Method for detecting gas load of adjustable stator vane of compressor and compressor

Abstract

The present invention discloses a method for detecting the gas load of an adjustable stator vane of a compressor and a compressor. The adjustable stator vane is rotatably arranged on the casing of the compressor relative to the casing. The compressor includes an adjusting mechanism for adjusting the angle of rotation of the adjustable stator vane relative to the casing. The adjusting mechanism includes a rocker arm fixedly connected to the adjustable stator vane and a connecting rod connected to the rocker arm. The detection method includes: detecting and obtaining the angle value of the adjustable stator vane relative to the casing; detecting and obtaining the strain value in the axial direction of the connecting rod by arranging a strain gauge on the connecting rod, and calculating the axial force of the connecting rod according to the strain value and the structural parameters of the connecting rod; calculating the gas load according to the angle value, the calculated axial force and the structural parameters of the adjusting mechanism.

Description

Technical Field

[0001] The present invention relates to the field of aviation technology, and particularly relates to a method for detecting the gas load of adjustable stator blades of a compressor and a compressor. Background Art

[0002] When an aeroengine is operating, a surge phenomenon may occur. In order to reduce the occurrence of surge in the aeroengine, in the prior art, the stator blades of the compressor of the aeroengine are often designed as adjustable stator blades with adjustable angles, and the adjustable stator blades adjust their rotation angles through an adjustment mechanism. In order to carry out the structural design of the aeroengine or to understand the surge characteristics of the aeroengine, etc., it is very necessary to understand the gas loads of the stator blades of the compressor of the aeroengine during normal operation or during surge. Summary of the Invention

[0003] In view of this, some embodiments of the present invention provide a method for detecting the gas load of adjustable stator blades of a compressor and a compressor, and this detection method can conveniently and effectively detect the gas load of the adjustable stator blades.

[0004] Some embodiments of the present invention disclose a method for detecting the gas load of adjustable stator blades of a compressor. The adjustable stator blades are rotatably arranged on the casing of the compressor relative to the casing. The compressor includes an adjustment mechanism for adjusting the rotation angle of the adjustable stator blades relative to the casing. The adjustment mechanism includes a rocker arm fixedly connected to the adjustable stator blades and a connecting rod connected to the rocker arm. The detection method includes:

[0005] Detecting and obtaining the angle value of the adjustable stator blades relative to the casing;

[0006] By arranging a strain gauge on the connecting rod to detect and obtain the strain value in the axial direction of the connecting rod, and calculating the axial force of the connecting rod according to the strain value and the structural parameters of the connecting rod;

[0007] Calculating the gas load according to the angle value, the calculated axial force, and the structural parameters of the adjustment mechanism.

[0008] In some embodiments, calculating the gas load according to the angle value, the calculated axial force, and the structural parameters of the adjustment mechanism includes:

[0009] Calculating the tangential force acting on the end of the rocker arm in the swinging direction of the rocker arm according to the calculated axial force, the angle value, and the structural parameters of the adjustment mechanism;

[0010] Calculate the active balance torque exerted by the adjusting mechanism on the adjustable stator vane according to the calculated tangential force and the structural parameters of the rocker arm, and calculate the gas load according to the active balance torque.

[0011] In some embodiments, calculating the gas load according to the active balance torque includes:

[0012] Obtain the frictional resistance torque between the adjusting mechanism and the adjustable stator vane, and calculate the gas load according to the active balance torque and the frictional resistance torque.

[0013] In some embodiments, obtaining the strain value of the connecting rod by detecting with a strain gauge disposed on the connecting rod includes: forming a plane by machining on the connecting rod or disposing a structure with a plane to dispose the strain gauge on the plane.

[0014] In some embodiments, detect the gas load of the adjustable stator vane when the compressor is in a surge condition.

[0015] In some embodiments, detect the gas load of the adjustable stator vane when the adjusting mechanism adjusts the angle of rotation of the adjustable stator vane relative to the casing.

[0016] Some embodiments of the present invention further disclose a compressor, including:

[0017] An adjustable stator vane rotatably disposed on the casing relative to the casing of the compressor;

[0018] An adjusting mechanism for adjusting the angle of rotation of the adjustable stator vane relative to the casing, including a rocker arm fixedly connected to the adjustable stator vane, a connecting rod connected to the rocker arm, and a driving device connected to the connecting rod, the driving device being configured to drive the connecting rod to drive the rocker arm to swing to adjust the angle of rotation of the adjustable stator vane relative to the casing;

[0019] An angle detection device for detecting the angle value of the adjustable stator vane relative to the casing;

[0020] A strain gauge disposed on the connecting rod for detecting the strain value in the axial direction of the connecting rod;

[0021] A control device is signal-connected to the angle detection device and the strain gauge, and is configured to calculate the axial force of the connecting rod according to the strain value and the structural parameters of the connecting rod, and calculate the gas load according to the angle value, the calculated axial force, and the structural parameters of the adjusting mechanism.

