CN115182829B - Large-pressure-difference high-rotation-speed floating ring sealing test bed - Google Patents
Large-pressure-difference high-rotation-speed floating ring sealing test bed Download PDFInfo
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- CN115182829B CN115182829B CN202210835991.XA CN202210835991A CN115182829B CN 115182829 B CN115182829 B CN 115182829B CN 202210835991 A CN202210835991 A CN 202210835991A CN 115182829 B CN115182829 B CN 115182829B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- Combustion & Propulsion (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A large-pressure-difference high-rotation-speed floating ring sealing test bed relates to the field of aerospace. The invention solves the problems that the existing rocket turbine pump floating ring seal test bed directly pressurizes a high-pressure chamber by adopting a water supply pump, has limited pressurizing capacity, and cannot meet the high-pressure difference and high-rotation speed floating ring seal test. The center of the right end face of the rotor is axially provided with a hollow water supply hole with depth reaching the center of the wheel disc, the right end of the hollow water supply hole is communicated with a pressure-bearing water tank, the inside of the wheel disc is uniformly provided with a plurality of water throwing holes tangential to the hollow water supply hole along the circumferential direction, the outer edge face of the wheel disc is provided with a plurality of balance holes in one-to-one correspondence with the water throwing holes along the circumferential direction, two ends of each water throwing hole are respectively communicated with the corresponding hollow water supply hole and the balance hole, and the left water collecting cavity and the right water collecting cavity are circulated with working mediums of the pressure-bearing water tank through a water circulation system. The invention is used for providing a required test environment for floating ring test.
Description
Technical Field
The invention relates to the field of aerospace, mainly relates to sealing and dynamic response testing equipment of a turbopump of a liquid rocket engine, and particularly relates to a high-pressure-difference high-rotation-speed floating ring sealing test bed.
Background
In modern process installations in the aerospace industry sector, seals take a vital role due to the harsh operating conditions of mechanical equipment. The sealing technology not only directly influences the normal operation of the fluid machinery due to the good or bad product performance, but also is regarded as a comprehensive engineering category, has special significance for improving the integral sealing level of the machine, and is particularly important for the rotating machinery in the aerospace field.
The liquid rocket engine turbine is characterized in that oxidant and fuel are boosted by a turbine pump and then pushed into a combustion chamber, and clearance sealing is a key component for controlling leakage of the turbine pump, so that the working efficiency and the running stability of the liquid rocket engine are directly related. Under the severe environment of high rotation speed, large pressure difference and ultra-low temperature and ultra-high temperature in a turbopump of a liquid rocket engine, various contact sealing technologies such as brush sealing and flexible sheet sealing are difficult to meet the working requirements. Due to the existence of objective factors such as processing errors, dynamic bending, thermal deformation and the like, vibration of the rotor often causes rubbing of the surface of the rotor and the surface of the fixed clearance sealing wall, so that sealing failure is caused. Under the oxygen-enriched environment in the turbopump of the liquid oxygen liquid rocket engine, the rotor and the stator component are rubbed to easily cause oxygen-enriched combustion of metal, so that the reliability of the liquid rocket engine is reduced. The floating gap seal is a gap seal element capable of moving relative to the rotor, has the function of automatically centering relative to the rotor, and has a gap height which is far smaller than that of a fixed gap seal, so that the leakage of a working medium is remarkably reduced. And the clearance sealing fluid can provide certain rigidity and damping for the rotor system, so that the stability of the turbine pump rotor system can be improved.
The floating ring has a series of advantages of simple structure, reliable sealing, easy installation, adaptation to harsh environments and the like, and is widely applied to liquid rocket engines in the aerospace field in recent years. The floating clearance sealing technology with high sealing efficiency and high operation stability is an effective and most economical key technology for further improving the operation reliability of the liquid rocket engine. At present, a theoretical method and a simulation foundation of a system exist for floating gap sealing, but the leakage quantity of the floating gap sealing, the dynamic response of a floating ring structure and the operation stability technology under high rotation speed and large pressure difference are further researched in the aspect of test.
Chinese patent publication No. CN111636981a, publication No. 2020, 9 and 8, discloses a test bed for sealing a floating ring of a rocket turbine pump. According to the floating ring sealing test bench, through processing pore passages communicated with the channels of the floating ring on the front cavity and the rear cavity of the high-pressure cavity forming the floating ring to work, the water supply pump is adopted to directly pressurize the high-pressure cavity through the pore passages, the pressure value in the high-pressure cavity is directly determined by the pressurizing value of the water supply pump due to the pressurizing mode, the maximum pressure value which can be provided by the water supply pump is relatively small due to the limited pressurizing capacity of the water supply pump, and 1.5-2.5MPa sealing pressure difference can be provided for the floating ring test, so that the high-pressure difference and high-rotation-speed floating ring sealing test cannot be met.
Disclosure of Invention
The invention aims to solve the problems that the existing rocket turbine pump floating ring seal test bench directly pressurizes a high-pressure chamber by adopting a water supply pump, has limited pressurizing capacity and cannot meet the requirements of high-pressure-difference and high-rotation-speed floating ring seal tests, and further provides the high-pressure-difference and high-rotation-speed floating ring seal test bench.
