Air valve-valve seat multi-wear test device and test method

Abstract

The invention provides an air valve-valve seat multi-wear test device. The air valve-valve seat multi-wear test device comprises a rack, three valve seats, three air valve assemblies, a driving assembly and a loading assembly, the rack is provided with a combustion chamber, and three air valve guide holes are formed in the inner wall of the combustion chamber at intervals; the three valve seats are concentrically arranged at one end of the air valve guide hole and located in the combustion chamber. The three air valve assemblies are arranged on the rack, and each air valve assembly comprises an air valve which is arranged in an air valve guide hole in a sliding mode; the closing unit is arranged on the air valve and is suitable for applying thrust to the air valve, so that the valve head and the valve seat of the air valve are closed; the driving assembly is arranged on the rack and is suitable for driving valve heads of the two air valves to be away from the valve seat, so that the valve heads impact the valve seat under the action of thrust; the loading assembly is movably arranged on the wall face, opposite to the air valve assembly, of the combustion chamber, the loading assembly responds to driving of the driving assembly, the two air valves are extruded and reset, and one of the two air valves is not driven by the driving assembly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of gas valve and valve seat wear testing, and more specifically, to a gas valve-valve seat multiple wear testing device and testing method. Background Art

[0002] The valve-seat is a crucial friction pair in the engine valve train. Its working environment is extremely complex and has a direct impact on the performance and life of the engine. It is generally believed that the main wear mechanisms of the valve-seat are: impact wear caused by the strong impact load generated when the valve is seated; sliding wear caused by the high-temperature and corrosive gas explosion pressure during the combustion process. Wear on the valve surface can cause problems such as valve sinking, cylinder leakage and cylinder pressure drop, which in turn affects the efficiency, fuel economy and service life of the engine.

[0003] In order to deeply understand the laws of valve and seat wear, domestic and foreign researchers have conducted a large number of experimental studies. Most of these studies use whole machine tests, which are cumbersome and time-consuming. At present, there are some bench test devices for valve-seat wear. These devices mainly focus on material properties, dynamic motion laws, and wear mechanisms under different working conditions. These test benches usually consider the impact, high temperature, explosion pressure and other composite effects of the valve, or study impact wear and sliding wear separately.

[0004] However, the existing test equipment is still unable to simultaneously study the impact wear and sliding wear mechanism of the valve-seat under the same environment, as well as the superposition effect of these two wear forms. In order to fully explore the differences and interaction between impact wear and sliding wear, it is urgent to develop a valve-seat test device that can comprehensively study multiple wear forms. Summary of the invention

[0005] In view of this, the present disclosure provides a valve-seat multi-wear test device, which is intended to simulate the same working environment of the engine and conduct a comprehensive study on impact wear, sliding wear and their interaction laws, in order to deeply reveal the nature of these wear mechanisms.

[0006] One aspect of the present disclosure provides a valve-seat multi-wear test device, characterized in that it includes a frame, three valve seats, three valve assemblies, a driving assembly and a loading assembly. The frame is provided with a combustion chamber, and three valve guide holes are arranged at intervals on the inner wall of the combustion chamber; three valve seats are concentrically arranged at one end of the valve guide holes and located in the combustion chamber; three valve assemblies are arranged on the frame, and the valve assemblies include: a valve slidably arranged in the valve guide hole; a closing unit is arranged on the valve, which is suitable for applying thrust to the valve so that the valve head of the valve is closed with the valve seat; a driving assembly is arranged on the frame, which is suitable for driving the valve heads of the two valves away from the valve seat so that the valve heads impact the valve seat under the action of the thrust; and a loading assembly is movably arranged on the wall of the combustion chamber opposite to the valve assembly, and the loading assembly squeezes the two valves and resets them in response to the drive of the driving assembly, wherein one of the two valves has not been driven by the driving assembly.

[0007] According to an embodiment of the present disclosure, the closing unit includes: a first push piece, which is arranged on the valve stem of the air valve; and a first elastic member, which is connected between the first push piece and the frame, so that the elastic force of the first elastic member is converted into the thrust on the air valve.

[0008] According to an embodiment of the present disclosure, the loading assembly includes two loading units, each of which includes: a loading tool movably arranged on the wall of the combustion chamber in the extension direction of the valve guide hole, the loading tool being suitable for squeezing the valve head of the valve and resetting it; and a second elastic member arranged between the loading tool and the frame, the loading tool responding to the elastic force of the second elastic member to reduce the impact on the loading camshaft during resetting.