[0022] In some embodiments, a plane is provided on the connecting rod, and the strain gauge is disposed on the plane.

[0023] In some embodiments, the adjusting mechanism includes a driving device, a linkage ring connected to the rocker arm, and a connecting rod connected between the linkage ring and the driving device.

[0024] Based on the method for detecting the gas load of the adjustable stator vane of the compressor provided by some embodiments of the present invention, by detecting and obtaining the angle value of the relative rotation of the adjustable stator vane with respect to the casing, and arranging a strain gauge on the connecting rod to detect and obtain the strain value in the axial direction of the connecting rod, the gas load acting on the adjustable stator vane can be conveniently and effectively calculated in combination with the structural parameters of the adjusting mechanism.

[0025] Applying the compressor provided by some embodiments of the present invention can implement this detection method and achieve corresponding beneficial effects.

[0026] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0028] Figure 1 is a schematic structural diagram of the adjusting mechanism of the compressor according to some embodiments of the present invention;

[0029] Figure 2 is a schematic structural diagram of the connecting rod of the adjusting mechanism according to some other embodiments of the present invention;

[0030] Figure 3 is a schematic structural diagram of the connecting rod of the adjusting mechanism according to still some other embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] For the sake of convenience of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used here to describe the spatial positional relationship of a device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0034] As Figures 1 to 3 shown in some embodiments, the adjustable stator vanes are rotatably disposed on the casing of the compressor for guiding the air flow entering the compressor. In the embodiments as Figure 1 shown, five adjustable stator vanes are schematically shown, namely the first adjustable stator vane, the second adjustable stator vane, the third adjustable stator vane, the fourth adjustable stator vane, and the fifth adjustable stator vane. Each adjustable stator vane is connected to the casing of the compressor through a shaft portion located at its top (the casing of the compressor is not schematically shown in Figure 1 ), and the adjustable stator vane rotates around the axis of its shaft portion to adjust its angle relative to the casing. The first adjustable stator vane 11 is connected to the casing of the compressor through the first shaft portion 110 located at its top end.

[0035] The compressor includes an adjusting mechanism for adjusting the angle of rotation of the adjustable stator vanes relative to the casing. The adjusting mechanism includes a rocker arm fixedly connected to the adjustable stator vanes and a connecting rod connected to the rocker arm.

[0036] The rocker arm is fixedly connected to the shaft portion of the adjustable stator vane. When the rocker arm swings, it drives the shaft portion to rotate about its axis, thereby driving the adjustable stator vane to rotate relative to the casing and changing the angle of the adjustable stator vane relative to the casing. When the angle of the adjustable stator vane relative to the casing remains unchanged, the rocker arm remains stationary, and the rocker arm provides an active balancing torque to keep the adjustable stator vane in force balance.

[0037] The connecting rod is used to transmit the driving force for swinging the rocker arm to the rocker arm, or the connecting rod provides the driving force for keeping the rocker arm stationary to keep the adjustable stator vane in force balance. The connecting rod and the rocker arm can be indirectly connected through a linkage ring as shown in the figure. In some embodiments not shown in the figure, the connecting rod can also be directly connected to the rocker arm.

[0038] In the embodiment shown in the figure, the rocker arm includes a first rocker arm 6 fixedly connected to the shaft portion of the first adjustable stator vane, a second rocker arm 7 fixedly connected to the shaft portion of the second adjustable stator vane, a third rocker arm 8 fixedly connected to the shaft portion of the third adjustable stator vane, a fourth rocker arm 9 fixedly connected to the shaft portion of the fourth adjustable stator vane, and a fifth rocker arm 10 fixedly connected to the shaft portion of the fifth adjustable stator vane.

[0039] In the embodiment shown in the figure, the connecting rod includes a first connecting rod 12 indirectly connected to the first adjustable stator vane through a first linkage ring 1, a second connecting rod 13 indirectly connected to the second adjustable stator vane through a second linkage ring 2, a third connecting rod 14 indirectly connected to the third adjustable stator vane through a third linkage ring 3, a fourth connecting rod 15 indirectly connected to the fourth adjustable stator vane through a fourth linkage ring 4, and a fifth connecting rod 16 indirectly connected to the fifth adjustable stator vane through a fifth linkage ring 5.

