CN113670602B - Rotary dynamic seal loss testing device and method - Google Patents
Rotary dynamic seal loss testing device and method Download PDFInfo
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- CN113670602B CN113670602B CN202110866956.XA CN202110866956A CN113670602B CN 113670602 B CN113670602 B CN 113670602B CN 202110866956 A CN202110866956 A CN 202110866956A CN 113670602 B CN113670602 B CN 113670602B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/005—Sealing rings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F19/00—Calibrated capacity measures for fluids or fluent solid material, e.g. measuring cups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
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Abstract
The invention discloses a rotary dynamic seal loss testing device and a method, wherein a testing shaft is arranged in a testing box body to form a testing structure of a rotating shaft sealing structure, two sealing rings to be tested are arranged between the testing shaft and the inner wall of the testing box body at intervals along the axial direction of the testing shaft, an oil groove is arranged between the two sealing rings to be tested on the inner wall of the testing box body, the sealing rings to be tested can reach the torque of the testing shaft under the sealing condition under the conditions of different temperatures and lubricating pressures by introducing constant-temperature and constant-pressure lubricating oil, and then the torque of the testing shaft without the sealing rings to be tested can be detected under the same working condition, so that the power loss of the rotary dynamic seal can be obtained. The invention can accurately obtain the power loss of the sealing ring and greatly improve the detection precision and the detection efficiency.
Description
Technical Field
The invention belongs to the technical field of mechanical design and experimental methods, particularly relates to a device and a method for testing power and leakage loss of a rotary dynamic seal, and particularly relates to a device and a method for testing loss of a rotary dynamic seal.
Background
The rotary sealing ring is an important element in the fields of automobile engineering and the like, and the performance of the sealing ring directly influences various performances of a transmission device. In the past, the sealing performance, failure mode and the like of the engineering technology are more concerned. However, with the increasing demands for smaller and lighter vehicles, the PV value in the transmission is gradually increased, and in such a case, the transmission efficiency is still maintained, and therefore, a higher demand is also placed on the power loss of the seal ring. At present, the power loss of the sealing ring is mainly summarized by depending on experience, effective data effects cannot be obtained, and effective supervision cannot be achieved on the power loss of the sealing rings in different batches, so that the power loss of the sealing ring needs to be effectively detected, and the detection precision and efficiency of the power loss of the sealing ring are improved.
Disclosure of Invention
The invention aims to provide a device and a method for testing loss of a rotary dynamic seal, which are used for overcoming the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rotary dynamic seal loss testing device comprises a testing box body and a testing shaft which is rotatably arranged in the testing box body, wherein two sealing rings to be tested are arranged between the testing shaft and the inner wall of the testing box body at intervals along the axial direction of the testing shaft; the leakage detection port in the intercommunication test box is seted up to test box lateral wall, reveals that the detection port is located two sealing washer outsides that await measuring, and the rotational force system is connected to the one end of test axle, and oiling system and row oil system all connect in the constant temperature lubricating oil system.
Furthermore, the test box body comprises a shell, a through hole structure is arranged in the middle of the shell, the test shaft is arranged in the through hole of the shell, and end covers used for installing and fixing the test shaft are arranged at two ends of the shell.
Furthermore, a bearing is arranged between the test shaft and the end cover, and a sealing ring is arranged between the end cover and the bearing.
Furthermore, the two ends of the test shaft are both provided with stepped shafts, the end cover at one end of the test shaft is a plugging cover, the end cover is fixedly connected with the shell through bolts, and one end of the test shaft and the bearing of the end cover are arranged in the shell.
Furthermore, a bearing sleeve is arranged between the end cover and the shell, the bearing is arranged in the bearing sleeve, and the bearing sleeve and the end cover are provided with coaxial connecting through holes and are fixedly connected with the end part of the shell through bolts.
Furthermore, the bearing is arranged in the shell, the shell is radially provided with two oil holes, and the two oil holes are communicated to the lubricating oil system.