[0009] According to an embodiment of the present disclosure, the above-mentioned driving assembly includes: a valve camshaft, rotatably arranged on the above-mentioned frame, suitable for driving the above-mentioned valve to move so that the valve head of the above-mentioned valve is away from the valve seat; a loading camshaft, rotatably arranged on the above-mentioned frame, suitable for driving the above-mentioned loading tooling to move toward the valve head of the above-mentioned valve to squeeze the valve head of the above-mentioned valve and then reset it; and a motor, which is transmission-connected to the above-mentioned valve camshaft and the above-mentioned loading camshaft through a transmission unit.

[0010] According to an embodiment of the present disclosure, it also includes an atmosphere component, which includes an atmosphere unit, an atmosphere delivery pipe and an air delivery pipe; wherein the atmosphere unit is suitable for generating a combustion atmosphere and delivering the combustion atmosphere to the combustion chamber through the atmosphere delivery pipe; and delivering high-pressure air to the combustion chamber through the air delivery pipe to recover the combustion atmosphere in the combustion chamber.

[0011] According to an embodiment of the present disclosure, it further includes a plurality of heating units disposed on the frame, and the plurality of heating units are evenly spaced from the three valve seats.

[0012] According to an embodiment of the present disclosure, it also includes a monitoring component, which is arranged in the above-mentioned combustion chamber and is suitable for obtaining the temperature and gas pressure information in the above-mentioned combustion chamber, the valve speed when the above-mentioned valve impacts the above-mentioned valve seat, and the loading pressure of the above-mentioned loading component on the above-mentioned valve.

[0013] Another aspect of the present disclosure provides a test method based on a valve-valve seat multiple wear test device, including: in a simulated environment, driving two valves away from two valve seats respectively, and driving the two valves to impact the two valve seats respectively, and obtaining the valve speeds of the valves when impacting; when the valve heads of the valves are closed to the valve seats, driving the loading assembly to squeeze one of the driven valves and one of the undriven valves, and obtaining the loading pressure during squeezing; disassembling the test device, and obtaining the weights of the valves and the valve seats after the test respectively; observing the microscopic morphologies of the valves and the valve seats, and analyzing the wear mechanism and wear law.

[0014] According to an embodiment of the present disclosure, before the test starts, it also includes delivering a combustion atmosphere to the combustion chamber to simulate the cylinder pressure value when the engine valve is opened; when the pressure in the above-mentioned combustion chamber reaches a preset pressure value, heating the internal environment of the above-mentioned combustion chamber to simulate the temperature of the engine valve during normal combustion; when the temperature in the above-mentioned combustion chamber reaches a preset temperature value, completing the environmental simulation in the above-mentioned combustion chamber and starting the test.

[0015] According to an embodiment of the present disclosure, before the test device is disassembled, the driving assembly and the heating unit are also turned off; when the temperature in the combustion chamber reaches room temperature, high-pressure air is delivered to the combustion chamber to exhaust the combustion atmosphere in the combustion chamber; after the combustion atmosphere in the combustion chamber is exhausted, the test device is disassembled.

[0016] According to the embodiments of the present disclosure, by providing a combustion chamber and a plurality of valve guide holes, and configuring the valve seat and the valve assembly on the frame, the actual working environment of the engine is highly simulated, ensuring a high degree of consistency between the test conditions and the actual working conditions. The device includes three valve seats and valve assemblies, which can simultaneously carry out tests on impact wear, sliding wear and a combination of the two, so that the two wear modes and their interactions can be comprehensively studied. The setting of the drive assembly enables the impact and closure of the valve head to be precisely controlled during the test. At the same time, the movement of the loading assembly can simulate the pressure changes in actual work, improving the accuracy and reliability of the test data. By independently controlling different valve assemblies, the wear of a single valve in the undriven and driven states can be studied separately, which helps to study the differences and superposition effects of impact wear and sliding wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0018] Figure 1 A partial cross-sectional view of a gas valve-valve seat multiple wear test device according to an embodiment of the present disclosure is schematically shown;

[0019] Figure 2 A partial cross-sectional view of a gas valve assembly according to an embodiment of the present disclosure is schematically shown;

[0020] Figure 3 A partial cross-sectional view of a loading assembly according to an embodiment of the present disclosure is schematically shown;

[0021] Figure 4 for Figure 1 An enlarged view of the relative positions of the gas valve assembly and the loading assembly shown in;

[0022] Figure 5 The flowchart of the test method according to the embodiment of the present disclosure is schematically shown.

