CN114754944A - Positive/negative pressure dynamic sealing performance test platform - Google Patents
Positive/negative pressure dynamic sealing performance test platform Download PDFInfo
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- CN114754944A CN114754944A CN202210399664.4A CN202210399664A CN114754944A CN 114754944 A CN114754944 A CN 114754944A CN 202210399664 A CN202210399664 A CN 202210399664A CN 114754944 A CN114754944 A CN 114754944A
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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
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The invention relates to the field of sealing element performance testing devices, in particular to a positive/negative pressure dynamic sealing performance testing platform. The device comprises a test module, a power module, a pressure aqueous medium supply module and a leakage measurement module; the seals to be tested were placed in a mechanical seal arrangement provided within the pressure chamber. In the testing process, positive/negative aqueous mediums of the pressure aqueous medium supply module provide different stable positive pressure and negative pressure environments, a torque and speed sensor arranged on the power module and a matching frequency modulator provide driving torque required for overcoming friction for a tested sealing element, and the problem of reduction of the service life of the tested sealing element caused by instability of the driving torque is avoided; and the sealing cavity where the tested sealing element is located is directly connected with the leakage quantity measuring device, so that the accuracy of the obtained sealing leakage quantity is ensured. The invention has simple structure, and can test the sealing performance and the reliability of the sealing operation when the sealing end surface of the tested sealing element is influenced by radial and axial vibration in a high-pressure liquid environment.
Description
Technical Field
The invention relates to the field of sealing element performance testing devices, in particular to a positive/negative pressure dynamic sealing performance testing platform.
Background
The cavitation water tunnel is mainly used for hydrodynamic tests and noise tests of an underwater vehicle and a propeller thereof. In order to accurately obtain the hydrodynamic characteristics of the test model, the leakage rate of the hole body needs to be reduced as much as possible, so that higher requirements are put on the sealing of the water hole, and the sealing also relates to the reliability of equipment and personal safety.
The water tunnel body sealing comprises static sealing and dynamic sealing, wherein the static sealing mainly comprises sealing at a section joint and the like, O-shaped rubber sealing is mainly adopted, and relatively mature experience exists at home and abroad. The dynamic seal test at the present stage depends on the accumulation of experience and test technology for statistics, is influenced by factors such as water hole pressure increasing and reducing working conditions, water flow corrosion and the like, and is difficult to accurately judge the performance of the tested sealing element only by depending on the accumulation of experience and test result statistics. Therefore, dynamic seal testing needs to be optimized, sealing requirements are strictly guaranteed, the service life of the seal is prolonged as far as possible, and workload such as later-stage replacement is reduced.
Disclosure of Invention
The invention aims to provide a positive/negative pressure dynamic sealing performance test platform which is used for testing the dynamic sealing performance and the sealing work reliability of a dynamic sealing piece under the influence of torsion, axial vibration and radial vibration in a high-pressure liquid environment so as to select the sealing piece with excellent comprehensive performance.
In order to realize the purpose, the invention adopts the following technical scheme:
a positive/negative pressure dynamic sealing performance test platform comprises a test module, a power module, a support, a pressure aqueous medium supply module and a leakage measurement module;
the test module comprises a pressure cavity, wherein a mechanical sealing device is arranged in the pressure cavity and consists of a first sealing stator, a second sealing stator and a sealing rotor; the first sealing stator and the second sealing stator have the same structure and are respectively arranged at two ends of the sealing rotor; a first tested sealing element is arranged between the first sealing stator and the sealing rotor, and a second tested sealing element is arranged between the second sealing stator and the sealing rotor; the first tested sealing element, the end face of the first sealing stator and the end face of one end of the sealing rotor enclose a first sealing cavity, and a first leakage measuring port is arranged on the first sealing cavity; a second tested sealing element, the end face of a second sealing stator and the end face of the other end of the sealing rotor form a second sealing cavity in a surrounding manner, and a second leakage measuring port is formed in the second sealing cavity;
the power module comprises a driving device and a main shaft connected with the driving device, the main shaft penetrates into the pressure cavity, penetrates through the first sealing stator and the sealing rotor and then is abutted against the second sealing stator to provide rotating power for the first tested sealing element and the second tested sealing element;
the pressure water medium supply module supplies water to the pressure cavity, the first sealing cavity and the second sealing cavity at high pressure;
the leakage measuring module comprises a leakage measuring device which is communicated with the first sealing cavity through a first leakage measuring port; the second seal cavity is communicated with the second leakage measuring port; and the dynamic seal test of the tested sealing element is realized by detecting the leakage amount of the first sealing cavity and the second sealing cavity.
