CN111947855A - Low-temperature dynamic seal test bed and test method - Google Patents
Low-temperature dynamic seal test bed and test method Download PDFInfo
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- CN111947855A CN111947855A CN202010874393.4A CN202010874393A CN111947855A CN 111947855 A CN111947855 A CN 111947855A CN 202010874393 A CN202010874393 A CN 202010874393A CN 111947855 A CN111947855 A CN 111947855A
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- 238000012360 testing method Methods 0.000 title claims abstract description 84
- 238000010998 test method Methods 0.000 title abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 238000003860 storage Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 79
- 238000007667 floating Methods 0.000 claims description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 230000003068 static effect Effects 0.000 claims description 16
- 230000001050 lubricating effect Effects 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 8
- 239000002826 coolant Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005461 lubrication Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 210000004907 gland Anatomy 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 6
- 230000005514 two-phase flow Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 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
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Abstract
The invention discloses a low-temperature dynamic seal test bed and a test method, which belong to the field of mechanical seal and comprise a medium pressurizing unit, a medium storage unit, a medium supply adjusting unit, a tester, a power system, a transmission system and a measurement and control system, wherein an output pipeline of the medium pressurizing unit is connected with the medium storage unit, an output pipeline of the medium storage unit is connected with a medium inlet of the tester through the medium supply adjusting unit, the transmission system provides power for the tester, and a circuit with the measurement and control system is respectively connected to the medium pressurizing unit, the medium storage unit, the medium supply adjusting unit, the tester, the power system and the transmission system. The low-temperature dynamic seal test bed solves the problem of insufficient test capability of the existing test bed, and overcomes the influence of the derived axial force of a dynamic seal piece in a high-pressure state on a process bearing; by improving the flow detection method of the gas-liquid two-phase flow, the leakage of the dynamic seal is accurately measured, and accurate data basis is provided for the development and improvement of the dynamic seal.
Description
Technical Field
The invention belongs to the field of mechanical sealing, and particularly relates to a low-temperature dynamic sealing test bed and a test method.
Background
The mechanical sealing elements are divided into dynamic sealing and static sealing according to the using state, the dynamic sealing is divided into reciprocating dynamic sealing and rotary dynamic sealing, and the rotary sealing has the highest technical difficulty. The rotary dynamic seal comprises: the contact type dynamic seal, end face seal for short, of the moving part and the static part which are in direct contact; the non-contact dynamic seal, called floating ring seal for short, is not in direct contact with the floating ring seal; the two seals are mainly used for high-speed rotating machinery, in particular to a turbine pump of an aerospace engine and various high-speed pumps.
The dynamic seal is an essential element used for rotary machinery, the performance of the dynamic seal is directly related to the working state of the whole rotary equipment, when the seal fails, the whole device can be damaged, serious accidents can be caused, particularly in the fields of aerospace, chemical industry and the like, the dynamic seal is an important element on a pump, and the catastrophic accident statistics of domestic and foreign rockets is about 1/3 caused by seal failure; dynamic seal failure accounts for a higher proportion of catastrophic accidents in the chemical industry. In the design of the dynamic sealing structure, various parameters such as sealing pressure ratio, materials, friction coefficient, temperature, medium characteristics, rotating speed, leakage amount and the like, except the geometric dimension detection of a finished product, the detection is verified through a bench running test, and particularly, on an aerospace engine, each dynamic sealing element can be installed on the engine after being detected on a test bench to be qualified. The test bench test detection is to install the dynamic sealing element on the test bench, provide certain rotating speed, load and lubricating conditions, operate for certain time, simulate actual working conditions, detect the real state of the seal in the operation process, and obtain the core indexes of the performance, the service life and the like of the dynamic seal. The dynamic seal test bed is important detection equipment in the dynamic seal development and verification process.
At present, various related sealing test beds and detection methods are available at home and abroad, mainly the normal-temperature test state is more, and the low-temperature medium dynamic sealing test bed is less because of high design difficulty, high technical content and high construction cost. The low-temperature dynamic seal test bed constructed by some domestic aerospace units mainly has the advantages that the test pressure is low and is not more than 6 MPa; for a test with higher pressure, the structural design of the tester is unreasonable, and the bearing cannot bear larger axial force generated by sealing under high pressure of a medium; especially, the leakage rate of the dynamic seal with liquid nitrogen as a working medium is detected, the leakage medium is in a gas-liquid two-phase flow state, the leakage amount cannot be accurately measured, accurate test data cannot be provided for the improved design of the dynamic seal, and the dynamic seal can be gradually verified by a plurality of touch tests, so that the development period is delayed, and a large amount of economic loss is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-temperature dynamic seal test bed and a test method.
