CN110985210B - Micro-fine tube bundle type precooler membrane - Google Patents
Micro-fine tube bundle type precooler membrane Download PDFInfo
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- CN110985210B CN110985210B CN201911080492.9A CN201911080492A CN110985210B CN 110985210 B CN110985210 B CN 110985210B CN 201911080492 A CN201911080492 A CN 201911080492A CN 110985210 B CN110985210 B CN 110985210B
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- elastic sealing
- gas collecting
- sealing element
- tube bundle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
- F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
- F02C7/143—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Joints Allowing Movement (AREA)
Abstract
The invention discloses a micro-fine tube bundle type precooler membrane, which belongs to the technical field of micro-fine tube bundle type precooler membranes and comprises the following components: the device comprises a micro tube bundle, an elastic sealing element, a gas collecting tube and a spherical joint; the gas collecting pipe is of a tubular structure with a D-shaped radial section and is arranged on the plane of the D-shaped outer surface of the gas collecting pipe; two ends of the micro tube bundle are respectively inserted into the welding holes on the two gas collecting tubes and are fixedly connected; the outer surfaces of the spherical joints are spherical, and the two spherical joints are respectively sleeved on the outer circumferential surfaces at the two ends of the gas collecting pipe and are fixed by welding; the elastic sealing element is of an annular structure, the inner surface of the elastic sealing element is a spherical surface matched with the spherical joint, the outer annular surface of the elastic sealing element is a cylindrical surface, and the elastic sealing element can be elastically compressed along the radial direction of the elastic sealing element; the two spherical joints of each gas collecting pipe are respectively sleeved with an elastic sealing element, and the elastic sealing elements are matched with the spherical surfaces of the spherical joints; the invention can optimize the diaphragm structure of the existing precooler, improve the fatigue resistance and prolong the service life of the existing precooler.
Description
Technical Field
The invention belongs to the technical field of micro-fine tube bundle type precooler membranes, and particularly relates to a micro-fine tube bundle type precooler membrane.
Background
The precooler needs to bear the load excitation of high-speed and high-temperature airflow under a severe working condition. The precooler enhances heat exchange and plays an important role in improving the performance of the engine. The existing precooler consists of a plurality of precooler membranes, the precooler membranes consist of a plurality of micro-tubes (with the outer diameter of 1mm and the wall thickness of 50 mu m) which are arranged in parallel, and the micro-tubes are all bent according to Archimedes spiral; the micro-tube bundle type precooler has high heat dissipation capacity and compactness and remarkable advantages. Incoming air bypasses a micro-pipe structure of a membrane of the precooler, a karman vortex which falls off alternately can be generated, and the micro-pipe is subjected to vortex-induced load which is vertical to the direction alternation of the incoming air. Under the working state of the precooler membrane, the vortex-induced load is a high-frequency small-amplitude alternating load. The existing precooler membrane is analyzed and researched for fracture failure, so that the microtube is easy to fracture in a stress concentration area near the root of a brazing weld, and the fracture mode is fatigue fracture; the breakage is caused by that redundant brazing filler metal is accumulated on the surface of the micro-tube in the brazing process, so that the material becomes brittle and the fatigue resistance is reduced. Therefore, the existing precooler membrane has insufficient fatigue resistance and short service life.
Disclosure of Invention
In view of this, the invention provides a micro-fine tube bundle type precooler membrane, which can optimize the structure of the existing precooler membrane, improve the fatigue resistance and prolong the service life.