Furthermore, the main shaft is a stepped shaft, one end of the main shaft close to the driving device is supported by two tapered roller bearings and fixed on a bearing box through the two tapered roller bearings, and the bearing box is installed on a support of the platform and used for driving the sealing rotor to rotate under the driving of the driving device.
Further, a gasket is arranged between the shaft shoulder of the main shaft and the sealing rotor, and a gap amount adjusting sleeve is coaxially arranged on the outer side of the sealing rotor; the initial compression amount of the first tested sealing element is adjusted by adjusting the thickness of the gasket, and the initial compression amount of the second tested sealing element is adjusted by adjusting the height of the gap adjusting sleeve.
Further, the power module further comprises a torque and rotating speed sensor and a frequency modulator; the torque sensor is used for detecting the rotating speed and the transmission torque of the driving device in real time, the input end of the torque sensor is connected with the driving device, and the output end of the torque sensor is connected with the main shaft; the frequency modulator is respectively electrically connected with the driving device and the torque sensor, and the rotating speed of the driving device is changed by changing the power frequency of the driving device according to the rotating speed detected by the torque sensor and the change of the transmission torque.
Furthermore, the driving device is a worm speed reducing motor, and the worm speed reducing motor, the torque rotating speed sensor and the frequency modulator are all fixed on a support of the platform.
Further, the pressure aqueous medium supply module comprises a water pump, a first two-position three-way reversing valve and a second two-position three-way reversing valve for controlling the flowing direction of liquid, an air storage tank, an air compressor for providing pressure dry air for the air storage tank, a pressure reducing valve for keeping the air pressure of the system constant and a water tank;
the input end of the water pump is connected with the water tank through the first two-position three-way reversing valve, and the output end of the water pump is connected with the first end of the second two-position three-way reversing valve; the second end of the second two-position three-way reversing valve is connected with a water filling port of the pressure cavity, and the third end of the second two-position three-way reversing valve is connected with a gas storage tank; a fifth stop valve and a third stop valve are arranged between the second two-position three-way reversing valve and a water filling port of the pressure cavity, and a fourth stop valve and a first stop valve are arranged between the second two-position three-way reversing valve and the gas storage tank; the air storage tank is connected with the air compressor through a pressure reducing valve, and a second stop valve is arranged between the pressure reducing valve and the air storage tank.
Furthermore, a filter for filtering liquid impurities is arranged between the first two-position three-way reversing valve and the water tank, and the accumulator tank is also connected with a pressure gauge for measuring the air pressure of the accumulator tank.
Compared with the prior art, the invention has the following beneficial effects due to the adoption of the technical scheme:
1. the invention has relatively simple structure, and can test the sealing performance and the reliability of sealing operation when the sealing end face of the tested sealing element is influenced by radial and axial vibration in a high-pressure liquid environment.
2. The torque and speed sensor arranged through the power module measures the driving device, the rotating speed and the transmission torque in real time, on the basis, the rotating speed of the driving device is changed by matching with the frequency modulator, the driving torque required for overcoming friction is provided for the tested sealing element, and meanwhile, the problem that the service life of the tested sealing element is shortened due to the fact that the driving torque is unstable is solved.
