CN109357595B - Method for measuring axial clearance between centrifugal impeller and impeller housing - Google Patents
Method for measuring axial clearance between centrifugal impeller and impeller housing Download PDFInfo
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- CN109357595B CN109357595B CN201811494956.6A CN201811494956A CN109357595B CN 109357595 B CN109357595 B CN 109357595B CN 201811494956 A CN201811494956 A CN 201811494956A CN 109357595 B CN109357595 B CN 109357595B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
Abstract
The invention provides a method for measuring an axial clearance between a centrifugal impeller and an impeller housing, which comprises the following steps: a. assembling the rotor to an air inlet casing and a rear support casing to center the rotor and form an axial gap between the centrifugal impeller and the impeller housing; b. measuring the distance between the rotor and the rear bearing casing to obtain H1; c. the assembling relation between the rotor and the air inlet casing is removed, and the rotor is axially moved to eliminate the axial clearance between the centrifugal impeller and the impeller outer cover; d. measuring the distance between the rotor and the rear bearing casing to obtain H2; e. the value of the axial clearance between the centrifugal impeller and the impeller housing is obtained by subtracting H1 from H2. The measuring method can accurately measure the axial clearance value between the centrifugal impeller and the impeller outer cover under the condition that the rotor is completely centered, not only solves the problem of large measuring error caused by the non-centering of the rotor, but also solves the problem of incapability of measuring caused by the influence of a rear support casing.
Description
Technical Field
The invention relates to the technical field of aircraft engine assembly, in particular to a method for measuring an axial clearance between a centrifugal impeller and an impeller housing.
Background
The rotor of the aircraft engine mainly comprises a centrifugal impeller, a central pull rod, a gas turbine and other parts, and the stator of the aircraft engine mainly comprises an air inlet casing, a rear support casing, an impeller outer cover and other parts. The aircraft engine requires, during the final assembly, the measurement of the axial clearance between the centrifugal impeller and the impeller housing. The axial clearance is the key dimension in the assembly process of the aircraft engine, and if the axial clearance is larger than a required value, the performance of the aircraft engine is unqualified; if the axial clearance is smaller than the required value, the distance between the rotor and the stator is smaller than the safe distance, and potential safety hazards are brought to the aircraft.
If the rotor is assembled on the air inlet casing, the rotor is not assembled on the rear supporting casing, the axial clearance is directly measured, the rotor is not centered at the moment, and the measurement error is large. If the rotor is assembled to the rear bearing cartridge, the axial clearance cannot be measured due to the influence of the rear bearing cartridge.
Disclosure of Invention
The invention provides a method for measuring an axial clearance between a centrifugal impeller and an impeller housing, which aims to solve the problem of how to measure the axial clearance between the centrifugal impeller and the impeller housing under the condition of ensuring the centering of a rotor.
The technical scheme adopted by the invention is as follows:
a method of measuring an axial clearance between a centrifugal impeller and an impeller shroud, comprising the steps of: a. assembling the rotor to an air inlet casing and a rear support casing to center the rotor and form an axial gap between the centrifugal impeller and the impeller housing; b. measuring the distance between the rotor and the rear bearing casing to obtain H1; c. the assembling relation between the rotor and the air inlet casing is released, and the rotor is axially moved to eliminate the axial clearance between the centrifugal impeller and the impeller housing; d. measuring the distance between the rotor and the rear bearing casing to obtain H2; e. the value of the axial clearance between the centrifugal impeller and the impeller housing is obtained by subtracting H1 from H2.
Further, the step a of forming an axial gap between the centrifugal impeller and the impeller housing is specifically as follows: and selecting an adjusting cushion with proper thickness to cushion the impeller outer cover and assembling the adjusting cushion and the impeller outer cover onto the air inlet casing together so as to adjust the axial clearance value between the centrifugal impeller and the impeller outer cover.
Further, the assembling of the rotor to the inlet casing and the rear support casing in step a centers the rotor by: the rotor is fitted to the front support of the inlet casing and the rotor is fitted to the rear support of the rear support casing.
Further, the front bearing includes a roller bearing for bearing axial and radial loads of the rotor and an elastic bearing for assembling the rotor to the intake casing, and the rear bearing employs a roller bearing for bearing radial loads of the rotor.
Furthermore, clearance fit is adopted between the elastic support and the air inlet casing, and clearance fit is adopted between the roller bearing and the rotor, so that the rotor can move axially.