The invention is realized by the following technical scheme:
a micro-tube bundle precooler membrane, comprising: the device comprises a micro tube bundle, an elastic sealing element, a gas collecting tube and a spherical joint;
the micro-tube bundle is formed by arranging more than two micro-tubes in parallel, and each micro-tube is bent according to an Archimedes spiral;
the gas collecting pipe is of a tubular structure with a D-shaped radial section, and welding holes corresponding to the micro-tubes in the micro-tube bundle one by one are processed on the plane of the D-shaped outer surface of the gas collecting pipe; two ends of the micro tube bundle are respectively inserted into corresponding welding holes on the two gas collecting tubes so as to fixedly connect the micro tube bundle with the welding holes of the gas collecting tubes through brazing;
the outer surfaces of the spherical joints are spherical, and the two spherical joints are respectively sleeved on the outer circumferential surfaces at the two ends of the gas collecting pipe and are fixed by welding;
the elastic sealing element is of an annular structure, the inner surface of the elastic sealing element is a spherical surface matched with the spherical joint, the outer annular surface of the elastic sealing element is a cylindrical surface, and the elastic sealing element can be elastically compressed along the radial direction of the elastic sealing element; and two spherical joints of each gas collecting pipe are respectively sleeved with an elastic sealing element, and the elastic sealing elements are matched with the spherical surfaces of the spherical joints.
Furthermore, more than two annular grooves concentric with the elastic sealing element are processed on two end faces of the elastic sealing element, and the annular grooves on the two end faces are distributed at intervals, so that the radial section of the elastic sealing element is of a snake-shaped rotary structure.
Further, the mating surface between the elastic sealing element and the ball joint is provided with a graphite coating.
Furthermore, the two ends of the gas collecting pipe extend out of the connecting ends along the axial direction, the outer surfaces of the two connecting ends are cylindrical surfaces, and the cylindrical surfaces of the connecting ends are used for being matched with external connecting joints.
Has the advantages that: the gas collecting pipe adopts a D-shaped tubular structure, so that the phenomenon of embrittlement of the surface of a micro-pipe caused by accumulation of welding brazing filler metal at the welding position of the micro-pipe when the micro-pipe bundle and the gas collecting pipe are welded into a whole can be reduced, the consistency of welding quality is improved, and the fatigue resistance of a precooler membrane is further improved; the spherical joint can relieve the thermal deformation and the thermal stress of the micro-tube bundle in a high-temperature working environment, and reduce the amplitude of the alternating stress borne by the membrane of the precooler; the elastic sealing element not only can keep playing the function of dynamic sealing at high temperature, but also plays the role of vibration reduction; therefore, the invention can improve the fatigue resistance of the precooler membrane and prolong the service life of the precooler membrane.
Drawings
FIG. 1 is a structural component diagram of the present invention;
FIG. 2 is a schematic view of the connection between the gas manifold and the ball joint;
FIG. 3 is an axial cross-sectional view of FIG. 2;
FIG. 4 is a block diagram of the elastomeric seal;
FIG. 5 is an axial cross-sectional view of FIG. 4;
the device comprises a micro tube bundle 1, an elastic sealing element 2, a gas collecting tube 3 and a spherical joint 4.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a micro-tube bundle type precooler membrane, referring to the attached figure 1, which comprises the following components: the device comprises a micro tube bundle 1, an elastic sealing element 2, a gas collecting tube 3 and a spherical joint 4;
the micro-tube bundle 1 is formed by arranging more than two micro-tubes in parallel, and each micro-tube is bent according to an Archimedes spiral;
referring to fig. 2 and fig. 3, the gas collecting tube 3 is a tubular structure with a D-shaped radial cross section, two ends of the gas collecting tube extend out of the connecting end along the axial direction, and the outer surfaces of the two connecting ends are cylindrical surfaces, and the cylindrical surfaces of the connecting ends are used for matching with external connecting joints; welding holes corresponding to the micro-fine tubes in the micro-fine tube bundle 1 one by one are processed on the plane of the D-shaped outer surface of the gas collecting tube 3; two ends of the micro tube bundle 1 are respectively inserted into corresponding welding holes of the two gas collecting tubes 3, and brazing filler metal is uniformly coated between the micro tubes and the welding holes so as to fixedly connect the welding holes of the micro tube bundle 1 and the gas collecting tubes 3 through brazing; the brazing of the micro-tube bundle 1 on the plane is easier to operate than that on an arc surface, the consistency of the welding quality can be improved, and the phenomenon that redundant welding flux is accumulated on the wall surface of the micro-tube is reduced; the plane of the gas collecting pipe 3 can ensure the spraying uniformity of the anti-leakage coating and the high-temperature resistant coating at the joint of the two ends of the micro-tube bundle 1 and the gas collecting pipe 3; the gas collecting pipe 3 adopts a D-shaped tubular structure, and the part of the micro-tube bundle 1 inserted into the inner cavity of the gas collecting pipe 3 can be effectively cleaned, so that burrs of the micro-tube bundle 1 are removed, and the resistance of medium flow in the membrane of the precooler is reduced.
