CN114234238B - Rotatable efficient sealing device for variable geometry combustion chamber - Google Patents

Rotatable efficient sealing device for variable geometry combustion chamber Download PDF

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Publication number
CN114234238B
CN114234238B CN202111520036.9A CN202111520036A CN114234238B CN 114234238 B CN114234238 B CN 114234238B CN 202111520036 A CN202111520036 A CN 202111520036A CN 114234238 B CN114234238 B CN 114234238B
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wear
shaft sleeve
sleeve
resistant
sealing
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CN114234238A (en
Inventor
齐秀龙
刘世铮
李雅军
冉军辉
王威
任艳平
张国强
张晨曦
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703th Research Institute of CSIC
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703th Research Institute of CSIC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
    • F23R3/60—Support structures; Attaching or mounting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/00012—Details of sealing devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention belongs to the technical field of variable geometry combustion chambers, and particularly relates to a rotatable efficient sealing device for a variable geometry combustion chamber. According to the invention, through the effective combination of the shaft sleeve assembly, the rotating shaft assembly and the compression seal assembly, a wear-resistant rotating cavity is formed, on one hand, annular line contact is formed on the end face of the rotating shaft positioning boss by utilizing the tooth tops of the annular tooth seal ring, so that the contact area is reduced, and on the other hand, the small gaps between the tooth bottoms and the tooth tops on the two sides of the annular tooth seal ring and the sealing end face of the compression nut are filled with pasty lubricating grease, so that the rotating flexibility is improved; on the basis, the sealing modes of shaft sleeve interference fit, compressed thrust washers, pasty lubricating grease filled in small gaps between tooth tops of ring tooth sealing rings and sealing end surfaces of compression nuts and the like are combined, and high-efficiency sealing is realized while accurate positioning is realized. The invention can be widely applied to the gas turbine using the variable geometry combustion chamber, thereby realizing low emission and widening the low emission working range of the gas turbine.

Description

Rotatable efficient sealing device for variable geometry combustion chamber
Technical Field
The invention belongs to the technical field of variable geometry combustion chambers, and particularly relates to a rotatable efficient sealing device for a variable geometry combustion chamber.
Background
The low-emission gas turbine is used as important power equipment in the field of thermal energy power engineering, has the advantages of compact structure, high efficiency, low emission and the like, and has great potential for further popularization and application under the global energy-saving and emission-reduction background. The variable geometry combustion chamber is one of effective means for realizing the low emission gas turbine, an electric or pneumatic device is generally used outside to control a rotatable connecting device penetrating through a combustion casing, and a steering mechanism inside the combustion chamber is further controlled, so that the purpose of controlling internal mechanical equipment from the outside of the combustion casing and further changing the geometric dimension of an air channel is achieved, and finally, the variable geometry target is realized, thereby controlling the air quantity entering a combustion zone, such as the air quantity at the head part of a flame tube or the position of a main combustion hole, further controlling the temperature of the combustion zone, and keeping the temperature of core flame at a lower level under different working conditions, and realizing low emission. The variable geometry combustion chamber has higher design requirements on the rotary connecting device, can ensure flexible rotation under the external action, has smaller rotation moment, can ensure effective sealing under the action of high-temperature high-pressure gas in the cavity, and has no gas leakage. The application requirement of the rotary connecting device is high, the design is not easy, the sealing and the complex assembling process are not easy to ensure, and the rotary connecting device is one of the important reasons that the popularization and the application of the variable geometry combustion chamber are limited all the time, so that the practical application situation of the variable geometry combustion chamber is rarely reported, and the reasonable design of the rotary connecting device has important significance for promoting the development of the variable geometry combustion chamber.
Disclosure of Invention
The invention aims at providing a device for detecting the position of a motor. The rotatable high-efficiency sealing device for the variable geometry combustion chamber is simple in structure, flexible in action, high in reliability, good in sealing effect and convenient to assemble, disassemble and maintain, and the problem that external connection control and sealing of internal combustion air flow distribution control equipment in the combustion chamber are difficult when the variable geometry combustion chamber works under high-temperature and high-pressure conditions is solved.