The invention relates to a low-temperature dynamic seal test bed which comprises a medium pressurizing unit, a medium storage unit, a medium supply adjusting unit, a tester, a power system, a transmission system and a measurement and control system, wherein an output pipeline of the medium pressurizing unit is connected with the medium storage unit, an output pipeline of the medium storage unit is connected with a medium inlet of the tester through the medium supply adjusting unit, the transmission system provides power for the tester, and a circuit with the measurement and control system is respectively connected to the medium pressurizing unit, the medium storage unit, the medium supply adjusting unit, the tester, the power system and the transmission system.
As a further improvement of the invention, the tester is formed by respectively and symmetrically sealing a front shell and a rear shell at two ends of a middle shell, annular extending parts are respectively arranged on the outer side surfaces of the front shell and the rear shell to form a cavity in the middle, and a front end cover and a rear end cover are respectively fixed with the corresponding extending parts to seal the cavity; an annular clamping table protruding inwards is arranged in the middle of the middle shell, the reducing main shaft axially penetrates through the rear end cover, the rear shell and the front shell, a bearing cavity sealing piece is arranged on the contact surface of the inner sides of the rear shell and the front shell and the reducing main shaft, a bearing is arranged on the contact surface of the outer side of the rear shell and the front shell, and a rear end cover sealing piece is arranged on the contact surface of the rear end cover and the reducing main shaft; the front sealing element assembly and the rear sealing element assembly respectively press the corresponding floating rings and are fixed with the two sides of the annular clamping table; a sealing medium main inlet which radially penetrates through the annular clamping table is formed in the middle shell and is communicated to the tester, and a front bearing medium outlet and a rear bearing medium outlet are respectively formed in the extending parts of the front shell and the rear shell; a front bearing medium inlet and a rear bearing medium inlet which are fixed on the outer walls of the front shell and the rear shell are connected through a hole channel between the bearing cavity sealing element and the bearing of the front shell and the rear shell; and the middle shell on two sides of the annular clamping table is respectively provided with a front sealing leakage port and a rear sealing leakage port.
As a further improvement of the invention, two output pipelines of the medium pressurizing unit are respectively connected with inlets of a high-pressure medium container A and a low-pressure medium container B of the medium storage unit through a pressure reducer a and a pressure reducer B, an outlet pipeline of the high-pressure medium container A is connected to a sealing medium main inlet of the tester through a medium supply adjusting unit, and a front sealing leakage port and a rear sealing leakage port are connected to the gasifier; the low-pressure medium pipeline is respectively connected to a front bearing medium inlet and a rear bearing medium inlet of the tester through a medium supply adjusting unit, and the bearing cooling medium is discharged from a front bearing medium outlet and a rear bearing medium outlet.
As a further improvement of the invention, the annular shaft sleeve is pressed and fixed by a pressing cap on the outer side of the annular shaft sleeve on the reducing main shaft.
As a further improvement of the invention, the outer wall of the front end cover is provided with a temperature measuring nozzle communicated with the inner cavity.
As a further improvement of the invention, the tester is characterized in that a main shaft penetrates through the axis of a shell, a front bearing is sleeved at the reducing position of the front end of the main shaft and is embedded in an annular clamping table at the front end of the shell, a bearing pressing sleeve and a movable ring are sequentially sleeved on the main shaft at the front end of the front bearing, and the movable ring pressing sleeve presses the movable ring and is fastened with the main shaft through threads; the static ring component is fixed with the inner wall of the shell, and a sealing ring at the bottom of the static ring component is abutted against the ring surface of the dynamic ring; the rear end reducing part of the main shaft is sleeved with a rear bearing and is tightly pressed by a gland, the front end of the shell is sealed by a front end cover II, the outer wall of the front end cover II is provided with a sealing leakage port communicated with the inner cavity, the rear end of the shell is connected and sealed by a rear end cover II, one side wall of the front end of the shell is provided with a medium inlet, the other opposite side wall of the front end of the shell is provided with a medium pressure measuring nozzle which is communicated with the inner cavity of the shell, and the side wall of the rear end of the shell is provided with a medium outlet communicated with the.
