Search

CN-122014418-A - Oil discharge sealing structure of separating surface

CN122014418ACN 122014418 ACN122014418 ACN 122014418ACN-122014418-A

Abstract

The invention discloses a separation surface oil discharge sealing structure, which relates to the technical field of ramjet engines and comprises a fluid transmission mechanism, wherein the fluid transmission mechanism comprises a first oil discharge pipe and a second oil discharge pipe which are respectively arranged in a task load and an boosting structure, the output end of the first oil discharge pipe is in butt joint with the input end of the second oil discharge pipe and communicated with the input end of the second oil discharge pipe for conveying high-temperature cooling oil, a thermal expansion sealing mechanism is sleeved at the communication position of the first oil discharge pipe and the second oil discharge pipe, a limiting mechanism is sleeved on the outer wall of the thermal expansion sealing mechanism, and when the first oil discharge pipe discharges the high-temperature cooling oil to the second oil discharge pipe, the thermal expansion sealing mechanism thermally expands to seal the communication position of the first oil discharge pipe and the second oil discharge pipe, so that leakage of the high-temperature cooling oil is avoided.

Inventors

  • LU MENGNAN
  • XU LONGFEI
  • GAO YU

Assignees

  • 四川凌空天行科技有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (8)

  1. 1. A separation surface oil drain sealing structure, comprising: The fluid transmission mechanism comprises a first oil drain pipe (1) and a second oil drain pipe (2) which are respectively arranged in the task load and the boosting structure, wherein the output end of the first oil drain pipe (1) is in butt joint and communication with the input end of the second oil drain pipe (2) and is used for transmitting high-temperature cooling oil after heat exchange with an engine; the thermal expansion sealing mechanism is sleeved at the communication part of the first oil discharge pipe (1) and the second oil discharge pipe (2); the limiting mechanism is sleeved on the outer wall of the thermal expansion sealing mechanism and used for radially limiting the thermal expansion sealing mechanism; When the first oil drain pipe (1) discharges high-temperature cooling oil to the second oil drain pipe (2), the thermal expansion sealing mechanism is heated to expand, and the limiting mechanism is used for enabling the thermal expansion sealing mechanism to expand inwards to seal the communication position of the first oil drain pipe (1) and the second oil drain pipe (2).
  2. 2. The separating surface oil drain sealing structure according to claim 1, wherein the task load comprises a task load shell (3), the boosting structure comprises a boosting structure shell (4), the task load shell (3) is abutted against the boosting structure shell (4), and the abutting surface is a separating surface (7).
  3. 3. The oil discharge sealing structure of the separation surface according to claim 2 is characterized in that a first groove is formed in the end face, close to the boosting structure shell (4), of the task load shell (3), a first through hole communicated with the inside of the task load shell (3) is formed in the bottom of the first groove, the first oil discharge pipe (1) penetrates through the first through hole to extend into the first groove, a second groove is formed in the end face, close to the task load shell (3), of the boosting structure shell (4), a second through hole communicated with the inside of the boosting structure shell (4) is formed in the bottom of the second groove, the second oil discharge pipe (2) penetrates through the second through hole to extend into the second groove, and the first groove corresponds to the second groove.
  4. 4. The oil drainage sealing structure for the separation surface according to claim 3, wherein the thermal expansion sealing mechanism comprises a first thermal expansion bushing (5) and a second thermal expansion bushing (6), the first thermal expansion bushing (5) and the second thermal expansion bushing (6) are respectively arranged inside the first groove and the second groove, the first thermal expansion bushing (5) and the second thermal expansion bushing (6) are butted, and the butted surface of the first thermal expansion bushing (5) and the butted surface of the second thermal expansion bushing (6) are coplanar with the separation surface (7).
  5. 5. The oil discharge sealing structure of the separation surface according to claim 4, wherein the limiting mechanism comprises a first limiting bushing (8) and a second limiting bushing (9), the first limiting bushing (8) and the second limiting bushing (9) are respectively arranged in the first groove and the second groove, the first limiting bushing (8) is sleeved on the outer wall of the first thermal expansion bushing (5), the outer wall of the first limiting bushing (8) is fixedly connected with the inner wall of the first groove, the second limiting bushing (9) is sleeved on the outer wall of the second thermal expansion bushing (6), the outer wall of the second limiting bushing (9) is fixedly connected with the inner wall of the second groove, the first limiting bushing (8) is in butt joint with the second limiting bushing (9), and the butt joint surface of the first limiting bushing (8) is coplanar with the separation surface (7).
  6. 6. A parting plane oil extraction seal according to claim 2, characterized in that the task load housing (3) and the boost housing (4) are connected by means of an electrical parting member.
  7. 7. A parting plane oil drain sealing structure according to claim 2, characterized in that one end of the first oil drain pipe (1) communicating with the second oil drain pipe (2) is close to the task load housing (3) with respect to the parting plane (7).
  8. 8. The separating surface oil drain sealing structure according to claim 1, wherein the thermal expansion coefficient of the thermal expansion sealing mechanism is larger than the thermal expansion coefficients of the first oil drain pipe (1), the second oil drain pipe (2) and the limiting mechanism.