[0023] In the drawings, the meanings of the reference numerals are as follows:

[0024] 1. Frame;

[0025] 11. Combustion chamber;

[0026] 12. Air valve guide hole;

[0027] 13. A first supporting plate;

[0028] 131, first mounting slot;

[0029] 132, second mounting slot;

[0030] 14. A second supporting plate;

[0031] 15. Support frame;

[0032] 16. A first support rod;

[0033] 17. Second support rod;

[0034] 2. Valve seat;

[0035] 21. Valve seat tooling;

[0036] 3. Air valve assembly;

[0037] 31. Air valve;

[0038] 32. Closed unit;

[0039] 321, first push piece;

[0040] 322, a first elastic member;

[0041] 33. Catheter;

[0042] 4. Drive components;

[0043] 41. Valve camshaft;

[0044] 42. Load the camshaft;

[0045] 43. Motor;

[0046] 44. Transmission unit;

[0047] 441, driving wheel;

[0048] 442. Chain;

[0049] 443, driven wheel;

[0050] 45. Driving parts;

[0051] 5. Load components;

[0052] 51. Loading tooling;

[0053] 511, loading rod;

[0054] 512, loading disk;

[0055] 513, second push piece;

[0056] 52. a second elastic member;

[0057] 6. Atmosphere components;

[0058] 61. Atmosphere unit;

[0059] 62. Atmosphere delivery pipe;

[0060] 63. Air delivery pipe;

[0061] 64. First valve;

[0062] 65. Second valve;

[0063] 7. Heating unit;

[0064] 8. Monitoring components;

[0065] 81. Temperature sensor;

[0066] 82. A first pressure sensor;

[0067] 83. A second pressure sensor; and

[0068] 84. Speed ​​sensor. DETAILED DESCRIPTION

[0069] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0070] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "include", "comprising", etc. used herein indicate the existence of the features, steps, operations and / or mechanisms, but do not exclude the existence or addition of one or more other features, steps, operations or mechanisms.

[0071] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0072] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0073] Figure 1 A partial cross-sectional view of a gas valve-valve seat multiple wear testing device according to an embodiment of the present disclosure is schematically shown.

[0074] The embodiment of the present disclosure provides a valve-seat multi-wear test device, such as Figure 1 As shown, it includes a frame 1, three valve seats 2, three gas valve assemblies 3, a drive assembly 4 and a loading assembly 5. The frame 1 is provided with a combustion chamber 11, and three valve guide holes 12 are arranged at intervals on the inner wall of the combustion chamber 11; three valve seats 2 are concentrically arranged at one end of the valve guide hole 12, and are located in the combustion chamber 11; three valve assemblies 3 are arranged on the frame 1, and the valve assembly 3 includes: a valve 31 and a closing unit 32, and the valve 31 is slidably arranged in the valve guide hole 12; the closing unit 32 is arranged on the valve 31, and is suitable for applying a thrust to the valve 31 so that the valve head of the valve 31 and the valve seat 2 are closed; the driving assembly 4 is arranged on the frame 1, and is suitable for driving the valve heads of the two valves 31 away from the valve seat 2 so that the valve heads impact the valve seat 2 under the action of the thrust; and the loading assembly 5 is movably arranged on the wall surface of the combustion chamber 11 opposite to the valve assembly 3, and the loading assembly 5 responds to the driving of the driving assembly 4 to squeeze the two valves 31 and reset, wherein one of the two valves 31 has not been driven by the driving assembly 4.

[0075] According to the above-mentioned setting mode, by setting the combustion chamber 11 and multiple valve guide holes 12, and configuring the valve seat 2 and the valve assembly 3 on the frame 1, the actual working condition of the engine is simulated. The test device includes three valve seats 2 and corresponding valve assemblies 3. Through the cooperation of the drive assembly 4 and the loading assembly 5, the dynamic behavior of each valve 31 can be independently controlled, and the impact wear, sliding wear and the combined test of the two can be carried out at the same time, so that the two wear modes and their interactions can be comprehensively studied. The setting of the drive assembly 4 enables the impact and closure of the valve head in the test to be accurately controlled. At the same time, the movement of the loading assembly 5 can simulate the pressure changes in actual work, thereby improving the accuracy and reliability of the test data. The test device disclosed in the present invention can study the wear of a single valve 31 in the undriven and driven states respectively by independently controlling different valve assemblies 3, which is helpful to study the difference and superposition effect of impact wear and sliding wear.

[0076] In an illustrative embodiment, Figure 1 As shown, the frame 1 includes a first support plate 13 and a second support plate 14 which are spaced apart from each other. The first support plate 13 and the second support plate 14 are connected by a plurality of support frames 15 and form a receiving space inside. The combustion chamber 11 is formed on the first support plate 13 in the receiving space.

