Performance testing method and system for diameter-variable rotary sealing element

Abstract

The invention relates to the technical field of structural component testing, in particular to a diameter-variable rotary sealing element performance testing method and system, and the method comprises the following steps: fixing an inner ring of a rotary sealing element to be tested through a plurality of sliding blocks, adjusting a plurality of axial telescopic connecting rods and a plurality of radial telescopic connecting rods, and testing the inner ring of the rotary sealing element to be tested; an outer ring lifting lug on the outer ring of the rotary sealing piece is in butt joint with the radial telescopic connecting rod; pressure is applied, and oil passes through an axis stand column oil conveying opening, an inner ring oil inlet, an outer ring oil outlet, an axial telescopic connecting rod and a liquid sliding ring and then passes through an axis stand column oil return opening to enter a recycling box; the rotary disc rotates to drive the rotary sealing piece outer ring to rotate; the data acquisition unit monitors corresponding information in real time and transmits the information to the data processing and analyzing unit, and the data processing and analyzing unit analyzes and processes the information to complete multi-performance testing of the rotary sealing element. The method and the system provided by the invention can be suitable for multi-performance testing of rotary sealing elements with different diameters.

Description

Technical Field

[0001] The invention relates to the technical field of structural component testing, and in particular to a method and system for testing the performance of a variable-diameter rotary seal. Background Art

[0002] In modern industrial applications, rotary sealing technology is widely used in rotating parts that need to maintain sealing of liquids, gases or other media, especially in the fields of petrochemicals, machinery manufacturing, energy equipment and aerospace. The core technology of rotary seals lies in the selection of their sealing structure and materials to ensure reliable sealing performance under complex working conditions such as high speed and pressure changes. However, with the changes in working conditions, such as increase or decrease in speed, pressure fluctuations and changes in ambient temperature, higher requirements are placed on rotary seal test devices. In particular, when the sealing test device needs to adapt to the different shaft diameter changes of the product, the traditional rotary seal test device is difficult to meet the requirements of variable diameter, let alone the requirements of multi-performance testing. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for testing the performance of a variable diameter rotary seal, which can meet the requirements of variable diameter and multi-performance testing.

[0004] The present invention is achieved through the following technical solutions: A method for testing the performance of a variable diameter rotary seal comprises the following steps: S1: The inner ring of the rotary seal to be tested is placed on a fixed chassis and fixed by a plurality of radially adjustable sliders, and a plurality of axial telescopic connecting rods and a plurality of radial telescopic connecting rods of the rotary unit are adjusted so that the outer ring lifting ears on the outer ring of the rotary seal are docked with and fixed to the corresponding radial telescopic connecting rods; S2: Apply pressure through the loading unit, and the oil flows through the oil delivery port of the axis column, the oil inlet of the inner ring, the oil outlet of the outer ring, the axial telescopic connecting rod, the liquid sliding ring, and then through the oil return port of the axis column into the recovery tank; S3: starting the driving motor to drive the rotating disk of the rotating unit to rotate, thereby driving the outer ring of the rotating seal to rotate through the axial telescopic connecting rod and the radial telescopic connecting rod; S4: The data acquisition unit monitors the required information in real time and transmits the corresponding information to the data processing and analysis unit. The data processing and analysis unit analyzes and processes the information to complete the multi-performance test of the rotating seal.

[0005] Optimally, the rotating seal to be tested in step S1 is a test model made according to similarity theory.

[0006] Further, the pressure applied in step S2 is gradually increased until the seal of the rotating seal fails. The data acquisition unit includes a pressure sensor installed in the sealing cavity of the rotating seal. The pressure sensor monitors the pressure information in the sealing cavity of the rotating seal in real time and transmits the pressure information to the data processing and analysis unit. The data processing and analysis unit records the pressure value when the rotating seal fails to test the maximum pressure bearing capacity of the rotating seal.