Description

Oil discharge sealing structure of separating surface Technical Field The invention relates to the technical field of ramjet engines, in particular to a separating surface oil discharge sealing structure. Background With the rapid development of hypersonic aircraft and ramjet technology, aircraft are facing serious thermal protection challenges during high speed flight. In order to meet the working demands of the engine combustion chamber and the engine body structure in a high-temperature environment, an oil cooling system is widely applied to hypersonic aircrafts as an active heat protection means. The system achieves efficient heat transfer and temperature control by circulating cooling oil between the engine and the airframe structure, thereby allowing the aircraft to fly at higher speeds and longer times with existing material temperature extremes. In the prior art, the cooling oil drain lines are typically arranged in segments, each between the mission load section and the boost section. The two sections of oil pipes are required to be connected and sealed at the separating surface through a reliable sealing structure so as to ensure that the cooling system works normally in the flying process. The sealing mode commonly adopted at present is a traditional conical surface compression sealing structure, namely, conical matching surfaces of two sections of oil pipes are mutually extruded by axial pretightening force to form a sealing interface. However, this conventional sealing structure has the following significant drawbacks: the separation risk is high, the conical surface compression structure introduces additional axial pretightening force and friction force at the separation surface, and uneven separation force, separation delay and even separation failure can be caused when the task load is separated from the boosting section, so that the unreliability and the safety risk of the aircraft in the separation stage are increased. Disclosure of Invention In view of the above-described drawbacks or shortcomings of the prior art, it is desirable to provide a parting plane oil drain seal. The invention provides a separating surface oil discharge sealing structure, which comprises: The fluid transmission mechanism is used for transmitting high-temperature cooling oil subjected to heat exchange with the engine and comprises a first oil discharge pipe and a second oil discharge pipe which are respectively arranged in the task load and the boosting structure, and the output end of the first oil discharge pipe is in butt joint and communication with the input end of the second oil discharge pipe; The thermal expansion sealing mechanism is sleeved at the communication part of the first oil discharge pipe and the second oil discharge pipe; the limiting mechanism is sleeved on the outer wall of the thermal expansion sealing mechanism and used for radially limiting the thermal expansion sealing mechanism; when the first oil drain pipe discharges high-temperature cooling oil to the second oil drain pipe, the thermal expansion sealing mechanism is heated to expand, and the limiting mechanism is used for enabling the thermal expansion sealing mechanism to expand inwards to seal the communication position of the first oil drain pipe and the second oil drain pipe. According to the technical scheme provided by the invention, the task load comprises a task load shell, the boosting structure comprises a boosting structure shell, the task load shell is abutted against the boosting structure shell, and the abutting surface is a separation surface. According to the technical scheme, a first groove is formed in the end face, close to the boosting structure shell, of the task load shell, a first through hole communicated with the inside of the task load shell is formed in the bottom of the first groove, the first oil drain pipe penetrates through the first through hole and extends into the first groove, a second groove is formed in the end face, close to the task load shell, of the boosting structure shell, a second through hole communicated with the inside of the boosting structure shell is formed in the bottom of the second groove, the second oil drain pipe penetrates through the second through hole and extends into the second groove, and the first groove corresponds to the second groove. According to the technical scheme, the thermal expansion sealing mechanism comprises a first thermal expansion bushing and a second thermal expansion bushing, the first thermal expansion bushing and the second thermal expansion bushing are respectively arranged in the first groove and the second groove, the first thermal expansion bushing is in butt joint with the second thermal expansion bushing, and the butt joint surface of the first thermal expansion bushing and the second thermal expansion bushing is coplanar with the separation surface. According to the technical scheme, the limiting mechanism comprises a first limiting bushing and a