The technical scheme of the invention is as follows:
the large-pressure-difference high-rotation-speed floating ring sealing test bench comprises a floating ring testing and pressurizing integrated device 4, a driving mechanism for providing power for the floating ring testing and pressurizing integrated device 4, a data acquisition and control system 5 for acquiring measurement parameters required by the floating ring testing, a pressure-bearing water tank 8, a water circulation system for providing test media for the floating ring testing, two supporting components 3 and a cooling and lubricating system 10 for cooling and lubricating the supporting components 3 and the driving mechanism; the floating ring testing and pressurizing integrated device 4 comprises a floating ring testing cavity, a left water collecting cavity 4-8, a right water collecting cavity 4-18, a rotor 4-19 and two floating ring test pieces 4-17, wherein the left side and the right side of the floating ring testing cavity are respectively connected with the left water collecting cavity 4-8 and the right water collecting cavity 4-18, the left end of the rotor 4-19 sequentially axially penetrates through the left half part and the left water collecting cavity 4-8 of the floating ring testing cavity and is fixedly connected with the output end of a driving mechanism, the right end of the rotor 4-19 sequentially axially penetrates through the right half part and the right water collecting cavity 4-18 of the floating ring testing cavity and is rotatably connected with the pressure-bearing water tank 8, a supporting component 3 for supporting the rotor 4-19 is respectively arranged between the left water collecting cavity 4-8 and the driving mechanism, a wheel disc is processed in the middle of the rotor 4-19, the rotor 4-19 on the two sides of the wheel disc is respectively processed with a moving ring contact surface, the moving ring contact surface on the two sides of the wheel disc is processed into a conical shape, the transition part between the moving ring contact surface and the outer edge of the wheel disc is fixedly connected with the output end of the driving mechanism, the floating ring contact surface of the moving ring testing cavity 4-17 is sleeved with the floating ring testing cavity, and the floating ring testing cavity is rotatably connected with the floating ring testing cavity 4-17; the center of the right end face of the rotor 4-19 is axially provided with a hollow water supply hole 4-19.1 with depth reaching the center of the wheel disc, the right end of the hollow water supply hole 4-19.1 is communicated with the pressure-bearing water tank 8, the inside of the wheel disc is uniformly provided with a plurality of water throwing holes 4-19.2 tangential to the hollow water supply hole 4-19.1 along the circumferential direction, the outer edge face of the wheel disc is provided with a plurality of balance holes in one-to-one correspondence with the water throwing holes 4-19.2 along the circumferential direction, two ends of each water throwing hole 4-19.2 are respectively communicated with the corresponding hollow water supply hole 4-19.1 and the balance holes, and the left water collecting cavity 4-8 and the right water collecting cavity 4-18 are in working medium circulation with the pressure-bearing water tank 8 through a water circulation system.
Further, the floating ring test cavity comprises a left high-pressure cavity 4-13, a spring sealing ring 4-14, a right high-pressure cavity 4-15, a test bed base 4-24 and a plurality of stud through bolts 4-16, wherein the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are oppositely arranged above the test bed base 4-24 side by side, the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are fixedly connected through the stud through bolts 4-16, the spring sealing ring 4-14 is adopted between the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 for sealing, and the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are respectively fixedly connected with the test bed base 4-24.
Further, the data acquisition and control system 5 comprises four first eddy current displacement sensors 4-12 for measuring the motion track of the floating ring test piece 4-17, the first eddy current displacement sensors 4-12 are pressure-resistant eddy current displacement sensors, two high-pressure cavity connecting threaded holes are formed in the outer arc surfaces of the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 in a circumferential direction of 90 degrees, the floating ring test cavity further comprises four thread sleeves 4-11 and four displacement sensor locking nuts, external cylindrical surfaces of the thread sleeves 4-11 are integrally machined into external threads, the thread sleeves 4-11 are spirally installed in the high-pressure cavity connecting threaded holes and are fixed on the floating ring test cavity through the displacement sensor locking nuts, the lower half parts of the variable-diameter through holes are machined into the displacement sensor connecting threaded holes and are provided with positioning openings, the upper half parts of the variable-diameter through holes are machined into through holes, the eddy current sensors are spirally installed in the high-pressure-resistant cavity connecting threaded holes, the eddy current sensors are installed in the pressure-resistant eddy current sensor connecting threaded holes, and extend to the pressure-resistant floating ring test piece through the pressure-resistant test piece, and the pressure-resistant eddy current sensor is connected to the pressure-resistant floating ring test piece through the pressure-resistant eddy current test piece, and the pressure-resistant eddy current sensor is installed in the pressure-resistant test piece, and the pressure-resistant eddy current test piece is connected to the pressure-resistant test piece.
Further, the water circulation system comprises a water supply pump 6, a water storage tank 7 and a water return pump 9, wherein a water inlet pipeline of the water supply pump 6 is connected with the water storage tank 7, a water outlet pipeline of the water supply pump 6 is connected with the pressure-bearing water tank 8, a water inlet pipeline of the water return pump 9 is respectively connected with the left water collecting cavity 4-8 and the right water collecting cavity 4-18 through three-way valves, a water outlet pipeline of the water return pump 9 is connected with the water storage tank 7, the water supply pump 6 pressurizes working medium in the water storage tank 7 through the water supply pump 6 and then conveys the working medium into the pressure-bearing water tank 8, the pressure-bearing water tank 8 is connected with the right end of a hollow water supply hole 4-19.1 of a rotor 4-19 in the floating ring test and pressurization integrated device 4, and the working medium is discharged into the water storage tank 7 through the water return pump 9 after the floating ring seal test.
Further, the floating ring testing and pressurizing integrated device 4 also comprises a water tank end packing seal 4-22 and two water collecting cavity end packing seals 4-7, wherein axial sealing is realized between the left water collecting cavity 4-8 and the rotor 4-19 and between the right water collecting cavity 4-18 and the rotor 4-19 through the water collecting cavity end packing seals 4-7 respectively, and axial sealing is realized between the pressure-bearing water tank 8 and the rotor 4-19 through the water tank end packing seals 4-22.
Further, the data acquisition and control system 5 further comprises four second eddy current displacement sensors 4-9 for measuring the movement track of the rotor 4-19, two displacement sensor mounting holes are formed in the outer arc surfaces of the left water collecting cavity 4-8 and the right water collecting cavity 4-18 in a circumferential direction of 90 degrees, the second eddy current displacement sensors 4-9 are mounted in the displacement sensor mounting holes and sealed through sealant, and probes of the second eddy current displacement sensors 4-9 are directed to the rotor 4-19.
Further, the data acquisition and control system 5 further includes a turbine flowmeter 4-23 for measuring the leakage amount of the floating ring, and the turbine flowmeter 4-23 is installed between the water supply pump 6 and the pressurized water tank 8.