[0077] According to the above-mentioned arrangement, the stability and strength of the frame 1 are enhanced, a fixed installation foundation is provided for the combustion chamber 11, and the overall reliability of the test device and the accuracy of the test results are improved.

[0078] Figure 2 A partial cross-sectional view of a gas valve assembly according to an embodiment of the present disclosure is schematically shown.

[0079] In an illustrative embodiment, Figure 1 and Figure 2 As shown, the valve guide hole 12 is arranged on the first support plate 13 and communicates with the combustion chamber 11. The first support plate 13 is provided with three second mounting grooves 132 on the wall surface of the combustion chamber 11, each second mounting groove 132 is arranged concentrically with the valve guide hole 12, and is suitable for mounting the valve seat tooling 21, wherein the valve seat tooling 21 is suitable for mounting the fixed valve seat 2.

[0080] According to the above-mentioned setting method, by setting the valve guide hole 12 on the first support plate 13 and connecting it to the combustion chamber 11, and the second mounting groove 132 on the first support plate 13 is concentrically set with the valve guide hole 12, it is ensured that the valve assembly 3 can move accurately along the valve guide hole 12. At the same time, the valve seat tooling 21 can accurately cooperate with the valve seat 2 to achieve closure, thereby simulating the actual movement trajectory of the engine valve.

[0081] In an illustrative embodiment, Figure 2 As shown, the closing unit 32 includes a first push piece 321 and a first elastic member 322. The first push piece 321 is arranged on the valve stem of the air valve 31; the first elastic member 322 is connected between the first push piece 321 and the frame 1, so that the elastic force of the first elastic member 322 is converted into a thrust force on the air valve 31.

[0082] According to the above-mentioned setting method, the first push piece 321 is fixed on the valve stem of the air valve 31, and the first elastic member 322 is connected between the first push piece 321 and the frame 1, so that when the first elastic member 322 is compressed, it can apply a thrust to the air valve 31 in the direction of the valve seat 2, thereby achieving the closure of the valve head of the air valve 31 and the valve seat 2.

[0083] In detail, by adjusting the elastic coefficient of the first elastic member 322, the thrust applied to the gas valve 31 can be accurately controlled, thereby simulating different working conditions.

[0084] According to an embodiment of the present disclosure, the first elastic member 322 includes a spring.

[0085] In an illustrative embodiment, Figure 2 As shown, three first mounting grooves 131 are arranged on the wall surface of the first support plate 13 away from the combustion chamber 11 , and each first mounting groove 131 is arranged concentrically with the valve guide hole 12 , and is suitable for installing the first elastic member 322 , wherein the first mounting groove is suitable for accommodating part of the first elastic member 322 .

[0086] According to the above-mentioned arrangement, the first mounting groove 131 is arranged concentrically with the air valve guide hole 12, which helps to maintain the centering of the air valve 31 during movement and reduce the problem of uneven wear caused by eccentricity.

[0087] In an illustrative embodiment, Figure 2 As shown, the air valve assembly 3 also includes a conduit 33, which is slidably mounted on the outside of the valve stem of the air valve 31, wherein the conduit 33 is circumferentially provided with an annular flange, which cooperates with the bottom of the first mounting groove 131, so that the conduit 33 is at least partially disposed in the air valve guide hole 12.

[0088] According to the above-mentioned setting method, the conduit 33 guides the valve stem of the air valve 31 to ensure the linearity and stability of the air valve 31 during movement, and can also reduce the direct contact between the valve stem of the air valve 31 and the inner wall of the air valve guide hole 12 to a certain extent, thereby reducing wear and extending the service life of the test device. At the same time, the setting of the external flange of the conduit 33 helps to improve the sealing performance between the air valve 31 and the air valve guide hole 12, reduce gas leakage, and improve the accuracy of the test.

[0089] In a replaceable embodiment, the first elastic member 322 is connected between the first push piece 321 and the flange of the conduit 33, so that the first elastic member 322 can also apply a thrust to the conduit 33, so that the flange of the conduit 33 always abuts against the bottom of the first mounting groove 131, thereby fixing the conduit 33.

[0090] Figure 3 A partial cross-sectional view of a loading assembly according to an embodiment of the present disclosure is schematically shown.

