Diesel engine maintenance testing device with working condition simulation function

Abstract

The invention discloses a diesel engine maintenance test device with a working condition simulation function, and relates to the technical field of dynamometer, the test device comprises a test bench and a coupler, the test bench is provided with a tested engine, the output end of the engine is in transmission connection with the coupler, and one side of the coupler is provided with a hydraulic dynamometer; the hydraulic dynamometer comprises a base, a water inlet part, a water outlet part, a machine body part and a dynamometer part, the base is fixedly connected with the test bed, the water inlet part and the water outlet part are connected with the machine body part, and the dynamometer part is connected with the base and used for detecting the power of the engine; the test bench is fixed on the ground to provide stable support for the test device, the tested engine is installed on the test bench and is a diesel engine, and the diesel engine needs to be tested and accepted according to acceptance specifications after being disassembled and maintained, so that the maintained diesel engine is qualified, and the test efficiency is improved. Generally, the output power of the diesel engine is detected through a hydraulic dynamometer.

Description

Technical Field

[0001] The invention relates to the technical field of dynamometer testing, in particular to a diesel engine maintenance testing device with a working condition simulation function. Background Art

[0002] In the field of diesel engine maintenance, post-repair performance acceptance is crucial, requiring load testing to verify key indicators such as output power according to specifications. Traditional testing generally uses a hydraulic dynamometer as a load device. This principle involves rotating the rotor in a closed water chamber, utilizing the frictional resistance of the water flow to absorb the diesel engine's mechanical energy and convert it into heat. The power is calculated by measuring the reaction torque on the casing. However, existing technologies have some shortcomings.

[0003] Insufficient measurement reliability: Relying only on a single brake arm sensor to detect braking torque, data drift is easily caused by mechanical loss or external interference during long-term high-load operation, making it difficult to meet the high-precision requirements of maintenance acceptance.

[0004] Weak temperature control: Continuous friction between the water and the rotor generates significant heat. Although heat is dissipated through inlet and outlet water circulation, the water temperature rises dramatically with load and time. When the water temperature exceeds a critical value, cavitation can easily occur, reducing test accuracy and potentially damaging the dynamometer's rotor and cavity structure. Summary of the Invention

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

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: the testing device includes a test bench and a coupling, the engine to be tested is installed on the test bench, the output end of the engine is transmission-connected to the coupling, a hydraulic dynamometer is provided on one side of the coupling, the hydraulic dynamometer includes a base, a water inlet component, a water outlet component, a body component and a dynamometer component, the base is tightly connected to the test bench, the water inlet component and the water outlet component are connected to the body component, the dynamometer component is connected to the base, and the dynamometer component is used to detect the power of the engine.

[0007] The test bench is fixed to the ground to provide stable support for the test device. The engine under test is installed on the test bench. The engine under test is a diesel engine. After the diesel engine is disassembled and repaired, it needs to be tested and accepted according to the acceptance specifications to ensure that the repaired diesel engine is qualified. Generally, a hydraulic dynamometer is used to detect the output power of the diesel engine. Before the detection, it is necessary to ensure that the oil level of the diesel engine is qualified, and connect the diesel engine 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 a coupling. The hydraulic dynamometer is based on the principle of liquid resistance. It absorbs mechanical energy and converts it into heat energy through the interaction between water and rotating components. At the same time, the power is calculated by measuring the reaction torque. The water inlet component and the water outlet component provide water source for the body component. The body component is the main component for the dynamometer to use water to absorb the effective torque of the power engine. The mechanical energy output by the diesel engine is converted into heat energy here. The reaction force generated on the body component is detected by the dynamometer component, and the detection result is the real-time power of the diesel engine.

[0008] Further, the water inlet component and the water outlet component are externally connected to a water supply tank. A regulating valve is provided in both the water inlet component and the water outlet component. The regulating valve is used to adjust the load of the hydraulic dynamometer.

[0009] The water inlet component and the water outlet component are connected to the body component through pipelines. A corresponding circulation pump is provided in the externally connected water supply tank, which can provide a continuous stream of water for the body component. By adjusting the opening degree of the regulating valves in the water inlet component and the water outlet component, the load of the hydraulic dynamometer can be adjusted. The greater the water inflow, the greater the load.

