CN111608748A - Squirrel-cage elastic support - Google Patents
Squirrel-cage elastic support Download PDFInfo
- Publication number
- CN111608748A CN111608748A CN202010473292.6A CN202010473292A CN111608748A CN 111608748 A CN111608748 A CN 111608748A CN 202010473292 A CN202010473292 A CN 202010473292A CN 111608748 A CN111608748 A CN 111608748A
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- CN
- China
- Prior art keywords
- axial force
- elastic support
- squirrel
- cage
- fixedly connected
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Classifications
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
- F01D25/285—Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures
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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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention provides a squirrel-cage elastic support, comprising: the cylindrical bearing mounting ring is provided with a plurality of through grooves on the wall, and a plurality of uniformly distributed cage bars are correspondingly formed; the axial force testing part is fixedly connected with the cylindrical bearing mounting ring; and the fixing ring is fixedly connected with the axial force testing part and is provided with a plurality of positioning holes. The squirrel-cage elastic support has a compact structure, can directly measure the axial force of a rotor system on the elastic support, omits a force measuring ring, reduces the risk of the system, and solves the problem that the axial force in the bearing integrating the elastic support and the bearing is difficult to directly test.
Description
Technical Field
The invention relates to the field of engines, in particular to a squirrel-cage elastic support.
Background
The squirrel-cage elastic support is adopted to support the rotor system and is widely applied to aircraft engines, and in modern aircraft engines, the axial force condition of the rotor system needs to be monitored at any time to ensure that the bearing works in a normal axial force range.
The existing axial force test mainly comprises two realization paths, one is indirect measurement, namely the axial force applied to a rotor system is obtained through pneumatic load calculation, more pneumatic parameter measuring points are required to be arranged in an engine, and certain errors exist; the other is direct measurement, the most used method at present is stress ring measurement, the method has high precision, but in the bearing with the elastic support and the bearing integrated, the testing method fails, and no effective direct axial force testing method is disclosed at home at present.
It is noted that the information disclosed in the foregoing background section is only for enhancement of background understanding of the invention and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a squirrel-cage elastic support for testing the axial force of a spring-supported integrated bearing.
In order to achieve the purpose, the invention adopts the following scheme:
a squirrel cage elastomeric support comprising:
the cylindrical bearing mounting ring is provided with a plurality of through grooves on the wall, and a plurality of uniformly distributed cage bars are correspondingly formed;
the axial force testing part is fixedly connected with the cylindrical bearing mounting ring; and
and the fixing ring is fixedly connected with the axial force testing part and is provided with a plurality of positioning holes.
In some embodiments, the axial force test portion includes a horizontal connection portion and an inclined connection portion fixedly connected to the horizontal connection portion.
In some embodiments, the horizontal connecting portion is fixedly connected to the cylindrical bearing mounting ring.
In some embodiments, the angled connection is fixedly connected to the retaining ring.
In some embodiments, the outer side of the horizontal connection has a radial projection.
In some embodiments, the inner side of the inclined connection portion is a slope.
In some embodiments, a strain gauge is affixed to the ramp.
In some embodiments, the height of the inclined plane is 5-20 mm, the thickness is 1-5 mm, and the included angle between the inclined plane and the vertical direction is 30-60 degrees.
In some embodiments, the axial force testing part is a U-shaped structure, and a strain testing device is adhered to the bottom of the U-shaped structure.
In some embodiments, the cylindrical bearing mounting ring, the axial force testing portion, and the retaining ring are an integrally formed structure.
The squirrel-cage elastic support has a compact structure, can directly measure the axial force of a rotor system on the elastic support, omits a force measuring ring, reduces the risk of the system, and solves the problem that the axial force in the bearing integrating the elastic support and the bearing is difficult to directly test.
Drawings
FIG. 1 is a cross-sectional view of a squirrel cage elastomeric support according to one embodiment of the present invention;
fig. 2 and 3 are schematic perspective views of the squirrel cage elastic support of the present invention;
FIG. 4 is a partial schematic view of the axial force testing portion of the squirrel cage elastomeric bearing shown in FIG. 1;
FIG. 5 is a cross-sectional view of another embodiment of the squirrel cage elastomeric support of the present invention;
fig. 6 is a partial schematic view of the axial force testing portion of the squirrel cage elastic support shown in fig. 5.
