A throttling device for adjusting exhaust pressure loss

Abstract

The present application provides a throttling device capable of adjusting exhaust pressure loss, belonging to the technical field of aero-engine test. It includes: an outer casing and an inner casing, which together form an air flow passage. The front end of the air flow passage is connected to a compressor test piece, and the rear end is connected to an exhaust gas collector box; a driving device and a linkage ring installed on the outer casing, the driving device is connected to the linkage ring and used to drive the linkage ring to rotate relative to the outer casing; a plurality of blades arranged in the air flow passage, the upper and lower ends of the blades are respectively supported by an upper support mechanism and a lower support mechanism, the upper support mechanism passes through the outer casing and is connected to the linkage ring through a rocker arm, and the lower support mechanism is installed on the inner casing; the driving device drives the linkage ring to rotate, thereby driving the rocker arm to deflect, and finally controlling the rotation of the blades to achieve the control of the change in the exhaust flow area. The present application solves the problem that the exhaust pressure loss cannot be adjusted, and solves the problem of difficult exhaust during compressor tests under large flow rate and small pressure ratio characteristics.

Description

Technical Field

[0001] This application belongs to the field of aero-engine tests, and particularly relates to a throttling device capable of adjusting exhaust pressure loss. Background Art

[0002] The compressor surge margin recording test is an important part of the compressor test, and the exhaust throttling device is the key equipment for realizing surge recording during the compressor test. During the surge test, by gradually closing the throttling device at the compressor outlet and continuously increasing its outlet back pressure, the outlet pressure and flow rate data under the stable operating limit state of the compressor are obtained, that is, the surge margin recording is realized. The throttling device for adjusting the compressor exhaust pressure mainly undertakes two tasks: one is to accurately control the flow area at the compressor outlet; the other is that after the compressor surges, the throttling device needs to have a fast opening function to enable the compressor to return to normal and avoid accidents.

[0003] The common throttling devices in the prior art are divided into two types: one is a butterfly disk type annular valve with a moving and static ring structure, and the other is a pipeline quick-opening and closing valve in the circular pipe channel behind the air collecting volute.

[0004] The above two throttling devices have the following defects:

[0005] 1) The butterfly disk type annular valve has outstanding full-stroke adjustment ability and high linearity in the compressor test, but due to its structural form limitation, the blockage ratio in the fully open state is not fixed, and the flow loss of the valve in this state is not adjustable;

[0006] 2) The adjustment law of the flow area of the quick-opening and closing valve is fixed, and its adjustment ability in the initial and final sections of the adjustment in the compressor test is not good. Especially near the compressor surge point, a small adjustment amount will cause a large change in the test state, which cannot meet the precise requirements of the surge test; the valve plate of the quick-opening and closing valve has a certain thickness. In the fully open state, the thickness reduces the flow area of the flow channel by about 20%, resulting in a large exhaust pressure loss, and it is not adjustable, which is not conducive to the discharge of air flow in the large flow rate and small pressure ratio state. Summary of the Invention

[0007] The purpose of this application is to provide a throttling device capable of adjusting exhaust pressure loss to solve or alleviate at least one problem in the background art.

[0008] The technical solution of this application is: a throttling device capable of adjusting exhaust pressure loss, including:

[0009] An outer casing and an inner casing, the outer casing and the inner casing form an air flow channel, the front end of the air flow channel is connected to the compressor test piece, and the rear end is connected to the exhaust gas collecting box;

[0010] A drive device and a linkage ring mounted on an outer casing, the drive device being connected to the linkage ring for driving the linkage ring to rotate relative to the outer casing;

[0011] A plurality of vanes disposed in an air flow passage, upper and lower ends of the vanes being supported by an upper support mechanism and a lower support mechanism respectively, the upper support mechanism passing through the outer casing and being connected to the linkage ring through a rocker arm, the lower support mechanism being mounted on an inner casing;

[0012] By driving the linkage ring to rotate through the drive device, the linkage ring drives the rocker arm to deflect, thereby controlling the rotation of the vanes and realizing the control of the change in the exhaust flow area.

[0013] Preferably, the outer casing and the inner casing are fixedly connected by a support plate, connection flanges for connecting a compressor test piece and an exhaust gas collector are provided at the front and rear ends of the outer casing, and seal grooves for installing sealing rings are provided at the front and rear ends of the inner casing, and the seal grooves are adapted to the compressor test piece and the exhaust gas collector.