[0040] The method for detecting the gas load of the adjustable stator vanes of the compressor in some embodiments includes:

[0041] Detecting and obtaining the angle value of the adjustable stator vane relative to the casing; the angle value of the adjustable stator vane relative to the casing can be calculated by detecting the initial angle value of the adjustable stator vane relative to the casing (the initial angle value can be defined by the angle reference position) and the rotation angle value of the adjustable stator vane relative to the casing. The angle value of the adjustable stator vane relative to the casing can be detected by an angle detection device. The angle value of the adjustable stator vane relative to the casing can be obtained by detecting the rotation angle of the shaft portion of the adjustable stator vane or by detecting the swing angle of the rocker arm fixedly connected to the adjustable stator vane, etc.

[0042] Such as Figures 1 to 3As shown, by arranging a strain gauge on the connecting rod to detect and obtain the strain value in the axial direction of the connecting rod, the axial force of the connecting rod is calculated based on the strain value and the structural parameters of the connecting rod; in the adjusting mechanism, the connecting rod mainly bears the axial force, so it is suitable to arrange a strain gauge to detect the force condition of the connecting rod. For example, in the Figure 1 embodiment shown, the linkage ring is connected to the rocker arm. When adjusting the angle of the adjustable stator vane, the linkage ring rotates to drive the rocker arm to swing. The connecting rod is connected to the outer peripheral surface of the linkage ring. The axial force of the connecting rod causes the linkage ring to rotate to drive the rocker arm to swing, or provides a balance force to keep the rocker arm stationary to the rocker arm. According to the strain value measured by the strain gauge and combined with the mechanism parameters of the connecting rod, such as the cross-sectional value and elastic modulus of the connecting rod, etc., the axial force of the connecting rod can be calculated.

[0043] The gas load is calculated based on the angle value, the calculated axial force, and the structural parameters of the adjusting mechanism; the initial values of the structural parameters of the adjusting mechanism can all be obtained by measurement during the installation of the compressor. For example, the length of the connecting rod, the radius of the linkage ring, the connection position of the connecting rod and the linkage ring, the included angle between the connecting rod and the linkage ring when the installation is completed, the connection position of the linkage ring and the rocker arm, the angle of the rocker arm relative to the casing, the length of the rocker arm, the initial value of the angle of the adjustable stator vane relative to the casing, etc. After obtaining the angle value of the adjustable stator vane relative to the casing, the real-time value of the structural parameters of the adjusting mechanism can be calculated based on the initial values of the structural parameters of the adjusting mechanism. Therefore, after obtaining the axial force of the connecting rod, the active balance torque applied to the adjustable stator vane can be calculated based on the axial force of the connecting rod combined with the real-time value of the structural parameters of the adjusting mechanism. This active balance torque is used to keep the adjustable stator vane in force balance, and the magnitude of the gas load received by the adjustable stator vane can be calculated based on the force balance state of the adjustable stator vane. When friction is not considered, the calculated active balance torque is the gas load.

[0044] The method for detecting the gas load of the adjustable stator vane of the compressor provided in this embodiment can conveniently and effectively calculate the gas load acting on the adjustable stator vane by detecting and obtaining the angle value of the adjustable stator vane rotating relative to the casing, and arranging a strain gauge on the connecting rod to detect and obtain the strain value in the axial direction of the connecting rod, and combining the structural parameters of the adjusting mechanism.

[0045] In some embodiments, calculating the gas load based on the angle value, the calculated axial force, and the structural parameters of the adjusting mechanism includes:

[0046] Calculate the tangential force acting on the end of the rocker arm by the adjusting mechanism in the swinging direction of the rocker arm based on the calculated axial force, angle value, and the structural parameters of the adjusting mechanism; in the illustrated embodiment, the adjusting mechanism includes a linkage ring, and the linkage ring is connected to the end of the rocker arm. The tangential force acting on the rocker arm in the swinging direction by the linkage ring can be calculated according to the real-time values of the axial force, angle value, and the structural parameters of the adjusting mechanism.

[0047] Calculate the active balance torque acting on the adjustable stator vane by the adjusting mechanism based on the calculated tangential force and the structural parameters of the rocker arm. Calculate the gas load based on the active balance torque. The active balance torque can be obtained by multiplying the tangential force by the moment arm of the tangential force with respect to the axis of the shaft of the adjustable stator vane. When friction resistance is not considered, when the adjustable stator vane is in force balance, the active balance torque is balanced with the gas load.