Further, the data acquisition and control system 5 further comprises four pressure sensors 4-10, wherein two pressure sensors 4-10 are respectively arranged in the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15, one pressure sensor 4-10 is used for monitoring the fluid pressure at the top of the inner wheel of the left high-pressure cavity 4-13 or the right high-pressure cavity 4-15, and the other pressure sensor 4-10 is used for monitoring the fluid pressure at the installation position of the floating ring test piece 4-17 in the left high-pressure cavity 4-13 or the right high-pressure cavity 4-15.
Further, the data acquisition and control system 5 further comprises a rotation speed measuring instrument 4-25 for measuring the rotation speed of the rotor 4-19, wherein the rotation speed measuring instrument 4-25 is arranged at one end of the rotor 4-19 close to the driving mechanism.
Further, the supporting component 3 comprises a bearing seat, a bearing sealing cover 4-3, a bearing locking nut 4-4, a bearing sealing chamber 4-6, two bearing end covers 4-2 and two angular contact bearings 4-5, wherein a circular through hole is processed on the bearing seat, two oil guide ring grooves are processed on the inner wall of the circular through hole of the bearing seat along the circumferential direction, an oil outlet is processed on the left end face of the bearing seat of the oil guide ring groove along the axial direction, the oil outlet is respectively communicated with the two oil guide ring grooves through two oil ways, the bearing sealing chamber 4-6 is coaxially arranged in the circular through hole of the bearing seat, the bearing sealing chamber 4-6 is near one side end face of the left water collecting cavity 4-8 and is provided with a shaft hole which can be in rotary fit with the rotor 4-19, one side end part of the bearing sealing chamber 4-6 near the driving mechanism is provided with the bearing sealing cover 4-3, the bearing sealing cover 4-3 is processed on one side end part of the bearing sealing cover 4-3, the two angular contact bearings 4-5 which are arranged side by side are coaxially arranged in the bearing sealing chamber 4-6, the bearing 4-5 and the bearing sealing chamber 4-6 are integrally sleeved on the rotor 4-19, the bearing sealing chamber 4-19 is axially connected with the bearing end covers 4-19 through the axial bearing end covers 4-19, the other end faces of the two bearing end covers 4-19 are axially connected with the bearing end covers 4-19 through the axial bearing sealing end covers 4-8, the oil pipe joint 4-1 sequentially passes through the bearing end cover 4-2 and the bearing sealing cover 4-3 and is communicated with a bearing sealing cavity formed by the bearing sealing chamber 4-6 and the bearing sealing cover 4-3.
Compared with the prior art, the invention has the following effects:
the invention provides a large-pressure-difference high-rotation-speed floating ring sealing test bed for better clarifying the influence rule of the existing floating ring sealing structure parameters and the operation working conditions on the operation state of the floating ring of the large-pressure-difference high-rotation-speed turbine pump. The test bed is used for realizing the test of leakage quantity of floating ring sealing of the turbopump of the liquid rocket engine, dynamic response of a floating ring structure and operation stability. The water supply pump 6 pressurizes the working medium once and then injects the working medium into the pressure-bearing water tank 8, the working medium axially enters the hollow liquid supply holes 4-19.1 of the rotors 4-19 and fills the interiors of the rotors 4-19, and as the wheel disc rotates rapidly, the liquid throwing holes 4-19.2 in the wheel disc drive the working medium to flow to the outer edge of the wheel disc, so that the liquid throwing holes 4-19.2 do work on the working medium, at the moment, the kinetic energy and the pressure energy of the working medium are both increased, the working medium is secondarily pressurized by decelerating and pressurizing after passing through the shell of the floating ring test cavity, and the working pressure required by the sealing inlet of the floating ring 4-17 is reached. The floating ring sealing test bench can provide at least 6MPa sealing pressure difference and 18000rpm rotation speed for floating ring test, can provide accurate parameters and technical support for researching the leakage quantity of the floating ring of the turbine pump of the liquid rocket engine, dynamic response of the structure of the floating ring and operation stability, has various test capabilities, and provides technical support for gap sealing design of the floating ring of the turbine pump.
Drawings
FIG. 1 is a flow chart of the system components of a high differential pressure and high rotational speed floating ring seal test stand of the present invention;
FIG. 2 is a front cross-sectional view of a high differential pressure, high rotational speed floating ring seal test stand body of the present invention;
FIG. 3 is an axial cross-sectional view of a floating ring seal dynamic response test position in accordance with a third embodiment of the present invention;
FIG. 4 is a schematic view of the assembled structure of the pressurized water tank 8, floating ring test piece 4-17 and rotor 4-19 of the present invention;
FIG. 5 is a cross-sectional view of FIG. 4 at A-A;
FIG. 6 is a perspective view of a high differential pressure, high rotational speed floating ring seal test stand of the present invention.
In the figure:
1 is a driving motor; 2 is a gear box; 3 is a supporting component; 4 is a floating ring testing and pressurizing integrated device; 5 is a data acquisition and control system; 6 is a water supply pump; 7 is a water storage tank; 8 is a pressure-bearing water tank; 9 is a water return pump; 10 is a cooling and lubricating system;
4-1 is an oil pipe joint; 4-2 is a bearing end cover; 4-3 is a bearing sealing cover; 4-4 is a bearing lock nut; 4-5 are angular contact bearings; 4-6 are bearing closed chambers; 4-7 is a water collecting cavity end packing seal; 4-8 is left water collecting cavity; 4-9 are second eddy current displacement sensors; 4-10 are pressure sensors; 4-11 are thread sleeves; 4-12 are first eddy current displacement sensors; 4-13 are left high-pressure cavities; 4-14 are elastic sealing rings; 4-15 is right high pressure cavity; 4-16 are stud bolts; 4-17 are floating ring test pieces; 4-18 are right water collecting cavities; 4-19 are rotors; 4-20 are disc springs; 4-21 are labyrinth seals; 4-22 are water tank end packing seals; 4-23 turbine flowmeter; 4-24 are test bed bases; 4-25 is a rotation speed tester;
4-19.1 is a hollow water supply hole; 4-19.2 are water throwing holes.