[0014] Preferably, the drive device includes an electric drive device and a hydraulic drive device for providing driving force.

[0015] Preferably, when the drive device outputs a linear driving force, the drive device is hinged to the outer casing to ensure that the driving force exerted by the drive device on the linkage ring is always tangent to the linkage ring.

[0016] Preferably, the linkage ring and the rocker arm are connected by a connecting member, and at least a part of the connecting member protrudes from the linkage ring, and a circumferential positioning groove is provided on the outer casing, and the connecting member protruding from the linkage ring is adapted to the circumferential positioning groove for realizing the connection and positioning of the linkage ring and the outer casing.

[0017] Preferably, the structural forms of the vanes include straight vanes, curved vanes and twisted vanes.

[0018] Preferably, the materials of the vanes include metal materials and ceramic matrix composites.

[0019] Preferably, the upper support mechanism includes an upper mounting seat, an upper pin shaft, an upper support bearing, an upper cover plate and an upper locking pin. An upper mounting seat mounting groove is provided on the outer casing, the upper mounting seat is disposed in the upper mounting seat mounting groove, the lower side of the upper mounting seat is connected to the vane through an upper pin shaft passing through the upper end of the vane and an upper split pin, and the upper side of the upper mounting seat is connected to the rocker arm; the upper support bearing is disposed in the upper mounting seat mounting groove and is supported on the outer side of the upper mounting seat; the upper cover plate is mounted on the outer casing at a position adapted to the upper mounting seat mounting groove and the upper mounting seat passes through the upper cover plate, and the upper cover plate is fixedly connected to the outer casing through an upper locking pin for limiting the upper support bearing in the upper mounting seat mounting groove.

[0020] Preferably, the lower support mechanism includes a lower mounting base, a lower pin shaft, a lower support bearing, a lower cover plate and a lower locking pin. An installation groove for the lower mounting base is provided on the inner casing. The lower mounting base is arranged in the installation groove for the lower mounting base. The upper side of the lower mounting base is connected to the blade through the lower pin shaft passing through the lower end of the blade and a lower split pin. The lower side of the lower mounting base is lower than the lower surface of the inner casing. The lower support bearing is arranged in the installation groove for the lower mounting base and is supported and installed on the outer side of the lower mounting base. The lower cover plate is installed in the installation groove for the lower mounting base and is connected to the lower end of the lower mounting base through the lower locking pin, and is used for limiting the lower support bearing in the installation groove for the lower mounting base.

[0021] Preferably, the exhaust area of the air flow passage is increased or decreased by disassembling or installing the blades circumferentially and uniformly, so as to adjust the exhaust pressure loss of the air flow passing through the blades.

[0022] The throttling device capable of adjusting the exhaust pressure loss provided by the present application forms a louver structure by arranging a plurality of independent blades and is driven by the intake of the linkage ring. The blades can be disassembled and assembled in any combination state, without affecting the normal opening and closing functions of other blades, solving the problem that the exhaust pressure loss of the throttling device cannot be adjusted, and solving the problem of difficult exhaust during the compressor test under the characteristics of large flow rate and small pressure ratio. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions provided by the present application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application.

[0024] Figure 1 It is a schematic diagram of the test position of the throttling device capable of adjusting the exhaust pressure loss of the present application.

[0025] Figure 2 It is a general schematic diagram of the test of the throttling device capable of adjusting the exhaust pressure loss of the present application.

[0026] Figure 3 It is an axial schematic diagram of the test of the throttling device capable of adjusting the exhaust pressure loss of the present application.

[0027] Figure 4 It is a schematic diagram of the blade mounting structure in the present application.

[0028] Figure 5 It is a simplified diagram of the blade mounting structure in the present application. Detailed Description of the Embodiments

[0029] In order to make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

[0030] In order to overcome the disadvantages of the butterfly disk type annular valve or the quick-opening valve in the prior art, the present application provides a throttling device capable of adjusting the exhaust pressure loss, which has a high switching linearity and adjustable pressure loss, and can solve the problem of difficult exhaust in the compressor test under the characteristics of large flow rate and small pressure ratio.

