Packing seal pressure reduction structure for conveying high-pressure medium

Abstract

A packing seal pressure reduction structure for conveying high-pressure media comprises a shaft sleeve, a packing box is installed on the outer side of the shaft sleeve, packing, a packing ring and a packing gland are installed between the low-pressure side of the packing box and the shaft sleeve, the packing gland compresses the packing and the packing ring, and a labyrinth seal groove and a liquid accumulation groove are sequentially machined in the high-pressure side of the packing box. A pressure relief channel is machined in the stuffing box and communicated with the liquid accumulation groove, and a pressure relief water pipe is installed above the pressure relief channel. According to the utility model, the medium pressure at the packing sealing medium end is effectively reduced, and the sealing medium is converted from a high-pressure medium to a low-pressure medium; the packing pressing force is reduced, the abrasion of the packing and the shaft sleeve is slowed down, the service life of the packing and the shaft sleeve is prolonged, and the maintenance period is prolonged; the unit friction efficiency is improved; the utility model provides a solution for changing mechanical sealing of high-pressure medium sealing into packing sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a packing seal pressure reducing structure for conveying high-pressure media. Background Art

[0002] like Figure 2 As shown, the main shaft seal generally adopts packing seal, and the packing is installed between the stuffing box and the sleeve. It has the advantages of simple structure, low cost, low maintenance cost and convenient disassembly and assembly. When conveying low-pressure medium, the packing seal is tight and can generally reach 60 drops per minute. However, the disadvantages of the packing seal are very obvious when conveying high-pressure medium. There are mainly the following disadvantages: 1. When the seal is tightened to the standard leakage state, the packing and the sleeve are heated by friction due to the packing being pressed too tightly, causing serious wear of the sleeve and packing; 2. Low efficiency of the unit; 3. Frequent maintenance and high operating cost; 4. If the packing is operated in an uncompressed state, it will not play a sealing role and the sealing part will leak seriously. Mechanical seal must be used to meet the sealing requirements. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a packing seal decompression structure for conveying high-pressure medium in view of the deficiencies of the above-mentioned prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A packing seal decompression structure for conveying high-pressure medium comprises a shaft sleeve, a stuffing box is installed on the outer side of the shaft sleeve, packing, packing ring and packing gland are installed between the low-pressure side and the shaft sleeve of the stuffing box, the packing gland presses the packing and packing ring, the stuffing box is sequentially processed with a labyrinth seal groove and a liquid accumulation groove on the high-pressure side, a pressure relief channel is processed on the stuffing box, the pressure relief channel is connected with the liquid accumulation groove, and a pressure relief water pipe is installed above the pressure relief channel.

[0006] Furthermore, the labyrinth sealing groove is composed of a plurality of 5x5mm annular grooves, and the distance between the annular grooves is 5mm.

[0007] Furthermore, the packing ring is located between the packings, and a lubricating water interface is processed on the stuffing box, and the lubricating water interface is connected to the packing ring.

[0008] Furthermore, a liquid receiving pan is arranged below the stuffing box, and a liquid leakage interface is processed on the liquid receiving pan.

[0009] Compared with the prior art, the packing seal decompression structure for conveying high-pressure medium of the utility model has the following features:

[0010] Beneficial effects:

[0011] 1. Reduce the medium pressure at the packing sealing medium end, and realize the conversion of the sealing medium from high-pressure medium to low-pressure medium;

[0012] 2. Reduce the packing pressing force, slow down the wear of packing and sleeve, increase the service life of packing and sleeve, and extend the maintenance cycle;

[0013] 3. Improved the friction efficiency of the unit;

[0014] 4. Provides a solution for changing the high-pressure medium seal from a mechanical seal to a packing seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the original sealing structure of the sleeve;

[0017] Among them, 1. shaft sleeve, 2. stuffing box, 3. stuffing, 4. stuffing ring, 5. stuffing gland, 6. lubrication water interface, 7. liquid collecting tray, 8. leakage interface, 9. labyrinth sealing groove, 10. liquid accumulation groove, 11. pressure relief channel, 12. pressure relief water pipe. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present utility model will be described clearly and completely below.

[0019] like Figure 1 As shown, a packing seal decompression structure for conveying high-pressure medium includes a sleeve 1, a stuffing box 2 is installed on the outer side of the sleeve 1, and packing 3, packing ring 4 and packing gland 5 are installed between the low-pressure side and the sleeve 1 of the stuffing box 2, the packing ring 4 is between the packing 3, and the packing gland 5 is tightened with the stuffing box 2 by screws around to compress the packing 3 and the packing ring 4, the stuffing box 2 is processed with a lubricating water interface 6, the lubricating water interface 6 is connected with the packing ring 4, the packing ring 4 is processed with an annular water groove, the lubricating water introduced by the lubricating water interface 6 enters the annular water groove, the packing ring 4 is evenly distributed with water outlet holes connected with the annular water groove, and the lubricating water in the annular water groove lubricates the surface of the sleeve 1 through the water outlet holes.

[0020] A liquid receiving pan 7 is arranged below the stuffing box 2 , and a liquid leakage interface 8 is processed on the liquid receiving pan 7 . The discharged lubricating water gathers in the liquid receiving pan 7 and is discharged from the liquid leakage interface 8 .

[0021] The stuffing box 2 is processed with a labyrinth sealing groove 9 and a liquid accumulation groove 10 in sequence on the high-pressure side. A pressure relief channel 11 is processed on the stuffing box 2. The pressure relief channel 11 is connected with the liquid accumulation groove 10. A pressure relief water pipe 12 is installed above the pressure relief channel 11. After the medium on the high-pressure side is depressurized by the labyrinth sealing groove 9, it enters the pressure relief water pipe 12 through the liquid accumulation groove 10 and is then discharged.

[0022] In this embodiment, the labyrinth sealing groove 9 is composed of multiple 5x5mm annular grooves with a distance of 5mm between the annular grooves. After the medium is depressurized by multiple annular grooves, it flows back to the water inlet fore pool or pump station liquid accumulation pool in the low-pressure area, thereby achieving pressure relief of the high-pressure medium at the packing medium end.

[0023] The present invention is not limited to the described embodiments. Those skilled in the art may make some modifications or changes without departing from the spirit and scope of the present invention, that is, within the scope of disclosure. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A packing seal decompression structure for conveying high-pressure media, comprising a shaft sleeve, a stuffing box is installed on the outside of the shaft sleeve, a packing, a packing ring and a packing gland are installed between the low-pressure side and the shaft sleeve of the stuffing box, and the packing gland presses the packing and the packing ring, characterized in that: The stuffing box is processed with a labyrinth sealing groove and a liquid accumulation groove in sequence on the high-pressure side, and a pressure relief channel is processed on the stuffing box. The pressure relief channel is connected with the liquid accumulation groove, and a pressure relief water pipe is installed above the pressure relief channel.

2. A packing seal decompression structure for conveying high-pressure medium according to claim 1, characterized in that: The labyrinth sealing groove is composed of a plurality of 5x5mm annular grooves, and the distance between the annular grooves is 5mm.

3. A packing seal decompression structure for conveying high-pressure medium according to claim 1, characterized in that: The packing ring is located between the packings, and a lubricating water interface is processed on the stuffing box, and the lubricating water interface is communicated with the packing ring.

4. A packing seal decompression structure for conveying high-pressure medium according to claim 1, characterized in that: A liquid receiving pan is arranged below the stuffing box, and a liquid leakage interface is processed on the liquid receiving pan.

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