Sealing device for an aeroengine hydrodynamic dynamometer insulated cabin

Abstract

The present application relates to the technical field of aero-engine whole machine test, and discloses a sealing device for a heat insulation cabin of a water power dynamometer of an aero-engine, comprising: a sealing connection assembly, comprising an outer annular structure and an inner annular structure, the inner annular structure being located on the inner circumferential side of the outer annular structure, and the sealing connection assembly being adapted to be fixed on a flywheel of the dynamometer; a pressing plate assembly, fixedly connected with the end of the outer annular structure, and adapted to be sealingly connected with the heat insulation cabin; a labyrinth sealing ring, fixedly connected with the inner annular structure, and adapted to be fixed on the flywheel of the dynamometer, a dynamometer adapter being adapted to be arranged on the inner side of the labyrinth sealing ring and connected with a transmission shaft; and a breather pipe assembly, one end of which passes through the inner annular structure and is adapted to be in communication with a flywheel sealing cavity, and the other end of which passes through the outer annular structure and is in communication with the outside of an environmental cabin.

Description

Technical Field

[0001] This invention relates to the field of aero-engine whole-machine testing technology, and specifically to a sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer. Background Technology

[0002] A high-speed hydraulic dynamometer is a power measurement and absorption device used in high-speed rotating machinery, primarily in the research, development, production, and maintenance of aero-engines. Firstly, the hydraulic dynamometer requires water to generate friction between the stator and rotor to absorb the mechanical work output by the engine. Since water's freezing point is 0°C under standard atmospheric pressure, a heat-insulated chamber is necessary for low-temperature testing in environments below 0°C to prevent harmful effects from water's physical changes during operation. Secondly, the high-speed hydraulic dynamometer operates under normal temperature and pressure. In high-altitude negative pressure environments, the bearing lubricating oil may leak, preventing normal operation. The heat-insulated chamber effectively protects the high-speed hydraulic dynamometer from this negative pressure environment. When the engine undergoes high-altitude testing, the heat-insulated chamber and the high-speed hydraulic dynamometer are placed in an environmental chamber, which is a negative pressure, low-temperature environment; therefore, the sealing of the heat-insulated chamber is crucial.

[0003] A grate seal is a non-contact dynamic sealing device that does not completely block fluid leakage. Instead, it creates an extremely tortuous, high-resistance path that makes it very difficult for the fluid to pass through, thus greatly limiting the leakage rate. The sealing device is a stator, and the drive shaft assembly is a rotor.

[0004] In related technologies, the heat insulation chamber sealing device achieves a sealing effect through grates, and the sealing device is fixed to the dynamometer heat insulation chamber with bolts. The engine and dynamometer are connected via a drive shaft assembly, which consists of a connecting shaft and a dynamometer adapter section. The dynamometer adapter section mainly converts the dynamometer interface into a connecting shaft connection. Because the connecting shaft is long enough, the grate sealing position is at the connecting shaft between the dynamometer and the engine, and the corresponding sealing device is fixed to the heat insulation chamber with screws. Corresponding high-altitude tests have verified that this meets the relevant test requirements. However, with the continuous development of engine and high-altitude test platforms, to improve the dynamic characteristics of the shaft system, the length of the connecting shaft has been shortened to reduce weight, changing the relative position of the sealing device and the drive shaft assembly. The current sealing device can no longer meet the test requirements. Tests revealed that when the grate sealing position is changed (the sealing position becomes the dynamometer adapter section), the sealing effect is extremely poor, even failing to seal when the pressure difference inside and outside the heat insulation chamber is only 11 kPa, resulting in severe leakage of lubricating oil from the dynamometer and its associated flywheel. Summary of the Invention

[0005] In view of this, the present invention provides a sealing device for the heat insulation chamber of a hydraulic dynamometer for an aircraft engine, so as to solve the problem of poor sealing effect of sealing devices in related technologies.

[0006] This invention provides a sealing device for the heat insulation chamber of a hydraulic dynamometer in an aircraft engine, comprising:

[0007] A sealing connection assembly includes an outer annular structure and an inner annular structure, wherein the inner annular structure is located on the inner circumference of the outer annular structure, and the sealing connection assembly is adapted to be fixed on the flywheel of a dynamometer.

[0008] A pressure plate assembly is fixedly connected to the end of the outer annular structure, and the pressure plate assembly is adapted to be sealed to the heat insulation chamber.

