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CN-224214426-U - Sealing structure and compressor with same

CN224214426UCN 224214426 UCN224214426 UCN 224214426UCN-224214426-U

Abstract

The utility model provides a sealing structure and a compressor with the same, wherein the sealing structure comprises a rotor and a static piece sleeved on the radial outer side of the rotor, a sealing unit is formed between the rotor and the static piece, the sealing unit comprises a wedge-shaped dynamic pressure sealing part and a fluid diffusion sealing part, the flow area of an inlet of a wedge-shaped flow channel arranged on the wedge-shaped dynamic pressure sealing part is larger than that of an outlet of the wedge-shaped flow channel, an inlet of a diffusion ring cavity arranged on the fluid diffusion sealing part is communicated with the outlet of the wedge-shaped flow channel, the outlet of the diffusion ring cavity and the inlet are arranged in a staggered mode on the axial projection of the rotor, the inlet of the wedge-shaped flow channel is communicated with a high-pressure area, and the outlet of the diffusion ring cavity is communicated with a low-pressure area. The utility model avoids the hard contact abrasion of the rotor and the static piece, prolongs the service life of the sealing structure, and further weakens the energy of the pressure fluid by the turbulent flow effect generated by the fluid diffusion sealing part so as to achieve the purpose of preventing gas leakage.

Inventors

  • Shao Chuanfu
  • CHEN YUHUI
  • YANG YUMING
  • ZHOU YU

Assignees

  • 珠海格力电器股份有限公司

Dates

Publication Date
20260508
Application Date
20250516

Claims (10)

  1. 1. The utility model provides a seal structure, includes rotor (1) and suit in static piece (2) of the radial outside of rotor (1), its characterized in that, rotor (1) with form sealing unit (300) between static piece (2), sealing unit (300) include wedge dynamic pressure sealing portion and fluid diffusion sealing portion, the flow area of the entry that wedge dynamic pressure sealing portion had wedge runner (31) is greater than the flow area of the export of wedge runner (31), the entry that fluid diffusion sealing portion had diffusion ring chamber (32) with the export intercommunication of wedge runner (31), just the export and the entry of diffusion ring chamber (32) are in dislocation arrangement on the axial projection of rotor (1), the entry and the high-pressure region intercommunication of wedge runner (31), the export and the low-pressure region intercommunication of diffusion ring chamber (32).
  2. 2. The sealing structure according to claim 1, wherein the sealing unit (300) further comprises a rectifying circuit (33) communicating between the outlet of the wedge-shaped flow channel (31) and the inlet of the diffusing annular chamber (32), the rectifying circuit (33) being adapted to introduce the fluid flowing out of the outlet of the wedge-shaped flow channel (31) into the diffusing annular chamber (32) in a direction tangential to the inlet of the diffusing annular chamber (32).
  3. 3. The sealing structure according to claim 2, characterized in that the wedge-shaped flow channel (31) is formed by a first cylindrical surface (11) on the outer wall surface of the rotor (1) and a first conical surface (21) on the inner wall surface of the stationary part (2), projected on any axial section of the rotor (1), the inclination angle of the first conical surface (21) being 2 ° -5 °.
  4. 4. A sealing arrangement according to claim 3, characterized in that the flow straightening ring (33) is formed by a second conical surface (12) on the outer wall surface of the rotor (1) and a third conical surface (22) on the inner wall surface of the stationary part (2), the inclination angles of the second conical surface (12) and the third conical surface (22) being equal, and the second conical surface (12) being closer to the rotor (1) in a direction away from the wedge-shaped flow channel (31).
  5. 5. The sealing structure according to claim 4, characterized in that the second conical surface (12) is inclined at an angle of 10 ° -20 ° projected on any axial section of the rotor (1), and/or the flow area of the rectifying ring (33) is equal to the flow area of the outlet of the wedge-shaped flow channel (31).
  6. 6. The sealing structure according to claim 4, characterized in that the diffusion ring chamber (32) comprises an arc surface (13) formed on the outer wall surface of the rotor (1), the arc surface (13) is tangentially connected with the second conical surface (12), the center of the arc surface (13) is at a side far away from the rotor (1), and the center angle of the arc surface (13) is 90 ° -180 °.
  7. 7. The sealing structure according to any one of claims 1 to 6, characterized in that between the rotor (1) and the stationary member (2) there are a plurality of sets of the sealing units (300), each set of the sealing units (300) being disposed in sequence along the axial direction of the rotor (1), and the outlet of a diffusion ring chamber (32) provided in one of the adjacent two sealing units (300) being connected with the inlet of the other wedge-shaped flow passage (31).
  8. 8. The sealing structure according to claim 1, characterized in that the inlet-to-outlet gap ratio of the wedge-shaped flow channel (31) is 1.2:1-1.5:1, and/or that the outlet of the diffusion ring chamber (32) is radially outside its inlet.
  9. 9. A compressor comprising the sealing structure of any one of claims 1 to 8.
  10. 10. Compressor according to claim 9, characterized in that the stationary part (2) is a compressor housing and the rotor (1) is a rotating shaft or an impeller.

