CN112360573B - Rotating assembly of compact radial-flow turbine thermoelectric conversion system - Google Patents

Rotating assembly of compact radial-flow turbine thermoelectric conversion system Download PDF

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Publication number
CN112360573B
CN112360573B CN202011154650.3A CN202011154650A CN112360573B CN 112360573 B CN112360573 B CN 112360573B CN 202011154650 A CN202011154650 A CN 202011154650A CN 112360573 B CN112360573 B CN 112360573B
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main shaft
assembled
motor rotor
turbine
thermoelectric conversion
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CN112360573A (en
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王正
马同玲
赵伟
王力国
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Beijing Power Machinery Institute
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Beijing Power Machinery Institute
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    • 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
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • 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
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F16C3/023—Shafts; Axles made of several parts, e.g. by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a rotating assembly of a compact radial-flow turbine thermoelectric conversion system, which comprises a nut, a shaft sleeve, a motor rotor, a main shaft, a compressor impeller and a turbine impeller. According to the size parameters of a turbine, a compressor and a motor of the closed circulation runoff turbine thermoelectric conversion system, on the basis of determining the size parameters and the assembly torque of a rotating assembly, the nut, the shaft sleeve, the motor rotor, the main shaft, the compressor impeller and the turbine impeller are processed, and the complete closed Brayton circulation thermoelectric conversion system rotating assembly is formed by sequentially completing the assembly of the motor rotor, the assembly of the main shaft and the compressor impeller, the assembly of the main shaft and the turbine impeller, the assembly of the main shaft and the motor rotor, the assembly of the shaft sleeve and the motor rotor and the main shaft and the assembly of the nut and the main shaft. The rotating assembly structure has the characteristics of good compactness, high rigidity and the like, the connection strength and the rigidity of the rotating assembly structure of the runoff closed Brayton cycle power generation system can be improved, and the service reliability of the system is enhanced.

Description

Rotating assembly of compact radial-flow turbine thermoelectric conversion system
Technical Field
The invention belongs to the technical field of closed Brayton cycle thermoelectric conversion system structural design, and particularly relates to a compact radial flow turbine thermoelectric conversion system rotating assembly.
Background
The closed Brayton cycle thermoelectric conversion system is used as a novel thermoelectric conversion form, and can realize conversion from heat energy to mechanical work by means of a certain gas working medium through thermal processes such as heat absorption, expansion work, heat release, compression and the like in a closed environment, and further convert the mechanical work into electric energy through a generator. In the working process of the closed Brayton cycle thermoelectric conversion system, only energy exchange with the outside is carried out, and no working medium exchange exists. A typical closed brayton cycle thermoelectric conversion system is structurally composed mainly of components such as a turbine, a compressor, a generator, a regenerator, a cooler, a heat source and the like.
The rotating component is the most central component in the closed Brayton cycle thermoelectric conversion system and has a decisive influence on the overall performance and structure, reliability and service life of the closed Brayton cycle thermoelectric conversion system. In the operation process of the closed Brayton cycle thermoelectric conversion system, the rotating component is in a high-speed rotating state, the rotating speed of the rotating component can reach tens of thousands of revolutions per minute, and even hundreds of thousands of revolutions per minute, once the rotating component fails, the closed Brayton cycle thermoelectric conversion system can not work normally, and the structural damage of the system can be caused. Therefore, reasonable design of the rotating assembly structure is important to ensure the structural reliability of the closed brayton cycle thermoelectric conversion system.
The rotating assembly structure of the existing closed Brayton cycle thermoelectric conversion system is mainly assembled by parts such as a turbine rotating shaft, a main shaft, a compressor impeller, a motor rotor, a coupler and the like, and specifically comprises the following parts: the turbine rotating shaft and the compressor impeller are connected together through the main shaft to form a power rotating shaft, and then the power rotating shaft and the motor rotor are connected together through the coupler to form a complete rotating assembly. The rotating assembly structure can effectively improve the stable working rotation speed, but because the connecting positions are multiple, the axial size is large, and the interference connecting structure is adopted in a large amount, the high requirements are put forward on the processing and assembling precision of the assembly, the difficulty in ensuring the connecting strength and the rigidity is high, and the working reliability of the closed Brayton cycle thermoelectric conversion system is affected.