A rotatable high-efficiency sealing device for a variable geometry combustion chamber comprises a shaft sleeve, a rotating shaft and a compression sealing assembly; the shaft sleeve is inserted into the mounting hole of the combustion chamber casing in an interference fit mode, and is axially and circumferentially positioned through the positioning pin; the central holes at the front end and the rear end of the shaft sleeve are respectively inserted with a wear-resistant sleeve, and the wear-resistant sleeves are fixed with the shaft sleeve through high-temperature-resistant adhesive to form a wear-resistant rotating cavity; the rotating shaft is inserted into the wear-resistant rotating cavity, the front end of the rotating shaft is positioned in the combustion chamber and connected with the internal connecting component, and the rear end of the rotating shaft is positioned outside the combustion chamber and connected with the external connecting component; the compression sealing assembly compresses the shaft sleeve, the first wear-resistant sleeve and the front part of the rotating shaft, and ensures the free rotation and reliable sealing of the rotating shaft.
Further, a gasket radial positioning boss and an axial positioning boss are arranged on the shaft body at the front part of the rotating shaft; the compression sealing assembly comprises a compression nut, a thrust washer and a ring tooth sealing ring; the tooth-shaped sealing ring is a revolving body gasket with teeth on two sides, the tooth-shaped sealing ring is sleeved on the outer side of a radial positioning boss of the gasket of the rotating shaft, and a tooth crest structure of the tooth-shaped sealing ring forms a plurality of loop line contacts on the end face of the radial positioning boss of the gasket; the thrust washer is sleeved on the outer side of the ring tooth sealing ring; the compression nut is sleeved on the outer side of the shaft sleeve, compresses the shaft sleeve, the thrust washer and the front part of the rotating shaft, fixes the ring gear sealing ring and forms a tiny gap with the ring gear sealing ring; paste grease is filled in the bottoms of the two sides of the annular tooth sealing ring and the tiny gap between the annular tooth sealing ring and the pressing end surface, so that the rotation flexibility is improved and the annular tooth sealing ring is efficiently sealed; the inner diameter of the thrust washer is slightly larger than the axial positioning boss of the rotating shaft, so that the axial positioning boss is ensured to be only in contact with the ring tooth sealing ring in the rotating process, and the rotating flexibility is ensured.
Further, the outer diameter middle section of the shaft sleeve is provided with a groove which is matched with the groove in the inner diameter middle section of the mounting hole of the combustion chamber casing to form an annular air cavity, so that on one hand, the shaft sleeve is convenient to mount in an interference manner, on the other hand, a cooling air cavity can be formed after the shaft sleeve is mounted, the influence of heat conduction on the shaft sleeve is slowed down, and the service life is prolonged.
Further, the wear-resistant sleeve is of a horn-shaped thin-wall structure, and wear-resistant coatings are coated on the inner annular surface of the expansion section and the inner annular surface of the straight section of the wear-resistant sleeve, so that the wear resistance of the wear-resistant sleeve when the wear-resistant sleeve contacts with two ends of the rotating shaft to rotate is improved; the front end of the shaft sleeve is provided with a shaft sleeve positioning boss, the outer contour of the shaft sleeve positioning boss is provided with external threads for being matched with the internal threads of the compression nut; the inside design of axle sleeve location boss has axle sleeve location boss sealed interior terminal surface for cooperate first wear-resisting telescopic horn mouth outer flat terminal surface.
The invention has the beneficial effects that:
according to the invention, through the effective combination of the shaft sleeve assembly, the rotating shaft assembly and the compression seal assembly, a wear-resistant rotating cavity is formed, on one hand, annular line contact is formed on the end face of the rotating shaft positioning boss by utilizing the tooth tops of the annular tooth seal ring, so that the contact area is reduced, and on the other hand, the small gaps between the tooth bottoms and the tooth tops on the two sides of the annular tooth seal ring and the sealing end face of the compression nut are filled with pasty lubricating grease, so that the rotating flexibility is improved; on the basis, the sealing modes of shaft sleeve interference fit, compressed thrust washers, pasty lubricating grease filled in small gaps between tooth tops of ring tooth sealing rings and sealing end surfaces of compression nuts and the like are combined, and high-efficiency sealing is realized while accurate positioning is realized. When the rotating shaft is driven by the external connecting piece to rotate along the central shaft, the internal connecting piece of the combustion chamber cavity can synchronously rotate under the condition of small moment and is well sealed, and the internal connecting piece further drives the cross-sectional area control device of the air channel in the combustion chamber to realize the function of changing geometry. The invention can be widely applied to the gas turbine using the variable geometry combustion chamber, thereby realizing low emission and widening the low emission working range of the gas turbine.
Drawings
Fig. 1 is a schematic view of the sealing device of the present invention when installed in a variable geometry combustor.
Fig. 2 is a partial enlarged view of the region D in fig. 1.
