Internal Combustion Engine Cylinder Liner - Piston Ring Performance Verification Device for Simulating Gas Fuel Environment

Abstract

The invention discloses a performance verification device for an internal combustion engine cylinder liner - piston ring simulating a gas fuel environment, which comprises a test platform, a cylinder liner slice fixing device, a piston ring slice fixing device, a lubricating oil supply device, a sealing chamber and a fuel supply device; the piston ring slice fixing device comprises a reciprocating power device and a driving part and a driven part connected through a vertical sliding pair; a containing cavity is arranged at the bottom of the driven part, a piston ring slice clamp is arranged in the containing cavity, a sliding groove is arranged on the side wall, and the side part of the piston ring slice clamp is connected with the inner side wall of the sliding groove through a tensile - compression force sensor; a weight placing space is arranged at the top of the driven part, and oil holes are arranged inside the driving part and the driven part for supplying lubricating oil to the moving parts; the reciprocating power device transmits the reciprocating motion power to the piston ring slice through the driving part and the driven part, so as to simulate the reciprocating motion of the cylinder liner - piston ring; the invention can simulate the real working conditions of the internal combustion engine to the greatest extent and provide technical support for the tribological design of the internal combustion engine cylinder liner - piston ring.

Description

Technical Field

[0001] The invention belongs to the field of internal combustion engines, and relates to a cylinder liner-piston ring friction pair testing device, and in particular to an internal combustion engine cylinder liner-piston ring performance verification device simulating a gas fuel environment. Background Art

[0002] Diesel engines / gasoline engines are widely used in vehicles such as automobiles and ships due to their excellent performance and mature industrial chain. However, with energy conservation and environmental protection becoming the theme of the times, fuel prices are gradually rising, emission requirements are becoming increasingly stringent, and the development of traditional internal combustion engines is facing challenges. At the same time, as a non-renewable energy source, fossil fuels have the characteristics of poor sustainability, uneven regional distribution, and large greenhouse gas emissions. It is reported that CO2 emissions related to energy utilization have increased from 15.51 billion tons in 1975 to 32.53 billion tons in 2017. The limitations of fossil energy have promoted the development of carbon emission reduction fuels. For gas fuels, there are natural gas, petroleum gas, dimethyl ether, etc. As a clean energy, hydrogen / ammonia energy has become an important way to alleviate the energy crisis and achieve global carbon emission reduction with its advantages of zero carbon, recyclability, wide sources and diverse forms of utilization.

[0003] Although the market prospects of hydrogen / ammonia energy are broad, there are still a series of technical problems in its large-scale commercial application. Among them, the development of safe, reliable, economical and efficient hydrogen / ammonia energy fuel internal combustion engine technology is an important prerequisite for the development and large-scale application of hydrogen / ammonia energy in the field of transportation. At present, hydrogen / ammonia fuel internal combustion engines not only have the characteristics of zero carbon emissions, but also rely on the relatively mature technology and industrial chain of traditional internal combustion engines. However, in its engineering application process, there is a common problem of poor adaptability of key component materials that needs to be solved urgently. The cylinder liner-piston ring friction pair is the core component of the internal combustion engine for energy conversion. Its performance directly affects the power, reliability and economy of the hydrogen / ammonia fuel internal combustion engine. Studies have shown that in the total energy loss of the internal combustion engine, the energy loss caused by friction and wear accounts for 4%-15%, while the friction loss of the cylinder liner-piston ring friction pair accounts for 40%-55% of the total friction loss. At the same time, in the hydrogen / ammonia fuel environment, tribological problems follow one after another, such as stress corrosion, lubricant deterioration and high heat load.

[0004] Simulation tests are an important means for tribological research. In a non-combustion environment, by simulating the relative movement speed and load of the cylinder liner-piston ring specimen, etc., data such as the friction coefficient, wear amount, and lubricating oil film thickness during the friction process are monitored and obtained, and their change trends and mutual influence laws are analyzed to study the friction and wear mechanism and control mechanism of the friction pair. This method is simple to operate, convenient for disassembly and assembly, and can simultaneously collect data such as friction force, load, temperature, pressure, and oil film thickness that are difficult to obtain in actual machine tests. However, when conducting friction and wear tests in a hydrogen / ammonia fuel environment, once leakage occurs, it is easy to cause explosion / poisoning, seriously endangering human life and property safety. In addition, there is still some room for environmental protection improvement for internal combustion engines using other gaseous fuels.

[0005] The patent document (application number 201310134469.X) discloses a double piston-cylinder liner friction and wear test bench, but it does not simulate the fuel environment and friction conditions such as temperature and pressure. The patent document (application number CN201811121402.1) discloses a multifunctional internal combustion engine cylinder liner piston ring friction and wear testing machine, but only adds the influence of temperature factors on the performance of the cylinder liner-piston ring. The patent document (application number CN202210833859.5) discloses a multifunctional high-pressure hydrogen / ammonia environment material friction and wear in-situ testing device under non-lubricated conditions, which provides power for the rotating shaft through magnetic coupling drive, ensuring the safety of the equipment, but cannot simulate the environmental humidity, the lubrication state of the cylinder liner-piston ring friction pair, and measure the oil film thickness between the friction pairs. Therefore, it is necessary to design a cylinder liner-piston ring performance verification platform that can conduct friction tests and performance tests in a high-temperature, high-pressure, and hydrogen / ammonia fuel environment and ensure the safe and reliable sealing of the entire gas circulation process. Summary of the Invention

