CN116085119A - Sealing and connecting structure for impellers - Google Patents

Sealing and connecting structure for impellers Download PDF

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Publication number
CN116085119A
CN116085119A CN202310172192.3A CN202310172192A CN116085119A CN 116085119 A CN116085119 A CN 116085119A CN 202310172192 A CN202310172192 A CN 202310172192A CN 116085119 A CN116085119 A CN 116085119A
Authority
CN
China
Prior art keywords
sealing
end tooth
connecting structure
tooth ring
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310172192.3A
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Chinese (zh)
Inventor
杨玲
潘尚能
陈辉风
冯晨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Aviation Powerplant Research Institute AECC
Original Assignee
Hunan Aviation Powerplant Research Institute AECC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Aviation Powerplant Research Institute AECC filed Critical Hunan Aviation Powerplant Research Institute AECC
Priority to CN202310172192.3A priority Critical patent/CN116085119A/en
Publication of CN116085119A publication Critical patent/CN116085119A/en
Pending legal-status Critical Current

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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
    • F02C7/28—Arrangement of seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • 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
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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

Abstract

The invention belongs to the field of auxiliary power devices, and particularly relates to a sealing and connecting structure for impellers, which comprises an end tooth ring, a centrifugal impeller and a centripetal impeller, wherein the end tooth ring is used for centering with the centrifugal impeller and transmitting torque. According to the invention, the sealing comb tooth structure and the circular arc end tooth structure are arranged to be matched with the honeycomb to form the sealing structure, the large cavity between the air compressor and the turbine is divided into two small cavities through the partition plate, the partition plate is radially matched with the air compressor rotor and the turbine rotor by adopting a small clearance, the honeycomb is welded on the cylindrical surface of the inner ring of the partition plate, the cold air flow is reduced, the efficiency of the APU is improved, and the end tooth ring adopts a detachable connection mode of the end face and the cylindrical surface, such as comb tooth abrasion, and the end tooth ring can be replaced, so that the maintainability of the structure is improved.

