System for testing oil leakage resistance of turbocharger

Abstract

A system for testing oil leakage resistance of a turbocharger relates to the technical field of testing systems and comprises a pseudo turbine, a pseudo bearing body, a pseudo compressor and a rotating shaft. The simulated turbine comprises a simulated volute connected to one end of a simulated bearing body, a first oil collecting cover wrapping a volute end sealing ring is arranged between the simulated volute and the simulated bearing body, and a first oil outlet is formed in the bottom of the first oil collecting cover. The quasi-compressor comprises a second oil collecting cover connected to the other end of the quasi-bearing body, the second oil collecting cover wraps the pressing end sealing ring, a second oil outlet is formed in the bottom of the second oil collecting cover, and the second oil collecting cover is connected with a visible window corresponding to an outlet of the pressing end sealing ring. The problems that in the prior art, a testing device cannot conduct related measurement on the oil leakage amount of the pressure end and the vortex end in unit time, the form of engine oil overflowing from an outlet of a sealing ring of the pressure end cannot be observed, and comprehensive cognition on the negative pressure oil leakage characteristic of the gas compressor is not facilitated are solved.

Description

Technical Field

[0001] The invention relates to the technical field of testing systems, in particular to a turbocharger oil leakage resistance testing system. Background Art

[0002] A turbocharger consists of three major parts: a turbine, a compressor, and a bearing body. The bearing body connects the compressor and the turbine, and contains the bearing system components of the turbocharger. However, as the turbocharger ages, it will pose certain safety hazards to the reliable operation of the engine system. The lubricating oil in the bearing system can easily leak into the compressor flow channel. If oil leakage occurs at the compressor sealing ring, the leaked lubricating oil will enter the engine cylinder along with the fresh air and participate in combustion, which is particularly prominent in consuming engine oil. In view of the above reasons, the turbocharger's anti-oil leakage ability has become a key test item in its reliability development, and research and development to improve its anti-oil leakage ability is also an important aspect of turbocharger reliability research and development.

[0003] The prior art discloses a patent with a publication number of CN117168699A. The solution includes a test bench and a turbocharger, wherein the turbocharger includes a compressor and a turbine. The upper side of the test bench is provided with a fixing frame for clamping the turbocharger; a vacuum pump is provided on the test bench, and a negative pressure pipe is connected to the vacuum pump, and a No. 1 connecting pipe that can be connected to the exhaust port of the compressor is provided at the end of the negative pressure pipe. The negative pressure pipe includes a section of transparent pipe, which can generate negative pressure in the compressor of the turbocharger. The staff can intuitively know whether the turbocharger has oil leakage under the negative pressure value by observing whether there is oil in the transparent pipe.

[0004] As the existing technologies including the above-mentioned devices are used, their shortcomings are gradually exposed, which are mainly manifested in the following aspects: First, the main method used to determine whether the compressor is leaking oil is observation, and no relevant measurement is performed on the amount of oil leakage per unit time. Therefore, it cannot provide quantitative evaluation and guidance for the improvement of the anti-leakage structure.

[0005] Second, the existing device determines whether there is an oil leak by observing whether there are oil stains in the transparent pipe set at the compressor shell outlet. It cannot observe the shape of the oil overflowing from the compressor end sealing ring outlet, which is not conducive to a comprehensive understanding of the negative pressure oil leakage characteristics of the compressor.

[0006] Second, due to the high-temperature combustion environment, existing equipment is unable to test whether there is oil leakage at the turbine end, which reduces the comprehensive understanding of the negative pressure oil leakage characteristics of the turbocharger.

[0007] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0008] In response to the defects in the existing technology, the present invention solves the problem that the testing device in the traditional technology is unable to perform relevant measurements on the oil leakage volume per unit time at the compression end and the turbine end, and is unable to observe the form of the oil overflowing from the outlet of the compression end sealing ring, which is not conducive to a comprehensive understanding of the negative pressure oil leakage characteristics of the compressor.