[0010] Further, the body component includes a housing, a bearing seat, a rotating shaft and a rotor. The housing is rotatably connected to the rotating shaft. The rotating shaft is rotatably connected to the bearing seat. The rotating shaft is in transmission connection with the coupling. The rotor is fixedly connected to the rotating shaft. A number of rotors are provided on the rotating shaft. The several rotors rotate freely in the housing. The housing is provided with a water inlet and a water outlet. The water inlet is communicated with the water inlet component, and the water outlet is communicated with the water outlet component.

[0011] The power of the diesel engine is transmitted to the rotating shaft through the coupling, thereby driving the rotating shaft to rotate in the housing, and then driving the rotor on the rotating shaft to rotate. The inner cavity of the housing is filled with water through the water inlet and the water outlet. When the rotor rotates in the inner cavity of the housing, the water in the inner cavity is forced to rotate accordingly. Due to the viscosity, inertia of the water, as well as the strong agitation, impact and shear action of the rotor on the water, a huge frictional force is generated between the water and the rotor. These frictional forces do work and convert the input mechanical energy into the heat energy of the water. 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 in the opposite direction of rotation. This resistance will be transmitted to the housing, which is the braking torque. The housing is supported on the bearing seat through a swing bearing. The reaction torque transmitted by the rotor causes the housing to swing. By measuring the swing force through the dynamometer component, the torque value can be converted.

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

[0013] When the rotor rotates inside the outer shell, a large amount of heat will be generated due to the friction between the water and the rotor. Although the flowing water can take away most of the heat, as the detection time prolongs, the water temperature will inevitably rise, and the rise of the water temperature will easily lead to the occurrence of cavitation phenomenon. By arranging an arc-shaped groove inside the outer shell and installing a temperature control component in the arc-shaped groove to cool the water inside the outer 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 includes an arc-shaped slider and a support spring. The arc-shaped slider is slidably connected to the arc-shaped groove. A displacement sensor is integrated inside the arc-shaped slider. One end of the support spring is fixedly connected to the arc-shaped slider, and the other end of the support spring is fixedly connected to the inner wall of the arc-shaped groove.

[0015] When the water inside the outer shell is driven by the rotor, a reaction force will be exerted on the outer shell. The greater the reaction force, the greater the load indicates, and the more heat is generated. The flowing water flow will also generate the same reaction force on the arc-shaped slider, thereby driving the arc-shaped slider to deflect to one side along the arc-shaped groove, and the support spring is compressed. That is, the greater the angle of deflection of the arc-shaped slider detected by the displacement sensor, the greater the load of the dynamometer indicates, and the more heat is generated. The detection of the displacement sensor and the cooperation of the dynamometer component can double-detect the load generated on the dynamometer, thereby ensuring the accuracy of the detection.

[0016] Further, a flow blocking groove is provided on the arc-shaped slider, and the flow blocking groove faces the rotor.

[0017] By arranging a flow blocking groove on the arc-shaped slider, the impact force of the water flow on the arc-shaped slider is increased, thereby improving the accuracy of the detection; in addition, the flow blocking groove can intensify the disturbance of the water flow, making the frictional force of the water flow at the arc-shaped slider increase, and the heat can be concentrated at the arc-shaped slider, thus facilitating subsequent cooling treatment.

[0018] Further, a cooling flow channel is provided inside the arc-shaped slider, and the cooling flow channel is communicated with the cooling inlet and the cooling outlet.

[0019] The arc-shaped slider introduces the cooling water through the cooling flow channel, thereby cooling the water flow inside the outer shell.

[0020] Further, a first inlet and a first outlet are provided on the cooling flow channel, and the connections of the first inlet and the first outlet with the cooling inlet and the cooling outlet are arranged in a staggered manner.

[0021] Through the first inlet and the first outlet arranged in an interleaved manner and the cooling inlet and the cooling outlet, the cross-sectional area of the flow-through section that is connected in the initial state is small, and the cooling water flow rate is small. When the load increases and the arc-shaped slider is pushed to deflect to one side, the overlapping area of the cross-sectional area of the two inlets and outlets that are connected increases, so that the flow rate of the cooling water is correspondingly increased, that is, the flow rate of the cooling water is automatically adjusted according to the load.

[0022] Further, the dynamometer component includes a brake arm, a tension and compression sensor, a support seat and a protective cover. The brake arm is connected to the housing by bolts; the protective cover is fixedly connected to the base, the support seat is fixedly connected to the base, one end of the tension and compression sensor is hinged to the brake arm, and the other end of the tension and compression sensor is hinged to the support seat.