[0009] A toothed sealing ring is fixedly connected to the inner annular structure. The toothed sealing ring is adapted to be fixed on the dynamometer flywheel. The dynamometer adapter section is adapted to be located on the inner side of the toothed sealing ring and connected to the drive shaft.

[0010] The venting tube assembly has one end passing through the inner annular structure and adapted to communicate with the flywheel sealing cavity, and the other end passing through the outer annular structure and communicating with the outside of the environmental chamber.

[0011] Beneficial Effects: The heat insulation chamber is located inside the environmental chamber, which maintains a normal temperature and pressure environment. The environmental chamber outside the heat insulation chamber operates at the required atmospheric pressure, while the environment outside the environmental chamber maintains a normal temperature and pressure environment. A pressure difference exists between the inside and outside of the heat insulation chamber. Specifically, during the test, the sealing connection assembly is fixed to the dynamometer flywheel. The pressure plate assembly is fixedly connected to the end of the outer annular structure and sealed to the heat insulation chamber. The toothed sealing ring is fixed to the dynamometer flywheel. The engine is connected to the dynamometer adapter section via a drive shaft. When the pressure difference is small, the sealing path created by the toothed sealing ring is sufficient. As the pressure difference increases, the sealing path created by the toothed sealing ring becomes insufficient. At this point, the vent pipe assembly begins to supply air to the flywheel sealing chamber to stabilize the pressure inside the flywheel sealing chamber and prevent pressure from being transmitted to the dynamometer lubrication bearing, thus ensuring no lubricating oil leakage. In addition, when the temperature and pressure conditions of the engine and the heat insulation compartment change significantly, the center height of the heat insulation compartment will change due to thermal expansion and contraction. Since the grate sealing ring is fixed on the dynamometer flywheel, it is not affected by the height change of the heat insulation compartment. The coaxiality of the grate sealing ring with the drive shaft and the dynamometer transition section is guaranteed, so that the gap between the grate sealing ring and the drive shaft or the dynamometer transition section is always consistent with the design value, thus maintaining a good sealing effect.

[0012] This sealing device allows for the replacement of only the connecting section between different drive shafts and dynamometer transition sections, without limiting the length of the drive shaft, and provides a consistent sealing effect. It can eliminate the influence of thermal expansion and contraction of the insulation chamber on the coaxiality of the sealing device, drive shaft, and dynamometer transition section when the test temperature changes significantly, ensuring the gap between the grate sealing ring and the drive shaft or dynamometer transition section, and improving the sealing effect of the sealing device.

[0013] In one optional embodiment, the venting assembly includes a lower venting section and an upper venting section. The lower venting section passes through the inner annular structure and is adapted to communicate with the flywheel sealing cavity. The upper venting section passes through the outer annular structure and communicates with the outside of the environmental chamber. The upper venting section is inserted into the lower venting section.

[0014] In one alternative implementation, the vent assembly is provided in two sets.

[0015] In one alternative embodiment, the outer annular structure includes a first annular sidewall and a first connecting portion located at one end of the first annular sidewall, the first connecting portion being adapted to be connected to the dynamometer flywheel via a first fastener, and the pressure plate assembly being fixedly connected to the other end of the first annular sidewall.

[0016] In one alternative embodiment, the inner annular structure includes a second annular sidewall and a second connecting portion located at one end of the first annular sidewall, the second connecting portion being adapted to be connected to the dynamometer flywheel via a second fastener.

[0017] In one optional embodiment, the first connecting portion is provided with a plurality of portions spaced apart circumferentially, the second connecting portion is provided with a plurality of portions spaced apart circumferentially, and the second connecting portion is disposed between two adjacent first connecting portions.

[0018] In one optional embodiment, the inner annular structure further includes a first annular connecting portion located at the other end of the second annular sidewall, the toothed sealing ring includes a sealing ring body and a second annular connecting portion located on the outer periphery of the sealing ring body, and a third fastener is adapted to pass through the second annular connecting portion and the first annular connecting portion and connect to the dynamometer flywheel.

[0019] In one alternative embodiment, the outer annular structure includes a third annular connecting portion located at the other end of the first annular sidewall, and the pressure plate assembly is fixedly connected to the third annular connecting portion.

[0020] In one alternative embodiment, the pressure plate assembly includes an outer pressure plate, an inner pressure plate, and a sealing gasket. The outer pressure plate surrounds the outer periphery of the inner pressure plate, the inner pressure plate is connected to the end of the outer annular structure, and the sealing gasket is located between the inner pressure plate and the insulation chamber, and between the outer pressure plate and the insulation chamber.

