Air valve-valve seat multi-wear test device

Abstract

The utility model 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 at least one embodiment of the utility model relates to the friction pair of valve and valve seat wear test technical field, more specifically, relate to a kind of valve-valve seat multi-wear test device. BACKGROUND

[0002] Valve-valve seat is the friction pair of engine valve mechanism, its working environment is extremely complex, and has direct influence on the performance and life of engine.It is generally believed that the main wear mechanism of valve-valve seat is: impact wear caused by strong impact load generated when valve seats;sliding wear caused by high temperature and corrosive gas burst pressure in combustion process.The wear on the surface of valve can lead to problems such as valve subsidence, cylinder leakage and cylinder pressure drop, and thus affect the efficiency, fuel economy and service life of engine.

[0003] In order to deeply understand the law of valve and valve seat wear, domestic and foreign researchers have carried out a large number of experimental researches, and these researches mostly use whole machine test, which is cumbersome and time-consuming.At present, there are some bench test devices for valve-valve seat wear, and these devices mainly focus on material properties, dynamic motion law, and wear mechanism research under different working conditions.These test benches usually consider the multiple effects of valve under impact, high temperature, burst pressure, or separately study impact wear and sliding wear.

[0004] However, the existing test device cannot simultaneously study the mechanism of impact wear and sliding wear of valve-valve seat and the superposition effect of these two forms of wear in the same environment.In order to comprehensively explore the differences and interaction laws of impact wear and sliding wear, it is urgent to develop a valve-valve seat test device that can comprehensively study multiple forms of wear. UTILITY MODEL CONTENT

[0005] Therefore, the utility model provides a kind of valve-valve seat multi-wear test device, which aims to simulate the same environment of engine working, and comprehensively study the impact wear, sliding wear and their interaction laws, in order to deeply reveal the nature of these wear mechanisms.

[0006] The utility model discloses an aspect provides a kind of gas valve-valve seat multi-wear test device, it is characterized by, including rack, three valve seats, three gas valve assemblies, drive assembly and loading assembly.Rack is provided with combustion chamber, the inner wall of above-mentioned combustion chamber is intervally provided with three gas valve guide holes;Three valve seats are concentrically arranged at one end of above-mentioned gas valve guide hole respectively, and located in above-mentioned combustion chamber;Three gas valve assemblies are arranged on above-mentioned rack, above-mentioned gas valve assembly includes: gas valve, is slidably arranged in above-mentioned gas valve guide hole;Closure unit, it is arranged on above-mentioned gas valve, suitable for exerting thrust to above-mentioned gas valve, make the valve head of above-mentioned gas valve and above-mentioned valve seat close;Drive assembly is arranged on above-mentioned rack, suitable for driving the valve head of two above-mentioned gas valve away from above-mentioned valve seat, make above-mentioned valve head impact above-mentioned valve seat under the action of above-mentioned thrust;And loading assembly is movably arranged on the wall surface of above-mentioned combustion chamber and above-mentioned gas valve assembly opposite, above-mentioned loading assembly responds to the drive of above-mentioned drive assembly, extrudes two above-mentioned gas valve and resets, wherein, one of two above-mentioned gas valve is not driven by above-mentioned drive assembly.

[0007] According to the embodiment of the utility model, the closure unit includes: a first push piece arranged on the valve stem of the gas valve; and a first elastic member connected between the first push piece and the rack, so that the elastic force of the first elastic member is converted into the thrust on the gas valve.

[0008] According to the embodiment of the utility model, the loading assembly includes two loading units, and each loading unit includes: a loading tool movably arranged on the wall surface of the combustion chamber in the extension direction of the gas valve guide hole, the loading tool being suitable for extruding the valve head of the gas valve and resetting; and a second elastic member arranged between the loading tool and the rack, the loading tool being suitable for reducing the impact on the loading camshaft during resetting in response to the elastic force of the second elastic member.

[0009] According to the embodiment of the utility model, the loading tool includes: a loading rod slidably arranged in a pre-set mounting hole on the wall surface of the combustion chamber, wherein the mounting hole is concentrically arranged with the gas valve guide hole; a loading disc installed at one end of the loading rod close to the gas valve, suitable for cooperating with the valve head of the gas valve and extruding the valve head under the action of the drive assembly; and a second push piece installed at one end of the loading rod away from the gas valve, suitable for cooperating with the drive assembly.

