Throttling device capable of adjusting exhaust pressure loss

Abstract

The invention provides a throttling device capable of adjusting exhaust pressure loss, and belongs to the technical field of aero-engine tests, and the throttling device comprises an outer casing and an inner casing which form an airflow channel, the front end of the airflow channel is connected with a gas compressor test piece, and the rear end of the airflow channel is connected with an exhaust gas collection box; the driving device and the linkage ring are installed on the outer casing, and the driving device is connected with the linkage ring and used for driving the linkage ring to rotate relative to the outer casing; the blades are arranged in the airflow channel, the upper ends and the lower ends of the blades are supported through an upper supporting mechanism and a lower supporting mechanism respectively, the upper supporting mechanism penetrates through the outer casing and is connected with the linkage ring through a rocker arm, and the lower supporting mechanism is installed on the inner casing; the driving device drives the linkage ring to rotate, then the rocker arm is driven to deflect, finally the blades are controlled to rotate, and change control over the exhaust flow area is achieved. The problem that the exhaust pressure loss cannot be adjusted is solved, and the problem that exhaust is difficult when the gas compressor is tested under the characteristics of large flow and small pressure ratio is solved.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine testing, and in particular relates to a throttling device capable of adjusting exhaust pressure loss. Background Art

[0002] The compressor surge boundary admission test is an important part of the compressor test, and the exhaust throttling device is the key equipment to achieve surge admission during the compressor test. In the surge test, the compressor outlet throttling device is gradually closed to continuously increase its outlet back pressure, and the outlet pressure and flow data of the compressor under the stable working limit state are obtained, that is, the surge boundary admission is achieved. The throttling device that adjusts the compressor exhaust pressure mainly undertakes two tasks: one is to accurately control the compressor outlet flow area; the other is that after the compressor surges, the throttling device needs to have a quick opening function to restore the compressor to normal and avoid accidents.

[0003] There are two common throttling devices in the prior art: one is a butterfly disc type annular valve with a dynamic and static ring structure, and the other is a pipeline rapid switching valve in the circular pipe channel behind the air collecting volute.

[0004] The above two throttling devices have the following defects: 1) The butterfly disc annular valve has outstanding full stroke adjustment ability and high linearity in the compressor test, but due to its structural form, the blockage ratio in the fully open state is not fixed, and the flow loss of the valve in this state cannot be adjusted; 2) The regulation rules of the flow area of ​​the fast-opening and closing valves are fixed. The adjustment capabilities of the initial and final stages in the compressor test are poor, especially near the compressor surge point. A slight adjustment will cause a large change in the test state, which cannot meet the precise requirements of the surge test. The valve plate of the fast-opening and closing valves 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, which cannot be adjusted and is not conducive to the discharge of airflow in large flow and small pressure ratio states. Summary of the invention

[0005] The purpose of the present application is to provide a throttling device capable of adjusting exhaust pressure loss, so as to solve or alleviate at least one problem in the background technology.

[0006] The technical solution of the present application is: a throttling device capable of adjusting exhaust pressure loss, comprising: An outer casing and an inner casing, wherein 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 of the air flow channel is connected to the exhaust air collecting box; A driving device and a linkage ring installed on the outer casing, wherein the driving device is connected to the linkage ring and is used to drive the linkage ring to rotate relative to the outer casing; A plurality of blades are arranged in the airflow channel, wherein the upper end and the lower end of the blade are supported by an upper supporting mechanism and a lower supporting mechanism respectively, the upper supporting mechanism passes through the outer casing and is connected to the linkage ring through a rocker arm, and the lower supporting mechanism is installed on the inner casing; The linkage ring is driven to rotate by the driving device, and the linkage ring drives the rocker arm to deflect, thereby controlling the rotation of the blades to achieve the change control of the exhaust flow area.

[0007] Preferably, the outer casing is connected and fixed to the inner casing by a support plate, the front and rear ends of the outer casing are provided with connecting flanges for connecting the compressor test piece and the exhaust air collecting box, the front and rear ends of the inner casing are provided with sealing grooves for installing sealing rings, and the sealing grooves are adapted to the compressor test piece and the exhaust air collecting box.

[0008] Preferably, the driving device comprises an electric driving device and a hydraulic driving device for providing driving force.

[0009] Preferably, 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.

[0010] Preferably, the linkage ring is connected to the rocker arm via a connecting piece, and the connecting piece at least partially protrudes from the linkage ring. A circumferential positioning groove is provided on the outer casing, and the connecting piece protruding from the linkage ring is adapted to the circumferential positioning groove to achieve connection and positioning between the linkage ring and the outer casing.

