Performance testing device for servo oil supercharged ejector

Abstract

The utility model provides a servo oil supercharged injector performance testing device, which solves the problem that the servo oil supercharged injector performance testing device cannot be suitable for performance testing of various new fuel injection systems, realizes effective inspection of injection rules and verification of system performance, and further provides guarantee for follow-up development of new fuel engines.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of injector, specifically relates to a servo oil pressurization type injector performance testing device. BACKGROUND

[0002] The development of the injector is one of the most core key technologies for developing the engine, the simple performance testing system suitable for the servo oil pressurization type injector injection system is helpful to analyze the injection law and various influence factors, verify the performance of the newly developed engine fuel supply system, check the rationality of various design and control parameters, and is a necessary step before the engine is ignited.

[0003] And the traditional diesel engine injection system test bench cannot be applied to the performance testing of various new fuel injection systems, and there is no testing system with high detection precision and applicable to the injection law of different characteristic fuel high-power engines on the market. UTILITY MODEL CONTENTS

[0004] The utility model technical scheme aims at providing a servo oil pressurization type injector performance testing device universally applicable to various fuels, so as to effectively test the injection law and verify the system performance, and further provide guarantee for the subsequent development of new fuel engines.

[0005] The utility model technical scheme provides a servo oil pressurization type injector performance testing device, which comprises:

[0006] The servo oil tank 1, the servo oil filter 2, the servo oil pressurizing pump 3, the servo oil pressure stabilizing tank 4 and the servo oil control valve 5 are sequentially connected, and the servo oil control valve 5 is connected with the injector 16 through a pipeline;

[0007] The fuel tank 6, the fuel filter 7, the fuel pressurizing pump 8, the fuel pressure stabilizing tank 9, the adjusting valve 10, the heat exchanger 11, the three-way valve 12, the first DBB valve 13 and the first air vent valve 14 are connected with the injector 16 through a pipeline, and the pipeline, in which the first air vent valve 14 is connected with the injector 16, is provided with the first hydrocarbon sensor 15;

[0008] The injector 16 is partially inserted into the fuel pressure measuring chamber 17, and the fuel pressure measuring chamber 17, the safety protection valve 20, the pressure regulating valve 21, the back pressure valve 22, the second air vent valve 23, the fuel recovery tank 24 and the pressure relief valve 25 are sequentially connected, the injector 16 is connected to the fuel recovery tank 24 through the second DBB valve 26 and the opening adjustable valve 27 respectively, the fuel pressure measuring chamber 17 is provided with the P / T sensor 18, and the pipeline, in which the fuel pressure measuring chamber 17 is connected with the safety protection valve 20, is provided with the second hydrocarbon sensor 19;

[0009] The fuel pressure chamber 17 is connected to the charge amplifier 28. The charge amplifier 28, the data acquisition card 29, the computer 31 and the control circuit 30 are connected in sequence. The control circuit 30 is connected to the servo oil control valve 5 and the injector 16 respectively.

[0010] Preferably, a first temperature detector is provided in the pipeline connecting the regulating valve 10 and the heat exchanger 11, and a second temperature detector is provided in the pipeline connecting the heat exchanger 11 and the three-way valve 12.

[0011] Preferably, the pipelines connecting the three-way valve 12, the first DBB valve 13, and the first vent valve 14 to the injector 16 are double-walled pipes, the pipeline connecting the servo oil control valve 5 to the injector 16 is a double-walled pipe, and the pipeline connecting the injector 16 to the fuel recovery tank 24 via the second DBB valve 26 is a double-walled pipe.

[0012] Preferably, the double-walled pipe includes an outer pipe 35, an inner pipe 36, and a bushing 37. The bushing 37 is located at the joint of the double-walled pipe and has a flow gap in the middle.

[0013] Preferably, carbon and nitrogen are drawn into the outer tube 35 and transferred to the first hydrocarbon sensor 15 and the second hydrocarbon sensor 19.

