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CN-122014666-A - Pump body sealing structure and sealing method thereof

CN122014666ACN 122014666 ACN122014666 ACN 122014666ACN-122014666-A

Abstract

The application relates to the technical field of submarine pump body sealing, and discloses a pump body sealing structure and a sealing method thereof, wherein the sealing structure is assembled in a pump body, a bearing bin is arranged in the pump body, a transmission shaft is arranged in the bearing bin, the sealing structure is arranged on the transmission shaft and comprises a dynamic and static ring sealing structure and a cabin sealing assembly which are sequentially arranged from a medium end to a transmission end, the dynamic and static ring sealing structure comprises a rigid movable ring and a flexible static ring which are matched to form a labyrinth sand prevention cavity, and the rigid movable ring circumferentially rotates relative to the flexible static ring to enable the labyrinth sand prevention cavity to have a grinding function. The grinding sealing surface is formed by the relative movement of the rigid movable ring and the flexible stationary ring of the dynamic and static ring structure, so that the grinding effect can grind and crush fine silt attached to the sealing surface while the foundation is sealed, the abrasion of the silt to the sealing surface is reduced, and the sealing durability of the sealing surface under the seabed high silt working condition is improved.

Inventors

  • ZHAO SIXIN
  • LI SHENGPING
  • MAO YAOMIN

Assignees

  • 江苏天辰海洋工程技术股份有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (10)

  1. 1. A pump body sealing structure is assembled in a pump body; the pump body is provided with a bearing bin, and a transmission shaft is arranged in the bearing bin, and is characterized in that the sealing structure is arranged on the transmission shaft and comprises a dynamic and static ring sealing structure and a cabin sealing assembly which are sequentially arranged from a medium end to a transmission end; the dynamic and static ring sealing structure comprises a rigid dynamic ring and a flexible static ring which are matched to form a labyrinth sand prevention cavity; The rigid movable ring circumferentially rotates relative to the flexible stationary ring, so that the labyrinth sand prevention cavity has a grinding function.
  2. 2. The pump body sealing structure according to claim 1, wherein the rigid moving ring is assembled on one side of a medium end, and the flexible stationary ring is installed on one side of a driving end.
  3. 3. The pump body seal arrangement of claim 1, wherein the rigid ring comprises: the movable ring positioning end is fixed on the transmission shaft; The movable ring body is connected with the movable ring positioning end in the radial direction; the movable ring adaptation end is arranged on one side, facing the medium end, of the movable ring body, and the movable ring positioning end, the movable ring body and the movable ring adaptation end are enclosed to form a movable ring adaptation cavity.
  4. 4. A pump body seal according to claim 3, wherein the flexible stationary ring comprises: the static ring positioning end is fixed at one side of the cabin sealing assembly, which is close to the medium end; the stationary ring body is connected with the stationary ring positioning end in the radial direction; the static ring adapting end is arranged on one side of the moving ring body, which faces the medium end, and is adapted to the moving ring adapting end.
  5. 5. The pump body seal arrangement of claim 1, wherein the chamber seal assembly comprises: The sealing gland is fixedly connected with the transmission connecting structure and is simultaneously connected with the flexible stationary ring; the rubber sealing piece is arranged between the transmission connecting structure and the transmission shaft; and the O-shaped ring is embedded in a gap between the sealing gland and the transmission connecting structure.
  6. 6. The pump body sealing structure according to claim 1, wherein the transmission shaft is connected to the output end of the motor through a transmission connection structure, the transmission connection structure comprises a bearing bin and deep groove ball bearings, at least two deep groove ball bearings are arranged, the deep groove ball bearings are embedded in the bearing bin, and the transmission shaft penetrates through the deep groove ball bearings.
  7. 7. The pump body sealing structure according to claim 1, wherein the end face of the rigid moving ring, which is close to the medium end, is provided with a predetermined bevel angle to form a sand throwing structure.
  8. 8. The pump body sealing structure of claim 1, wherein the flexible stationary ring is a replaceable component, the flexible stationary ring is nylon, and the rigid movable ring is stainless steel.
  9. 9. The sealing method of a pump body sealing structure according to any one of claims 1 to 8, which is suitable for a submarine sediment protection scene, and is characterized by comprising the following steps: The flexible stationary ring is in a relatively static state, and the flexible stationary ring are in relative motion to form a labyrinth sand prevention cavity in a matched mode; the labyrinth path of the labyrinth sand prevention cavity forms a basic sealing protection, and a grinding gap is formed between the adapting surfaces of the dynamic rigid dynamic ring and the flexible static ring to crush and grind sand grains entering the cavity; the cabin sealing assembly further blocks and intercepts broken and refined sand grains, and the blocked fine sand grains are thrown outwards under the scouring action of a flowing medium and the centrifugal force action of a dynamic rotating rigid ring, so that sand prevention sealing and medium self-cleaning are realized.
  10. 10. The sealing method of the pump body sealing structure according to claim 9, wherein the flexible static ring is made of nylon, and the flexible static ring can be replaced according to the abrasion degree of the seabed sediment working condition; And the sealing effect is monitored regularly, if the sealing effect is lower than a preset threshold value, the flexible static ring is stopped and replaced, and then the sealing structure is restarted to restore the sealing and grinding protection capability.

