A test device for diesel engine repair with working condition simulation function

Abstract

The application discloses a kind of diesel engine maintenance test device with working condition simulation function, it is related to the technical field of dynamometer, test device includes test bench and coupling, the engine to be measured is installed on test bench, the output end of engine is drivingly connected with coupling, the side of coupling is equipped with hydraulic dynamometer, hydraulic dynamometer includes base, water inlet component, water outlet component, body component and dynamometer component, base is tightly connected with test bench, water inlet component and water outlet component are connected with body component, dynamometer component is connected with base, and dynamometer component is used to detect the power of engine;Test bench is fixed on ground to provide stable support for test device, the engine to be measured is installed on test bench, and the engine to be measured is diesel engine, after diesel engine is disassembled and maintained, it needs to be tested and accepted according to acceptance specification, to ensure that diesel engine after maintenance is qualified, generally, the output power of diesel engine is detected by hydraulic dynamometer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dynamometer technology, and particularly relates to a diesel engine maintenance test device with working condition simulation function. BACKGROUND

[0002] In the field of diesel engine maintenance, performance acceptance after maintenance is crucial, and key indicators such as output power need to be verified through load testing according to specifications. Traditional testing generally uses a hydraulic dynamometer as a load device. Its principle is that the rotor rotates in a closed water cavity, and the water flow friction resistance absorbs the mechanical energy of the diesel engine and converts it into heat energy. At the same time, the power is calculated by measuring the reaction torque on the shell. However, the existing technology has some shortcomings.

[0003] Insufficient measurement reliability: only relying on a single brake arm sensor to detect braking torque, long-term high-load operation can easily lead to data drift due to mechanical wear or external interference, making it difficult to meet the high-precision requirements of maintenance acceptance.

[0004] Weak temperature control capability: continuous friction between water flow and rotor generates a large amount of heat energy, although it relies on water circulation for heat dissipation, but the water temperature still rises sharply with load and time. When the water temperature exceeds the critical value, cavitation phenomenon is easy to occur, which not only reduces the test accuracy, but also may damage the dynamometer rotor and cavity structure. SUMMARY

[0005] The purpose of the present application is to provide a diesel engine maintenance test device with working condition simulation function to solve the problems in the prior art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: the test device comprises a test bench and a coupling, a tested engine is installed on the test bench, the output end of the engine is in transmission connection with the coupling, one side of the coupling is provided with a hydraulic dynamometer, the hydraulic dynamometer comprises a base, a water inlet component, a water outlet component, a machine body component and a dynamometer component, the base is in fastening connection with the test bench, the water inlet component and the water outlet component are connected with the machine body component, the dynamometer component is connected with the base, and the dynamometer component is used for detecting the power of the engine.

[0007] The test bench is fixed on the ground to provide stable support for the test device, and the measured engine is installed on the test bench. The measured engine is a diesel engine. After being disassembled and repaired, the diesel engine needs to be tested and accepted according to the acceptance specification, so as to ensure that the repaired diesel engine is qualified. Generally, the output power of the diesel engine is detected by a hydraulic dynamometer. Before detection, it is necessary to ensure that the oil level of the diesel engine is qualified, and the diesel engine is connected to the corresponding oil circuit and circuit. Then start the diesel engine. The power of the diesel engine is transmitted to the hydraulic dynamometer through the shaft coupling. The hydraulic dynamometer absorbs mechanical energy through the interaction of water and rotating parts based on the principle of liquid resistance and converts it into heat energy. At the same time, the power calculation is realized by measuring the reaction torque. The water inlet part and the water outlet part provide water source for the machine body part. The machine body part is the main part of the dynamometer which uses water to absorb the effective torque of the power machine. The mechanical energy output by the diesel engine is converted into heat energy here. The reaction force generated by the machine body part is detected by the dynamometer part. The detection result is the real-time power of the diesel engine.

[0008] Further, the water inlet part and the water outlet part are connected with a water supply tank. The water inlet part and the water outlet part are provided with adjusting valves. The adjusting valves are used to adjust the load of the hydraulic dynamometer.