Furthermore, a through hole is formed in an end cover at the other end of the test shaft, and a bearing and a sealing ring are arranged between the end cover and the other end of the test shaft; the outside of two sealing rings to be measured all is equipped with a sealed oil leakage mouth, and the valve is installed to sealed oil leakage mouth, and the export lower extreme of valve is equipped with weighing device.
Furthermore, the constant temperature lubricating oil system comprises a constant temperature oil tank, an oil outlet of the constant temperature oil tank is connected to one oil through hole in the side wall of the test box body through an oil pipe, an oil inlet of the constant temperature oil tank is connected to the other oil through hole in the side wall of the test box body through an oil pipe, and a power pump is arranged on the oil outlet of the constant temperature oil tank and the oil through hole connecting channel of the test box body.
Furthermore, the rotating power system comprises a driving motor, an output shaft of the driving motor is connected to one end of the test shaft through a coupler, and a rotating speed and torque sensor for detecting output rotating speed and torque values is arranged on the output shaft of the driving motor.
A rotary dynamic seal loss test method comprises the following steps:
s1, mounting the sealing ring to be tested on the test shaft, assembling the sealing ring to be tested in the test box, connecting the test shaft to a rotary power system, and connecting the oil through hole of the test box to a constant-temperature lubricating oil system;
s2, starting the rotary power system until the test shaft reaches a set rotating speed, simultaneously introducing constant-temperature and constant-pressure lubricating oil into the test box body by using a constant-temperature lubricating oil system, adjusting a valve on a sealing oil leakage port until no oil leaks from a leakage detection port, recording the torque value of the test shaft at the moment, and simultaneously obtaining the leakage amount of the test shaft when the test shaft reaches the set rotating speed;
s3, disassembling the sealing ring to be tested, reassembling the testing shaft, enabling the rotating speed of the testing shaft to reach the set rotating speed in the step S2, simultaneously introducing constant-temperature and constant-pressure lubricating oil which is the same as that in the step S2, and obtaining the torque value of the testing shaft without leakage of oil, wherein the difference between the torque value obtained in the step S2 and the torque value obtained in the step S3 is the power loss of the two sealing rings under the working condition.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a rotary dynamic seal loss testing device, which adopts a testing box body and a testing shaft which can be rotatably arranged in the testing box body to form a testing structure of a rotating shaft sealing structure, wherein two sealing rings to be tested are arranged between the testing shaft and the inner wall of the testing box body at intervals along the axial direction of the testing shaft, an oil groove is arranged between the two sealing rings to be tested on the inner wall of the testing box body, constant-temperature and constant-pressure lubricating oil is introduced, so that the sealing rings to be tested can reach the torque of the testing shaft under the sealing condition under different temperature and lubricating pressure conditions, and then the torque of the testing shaft without the sealing rings to be tested can be detected under the same working condition, thereby obtaining the power loss of the rotary dynamic seal. The invention can accurately obtain the power loss of the sealing ring and greatly improve the detection precision and the detection efficiency.
Furthermore, the middle of the shell is of a through hole structure, the test shaft is arranged in the through hole of the shell, and the two ends of the shell are provided with end covers used for installing and fixing the test shaft, so that the test shaft is convenient to install and disassemble, and is beneficial to adjusting the sealing environment.
Furthermore, a bearing is arranged between the testing shaft and the end cover, and a sealing ring is arranged between the end cover and the bearing, so that the power loss of the testing shaft is reduced, and the detection precision is improved.
Furthermore, the bearing sets up in the casing, and two oilholes have been seted up along radial to the casing, and two oilholes communicate to the lubricating oil system, adopt lubricating system, further ensure the sealed environment of test axle, improve and detect the precision.
According to the rotary dynamic seal loss testing method, rotary dynamic seal loss parameters can be rapidly detected and obtained, the rotary dynamic seal loss detection efficiency is improved, meanwhile, the sealing oil leakage port is formed in the side wall of the testing box body and located between the leakage detection port and the to-be-tested sealing ring, the leakage amount of the testing shaft reaching the set rotating speed can be obtained, and detection of two kinds of data can be achieved at one time.
Drawings
FIG. 1 is a system diagram of a rotary dynamic seal loss testing apparatus and method.