[0031] As Figures 1 to 5 shown, the throttling device 20 capable of adjusting the exhaust pressure loss provided by the present application is arranged between the compressor test piece 10 and the exhaust gas collecting box 30. The throttling device 20 includes: an outer casing 21, an inner casing 22, a driving device 23, a linkage ring 24, a rocker arm 25 and a plurality of blades 26.

[0032] The outer casing 21 and the inner casing 22 form an air flow channel, the front end of which is connected to the outer and inner casings of the compressor test piece 10, and the rear end of which is connected to the exhaust gas collecting box 30. In some embodiments of the present application, connection flanges can be respectively arranged at the front end and the rear end of the outer casing 21 for connecting to the compressor test piece 10 and the exhaust gas collecting box 30 respectively; sealing grooves are respectively arranged at the front end and the rear end of the inner casing 22, sealing gaskets are arranged in the sealing grooves, and the front end and the rear end of the inner casing 22 are respectively abutted against the compressor test piece 10 and the exhaust gas collecting box 30, so as to achieve a sealed connection. The inner casing 22 is connected to the outer casing 21 through support plates, so as to fix the inner casing 22 and the outer casing 21. It can be understood that the number of support plates used for connecting between the inner casing 22 and the outer casing 21 can be set as required. For example, in the Figure 3 embodiment shown in the present application, 6 support plates are provided.

[0033] The driving device 23 is arranged on the outer casing 21 and is used to drive the linkage ring 24 to rotate. In the present application, a driving device mounting seat is arranged on the outer casing 21, and the driving device 23 is connected to the driving device mounting seat. In some embodiments of the present application, the driving device 23 can be an electric driving device - such as a linear stepper motor or a linear servo motor. By adopting an electric driving device, higher control accuracy and fast response speed can be achieved. In some other embodiments of the present application, the driving device 23 can be a hydraulic driving device - such as a hydraulic cylinder or a hydraulic motor, so as to output a larger torque and achieve a higher load. Preferably, when the driving device 23 is a linear driving device, the driving device 23 is arranged to be able to rotate within a small range relative to the driving device mounting seat to ensure that the driving force applied by the driving device 23 to the linkage ring 24 is always tangent to the linkage ring 24.

[0034] Twenty-four linkage rings 24 are sleeved on the outer casing 21, which connect the driving device 23 and the rocker arm 25, and are used to transmit the output force of the driving device 23 to the blade 26 through the rocker arm 25. In some embodiments of the present application, a circumferential positioning groove is provided on the outer casing 21, and the linkage ring 24 is arranged at a position adapted to the circumferential positioning groove. The two are connected by a connecting piece passing through the rocker arm 25 and the linkage ring 24, and the lower end of the connecting piece protrudes from the linkage ring 24 by a part to form a positioning protrusion, and the positioning protrusion is installed in the circumferential positioning groove, so as to realize the connection and positioning of the linkage ring 24 and the outer casing 21.

[0035] The blade 26 is arranged in the air flow channel formed by the outer casing 21 and the inner casing 22. Upper support mechanisms 27 and lower support mechanisms 28 are respectively arranged at the upper and lower ends of the blade 26. The upper support mechanism 27 passes through the outer casing 21 and is connected to the rocker arm 25, and the lower support mechanism 28 is installed on the inner casing 22 and is used to support the blade 26. In some embodiments of the present application, the structural form of the blade 26 can be various forms such as straight blades, curved blades, and twisted blades, which can be selected according to needs. Further, the material of the blade 26 can be selected from metal materials - such as titanium alloy or superalloy, etc., or ceramic matrix composites - such as zirconia ceramics or silicon carbide ceramics, etc., which will not be elaborated here.

[0036] The driving device 23 is connected to the blade 26 through the linkage ring 24 and the rocker arm 25. The driving device 23 drives the linkage ring 24 to rotate, the linkage ring 24 drives the rocker arm 25 to deflect, and the rocker arm 25 further drives the blade 26 to rotate around its axis (usually the fully open state of the blade 26 is 0 degrees, and the fully closed state of the blade 26 is rotated 90 degrees), so as to realize the blockage and opening of the exhaust flow area (that is Figure 3 the change between state A and state B in the figure), and realize the change control of the exhaust flow area.