[0021] In one alternative embodiment, the outer annular structure is connected to an adapter. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a sealing device for a hydraulic dynamometer heat insulation chamber of an aero-engine, according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 The front view of the sealing device shown;

[0025] Figure 3 for Figure 2 AA section view in the middle;

[0026] Figure 4 for Figure 1 Side view of the sealing device shown;

[0027] Figure 5 This is a schematic diagram of the outer ring structure;

[0028] Figure 6 This is a schematic diagram of the inner ring structure;

[0029] Figure 7 A schematic diagram of the grate sealing ring;

[0030] Figure 8 This is a cross-sectional view after the sealing device is connected to the heat insulation chamber.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Insulated chamber; 2. Environmental chamber; 3. Outer annular structure; 301. First annular sidewall; 3011. First conical section; 3012. Second conical section; 302. First connecting part; 303. Third annular connecting part; 4. Inner annular structure; 401. Second annular sidewall; 402. Second connecting part; 403. First annular connecting part; 5. Grate sealing ring; 501. Sealing ring body; 502. Second annular connecting part; 6. Dynamometer adapter section; 7. Drive shaft; 8. Lower section of vent pipe; 9. Upper section of vent pipe; 10. Flywheel sealing cavity; 11. Outer pressure plate; 12. Inner pressure plate; 13. Sealing gasket; 14. First fastener; 15. Second fastener; 16. Third fastener; 17. Fourth fastener; 18. Fifth fastener; 19. Sixth fastener; 20. Adapter. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] In related technologies, the heat insulation chamber sealing device achieves a sealing effect through grates, and the sealing device is fixed to the dynamometer heat insulation chamber with bolts. The engine and dynamometer are connected via a drive shaft assembly, which consists of a connecting shaft and a dynamometer adapter section. The dynamometer adapter section mainly converts the dynamometer interface into a connecting shaft connection. Because the connecting shaft is long enough, the grate sealing position is at the connecting shaft between the dynamometer and the engine, and the corresponding sealing device is fixed to the heat insulation chamber with screws. Corresponding high-altitude tests have verified that this meets the relevant test requirements. However, with the continuous development of engine and high-altitude test platforms, to improve the dynamic characteristics of the shaft system, the length of the connecting shaft has been shortened to reduce weight, changing the relative position of the sealing device and the drive shaft assembly. The current sealing device can no longer meet the test requirements. Tests revealed that when the grate sealing position is changed (the sealing position becomes the dynamometer adapter section), the sealing effect is extremely poor, even failing to seal when the pressure difference inside and outside the heat insulation chamber is only 11 kPa, resulting in severe leakage of lubricating oil from the dynamometer and its associated flywheel.

[0038] In addition, when the external ambient temperature changes significantly, the center height of the heat insulation chamber will change due to thermal expansion and contraction. The coaxiality between the sealing device and the drive shaft will increase. During the test, the original design gap of the grate sealing ring will be expanded due to the high-speed rotation of the drive shaft assembly, resulting in a poorer sealing effect and the test cannot be carried out normally.

[0039] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a sealing device for a hydraulic dynamometer heat insulation chamber 1 of an aircraft engine is provided, comprising a sealing connection assembly, a pressure plate assembly, a toothed sealing ring 5, and a vent pipe assembly.

[0041] The sealing connection assembly includes an outer annular structure 3 and an inner annular structure 4. The inner annular structure 4 is located on the inner circumference of the outer annular structure 3. The sealing connection assembly is adapted to be fixed on the dynamometer flywheel. The pressure plate assembly is fixedly connected to the end of the outer annular structure 3. The pressure plate assembly is adapted to be sealed to the heat insulation chamber 1. The toothed sealing ring 5 is fixedly connected to the inner annular structure 4. The toothed sealing ring 5 is adapted to be fixed on the dynamometer flywheel. The dynamometer transition section 6 is adapted to be located inside the toothed sealing ring 5 and connected to the drive shaft 7. One end of the vent pipe assembly passes through the inner annular structure 4 and is adapted to communicate with the flywheel sealing cavity 10. The other end passes through the outer annular structure 3 and communicates with the outside of the environmental chamber 2.