[0023] The reaction torque transmitted by the rotor causes the housing to swing, and the greater the load, the greater the deflection angle. By connecting the tension and compression sensor to the housing through the brake arm, the deflection state of the housing is detected by the tension and compression sensor. The braking torque generated by the housing is balanced with the reaction torque of the tension and compression sensor on the brake arm, so as to display the magnitude of the braking force, that is, the magnitude of the real-time power can also be obtained by calculation.

[0024] Further, the flow blocking grooves are arranged obliquely, and the inclination direction of the flow blocking grooves is opposite to the rotation direction of the rotor.

[0025] The flow blocking grooves with an inclination direction opposite to the rotation direction of the rotor can further increase the resistance to the water flow, making the disturbance of the water flow at the arc-shaped slider more intense, so as to facilitate the detection of the magnitude of the reaction force of the water flow on the arc-shaped slider.

[0026] Compared with the prior art, the beneficial effects of the present invention are: 1. The combination of the tension and compression sensor measuring the braking torque of the housing and the displacement sensor on the arc-shaped slider measuring the water flow impact force performs double detection on the load, realizes cross-verification of data, and significantly improves the accuracy and credibility of the power measurement result.

[0027] 2. The temperature control component integrated in the arc-shaped groove not only serves as an auxiliary detection of the load, but also can automatically adjust the cooling water flow rate according to the load size through the first inlet and the first outlet of the interleaved cooling channels. When the load increases, the opening of the flow channel automatically increases, and the cooling capacity is enhanced synchronously. This effectively solves the problems of cavitation, measurement inaccuracy and even equipment damage caused by the increase in water temperature during long-term testing of traditional hydraulic dynamometers, and ensures the stability and data reliability of long-term and high-load working condition simulation tests.

[0028] 3. The flow blocking grooves on the arc-shaped slider not only enhance the impact force of the water flow on the slider, thereby improving the displacement detection sensitivity, but also the reverse inclined arrangement of the flow blocking grooves intensifies the local water flow disturbance, which helps to more concentratedly guide the frictional heat to the arc-shaped slider, improving the cooling efficiency. Brief Description of the Drawings

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the dynamometer component of the present invention; Figure 3 is a partial cross-sectional view of the body component of the present invention; Figure 4 is Figure 3 a partially enlarged view at position A of Figure 5 is a schematic diagram of the installation of the rotor and the rotating shaft; Figure 6 is a schematic diagram of the temperature control component; Figure 7 is a partial cross-sectional view of the outer shell; Figure 8 is Figure 7 a partially enlarged view at position B of

[0030] In the figures: 1, test bench; 2, coupling; 3, base; 4, water inlet component; 5, water outlet component; 6, body component; 61, outer shell; 611, water inlet; 612, water outlet; 613, cooling inlet; 614, cooling outlet; 615, arc-shaped groove; 62, bearing seat; 63, rotating shaft; 64, rotor; 7, dynamometer component; 71, brake arm; 72, tension and compression sensor; 73, support seat; 74, protective cover; 8, temperature control component; 81, arc-shaped slider; 811, flow blocking groove; 812, cooling flow channel; 8121, first inlet; 8122, first outlet; 82, support spring. Detailed Description of the Preferred Embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment: As Figures 1 - 8 shown, the present invention provides a technical solution for a diesel engine maintenance test device with a working condition simulation function. The test device includes a test bench 1 and a coupling 2. A tested engine is installed on the test bench 1, and the 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. The hydraulic dynamometer includes a base 3, a water inlet component 4, a water outlet component 5, a body component 6, and a dynamometer component 7. The base 3 is fixedly connected to the test bench 1. The water inlet component 4 and the water outlet component 5 are connected to the body component 6. The dynamometer component 7 is connected to the base 3. The dynamometer component 7 is used to detect the power of the engine.