[0007] Furthermore, a pressure sensing paper is installed in the sealing groove of the rotating seal, and a sealing ring is installed on the pressure sensing paper to achieve sealing between the inner ring and the outer ring of the rotating seal. The data processing and analysis unit scans the pressure surface of the pressure sensing paper, and generates a pressure map and statistical data after inputting variables.

[0008] Furthermore, the temperature information in the sealing cavity of the rotating seal is monitored in real time by the temperature sensor of the data acquisition unit, and the temperature information is transmitted to the data processing and analysis unit. The data processing and analysis unit simultaneously records the pressure information in the sealing cavity of the rotating seal to explore the influence of temperature on the sealing performance of the rotating seal.

[0009] Furthermore, the torque information of the rotating shaft is monitored in real time by the torque sensor of the data acquisition unit, and the torque information of the rotating shaft is transmitted to the data processing and analysis unit. The speed information of the rotating shaft is monitored in real time by the speed sensor, and the speed information is transmitted to the data processing and analysis unit. The data processing and analysis unit calculates the theoretical torque of the drive motor according to the speed information, and calculates the friction torque of the rotating seal according to the theoretical torque and the torque of the rotating shaft monitored in real time. A temperature sensor is installed in the sealing cavity of the rotating seal to monitor the temperature information in the sealing cavity of the rotating seal in real time, and transmit the temperature information to the data processing and analysis unit to analyze the law of change of the friction torque with the speed and temperature.

[0010] A variable diameter rotary seal performance test system, used to perform a variable diameter rotary seal performance test method as described in any one of the above, comprising a test device, a loading unit, a data acquisition unit and a data processing and analysis unit, the test device comprising a support platform, a rotating unit and a fixed unit, the fixed unit comprising a fixed chassis and a plurality of sliders, the fixed chassis is fixedly mounted on the support platform and is provided with a plurality of slide grooves along the radial direction, the plurality of sliders are slidably mounted in the corresponding slide grooves, the rotating unit comprises a rotating disk, a plurality of axial telescopic connecting rods and a plurality of radial telescopic connecting rods, the rotating disk is connected to the rotating shaft of the driving motor, the bottoms of the plurality of radial telescopic connecting rods are respectively fixedly mounted on the rotating disk and distributed on the periphery of the fixed chassis, the plurality of axial telescopic connecting rods are respectively fixedly mounted on the rotating disk and distributed on the periphery of the fixed chassis, The axial column is fixedly installed on the free end of the corresponding radial telescopic connecting rod. The loading unit is provided with an axial column and a loader. The axial column is fixedly installed on the supporting platform. The loader is connected with the axial column through a pipeline. The oil delivery port of the axial column is connected with the oil delivery port of the inner ring of the rotating seal to be tested. The oil outlet of the outer ring of the rotating seal is connected with the axial telescopic connecting rod through a pipeline. The axial telescopic connecting rod is connected with the outer ring of the liquid sliding ring installed in the middle of the rotating disk through a pipeline. The inner ring of the liquid sliding ring is connected with the oil return port of the axial column. The oil return port of the axial column is connected with the recovery box. The data acquisition unit includes a variety of sensors for collecting required data information and transmitting the collected data information to the data processing and analysis unit. The data processing and analysis unit analyzes and processes the data information to complete multiple performance tests on the rotating seal.

[0011] Furthermore, the data acquisition unit includes a pressure sensor, which is installed in the sealing cavity of the rotating seal and is used to monitor the pressure information in the sealing cavity in real time and transmit the pressure information to the data processing and analysis unit, thereby performing sealing pressure resistance detection on the rotating seal.

[0012] Furthermore, the data acquisition unit also includes a temperature sensor, which is installed in the sealing cavity of the rotating seal, for real-time monitoring of the temperature information in the sealing cavity, and transmitting the temperature information to the data processing and analysis unit. The data processing and analysis unit simultaneously records the pressure information in the sealing cavity of the rotating seal to explore the influence of temperature on the sealing performance of the rotating seal.