[0014] Preferably, a first nitrogen purge port 32 is provided between the fuel pressure stabilizing tank 9 and the regulating valve 10, a second nitrogen purge port 33 is provided between the first DBB valve 13 and the injector 16, and a third nitrogen purge port 34 is provided in the fuel pressure measuring chamber 17.

[0015] This utility model proposes a performance testing device for a servo oil booster injector, which solves the problem of performance testing that is not applicable to various new fuel injection systems. It enables effective verification of injection patterns and system performance, thereby providing a guarantee for the subsequent development of new fuel engines. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a servo oil booster injector performance testing device provided by this utility model;

[0017] Figure 2 A schematic diagram of the double-walled tube structure provided by this utility model;

[0018] Figure label:

[0019] Servo oil tank 1, servo oil filter 2, servo oil pressurizing pump 3, servo oil pressure stabilizing tank 4;

[0020] 5. Servo oil control valve; 6. Fuel tank; 7. Fuel filter; 8. Fuel pressurization pump;

[0021] 9. Fuel pressure stabilizing tank; 10. Regulating valve; 11. Heat exchanger; 12. Three-way valve; 13. First DBB valve;

[0022] First vent valve 14, first hydrocarbon sensor 15, injector 16, fuel pressure chamber 17;

[0023] P / T sensor 18, second hydrocarbon sensor 19, safety protection valve 20, pressure regulating valve 21;

[0024] Back pressure valve 22, second vent valve 23, fuel recovery tank 24, pressure relief valve 25, second DBB valve 26;

[0025] 27. Adjustable valve opening; 28. Charge amplifier; 29. ​​Data acquisition card; 30. Control circuit.

[0026] Computer 31, First nitrogen purging inlet 32, Second nitrogen purging inlet 33;

[0027] The third nitrogen purging inlet is 34, the outer pipe is 35, the inner pipe is 36, and the bushing is 37. Detailed Implementation

[0028] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0029] The servo-oil booster injector performance testing system mainly consists of five subsystems: a servo-oil system, a fuel supply system, a nitrogen purging system, an injection pattern testing system, and a control system. These components are connected via pipes or wiring: the servo-oil system and fuel supply system are connected to the injector via pipes; the nitrogen purging system consists of three separate nitrogen purging inlets; the injection pattern testing system is directly connected to the injector; and the control system is connected to the injector via data and control signals. Employing a modular design, its main function is to test the injection pattern of the fuel injection system and to provide preliminary verification of nozzle reliability.

[0030] like Figure 1The diagram shows the overall principle of the servo oil booster injector performance testing system, which includes five systems: servo oil system, fuel supply system, nitrogen purging system, injection pattern testing system, and control system. The servo oil system mainly consists of a servo oil tank 1, a servo oil filter 2, a servo oil booster pump 3, a servo oil pressure stabilizing tank 4, and a servo oil control valve 5. The fuel supply system comprises a fuel tank 6, a fuel filter 7, a fuel booster pump 8, a fuel pressure stabilizing tank 9, a regulating valve 10, a heat exchanger 11, and a three-way valve 12. The fuel supply system is connected to the injector 16 via a first DBB valve 13 and a first vent valve 14, and a first hydrocarbon sensor 15 is installed in the intermediate pipeline. The injection pattern testing system includes a fuel pressure measuring chamber 17 and a P / T transmission... The system includes a sensor 18, a second hydrocarbon sensor 19, a safety protection valve 20, a pressure regulating valve 21, a back pressure valve 22, a second vent valve 23, a fuel recovery tank 24, and a pressure relief valve 25. The injector 16 is connected to the fuel recovery tank 24 via a second DBB valve 26 and an adjustable valve 27. The control system consists of a charge amplifier 28, a data acquisition card 29, a control circuit 30, and a computer 31. The nitrogen purging system includes a first nitrogen purging inlet 32, a second nitrogen purging inlet 33, and a third nitrogen purging inlet 34.

[0031] Overall, the system consists of two lines: servo oil and fuel. Pressurized fuel at a stable pressure is fed into the injectors separately, and then returned to the recovery tanks. The injectors are directly connected to the fuel pressure testing chamber and are connected to a computer via control circuitry and a data acquisition card for testing. The entire pipeline is purged with nitrogen.

