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CN-122016319-A - Stepped tooth brush type combined sealing device with inclined circular arc groove

CN122016319ACN 122016319 ACN122016319 ACN 122016319ACN-122016319-A

Abstract

The invention provides a stepped tooth brush type combined sealing device with inclined circular arc grooves, which comprises a runway, sealing teeth, a plurality of cavities and a plurality of sealing units, wherein the runway is in a revolving body structure, the outer wall of the runway is provided with a plurality of step structures, the distance between the upper end surface of each step structure and the revolving axis of the runway is increased in a stepped mode along the gas flowing direction, the sealing teeth are sleeved on the outer side of the runway, the cavities are arranged on the inner side of each sealing tooth, and the cavities are in one-to-one correspondence with the step structures and form the sealing units with the same structure. The processing difficulty is effectively reduced by simplifying the shape of the sealing teeth, meanwhile, the number of leakage points is reduced by utilizing the layout of the stepped sealing teeth, and the assembly flow is optimized, so that the sealing device is more flexible to use. The design of the ratio of the depth of the wide sealing teeth to the depth of the small grooves greatly improves the pneumatic elastic stability of the sealing teeth, and ensures the structural safety. The inclined circular arc groove design optimizes the airflow flow path, strengthens the dissipation effect and obviously improves the sealing effect of the stepped teeth.

Inventors

  • WANG XIN
  • WANG HUAITAO
  • CHEN MINGQIAN
  • LI PENGBIN
  • LIU TINGWU
  • YE BENYUAN

Assignees

  • 中国航发四川燃气涡轮研究院

Dates

Publication Date
20260512
Application Date
20260109

Claims (8)

  1. 1. The utility model provides a take ladder tooth brush formula combination sealing device of slope circular arc groove which characterized in that includes: The runway (6) is in a revolving body structure, a plurality of step structures are arranged on the outer wall of the runway (6), and the distance between the upper end surface of each step structure and the revolving axis of the runway (6) is increased in a step manner along the gas flowing direction; the sealing teeth (5) are sleeved on the outer side of the runway (6), a plurality of cavities are formed in the inner side of the sealing teeth (5), and the cavities and the step structures are arranged in one-to-one correspondence and form a plurality of sealing units with the same structure.
  2. 2. The stepped tooth brush combination seal with inclined circular arc groove according to claim 1, wherein said seal unit comprises: an air inlet channel (11) communicated with the air inlet end; One end of the arc-shaped cavity (12) is connected with the outlet end of the air inlet channel (11), and the position of the other end of the arc-shaped cavity (12) in the horizontal direction is higher than one end of the arc-shaped cavity (12); The trapezoid cavity (13) is communicated with the air inlet channel (11) and the arc cavity (12), and the trapezoid cavity (13) is located above the arc cavity (12).
  3. 3. The stepped tooth brush type combined sealing device with inclined circular arc grooves according to claim 2, wherein the trapezoidal cavity (13) of the front sealing unit is connected with the air inlet channel (11) of the rear sealing unit.
  4. 4. The stepped tooth brush combined sealing arrangement with inclined circular arc grooves according to claim 2, wherein the length of the air inlet channel (11) is L1 and the length of the sealing unit is L2 in the axial direction, wherein 2 x L1 is equal to or less than L2 is equal to or less than 3 x L1.
  5. 5. The stepped tooth brush type combined sealing device with the inclined circular arc groove according to claim 2, wherein the trapezoid cavity (13) is an isosceles trapezoid cavity, and an included angle between the side edge of the trapezoid cavity (13) and the vertical direction is alpha, wherein alpha is more than or equal to 5 degrees and less than or equal to 10 degrees.
  6. 6. The stepped tooth brush type combined sealing device with the inclined circular arc groove according to claim 5, wherein the other end of the arc-shaped cavity (12) is inclined towards the air inlet channel (11), and an included angle between a tangent line of the other end of the arc-shaped cavity (12) and a rotation axis of the runway (6) is beta, wherein alpha+beta=90°.
  7. 7. The stepped tooth brush type combined sealing device with inclined circular arc grooves according to claim 6, wherein the height difference between the bottom surface of the trapezoid cavity (13) of the rear sealing unit and the bottom surface of the trapezoid cavity (13) of the front sealing unit is δ, and the height of the air intake passage (11) is a, wherein δ is equal to or greater than 2a.
  8. 8. The stepped tooth brush combination seal with inclined circular arc groove according to claim 7, wherein the distance between the end point of the other end of the arc-shaped cavity (12) and the center of the arc-shaped cavity (12) is L3, wherein l3=δ.