[0091] In an illustrative embodiment, Figure 3 As shown, the loading assembly 5 includes two loading units, each of which includes a loading fixture 51 and a second elastic member 52. The loading fixture 51 is movably arranged on the wall surface of the combustion chamber 11 in the extension direction of the valve guide hole 12, and the loading fixture 51 squeezes the valve head of the valve 31 in response to the driving of the driving assembly 4, and then resets; the second elastic member 52 is arranged between the loading fixture 51 and the frame 1, and the loading fixture 51 responds to the elastic force of the second elastic member 52 to reduce the impact on the loading camshaft 42 during reset.

[0092] Figure 4 for Figure 1 An enlarged view of the relative positions of the gas valve assembly and the loading assembly is shown in FIG.

[0093] According to the embodiments of the present disclosure, Figure 3 and Figure 4As shown, the loading tooling 51 includes: a loading rod 511, which can be slidably set in a preset mounting hole on the wall of the combustion chamber 11, wherein the mounting hole is concentrically arranged with the valve guide hole; and a loading plate 512, which is installed at one end of the loading rod 511 close to the valve 31 and is suitable for cooperating with the valve head of the valve 31 to squeeze the valve head under the action of the driving assembly.

[0094] In an illustrative embodiment, Figure 3 As shown, the loading tool 51 also includes a second push piece 513, which is installed at one end of the loading rod 511 away from the air valve 31 and is suitable for cooperating with the driving assembly.

[0095] In an illustrative embodiment, Figure 3 As shown, the second elastic member 52 is connected between the loading plate 512 and the wall of the combustion chamber 11 , so that the elastic force of the second elastic member 52 is converted into a buffer for the resetting speed of the loading tooling 5 , thereby alleviating the impact on the loading camshaft 42 .

[0096] In detail, the loading fixture 51 squeezes the valve head of the corresponding air valve 31 under the drive of the driving assembly 4, and then returns to the original position under the action of gravity, etc. During the resetting process, the loading plate 512 squeezes and compresses the second elastic member 52, and under the action of the elastic force of the second elastic member 52, it is ensured that the impact of the loading fixture 51 on the loading camshaft 42 during the resetting process is effectively mitigated.

[0097] In an exemplary embodiment, the second elastic member 52 includes a spring.

[0098] In an illustrative embodiment, Figure 1 As shown, the driving assembly 4 includes a valve camshaft 41, a loading camshaft 42 and a motor 43. The valve camshaft 41 is rotatably arranged on the frame 1, and is suitable for driving the valve 31 to move so that the valve head of the valve 31 is away from the valve seat 2; the loading camshaft 42 is rotatably arranged on the frame 1, and is suitable for driving the loading tool 51 to move toward the valve head of the valve 31 to squeeze the valve head of the valve 31 and then reset; the motor 43 is connected to the valve camshaft 41 and the loading camshaft 42 through the transmission unit 44.

[0099] In an illustrative embodiment, Figure 1 As shown, the transmission unit 44 includes a driving wheel 441, a driven wheel 443 and a chain 442, and the driving wheel 441 and the driven wheel 443 are connected by a chain. The driving wheel 441 is fixedly mounted on the loading camshaft 42, and the driven wheel 443 is fixedly mounted on the valve camshaft 41. The output end of the motor 43 is connected to the driving wheel 441, which is suitable for driving the driving wheel 441 to rotate, so as to indirectly drive the valve camshaft 41 and the loading camshaft 42 to rotate.

[0100] In an alternative embodiment, the driving wheel 441 and the driven wheel 442 are connected by a belt.

[0101] Detailed, such as Figure 1 As shown, at least two second support rods 17 are arranged at intervals on the first support plate 13, and the valve cam shaft 41 is rotatably mounted on the second support rod 17. The cam of the valve cam shaft 41 is suitable for cooperating with the valve stem of the valve 31 to drive the valve 31 to move. At least two first support rods 16 are arranged at intervals on the second support plate 14, and the loading cam shaft 42 is rotatably mounted on the first support rod 16. The cam of the loading cam shaft 42 is suitable for cooperating with the second push piece 513 to drive the loading tooling 51 to move and reset.

[0102] According to an embodiment of the present disclosure, the first valve, the second valve and the third valve are movably mounted on the frame 1, and the valve camshaft 41 is adapted to drive the first valve and the second valve away from the corresponding valve seat 2, and make the first valve and the second valve impact the corresponding valve seat 2 under the action of the closing unit 32. And the first loading fixture and the second loading fixture are movably mounted on the combustion chamber 11 of the frame 1, wherein the first loading fixture is concentrically arranged with the second valve, and the second loading fixture is concentrically arranged with the third valve.