[0011] Preferably, the structural forms of the blades include straight blades, curved blades and twisted blades.

[0012] Preferably, the material of the blade includes metal material and ceramic-based composite material.

[0013] Preferably, the upper supporting mechanism includes an upper mounting seat, an upper pin shaft, an upper supporting bearing, an upper cover plate and an upper locking pin. An upper mounting seat mounting groove is provided on the outer casing, and the upper mounting seat is arranged in the upper mounting seat mounting groove. The lower side of the upper mounting seat is connected with the blade by an upper pin shaft passing through the upper end of the blade and an upper cotter pin, and the upper side of the upper mounting seat is connected to the rocker arm; the upper supporting bearing is arranged in the upper mounting seat mounting groove, and the support is installed on the outer side of the upper mounting seat; the upper cover plate is installed on the outer casing adapted to the position of 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 by the upper locking pin, which is used to limit the upper supporting bearing in the upper mounting seat mounting groove.

[0014] Preferably, the lower supporting mechanism includes a lower mounting seat, a lower pin shaft, a lower supporting bearing, a lower cover plate and a lower locking pin. A lower mounting seat mounting groove is provided on the inner casing, and the lower mounting seat is arranged in the lower mounting seat mounting groove. The upper side of the lower mounting seat is connected with the blade by the lower pin shaft and the lower opening pin passing through the lower end of the blade. The lower side of the lower mounting seat is lower than the lower surface of the inner casing. The lower supporting bearing is arranged in the lower mounting seat mounting groove and is supported and installed on the outer side of the lower mounting seat; the lower cover plate is installed in the lower mounting seat mounting groove and is connected to the lower end head of the lower mounting seat through the lower locking pin, so as to limit the lower supporting bearing in the lower mounting seat mounting groove.

[0015] Preferably, the exhaust pressure loss of the exhaust gas flowing through the blades is adjusted by uniformly removing or installing the blades in the circumferential direction to increase or decrease the exhaust area of ​​the air flow channel.

[0016] The throttling device with adjustable exhaust pressure loss provided in the present application forms a shutter-type structure by arranging multiple independent blades and is driven by the linkage ring intake. The blades can be disassembled and assembled in any combination state without affecting the normal switching function of other blades, thereby solving the problem that the exhaust pressure loss of the throttling device cannot be adjusted and solving the problem that the exhaust is difficult when the compressor test has large flow and small pressure ratio characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0018] Figure 1 This is a schematic diagram of the test position of the throttling device capable of adjusting the exhaust pressure loss of the present application.

[0019] Figure 2 This is a schematic diagram of the overall test of the throttling device capable of adjusting the exhaust pressure loss of the present application.

[0020] Figure 3 This is an axial schematic diagram of a throttling device test capable of adjusting exhaust pressure loss according to the present application.

[0021] Figure 4 This is a schematic diagram of the blade installation structure in this application.

[0022] Figure 5 This is a simplified diagram of the blade mounting structure in this application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0024] In order to overcome the shortcomings of butterfly disc annular valves or fast switching valves in the prior art, the present application provides a throttling device with adjustable exhaust pressure loss, which has high switching linearity and adjustable pressure loss, and can solve the problem of difficult exhaust in compressor tests with large flow and small pressure ratio characteristics.

[0025] like Figures 1 to 5 As shown, the throttling device 20 with adjustable exhaust pressure loss provided in the present application is arranged between the compressor test piece 10 and the exhaust air collecting box 30, and 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.

[0026] The outer casing 21 and the inner casing 22 form an air flow channel, the front end of which is connected to the inner and outer casings of the compressor test piece 10, and the rear end of which is connected to the exhaust air collecting box 30. In some embodiments of the present application, connecting flanges may be provided at the front and rear ends of the outer casing 21, respectively, for connecting to the compressor test piece 10 and the exhaust air collecting box 30, respectively; sealing grooves are provided at the front and rear ends of the inner casing 22, respectively, and sealing gaskets are provided in the sealing grooves, and the front and rear ends of the inner casing 22 are respectively abutted against the compressor test piece 10 and the exhaust air collecting box 30, thereby achieving a sealed connection. The inner casing 22 is connected to the outer casing 21 through a support plate, thereby achieving the fixation of the inner casing 22 to the outer casing 21. It can be understood that the number of support plates used to connect the inner casing 22 and the outer casing 21 can be set as needed. For example, in the present application, Figure 3 In the illustrated embodiment, six support plates are provided.