Fig. 2 is a cross-sectional view of the test chamber of fig. 1.
In the figure: 1. a drive motor; 2. a rotational speed torque sensor; 3. a coupling; 4. testing the box body; 5. a pressure transmitter; 6. a valve; 7. a measuring cup; 8. a weighing platform; 9. a power pump; 10. a constant temperature oil tank; 11. an electric heating wire; 12. a refrigeration system; 13. a rack; 14. a control system; 15. a thermal insulation pad; 16. a support frame; 17. a housing; 18. an end cap; 19. testing the shaft; 20. a seal ring; 21. a bearing; 22. a sealing ring to be tested; 23. a sealed oil outlet; 24. a bearing lubricant inlet; 25. a bearing lubricant outlet; 26. a leak detection port; 27. sealing the oil leakage port; 28. the oil inlet is sealed.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, a rotary dynamic seal loss testing device comprises a testing box body 4 and a testing shaft 19 which is rotatably arranged in the testing box body 4, wherein two sealing rings 22 to be tested are arranged between the testing shaft 19 and the inner wall of the testing box body 4 at intervals along the axial direction of the testing shaft 19, an oil groove is arranged between the two sealing rings 22 to be tested on the inner wall of the testing box body 4, two oil through holes communicated with the oil groove are formed in the side wall of the testing box body 4, and the two oil through holes are connected to a constant-temperature lubricating oil system; the leakage detection mouth 26 in the intercommunication test box 4 is seted up to test box 4 lateral wall, and leakage detection mouth 26 is located two sealing washer 22 outsides that await measuring, and the sealing washer 22 that awaits measuring promptly is located between leakage detection mouth 26 and the oil groove, and two sealing washer 22 outsides that await measuring of this application all are equipped with one and leak detection mouth 26, and rotational force system is connected to the one end of test axle 19, and oiling system and oil discharge system all connect in constant temperature lubricating oil system.
Specifically, as shown in fig. 2, the test box 4 includes a housing 17, a through hole structure is formed in the middle of the housing 17, the test shaft 19 is disposed in the through hole of the housing 17, end caps 18 for mounting and fixing the test shaft 19 are disposed at two ends of the housing 17, a bearing 21 is disposed between the test shaft 19 and the end caps 18, a seal ring 20 is disposed between the end caps 18 and the bearing 21, and the seal ring 20 is a lip-shaped seal ring. Both ends of the test shaft 19 are provided with stepped shafts, the end cover 18 at one end of the test shaft 19 is a blocking cover, the end cover 18 is fixedly connected with the shell 17 through bolts, one end of the test shaft 19 and a bearing of the end cover 18 are arranged in the shell 17, a bearing sleeve can be arranged, the bearing sleeve is arranged on the outer side of the bearing, the bearing sleeve is arranged between the end cover 18 and the shell 17, and the bearing sleeve and the end cover 18 are provided with coaxial connecting through holes and are fixedly connected with the end part of the shell 17 through bolts.
The bearing is disposed in the housing 17, and the housing 17 is radially provided with two oil holes, as shown in fig. 2, one of the oil holes is a bearing lubricating oil inlet 24, the other is a bearing lubricating oil outlet 25, and the bearing lubricating oil inlet 24 and the bearing lubricating oil outlet 25 are communicated to a lubricating oil system. The bearing sleeve is sleeved on the outer side of the bearing, and the oil hole is formed in the bearing sleeve. This application test axle 19 adopts the hollow shaft to reduce the inertia of axle, reduce the experimental error.
The end cover 18 at the other end of the test shaft 19 is provided with a through hole, a bearing and a sealing ring 20 are arranged between the end cover 18 and the other end of the test shaft 19, the bearing is used for reducing the rotation friction force of the test shaft 19, the detection precision is improved, and the sealing ring is adopted to prevent the test shaft from leaking oil along the axial direction.
As shown in fig. 2, a support frame 16 is fixed to the lower end of the housing 17 for supporting and mounting the housing 17, and the bottom of the support frame 16 is provided with a heat insulating pad 15.