Further, step b is preceded by the step of bringing the rotor in a vertical state to eliminate the play of the roller bearing; step d is preceded by the step of bringing the rotor in a vertical state to eliminate play of the roller bearing.
Further, the step c of releasing the assembly relationship between the rotor and the inlet casing and axially moving the rotor specifically includes: and loosening the bolts on the elastic support from the nuts by 1-1.5 buckles, and sinking the rotor by using gravity.
Further, step c is preceded by the step of bringing the rotor to a horizontal position to facilitate the release of the bolts on the resilient support from the nuts.
Further, the distance between the measuring rotor and the rear support casing in the step b is specifically as follows: measuring the distance between the rear end face of a central pull rod of the rotor and the rear end face of a rear support casing by using a depth gauge; the distance between the measuring rotor and the rear support casing in the step d is specifically as follows: and a depth gauge is adopted to measure the distance between the rear end face of the central pull rod of the rotor and the rear end face of the rear support casing.
Furthermore, the axial clearance value between the centrifugal impeller and the impeller housing is 0.5 mm-0.6 mm.
The invention has the following beneficial effects:
in the general assembly process of the aeroengine, the rotor is firstly assembled on the air inlet casing and the rear support casing to center the rotor, and the axial gap to be measured is formed between the centrifugal impeller and the impeller outer cover. At this time, the distance between the rotor and the rear bearing case was measured, and H1 was obtained. And removing the assembly relation between the rotor and the air inlet casing, axially moving the rotor to enable the centrifugal impeller to be attached to the impeller housing so as to eliminate the axial clearance between the centrifugal impeller and the impeller housing, wherein the maximum axial movement distance of the rotor is the axial clearance value between the centrifugal impeller and the impeller housing. At this time, the distance between the rotor and the rear bearing case was measured, and H2 was obtained. And subtracting H1 from H2 to obtain the axial clearance value between the centrifugal impeller and the impeller housing. The distance between the rotor and the rear support casing is measured and the difference value is calculated under the two states of axial clearance and attachment between the centrifugal impeller and the impeller housing, so that the axial clearance value between the centrifugal impeller and the impeller housing can be accurately measured under the condition of complete centering of the rotor, the problem of large measurement error caused by the fact that the rotor is not centered is solved, and the problem that the measurement cannot be carried out due to the influence of the rear support casing is solved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow diagram of a method of measuring the axial clearance between a centrifugal impeller and an impeller housing in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a rotor of a preferred embodiment of the present invention in a vertical position to measure axial clearance;
fig. 3 is a schematic view of the axial clearance between the centrifugal impeller and the impeller housing of the preferred embodiment of the present invention.
Description of reference numerals:
1. an air inlet casing; 2. a rear support case; 3. a centrifugal impeller; 4. an impeller housing; 5. an adjustment pad; 6. a roller bearing; 7. an elastic support; 8. a roller bearing; 9. a central pull rod.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic flow diagram of a method of measuring the axial clearance between a centrifugal impeller and an impeller housing in accordance with a preferred embodiment of the present invention; FIG. 2 is a schematic view of a rotor of a preferred embodiment of the present invention in a vertical position to measure axial clearance; fig. 3 is a schematic view of the axial clearance between the centrifugal impeller and the impeller housing of the preferred embodiment of the present invention.
As shown in fig. 1, the method for measuring the axial gap between the centrifugal impeller and the impeller housing of the present embodiment includes the steps of: a. assembling the rotor to the inlet casing 1 and the rear support casing 2 to center the rotor and form an axial gap between the centrifugal impeller 3 and the impeller housing 4; b. measuring the distance between the rotor and the rear bearing cartridge 2, obtaining H1; c. the assembling relation between the rotor and the air inlet casing 1 is released, and the rotor is axially moved to eliminate the axial clearance between the centrifugal impeller 3 and the impeller housing 4; d. measuring the distance between the rotor and the rear bearing cartridge 2, obtaining H2; e. the value of the axial clearance between the centrifugal impeller 3 and the impeller housing 4 is obtained by subtracting H1 from H2. In the general assembly process of the aeroengine, the rotor is firstly assembled on the air inlet casing 1 and the rear support casing 2 to center the rotor, and a to-be-measured axial gap is formed between the centrifugal impeller 3 and the impeller housing 4. At this time, the distance between the rotor and the rear bearing case 2 was measured, and H1 was obtained. And (3) removing the assembly relation between the rotor and the air inlet casing 1, axially moving the rotor to enable the centrifugal impeller 3 to be attached to the impeller housing 4 so as to eliminate the axial gap between the centrifugal impeller 3 and the impeller housing 4, wherein the maximum axial moving distance of the rotor is the axial gap value between the centrifugal impeller 3 and the impeller housing 4. At this time, the distance between the rotor and the rear bearing case 2 was measured, and H2 was obtained. The axial clearance value between the centrifugal impeller 3 and the impeller housing 4 can be obtained by subtracting H1 from H2. By measuring the distance between the rotor and the rear support casing 2 and calculating the difference value thereof in two states of axial clearance and attachment between the centrifugal impeller 3 and the impeller housing 4 respectively, the axial clearance value between the centrifugal impeller 3 and the impeller housing 4 can be accurately measured under the condition of complete centering of the rotor, the problem of large measurement error caused by the fact that the rotor is not centered is solved, and the problem of incapability of measurement caused by the influence of the rear support casing 2 is solved.