As a further improvement of the invention, the output pipeline of the medium pressurizing unit is connected with the inlet of a high-pressure medium container A of the medium storage unit through a pressure reducer a, the outlet pipeline of the high-pressure medium container A is connected to the medium inlet of the tester through a medium supply adjusting unit, and the sealing leakage port pipeline is connected to the gasifier.
As a further improvement of the invention, a gasket is arranged on the contact surface of the static ring assembly and the inner wall of the shell.
The low-temperature dynamic seal test bed can realize a dynamic seal test and an end face seal test of the floating ring, solves the problem of insufficient test capability of the low-temperature seal test bed, and is embodied in that: the tester suitable for sealing elements with different structures is reasonably designed, the influence of the derived axial force of the dynamic sealing element in a high-pressure state on a process bearing is overcome, and the tester can detect the dynamic sealing element in an environment of 15Mpa to the maximum extent; by improving the flow detection method of the gas-liquid two-phase flow, the leakage of the dynamic seal is accurately measured, accurate data basis is provided for the development and the improvement of the dynamic seal, and the development time and the development cost are also saved.
Drawings
FIG. 1 is a flow chart of the system components of the present invention;
FIG. 2 is a schematic diagram of the floating ring seal tester of the present invention;
fig. 3 is a schematic structural view of an end face seal tester of the present invention.
Detailed Description
Example 1
The invention discloses a low-temperature dynamic seal test bed which is suitable for a floating ring seal test and comprises a medium pressurizing unit 1, a medium storage unit 2, a medium supply adjusting unit 3, a tester 8, a transmission system 6, a cooling and lubricating system 7 and a measurement and control system 5 as shown in figures 1 and 2. The tester is a device for installing a tested sealing element; an output shaft of the transmission system 6 is connected with a main shaft of the tester by a coupler to provide power for the rotation of the main shaft of the tester, and the requirement of test rotating speed is met by a transmission mode that a high-speed variable frequency motor or a common variable frequency motor drags a speed increasing box; meanwhile, the lubricating system 7 is equipment for providing cooling lubrication for a high-speed motor or a speed increasing box of the transmission system, the lubricating system conveys lubricating oil to a lubricated device through an oil pump and an oil inlet and return pipeline, and the lubricating oil is recycled; the medium supply system is used for supplying a test medium for the seal in the tester and supplying a cooling and lubricating medium for the bearing of the tester; the measurement control system collects and controls the measurement parameter data of each subsystem, and is composed of a sensor, a data collector, a computer and measurement and control software thereof. The medium container is used for storing working medium, an exhaust valve and a safety valve are installed on the container, the medium container stores liquid nitrogen, gas is filled into the container through the medium pressurizing unit 1 to extrude the medium out, and the medium pressurizing unit 1 comprises a valve for pressurizing the gas, a pressure reducer, a safety valve, a pipeline, a pressure sensor and the like; the medium supply adjusting unit 3 comprises a medium pipeline, a valve, a flowmeter, a pressure sensor, a temperature sensor and the like.
The tester 8 of the test bed is fixed on a fixed base and is formed by respectively symmetrically installing and sealing a front shell 203 and a rear shell 204 at two ends of a middle shell 202, annular extending parts are respectively arranged on the outer side surfaces of the front shell 203 and the rear shell 204 to form a cavity in the middle, and a front end cover 211 and a rear end cover 213 are respectively fixed with the corresponding extending parts to seal the cavity; an annular clamping table 222 which protrudes inwards is arranged in the middle of the middle shell 202, the reducing spindle 201 axially penetrates through the rear end cover 213, the rear shell 204 and the front shell 203, a bearing cavity sealing element 210 is arranged on the contact surface of the inner sides of the rear shell 204 and the front shell 203 and the reducing spindle 201, a bearing 209 is arranged on the contact surface of the outer side, and a rear end cover sealing element 214 is arranged on the contact surface of the rear end cover 213 and the reducing spindle 201; a floating ring shaft sleeve 207 is sleeved on a symmetrical diameter expanding section of the reducing main shaft 201 in the middle shell 202, a pressing cap 208 presses the floating ring shaft sleeve 207 to fix the floating ring shaft sleeve, a group of floating rings 223 are respectively installed on the floating ring shaft sleeve 207, and the front sealing element assembly 205 and the rear sealing element assembly 206 respectively press the corresponding floating rings 223 and are fixed with two sides of the annular clamping table 222; a sealing medium main inlet 215 radially penetrating through an annular clamping table 222 is formed in the middle shell 202 and communicated with the tester 8, and a front bearing medium outlet 220 and a rear bearing medium outlet 221 are respectively formed in the extending parts of the front shell 203 and the rear shell 204 and communicated with the cavity; a duct 224 is arranged between the bearing cavity sealing piece 210 and the bearing 209 of the front shell 203 and the rear shell 204 and is connected with a front bearing medium inlet 218 and a rear bearing medium inlet 219 which are fixed on the outer walls of the duct; a front seal leak port 216 and a rear seal leak port 217 are provided on the middle housing 202 on either side of the annular shelf 222. The outer wall of the front end cover 211 is provided with a temperature measuring nozzle 212 communicated with the inner cavity.
