An active cavity pressure regulating device for a biaxial compressor test piece

Abstract

The present application provides a device for actively regulating the cavity pressure of a compressor test piece, which belongs to the field of impeller test technology. The compressor test piece is provided with an unloading cavity, a bearing sealing cavity, a bearing front cavity, a bearing cavity and a bearing rear sealing cavity in sequence along the axial airflow direction, and each cavity is sealed by sealing grate teeth; the device comprises: an active regulating system for sealing air induction pressure, which is connected to the bearing front cavity and the bearing rear sealing cavity, and is used to introduce process gas into the cavity, so as to realize dynamic regulation of the sealing air supply pressure of the bearing front cavity and the bearing rear sealing cavity; a venting air collecting and emptying system, which is connected to the unloading cavity and the bearing sealing cavity, and the exhaust pressure of the unloading cavity and the bearing sealing cavity is dynamically regulated by the venting air collecting and emptying system, thereby ensuring the axial force while meeting the sealing pressure difference requirement; a bearing cavity active suction system, which is connected to the bearing cavity, and is used to realize active regulation of the bearing cavity suction pressure.

Description

Technical Field

[0001] The present application belongs to the technical field of impeller testing, and in particular relates to a cavity pressure active regulating device for a dual-axis compressor test piece. Background Art

[0002] A dual-shaft axial-flow compressor test piece typically includes a unloading chamber, a bearing seal chamber, a bearing front chamber, a bearing chamber, and a bearing rear seal chamber. For complete aircraft engine testing, the pressure within each compressor chamber can be self-balanced. However, for compressor component testing, self-balancing of the pressure within each chamber is not possible due to structural differences. The balance of pressure within each compressor chamber is crucial to the safe operation of the test piece. Mismatched pressures within each chamber can cause abnormal vibration of the test piece due to axial force imbalance, directly impacting test safety. Furthermore, this can lead to test piece problems such as high bearing temperature, blade coking, and oil and gas leakage. Therefore, an active chamber pressure regulator is crucial to ensuring the smooth conduct of compressor testing.

[0003] At present, for compressor component testing, the sealing air bleed pressure of each sealing cavity is generally set to a certain value, which only plays a sealing role. This method may cause the bearing sealing cavity pressure to be too high, and high-temperature sealing gas and lubricating oil enter the flow channel and adhere to the blade surface to form coke; the bearing cavity pressure generally adopts direct exhaust method, which is not applicable when the bearing cavity is at negative pressure. It will cause high sealing pressure and also affect the bearing lubricating oil injection, directly affecting the bearing cooling and lubrication; the unloading cavity generally uses a fixed number of pipes to discharge to the atmosphere. This method cannot achieve active adjustment of axial force. Summary of the Invention

[0004] The purpose of the present application is to provide a cavity pressure active regulation device for a biaxial compressor test piece to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: a biaxial compressor test piece cavity pressure active regulation device, wherein the compressor test piece is provided with an unloading cavity, a bearing sealing cavity, a bearing front cavity, a bearing cavity, and a bearing rear sealing cavity in the axial direction along the airflow direction, and the cavities are sealed by sealing grate teeth;

[0006] The cavity pressure active regulating device comprises:

[0007] An active seal air bleed pressure regulation system is connected to the bearing front cavity and the bearing rear seal cavity, and is used to introduce process gas into the cavity to achieve dynamic regulation of the seal air supply pressure of the bearing front cavity and the bearing rear seal cavity;

[0008] A vented air collection and emptying system, which is connected to the unloading chamber and the bearing sealing chamber. The vented air collection and emptying system is used to dynamically control the exhaust pressure of the unloading chamber and the bearing sealing chamber, thereby ensuring the axial force while meeting the sealing pressure difference requirement;

[0009] The bearing cavity active suction system is connected to the bearing cavity and is used to achieve active regulation of the bearing cavity suction pressure.

[0010] In some embodiments of the present application, the ventilation pore gas collection and exhaust system includes a first exhaust system and a second exhaust system consisting of one or more exhaust metal hoses and electric regulating valves, wherein:

[0011] One end of one or more exhaust metal hoses in the first exhaust system is connected to the unloading chamber, and the other end is connected to the electric regulating valve, and the other end of the electric regulating valve is connected to the atmospheric pipeline;

[0012] One end of one or more exhaust metal hoses in the second exhaust system is connected to the bearing sealing chamber, and the other end is connected to the electric regulating valve, and the other end of the electric regulating valve is connected to the atmosphere pipeline.