[0009] The water inlet part and the water outlet part are connected to the machine body part through pipelines. The water supply tank is provided with a corresponding circulating pump, which can provide a continuous flow of water for the machine body part. The load of the hydraulic dynamometer can be adjusted by adjusting the opening degree of the adjusting valves in the water inlet part and the water outlet part. The greater the water inlet amount, the greater the load.

[0010] Further, the machine body part includes a shell, a bearing seat, a rotating shaft and a rotor. The shell is rotatably connected with the rotating shaft. The rotating shaft is rotatably connected with the bearing seat. The rotating shaft is in transmission connection with the shaft coupling. The rotor is in fastening connection with the rotating shaft. The rotor is provided with a plurality of rotors on the rotating shaft. The plurality of rotors are freely rotatable in the shell. The shell is provided with a water inlet and a water outlet. The water inlet is in communication with the water inlet part. The water outlet is in communication with the water outlet part.

[0011] The power of the diesel engine is transmitted to the rotating shaft through the shaft coupling, so as to drive the rotating shaft to rotate in the shell, and further drive the rotor on the rotating shaft to rotate. The inner cavity of the shell is filled with water through the water inlet and the water outlet. When the rotor rotates in the inner cavity of the shell, the water in the inner cavity is forced to rotate. Due to the viscosity, inertia of the water and the violent stirring, impact and shearing action of the rotor on the water, a large friction force is generated between the water and the rotor. These friction forces do work, convert the input mechanical energy into heat energy of the water, and the heat energy is carried out by the water flow. According to the principle of action and reaction, the water exerts a resistance torque on the rotating rotor, which is opposite to the rotation direction. This resistance will be transmitted to the shell, which is the braking torque. The shell is supported on the bearing seat through the swing bearing. The reaction torque transmitted by the rotor makes the shell swing. The swing degree is measured by the dynamometer part, which can be converted into the torque value.

[0012] Further, the shell is internally provided with a cooling inlet and a cooling outlet, the cooling inlet and the cooling outlet are externally connected with a cooling water source, and the shell is further internally provided with an arc-shaped groove, and a temperature control component is arranged in the arc-shaped groove, and the temperature control component can automatically adjust the cooling effect according to the load.

[0013] When the rotor rotates in the shell, a large amount of heat is generated by the friction between the water and the rotor, although the flowing water can take away most of the heat, but as the detection time is prolonged, the water temperature will inevitably rise, and the rise of the water temperature will easily lead to the occurrence of cavitation phenomenon, by arranging the arc-shaped groove in the shell, and installing the temperature control component in the arc-shaped groove to cool the water in the shell, the cooling inlet and the cooling outlet are used to provide a cooling water source for the temperature control component.

[0014] Further, the temperature control component comprises an arc-shaped sliding block and a supporting spring, the arc-shaped sliding block is in sliding connection with the arc-shaped groove, a displacement sensor is integrated in the arc-shaped sliding block, one end of the supporting spring is in fastening connection with the arc-shaped sliding block, and the other end of the supporting spring is in fastening connection with the inner wall of the arc-shaped groove.

[0015] When the water in the shell is driven by the rotor, there will be a reaction force on the shell, the greater the reaction force, the greater the load, and the greater the heat generated, and the flowing water flow will also have the same reaction force on the arc-shaped sliding block, so as to drive the arc-shaped sliding block to deflect to one side along the arc-shaped groove, and the supporting spring is compressed, that is, the greater the deflection angle of the arc-shaped sliding block detected by the displacement sensor, the greater the load of the dynamometer, and the greater the heat generated; the displacement sensor detects and cooperates with the dynamometer component to double-check the load generated on the dynamometer, so as to ensure the accuracy of the detection.

[0016] Further, a flow resistance groove is arranged on the arc-shaped sliding block, and the flow resistance groove faces the rotor.

[0017] By arranging the flow resistance groove on the arc-shaped sliding block, the impact force of the water flow on the arc-shaped sliding block is intensified, so as to improve the detection accuracy; in addition, the flow resistance groove can intensify the disturbance of the water flow, so that the friction force of the water flow at the arc-shaped sliding block is increased, and the heat can be concentrated at the arc-shaped sliding block, so as to facilitate subsequent cooling treatment.