[0010] According to the embodiment of the utility model, the above-mentioned driving assembly comprises: a gas valve camshaft rotatably arranged on the above-mentioned rack, suitable for driving the above-mentioned gas valve to move, making the valve head of the above-mentioned gas valve away from the above-mentioned valve seat; a loading camshaft rotatably arranged on the above-mentioned rack, suitable for driving the above-mentioned loading tool to move towards the valve head of the above-mentioned gas valve to extrude the valve head of the above-mentioned gas valve, and then reset; and a motor, which is in transmission connection with the above-mentioned gas valve camshaft and the above-mentioned loading camshaft through a transmission unit.

[0011] According to the embodiment of the utility model, it further comprises an atmosphere assembly, the above-mentioned atmosphere assembly comprises an atmosphere unit, an atmosphere delivery pipe and an air delivery pipe; wherein the above-mentioned atmosphere unit is suitable for generating a combustion atmosphere, and delivering the combustion atmosphere to the above-mentioned combustion chamber through the above-mentioned atmosphere delivery pipe; and delivering high-pressure air into the above-mentioned combustion chamber through the above-mentioned air delivery pipe to recover the above-mentioned combustion atmosphere in the above-mentioned combustion chamber.

[0012] According to the embodiment of the utility model, the above-mentioned atmosphere assembly further comprises: a first valve arranged in the above-mentioned atmosphere delivery pipe; and a second valve arranged in the above-mentioned air delivery pipe.

[0013] According to the embodiment of the utility model, it further comprises a plurality of heating units arranged on the above-mentioned rack, and the plurality of above-mentioned heating units are arranged uniformly and spaced apart from the three above-mentioned valve seats.

[0014] According to the embodiment of the utility model, it further comprises a monitoring assembly arranged in the above-mentioned combustion chamber, suitable for acquiring the temperature and gas pressure information in the above-mentioned combustion chamber, the gas valve speed when the above-mentioned gas valve impacts the above-mentioned valve seat and the loading pressure of the above-mentioned loading assembly on the above-mentioned gas valve.

[0015] According to the embodiment of the utility model, the above-mentioned monitoring assembly comprises a temperature sensor, a first pressure sensor, a second pressure sensor and a speed sensor.

[0016] According to the embodiment of the utility model, by arranging the combustion chamber and a plurality of gas valve guide holes, and arranging the valve seat and the gas valve assembly on the rack, the actual working environment of the engine is highly simulated, and the high consistency of the test conditions and the actual working conditions is ensured. The device contains three valve seats and gas valve assemblies, which can simultaneously perform impact wear, sliding wear and comprehensive test of the two, so as to comprehensively study the two wear modes and their interaction. The arrangement of the driving assembly can accurately control the impact and closing of the valve head in the test, at the same time, the movement of the loading assembly can simulate the pressure change in the actual work, and the accuracy and reliability of the test data are improved. Through independent control of different gas valve assemblies, the wear conditions of a single gas valve in the undriven and driven states can be studied respectively, which is helpful to study the difference and superposition effect of impact wear and sliding wear. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 1 schematically shows a partial cross-sectional view of a gas valve-valve seat multi-wear test device according to an embodiment of the present application;

[0019] Figure 2 schematically shows a partial cross-sectional view of a gas valve assembly according to an embodiment of the present application;

[0020] Figure 3 schematically shows a partial cross-sectional view of a loading assembly according to an embodiment of the present application;

[0021] Figure 4 is Figure 1 an enlarged view of relative positions of the gas valve assembly and the loading assembly shown in FIG. 1.