Specifically, the side wall of the test box body 4 is located between the leakage detection port 26 and the sealing ring 22 to be tested, a sealing oil leakage port 27 is arranged, the valve 6 is installed at the sealing oil leakage port 27, and a weighing device is arranged at the lower end of an outlet of the valve 6 and used for weighing the amount of leaked oil. The weighing device comprises a measuring cup 7 and a weighing platform 8 arranged on the measuring cup 7, and the weighing platform 8 is arranged on a rack 13. After the test shaft 19 and the sealing ring 22 to be tested are installed, the rotational power system is started until the test shaft reaches a set rotating speed, oil leaks when the test shaft 19 and the sealing ring 22 to be tested normally seal, the valve on the sealing oil leakage port 27 is adjusted until the leakage detection port 26 does not leak oil, the leakage oil is completely leaked through the sealing oil leakage port 27, the measured value of 27 is guaranteed to be accurate, and the leakage amount is obtained by using the measuring cup.
The constant-temperature lubricating oil system comprises a constant-temperature oil tank 10, an oil outlet of the constant-temperature oil tank 10 is connected to an oil through hole (a sealing oil inlet 28) in the side wall of the testing box body 4 through an oil pipe, an oil inlet of the constant-temperature oil tank 10 is connected to another oil through hole (a sealing oil outlet 23) in the side wall of the testing box body 4 through an oil pipe, and a power pump is arranged on an oil outlet of the constant-temperature oil tank 10 and an oil through hole connecting pipeline of the testing box body 4 and used for providing constant-pressure lubricating oil.
The oil outlet of the constant-temperature oil tank 10 is also connected to a bearing lubricating oil inlet 24 through a pipeline, a bearing lubricating oil outlet 25 is connected to the constant-temperature oil tank 10 through an oil pipe, and a power pump 9 is arranged on the oil outlet of the constant-temperature oil tank 10 and the oil pipe pipeline of the bearing lubricating oil inlet 24.
An electric heating wire 11 is arranged in the constant-temperature oil tank 10 and used for heating oil temperature; the constant-temperature oil tank 10 is connected with a refrigerating system 12, and the oil temperature in the constant-temperature oil tank 10 achieves a constant-temperature effect through an electric heating wire 11 and the refrigerating system 12.
The rotary power system comprises a driving motor 1, an output shaft of the driving motor 1 is connected to one end of a test shaft 19 through a coupler 3, and a rotating speed and torque sensor 2 is arranged on the output shaft of the driving motor 1 and used for detecting output rotating speed and torque values. The refrigeration system further comprises a control system 14, and the power pump, the driving motor 1, the electric heating wire 11 and the refrigeration system 12 are all connected to the control system 14. The sealing oil inlet 28, the sealing oil leakage port 27, the bearing lubricating oil inlet 24 and the oil tank 10 are respectively provided with a temperature sensor for detecting temperature, and the temperature sensors are connected to a control system.
As shown in fig. 1 and 2, when a test is performed, the control system 14 controls the driving motor 1 to output a constant rotating speed to the test box; controlling the temperature in the constant-temperature oil tank 10 by controlling the electric heating wire 11 and the start and stop of the refrigerating system in a closed loop; the sealing oil and the lubricating oil with specific pressure and temperature are pumped to a sealing oil inlet and a bearing lubricating oil inlet by a closed-loop control power pump; the sealing oil leaks to two sides through the sealing ring to be measured and is discharged from a leakage port, the leaked oil is conveyed to the measuring cup through a valve switch, and the leakage flow is measured in real time by using a weighing sensor; in order to avoid the introduction of measurement errors of a bearing, a coupler and the like, torque measurement for installing the sealing ring to be measured and torque measurement for removing the sealing ring to be measured are respectively carried out at the same temperature and pressure, and the difference value is the power loss of the two sealing rings to be measured.
