CN114810663B - Rear force bearing structure of centrifugal/oblique flow compressor - Google Patents
Rear force bearing structure of centrifugal/oblique flow compressor Download PDFInfo
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- CN114810663B CN114810663B CN202210424191.9A CN202210424191A CN114810663B CN 114810663 B CN114810663 B CN 114810663B CN 202210424191 A CN202210424191 A CN 202210424191A CN 114810663 B CN114810663 B CN 114810663B
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- casing
- diffuser
- flow
- inner ring
- diffuser casing
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
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- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
Abstract
The invention discloses a centrifugal/oblique flow compressor rear bearing structure, which relates to the field of aeroengines and gas turbine structures and mainly comprises a flow divider casing and a diffuser casing, wherein diffuser blades and a flow divider casing support plate are fully utilized to transmit the load of the compressor rear bearing to an engine mounting joint through an axial diffuser-flow divider casing, and a diffuser C-shaped inner ring is ingeniously designed to improve the axial rigidity, effectively reduce the axial deformation, ensure the radial rigidity requirement of a rigid support and improve the stability of a rotor-support system.
Description
Technical Field
The invention relates to the field of structures of aeroengines and gas turbines, in particular to a force-bearing casing structure, and particularly relates to a rear force-bearing structure of a centrifugal/oblique flow compressor.
Background
On the prior light single-rotor aeroengine, a centrifugal or oblique flow impeller is adopted for a gas compressor, and when a pivot is designed between the gas compressor and a turbine, a bearing frame is generally designed at a casing of a diffuser of the gas compressor because the temperature behind the gas compressor is lower than that of the turbine. The axial distance of an inner ring of the diffuser is limited by the position of the rear support of the gas compressor, so that the axial rigidity is weak, and the axial deformation coordination of the rotor and the stator cannot be met. In order to shorten a force transmission path as much as possible and improve the reliability of force transmission, a better force bearing frame structure needs to be provided under the condition of not obviously changing the rigidity and deformation of a support.
Disclosure of Invention
Technical problem to be solved
Aiming at the technical defects in the prior art, the invention provides a centrifugal/oblique flow compressor rear bearing structure, which makes full use of diffuser blades and a splitter box support plate, transfers the load of the compressor rear bearing to an engine mounting joint through an axial diffuser-splitter box, skillfully designs a diffuser C-shaped inner ring, improves the axial rigidity, effectively reduces the axial deformation, can ensure the radial rigidity requirement of a rigid support, and improves the stability of a rotor-support system. When the rear bearing frame structure of the centrifugal compressor is adopted, the structure is compact, the stress concentration is small, and the structure is very suitable for batch production due to the simple structure, so that the mounting, the maintenance and the replacement are convenient, and the rear bearing frame structure has wide application prospect on aero-engines and gas turbines.
(II) technical scheme
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rear bearing structure of a centrifugal/oblique flow compressor comprises a flow dividing casing and a diffuser casing, wherein the flow dividing casing is arranged at the downstream of a fan casing, the diffuser casing is arranged at the downstream of the flow dividing casing,
the flow splitting case comprises a flow splitting case outer ring, a flow splitting case inner ring and a plurality of flow guide support plates which are uniformly distributed between the flow splitting case outer ring and the flow splitting case inner ring along the circumferential direction, the flow splitting case outer ring, the flow splitting case inner ring and the flow guide support plates are all arranged in an inclined manner with included angles with the axis of the compressor, wherein the front end face of the flow splitting case outer ring is machined to form a flow splitting case front mounting edge, the flow splitting case front mounting edge is coaxially and fixedly connected with an upstream fan case through a fastener, and a compressor mounting section mounting edge is machined and formed on the outer wall face of the rear end of the flow splitting case outer ring; the rear end face of the inner ring of the flow splitting casing is processed into a rear mounting edge of the flow splitting casing, and the rear mounting edge of the flow splitting casing is coaxially and fixedly connected with a downstream diffuser casing;
the diffuser casing is an axial diffuser and comprises a diffuser casing outer ring, a diffuser casing inner ring and a plurality of diffuser blades which are uniformly distributed between the diffuser casing outer ring and the diffuser casing inner ring along the circumferential direction, wherein the diffuser casing outer ring, the diffuser casing inner ring and the diffuser blades extend along the axial direction of the compressor, the front end face of the diffuser casing outer ring is processed to form a diffuser casing front mounting edge, and the diffuser casing front mounting edge is coaxially and fixedly connected with the splitter casing rear mounting edge through a fastener; the diffuser casing inner ring is characterized in that the radial inner end of the diffuser casing inner ring is processed to form a diffuser casing lower mounting edge, the diffuser casing lower mounting edge is fixedly connected with a compressor rear bearing seat, the cross section of the diffuser casing inner ring is integrally C-shaped, the axial rigidity of the diffuser casing serving as a bearing casing is increased, the axial deformation of the bearing casing is reduced, and the incongruity of the axial deformation of a rotor and a stator is improved.