[0006] The purpose of the present invention is to provide an internal combustion engine cylinder liner-piston ring performance verification device that simulates a gaseous fuel environment, which is used to conduct cylinder liner-piston ring friction performance tests in the required gaseous fuel environment; another purpose of the present invention is to improve the measurement accuracy of the friction force during the cylinder liner-piston ring friction performance test; another purpose of the present invention is to enrich the characterization of state parameters during the friction process, add a lubricating oil film thickness monitoring device, and realize the non-destructive measurement of the lubricating oil film thickness in a harsh environment.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] An internal combustion engine cylinder liner-piston ring performance verification device that simulates a gaseous fuel environment, comprising

[0009] A test platform for conducting internal combustion engine cylinder liner-piston ring performance verification experiments;

[0010] The cylinder liner slice fixing device is arranged on the test platform and is used for clamping and fixing the cylinder liner slice;

[0011] The piston ring slice fixing device is used for clamping the piston ring slice and moving it back and forth on the cylinder liner slice. It includes a reciprocating power device that can move back and forth in the horizontal direction, and a driving part and a driven part connected by a vertical sliding pair; a receiving cavity with an opening towards the bottom is arranged in the driven part, and a piston ring slice clamp is arranged in the receiving cavity. The piston ring slice clamped by the piston ring slice clamp is in relative contact with the cylinder liner slice. A sliding groove allowing the piston ring slice clamp to slide horizontally within a certain range is arranged on the inner side wall of the receiving cavity. The side part of the piston ring slice clamp is connected to the inner side wall of the sliding groove through a tensile and compressive force sensor. A spherical pair restricting its vertical movement is arranged between the top of the piston ring slice clamp and the inner top of the receiving cavity; a weight placing space for providing the normal friction force of the cylinder liner - piston ring is arranged at the top of the driven part; the reciprocating power device transmits the reciprocating motion power to the piston ring slice through the driving part and the driven part, thereby driving the piston ring slice to reciprocate relative to the cylinder liner slice;

[0012] The lubricating oil supply device provides lubricating oil for the relative friction between the piston ring slice and the cylinder liner slice. It includes a lubricating oil tank, a first lubricating oil hole arranged in the driving part, and a second lubricating oil hole arranged in the driven part. The lubricating oil tank is connected to the inlet of the first lubricating oil hole through a lubricating oil hose. The bottom outlet of the first lubricating oil hole is connected to the top of the second lubricating oil hole through a guiding device, and the bottom outlet of the second lubricating oil hole is communicated into the receiving cavity;

[0013] The sealed chamber covers above the test platform and wraps the cylinder liner slice fixing device, the piston ring slice fixing device and the lubricating oil supply device, providing a sealed space required for the gas fuel environment for the cylinder liner - piston ring performance experiment;

[0014] The fuel supply device is connected to the sealed space formed by the sealed chamber through a pipeline and is used for providing the required type of fuel.

[0015] Further, the cylinder liner slice fixing device includes a fixed base and a cylinder liner slice longitudinal clamp and a cylinder liner slice transverse clamp arranged on the fixed base. The fixed base is fixedly installed on the test platform. An arc - shaped groove for accommodating the cylinder liner slice is arranged on the fixed base. The cylinder liner slice longitudinal clamp and the cylinder liner slice transverse clamp limit the cylinder liner slice in the arc - shaped groove longitudinally and transversely respectively, realizing the clamping of the cylinder liner slice.

[0016] Further, a heating module capable of heating the cylinder liner slice and an ultrasonic oil film thickness measuring device for detecting the lubricating oil film thickness are arranged at the bottom of the fixed base. The heating module includes a heating groove arranged at the bottom of the fixed base, a heating device arranged in the heating groove, and a heat transfer gasket arranged between the heating groove and the arc - shaped groove.

[0017] Furthermore, there are two grooves on the test platform under the fixed base. One of the grooves corresponds to the heating tank, and together they form a relatively sealed heating chamber filled with a heat-conducting medium. The heating device evenly transfers heat to the cylinder liner slice through the heat-conducting medium and the heat-transfer gasket. The other groove corresponds to the ultrasonic oil film thickness measuring device, forming a relatively sealed cooling chamber that wraps the ultrasonic oil film thickness measuring device, and the cooling chamber is filled with flowing cooling medium.

[0018] Furthermore, the reciprocating power device includes a hydraulic cylinder, a push-pull rod, a roller, and a horizontal guide rail. The horizontal guide rail is installed in the sealed chamber along the movement direction of the cylinder liner - piston ring through a support member;

[0019] The cylinder body of the hydraulic cylinder is embedded in the side wall of the sealed chamber. The piston rod of the hydraulic cylinder is inside the sealed chamber. One end of the push-pull rod is connected to the piston rod, and the other end is connected to the roller. The roller is fitted on the horizontal guide rail, and the horizontal guide rail provides a limit for the rolling direction of the roller, thereby restricting the push-pull rod to move horizontally.

[0020] Furthermore, the vertical sliding pair includes a plurality of vertical guide tubes provided at the top of the driven member and guide posts provided at the bottom of the driving member. The diameter of the guide posts is slightly smaller than that of the vertical guide tubes. Each guide post is inserted into a vertical guide tube, and each guide post is provided with rolling bodies that cooperate with the inner wall of the vertical guide tube to limit the movement of the guide post relative to the vertical guide tube within a certain range in the up and down directions.

[0021] Furthermore, at least one of the plurality of vertical guide tubes is connected to the bottom outlet of the first lubricating oil hole through a flexible seal sleeve at the top, and the corresponding bottom of the vertical guide tube is connected to the top inlet of the second lubricating oil hole, using the vertical guide tube as a diversion device.

[0022] Furthermore, the plurality of vertical guide tubes are symmetrically arranged around the weight placement space.

[0023] Furthermore, the heating device includes a heating power supply, heating wires, and infrared heating tubes provided in the heating tank. The heating power supply is connected to the infrared heating tubes through the heating wires for power supply.