[0037] As Figure 4 and Figure 5 shown, the upper support mechanism 27 in the present application includes an upper mounting seat 271, an upper pin shaft 272, an upper support bearing 273, an upper cover plate 274 and an upper locking pin 275. An upper mounting seat mounting groove is provided on the outer casing 21, and the upper mounting seat 271 is arranged in the upper mounting seat mounting groove. The lower side of the upper mounting seat 271 is connected to the blade 26 through the upper pin shaft 272 passing through the upper end of the blade 26 and the upper split pin 276, and the upper side of the upper mounting seat 271 is connected to the rocker arm 25. The upper support bearing 273 is arranged in the upper mounting seat mounting groove and is supported and installed on the outside of the upper mounting seat 271. The upper cover plate 274 is installed on the outer casing 21 at a position adapted to the upper mounting seat mounting groove and the upper mounting seat 271 passes through the upper cover plate 274. The upper cover plate 274 is fixedly connected to the outer casing 21 through the upper locking pin 275 passing through it, and is used to limit the upper support bearing 273 in the upper mounting seat mounting groove.

[0038] Similarly, the lower support mechanism 28 in the present application includes a lower mounting base 281, a lower pin shaft 282, a lower support bearing 283, a lower cover plate 284, and a lower locking pin 285. An installation groove for the lower mounting base is provided on the inner casing 22, and the lower mounting base 281 is arranged in the installation groove for the lower mounting base. The upper side of the lower mounting base 281 is connected to the blade 26 through the lower pin shaft 282 passing through the lower end of the blade 26 and the lower split pin 286, and its lower side is lower than the lower surface of the inner casing 22 by a certain height. The lower support bearing 283 is arranged in the installation groove for the lower mounting base and is supported and installed on the outer side of the lower mounting base 281. The lower cover plate 284 is installed in the installation groove for the lower mounting base and is connected to the lower end of the lower mounting base 281 through the lower locking pin 285 passing through it, and is used to limit the lower support bearing 283 in the installation groove for the lower mounting base.

[0039] In some embodiments of the present application, a sealing ring or a sealing gasket can be arranged between the upper cover plate 274 and the upper mounting base 271, and between the lower cover plate 284 and the inner casing 22 to improve the sealing performance.

[0040] As Figure 4 shown is a schematic diagram of the blade installation structure in the fully open state of the throttling device in the present application. In the fully open state (i.e., the included angle between the blade 26 and the axis of the compressor is 0 degrees), the area ratio of each blade 26 to the exhaust passage area is about 0.42%. When there are 32 blades 26, the area ratio of the blades 26 to the exhaust passage area is 32 * 0.42% ≈ 13%. In order to ensure that the air flow with large flow rate and low outlet pressure can be discharged smoothly and reduce the loss of the air flow passing through the throttling device, in the present application, the exhaust area of the air flow passage can be increased or decreased by circumferentially and uniformly disassembling or installing some of the blades 26, so as to adjust the exhaust pressure loss of the air flow passing through the blades.

[0041] Combined Figure 4 and Figure 5 shown, the process of disassembling and assembling the blade 26 in the throttling device 20 of the present application is as follows:

[0042] 1) According to the exhaust characteristics of the compressor test piece 10, perform simulation calculations to obtain the number of blades 26 to be removed, the angular position information, etc.;

[0043] 2) Adjust the blade 26 to the fully open state position (0 degrees), determine the blades 26 to be removed, and make marks;

[0044] 3) Select one of the blades 26 and remove the upper split pin 276 and the lower split pin 286 connected to it;

[0045] 4) Pull out the upper pin shaft 272 and the lower pin shaft 282, and take out the blade 26;

[0046] 5) Repeat the above process to disassemble other blades 26.

[0047] The throttling device capable of adjusting the exhaust pressure loss provided by the present application forms a louver structure by arranging a plurality of independent blades 26, and is driven by the intake of the linkage ring 24. The blades 26 can be disassembled and assembled in any combination state, without affecting the normal opening and closing functions of other blades 26, solving the problem that the exhaust pressure loss of the existing throttling device cannot be adjusted, and solving the problem of difficult exhaust during the compressor test under the characteristics of large flow rate and small pressure ratio.