[0022] In the drawings, the meanings of the reference numerals are as follows:

[0023] 1. a frame;

[0024] 11. a combustion chamber;

[0025] 12. a gas valve guide hole;

[0026] 13. a first support plate;

[0027] 131. a first mounting groove;

[0028] 132. a second mounting groove;

[0029] 14. a second support plate;

[0030] 15. a support frame;

[0031] 16. a first support rod;

[0032] 17. a second support rod;

[0033] 2. a valve seat;

[0034] 21. a valve seat tooling;

[0035] 3. a gas valve assembly;

[0036] 31. a gas valve;

[0037] 32. a closing unit;

[0038] 321. a first push piece;

[0039] 322. a first elastic member;

[0040] 33. a guide pipe;

[0041] 4. a driving assembly;

[0042] 41. a camshaft of air valve;

[0043] 42. a camshaft of loading;

[0044] 43. a motor;

[0045] 44. a transmission unit;

[0046] 441. a driving wheel;

[0047] 442. a chain;

[0048] 443. a driven wheel;

[0049] 45. a driving member;

[0050] 5. a loading assembly;

[0051] 51. a loading tool;

[0052] 511. a loading rod;

[0053] 512. a loading disc;

[0054] 513. a second push piece;

[0055] 52. a second elastic member;

[0056] 6. an atmosphere assembly;

[0057] 61. an atmosphere unit;

[0058] 62. an atmosphere delivery pipe;

[0059] 63. an air delivery pipe;

[0060] 64. a first valve;

[0061] 65. a second valve;

[0062] 7. a heating unit;

[0063] 8. a monitoring assembly;

[0064] 81. a temperature sensor;

[0065] 82. a first pressure sensor;

[0066] 83. a second pressure sensor; and

[0067] 84. a speed sensor. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical scheme and advantages of the utility model clearer and more comprehensible, the following will make further detailed description of the utility model in combination with specific embodiments and with reference to the drawings.

[0069] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "includes" and tautological expressions thereof, means the stated features, steps, operations and / or components are present, but does not preclude the presence or addition of one or more other features, steps, operations or components.

[0070] All terms used herein, including technical and scientific terms, have the meaning commonly understood by one of ordinary skill in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of the specification, and should not be interpreted in an idealized or overly formal manner.

[0071] In the case of using expressions such as "at least one of A, B, and C", it will generally be understood that the expression is intended to mean any of the individual members of the set A, B, and C, as well as any combination of the individual members thereof. In the case of using expressions such as "at least one of A, B, or C", it will generally be understood that the expression is intended to mean any of the individual members of the set A, B, and C, as well as any combination of the individual members thereof.

[0072] It should also be noted that the directional phrases mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", etc., are only reference directions of the drawings, and are not intended to limit the protection scope of the utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. When it may cause confusion in understanding the utility model, the conventional structure or configuration will be omitted.

[0073] Figure 1 A partial cross-sectional view of a valve seat multi-wear test device according to an embodiment of the utility model is schematically shown.

[0074] The embodiments of the utility model provide a valve seat multi-wear test device, such as Figure 1As shown, it comprises a frame 1, three valve seats 2, three valve assemblies 3, a driving 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 on the inner wall of the combustion chamber 11 at intervals; the three valve seats 2 are arranged concentrically at one end of the valve guide holes 12 and are located in the combustion chamber 11; the three valve assemblies 3 are arranged on the frame 1, and each valve assembly 3 comprises a valve 31 and a closing unit 32, the valve 31 is slidably arranged in the valve guide hole 12, and the closing unit 32 is arranged on the valve 31 and is suitable for applying a pushing force to the valve 31 so that the valve head of the valve 31 is closed with the valve seat 2; the driving assembly 4 is arranged on the frame 1 and is suitable for driving the valve heads of two valves 31 away from the valve seats 2 so that the valve heads impact the valve seats 2 under the action of the pushing force; and the loading assembly 5 is movably arranged on the wall surface of the combustion chamber 11 opposite to the valve assembly 3, the loading assembly 5 is pressed against the two valves 31 in response to the driving of the driving assembly 4 and is reset, wherein one of the two valves 31 is not driven by the driving assembly 4.