Wherein the reference numerals are as follows:
1: cylindrical bearing mounting ring
11: bearing mounting area
12: zone of stiffness modulation
2: axial force test section
21: horizontal joint
22: inclined connecting part
23: radial projection
24: inclined plane
3: fixing ring
t: thickness of
L: height
α: included angle
s: length of
b: height
Detailed Description
The technical solution of the present invention is further explained below according to specific embodiments. The scope of protection of the invention is not limited to the following examples, which are set forth for illustrative purposes only and are not intended to limit the invention in any way.
All features disclosed in this invention may be combined in any combination and such combinations are understood to be disclosed or described herein unless a person skilled in the art would consider such combinations to be clearly unreasonable. The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Fig. 1 is a sectional view of a squirrel cage elastic support according to an embodiment of the present invention, and fig. 2 and 3 are schematic perspective views of the squirrel cage elastic support according to the present invention, and as shown in fig. 1 to 3, the squirrel cage elastic support includes a cylindrical bearing mounting ring 1, an axial force testing part 2, and a fixing ring 3.
The cylindrical bearing mounting ring 1 is of a hollow cylindrical structure and comprises a bearing mounting area 11 and a rigidity adjusting area 12, wherein the bearing mounting area 11 is located on the outermost side and used for being connected with a bearing outer ring or integrated with the bearing outer ring, the rigidity adjusting area 12 is of a hollow structure, a plurality of through grooves are formed in the wall of the cylindrical bearing mounting ring and correspond to a plurality of uniformly distributed cage bars, the critical rotating speed of a rotor can be effectively adjusted, shock absorption is achieved, and meanwhile the rigidity of the elastic support can be adjusted through the geometric parameters and the number of the cage bars.
The axial force testing part 2 is an annular structure, and is fixedly connected with the rigidity adjusting area 12 of the cylindrical bearing mounting ring 1 and is adhered with a strain testing device such as a strain gauge or a grating strain sensor and the like so as to be used for measuring the axial force of the engine rotor system.
The fixing ring 3 is used as a connecting part of the elastic support and the casing, is fixedly connected with the axial force testing part 2 and is provided with a plurality of positioning holes, the fixing ring 3 is shaped by adopting a spigot, and bolt connection is realized through the plurality of positioning holes.
Normally, the elastic support is fixed to the casing by means of a bolted connection, and the outer ring of the bearing transmits the axial forces and radial fluctuations of the rotor to the elastic support. In order to measure the axial force on the elastic support more accurately, the radial force and the axial force on the elastic support need to be separated, and the deformation caused by the axial force is increased.
Fig. 4 is a partial schematic view of the axial force testing part of the squirrel cage elastic support shown in fig. 1, and as shown in fig. 4, the axial force testing part 2 includes a horizontal connecting part 21 and an inclined connecting part 22 fixedly connected with the horizontal connecting part 21, the horizontal connecting part 21 is fixedly connected with the cylindrical bearing mounting ring 1, and the inclined connecting part 22 is fixedly connected with the fixing ring 3, thereby connecting the cylindrical bearing mounting ring 1, the axial force testing part 2 and the fixing ring 3 together.
The horizontal connecting portion 21 is generally cylindrical, parallel to the elastically supported cylinder wall, and has on its outside a highly accurate radial projection 23, the radial projection 23 engaging with the casing with a minimum clearance, where it transmits the radial forces to the casing, while allowing the axial forces to continue to be transmitted.
The inclined connecting portion 22 connects the horizontal connecting portion 21 and the fixing ring 3, and since the fixing ring 3 is perpendicular to the cylinder wall of the elastic support and is not in the same plane as the horizontal connecting portion 21, the inclined connecting portion 22 and the fixing ring 3 have a certain included angle, so as to form an inclined surface 24 on the inner side wall of the inclined connecting portion 22, and a strain testing device such as a strain gauge is adhered to the inclined surface 24.
As shown in FIG. 4, the height L from the top to the bottom of the inclined surface 24 is 5-20 mm, the thickness t at the thinnest part is 1-5 mm, and the included angle alpha between the inclined surface 24 and the fixing ring 3 is 30-60 degrees.