Description

Sealing structure and compressor with same Technical Field The utility model belongs to the technical field of air conditioning, and particularly relates to a sealing structure and a compressor with the sealing structure. Background Comb seals are typically non-contact seal structures, which operate on the principle that a series of comb-like raised structures are provided between a rotating member and a stationary member to form a fluid damping effect, thereby effectively suppressing leakage of gas or liquid. In centrifugal compressors, comb seals are commonly used at impeller outlets or inter-stage sealing locations, primarily to prevent leakage of compressed gas from the high pressure region to the low pressure region. When the compressor is operated, high-pressure gas tries to leak through gaps between the comb teeth, but the gas flow passage is divided into a plurality of narrow passages due to the comb tooth structure. When gas flows in these narrow channels, the combined action of hydrodynamic effect and frictional resistance results in increased pressure drop, thus significantly reducing leakage. While the conventional comb seal structure exerts its advantages, there are some remarkable limitations, for example, the conventional comb seal seals based on the labyrinth effect of the fixed gap, but during the operation of the high-speed centrifuge, thermal expansion or vibration of the rotor may cause the gap to change, thereby causing leakage or hard contact wear problems. In addition, the dynamic pressure effect of a single wedge-shaped structure at a low speed or a start-stop stage is insufficient, static sealing performance is poor, sudden leakage is easy to cause, meanwhile, the risk of hard contact between tooth tops and a rotor is high, a gap is enlarged after long-term operation, and finally sealing failure is caused. Disclosure of utility model Therefore, the utility model provides the sealing structure and the compressor with the sealing structure, which can overcome the technical problems that in the prior art, the sealing structure adopts a single labyrinth comb to seal in the running process of a high-speed centrifugal machine, the clearance is possibly changed due to thermal expansion or vibration of a rotor, leakage or hard contact abrasion is easily caused, and the dynamic pressure effect is insufficient at the low-speed or start-stop stage, the static sealing performance is poor, and sudden leakage is easily caused due to the adoption of the single wedge-shaped structure. In order to solve the problems, the utility model provides a sealing structure, which comprises a rotor and a static piece sleeved on the radial outer side of the rotor, wherein a sealing unit is formed between the rotor and the static piece, the sealing unit comprises a wedge-shaped dynamic pressure sealing part and a fluid diffusion sealing part, the flow area of an inlet of a wedge-shaped runner provided with the wedge-shaped dynamic pressure sealing part is larger than that of an outlet of the wedge-shaped runner, an inlet of a diffusion ring cavity provided with the fluid diffusion sealing part is communicated with the outlet of the wedge-shaped runner, the outlet of the diffusion ring cavity and the inlet are arranged in a staggered mode on the axial projection of the rotor, the inlet of the wedge-shaped runner is communicated with a high-pressure area, and the outlet of the diffusion ring cavity is communicated with a low-pressure area. In some embodiments, the sealing unit further comprises a flow straightening loop communicating between the outlet of the dovetail flow channel and the inlet of the diffuser ring cavity, the flow straightening loop being for introducing fluid exiting the outlet of the dovetail flow channel into the diffuser ring cavity in a direction tangential to the inlet of the diffuser ring cavity. In some embodiments, the wedge-shaped flow channel is formed by a first cylindrical surface on the outer wall surface of the rotor and a first conical surface on the inner wall surface of the static piece, and the first conical surface is projected on any axial section of the rotor, and the inclination angle of the first conical surface is 2-5 degrees. In some embodiments, the rectifying ring is formed by a second conical surface on an outer wall surface of the rotor and a third conical surface on an inner wall surface of the stationary member, the second conical surface and the third conical surface are equal in inclination angle, and the second conical surface is closer to the rotor in a direction away from the wedge-shaped flow passage. In some embodiments, the second conical surface is projected on any axial section of the rotor, and the inclination angle of the second conical surface is 10-20 degrees, and/or the flow area of the rectifying ring is equal to the flow area of the outlet of the wedge-shaped flow channel. In some embodiments, the diffusion ring cavity comprises an arc surface form