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CN-121993604-A - Self-lubricating mechanical sealing device

CN121993604ACN 121993604 ACN121993604 ACN 121993604ACN-121993604-A

Abstract

The invention provides a self-lubricating mechanical sealing device, which belongs to the field of rotary sealing equipment and comprises a positioning mechanism, a static sealing ring, a dynamic sealing ring and a rotary connector which are sequentially arranged, wherein a first channel is arranged on the positioning mechanism, a second channel is arranged on the rotary connector, the first channel, an inner ring of the static sealing ring, an inner ring of the dynamic sealing ring and the second channel form a medium flow channel, the contact surface of the static sealing ring and the dynamic sealing ring is a sealing surface, a lubricating cavity is formed between the surfaces of the static sealing ring and the dynamic sealing ring, which are opposite and are not contacted, the lubricating cavity is communicated with the sealing surface, a necking channel is arranged at one side of the lubricating cavity, close to the medium flow channel, the lubricating cavity is filled with lubricating grease, medium is extruded into the sealing surface through the medium flow channel to realize lubrication, and meanwhile, a necking channel is arranged at one side of the lubricating cavity, close to the medium flow channel, and slag slurry and the like are collected through the necking channel to contain solid particles or fibrous impurities, so as to prevent abrasion of the sealing surface.

Inventors

  • GAO QIAOJUAN
  • LU PENG
  • GAO YE
  • LI BO
  • LI XIANYI
  • MI KAIFU
  • WANG BO
  • WANG FANGMING
  • LIU QING
  • ZHANG HONGJUN
  • LEI YU
  • ZHANG YONG

Assignees

  • 中国石油天然气集团有限公司
  • 北京石油机械有限公司
  • 中国石油集团昆仑制造有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (14)