[0013] In some embodiments of the present application, the electric regulating valve in the first emptying system includes a main valve and an auxiliary valve arranged in parallel, and the main valve and the auxiliary valve respectively realize coarse adjustment and fine adjustment of the valve.

[0014] In some embodiments of the present application, the sealing air pressure active adjustment system includes a bearing front cavity adjustment system and a bearing rear sealing cavity adjustment system. The bearing front cavity adjustment system and the bearing rear sealing cavity adjustment system both include one or more sealing air supply pipelines. A single sealing air supply pipeline is composed of a manual regulating valve, a sealing electric regulating valve, a hose, and a pressure transmitter. One end of the sealing air supply pipelines in the bearing front cavity adjustment system and the bearing rear sealing cavity adjustment system are connected to the main air intake pipeline to form a common input end. The other end of the sealing air supply pipeline of the bearing front cavity adjustment system is connected to the bearing front cavity, and the other end of the sealing air supply pipeline of the bearing rear sealing cavity adjustment system is connected to the bearing rear sealing cavity.

[0015] In some embodiments of the present application, the pressure of the bearing front cavity adjusted by the bearing front cavity adjustment system is higher than the pressure of the bearing sealing cavity by (5-10) kPa;

[0016] The pressure of the bearing rear sealing cavity adjusted by the bearing rear sealing cavity adjustment system is higher than the pressure of the bearing cavity by (5-10) kPa.

[0017] In some embodiments of the present application, the bearing cavity active suction system includes a vortex blower, a temperature transmitter, a negative pressure transmitter, a buffer device, a suction electric regulating valve, an inlet filter device, and one or more suction metal hoses. One end of the one or more suction metal hoses is connected to the bearing cavity, and the other end is connected to the buffer device. A suction electric regulating valve is connected between the suction metal hose and the buffer device. The other end of the suction electric regulating valve is connected to the inlet filter device. The other end of the buffer device is connected to the vortex blower. A temperature transmitter and a negative pressure transmitter are arranged between the vortex blower and the buffer device, and the other end of the vortex blower is connected to the atmosphere pipeline.

[0018] In some embodiments of the present application, the vortex blower is a variable frequency blower or a fixed frequency blower with a valve.

[0019] The proposed compressor test specimen cavity pressure active regulation device utilizes multi-degree-of-freedom active control to meet axial force balance requirements. Matching the bearing seal cavity exhaust with the bearing front cavity pressure resolves the issue of test specimen blade coking. Dynamic adjustment of the seal bleed air pressure in response to the test specimen's state, combined with the bearing cavity suction system, addresses the issue of poor bearing cooling and lubrication caused by high seal and bearing cavity pressures, ensuring the integrity of the test specimen and the safe and smooth conduct of testing, thereby saving both testing time and resource costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0021] Figure 1 This is an overall schematic diagram of the active pressure regulating device for the compressor test piece of this application.

[0022] Figure 2 This is a schematic diagram of the vented air hole gas collection and exhaust system of this application.

[0023] Figure 3 This is a schematic diagram of the active air pressure regulation system for sealing in this application.

[0024] Figure 4 Schematic diagram of the bearing cavity active suction system of this application. DETAILED DESCRIPTION

[0025] 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.

[0026] In order to achieve dynamic adjustment of the pressure in each cavity of the compressor test piece, meet the axial force balance requirements, solve problems such as high bearing temperature of the test piece, ensure the safe and smooth progress of the test, and save test costs, this application proposes a dual-axis compressor test piece cavity pressure active control device and its control method.