The outer surface of the spherical joint 4 is spherical, and the two spherical joints 4 are respectively sleeved on the outer circumferential surfaces of the two connecting ends of the gas collecting pipe 3 and are fixed by welding.
Referring to fig. 4 and 5, the elastic sealing element 2 is an annular structure, the inner annular surface of the elastic sealing element is a spherical surface matched with the spherical joint 4, the outer annular surface of the elastic sealing element is a cylindrical surface, a plurality of annular grooves concentric with the annular surface are processed on the two end surfaces of the elastic sealing element, and the annular grooves on the two end surfaces are distributed at intervals, so that the radial section of the elastic sealing element is of a snake-shaped rotary structure; the elastic seal 2 is compressible in its radial direction; the two elastic sealing elements 2 are respectively sleeved on the two spherical joints 4, and the elastic sealing elements 2 and the spherical joints 4 are in spherical surface fit so as to relieve the thermal deformation and the thermal stress of the precooler diaphragm in a high-temperature working environment; the matching surface is provided with a graphite coating which enables the elastic sealing element 2 and the spherical joint 4 to still keep sealing at high temperature;
when the gas collecting device works, two connecting ends of the gas collecting pipe 3 are respectively arranged on the support through connecting joints, and the elastic sealing pieces 2 at two ends of the gas collecting pipe 3 form dynamic seal with the support; when the precooler membrane vibrates, the elastic sealing element 2 can effectively absorb the vibration energy of the precooler membrane. When the membrane of the precooler is in a high-temperature thermal deformation state, the spherical joint 4 can give the gas collecting tube 3 certain degree of freedom along the bending direction, and the thermal deformation, thermal stress and high-frequency vibration of the membrane of the precooler are transmitted to the elastic sealing element 2, so that the stress concentration at the welding position of the micro-tube bundle 1 and the gas collecting tube 3 is effectively relieved, the high-cycle alternating stress borne by two tail ends of the micro-tube bundle is reduced, and the anti-fatigue capability of the micro-tube bundle is improved.
The precooler membrane is formed by the following steps:
firstly, processing a welding hole on the plane of the gas collecting pipe 3 by adopting electric spark;
secondly, inserting the micro-tubes into the welding holes of the gas collecting tube 3 in sequence, and uniformly coating brazing filler metal; then, redundant brazing filler metal on the wall surface of the micro-tube is treated;
thirdly, placing the brazing filler metal into a vacuum high-temperature furnace to complete the brazing filler metal welding process;
and fourthly, after welding is finished, spraying a leakage-proof coating and a high-temperature-resistant coating on the joint of the two ends of the micro tube bundle 1 and the gas collecting tube 3 in sequence.