[0042] In this embodiment, the heat insulation chamber 1 is located inside the environmental chamber 2. The heat insulation chamber 1 is a normal temperature and pressure environment, while the environmental chamber 2 outside the heat insulation chamber 1 is at the atmospheric pressure required for the test. The environment outside the environmental chamber 2 is a normal temperature and pressure environment. There is a pressure difference between the inside and outside of the heat insulation chamber 1. Specifically, during the test, the sealing connection assembly is fixed to the flywheel of the dynamometer, the pressure plate assembly is fixedly connected to the end of the outer annular structure 3 and sealed to the heat insulation chamber 1, the toothed sealing ring 5 is fixed to the flywheel of the dynamometer, and the engine is connected to the dynamometer transition section 6 through the drive shaft 7. When the pressure difference is small, the sealing path created by the toothed sealing ring 5 can meet the requirements. As the pressure difference continues to increase, the sealing path created by the toothed sealing ring 5 can no longer meet the requirements. At this time, the vent pipe assembly begins to replenish air to the flywheel sealing cavity 10 to stabilize the pressure inside the flywheel sealing cavity 10 and prevent the pressure from being transmitted to the lubricating bearing of the dynamometer, thereby ensuring that there is no leakage of lubricating oil. In addition, when the temperature and pressure conditions of the engine and the heat insulation compartment 1 change significantly, the center height of the heat insulation compartment 1 will change due to thermal expansion and contraction. Since the grate sealing ring 5 is fixed on the dynamometer flywheel, it is not affected by the height change of the heat insulation compartment 1. The coaxiality of the grate sealing ring 5 with the drive shaft 7 and the dynamometer transition section 6 is guaranteed, so that the gap between the grate sealing ring 5 and the drive shaft 7 or the dynamometer transition section 6 is always consistent with the design value, thus maintaining a good sealing effect.

[0043] This sealing device allows for the replacement of only the connecting section between different drive shafts 7 and dynamometer transition sections 6, without limiting the length of drive shaft 7, and provides a consistent sealing effect. It can eliminate the influence of thermal expansion and contraction of the insulation chamber 1 on the coaxiality of the sealing device, drive shaft 7, and dynamometer transition section 6 when the test temperature changes significantly, ensuring the gap between the toothed sealing ring 5 and the drive shaft 7 or dynamometer transition section 6, and improving the sealing effect of the sealing device.

[0044] In one specific embodiment, the center of the dynamometer adapter section 6 is connected to the flywheel via a sixth fastener 19. The sixth fastener 19 may specifically be a bolt.

[0045] In one embodiment, the venting assembly includes a lower venting section 8 and an upper venting section 9. The lower venting section 8 passes through the inner annular structure 4 and is adapted to communicate with the flywheel sealing cavity 10. The upper venting section 9 passes through the outer annular structure 3 and communicates with the outside of the environmental chamber 2. The upper venting section 9 is inserted into the lower venting section 8.

[0046] In this embodiment, the vent pipe assembly includes a lower vent pipe section 8 and an upper vent pipe section 9. The lower vent pipe section 8 passes through the inner annular structure 4 and is adapted to communicate with the flywheel sealing cavity 10. The upper vent pipe section 9 passes through the outer annular structure 3 and communicates with the outside of the environmental chamber 2. The upper vent pipe section 9 is inserted into the lower vent pipe section 8. During processing, the lower vent pipe section 8 and the upper vent pipe section 9 are processed separately. During assembly, the lower vent pipe section 8 is first made to pass through the inner annular structure 4 and be adapted to communicate with the flywheel sealing cavity 10. Then, the upper vent pipe section 9 is made to pass through the outer annular structure 3 and communicate with the outside of the environmental chamber 2. The upper vent pipe section 9 is then inserted into the lower vent pipe section 8 for easy assembly.

[0047] In one specific embodiment, the upper section 9 of the vent pipe includes a corrugated section.

[0048] In one embodiment, the vent assembly has two sets.

[0049] In this embodiment, the vent pipe assembly is provided in two sets, which can quickly replenish air to the flywheel sealing chamber 10, stabilize the pressure inside the flywheel sealing chamber 10, prevent the pressure from being transmitted to the dynamometer lubrication bearing, and thus ensure that there is no leakage of lubricating oil.

[0050] In one embodiment, the outer annular structure 3 includes a first annular sidewall 301 and a first connecting portion 302 located at one end of the first annular sidewall 301. The first connecting portion 302 is adapted to be connected to the dynamometer flywheel via a first fastener 14, and the pressure plate assembly is fixedly connected to the other end of the first annular sidewall 301.