[0027] like Figure 1 As shown, the compressor test piece cavity pressure active regulation device 100 provided in the present application includes a sealing bleed air pressure active regulation system 10, a vented air hole air collecting and emptying system 20 and a bearing cavity active suction system 30, wherein the vented air hole air collecting and emptying system 20 is connected to the unloading cavity 101 and the bearing sealing cavity 102, and the vented air hole air collecting and emptying system 20 is used to realize dynamic regulation of the exhaust pressure of the unloading cavity 101 and the bearing sealing cavity 102, thereby ensuring the axial force while meeting the sealing pressure difference requirement, the sealing bleed air pressure active regulation system 10 is connected to the bearing front cavity 103 and the bearing rear sealing cavity 105, and is used to introduce process gas into the cavity to realize dynamic regulation of the sealing gas supply pressure of the bearing front cavity 103 and the bearing rear sealing cavity 105, and the bearing cavity active suction system 30 is connected to the bearing cavity 104, and is used to realize active regulation of the suction pressure of the bearing cavity 104.

[0028] like Figure 2 As shown, the venting air collection and exhaust system 20 includes a first exhaust system 23 and a second exhaust system 24 composed of an exhaust metal hose 21 and an electric regulating valve 22.

[0029] The first exhaust system 23 includes one or more exhaust metal hoses 21 connected in parallel. One end of the exhaust metal hose 21 is connected to the unloading chamber 101, and the other end is connected to the electric control valve 22. The electric control valve 22 includes a main valve 221 and an auxiliary valve 222 arranged in parallel. The main valve 221 and the auxiliary valve 222 respectively realize the coarse adjustment and fine adjustment of the valve. The pressure of the unloading chamber 101 directly affects the axial force of the compressor test piece, and the gas temperature in the chamber is relatively high. During the test, a temperature and pressure measuring point 107 is set in the unloading chamber 101. By controlling the main valve 221 and the auxiliary valve 222, the unloading chamber 101 is connected to the atmospheric pipeline (discharged through the exhaust silencer tower) through the exhaust metal hose 21. The electric control valve 22 is adjusted in real time according to the test status and the magnitude of the axial force to ensure the balance of the axial force and prevent high-temperature gas from flowing into the bearing chamber 104.

[0030] The second exhaust system 24 also includes one or more exhaust metal hoses 21 connected in parallel. One end of the exhaust metal hose 21 is connected to the bearing sealing chamber 102, and the other end is connected to the electric control valve 22. Only one electric control valve 22 is required in the second exhaust system 24. The bearing sealing chamber 102 is used to discharge high-temperature gas and reduce the pressure of the chamber. On the one hand, it can prevent lubricating oil from entering the flow channel and adhering to the blade surface, causing it to coke and affect the performance of the compressor. On the other hand, it can reduce the sealing pressure of the bearing front chamber and save test costs. Generally, the pressure of the bearing sealing chamber 102 is lower than the static pressure of the flow channel at the compressor position connected to it. During the test, temperature and pressure measuring points 107 are set in the bearing sealing chamber 102. The hot gas in the bearing sealing chamber 102 is connected to the atmosphere through the exhaust metal hose 21 through the electric control valve 22 and discharged.

[0031] like Figure 3 As shown, the active air sealing pressure regulation system 10 includes a bearing front cavity regulation system 15 and a bearing rear sealing cavity regulation system 16. Each of the bearing front cavity regulation system 15 and the bearing rear sealing cavity regulation system 16 includes one or more sealing air supply lines. A single sealing air supply line is composed of a manual regulating valve 11, a sealing electric regulating valve 12, a hose 13, and a pressure transmitter 14. In the illustrated embodiment of this application, the bearing front cavity regulation system 15 includes three sealing air supply lines, and the bearing rear sealing cavity regulation system 16 includes two sealing air supply lines. One end of each of the bearing front cavity regulation system 15 and the bearing rear sealing cavity regulation system 16 is connected to the main air intake line 17 to form a common input end. The other end of the bearing front cavity regulation system 15 is connected to the bearing front cavity 103, and the other end of the bearing rear sealing cavity regulation system 16 is connected to the bearing rear sealing cavity 105.

[0032] The front bearing chamber 103 is located between the bearing sealing chamber 102 and the bearing chamber 104, connecting the two chambers. The gas temperature in the bearing sealing chamber 102 is higher, while the gas temperature in the bearing chamber 104 is lower. The front bearing chamber 103 prevents the high-temperature gas in the bearing sealing chamber 102 from entering the bearing chamber 104, thus preventing the bearing temperature from rising. It also seals the lubricating oil in the bearing chamber 104, preventing it from entering the high-temperature bearing sealing chamber 102 or even the unloading chamber 101, potentially causing combustion. The rear bearing sealing chamber 105 seals the lubricating oil in the bearing chamber 104, preventing oil leakage and bearing damage. Sealing grates 106 are used to seal the chambers.