[0018] Further, a cooling flow channel is arranged in the arc-shaped sliding block, and the cooling flow channel is in communication with the cooling inlet and the cooling outlet.

[0019] The arc-shaped sliding block introduces cooling water through the cooling flow channel, so as to cool the water flow in the shell.

[0020] Further, a first inlet and a first outlet are arranged on the cooling flow channel, and the first inlet and the first outlet are arranged in interlaced manner at the connection positions of the cooling inlet and the cooling outlet.

[0021] Through the staggered arrangement of the first inlet and the first outlet and the cooling inlet and the cooling outlet, the flow cross section in the initial state, which is communicated with both, is small, and the cooling water flow is small, when the load increases, the arc-shaped slider is pushed to one side and deviated, the flow cross section communicated with the two inlets and outlets is increased, so that the flow of the cooling water is increased, that is, the flow of the cooling water is automatically adjusted according to the load.

[0022] Further, the power measuring component comprises a brake arm, a tension and pressure sensor, a support base and a protective cover, the brake arm is connected to the shell through bolts; the protective cover is tightly connected with the base, the support base is tightly connected with the base, one end of the tension and pressure sensor is hinged with the brake arm, and the other end of the tension and pressure sensor is hinged with the support base.

[0023] The reaction torque transmitted by the rotor makes the shell swing, and the larger the load is, the larger the deflection angle is, the tension and pressure sensor is connected to the shell through the brake arm, the deflection state of the shell can be detected through the tension and pressure sensor, the brake torque generated by the shell is balanced with the reaction torque of the tension and pressure sensor on the brake arm, so that the size of the brake force is displayed, that is, the size of the real-time power can also be obtained by calculation.

[0024] Further, the flow resistance groove is arranged obliquely, and the oblique direction of the flow resistance groove is opposite to the rotating direction of the rotor.

[0025] The flow resistance groove with the oblique direction opposite to the rotating direction of the rotor can further improve the resistance to the water flow, so that the disturbance of the water flow at the arc-shaped slider is intensified, so that the size of the reaction force of the water flow on the arc-shaped slider is detected.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] 1. The tension and pressure sensor measures the brake torque of the shell, and the displacement sensor on the arc-shaped slider measures the water flow impact force, so that the load is detected doubly, cross verification of data is realized, and the accuracy and reliability of the power measurement result are significantly improved.

[0028] 2. The temperature control component integrated in the arc-shaped groove not only serves as an auxiliary detection of the load, but also automatically adjusts the cooling water flow according to the load size through the staggered arrangement of the first inlet and the first outlet of the cooling flow channel. When the load increases, the flow channel opening degree is automatically increased, and the cooling capacity is synchronously increased. This effectively solves the problem that the water temperature rises in the traditional water power dynamometer during long-time testing, causing cavitation, measurement error and even equipment damage, and ensures the stability and data reliability of long-time and high-load simulation testing.

[0029] 3. The choke groove on the arc-shaped slider not only enhances the impact force of the water flow on the slider, thereby improving the displacement detection sensitivity, but the inclined and reverse arrangement of the choke groove also intensifies the local water flow disturbance, which helps to guide the friction heat more concentratedly to the arc-shaped slider, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the dynamometer component of the present invention;

[0032] Figure 3 It is a partial cross-sectional view of the body component of the present invention;

[0033] Figure 4 for Figure 3 A local enlarged view of point A;

[0034] Figure 5 Schematic diagram of the installation of the rotor and the shaft;

[0035] Figure 6 Schematic diagram of the temperature control component;

[0036] Figure 7 is a partial cross-sectional view of the housing;

[0037] Figure 8 for Figure 7 A partial enlarged view of point B.