[0027] The drive 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 drive device mounting seat is provided on the outer casing 21, and the drive device 23 is connected to the drive device mounting seat. In some embodiments of the present application, the drive device 23 can be an electric drive device, such as a linear stepper motor or a linear servo motor, and a higher control accuracy and a fast response speed can be achieved by adopting the electric drive device. In some other embodiments of the present application, the drive device 23 can be a hydraulic drive device, such as a hydraulic cylinder or a hydraulic motor, so that a larger torque can be output and a higher load can be achieved. Preferably, when the drive device 23 is a linear drive device, the drive device 23 is arranged to be able to rotate in a small range relative to the drive device mounting seat to ensure that the driving force applied by the drive device 23 to the linkage ring 24 is always tangent to the linkage ring 24.

[0028] The linkage ring 24 is sleeved on the outer casing 21, and is connected to the driving device 23 and the rocker arm 25, and is 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, and 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 a part of the linkage ring 24, thereby forming 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.

[0029] The blade 26 is arranged in the air flow channel formed by the outer casing 21 and the inner casing 22, and an upper supporting mechanism 27 and a lower supporting mechanism 28 are respectively provided at the upper and lower ends thereof. The upper supporting mechanism 27 passes through the outer casing 21 and is connected to the rocker arm 25, and the lower supporting mechanism 28 is installed on the inner casing 22 to support the blade 26. In some embodiments of the present application, the structural form of the blade 26 can be a straight blade, a curved blade, a twisted blade, etc., which can be selected according to needs. Furthermore, the material of the blade 26 can be a metal material, such as a titanium alloy or a high-temperature alloy, or a ceramic-based composite material, such as a zirconium oxide ceramic or a silicon carbide ceramic, etc., which will not be repeated here.

[0030] 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, and the linkage ring 24 drives the rocker arm 25 to deflect. The rocker arm 25 then drives the blade 26 to rotate around its axis (usually the blade 26 is 0 degrees when it is fully open, and 90 degrees when it is fully closed), thereby achieving the blockage and opening of the exhaust gas flow area (i.e. Figure 3 The change between state A and state B in the exhaust gas flow area is realized by controlling the change of the exhaust gas flow area.

[0031] like Figure 4 and Figure 5 As shown, the upper support mechanism 27 in the present application includes an upper mounting seat 271, an upper pin 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 272 passing through the upper end of the blade 26 and the upper cotter 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 outer side of the upper mounting seat 271. The upper cover plate 274 is installed on the outer casing 21 adapted to the position of 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.

[0032] Similarly, the lower support mechanism 28 in the present application includes a lower mounting seat 281, a lower pin 282, a lower support bearing 283, a lower cover plate 284 and a lower locking pin 285. The inner casing 22 is provided with a lower mounting seat mounting groove, and the lower mounting seat 281 is arranged in the lower mounting seat mounting groove. The upper side of the lower mounting seat 281 is connected to the blade 26 through the lower pin 282 passing through the lower end of the blade 26 and the lower cotter pin 286, and the lower side thereof is lower than the lower surface of the inner casing 22 by a certain height. The lower support bearing 283 is arranged in the lower mounting seat mounting groove, and is supported and installed on the outer side of the lower mounting seat 281. The lower cover plate 284 is installed in the lower mounting seat mounting groove, and is connected to the lower end of the lower mounting seat 281 through the lower locking pin 285 passing through it, so as to limit the lower support bearing 283 in the lower mounting seat mounting groove.

[0033] In some embodiments of the present application, sealing rings or sealing rubber pads may be provided between the upper cover plate 274 and the upper mounting seat 271 and between the lower cover plate 284 and the inner casing 22 to improve the sealing performance.

[0034] like Figure 4 The figure shows the 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 angle between the blade 26 and the compressor axis is 0 degrees), each blade 26 accounts for about 0.42% of the exhaust flow channel area. When 32 blades 26 are installed, the ratio of the blade 26 to the exhaust flow channel area is 32*0.42%≈13%. In order to ensure that the airflow with large flow and low outlet pressure can be discharged smoothly and reduce the loss of the flow through the throttling device, the present application can increase or decrease the exhaust area of ​​the airflow channel by evenly disassembling or installing some blades 26 in the circumferential direction, thereby adjusting the exhaust pressure loss of the flow through the blades.

[0035] Combination Figure 4 and Figure 5 As shown, the process of disassembling and assembling the blade 26 in the throttling device 20 of the present application is as follows: 1) According to the exhaust characteristics of the compressor test piece 10, simulation calculation is performed to obtain the number and angular position information of the removed blades 26; 2) Adjust the blade 26 to the fully open position (0 degrees), determine the blade 26 that needs to be removed, and mark it; 3) Select one of the blades 26 and remove the upper cotter pin 276 and the lower cotter pin 286 connected thereto; 4) Pull out the upper pin 272 and the lower pin 282, and remove the blade 26; 5) Repeat the above process to disassemble other blades 26.