[0009] In order to solve the above problems, the present invention provides the following technical solutions: A turbocharger oil leakage resistance test system includes a pseudo-turbine, a pseudo-bearing body, a pseudo-compressor, and a rotating shaft; The pseudo-turbine includes a pseudo-volute connected to one end of the pseudo-bearing body, an oil collecting cover covering a vortex end sealing ring is provided between the pseudo-volute and the pseudo-bearing body, and an oil outlet is provided at the bottom of the oil collecting cover; The pseudo-compressor includes an oil collecting cover 2 connected to the other end of the pseudo-bearing body, the oil collecting cover 2 covers the compression end sealing ring, the bottom of the oil collecting cover 2 is provided with an oil outlet 2, and the oil collecting cover 2 is connected to a visual window corresponding to the compression end sealing ring outlet.

[0010] As an optimized solution, the pseudo-compressor includes a tachometer wheel connected to the rotating shaft, the tachometer wheel is located in the second oil collecting cover, and the second oil collecting cover is connected to a speed sensor that matches the tachometer wheel.

[0011] As an optimized solution, the pseudo-compressor includes a displacement sensor connected to the two ends of the oil collecting cover, and a measuring gap is provided between the detection end of the displacement sensor and the end of the rotating shaft.

[0012] As an optimized solution, the pseudo-turbine includes a pseudo-turbine connected to the rotating shaft, and the pseudo-turbine can be installed on the rotating shaft in both forward and reverse directions.

[0013] As an optimized solution, the oil outlet 1 and the oil outlet 2 are respectively connected to a measuring cup.

[0014] As an optimized solution, the oil collecting hood includes an oil collecting hood wall, one end of the oil collecting hood wall is connected to the pseudo-bearing body, and the other end of the oil collecting hood wall is fixedly connected to a transparent baffle near the outlet of the vortex end sealing ring, and a hole is opened on the transparent baffle, and an oil collecting hood sealing ring matching the rotating shaft is provided in the hole.

[0015] As an optimized solution, the pseudo-volute includes a volute wall 1 and a volute wall 2 which are sequentially arranged from the outside to the inside, and a pseudo-volute flow channel is provided between the volute wall 1 and the volute wall 2. The volute wall 1 is provided with a number of tangential through holes connected to the pseudo-volute flow channel around the pseudo-turbine, and the pseudo-volute flow channel is connected to the main air supply system.

[0016] As an optimized solution, the pseudo-bearing body includes a pseudo-bearing shell, which is provided with an oil inlet and an oil return port connected to the inner cavity, and an oil supply system connected to the oil inlet and oil return port is provided outside the pseudo-bearing shell.

[0017] As an optimized solution, an air filling port communicating with the inner cavity is provided on the pseudo-bearing shell, and a secondary air supply system connected to the air filling port is provided on the outside of the pseudo-bearing shell.

[0018] As an optimized solution, the pseudo-bearing shell is provided with a plurality of sensor holes communicating with the inner cavity, the sensor holes are connected with temperature sensors or pressure measuring tubes, and the temperature sensors and pressure measuring tubes are connected with a test system.

[0019] Compared with the prior art, the present invention has the following beneficial effects: Through the design of the pseudo-turbine and pseudo-impeller, under the premise of maintaining the rotor dynamic characteristics consistent with the actual turbocharger, the pseudo-turbine and pseudo-impeller can make the wheel diameter smaller and the back-disk gap larger compared to the original turbine and original impeller, leaving space for observing the compression end sealing ring outlet and the turbine end sealing ring outlet. In addition, with the transparent baffle on the oil collecting cover one and the visual window on the oil collecting cover two, direct observation of whether there is lubricating oil overflow from the compression end sealing ring outlet and the turbine sealing ring outlet is achieved during the experiment. This not only solves the disadvantage that the traditional turbocharger negative pressure oil leakage experiment cannot observe the turbine end oil leakage, but also overcomes the disadvantage that the traditional experiment cannot observe the flow characteristics after the lubricating oil overflows. The present invention also has the advantages of simple structure and easy implementation. Only through the oil outlet 1 and the measuring cup below the oil outlet 2, the quantitative measurement of the oil leakage resistance of the turbocharger shaft structure can be achieved, overcoming the disadvantage that the traditional experiment can only judge whether there is oil leakage or not. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic structural diagram of embodiment 1 of the present invention; Figure 2 This is a schematic structural diagram of the pseudo-turbine of the present invention; Figure 3 It is a structural schematic diagram of the pseudo-volute of the present invention; Figure 4 This is a structural schematic diagram of the oil collecting cover 1 of the present invention; Figure 5Schematic diagram of the structure of the pseudo-impeller of the present invention; Figure 6 Schematic diagram of the structure of the speed measuring wheel of the present invention; Figure 7 This is a structural schematic diagram of the oil collecting cover 2 of the present invention; Figure 8 This is a schematic structural diagram of a pseudo-bearing shell according to the present invention; Figure 9 Schematic diagram of the structure of the test system of the present invention; Figure 10 It is a schematic diagram of the structure of the exterior of the present invention; Figure 11 This is a structural diagram of embodiment 2 of the present invention; Figure 12 Flow chart of the testing method of the present invention.