3. The first sealing cavity and the second sealing cavity are directly connected with the leakage quantity measuring device, and the accuracy of the obtained sealing leakage quantity is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present invention;
FIG. 2 is a simplified block diagram of the test module of FIG. 1;
reference numerals:
1. an air compressor; 2. a pressure reducing valve; 3. a first shut-off valve; 4. a second stop valve; 5. a pressure gauge; 6. a gas storage tank; 7. a test module; 8. a third stop valve; 9. a leakage measuring cylinder; 10. a filter; 11. a water tank; 12. a first two-position three-way reversing valve; 13. a water pump; 14. a second two-position three-way directional valve; 15. a fourth stop valve; 16. a fifth stop valve; 17. connecting a screw rod; 18-1, a pressure chamber; 18-2, a second sealed cavity; 18-3, a first sealed cavity; 19-1, a first leakage measurement port; 19-2, a second leakage measurement port; 20-1, a second sealing ring; 20-2, a first sealing ring; 21. a gasket; 22. a main shaft; 23. a tapered roller bearing; 24. a worm gear motor; 25. a support; 26. a torque sensor; 27. a bearing housing; 28. a first sealed stator; 29. a water injection inlet; 30-1, a first water injection plug; 30-1, a second water injection plug; 31. a clearance amount adjusting sleeve; 32. sealing the rotor; 33. a second sealed stator; 34-pressure chamber cover.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, the positive/negative pressure dynamic sealing performance test platform provided by the invention comprises a test module, a power module, a support 25, a leakage measurement module and a pressure aqueous medium supply module. The power module is arranged on a support 25 of the test platform, the power module provides power for the test module, the pressure water medium supply module provides high-pressure water medium for the test module, and the leakage measurement module is used for measuring the leakage amount of the test platform. The test module comprises a pressure chamber 18 in which a mechanical sealing arrangement is arranged, which consists of a first sealing stator 28, a second sealing stator 33 and a sealing rotor 32. The first and second sealing stators 28 and 33 are identical in structure and are respectively provided at both ends of the sealing rotor 32. The outer side of the sealing rotor 32 is coaxially sleeved with a clearance adjusting sleeve 31, and the first sealing stator 28 and the second sealing stator 33 are connected through connecting rod screws 17 which are uniformly distributed on the circumference.
A first sealing ring 20-2 is arranged between the first sealing stator 28 and the sealing rotor 32, and a second sealing ring 20-1 is arranged between the second sealing stator 33 and the sealing rotor 32; the first sealing ring 20-2, the end face of the first sealing stator 28 and the end face of one end of the sealing rotor 32 enclose a first sealing cavity 18-3, and a first leakage measuring port 19-1 is arranged on the first sealing cavity 18-3; the second sealing ring 20-1, the end face of the second sealing stator 33 and the end face of the other end of the sealing rotor 32 enclose a second sealing cavity 18-2, and a second leakage measuring port 19-2 is arranged on the second sealing cavity 18-2.
The power module is arranged on a support 25 of the test platform and comprises a worm speed reducing motor 24, a torque and rotating speed sensor 26, a frequency modulator and a main shaft 22. A worm gear motor 24 powers the test module. The torque and speed sensor 26 is used for detecting the speed and the transmission torque of the driving device in real time, the input end of the torque and speed sensor is connected with a turbine shaft of the worm speed reducing motor 24, and the output end of the torque and speed sensor is connected with one end of the main shaft 22; the frequency modulator is electrically connected to the driving device and the torque sensor, respectively, and changes the power frequency of the driving device according to the change of the rotation speed and the transmission torque detected by the torque sensor 26 to change the rotation speed of the driving device. The main shaft 22 is a stepped shaft, and the other end of the main shaft 22 penetrates into the pressure chamber 18-1, penetrates through the first sealing stator 28 and the sealing rotor 32, and then abuts against the second sealing stator 30-2, and provides rotating power for the first sealing ring 20-1 and the second sealing ring 20-1 under the driving of the turbine motor 22. One end of the main shaft close to the driving device is supported by two tapered roller bearings 23 and is fixed on a bearing box 27 through the tapered roller bearings, and the bearing box 27 is arranged on a support 25 of the platform; a gasket 21 is arranged between the shaft shoulder and the sealing rotor 32, when in use, the initial compression amount of the first sealing ring 20-1 can be adjusted by adjusting the thickness of the gasket 21, and the initial compression amount of the second sealing ring 20-1 can be adjusted by adjusting the height of the gap adjusting sleeve 31.