[0024] Furthermore, the fuel supply device includes a plurality of fuel gas cylinders, a flow control valve, and a humidifying device. The plurality of fuel gas cylinders are connected to the flow control valve through pipelines, and then connected to the humidifying device. The outlet of the humidifying device is connected to the sealed chamber through a gas supply pipeline.

[0025] The present invention has the following main beneficial effects compared with the prior art:

[0026] 1. This test platform uses a kinematic pair composed of rolling elements and vertical guide tubes to achieve a flexible connection between the driving part and the driven part. While ensuring the reciprocating motion of the piston ring slice specimen in the horizontal direction, it can also alleviate the influence of the vertical vibration of the driving device. The gravity of the weights is directly used as the load, and there is no need to add a load sensor.

[0027] 2. This test platform uses a hydraulic cylinder as the power source and only extends its power output end into the sealed chamber, which can achieve the static seal of the driving device, avoid the dynamic seal problems that occur when using equipment such as motors, and improve the safety and seal reliability of the test platform.

[0028] 3. This test platform uses ultrasonic equipment to monitor the lubricating oil film thickness between the friction pairs. When using the traditional contact resistance method to measure the oil film thickness, the relevant equipment is directly exposed to high temperature, high pressure and hydrogen / ammonia environments. At the same time, circulating cooling water is used to ensure that the measurement position is within the normal working temperature range of the probe, alleviating the influence of the heating device on the measurement accuracy.

[0029] 4. This test platform reduces the redundant volume of gas in the sealed chamber by setting packing, which can effectively reduce the test consumption of hydrogen / ammonia gas, and reduce the sealing pressure and the risk and scale in case of accidents.

[0030] 5. The humidifying device of this test platform can not only adjust the humidity of hydrogen / ammonia gas, but also prevent the occurrence of "flashback" when hydrogen / ammonia gas in the sealed chamber is accidentally ignited, eliminating the threat of open fire to the high-pressure hydrogen / ammonia gas cylinders in the open state.

[0031] 6. The present invention provides a brand-new lubricating oil supply system, which avoids the problem that the lubricating oil supply system in the prior art interferes with the frictional movement. At the same time, the present invention lubricates the flexible connection between the driving part and the driven part through the supplied lubricating oil, avoiding the interference of rigid connection on the friction test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of an internal combustion engine cylinder liner - piston ring performance verification device for simulating a gas fuel environment in an embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure of the sealed chamber in an embodiment of the present invention.

[0034] Figure 3 It is the three - view drawing of the cylinder liner slice fixing device in an embodiment of the present invention, where Figure 3 A is the front view of the cylinder liner slice fixing device, Figure 3 B is the left view of the cylinder liner slice fixing device, Figure 3 C is the top view of the cylinder liner slice fixing device.

[0035] Figure 4 This is a schematic diagram of the piston ring slice fixing device in the embodiment of the present invention.

[0036] Figure 5 It is Figure 4 a partial enlarged view at Y in

[0037] Figure 6 It is Figure 4 a partial enlarged view at X in

[0038] In the figure, 1 - high - pressure argon gas cylinder, 2 - high - pressure hydrogen / ammonia gas cylinder, 3 - pressure reducing valve, 4 - first stop check valve, 5 - flow control valve, 6 - humidifying device, 7 - second stop check valve, 8 - humidity sensor, 9 - inlet / outlet water port, 10 - waste gas recovery equipment, 11 - wire of tension and compression sensor, 12 - sealed chamber, 13 - inlet / outlet oil port, 14 - hydraulic cylinder, 15 - industrial control computer, 16 - groove, 17 - cooling device, 18 - ultrasonic oil film thickness measuring device, 19 - heating device, 20 - pressure gauge, 21 - third stop check valve, 22 - resistance heater, 23 - piston ring slice fixing device, 24 - cylinder sleeve slice fixing device, 25 - lubricating oil hose, 26 - horizontal guide rail, 27 - lubricating oil tank, 28 - packing, 29 - push - pull rod, 30 - cylinder seal, 31 - inlet / outlet air pipe seal, 32 - wire seal, 33 - roller, 34 - high - level oil tank, 35 - heat - transfer oil hose, 36 - heating power supply, 37 - heating wire, 38 - heating tube, 39 - ultrasonic oscilloscope, 40 - data line, 41 - ultrasonic probe, 42 - circulating water pump, 43 - radiator, 44 - metal hose, 45 - piston ring slice sample, 46 - cylinder sleeve slice sample, 47 - loading weight, 48 - heating chamber, 49 - cooling chamber, 50 - partition board, 51 - oil discharge port, 52 - longitudinal fixture for cylinder sleeve slice, 53 - transverse fixture for cylinder sleeve slice, 54 - heat - transfer gasket, 55 - first lubricating oil hole, 56 - vertical guide tube, 57 - ball arm, 58 - ball hinge structure, 59 - rolling element, 60 - auxiliary fixture, 61 - main fixture, 62 - tension and compression sensor, 63 - bolt fixture, 64 - fixed base, 65 - shoulder, 66 - spherical shell, 67 - sphere, 68 - flexible seal sleeve, 69 - first oil outlet, 70 - driving part, 71 - driven part, 72 - second oil outlet, 73 - second lubricating oil hole. Detailed implementation manners

[0039] To make the purpose, technical solutions and advantages of the present invention more clearly expressed, the following describes the detailed implementation manners of the present invention with reference to the accompanying drawings. However, the implementation and protection of the present invention are not limited thereto.

[0040] In the following embodiments, the present invention is illustrated by taking the simulated hydrogen / ammonia energy as an example. It should be noted that the simulated fuel environment of the present invention is not limited to the hydrogen / ammonia energy environment, but can also be other gaseous fuels for internal combustion engines; the directional terms mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", etc., are only references to the directions of the attached drawings and are not used to limit the present invention.