[0051] In this embodiment, the outer annular structure 3 includes a first annular sidewall 301 and a first connecting portion 302 located at one end of the first annular sidewall 301. The first connecting portion 302 is provided to facilitate a fixed connection with the flywheel of the dynamometer.

[0052] In one specific embodiment, the first fastener 14 is a bolt.

[0053] In one specific embodiment, the first annular sidewall 301 includes a first conical segment 3011 and a second conical segment 3012. Along the direction close to the dynamometer, both the first conical segment 3011 and the second conical segment 3012 extend toward the axis close to the outer annular structure 3.

[0054] In one embodiment, the inner annular structure 4 includes a second annular sidewall 401 and a second connecting portion 402 located at one end of the first annular sidewall 301. The second connecting portion 402 is adapted to be connected to the dynamometer flywheel via a second fastener 15.

[0055] In this embodiment, the inner annular structure 4 includes a second annular sidewall 401 and a second connecting portion 402 located at one end of the first annular sidewall 301. The second connecting portion 402 is provided to facilitate a fixed connection with the dynamometer flywheel.

[0056] In one specific embodiment, the second fastener 15 is a bolt.

[0057] In addition, by making the sealing connection assembly include an outer annular structure 3 and an inner annular structure 4, the outer annular structure 3 and the inner annular structure 4 are machined separately during processing, which facilitates processing and assembly. Furthermore, the size of the inner annular structure 4 can be adjusted according to the size of the toothed sealing ring 5, making it suitable for different sizes of toothed sealing rings 5, thus broadening its applicability.

[0058] In one embodiment, a plurality of first connecting portions 302 are spaced apart circumferentially, and a plurality of second connecting portions 402 are spaced apart circumferentially, with the second connecting portions 402 disposed between two adjacent first connecting portions 302.

[0059] In this embodiment, multiple first connecting portions 302 are spaced apart circumferentially, and multiple second connecting portions 402 are spaced apart circumferentially. The second connecting portions 402 are located between two adjacent first connecting portions 302, which can ensure the fixed stability of the entire sealing device.

[0060] In one embodiment, the inner annular structure 4 further includes a first annular connecting portion 403 located at the other end of the second annular sidewall 401, the toothed sealing ring 5 includes a sealing ring body 501 and a second annular connecting portion 502 located on the outer periphery of the sealing ring body 501, and the third fastener 16 is adapted to pass through the second annular connecting portion 502 and the first annular connecting portion 403 and connect to the dynamometer flywheel.

[0061] In this embodiment, the inner annular structure 4 also includes a first annular connecting portion 403 located at the other end of the second annular sidewall 401. The toothed sealing ring 5 includes a sealing ring body 501 and a second annular connecting portion 502 located on the outer periphery of the sealing ring body 501. The third fastener 16 is adapted to pass through the second annular connecting portion 502 and the first annular connecting portion 403 and connect to the dynamometer flywheel. Therefore, the third fastener 16 can connect the inner annular structure 4, the toothed sealing ring 5 and the flywheel as a whole, thereby ensuring the coaxiality of the toothed sealing ring 5 with the drive shaft 7 and the dynamometer adapter section 6.

[0062] In one specific embodiment, the third fastener 16 is a bolt.

[0063] In one embodiment, the outer annular structure 3 includes a third annular connecting portion 303 located at the other end of the first annular sidewall 301, and the pressure plate assembly is fixedly connected to the third annular connecting portion 303.

[0064] In one embodiment, the outer annular structure 3 includes a third annular connecting portion 303 located at the other end of the first annular sidewall 301, the third annular connecting portion 303 being provided to facilitate a fixed connection with the pressure plate assembly.

[0065] In one embodiment, the pressure plate assembly includes an outer pressure plate 11, an inner pressure plate 12, and a sealing gasket 13. The outer pressure plate 11 surrounds the outer periphery of the inner pressure plate 12, the inner pressure plate 12 is connected to the end of the outer annular structure 3, and the sealing gasket 13 is located between the inner pressure plate 12 and the heat insulation chamber 1, and between the outer pressure plate 11 and the heat insulation chamber 1.

[0066] In this embodiment, the sealing gasket 13 is located between the inner pressure plate 12 and the heat insulation chamber 1, and between the outer pressure plate 11 and the heat insulation chamber 1. The outer pressure plate 11 and the inner pressure plate 12 can press the sealing gasket 13 tightly. The sealing gasket 13 is flexible and can effectively compensate for the axial error between the outer annular structure 3 and the heat insulation chamber 1.

