Shaft seal device for crude oil long-transmission-line large-displacement double-screw oil delivery pump and oil delivery pump

Abstract

The invention provides a shaft seal device for a crude oil long-transmission-line large-displacement double-screw oil delivery pump and the oil delivery pump. The shaft seal device comprises a shaft sleeve, a gland and an oil seal assembly; the shaft sleeve fixedly sleeves a rotating shaft, and the second end of the shaft sleeve is rotatably sleeved with a swivel nut ; one end of the gland sleeves the first end of the shaft sleeve, and the other end of the gland is fixedly connected with an end cover; and the oil seal assembly comprises an oil seal framework, an oil seal ring and a pre-tightening piece, a first open groove is formed in one side of the oil seal ring, a second open groove is formed in the other side of the oil seal ring, a first sealing lip and a second sealing lip are arranged on the inner side face of the oil seal ring, the first sealing lip is arranged in a protruding manner compared with the second sealing lip, and the pre-tightening piece is arranged in the second open groove. By means of the shaft seal device, spiral sealing is formed between the second end of the shaft sleeve and the swivel nut, parking sealing is formed between the first end of the shaft sleeve and the gland, and good sealing of the shaft ends is achieved; and when the first sealing lip is abraded, the second sealing lip abuts against the first end of the shaft sleeve, the sealing performance is good, the service life is long, and the maintenance frequency is reduced.

Description

technical field [0001] The invention relates to the technical field of pump sealing, in particular to a shaft seal device and an oil delivery pump for a long crude oil delivery line with a large displacement twin-screw oil delivery pump. Background technique [0002] With the development of industrial technology, pumps are widely used in electric power, chemical industry, petroleum and other industries, and the sealing of pumps is particularly important. Spiral seal is a non-contact dynamic seal, also known as non-contact dynamic seal; due to the low failure rate of spiral seal and basically no leakage, it has been widely used in centrifugal pumps and screw pumps used in various industries . In actual operating conditions, the single screw seal cannot complete the complete sealing of the pump body, and it needs to be supplemented with a parking seal to achieve the real sealing effect. The parking seal is an important part of the non-contact dynamic seal, however, the parki...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a shaft seal device and an oil pump for a long-distance crude oil transmission line with a large displacement twin-screw oil pump, aiming at solving the problem of Large-displacement twin-screw oil pumps with mechanical seals have high cost, heavy maintenance workload, leakage will occur after the dynamic and static rings are worn, and large-displacement twin-screw oil pumps with packing seals have poor sealing effect, which may easily lead to leakage of the conveying medium in the pump and packing rings. Both the sleeve and the shaft sleeve are susceptible to wear, which leads to seal failure, increases the maintenance frequency of the pump body and reduces the service time of the pump.

Images