[0038] In the figure: 1. Test bench; 2. Coupling; 3. Base; 4. Water inlet component; 5. Water outlet component; 6. Body component; 61. Housing; 611. Water inlet; 612. Water outlet; 613. Cooling inlet; 614. Cooling outlet; 615. Arc groove; 62. Bearing seat; 63. Rotating shaft; 64. Rotor; 7. Dynamometer component; 71. Brake arm; 72. Pull and pressure sensor; 73. Support seat; 74. Protective cover; 8. Temperature control component; 81. Arc slider; 811. choke groove; 812. Cooling channel; 8121. First inlet; 8122. First outlet; 82. Support spring. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Example: Figures 1-8As shown, the present application provides a diesel engine repair test device with working condition simulation function technical scheme, the test device includes test bench 1 and coupling 2, the test bench 1 is installed with the engine to be measured, the output end of the engine is drivingly connected with the coupling 2, one side of the coupling 2 is provided with a hydraulic dynamometer, the hydraulic dynamometer includes base 3, water inlet component 4, water outlet component 5, machine body component 6 and power measuring component 7, the base 3 is fastenedly connected with the test bench 1, the water inlet component 4 and the water outlet component 5 are connected with the machine body component 6, the power measuring component 7 is connected with the base 3, and the power measuring component 7 is used for detecting the power of the engine.

[0041] The test bench 1 is fixed on the ground to provide stable support for the test device, the engine to be measured is installed on the test bench 1, the engine to be measured is a diesel engine, after being disassembled and repaired, the diesel engine needs to be tested and accepted according to the acceptance specification, so as to ensure that the repaired diesel engine is qualified, and the output power of the diesel engine is generally detected by the hydraulic dynamometer; before detection, it is necessary to ensure that the oil level of the diesel engine is qualified, and the diesel engine is connected to the corresponding oil circuit and circuit, and then the diesel engine is started, the power of the diesel engine is transmitted to the hydraulic dynamometer through the coupling, the hydraulic dynamometer is based on the principle of liquid resistance, absorbs mechanical energy through the interaction of water and rotating parts and converts it into heat energy, and at the same time realizes power calculation through measuring reaction torque; the water inlet component 4 and the water outlet component 5 provide water source for the machine body component 6, the machine body component 6 is the main component of the dynamometer for absorbing the effective torque of the power machine by using water, the mechanical energy output by the diesel engine is converted into heat energy here, and the reaction force generated by the machine body component 6 is detected by the power measuring component 7, and the detection result is the real-time power of the diesel engine.

[0042] The water inlet component 4 and the water outlet component 5 are connected to the machine body component 6 through pipelines, and the water inlet component 4 and the water outlet component 5 are provided with adjusting valves, and the adjusting valves are used for adjusting the load of the hydraulic dynamometer.

[0043] The water inlet component 4 and the water outlet component 5 are connected to the machine body component 6 through pipelines, and the water inlet component 4 and the water outlet component 5 are provided with adjusting valves, and the adjusting valves are used for adjusting the load of the hydraulic dynamometer.

[0044] The machine body component 6 includes a shell 61, a bearing seat 62, a rotating shaft 63 and a rotor 64, the shell 61 is rotatably connected with the rotating shaft 63, the rotating shaft 63 is rotatably connected with the bearing seat 62, the rotating shaft 63 is drivingly connected with the coupling 2, the rotor 64 is fastenedly connected with the rotating shaft 63, and a plurality of rotors 64 are arranged on the rotating shaft 63 and freely rotate in the shell 61; the shell 61 is provided with a water inlet 611 and a water outlet 612, the water inlet 611 is communicated with the water inlet component 4, and the water outlet 612 is communicated with the water outlet component 5.