[0022] In the figure: 1 pseudo-turbine, 2 pseudo-bearing body, 201 pseudo-bearing body turbine end stop, 202 charging port, 3 pseudo-compressor, 4 rotating shaft, 5 pseudo-turbine, 501 turbine disk, 502 pseudo-turbine blade, 503 turbine shaft center hole, 504 pseudo-turbine blade tip clearance, 505 pseudo-turbine blade inlet, 506 pseudo-turbine extension section, 507 pseudo-turbine sealing ring groove, 6 pseudo-volute, 601 volute wall 1, 602 volute wall 2, 603 volute wall 1 flange, 604 volute wall 2 flange, 605 volute wall 2 stop, 606 pseudo-volute inlet, 607 replacement volute wall 1, 7 Turbine end sealing ring, 701 Turbine end sealing ring outlet, 8 Turbine locking nut, 9 Oil collecting cover 1, 901 Oil collecting cover wall, 902 Transparent baffle, 903 Oil outlet 1, 904 Oil collecting cover sealing ring, 10 Pseudo-impeller, 11 Speed measuring wheel, 1101 Speed measuring blade, 12 Locking nut, 13 Oil collecting cover 2, 1301 Oil collecting cover 2 stopper, 1302 Oil collecting cover 2 window, 1303 Oil collecting cover 2 transparent window, 1304 Oil outlet 2, 1305 Speed measuring hole, 1306 Displacement measuring hole, 14 Pressure end sealing ring, 1401 Pressure end sealing ring outlet, 15 Tangential passage hole, 16 support sleeve, 17 elastic sealing ring, 18 pseudo-volute flow channel, 1801 pseudo-volute annular cavity, 1802 intake flow channel, 19 speed sensor, 20 displacement sensor, 21 pseudo-bearing shell, 23 oil flow channel, 24 oil inlet, 25 oil return port, 26 floating bearing, 27 thrust bearing, 28 thrust sleeve, 29 impeller seat, 30 pressure end seal assembly, 3001 shaft seal, 3002 oil baffle, 31 vortex end seal assembly, 32 vortex end stop end face, 33 pressure end stop end face, 34 sensor hole, 35 temperature sensor, 36 pressure measuring tube, 3 7 Oil supply system, 3701 Oil tank, 3702 Oil pump, 3703 Oil filter, 3704 Heater, 3705 Oil inlet line, 3706 Oil return line, 3707 Oil flow meter, 38 Main air supply system, 3801 Main regulating valve, 3802 Main flow meter, 3803 Air compressor, 3804 Main air line, 39 Secondary air supply system, 3901 Secondary air regulating valve, 3902 Secondary air flow meter, 3903 Secondary air line, 3904 Secondary air compressor, 40 Testing system, 41 Bolts, 42 Measuring cup. DETAILED DESCRIPTION

[0023] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0024] Example 1: like Figures 1 to 10 As shown, the turbocharger anti-oil leakage ability testing system includes a pseudo-turbine 1, a pseudo-bearing body 2, a pseudo-compressor 3 and a rotating shaft 4; The pseudo-turbine 1 includes a pseudo-volute 6 connected to one end of the pseudo-bearing body 2. An oil collecting cover 9 covering a vortex end sealing ring 7 is provided between the pseudo-volute 6 and the pseudo-bearing body 2. An oil outlet 903 is provided at the bottom of the oil collecting cover 9. The pseudo-compressor 3 includes an oil collecting cover 13 connected to the other end of the pseudo-bearing body 2. The oil collecting cover 13 covers the compression end sealing ring 14. The bottom of the oil collecting cover 13 is provided with an oil outlet 1304. The oil collecting cover 13 is connected to a visual window corresponding to the compression end sealing ring outlet 1401.