In a further embodiment, a plurality of mounting holes and jackscrew holes are circumferentially arranged on the front mounting edge of the splitter box, the splitter box is tightly connected with the upstream fan box through bolts, and coaxial positioning is realized through the matching of the seam allowances, and the seam allowances are in transition matching.
In a further embodiment, a plurality of mounting holes and jackscrew holes are arranged on the rear mounting edge of the flow divider casing along the circumferential direction, the flow divider casing is connected with the diffuser casing through bolts, coaxial positioning is realized through the matching of a spigot, and the spigot is in interference fit.
In a further embodiment, the flow divider casing inner ring is a hollow structure.
In a further embodiment, the flow divider casing and the diffuser casing are both made of stainless steel.
In a further embodiment, the thickness and the camber of the C-shaped inner ring of the diffuser casing need to be optimally adjusted according to the strength design result.
Through the structure arrangement, the load of the centrifugal/oblique flow compressor rear bearing structure is transferred to the engine mounting joint through the axial diffuser-flow splitting casing, so that the force transfer route is shortened, and the force transfer reliability is improved. The cross section of the inner ring of the diffuser casing is C-shaped, so that the axial rigidity of the inner ring of the diffuser is improved, the axial deformation is effectively reduced, and the requirement on the radial rigidity of a rigid support can be met. The rigidity of the diffuser casing is adjusted by changing the thickness and the curvature of the C-shaped inner ring of the diffuser casing, so that the optimal axial rigidity and the optimal radial rigidity are realized.
(III) advantageous effects
Compared with the prior art, the rear bearing structure of the centrifugal/oblique flow compressor has at least the following remarkable technical effects:
(1) The load of the rear support of the compressor is transferred to the mounting joint of the engine through the axial diffuser-flow splitting casing, so that the force transfer route is shortened, and the reliability of force transfer is improved.
(2) The cross section of the inner ring of the diffuser is arranged to be C-shaped, so that the axial rigidity of the inner ring of the diffuser is improved, the axial deformation is effectively reduced, and the requirement on the radial rigidity of a rigid support can be met.
(3) The rigidity of the diffuser casing is adjusted by changing the thickness and the curvature of the C-shaped inner ring of the diffuser casing, so that the optimal axial rigidity and the optimal radial rigidity are realized.
Drawings
FIG. 1 is a schematic diagram of a rear force-bearing structure of a centrifugal/diagonal flow compressor according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the change of the thickness and camber of the inner ring of the diffuser according to an embodiment of the present invention.
Description of reference numerals:
the flow divider comprises a flow divider casing 1, a diffuser casing 2, a flow divider casing front mounting edge 3, a flow divider support plate 4, a mounting section mounting edge 5, a flow divider casing rear mounting edge 6, a diffuser blade 7 and a diffuser casing lower mounting edge 8.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to one embodiment of the invention, the main structure of the rear bearing structure of the centrifugal/oblique flow compressor is shown in figure 1. The rear bearing structure of the centrifugal/oblique flow compressor comprises a flow dividing casing 1 and a diffuser casing 2, wherein the flow dividing casing 1 is arranged at the downstream of the fan casing in an adjacent mode, and the diffuser casing 2 is arranged at the downstream of the flow dividing casing 1 in an adjacent mode.