  1. 1. The self-lubricating mechanical sealing device is characterized by comprising a positioning mechanism (10), a static sealing ring (5), a dynamic sealing ring (8) and a rotary connector (9) which are sequentially arranged; the positioning mechanism (10) is provided with a first channel, the rotary connector (9) is provided with a second channel, and the first channel, the inner ring of the static sealing ring (5), the inner ring of the movable sealing ring (8) and the second channel form a medium flow channel (110); The contact surface of the static sealing ring (5) and the movable sealing ring (8) is a sealing surface (120), a lubrication cavity (140) is formed between the surfaces of the static sealing ring (5) and the movable sealing ring (8) which are opposite and are not in contact, the lubrication cavity (140) is communicated with the sealing surface (120), and a necking channel (150) is arranged on one side, close to the medium flow channel (110), of the lubrication cavity (140).
  2. 2. The self-lubricating mechanical sealing device according to claim 1, wherein a first groove (502) is formed on the side, opposite to the movable sealing ring (8), of the static sealing ring (5), and the first groove (502) is close to the inner ring of the static sealing ring (5), and a first wear-resistant layer (501) is arranged in the first groove (502); a second groove (802) is formed in one side, opposite to the static sealing ring (5), of the movable sealing ring (8), and the second groove (802) is close to the inner ring of the movable sealing ring (8), and a second wear-resistant layer (801) is arranged in the second groove (802); The second wear-resistant layer (801) is buckled with the first wear-resistant layer (501) and an L-shaped lubrication cavity (140) is formed between the first wear-resistant layer (501) and the second wear-resistant layer (801), and the contact surface of the second wear-resistant layer (801) and the first wear-resistant layer (501) is a sealing surface (120).
  3. 3. A self-lubricating mechanical seal device according to claim 2, wherein, The first wear-resistant layer (501) comprises a first annular body (5011) and a second annular body (5012), the first annular body (5011) is arranged in the first groove (502), the second annular body (5012) protrudes out of the annular end face of the static seal ring (5) and is arranged on the first annular body (5011), and the second annular body (5012) is aligned with one side, close to the medium flow channel (110), of the first annular body (5011); The second wear-resistant layer (801) comprises a third annular body (8011) and a fourth annular body (8012), the third annular body (8011) is arranged in the second groove (802), the fourth annular body (8012) protrudes out of the annular end face of the movable sealing ring (8) and is arranged on the third annular body (8011), and the fourth annular body (8012) is aligned with one side, far away from the medium flow channel (110), of the third annular body (8011); The first annular body (5011) is contacted with the opposite surface of the fourth annular body (8012), and the contact surface is a sealing surface (120); A first gap is reserved on the opposite surface of the second annular body (5012) and the fourth annular body (8012), a second gap is reserved on the opposite surface of the second annular body (5012) and the third annular body (8011), the first gap is communicated with the second gap, a necking channel (150) is arranged at one end, close to the medium flow channel (110), of the second gap, and a lubricating cavity (140) is formed by the first gap and the second gap.
  4. 4. The self-lubricating mechanical sealing device according to claim 1, wherein the positioning mechanism (10) comprises a fixed sleeve (1), an adjusting component (2), a sealing component (3) and a pressing sleeve (4), wherein a second inner hole (401) is formed in the pressing sleeve (4); The fixing sleeve (1) is slidably arranged in a second inner hole (401) of the pressing sleeve (4), a third groove (402) is formed in the outer wall of the second inner hole (401) by expansion, a shoulder (403) is formed in the outer wall of the second inner hole (401) by contraction, the shoulder (403) is flush with one end, close to the static sealing ring (5), of the pressing sleeve (4), the bottom wall of the fixing sleeve (1) is slidably arranged between the bottom wall of the third groove (402) and the shoulder (403), a sealing assembly (3) is arranged in the third groove (402), and the sealing assembly (3) is in sealing connection with the outer side wall (103) of the fixing sleeve (1); the adjusting component (2) is arranged between the fixing sleeve (1) and the pressing sleeve (4).
  5. 5. The self-lubricating mechanical sealing device according to claim 4, characterized in that a first inner hole (101) is formed in the fixing sleeve (1), an outer side wall (103) is arranged on the outer side of the fixing sleeve (1), the outer side wall (103) is slidably mounted in the second inner hole (401), the outer side wall (103) is in inner ring contact with the sealing assembly (3), and a first connecting disc (102) is arranged at one end, far away from the pressing sleeve (4), of the outer side wall (103).
  6. 6. A self-lubricating mechanical seal according to claim 5, characterized in that a second connecting disc (404) is arranged outside the compression sleeve (4), said second connecting disc (404) being located at the end of the compression sleeve (4) close to the shoulder (403).
  7. 7. A self-lubricating mechanical seal according to claim 4, characterized in that the adjustment assembly (2) comprises an elastic element (201) and a central rod (202); One end of the center rod (202) is fixedly connected with the first connecting disc (102) of the fixed sleeve (1), the other end of the center rod (202) is slidably arranged in a round hole of the second connecting disc (404) of the pressing sleeve (4), the elastic element (201) is sleeved on the center rod (202), and two ends of the elastic element (201) are respectively contacted with the first connecting disc (102) and the second connecting disc (404).
  8. 8. A self-lubricating mechanical seal device according to claim 4, characterized in that an anti-vibration seal (130) is arranged between the compression sleeve (4) and the static seal ring (5).
  9. 9. The self-lubricating mechanical sealing device according to claim 8, wherein the outer wall of the static sealing ring (5) is provided with a first positioning groove (503), the end face of the compression sleeve (4) opposite to the static sealing ring (5) is provided with a third positioning groove, and the first positioning block (6) is installed in the first positioning groove (503) and the third positioning groove.
  10. 10. A self-lubricating mechanical seal device according to claim 1, characterized in that an anti-vibration seal (130) is arranged between the moving seal ring (8) and the rotating connection body (9).
  11. 11. The self-lubricating mechanical sealing device according to claim 10, wherein the outer wall of the movable sealing ring (8) is provided with a second positioning groove (803), the end face of the rotary connector (9) opposite to the movable sealing ring (8) is provided with a fourth positioning groove, and the second positioning block (7) is mounted in the second positioning groove (803) and the fourth positioning groove.
  12. 12. A self-lubricating mechanical seal according to any of claims 1-11, characterized in that the inner ring diameters of the stationary seal ring (5) and the moving seal ring (8) are the same.
  13. 13. A self-lubricating mechanical sealing method is characterized in that, The contact surface of the static sealing ring (5) and the movable sealing ring (8) is a sealing surface (120), a lubrication cavity (140) is formed between the surface of the static sealing ring (5) opposite to the surface of the movable sealing ring (8) which is not contacted, and lubricating grease is filled in the lubrication cavity (140); the positioning mechanism (10) applies pressure to the static sealing ring (5) to enable the static sealing ring (5) to be in contact with the movable sealing ring (8) so as to form a seal; The necking channel (150) receives medium pressure in the medium flow channel (110) so as to continuously enable lubricating grease in the lubricating cavity (140) to enter the sealing surface (120) to keep lubricating, and meanwhile, the necking channel (150) filters a medium containing solid particles or fibrous impurities.
  14. 14. A self-lubricating mechanical sealing method as claimed in claim 13, wherein, The medium flow channel (110) pushes the shoulder (403) to carry out secondary pressurization so that the static sealing ring (5) and the movable sealing ring (8) keep in contact to form a seal.