Under the same axial force, the 3 parameters are adjusted, different dependent variables can be realized at the position where the strain gauge is attached, and the 3 parameters can be adjusted according to the sensitivity requirements of an engine rotor system and an axial force testing system so as to achieve the best axial force testing effect. For example, the strain testing device is placed at the position where the strain on the surface of the inclined plane is maximum, and the strain of the elastic support at the patch under the same axial force can be adjusted by adjusting t and L. the smaller t is, the larger L is, the larger the strain response at the patch is, in order to improve the testing precision, the strain at the patch is required to be as large as possible, and the selection values of t and L are mainly limited by the assembling space, the strength of the elastic support and the service life. After t and L are selected, it is possible that the optimum patch position is too close to the upper end of the ramp, at which point a can be adjusted, thereby adjusting the patch position to a position somewhere in the middle of the ramp with some effect on the strain value.
Fig. 5 is a sectional view of a squirrel cage elastic support according to another embodiment of the present invention, and fig. 6 is a partial schematic view of an axial force testing part of the squirrel cage elastic support shown in fig. 5, and as shown in fig. 5 and 6, the squirrel cage elastic support of this embodiment is different from the structure shown in fig. 1 in that the axial force testing part has a U-shaped structure, and the U-shaped structure has a first arm and a second arm, wherein a side end of the first arm is fixedly connected with a stiffness adjusting region of a cylindrical bearing mounting ring, a top end of the second arm is connected with a fixing ring, and a strain gauge or other strain testing device is attached to a bottom of the U-shaped structure.
The length of the bottom of the U-shaped structure is s, the thickness of the bottom of the U-shaped structure is t, a concave part is arranged on the outer side of the first support arm to be matched with the rigidity adjusting area, the height of the concave part is b, the outer side of the second support arm is an inclined plane, the length of the inclined plane is L, and the included angle between the inclined plane and the fixing ring is alpha.
Usually, the strain testing device is placed at the position with the maximum strain at the bottom of the U-shaped structure, and the strain of the elastic support at the patch under the same axial force can be adjusted by adjusting t and b. the smaller t is, the larger b is, the larger the strain response at the patch is, in order to improve the testing precision, the strain at the patch is required to be as large as possible, and the selection values of t and b are mainly limited by the assembling space, the strength of the elastic support and the service life. After t and b are selected, it is possible that the optimal patch position is too close to the right end of the bottom of the U-shaped structure, where L and α can be adjusted to adjust the patch position to somewhere in the middle of the bottom of the U-shaped structure.
Under the same axial force, the strain distribution of the patch position of the U-shaped structure shown in fig. 6 is more uniform, and a larger strain increment can be obtained at the patch position through fine adjustment of b and t, so that the test result of the axial force is more accurate.
In the squirrel-cage elastic support, the cylindrical bearing mounting ring, the axial force testing part and the fixing ring can be of an integrally formed structure so as to have a more stable connection relationship and reduce the influence of the connection part between the cylindrical bearing mounting ring and the axial force testing part on the axial force testing.
The squirrel-cage elastic support can be directly used for the axial force test of the integration of the elastic support and the bearing, and the influence of the vibration of the rotor on the axial force test is greatly avoided.
The squirrel-cage elastic support of the invention is verified by simulation, and the result shows that: on the premise of meeting the requirement of the rigidity of the elastic support, when a small axial force acts, the elastic support can generate enough strain at the position where the elastic support is attached to the strain gauge, so that the requirement of a system for measuring the axial force by the strain gauge is met, and the axial force measurement can be realized.
In conclusion, the squirrel-cage elastic support has a compact structure, can directly measure the axial force of a rotor system on the elastic support, omits a force measuring ring, reduces the risk of the system, and solves the problem that the axial force in the bearing integrating the elastic support and the bearing is difficult to directly test.
It should be noted by those skilled in the art that the described embodiments of the present invention are merely exemplary and that various other substitutions, alterations, and modifications may be made within the scope of the present invention. Accordingly, the present invention is not limited to the above-described embodiments, but is only limited by the claims.