Description

Pump body sealing structure and sealing method thereof Technical Field The application relates to the technical field of submarine pump body sealing, in particular to a pump body sealing structure and a sealing method thereof. Background The pump body is used as a fluid conveying core device, is widely applied to the field of ocean engineering such as submarine exploration, ocean resource development and the like, and high-content sediment and corrosive seawater in a submarine environment easily invade a sealing part of the pump body to cause abrasion of a sealing element and failure of sealing performance, even cause clamping stagnation and corrosion damage of a transmission part in the pump body to seriously influence the working stability and the service life of the pump body, so that extremely high requirements are provided for sealing sand prevention and corrosion resistance of a sealing structure of the pump body. In the prior art, a sealing structure for a pump body has many researches and applications, wherein the labyrinth oil seal structure becomes a common structure for sealing a pump body bearing box due to the characteristics of no direct contact of dynamic and static parts, no need of a compression structure, low cost and relatively long service life. The utility model patent with the publication number of CN218625432U discloses a labyrinth oil seal structure for a pump body bearing box, which is characterized in that an inner moving ring and an outer moving ring are respectively arranged on two sides of a static ring along the axial direction of a transmission shaft, so that longer and more complex labyrinth structures are formed among the static ring, the inner moving ring, the outer moving ring and the transmission shaft, the sealing effect of preventing leakage of lubricating oil is improved, meanwhile, the outer moving ring is utilized to block the splashing of pumping liquid, the backflow of the lubricating oil and the discharge of pumping liquid are realized by matching with a backflow hole, the problem of short service life of the traditional labyrinth sealing structure is effectively solved, and the sealing cost of the pump body bearing box is reduced. But this labyrinth oil blanket structure's design initially is mainly to the lubricating oil leak protection of pump body bearing box and the invasion of preventing of conventional pumping liquid, and its labyrinth structure can only realize the passive physical separation of basis, does not have the initiative sand control design to seabed high concentration silt, can't deal with seabed silt and pile up, easily invade the problem in sealed core area, and does not set up the sealed face of grinding, is difficult to effectively handle slight silt, and silt is easily piled up and is caused wearing and tearing in labyrinth structure, seals sand control effect and is difficult to adapt to the special operating mode of seabed high silt. Disclosure of Invention The application provides a pump body sealing structure and a sealing method thereof, which aim to solve the problems of poor sand prevention effect and short sealing life of the pump body sealing structure under the seabed sediment working condition in the prior art. The application provides a pump body sealing structure and a sealing method thereof, which adopt the following technical scheme: The pump body is provided with a bearing bin, a transmission shaft is arranged in the bearing bin, the sealing structure is arranged on the transmission shaft and comprises a dynamic and static ring sealing structure and a cabin sealing assembly which are sequentially arranged from a medium end to a transmission end, the dynamic and static ring sealing structure comprises a rigid movable ring and a flexible static ring which are mutually matched to form a labyrinth sand prevention cavity, and the rigid movable ring circumferentially rotates relative to the flexible static ring to enable the labyrinth sand prevention cavity to have a grinding function. Further, the rigid moving ring is assembled on one side of the medium end, and the flexible static ring is arranged on one side of the transmission end. The rigid moving ring comprises a moving ring positioning end fixed on the transmission shaft, a moving ring body connected with the moving ring positioning end in the radial direction, a moving ring adapting end arranged on one side of the moving ring body facing the medium end, and a moving ring adapting cavity formed by encircling the moving ring positioning end, the moving ring body and the moving ring adapting end. The flexible static ring comprises a static ring positioning end fixed on one side, close to the medium end, of the cabin sealing assembly, a static ring body connected to the static ring positioning end in the radial direction, a static ring adapting end arranged on one side, facing the medium end, of the movable ring body, and the static ring adapting end is adapted to the movable