[0013] Furthermore, the data acquisition unit also includes a torque sensor and a speed sensor. The torque sensor is installed between the drive motor and the rotating shaft to monitor the torque information of the rotating shaft in real time, and transmit the torque information of the rotating shaft to the data processing and analysis unit. The speed sensor is installed on the rotating shaft of the drive motor to monitor the speed information of the rotating shaft in real time, and transmit the speed information to the data processing and analysis unit. The data processing and analysis unit calculates the theoretical torque of the drive motor according to the speed information, and calculates the friction torque of the rotating seal according to the theoretical torque and the torque of the rotating shaft monitored in real time. The temperature information in the sealing cavity of the rotating seal is monitored in real time through the temperature sensor, and the temperature information is transmitted to the data processing and analysis unit to analyze the law of change of the friction torque with speed and temperature.

[0014] Beneficial effects of the invention: The present invention provides a variable diameter rotary seal performance testing method and system, which has the following advantages: 1. It can be used for performance testing of rotating seals with different diameters. It is easy to operate, install and debug, and is suitable for laboratory and industrial applications.

[0015] 2. Through the arrangement of multiple sensors, all-round monitoring of rotating seals can be achieved, including friction performance, pressure response and temperature changes, etc., which can provide accurate and reliable data support for the performance test of rotating seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process of the present invention.

[0017] Figure 2 It is a schematic diagram of the main structure of the testing device of the present invention.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the testing device of the present invention.

[0019] Figure 4 It is a schematic diagram of a data acquisition unit of the present invention.

[0020] In the figure: 1. test device; 101. support chassis; 102. platform legs; 103. fixed chassis; 104. slider; 105. rotating disk; 106. axial telescopic link; 107. radial telescopic link; 108. hydraulic slip ring; 109. driving motor; 2. loading unit; 201. axis column; 202. axis column oil delivery port; 3. data acquisition unit; 301. pressure sensor; 302. temperature sensor; 303. torque sensor; 304. speed sensor; 305. pressure sensing paper; 4. data processing and analysis unit; 5. rotating seal; 501. inner ring; 502. outer ring; 503. outer ring lifting ear; 504. sealing ring; 505. outer ring oil outlet; 506. inner ring oil inlet. DETAILED DESCRIPTION

[0021] A method for testing the performance of a variable diameter rotary seal comprises the following steps, and its flow chart is as follows: Figure 1 As shown: S1: placing the inner ring of the rotary seal to be tested on a fixed chassis and fixing it with a plurality of radially adjustable sliders, adjusting a plurality of axial telescopic links and a plurality of radial telescopic links of the rotary unit, so that the outer ring lifting ears 503 on the outer ring of the rotary seal are docked with and fixed to the corresponding radial telescopic links; The rotating seal 5 to be tested generally comprises a fixed inner ring 501 and a rotating outer ring 502 , with a sealing ring 504 provided between the inner ring and the outer ring, so that a sealed cavity with a certain space is formed between the inner ring and the outer ring.

[0022] By radially moving the slider, the inner ring of the rotary seal with different diameters can be fixed, and by adjusting the multiple axial telescopic connecting rods and the multiple radial telescopic connecting rods of the rotary unit, the outer ring of the rotary seal and the rotary unit can be connected.

[0023] S2: Apply pressure through the loading unit, and the oil flows through the oil delivery port of the axis column, the oil inlet of the inner ring, the oil outlet of the outer ring, the axial telescopic connecting rod, the liquid sliding ring, and then through the oil return port of the axis column into the recovery tank; By setting up the pressurization system, the pressure effect of the actual working condition of the rotary seal can be simulated. And by comparing the return oil volume of the recovery tank with the oil supply volume of the oil tank, it is possible to test whether the rotary seal is leaking.

[0024] S3: Start the drive motor to drive the rotating disk of the rotating unit to rotate, thereby driving the outer ring of the rotating seal to rotate through the axial telescopic connecting rod and the radial telescopic connecting rod; when the rotating unit rotates, the outer ring of the rotating seal can be driven to rotate together, thereby simulating the application scenarios of the rotating seal and facilitating multi-performance tests of rotating seals with different diameters.

