JP2005042612A - Casing, deformation prevention system of casing, and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide passages allowing gas to flow in a casing so as to prevent deformation of the casing caused by thermal deformation. <P>SOLUTION: In the casing 7 having rotating parts 3, 5 in the inside of a rotating machine 1 and a circular cross section covering the rotating parts 3, 5 from the outside, a proper number of the passages 11 through which fluid is made to pass are provided in the thickness of the casing 7. The casing 7 has a proper number of detecting parts 13a for detecting a deformation amount of the casing 7, and a control part 15 for controlling a state of the fluid passing through the passages 11 according to the detected value. The casing 7 is deformed by the change in temperature caused by passage of the fluid, and the deformation amount is kept within a prescribed range. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a casing, a casing deformation prevention system, and a method thereof. Regarding the method.

  Conventionally, in a rotating machine (for example, a jet engine, a turbine, a compressor, etc.), the outside is covered with an annular (for example, a circular cross section) casing. This casing has a case where it is not half-cracked and a case where it is half-cracked.

On the other hand, it is important to grasp the characteristics of the compressor at the development stage of an aircraft jet engine or the like. For this reason, the aerodynamic performance test is implemented (for example, nonpatent literature 1).
ASME97-GT-103

  As described above, the outer shape of the casing has a shape similar to a cylinder, but when attached to a rotating machine, it tends to be elliptical (for example, due to thermal effects). In particular, in the case of a half-cracked casing, there is a problem in that precise dimensional accuracy cannot be obtained.

  On the other hand, even in the development stage, for example, when a performance test is performed on a half-cracked casing, deformation (for example, ovalization) occurs due to thermal effects. Thereby, since the clearance gap between a rotor (for example, rotation part) and a casing does not become uniform, there exists a problem that performance evaluation cannot be grasped | ascertained correctly.

  The present invention has been made in view of the above-described problems, and the invention according to claim 1 provides an appropriate number of passages through which a fluid passes in an annular casing that covers a rotating part inside a rotating machine from the outside. Provided within the thickness of the casing, detects the deformation amount of the casing, controls the state of the fluid passing through the passage corresponding to the detected value, and changes the deformation amount within a predetermined range by the temperature change due to the passage of the fluid This is the casing inside.

  According to a second aspect of the present invention, in the annular casing that covers the rotating part inside the rotating machine from the outside, the casing is half-cracked, and consists of one half-cracked casing and the other half-cracked casing, and allows fluid to pass therethrough. A passage is provided at the joint between the one half-cracked casing and the other half-cracked casing, the amount of deformation of the casing is detected, and the state of the fluid passing through the passage is controlled corresponding to the detected value, It is a casing which makes a deformation amount into a predetermined range by the temperature change by passage of the fluid.

  The invention according to a third aspect is the casing according to the first or second aspect, wherein the deformation amount is detected at a location close to the passage.

  The invention according to claim 4 is the casing according to claim 1, 2 or 3, wherein the deformation amount is obtained by detecting a tip clearance between an inner surface of the casing and the moving blade.

  The invention according to claim 5 is the casing deformation preventing system for preventing deformation of the annular casing that covers the rotating part inside the rotating machine from the outside, and an appropriate number of passages through which the fluid provided in the casing passes, and the casing An appropriate number of detection units for detecting the amount of deformation of the liquid and a control unit for controlling the state of the fluid that passes through the passage corresponding to the detected value, and the amount of deformation is predetermined by the temperature change caused by the passage of the fluid This is a casing deformation prevention system within the range.

  The invention according to claim 6 is the casing deformation preventing method for preventing the deformation of the cylindrical casing that covers the rotating part inside the rotating machine from the outside, and the deformation amount of the casing is detected by an appropriate number of detection units, A casing deformation preventing method for controlling a state of fluid passing through an appropriate number of passages provided in the casing corresponding to the detected value, and setting a deformation amount within a predetermined range by a temperature change caused by the passage of the fluid. .

  According to the present invention, the following effects can be obtained. That is, deformation such as ovalization of the casing can be prevented.