FIG. 3 is a block diagram of a ring seal in accordance with the present invention.
Fig. 4 is a view in the B direction of fig. 1.
Fig. 5 is a view in the direction C of fig. 1. .
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1:
the invention provides a rotatable efficient sealing device for a variable geometry combustion chamber, which comprises a shaft sleeve assembly, a rotating shaft assembly and a compression sealing assembly, wherein the shaft sleeve assembly is connected with the rotating shaft assembly; the shaft sleeve assembly comprises a shaft sleeve 2-1, a first wear-resistant sleeve 2-2, a second wear-resistant sleeve 2-3, a positioning pin 2-4 and a high-temperature adhesive 2-5 (figure 2); the rotating shaft assembly comprises a rotating shaft 3-1, a first bolt 3-2, a second bolt 3-3, an internal connecting piece 5-1 and an external connecting piece 5-2; the compression seal assembly comprises a compression nut 4-1 (figure 1), a thrust washer 4-2 (figure 2), a ring tooth seal ring 4-3 (figure 2) and pasty lubricating grease 4-4 (figure 2); the shaft sleeve component is inserted into the mounting hole 1-1a of the combustion chamber casing 1 in an interference fit manner, and is axially and circumferentially positioned through the positioning pin 2-4, so that the shaft sleeve component is prevented from rotating or falling out in the rotating working process of the rotating shaft 3-1; the first wear-resistant sleeve 2-2 and the second wear-resistant sleeve 2-3 are inserted into the central holes at the two ends of the shaft sleeve 2-1 and fixed by using a high-temperature adhesive 2-5 to form a wear-resistant rotating cavity; the rotating shaft 3-1 is inserted into the wear-resistant rotating cavity and compresses the thrust washer 4-2 under the action of the compression nut 4-1; the annular tooth sealing ring 4-3 is sleeved in the thrust washer 4-2, the crests of the annular tooth sealing ring form annular line contact on the end face of the rotary shaft positioning boss, small gaps are formed between the bottoms and the crests of the two sides and the sealing end face of the compression nut to be filled with pasty lubricating grease 4-4, and the rotary flexibility is improved while the efficient sealing is achieved. The free rotation angle of the rotating shaft is 360 degrees, so that the control range of the internal connecting piece is improved to the greatest extent, and the low-emission working range of the variable geometry combustion chamber is widened.
Example 2:
further, as shown in fig. 1, the rotary shaft 3-1 is a shaft type structure with square connectors at both ends. A gasket radial positioning boss 3-1c (fig. 1 and 2), an axial positioning boss 3-1d (fig. 1 and 2), a first wear-resistant section 3-1e and a second wear-resistant section 3-1f are sequentially arranged between the first square connector 3-1a and the second square connector 3-1b, and the two wear-resistant sections are spliced with the wear-resistant sleeve to provide two-point support for convenient rotation positioning. The respective outer sides of the square connectors are designed with pin fixing holes 3-1g and 3-1h for mounting a first pin 3-2 (fig. 1 and 4) and a second pin 3-3 (fig. 1 and 5) to fix the inner connection part 5-1 (fig. 1 and 4) and the outer connection part 5-2 (fig. 1 and 5), and the state after pin connection is shown in fig. 4 and 5.
As shown in fig. 1 and 2, the compression nut 4-1 is a compression member with a central hole 4-1a (fig. 2) and a compression end surface 4-1B (fig. 2), the diameter of the central hole 4-1a is slightly larger than that of the radial positioning boss 3-1c of the gasket, when the compression nut 4-1 is connected with the external thread of the shaft sleeve positioning boss 2-1a and fastened, the compression nut is ensured to be capable of compressing the thrust gasket 4-2 and simultaneously fixing the ring tooth sealing ring 4-3 and the rotating shaft 3-1, and forms a tiny gap of 0.01-0.02mm with the ring tooth sealing ring for filling the pasty lubricating grease 4-4.
As shown in fig. 1 and 2, the thrust washer 4-2 is a sealing washer with higher hardness, sealing surfaces on two sides are respectively attached to the compression end surface 4-1B of the compression nut 4-1 and the first sealing end surface 2-1C of the shaft sleeve 2-1, the surfaces are smooth enough to ensure the tightness of the compression state, the inner diameter of the thrust washer 4-2 is slightly larger than the axial positioning boss 3-1d of the rotating shaft 3-1, and the rotating shaft positioning boss 3-1d is ensured to be only contacted with the ring tooth sealing ring 4-3 in the rotating process, so that the rotating flexibility is ensured. The inner diameter of the thrust washer 4-2 is consistent with the outer diameter of the ring tooth sealing ring 4-3, and the thrust washer and the ring tooth sealing ring are matched and sleeved.