The rotor structure of the closed Brayton cycle thermoelectric conversion system is reasonably designed according to the characteristics and the use requirements of the rotor of the closed Brayton cycle thermoelectric conversion system, so that the manufacturing and assembling process difficulty is reduced, and the key of improving and guaranteeing the working reliability and service life of the closed Brayton cycle thermoelectric conversion system is provided.
Disclosure of Invention
The invention provides a compact radial flow turbine thermoelectric conversion system rotating assembly aiming at the structural design problem of a closed Brayton cycle thermoelectric conversion system, which comprises a nut, a shaft sleeve, a motor rotor, a main shaft, a compressor impeller and a turbine impeller. According to the structural size parameters of a turbine, a compressor and a motor of the closed Brayton cycle thermoelectric conversion system, on the basis of determining the size parameters and the assembly torque of a rotating assembly, the nut, the shaft sleeve, the motor rotor, the main shaft, the compressor impeller and the turbine impeller are processed, and the complete closed Brayton cycle thermoelectric conversion system rotating assembly is formed by sequentially completing the assembly of the motor rotor, the assembly of the main shaft and the compressor impeller, the assembly of the main shaft and the turbine impeller, the assembly of the main shaft and the motor rotor, the assembly of the shaft sleeve and the motor rotor and the main shaft and the assembly of the nut and the main shaft. The rotating assembly structure has the characteristics of good compactness, high rigidity and the like, the connection strength and the rigidity of the rotating assembly structure of the runoff closed Brayton cycle power generation system can be improved, and the working reliability and the service life of the power generation system are ensured.
The technical scheme of the invention is as follows:
a compact radial-flow turbine thermoelectric conversion system rotating assembly structure comprises a nut, a shaft sleeve, a motor rotor, a main shaft, a compressor impeller and a turbine impeller;
the nut is positioned at one side of the shaft sleeve and matched with the external thread of the main shaft, and the thread screwing direction of the nut is opposite to that of the thermoelectric conversion system when the thermoelectric conversion system works;
the shaft sleeve is provided with an outer cylindrical surface assembled with the radial bearing, the shaft sleeve is provided with an annular end surface assembled with the radial bearing, one end of the shaft sleeve is provided with an inner cylindrical surface assembled with the motor rotor, the other end of the shaft sleeve is provided with a counter bore for placing a nut, and the axial center part of the shaft sleeve is provided with a through hole assembled with the main shaft;
the motor rotor consists of a magnetic core, a long sheath and a short sheath, wherein the magnetic core of the motor rotor is positioned in the long sheath and the short sheath, one side of the motor rotor is provided with a circular boss assembled by a coaxial sleeve, the other side of the motor rotor is provided with an inner cylindrical surface assembled with a main shaft, and the center part of the motor rotor is provided with a through hole assembled with the main shaft;
the main shaft is provided with an outer cylindrical surface assembled with a radial bearing, one end of the main shaft is provided with a round boss assembled with an inner cylindrical surface of a motor rotor, one end of the main shaft, which is close to the round boss, is provided with an optical axis assembled with a motor rotor and a shaft sleeve, the end part of the optical axis, which is close to one end of the round boss, of the main shaft is provided with an external thread assembled with a nut, the other end of the main shaft is provided with an optical axis assembled with a compressor impeller and a turbine impeller, and the end part of the optical axis assembled with the compressor impeller and the turbine impeller of the main shaft is provided with a stud assembled with a threaded hole of the turbine impeller;
the air inlet end of the air compressor impeller is provided with a conical air inlet guide boss, and the center part of the air compressor impeller is provided with a through hole assembled with the main shaft;
the turbine impeller is provided with an inner cylindrical surface assembled with the optical axis of the main shaft, the center part of the back of the turbine impeller is provided with a threaded hole assembled with the main shaft, and the exhaust end of the turbine impeller is provided with a nut for assembly.