The leakage measuring module comprises a leakage measuring device which is a leakage measuring cylinder and is communicated with the first sealing cavity 18-3 through a first leakage measuring port 19-1; the second sealed cavity 18-2 is communicated through a second leakage measuring port 19-2; and the dynamic seal test of the tested sealing element is realized by detecting the leakage amount of the first sealing cavity and the second sealing cavity.
The pressure water medium supply module comprises a water pump 13, a first two-position three-way reversing valve 12 and a second two-position three-way reversing valve 14 for controlling the flowing direction of liquid, an air storage tank 6, an air compressor 1 for providing pressure dry air for the air storage tank, a pressure reducing valve 2 for keeping the air pressure of the system constant and a water tank 10; the input end of the water pump 13 is connected with the water tank 11 through a pipeline, and the output end of the water pump is connected with the first end of a second two-position three-way reversing valve 14; the second end of the second two-position three-way reversing valve 14 is connected with a water filling port 29 of the pressure cavity, and the third end is connected with the gas storage tank 6; a fifth stop valve 16 and a third stop valve 8 are arranged between the second two-position three-way reversing valve 14 and a water filling port 29 of the pressure cavity, and a fourth stop valve 15 and a first stop valve 3 are arranged between the second two-position three-way reversing valve 14 and the air storage tank 6; the gas holder 6 is connected with an air compressor 1 and a pressure gauge 5, a pressure reducing valve 2 is arranged between the gas holder 6 and the air compressor 1, and a second stop valve 4 is arranged between the pressure reducing valve 2 and the gas holder 6. In specific implementation, in order to reduce impurities in water, a filter 10 is further arranged at an output port of the water tank.
In the test preparation stage, a pressure cavity 18-1, a first sealing cavity 18-3 and a second sealing cavity 18-2 are filled with normal-pressure aqueous medium, wherein the aqueous medium of the pressure cavity 18-1 is filled by an aqueous medium supply module, plugs are arranged on the cavities of the first sealing cavity 18-3 and the second sealing cavity 18-2, and the aqueous medium of the two cavities is filled by the aqueous medium supply module and then plugged by the plugs 30-1 and 30-2 arranged on the respective cavities.
The positive/negative pressure dynamic sealing performance test platform of the embodiment can perform positive pressure and negative pressure sealing tests on a tested sealing piece according to test requirements:
the positive pressure seal test procedure was as follows:
step 1, filling water into a pressure cavity 18-1 and two sealing cavities of the test module: the first two-position three-way reversing valve 12 and the second two-position three-way reversing valve 14 are lower passages, the fourth stop valve 15 is closed, the fifth stop valve 16 is communicated, and the plug 30-2 on the first sealing cavity 18-3 and the plug 30-1 on the second sealing cavity 18-2 are opened. And (3) starting the water pump 13, closing the plug 30-2 and the plug 30-1 when water flows in the leakage measuring cylinder 9, closing the pressure cavity cover 34 in the test module, opening the third stop valve 8 thirdly, and closing the motor of the water pump 13, the third stop valve 8 and the fifth stop valve 16 after the water filling process of the main machine is finished when backflow water exists.
Step 2, filling water into the gas storage tank 6: the first two-position three-way selector valve 12 and the second two-position three-way selector valve 14 maintain the low position passage, the fifth cut-off valve 16 is closed, and the first cut-off valve 3 and the fourth cut-off valve 15 are opened. And (3) starting the water pump 13, stopping the motor of the water pump when the water filling is finished when the liquid level in the gas storage tank 6 reaches half of the total water storage amount, and closing the first stop valve 3 and the fourth stop valve 15.