[0045] The power of the diesel engine is transmitted to the rotating shaft 63 through the shaft coupling 2, so as to drive the rotating shaft 63 to rotate in the shell 61, and further drive the rotor 64 on the rotating shaft 63 to rotate, and the inner cavity of the shell 61 is filled with water through the water inlet 611 and the water outlet 612, when the rotor 64 rotates in the inner cavity of the shell 61, the water in the inner cavity is forced to rotate, due to the viscosity, inertia of the water and the violent stirring, impact and shearing of the rotor 64 on the water, a large friction force is generated between the water and the rotor 64, the friction force does work, converts the input mechanical energy into heat energy of the water, and the heat energy is taken out by the water flow; according to the principle of action and reaction, the water exerts a resistance torque on the rotating rotor 64, which is opposite to the rotating direction, the resistance is transmitted to the shell 61, which is the braking torque, the shell 61 is supported on the bearing seat 62 through the swing bearing, and the counteracting torque transmitted by the rotor 64 makes the shell 61 swing, and the swing degree is measured by the dynamometer component 7, that is, the torque value is converted.

[0046] The shell 61 is provided with a cooling inlet 613 and a cooling outlet 614, the cooling inlet 613 and the cooling outlet 614 are connected with a cooling water source, and the shell 61 is further provided with an arc-shaped groove 615, the arc-shaped groove 615 is provided with a temperature control component 8, and the temperature control component 8 can automatically adjust the cooling effect according to the load.

[0047] When the rotor 64 rotates in the shell 61, a large amount of heat is generated by the friction between the water and the rotor 64, although most of the heat can be taken away by the flowing water, but with the extension of the detection time, the water temperature will inevitably rise, and the rise of the water temperature will easily lead to the occurrence of cavitation phenomenon, by setting the arc-shaped groove 615 in the shell 61, and installing the temperature control component 8 in the arc-shaped groove 615 to cool the water in the shell 61, the cooling inlet 613 and the cooling outlet 614 are used to provide a cooling water source for the temperature control component 8.

[0048] The temperature control component 8 comprises an arc-shaped sliding block 81 and a supporting spring 82, the arc-shaped sliding block 81 is in sliding connection with the arc-shaped groove 615, the arc-shaped sliding block 81 is integrated with a displacement sensor, one end of the supporting spring 82 is in fastening connection with the arc-shaped sliding block 81, and the other end of the supporting spring 82 is in fastening connection with the inner wall of the arc-shaped groove 615.

[0049] When the water in the shell 61 is driven by the rotor 64, there will be a counteracting force on the shell 61, the greater the counteracting force, the greater the load, and the greater the heat generated, and the flowing water flow also generates the same counteracting force on the arc-shaped sliding block 81, so as to drive the arc-shaped sliding block 81 to deflect to one side along the arc-shaped groove 615, and the supporting spring 82 is compressed, that is, the greater the deflection angle of the arc-shaped sliding block 81 detected by the displacement sensor, the greater the load of the dynamometer, and the greater the heat generated; the displacement sensor detects and cooperates with the dynamometer component 7, so as to double detect the load generated on the dynamometer, thereby ensuring the accuracy of the detection.

[0050] The arc-shaped sliding block 81 is provided with a flow resistance groove 811, and the flow resistance groove 811 is directed towards the rotor 64.

[0051] By arranging the flow resistance groove 811 on the arc-shaped sliding block 81, the impact force of the water flow on the arc-shaped sliding block 81 is intensified, so as to improve the detection accuracy. In addition, the flow resistance groove 811 can intensify the disturbance of the water flow, so that the friction force of the water flow at the arc-shaped sliding block 81 is increased, and the heat can be concentrated at the arc-shaped sliding block 81, thereby facilitating the subsequent cooling treatment.

[0052] The arc-shaped sliding block 81 is provided with a cooling flow channel 812, and the cooling flow channel 812 is in communication with the cooling inlet 613 and the cooling outlet 614.

[0053] The arc-shaped sliding block 81 introduces cooling water through the cooling flow channel 812, so as to perform temperature reduction treatment on the water flow in the outer shell 61.

[0054] The cooling flow channel 812 is provided with a first inlet 8121 and a first outlet 8122, and the first inlet 8121 and the first outlet 8122 are arranged in a staggered manner at the connection positions of the cooling inlet 613 and the cooling outlet 614.

[0055] Through the staggered arrangement of the first inlet 8121 and the first outlet 8122 and the cooling inlet 613 and the cooling outlet 614, the flow cross section in communication between them in the initial state is small, and the cooling water flow is small. When the load increases and the arc-shaped sliding block 81 is pushed to one side and deviated, the flow cross section in communication between the two inlets and outlets is increased, so that the flow of the cooling water is correspondingly increased, that is, the flow of the cooling water is automatically adjusted according to the load.