[0036] The throttling device with adjustable exhaust pressure loss provided in the present application forms a shutter-type structure by arranging a plurality of independent blades 26 and is driven by the linkage ring 24 for air intake. The blades 26 can be disassembled and assembled in any combination state without affecting the normal switching function of other blades 26, thereby solving the problem that the exhaust pressure loss of the existing throttling device cannot be adjusted and solving the problem that the compressor is difficult to exhaust when the compressor is tested with large flow and small pressure ratio characteristics.

[0037] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A throttling device capable of adjusting exhaust pressure loss, characterized in that: include: An outer casing and an inner casing, wherein 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 of the air flow channel is connected to the exhaust air collecting box; A driving device and a linkage ring installed on the outer casing, wherein the driving device is connected to the linkage ring and is used to drive the linkage ring to rotate relative to the outer casing; A plurality of blades are arranged in the airflow channel, wherein the upper end and the lower end of the blade are supported by an upper supporting mechanism and a lower supporting mechanism respectively, the upper supporting mechanism passes through the outer casing and is connected to the linkage ring through a rocker arm, and the lower supporting mechanism is installed on the inner casing; The linkage ring is driven to rotate by the driving device, and the linkage ring drives the rocker arm to deflect, thereby controlling the rotation of the blades to achieve the change control of the exhaust flow area.

2. The throttling device capable of adjusting exhaust pressure loss according to claim 1, characterized in that: The outer casing is connected and fixed to the inner casing by a support plate. The front end and rear end of the outer casing are provided with connecting flanges for connecting the compressor test piece and the exhaust air collecting box. The front end and rear end of the inner casing are provided with sealing grooves for installing sealing rings. The sealing grooves are adapted to the compressor test piece and the exhaust air collecting box.

3. The throttling device capable of adjusting exhaust pressure loss according to claim 1, characterized in that: The driving device comprises an electric driving device and a hydraulic driving device, which are used to provide driving force.

4. The throttling device capable of 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 capable of adjusting exhaust pressure loss according to claim 4, characterized in that: The linkage ring is connected to the rocker arm through a connecting piece, and the connecting piece at least partially protrudes from the linkage ring. A circumferential positioning groove is provided on the outer casing, and the connecting piece protruding from the linkage ring is adapted to the circumferential positioning groove to achieve connection and positioning between the linkage ring and the outer casing.

6. The throttling device capable of 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 capable of adjusting exhaust pressure loss according to claim 6, characterized in that: The material of the blade includes metal material and ceramic-based composite material.

8. The throttling device capable of adjusting exhaust pressure loss according to claim 6, characterized in that: The upper supporting mechanism includes an upper mounting seat, an upper pin shaft, an upper supporting bearing, an upper cover plate and an upper locking pin. An upper mounting seat mounting groove is provided on the outer casing, and the upper mounting seat is arranged in the upper mounting seat mounting groove. The lower side of the upper mounting seat is connected with the blade by an upper pin shaft passing through the upper end of the blade and an upper cotter pin, and the upper side of the upper mounting seat is connected with the rocker arm; the upper supporting bearing is arranged in the upper mounting seat mounting groove, and the support is installed on the outer side of the upper mounting seat; the upper cover plate is installed on the outer casing adapted to the position of 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 by the upper locking pin, which is used to limit the upper supporting bearing in the upper mounting seat mounting groove.

9. The throttling device capable of adjusting exhaust pressure loss according to claim 8, characterized in that: The lower supporting mechanism includes a lower mounting seat, a lower pin shaft, a lower supporting 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 with the blade by the lower pin shaft passing through the lower end of the blade and the lower cotter pin. The lower side of the lower mounting seat is lower than the lower surface of the inner casing. The lower supporting bearing is arranged in the lower mounting seat mounting groove and is supported and installed on the outer side of the lower mounting seat. The lower cover plate is installed in the lower mounting seat mounting groove and is connected to the lower end head of the lower mounting seat through the lower locking pin, which is used to limit the lower supporting bearing in the lower mounting seat mounting groove.

10. The throttling device capable of adjusting exhaust pressure loss according to any one of claims 1 to 9, characterized in that: The exhaust pressure loss of the exhaust gas flowing through the blades is adjusted by evenly removing or installing the blades in the circumferential direction to increase or decrease the exhaust area of ​​the air flow channel.

Images