Detailed Description
The first embodiment is as follows: referring to fig. 1 to 6, a large pressure difference, high rotation speed floating ring seal test stand according to the present embodiment is described, and includes a floating ring test and pressurization integrated device 4, a driving mechanism for powering the floating ring test and pressurization integrated device 4, a data acquisition and control system 5 for acquiring measurement parameters required for the floating ring test, a pressure-bearing water tank 8, a water circulation system for providing test media for the floating ring test, two support assemblies 3, and a cooling and lubrication system 10 for cooling and lubricating the support assemblies 3 and the driving mechanism; the floating ring testing and pressurizing integrated device 4 comprises a floating ring testing cavity, a left water collecting cavity 4-8, a right water collecting cavity 4-18, a rotor 4-19 and two floating ring test pieces 4-17, wherein the left side and the right side of the floating ring testing cavity are respectively connected with the left water collecting cavity 4-8 and the right water collecting cavity 4-18, the left end of the rotor 4-19 sequentially axially penetrates through the left half part and the left water collecting cavity 4-8 of the floating ring testing cavity and is fixedly connected with the output end of a driving mechanism, the right end of the rotor 4-19 sequentially axially penetrates through the right half part and the right water collecting cavity 4-18 of the floating ring testing cavity and is rotatably connected with the pressure-bearing water tank 8, a supporting component 3 for supporting the rotor 4-19 is respectively arranged between the left water collecting cavity 4-8 and the driving mechanism, a wheel disc is processed in the middle of the rotor 4-19, the rotor 4-19 on the two sides of the wheel disc is respectively processed with a moving ring contact surface, the moving ring contact surface on the two sides of the wheel disc is processed into a conical shape, the transition part between the moving ring contact surface and the outer edge of the wheel disc is fixedly connected with the output end of the driving mechanism, the floating ring contact surface of the moving ring testing cavity 4-17 is sleeved with the floating ring testing cavity, and the floating ring testing cavity is rotatably connected with the floating ring testing cavity 4-17; the center of the right end face of the rotor 4-19 is axially provided with a hollow water supply hole 4-19.1 with depth reaching the center of the wheel disc, the right end of the hollow water supply hole 4-19.1 is communicated with the pressure-bearing water tank 8, the inside of the wheel disc is uniformly provided with a plurality of water throwing holes 4-19.2 tangential to the hollow water supply hole 4-19.1 along the circumferential direction, the outer edge face of the wheel disc is provided with a plurality of balance holes in one-to-one correspondence with the water throwing holes 4-19.2 along the circumferential direction, two ends of each water throwing hole 4-19.2 are respectively communicated with the corresponding hollow water supply hole 4-19.1 and the balance holes, and the left water collecting cavity 4-8 and the right water collecting cavity 4-18 are in working medium circulation with the pressure-bearing water tank 8 through a water circulation system.
In the embodiment, the driving mechanism comprises a driving motor 1 and a gear box 2, an output shaft of the driving motor 1 is connected with the gear box 2, and an output shaft of the gear box 2 is connected with rotors 4-19 of the floating ring testing and supercharging integrated device through a diaphragm coupler to provide power for the test bed, and a frequency converter is used for controlling the rotating speed of the driving motor 1 so as to meet the test rotating speed requirement. The gear box 2, the rotor 4-19, the supporting component 3, the floating ring testing cavity, the left water collecting cavity 4-8, the right water collecting cavity 4-18 and the pressure-bearing water tank 8 are arranged on the same axis. The floating ring testing and pressurizing integrated device 4 has symmetrical integral structure, pressure in a floating ring testing cavity is balanced and stable, and the sealing inlet pressure and the rotating speed of the rotors 4-19 are controllable, so that the floating ring testing under various working conditions is met. The pressurized water tank 8 is strung into the axial water supply end of the rotors 4-19 at a distance such that the rotor ends are flush with the pressurized water tank 8. The number of the liquid throwing holes 4-19.2 and the balance holes on the wheel disc of the rotor 4-19 is 8.
The second embodiment is as follows: referring to fig. 2 and 6, a floating ring test cavity of the present embodiment includes a left high-pressure cavity 4-13, a spring seal ring 4-14, a right high-pressure cavity 4-15, a test stand base 4-24, and a plurality of stud bolts 4-16, where the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are disposed above the test stand base 4-24 side by side, the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are fixedly connected by the plurality of stud bolts 4-16, the spring seal ring 4-14 is used to seal between the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15, and the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are respectively fixedly connected with the test stand base 4-24. So set up, test bench base 4-24 and pressure-bearing water tank 8 are all fixed on basic platform through rag bolt. The left high-pressure cavity 4-13 and the right high-pressure cavity 4-15 are axially positioned by adopting two cylindrical pins, 16 studs 4-16 are uniformly distributed in the circumferential direction and connected, the left water collecting cavity 4-8 and the right water collecting cavity 4-18 are respectively connected with the left high-pressure cavity 4-13 and the right high-pressure cavity 4-15, and the connecting surfaces are sealed by adopting spring sealing rings. Other compositions and connection relationships are the same as those of the first embodiment.