A manufacturing process of a rotating assembly structure of a compact radial flow turbine thermoelectric conversion system comprises the following steps:
a. determining dimensional parameters of a rotating assembly of the closed-cycle radial flow turbine thermoelectric conversion system: according to the structural size parameters of a turbine, a compressor and a motor of the closed Brayton cycle thermoelectric conversion system, the sizes of a nut, a shaft sleeve, a motor rotor, a main shaft, a compressor impeller and a turbine impeller are determined;
b. determining the assembly moment of a rotating assembly of a closed-cycle radial-flow turbine thermoelectric conversion system: according to the working state parameters of the closed circulation runoff turbine thermoelectric conversion system, determining the screw thread assembly tightening torque of the rotating assembly of the closed circulation runoff turbine thermoelectric conversion system;
c. and (3) processing a rotating component of the closed circulation runoff turbine thermoelectric conversion system: c, processing a nut, a shaft sleeve, a motor rotor, a main shaft, a compressor impeller and a turbine impeller according to the size parameters of the rotating component of the closed Brayton cycle thermoelectric conversion system determined in the step a;
d. assembling a motor rotor: c, the processed magnetic core, the long sheath and the short sheath of the motor rotor in the step c are assembled together in an interference manner by adopting a mode of heating the long sheath and the short sheath, so that the end faces of the two sides of the magnetic core are respectively tightly attached to the bottom end faces of the long sheath and the short sheath to form the motor rotor;
e. assembling the compressor impeller and the main shaft: the optical axis of the main shaft passes through the through hole of the compressor impeller, so that the end face is tightly attached;
f. assembling the turbine impeller and the main shaft: the optical axis of the main shaft is matched with the inner cylindrical surface of the turbine impeller, the stud of the main shaft is assembled with the threaded hole of the turbine impeller through screwing, and the matched end surfaces are tightly adhered to each other;
g. assembling a motor rotor and a main shaft: the optical axis of the main shaft passes through the through hole of the motor rotor, so that the inner cylindrical surface of the motor rotor is assembled with the circular boss of the main shaft, and the fitting end surface is tightly adhered;
h. the shaft sleeve is assembled with a motor rotor and a main shaft: the optical axis of the main shaft passes through the through hole of the shaft sleeve, so that the inner cylindrical surface of the shaft sleeve is assembled with the circular boss of the motor rotor, and the fitting end surface is tightly adhered;
i. assembling a nut and a main shaft: and d, installing the nut on the external thread of the optical axis of the main shaft according to the screw thread assembly tightening torque determined in the step b, so that the end face of the nut is tightly attached to the bottom of the counter bore of the coaxial sleeve.
The beneficial effects of the invention are as follows:
according to the rotating assembly structure of the compact radial-flow turbine thermoelectric conversion system, the connecting structure that the stud and the threaded hole are adopted between the main shaft and the turbine impeller, and the optical axis and the inner cylindrical surface are assembled is adopted, so that the connection strength of the turbine impeller and the rotating shaft is ensured, good positioning relation between the turbine impeller and the main shaft is realized, and swing is prevented in the working process. The turbine impeller and the main shaft adopt split structures, so that the processing and the assembly of the rotating assembly are facilitated. The conical flow guide boss is arranged at the inlet of the impeller of the air compressor, so that the flow loss and the pneumatic noise at the inlet of the air compressor can be reduced. The shaft sleeve adopts a radial and bearing combined type bearing mode, so that the number of parts formed by the rotating assembly can be reduced, the part structure of the rotating assembly is simplified, and the processing and assembling precision of the rotating assembly is better ensured. The screw thread assembly mode is adopted among the nut, the shaft sleeve, the motor rotor, the main shaft, the compressor impeller and the turbine impeller, so that the assembly of the rotating assembly of the closed circulation runoff turbine thermoelectric conversion system is facilitated, the high compactness of the structure can be realized, and the rigidity and the strength of the rotating assembly are improved.
Drawings
FIG. 1 is a schematic diagram of a rotating assembly of a compact radial flow turbine thermoelectric conversion system according to an embodiment of the present invention.