Claims (10)
1. A squirrel-cage elastic support is characterized by comprising
The cylindrical bearing mounting ring is provided with a plurality of through grooves on the wall, and a plurality of uniformly distributed cage bars are correspondingly formed;
the axial force testing part is fixedly connected with the cylindrical bearing mounting ring; and
and the fixing ring is fixedly connected with the axial force testing part and is provided with a plurality of positioning holes.
2. The squirrel cage resilient support of claim 1, wherein the axial force testing section includes a horizontal connecting portion and an angled connecting portion fixedly connected to the horizontal connecting portion.
3. The squirrel cage elastomeric support of claim 2, wherein the horizontal connecting portion is fixedly connected to the cylindrical bearing mounting ring.
4. The squirrel cage elastomeric support of claim 2, wherein the angled connection is fixedly connected to the retaining ring.
5. The squirrel cage elastomeric support of claim 2, wherein the outer side of the horizontal connecting portion has a radial projection.
6. The squirrel cage resilient support of claim 2, wherein the inner side of the angled connection is a ramp.
7. The squirrel cage resilient support of claim 6, wherein strain gauges are affixed to the inclined surfaces.
8. The squirrel-cage elastic support of claim 6, wherein the height of the inclined plane is 5-20 mm, the thickness of the inclined plane is 1-5 mm, and the included angle between the inclined plane and the vertical direction is 30-60 degrees.
9. The squirrel cage resilient support of claim 1, wherein the axial force testing portion is a U-shaped structure with a strain testing device affixed to a bottom of the U-shaped structure.
10. The squirrel cage resilient support of any one of claims 1 to 9, wherein the cylindrical bearing mounting ring, the axial force testing portion, and the retaining ring are an integrally formed structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010473292.6A CN111608748B (en) | 2020-05-29 | 2020-05-29 | Squirrel-cage elastic support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010473292.6A CN111608748B (en) | 2020-05-29 | 2020-05-29 | Squirrel-cage elastic support |
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| Publication Number | Publication Date |
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| CN111608748A true CN111608748A (en) | 2020-09-01 |
| CN111608748B CN111608748B (en) | 2023-02-28 |
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| CN202010473292.6A Active CN111608748B (en) | 2020-05-29 | 2020-05-29 | Squirrel-cage elastic support |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188704A (en) * | 2021-04-30 | 2021-07-30 | 中国航发湖南动力机械研究所 | Method and device for testing axial force of squirrel-cage elastic support, electronic equipment and medium |
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| CN105738057A (en) * | 2016-02-24 | 2016-07-06 | 中国航空动力机械研究所 | Mouse cage elastic supporting device vibration strain and amplitude calibration system and method |
| CN109026168A (en) * | 2018-07-24 | 2018-12-18 | 北京航空航天大学 | A kind of rotor piezo-electric damping resilient supporting unit |
| CN111238711A (en) * | 2018-11-29 | 2020-06-05 | 中国航发商用航空发动机有限责任公司 | Rotor axial force testing device and testing method |
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2020
- 2020-05-29 CN CN202010473292.6A patent/CN111608748B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105738057A (en) * | 2016-02-24 | 2016-07-06 | 中国航空动力机械研究所 | Mouse cage elastic supporting device vibration strain and amplitude calibration system and method |
| CN109026168A (en) * | 2018-07-24 | 2018-12-18 | 北京航空航天大学 | A kind of rotor piezo-electric damping resilient supporting unit |
| CN111238711A (en) * | 2018-11-29 | 2020-06-05 | 中国航发商用航空发动机有限责任公司 | Rotor axial force testing device and testing method |
Non-Patent Citations (1)
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| 雷沫枝: "基于弹性支承动应力测量的转子系统故障诊断方法", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188704A (en) * | 2021-04-30 | 2021-07-30 | 中国航发湖南动力机械研究所 | Method and device for testing axial force of squirrel-cage elastic support, electronic equipment and medium |
| CN113188704B (en) * | 2021-04-30 | 2022-07-22 | 中国航发湖南动力机械研究所 | Method and device for testing axial force of squirrel-cage elastic support, electronic equipment and medium |
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| Publication number | Publication date |
|---|---|
| CN111608748B (en) | 2023-02-28 |
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