[0041] As Figures 1 to 6 shown, an internal combustion engine cylinder liner - piston ring performance verification device for simulating a gaseous fuel environment includes a test platform, a cylinder liner slice fixing device 24, a piston ring slice fixing device 23, a lubricating oil supply device, a sealing chamber 12, and a gaseous fuel supply device; the test platform is used to conduct the performance verification experiment of the internal combustion engine cylinder liner - piston ring.

[0042] The cylinder liner slice fixing device 24 is arranged on the test platform and is used for clamping and fixing the cylinder liner slice specimen 46.

[0043] The piston ring slice fixing device 23 is used to clamp the piston ring slice specimen 45 to perform reciprocating motion on the cylinder liner slice. It includes a reciprocating power device capable of moving back and forth in the horizontal direction and a driving member 70 and a driven member 71 connected by a vertical sliding pair; a receiving cavity opening towards the bottom is arranged in the driven member 71, and a piston ring slice clamp is arranged in the receiving cavity. The piston ring slice specimen 45 clamped by the piston ring slice clamp is arranged in relative contact with the cylinder liner slice specimen 46. A sliding groove allowing the piston ring slice clamp to slide horizontally within a certain range is arranged on the inner side wall of the receiving cavity. The side part of the piston ring slice clamp is connected to the inner side wall of the sliding groove through a tensile and compressive force sensor 62. A spherical pair restricting its vertical movement is arranged between the top of the piston ring slice clamp and the top of the inner part of the receiving cavity; a weight placing space for providing the contact normal pressure between the cylinder liner and the piston ring is arranged at the top of the driven member 71; the reciprocating power device transmits the reciprocating motion power to the piston ring slice specimen 45 through the driving member 70 and the driven member 71, thereby driving the piston ring slice specimen to reciprocate relative to the cylinder liner slice specimen 46.

[0044] The lubricating oil supply device provides lubricating oil for the relative friction between the piston ring slice specimen 45 and the cylinder liner slice specimen 46. It includes a lubricating oil tank 27, a first lubricating oil hole 55 arranged in the driving member 70, and a second lubricating oil hole 73 arranged in the driven member 71. The lubricating oil tank 27 is connected to the inlet of the first lubricating oil hole 55 through a lubricating oil hose 25. The bottom outlet of the first lubricating oil hole 55 is connected to the top of the second lubricating oil hole 73 through a guiding device, and the bottom outlet of the second lubricating oil hole 73 is communicated to the inside of the receiving cavity.

[0045] The sealed chamber 12 covers above the test platform, enclosing the cylinder liner slice fixing device 24, the piston ring slice fixing device 23 and the lubricating oil supply device therein, providing a sealed space required for the gas fuel environment for the cylinder liner - piston ring performance experiment;

[0046] The fuel supply device is connected to the sealed space formed by the sealed chamber 12 through a pipeline, and is used to provide the required type of fuel.

[0047] As Figures 1 to 3 shown, as a preferred embodiment, the cylinder liner slice fixing device 24 includes a fixed base and a cylinder liner slice longitudinal fixture 52 and a cylinder liner slice transverse fixture 53 arranged on the fixed base. The fixed base is detachably and fixedly installed on the test platform through bolts. An arc-shaped groove for accommodating the cylinder liner slice specimen 46 is provided on the fixed base. The cylinder liner slice longitudinal fixture 52 and the cylinder liner slice transverse fixture 53 limit the cylinder liner slice specimen 46 in the arc-shaped groove longitudinally and transversely respectively, realizing the clamping of the cylinder liner slice specimen 46. As a specific embodiment, the cylinder liner slice transverse fixture 53 includes a fixed plate and a moving plate arranged opposite to the fixed plate, clamping the two ends of the cylinder liner slice specimen 46 respectively for transverse limiting. As Figure 3 shown, the fixed plate is fixedly arranged at the right end of the fixed base, and the moving plate is installed at the left end of the fixed base through a translation mechanism. The translation mechanism can adopt structures such as a lead screw nut mechanism, a bolt tightening structure, etc., and the specific implementation method is not limited. The left and right ends of the cylinder liner slice specimen 46 are clamped by the left and right translation of the moving plate; the cylinder liner slice longitudinal fixture 52 is a pressing plate that can move up and down. The pressing plate is installed near the left end of the fixed base through a lifting mechanism, and the pressing plate is driven by the lifting mechanism to press the left end of the cylinder liner slice specimen 46. The reason for pressing the left end is to avoid interfering with the movement of the piston ring slice specimen 45.

[0048] As a preferred embodiment, as Figure 3 shown, an oil discharge port 51 for discharging lubricating oil is provided at the bottom of the fixed plate, avoiding the deposition of lubricating oil on the surface of the specimen, and also facilitating subsequent oil analysis or recycling.

[0049] It should be noted that the cylinder liner slice specimen 46 of the present invention is a tile-shaped slice axially cut from the cylinder liner, and the piston ring slice specimen 45 is a sector slice or an arc slice corresponding to the radian of the cylinder liner slice specimen 46. For the specific slicing method, reference can be made to that recorded in CN203132825U, and the present invention will not elaborate further.

[0050] As a preferred embodiment, as Figure 3As shown in the figure, there is a heating module capable of heating the cylinder liner slice specimen 46 and an ultrasonic oil film thickness measuring device 18 for detecting the thickness of the lubricating oil film. The heating module includes a heating tank provided at the bottom of the fixed base 64, a heating device 19 provided in the heating tank, and a heat transfer gasket 54 provided between the heating tank and the cylinder liner slice specimen 46. The form of the heat transfer gasket 54 is not limited, and it can be a heat-conducting metal sheet welded to the fixed base 64 below the cylinder liner slice specimen 46.