And a third specific embodiment: in connection with fig. 2, fig. 3 and fig. 6, the data acquisition and control system 5 of this embodiment includes four first eddy current displacement sensors 4-12 for measuring the motion track of the floating ring test piece 4-17, four threaded sleeves 4-11 and four displacement sensor locking nuts, the first eddy current displacement sensors 4-12 are pressure-resistant eddy current displacement sensors, two high pressure cavity connection threaded holes are circumferentially formed in the outer arc surfaces of the left high pressure cavity 4-13 and the right high pressure cavity 4-15, the floating ring test cavity further includes four threaded sleeves 4-11 and four displacement sensor locking nuts, the whole external cylindrical surface of the threaded sleeves 4-11 is processed into external threads, the threaded sleeves 4-11 are spirally mounted in the high pressure cavity connection threaded holes and fixed on the floating ring test cavity through the displacement sensor locking nuts, the inner portions of the threaded sleeves 4-11 are processed into variable diameter through holes, the lower half portions of the variable diameter through holes are processed into the displacement sensor connection threaded holes and are provided with positioning ports, the half portions of the variable diameter through holes are processed into the eddy current sensor connection threaded holes, and the spiral sensor connection with the eddy current sensor locking nuts extend to the pressure-resistant test piece through the pressure-resistant cable, and the eddy current sensor connection test piece is mounted on the outer surface of the floating ring test piece, and the eddy current sensor connection test piece is mounted on the outer surface of the floating ring. The first eddy current displacement sensor 4-12 is used for monitoring the motion trail of the floating ring test piece 4-17, the working pressure in the floating ring test cavity is not lower than 6MPa, the floating ring test sensor with the withstand voltage specification not lower than 6MPa is required to be selected, and secondly, the conventional eddy current displacement sensor probe is difficult to meet the floating ring test installation requirement due to the fact that the strength and the sealing of the mounting position of the floating ring test sensor are required to be considered, and the test requirement of the floating ring is met by adopting a threaded sleeve tool. Other compositions and connection relationships are the same as those of the first or second embodiment.
In the embodiment, a gap of 0.9mm exists between an inner hole of the floating ring test piece 4-17 and an outer circle of the rotor 4-19, a gap of 0.2mm exists between the outer circle of the floating ring test piece 4-17 and the inner wall of the floating ring test cavity, when the floating ring test cavity is filled with high-pressure working medium, the motion track of the floating ring test piece 4-17 under the drive of the rotor 4-19 rotating at a high speed can be changed, and the motion track of the floating ring test piece 4-17 is measured through a pressure-resistant type eddy current displacement sensor.
The specific embodiment IV is as follows: the water circulation system of the present embodiment is described with reference to fig. 1, 2 and 6, and includes a water supply pump 6, a water storage tank 7 and a water return pump 9, wherein a water inlet pipeline of the water supply pump 6 is connected to the water storage tank 7, a water outlet pipeline of the water supply pump 6 is connected to a pressure-bearing water tank 8, a water inlet pipeline of the water return pump 9 is connected to the left water collecting cavity 4-8 and the right water collecting cavity 4-18 respectively through three-way valves, a water outlet pipeline of the water return pump 9 is connected to the water storage tank 7, a working medium in the water storage tank 7 is pressurized by the water supply pump 6 and then conveyed to the pressure-bearing water tank 8, the pressure-bearing water tank 8 is connected to the right end of a hollow water supply hole 4-19.1 of a rotor 4-19 in the floating ring test and pressurization integrated device 4, and the working medium is discharged into the water storage tank 7 by the water return pump 9 after the floating ring seal test, thereby realizing the working medium circulation. The working medium in the water storage tank 7 is pressurized and injected into the pressure-bearing water tank 8 through the water supply pump 6, axially reaches the position of the rotor wheel disc through the hollow liquid supply holes 4-19.1 of the rotor 4-19, is thrown to the outer edge of the wheel disc through the liquid throwing holes 4-19.2 in the rotary wheel disc and is discharged at a higher flow speed and pressure, is discharged after being decelerated and pressurized in the high-pressure cavity, and then is leaked into the left water collecting cavity 4-8 and the right water collecting cavity 4-18 through the symmetrically installed pair of floating ring test pieces 4-17, and is pumped back into the water storage tank 7 through the water return pump 9, so that the working medium circulation is realized. Other compositions and connection relationships are the same as those of the first, second or third embodiments.
Fifth embodiment: referring to fig. 2, the floating ring testing and pressurizing integrated device 4 of the present embodiment further includes a water tank end packing 4-22, two water collecting cavity end packing 4-7, and axial sealing is achieved between the left water collecting cavity 4-8 and the rotor 4-19 and between the right water collecting cavity 4-18 and the rotor 4-19 through the water collecting cavity end packing 4-7, and axial sealing is achieved between the pressure-bearing water tank 8 and the rotor 4-19 through the water tank end packing 4-22. The arrangement is that a water tank end packing seal 4-22 is arranged between the rotor and the high-pressure tank body of the pressure-bearing water tank 8, and a labyrinth seal 4-21 is arranged between the rotor and the peripheral tank body of the pressure-bearing water tank 8, so that the sealing connection between the rotor and the pressure-bearing water tank 8 is realized, and the problem of leakage of working medium is avoided. Other compositions and connection relationships are the same as those of the first, second, third or fourth embodiments.
Specific embodiment six: referring to fig. 2, the data acquisition and control system 5 of this embodiment further includes four second eddy current displacement sensors 4-9 for measuring the motion track of the rotor 4-19, two displacement sensor mounting holes are respectively formed on the outer arc surfaces of the left water collecting cavity 4-8 and the right water collecting cavity 4-18 in a circumferential direction of 90 °, the second eddy current displacement sensors 4-9 are mounted in the displacement sensor mounting holes and sealed by sealant, and the probes of the second eddy current displacement sensors 4-9 are directed to the rotor 4-19. The second eddy current displacement sensor 4-9 is used for monitoring the movement track of the rotor 4-19, the second eddy current displacement sensor 4-9 is a conventional eddy current displacement sensor, and the size of the probe can meet the test and installation requirements of the rotor. Other compositions and connection relationships are the same as those of the first, second, third, fourth or fifth embodiments.
Seventh embodiment: the data acquisition and control system 5 of the present embodiment further includes a turbine flowmeter 4-23 for measuring the leakage amount of the floating ring, the turbine flowmeter 4-23 being installed between the water supply pump 6 and the pressurized water tank 8, as described in connection with fig. 1. Other compositions and connection relationships are the same as those of the first, second, third, fourth, fifth or sixth embodiments.