As shown in fig. 1 and 2, the ring tooth seal ring 4-3 is a revolution solid gasket with teeth on both sides (fig. 3), including a root and a crest. The inner diameter of the ring is consistent with the outer diameter of a radial positioning boss 3-1c of a gasket of the rotating shaft 3-1. After the installation, a plurality of loop line contacts are formed when the crest structure of the ring tooth sealing ring 4-3 contacts with the matching surface, so that the contact area between the crest structure and the compression end surface 4-1B of the compression nut 4-1 and the end surface of the positioning boss 3-1d can be reduced, and the rotation flexibility is improved; paste grease is filled in the bottoms of the two sides of the ring tooth sealing ring and the small gap between the ring tooth sealing ring and the compression end surface 4-1B, so that the ring tooth sealing ring is sufficiently lubricated, the rotation flexibility is further enhanced, meanwhile, good tightness is ensured, and good sealing and free rotation under high-temperature and high-pressure conditions are finally realized.
Example 3:
further, as shown in fig. 1, the shaft sleeve 2-1 is of a long rod sleeve type structure, the outer diameter of the shaft sleeve 2-1 is consistent with the inner diameter of the mounting hole 1-1a on the combustion chamber casing 1, the shaft sleeve 2-1 is inserted into the mounting hole in an interference fit mounting mode, after preliminary positioning is performed by using the shaft sleeve positioning boss 2-1a during mounting, the shaft sleeve 2-1 can be prevented from moving axially and rotating circumferentially through the positioning pin 2-4 in a fixed and locked manner, and the integration of the shaft sleeve 2-1 and the combustion chamber casing 1 is realized. The inner diameter of the shaft sleeve 2-1 is consistent with the outer diameters of the first wear-resistant sleeve 2-2 and the second wear-resistant sleeve 2-3, so that the wear-resistant sleeves are convenient to insert and mount. The two ends of the shaft sleeve 2-1 are respectively a first sealing end face 2-1C (figure 2) of the shaft sleeve and a second sealing end face 2-1D of the shaft sleeve, the two end faces are smooth enough to ensure tightness, and in addition, the inner part of the shaft sleeve positioning boss 2-1a is provided with a shaft sleeve positioning boss sealing inner end face 2-1B (figure 1) for being matched with the horn mouth outer flat end face of the first wear-resistant sleeve 2-2. The outer contour of the shaft sleeve positioning boss 2-1a is provided with external threads, and can be matched with the internal threads of the compression nut 4-1. The middle section of the outer diameter of the shaft sleeve 2-1 is provided with a groove which is matched with the groove of the middle section of the inner diameter of the mounting hole 1-1a to form an annular air cavity 1-A, so that the shaft sleeve 2-1 is convenient to mount in interference on one hand, and a cooling air cavity can be formed after the shaft sleeve is mounted on the other hand, the influence of heat conduction on the shaft sleeve 2-1 is slowed down, and the service life is prolonged.
As shown in FIG. 1, the first wear-resistant sleeve 2-2 and the second wear-resistant sleeve 2-3 are of horn-shaped thin-wall structures, and wear-resistant coatings are coated on the inner annular surface 2-2A (FIG. 2) of the expansion section and the inner annular surface 2-2B (FIG. 2) of the straight section, so that the wear resistance of the rotating shaft 3-1 during contact rotation is improved. The two wear-resistant sleeves are arranged at the two ends of the central hole of the shaft sleeve 2-1, the outer ring surface of the expansion section is matched with the inner sealing end surface 2-1B of the positioning boss of the shaft sleeve and the second sealing end surface 2-1D of the shaft sleeve, and the contact position is coated with high-temperature-resistant adhesive 2-5 (figure 2), so that the wear-resistant sleeves and the shaft sleeve are well fixed, the good sealing between the wear-resistant sleeves and the shaft sleeve is ensured, and a wear-resistant rotating cavity is formed.
Example 4:
the specific implementation process of the invention is as follows:
the shaft sleeve 2-1 is inserted (interference) into the mounting hole of the combustion chamber casing 1-1a from the inside N of the combustion chamber, the positioning surface of the axial positioning boss 2-1a of the shaft sleeve 2-1 is contacted with the inner end surface of the mounting hole of the combustion chamber casing 1-1a, the pin hole on the side of the positioning boss 2-1a of the shaft sleeve 2-1 and the pin hole on the casing are in the same casing section in the assembling process, and the positioning pin 2-4 penetrates through the pin hole on the casing 1 to enter the pin hole on the shaft sleeve, so that the axial and circumferential positions of the shaft sleeve 2-1 are fixed.