[0051] The ultrasonic probe 41 of the ultrasonic oil film thickness measuring device 18 is closely attached to the bottom of the fixed base 64 and is used for non-destructive ultrasonic measurement of the oil film thickness on the cylinder liner slice specimen 46. In order to prevent the temperature change caused by the heating module or frictional heat generation from damaging the ultrasonic probe 41 or causing a decrease in the measurement performance of the ultrasonic probe 41; in the present invention, two grooves 16 are provided on the test platform below the fixed base. One of the grooves 16 corresponds to the heating tank and together forms a relatively sealed heating chamber 48. The heating chamber 48 is filled with a heat-conducting medium, and the heating device 19 transfers heat to the cylinder liner slice specimen 46 through the heat-conducting medium and the heat transfer gasket 54; the other groove 16 corresponds to the ultrasonic probe 41 of the ultrasonic oil film thickness measuring device 18 and forms a relatively sealed cooling chamber 49 that wraps the ultrasonic probe of the ultrasonic oil film thickness measuring device 18. The cooling chamber 49 is filled with a flowing cooling medium, and the cooling medium is supplied by a cooling medium circulation device.

[0052] As a specific embodiment, as Figure 2 shown, the ultrasonic oil film thickness measuring device 18 includes an ultrasonic probe 41 and an ultrasonic oscilloscope 39. The ultrasonic probe 41 is closely attached and installed at the bottom of the smooth fixed base. The ultrasonic probe 41 is led out to the outside through a data line 40 and connected to the ultrasonic oscilloscope 39. The signals collected by the ultrasonic oscilloscope 39 are processed by the industrial control computer 15 to obtain the results, and the existing technology can be specifically adopted.

[0053] As a specific embodiment, as Figure 2 shown, the cooling medium is water or a non-conductive liquid. The cooling medium circulation device includes a circulating water pump 42 and a radiator 43. The outlet of the cooling chamber 49 is connected to the inlet of the circulating water pump 42 through a pipeline. The outlet of the circulating water pump 42 is connected to the inlet of the radiator 43 through a pipeline. The outlet of the radiator 43 is connected to the inlet of the cooling chamber 49 through a metal hose 44. The radiator 43 can be, for example, a fin radiator or the like, and is not specifically limited. The ultrasonic probe 41 is cooled by circulating cooling water to improve the reliability of the ultrasonic probe 41 and avoid interference caused by the temperature rise of the heating device 19 and the frictional heat. The cooling chamber 49, the cooling medium, and the cooling medium circulation device together form a cooling device 17.

[0054] As a specific embodiment, the two grooves 16 can also be formed by separating a large groove machined on the specimen platform with an intermediate partition 50. The partition 50 can also play a role in supporting and fixing the base to prevent stress concentration.

[0055] As a specific embodiment, as Figure 3 shown, the heat-conducting medium in the heating chamber 48 can be heat-conducting silicone oil. To ensure that the heat-conducting silicone oil in the heating chamber is in a full state, a high-level oil tank 34 is also provided. The high-level oil tank 34 is connected to the heating chamber 48 through a heat-resistant heat-transfer oil hose 35. Since the high-level oil tank 34 is higher than the heating chamber 48, it can ensure that the heating chamber 48 is filled with heat-conducting silicone oil. At the same time, during the heating process, the expansion of the heat-conducting silicone oil is also released through the high-level oil tank 34 to prevent damage to the heating chamber 48.

[0056] As a preferred embodiment, as Figure 2 shown, the heating device 19 includes a heating power supply 36, a heating wire 37, and an infrared heating tube 38 disposed in the heating groove. The heating power supply 36 is connected to the infrared heating tube 38 through the heating wire 37 for power supply.

[0057] As a preferred embodiment, the heat transfer gasket 54 is made of a material with a relatively high heat transfer coefficient, such as copper, which can improve the heat transfer efficiency.

[0058] As a preferred embodiment, as Figure 1 and Figure 2 shown, the reciprocating power device includes a hydraulic cylinder 14, a push-pull rod 29, a roller 33, and a horizontal guide rail. The horizontal guide rail is installed on the test platform in the sealed chamber 12 along the movement direction of the cylinder liner - piston ring through a support member, or directly installed between the two side walls of the sealed chamber 12;

[0059] The cylinder body of the hydraulic cylinder 14 is embedded in the side wall of the sealed chamber 12. A static seal is provided between the cylinder body of the hydraulic cylinder 14 and the side wall of the sealed chamber 12 to ensure the sealing performance of the sealed space. The piston rod of the hydraulic cylinder 14 is inside the sealed chamber 12, and the inlet / outlet port 13 of the hydraulic cylinder 14 is arranged outside the sealed chamber 12; the left end of the push-pull rod 29 is connected to the piston rod and the roller 33 at the same time. The roller 33 is fitted and installed on the horizontal guide rail, and the horizontal guide rail provides a limit for the rolling direction of the roller 33, thereby restricting the push-pull rod 29 to move horizontally.

[0060] As a preferred embodiment, as Figure 1 、 Figure 4 and Figure 5As shown in the figure, the vertical sliding pair includes a plurality of vertical guide tubes 56 provided at the top of the follower 71 and guide posts provided at the bottom of the driving member 70. The diameter of the guide post is slightly smaller than the inner diameter of the vertical guide tube 56. The gap between the diameter of the guide post and the inner wall of the vertical guide tube 56 should not be too small or too large. If it is too small, it will affect the freedom of up and down movement. If the gap is too large, there will be a certain swing gap between the driving member 70 and the follower 71, which will affect the followability of the follower 71 during the reciprocating movement of the driving member 70.