Eighth embodiment: referring to fig. 2, the data acquisition and control system 5 of this embodiment further includes four pressure sensors 4-10, two pressure sensors 4-10 are respectively installed in the left high pressure cavity 4-13 and the right high pressure cavity 4-15, one pressure sensor 4-10 is used for monitoring the fluid pressure at the top of the inner disk of the left high pressure cavity 4-13 or the right high pressure cavity 4-15, and the other pressure sensor 4-10 is used for monitoring the fluid pressure at the installation position of the floating ring test piece 4-17 in the left high pressure cavity 4-13 or the right high pressure cavity 4-15. Other compositions and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth or seventh embodiments.
Detailed description nine: referring to fig. 1, the data acquisition and control system 5 of the present embodiment further includes a rotational speed measuring device 4-25 for measuring the rotational speed of the rotor 4-19, where the rotational speed measuring device 4-25 is mounted at one end of the rotor 4-19 near the driving mechanism. Other compositions and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth, seventh or eighth embodiments.
Detailed description ten: referring to fig. 1, the supporting component 3 of the present embodiment includes a bearing housing, a bearing sealing cover 4-3, a bearing locking nut 4-4, a bearing sealing chamber 4-6, two bearing end caps 4-2 and two angular contact bearings 4-5, a circular through hole is machined on the bearing housing, two oil guiding ring grooves are machined on the inner wall of the circular through hole of the bearing housing along the circumferential direction, an oil outlet is machined on the left end face of the bearing housing of the oil guiding ring groove along the axial direction, the oil outlet is communicated with the two oil guiding ring grooves through two oil passages, the bearing sealing chamber 4-6 is coaxially installed in the circular through hole of the bearing housing, a shaft hole which can be rotatably matched with the rotor 4-19 is machined on the end face of one side of the bearing sealing chamber 4-6 close to the left water collecting cavity 4-8, the end part of one side of the bearing closed chamber 4-6, which is close to the driving mechanism, is provided with a bearing closed cover 4-3, the bearing closed cover 4-3 is provided with an oil pipe assembly hole, two side by side angular contact bearings 4-5 are coaxially arranged in the bearing closed chamber 4-6, the angular contact bearings 4-5 and the bearing closed chamber 4-6 are integrally sleeved on a rotor 4-19, the axial positioning of a coaxial shaft shoulder at one end of the angular contact bearings 4-5 is realized, the axial positioning of the other end of the angular contact bearings 4-5 is realized through a bearing locking nut 4-4, two bearing end covers 4-2 positioned at two sides of a bearing seat are sleeved on the rotor 4-19, the bearing end covers 4-2 are connected with the bearing seat through connecting screws, the oil pipe joint 4-1 sequentially passes through the bearing end cover 4-2 and the bearing sealing cover 4-3 and is communicated with a bearing sealing cavity formed by the bearing sealing chamber 4-6 and the bearing sealing cover 4-3. The rotor 4-19 is supported by two pairs of angular contact bearings 4-5 which are arranged back to back, the bearings are cooled and lubricated by the cooling and lubricating system 10 communicated with the oil outlet and the oil pipe joint 4-1, the cooling and lubricating system 10 is equipment for providing cooling and lubrication for the gear box 2 and the supporting component 3, the lubricating and cooling system 10 conveys lubricating oil to the lubricated equipment through an oil pump and an oil pipe, and the lubricating oil is recycled. Other compositions and connection relationships are the same as those of the one, two, three, four, five, six, seven, eight or nine embodiments.
In the embodiment, a pair of angle contact bearings 4-5 are installed in a bearing closed chamber 4-6, then are sleeved on a bearing positioning surface of a rotor 4-19 and are axially pressed by a lock nut 4-4, a bearing closed cover 4-3 is sleeved on a test bed base 4-24, a disc spring 4-20 is axially installed on the water tank side of the rotor to provide axial force for a rotor system, a bearing end cover 4-2 is fixed on the test bed base 4-24 through an inner hexagon bolt, and an oil pipe joint 4-1 is connected.
In the embodiment, a disc spring 4-20 is arranged between a right bearing end cover 4-2 of a bearing assembly 3 close to one side of a pressure-bearing water tank 8 and a bearing closed chamber 4-6, the disc spring 4-20 is axially arranged on the water tank side of a rotor 4-19 to provide axial force for a rotor system, and an oil inlet hole is further processed on a bearing seat close to one side of the pressure-bearing water tank 8 for replacing an oil pipe joint on the side because the installation position of the disc spring 4-20 interferes with the oil pipe joint 4-1; thermocouples are installed in the bearing closed chambers 4-6 for monitoring the bearing temperature.