Specifically, two output pipelines of the medium pressurizing unit 1 are respectively connected with inlets of a high-pressure medium container A and a low-pressure medium container B of the medium storage unit 2 through a pressure reducer a and a pressure reducer B, the medium containers are composed of two parts, the high-pressure medium container is used for supplying floating ring sealing test medium, and the low-pressure medium container is used for supplying process bearing cooling medium; the outlet pipeline of the high-pressure medium container A is connected to a sealing medium main inlet 215 of the tester 8 through the medium supply regulating unit 3, the low-pressure medium pipeline is respectively connected to a front bearing medium inlet 218 and a rear bearing medium inlet 219 of the tester 8 through the medium supply regulating unit 3, and a front sealing leakage port 216 and a rear sealing leakage port 217 are connected to the gasifier through pipelines. The tester has a sealing medium inlet and a medium outlet corresponding to the number of floating rings.
According to the floating ring seal tester, through the structural design that two groups of floating rings are installed face to face, a high-pressure medium is fed between the two seals, and the axial force generated by the two seals is balanced, so that a bearing of the tester is free from additional axial force, and the bearing problem is solved. The gasifier installed through the sealed leakage port effectively gasifies the gas-liquid two-phase flow, and the accurate measurement is carried out through the flowmeter.
As shown in fig. 2, the floating ring seal tester of the low-temperature dynamic seal test bed of the invention comprises a main shaft 201, a bearing 209 and a floating ring shaft sleeve 207 which form a shaft system; the front seal assembly 205 and the rear seal assembly 206 are symmetrically arranged on the middle shell 202, test media are filled between the front seal assembly and the middle shell, and axial forces generated by the pressure of the media on the seal ring are mutually counteracted; a cooling medium front bearing medium inlet 218 and a cooling medium rear bearing medium inlet 219, and a cooling bearing rear front bearing medium outlet 220 and a cooling bearing rear bearing medium outlet 221 are arranged on the tester shell 8; the tester is provided with a sealing medium main inlet 215, a front sealing leakage port 216 and a rear sealing leakage port 217; the floating ring assembly is fixed on the tester shell by bolts, and the floating ring sealing shaft sleeve is fixed on the main shaft by a pressing cap 208. The medium flow path is as follows: the inlet medium of the floating ring seal enters through a sealing medium main inlet 215 and then reaches a leakage cavity through a symmetrical group of floating rings, the leakage medium is generally gas-liquid two-phase, the leakage medium enters into the gasifier through a front seal leakage port 216 and a rear seal leakage port 217, liquid nitrogen is completely heated to be in a gas state, and then the leakage amount is measured through a flowmeter. The pressure and temperature indexes are measured in all cavities of the tester.