[0075] According to the above arrangement mode, the actual working condition of the engine is simulated by arranging the combustion chamber 11 and the plurality of valve guide holes 12 and arranging the valve seat 2 and the valve assembly 3 on the frame 1. The test device contains three valve seats 2 and corresponding valve assemblies 3, and the dynamic behavior of each valve 31 can be independently controlled through the cooperation of the driving assembly 4 and the loading assembly 5, the impact wear, sliding wear and comprehensive test of the two can be carried out at the same time, so that the two kinds of wear modes and their interaction can be comprehensively studied. The arrangement of the driving assembly 4 enables the impact and closing of the valve head to be accurately controlled in the test, and at the same time, the movement of the loading assembly 5 can simulate the pressure change in the actual work, thereby improving the accuracy and reliability of the test data. The test device of the utility model can study the wear conditions of a single valve 31 in the undriven and driven states respectively through independent control of different valve assemblies 3, which is helpful to study the difference and superposition effect of impact wear and sliding wear.

[0076] In an exemplary embodiment, as shown in Figure 1 The frame 1 comprises a first support plate 13 and a second support plate 14 arranged at intervals, the first support plate 13 and the second support plate 14 are connected through a plurality of support frames 15 and form an accommodating space inside, and the combustion chamber 11 is formed on the first support plate 13 in the accommodating space.

[0077] According to the above arrangement mode, the stability and strength of the frame 1 are enhanced, a fixed installation basis 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 An exemplary partial cross-sectional view of a valve assembly according to an embodiment of the utility model is shown.

[0079] In an illustrative embodiment, as shown in Figure 1 and Figure 2 illustrated, the gas 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 of which is concentrically arranged with the gas 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 arrangement, by arranging the gas valve guide hole 12 on the first support plate 13 and communicating with the combustion chamber 11, and the second mounting groove 132 on the first support plate 13 is concentrically arranged with the gas valve guide hole 12, it is ensured that the gas valve assembly 3 can move accurately along the gas valve guide hole 12, and at the same time, the valve seat tooling 21 can be accurately matched with the valve seat 2 to realize closing, thereby simulating the actual motion trajectory of the engine valve.

[0081] In an illustrative embodiment, as shown in Figure 2 illustrated, 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 rod of the gas valve 31; the first elastic member 322 is connected between the first push piece 321 and the rack 1, so that the elastic force of the first elastic member 322 is converted into a pushing force on the gas valve 31.

[0082] According to the above arrangement, the first push piece 321 is fixed on the valve rod of the gas valve 31, and the first elastic member 322 is connected between the first push piece 321 and the rack 1, so that when the first elastic member 322 is compressed, it can exert a pushing force on the gas valve 31 in the direction of the valve seat 2, thereby realizing the closing of the valve head of the gas valve 31 and the valve seat 2.

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

[0084] According to the embodiment of the utility model, the first elastic member 322 includes a spring.

[0085] In an illustrative embodiment, as shown in Figure 2 illustrated, the first support plate 13 is provided with three first mounting grooves 131 away from the wall surface of the combustion chamber 11, each of which is concentrically arranged with the gas valve guide hole 12 and is suitable for mounting 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 arrangement, the first mounting groove 131 is concentrically arranged with the gas valve guide hole 12, which helps to maintain the centration of the gas 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. It 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 an alternative 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 invention is schematically shown.

[0091] In an illustrative embodiment, Figure 3 As shown, the loading assembly 5 comprises two loading units, each of which includes a loading fixture 51 and a second elastic member 52. The loading fixture 51 is movably mounted on the wall of the combustion chamber 11 in the direction of the valve guide hole 12. In response to actuation by the drive assembly 4, the loading fixture 51 squeezes the valve head of the valve 31 and then resets it. The second elastic member 52 is positioned between the loading fixture 51 and the frame 1. The elastic force of the second elastic member 52 mitigates the impact of the loading fixture 51 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 embodiment of the present utility model, Figure 3 and Figure 4 As 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 exemplary embodiment, as shown in Figure 3 the loading tool 51 further comprises a second push piece 513, which is installed at the end of the loading rod 511 away from the air valve 31, and is adapted to cooperate with the driving assembly.

[0095] In an exemplary embodiment, as shown in Figure 3 the second elastic member 52 is connected between the loading disc 512 and the wall surface of the combustion chamber 11, so that the elastic force of the second elastic member 52 is converted into buffering of the reset speed of the loading tool 5, and the impact on the loading camshaft 42 is slowed down.