[0067] In one specific embodiment, the sealing gasket 13 is a silicone rubber gasket.

[0068] In one specific embodiment, the inner pressure plate 12 is fixedly connected to the third annular connecting part 303 of the outer annular structure 3 by the fourth fastener 17, and the outer pressure plate 11 is fixedly connected to the heat insulation chamber 1 by the fifth fastener 18.

[0069] Specifically, both the fourth fastener 17 and the fifth fastener 18 are bolts.

[0070] In one embodiment, the outer annular structure 3 is connected to an adapter 20.

[0071] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A sealing device for the heat insulation chamber of a hydraulic dynamometer in an aircraft engine, characterized in that, include: The sealing connection assembly includes an outer annular structure (3) and an inner annular structure (4), wherein the inner annular structure (4) is located on the inner circumference of the outer annular structure (3), and the sealing connection assembly is adapted to be fixed on the flywheel of the dynamometer. The pressure plate assembly is fixedly connected to the end of the outer annular structure (3), and the pressure plate assembly is adapted to be sealed to the heat insulation chamber (1); The toothed sealing ring (5) is fixedly connected to the inner annular structure (4). The toothed sealing ring (5) is suitable for being fixed on the dynamometer flywheel. The dynamometer transition section (6) is suitable for being set inside the toothed sealing ring (5) and connected to the drive shaft (7). The ventilation tube assembly has one end passing through the inner annular structure (4) and adapted to communicate with the flywheel sealing cavity (10), and the other end passing through the outer annular structure (3) and communicating with the outside of the environmental chamber (2).

2. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 1, characterized in that, The venting pipe assembly includes a lower venting pipe section (8) and an upper venting pipe section (9). The lower venting pipe section (8) passes through the inner annular structure (4) and is adapted to communicate with the flywheel sealing cavity (10). The upper venting pipe section (9) passes through the outer annular structure (3) and communicates with the outside of the environmental chamber (2). The upper venting pipe section (9) is inserted into the lower venting pipe section (8).

3. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 1 or 2, characterized in that, The ventilation tube assembly has two sets.

4. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 1 or 2, characterized in that, The outer annular structure (3) includes a first annular sidewall (301) and a first connecting part (302) located at one end of the first annular sidewall (301). The first connecting part (302) is adapted to be connected to the flywheel of the dynamometer via a first fastener (14). The pressure plate assembly is fixedly connected to the other end of the first annular sidewall (301).

5. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 4, characterized in that, The inner annular structure (4) includes a second annular sidewall (401) and a second connecting part (402) located at one end of the first annular sidewall (301). The second connecting part (402) is adapted to be connected to the dynamometer flywheel via a second fastener (15).

6. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 5, characterized in that, The first connecting part (302) is provided with multiple portions spaced apart along the circumference, and the second connecting part (402) is provided with multiple portions spaced apart along the circumference, and the second connecting part (402) is provided between two adjacent first connecting parts (302).

7. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 5, characterized in that, The inner annular structure (4) further includes a first annular connecting part (403) located at the other end of the second annular sidewall (401). The toothed sealing ring (5) includes a sealing ring body (501) and a second annular connecting part (502) located on the outer periphery of the sealing ring body (501). The third fastener (16) is adapted to pass through the second annular connecting part (502) and the first annular connecting part (403) and connect to the dynamometer flywheel.

8. The sealing device for the heat insulation chamber of an aero-engine hydraulic dynamometer according to claim 4, characterized in that, The outer annular structure (3) includes a third annular connecting part (303) located at the other end of the first annular sidewall (301), and the pressure plate assembly is fixedly connected to the third annular connecting part (303).

9. The sealing device for the heat insulation chamber of a hydraulic dynamometer for an aircraft engine according to any one of claims 1, 2, 5 to 8, characterized in that, The pressure plate assembly includes an outer pressure plate (11), an inner pressure plate (12), and a sealing gasket (13). The outer pressure plate (11) surrounds the outer periphery of the inner pressure plate (12). The inner pressure plate (12) is connected to the end of the outer annular structure (3). The sealing gasket (13) is located between the inner pressure plate (12) and the heat insulation chamber (1), and between the outer pressure plate (11) and the heat insulation chamber (1).

10. The sealing device for the heat insulation chamber of a hydraulic dynamometer for an aircraft engine according to any one of claims 1, 2, 5 to 8, characterized in that, The outer annular structure (3) is connected to an adapter (20).

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