[0025] The pseudo-compressor 3 includes a tachometer wheel 11 connected to the rotating shaft 4. The tachometer wheel 11 is located in the second oil collecting cover 13. The second oil collecting cover 13 is connected to a speed sensor 19 that matches the tachometer wheel 11.

[0026] The pseudo-compressor 3 includes a displacement sensor 20 connected to the end of the oil collecting cover 13 . A measuring gap is provided between the detection end of the displacement sensor 20 and the end of the rotating shaft 4 .

[0027] The pseudo-turbine 1 includes a pseudo-turbine 5 connected to a rotating shaft 4 . The pseudo-turbine 5 can be installed on the rotating shaft 4 in a forward and reverse manner.

[0028] The oil outlet 1 903 and the oil outlet 2 1304 are respectively connected to a measuring cup 42 .

[0029] The oil collecting hood 9 includes an oil collecting hood wall 901, one end of which is connected to the pseudo-bearing body 2, and the other end of the oil collecting hood wall 901 is fixedly connected to a transparent baffle 902 close to the turbine end sealing ring outlet 701. A hole is opened on the transparent baffle 902, and an oil collecting hood sealing ring 904 matching the rotating shaft 4 is provided in the hole.

[0030] The pseudo-volute 6 includes a volute wall 1 601 and a volute wall 2 602 which are sequentially arranged from the outside to the inside. A pseudo-volute flow channel 18 is provided between the volute wall 1 601 and the volute wall 2 602. The volute wall 1 601 is provided with a number of tangential through holes 15 around the pseudo-turbine 5 which are connected to the pseudo-volute flow channel 18. The pseudo-volute flow channel 18 is connected to the main air supply system 38.

[0031] The pseudo-bearing body 2 includes a pseudo-bearing shell 21 , which is provided with an oil inlet 24 and an oil return port 25 communicating with the inner cavity. An oil supply system 37 connected to the oil inlet 24 and the oil return port 25 is provided outside the pseudo-bearing shell 21 .

[0032] The pseudo-bearing shell 21 is provided with an air filling port 202 communicating with the inner cavity, and the exterior of the pseudo-bearing shell 21 is provided with a secondary air supply system 39 connected to the air filling port 202 .

[0033] The pseudo-bearing housing 21 is provided with a plurality of sensor holes 34 communicating with the inner cavity. The sensor holes 34 are connected to temperature sensors 35 or pressure measuring tubes 36 . The temperature sensors 35 and the pressure measuring tubes 36 are connected to a testing system 40 .

[0034] The pseudo-turbine 1 includes a pseudo-turbine 5, a pseudo-volute 6, a volute end sealing ring 7, a turbine locking nut 8 and an oil collecting cover 9; The pseudo-compressor 3 includes a pseudo-impeller 10, a tachometer wheel 11, a locking nut 12, an oil collecting cover 2 13 and a compression end sealing ring 14; The pseudo-turbine 5 is composed of a pseudo-turbine 5 disk and pseudo-turbine blades 502, and a turbine axis hole 503 is set in the center of the turbine disk 501; the turbine end shaft of the rotating shaft 4 passes through the turbine axis hole 503, and the pseudo-turbine 5 is fixed to the rotating shaft 4 by the turbine locking nut 8; the material of the pseudo-turbine 5 is the same as that of the real turbocharger turbine, and can also be replaced by a metal material with a higher density. The mass, center of mass and axial length of the pseudo-turbine 5 need to be designed to be consistent with the real turbine.