[0061] As Figure 5 shown in the figure, each guide post is inserted into a vertical guide tube 56, and a rolling body 59 that is in contact and cooperation with the inner wall of the vertical guide tube 56 is provided on each guide post. The rolling body 59 is used to limit the up and down movement of the guide post relative to the vertical guide tube 56. The rolling body includes but is not limited to universal rolling balls and rollers.

[0062] As a preferred embodiment, as Figure 5 shown in the figure, at least one of the plurality of vertical guide tubes 56 is connected to the lubricating oil hole 55 through a flexible seal 68 at the top. The vertical guide tube 56 is used as a diversion device for lubricating oil diversion. Since there is a gap between the guide post and the inner wall of the vertical guide tube 56, the lubricating oil can be smoothly diverted. At the same time, due to the presence of lubricating oil, the frictional force during the up and down movement between the guide post and the vertical guide tube 56 is greatly reduced, meeting the requirement for applying the contact normal pressure during the friction process of the cylinder liner - piston ring. As a specific embodiment, the first lubricating oil hole 55 and the first oil outlet 69 at the upper end of the guide post together form a lubricating oil passage in the driving member 70.

[0063] As a preferred embodiment, as Figure 4 shown in the figure, the piston ring segment fixture includes a main fixture 61 and an auxiliary fixture 60. The body of the main fixture 61 is installed in the accommodating cavity, and a clamping portion that extends downward and matches the shape of the piston ring segment specimen 45 is provided at the bottom. The auxiliary fixture 60 is a free - type plate - like member that matches the shape of the piston ring segment. The auxiliary fixture 60 is detachably installed on the clamping portion of the main fixture 61 by bolts to clamp the piston ring segment specimen 45. As a further preference, as Figure 6 shown in the figure, shoulders 65 are respectively provided on the opposite sides of the clamping portion of the auxiliary fixture 60 and the main fixture 61 to limit the upward movement of the piston ring segment.

[0064] If you want to measure the frictional force when the piston ring segment slides relative to the cylinder liner segment, the piston ring segment fixture needs to have a certain free space for movement in this direction relative to the follower 71. Therefore, a sliding groove is provided on the side wall of the accommodating cavity, as Figure 4As shown, the sliding groove is arranged on the right side of the accommodating cavity. In a specific embodiment, the tensile and compressive force sensor 62 is arranged in the sliding groove. The left end of the tensile and compressive force sensor 62 is connected to the main fixture 61, and the right end is fixed on the right side wall of the sliding groove through a bolt fixture 63. To improve the limiting property and prevent the piston ring slicing fixture from shifting in the up and down direction, and at the same time minimize the influence of the internal friction of the measuring device on the measurement of the friction force between the cylinder liner and the piston ring, a spherical pair is arranged between the top of the piston ring slicing fixture and the inner top of the accommodating cavity. In this embodiment, the spherical pair includes a spherical arm 57 fixed to the inner top of the accommodating cavity and a spherical hinge structure 58 arranged at the lower end of the spherical arm 57. The spherical hinge structure 58 directly contacts the top of the main fixture 61. When the main fixture 61 slides left and right relative to the driven member 71, the spherical hinge structure 58 rolls accordingly, greatly reducing the friction force while providing vertical limitation. In this embodiment, the spherical hinge structure 58 includes a spherical shell 66 and a sphere 67. The sphere 67 is fixed to the lower end of the spherical arm 57, and the spherical shell 66 rotatably wraps around the sphere 67 to form a spherical higher pair. It should be noted that the left and right movement amplitude of the main fixture 61 relative to the driven member 71 should not be too large, generally meeting the deformation amplitude measured by the tensile and compressive force sensor 62 (generally a few millimeters). Otherwise, it will affect the measurement accuracy of the tensile and compressive force sensor 62.

[0065] As a preferred embodiment, as Figure 5 shown, the bottom outlet of the second lubricating oil hole 73 is a plurality of second oil outlets 72 arranged on the spherical arm 57. In this way, when the lubricating oil enters between the piston ring and the cylinder liner, it will also pass through the spherical hinge structure 58, further reducing the rolling friction force of the spherical hinge structure 58. The vertical guide tube 56, the second lubricating oil hole 73 and the second oil outlets 72 together constitute the lubricating oil circuit in the driven member 71.

[0066] As a preferred embodiment, a plurality of vertical guide tubes 56 are symmetrically arranged with the weight placement space as the center. Loading weights 47 are placed in the weight placement space to adjust the normal pressure on the piston ring slice. It should be noted that the loading weights 47 should be symmetrically placed with the piston ring slice specimen 45 as the center to ensure the uniformity of the normal pressure and prevent deflection. In addition, the weight placement space can be a vacant position arranged in the middle of the top of the driven member 71, or symmetrically arranged weight hanging rods, not limited to a specific weight placement method, as long as it can meet the taking and placing of the loading weights 47.

[0067] As a preferred embodiment, as Figure 1As shown in the figure, the fuel supply device includes a number of fuel gas cylinders, a flow control valve 5, and a humidifying device 6. The number of fuel gas cylinders is connected to the flow control valve 5 through a pipeline, and then connected to the humidifying device. The outlet of the humidifying device 6 is connected to the sealed chamber 12 through a gas supply pipeline. The sealed chamber 12 is provided with an outlet, which is sequentially connected to a third check valve 21 and an exhaust gas recovery device 10 through a pipeline, and a pressure gauge 20 is provided on the pipeline before the third check valve for observing the pressure in the sealed chamber 12.