The outer ring surfaces of the two wear-resistant sleeves 2-2 and 2-3 are coated with high-temperature adhesive 2-5 and are inserted into the two ends of the shaft sleeve 2-1, so that the outer ring surface of the expansion section of the wear-resistant sleeve is well attached to the two end surfaces of the shaft sleeve 2-1, and the wear-resistant sleeve is cured and sealed for a certain time.
The rotating shaft 3-1 is inserted into the two installed wear-resistant sleeves, and the outer end face of the wear-resistant boss 3-1e of the rotating shaft 3-1 is well attached to the flat end face of the bell mouth inner ring of the wear-resistant sleeve. And then the annular tooth sealing ring 4-3, the thrust washer 4-2 and the compression nut 4-1 are sequentially arranged, the pressure nut 4-1 is screwed up according to the moment requirement, namely the thrust washer 4-2 is compressed, and at the moment, a tiny gap between the annular tooth sealing ring 4-3 and the compression end face of the compression nut 4-1 is filled with lubricating grease 4-4, so that the free rotation and reliable sealing of rotation are ensured.
As shown in FIG. 1, after the installation of the invention is completed, when the variable geometry combustion chamber works under any working condition of high temperature and high pressure, the inside N of the combustion chamber is filled with high temperature and high pressure air, when the air quantity involved in combustion needs to be regulated and controlled by the air through-flow condition, the external connecting piece 5-2 is driven by a pneumatic or electric device arranged outside the combustion chamber W, and drives the rotation shaft to rotate through a second square connector 3-1b of the rotation shaft 3-1, at the moment, the first square connector 3-1a of the rotation shaft 3-1 follows synchronous rotation to drive the internal connecting piece 5-1 to rotate, and then the opening of an air through-flow channel, namely the geometric area of a through-flow cavity, is controlled, so that the air quantity involved in combustion is controlled. At the moment, the high-efficiency sealing is realized by the combination of sealing modes such as interference fit of the shaft sleeve, compressed thrust washers, pasty lubricating grease filled in a tiny gap between the tooth tops of the ring tooth sealing rings and the sealing end face of the compression nut, and the like. When the working condition of the gas turbine changes, the rotation speed is controlled according to the requirement, and the low-emission working range of the variable geometry combustion chamber is widened.
The variable geometry combustion chamber can reduce emission without sacrificing combustion performance by controlling the air quantity participating in combustion, and can avoid the problem of overlarge diameter and larger occupied space of a gas turbine caused by overlarge head of the combustion chamber due to staged combustion. The invention makes the overall layout of the gas turbine more compact, the middle-sized and small-sized gas turbine more suitable, and the arrangement space is reasonably utilized. In addition, the invention can be used singly or a plurality of the annular combustion chambers are arranged on the combustion chamber casing in a circumferential direction for simultaneous use, and when a plurality of annular combustion chambers are used simultaneously, a plurality of diffuser channels corresponding to flame barrels of the annular combustion chambers or annular combustion chambers can reasonably configure combustion air quantity under different working conditions in a dislocation control mode.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A rotatable high efficiency sealing device for a variable geometry combustor, characterized by: comprises a shaft sleeve (2-1), a rotating shaft (3-1) and a compression sealing component; the shaft sleeve (2-1) is inserted into the mounting hole (1-1 a) of the combustion chamber casing (1) in an interference fit mode, and is axially and circumferentially positioned through the positioning pin (2-4); the central holes at the front end and the rear end of the shaft sleeve (2-1) are respectively inserted with a first wear-resistant sleeve (2-2) and a second wear-resistant sleeve (2-3), and the first wear-resistant sleeve (2-2) and the second wear-resistant sleeve (2-3) are fixed with the shaft sleeve (2-1) through high-temperature-resistant adhesives (2-5) to form a wear-resistant rotating cavity; the rotating shaft (3-1) is inserted into the wear-resistant rotating cavity, the front end of the rotating shaft (3-1) is positioned in the combustion chamber and connected with the internal connecting component (5-1), and the rear end of the rotating shaft (3-1) is positioned outside the combustion chamber and connected with the external connecting component (5-2); the compression sealing assembly compresses the shaft sleeve (2-1), the first wear-resistant sleeve (2-2) and the front part of the rotating shaft (3-1), so that the rotating shaft (3-1) is guaranteed to freely rotate and reliably seal; the middle section of the outer diameter of the shaft sleeve (2-1) is provided with a groove which is matched with the groove at the middle section of the inner diameter of the mounting hole (1-1 a) of the combustion chamber casing (1) to form an annular air cavity (1-A), so that the shaft sleeve (2-1) is convenient to be mounted in interference on one hand, and a cooling air cavity can be formed after the shaft sleeve is mounted on the other hand, the influence of heat conduction on the shaft sleeve (2-1) is slowed down, and the service life is prolonged.