[0096] In detail, the loading tool 51 is pressed against the valve head of the corresponding air valve 31 under the driving of the driving assembly 4, and then returns to the original position under the action of gravity. In the process of returning, the loading disc 512 presses and compresses the second elastic member 52, and under the action of the elastic force of the second elastic member 52, the impact of the loading tool 51 on the loading camshaft 42 in the process of returning is effectively slowed down.

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

[0098] In an exemplary embodiment, as shown in Figure 1 the driving assembly 4 comprises an air valve camshaft 41, a loading camshaft 42 and a motor 43. The air valve camshaft 41 is rotatably arranged on the frame 1, and is adapted to drive the air valve 31 to move, so that the valve head of the air valve 31 is away from the valve seat 2; the loading camshaft 42 is rotatably arranged on the frame 1, and is adapted to drive the loading tool 51 to move towards the valve head of the air valve 31, so as to press the valve head of the air valve 31, and then reset; the motor 43 is in driving connection with the air valve camshaft 41 and the loading camshaft 42 through a transmission unit 44.

[0099] In an exemplary embodiment, as shown in Figure 1 the transmission unit 44 comprises 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 the chain. Among them, the driving wheel 441 is fixedly installed on the loading camshaft 42, and the driven wheel 443 is fixedly installed on the air valve camshaft 41. The output end of the motor 43 is connected with the driving wheel 441, which is adapted to drive the driving wheel 441 to rotate, so as to indirectly drive the air 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] In detail, as shown in Figure 1As shown, at least two second support rods 17 are arranged on the first support plate 13 at intervals, and the air valve camshaft 41 is rotatably installed on the second support rod 17, and the cam of the air valve camshaft 41 is suitable for cooperating with the valve rod of the air valve 31 to drive the air valve 31 to move.

[0102] According to the embodiment of the utility model, the first air valve, the second air valve and the third air valve are movably installed on the rack 1, the air valve camshaft 41 is suitable for driving the first air valve and the second air valve to move away from the corresponding valve seat 2, and the first air valve and the second air valve impact the corresponding valve seat 2 under the action of the closing unit 32.

[0103] In an illustrative embodiment, as shown in Figure 1 The driving assembly 4 further includes a driving piece 45 arranged between the valve rods of the first air valve and the second air valve and the air valve camshaft 41, so that the first air valve and the second air valve can be driven simultaneously.

[0104] In detail, the driving piece 45 includes a first rod abutting between the two valve rod end portions and the cam of the air valve camshaft 41, and a second rod orthogonal to the first rod, and the second rod is movably installed on the rack 1 along the extension direction of the air valve guide hole 12.

[0105] In an illustrative embodiment, as shown in Figure 1 Further including an atmosphere assembly 6, the atmosphere assembly 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; the atmosphere unit 61 also delivers high-pressure air into 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 arrangement, the combustion atmosphere is generated by the atmosphere unit 61 and delivered to the combustion chamber 11 through the atmosphere delivery pipe 62 to simulate the working environment of the air valve of the actual engine; after the test is completed, high-pressure air can also be delivered into the combustion chamber 11 through the air delivery pipe 63, effectively recovering the combustion atmosphere in the combustion chamber 11, reducing gas emission during the test, and being conducive to environmental protection and recycling of test resources.

[0107] According to the embodiment of the utility model, as shown in Figure 1As shown, the atmosphere assembly 6 further comprises a first valve 64 arranged in the atmosphere delivery pipe 62 and a second valve 65 arranged in the air delivery pipe. Before the test starts, the first valve 64 is opened to deliver the combustion atmosphere into 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 ends, the first valve 64 and the second valve 65 are opened to deliver the high-pressure air into the combustion chamber 11 through the air delivery pipe 63 to complete the recovery of the combustion atmosphere in the combustion chamber 11 through the atmosphere delivery pipe 62.

[0108] In an exemplary embodiment, as shown in Figure 1 The heating assembly 7 is arranged on the frame 1 and is uniformly spaced apart from the three valve seats 2.

[0109] In detail, the heating assembly 7 is provided with four.

[0110] According to the above arrangement, the four heating assemblies 7 uniformly spaced apart from the three valve seats 2 can realize uniform heating of the valve seats 2, which helps to simulate the temperature distribution of the valve seat 2 region during engine operation, so as to more accurately evaluate the wear condition of the valve 31 and the valve seat 2 under high temperature condition.