[0056] The dynamometer component 7 comprises a brake arm 71, a tension and pressure sensor 72, a support seat 73 and a protective cover 74. The brake arm 71 is connected to the outer shell 61 through bolts. The protective cover 74 is tightly connected to the base 3. The support seat 73 is tightly connected to the base 3. One end of the tension and pressure sensor 72 is hinged to the brake arm 71, and the other end of the tension and pressure sensor 72 is hinged to the support seat 73.

[0057] The reaction torque transmitted by the rotor 64 causes the outer shell 61 to swing, and the greater the load, the greater the angle of deflection. The tension and pressure sensor 72 is connected to the outer shell 61 through the brake arm 71. The deflection state of the outer shell 61 can be detected through the tension and pressure sensor 72. The brake torque generated by the outer shell 61 is balanced with the reaction torque of the tension and pressure sensor 72 on the brake arm 71, so as to show the size of the brake force, that is, the size of the real-time power can also be obtained by calculation.

[0058] The flow resistance groove 811 is arranged in an inclined manner, and the inclination direction of the flow resistance groove 811 is opposite to the rotation direction of the rotor 64.

[0059] The resistance groove 811 opposite to the rotating direction of the rotor 64 can further increase the resistance to the water flow, so that the disturbance of the water flow at the arc-shaped slider 81 is intensified, so as to detect the size of the reaction force of the water flow to the arc-shaped slider 81.

[0060] The working principle of the present application is as follows: the diesel engine to be tested is installed on the test bench 1, and is driven to rotate the rotating shaft 63 of the hydraulic dynamometer through the shaft coupling 2, the fixed rotor 64 on the rotating shaft 63 rotates in the sealed water cavity of the outer shell 61, the water inlet component 4 and the water outlet component 5 continuously supply water into the cavity, and the water quantity is controlled by the adjusting valve to set the load, the greater the water quantity, the greater the load. When the rotor 64 rotates, the water in the cavity is stirred violently, the water flow generates a huge frictional resistance to the rotor 64 due to viscosity, inertia and shearing effect, the mechanical energy of the diesel engine is converted into the heat energy of the water, and the heat is taken out by the flowing water. According to the principle of action and reaction, the resistance moment of the water to the rotor 64 is converted into the reaction moment of the outer shell 61 swinging around the bearing seat; the swinging of the outer shell 61 is transmitted to the tension and pressure sensor 72 through the brake arm 71, the tension and pressure sensor 72 measures the action force generated by the swinging, and the brake moment can be accurately calculated by combining the length of the force arm, and then the real-time output power of the diesel engine is converted; the temperature control component 8 in the water cavity of the outer shell 61 is slidably installed in the arc-shaped groove 615 of the outer shell 61 through the supporting spring 82, the water flow impact force is positively correlated with the load, and the arc-shaped slider 81 is pushed to slide along the arc-shaped groove 615, and the displacement of the arc-shaped slider 81 is detected by the displacement sensor as a double verification signal of the load of the diesel engine; the surface of the arc-shaped slider 81 is provided with the resistance groove 811 opposite to the rotating direction of the rotor 64, the water flow disturbance and impact force are intensified, the detection sensitivity is improved, and the heat is concentrated at the position of the arc-shaped slider 81; the arc-shaped slider 81 is internally provided with a cooling flow channel 812, the first inlet 8121 and the first outlet 8122 of the cooling flow channel 812 are staggered with the cooling inlet 613 and the cooling outlet 614 of the outer shell 61, the overlapping area of the flow channel is small in the initial state, and the cooling water flow is low; when the displacement of the arc-shaped slider 81 increases due to the increase of the load, the opening degree of the flow channel automatically increases, and the cooling water flow increases accordingly, so that the cooling efficiency is self-adaptively adjusted according to the water temperature, the high-temperature cavitation is effectively prevented, and the test stability is ensured.