[0033] During the test, the bearing front cavity adjustment system 15 and the bearing rear sealing cavity adjustment system 16 of the present application are connected to the bearing front cavity 103 and the bearing rear sealing cavity 105 via one or more sealing air supply lines. The sealing air entering the bearing front cavity 103 from the main air intake line 17 along the bearing front cavity adjustment system 15 is directed to the sealing grates 106 on both sides of the bearing front cavity 103. The sealing air entering the bearing rear sealing cavity 105 from the main air intake line 17 along the bearing rear sealing cavity adjustment system 16 is directed to the sealing grates 106 on both sides of the bearing rear sealing cavity 105, thereby achieving sealing of the bearing front cavity 103 and the bearing rear sealing cavity 105. The valve openings in the bearing front cavity adjustment system 15 and the bearing rear sealing cavity adjustment system 16 are actively controlled in real time based on the test status and the sealing pressure differential to ensure pressure balance between the cavities. Generally, the pressure of the bearing front cavity 103 is higher than the pressure of the bearing sealing cavity 102 by (5-10) kPa, and the pressure of the bearing rear sealing cavity 105 is higher than the pressure of the bearing cavity 104 by (5-10) kPa.

[0034] like Figure 4 As shown, the bearing cavity active suction system 30 includes a vortex fan 31, a temperature transmitter 32, a negative pressure transmitter 33, a buffer device 34, a suction electric regulating valve 35, an inlet filter device 36, and one or more suction metal hoses 37. One end of the one or more suction metal hoses 37 is connected to the bearing cavity 104, and the other end is connected to the buffer device 34. A suction electric regulating valve 35 is connected between the two. The other end of the suction electric regulating valve 35 is connected to the inlet filter device 36. The other end of the buffer device 34 is connected to the vortex fan 31. A temperature transmitter 32 and a negative pressure transmitter 33 are arranged between the two. The other end of the vortex fan 31 is connected to the atmosphere pipeline (discharged through the exhaust silencer tower). The pressure in the bearing cavity 104 directly affects the operation of the bearing. To prevent excessive bearing cavity pressure, which could lead to oil leakage or abnormal oil spraying from the oil nozzle, this application utilizes a vortex blower 31 to draw air from the bearing cavity 104, thereby reducing the pressure in the bearing cavity 104. A buffer device 34 is then used to collect the oil in the drawn air, thereby lowering test risks and reducing the sealing pressure requirements for the bearing front cavity 103 and the bearing rear sealing cavity 105, thus saving test costs. In this application, the vortex blower 31 can be a variable frequency blower or a fixed frequency blower with a valve.

[0035] The proposed compressor test specimen cavity pressure active regulation device utilizes multi-degree-of-freedom active control to meet axial force balance requirements. Matching the bearing seal cavity exhaust with the bearing front cavity pressure resolves the issue of test specimen blade coking. Dynamic adjustment of the seal bleed air pressure in response to the test specimen's state, combined with the bearing cavity suction system, addresses the issue of poor bearing cooling and lubrication caused by high seal and bearing cavity pressures, ensuring the integrity of the test specimen and the safe and smooth conduct of testing, thereby saving both testing time and resource costs.

[0036] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A biaxial compressor test piece cavity pressure active regulation device, characterized in that: The compressor pressure test piece is provided with an unloading cavity (101), a bearing sealing cavity (102), a bearing front cavity (103), a bearing cavity (104) and a bearing rear sealing cavity (105) in sequence along the axial direction of the airflow, and the cavities are sealed by sealing grate teeth (106); The cavity pressure active regulating device comprises: A sealing air bleed pressure active regulation system (10), the sealing air bleed pressure active regulation system (10) being connected to the bearing front cavity (103) and the bearing rear sealing cavity (105), and being used to introduce process gas into the cavity, thereby achieving dynamic regulation of the sealing air supply pressure of the bearing front cavity (103) and the bearing rear sealing cavity (105); A vented air collection and exhaust system (20), the vented air collection and exhaust system (20) being connected to the unloading chamber (101) and the bearing sealing chamber (102), and the vented air collection and exhaust system (20) being used to dynamically regulate the exhaust pressure of the unloading chamber (101) and the bearing sealing chamber (102), thereby ensuring the axial force while meeting the sealing pressure difference requirement; A bearing cavity active suction system (30) is provided, wherein the bearing cavity active suction system (30) is connected to the bearing cavity (104) and is used to actively regulate the suction pressure of the bearing cavity (104).