The low-temperature dynamic seal test bed provided by the invention is used for performing a floating ring seal test, and the operation steps are as follows:
(1) installing a tester: installing a floating ring shaft sleeve on a main shaft; mounting the floating ring assembly on a tester, assembling three parts of the tester into a whole, and mounting a medium nozzle and a pressure and temperature measuring nozzle;
(2) preparation before the test: mounting a tester on a test bench, adjusting the coaxiality of the main shaft and an output shaft of the transmission system, and connecting the main shaft and the output shaft by using a coupling; connecting the medium inlet and outlet pipelines; connecting a pipeline of the lubricating system to an oil point for a motor or a speed increasing box of a transmission system; connecting the temperature and pressure equal measuring point sensors with wiring;
(3) and (3) system blowing and medium filling stages: blowing clean containers, pipeline systems and valve systems in the medium supply system by using dry compressed air or nitrogen;
(4) filling stage: filling the high-pressure container for the sealing test and the low-pressure container for the bearing cooling medium with media;
(5) pre-cooling stage of the tester: starting a pressurizing and air distributing unit to pressurize a medium container, regulating the flow of the medium through a valve on a medium supply pipeline, and precooling the tester; precooling the tester by using a low-temperature medium in a high-pressure container, and precooling a bearing of the tester by using a low-temperature medium in a low-pressure container; adjusting an adjusting valve on a medium supply pipeline to achieve the flow and pressure required by the test;
(6) and (3) an operation stage: starting a lubricating system of a transmission system, then starting a motor of the transmission system to reach the rotating speed required by a test, collecting test parameters by a measurement control system, heating and gasifying leaked gas-liquid two-phase liquid nitrogen by a gasifier, and measuring the leakage amount by a flowmeter;
(7) and (3) at the end stage of the test: stopping the motor to stop the tester; stopping the lubrication system and the medium supply system; and after the tester returns to the normal temperature, the tester is decomposed, and the condition after the sealed operation is detected.
Example 2
The invention relates to a low-temperature dynamic seal test bed which is suitable for end face seal experiments and comprises a medium pressurizing unit 1, a medium storage unit 2, a medium supply adjusting unit 3, a tester 8, a transmission system 6, a cooling and lubricating system 7 and a measurement and control system 5, wherein an output pipeline of the medium pressurizing unit 1 is connected with the medium storage unit 2, an output pipeline of the medium storage unit 2 is connected with a medium inlet of the tester 8 through the medium supply adjusting unit 3, the transmission system 6 provides power for the tester 8, and a circuit of the measurement and control system 5 is respectively connected to the medium pressurizing unit 1, the medium storage unit 2, the medium supply adjusting unit 3, the tester 8 and the transmission system 6. The functional use of each unit is the same as in example 1.
The tester 8 is characterized in that a main shaft 302 penetrates through the axis position of a shell 301, as shown in fig. 3, a front bearing 303 is sleeved at the reducing position of the front end of the main shaft 302 and is embedded in a clamping table at the front end of the shell 301, a bearing pressing sleeve 304 and a movable ring 305 are sequentially sleeved on the main shaft at the front end of the front bearing 303, and the movable ring pressing sleeve 307 presses the movable ring 305 and is fastened with the main shaft 302 in a threaded manner; the static ring component 306 is fixed with the inner wall of the shell 301, and the sealing ring 318 at the bottom of the static ring component is abutted against the upper end face of the dynamic ring 305; the rear bearing 310 is sleeved at the diameter reducing part of the rear end of the main shaft 302 and is pressed by a gland, the front end of the shell 301 is sealed by a front end cover II 308, a sealing leakage hole 315 communicated with an inner cavity is formed in the outer wall of the front end cover II 308, the rear end of the shell 301 is connected and sealed by a rear end cover II 313, and the main shaft 302 penetrates through the rear end cover II 313, is sealed by a main shaft sealing element 312 and is pressed by the gland 311. A medium inlet 314 is arranged on one side wall of the front end of the shell 301, a medium pressure measuring nozzle 316 is arranged on the other side wall opposite to the medium inlet and communicated with the inner cavity of the shell, and a medium outlet 317 communicated with the inner cavity is arranged on the side wall of the rear end of the shell 301.
In the device, an output pipeline of a medium pressurizing unit 1 is connected with an inlet of a high-pressure medium container A of a medium storage unit 2 through a pressure reducer a, an outlet pipeline of the high-pressure medium container A is connected to a medium inlet 314 of a tester 8 through a medium supply adjusting unit 3, and a sealing leakage port 315 is connected to a gasifier through a pipeline. The medium entering of the end face seal tester only needs to enter and exit the medium by using one path of the high-pressure medium, and the low-pressure medium container does not participate in the work.
The invention relates to an end face seal tester of a low-temperature dynamic seal test bed, which comprises a main shaft 302, a front bearing 303, a rear bearing 3010 and a dynamic ring 305, wherein the main shaft is connected with the front bearing 303; the end face sealing static ring assembly 306 is arranged on the tester shell 301, and the compression amount of the static ring is adjusted through an adjusting gasket 309; measuring the pressure and temperature of the test media through the media pressure nozzle 316; the leakage of the test medium after the end face sealing is discharged through the sealing leakage port 315, the leakage amount is measured by the flowmeter, when the leakage medium is a gas-liquid two-phase flow, the leakage medium is changed into a gas phase by the gasifier, and then the leakage amount is accurately measured by the flowmeter. The tester has a media inlet and outlet, and a leak detection measurement port. The gasifier installed through the sealed leakage port effectively gasifies the gas-liquid two-phase flow, and the accurate measurement is carried out through the flowmeter.