[0035] The pseudo-volute 6 includes a volute wall 1 601 and a volute wall 2 602. The inner diameter of the volute wall 1 601 is slightly larger than the maximum diameter of the pseudo-turbine blades 502, and a pseudo-turbine blade tip gap 504 is formed between the volute wall 1 601 and the pseudo-turbine blades 502. A tangential through hole 15 is provided in the circumferential direction of the volute wall 1 601. The axial position of the tangential through hole 15 is aligned with the pseudo-turbine blade inlet 505. The tangential direction of the tangential through hole 15 from outside to inside is consistent with the rotation direction of the pseudo-turbine 5. The tangential through holes 15 are evenly distributed around the circumference, and a volute wall flange 603 is also provided on the volute wall 1 601 for installation and positioning of the volute wall 1 601; A second volute flange 604 is provided at one end of the second volute wall 602, and a second volute stopper 605 is provided at the other end. A clearance fit is formed between the second volute wall stopper 605 and the first volute wall 601, and an elastic sealing ring 17 is provided at the clearance fit. The inner diameter of the second volute wall 602 is greater than the outer diameter of the first volute wall 601. When the second volute wall 602 and the first volute wall 601 are connected to each other, a pseudo-volute annular cavity 1801 is formed. The pseudo-volute annular cavity 1801 is connected to the tangential through hole 15 downstream and to the inlet flow channel 1802 upstream, and together they form the pseudo-volute flow channel 18; a pseudo-volute inlet 606 is also provided on the volute wall 2 602 for the intake of the pseudo-turbine 5.

[0036] The oil collecting cover 9 includes an oil collecting cover wall 901 and a transparent baffle 902; the oil collecting cover 9 is arranged between the stop 201 of the vortex end of the pseudo-bearing body and the vortex shell wall 2 602; an oil outlet 903 is opened on the oil collecting cover wall 901, and after the oil collecting cover 9 is installed, the oil outlet 903 is vertically downward.

[0037] A support sleeve 16 is provided between the oil collecting cover 9 and the volute wall 601 to limit the axial distance between the two. The bolt 41 passes through the volute wall 2 602, the volute wall 1 601, the support sleeve 16, the transparent baffle 902 and the oil collecting cover wall 901 in sequence and is then pressed against the stop 201 of the vortex end of the pseudo-bearing body.

[0038] The inner diameter of the transparent baffle 902 is slightly larger than the outer diameter of the pseudo-turbine extension section 506, and an oil collecting cover sealing ring 904 is arranged between the inner diameter of the transparent baffle 902 and the pseudo-turbine sealing ring groove 507 on the pseudo-turbine 5 extension section, so that a relatively closed space is formed between the oil collecting cover 9 and the pseudo-bearing body 2.

[0039] The pseudo-impeller 10 is a bladeless rotating metal part. The material of the pseudo-impeller 10 is the same as that of the real turbocharger impeller. A metal material with a higher density can also be used instead. The mass, center of mass, and axial length of the pseudo-impeller 10 need to be designed to be consistent with those of the real impeller. A speed measuring blade 1101 is set on the outside of the speed measuring wheel 11; the speed measuring wheel 11 is made of aluminum alloy, and through holes are set in the centers of the pseudo-impeller 10 and the speed measuring wheel 11, and the pseudo-impeller 10 and the speed measuring wheel 11 are locked on the rotating shaft 4 in turn through the locking nut 12; the locking nut 12 is made of aluminum alloy, and its end is flat.

[0040] The oil collecting cover 13 is a thin-walled metal cover. A second stopper 1301 is provided on the oil collecting cover 13 and is fastened to the stopper of the pressure end of the pseudo-bearing body 2. A plurality of second windows 1302 are provided on the oil collecting cover 13 at a location where the position of the pressure end sealing ring outlet 1401 can be clearly observed. A second transparent window 1303 is provided at the location of the second windows 1302. An oil outlet port 1304 is provided on the oil collecting cover 13. After the oil collecting cover 13 is installed on the pseudo-bearing body 2, the oil outlet port 1304 is directed downward. A speed measuring hole 1305 is provided on the oil collecting cover 13 at a position corresponding to the speed measuring wheel 11, for inserting a speed sensor 19 at this position. The speed sensor 19 is sealed and fixed to the speed measuring hole 1305 by threads or sealant, and the probe of the speed sensor 19 faces the speed measuring blade 1101. A displacement measuring hole 1306 is provided on the oil collecting cover 13 at a position corresponding to the pressure end of the rotating shaft 4. The displacement sensor 20 is sealed and fixed to the displacement measuring hole 1306 by threads or sealant, and the probe of the displacement sensor 20 faces the end of the locking nut 12. The transparent baffle 902 and the transparent window 1303 of the oil collecting cover 13 are made of organic glass or ordinary glass with good transparency.