As shown in fig. 3, in the present embodiment, the axial gap formed between the centrifugal impeller 3 and the impeller housing 4 in step a is specifically: the adjusting pad 5 of a suitable thickness is selected to cushion the impeller housing 4 and is assembled to the intake casing 1 together with the impeller housing 4 to adjust the axial gap value between the centrifugal impeller 3 and the impeller housing 4. The impeller housing 4 is padded up by the adjusting pad 5, the assembling hole on the adjusting pad 5 is aligned with the assembling hole on the impeller housing 4, and then the adjusting pad 5 and the impeller housing 4 are assembled on the air inlet casing 1 together. By calculating the axial dimension of each component, the adjusting pad 5 with proper thickness is selected to adjust the position of the impeller housing 4, and further the axial clearance value between the centrifugal impeller 3 and the impeller housing 4 is adjusted to a proper range.
As shown in fig. 2, in the present embodiment, the assembling of the rotor to the inlet casing 1 and the rear support casing 2 in step a centers the rotor specifically as follows: the rotor is fitted to the front support of the inlet casing 1 and to the rear support of the rear support casing 2. The rotor adopts a 1-0-1 bearing structure, i.e. the front end of the rotor is assembled on a front bearing positioned in the air inlet casing 1, and the rear end of the rotor is assembled on a rear bearing positioned in the rear bearing casing 2, so as to center the rotor.
As shown in fig. 2, in the present embodiment, the front support includes a roller bearing 6 for receiving the axial load and the radial load of the rotor and an elastic support 7 for assembling the rotor to the intake casing 1, and the rear support employs a roller bearing 8 for receiving the radial load of the rotor. The front bearing comprises a roller bearing 6 and a resilient support 7, the roller bearing 6 transmits the axial load and the radial load of the rotor to the intake casing 1, and the resilient support 7 is fixed to the intake casing 1 by bolts and nuts. And the rear support adopts a roller bearing 8, and the roller bearing 8 only bears the radial load of the rotor.
In the present embodiment, as shown in fig. 2, the elastic support 7 and the inlet casing 1 are in clearance fit, and the roller bearing 8 and the rotor are in clearance fit, so that the rotor can move axially.
As shown in fig. 2, in the present embodiment, step b further includes a step of bringing the rotor into a vertical state to eliminate the play of the roller bearing 6; step d is preceded by the step of bringing the rotor in a vertical state to eliminate the play of the roller bearing 6. The rotor is in a vertical state (namely the front end of the rotor faces downwards), the rotor is stressed forwards, the roller bearing 6 is centered and stressed axially, the play of the roller bearing 6 can be eliminated, and the stress condition of the aircraft engine in a working state is simulated. The axial clearance value between the centrifugal impeller 3 and the impeller housing 4 measured at the moment is the axial clearance value between the centrifugal impeller 3 and the impeller housing 4 in the working state of the aero-engine, and the accuracy of the measured axial clearance value can be ensured.
As shown in fig. 2, in the present embodiment, the step c of releasing the assembly relationship between the rotor and the inlet casing 1 and axially moving the rotor specifically includes: the bolts on the elastic support 7 are loosened from the nuts by 1-1.5 buckles, and the rotor is sunk by gravity. After the bolts on the elastic support 7 are loosened from the nuts, the assembly relationship between the rotor and the air inlet casing 1 is released, the rotor sinks under the action of gravity until the centrifugal impeller 3 is attached to the impeller housing 4, and the axial gap between the centrifugal impeller 3 and the impeller housing 4 is eliminated. And 1, the thread pitch of the threads on the bolt and the nut is shown, and the bolt and the nut are slightly loosened, so that the aeroengine can be assembled after the measurement is finished.