The low-temperature dynamic seal test bed is used for carrying out an end face seal test, and the operation steps are as follows:
(1) installing a tester: installing the end face sealing movable ring on the main shaft, installing the static ring assembly on the tester shell, and adjusting the compression amount of the static ring by adjusting the thickness of the gasket;
(2) preparation before the test: mounting a tester on a test bench, adjusting the coaxiality of the main shaft and an output shaft of the transmission system, and connecting the main shaft and the output shaft by using a coupling; connecting the medium inlet and outlet pipelines; connecting a pipeline of the lubricating system to an oil point for a motor or a speed increasing box of a transmission system; connecting the temperature and pressure equal measuring point sensors with wiring;
(3) and (3) system blowing and medium filling stages: blowing clean containers, pipeline systems and valve systems in the medium supply system by using dry compressed air or nitrogen;
(4) filling stage: filling the vessel with a medium;
(5) pre-cooling stage of the tester: starting a pressurizing and air distributing unit to pressurize a medium container, regulating the flow of the medium through a valve on a medium supply pipeline, and precooling the tester; precooling the tester by using a low-temperature medium, and adjusting an adjusting valve on a medium supply pipeline after the temperature of the test medium is reached to reach the flow and pressure required by the test;
(6) and (3) an operation stage: starting a lubricating system of a transmission system, then starting a motor of the transmission system to reach the rotating speed required by a test, collecting test parameters by a measurement control system, heating and gasifying leaked gas-liquid two-phase liquid nitrogen by a gasifier, and measuring the leakage amount by a flowmeter;
(7) and (3) at the end stage of the test: stopping the motor to stop the tester; stopping the lubrication system and the medium supply system; and after the tester returns to the normal temperature, the tester is decomposed, and the condition after the sealed operation is detected.
Claims (10)
1. The utility model provides a low temperature dynamic seal test bench, by medium pressure boost unit (1), medium storage unit (2), medium supply adjusting unit (3), tester (8) and observing and controlling system (5) constitution, the output pipeline of its characterized in that medium pressure boost unit (1) connects medium storage unit (2), the output pipeline of medium storage unit (2) is connected with the medium entry of tester (8) through medium supply adjusting unit (3), transmission system (6) provide power for tester (8), the circuit that has observing and controlling system (5) couples to medium pressure boost unit (1) respectively, medium storage unit (2), medium supply adjusting unit (3), tester (8) and transmission system (6).
2. The low-temperature dynamic seal test bed as claimed in claim 1, wherein the tester (8) is formed by symmetrically closing a front shell (203) and a rear shell (204) at two ends of a middle shell (202), respectively, annular extension parts are arranged on the outer side surfaces of the front shell (203) and the rear shell (204) to form a cavity therebetween, and a front end cover (211) and a rear end cover (213) are respectively fixed with the corresponding extension parts to seal the cavity; an annular clamping table (222) protruding inwards is arranged in the middle of the middle shell (202), the reducing spindle (201) axially penetrates through the rear end cover (213), the rear shell (204) and the front shell (203), a bearing cavity sealing piece (210) is arranged on the contact surface of the inner sides of the rear shell (204) and the front shell (203) and the reducing spindle (201), a bearing (209) is arranged on the contact surface of the outer sides, and a rear end cover sealing piece (214) is arranged on the contact surface of the rear end cover (213) and the reducing spindle (201); a floating ring shaft sleeve (207) is sleeved on a symmetrical diameter expansion section of a reducing main shaft (201) in the middle shell (202), and a front sealing element assembly (205) and a rear sealing element assembly (206) respectively press corresponding floating rings (223) and are fixed with two sides of an annular clamping table (222); a sealing medium main inlet (215) which radially penetrates through the annular clamping table (222) is formed in the middle shell (202) and communicated with the tester (8), and a front bearing medium outlet (220) and a rear bearing medium outlet (221) which are communicated with the cavity are respectively formed in the extending parts of the front shell (203) and the rear shell (204); a duct (224) is arranged between the bearing cavity sealing piece (210) and the bearing (209) of the front shell (203) and the rear shell (204) to connect a front bearing medium inlet (218) and a rear bearing medium inlet (219) which are fixed on the outer walls of the duct; the middle shell (202) at two sides of the annular clamping table (222) is respectively provided with a front sealing leakage port (216) and a rear sealing leakage port (217).