[0041] The pseudo-bearing body 2 includes a pseudo-bearing shell 21, an air charging port 202, an oil flow channel 23, an oil inlet 24, an oil return port 25, a floating bearing 26, a thrust bearing 27, a thrust sleeve 28, an impeller sleeve seat 29, a pressure end seal assembly 30, a vortex end seal assembly 31, a vortex end stop end face 32 and a pressure end stop end face 33; The compression end sealing assembly 30 includes a shaft seal 3001, an oil baffle 3002 and a compression end sealing ring 14; The vortex end sealing assembly 31 includes a vortex end sealing ring 7; The pseudo-bearing body 2 is provided with several sensor holes 34 for correspondingly connecting the temperature sensor 35 and the pressure measuring tube 36 ; the positions of the sensor holes 34 should avoid the temperature sensor 35 probe and the pressure measuring tube 36 from contacting the oil in the pseudo-bearing body 2 after insertion.

[0042] The oil supply system 37 includes an oil tank 3701, an oil pump 3702, an oil filter 3703, a heater 3704, an oil inlet line 3705, an oil return line 3706, and an oil flow meter 3707. The oil tank 3701 is a closed oil tank, and the oil supply system 37 is also a closed system. The main air supply system 38 includes a main regulating valve 3801 , a main flow meter 3802 , an air compressor 3803 and a main air pipeline 3804 .

[0043] The secondary air supply system 39 includes a secondary air regulating valve 3901 , a secondary air flow meter 3902 , a secondary air pipeline 3903 and a secondary air compressor 3904 ; The testing system 40 includes a data acquisition system, a control system, and a measuring cup 42 provided below the oil outlet 1 903 and the oil outlet 2 1304 .

[0044] The pseudo-volute inlet 606 is connected to the main air supply system 38; the charging port 202 is connected to the secondary air supply system 39; the oil inlet 24 and the oil return port 25 are connected to the oil supply system 37; the structure in the sensor hole 34 is connected to the test system 40; The axial distance between the end face of the volute wall 601 and the end face of the transparent baffle 902 is not less than 10 mm, and the axial distance between the rim wall of the pseudo-impeller 10 back plate and the wall of the impeller sleeve 29 is not less than 10 mm.

[0045] Tangential through holes 15 are evenly distributed 8-20 around the circumference, and the tangential through holes 15 have an aperture of 1-4mm; The radial clearance of the pseudo-volute annular cavity formed by the connection of the volute wall 1 601 and the volute wall 2 602 is not less than 2 mm, and the axial length is not less than 10 times the radial clearance; The cross-sectional area of the pseudo-volute inlet 606 is not less than the sum of the cross-sectional areas of all tangential through holes 15; The transparent baffle 902 and the transparent window of the oil collecting cover 2 13 are made of organic glass or ordinary glass with good transparency, and the thickness is not less than 5mm.

[0046] The speed measuring wheel 11 is made of aluminum alloy, and the speed measuring blades have a height of 1-2 mm, a thickness of 0.3-1 mm, and a number of 2-16 blades.

[0047] The above is an embodiment of the present invention in state one. At this time, the high-pressure gas supplied by the main air supply system 38 acts on the pseudo-turbine 5, driving it to rotate and do work. At this time, there is high-pressure gas in the flow channel of the pseudo-turbine 5, and the back disk of the pseudo-turbine 5 is in contact with the atmospheric environment. Therefore, the pseudo-turbine 5 will generate an axial force toward the compression end, simulating the operating state of the actual turbocharger rotor system where the resultant axial force is toward the compression end.

