A combined packing ring

Abstract

The invention discloses a combined packing ring, and belongs to the technical field of sealing elements. The combined packing ring comprises a first ring body and a second ring body symmetrical to the first ring body, wherein a first ring groove is formed in the first ring body; a second ring groove symmetrical to the first ring groove is formed in the second ring body; a pure graphite ring is arranged between the first and second ring grooves; the surface of the pure graphite ring is matched with those of the first and second ring grooves. Compared with the prior art, the combined packing ring has the advantages that the surface of the pure graphite ring is matched with those of the first and second ring grooves, and line contact between the pure graphite ring and the ring grooves is replaced by surface contact, so that radial leakage can be effectively reduced; the pure graphite ring positioned on the middle part has certain rebound elasticity, and gets a reduction in the internal diameter and an increase of the external diameter when being squeezed by the upper and lower parts to tightly hold a shaft and a cavity wall, so that axial leakage is prevented; the combined packing ring also has the advantages of novel structure, convenience in disassembly, quick mounting and the like.

Description

technical field [0001] The invention belongs to the technical field of seals, in particular to a combined packing ring. Background technique [0002] Packing ring is a kind of mechanical seal product suitable for petroleum, chemical industry and some environments with strong corrosive media such as acid and alkali, and installed in various rotating equipment, reciprocating pumps, valves, etc. The common one is graphite packing ring, which has a ring structure. It is formed by winding and pressing flexible graphite through a mold after shearing. Its production and installation are relatively convenient, and it is one of the environmentally friendly sealing packings with high cost performance. [0003] However, the structure of the packing ring in the prior art is relatively simple, and the graphite material itself is relatively brittle and fragile. Furthermore, the joint between the upper end surface and the outer peripheral surface of the graphite packing ring and the joint ...

AI Technical Summary

Problems solved by technology

[0003] However, the structure of the packing ring in the prior art is relatively simple, and the graphite material itself is relatively brittle and fragile. Furthermore, the joint between the upper end surface and the outer peripheral surface of the graphite packing ring and the joint between the lower end surface and the outer peripheral surface of the graphite packing ring will be damaged during installation and use. It is easy to cause wear after encountering friction and collision, resulting in reduced sealing performance and easy leakage, which in turn will cause greater economic losses

Images