[0025] S4: The data acquisition unit monitors the required information in real time and transmits the corresponding information to the data processing and analysis unit. The data processing and analysis unit analyzes and processes the information to complete the multi-performance test of the rotating seal.

[0026] Optimally, the rotary seal to be tested in step S1 is a test model made according to similarity theory, which is convenient for testing the performance of rotary seals with similar structures and corresponding application scenarios.

[0027] Further, the pressure applied in step S2 is gradually increased until the seal of the rotating seal fails. The data acquisition unit includes a pressure sensor installed in the sealing cavity of the rotating seal. The pressure sensor monitors the pressure information in the sealing cavity of the rotating seal in real time and transmits the pressure information to the data processing and analysis unit. The data processing and analysis unit records the pressure value when the rotating seal fails to test the maximum pressure bearing capacity of the rotating seal.

[0028] By comparing the oil return volume from the recovery tank with the oil supply volume from the oil tank, the leak of the rotary seal can be tested. When the leak exceeds the set value, the seal ring of the rotary seal can be judged to be failed. The pressure value at this time is recorded as the maximum pressure bearing capacity of the seal ring of the rotary seal, which can be used for the design optimization of the seal ring of the rotary seal with different working pressure levels.

[0029] Furthermore, a pressure sensing paper is installed in the sealing groove of the rotating seal, and a sealing ring is installed on the pressure sensing paper to achieve the sealing of the inner ring and the outer ring of the rotating seal. The data processing and analysis unit scans the pressure surface of the pressure sensing paper, and generates a pressure map and statistical data after inputting variables. When a sudden pressure change occurs, the specific location and value of the sudden pressure change can be confirmed through the pressure map and statistical data.

[0030] Furthermore, the temperature information in the sealing cavity of the rotating seal is monitored in real time by the temperature sensor of the data acquisition unit, and the temperature information is transmitted to the data processing and analysis unit. The data processing and analysis unit simultaneously records the pressure information in the sealing cavity of the rotating seal to explore the influence of temperature on the sealing performance of the rotating seal.

[0031] Furthermore, the torque information of the rotating shaft is monitored in real time by the torque sensor of the data acquisition unit, and the torque information of the rotating shaft is transmitted to the data processing and analysis unit. A speed sensor is installed on the rotating shaft of the driving motor to monitor the rotational speed information of the rotating shaft in real time, and the rotational speed information is transmitted to the data processing and analysis unit. The data processing and analysis unit calculates the theoretical torque of the driving motor according to the rotational speed information, and calculates the friction torque of the rotating seal according to the theoretical torque and the torque of the rotating shaft monitored in real time. The temperature information in the sealing cavity of the rotating seal is monitored in real time by the temperature sensor, and the temperature information is transmitted to the data processing and analysis unit to analyze the law of change of the friction torque with rotational speed and temperature.

[0032] Specifically, the data processing and analysis unit calculates the theoretical torque of the drive motor according to the speed information using the following method: First, the output force of the shaft is calculated using the following formula based on the speed information and the power of the drive motor: ; in: Represents the output force of the shaft, Indicates the power of the driving motor, Indicates the rotation speed of the shaft. Indicates the radius from the shaft of the drive motor to the point of force application; Then calculate the theoretical torque of the drive motor according to the following formula: ; in: Represents the theoretical torque of the drive motor, Represents the angle between the direction of the force and the lever arm.

[0033] The friction torque of the rotating seal is equal to the difference between the theoretical torque of the drive motor and the torque of the rotating shaft monitored in real time.

[0034] A variable diameter rotary seal performance testing system is used to execute a variable diameter rotary seal performance testing method as described in any one of the above, which comprises a testing device 1, a loading unit 2, a data acquisition unit 3 and a data processing and analysis unit 4.

[0035] The schematic diagram of the test device is as follows: Figure 2 , Figure 3 As shown, the testing device includes a supporting platform, a rotating unit and a fixing unit. The supporting platform may be provided with a supporting chassis 101 and platform legs 102 .