[0048] In some embodiments, calculating the gas load based on the active balance torque includes:

[0049] Obtain the frictional resistance moment between the adjusting mechanism and the adjustable stator vane, and calculate the gas load based on the active balance torque and the frictional resistance moment. In practice, the adjusting mechanism, the shaft of the adjustable stator vane, etc. are also affected by frictional resistance. When the adjustable stator vane is in force balance in the working state, the gas load on the adjustable stator vane is balanced with the sum of the active balance torque and the frictional resistance moment on the adjustable stator vane, that is, adding the active balance torque and the frictional resistance moment on the adjustable stator vane can obtain the magnitude of the gas load. By considering the frictional resistance moment in this embodiment, the calculation of the gas load can be made more accurate and reliable.

[0050] The frictional resistance moment can be obtained by measurement before the compressor operates. For example, after installing components such as the adjusting mechanism and the adjustable stator vane, apply a test moment to the adjustable stator vane at the end of the adjustable stator vane, and apply a driving force at the end of the adjusting mechanism to make the adjustable stator vane in force balance. According to the value of the driving force and the structural parameters of the adjusting mechanism, the active balance torque of the adjusting mechanism on the adjustable stator vane can be calculated. Then, based on the balance of the active balance torque, the test moment, and the frictional resistance moment, the frictional resistance moment can be calculated. When detecting the gas load of the adjustable stator vane during the operation of the compressor, it can be approximately considered that the magnitude of the frictional resistance moment on the adjustable stator vane remains unchanged and is the frictional resistance moment measured before the compressor operates.

[0051] In some embodiments, obtaining the strain value of the connecting rod by setting strain gauges on the connecting rod includes: as Figure 2 shown, forming a plane 100 by machining on the connecting rod or as Figure 3 shown, setting a structure with a plane 100 to arrange the strain gauge on the plane 100. As Figure 3As shown, a prism structure can be provided on the connecting rod, and the strain gauge can be provided on the plane 100 on the side of the prism structure. In this embodiment, the strain gauge can conveniently and reliably detect the strain in the axial direction of the connecting rod.

[0052] In some embodiments, the gas load of the adjustable stator vane is detected when the adjusting mechanism adjusts the angle of rotation of the adjustable stator vane relative to the casing. During the process of the adjusting mechanism adjusting the angle of rotation of the adjustable stator vane relative to the casing, it can be approximately considered that the adjustable stator vane is in a force equilibrium state. According to the angle value of the adjustable stator vane detected by the angle detection device and the measurement result of the strain gauge, the gas load of the adjustable stator vane during this process can be calculated in real time.

[0053] In some embodiments, the gas load of the adjustable stator vane is detected when the compressor is in a surge condition. Detecting the gas load of the adjustable stator vane in the surge condition helps to analyze the performance characteristics of the compressor in the surge condition.

[0054] In some embodiments, a compressor is also disclosed, which includes an adjustable stator vane, an adjusting mechanism, an angle detection device, a strain gauge, and a control device.

[0055] The adjustable stator vane is rotatably arranged on the casing of the compressor relative to the casing;

[0056] The adjusting mechanism is used to adjust the angle of rotation of the adjustable stator vane relative to the casing. The adjusting mechanism includes a rocker arm fixedly connected to the adjustable stator vane, a connecting rod connected to the rocker arm, and a driving device connected to the connecting rod. The driving device is configured to drive the rocker arm to swing by driving the connecting rod to adjust the angle of rotation of the adjustable stator vane relative to the casing.

[0057] The angle detection device is used to detect the angle value of the adjustable stator vane rotating relative to the casing;

[0058] The strain gauge is arranged on the connecting rod and is used to detect the strain value in the axial direction of the connecting rod;

[0059] The control device is signal-connected to the angle detection device and the strain gauge, and is configured to calculate the axial force of the connecting rod according to the strain value and the structural parameters of the connecting rod, and calculate the gas load according to the angle value, the calculated axial force, and the structural parameters of the adjusting mechanism.

[0060] In some embodiments, a plane 100 is provided on the connecting rod, and the strain gauge is arranged on the plane 100.