Step 3, positive pressure test pressure water supply: and starting the air compressor 1, adjusting the pressure reducing valve 2 to the required test pressure, and opening the second stop valve 4, the fourth stop valve 15 and the fifth stop valve 16. And recording the initial scale of the leakage measuring cylinder 9, starting the worm speed reducing motor 24 and adjusting the rotating speed to a required value until the test time is ended. And closing the fourth stop valve 15, stopping the worm speed reducing motor 24, recording the liquid level scale of the leakage measuring cylinder 9, pumping out the host water medium and detaching the two sealing rings.
The negative pressure seal test procedure was as follows:
step 1, filling water into the pressure cavity 18-1 and the two sealing cavities of the test module in the same manner as the water filling manner of the positive pressure sealing test.
Step 2, filling water into the gas storage tank 6: the first two-position three-way selector valve 12 and the second two-position three-way selector valve 14 maintain the low position passage, the fifth cut-off valve 16 is closed, and the first cut-off valve 3 and the fourth cut-off valve 15 are opened. And (3) starting the water pump 13, stopping the water pump motor and closing the first stop valve 3 and the third stop valve 15 after the air storage tank 6 is filled with the water medium and the air storage tank 6 is filled with water during normal backflow.
Step 3, supplying negative pressure test pressure water: adjusting the first two-position three-way reversing valve 12 and the second two-position three-way reversing valve 14 to be upper passages, opening the stop valve 15 in the fourth step, starting the water pump motor, pumping out part of the water medium in the gas storage tank 6 to enable the pressure in the gas storage tank 6 to reach the saturated vapor pressure, stopping the water pump motor, and opening the fifth stop valve 16. The worm gear motor 24 is started and the initial calibration of the leakage measuring cylinder 9 is recorded until the end of the test time. And closing the fourth stop valve 15, stopping the worm speed reducing motor 24, recording the liquid level scale in the leakage measuring cylinder 9, pumping out the host machine aqueous medium, and detaching the sealing ring 20.
In the embodiment, the sealing ring is selected as the tested sealing element for the dynamic sealing test, and in practical application, other tested sealing elements which need to be subjected to the dynamic sealing test can also be subjected to the test by using the test platform provided by the invention. It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. The utility model provides a positive/negative pressure dynamic seal performance test platform, includes test module, power module, support, pressure aqueous medium supply module and reveals measuring module, its characterized in that:
the test module comprises a pressure cavity, wherein a mechanical sealing device is arranged in the pressure cavity and consists of a first sealing stator, a second sealing stator and a sealing rotor; the first sealing stator and the second sealing stator have the same structure and are respectively arranged at two ends of the sealing rotor; a first tested sealing element is arranged between the first sealing stator and the sealing rotor, and a second tested sealing element is arranged between the second sealing stator and the sealing rotor; the first tested sealing element, the end face of the first sealing stator and the end face of one end of the sealing rotor form a first sealing cavity in an enclosing manner, and a first leakage measuring port is arranged on the first sealing cavity; a second tested sealing element, the end face of a second sealing stator and the end face of the other end of the sealing rotor form a second sealing cavity in an enclosing manner, and a second leakage measuring port is arranged on the second sealing cavity;
the power module comprises a driving device and a main shaft connected with the driving device, and the main shaft penetrates into the pressure cavity, penetrates through the first sealing stator and the sealing rotor and then is abutted against the second sealing stator to provide rotating power for the first tested sealing element and the second tested sealing element;
the pressure water medium supply module supplies water to the pressure cavity, the first sealing cavity and the second sealing cavity at high pressure;
the leakage measuring module comprises a leakage measuring device which is communicated with the first sealing cavity through a first leakage measuring port; the second seal cavity is communicated with the second leakage measuring port; and the dynamic seal test of the tested sealing element is realized by detecting the leakage amount of the first sealing cavity and the second sealing cavity.