[0032] 1. Servo oil system:

[0033] The servo oil in the servo oil tank is filtered by a filter and then pressurized to the required pressure by a booster pump. After entering the servo oil pressure stabilizing tank, the servo oil at the target pressure is delivered to the servo oil control valve and the injector. At the outlet, the oil returns through a check valve. Since the injector is mechanical, the servo oil control valve controls the opening time and injection duration of the servo oil.

[0034] 2. Fuel supply system:

[0035] After being filtered by the filter, the fuel is pressurized to the target pressure by a pressurizing pump, then connected to a fuel pressure stabilizing tank. The fuel, after its temperature is adjusted by a temperature control system, is then fed into the injector in the fuel injection system and finally returned to the fuel storage tank.

[0036] After the fuel is pressurized by the pump, its temperature changes. To obtain fuel at the target temperature, temperature regulation is required. The specific operation is as follows: A temperature regulation system is connected after the pump. The temperature regulation system consists of two parallel circuits: one for heating and the other for heat exchange. Each circuit is equipped with corresponding valves to adjust the fuel temperature according to the season or as needed. The fuel is then mixed with the temperature-regulated fuel to obtain fuel at the appropriate temperature, which is then fed into the injector system.

[0037] The injector is directly inserted into the fuel pressure chamber. A return path (second DBB valve 26) is provided to the fuel recovery tank to recover waste liquid / gas from the injector. A safety valve is installed after the injector for emergency shut-off in case of safety issues.

[0038] After passing through the injector, the fuel flows through a pressure regulating valve and a back pressure valve (the back pressure valve pressure is set as needed), with one end connected to the fuel recovery tank and the other end used for venting, allowing gas to escape into the atmosphere. This is because after nitrogen purges the fuel in the pipeline to the recovery tank, excess nitrogen in the pipeline can be released into the atmosphere through this valve. The fuel recovery tank needs to be equipped with a pressure relief valve. If the tank pressure is too high, the pressure is relieved through the pressure relief valve. To prevent fuel from being discharged during the pressure relief process, the upper layer of the fuel recovery tank is sealed with nitrogen. The specific operation is as follows: the fuel recovery tank is connected to the pressure relief valve. When the pressure inside the tank reaches the valve's opening pressure, nitrogen will be forced out, thus ensuring that the pressure inside the fuel tank remains within the set safe pressure range.

[0039] From the inlet pipe to the fuel recovery tank, all intermediate pipes are double-walled. The specific structure of the double-walled pipe is as follows: Figure 2 As shown, the system includes an outer pipe 35, an inner pipe 36, and a bushing 37. The bushing 37 is installed at the pipe joint, but it does not completely cover the joint, leaving a certain space for flow. In addition, hydrocarbons are drawn from the outer pipe 35 of the two double-walled pipes that enter and exit the injector, and connected to the first hydrocarbon sensor 15 and the second hydrocarbon sensor 19 to detect whether there is a fuel leak.

[0040] 3. Nitrogen purging system:

[0041] Purge the entire pipeline with nitrogen gas at a pressure at least 7 bar higher than the supply pressure to ensure complete purging. The specific procedure is as follows:

[0042] A first nitrogen purging port 33 is installed on the pipeline after the fuel pressure tank to purge the fuel temperature control system. During purging, the first DBB valve 13 is closed and the vent valve is opened to release nitrogen.

[0043] A second nitrogen purging port 34 is provided at the front end of the injector, and the first DBB valve 13 is closed during purging. Since the injector pipeline is relatively narrow, in order to ensure complete purging of the subsequent pipeline, an adjustable valve 27 is provided between the injector and the fuel recovery tank. It is only opened during nitrogen purging to ensure that the nitrogen after purging the injector can enter the fuel recovery tank.

[0044] A third nitrogen purging port 35 is installed at the fuel pressure testing chamber to ensure that a sufficiently large flow of nitrogen is purged to the subsequent pipelines.

[0045] At this point, the purging of all pipelines is complete.