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

[0112] In an exemplary embodiment, as shown in Figure 1 The monitoring assembly 8 is arranged in the combustion chamber 11 and is adapted to acquire the temperature and gas pressure information in the combustion chamber 11, the valve speed when the valve 31 impacts the valve seat 2, and the loading pressure of the loading assembly 5 on the valve 31.

[0113] In detail, as shown in Figure 1 and Figure 4 The monitoring assembly 8 comprises a temperature sensor 81, a first pressure sensor 82, a second pressure sensor 83, and a speed sensor 84. The temperature sensor 81 has three, which are arranged in the valve seat tooling 21 and are adapted to monitor the ambient temperature around the valve 31; the first pressure sensor 82 has two, which are arranged on the end face of the loading disc 51 facing the valve 31 and are adapted to monitor the pressure applied when the loading disc 51 extrudes the valve head of the valve 31; the second pressure sensor 83 is arranged on the inner side wall of the combustion chamber 11 and is adapted to monitor the ambient pressure in the combustion chamber 11; and the speed sensor 84 is installed on the wall surface of the combustion chamber 11 opposite to the valve assembly 3 and is adapted to monitor the speed when the valve 31 impacts the valve seat 2.

[0114] According to the embodiment of the present application, the speed sensor 84 is arranged concentrically with the first valve.

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

[0116] In an illustrative embodiment, 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. When the pressure in the combustion chamber 11 reaches the preset pressure value, the environment inside 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 the preset temperature value, the environment simulation in the combustion chamber 11 is completed.

[0117] In detail, the motor 43 drives the valve camshaft 41 to rotate, and drives the first valve and the second valve to move 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.

[0118] Further, in the case where the valve 31 and the valve seat 2 are closed, the motor 43 drives the load camshaft 42 to rotate, drives the first load tooling and the second load tooling to move, and extrudes the second valve and the third valve. The load pressure is monitored by the pressure sensor 82.

[0119] In an illustrative embodiment, the test device is also disassembled, the weights of the tested valve 31 and the valve seat 2 are obtained respectively, and the micro-morphology of the valve 31 and the valve seat 2 is observed to analyze the wear mechanism and wear law.

[0120] In detail, after the test is completed, the driving assembly 4, the heating unit 7, the pressure sensor 82, and the speed sensor 84 are turned off. When the temperature in the combustion chamber 11 reaches room temperature, high-pressure air is delivered to the combustion chamber 11 to discharge the combustion atmosphere in the combustion chamber 11; after the combustion atmosphere in the combustion chamber 11 is discharged, the test device is disassembled.

[0121] The valve seat multi-wear test device and the test method can simulate impact wear, sliding wear and comprehensive wear in valve movement in the same test environment, effectively reduce the influence of environment and operation error on test results, and in-depth explore the wear mechanism and law of the valve seat system. Meanwhile, high temperature and gas atmosphere under actual working conditions can be simulated, and the gas can be recycled after the test, so as to avoid environmental pollution. In addition, the device is suitable for valve seat tests of different sizes by replacing the valve seat tooling and the conduit, has good reusability, and provides an efficient and environmentally-friendly test platform for research and optimization of the valve seat system.

[0122] The embodiments of the utility model are described above. However, these embodiments are only for the purpose of illustration, and not for limiting the scope of the utility model. Although each embodiment is described above respectively, this does not mean that the measures in each embodiment cannot be used advantageously in combination. The scope of the utility model is defined by the appended claims and their equivalents. Without departing from the scope of the utility model, various alternatives and modifications can be made by those skilled in the art, and all these alternatives and modifications shall fall within the scope of the utility model.