Principle of operation
Referring to fig. 1 to 6, a floating ring seal test is performed by using the high pressure difference and high rotation speed floating ring seal test bench according to the present invention, and the specific operation steps are as follows:
step one, assembling a test bed:
sleeving a pair of floating ring test pieces 4-17 with the same structure on the rotors 4-19, sequentially assembling the test tables into a whole, installing sensors required by a floating ring sealing test, and connecting the sensors with a cooling and lubricating system 10 and a water circulation system; step two, preparation before test:
checking whether the connecting pieces of the foundation bolts, the shaft couplings and the test bed are loosened, opening the data acquisition and control system 5, and starting the oil pump to cool and lubricate the gear box 2 and the supporting component 3;
step three, filling:
the water supply pump 6 is set to be started in advance with a lower pressure value, when water in the water return pipes passing through the high-pressure cavity, the left water collecting cavity 4-8 and the right water collecting cavity 4-18 is discharged, the water return pump 9 is started, waterway circulation is completed, and whether leakage exists in the test bed is checked;
step four, test stage:
the integrated device 4 for adjusting the frequency converter of the water supply pump 6 to control the floating ring test and the pressurization adjusts the rotating speed of the rotor frequency converter to control the rotor 4-19, so that the pressure and the rotating speed required by the floating ring test are achieved, and after the rotating speed and the pressure are stable for 30 seconds, test data of each measuring point are collected and recorded in real time;
step five, ending the test:
after the test is finished, the driving motor 1 is firstly turned off, the water supply pump 6 is turned off, the water return pump 9 is turned off, the lubricating and cooling system is turned off after the rotation speed of the rotors 4-19 is stopped, and the measurement of the floating ring test pieces is finished.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The high-pressure-difference high-rotation-speed floating ring sealing test bench comprises a floating ring testing and pressurizing integrated device (4), a driving mechanism for providing power for the floating ring testing and pressurizing integrated device (4), a data acquisition and control system (5) for acquiring measurement parameters required by the floating ring testing, a pressure-bearing water tank (8), a water circulation system for providing test media for the floating ring testing, two supporting components (3) and a cooling and lubricating system (10) for cooling and lubricating the supporting components (3) and the driving mechanism; the method is characterized in that: the floating ring testing and pressurizing integrated device (4) comprises a floating ring testing cavity, a left water collecting cavity (4-8), a right water collecting cavity (4-18), a rotor (4-19) and two floating ring test pieces (4-17), wherein the left side and the right side of the floating ring testing cavity are respectively connected with the left water collecting cavity (4-8) and the right water collecting cavity (4-18), the left end of the rotor (4-19) sequentially axially passes through the left half part of the floating ring testing cavity and the left water collecting cavity (4-8) and is fixedly connected with the output end of a driving mechanism, the right end of the rotor (4-19) sequentially axially passes through the right half part of the floating ring testing cavity and the right water collecting cavity (4-18) and is rotatably connected with a pressure-bearing water tank (8), a supporting component (3) for supporting the rotor (4-19) is respectively arranged between the left water collecting cavity (4-8) and the driving mechanism, the middle part of the rotor (4-19) is provided with a wheel disc, the two sides of the rotor disc (4-19) are respectively provided with a conical surface, the two outer edge of the rotor disc (4-19) are respectively processed on the two sides of the floating ring testing cavity and the two sides are respectively in contact with the floating ring testing cavity, the floating ring testing cavity is in a conical surface and the floating ring testing cavity is in contact with the two sides of the floating ring testing cavity (4-17), the wall surface of the sealed cavity of the floating ring test cavity is used for the end wall of the stator contacted with the boss of the floating ring; the center of the right end face of the rotor (4-19) is axially provided with a hollow water supply hole (4-19.1) with a depth reaching the center of the wheel disc, the right end of the hollow water supply hole (4-19.1) is communicated with the pressure-bearing water tank (8), the inside of the wheel disc is uniformly provided with a plurality of water throwing holes (4-19.2) tangential to the hollow water supply hole (4-19.1) along the circumferential direction, the outer edge face of the wheel disc is provided with a plurality of balance holes corresponding to the water throwing holes (4-19.2) one by one along the circumferential direction, two ends of each water throwing hole (4-19.2) are respectively communicated with the corresponding hollow water supply hole (4-19.1) and the balance hole, and the left water collecting cavity (4-8) and the right water collecting cavity (4-18) are circulated with a working medium of the pressure-bearing water tank (8) through a water circulation system.
2. The high differential pressure and high rotational speed floating ring seal test stand according to claim 1, wherein: the floating ring test cavity comprises a left high-pressure cavity (4-13), a spring sealing ring (4-14), a right high-pressure cavity (4-15), a test bed base (4-24) and a plurality of double-head through bolts (4-16), wherein the left high-pressure cavity (4-13) and the right high-pressure cavity (4-15) are oppositely arranged above the test bed base (4-24) side by side, the left high-pressure cavity (4-13) and the right high-pressure cavity (4-15) are fixedly connected through the double-head through bolts (4-16), the spring sealing ring (4-14) is adopted between the left high-pressure cavity (4-13) and the right high-pressure cavity (4-15), and the left high-pressure cavity (4-13) and the right high-pressure cavity (4-15) are fixedly connected with the test bed base (4-24) respectively.
3. The high differential pressure and high rotational speed floating ring seal test stand according to claim 2, wherein: the data acquisition and control system (5) comprises four first eddy current displacement sensors (4-12), four thread sleeves (4-11) and four displacement sensor locking nuts, wherein the first eddy current displacement sensors (4-12) are pressure-resistant eddy current displacement sensors, two high-pressure cavity connecting threaded holes are circumferentially formed in the outer arc surfaces of the left high-pressure cavity (4-13) and the right high-pressure cavity (4-15) at 90 degrees, the floating ring test cavity further comprises four thread sleeves (4-11) and four displacement sensor locking nuts, the whole external cylindrical surface of each thread sleeve (4-11) is processed into an external thread, each thread sleeve (4-11) is spirally installed in the corresponding high-pressure cavity connecting threaded hole and fixed on the floating ring test cavity through the corresponding displacement sensor locking nut, the inner part of each thread sleeve (4-11) is processed into a diameter-changing through hole, the lower half part of each diameter changing through hole is processed into the corresponding displacement sensor connecting threaded hole and is provided with a locating port, the corresponding eddy current sensor is installed on the corresponding threaded hole, and the outer part of each thread changing through the corresponding eddy current sensor is connected with the corresponding pressure-resistant sensor through hole, and the corresponding eddy current sensor is installed on the floating ring test cavity, and the eddy current sensor is connected to the pressure-resistant sensor through the corresponding displacement sensor through the corresponding pressure-resistant sensor through hole (4-17).
4. A high differential pressure, high rotational speed floating ring seal test stand as defined in claim 3 wherein: the water circulation system comprises a water supply pump (6), a water storage tank (7) and a water return pump (9), wherein a water inlet pipeline of the water supply pump (6) is connected with the water storage tank (7), a water outlet pipeline of the water supply pump (6) is connected with a pressure-bearing water tank (8), a water inlet pipeline of the water return pump (9) is respectively connected with a left water collecting cavity (4-8) and a right water collecting cavity (4-18) through a three-way valve, a water outlet pipeline of the water return pump (9) is connected with the water storage tank (7), working medium in the water storage tank (7) is conveyed into the pressure-bearing water tank (8) after being pressurized by the water supply pump (6), the pressure-bearing water tank (8) is connected with the right end of a hollow water supply hole (4-19.1) of a rotor (4-19) in the floating ring test and pressurization integrated device (4), and the working medium is discharged into the water storage tank (7) through the water return pump (9) after being subjected to a floating ring seal test.