[0068] Specifically, in the embodiment of the present invention, as Figure 1 shown, a high-pressure argon gas cylinder 1 (which can also be replaced by other inert gas cylinders) and a high-pressure hydrogen / ammonia gas cylinder 2 (which can be filled with hydrogen gas, ammonia gas, or a mixture of both according to needs) are provided. The high-pressure hydrogen / ammonia gas cylinder 2 is sequentially connected to a pressure reducing valve 3, a first check valve 4, a flow control valve 5, a humidifying device 6, a second check valve 7, and a humidity sensor 8 through pipelines, and hydrogen / ammonia gas is sent into the sealed chamber 12. The outlet of the high-pressure argon gas cylinder 1 is also connected to the pipeline between the first check valve 4 and the flow control valve 5 through a pipeline. The pressure reducing valve 3 reduces the high-pressure hydrogen / ammonia gas to the target pressure value, and cooperates with the hydrogen / ammonia gas flow control valve 5 to slowly adjust the pressure of hydrogen / ammonia gas in the sealed chamber 12. At the same time, observe the pressure gauge 20, and after reaching the expectation, close the gas regulation system. After the test, if gas replacement is required, open the high-pressure argon gas cylinder 1, and the argon gas passes through the pipeline and sequentially passes through the first check valve 4, the flow control valve 5, the humidifying device 6, the second check valve 7, and the humidity sensor 8, and pushes the gas in the sealed chamber 12 into the exhaust pipe and enters the exhaust gas recovery device through the third check valve 21. The humidifying device 6 adopts a long tube - short tube form, including a container filled with water and a long tube and a short tube inserted into the container. The bottom of the container is provided with an inlet / outlet 9 to control the water level and a heater to control the water temperature. The long tube extends deep into the bottom of the device (below the liquid level), and the short tube hangs above the water surface in the device. The gas enters the inside of the humidifying device 6 from the left long tube, and after being humidified by the accumulated water inside, it is discharged from the short tube. The water level is regulated through the inlet / outlet 9 at the bottom of the humidifying device 6, and the water temperature is controlled by a resistive heater 22, thereby realizing the control of the humidity of hydrogen / ammonia gas.

[0069] As a preferred embodiment, as Figure 2 shown, the lubricating oil tank 27 is installed at a high position inside the sealed chamber 12. It can be installed on the test platform through a support, or it can be installed on the sealed chamber 12. A throttle valve is provided on the lubricating oil hose 25 at the bottom outlet of the lubricating oil tank 27 to control the lubricating oil supply speed. An opening is provided at the upper end of the lubricating oil tank 27 to maintain the internal and external pressure balance.

[0070] As a preferred embodiment, a filler 28 is also provided in the remaining space in the sealed chamber 12. By reasonably selecting the shape and position of the filler 28, the effective volume of the gas in the sealed chamber 12 is minimized to the greatest extent possible.

[0071] It should be noted that the sealed chamber 12 is a housing member covering the test platform. As Figure 1 shown, it has at least 4 openings thereon to achieve environmental simulation, reciprocating motion, and data acquisition. All openings adopt static seals. The oil cylinder seal 30 provides a seal for the hydraulic cylinder 14, the inlet / exhaust pipe seal 31 provides a seal for the air supply pipe and the exhaust pipe, and the wire seal 32 provides a seal for the wire 11 of the tensile / compressive force sensor. To facilitate the disassembly and assembly of the specimen for repeated tests and to observe the movement of the friction pair at the same time, a sealed door with a transparent observation window (made of transparent material) is provided on the sealed chamber 12, which is strictly sealed during the test process to prevent the leakage of hydrogen / ammonia gas.

[0072] To further improve the degree of automation, the present invention should also include a controller (such as an industrial computer 15) for data acquisition, temperature control, flow control, and other controls.

[0073] It should be noted that the driving member 70 and the driven member 71 of the present invention can be made of metal materials or engineering materials. The specific material is not limited as long as it can adapt to the gas fuel environment. In addition to the above-defined structural features, the structural shapes of other parts are also not limited and can be optimized according to actual needs or manufacturing cost requirements without affecting the implementation of the technical solution of the present invention.

[0074] The present invention provides a specific specimen method, which consists of Figure 1 and Figure 2It can be known that the industrial control computer 15 adjusts the pressure of hydrogen / ammonia gas in the sealed chamber 12 to the target value by controlling the parameters of the flow control valve 5 and combining the value of the pressure gauge 20; by controlling the water level in the humidifier and the heating temperature of the resistive heater 22, and combining with the humidity sensor 8, the humidity of hydrogen / ammonia gas in the sealed chamber 12 is further adjusted; during the test process, the friction force generated during the friction process of the cylinder liner - piston ring friction pair is obtained by collecting the data of the tensile and compressive force sensor 62; the lubricating oil film thickness information during the friction process is obtained by controlling the ultrasonic oscilloscope 39 and the ultrasonic probe 41; the temperature of the cylinder liner - piston ring friction pair is controlled and recorded by controlling the start and stop of the heating power supply 36 and combining with the temperature indication; the reciprocating motion speed of the piston ring fixing device is controlled and recorded by controlling the start and stop and speed of the hydraulic cylinder 14. The loading weight 47 is located at the upper end of the follower 71, and transmits the longitudinal pressure to the piston ring slice specimen 45. Since the driving member 70 and the follower 71 are flexibly connected, the influence of the vertical vibration of the driving member 70 on the friction process can be ignored. At this time, there is no need to add a load sensor, and the gravity of the loading weight 47 is directly equivalent to the load received by the piston ring slice specimen (in fact, the self-weights of the follower 71, the piston ring slice fixture and the piston ring slice need to be added, and this part is a fixed value and does not change).

[0075] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should all be covered by the scope of the claims of the present invention.