[0033] Test bench 1 is fixed to the ground to provide stable support for the test device. The engine under test is installed on test bench 1. The engine under test is a diesel engine. After being disassembled and repaired, the diesel engine needs to be tested and accepted according to acceptance specifications to ensure that the repaired diesel engine is qualified. The output power of the diesel engine is generally tested using a hydraulic dynamometer. Before testing, it is necessary to ensure that the diesel engine oil level is qualified and the diesel engine is connected to the corresponding oil circuit and electrical circuit. The diesel engine is then started. The diesel engine power is transmitted to the hydraulic dynamometer through a coupling. The hydraulic dynamometer is based on the principle of liquid resistance. Through the interaction between water and rotating parts, mechanical energy is absorbed and converted into heat energy. At the same time, power calculation is achieved by measuring the reaction torque. The water inlet component 4 and the water outlet component 5 provide a water source to the body component 6. The body component 6 is the main component of the dynamometer that uses water to absorb the effective torque of the power engine. The mechanical energy output by the diesel engine is converted here into heat energy. The reaction force generated on the body component 6 is detected by the dynamometer component 7. The test result is the real-time power of the diesel engine.

[0034] The water inlet component 4 and the water outlet component 5 are externally connected to a water supply tank. Both the water inlet component 4 and the water outlet component 5 are provided with regulating valves for adjusting the load of the hydraulic dynamometer.

[0035] The water inlet component 4 and the water outlet component 5 are connected to the body component 6 through pipes. A corresponding circulation pump is provided in the external water supply tank, which can provide a continuous flow of water to the body component 6. The load of the hydraulic dynamometer can be adjusted by adjusting the opening of the regulating valve in the water inlet component 4 and the water outlet component 5. The greater the water inlet, the greater the load.

[0036] The 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 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, and the rotor 64 is tightly connected to the rotating shaft 63. Several rotors 64 are provided on the rotating shaft 63, and several rotors 64 rotate freely in the shell 61; a water inlet 611 and a water outlet 612 are provided on the shell 61, the water inlet 611 is connected to the water inlet component 4, and the water outlet 612 is connected to the water outlet component 5.

[0037] The power of the diesel engine is transmitted to the rotating shaft 63 through the coupling 2, driving the rotating shaft 63 to rotate within the housing 61, and further driving the rotor 64 on the rotating shaft 63 to rotate. The inner cavity of the housing 61 is filled with water through the water inlet 611 and the water outlet 612. When the rotor 64 rotates within the inner cavity of the housing 61, the water in the inner cavity is forced to rotate accordingly. Due to the viscosity, inertia of the water, as well as the intense agitation, impact, and shearing effects of the rotor 64 on the water, a huge frictional force is generated between the water and the rotor 64. These frictional forces do work, converting the input mechanical energy into the thermal energy of the water, and the thermal 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 64 in the opposite direction of the rotation direction, and this resistance is transmitted to the housing 61, which is the braking torque. The housing 61 is supported on the bearing seat 62 through the swing bearing. The reaction torque transmitted by the rotor 64 causes the housing 61 to swing, and by measuring the swing force through the dynamometer component 7, the torque value can be converted.

[0038] A cooling inlet 613 and a cooling outlet 614 are provided inside the housing 61. 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 inside the housing 61, and a temperature control component 8 is arranged in the arc-shaped groove 615. The temperature control component 8 can automatically adjust the cooling effect according to the load.

[0039] When the rotor 64 rotates within the housing 61, a large amount of heat is generated due to the friction between the water and the rotor 64. Although the flowing water can carry away most of the heat, as the detection time prolongs, the water temperature will inevitably rise, and the increase in water temperature is likely to cause cavitation. By arranging the arc-shaped groove 615 inside the housing 61 and installing the temperature control component 8 in the arc-shaped groove 615 to cool the water inside the housing 61, the cooling inlet 613 and the cooling outlet 614 are used to provide a cooling water source for the temperature control component 8.

[0040] The temperature control component 8 includes an arc-shaped slider 81 and a support spring 82. The arc-shaped slider 81 is slidably connected to the arc-shaped groove 615. A displacement sensor is integrated inside the arc-shaped slider 81. One end of the support spring 82 is firmly connected to the arc-shaped slider 81, and the other end of the support spring 82 is firmly connected to the inner wall of the arc-shaped groove 615.

[0041] When the water inside the housing 61 is driven by the rotor 64, it will have a reaction force on the housing 61. The greater the reaction force, the greater the load indicates, and the more heat is generated. The flowing water flow will also generate the same reaction force on the arc-shaped slider 81, thereby driving the arc-shaped slider 81 to deflect to one side along the arc-shaped groove 615, and the support spring 82 is compressed. That is, the greater the angle of deflection of the arc-shaped slider 81 detected by the displacement sensor, the greater the load of the dynamometer indicates, and the more heat is generated. The detection of the displacement sensor and the cooperation of the dynamometer component 7 can double-detect the load generated on the dynamometer, thus ensuring the accuracy of the detection.