3. The low-temperature dynamic sealing test bed as claimed in claim 2, wherein two output pipelines of the medium pressurizing unit (1) are respectively connected with inlets of a high-pressure medium container A and a low-pressure medium container B of the medium storage unit (2) through a pressure reducer a and a pressure reducer B, an outlet pipeline of the high-pressure medium container A is connected to a sealing medium main inlet (215) of the tester (8) through the medium supply adjusting unit (3), a front sealing leakage port (216) and a rear sealing leakage port (217) are respectively connected to the gasifier, and a low-pressure medium pipeline is respectively connected to a front bearing medium inlet (218) and a rear bearing medium inlet (219) of the tester (8) through the medium supply adjusting unit (3).
4. The cryogenic dynamic seal test bed as claimed in claim 2, wherein the floating ring shaft sleeve (207) is pressed and fixed by a pressing cap (208) on the outer side of the floating ring shaft sleeve on the reducing main shaft (201).
5. The low-temperature dynamic seal test bed as claimed in claim 2, wherein the outer wall of the front end cover (211) is provided with a temperature measuring nozzle (212) communicated with the inner cavity.
6. The low-temperature dynamic seal test bed according to claim 1, wherein the tester (8) penetrates through the main shaft (302) at the axis of the shell (301), the front bearing (303) is sleeved at the reducing position of the front end of the main shaft (302) and is embedded in the clamping table of the front end of the shell (301), the main shaft at the front end of the front bearing (303) is sequentially sleeved with the bearing pressing sleeve (304) and the moving ring (305), and the moving ring pressing sleeve (307) presses the moving ring (305) and is fastened with the main shaft (302) in a threaded manner; the static ring component (306) is fixed with the inner wall of the shell (301), and a sealing ring (318) at the bottom of the static ring component is abutted against the upper end face of the dynamic ring (305); the rear bearing (310) is sleeved at the diameter reducing position of the rear end of the main shaft (302) and is pressed by the gland, the front end of the shell (301) is sealed by the front end cover II (308), the outer wall of the front end cover II (308) is provided with a sealing leakage port (315) communicated with the inner cavity, the rear end of the shell (301) is connected and sealed by the rear end cover II (313), one side wall of the front end of the shell (301) is provided with a medium inlet (314), the other opposite side wall of the front end of the shell is provided with a medium pressure measuring nozzle (316), the medium pressure measuring nozzle and the inner cavity are communicated, and the medium outlet (317) communicated with the inner cavity is arranged on the side wall of the rear end.
7. A low-temperature dynamic sealing test bench as claimed in claim 6, characterized in that the output pipeline of the medium pressurizing unit (1) is connected with the inlet of the high-pressure medium container A of the medium storage unit (2) through a pressure reducer a, the outlet pipeline of the high-pressure medium container A is connected with the medium inlet (314) of the tester (8) through the medium supply adjusting unit (3), and the sealing leakage port (315) is connected with the gasifier through a pipeline.
8. A cryogenic dynamic seal test stand according to claim 6 characterised in that the static ring assembly (306) is provided with a gasket (309) on the contact surface with the inner wall of the housing (301).