  On the other hand, even in the development stage (during the test), even when the casing is deformed (for example, ovalization), heat can be distributed in the circumferential direction by flowing air into the groove. Thereby, a thermal expansion difference occurs in the circumferential direction. Therefore, the clearance between the rotor and the casing (tip clearance) becomes uniform, and the ovalization of the casing can be reduced. And there is an effect that an accurate performance test can be performed.

  Embodiments of the present invention will be described with reference to the drawings. Please refer to FIG. 1 and FIG. FIG. 1 is a cross-sectional view (longitudinal direction) of the rotating machine 1. FIG. 2 is a view of the rotary machine 1 as viewed from the cross section AA (circular direction).

  As shown in FIG. 1, a rotating machine (for example, a jet engine, a turbine, a compressor, etc.) 1 has a rotating part (for example, a rotating body 3 and a plurality of moving blades 5 attached to the rotating body 3). is doing.

  The rotating machine 1 includes an annular (for example, circular in cross section) casing 7 that covers the rotating portion (the rotating body 3 and the plurality of moving blades 5 attached to the rotating body 3) from the outside. (Assuming that the casing 7 in this example is half-divided into two).

  A plurality of stationary blades 9 are attached to the casing 7. The casing 7 has an appropriate number (in this example, two places) of passages 11 through which fluid (for example, air) is passed to each connecting portion of the casing 7 (the connecting portion between the flange 23a and the flange 23b shown in FIG. 2). Provided. In a casing that is not half-broken, for example, the passage 11 is provided in the wall thickness.

  Here, the passage 11 is provided long in the longitudinal direction of the rotary machine 1 (in the direction of the rotation axis CL). By providing a long passage in the longitudinal direction of the casing 7, the casing 7 can be cooled uniformly even when the longitudinal outline of the casing 7 draws a complicated curve. For this reason, the ovalization of the circumferential direction of the annular casing 7 can be prevented more appropriately.

  Then, the rotating machine 1 passes through the passage 11 corresponding to the appropriate number (1 or 2) of detecting portions 13a and 13b (see FIG. 2) for detecting the deformation amount of the casing 7 and the detected deformation amount. And a control unit 15 that controls the state of the fluid (for example, air) (for example, the flow rate of air, the temperature of air, or the stop of the supply of air).

  In this example, only two detection units 13a and 13b are shown, but in practice, a plurality of detection units 13a and 13b are preferably arranged at appropriate positions. This is because the outer shape of the casing 7 can be grasped more accurately.

  Return explanation. The control unit 15 reads the deformation amount (for example, circumferential ovalization) of the casing 7 detected by the detection units 13a and 13b, and sets the predetermined deformation amount of the casing and the thermal expansion amount of the casing due to the passage of fluid. Therefore, the flow rate of the fluid and the temperature of the fluid are controlled to prevent the casing 7 from becoming elliptical in the circumferential direction (preventing elliptication due to temperature change). That is, the input valve 17 controlled by the control unit 15 controls the flow rate, and the heat exchanger 19 controlled by the control unit 15 controls the temperature of the fluid. This fluid flows through the pipe and flows in the direction of the arrow AR and is exhausted from the outlet 21. Thereby, a difference in thermal expansion occurs due to a temperature change caused by the passage of the fluid, and the casing 7 can be deformed to return the deformation amount to the original range and keep it within a predetermined range.

  As described above, in this example, as shown in FIG. 2, the casing 7 is half-cracked, and is composed of one half-cracked casing 7a and the other half-cracked casing 7b. A passage 11 for allowing fluid to pass therethrough is provided in a joint between the one half-cracked casing 7a and the other half-cracked casing 7b (in this example, the flange 23a and the flange 23b are joined by a bolt or the like). It has been. In addition, although not shown in figure, the coupling | bond part is provided also in the opposite direction (opposite direction) of the coupling | bond part demonstrated above (namely, two places are provided).

  And it is preferable to provide the said detection part 13a close to the said channel | path 11 (a detection part is also provided in the vicinity of the other coupling part not shown). That is, by changing the temperature (for example, cooling) at a location close to the location detected by the detection unit 13a, the amount of deformation is restored more accurately (the circumferential direction of the casing 7 is changed to an accurate circular shape without distortion). Can return).