[0042] The arc-shaped slider 81 is provided with a flow-blocking groove 811, and the flow-blocking groove 811 faces the rotor 64.

[0043] By arranging the flow-blocking groove 811 on the arc-shaped slider 81, the impact force of the water flow on the arc-shaped slider 81 is intensified, thereby improving the detection accuracy; in addition, the flow-blocking groove 811 can intensify the disturbance of the water flow, increasing the frictional force of the water flow at the arc-shaped slider 81, and concentrating the heat at the arc-shaped slider 81, which is convenient for subsequent cooling treatment.

[0044] The arc-shaped slider 81 is provided with a cooling flow channel 812, and the cooling flow channel 812 communicates with the cooling inlet 613 and the cooling outlet 614.

[0045] The arc-shaped slider 81 introduces cooling water through the cooling flow channel 812, thereby cooling the water flow in the housing 61.

[0046] The cooling flow channel 812 is provided with a first inlet 8121 and a first outlet 8122, and the connection parts of the first inlet 8121 and the first outlet 8122 with the cooling inlet 613 and the cooling outlet 614 are arranged in an interlaced manner.

[0047] Through the interlaced arrangement of the first inlet 8121 and the first outlet 8122 with the cooling inlet 613 and the cooling outlet 614, the cross-sectional area of the flow-through section where they are connected is relatively small in the initial state, and the cooling water flow rate is small. When the load increases and the arc-shaped slider 81 is pushed to deflect to one side, the overlapping area of the cross-sectional areas of the two inlets and outlets that are connected increases, so that the flow rate of the cooling water is correspondingly increased, that is, the flow rate of the cooling water is automatically adjusted according to the load.

[0048] The dynamometer component 7 includes a brake arm 71, a tension and compression sensor 72, a support seat 73 and a protective cover 74. The brake arm 71 is connected to the housing 61 by bolts; the protective cover 74 is fixedly connected to the base 3, the support seat 73 is fixedly connected to the base 3, one end of the tension and compression sensor 72 is hinged to the brake arm 71, and the other end of the tension and compression sensor 72 is hinged to the support seat 73.

[0049] The reaction torque transmitted by the rotor 64 causes the housing 61 to swing, and the greater the load, the greater the deflection angle. By connecting the tension and compression sensor 72 to the housing 61 through the brake arm 71, the deflection state of the housing 61 is detected by the tension and compression sensor 72. The braking torque generated by the housing 61 is balanced with the reaction torque of the tension and compression sensor 72 on the brake arm 71, thereby showing the magnitude of the braking force, that is, the magnitude of the real-time power can also be obtained by calculation.

[0050] The flow-blocking groove 81 is arranged obliquely, and the inclination direction of the flow-blocking groove 811 is opposite to the rotation direction of the rotor 64.

[0051] The flow-blocking groove 811 with an inclination direction opposite to the rotation direction of the rotor 64 can further increase the resistance to water flow, intensify the disturbance of the water flow at the arc-shaped slider 81, so as to facilitate the detection of the magnitude of the reaction force of the water flow on the arc-shaped slider 81.

[0052] The working principle of the present invention: The diesel engine to be measured is installed on the test bench 1, and the rotating shaft 63 of the hydraulic dynamometer is driven to rotate through the coupling 2. The rotor 64 fixed 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 to the cavity, and the water volume is controlled by the regulating valve to set the load. The larger the water volume, the greater the load. When the rotor 64 rotates, it violently stirs the water in the cavity. Due to viscosity, inertia and shear action, the water flow generates a huge frictional resistance on the rotor 64, converting the mechanical energy of the diesel engine into the heat energy of the water. The heat is carried out by the flowing water. According to the principle of action and reaction, the resistance moment exerted by the water on the rotor 64 will be converted into a reaction moment that causes the outer shell 61 to swing around the bearing seat; the swing of the outer shell 61 is transmitted to the tension-compression sensor 72 through the brake arm 71. The tension-compression sensor 72 measures the acting force generated by the swing, and the braking moment can be accurately calculated by combining the length of the force arm, and then the real-time output power of the diesel engine can be 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 support spring 82. The water flow impact force, which is positively correlated with the load, pushes the arc-shaped slider 81 to slide along the arc-shaped groove 615. Its displacement is detected by the displacement sensor and used as a double verification signal for the diesel engine load; the surface of the arc-shaped slider 81 is provided with a flow-blocking groove 811 with an inclination direction opposite to the rotation direction of the rotor 64, which intensifies the water flow disturbance and impact force, improves the detection sensitivity and concentrates the heat at the position of the arc-shaped slider 81. The arc-shaped slider 81 is internally provided with a cooling flow channel 812, and its first inlet 8121 and first outlet 8122 are arranged in a staggered manner with the cooling inlet 613 and cooling outlet 614 of the outer shell 61. In the initial state, the overlapping area of the flow channels is small and the cooling water flow rate is low; when the load increases and causes the displacement of the arc-shaped slider 81, the opening of the flow channel automatically increases, and the cooling water flow rate increases accordingly, realizing the adaptive adjustment of the cooling efficiency according to the water temperature, effectively preventing high-temperature cavitation and ensuring the test stability.