[0103] In an illustrative embodiment, Figure 1 As shown, the driving assembly 4 further includes a driving member 45, which is disposed between the valve stems of the first valve and the second valve and the valve camshaft 41, so that the first valve and the second valve can be driven simultaneously.

[0104] In detail, the driving member 45 includes a first rod abutting between the two valve stem ends and the cam of the valve camshaft 41 , and a second rod orthogonal to the first rod, and the second rod is movably mounted on the frame 1 along the extending direction of the valve guide hole 12 .

[0105] In an illustrative embodiment, Figure 1 As shown, it also includes an atmosphere component 6, which includes an atmosphere unit 61, an atmosphere delivery pipe 62 and an air delivery pipe 63; the atmosphere unit 61 is suitable for generating a combustion atmosphere and delivering the combustion atmosphere to the combustion chamber 11 through the atmosphere delivery pipe 62; the atmosphere unit 61 also delivers high-pressure air to the combustion chamber 11 through the air delivery pipe 63 to recover the combustion atmosphere in the combustion chamber 11.

[0106] According to the above-mentioned setting method, the atmosphere unit 61 is used to generate a combustion atmosphere, and the atmosphere is delivered to the combustion chamber 11 through the atmosphere delivery pipe 62 to simulate the working environment of the actual engine valve; after the test, high-pressure air can also be delivered to the combustion chamber 11 through the air delivery pipe 63 to effectively recover the combustion atmosphere in the combustion chamber 11, thereby reducing gas emissions during the test, which is beneficial to environmental protection and the recycling of test resources.

[0107] According to the embodiments of the present disclosure, Figure 1 As shown, the atmosphere assembly 6 also includes a first valve 64, which is arranged in the atmosphere delivery pipe 62, and a second valve 65, which is arranged in the air delivery pipe. Before the test begins, the first valve 64 is opened to deliver the combustion atmosphere to the combustion chamber 11 through the atmosphere delivery pipe 62; during the test, the first valve 64 and the second valve 65 are closed to ensure the pressure environment in the combustion chamber 11; after the test, the first valve 64 and the second valve 65 are opened to deliver high-pressure air to the combustion chamber 11 through the air delivery pipe 63, so as to discharge the combustion atmosphere in the combustion chamber 11 back to the atmosphere unit 61 through the atmosphere delivery pipe 62 to complete the recovery.

[0108] In an illustrative embodiment, Figure 1 As shown, it also includes a plurality of heating units 7 which are arranged on the frame 1 , and the plurality of heating units 7 are evenly spaced from the three valve seats 2 .

[0109] In detail, four heating units 7 are provided.

[0110] According to the above-mentioned setting method, the four heating units 7 and three valve seats 2 arranged at even intervals can achieve uniform heating of the valve seat 2, which helps to simulate the temperature distribution in the valve seat 2 area when the engine is working, so as to more accurately evaluate the wear of the valve 31 and the valve seat 2 under high temperature conditions.

[0111] In an exemplary embodiment, the heating unit 7 comprises a temperature heater.

[0112] In an illustrative embodiment, Figure 1 As shown, it also includes a monitoring component 8, which is arranged in the combustion chamber 11 and is suitable for obtaining temperature and gas pressure information in the combustion chamber 11, the valve speed when the gas valve 31 impacts the valve seat 2, and the loading pressure of the loading component 5 on the gas valve 31.

[0113] Detailed, such as Figure 1 and Figure 4As shown, the monitoring assembly 8 includes a temperature sensor 81, a first pressure sensor 82, a second pressure sensor 83 and a speed sensor 84. There are three temperature sensors 81, which are respectively arranged in the valve seat tooling 21, and are suitable for monitoring the ambient temperature around the gas valve 31; there are two first pressure sensors 82, which are respectively arranged on the end surface of the loading plate 51 facing the gas valve 31, and are suitable for monitoring the applied pressure when the loading plate 51 squeezes the valve head of the gas valve 31; the second pressure sensor 83 is arranged on the inner wall of the combustion chamber 11, and is suitable for monitoring the ambient pressure in the combustion chamber 11; and the speed sensor 84 is installed on the wall of the combustion chamber 11 opposite to the gas valve assembly 3, and is suitable for monitoring the speed of the gas valve 31 when it impacts the valve seat 2.

[0114] According to an embodiment of the present disclosure, the speed sensor 84 is disposed concentrically with the first gas valve.

[0115] In an illustrative embodiment, the first pressure sensor 82 is a loading pressure sensor, the second pressure sensor 83 is a gas pressure sensor, and the speed sensor 84 is a laser speed sensor.

[0116] Figure 5 The flowchart of the test method according to the embodiment of the present disclosure is schematically shown.