[0046] 4. Jet pattern testing system:

[0047] The specific working principle of the fuel pressure chamber is as follows: fuel is injected into a sealed rigid container filled with fuel oil, and the pressure increases proportionally with the injection volume. The injection pattern and injection volume can be calculated based on the pressure curve.

[0048] When a sealed container has a volume of V and a fuel injection volume of ΔV is applied, and the bulk modulus of the fuel is K, the pressure rise ΔP in the rigid sealed container can be expressed as: ΔP = K * ΔV / V. Taking the derivative with respect to time, we get: dP / dt = K * V * dV / dt.

[0049] The injection rate can be obtained:

[0050] dV / dt=K*V*dP / dt

[0051] dP / dt can be obtained from a fast-response pressure sensor.

[0052] 5. Control system:

[0053] The signals from the servo oil control valve and injector are directly connected to the control circuit, and the fuel pressure test chamber is connected to a charge amplifier so that data can be acquired using a data acquisition card.

Claims

1. A performance testing device for a servo oil booster injector, characterized in that, include: Servo oil tank (1), servo oil filter (2), servo oil pressurizing pump (3), servo oil pressure stabilizing tank (4), and servo oil control valve (5) are connected in sequence. The servo oil control valve (5) is connected to the injector (16) through a pipeline. Fuel tank (6), fuel filter (7), fuel pressurization pump (8), fuel pressure stabilizing tank (9), regulating valve (10), heat exchanger (11), three-way valve (12), first DBB valve (13), first vent valve (14) are connected to injector (16) through pipelines. A first hydrocarbon sensor (15) is provided in the pipeline connecting the first vent valve (14) and injector (16). The injector (16) is partially inserted into the fuel pressure chamber (17). The fuel pressure chamber (17), safety protection valve (20), pressure regulating valve (21), back pressure valve (22), second vent valve (23), fuel recovery tank (24), and pressure relief valve (25) are connected in sequence. The injector (16) is connected to the fuel recovery tank (24) through the second DBB valve (26) and the adjustable valve (27). The fuel pressure chamber (17) is equipped with a P / T sensor (18). The pipeline connecting the fuel pressure chamber (17) and the safety protection valve (20) is equipped with a second hydrocarbon sensor (19). The fuel pressure chamber (17) is connected to the charge amplifier (28). The charge amplifier (28), data acquisition card (29), computer (31) and control circuit (30) are connected in sequence. The control circuit (30) is connected to the servo oil control valve (5) and injector (16) respectively.

2. The servo oil booster injector performance testing device as described in claim 1, characterized in that, A first temperature detector is provided in the pipeline connecting the regulating valve (10) and the heat exchanger (11), and a second temperature detector is provided in the pipeline connecting the heat exchanger (11) and the three-way valve (12).

3. The servo oil booster injector performance testing device as described in claim 1, characterized in that, The pipelines connecting the three-way valve (12), the first DBB valve (13) and the first vent valve (14) to the injector (16) are double-walled pipes. The pipeline connecting the servo oil control valve (5) to the injector (16) is a double-walled pipe. The pipeline connecting the injector (16) to the fuel recovery tank (24) through the second DBB valve (26) is a double-walled pipe.

4. The servo oil booster injector performance testing device as described in claim 3, characterized in that, The double-walled pipe includes an outer pipe (35), an inner pipe (36), and a bushing (37). The bushing (37) is located at the joint of the double-walled pipe and has a flow gap in the middle.

5. The servo oil booster injector performance testing device as described in claim 4, characterized in that, Carbon and nitrogen are drawn into the outer tube (35) and transferred to the first hydrocarbon sensor (15) and the second hydrocarbon sensor (19).

6. The servo oil booster injector performance testing device as described in claim 1, characterized in that, A first nitrogen purge port (32) is provided between the fuel pressure stabilizing tank (9) and the regulating valve (10), a second nitrogen purge port (33) is provided between the first DBB valve (13) and the injector (16), and a third nitrogen purge port (34) is provided in the fuel pressure measuring chamber (17).

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