Description

Stepped tooth brush type combined sealing device with inclined circular arc groove Technical Field The invention relates to the technical field of aeroengine testing, in particular to a stepped tooth brush type combined sealing device with an inclined circular arc groove. Background In certain aeroengine testing operations, the form of a seal cavity is typically employed to provide a high pressure seal environment for the engine bearing cavity seal. In general, the seal chamber has a plurality of seal positions, which are limited in terms of the structural size, axial spacing, seal line speed, assembly interference, etc. of the test piece, and a contact type mechanical seal device cannot be used. The non-contact type sealing mode mainly comprises the sealing of the comb teeth, but the traditional sealing of the comb teeth has the problems of higher leakage quantity, high requirements on the processing technology of the sealing teeth, possible pneumatic elastic instability and the like, and restricts the further improvement of the sealing performance of the comb teeth. The staggered comb tooth structure can be installed only by dividing the sealing tooth into a plurality of sector sections, so that unnecessary leakage points are introduced to reduce the sealing performance, and the problems of complex structure, high processing precision requirement, complex assembly and the like are caused. Disclosure of Invention In view of the above, the invention provides a stepped tooth brush type combined sealing device with inclined circular arc grooves, which solves the problems of large leakage amount, complex processing technology and high risk of pneumatic elastic instability of the traditional comb tooth seal. The invention provides a stepped tooth brush type combined sealing device with inclined circular arc grooves, which comprises a runway, sealing teeth and a plurality of sealing units, wherein the runway is in a revolving body structure, the outer wall of the runway is provided with a plurality of stepped structures, the distance between the upper end surface of each stepped structure and the revolving axis of the runway is increased in a stepped mode along the flowing direction of gas, the sealing teeth are sleeved on the outer side of the runway, the inner side of each sealing tooth is provided with a plurality of cavities, and the cavities and the stepped structures are in one-to-one correspondence to form the sealing units with the same structure. Compared with the prior art, the wide stepped tooth-brush type combined sealing device with the inclined circular arc grooves has the advantages that the processing difficulty is effectively reduced by simplifying the shape of the sealing teeth, meanwhile, the stepped sealing tooth layout is utilized, the number of leakage points is reduced, the assembly process is optimized, and the sealing device is more flexible to use. The design of the ratio of the depth of the wide sealing teeth to the depth of the small grooves greatly improves the pneumatic elastic stability of the sealing teeth, and ensures the structural safety. The inclined circular arc groove design optimizes the airflow flow path, strengthens the dissipation effect and obviously improves the sealing effect of the stepped teeth. Compared with the conventional comb tooth structure, the leakage amount can be reduced by about 20 percent. The wide step tooth-brush type combined sealing structure with the inclined circular arc grooves is formed by being used together with single-stage brush type sealing, sealing pressure difference is further optimized, and the pressure difference between the step tooth and the brush type sealing is reduced by about 50% within the range of 28 kPa-500 kPa sealing pressure difference, so that leakage is further controlled. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention; FIG. 2 is an enlarged schematic cross-sectional view of a wide stepped tooth with an angled arcuate slot provided in an embodiment of the present invention; FIG. 3 is a schematic cross-sectional view of a seal tooth structure in a combined seal device according to an embodiment of the present invention; fig. 4 is a schematic cross-sectional view of a stepped tooth structure of an inclined arc groove on a runway in a combined sealing device according to an embodiment of the present invention. In the figure, reference numerals are 1, an outer ring, 11, an air inlet channel, 12, an arc-shaped cavity, 13, a trapezoid cavity, 2, an elastic retainer r