Claims

1. An internal combustion engine cylinder liner - piston ring performance verification device for simulating a gas fuel environment, characterized in that including a test platform for conducting performance verification experiments on the cylinder liner - piston ring of an internal combustion engine; a cylinder liner slice fixing device arranged on the test platform for clamping and fixing the cylinder liner slice; a piston ring slice fixing device for clamping the piston ring slice and moving it back and forth on the cylinder liner slice. It includes a reciprocating power device capable of moving back and forth in the horizontal direction and a driving member and a driven member connected by a vertical sliding pair. The driven member is provided with a receiving cavity opening towards the bottom. A piston ring slice fixture is arranged in the receiving cavity. The piston ring slice clamped by the piston ring slice fixture is in relative contact with the cylinder liner slice. The inner side wall of the receiving cavity is provided with a sliding groove allowing the piston ring slice fixture to slide horizontally within a certain range. The side of the piston ring slice fixture is connected to the inner side wall of the sliding groove through a tensile - compression force sensor. A spherical pair restricting its vertical movement is arranged between the top of the piston ring slice fixture and the inner top of the receiving cavity. A weight - placing space for providing the contact normal pressure between the cylinder liner and the piston ring is arranged at the top of the driven member. The reciprocating power device transmits the reciprocating movement power to the piston ring slice through the driving member and the driven member, thereby driving the piston ring slice to reciprocate relative to the cylinder liner slice; a lubricating oil supply device for providing lubricating oil for the relative friction between the piston ring slice and the cylinder liner slice. It includes a lubricating oil tank, a first lubricating oil hole arranged in the driving member, and a second lubricating oil hole arranged in the driven member. The lubricating oil tank is connected to the inlet of the first lubricating oil hole through a lubricating oil hose. The bottom outlet of the first lubricating oil hole is connected to the top of the second lubricating oil hole through a guiding device. The bottom outlet of the second lubricating oil hole is communicated into the receiving cavity; a sealing chamber covering above the test platform, wrapping the cylinder liner slice fixing device, the piston ring slice fixing device and the lubricating oil supply device inside, providing a sealed space required for the gas - fuel environment for the cylinder liner - piston ring performance experiment; a fuel supply device connected to the sealed space formed by the sealing chamber through a pipeline for providing the required type of fuel.

2. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 1, characterized in that: The cylinder liner slice fixing device includes a fixed base and a cylinder liner slice longitudinal clamp and a cylinder liner slice transverse clamp arranged on the fixed base. The fixed base is fixedly installed on the test platform. An arc - shaped groove for accommodating the cylinder liner slice is arranged on the fixed base. The cylinder liner slice longitudinal clamp and the cylinder liner slice transverse clamp limit the cylinder liner slice in the arc - shaped groove in the longitudinal and transverse directions respectively, realizing the clamping of the cylinder liner slice.

3. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 2, characterized in that: The bottom of the fixed base is provided with a heating module capable of heating the cylinder liner slice and an ultrasonic oil film thickness measuring device for detecting the lubricating oil film thickness. The heating module includes a heating groove arranged at the bottom of the fixed base, a heating device arranged in the heating groove, and a heat transfer gasket arranged between the heating groove and the bottom of the arc - shaped groove.

4. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 3, characterized in that: Two grooves are arranged on the test platform below the fixed base. One groove corresponds to the heating groove, together forming a relatively sealed heating cavity. The heating cavity is filled with a heat - conducting medium. The heating device transfers heat to the cylinder liner slice through the heat - conducting medium and the heat transfer gasket. The other groove corresponds to the ultrasonic oil film thickness measuring device, forming a relatively sealed cooling cavity wrapping the ultrasonic oil film thickness measuring device inside. The cooling cavity is filled with a flowing cooling medium.

5. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 3, characterized in that: The reciprocating power device comprises a hydraulic cylinder, a push-pull rod, a roller and a horizontal guide rail, and the horizontal guide rail is installed in the sealing chamber along the movement direction of the cylinder sleeve and the piston ring through a support member; The cylinder body of the hydraulic cylinder is embedded in the side wall of the sealed chamber, the piston rod of the hydraulic cylinder is in the sealed chamber, one end of the push-pull rod is fixedly connected to the piston rod, and the other end is connected to the roller. The roller is installed on the horizontal guide rail, and the horizontal guide rail is used to provide a limit for the rolling direction of the roller, thereby limiting the push-pull rod to push and pull movement in the horizontal direction.

6. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 3, characterized in that: The vertical sliding pair includes a plurality of vertical guide tubes arranged at the top of the follower and a guide column arranged at the bottom of the driving member. The diameter of the guide column is smaller than the vertical guide tube. Each guide column is inserted into a vertical guide tube. Each guide column is provided with a rolling body that cooperates with the inner wall of the vertical guide tube. The rolling body limits the guide column to move within a certain range of up and down directions relative to the vertical guide tube.

7. The performance verification device for the internal combustion engine cylinder liner - piston ring according to claim 6, characterized in that: At least one top of the plurality of vertical guide tubes is connected to the bottom outlet of the first lubricating oil hole through a flexible sealing sleeve, and the bottom of the corresponding vertical guide tube is connected to the top inlet of the second lubricating oil hole, and the vertical guide tube is used as a guide device.

8. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 6, characterized in that: A plurality of vertical guide tubes are symmetrically arranged with the weight placement space as the center.

9. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 6, characterized in that: The heating device comprises a heating power source, a heating wire and an infrared heating tube arranged in a heating tank, and the heating power source is connected to the infrared heating tube through the heating wire for power supply.

10. The internal combustion engine cylinder liner - piston ring performance verification device according to claim 6, characterized in that: The fuel supply device includes a plurality of fuel gas cylinders, a flow control valve and a humidifying device. The plurality of fuel gas cylinders are connected to the flow control valve through pipelines and then connected to the humidifier device. The outlet of the humidifying device is connected to the sealing chamber through an air supply pipeline.

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