Claims

1. A valve seat and valve wear testing apparatus characterized by, The application relates to a three-valve assembly of a gas engine, which comprises: a frame (1) provided with a combustion chamber (11), wherein three gas valve guide holes (12) are arranged on the inner wall of the combustion chamber (11) at intervals; three valve seats (2) arranged at one end of the gas valve guide holes (12) and located in the combustion chamber (11) in a concentric manner; three gas valve assemblies (3) arranged on the frame (1), wherein each gas valve assembly (3) comprises: a gas valve (31) slidably arranged in the gas valve guide hole (12); and a closing unit (32) arranged on the gas valve (31) and adapted to apply a pushing force to the gas valve (31) so that the valve head of the gas valve (31) is closed to the valve seat (2); a driving assembly (4) arranged on the frame (1) and adapted to drive the valve heads of two gas valves (31) to move away from the valve seats (2) so that the valve heads impact the valve seats (2) under the action of the pushing force; and a loading assembly (5) movably arranged on the wall surface of the combustion chamber (11) opposite to the gas valve assembly (3), wherein the loading assembly (5) is driven by the driving assembly (4) to press and reset two gas valves (31), and one of the two gas valves (31) is not driven by the driving assembly (4).

2. The multi-wear testing apparatus for a valve-seat of claim 1, wherein, The closing unit (32) comprises: a first push piece (321) arranged on the valve rod of the gas valve (31); and a first elastic member (322) 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 pushing force applied to the gas valve (31).

3. The multi-wear testing apparatus for a valve-seat of claim 2, wherein, The loading assembly (5) comprises two loading units, and each loading unit comprises: a loading tool (51) movably arranged on the wall surface of the combustion chamber (11) in the extension direction of the gas valve guide hole (12), wherein the loading tool (51) is adapted to press and reset the valve head of the gas valve (31); and a second elastic member (52) arranged between the loading tool (51) and the frame (1), wherein the loading tool (51) is adapted to slow down the impact on a loading camshaft (42) in response to the elastic force of the second elastic member (52).

4. The multi-wear testing apparatus for a valve-seat of claim 3, wherein, The loading tool (51) comprises: a loading rod (511) slidably arranged in a preset mounting hole in the wall surface of the combustion chamber (11), wherein the mounting hole is arranged concentrically with the gas valve guide hole (12); a loading disc (512) mounted on one end of the loading rod (511) close to the gas valve (31) and adapted to cooperate with the valve head of the gas valve (31) to press the valve head under the action of the driving assembly (4); and a second push piece (513) mounted on one end of the loading rod (511) away from the gas valve (31) and adapted to cooperate with the driving assembly (4).

5. The valve seat and valve face multi- wear testing apparatus of claim 3 wherein, The driving assembly (4) comprises: a gas valve camshaft (41) rotatably arranged on the frame (1) and adapted to drive the gas valve (31) to move away from the valve seat (2). A loading camshaft (42) is rotatably arranged on the frame (1) and is adapted to drive the loading tool (51) to move towards the valve head of the air valve (31) to press the valve head of the air valve (31) and then reset. A motor (43) is drivingly connected with the air valve camshaft (41) and the loading camshaft (42) through a transmission unit (44).

6. The valve seat and valve face multi- wear testing apparatus of claim 1 wherein, An atmosphere assembly (6) is further included, which comprises an atmosphere unit (61), an atmosphere delivery pipe (62) and an air delivery pipe (63). The atmosphere unit (61) is adapted to generate a combustion atmosphere and deliver the combustion atmosphere to the combustion chamber (11) through the atmosphere delivery pipe (62). High-pressure air is delivered into the combustion chamber (11) through the air delivery pipe (63) to recover the combustion atmosphere in the combustion chamber (11).

7. The multi-wear testing apparatus for a valve-seat of claim 6, wherein, The atmosphere assembly (6) further comprises: A first valve (64) arranged in the atmosphere delivery pipe (62); and A second valve (65) arranged in the air delivery pipe (63).

8. The multi-wear testing apparatus for a valve-seat of claim 6, wherein, A plurality of heating units (7) are arranged on the frame (1) and are evenly spaced apart from the three valve seats (2).

9. The valve seat and valve face multi- wear testing apparatus of claim 1 wherein, A monitoring assembly (8) is arranged in the combustion chamber (11) and is adapted to acquire the temperature and gas pressure information in the combustion chamber (11), the air valve speed when the air valve (31) impacts the valve seat (2) and the loading pressure of the loading assembly (5) on the air valve (31).

10. The valve seat and valve face multi-wear testing apparatus of claim 9 wherein, The monitoring assembly (8) comprises a temperature sensor (81), a first pressure sensor (82), a second pressure sensor (83) and a speed sensor (84).

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