Description

Sealing and connecting structure for impellers
Technical Field
The invention belongs to the field of auxiliary power devices, and particularly relates to a sealing and connecting structure for impellers.
Background
The auxiliary power device is a small auxiliary power device which can independently output compressed air or supply power besides a main power device (engine) on the aircraft. Typically a small gas turbine engine. Comprises a power output shaft, a compressed air leading-out device, an automatic control device and the like. Compressed air is provided for the aircraft before take-off, the air conditioner system of the aircraft can be used for supplying air or providing air source starting for a main engine starter, and electric power can be output for an aircraft electric power system before the main engine is started, so that the dependence of the aircraft on airport equipment is reduced; in flight, when the main engine or the power generation device thereof fails, emergency energy can be provided for the aircraft, so that the flight safety is improved; upon landing, the aircraft may also be powered. Auxiliary power devices are arranged on the large and medium-sized airplanes and the large-sized helicopters.
A partition plate is adopted between a centrifugal compressor and a centripetal turbine of the conventional auxiliary power device to divide a large chamber between the compressor and the turbine into two small chambers. The centrifugal compressor and the centripetal turbine rotor are generally centered by adopting a cylindrical surface, friction between the cylindrical surface and the end surface and pin torque transmission are carried out, or arc end teeth are adopted for centering and torque transmission, in order to prevent rotor and stator scraping, a large clearance fit is adopted between a baffle plate and the compressor rotor and the turbine rotor in the radial direction, no sealing effect is achieved, and the efficiency of an auxiliary power device (hereinafter referred to as APU) can be reduced under the same flow and other parameter conditions.
In order to solve the problems of positioning, torque transmission and sealing of the centrifugal impeller and the turbine centripetal impeller of the APU compressor, it is necessary to design an integrated structure of the circular arc end teeth and the sealing comb teeth structure, so that the number of parts is reduced, the flow rate of cold air to the turbine end is reduced through the integrated structure of the circular arc end teeth and the sealing comb teeth structure and small clearance fit, the efficiency of the auxiliary power device is improved, and the use reliability and maintainability of the auxiliary power device are improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a sealing and connecting structure for impellers, which reduces the number of parts through an integrated design of circular arc end teeth and sealing comb teeth, and simultaneously reduces the flow rate of cold air to a turbine end through clearance fit of the integrated structure of the circular arc end teeth and the sealing comb teeth, improves the efficiency of an auxiliary power device, and improves the use reliability and maintainability of the auxiliary power device.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a sealing and connecting structure used between impellers comprises an end tooth ring, a centrifugal impeller and a centripetal impeller, wherein the end tooth ring is used for centering with the centrifugal impeller and transmitting torque.
Further, one side of the end tooth ring is provided with an arc end tooth.
Further, the centrifugal impeller is provided with grooves, and the grooves are in one-to-one correspondence with the circular arc end teeth and are clamped.
Further, the inner ring of the end tooth ring is a smooth curved surface, an annular limiting block is arranged at the position, corresponding to the inner ring of the end tooth ring, of the centripetal impeller, and the inner ring of the end tooth ring is attached to the outer circumferential surface of the annular limiting block.
Further, the other side of the end tooth ring is an end face which is detachably connected with the centripetal impeller.
Further, the circumference of the end tooth ring is provided with a sealing comb tooth.
Further, an annular partition plate is arranged on the outer side of the sealing comb teeth.
Further, the honeycomb is fixedly connected with the inner ring cylindrical surface of the partition plate.
Further, a gap is reserved between the honeycomb and the sealing comb teeth, and the gap is not more than 0.3mm.
Further, the gap and the spaces on both sides of the partition plate constitute a flow path.
The invention has the technical effects and advantages that:
1. according to the invention, the sealing comb tooth structure and the circular arc end tooth structure are arranged to be matched with the honeycomb to form the sealing structure, the large chamber between the compressor and the turbine is divided into two small chambers through the partition plate, the partition plate is radially matched with the compressor rotor and the turbine rotor by adopting a small clearance, the honeycomb is welded on the cylindrical surface of the inner ring of the partition plate, the cold air flow is reduced, and the efficiency of the APU is improved.
2. The structure of the invention allows the sealing comb teeth and the honeycomb to be slightly scraped, thereby greatly improving the reliability of the structure.
3. The end tooth ring adopts a detachable connection mode of the end face and the cylindrical surface, such as abrasion of the comb teeth, and the end tooth ring can be replaced, so that the maintainability of the structure is improved.
4. The arc end tooth structure and the sealing comb tooth structure are integrally designed, so that the number of parts is reduced, and the device structure is optimized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a schematic view of a seal and connection structure for use between impellers according to the present invention;
fig. 2 is a schematic structural view of an end tooth ring according to the present invention.
Reference numerals: 1. arc end teeth; 2. sealing the comb teeth; 3. an end face; 4. an end toothed ring; 5. a centrifugal impeller; 6. a honeycomb; 7. a flow path; 8. a centripetal impeller; 9. a partition plate; 10. an inner ring; 11. an annular limiting block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural view of a seal and connection structure for impellers of the present invention, and as shown in fig. 1, the present invention provides a seal and connection structure for impellers of the present invention, including an end tooth ring 4, a centrifugal impeller 5 and a centripetal impeller 8, wherein the end tooth ring 4 is used for centering with the centrifugal impeller 5 and transmitting torque.