A rotary dynamic seal loss test method comprises the following steps:
step 1: installing the sealing ring to a specified position according to the requirement of a test system, opening a pipeline valve of a sealed oil outlet, and adjusting the pipeline valve of the sealed oil leakage port to enable the leaked oil outlet and an oil tank to form a passage;
step 2: starting an electric heating wire or refrigeration equipment, and controlling the temperature of the oil tank to be within an experimental range value;
and step 3: starting a gear pump of a bearing lubricating oil pipeline to ensure the pressure stability of lubricating oil;
and 4, step 4: starting a sealed oil pipeline gear pump to enable the experimental box body to reach a thermal balance state;
and 5: starting a driving motor to ensure that the driving motor rotates at a set rotating speed;
step 6: the pressure in the sealing oil inlet cavity is stabilized at a set value by adjusting a sealing oil pipeline gear pump and a sealing oil outlet valve;
step 6: after the system is stable, adjusting a pipeline valve of a sealed oil leakage port to enable leaked oil to enter a measuring cup, and obtaining leakage amount by using the measuring cup;
and 7: when the leakage detection port does not have oil to flow out, collecting the inlet pressure and temperature of sealing oil, the temperature of the leakage port, the temperature and pressure of bearing lubricating oil, the rotating speed and torque and the numerical value of a weighing sensor in a period of time; if oil flows out of the leakage detection port, the test device is checked to repeat the operation until no oil flows out, and then the next step can be carried out;
and 8: the driving motor is closed, the refrigeration and heating system works to close all the equipment after the equipment is close to normal temperature, and all the equipment can be closed to wait for natural cooling when the temperature difference is not too large;
and step 9: disassembling the sealing ring to be tested, ensuring that the pressure, the temperature and the rotating speed of each inlet are correspondingly equal to those in the step 7 according to the process, and collecting corresponding torque values;
step 10: and (4) obtaining the leakage rate of the sealing ring according to the indicating value curve of the weighing sensor in the step (7) and the difference value of the torques acquired in the step (7) and the step (9), namely the power loss of the two sealing rings under the working condition.
The above examples are only for illustrating the concept and the application method of the present invention, and are intended to make the skilled person understand the present invention, and should not be used to limit the scope of the present invention. All the changes and modifications of the embodiments based on the concept of the present invention are within the scope of the present invention.
Claims (3)
1. A rotary dynamic seal loss testing device is characterized by comprising a testing box body (4) and a testing shaft (19) which is rotatably arranged in the testing box body (4), wherein two sealing rings (22) to be tested are arranged between the testing shaft (19) and the inner wall of the testing box body (4) at intervals along the axial direction of the testing shaft (19), an oil groove is arranged between the two sealing rings (22) to be tested on the inner wall of the testing box body (4), two oil through holes communicated with the oil groove are formed in the side wall of the testing box body (4), and the two oil through holes are connected to a constant-temperature lubricating oil system; the side wall of the test box body (4) is provided with a leakage detection port (26) communicated with the interior of the test box body (4), the leakage detection port (26) is positioned at the outer sides of two sealing rings (22) to be tested, one end of a test shaft (19) is connected with a rotary power system, an oil injection system and an oil discharge system are both connected with a constant-temperature lubricating oil system, the test box body (4) comprises a shell (17), the middle of the shell (17) is of a through hole structure, the test shaft (19) is arranged in the through hole of the shell (17), the two ends of the shell (17) are provided with end covers (18) used for installing and fixing the test shaft (19), a bearing (21) is arranged between the test shaft (19) and the end covers (18), a sealing ring (20) is arranged between the end covers (18) and the bearing (21), the two ends of the test shaft (19) are both provided with stepped shafts, the end cover (18) at one end of the test shaft (19) is a blocking cover, the end cover (18) is fixedly connected with the shell (17) through bolts, one end of a test shaft (19) and a bearing of an end cover (18) are arranged in a shell (17), a bearing sleeve is arranged between the end cover (18) and the shell (17), the bearing is arranged in the bearing sleeve, the bearing sleeve and the end cover (18) are provided with coaxial connecting through holes and are fixedly connected with the end part of the shell (17) through bolts, the bearing is arranged in the shell (17), the shell (17) is radially provided with two oil holes which are communicated with a lubricating oil system, the end cover (18) at the other end of the test shaft (19) is provided with a through hole, and a bearing and a sealing ring (20) are arranged between the end cover (18) and the other end of the test shaft (19); a sealing oil leakage opening (27) is formed in the side wall of the testing box body (4) and located between the leakage detection opening (26) and the sealing ring (22) to be tested, a valve (6) is installed on the sealing oil leakage opening (27), and a weighing device is arranged at the lower end of an outlet of the valve (6); the constant-temperature lubricating oil system comprises a constant-temperature oil tank (10), an oil outlet of the constant-temperature oil tank (10) is connected to an oil through hole in the side wall of the testing box body (4) through an oil pipe, an oil inlet of the constant-temperature oil tank (10) is connected to another oil through hole in the side wall of the testing box body (4) through an oil pipe, and a power pump is arranged on an oil outlet of the constant-temperature oil tank (10) and an oil through hole connecting channel of the testing box body (4).