[0053] For those skilled in the art, it is obvious that the present invention 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 basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A test device for diesel engine maintenance with a working condition simulation function, characterized in that: The test device includes a test bench (1) and a coupling (2). The test bench (1) is equipped with an engine under test, the output end of the engine is drivingly connected to the coupling (2), and a hydraulic dynamometer is provided on one side of the coupling (2). The hydraulic dynamometer includes a base (3), a water inlet component (4), a water outlet component (5), a body component (6), and a dynamometer component (7). The base (3) is fixedly 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). The dynamometer component (7) is used to detect the power of the engine.

2. The test device for diesel engine maintenance with a working 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, and regulating valves are provided in both the water inlet component (4) and the water outlet component (5). The regulating valves are used to adjust the load of the hydraulic dynamometer.

3. The test device for diesel engine maintenance with a working condition simulation function according to claim 2, characterized in that: The body component (6) includes a housing (61), 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 drivingly connected to the coupling (2), the rotor (64) is fixedly connected to the rotating shaft (63), and several rotors (64) are provided on the rotating shaft (63). The several rotors (64) rotate freely within the housing (61). The housing (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).

4. A test device for diesel engine maintenance with a working condition simulation function according to claim 3, characterized in that: A cooling inlet (613) and a cooling outlet (614) are provided within the housing (61), the cooling inlet (613) and the cooling outlet (614) are externally connected to a cooling water source, and an arc-shaped groove (615) is further provided within the housing (61). A temperature control component (8) is provided within the arc-shaped groove (615), and the temperature control component (8) can automatically adjust the cooling effect according to the load.

5. The test device for diesel engine maintenance with a working condition simulation function according to claim 4, characterized in that: The temperature control component (8) includes an arc-shaped slider (81) and a support spring (82). The arc-shaped slider (81) is slidably connected to the arc-shaped groove (615), a displacement sensor is integrated within the arc-shaped slider (81), one end of the support spring (82) is fixedly connected to the arc-shaped slider (81), and the other end of the support spring (82) is fixedly connected to the inner wall of the arc-shaped groove (615).

6. The test device for diesel engine maintenance with a working condition simulation function according to claim 5, characterized in that: A flow blocking groove (811) is provided on the arc-shaped slider (81), and the flow blocking groove (811) faces the rotor (64).

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

8. The test device for diesel engine maintenance with a working condition simulation function according to claim 7, characterized in that: The cooling flow channel (812) is provided with a first inlet (8121) and a first outlet (8122), and the connections between the first inlet (8121) and the cooling inlet (613) and between the first outlet (8122) and the cooling outlet (614) are arranged in a staggered manner.

9. The test device for diesel engine maintenance with a working condition simulation function according to claim 3, characterized in that: The dynamometer component (7) includes a brake arm (71), a tension and compression sensor (72), a support base (73), and a protective cover (74). The brake arm (71) is connected to the outer shell (61) by bolts; the protective cover (74) is fixedly connected to the base (3), the support base (73) is fixedly connected to the base (3), one end of the tension and compression sensor (72) is hinged to the brake arm (71), and the other end of the tension and compression sensor (72) is hinged to the support base (73).

10. The test device for diesel engine maintenance with a working condition simulation function according to claim 6, characterized in that: The flow blocking groove (811) is arranged obliquely, and the inclination direction of the flow blocking groove (811) is opposite to the rotation direction of the rotor (64).

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