Fig. 2 is a schematic view of a sleeve according to an embodiment of the present invention.
Fig. 3 is a schematic view of a motor rotor according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a spindle according to an embodiment of the present invention.
Fig. 5 is a schematic view of a compressor wheel according to an embodiment of the present invention.
FIG. 6 is a schematic view of a turbine rotor impeller in accordance with an embodiment of the present invention.
1 nut 2 shaft sleeve 3 motor rotor 4 main shaft 5 compressor impeller 6 turbine impeller
7 sleeve through hole 8 sleeve inner cylindrical surface 9 sleeve annular end surface 10 sleeve counter bore 11 sleeve outer cylindrical surface 12 motor rotor short sheath 13 motor rotor long sheath
14 motor rotor magnetic core 15 motor rotor coaxial sleeve assembled round boss
16 motor rotor and main shaft assembly inner cylindrical surface
External thread of through hole 18 main shaft of 17 motor rotor
Optical axis of 19 main shaft and motor rotor and shaft sleeve assembly
Circular boss 20 main shaft assembled with motor rotor and outer cylindrical surface assembled with radial bearing 21 main shaft
22 spindle stud with optical axis 23 spindle assembled by compressor impeller and turbine impeller
Conical air inlet guide boss of through hole 25 air compressor impeller assembled by 24 air compressor impeller and main shaft
Stud for assembling 26 turbine impeller and inner cylindrical surface 27 compressor impeller of turbine impeller
Screw cap for assembly of 28 turbine wheel
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
A compact radial flow turbine thermoelectric conversion system rotating assembly comprises a nut 1, a shaft sleeve 2, a motor rotor 3, a main shaft 4, a compressor impeller 5 and a turbine impeller 6, as shown in fig. 1;
the nut 1 is positioned at one side of the shaft sleeve and matched with the external thread 18 of the main shaft, and the thread screwing direction of the nut 1 is opposite to that of the thermoelectric conversion system when the thermoelectric conversion system works;
the shaft sleeve 2 is provided with an outer cylindrical surface 11 assembled with a radial bearing, the shaft sleeve 2 is provided with an annular end surface 9 assembled with the radial bearing, one end of the shaft sleeve 2 is provided with an inner cylindrical surface 8 assembled with a motor rotor, the other end of the shaft sleeve 2 is provided with a counter bore 10 for placing a nut, and the axial center part of the shaft sleeve 2 is provided with a through hole 7 assembled with a main shaft, as shown in figure 2;
the motor rotor 3 consists of a magnetic core 14, a long sheath 13 and a short sheath 12, wherein the magnetic core 14 of the motor rotor 3 is positioned in the long sheath 13 and the short sheath 12, one side of the motor rotor 3 is provided with a circular boss 15 assembled by the coaxial sleeve 2, the other side of the motor rotor 3 is provided with an inner cylindrical surface 16 assembled by the main shaft 4, and the center part of the motor rotor 3 is provided with a through hole 17 assembled by the main shaft 4, as shown in figure 3;
the main shaft 4 is provided with an outer cylindrical surface 21 assembled with a radial bearing, one end of the main shaft 4 is provided with a round boss 20 assembled with an inner cylindrical surface of a motor rotor, one end of the main shaft 4 close to the round boss is provided with an optical axis 19 assembled with the motor rotor and a shaft sleeve, the end part of the optical axis of the main shaft 4 close to one end of the round boss is provided with an external thread 18 assembled with a nut, the other end of the main shaft 4 is provided with an optical axis 22 assembled with a compressor impeller and a turbine impeller, and the end part of the optical axis assembled with the compressor impeller and the turbine impeller of the main shaft 4 is provided with a stud 23 assembled with a threaded hole of the turbine impeller, as shown in fig. 4;
the air inlet end of the air compressor impeller 5 is provided with a conical air inlet guide boss 25, and the center part of the air compressor impeller 5 is provided with a through hole 24 assembled with a main shaft, as shown in fig. 5;
the turbine impeller 6 is provided with an inner cylindrical surface 26 assembled with the optical axis of the main shaft, the center part of the back of the turbine impeller 6 is provided with a threaded hole 27 assembled with the main shaft, and the exhaust end of the turbine impeller 6 is provided with a nut 28 for assembly, as shown in fig. 6.