The flow splitting case 1 comprises a concentrically arranged flow splitting case outer ring, a flow splitting case inner ring and a plurality of flow guide support plates 4 which are uniformly distributed between the flow splitting case outer ring and the flow splitting case inner ring along the circumferential direction, the flow splitting case outer ring, the flow splitting case inner ring and the flow guide support plates 4 are all obliquely arranged with included angles with the axis of a gas compressor, wherein the front end face of the flow splitting case outer ring is processed to form a flow splitting case front mounting edge 3, the flow splitting case front mounting edge 3 is coaxially and fixedly connected with an upstream fan case through a fastener, and a gas compressor mounting section mounting edge 5 is processed and formed on the outer wall face of the rear end of the flow splitting case outer ring; the rear end face of the inner ring of the flow divider casing is processed into a rear mounting edge 6 of the flow divider casing, and the rear mounting edge 6 of the flow divider casing is coaxially and fixedly connected with the downstream diffuser casing 2.
The diffuser casing 2 is an axial diffuser and comprises a diffuser casing outer ring, a diffuser casing inner ring and a plurality of diffuser blades 7 which are uniformly distributed between the diffuser casing outer ring and the diffuser casing inner ring along the circumferential direction, wherein the diffuser casing outer ring, the diffuser casing inner ring and the diffuser blades 7 extend along the axial direction of the compressor, the front end face of the diffuser casing outer ring is processed to form a diffuser casing front mounting edge, and the diffuser casing front mounting edge is coaxially and fixedly connected with a splitter casing rear mounting edge 6 through a fastener; the radial inner end of the inner ring of the diffuser casing is processed to form a lower mounting edge 8 of the diffuser casing, the lower mounting edge 8 of the diffuser casing is fixedly connected with a rear bearing seat of the compressor, and the cross section of the inner ring of the diffuser casing is integrally C-shaped, so that the axial rigidity of the diffuser casing serving as a bearing casing is increased, the axial deformation of the bearing casing is reduced, and the incongruity of the axial deformation of the rotor and the stator is improved.
Through the structure arrangement, the load of the centrifugal/oblique flow compressor rear bearing structure is transferred to the engine mounting joint through the axial diffuser-flow splitting casing, so that the force transfer route is shortened, and the force transfer reliability is improved. The cross section of the inner ring of the diffuser casing is C-shaped, so that the axial rigidity of the inner ring of the diffuser is improved, the axial deformation is effectively reduced, and the requirement on the radial rigidity of the rigid support can be met. The rigidity of the diffuser casing is adjusted by changing the thickness and the curvature of the C-shaped inner ring of the diffuser casing, so that the optimal axial rigidity and the optimal radial rigidity are realized.
Specifically, as shown in fig. 1, the front end surface of the flow splitting casing 1 is processed to form a flow splitting casing front mounting edge 3, and the flow splitting casing front mounting edge 3 is disposed on the front end surface of the flow splitting casing outer ring and is fastened and connected to the upstream fan casing. A plurality of mounting holes and jackscrew holes are arranged on the front mounting edge 3 of the flow distribution casing along the circumferential direction, the flow distribution casing is connected with an upstream fan casing through bolts, coaxial positioning is realized through seam allowance matching, and the seam allowance is in transition matching. A plurality of flow guide support plates 4 are uniformly distributed between the outer ring of the flow distribution casing and the inner ring of the flow distribution casing along the circumferential direction; the mounting section mounting edge 5 is arranged on the outer wall surface at the rear end of the outer ring of the flow dividing casing; the rear mounting edge 6 of the flow divider casing is arranged on the rear end surface of the inner ring of the flow divider casing and is connected with the downstream diffuser casing 2. A plurality of mounting holes and jackscrew holes are arranged on the rear mounting edge 6 of the flow divider casing along the circumferential direction, the flow divider casing is connected with the diffuser casing 2 through bolts, coaxial positioning is realized through the matching of the spigot, and the spigot is in interference fit. The inner ring of the flow distribution casing is of a hollow structure.
As shown in fig. 1, the cross section of the diffuser casing 2 is C-shaped, and a plurality of axial diffuser blades 7 are uniformly distributed between the outer ring and the inner ring of the diffuser casing along the circumferential direction and fixedly connected with the rear bearing seat of the compressor through the lower mounting edge 8 of the diffuser casing. The diffuser casing 2 is provided with the C-shaped inner ring, so that the axial rigidity of the diffuser casing as a bearing casing is increased, the axial deformation of the bearing casing is reduced, and the discordance of the axial deformation of the rotor and the stator is improved.