[0048] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A throttling device capable of adjusting exhaust pressure loss, characterized in that, Comprising: An outer casing and an inner casing, the outer casing and the inner casing forming an air flow passage, the front end of the air flow passage being connected to a compressor test piece and the rear end being connected to an exhaust gas collecting box; A driving device and a linkage ring mounted on the outer casing, the driving device being connected to the linkage ring for driving the linkage ring to rotate relative to the outer casing; A plurality of blades arranged in the air flow passage, the upper end and the lower end of the blade being respectively supported by an upper support mechanism and a lower support mechanism, the upper support mechanism passing through the outer casing and being connected to the linkage ring through a rocker arm, and the lower support mechanism being mounted on the inner casing; By driving the linkage ring to rotate through the driving device, the linkage ring drives the rocker arm to deflect, thereby controlling the rotation of the blade and realizing the control of the change of the exhaust gas flow area; Wherein, the upper support mechanism includes an upper mounting seat, an upper pin shaft, an upper support bearing, an upper cover plate and an upper locking pin, an upper mounting seat mounting groove is provided on the outer casing, the upper mounting seat is arranged in the upper mounting seat mounting groove, the lower side of the upper mounting seat is connected to the blade through an upper pin shaft passing through the upper end of the blade and an upper split pin, and the upper side of the upper mounting seat is connected to the rocker arm; the upper support bearing is arranged in the upper mounting seat mounting groove and is supported and mounted on the outer side of the upper mounting seat; the upper cover plate is mounted on the outer casing at a position adapted to the upper mounting seat mounting groove and the upper mounting seat passes through the upper cover plate, and the upper cover plate is fixedly connected to the outer casing through an upper locking pin for limiting the upper support bearing in the upper mounting seat mounting groove; The lower support mechanism includes a lower mounting seat, a lower pin shaft, a lower support bearing, a lower cover plate and a lower locking pin, a lower mounting seat mounting groove is provided on the inner casing, the lower mounting seat is arranged in the lower mounting seat mounting groove, the upper side of the lower mounting seat is connected to the blade through a lower pin shaft passing through the lower end of the blade and a lower split pin, the lower side of the lower mounting seat is lower than the lower surface of the inner casing, the lower support bearing is arranged in the lower mounting seat mounting groove and is supported and mounted on the outer side of the lower mounting seat; the lower cover plate is mounted in the lower mounting seat mounting groove and is connected to the lower end of the lower mounting seat through a lower locking pin for limiting the lower support bearing in the lower mounting seat mounting groove.

2. The throttling device for adjusting exhaust pressure loss according to claim 1, wherein The outer casing and the inner casing are connected and fixed through a support plate, connection flanges for connecting the compressor test piece and the exhaust gas collecting box are provided at the front end and the rear end of the outer casing, and sealing grooves for installing sealing rings are provided at the front end and the rear end of the inner casing, and the sealing grooves are adapted to the compressor test piece and the exhaust gas collecting box.

3. The throttling device for adjusting exhaust pressure loss according to claim 1, characterized in that, The driving device includes an electric driving device and a hydraulic driving device for providing driving force.

4. The throttling device for adjusting exhaust pressure loss according to claim 3, characterized in that, When the driving device outputs a linear driving force, the driving device is hinged to the outer casing to ensure that the driving force applied by the driving device to the linkage ring is always tangent to the linkage ring.

5. The throttling device for adjusting exhaust pressure loss according to claim 4, wherein The linkage ring and the rocker arm are connected through a connecting member, and at least part of the connecting member protrudes from the linkage ring, and a circumferential positioning groove is provided on the outer casing, and the connecting member protruding from the linkage ring is adapted to the circumferential positioning groove for realizing the connection and positioning of the linkage ring and the outer casing.

6. The throttling device for adjusting exhaust pressure loss according to claim 1, characterized in that, The structural forms of the blades include straight blades, curved blades and twisted blades.

7. The throttling device for adjusting exhaust pressure loss according to claim 6, characterized in that, The materials of the blades include metallic materials and ceramic matrix composites.

8. The throttling device for adjusting exhaust pressure loss according to any one of claims 1 to 7, characterized in that, By uniformly disassembling or installing the blades circumferentially, the exhaust area of the air flow passage is increased or decreased, thereby adjusting the exhaust pressure loss of the air flow passing through the blades.

Images