5. The high differential pressure and high rotational speed floating ring seal test stand according to claim 4, wherein: the floating ring testing and pressurizing integrated device (4) further comprises a water tank end packing seal (4-22), two water collecting cavity end packing seals (4-7), axial sealing is achieved between the left water collecting cavity (4-8) and the rotor (4-19) and between the right water collecting cavity (4-18) and the rotor (4-19) through the water collecting cavity end packing seal (4-7), and axial sealing is achieved between the pressure-bearing water tank (8) and the rotor (4-19) through the water tank end packing seals (4-22).
6. The high differential pressure and high rotational speed floating ring seal test stand according to claim 5, wherein: the data acquisition and control system (5) further comprises four second eddy current displacement sensors (4-9) for measuring the movement track of the rotor (4-19), two displacement sensor mounting holes are formed in the outer arc surfaces of the left water collecting cavity (4-8) and the right water collecting cavity (4-18) in a circumferential direction of 90 degrees, the second eddy current displacement sensors (4-9) are mounted in the displacement sensor mounting holes and sealed through sealant, and probes of the second eddy current displacement sensors (4-9) are directed to the rotor (4-19).
7. The high differential pressure and high rotational speed floating ring seal test stand according to claim 6, wherein: the data acquisition and control system (5) further comprises a turbine flowmeter (4-23) for measuring the leakage quantity of the floating ring, and the turbine flowmeter (4-23) is arranged between the water supply pump (6) and the pressure-bearing water tank (8).
8. The high differential pressure and high rotational speed floating ring seal test stand of claim 7, wherein: the data acquisition and control system (5) further comprises four pressure sensors (4-10), two pressure sensors (4-10) are respectively arranged in the left high-pressure cavity (4-13) and the right high-pressure cavity (4-15), one pressure sensor (4-10) is used for monitoring the fluid pressure at the top of the inner disc of the left high-pressure cavity (4-13) or the right high-pressure cavity (4-15), and the other pressure sensor (4-10) is used for monitoring the fluid pressure at the installation position of the floating ring test piece (4-17) in the left high-pressure cavity (4-13) or the right high-pressure cavity (4-15).
9. The high differential pressure and high rotational speed floating ring seal test stand of claim 8, wherein: the data acquisition and control system (5) further comprises a rotating speed measuring instrument (4-25) for measuring the rotating speed of the rotor (4-19), and the rotating speed measuring instrument (4-25) is arranged at one end, close to the driving mechanism, of the rotor (4-19).
10. The high differential pressure, high rotational speed floating ring seal test stand of claim 1, 2, 3, 5, 7, 8 or 9, wherein: the bearing assembly (3) comprises a bearing seat, a bearing sealing cover (4-3), a bearing locking nut (4-4), a bearing sealing chamber (4-6), two bearing end covers (4-2) and two angular contact bearings (4-5), wherein a circular through hole is formed in the bearing seat, two oil guide ring grooves are formed in the inner wall of the circular through hole of the bearing seat along the circumferential direction, an oil outlet is formed in the left end face of the oil guide ring groove bearing seat along the axial direction, the oil outlet is communicated with the two oil guide ring grooves through two oil passages, the bearing sealing chamber (4-6) is coaxially arranged in the circular through hole of the bearing seat, a shaft hole which can be in rotary fit with the rotor (4-19) is formed in the end face of one side, close to the left water collecting cavity (4-8), the bearing sealing cover (4-3) is arranged at one end, an oil pipe assembling hole is formed in the bearing sealing cover (4-3) is formed in one side, two angular contact bearings (4-5) which are arranged side by side are coaxially arranged in the bearing sealing chamber (4-6), the angular contact bearings (4-5) and the angular contact bearings (4-6) are coaxially arranged at one end of the shaft sealing cover (4-19), the other end of the angular contact bearing (4-5) is axially positioned through a bearing lock nut (4-4), two bearing end covers (4-2) positioned on two sides of the bearing seat are sleeved on the rotor (4-19), the bearing end covers (4-2) are connected with the bearing seat through connecting screws, and an oil pipe joint (4-1) sequentially penetrates through the bearing end covers (4-2) and the bearing sealing cover (4-3) and is communicated with a bearing sealing cavity formed by the bearing sealing chamber (4-6) and the bearing sealing cover (4-3).
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| CN202210835991.XA CN115182829B (en) | 2022-07-15 | 2022-07-15 | Large-pressure-difference high-rotation-speed floating ring sealing test bed |
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| CN202210835991.XA CN115182829B (en) | 2022-07-15 | 2022-07-15 | Large-pressure-difference high-rotation-speed floating ring sealing test bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2589955B1 (en) * | 1985-11-08 | 1989-12-08 | Sealol | TURBOPUMP SEALING DEVICE |
| DE102006040130A1 (en) * | 2006-08-26 | 2008-02-28 | Ksb Aktiengesellschaft | Delivery pump for delivery and dosing of fluid materials e.g. chemical, pharmaceutical or cosmetic components, has variable-speed drive and is configured as single-stage centrifugal pump having radial wheel |
| CN111753380A (en) * | 2020-06-12 | 2020-10-09 | 哈尔滨工业大学 | Modeling method for gap sealing model of rocket engine liquid oxygen turbine pump |
| CN111636981A (en) * | 2020-06-12 | 2020-09-08 | 哈尔滨工业大学 | Test bench for testing floating ring seal of rocket turbopump |
| CN213775555U (en) * | 2020-09-27 | 2021-07-23 | 蓝箭航天技术有限公司 | Low-temperature high-rotating-speed floating ring sealing test device for rocket engine turbine pump |
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