The manufacturing process of the rotating assembly structure of the compact radial flow turbine thermoelectric conversion system comprises the following steps of:
a. determining dimensional parameters of a rotating assembly of the closed-cycle radial flow turbine thermoelectric conversion system: according to the structural size parameters of a turbine, a compressor and a motor of the closed Brayton cycle thermoelectric conversion system, the sizes of a nut 1, a shaft sleeve 2, a motor rotor 3, a main shaft 4, a compressor impeller 5 and a turbine impeller 6 are determined;
b. determining the assembly moment of a rotating assembly of a closed-cycle radial-flow turbine thermoelectric conversion system: according to the working state parameters of the closed circulation runoff turbine thermoelectric conversion system, determining the screw thread assembly tightening torque of the rotating assembly of the closed circulation runoff turbine thermoelectric conversion system;
c. and (3) processing a rotating component of the closed circulation runoff turbine thermoelectric conversion system: machining a nut 1, a shaft sleeve 2, a motor rotor 3, a main shaft 4, a compressor impeller 5 and a turbine impeller 6 according to the size parameters of the rotating component of the closed Brayton cycle thermoelectric conversion system determined in the step a;
d. assembling of the motor rotor 3: c, the processed motor rotor magnetic core 14, the long sheath 13 and the short sheath 12 in the step c are assembled together by interference by adopting a mode of heating the long sheath 13 and the short sheath 12, so that the end faces of the two sides of the magnetic core 14 are respectively tightly attached to the bottom end faces of the long sheath 13 and the short sheath 12 to form the motor rotor 3;
e. assembling the compressor impeller 5 and the main shaft 4: the optical axis 22 of the main shaft 4 passes through the through hole 24 of the compressor impeller 5, so that the end face is tightly attached;
f. assembly of the turbine wheel 6 with the main shaft 4: the optical axis 22 of the main shaft 4 is matched with the inner cylindrical surface 26 of the turbine impeller 6, the stud 23 of the main shaft 4 is assembled with the threaded hole 27 of the turbine impeller 6 through screwing, and the matched end surfaces are tightly adhered to each other;
g. assembly of the motor rotor 3 with the spindle 4: an optical axis 19 of the main shaft 4 passes through a through hole 17 of the motor rotor 3, so that an inner cylindrical surface 16 of the motor rotor 3 is assembled with a circular boss 20 of the main shaft 4, and the fitting end surface is tightly adhered;
h. assembly of the sleeve 2 with the motor rotor 3 and the spindle 4: an optical axis 19 of the main shaft 4 passes through the through hole 7 of the shaft sleeve 2, so that the inner cylindrical surface 8 of the shaft sleeve 2 is assembled with the circular boss 15 of the motor rotor 3, and the fitting end surface is tightly adhered;
i. assembly of the nut 1 with the spindle 4: according to the screw assembly tightening torque determined in the step b, the nut 1 is installed on the external screw thread 18 of the optical axis of the main shaft 4, so that the end surface of the nut 1 is tightly attached to the bottom of the counter bore 10 of the shaft sleeve 2.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (3)

1. A compact radial flow turbine thermoelectric conversion system rotating assembly structure, characterized in that: comprises a nut (1), a shaft sleeve (2), a motor rotor (3), a main shaft (4), a compressor impeller (5) and a turbine impeller (6);
the nut (1) is positioned at one side of the shaft sleeve and matched with the external thread (18) of the main shaft, and the thread rotation direction of the nut (1) is opposite to the rotation direction of the thermoelectric conversion system during working;
the motor rotor is characterized in that an outer cylindrical surface (11) assembled with a radial bearing is arranged on the shaft sleeve (2), an annular end surface (9) assembled with the radial bearing is arranged on the shaft sleeve (2), an inner cylindrical surface (8) assembled with a motor rotor is arranged at one end of the shaft sleeve (2), a counter bore (10) for placing a nut is arranged at the other end of the shaft sleeve (2), and a through hole (7) assembled with a main shaft is arranged at the axial center part of the shaft sleeve (2);