[0048] like Figure 12 As shown, the present invention also discloses a method for testing the oil leakage resistance of a turbocharger, which can flexibly control any single variable among the three variables that affect the negative pressure oil leakage characteristics, thereby simplifying the debugging difficulty and testing time of the negative pressure oil leakage experiment; Step 1: First, conduct an experiment in which the simulated bearing body 2 is under negative pressure and the rotating shaft 4 is directed toward the pressure end under the action of axial force. Before the experiment begins, connect the inlet of the secondary air compressor 3904 to the secondary air pipeline 3903. When installing the simulated turbine 5, point its discharge end toward the turbine end, and align the axial position of the tangential through hole 15 on the volute wall 1 601 with the simulated turbine blade inlet 505. Turn on the oil pump 3702 in the oil supply system 37, so that the pressure in the oil inlet pipeline 3705 reaches the minimum oil pressure required for stable and reliable operation of the bearing system. Step 2: Start the secondary air compressor 3904 (vacuum pump function), open the secondary air regulating valve 3901, adjust the opening or control the speed of the air compressor 3803, so that the pressure in the pseudo-bearing body 2 is stabilized at -15kPa; Step 3: Open the main regulating valve 3801 to allow the high-pressure air in the main air supply system 38 to enter the pseudo-turbine 1. The high-pressure air expands in the pseudo-turbine 1 to produce work, causing the shaft 4 to rotate. By adjusting the opening of the main regulating valve 3801, the shaft 4 can be kept running stably at a certain speed. Step 4: Observe whether there is oil overflow from the compression end sealing ring outlet 1401 and the turbine end sealing ring outlet 701 through the transparent windows on the oil collecting cover 1 9 and the oil collecting cover 2 13. If there is oil overflow, run stably for 20-60 minutes, and obtain the oil leakage at the turbine end sealing ring 7 and the compression end sealing ring 14 by measuring the amount of oil in the beaker below the oil outlet 1 903 and the oil outlet 2 1304 and the mass change of the oil collecting cover 1 9 and the oil collecting cover 2 13 respectively; In step 5, if no oil leakage is observed at the sealing ring, a new operating condition is changed by controlling a single variable. After stable operation, step 4 is executed. Controlling a single variable includes: controlling the pressure in the cavity of the pseudo-bearing body 2 (continuously increasing from -15kPa to 0kPa) by controlling the speed of the secondary air compressor 3904 or the opening of the secondary air regulating valve 3901; controlling the oil pressure by controlling the speed of the oil pump 3702; and controlling the speed of the shaft 4 by controlling the main regulating valve 3801. After each of the above operating conditions is stabilized, the oil supply pressure, the pressure in the cavity of the pseudo-bearing body 2, the gas temperature in the cavity of the pseudo-bearing body 2, the speed of the shaft 4, the displacement of the shaft 4, the oil leakage at the pressure end, and the oil leakage at the turbine end are recorded. Step 6: When the pressure of the simulated bearing body 2 is adjusted to close to 0 kPa, the experiment is temporarily stopped; the outlet of the secondary air compressor 3904 is connected to the secondary air pipeline 3903; Step 7: Start the secondary air compressor 3904 (blower function), open the secondary air regulating valve 3901, adjust the opening or control the speed of the air compressor 3803, so that the pressure in the pseudo-bearing body 2 can achieve a positive pressure of 0-15kPa; Step 8: Execute steps 3 to 5, during which the pressure in the cavity of the pseudo-bearing body 2 continuously increases from 0 kPa to 15 kPa; Step nine, after the above steps are completed, the experiment is temporarily stopped; the pseudo-volute 6 and the pseudo-turbine 5 are removed, and then the pseudo-turbine 5 is reversely installed on the rotating shaft 4, that is, the row end of the pseudo-turbine 5 is facing the pressure end; the volute wall 1 607 is replaced for installation, and the installation method and size of the replacement volute wall 1 607 are exactly the same as those of the volute wall 1 601, except that the axial position of the tangential through hole 15 on it corresponds to the inlet 505 of the pseudo-turbine blade installed in the reverse direction, and the opening direction of the tangential through hole 15 is also opposite to the direction of the tangential through hole 15 on the volute wall 1 601; in this way, an experiment is carried out in which the rotating shaft 4 points to the vortex end under the action of axial force; Step 10, execute steps 2 to 8; Step 11: End of the experiment.