[0061] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A diesel engine maintenance test device with operating condition simulation function, characterized by: The test device comprises a test bench (1) and a coupling (2), wherein a tested engine is mounted on the test bench (1), an output end of the engine is in transmission connection with the coupling (2), a hydraulic dynamometer is provided on one side of the coupling (2), and the hydraulic dynamometer comprises a base (3), a water inlet component (4), a water outlet component (5), a body component (6), and a dynamometer component (7), wherein the base (3) is tightly connected to the test bench (1), the water inlet component (4) and the water outlet component (5) are connected to the body component (6), and the dynamometer component (7) is connected to the base (3), and the dynamometer component (7) is used to detect the power of the engine; The body part includes a housing (61); A cooling inlet (613) and a cooling outlet (614) are provided in the housing (61), and the cooling inlet (613) and the cooling outlet (614) are externally connected to a cooling water source. An arc-shaped groove (615) is also provided in the housing (61), and a temperature control component (8) is provided in the arc-shaped groove (615). The temperature control component (8) can automatically adjust the cooling effect according to the load. The temperature control component (8) includes an arc-shaped slider (81) and a support spring (82), wherein the arc-shaped slider (81) is slidably connected to the arc-shaped groove (615), a displacement sensor is integrated in the arc-shaped slider (81), one end of the support spring (82) is fastened to the arc-shaped slider (81), and the other end of the support spring (82) is fastened to the inner wall of the arc-shaped groove (615).

2. A diesel engine maintenance test device with operating condition simulation function according to claim 1, characterized in that: The water inlet component (4) and the water outlet component (5) are externally connected to a water supply tank. A regulating valve is provided in each of the water inlet component (4) and the water outlet component (5). The regulating valve is used to adjust the load of the hydraulic dynamometer.

3. A diesel engine maintenance test device with operating condition simulation function according to claim 2, characterized in that: The body component (6) further comprises a bearing seat (62), a rotating shaft (63) and a rotor (64); the housing (61) is rotatably connected to the rotating shaft (63); the rotating shaft (63) is rotatably connected to the bearing seat (62); the rotating shaft (63) is transmission-connected to the coupling (2); the rotor (64) is tightly connected to the rotating shaft (63); a plurality of rotors (64) are provided on the rotating shaft (63); and the plurality of rotors (64) rotate freely within the housing (61); a water inlet (611) and a water outlet (612) are provided on the housing (61); the water inlet (611) is communicated with the water inlet component (4), and the water outlet (612) is communicated with the water outlet component (5).

4. The diesel engine maintenance test device with operating condition simulation function according to claim 1, characterized in that: The arc-shaped slider (81) is provided with a choke groove (811), and the choke groove (811) faces the rotor (64).

5. The diesel engine maintenance test device with operating condition simulation function according to claim 1, characterized in that: A cooling channel (812) is provided in the arc-shaped slider (81), and the cooling channel (812) is communicated with a cooling inlet (613) and a cooling outlet (614).

6. The diesel engine maintenance test device with operating condition simulation function according to claim 5, characterized in that: The cooling flow channel (812) is provided with a first inlet (8121) and a first outlet (8122), and the first inlet (8121) and the first outlet (8122) are arranged in an interlaced manner at the connection points with the cooling inlet (613) and the cooling outlet (614).

7. The diesel engine maintenance test device with operating condition simulation function according to claim 3, characterized in that: The dynamometer component (7) includes a brake arm (71), a tension and pressure sensor (72), a support seat (73) and a protective cover (74); the brake arm (71) is connected to the housing (61) by a bolt; the protective cover (74) is fastened to the base (3); the support seat (73) is fastened to the base (3); one end of the tension and pressure sensor (72) is hinged to the brake arm (71); and the other end of the tension and pressure sensor (72) is hinged to the support seat (73).

8. The diesel engine maintenance test device with operating condition simulation function according to claim 4, characterized in that: The choke groove (811) is arranged obliquely, and the inclination direction of the choke groove (811) is opposite to the rotation direction of the rotor (64).

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