage, deformation, spring off, rust, to prevent the oil seal in the transport process by the impact of external extrusion and impact damage to its roundness.
4, oil seal back to the oil line, we must first determine the oil seal installation direction and the relationship between rotation.
5, the assembly, should be between the oil seal lips appropriate amount of lithium molybdate added grease such as grease cleaning grease to prevent the shaft in an instant start, the lip caused by dry friction phenomenon, affecting the lip interference the amount. Sealing lip contact surface should not be machined thread traces. Seal the outer ring of the oil seal during assembly, wrap the keyway or step part on the shaft with hard paper, etc., and avoid scratching or overturning the oil seal lip, or press the oil seal inward with special tools such as guide oversized sleeve . Do not hard hit hard punching, in order to prevent deformation of the oil seal skeleton after breaking the spring failure. In the event of lip flanging, spring off and oil seal skew, it must be removed and reloaded.
6, the proper use of special installation tools to protect the lip from damage. Even a slight scratch is not allowed, otherwise easily lead to seal leakage. Recommended hydraulic equipment or sleeve tool installation, the pressure need not be too big, the speed should be uniform, to be slow.
7, when the oil seal into the shell, should be uniform pressure. When pressed into the oil seal can not be tilted into the hole, otherwise it will cause the oil seal outside the park deformation.
8, the assembly must pay attention to the installation direction, the need for internal seal, equipped with self-tightening spring side (grooved side) toward the inside of the cabinet and the dust lip outward.
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