In this embodiment, step c further comprises the step of making the rotor horizontal to facilitate the release of the bolts from the nuts on the elastic support 7, as shown in fig. 2. The horizontal position of the rotor facilitates the operator to loosen the bolts on the elastic support 7 from the nuts. If the rotor is in a vertical state, an operator must lie below the rotor, which is inconvenient to operate.
As shown in fig. 2, in the present embodiment, the distance between the measuring rotor and the rear support casing 2 in step b is specifically: measuring the distance between the rear end face of a central pull rod 9 of the rotor and the rear end face of the rear support casing 2 by adopting a depth gauge; the distance between the measuring rotor and the rear support case 2 in step d is specifically: the distance between the rear end face of the central tie rod 9 of the rotor and the rear end face of the rear bearing housing 2 is measured with a depth gauge. The distance between the rear end face of the rotor's central tie rod 9 and the rear end face of the rear bearing housing 2 can be conveniently measured by means of a depth gauge.
As shown in fig. 3, in the present embodiment, the axial gap between the centrifugal impeller 3 and the impeller housing 4 is 0.5mm to 0.6 mm. The axial clearance value is 0.5 mm-0.6 mm, the performance of the aircraft engine can be guaranteed to be qualified, the distance between the rotor and the stator is guaranteed to be larger than the safe distance, and potential safety hazards can not be brought to the aircraft.
In particular, a method for measuring an axial clearance between a centrifugal impeller and an impeller housing is provided.
The rotor is centred by fitting it to the inlet casing 1 and to the rear support casing 2. The rotor is brought into a vertical state, the play of the roller bearing 6 is eliminated, and an axial clearance to be measured is formed between the centrifugal impeller 3 and the impeller housing 4. H1 is obtained by measuring the distance between the rear end face of the center stay 9 and the rear end face of the rear support case 2. The rotor is in a horizontal state, the bolts and the nuts 1-1.5 on the elastic support 7 are loosened, and then the rotor is in a vertical state, so that the rotor can sink under the action of gravity, and the centrifugal impeller 3 is attached to the impeller housing 4. At this time, the distance between the rear end surface of the center stay 9 and the rear end surface of the rear support case 2 was measured to obtain H2. The Δ H is calculated as H2-H1, which is the axial clearance between the centrifugal impeller 3 and the impeller housing 4.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of measuring an axial clearance between a centrifugal impeller and an impeller shroud, comprising the steps of:
a. assembling the rotor to an air inlet casing (1) and a rear support casing (2) to centre the rotor and form an axial gap between a centrifugal impeller (3) and an impeller housing (4);
b. measuring the distance between the rotor and the rear support casing (2) to obtain H1, and measuring the distance between the rear end face of the central pull rod 9 of the rotor and the rear end face of the rear support casing 2 by adopting a depth gauge;
c. releasing the assembling relation between the rotor and the air inlet casing (1), and axially moving the rotor to enable the centrifugal impeller (3) and the impeller housing (4) to be attached to eliminate the axial clearance between the centrifugal impeller (3) and the impeller housing (4);
d. measuring the distance between the rotor and the rear support casing (2) to obtain H2, and measuring the distance between the rear end face of the central pull rod 9 of the rotor and the rear end face of the rear support casing 2 by adopting a depth gauge;
e. subtracting H1 from H2 to obtain the axial clearance value between the centrifugal impeller (3) and the impeller housing (4).
2. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 1,
the step a of forming an axial gap between the centrifugal impeller (3) and the impeller housing (4) is specifically as follows: selecting an adjusting pad (5) with a proper thickness to pad the impeller housing (4) and assembling the adjusting pad and the impeller housing (4) on the air inlet casing (1) so as to adjust the axial clearance value between the centrifugal impeller (3) and the impeller housing (4).
3. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 1,
the step a of assembling the rotor on the air inlet casing (1) and the rear support casing (2) to center the rotor is as follows: -fitting the rotor to the front support of the inlet casing (1), -fitting the rotor to the rear support of the rear support casing (2).
4. A method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 3,
the front support comprises a roller bearing (6) for bearing the axial load and the radial load of the rotor and an elastic support (7) for assembling the rotor to the air inlet casing (1), and the rear support adopts a rolling rod bearing (8) for bearing the radial load of the rotor.
5. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 4,
the elastic support (7) and the air inlet casing (1) are in clearance fit, and the roller support (8) and the rotor are in clearance fit, so that the rotor can move axially.
6. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 5,
step b is preceded by a step of bringing the rotor in a vertical condition to eliminate play of the roller bearing (6);
the step d is preceded by a step of bringing the rotor in a vertical state to eliminate play of the roller bearing (6).
7. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 6,
the step c of releasing the assembling relationship between the rotor and the air inlet casing (1) and axially moving the rotor specifically comprises the following steps: and loosening the bolts on the elastic support (7) from the nuts by 1-1.5 buckles, and making the rotor sink by using gravity.
8. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 7,
the step c is also preceded by a step of bringing the rotor in a horizontal position so as to loosen the bolts and nuts on the elastic support (7).
9. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 1,
the step b of measuring the distance between the rotor and the rear support casing (2) is specifically as follows: measuring the distance between the rear end face of the central pull rod (9) of the rotor and the rear end face of the rear support casing (2) by using a depth gauge;
the step d of measuring the distance between the rotor and the rear support casing (2) is specifically as follows: and measuring the distance between the rear end face of the central pull rod (9) of the rotor and the rear end face of the rear support casing (2) by adopting a depth gauge.
10. The method of measuring an axial gap between a centrifugal impeller and an impeller housing according to claim 1,
the axial clearance value between the centrifugal impeller (3) and the impeller housing (4) is 0.5 mm-0.6 mm.
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| CN201811494956.6A CN109357595B (en) | 2018-12-07 | 2018-12-07 | Method for measuring axial clearance between centrifugal impeller and impeller housing |
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| CN201811494956.6A CN109357595B (en) | 2018-12-07 | 2018-12-07 | Method for measuring axial clearance between centrifugal impeller and impeller housing |
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| CN109357595B true CN109357595B (en) | 2020-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145472B (en) * | 2019-06-05 | 2020-10-09 | 中国航发控制系统研究所 | Impeller and volute gap measuring device |
| CN110328493B (en) * | 2019-06-28 | 2020-07-24 | 中国航发南方工业有限公司 | Method for controlling the axial clearance between the tip of a centrifugal impeller and a shroud |
| CN110686640B (en) * | 2019-11-12 | 2021-06-04 | 中国航发南方工业有限公司 | Method for measuring clearance between rotor part and stator part of centrifugal compressor |
| CN111076692A (en) * | 2019-12-19 | 2020-04-28 | 北京卫星制造厂有限公司 | High-precision shafting axial clearance calculation method for multistage planetary reduction mechanism |
| CN113804087A (en) * | 2021-09-09 | 2021-12-17 | 中国航发南方工业有限公司 | Centrifugal impeller blade tip clearance matching method |
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| JPS55121102A (en) * | 1979-03-10 | 1980-09-18 | Mitsubishi Heavy Ind Ltd | Measuring instrument for thrust gap of exhaust turbosupercharger |
| JP3925597B2 (en) * | 1999-09-17 | 2007-06-06 | リコープリンティングシステムズ株式会社 | Paper thickness measuring device |
| CN1195153C (en) * | 2003-05-21 | 2005-03-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Axial-flow blower |
| CN102814633B (en) * | 2011-11-30 | 2014-12-10 | 凯迈(洛阳)机电有限公司 | Method for adjusting air gap of rotor of disc type electrical eddy current dynamometer |
| CN103032573A (en) * | 2012-12-31 | 2013-04-10 | 哈尔滨东安发动机（集团）有限公司 | Helicopter main rotor shaft dynamic sealing structure |
| CN103056653B (en) * | 2013-01-11 | 2015-12-02 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of bracket type core machine assembly method |
| KR101467384B1 (en) * | 2013-07-18 | 2014-12-02 | 효성굿스프링스 주식회사 | Gap measurement jig of pump |
| CN103630103B (en) * | 2013-11-29 | 2016-02-10 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of measurement mechanism of guide vane listrium gap |
| CN105458647B (en) * | 2015-11-20 | 2017-06-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Rotor and assembly method of the stator axial gap without the power turbine for adjusting |
| RU2630292C1 (en) * | 2016-04-29 | 2017-09-06 | Акционерное общество "Московский вертолетный завод им. М.Л. Миля" | Device for measuring side locking of shear connection |
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