9. The low-temperature dynamic seal test bed of claim 2 is used for performing a floating ring seal test, and the operation steps are as follows:
(1) installing a tester: installing a floating ring shaft sleeve on a main shaft; mounting the floating ring assembly on a tester, assembling three parts of the tester into a whole, and mounting a medium nozzle and a pressure and temperature measuring nozzle;
(2) preparation before the test: mounting a tester on a test bench, adjusting the coaxiality of the main shaft and an output shaft of the transmission system, and connecting the main shaft and the output shaft by using a coupling; connecting the medium inlet and outlet pipelines; connecting a pipeline of the lubricating system to an oil point for a motor or a speed increasing box of a transmission system; connecting the temperature and pressure equal measuring point sensors with wiring;
(3) and (3) system blowing and medium filling stages: blowing clean containers, pipeline systems and valve systems in the medium supply system by using dry compressed air or nitrogen;
(4) filling stage: filling the high-pressure container for the sealing test and the low-pressure container for the bearing cooling medium with media;
(5) pre-cooling stage of the tester: starting a pressurizing and air distributing unit to pressurize a medium container, regulating the flow of the medium through a valve on a medium supply pipeline, and precooling the tester; precooling the tester by using a low-temperature medium in a high-pressure container, and precooling a bearing of the tester by using a low-temperature medium in a low-pressure container; adjusting an adjusting valve on a medium supply pipeline to achieve the flow and pressure required by the test;
(6) and (3) an operation stage: starting a lubricating system of a transmission system, then starting a motor of the transmission system to reach the rotating speed required by a test, collecting test parameters by a measurement control system, heating and gasifying leaked gas-liquid two-phase liquid nitrogen by a gasifier, and measuring the leakage amount by a flowmeter;
(7) and (3) at the end stage of the test: stopping the motor to stop the tester; stopping the lubrication system and the medium supply system; and after the tester returns to the normal temperature, the tester is decomposed, and the condition after the sealed operation is detected.
10. The low-temperature dynamic seal test bed of claim 6 is used for carrying out end face seal tests, and the operation steps are as follows:
(1) installing a tester: installing the end face sealing movable ring on the main shaft, installing the static ring assembly on the tester shell, and adjusting the compression amount of the static ring by adjusting the thickness of the gasket;
(2) preparation before the test: mounting a tester on a test bench, adjusting the coaxiality of the main shaft and an output shaft of the transmission system, and connecting the main shaft and the output shaft by using a coupling; connecting the medium inlet and outlet pipelines; connecting a pipeline of the lubricating system to an oil point for a motor or a speed increasing box of a transmission system; connecting the temperature and pressure equal measuring point sensors with wiring;
(3) and (3) system blowing and medium filling stages: blowing clean containers, pipeline systems and valve systems in the medium supply system by using dry compressed air or nitrogen;
(4) filling stage: filling the vessel with a medium;
(5) pre-cooling stage of the tester: starting a pressurizing and air distributing unit to pressurize a medium container, regulating the flow of the medium through a valve on a medium supply pipeline, and precooling the tester; precooling the tester by using a low-temperature medium, and adjusting an adjusting valve on a medium supply pipeline after the temperature of the test medium is reached to reach the flow and pressure required by the test;
(6) and (3) an operation stage: starting a lubricating system of a transmission system, then starting a motor of the transmission system to reach the rotating speed required by a test, collecting test parameters by a measurement control system, heating and gasifying leaked gas-liquid two-phase liquid nitrogen by a gasifier, and measuring the leakage amount by a flowmeter;
(7) and (3) at the end stage of the test: stopping the motor to stop the tester; stopping the lubrication system and the medium supply system; and after the tester returns to the normal temperature, the tester is decomposed, and the condition after the sealed operation is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874393.4A CN111947855B (en) | 2020-08-27 | Low-temperature dynamic seal test bed and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874393.4A CN111947855B (en) | 2020-08-27 | Low-temperature dynamic seal test bed and test method |
Publications (2)
| Publication Number | Publication Date |
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| CN111947855A true CN111947855A (en) | 2020-11-17 |
| CN111947855B CN111947855B (en) | 2024-10-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798200A (en) * | 2021-02-01 | 2021-05-14 | 北京航空航天大学 | Micro-leakage graphite sealing leakage measuring method and device |
| CN112924094A (en) * | 2021-01-25 | 2021-06-08 | 清华大学 | Dynamic seal experimental equipment |
| CN114061852A (en) * | 2021-10-13 | 2022-02-18 | 合肥通用机械研究院有限公司 | Double-floating seal test device for simulating muddy water working condition |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924094A (en) * | 2021-01-25 | 2021-06-08 | 清华大学 | Dynamic seal experimental equipment |
| CN112798200A (en) * | 2021-02-01 | 2021-05-14 | 北京航空航天大学 | Micro-leakage graphite sealing leakage measuring method and device |
| CN114061852A (en) * | 2021-10-13 | 2022-02-18 | 合肥通用机械研究院有限公司 | Double-floating seal test device for simulating muddy water working condition |
| CN114061852B (en) * | 2021-10-13 | 2024-04-09 | 合肥通用机械研究院有限公司 | Double-floating seal test device for simulating muddy water working condition |
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