2. The active chamber pressure regulating device for a biaxial compressor test piece according to claim 1, characterized in that: The vented air hole gas collection and exhaust system (20) comprises a first exhaust system (23) and a second exhaust system (24) consisting of one or more exhaust metal hoses (21) and an electric regulating valve (22), wherein: One end of one or more exhaust metal hoses (21) in the first exhaust system (23) is connected to the unloading chamber (101), and the other end is connected to the electric regulating valve (22), and the other end of the electric regulating valve (22) is connected to the atmospheric pipeline; One end of one or more exhaust metal hoses (21) in the second exhaust system (24) is connected to the bearing sealing chamber (102), and the other end is connected to the electric regulating valve (22), and the other end of the electric regulating valve (22) is connected to the atmosphere pipeline.

3. The active chamber pressure regulating device for a biaxial compressor test piece according to claim 2, characterized in that: The electric regulating valve (22) in the first emptying system (23) comprises a main valve (221) and an auxiliary valve (222) arranged in parallel, wherein the main valve (221) and the auxiliary valve (222) respectively realize coarse adjustment and fine adjustment of the valve.

4. The active chamber pressure regulating device for a biaxial compressor test piece according to claim 1, characterized in that: The sealing air induction pressure active regulating system (10) includes a bearing front cavity regulating system (15) and a bearing rear sealing cavity regulating system (16). The bearing front cavity regulating system (15) and the bearing rear sealing cavity regulating system (16) both include one or more sealing air supply pipelines. The single-channel sealing air supply pipeline is composed of a manual regulating valve (11), a sealing electric regulating valve (12), a hose (13), and a pressure transmitter (14). One end of the sealing air supply pipeline in the bearing front cavity regulating system (15) and the bearing rear sealing cavity regulating system (16) is connected to the main air intake pipeline (17) to form a common input end. The other end of the sealing air supply pipeline of the bearing front cavity regulating system (15) is connected to the bearing front cavity (103), and the other end of the sealing air supply pipeline of the bearing rear sealing cavity regulating system (16) is connected to the bearing rear sealing cavity (105).

5. The active chamber pressure regulating device for a biaxial compressor test piece according to claim 4, characterized in that: The pressure of the bearing front cavity (103) adjusted by the bearing front cavity adjustment system (15) is 5 kPa to 10 kPa higher than the pressure of the bearing sealing cavity (102); The pressure of the bearing rear sealing cavity (105) adjusted by the bearing rear sealing cavity adjustment system (16) is 5 kPa to 10 kPa higher than the pressure of the bearing cavity (104).

6. The active chamber pressure regulating device for a biaxial compressor test piece according to claim 1, characterized in that: The bearing cavity active suction system (30) comprises a vortex blower (31), a temperature transmitter (32), a negative pressure transmitter (33), a buffer device (34), a suction electric regulating valve (35), an inlet filter device (36), and one or more suction metal hoses (37). One end of the one or more suction metal hoses (37) is connected to the bearing cavity (104), and the other end is connected to the buffer device (34). A suction electric regulating valve (35) is connected between the suction metal hose (37) and the buffer device (34). The other end of the suction electric regulating valve (35) is connected to the inlet filter device (36). The other end of the buffer device (34) is connected to the vortex blower (31). A temperature transmitter (32) and a negative pressure transmitter (33) are provided between the vortex blower (31) and the buffer device (34). The other end of the vortex blower (31) is connected to an atmospheric pipeline.

7. The active chamber pressure regulating device for a biaxial compressor test piece according to claim 6, characterized in that: The vortex fan (31) is a variable frequency fan or a fixed frequency fan with a valve.

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