the motor rotor (3) consists of a magnetic core (14), a long sheath (13) and a short sheath (12), wherein the magnetic core (14) of the motor rotor (3) is positioned in the long sheath (13) and the short sheath (12), one side of the motor rotor (3) is provided with a circular boss (15) assembled by the coaxial sleeve (2), the other side of the motor rotor (3) is provided with an inner cylindrical surface (16) assembled by the main shaft (4), and the center part of the motor rotor (3) is provided with a through hole (17) assembled by the main shaft (4);
the novel radial bearing type spindle comprises a spindle (4), wherein an outer cylindrical surface (21) assembled with a radial bearing is arranged on the spindle (4), a circular boss (20) assembled with an inner cylindrical surface of a motor rotor is arranged at one end of the spindle (4), an optical axis (19) assembled with the motor rotor and a shaft sleeve is arranged at one end, close to the circular boss, of the spindle (4), an external thread (18) assembled with a nut is arranged at the optical axis end, close to one end of the circular boss, of the spindle (4), an optical axis (22) assembled with a compressor impeller and a turbine impeller is arranged at the other end of the spindle (4), and a stud (23) assembled with a threaded hole of the turbine impeller is arranged at the end of the optical axis assembled with the compressor impeller and the turbine impeller;
the air inlet end of the air compressor impeller (5) is provided with a conical air inlet guide boss (25), and the center part of the air compressor impeller (5) is provided with a through hole (24) assembled with the main shaft;
the turbine impeller (6) is provided with an inner cylindrical surface (26) assembled with the optical axis of the main shaft, the center part of the back of the turbine impeller (6) is provided with a threaded hole (27) assembled with the main shaft, and the exhaust end of the turbine impeller (6) is provided with a nut (28) for assembly.
2. A process for manufacturing a rotating assembly structure for a compact radial flow turbine thermoelectric conversion system as recited in claim 1, wherein: the method comprises the following steps:
a. determining a dimensional parameter of a rotating assembly of the closed circulation runoff turbine thermoelectric conversion system;
b. determining an assembly moment of a rotating assembly of the closed circulation runoff turbine thermoelectric conversion system;
c. processing a rotating component of the closed circulation runoff turbine thermoelectric conversion system;
d. assembling of the motor rotor (3): c, the processed motor rotor magnetic core (14), the long sheath (13) and the short sheath (12) in the step c are assembled together by interference by adopting a mode of heating the long sheath (13) and the short sheath (12), so that the two side end faces of the magnetic core (14) are respectively tightly attached to the bottom end faces of the long sheath (13) and the short sheath (12) to form the motor rotor (3);
e. assembling the compressor impeller (5) and the main shaft (4): an optical axis (22) of the main shaft (4) passes through a through hole (24) of the compressor impeller (5) to ensure that the end face is tightly attached;
f. assembling the turbine impeller (6) and the main shaft (4);
g. assembling the motor rotor (3) and the main shaft (4);
h. the shaft sleeve (2) is assembled with the motor rotor (3) and the main shaft (4);
i. and assembling the nut (1) and the main shaft (4).
3. A process for manufacturing a rotating assembly structure for a compact radial flow turbine thermoelectric conversion system as recited in claim 2, wherein: in step f, the optical axis (22) of the main shaft (4) is matched with the inner cylindrical surface (26) of the turbine impeller (6), the stud (23) of the main shaft (4) is assembled with the threaded hole (27) of the turbine impeller (6) through screwing, and the matched end surfaces are ensured to be mutually adhered.
CN202011154650.3A 2020-10-26 2020-10-26 Rotating assembly of compact radial-flow turbine thermoelectric conversion system Active CN112360573B (en)

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JP4112468B2 (en) * 2003-10-02 2008-07-02 本田技研工業株式会社 Axis of rotation
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CN203925595U (en) * 2014-06-24 2014-11-05 浙江荣发动力有限公司 The linkage structure of a kind of turbine shaft and impeller
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