[0061] In some embodiments, the adjusting mechanism includes a driving device, a linkage ring connected to the rocker arm, and a connecting rod connected between the linkage ring and the driving device. In the embodiment shown in the figure, the driving device includes an actuating cylinder 17, and the actuating cylinder can adopt devices such as a pneumatic cylinder or a hydraulic cylinder. In the embodiment shown in the figure, the actuating cylinder 17 is connected to the torsion bar 18, the torsion bar 18 is connected to a plurality of connecting rods, and the plurality of connecting rods are indirectly connected to the rocker arm by connecting to the linkage ring. When adjusting the angle of the adjustable stator vane, the actuating cylinder 17 acts to drive the torsion bar 18 to twist, the torsion bar 18 twists to drive the connecting rod to act, the connecting rod drives the linkage ring to rotate, the linkage ring drives the rocker arm to swing, and the rocker arm drives the adjustable stator vane to adjust the angle.

[0062] In some embodiments, the control device described above can be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in the present invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for detecting the gas load of adjustable stator blades of a compressor, the adjustable stator blades are rotatably arranged on the casing of the compressor relative to the casing, the compressor includes an adjusting mechanism for adjusting the rotation angle of the adjustable stator blades relative to the casing, the adjusting mechanism includes a rocker arm fixedly connected to the adjustable stator blades and a connecting rod connected to the rocker arm, characterized in that, The detection method includes: Detecting and obtaining the angle value of the adjustable stator vane relative to the casing; Detecting and obtaining the strain value in the axial direction of the connecting rod by arranging a strain gauge on the connecting rod, and calculating the axial force of the connecting rod according to the strain value and the structural parameters of the connecting rod; Calculating the gas load according to the angle value, the calculated axial force and the structural parameters of the adjusting mechanism, including: calculating the tangential force in the swinging direction of the rocker arm acting on the end of the rocker arm by the adjusting mechanism according to the calculated axial force, the angle value and the structural parameters of the adjusting mechanism; calculating the active balance torque acting on the adjustable stator vane by the adjusting mechanism according to the calculated tangential force and the structural parameters of the rocker arm, and calculating the gas load according to the active balance torque.

2. The method for detecting the gas load of the adjustable stator vane of a compressor according to claim 1, characterized in that, Calculating the gas load according to the active balance torque includes: Obtaining the frictional torque between the adjusting mechanism and the adjustable stator vane, and calculating the gas load according to the active balance torque and the frictional torque.

3. The method for detecting the gas load of the adjustable stator vane of the compressor according to claim 1, characterized in that, Detecting and obtaining the strain value of the connecting rod by arranging a strain gauge on the connecting rod includes: forming a plane on the connecting rod by cutting or arranging a structure with a plane to arrange the strain gauge on the plane.

4. The method for detecting the gas load of the adjustable stator blades of a compressor according to any one of claims 1 to 3, characterized in that, Detecting the gas load of the adjustable stator vane when the compressor is in a surge condition.

5. The method for detecting the gas load of the adjustable stator vane of the compressor according to any one of claims 1 to 3, characterized in that, Detecting the gas load of the adjustable stator vane when the adjusting mechanism adjusts the rotation angle of the adjustable stator vane relative to the casing.

6. A compressor, characterized in that, Including: An adjustable stator vane rotatably arranged on the casing relative to the casing of the compressor; An adjusting mechanism for adjusting the rotation angle of the adjustable stator vane relative to the casing, including a rocker arm fixedly connected to the adjustable stator vane, a connecting rod connected to the rocker arm, and a driving device connected to the connecting rod, the driving device being configured to drive the connecting rod to drive the rocker arm to swing to adjust the rotation angle of the adjustable stator vane relative to the casing; An angle detection device for detecting the angle value of the adjustable stator vane relative to the casing; A strain gauge arranged on the connecting rod for detecting the strain value in the axial direction of the connecting rod; A control device is signal-connected to the angle detection device and the strain gauge, and is configured to calculate the axial force of the connecting rod according to the strain value and the structural parameters of the connecting rod, and calculate the gas load according to the angle value, the calculated axial force and the structural parameters of the adjusting mechanism, including: calculating the tangential force in the swinging direction of the rocker arm acting on the end of the rocker arm by the adjusting mechanism according to the calculated axial force, the angle value and the structural parameters of the adjusting mechanism; calculating the active balance torque acting on the adjustable stator vane by the adjusting mechanism according to the calculated tangential force and the structural parameters of the rocker arm, and calculating the gas load according to the active balance torque.

7. The compressor according to claim 6, characterized in that, A plane is provided on the connecting rod, and the strain gauge is arranged on the plane.

8. The compressor according to claim 6, characterized in that, The adjusting mechanism includes a driving device, a linkage ring connected to the rocker arm, and a connecting rod connected between the linkage ring and the driving device.

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