[0049] Example 2: like Figure 11 As shown, when the pseudo-turbine 5 and the volute wall 1 601 are installed in reverse, they are in state 2. At this time, an axial force toward the vortex end is generated on the pseudo-turbine 5, simulating the operating state in which the resultant axial force of the actual turbocharger rotor system is directed toward the vortex end.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A turbocharger oil leakage resistance test system, comprising a pseudo-turbine (1), a pseudo-bearing body (2), a pseudo-compressor (3) and a rotating shaft (4); characterized in that: The pseudo-turbine (1) comprises a pseudo-volute (6) connected to one end of the pseudo-bearing body (2), an oil collecting cover (9) covering a vortex end sealing ring (7) is provided between the pseudo-volute (6) and the pseudo-bearing body (2), and an oil outlet (903) is provided at the bottom of the oil collecting cover (9); The pseudo-compressor (3) includes an oil collecting hood (13) connected to the other end of the pseudo-bearing body (2), the oil collecting hood (13) covers the pressure end sealing ring (14), and the bottom of the oil collecting hood (13) is provided with an oil outlet (1304), and the oil collecting hood (13) is connected to a visual window corresponding to the pressure end sealing ring outlet (1401).

2. The turbocharger oil leakage resistance testing system according to claim 1, characterized in that: The pseudo-compressor (3) includes a speed measuring wheel (11) connected to the rotating shaft (4), the speed measuring wheel (11) is located in the second oil collecting cover (13), and the second oil collecting cover (13) is connected to a speed sensor (19) that matches the speed measuring wheel (11).

3. The turbocharger oil leakage resistance testing system according to claim 1, characterized in that: The pseudo-compressor (3) includes a displacement sensor (20) connected to the two ends of the oil collecting cover (13), and a measuring gap is provided between the detection end of the displacement sensor (20) and the end of the rotating shaft (4).

4. The turbocharger oil leakage resistance testing system according to claim 1, characterized in that: The pseudo-turbine (1) comprises a pseudo-turbine (5) connected to the rotating shaft (4), and the pseudo-turbine (5) can be installed on the rotating shaft (4) in both forward and reverse directions.

5. The turbocharger oil leakage resistance testing system according to claim 1, characterized in that: The oil outlet 1 (903) and the oil outlet 2 (1304) are respectively connected to a measuring cup (42).

6. The turbocharger oil leakage resistance testing system according to claim 1, characterized in that: The oil collecting hood (9) comprises an oil collecting hood wall (901), one end of the oil collecting hood wall (901) is connected to the pseudo-bearing body (2), and the other end of the oil collecting hood wall (901) is fixedly connected to a transparent baffle (902) close to the turbine end sealing ring outlet (701), and a hole is opened on the transparent baffle (902), and an oil collecting hood sealing ring (904) matching the rotating shaft (4) is arranged in the hole.

7. The turbocharger oil leakage resistance testing system according to claim 1, wherein: The pseudo-volute (6) includes a volute wall 1 (601) and a volute wall 2 (602) which are sequentially arranged from the outside to the inside, a pseudo-volute flow channel (18) is provided between the volute wall 1 (601) and the volute wall 2 (602), and the volute wall 1 (601) is provided with a plurality of tangential through holes (15) connected to the pseudo-volute flow channel (18) around the pseudo-turbine (5), and the pseudo-volute flow channel (18) is connected to the main air supply system (38).

8. The turbocharger oil leakage resistance testing system according to claim 1, characterized in that: The pseudo-bearing body (2) comprises a pseudo-bearing shell (21), an oil inlet (24) and an oil return port (25) communicating with an inner cavity are provided on the pseudo-bearing shell (21), and an oil supply system (37) connected to the oil inlet (24) and the oil return port (25) is provided outside the pseudo-bearing shell (21).

9. The turbocharger oil leakage resistance testing system according to claim 8, characterized in that: The pseudo-bearing shell (21) is provided with an air filling port (202) communicating with the inner cavity, and the exterior of the pseudo-bearing shell (21) is provided with a secondary air supply system (39) connected to the air filling port (202).

10. The turbocharger oil leakage resistance testing system according to claim 8, characterized in that: The pseudo-bearing shell (21) is provided with a plurality of sensor holes (34) communicating with the inner cavity, the sensor holes (34) are connected to temperature sensors (35) or pressure measuring tubes (36), and the temperature sensors (35) and the pressure measuring tubes (36) are connected to a testing system (40).

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