SU813054A1 - Double end seal - Google Patents

Description

The invention relates to a sealing technique and can be used to seal shafts between high and low cavities, gas pressure. The known hydraulic circulation system of a double mechanical seal, containing coaxially mounted floatation of the seal, forming an annular cavity with the body, a hydroaccumulator with a membrane reversing a gas cavity connected to the high-pressure gas cavity, and a fluid-filled, annular cavity connected to the annular cavity, connected to the high-pressure gas cavity, and connected with an annular bladder with an annular bladder and an annular bladder with an annular bladder. device for feeding and spring two-way switch .Ij. The disadvantages of this device are the complexity of the design, the possibility of leakage of the barrier fluid into the sealed cavity and its leakage into the atmosphere, which reduces the reliability of the seal. The purpose of the invention is to simplify the design and increase the reliability of the seal. The goal is achieved by the fact that fluid draining strips are formed in the housing, an additional hydraulic accumulator is inserted, similar to the main one, the floating seal is spring-loaded from the i-side of the gas cavity, the drain cavity communicates with the fluid cavity both batteries, with means for periodically communicating the sealing cavities with the cavities of the batteries., The drawing shows schematically the proposed double face compaction. The seal contains a shaft 1, case 2, in the cavity of which floating seals 3 and 4 are installed, forming an annular chamber 5 with the case. On the side of the high-pressure gas cavity 6, the floating seal 3 is spring-loaded 7. In case 2, a ring 8 is installed, forming with cover 9 and seal 10 cavity 11 drain fluid. Floating seals .; Nos 3 and 4 are fixed in axial position by spring rings 12. Cavity 6 (in close proximity to seal 3) is connected by channel 13, pipe 14 through electropneumatic valves 15 and 16 to hydraulic accumulator 17 and additional hydraulic accumulator 18. Both batteries

equipped with a separating membrane 19, forming a gas cavity 20 and a liquid cavity 21.

The gas cavities 20 through the means for periodic communication, the valves 15 and 16 communicate with the cavity b, and the liquid cavities 21 through the shut-off valves 22 and 23, the pipe 24 and the channel 25 communicate with the annular chamber 5. Additionally, the liquid cavities 21 are co-connected with the cavity 11 of the drain, through shut-off valves 26 and 27, pipe 28 and channel 29.

Seal works as follows.

During operation of the device from the high-pressure compacted gas cavity b through channel 13, pipeline 14 and through the open valve 15, gas enters the cavity 20 of the battery 17 and squeezes the barrier fluid from the cavity 21 through the open valve 22 through the tubular 24 and channel 25 into the annular chamber 5, in which the barrier fluid is under pressure equal to the gas pressure in the gas cavity 6. Therefore, leakage of the barrier fluid into the cavity b is excluded.

From the annular chamber 5, the sealing fluid flows between the shaft 1 and the seal 4 into the cavity 11 of the drain and further along the channel 29, the pipeline 28 and through the open valve 27 is discharged into the liquid cavity 21 of the battery 18. The valves 16, 23 and 26 are closed, and electropneumoclav 16 closed from the side of cavity b, but through its drainage cavity communicates with the atmosphere the gas cavity 20 of the battery 18.

When developing the sealing fluid from the battery 17 and discharging it into the battery 18, the valves 15, 22 and 27 are closed, and the valves 16, 23 and 26 are opened. The barrier fluid is supplied to chamber 5 from accumulator 18u and drained to accumulator 17. Now electropneumatic valve 15 is closed on the side of the gas cavity

6, and through its drainage cavity, the gas cavity 20 of the accumulator 17 communicates with the atmosphere, which ensures a free (without flow, the drain liquid to the accumulator 17 or 18, respectively.

The specific pressure to press the seal 3 to the end sealing surface of the housing 2 is provided by the springs 7. The seal 10 prevents leakage fluid from the discharge cavity 11 from escaping into the atmosphere.

Simplification of the seal design is achieved by eliminating an autonomous pumping device that serves to feed, and improving reliability by eliminating leakage of the barrier fluid into the gas-sealed cavity.

Claims (1)

1. USSR author's certificate No. 261055, cl. F 16 J 15 /: 1968. I IS ten nineteen