[0036] The fixed unit includes a fixed chassis 103 and a plurality of sliders 104. The fixed chassis is fixedly mounted on the supporting chassis of the supporting platform and is provided with a plurality of slide grooves in the radial direction. The plurality of sliders are slidably mounted in the corresponding slide grooves, so that the sliders can slide along the slide grooves on the fixed chassis, thereby meeting the performance test requirements of rotating seals of different diameters. Specifically, a screw rod can be fixedly mounted in the slide groove, and the slider is sleeved on the screw rod with clearance fit. The screw rod is sleeved with a locking nut at the outer end of the slider. When the slider moves into position, one end of the slider presses against the outer wall of the inner ring of the rotating seal, and the other end is locked by the locking nut.

[0037] The rotating unit includes a rotating disk 105, a plurality of axial telescopic connecting rods 106 and a plurality of radial telescopic connecting rods 107. The rotating disk is connected to the rotating shaft of a driving motor 109. The driving motor can be fixedly mounted on a supporting chassis of the supporting platform.

[0038] The bottoms of a plurality of radial telescopic connecting rods are respectively fixedly mounted on the rotating disk and distributed on the periphery of the fixed chassis, and a plurality of axial telescopic connecting rods are respectively fixedly mounted on the free ends of the corresponding radial telescopic connecting rods.

[0039] The loading unit is provided with an axial column 201 and a loader (not shown). The axial column is fixedly installed on the supporting platform. The loader is connected to the axial column through a pipeline. The oil delivery port 202 of the axial column is connected to the oil delivery port of the inner ring of the rotating seal to be tested. The oil outlet of the outer ring of the rotating seal is connected to the axial telescopic connecting rod through a pipeline. The axial telescopic connecting rod is connected to the outer ring of the liquid sliding ring 108 installed in the middle of the rotating disk through a pipeline. The inner ring of the liquid sliding ring is connected to the oil return port of the axial column, and the oil return port of the axial column is connected to the recovery box. Pressure is applied by the loader, and the oil passes through the axial column oil delivery port 202, the inner ring oil inlet 506, the outer ring oil outlet 505, the axial telescopic connecting rod, the liquid sliding ring, and then through the axial column oil return port (not shown) and then enters the recovery box (not shown).

[0040] The data acquisition unit includes a variety of sensors for collecting required data information and transmitting the collected data information to the data processing and analysis unit. The data processing and analysis unit analyzes and processes the data information to complete the multi-performance test of the rotating seal. The schematic diagram of the data acquisition unit is shown in Figure 4 shown.

[0041] Furthermore, the data acquisition unit includes a pressure sensor 301, which is installed in the sealing cavity of the rotating seal and is used to monitor the pressure information in the sealing cavity in real time and transmit the pressure information to the data processing and analysis unit, thereby performing sealing pressure resistance detection on the rotating seal.

[0042] Furthermore, the data acquisition unit also includes a temperature sensor 302, which is installed in the sealing cavity of the rotating seal and is used to monitor the temperature information in the sealing cavity in real time and transmit the temperature information to the data processing and analysis unit. The data processing and analysis unit also records the pressure information in the sealing cavity of the rotating seal to explore the influence of temperature on the sealing performance of the rotating seal.

[0043] Furthermore, the data acquisition unit also includes a torque sensor 303 and a speed sensor 304. The torque sensor is installed between the drive motor and the rotating shaft to monitor the torque information of the rotating shaft in real time, and transmit the torque information of the rotating shaft to the data processing and analysis unit. The speed sensor is installed on the rotating shaft of the drive motor to monitor the rotation speed information of the rotating shaft in real time, and transmit the rotation speed information to the data processing and analysis unit. The data processing and analysis unit calculates the friction torque of the rotating seal based on the calculated torque of the drive motor and the torque of the rotating shaft monitored in real time. A temperature sensor is installed in the sealing cavity of the rotating seal to monitor the temperature information in the sealing cavity of the rotating seal in real time, and transmit the temperature information to the data processing and analysis unit to analyze the law of changes in the friction torque with rotation speed and temperature.