[0117] The embodiment of the present disclosure also provides a test method, using a gas valve-valve seat multi-wear test device, such as Figure 5 As shown, operations S510 to S540 are included.

[0118] In operation S510 , under a simulation environment, the two gas valves 31 are driven to move away from the two valve seats 2 , respectively, and the two gas valves 31 are driven to impact the two valve seats 2 , respectively, and the gas valve speeds of the gas valves 31 when impacting are obtained.

[0119] According to an embodiment of the present disclosure, the valve camshaft 41 is driven to rotate by the motor 43, driving the first valve and the second valve respectively away from the valve seat 2. The first valve and the second valve impact the valve seat 2 under the thrust of the closing unit 32. At this time, the valve speed of the first valve is monitored by the speed sensor 84. Since the first valve and the second valve are driven simultaneously by the driving member 45, the first valve and the second valve have the same speed.

[0120] In operation S520 , when the valve head of the gas valve 31 is closed to the valve seat 2 , the loading assembly 5 is driven to squeeze a driven gas valve 31 and a non-driven gas valve 31 , and the loading pressure during squeezing is obtained.

[0121] According to an embodiment of the present disclosure, when the air valve 31 and the valve seat 2 are closed, the motor 43 drives the loading camshaft 42 to rotate, drives the first loading tooling and the second loading tooling to move, squeezes the second air valve and the third air valve, and monitors the loading pressure through the pressure sensor 82 respectively.

[0122] In operation S530, the test device is disassembled to obtain the weights of the gas valve 31 and the valve seat 2 after the test.

[0123] In operation S540, the microscopic morphologies of the gas valve 31 and the valve seat 2 are observed to analyze the wear mechanism and the wear law.

[0124] According to an embodiment of the present disclosure, before the test starts, operations S511 to S513 are included.

[0125] In operation S511 , before the test, a combustion atmosphere is delivered to the combustion chamber 11 to simulate the in-cylinder pressure value when the engine valve is opened.

[0126] In operation S512, when the pressure in the combustion chamber 11 reaches a preset pressure value, the internal environment of the combustion chamber 11 is heated to simulate the temperature of the engine valve during normal combustion;

[0127] In operation S513, when the temperature in the combustion chamber 11 reaches a preset temperature value, the environmental simulation in the combustion chamber 11 is completed and the test starts.

[0128] According to an embodiment of the present disclosure, before the test device is disassembled, S550 to S570 are also included.

[0129] In operation S550, after the test is finished, the driving assembly 4 and the heating unit 7 are turned off;

[0130] According to an embodiment of the present disclosure, the pressure sensor 82 and the speed sensor 84 are also turned off.

[0131] In operation S560, when the temperature in the combustion chamber 11 reaches room temperature, high-pressure air is delivered into the combustion chamber 11 to exhaust the combustion atmosphere in the combustion chamber 11;

[0132] In operation S570, after the combustion atmosphere in the combustion chamber 11 is exhausted, the test device is disassembled.

[0133] The valve-seat multi-wear test device and test method provided by the present invention can simulate the impact wear, sliding wear and combined wear in the movement of the valve in the same test environment, effectively reduce the impact of environmental and operational errors on the test results, and thus deeply explore the wear mechanism and law of the valve-seat system. At the same time, it can simulate the high temperature and gas atmosphere under actual working conditions, and the gas can be recycled after the test to avoid environmental pollution. In addition, by replacing the valve seat tooling and the guide tube, the device is suitable for valve-seat tests of different sizes, has good reusability, and provides an efficient and environmentally friendly test platform for the research and development and optimization of the valve-seat system.

[0134] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0135] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A valve-seat multi-wear test device, characterized in that: include: A frame (1) is provided with a combustion chamber (11), and three gas valve guide holes (12) are provided at intervals on the inner wall of the combustion chamber (11); Three valve seats (2) are respectively concentrically arranged at one end of the gas valve guide hole (12) and located in the combustion chamber (11); Three gas valve assemblies (3) are arranged on the frame (1), and the gas valve assemblies (3) include: an air valve (31) slidably disposed in the air valve guide hole (12); and A closing unit (32) is arranged on the gas valve (31) and is suitable for applying a thrust to the gas valve (31) so that the valve head of the gas valve (31) and the valve seat (2) are closed; a driving assembly (4), arranged on the frame (1), adapted to drive the valve heads of the two gas valves (31) away from the valve seats (2), so that the valve heads impact the valve seats (2) under the action of the thrust; and A loading assembly (5) is movably disposed on a wall surface of the combustion chamber (11) opposite to the gas valve assembly (3), wherein the loading assembly (5) presses the two gas valves (31) and resets them in response to the driving of the driving assembly (4), wherein one of the two gas valves (31) has not been driven by the driving assembly (4).