2. A rotatable high efficiency sealing apparatus for a variable geometry combustor as defined in claim 1, wherein: a gasket radial positioning boss (3-1 c) and an axial positioning boss (3-1 d) are arranged on the shaft body at the front part of the rotating shaft (3-1); the compression sealing assembly comprises a compression nut (4-1), a thrust washer (4-2) and a ring tooth sealing ring (4-3); the ring tooth sealing ring (4-3) is a revolving body gasket with teeth on two sides, the ring tooth sealing ring (4-3) is sleeved on the outer side of a gasket radial positioning boss (3-1 c) of the rotating shaft (3-1), and a tooth crest structure of the ring tooth sealing ring (4-3) forms a plurality of loop line contacts on the end face of the gasket radial positioning boss (3-1 c); the thrust washer (4-2) is sleeved on the outer side of the ring tooth sealing ring (4-3); the compression nut (4-1) is sleeved on the outer side of the shaft sleeve (2-1), compresses the shaft sleeve (2-1), the thrust washer (4-2) and the front part of the rotating shaft (3-1), fixes the ring tooth sealing ring (4-3) and forms a tiny gap with the ring tooth sealing ring (4-3); paste grease (4-4) is filled in the bottoms of the two sides of the annular tooth sealing ring (4-3) and the tiny gap between the annular tooth sealing ring and the pressing end surface (4-1B), so that the rotation flexibility is improved and the sealing is efficient; the inner diameter of the thrust washer (4-2) is slightly larger than the axial positioning boss (3-1 d) of the rotating shaft (3-1), so that the axial positioning boss (3-1 d) is only contacted with the ring tooth sealing ring (4-3) in the rotating process, and the rotating flexibility is ensured.
3. A rotatable high efficiency sealing apparatus for a variable geometry combustor as claimed in claim 2, wherein: the first wear-resistant sleeve (2-2) and the second wear-resistant sleeve (2-3) are of horn-shaped thin-wall structures, wear-resistant coatings are coated on inner annular surfaces (2-2A) of expansion sections and inner annular surfaces (2-2B) of straight sections of the first wear-resistant sleeve (2-2) and the second wear-resistant sleeve (2-3), and wear resistance when the wear-resistant sleeves are in contact rotation with two ends of the rotating shaft (3-1) is improved; the front end of the shaft sleeve (2-1) is provided with a shaft sleeve positioning boss (2-1 a), and the outer contour of the shaft sleeve positioning boss (2-1 a) is provided with external threads for being matched with the internal threads of the compression nut (4-1); the inside of the shaft sleeve positioning boss (2-1 a) is provided with a shaft sleeve positioning boss sealing inner end face (2-1B) which is used for being matched with the horn mouth outer flat end face of the first wear-resistant sleeve (2-2).
CN202111520036.9A 2021-12-13 2021-12-13 Rotatable efficient sealing device for variable geometry combustion chamber Active CN114234238B (en)

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CN202111520036.9A CN114234238B (en) 2021-12-13 2021-12-13 Rotatable efficient sealing device for variable geometry combustion chamber

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Application Number Priority Date Filing Date Title
CN202111520036.9A CN114234238B (en) 2021-12-13 2021-12-13 Rotatable efficient sealing device for variable geometry combustion chamber

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CN114234238A CN114234238A (en) 2022-03-25
CN114234238B true CN114234238B (en) 2023-05-30

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545196A (en) * 1982-07-22 1985-10-08 The Garrett Corporation Variable geometry combustor apparatus
FR3065059B1 (en) * 2017-04-11 2020-11-06 Office National Detudes Rech Aerospatiales SELF-ADAPTIVE VARIABLE GEOMETRY GAS TURBINE FIREPLACE
CN109372592B (en) * 2018-11-27 2019-09-24 中国航发沈阳发动机研究所 A kind of regulating mechanism with displacement coordination ability

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