As shown in FIG. 2, the axial rigidity and the radial rigidity of the bearing structure are adjusted by changing the thickness and the bending degree of the C-shaped inner ring of the diffuser casing 2. The diffuser casing inner ring designed in the embodiment of the invention has the deformation difference of less than 0.3mm at the key positions of the rotor and the stator of the engine and the radial rigidity of more than 1 multiplied by 108N/m, meets the design requirement.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the invention which are described in the patent conception of the invention are included in the protection scope of the patent of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art.
Claims (6)
1. A rear bearing structure of a centrifugal/oblique flow compressor comprises a flow dividing casing and a diffuser casing, wherein the flow dividing casing is arranged at the downstream of a fan casing, the diffuser casing is arranged at the downstream of the flow dividing casing,
the flow splitting case comprises a flow splitting case outer ring, a flow splitting case inner ring and a plurality of flow guide support plates which are uniformly distributed between the flow splitting case outer ring and the flow splitting case inner ring along the circumferential direction, the flow splitting case outer ring, the flow splitting case inner ring and the flow guide support plates are all arranged in an inclined manner with included angles with the axis of the compressor, wherein the front end face of the flow splitting case outer ring is machined to form a flow splitting case front mounting edge, the flow splitting case front mounting edge is coaxially and fixedly connected with an upstream fan case through a fastener, and a compressor mounting section mounting edge is machined and formed on the outer wall face of the rear end of the flow splitting case outer ring; the rear end face of the inner ring of the flow splitting casing is processed into a rear mounting edge of the flow splitting casing, and the rear mounting edge of the flow splitting casing is coaxially and fixedly connected with a downstream diffuser casing;
the diffuser casing is an axial diffuser and comprises a diffuser casing outer ring, a diffuser casing inner ring and a plurality of diffuser blades which are uniformly distributed between the diffuser casing outer ring and the diffuser casing inner ring along the circumferential direction, wherein the diffuser casing outer ring, the diffuser casing inner ring and the diffuser blades extend along the axial direction of the compressor, the front end face of the diffuser casing outer ring is processed to form a diffuser casing front mounting edge, and the diffuser casing front mounting edge is coaxially and fixedly connected with the splitter casing rear mounting edge through a fastener; the diffuser casing inner ring is characterized in that the radial inner end of the diffuser casing inner ring is processed to form a diffuser casing lower mounting edge, the diffuser casing lower mounting edge is fixedly connected with a compressor rear bearing seat, the cross section of the diffuser casing inner ring is integrally C-shaped, the axial rigidity of the diffuser casing serving as a bearing casing is increased, the axial deformation of the bearing casing is reduced, and the incongruity of the axial deformation of a rotor and a stator is improved.
2. The centrifugal/diagonal flow compressor rear bearing structure according to claim 1, characterized in that: a plurality of mounting holes and jackscrew holes are arranged on the front mounting edge of the flow distribution casing along the circumferential direction, are fixedly connected with the upstream fan casing through bolts and are coaxially positioned through seam allowance matching, and the seam allowance is in transition matching.
3. The centrifugal/diagonal flow compressor rear bearing structure according to claim 1, characterized in that: a plurality of mounting holes and jackscrew holes are arranged on the rear mounting edge of the flow distribution casing along the circumferential direction, the flow distribution casing is connected with the diffuser casing through bolts, coaxial positioning is realized through the matching of the spigot, and the spigot is in interference fit.
4. The centrifugal/diagonal flow compressor back bearing structure of claim 1, wherein: the inner ring of the flow distribution casing is of a hollow structure.
5. The compressor rear force-bearing structure of claim 1, characterized in that: the flow dividing casing and the diffuser casing are made of stainless steel materials.
6. The centrifugal/diagonal flow compressor rear bearing structure according to any one of claims 1 to 5, characterized in that: the thickness and the camber of the C-shaped inner ring of the diffuser casing need to be optimized and adjusted according to the strength design result.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210424191.9A CN114810663B (en) | 2022-04-21 | 2022-04-21 | Rear force bearing structure of centrifugal/oblique flow compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210424191.9A CN114810663B (en) | 2022-04-21 | 2022-04-21 | Rear force bearing structure of centrifugal/oblique flow compressor |
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| CN114810663A CN114810663A (en) | 2022-07-29 |
| CN114810663B true CN114810663B (en) | 2022-11-01 |
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| CN115288804B (en) * | 2022-10-10 | 2023-03-24 | 中国航发四川燃气涡轮研究院 | Bird skeleton bionic force-bearing structure and design method thereof |
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2022
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