2. The valve-seat multiple wear test device according to claim 1, characterized in that: The closing unit (32) comprises: a first push plate (321) disposed on a valve stem of the air valve (31); and The first elastic member (322) is connected between the first push piece (321) and the frame (1), so that the elastic force of the first elastic member (322) is converted into the thrust on the air valve (31).

3. The valve-seat multiple wear test device according to claim 2, characterized in that: The loading assembly (5) comprises two loading units, each of which comprises: a loading tool (51) movably disposed on a wall surface of the combustion chamber (11) in an extension direction of the gas valve guide hole (12), the loading tool (51) being suitable for squeezing the valve head of the gas valve (31) and resetting it; and The second elastic member (52) is arranged between the loading fixture (51) and the frame (1), and the loading fixture (51) mitigates the impact on the loading camshaft (42) in response to the elastic force of the second elastic member (52).

4. The valve-seat multiple wear test device according to claim 3, characterized in that: The driving component (4) comprises: An air valve cam shaft (41) is rotatably disposed on the frame (1) and is suitable for driving the air valve (31) to move so that the valve head of the air valve (31) is away from the valve seat (2); A loading cam shaft (42) is rotatably disposed on the frame (1) and is suitable for driving the loading tool (51) to move toward the valve head of the gas valve (31) so as to squeeze the valve head of the gas valve (31) and reset it; and The motor (43) is transmission-connected to the valve camshaft (41) and the loading camshaft (42) via a transmission unit (44).

5. The valve-seat multiple wear test device according to claim 1, characterized in that: It also includes an atmosphere component (6), wherein the atmosphere component (6) includes an atmosphere unit (61), an atmosphere delivery pipe (62) and an air delivery pipe (63); The atmosphere unit (61) is suitable for generating a combustion atmosphere and delivering the combustion atmosphere to the combustion chamber (11) through the atmosphere delivery pipe (62); and High-pressure air is delivered to the combustion chamber (11) through the air delivery pipe (63) to recover the combustion atmosphere in the combustion chamber (11).

6. The valve-seat multiple wear test device according to claim 1, characterized in that: It also comprises a plurality of heating units (7) which are arranged on the frame (1), and the plurality of heating units (7) are arranged evenly spaced from the three valve seats (2).

7. The valve-seat multiple wear test device according to claim 1, characterized in that: It also includes a monitoring component (8) disposed in the combustion chamber (11) and adapted to obtain information on the temperature and gas pressure in the combustion chamber (11), the speed of the gas valve (31) when the gas valve (31) impacts the valve seat (2), and the loading pressure of the loading component (5) on the gas valve (31).

8. A test method for the valve-seat multiple wear test device according to any one of claims 1 to 7, characterized in that: include: In a simulation environment, the two air valves (31) are driven to move away from the two valve seats (2) respectively, and the two air valves (31) are driven to impact the two valve seats (2) respectively, and the air valve speeds of the air valves (31) when impacting are obtained; When the valve head of the gas valve (31) is closed to the valve seat (2), driving the loading component (5) to squeeze one of the gas valves (31) that has been driven and another of the gas valves (31) that has not been driven, and obtaining the loading pressure during squeezing; Disassembling the test device and obtaining the weights of the gas valve (31) and the valve seat (2) after the test; The microscopic morphologies of the gas valve (31) and the valve seat (2) are observed, and the wear mechanism and wear law are analyzed.

9. The test method according to claim 8, characterized in that Before the trial begins, it also includes: Delivering combustion atmosphere to the combustion chamber (11) to simulate the in-cylinder pressure value when the engine valve is opened; When the pressure in the combustion chamber (11) reaches a preset pressure value, the internal environment of the combustion chamber (11) is heated to simulate the temperature of the engine valve during normal combustion; When the temperature in the combustion chamber (11) reaches a preset temperature value, the environmental simulation in the combustion chamber (11) is completed and the test begins.

10. The test method according to claim 9, characterized in that: Before disassembling the test device, the method further includes: Turn off the drive assembly (4) and the heating unit (7); When the temperature in the combustion chamber (11) reaches room temperature, high-pressure air is delivered into the combustion chamber (11) to exhaust the combustion atmosphere in the combustion chamber (11); After the combustion atmosphere in the combustion chamber (11) is exhausted, the test device is disassembled.

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