Further, one side of the end tooth ring 4 is provided with an arc end tooth 1, the centrifugal impeller 5 is provided with a groove, the groove is in one-to-one correspondence with the arc end tooth 1 and meshed with the arc end tooth 1, for example, the arc end tooth 1 is designed to be a boss with a narrow upper part and a wide lower part, the groove is arranged to be a tooth slot with a wide upper part and a narrow lower part and matched with the arc end tooth 1 in one-to-one correspondence and matched with the size, stability of transmission between the end tooth ring 4 and the centrifugal impeller 5 is ensured, the other side of the end tooth ring 4 is an end face 3, the end face 3 is attached to the centripetal impeller 8, the end face 3 is detachably connected with the centripetal impeller 8, for example, two cylindrical holes are symmetrically arranged on the end face 3, a locating pin is arranged at a corresponding connection position of the centripetal impeller 8, and the end face 3 is detachably connected with the centripetal impeller 8 through the cylindrical holes and the locating pin.
Further, fig. 2 is a schematic structural diagram of an end tooth ring 4 of the present invention, as shown in fig. 2, a sealing comb tooth 2 is disposed on an outer circumferential surface of an outer ring of the end tooth ring 4, an annular partition 9 is disposed on an outer side of the sealing comb tooth 2, a honeycomb 6 is fixedly connected to an inner ring cylindrical surface of the partition 9, a gap is left between the honeycomb 6 and the sealing comb tooth 2, the gap is not more than 0.3mm, a flow path 7 is formed by the gap and spaces on two sides of the partition 9, an inner ring 10 of the end tooth ring 4 is a smooth curved surface, an annular limiting block 11 is disposed at a position of the inner ring 10 of the centripetal impeller 8 corresponding to the end tooth ring 4, the inner ring 10 of the end tooth ring 4 is attached to an outer circumferential surface of the annular limiting block 11, and functions of limiting and fixing the end tooth ring 4 are achieved.
The working principle of the invention is that a large chamber between a compressor and a turbine is divided into two small chambers through a partition plate 9, the partition plate 9 is in radial clearance fit with the compressor rotor and the turbine rotor, a honeycomb 6 is welded on the inner ring cylindrical surface of the partition plate 9, a clearance is kept between the honeycomb 6 and a sealing comb tooth 2 and is controlled within 0.3mm, when air flows from the end of a centrifugal impeller 5 to the end of the centripetal impeller 8 through the structure of the sealing comb tooth 2 and the honeycomb 6, the air flow passes through a flow path 7, the air flow speed is reduced, the radial clearance at the sealing position can be reduced to 0.3mm, the air flow is reduced, the efficiency of an APU (auxiliary power unit) can be improved under the parameter conditions of the inlet flow of the APU, and the like, and meanwhile, the structure allows the sealing comb tooth 2 and the honeycomb 6 to be slightly scraped, and the reliability of the structure is improved. If the scraping is serious, the end tooth ring 4 with lower cost can be replaced, the centripetal impeller 8 with higher cost does not need to be replaced, the maintainability of the structure is improved, on the other hand, the structure of the sealing comb tooth 2 and the structure of the circular arc end tooth 1 are integrally designed, the number of parts is reduced, the structure is simplified, and the whole disassembly and the assembly are convenient.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. The sealing and connecting structure for the impellers is characterized by comprising an end tooth ring (4), a centrifugal impeller (5) and a centripetal impeller (8), wherein the end tooth ring (4) is used for centering with the centrifugal impeller (5) and transmitting torque.
2. A sealing and connecting structure for use between impellers according to claim 1, characterised in that one side of the end tooth ring (4) is provided with circular arc end teeth (1).
3. A sealing and connecting structure for impellers according to claim 2, characterized in that the centrifugal impeller (5) is provided with grooves, which are in one-to-one correspondence and snap-fit with the circular arc end teeth (1).
4. The sealing and connecting structure for impellers according to claim 2, wherein the inner ring (10) of the end tooth ring (4) is a smooth curved surface, an annular limiting block (11) is arranged at the position, corresponding to the inner ring (10) of the end tooth ring (4), of the centripetal impeller (8), and the inner ring (10) of the end tooth ring (4) is attached to the outer circumferential surface of the annular limiting block (11).
5. A sealing and connecting structure for impellers according to claim 2, characterized in that the other side of the end tooth ring (4) is an end face (3), said end face (3) being detachably connected to the centripetal impeller (8).
6. A sealing and connecting structure between impellers according to claim 2, characterized in that the peripheral surface of the end tooth ring (4) is provided with sealing comb teeth (2).
7. The sealing and connecting structure for impellers according to claim 6, characterized in that the outer side of the sealing comb teeth (2) is provided with an annular partition plate (9).
8. The sealing and connecting structure for impellers according to claim 7, wherein the inner ring cylindrical surface of the partition plate (9) is fixedly connected with a honeycomb (6).
9. A sealing and connecting structure for use between impellers according to claim 8, characterised in that a gap is left between the honeycomb (6) and the sealing comb (2), said gap not exceeding 0.3mm.
10. A sealing and connecting structure for use between impellers according to claim 9, characterised in that the gap and the spaces on both sides of the partition (9) constitute a flow path (7).
CN202310172192.3A 2023-02-27 2023-02-27 Sealing and connecting structure for impellers Pending CN116085119A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310172192.3A CN116085119A (en) 2023-02-27 2023-02-27 Sealing and connecting structure for impellers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310172192.3A CN116085119A (en) 2023-02-27 2023-02-27 Sealing and connecting structure for impellers

Publications (1)

Publication Number Publication Date
CN116085119A true CN116085119A (en) 2023-05-09

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Application Number Title Priority Date Filing Date
CN202310172192.3A Pending CN116085119A (en) 2023-02-27 2023-02-27 Sealing and connecting structure for impellers

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117952038A (en) * 2024-03-25 2024-04-30 中国航发四川燃气涡轮研究院 Pneumatic optimization design method of pre-rotation air supply system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117952038A (en) * 2024-03-25 2024-04-30 中国航发四川燃气涡轮研究院 Pneumatic optimization design method of pre-rotation air supply system
CN117952038B (en) * 2024-03-25 2024-05-31 中国航发四川燃气涡轮研究院 Pneumatic optimization design method of pre-rotation air supply system

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