  Further, it is desirable that the detection unit 13a detects a clearance (tip clearance) C between the inner surface of the casing 7 and the moving blade 5. That is, the moving blade 5 forms an accurate circular shape and rotates. Then, by detecting the amount of clearance (tip clearance) C between the moving blade 5 and the inner surface of the casing 7, deformation (for example, ovalization) of the casing 7 can be measured.

  Please refer to FIG. One half-cracked casing and the other half-cracked casing are coupled by a coupling portion and are distorted into an elliptical shape 31 that is long in the vertical direction. Then, the distortion amounts A1 and A2 are detected by the detection unit, and a fluid (for example, cooled air) corresponding to the distortion amounts A1 and A2 is caused to flow through paths provided in the respective coupling portions. As a result, the predetermined portions Ea and Eb along the path are cooled, and the casing is deformed in the direction of the arrow AR2 due to the difference in thermal expansion, and returns to the circular shape 33 without distortion.

  Please refer to FIG. One half-cracked casing and the other half-cracked casing are joined by a joint portion and distorted into an elliptical shape 41 that is long in the lateral direction. Then, the distortion amounts B1 and B2 are detected by the detector, and fluids (for example, warmed air) corresponding to the distortion amounts B1 and B2 (in this case, the values of B1 and B2 are negative values) are respectively detected. It flows in the route provided in the joint part. As a result, the predetermined portions Ea and Eb are warmed, and the casing is deformed in the direction of the arrow AR3 due to the difference in thermal expansion and returns to the circular shape 43 without distortion.

  In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change.

It is the schematic which shows the outline of the casing of a rotary machine. It is sectional drawing which shows the cross section of a rotary machine. It is explanatory drawing explaining the deformation | transformation of a casing. It is explanatory drawing explaining the deformation | transformation of a casing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating machine 3 Rotating body 5 Rotor blade 7 Casing 9 Stator blade 11 Path | route 13a Detection part 15 Control part 17 Input valve part 19 Heat exchanger 21 Outlet part C Tip clearance

Claims (6)

In the annular casing that covers the rotating part inside the rotating machine from the outside,
Providing an appropriate number of passages in the wall thickness of the casing for passing fluid;
The deformation amount of the casing is detected, the state of the fluid passing through the passage is controlled in accordance with the detected value, and the deformation amount is set within a predetermined range by a temperature change due to the passage of the fluid. casing. In the annular casing that covers the rotating part inside the rotating machine from the outside,
The casing is half-cracked, and is composed of one half-cracked casing and the other half-cracked casing, and a passage for allowing fluid to pass through is provided at a joint between the one half-cracked casing and the other half-cracked casing,
A deformation amount of the casing is detected, a state of the fluid passing through the passage is controlled corresponding to the detected value, and the deformation amount is set within a predetermined range by a temperature change due to the passage of the fluid. casing.   The casing according to claim 1, wherein the deformation amount is detected at a location close to the passage.   The casing according to claim 1, 2, or 3, wherein the amount of deformation is obtained by detecting a tip clearance between an inner surface of the casing and a moving blade. In the casing deformation prevention system for preventing deformation of the annular casing that covers the rotating part inside the rotating machine from the outside,
An appropriate number of passages for allowing fluid to pass through the casing, an appropriate number of detection units for detecting the deformation amount of the casing, and a control unit for controlling the state of the fluid passing through the passages corresponding to the detected value. Have
A casing deformation prevention system, wherein the deformation amount is within a predetermined range by a temperature change caused by the passage of the fluid. In a casing deformation preventing method for preventing deformation of a cylindrical casing that covers a rotating part inside a rotating machine from the outside,
The amount of deformation of the casing is detected by an appropriate number of detection units, and the state of the fluid passing through the appropriate number of passages provided in the casing corresponding to the detected value is controlled,
A method for preventing deformation of a casing, wherein the deformation amount is set within a predetermined range due to a temperature change caused by passage of the fluid.

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