2. The positive/negative pressure dynamic sealing performance test platform of claim 1, wherein: the main shaft is a stepped shaft, one end of the main shaft, which is close to the driving device, is supported by two tapered roller bearings and is fixed on a bearing box by the two tapered roller bearings, and the bearing box is arranged on a support of the platform and is used for driving the sealing rotor to rotate under the driving of the driving device.
3. The positive/negative pressure dynamic sealing performance test platform of claim 1, characterized in that: a gasket is arranged between the shaft shoulder of the main shaft and the sealing rotor, and a clearance adjusting sleeve is coaxially arranged on the outer side of the sealing rotor; the initial compression amount of the first tested sealing element is adjusted by adjusting the thickness of the gasket, and the initial compression amount of the second tested sealing element is adjusted by adjusting the height of the gap adjusting sleeve.
4. The positive/negative pressure dynamic sealing performance test platform of claim 1, wherein: the power module also comprises a torque and rotating speed sensor and a frequency modulator; the torque sensor is used for detecting the rotating speed and the transmission torque of the driving device in real time, the input end of the torque sensor is connected with the driving device, and the output end of the torque sensor is connected with the main shaft; the frequency modulator is respectively electrically connected with the driving device and the torque sensor, and the rotating speed of the driving device is changed by changing the power frequency of the driving device according to the rotating speed detected by the torque sensor and the change of the transmission torque.
5. The positive/negative pressure dynamic sealing performance test platform of claim 4, wherein: the driving device is a worm speed reducing motor, and the worm speed reducing motor, the torque rotating speed sensor and the frequency modulator are all fixed on a support of the platform.
6. The positive/negative pressure dynamic sealing performance test platform of claim 1, wherein: the pressure water medium supply module comprises a water pump, a first two-position three-way reversing valve and a second two-position three-way reversing valve for controlling the flowing direction of liquid, an air storage tank, an air compressor for providing pressure dry air for the air storage tank, a pressure reducing valve for keeping the air pressure of the system constant and a water tank;
the input end of the water pump is connected with the water tank through the first two-position three-way reversing valve, and the output end of the water pump is connected with the first end of the second two-position three-way reversing valve; the second end of the second two-position three-way reversing valve is connected with a water filling port of the pressure cavity, and the third end of the second two-position three-way reversing valve is connected with a gas storage tank; a fifth stop valve and a third stop valve are arranged between the second two-position three-way reversing valve and a water filling port of the pressure cavity, and a fourth stop valve and a first stop valve are arranged between the second two-position three-way reversing valve and the gas storage tank; the air storage tank is connected with the air compressor through a pressure reducing valve, and a second stop valve is arranged between the pressure reducing valve and the air storage tank.
7. The positive/negative pressure dynamic seal performance test platform of claim 6, wherein: a filter for filtering liquid impurities is arranged between the first two-position three-way reversing valve and the water tank, and the accumulator tank is also connected with a pressure gauge for measuring the air pressure of the accumulator tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210399664.4A CN114754944A (en) | 2022-04-15 | 2022-04-15 | Positive/negative pressure dynamic sealing performance test platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210399664.4A CN114754944A (en) | 2022-04-15 | 2022-04-15 | Positive/negative pressure dynamic sealing performance test platform |
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| CN114754944A true CN114754944A (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210399664.4A Pending CN114754944A (en) | 2022-04-15 | 2022-04-15 | Positive/negative pressure dynamic sealing performance test platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435978A (en) * | 2022-11-08 | 2022-12-06 | 中国空气动力研究与发展中心高速空气动力研究所 | Air tightness detection device, system and detection method for wind tunnel sealing ring |
-
2022
- 2022-04-15 CN CN202210399664.4A patent/CN114754944A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435978A (en) * | 2022-11-08 | 2022-12-06 | 中国空气动力研究与发展中心高速空气动力研究所 | Air tightness detection device, system and detection method for wind tunnel sealing ring |
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