[0044] A pressure sensing paper 305 can also be installed in the sealing groove of the rotating seal, and a sealing ring is installed on the pressure sensing paper to achieve the sealing of the inner ring and the outer ring of the rotating seal. The data processing and analysis unit scans the pressure surface of the pressure sensing paper, and generates a pressure map and statistical data after inputting variables. When a sudden pressure change occurs, the specific location and value of the sudden pressure change can be confirmed through the pressure map and statistical data.

[0045] In summary, the variable diameter rotary seal performance testing method and system provided by the present invention can be applicable to the performance testing of rotary seals of different diameters. It is easy to operate, convenient to install and debug, suitable for laboratory and industrial applications, and through the arrangement of multiple sensors, it can realize all-round monitoring of rotary seals, including friction performance, pressure response and temperature changes, etc., and can provide accurate and reliable data support for the performance testing of rotary seals.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the performance of a variable diameter rotary seal, characterized in that: The steps include: S1: The inner ring of the rotary seal to be tested is placed on a fixed chassis and fixed by a plurality of radially adjustable sliders, and a plurality of axial telescopic connecting rods and a plurality of radial telescopic connecting rods of the rotary unit are adjusted so that the outer ring lifting ears on the outer ring of the rotary seal are docked with and fixed to the corresponding radial telescopic connecting rods; S2: Apply pressure through the loading unit, and the oil flows through the oil delivery port of the axis column, the oil inlet of the inner ring, the oil outlet of the outer ring, the axial telescopic connecting rod, the liquid sliding ring, and then through the oil return port behind the axis column into the recovery tank; S3: starting the driving motor to drive the rotating disk of the rotating unit to rotate, thereby driving the outer ring of the rotating seal to rotate through the axial telescopic connecting rod and the radial telescopic connecting rod; S4: The data acquisition unit monitors the required information in real time and transmits the corresponding information to the data processing and analysis unit. The data processing and analysis unit analyzes and processes the information to complete the multi-performance test of the rotating seal.

2. A variable diameter rotary seal performance testing method according to claim 1, characterized in that: The rotating seal to be tested in step S1 is a test model made according to similarity theory.

3. The method for testing performance of a variable diameter rotary seal according to claim 1, characterized in that: The pressure applied in step S2 gradually increases until the seal of the rotating seal fails. The data acquisition unit includes a pressure sensor installed in the sealing cavity of the rotating seal. The pressure sensor monitors the pressure information in the sealing cavity of the rotating seal in real time and transmits the pressure information to the data processing and analysis unit. The data processing and analysis unit records the pressure value when the rotating seal fails to test the maximum pressure bearing capacity of the rotating seal.

4. The method for testing performance of a variable diameter rotary seal according to claim 1, characterized in that: A pressure sensing paper is installed in the sealing groove of the rotating seal, and a sealing ring is installed on the pressure sensing paper to achieve the sealing of the inner ring and the outer ring of the rotating seal. The data processing and analysis unit scans the pressure surface of the pressure sensing paper, and generates a pressure map and statistical data after inputting variables.

5. The method for testing performance of a variable diameter rotary seal according to claim 1, characterized in that: The temperature information in the sealing cavity of the rotating seal is monitored in real time by the temperature sensor of the data acquisition unit, and the temperature information is transmitted to the data processing and analysis unit. The data processing and analysis unit simultaneously records the pressure information in the sealing cavity of the rotating seal to explore the influence of temperature on the sealing performance of the rotating seal.