2. The rotary dynamic seal loss testing device according to claim 1, characterized in that the rotary dynamic system comprises a driving motor (1), an output shaft of the driving motor (1) is connected to one end of the testing shaft (19) through a coupling (3), and a rotating speed and torque sensor (2) for detecting output rotating speed and torque values is arranged on the output shaft of the driving motor (1).
3. A rotary dynamic seal loss test method based on the rotary dynamic seal loss test apparatus according to claim 1, characterized by comprising the steps of:
s1, mounting the sealing ring to be tested on the test shaft, assembling the sealing ring to be tested in the test box, connecting the test shaft to a rotary power system, and connecting the oil through hole of the test box to a constant-temperature lubricating oil system;
s2, starting the rotary power system until the test shaft reaches a set rotating speed, simultaneously introducing constant-temperature and constant-pressure lubricating oil into the test box body by using a constant-temperature lubricating oil system, adjusting a valve on a sealing oil leakage port until no oil leaks from a leakage detection port, recording the torque value of the test shaft at the moment, and simultaneously obtaining the leakage amount of the test shaft when the test shaft reaches the set rotating speed;
s3, disassembling the sealing ring to be tested, reassembling the testing shaft, enabling the rotating speed of the testing shaft to reach the set rotating speed in the step S2, simultaneously introducing constant-temperature and constant-pressure lubricating oil which is the same as that in the step S2, and obtaining the torque value of the testing shaft without leakage of oil, wherein the difference between the torque value obtained in the step S2 and the torque value obtained in the step S3 is the power loss of the two sealing rings under the working condition.
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| CN114518198B (en) * | 2022-03-10 | 2023-06-27 | 湖南科技大学 | Deep sea rotary machine end face seal leakage and sampling detection test device |
| CN114544088B (en) * | 2022-03-10 | 2023-06-27 | 湖南科技大学 | Deep sea combined sealing ring sealing leakage and sampling detection test device |
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| CN101566523B (en) * | 2009-05-11 | 2011-04-13 | 中能电力科技开发有限公司 | Method for monitoring state of gear case of wind generating set |
| CN103115755A (en) * | 2011-11-16 | 2013-05-22 | 中国北方车辆研究所 | Motive seal thermal failure test method |
| CN103115727A (en) * | 2011-11-17 | 2013-05-22 | 中国北方车辆研究所 | Motive seal leakage comprehensive test method |
| CN202947824U (en) * | 2012-10-26 | 2013-05-22 | 青岛海力威新材料科技股份有限公司 | Torsion value measuring tool for oil sealed product |
| CN105201814B (en) * | 2015-09-09 | 2017-03-22 | 浙江大学 | Device for measuring stirring loss caused by high-speed rotating element of axial plunger pump/motor |
| CN105352683A (en) * | 2015-11-21 | 2016-02-24 | 重庆平波机械有限公司 | Airtightness detection mechanism |
| CN111024329B (en) * | 2019-12-28 | 2021-09-07 | 清华大学 | High-pressure rotation combined sealing element performance detection and test device and method |
| CN112683523A (en) * | 2020-12-22 | 2021-04-20 | 安庆帝伯功能塑料有限公司 | Dynamic sealing ring testing machine |
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