Description

Self-lubricating mechanical sealing device Technical Field The invention belongs to the field of rotary sealing equipment, and particularly relates to a self-lubricating mechanical sealing device. Background The mechanical sealing technology is gradually replacing the traditional packing sealing technology, the mechanical seal is used as a key core component of a dynamic and static load joint, the demand is continuously increased, the power loss of the mechanical seal is 10% -50% of that of the packing seal, and the mechanical seal has the advantages of simple structure, convenience in assembly and disassembly, high efficiency and the like. Currently, the demand for high-pressure high-rotation-speed pipeline sealing products in oilfield sites is continuously increasing. The sealing surface of the common mechanical seal adopts a slotting sealing technology, and has large abrasion loss of the sealing surface aiming at working conditions of large drift diameter, high pressure and high rotation speed, so that a satisfactory use effect is difficult to obtain. Conventional mechanical seals are very prone to abrasion of sealing surfaces against solid particle or fibrous impurity-containing media such as slurry, and have large leakage and short service lives. There is therefore an urgent need for a sealing mechanism that reduces seal wear and protects the sealing surfaces. Disclosure of Invention The invention provides a self-lubricating mechanical sealing device which comprises a positioning mechanism, a static sealing ring, a dynamic sealing ring and a rotary connector which are sequentially arranged; the positioning mechanism is provided with a first channel, the rotary connector is provided with a second channel, and the first channel, the inner ring of the static sealing ring, the inner ring of the movable sealing ring and the second channel form a medium flow channel; The contact surface of the static sealing ring and the movable sealing ring is a sealing surface, a lubrication cavity is formed between the surfaces of the static sealing ring and the movable sealing ring which are opposite and are not in contact, the lubrication cavity is communicated with the sealing surface, and a necking channel is arranged on one side of the lubrication cavity, which is close to the medium flow passage. Further, a first groove is formed in one side, opposite to the movable sealing ring, of the static sealing ring, and the first groove is close to the inner ring of the static sealing ring; A second groove is formed in one side, opposite to the static sealing ring, of the movable sealing ring, and the second groove is close to the inner ring of the movable sealing ring; The second wear-resisting layer is buckled with the first wear-resisting layer, an L-shaped lubrication cavity is formed between the first wear-resisting layer and the second wear-resisting layer, and the contact surface of the second wear-resisting layer and the first wear-resisting layer is a sealing surface. Further, the first wear-resistant layer comprises a first annular body and a second annular body, the first annular body is arranged in the first groove, the second annular body protrudes out of the annular end face of the static sealing ring and is arranged on the first annular body, and the second annular body is aligned with one side, close to the medium flow passage, of the first annular body; The second wear-resistant layer comprises a third annular body and a fourth annular body, the third annular body is arranged in the second groove, the annular end face of the fourth annular body protruding out of the movable sealing ring is arranged on the third annular body, and the fourth annular body is aligned with one side, far away from the medium flow passage, of the third annular body; the first annular body is contacted with the opposite surface of the fourth annular body, and the contact surface is a sealing surface; the first gap is reserved on the opposite surface of the second annular body to the fourth annular body, the second gap is reserved on the opposite surface of the second annular body to the third annular body, the first gap is communicated with the second gap, a necking channel is arranged at one end, close to the medium flow channel, of the second gap, and the first gap and the second gap form a lubricating cavity. Further, the positioning mechanism comprises a fixed sleeve, an adjusting assembly, a sealing assembly and a pressing sleeve, wherein the pressing sleeve is provided with a second inner hole; The fixed sleeve is slidably arranged in the second inner hole of the compression sleeve, a third groove is formed in the outer wall of the second inner hole in an outward expanding mode, a shoulder is formed in the outer wall of the second inner hole in an inward shrinking mode, and the shoulder is flush with one end, close to the static sealing ring, of the compression sleeve; The adjusting component is arranged between the fixed slee