6. The method for testing performance of a variable diameter rotary seal according to claim 1, characterized in that: The torque information of the rotating shaft is monitored in real time by the torque sensor of the data acquisition unit, and the torque information of the rotating shaft is transmitted to the data processing and analysis unit. The speed information of the rotating shaft is monitored in real time by the speed sensor, and the speed information is transmitted to the data processing and analysis unit. The data processing and analysis unit calculates the theoretical torque of the drive motor according to the speed information, and calculates the friction torque of the rotating seal according to the theoretical torque and the torque of the rotating shaft monitored in real time. The temperature information in the sealing cavity of the rotating seal is monitored in real time by the temperature sensor, and the temperature information is transmitted to the data processing and analysis unit to analyze the law of change of the friction torque with the speed and temperature.

7. A variable diameter rotary seal performance testing system, used to perform a variable diameter rotary seal performance testing method as claimed in any one of claims 1 to 2, characterized in that: The invention comprises a testing device, a loading unit, a data acquisition unit and a data processing and analysis unit. The testing device comprises a supporting platform, a rotating unit and a fixing unit. The fixing unit comprises a fixed chassis and a plurality of slide blocks. The fixed chassis is fixedly mounted on the supporting platform and is provided with a plurality of slide grooves in the radial direction. The plurality of slide blocks are slidably mounted in the corresponding slide grooves. The rotating unit comprises a rotating disk, a plurality of axial telescopic connecting rods and a plurality of radial telescopic connecting rods. The rotating disk is connected to the rotating shaft of the driving motor. The bottoms of the plurality of radial telescopic connecting rods are fixedly mounted on the rotating disk and distributed on the periphery of the fixed chassis. The plurality of axial telescopic connecting rods are fixedly mounted on the free ends of the corresponding radial telescopic connecting rods. The loading unit is provided with An axial column and a loader, wherein the axial column is fixedly mounted on a supporting platform, the loader is connected to the axial column through a pipeline, the oil delivery port of the axial column is connected to the oil delivery port of the inner ring of the rotating seal to be tested, the oil outlet of the outer ring of the rotating seal is connected to the axial telescopic connecting rod through a pipeline, the axial telescopic connecting rod is connected to the outer ring of the liquid lubricating ring installed in the middle of the rotating disk through a pipeline, the inner ring of the liquid lubricating ring is connected to the oil return port of the axial column, and the oil return port of the axial column is connected to the recovery box, the data acquisition unit includes a variety of sensors for collecting required data information, and transmitting the collected data information to the data processing and analysis unit, the data processing and analysis unit analyzes and processes the data information to complete multiple performance tests on the rotating seal.

8. A variable diameter rotary seal performance testing system according to claim 7, characterized in that: The data acquisition unit includes a pressure sensor, which is installed in the sealing cavity of the rotating seal and is used to monitor the pressure information in the sealing cavity in real time and transmit the pressure information to the data processing and analysis unit, so as to perform sealing pressure resistance detection on the rotating seal.

9. A variable diameter rotary seal performance testing system according to claim 8, characterized in that: The data acquisition unit also includes a temperature sensor, which is installed in the sealing cavity of the rotating seal and is used to monitor the temperature information in the sealing cavity in real time and transmit the temperature information to the data processing and analysis unit. The data processing and analysis unit simultaneously records the pressure information in the sealing cavity of the rotating seal to explore the influence of temperature on the sealing performance of the rotating seal.

10. A variable diameter rotary seal performance testing system according to claim 9, characterized in that: The data acquisition unit also includes a torque sensor and a speed sensor. The torque sensor is installed between the drive motor and the rotating shaft to monitor the torque information of the rotating shaft in real time, and transmit the torque information of the rotating shaft to the data processing and analysis unit. The speed sensor is installed on the rotating shaft of the drive motor to monitor the rotational speed information of the rotating shaft in real time, and transmit the rotational speed information to the data processing and analysis unit. The data processing and analysis unit calculates the theoretical torque of the drive motor according to the rotational speed information, and calculates the friction torque of the rotating seal according to the theoretical torque and the torque of the rotating shaft monitored in real time. The temperature information in the sealing cavity of the rotating seal is monitored in real time through the temperature sensor, and the temperature information is transmitted to the data processing and analysis unit to analyze the law of changes in the friction torque with rotational speed and temperature.

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