Fifthly, fixing the spherical joints 4 at two ends of the gas collecting pipe 3 by welding;
and sixthly, mounting the elastic sealing element 2 outside the spherical joint 4, enabling the spherical joint 4 and the elastic sealing element 2 to form spherical fit, and coating graphite.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A micro-tube bundle precooler membrane, comprising: the device comprises a micro tube bundle (1), an elastic sealing element (2), a gas collecting tube (3) and a spherical joint (4);
the micro-tube bundle (1) is formed by arranging more than two micro-tubes in parallel, and each micro-tube is bent according to an Archimedes spiral;
the gas collecting pipe (3) is of a tubular structure with a D-shaped radial section, and welding holes corresponding to the micro-tubes in the micro-tube bundle (1) one by one are processed on the plane of the D-shaped outer surface of the gas collecting pipe (3); two tail ends of the micro tube bundle (1) are respectively inserted into corresponding welding holes on the two gas collecting tubes (3) so as to fixedly connect the micro tube bundle (1) with the welding holes of the gas collecting tubes (3) through brazing;
the outer surfaces of the spherical joints (4) are spherical, and the two spherical joints (4) are respectively sleeved on the outer circumferential surfaces at the two ends of the gas collecting pipe (3) and are fixed by welding;
the elastic sealing element (2) is of an annular structure, the inner surface of the elastic sealing element is a spherical surface matched with the spherical joint (4), the outer annular surface of the elastic sealing element is a cylindrical surface, and the elastic sealing element (2) can be elastically compressed along the radial direction of the elastic sealing element; an elastic sealing element (2) is sleeved on each of the two spherical joints (4) of each gas collecting pipe (3), and the elastic sealing elements (2) are in spherical surface fit with the spherical joints (4).
2. A micro-tube bundle precooler membrane as claimed in claim 1, wherein two or more concentric annular grooves are formed on both end faces of the elastic sealing member (2), and the annular grooves on both end faces are distributed at intervals so that the axial section of the elastic sealing member is of a serpentine rotary structure.
3. A micro-tube bundle precooler membrane according to claim 1, wherein the mating surface between the elastic seal (2) and the ball joint (4) is provided with a graphite coating.
4. A micro-micro tube bundle precooler membrane as claimed in claim 1, wherein connection ends extend from both ends of the gas collecting tube (3) in the axial direction, and the outer surfaces of both connection ends are cylindrical surfaces, and the cylindrical surfaces of the connection ends are used for matching with external connection joints.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080492.9A CN110985210B (en) | 2019-11-07 | 2019-11-07 | Micro-fine tube bundle type precooler membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080492.9A CN110985210B (en) | 2019-11-07 | 2019-11-07 | Micro-fine tube bundle type precooler membrane |
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| CN110985210A CN110985210A (en) | 2020-04-10 |
| CN110985210B true CN110985210B (en) | 2020-11-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113664317B (en) * | 2021-08-16 | 2023-10-24 | 西安远航真空钎焊技术有限公司 | Forming method of high-temperature alloy microcapillary with spiral line structure |
| CN114346355B (en) * | 2022-01-14 | 2023-10-13 | 北京动力机械研究所 | Positioning welding tool for assembling micro-fine tube membrane based on S-shaped positioning wire |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2519153A (en) * | 2013-10-11 | 2015-04-15 | Reaction Engines Ltd | Heat exchangers |
| CN204286184U (en) * | 2014-11-14 | 2015-04-22 | 夏文庆 | A kind of half adiabatic monolateral cold drawing |
| CN105156227A (en) * | 2015-09-29 | 2015-12-16 | 清华大学 | Pre-cooling air-breathing type variable cycle engine |
| CN105473973A (en) * | 2013-08-20 | 2016-04-06 | 三菱电机株式会社 | Heat exchanger, air conditioner, refrigeration cycle device, and method for producing heat exchanger |
| CN106949754A (en) * | 2017-03-02 | 2017-07-14 | 南京航空航天大学 | Small micro-channel heat exchanger and heat-exchange method |
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2019
- 2019-11-07 CN CN201911080492.9A patent/CN110985210B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473973A (en) * | 2013-08-20 | 2016-04-06 | 三菱电机株式会社 | Heat exchanger, air conditioner, refrigeration cycle device, and method for producing heat exchanger |
| GB2519153A (en) * | 2013-10-11 | 2015-04-15 | Reaction Engines Ltd | Heat exchangers |
| CN204286184U (en) * | 2014-11-14 | 2015-04-22 | 夏文庆 | A kind of half adiabatic monolateral cold drawing |
| CN105156227A (en) * | 2015-09-29 | 2015-12-16 | 清华大学 | Pre-cooling air-breathing type variable cycle engine |
| CN106949754A (en) * | 2017-03-02 | 2017-07-14 | 南京航空航天大学 | Small micro-channel heat exchanger and heat-exchange method |
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